forked from KolibriOS/kolibrios
2076 lines
82 KiB
C
2076 lines
82 KiB
C
/*
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* Windows Media Audio Voice decoder.
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* Copyright (c) 2009 Ronald S. Bultje
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* @brief Windows Media Audio Voice compatible decoder
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* @author Ronald S. Bultje <rsbultje@gmail.com>
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*/
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#include <math.h>
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#include "libavutil/channel_layout.h"
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#include "libavutil/float_dsp.h"
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#include "libavutil/mem.h"
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#include "avcodec.h"
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#include "internal.h"
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#include "get_bits.h"
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#include "put_bits.h"
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#include "wmavoice_data.h"
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#include "celp_filters.h"
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#include "acelp_vectors.h"
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#include "acelp_filters.h"
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#include "lsp.h"
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#include "dct.h"
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#include "rdft.h"
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#include "sinewin.h"
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#define MAX_BLOCKS 8 ///< maximum number of blocks per frame
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#define MAX_LSPS 16 ///< maximum filter order
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#define MAX_LSPS_ALIGN16 16 ///< same as #MAX_LSPS; needs to be multiple
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///< of 16 for ASM input buffer alignment
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#define MAX_FRAMES 3 ///< maximum number of frames per superframe
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#define MAX_FRAMESIZE 160 ///< maximum number of samples per frame
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#define MAX_SIGNAL_HISTORY 416 ///< maximum excitation signal history
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#define MAX_SFRAMESIZE (MAX_FRAMESIZE * MAX_FRAMES)
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///< maximum number of samples per superframe
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#define SFRAME_CACHE_MAXSIZE 256 ///< maximum cache size for frame data that
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///< was split over two packets
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#define VLC_NBITS 6 ///< number of bits to read per VLC iteration
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/**
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* Frame type VLC coding.
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*/
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static VLC frame_type_vlc;
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/**
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* Adaptive codebook types.
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*/
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enum {
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ACB_TYPE_NONE = 0, ///< no adaptive codebook (only hardcoded fixed)
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ACB_TYPE_ASYMMETRIC = 1, ///< adaptive codebook with per-frame pitch, which
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///< we interpolate to get a per-sample pitch.
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///< Signal is generated using an asymmetric sinc
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///< window function
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///< @note see #wmavoice_ipol1_coeffs
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ACB_TYPE_HAMMING = 2 ///< Per-block pitch with signal generation using
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///< a Hamming sinc window function
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///< @note see #wmavoice_ipol2_coeffs
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};
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/**
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* Fixed codebook types.
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*/
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enum {
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FCB_TYPE_SILENCE = 0, ///< comfort noise during silence
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///< generated from a hardcoded (fixed) codebook
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///< with per-frame (low) gain values
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FCB_TYPE_HARDCODED = 1, ///< hardcoded (fixed) codebook with per-block
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///< gain values
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FCB_TYPE_AW_PULSES = 2, ///< Pitch-adaptive window (AW) pulse signals,
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///< used in particular for low-bitrate streams
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FCB_TYPE_EXC_PULSES = 3, ///< Innovation (fixed) codebook pulse sets in
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///< combinations of either single pulses or
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///< pulse pairs
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};
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/**
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* Description of frame types.
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*/
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static const struct frame_type_desc {
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uint8_t n_blocks; ///< amount of blocks per frame (each block
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///< (contains 160/#n_blocks samples)
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uint8_t log_n_blocks; ///< log2(#n_blocks)
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uint8_t acb_type; ///< Adaptive codebook type (ACB_TYPE_*)
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uint8_t fcb_type; ///< Fixed codebook type (FCB_TYPE_*)
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uint8_t dbl_pulses; ///< how many pulse vectors have pulse pairs
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///< (rather than just one single pulse)
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///< only if #fcb_type == #FCB_TYPE_EXC_PULSES
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uint16_t frame_size; ///< the amount of bits that make up the block
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///< data (per frame)
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} frame_descs[17] = {
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{ 1, 0, ACB_TYPE_NONE, FCB_TYPE_SILENCE, 0, 0 },
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{ 2, 1, ACB_TYPE_NONE, FCB_TYPE_HARDCODED, 0, 28 },
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{ 2, 1, ACB_TYPE_ASYMMETRIC, FCB_TYPE_AW_PULSES, 0, 46 },
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{ 2, 1, ACB_TYPE_ASYMMETRIC, FCB_TYPE_EXC_PULSES, 2, 80 },
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{ 2, 1, ACB_TYPE_ASYMMETRIC, FCB_TYPE_EXC_PULSES, 5, 104 },
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{ 4, 2, ACB_TYPE_ASYMMETRIC, FCB_TYPE_EXC_PULSES, 0, 108 },
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{ 4, 2, ACB_TYPE_ASYMMETRIC, FCB_TYPE_EXC_PULSES, 2, 132 },
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{ 4, 2, ACB_TYPE_ASYMMETRIC, FCB_TYPE_EXC_PULSES, 5, 168 },
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{ 2, 1, ACB_TYPE_HAMMING, FCB_TYPE_EXC_PULSES, 0, 64 },
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{ 2, 1, ACB_TYPE_HAMMING, FCB_TYPE_EXC_PULSES, 2, 80 },
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{ 2, 1, ACB_TYPE_HAMMING, FCB_TYPE_EXC_PULSES, 5, 104 },
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{ 4, 2, ACB_TYPE_HAMMING, FCB_TYPE_EXC_PULSES, 0, 108 },
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{ 4, 2, ACB_TYPE_HAMMING, FCB_TYPE_EXC_PULSES, 2, 132 },
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{ 4, 2, ACB_TYPE_HAMMING, FCB_TYPE_EXC_PULSES, 5, 168 },
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{ 8, 3, ACB_TYPE_HAMMING, FCB_TYPE_EXC_PULSES, 0, 176 },
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{ 8, 3, ACB_TYPE_HAMMING, FCB_TYPE_EXC_PULSES, 2, 208 },
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{ 8, 3, ACB_TYPE_HAMMING, FCB_TYPE_EXC_PULSES, 5, 256 }
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};
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/**
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* WMA Voice decoding context.
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*/
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typedef struct {
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/**
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* @name Global values specified in the stream header / extradata or used all over.
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* @{
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*/
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GetBitContext gb; ///< packet bitreader. During decoder init,
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///< it contains the extradata from the
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///< demuxer. During decoding, it contains
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///< packet data.
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int8_t vbm_tree[25]; ///< converts VLC codes to frame type
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int spillover_bitsize; ///< number of bits used to specify
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///< #spillover_nbits in the packet header
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///< = ceil(log2(ctx->block_align << 3))
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int history_nsamples; ///< number of samples in history for signal
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///< prediction (through ACB)
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/* postfilter specific values */
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int do_apf; ///< whether to apply the averaged
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///< projection filter (APF)
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int denoise_strength; ///< strength of denoising in Wiener filter
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///< [0-11]
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int denoise_tilt_corr; ///< Whether to apply tilt correction to the
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///< Wiener filter coefficients (postfilter)
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int dc_level; ///< Predicted amount of DC noise, based
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///< on which a DC removal filter is used
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int lsps; ///< number of LSPs per frame [10 or 16]
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int lsp_q_mode; ///< defines quantizer defaults [0, 1]
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int lsp_def_mode; ///< defines different sets of LSP defaults
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///< [0, 1]
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int frame_lsp_bitsize; ///< size (in bits) of LSPs, when encoded
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///< per-frame (independent coding)
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int sframe_lsp_bitsize; ///< size (in bits) of LSPs, when encoded
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///< per superframe (residual coding)
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int min_pitch_val; ///< base value for pitch parsing code
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int max_pitch_val; ///< max value + 1 for pitch parsing
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int pitch_nbits; ///< number of bits used to specify the
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///< pitch value in the frame header
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int block_pitch_nbits; ///< number of bits used to specify the
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///< first block's pitch value
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int block_pitch_range; ///< range of the block pitch
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int block_delta_pitch_nbits; ///< number of bits used to specify the
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///< delta pitch between this and the last
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///< block's pitch value, used in all but
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///< first block
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int block_delta_pitch_hrange; ///< 1/2 range of the delta (full range is
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///< from -this to +this-1)
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uint16_t block_conv_table[4]; ///< boundaries for block pitch unit/scale
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///< conversion
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/**
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* @}
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*
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* @name Packet values specified in the packet header or related to a packet.
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*
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* A packet is considered to be a single unit of data provided to this
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* decoder by the demuxer.
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* @{
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*/
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int spillover_nbits; ///< number of bits of the previous packet's
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///< last superframe preceding this
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///< packet's first full superframe (useful
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///< for re-synchronization also)
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int has_residual_lsps; ///< if set, superframes contain one set of
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///< LSPs that cover all frames, encoded as
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///< independent and residual LSPs; if not
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///< set, each frame contains its own, fully
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///< independent, LSPs
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int skip_bits_next; ///< number of bits to skip at the next call
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///< to #wmavoice_decode_packet() (since
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///< they're part of the previous superframe)
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uint8_t sframe_cache[SFRAME_CACHE_MAXSIZE + FF_INPUT_BUFFER_PADDING_SIZE];
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///< cache for superframe data split over
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///< multiple packets
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int sframe_cache_size; ///< set to >0 if we have data from an
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///< (incomplete) superframe from a previous
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///< packet that spilled over in the current
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///< packet; specifies the amount of bits in
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///< #sframe_cache
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PutBitContext pb; ///< bitstream writer for #sframe_cache
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/**
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* @}
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*
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* @name Frame and superframe values
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* Superframe and frame data - these can change from frame to frame,
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* although some of them do in that case serve as a cache / history for
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* the next frame or superframe.
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* @{
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*/
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double prev_lsps[MAX_LSPS]; ///< LSPs of the last frame of the previous
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///< superframe
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int last_pitch_val; ///< pitch value of the previous frame
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int last_acb_type; ///< frame type [0-2] of the previous frame
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int pitch_diff_sh16; ///< ((cur_pitch_val - #last_pitch_val)
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///< << 16) / #MAX_FRAMESIZE
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float silence_gain; ///< set for use in blocks if #ACB_TYPE_NONE
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int aw_idx_is_ext; ///< whether the AW index was encoded in
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///< 8 bits (instead of 6)
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int aw_pulse_range; ///< the range over which #aw_pulse_set1()
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///< can apply the pulse, relative to the
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///< value in aw_first_pulse_off. The exact
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///< position of the first AW-pulse is within
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///< [pulse_off, pulse_off + this], and
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///< depends on bitstream values; [16 or 24]
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int aw_n_pulses[2]; ///< number of AW-pulses in each block; note
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///< that this number can be negative (in
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///< which case it basically means "zero")
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int aw_first_pulse_off[2]; ///< index of first sample to which to
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///< apply AW-pulses, or -0xff if unset
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int aw_next_pulse_off_cache; ///< the position (relative to start of the
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///< second block) at which pulses should
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///< start to be positioned, serves as a
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///< cache for pitch-adaptive window pulses
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///< between blocks
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int frame_cntr; ///< current frame index [0 - 0xFFFE]; is
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///< only used for comfort noise in #pRNG()
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float gain_pred_err[6]; ///< cache for gain prediction
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float excitation_history[MAX_SIGNAL_HISTORY];
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///< cache of the signal of previous
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///< superframes, used as a history for
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///< signal generation
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float synth_history[MAX_LSPS]; ///< see #excitation_history
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/**
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* @}
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*
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* @name Postfilter values
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*
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* Variables used for postfilter implementation, mostly history for
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* smoothing and so on, and context variables for FFT/iFFT.
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* @{
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*/
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RDFTContext rdft, irdft; ///< contexts for FFT-calculation in the
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///< postfilter (for denoise filter)
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DCTContext dct, dst; ///< contexts for phase shift (in Hilbert
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///< transform, part of postfilter)
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float sin[511], cos[511]; ///< 8-bit cosine/sine windows over [-pi,pi]
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///< range
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float postfilter_agc; ///< gain control memory, used in
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///< #adaptive_gain_control()
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float dcf_mem[2]; ///< DC filter history
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float zero_exc_pf[MAX_SIGNAL_HISTORY + MAX_SFRAMESIZE];
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///< zero filter output (i.e. excitation)
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///< by postfilter
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float denoise_filter_cache[MAX_FRAMESIZE];
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int denoise_filter_cache_size; ///< samples in #denoise_filter_cache
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DECLARE_ALIGNED(32, float, tilted_lpcs_pf)[0x80];
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///< aligned buffer for LPC tilting
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DECLARE_ALIGNED(32, float, denoise_coeffs_pf)[0x80];
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///< aligned buffer for denoise coefficients
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DECLARE_ALIGNED(32, float, synth_filter_out_buf)[0x80 + MAX_LSPS_ALIGN16];
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///< aligned buffer for postfilter speech
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///< synthesis
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/**
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* @}
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*/
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} WMAVoiceContext;
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/**
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* Set up the variable bit mode (VBM) tree from container extradata.
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* @param gb bit I/O context.
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* The bit context (s->gb) should be loaded with byte 23-46 of the
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* container extradata (i.e. the ones containing the VBM tree).
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* @param vbm_tree pointer to array to which the decoded VBM tree will be
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* written.
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* @return 0 on success, <0 on error.
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*/
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static av_cold int decode_vbmtree(GetBitContext *gb, int8_t vbm_tree[25])
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{
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int cntr[8] = { 0 }, n, res;
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memset(vbm_tree, 0xff, sizeof(vbm_tree[0]) * 25);
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for (n = 0; n < 17; n++) {
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res = get_bits(gb, 3);
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if (cntr[res] > 3) // should be >= 3 + (res == 7))
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return -1;
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vbm_tree[res * 3 + cntr[res]++] = n;
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}
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return 0;
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}
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static av_cold void wmavoice_init_static_data(AVCodec *codec)
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{
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static const uint8_t bits[] = {
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2, 2, 2, 4, 4, 4,
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6, 6, 6, 8, 8, 8,
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10, 10, 10, 12, 12, 12,
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14, 14, 14, 14
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};
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static const uint16_t codes[] = {
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0x0000, 0x0001, 0x0002, // 00/01/10
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0x000c, 0x000d, 0x000e, // 11+00/01/10
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0x003c, 0x003d, 0x003e, // 1111+00/01/10
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0x00fc, 0x00fd, 0x00fe, // 111111+00/01/10
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0x03fc, 0x03fd, 0x03fe, // 11111111+00/01/10
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0x0ffc, 0x0ffd, 0x0ffe, // 1111111111+00/01/10
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0x3ffc, 0x3ffd, 0x3ffe, 0x3fff // 111111111111+xx
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};
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INIT_VLC_STATIC(&frame_type_vlc, VLC_NBITS, sizeof(bits),
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bits, 1, 1, codes, 2, 2, 132);
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}
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/**
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* Set up decoder with parameters from demuxer (extradata etc.).
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*/
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static av_cold int wmavoice_decode_init(AVCodecContext *ctx)
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{
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int n, flags, pitch_range, lsp16_flag;
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WMAVoiceContext *s = ctx->priv_data;
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/**
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* Extradata layout:
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* - byte 0-18: WMAPro-in-WMAVoice extradata (see wmaprodec.c),
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* - byte 19-22: flags field (annoyingly in LE; see below for known
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* values),
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* - byte 23-46: variable bitmode tree (really just 17 * 3 bits,
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* rest is 0).
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*/
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if (ctx->extradata_size != 46) {
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av_log(ctx, AV_LOG_ERROR,
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"Invalid extradata size %d (should be 46)\n",
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ctx->extradata_size);
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return AVERROR_INVALIDDATA;
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}
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flags = AV_RL32(ctx->extradata + 18);
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s->spillover_bitsize = 3 + av_ceil_log2(ctx->block_align);
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s->do_apf = flags & 0x1;
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if (s->do_apf) {
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ff_rdft_init(&s->rdft, 7, DFT_R2C);
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ff_rdft_init(&s->irdft, 7, IDFT_C2R);
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ff_dct_init(&s->dct, 6, DCT_I);
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ff_dct_init(&s->dst, 6, DST_I);
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ff_sine_window_init(s->cos, 256);
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memcpy(&s->sin[255], s->cos, 256 * sizeof(s->cos[0]));
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for (n = 0; n < 255; n++) {
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s->sin[n] = -s->sin[510 - n];
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s->cos[510 - n] = s->cos[n];
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}
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}
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s->denoise_strength = (flags >> 2) & 0xF;
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if (s->denoise_strength >= 12) {
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av_log(ctx, AV_LOG_ERROR,
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"Invalid denoise filter strength %d (max=11)\n",
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s->denoise_strength);
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return AVERROR_INVALIDDATA;
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}
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s->denoise_tilt_corr = !!(flags & 0x40);
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s->dc_level = (flags >> 7) & 0xF;
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s->lsp_q_mode = !!(flags & 0x2000);
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s->lsp_def_mode = !!(flags & 0x4000);
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lsp16_flag = flags & 0x1000;
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if (lsp16_flag) {
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s->lsps = 16;
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s->frame_lsp_bitsize = 34;
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s->sframe_lsp_bitsize = 60;
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} else {
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s->lsps = 10;
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s->frame_lsp_bitsize = 24;
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s->sframe_lsp_bitsize = 48;
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}
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for (n = 0; n < s->lsps; n++)
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s->prev_lsps[n] = M_PI * (n + 1.0) / (s->lsps + 1.0);
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init_get_bits(&s->gb, ctx->extradata + 22, (ctx->extradata_size - 22) << 3);
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if (decode_vbmtree(&s->gb, s->vbm_tree) < 0) {
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av_log(ctx, AV_LOG_ERROR, "Invalid VBM tree; broken extradata?\n");
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return AVERROR_INVALIDDATA;
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}
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s->min_pitch_val = ((ctx->sample_rate << 8) / 400 + 50) >> 8;
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s->max_pitch_val = ((ctx->sample_rate << 8) * 37 / 2000 + 50) >> 8;
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pitch_range = s->max_pitch_val - s->min_pitch_val;
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if (pitch_range <= 0) {
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av_log(ctx, AV_LOG_ERROR, "Invalid pitch range; broken extradata?\n");
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return AVERROR_INVALIDDATA;
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}
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s->pitch_nbits = av_ceil_log2(pitch_range);
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s->last_pitch_val = 40;
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s->last_acb_type = ACB_TYPE_NONE;
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s->history_nsamples = s->max_pitch_val + 8;
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|
|
if (s->min_pitch_val < 1 || s->history_nsamples > MAX_SIGNAL_HISTORY) {
|
|
int min_sr = ((((1 << 8) - 50) * 400) + 0xFF) >> 8,
|
|
max_sr = ((((MAX_SIGNAL_HISTORY - 8) << 8) + 205) * 2000 / 37) >> 8;
|
|
|
|
av_log(ctx, AV_LOG_ERROR,
|
|
"Unsupported samplerate %d (min=%d, max=%d)\n",
|
|
ctx->sample_rate, min_sr, max_sr); // 322-22097 Hz
|
|
|
|
return AVERROR(ENOSYS);
|
|
}
|
|
|
|
s->block_conv_table[0] = s->min_pitch_val;
|
|
s->block_conv_table[1] = (pitch_range * 25) >> 6;
|
|
s->block_conv_table[2] = (pitch_range * 44) >> 6;
|
|
s->block_conv_table[3] = s->max_pitch_val - 1;
|
|
s->block_delta_pitch_hrange = (pitch_range >> 3) & ~0xF;
|
|
if (s->block_delta_pitch_hrange <= 0) {
|
|
av_log(ctx, AV_LOG_ERROR, "Invalid delta pitch hrange; broken extradata?\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
s->block_delta_pitch_nbits = 1 + av_ceil_log2(s->block_delta_pitch_hrange);
|
|
s->block_pitch_range = s->block_conv_table[2] +
|
|
s->block_conv_table[3] + 1 +
|
|
2 * (s->block_conv_table[1] - 2 * s->min_pitch_val);
|
|
s->block_pitch_nbits = av_ceil_log2(s->block_pitch_range);
|
|
|
|
ctx->channels = 1;
|
|
ctx->channel_layout = AV_CH_LAYOUT_MONO;
|
|
ctx->sample_fmt = AV_SAMPLE_FMT_FLT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* @name Postfilter functions
|
|
* Postfilter functions (gain control, wiener denoise filter, DC filter,
|
|
* kalman smoothening, plus surrounding code to wrap it)
|
|
* @{
|
|
*/
|
|
/**
|
|
* Adaptive gain control (as used in postfilter).
|
|
*
|
|
* Identical to #ff_adaptive_gain_control() in acelp_vectors.c, except
|
|
* that the energy here is calculated using sum(abs(...)), whereas the
|
|
* other codecs (e.g. AMR-NB, SIPRO) use sqrt(dotproduct(...)).
|
|
*
|
|
* @param out output buffer for filtered samples
|
|
* @param in input buffer containing the samples as they are after the
|
|
* postfilter steps so far
|
|
* @param speech_synth input buffer containing speech synth before postfilter
|
|
* @param size input buffer size
|
|
* @param alpha exponential filter factor
|
|
* @param gain_mem pointer to filter memory (single float)
|
|
*/
|
|
static void adaptive_gain_control(float *out, const float *in,
|
|
const float *speech_synth,
|
|
int size, float alpha, float *gain_mem)
|
|
{
|
|
int i;
|
|
float speech_energy = 0.0, postfilter_energy = 0.0, gain_scale_factor;
|
|
float mem = *gain_mem;
|
|
|
|
for (i = 0; i < size; i++) {
|
|
speech_energy += fabsf(speech_synth[i]);
|
|
postfilter_energy += fabsf(in[i]);
|
|
}
|
|
gain_scale_factor = (1.0 - alpha) * speech_energy / postfilter_energy;
|
|
|
|
for (i = 0; i < size; i++) {
|
|
mem = alpha * mem + gain_scale_factor;
|
|
out[i] = in[i] * mem;
|
|
}
|
|
|
|
*gain_mem = mem;
|
|
}
|
|
|
|
/**
|
|
* Kalman smoothing function.
|
|
*
|
|
* This function looks back pitch +/- 3 samples back into history to find
|
|
* the best fitting curve (that one giving the optimal gain of the two
|
|
* signals, i.e. the highest dot product between the two), and then
|
|
* uses that signal history to smoothen the output of the speech synthesis
|
|
* filter.
|
|
*
|
|
* @param s WMA Voice decoding context
|
|
* @param pitch pitch of the speech signal
|
|
* @param in input speech signal
|
|
* @param out output pointer for smoothened signal
|
|
* @param size input/output buffer size
|
|
*
|
|
* @returns -1 if no smoothening took place, e.g. because no optimal
|
|
* fit could be found, or 0 on success.
|
|
*/
|
|
static int kalman_smoothen(WMAVoiceContext *s, int pitch,
|
|
const float *in, float *out, int size)
|
|
{
|
|
int n;
|
|
float optimal_gain = 0, dot;
|
|
const float *ptr = &in[-FFMAX(s->min_pitch_val, pitch - 3)],
|
|
*end = &in[-FFMIN(s->max_pitch_val, pitch + 3)],
|
|
*best_hist_ptr = NULL;
|
|
|
|
/* find best fitting point in history */
|
|
do {
|
|
dot = avpriv_scalarproduct_float_c(in, ptr, size);
|
|
if (dot > optimal_gain) {
|
|
optimal_gain = dot;
|
|
best_hist_ptr = ptr;
|
|
}
|
|
} while (--ptr >= end);
|
|
|
|
if (optimal_gain <= 0)
|
|
return -1;
|
|
dot = avpriv_scalarproduct_float_c(best_hist_ptr, best_hist_ptr, size);
|
|
if (dot <= 0) // would be 1.0
|
|
return -1;
|
|
|
|
if (optimal_gain <= dot) {
|
|
dot = dot / (dot + 0.6 * optimal_gain); // 0.625-1.000
|
|
} else
|
|
dot = 0.625;
|
|
|
|
/* actual smoothing */
|
|
for (n = 0; n < size; n++)
|
|
out[n] = best_hist_ptr[n] + dot * (in[n] - best_hist_ptr[n]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Get the tilt factor of a formant filter from its transfer function
|
|
* @see #tilt_factor() in amrnbdec.c, which does essentially the same,
|
|
* but somehow (??) it does a speech synthesis filter in the
|
|
* middle, which is missing here
|
|
*
|
|
* @param lpcs LPC coefficients
|
|
* @param n_lpcs Size of LPC buffer
|
|
* @returns the tilt factor
|
|
*/
|
|
static float tilt_factor(const float *lpcs, int n_lpcs)
|
|
{
|
|
float rh0, rh1;
|
|
|
|
rh0 = 1.0 + avpriv_scalarproduct_float_c(lpcs, lpcs, n_lpcs);
|
|
rh1 = lpcs[0] + avpriv_scalarproduct_float_c(lpcs, &lpcs[1], n_lpcs - 1);
|
|
|
|
return rh1 / rh0;
|
|
}
|
|
|
|
/**
|
|
* Derive denoise filter coefficients (in real domain) from the LPCs.
|
|
*/
|
|
static void calc_input_response(WMAVoiceContext *s, float *lpcs,
|
|
int fcb_type, float *coeffs, int remainder)
|
|
{
|
|
float last_coeff, min = 15.0, max = -15.0;
|
|
float irange, angle_mul, gain_mul, range, sq;
|
|
int n, idx;
|
|
|
|
/* Create frequency power spectrum of speech input (i.e. RDFT of LPCs) */
|
|
s->rdft.rdft_calc(&s->rdft, lpcs);
|
|
#define log_range(var, assign) do { \
|
|
float tmp = log10f(assign); var = tmp; \
|
|
max = FFMAX(max, tmp); min = FFMIN(min, tmp); \
|
|
} while (0)
|
|
log_range(last_coeff, lpcs[1] * lpcs[1]);
|
|
for (n = 1; n < 64; n++)
|
|
log_range(lpcs[n], lpcs[n * 2] * lpcs[n * 2] +
|
|
lpcs[n * 2 + 1] * lpcs[n * 2 + 1]);
|
|
log_range(lpcs[0], lpcs[0] * lpcs[0]);
|
|
#undef log_range
|
|
range = max - min;
|
|
lpcs[64] = last_coeff;
|
|
|
|
/* Now, use this spectrum to pick out these frequencies with higher
|
|
* (relative) power/energy (which we then take to be "not noise"),
|
|
* and set up a table (still in lpc[]) of (relative) gains per frequency.
|
|
* These frequencies will be maintained, while others ("noise") will be
|
|
* decreased in the filter output. */
|
|
irange = 64.0 / range; // so irange*(max-value) is in the range [0, 63]
|
|
gain_mul = range * (fcb_type == FCB_TYPE_HARDCODED ? (5.0 / 13.0) :
|
|
(5.0 / 14.7));
|
|
angle_mul = gain_mul * (8.0 * M_LN10 / M_PI);
|
|
for (n = 0; n <= 64; n++) {
|
|
float pwr;
|
|
|
|
idx = FFMAX(0, lrint((max - lpcs[n]) * irange) - 1);
|
|
pwr = wmavoice_denoise_power_table[s->denoise_strength][idx];
|
|
lpcs[n] = angle_mul * pwr;
|
|
|
|
/* 70.57 =~ 1/log10(1.0331663) */
|
|
idx = (pwr * gain_mul - 0.0295) * 70.570526123;
|
|
if (idx > 127) { // fall back if index falls outside table range
|
|
coeffs[n] = wmavoice_energy_table[127] *
|
|
powf(1.0331663, idx - 127);
|
|
} else
|
|
coeffs[n] = wmavoice_energy_table[FFMAX(0, idx)];
|
|
}
|
|
|
|
/* calculate the Hilbert transform of the gains, which we do (since this
|
|
* is a sine input) by doing a phase shift (in theory, H(sin())=cos()).
|
|
* Hilbert_Transform(RDFT(x)) = Laplace_Transform(x), which calculates the
|
|
* "moment" of the LPCs in this filter. */
|
|
s->dct.dct_calc(&s->dct, lpcs);
|
|
s->dst.dct_calc(&s->dst, lpcs);
|
|
|
|
/* Split out the coefficient indexes into phase/magnitude pairs */
|
|
idx = 255 + av_clip(lpcs[64], -255, 255);
|
|
coeffs[0] = coeffs[0] * s->cos[idx];
|
|
idx = 255 + av_clip(lpcs[64] - 2 * lpcs[63], -255, 255);
|
|
last_coeff = coeffs[64] * s->cos[idx];
|
|
for (n = 63;; n--) {
|
|
idx = 255 + av_clip(-lpcs[64] - 2 * lpcs[n - 1], -255, 255);
|
|
coeffs[n * 2 + 1] = coeffs[n] * s->sin[idx];
|
|
coeffs[n * 2] = coeffs[n] * s->cos[idx];
|
|
|
|
if (!--n) break;
|
|
|
|
idx = 255 + av_clip( lpcs[64] - 2 * lpcs[n - 1], -255, 255);
|
|
coeffs[n * 2 + 1] = coeffs[n] * s->sin[idx];
|
|
coeffs[n * 2] = coeffs[n] * s->cos[idx];
|
|
}
|
|
coeffs[1] = last_coeff;
|
|
|
|
/* move into real domain */
|
|
s->irdft.rdft_calc(&s->irdft, coeffs);
|
|
|
|
/* tilt correction and normalize scale */
|
|
memset(&coeffs[remainder], 0, sizeof(coeffs[0]) * (128 - remainder));
|
|
if (s->denoise_tilt_corr) {
|
|
float tilt_mem = 0;
|
|
|
|
coeffs[remainder - 1] = 0;
|
|
ff_tilt_compensation(&tilt_mem,
|
|
-1.8 * tilt_factor(coeffs, remainder - 1),
|
|
coeffs, remainder);
|
|
}
|
|
sq = (1.0 / 64.0) * sqrtf(1 / avpriv_scalarproduct_float_c(coeffs, coeffs,
|
|
remainder));
|
|
for (n = 0; n < remainder; n++)
|
|
coeffs[n] *= sq;
|
|
}
|
|
|
|
/**
|
|
* This function applies a Wiener filter on the (noisy) speech signal as
|
|
* a means to denoise it.
|
|
*
|
|
* - take RDFT of LPCs to get the power spectrum of the noise + speech;
|
|
* - using this power spectrum, calculate (for each frequency) the Wiener
|
|
* filter gain, which depends on the frequency power and desired level
|
|
* of noise subtraction (when set too high, this leads to artifacts)
|
|
* We can do this symmetrically over the X-axis (so 0-4kHz is the inverse
|
|
* of 4-8kHz);
|
|
* - by doing a phase shift, calculate the Hilbert transform of this array
|
|
* of per-frequency filter-gains to get the filtering coefficients;
|
|
* - smoothen/normalize/de-tilt these filter coefficients as desired;
|
|
* - take RDFT of noisy sound, apply the coefficients and take its IRDFT
|
|
* to get the denoised speech signal;
|
|
* - the leftover (i.e. output of the IRDFT on denoised speech data beyond
|
|
* the frame boundary) are saved and applied to subsequent frames by an
|
|
* overlap-add method (otherwise you get clicking-artifacts).
|
|
*
|
|
* @param s WMA Voice decoding context
|
|
* @param fcb_type Frame (codebook) type
|
|
* @param synth_pf input: the noisy speech signal, output: denoised speech
|
|
* data; should be 16-byte aligned (for ASM purposes)
|
|
* @param size size of the speech data
|
|
* @param lpcs LPCs used to synthesize this frame's speech data
|
|
*/
|
|
static void wiener_denoise(WMAVoiceContext *s, int fcb_type,
|
|
float *synth_pf, int size,
|
|
const float *lpcs)
|
|
{
|
|
int remainder, lim, n;
|
|
|
|
if (fcb_type != FCB_TYPE_SILENCE) {
|
|
float *tilted_lpcs = s->tilted_lpcs_pf,
|
|
*coeffs = s->denoise_coeffs_pf, tilt_mem = 0;
|
|
|
|
tilted_lpcs[0] = 1.0;
|
|
memcpy(&tilted_lpcs[1], lpcs, sizeof(lpcs[0]) * s->lsps);
|
|
memset(&tilted_lpcs[s->lsps + 1], 0,
|
|
sizeof(tilted_lpcs[0]) * (128 - s->lsps - 1));
|
|
ff_tilt_compensation(&tilt_mem, 0.7 * tilt_factor(lpcs, s->lsps),
|
|
tilted_lpcs, s->lsps + 2);
|
|
|
|
/* The IRDFT output (127 samples for 7-bit filter) beyond the frame
|
|
* size is applied to the next frame. All input beyond this is zero,
|
|
* and thus all output beyond this will go towards zero, hence we can
|
|
* limit to min(size-1, 127-size) as a performance consideration. */
|
|
remainder = FFMIN(127 - size, size - 1);
|
|
calc_input_response(s, tilted_lpcs, fcb_type, coeffs, remainder);
|
|
|
|
/* apply coefficients (in frequency spectrum domain), i.e. complex
|
|
* number multiplication */
|
|
memset(&synth_pf[size], 0, sizeof(synth_pf[0]) * (128 - size));
|
|
s->rdft.rdft_calc(&s->rdft, synth_pf);
|
|
s->rdft.rdft_calc(&s->rdft, coeffs);
|
|
synth_pf[0] *= coeffs[0];
|
|
synth_pf[1] *= coeffs[1];
|
|
for (n = 1; n < 64; n++) {
|
|
float v1 = synth_pf[n * 2], v2 = synth_pf[n * 2 + 1];
|
|
synth_pf[n * 2] = v1 * coeffs[n * 2] - v2 * coeffs[n * 2 + 1];
|
|
synth_pf[n * 2 + 1] = v2 * coeffs[n * 2] + v1 * coeffs[n * 2 + 1];
|
|
}
|
|
s->irdft.rdft_calc(&s->irdft, synth_pf);
|
|
}
|
|
|
|
/* merge filter output with the history of previous runs */
|
|
if (s->denoise_filter_cache_size) {
|
|
lim = FFMIN(s->denoise_filter_cache_size, size);
|
|
for (n = 0; n < lim; n++)
|
|
synth_pf[n] += s->denoise_filter_cache[n];
|
|
s->denoise_filter_cache_size -= lim;
|
|
memmove(s->denoise_filter_cache, &s->denoise_filter_cache[size],
|
|
sizeof(s->denoise_filter_cache[0]) * s->denoise_filter_cache_size);
|
|
}
|
|
|
|
/* move remainder of filter output into a cache for future runs */
|
|
if (fcb_type != FCB_TYPE_SILENCE) {
|
|
lim = FFMIN(remainder, s->denoise_filter_cache_size);
|
|
for (n = 0; n < lim; n++)
|
|
s->denoise_filter_cache[n] += synth_pf[size + n];
|
|
if (lim < remainder) {
|
|
memcpy(&s->denoise_filter_cache[lim], &synth_pf[size + lim],
|
|
sizeof(s->denoise_filter_cache[0]) * (remainder - lim));
|
|
s->denoise_filter_cache_size = remainder;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Averaging projection filter, the postfilter used in WMAVoice.
|
|
*
|
|
* This uses the following steps:
|
|
* - A zero-synthesis filter (generate excitation from synth signal)
|
|
* - Kalman smoothing on excitation, based on pitch
|
|
* - Re-synthesized smoothened output
|
|
* - Iterative Wiener denoise filter
|
|
* - Adaptive gain filter
|
|
* - DC filter
|
|
*
|
|
* @param s WMAVoice decoding context
|
|
* @param synth Speech synthesis output (before postfilter)
|
|
* @param samples Output buffer for filtered samples
|
|
* @param size Buffer size of synth & samples
|
|
* @param lpcs Generated LPCs used for speech synthesis
|
|
* @param zero_exc_pf destination for zero synthesis filter (16-byte aligned)
|
|
* @param fcb_type Frame type (silence, hardcoded, AW-pulses or FCB-pulses)
|
|
* @param pitch Pitch of the input signal
|
|
*/
|
|
static void postfilter(WMAVoiceContext *s, const float *synth,
|
|
float *samples, int size,
|
|
const float *lpcs, float *zero_exc_pf,
|
|
int fcb_type, int pitch)
|
|
{
|
|
float synth_filter_in_buf[MAX_FRAMESIZE / 2],
|
|
*synth_pf = &s->synth_filter_out_buf[MAX_LSPS_ALIGN16],
|
|
*synth_filter_in = zero_exc_pf;
|
|
|
|
av_assert0(size <= MAX_FRAMESIZE / 2);
|
|
|
|
/* generate excitation from input signal */
|
|
ff_celp_lp_zero_synthesis_filterf(zero_exc_pf, lpcs, synth, size, s->lsps);
|
|
|
|
if (fcb_type >= FCB_TYPE_AW_PULSES &&
|
|
!kalman_smoothen(s, pitch, zero_exc_pf, synth_filter_in_buf, size))
|
|
synth_filter_in = synth_filter_in_buf;
|
|
|
|
/* re-synthesize speech after smoothening, and keep history */
|
|
ff_celp_lp_synthesis_filterf(synth_pf, lpcs,
|
|
synth_filter_in, size, s->lsps);
|
|
memcpy(&synth_pf[-s->lsps], &synth_pf[size - s->lsps],
|
|
sizeof(synth_pf[0]) * s->lsps);
|
|
|
|
wiener_denoise(s, fcb_type, synth_pf, size, lpcs);
|
|
|
|
adaptive_gain_control(samples, synth_pf, synth, size, 0.99,
|
|
&s->postfilter_agc);
|
|
|
|
if (s->dc_level > 8) {
|
|
/* remove ultra-low frequency DC noise / highpass filter;
|
|
* coefficients are identical to those used in SIPR decoding,
|
|
* and very closely resemble those used in AMR-NB decoding. */
|
|
ff_acelp_apply_order_2_transfer_function(samples, samples,
|
|
(const float[2]) { -1.99997, 1.0 },
|
|
(const float[2]) { -1.9330735188, 0.93589198496 },
|
|
0.93980580475, s->dcf_mem, size);
|
|
}
|
|
}
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
/**
|
|
* Dequantize LSPs
|
|
* @param lsps output pointer to the array that will hold the LSPs
|
|
* @param num number of LSPs to be dequantized
|
|
* @param values quantized values, contains n_stages values
|
|
* @param sizes range (i.e. max value) of each quantized value
|
|
* @param n_stages number of dequantization runs
|
|
* @param table dequantization table to be used
|
|
* @param mul_q LSF multiplier
|
|
* @param base_q base (lowest) LSF values
|
|
*/
|
|
static void dequant_lsps(double *lsps, int num,
|
|
const uint16_t *values,
|
|
const uint16_t *sizes,
|
|
int n_stages, const uint8_t *table,
|
|
const double *mul_q,
|
|
const double *base_q)
|
|
{
|
|
int n, m;
|
|
|
|
memset(lsps, 0, num * sizeof(*lsps));
|
|
for (n = 0; n < n_stages; n++) {
|
|
const uint8_t *t_off = &table[values[n] * num];
|
|
double base = base_q[n], mul = mul_q[n];
|
|
|
|
for (m = 0; m < num; m++)
|
|
lsps[m] += base + mul * t_off[m];
|
|
|
|
table += sizes[n] * num;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @name LSP dequantization routines
|
|
* LSP dequantization routines, for 10/16LSPs and independent/residual coding.
|
|
* @note we assume enough bits are available, caller should check.
|
|
* lsp10i() consumes 24 bits; lsp10r() consumes an additional 24 bits;
|
|
* lsp16i() consumes 34 bits; lsp16r() consumes an additional 26 bits.
|
|
* @{
|
|
*/
|
|
/**
|
|
* Parse 10 independently-coded LSPs.
|
|
*/
|
|
static void dequant_lsp10i(GetBitContext *gb, double *lsps)
|
|
{
|
|
static const uint16_t vec_sizes[4] = { 256, 64, 32, 32 };
|
|
static const double mul_lsf[4] = {
|
|
5.2187144800e-3, 1.4626986422e-3,
|
|
9.6179549166e-4, 1.1325736225e-3
|
|
};
|
|
static const double base_lsf[4] = {
|
|
M_PI * -2.15522e-1, M_PI * -6.1646e-2,
|
|
M_PI * -3.3486e-2, M_PI * -5.7408e-2
|
|
};
|
|
uint16_t v[4];
|
|
|
|
v[0] = get_bits(gb, 8);
|
|
v[1] = get_bits(gb, 6);
|
|
v[2] = get_bits(gb, 5);
|
|
v[3] = get_bits(gb, 5);
|
|
|
|
dequant_lsps(lsps, 10, v, vec_sizes, 4, wmavoice_dq_lsp10i,
|
|
mul_lsf, base_lsf);
|
|
}
|
|
|
|
/**
|
|
* Parse 10 independently-coded LSPs, and then derive the tables to
|
|
* generate LSPs for the other frames from them (residual coding).
|
|
*/
|
|
static void dequant_lsp10r(GetBitContext *gb,
|
|
double *i_lsps, const double *old,
|
|
double *a1, double *a2, int q_mode)
|
|
{
|
|
static const uint16_t vec_sizes[3] = { 128, 64, 64 };
|
|
static const double mul_lsf[3] = {
|
|
2.5807601174e-3, 1.2354460219e-3, 1.1763821673e-3
|
|
};
|
|
static const double base_lsf[3] = {
|
|
M_PI * -1.07448e-1, M_PI * -5.2706e-2, M_PI * -5.1634e-2
|
|
};
|
|
const float (*ipol_tab)[2][10] = q_mode ?
|
|
wmavoice_lsp10_intercoeff_b : wmavoice_lsp10_intercoeff_a;
|
|
uint16_t interpol, v[3];
|
|
int n;
|
|
|
|
dequant_lsp10i(gb, i_lsps);
|
|
|
|
interpol = get_bits(gb, 5);
|
|
v[0] = get_bits(gb, 7);
|
|
v[1] = get_bits(gb, 6);
|
|
v[2] = get_bits(gb, 6);
|
|
|
|
for (n = 0; n < 10; n++) {
|
|
double delta = old[n] - i_lsps[n];
|
|
a1[n] = ipol_tab[interpol][0][n] * delta + i_lsps[n];
|
|
a1[10 + n] = ipol_tab[interpol][1][n] * delta + i_lsps[n];
|
|
}
|
|
|
|
dequant_lsps(a2, 20, v, vec_sizes, 3, wmavoice_dq_lsp10r,
|
|
mul_lsf, base_lsf);
|
|
}
|
|
|
|
/**
|
|
* Parse 16 independently-coded LSPs.
|
|
*/
|
|
static void dequant_lsp16i(GetBitContext *gb, double *lsps)
|
|
{
|
|
static const uint16_t vec_sizes[5] = { 256, 64, 128, 64, 128 };
|
|
static const double mul_lsf[5] = {
|
|
3.3439586280e-3, 6.9908173703e-4,
|
|
3.3216608306e-3, 1.0334960326e-3,
|
|
3.1899104283e-3
|
|
};
|
|
static const double base_lsf[5] = {
|
|
M_PI * -1.27576e-1, M_PI * -2.4292e-2,
|
|
M_PI * -1.28094e-1, M_PI * -3.2128e-2,
|
|
M_PI * -1.29816e-1
|
|
};
|
|
uint16_t v[5];
|
|
|
|
v[0] = get_bits(gb, 8);
|
|
v[1] = get_bits(gb, 6);
|
|
v[2] = get_bits(gb, 7);
|
|
v[3] = get_bits(gb, 6);
|
|
v[4] = get_bits(gb, 7);
|
|
|
|
dequant_lsps( lsps, 5, v, vec_sizes, 2,
|
|
wmavoice_dq_lsp16i1, mul_lsf, base_lsf);
|
|
dequant_lsps(&lsps[5], 5, &v[2], &vec_sizes[2], 2,
|
|
wmavoice_dq_lsp16i2, &mul_lsf[2], &base_lsf[2]);
|
|
dequant_lsps(&lsps[10], 6, &v[4], &vec_sizes[4], 1,
|
|
wmavoice_dq_lsp16i3, &mul_lsf[4], &base_lsf[4]);
|
|
}
|
|
|
|
/**
|
|
* Parse 16 independently-coded LSPs, and then derive the tables to
|
|
* generate LSPs for the other frames from them (residual coding).
|
|
*/
|
|
static void dequant_lsp16r(GetBitContext *gb,
|
|
double *i_lsps, const double *old,
|
|
double *a1, double *a2, int q_mode)
|
|
{
|
|
static const uint16_t vec_sizes[3] = { 128, 128, 128 };
|
|
static const double mul_lsf[3] = {
|
|
1.2232979501e-3, 1.4062241527e-3, 1.6114744851e-3
|
|
};
|
|
static const double base_lsf[3] = {
|
|
M_PI * -5.5830e-2, M_PI * -5.2908e-2, M_PI * -5.4776e-2
|
|
};
|
|
const float (*ipol_tab)[2][16] = q_mode ?
|
|
wmavoice_lsp16_intercoeff_b : wmavoice_lsp16_intercoeff_a;
|
|
uint16_t interpol, v[3];
|
|
int n;
|
|
|
|
dequant_lsp16i(gb, i_lsps);
|
|
|
|
interpol = get_bits(gb, 5);
|
|
v[0] = get_bits(gb, 7);
|
|
v[1] = get_bits(gb, 7);
|
|
v[2] = get_bits(gb, 7);
|
|
|
|
for (n = 0; n < 16; n++) {
|
|
double delta = old[n] - i_lsps[n];
|
|
a1[n] = ipol_tab[interpol][0][n] * delta + i_lsps[n];
|
|
a1[16 + n] = ipol_tab[interpol][1][n] * delta + i_lsps[n];
|
|
}
|
|
|
|
dequant_lsps( a2, 10, v, vec_sizes, 1,
|
|
wmavoice_dq_lsp16r1, mul_lsf, base_lsf);
|
|
dequant_lsps(&a2[10], 10, &v[1], &vec_sizes[1], 1,
|
|
wmavoice_dq_lsp16r2, &mul_lsf[1], &base_lsf[1]);
|
|
dequant_lsps(&a2[20], 12, &v[2], &vec_sizes[2], 1,
|
|
wmavoice_dq_lsp16r3, &mul_lsf[2], &base_lsf[2]);
|
|
}
|
|
|
|
/**
|
|
* @}
|
|
* @name Pitch-adaptive window coding functions
|
|
* The next few functions are for pitch-adaptive window coding.
|
|
* @{
|
|
*/
|
|
/**
|
|
* Parse the offset of the first pitch-adaptive window pulses, and
|
|
* the distribution of pulses between the two blocks in this frame.
|
|
* @param s WMA Voice decoding context private data
|
|
* @param gb bit I/O context
|
|
* @param pitch pitch for each block in this frame
|
|
*/
|
|
static void aw_parse_coords(WMAVoiceContext *s, GetBitContext *gb,
|
|
const int *pitch)
|
|
{
|
|
static const int16_t start_offset[94] = {
|
|
-11, -9, -7, -5, -3, -1, 1, 3, 5, 7, 9, 11,
|
|
13, 15, 18, 17, 19, 20, 21, 22, 23, 24, 25, 26,
|
|
27, 28, 29, 30, 31, 32, 33, 35, 37, 39, 41, 43,
|
|
45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67,
|
|
69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91,
|
|
93, 95, 97, 99, 101, 103, 105, 107, 109, 111, 113, 115,
|
|
117, 119, 121, 123, 125, 127, 129, 131, 133, 135, 137, 139,
|
|
141, 143, 145, 147, 149, 151, 153, 155, 157, 159
|
|
};
|
|
int bits, offset;
|
|
|
|
/* position of pulse */
|
|
s->aw_idx_is_ext = 0;
|
|
if ((bits = get_bits(gb, 6)) >= 54) {
|
|
s->aw_idx_is_ext = 1;
|
|
bits += (bits - 54) * 3 + get_bits(gb, 2);
|
|
}
|
|
|
|
/* for a repeated pulse at pulse_off with a pitch_lag of pitch[], count
|
|
* the distribution of the pulses in each block contained in this frame. */
|
|
s->aw_pulse_range = FFMIN(pitch[0], pitch[1]) > 32 ? 24 : 16;
|
|
for (offset = start_offset[bits]; offset < 0; offset += pitch[0]) ;
|
|
s->aw_n_pulses[0] = (pitch[0] - 1 + MAX_FRAMESIZE / 2 - offset) / pitch[0];
|
|
s->aw_first_pulse_off[0] = offset - s->aw_pulse_range / 2;
|
|
offset += s->aw_n_pulses[0] * pitch[0];
|
|
s->aw_n_pulses[1] = (pitch[1] - 1 + MAX_FRAMESIZE - offset) / pitch[1];
|
|
s->aw_first_pulse_off[1] = offset - (MAX_FRAMESIZE + s->aw_pulse_range) / 2;
|
|
|
|
/* if continuing from a position before the block, reset position to
|
|
* start of block (when corrected for the range over which it can be
|
|
* spread in aw_pulse_set1()). */
|
|
if (start_offset[bits] < MAX_FRAMESIZE / 2) {
|
|
while (s->aw_first_pulse_off[1] - pitch[1] + s->aw_pulse_range > 0)
|
|
s->aw_first_pulse_off[1] -= pitch[1];
|
|
if (start_offset[bits] < 0)
|
|
while (s->aw_first_pulse_off[0] - pitch[0] + s->aw_pulse_range > 0)
|
|
s->aw_first_pulse_off[0] -= pitch[0];
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Apply second set of pitch-adaptive window pulses.
|
|
* @param s WMA Voice decoding context private data
|
|
* @param gb bit I/O context
|
|
* @param block_idx block index in frame [0, 1]
|
|
* @param fcb structure containing fixed codebook vector info
|
|
* @return -1 on error, 0 otherwise
|
|
*/
|
|
static int aw_pulse_set2(WMAVoiceContext *s, GetBitContext *gb,
|
|
int block_idx, AMRFixed *fcb)
|
|
{
|
|
uint16_t use_mask_mem[9]; // only 5 are used, rest is padding
|
|
uint16_t *use_mask = use_mask_mem + 2;
|
|
/* in this function, idx is the index in the 80-bit (+ padding) use_mask
|
|
* bit-array. Since use_mask consists of 16-bit values, the lower 4 bits
|
|
* of idx are the position of the bit within a particular item in the
|
|
* array (0 being the most significant bit, and 15 being the least
|
|
* significant bit), and the remainder (>> 4) is the index in the
|
|
* use_mask[]-array. This is faster and uses less memory than using a
|
|
* 80-byte/80-int array. */
|
|
int pulse_off = s->aw_first_pulse_off[block_idx],
|
|
pulse_start, n, idx, range, aidx, start_off = 0;
|
|
|
|
/* set offset of first pulse to within this block */
|
|
if (s->aw_n_pulses[block_idx] > 0)
|
|
while (pulse_off + s->aw_pulse_range < 1)
|
|
pulse_off += fcb->pitch_lag;
|
|
|
|
/* find range per pulse */
|
|
if (s->aw_n_pulses[0] > 0) {
|
|
if (block_idx == 0) {
|
|
range = 32;
|
|
} else /* block_idx = 1 */ {
|
|
range = 8;
|
|
if (s->aw_n_pulses[block_idx] > 0)
|
|
pulse_off = s->aw_next_pulse_off_cache;
|
|
}
|
|
} else
|
|
range = 16;
|
|
pulse_start = s->aw_n_pulses[block_idx] > 0 ? pulse_off - range / 2 : 0;
|
|
|
|
/* aw_pulse_set1() already applies pulses around pulse_off (to be exactly,
|
|
* in the range of [pulse_off, pulse_off + s->aw_pulse_range], and thus
|
|
* we exclude that range from being pulsed again in this function. */
|
|
memset(&use_mask[-2], 0, 2 * sizeof(use_mask[0]));
|
|
memset( use_mask, -1, 5 * sizeof(use_mask[0]));
|
|
memset(&use_mask[5], 0, 2 * sizeof(use_mask[0]));
|
|
if (s->aw_n_pulses[block_idx] > 0)
|
|
for (idx = pulse_off; idx < MAX_FRAMESIZE / 2; idx += fcb->pitch_lag) {
|
|
int excl_range = s->aw_pulse_range; // always 16 or 24
|
|
uint16_t *use_mask_ptr = &use_mask[idx >> 4];
|
|
int first_sh = 16 - (idx & 15);
|
|
*use_mask_ptr++ &= 0xFFFFu << first_sh;
|
|
excl_range -= first_sh;
|
|
if (excl_range >= 16) {
|
|
*use_mask_ptr++ = 0;
|
|
*use_mask_ptr &= 0xFFFF >> (excl_range - 16);
|
|
} else
|
|
*use_mask_ptr &= 0xFFFF >> excl_range;
|
|
}
|
|
|
|
/* find the 'aidx'th offset that is not excluded */
|
|
aidx = get_bits(gb, s->aw_n_pulses[0] > 0 ? 5 - 2 * block_idx : 4);
|
|
for (n = 0; n <= aidx; pulse_start++) {
|
|
for (idx = pulse_start; idx < 0; idx += fcb->pitch_lag) ;
|
|
if (idx >= MAX_FRAMESIZE / 2) { // find from zero
|
|
if (use_mask[0]) idx = 0x0F;
|
|
else if (use_mask[1]) idx = 0x1F;
|
|
else if (use_mask[2]) idx = 0x2F;
|
|
else if (use_mask[3]) idx = 0x3F;
|
|
else if (use_mask[4]) idx = 0x4F;
|
|
else return -1;
|
|
idx -= av_log2_16bit(use_mask[idx >> 4]);
|
|
}
|
|
if (use_mask[idx >> 4] & (0x8000 >> (idx & 15))) {
|
|
use_mask[idx >> 4] &= ~(0x8000 >> (idx & 15));
|
|
n++;
|
|
start_off = idx;
|
|
}
|
|
}
|
|
|
|
fcb->x[fcb->n] = start_off;
|
|
fcb->y[fcb->n] = get_bits1(gb) ? -1.0 : 1.0;
|
|
fcb->n++;
|
|
|
|
/* set offset for next block, relative to start of that block */
|
|
n = (MAX_FRAMESIZE / 2 - start_off) % fcb->pitch_lag;
|
|
s->aw_next_pulse_off_cache = n ? fcb->pitch_lag - n : 0;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Apply first set of pitch-adaptive window pulses.
|
|
* @param s WMA Voice decoding context private data
|
|
* @param gb bit I/O context
|
|
* @param block_idx block index in frame [0, 1]
|
|
* @param fcb storage location for fixed codebook pulse info
|
|
*/
|
|
static void aw_pulse_set1(WMAVoiceContext *s, GetBitContext *gb,
|
|
int block_idx, AMRFixed *fcb)
|
|
{
|
|
int val = get_bits(gb, 12 - 2 * (s->aw_idx_is_ext && !block_idx));
|
|
float v;
|
|
|
|
if (s->aw_n_pulses[block_idx] > 0) {
|
|
int n, v_mask, i_mask, sh, n_pulses;
|
|
|
|
if (s->aw_pulse_range == 24) { // 3 pulses, 1:sign + 3:index each
|
|
n_pulses = 3;
|
|
v_mask = 8;
|
|
i_mask = 7;
|
|
sh = 4;
|
|
} else { // 4 pulses, 1:sign + 2:index each
|
|
n_pulses = 4;
|
|
v_mask = 4;
|
|
i_mask = 3;
|
|
sh = 3;
|
|
}
|
|
|
|
for (n = n_pulses - 1; n >= 0; n--, val >>= sh) {
|
|
fcb->y[fcb->n] = (val & v_mask) ? -1.0 : 1.0;
|
|
fcb->x[fcb->n] = (val & i_mask) * n_pulses + n +
|
|
s->aw_first_pulse_off[block_idx];
|
|
while (fcb->x[fcb->n] < 0)
|
|
fcb->x[fcb->n] += fcb->pitch_lag;
|
|
if (fcb->x[fcb->n] < MAX_FRAMESIZE / 2)
|
|
fcb->n++;
|
|
}
|
|
} else {
|
|
int num2 = (val & 0x1FF) >> 1, delta, idx;
|
|
|
|
if (num2 < 1 * 79) { delta = 1; idx = num2 + 1; }
|
|
else if (num2 < 2 * 78) { delta = 3; idx = num2 + 1 - 1 * 77; }
|
|
else if (num2 < 3 * 77) { delta = 5; idx = num2 + 1 - 2 * 76; }
|
|
else { delta = 7; idx = num2 + 1 - 3 * 75; }
|
|
v = (val & 0x200) ? -1.0 : 1.0;
|
|
|
|
fcb->no_repeat_mask |= 3 << fcb->n;
|
|
fcb->x[fcb->n] = idx - delta;
|
|
fcb->y[fcb->n] = v;
|
|
fcb->x[fcb->n + 1] = idx;
|
|
fcb->y[fcb->n + 1] = (val & 1) ? -v : v;
|
|
fcb->n += 2;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @}
|
|
*
|
|
* Generate a random number from frame_cntr and block_idx, which will lief
|
|
* in the range [0, 1000 - block_size] (so it can be used as an index in a
|
|
* table of size 1000 of which you want to read block_size entries).
|
|
*
|
|
* @param frame_cntr current frame number
|
|
* @param block_num current block index
|
|
* @param block_size amount of entries we want to read from a table
|
|
* that has 1000 entries
|
|
* @return a (non-)random number in the [0, 1000 - block_size] range.
|
|
*/
|
|
static int pRNG(int frame_cntr, int block_num, int block_size)
|
|
{
|
|
/* array to simplify the calculation of z:
|
|
* y = (x % 9) * 5 + 6;
|
|
* z = (49995 * x) / y;
|
|
* Since y only has 9 values, we can remove the division by using a
|
|
* LUT and using FASTDIV-style divisions. For each of the 9 values
|
|
* of y, we can rewrite z as:
|
|
* z = x * (49995 / y) + x * ((49995 % y) / y)
|
|
* In this table, each col represents one possible value of y, the
|
|
* first number is 49995 / y, and the second is the FASTDIV variant
|
|
* of 49995 % y / y. */
|
|
static const unsigned int div_tbl[9][2] = {
|
|
{ 8332, 3 * 715827883U }, // y = 6
|
|
{ 4545, 0 * 390451573U }, // y = 11
|
|
{ 3124, 11 * 268435456U }, // y = 16
|
|
{ 2380, 15 * 204522253U }, // y = 21
|
|
{ 1922, 23 * 165191050U }, // y = 26
|
|
{ 1612, 23 * 138547333U }, // y = 31
|
|
{ 1388, 27 * 119304648U }, // y = 36
|
|
{ 1219, 16 * 104755300U }, // y = 41
|
|
{ 1086, 39 * 93368855U } // y = 46
|
|
};
|
|
unsigned int z, y, x = MUL16(block_num, 1877) + frame_cntr;
|
|
if (x >= 0xFFFF) x -= 0xFFFF; // max value of x is 8*1877+0xFFFE=0x13AA6,
|
|
// so this is effectively a modulo (%)
|
|
y = x - 9 * MULH(477218589, x); // x % 9
|
|
z = (uint16_t) (x * div_tbl[y][0] + UMULH(x, div_tbl[y][1]));
|
|
// z = x * 49995 / (y * 5 + 6)
|
|
return z % (1000 - block_size);
|
|
}
|
|
|
|
/**
|
|
* Parse hardcoded signal for a single block.
|
|
* @note see #synth_block().
|
|
*/
|
|
static void synth_block_hardcoded(WMAVoiceContext *s, GetBitContext *gb,
|
|
int block_idx, int size,
|
|
const struct frame_type_desc *frame_desc,
|
|
float *excitation)
|
|
{
|
|
float gain;
|
|
int n, r_idx;
|
|
|
|
av_assert0(size <= MAX_FRAMESIZE);
|
|
|
|
/* Set the offset from which we start reading wmavoice_std_codebook */
|
|
if (frame_desc->fcb_type == FCB_TYPE_SILENCE) {
|
|
r_idx = pRNG(s->frame_cntr, block_idx, size);
|
|
gain = s->silence_gain;
|
|
} else /* FCB_TYPE_HARDCODED */ {
|
|
r_idx = get_bits(gb, 8);
|
|
gain = wmavoice_gain_universal[get_bits(gb, 6)];
|
|
}
|
|
|
|
/* Clear gain prediction parameters */
|
|
memset(s->gain_pred_err, 0, sizeof(s->gain_pred_err));
|
|
|
|
/* Apply gain to hardcoded codebook and use that as excitation signal */
|
|
for (n = 0; n < size; n++)
|
|
excitation[n] = wmavoice_std_codebook[r_idx + n] * gain;
|
|
}
|
|
|
|
/**
|
|
* Parse FCB/ACB signal for a single block.
|
|
* @note see #synth_block().
|
|
*/
|
|
static void synth_block_fcb_acb(WMAVoiceContext *s, GetBitContext *gb,
|
|
int block_idx, int size,
|
|
int block_pitch_sh2,
|
|
const struct frame_type_desc *frame_desc,
|
|
float *excitation)
|
|
{
|
|
static const float gain_coeff[6] = {
|
|
0.8169, -0.06545, 0.1726, 0.0185, -0.0359, 0.0458
|
|
};
|
|
float pulses[MAX_FRAMESIZE / 2], pred_err, acb_gain, fcb_gain;
|
|
int n, idx, gain_weight;
|
|
AMRFixed fcb;
|
|
|
|
av_assert0(size <= MAX_FRAMESIZE / 2);
|
|
memset(pulses, 0, sizeof(*pulses) * size);
|
|
|
|
fcb.pitch_lag = block_pitch_sh2 >> 2;
|
|
fcb.pitch_fac = 1.0;
|
|
fcb.no_repeat_mask = 0;
|
|
fcb.n = 0;
|
|
|
|
/* For the other frame types, this is where we apply the innovation
|
|
* (fixed) codebook pulses of the speech signal. */
|
|
if (frame_desc->fcb_type == FCB_TYPE_AW_PULSES) {
|
|
aw_pulse_set1(s, gb, block_idx, &fcb);
|
|
if (aw_pulse_set2(s, gb, block_idx, &fcb)) {
|
|
/* Conceal the block with silence and return.
|
|
* Skip the correct amount of bits to read the next
|
|
* block from the correct offset. */
|
|
int r_idx = pRNG(s->frame_cntr, block_idx, size);
|
|
|
|
for (n = 0; n < size; n++)
|
|
excitation[n] =
|
|
wmavoice_std_codebook[r_idx + n] * s->silence_gain;
|
|
skip_bits(gb, 7 + 1);
|
|
return;
|
|
}
|
|
} else /* FCB_TYPE_EXC_PULSES */ {
|
|
int offset_nbits = 5 - frame_desc->log_n_blocks;
|
|
|
|
fcb.no_repeat_mask = -1;
|
|
/* similar to ff_decode_10_pulses_35bits(), but with single pulses
|
|
* (instead of double) for a subset of pulses */
|
|
for (n = 0; n < 5; n++) {
|
|
float sign;
|
|
int pos1, pos2;
|
|
|
|
sign = get_bits1(gb) ? 1.0 : -1.0;
|
|
pos1 = get_bits(gb, offset_nbits);
|
|
fcb.x[fcb.n] = n + 5 * pos1;
|
|
fcb.y[fcb.n++] = sign;
|
|
if (n < frame_desc->dbl_pulses) {
|
|
pos2 = get_bits(gb, offset_nbits);
|
|
fcb.x[fcb.n] = n + 5 * pos2;
|
|
fcb.y[fcb.n++] = (pos1 < pos2) ? -sign : sign;
|
|
}
|
|
}
|
|
}
|
|
ff_set_fixed_vector(pulses, &fcb, 1.0, size);
|
|
|
|
/* Calculate gain for adaptive & fixed codebook signal.
|
|
* see ff_amr_set_fixed_gain(). */
|
|
idx = get_bits(gb, 7);
|
|
fcb_gain = expf(avpriv_scalarproduct_float_c(s->gain_pred_err,
|
|
gain_coeff, 6) -
|
|
5.2409161640 + wmavoice_gain_codebook_fcb[idx]);
|
|
acb_gain = wmavoice_gain_codebook_acb[idx];
|
|
pred_err = av_clipf(wmavoice_gain_codebook_fcb[idx],
|
|
-2.9957322736 /* log(0.05) */,
|
|
1.6094379124 /* log(5.0) */);
|
|
|
|
gain_weight = 8 >> frame_desc->log_n_blocks;
|
|
memmove(&s->gain_pred_err[gain_weight], s->gain_pred_err,
|
|
sizeof(*s->gain_pred_err) * (6 - gain_weight));
|
|
for (n = 0; n < gain_weight; n++)
|
|
s->gain_pred_err[n] = pred_err;
|
|
|
|
/* Calculation of adaptive codebook */
|
|
if (frame_desc->acb_type == ACB_TYPE_ASYMMETRIC) {
|
|
int len;
|
|
for (n = 0; n < size; n += len) {
|
|
int next_idx_sh16;
|
|
int abs_idx = block_idx * size + n;
|
|
int pitch_sh16 = (s->last_pitch_val << 16) +
|
|
s->pitch_diff_sh16 * abs_idx;
|
|
int pitch = (pitch_sh16 + 0x6FFF) >> 16;
|
|
int idx_sh16 = ((pitch << 16) - pitch_sh16) * 8 + 0x58000;
|
|
idx = idx_sh16 >> 16;
|
|
if (s->pitch_diff_sh16) {
|
|
if (s->pitch_diff_sh16 > 0) {
|
|
next_idx_sh16 = (idx_sh16) &~ 0xFFFF;
|
|
} else
|
|
next_idx_sh16 = (idx_sh16 + 0x10000) &~ 0xFFFF;
|
|
len = av_clip((idx_sh16 - next_idx_sh16) / s->pitch_diff_sh16 / 8,
|
|
1, size - n);
|
|
} else
|
|
len = size;
|
|
|
|
ff_acelp_interpolatef(&excitation[n], &excitation[n - pitch],
|
|
wmavoice_ipol1_coeffs, 17,
|
|
idx, 9, len);
|
|
}
|
|
} else /* ACB_TYPE_HAMMING */ {
|
|
int block_pitch = block_pitch_sh2 >> 2;
|
|
idx = block_pitch_sh2 & 3;
|
|
if (idx) {
|
|
ff_acelp_interpolatef(excitation, &excitation[-block_pitch],
|
|
wmavoice_ipol2_coeffs, 4,
|
|
idx, 8, size);
|
|
} else
|
|
av_memcpy_backptr((uint8_t *) excitation, sizeof(float) * block_pitch,
|
|
sizeof(float) * size);
|
|
}
|
|
|
|
/* Interpolate ACB/FCB and use as excitation signal */
|
|
ff_weighted_vector_sumf(excitation, excitation, pulses,
|
|
acb_gain, fcb_gain, size);
|
|
}
|
|
|
|
/**
|
|
* Parse data in a single block.
|
|
* @note we assume enough bits are available, caller should check.
|
|
*
|
|
* @param s WMA Voice decoding context private data
|
|
* @param gb bit I/O context
|
|
* @param block_idx index of the to-be-read block
|
|
* @param size amount of samples to be read in this block
|
|
* @param block_pitch_sh2 pitch for this block << 2
|
|
* @param lsps LSPs for (the end of) this frame
|
|
* @param prev_lsps LSPs for the last frame
|
|
* @param frame_desc frame type descriptor
|
|
* @param excitation target memory for the ACB+FCB interpolated signal
|
|
* @param synth target memory for the speech synthesis filter output
|
|
* @return 0 on success, <0 on error.
|
|
*/
|
|
static void synth_block(WMAVoiceContext *s, GetBitContext *gb,
|
|
int block_idx, int size,
|
|
int block_pitch_sh2,
|
|
const double *lsps, const double *prev_lsps,
|
|
const struct frame_type_desc *frame_desc,
|
|
float *excitation, float *synth)
|
|
{
|
|
double i_lsps[MAX_LSPS];
|
|
float lpcs[MAX_LSPS];
|
|
float fac;
|
|
int n;
|
|
|
|
if (frame_desc->acb_type == ACB_TYPE_NONE)
|
|
synth_block_hardcoded(s, gb, block_idx, size, frame_desc, excitation);
|
|
else
|
|
synth_block_fcb_acb(s, gb, block_idx, size, block_pitch_sh2,
|
|
frame_desc, excitation);
|
|
|
|
/* convert interpolated LSPs to LPCs */
|
|
fac = (block_idx + 0.5) / frame_desc->n_blocks;
|
|
for (n = 0; n < s->lsps; n++) // LSF -> LSP
|
|
i_lsps[n] = cos(prev_lsps[n] + fac * (lsps[n] - prev_lsps[n]));
|
|
ff_acelp_lspd2lpc(i_lsps, lpcs, s->lsps >> 1);
|
|
|
|
/* Speech synthesis */
|
|
ff_celp_lp_synthesis_filterf(synth, lpcs, excitation, size, s->lsps);
|
|
}
|
|
|
|
/**
|
|
* Synthesize output samples for a single frame.
|
|
* @note we assume enough bits are available, caller should check.
|
|
*
|
|
* @param ctx WMA Voice decoder context
|
|
* @param gb bit I/O context (s->gb or one for cross-packet superframes)
|
|
* @param frame_idx Frame number within superframe [0-2]
|
|
* @param samples pointer to output sample buffer, has space for at least 160
|
|
* samples
|
|
* @param lsps LSP array
|
|
* @param prev_lsps array of previous frame's LSPs
|
|
* @param excitation target buffer for excitation signal
|
|
* @param synth target buffer for synthesized speech data
|
|
* @return 0 on success, <0 on error.
|
|
*/
|
|
static int synth_frame(AVCodecContext *ctx, GetBitContext *gb, int frame_idx,
|
|
float *samples,
|
|
const double *lsps, const double *prev_lsps,
|
|
float *excitation, float *synth)
|
|
{
|
|
WMAVoiceContext *s = ctx->priv_data;
|
|
int n, n_blocks_x2, log_n_blocks_x2, av_uninit(cur_pitch_val);
|
|
int pitch[MAX_BLOCKS], av_uninit(last_block_pitch);
|
|
|
|
/* Parse frame type ("frame header"), see frame_descs */
|
|
int bd_idx = s->vbm_tree[get_vlc2(gb, frame_type_vlc.table, 6, 3)], block_nsamples;
|
|
|
|
if (bd_idx < 0) {
|
|
av_log(ctx, AV_LOG_ERROR,
|
|
"Invalid frame type VLC code, skipping\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
block_nsamples = MAX_FRAMESIZE / frame_descs[bd_idx].n_blocks;
|
|
|
|
/* Pitch calculation for ACB_TYPE_ASYMMETRIC ("pitch-per-frame") */
|
|
if (frame_descs[bd_idx].acb_type == ACB_TYPE_ASYMMETRIC) {
|
|
/* Pitch is provided per frame, which is interpreted as the pitch of
|
|
* the last sample of the last block of this frame. We can interpolate
|
|
* the pitch of other blocks (and even pitch-per-sample) by gradually
|
|
* incrementing/decrementing prev_frame_pitch to cur_pitch_val. */
|
|
n_blocks_x2 = frame_descs[bd_idx].n_blocks << 1;
|
|
log_n_blocks_x2 = frame_descs[bd_idx].log_n_blocks + 1;
|
|
cur_pitch_val = s->min_pitch_val + get_bits(gb, s->pitch_nbits);
|
|
cur_pitch_val = FFMIN(cur_pitch_val, s->max_pitch_val - 1);
|
|
if (s->last_acb_type == ACB_TYPE_NONE ||
|
|
20 * abs(cur_pitch_val - s->last_pitch_val) >
|
|
(cur_pitch_val + s->last_pitch_val))
|
|
s->last_pitch_val = cur_pitch_val;
|
|
|
|
/* pitch per block */
|
|
for (n = 0; n < frame_descs[bd_idx].n_blocks; n++) {
|
|
int fac = n * 2 + 1;
|
|
|
|
pitch[n] = (MUL16(fac, cur_pitch_val) +
|
|
MUL16((n_blocks_x2 - fac), s->last_pitch_val) +
|
|
frame_descs[bd_idx].n_blocks) >> log_n_blocks_x2;
|
|
}
|
|
|
|
/* "pitch-diff-per-sample" for calculation of pitch per sample */
|
|
s->pitch_diff_sh16 =
|
|
((cur_pitch_val - s->last_pitch_val) << 16) / MAX_FRAMESIZE;
|
|
}
|
|
|
|
/* Global gain (if silence) and pitch-adaptive window coordinates */
|
|
switch (frame_descs[bd_idx].fcb_type) {
|
|
case FCB_TYPE_SILENCE:
|
|
s->silence_gain = wmavoice_gain_silence[get_bits(gb, 8)];
|
|
break;
|
|
case FCB_TYPE_AW_PULSES:
|
|
aw_parse_coords(s, gb, pitch);
|
|
break;
|
|
}
|
|
|
|
for (n = 0; n < frame_descs[bd_idx].n_blocks; n++) {
|
|
int bl_pitch_sh2;
|
|
|
|
/* Pitch calculation for ACB_TYPE_HAMMING ("pitch-per-block") */
|
|
switch (frame_descs[bd_idx].acb_type) {
|
|
case ACB_TYPE_HAMMING: {
|
|
/* Pitch is given per block. Per-block pitches are encoded as an
|
|
* absolute value for the first block, and then delta values
|
|
* relative to this value) for all subsequent blocks. The scale of
|
|
* this pitch value is semi-logaritmic compared to its use in the
|
|
* decoder, so we convert it to normal scale also. */
|
|
int block_pitch,
|
|
t1 = (s->block_conv_table[1] - s->block_conv_table[0]) << 2,
|
|
t2 = (s->block_conv_table[2] - s->block_conv_table[1]) << 1,
|
|
t3 = s->block_conv_table[3] - s->block_conv_table[2] + 1;
|
|
|
|
if (n == 0) {
|
|
block_pitch = get_bits(gb, s->block_pitch_nbits);
|
|
} else
|
|
block_pitch = last_block_pitch - s->block_delta_pitch_hrange +
|
|
get_bits(gb, s->block_delta_pitch_nbits);
|
|
/* Convert last_ so that any next delta is within _range */
|
|
last_block_pitch = av_clip(block_pitch,
|
|
s->block_delta_pitch_hrange,
|
|
s->block_pitch_range -
|
|
s->block_delta_pitch_hrange);
|
|
|
|
/* Convert semi-log-style scale back to normal scale */
|
|
if (block_pitch < t1) {
|
|
bl_pitch_sh2 = (s->block_conv_table[0] << 2) + block_pitch;
|
|
} else {
|
|
block_pitch -= t1;
|
|
if (block_pitch < t2) {
|
|
bl_pitch_sh2 =
|
|
(s->block_conv_table[1] << 2) + (block_pitch << 1);
|
|
} else {
|
|
block_pitch -= t2;
|
|
if (block_pitch < t3) {
|
|
bl_pitch_sh2 =
|
|
(s->block_conv_table[2] + block_pitch) << 2;
|
|
} else
|
|
bl_pitch_sh2 = s->block_conv_table[3] << 2;
|
|
}
|
|
}
|
|
pitch[n] = bl_pitch_sh2 >> 2;
|
|
break;
|
|
}
|
|
|
|
case ACB_TYPE_ASYMMETRIC: {
|
|
bl_pitch_sh2 = pitch[n] << 2;
|
|
break;
|
|
}
|
|
|
|
default: // ACB_TYPE_NONE has no pitch
|
|
bl_pitch_sh2 = 0;
|
|
break;
|
|
}
|
|
|
|
synth_block(s, gb, n, block_nsamples, bl_pitch_sh2,
|
|
lsps, prev_lsps, &frame_descs[bd_idx],
|
|
&excitation[n * block_nsamples],
|
|
&synth[n * block_nsamples]);
|
|
}
|
|
|
|
/* Averaging projection filter, if applicable. Else, just copy samples
|
|
* from synthesis buffer */
|
|
if (s->do_apf) {
|
|
double i_lsps[MAX_LSPS];
|
|
float lpcs[MAX_LSPS];
|
|
|
|
for (n = 0; n < s->lsps; n++) // LSF -> LSP
|
|
i_lsps[n] = cos(0.5 * (prev_lsps[n] + lsps[n]));
|
|
ff_acelp_lspd2lpc(i_lsps, lpcs, s->lsps >> 1);
|
|
postfilter(s, synth, samples, 80, lpcs,
|
|
&s->zero_exc_pf[s->history_nsamples + MAX_FRAMESIZE * frame_idx],
|
|
frame_descs[bd_idx].fcb_type, pitch[0]);
|
|
|
|
for (n = 0; n < s->lsps; n++) // LSF -> LSP
|
|
i_lsps[n] = cos(lsps[n]);
|
|
ff_acelp_lspd2lpc(i_lsps, lpcs, s->lsps >> 1);
|
|
postfilter(s, &synth[80], &samples[80], 80, lpcs,
|
|
&s->zero_exc_pf[s->history_nsamples + MAX_FRAMESIZE * frame_idx + 80],
|
|
frame_descs[bd_idx].fcb_type, pitch[0]);
|
|
} else
|
|
memcpy(samples, synth, 160 * sizeof(synth[0]));
|
|
|
|
/* Cache values for next frame */
|
|
s->frame_cntr++;
|
|
if (s->frame_cntr >= 0xFFFF) s->frame_cntr -= 0xFFFF; // i.e. modulo (%)
|
|
s->last_acb_type = frame_descs[bd_idx].acb_type;
|
|
switch (frame_descs[bd_idx].acb_type) {
|
|
case ACB_TYPE_NONE:
|
|
s->last_pitch_val = 0;
|
|
break;
|
|
case ACB_TYPE_ASYMMETRIC:
|
|
s->last_pitch_val = cur_pitch_val;
|
|
break;
|
|
case ACB_TYPE_HAMMING:
|
|
s->last_pitch_val = pitch[frame_descs[bd_idx].n_blocks - 1];
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Ensure minimum value for first item, maximum value for last value,
|
|
* proper spacing between each value and proper ordering.
|
|
*
|
|
* @param lsps array of LSPs
|
|
* @param num size of LSP array
|
|
*
|
|
* @note basically a double version of #ff_acelp_reorder_lsf(), might be
|
|
* useful to put in a generic location later on. Parts are also
|
|
* present in #ff_set_min_dist_lsf() + #ff_sort_nearly_sorted_floats(),
|
|
* which is in float.
|
|
*/
|
|
static void stabilize_lsps(double *lsps, int num)
|
|
{
|
|
int n, m, l;
|
|
|
|
/* set minimum value for first, maximum value for last and minimum
|
|
* spacing between LSF values.
|
|
* Very similar to ff_set_min_dist_lsf(), but in double. */
|
|
lsps[0] = FFMAX(lsps[0], 0.0015 * M_PI);
|
|
for (n = 1; n < num; n++)
|
|
lsps[n] = FFMAX(lsps[n], lsps[n - 1] + 0.0125 * M_PI);
|
|
lsps[num - 1] = FFMIN(lsps[num - 1], 0.9985 * M_PI);
|
|
|
|
/* reorder (looks like one-time / non-recursed bubblesort).
|
|
* Very similar to ff_sort_nearly_sorted_floats(), but in double. */
|
|
for (n = 1; n < num; n++) {
|
|
if (lsps[n] < lsps[n - 1]) {
|
|
for (m = 1; m < num; m++) {
|
|
double tmp = lsps[m];
|
|
for (l = m - 1; l >= 0; l--) {
|
|
if (lsps[l] <= tmp) break;
|
|
lsps[l + 1] = lsps[l];
|
|
}
|
|
lsps[l + 1] = tmp;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Test if there's enough bits to read 1 superframe.
|
|
*
|
|
* @param orig_gb bit I/O context used for reading. This function
|
|
* does not modify the state of the bitreader; it
|
|
* only uses it to copy the current stream position
|
|
* @param s WMA Voice decoding context private data
|
|
* @return < 0 on error, 1 on not enough bits or 0 if OK.
|
|
*/
|
|
static int check_bits_for_superframe(GetBitContext *orig_gb,
|
|
WMAVoiceContext *s)
|
|
{
|
|
GetBitContext s_gb, *gb = &s_gb;
|
|
int n, need_bits, bd_idx;
|
|
const struct frame_type_desc *frame_desc;
|
|
|
|
/* initialize a copy */
|
|
init_get_bits(gb, orig_gb->buffer, orig_gb->size_in_bits);
|
|
skip_bits_long(gb, get_bits_count(orig_gb));
|
|
av_assert1(get_bits_left(gb) == get_bits_left(orig_gb));
|
|
|
|
/* superframe header */
|
|
if (get_bits_left(gb) < 14)
|
|
return 1;
|
|
if (!get_bits1(gb))
|
|
return AVERROR(ENOSYS); // WMAPro-in-WMAVoice superframe
|
|
if (get_bits1(gb)) skip_bits(gb, 12); // number of samples in superframe
|
|
if (s->has_residual_lsps) { // residual LSPs (for all frames)
|
|
if (get_bits_left(gb) < s->sframe_lsp_bitsize)
|
|
return 1;
|
|
skip_bits_long(gb, s->sframe_lsp_bitsize);
|
|
}
|
|
|
|
/* frames */
|
|
for (n = 0; n < MAX_FRAMES; n++) {
|
|
int aw_idx_is_ext = 0;
|
|
|
|
if (!s->has_residual_lsps) { // independent LSPs (per-frame)
|
|
if (get_bits_left(gb) < s->frame_lsp_bitsize) return 1;
|
|
skip_bits_long(gb, s->frame_lsp_bitsize);
|
|
}
|
|
bd_idx = s->vbm_tree[get_vlc2(gb, frame_type_vlc.table, 6, 3)];
|
|
if (bd_idx < 0)
|
|
return AVERROR_INVALIDDATA; // invalid frame type VLC code
|
|
frame_desc = &frame_descs[bd_idx];
|
|
if (frame_desc->acb_type == ACB_TYPE_ASYMMETRIC) {
|
|
if (get_bits_left(gb) < s->pitch_nbits)
|
|
return 1;
|
|
skip_bits_long(gb, s->pitch_nbits);
|
|
}
|
|
if (frame_desc->fcb_type == FCB_TYPE_SILENCE) {
|
|
skip_bits(gb, 8);
|
|
} else if (frame_desc->fcb_type == FCB_TYPE_AW_PULSES) {
|
|
int tmp = get_bits(gb, 6);
|
|
if (tmp >= 0x36) {
|
|
skip_bits(gb, 2);
|
|
aw_idx_is_ext = 1;
|
|
}
|
|
}
|
|
|
|
/* blocks */
|
|
if (frame_desc->acb_type == ACB_TYPE_HAMMING) {
|
|
need_bits = s->block_pitch_nbits +
|
|
(frame_desc->n_blocks - 1) * s->block_delta_pitch_nbits;
|
|
} else if (frame_desc->fcb_type == FCB_TYPE_AW_PULSES) {
|
|
need_bits = 2 * !aw_idx_is_ext;
|
|
} else
|
|
need_bits = 0;
|
|
need_bits += frame_desc->frame_size;
|
|
if (get_bits_left(gb) < need_bits)
|
|
return 1;
|
|
skip_bits_long(gb, need_bits);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Synthesize output samples for a single superframe. If we have any data
|
|
* cached in s->sframe_cache, that will be used instead of whatever is loaded
|
|
* in s->gb.
|
|
*
|
|
* WMA Voice superframes contain 3 frames, each containing 160 audio samples,
|
|
* to give a total of 480 samples per frame. See #synth_frame() for frame
|
|
* parsing. In addition to 3 frames, superframes can also contain the LSPs
|
|
* (if these are globally specified for all frames (residually); they can
|
|
* also be specified individually per-frame. See the s->has_residual_lsps
|
|
* option), and can specify the number of samples encoded in this superframe
|
|
* (if less than 480), usually used to prevent blanks at track boundaries.
|
|
*
|
|
* @param ctx WMA Voice decoder context
|
|
* @return 0 on success, <0 on error or 1 if there was not enough data to
|
|
* fully parse the superframe
|
|
*/
|
|
static int synth_superframe(AVCodecContext *ctx, AVFrame *frame,
|
|
int *got_frame_ptr)
|
|
{
|
|
WMAVoiceContext *s = ctx->priv_data;
|
|
GetBitContext *gb = &s->gb, s_gb;
|
|
int n, res, n_samples = 480;
|
|
double lsps[MAX_FRAMES][MAX_LSPS];
|
|
const double *mean_lsf = s->lsps == 16 ?
|
|
wmavoice_mean_lsf16[s->lsp_def_mode] : wmavoice_mean_lsf10[s->lsp_def_mode];
|
|
float excitation[MAX_SIGNAL_HISTORY + MAX_SFRAMESIZE + 12];
|
|
float synth[MAX_LSPS + MAX_SFRAMESIZE];
|
|
float *samples;
|
|
|
|
memcpy(synth, s->synth_history,
|
|
s->lsps * sizeof(*synth));
|
|
memcpy(excitation, s->excitation_history,
|
|
s->history_nsamples * sizeof(*excitation));
|
|
|
|
if (s->sframe_cache_size > 0) {
|
|
gb = &s_gb;
|
|
init_get_bits(gb, s->sframe_cache, s->sframe_cache_size);
|
|
s->sframe_cache_size = 0;
|
|
}
|
|
|
|
if ((res = check_bits_for_superframe(gb, s)) == 1) {
|
|
*got_frame_ptr = 0;
|
|
return 1;
|
|
} else if (res < 0)
|
|
return res;
|
|
|
|
/* First bit is speech/music bit, it differentiates between WMAVoice
|
|
* speech samples (the actual codec) and WMAVoice music samples, which
|
|
* are really WMAPro-in-WMAVoice-superframes. I've never seen those in
|
|
* the wild yet. */
|
|
if (!get_bits1(gb)) {
|
|
avpriv_request_sample(ctx, "WMAPro-in-WMAVoice");
|
|
return AVERROR_PATCHWELCOME;
|
|
}
|
|
|
|
/* (optional) nr. of samples in superframe; always <= 480 and >= 0 */
|
|
if (get_bits1(gb)) {
|
|
if ((n_samples = get_bits(gb, 12)) > 480) {
|
|
av_log(ctx, AV_LOG_ERROR,
|
|
"Superframe encodes >480 samples (%d), not allowed\n",
|
|
n_samples);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
}
|
|
/* Parse LSPs, if global for the superframe (can also be per-frame). */
|
|
if (s->has_residual_lsps) {
|
|
double prev_lsps[MAX_LSPS], a1[MAX_LSPS * 2], a2[MAX_LSPS * 2];
|
|
|
|
for (n = 0; n < s->lsps; n++)
|
|
prev_lsps[n] = s->prev_lsps[n] - mean_lsf[n];
|
|
|
|
if (s->lsps == 10) {
|
|
dequant_lsp10r(gb, lsps[2], prev_lsps, a1, a2, s->lsp_q_mode);
|
|
} else /* s->lsps == 16 */
|
|
dequant_lsp16r(gb, lsps[2], prev_lsps, a1, a2, s->lsp_q_mode);
|
|
|
|
for (n = 0; n < s->lsps; n++) {
|
|
lsps[0][n] = mean_lsf[n] + (a1[n] - a2[n * 2]);
|
|
lsps[1][n] = mean_lsf[n] + (a1[s->lsps + n] - a2[n * 2 + 1]);
|
|
lsps[2][n] += mean_lsf[n];
|
|
}
|
|
for (n = 0; n < 3; n++)
|
|
stabilize_lsps(lsps[n], s->lsps);
|
|
}
|
|
|
|
/* get output buffer */
|
|
frame->nb_samples = 480;
|
|
if ((res = ff_get_buffer(ctx, frame, 0)) < 0)
|
|
return res;
|
|
frame->nb_samples = n_samples;
|
|
samples = (float *)frame->data[0];
|
|
|
|
/* Parse frames, optionally preceded by per-frame (independent) LSPs. */
|
|
for (n = 0; n < 3; n++) {
|
|
if (!s->has_residual_lsps) {
|
|
int m;
|
|
|
|
if (s->lsps == 10) {
|
|
dequant_lsp10i(gb, lsps[n]);
|
|
} else /* s->lsps == 16 */
|
|
dequant_lsp16i(gb, lsps[n]);
|
|
|
|
for (m = 0; m < s->lsps; m++)
|
|
lsps[n][m] += mean_lsf[m];
|
|
stabilize_lsps(lsps[n], s->lsps);
|
|
}
|
|
|
|
if ((res = synth_frame(ctx, gb, n,
|
|
&samples[n * MAX_FRAMESIZE],
|
|
lsps[n], n == 0 ? s->prev_lsps : lsps[n - 1],
|
|
&excitation[s->history_nsamples + n * MAX_FRAMESIZE],
|
|
&synth[s->lsps + n * MAX_FRAMESIZE]))) {
|
|
*got_frame_ptr = 0;
|
|
return res;
|
|
}
|
|
}
|
|
|
|
/* Statistics? FIXME - we don't check for length, a slight overrun
|
|
* will be caught by internal buffer padding, and anything else
|
|
* will be skipped, not read. */
|
|
if (get_bits1(gb)) {
|
|
res = get_bits(gb, 4);
|
|
skip_bits(gb, 10 * (res + 1));
|
|
}
|
|
|
|
*got_frame_ptr = 1;
|
|
|
|
/* Update history */
|
|
memcpy(s->prev_lsps, lsps[2],
|
|
s->lsps * sizeof(*s->prev_lsps));
|
|
memcpy(s->synth_history, &synth[MAX_SFRAMESIZE],
|
|
s->lsps * sizeof(*synth));
|
|
memcpy(s->excitation_history, &excitation[MAX_SFRAMESIZE],
|
|
s->history_nsamples * sizeof(*excitation));
|
|
if (s->do_apf)
|
|
memmove(s->zero_exc_pf, &s->zero_exc_pf[MAX_SFRAMESIZE],
|
|
s->history_nsamples * sizeof(*s->zero_exc_pf));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Parse the packet header at the start of each packet (input data to this
|
|
* decoder).
|
|
*
|
|
* @param s WMA Voice decoding context private data
|
|
* @return 1 if not enough bits were available, or 0 on success.
|
|
*/
|
|
static int parse_packet_header(WMAVoiceContext *s)
|
|
{
|
|
GetBitContext *gb = &s->gb;
|
|
unsigned int res;
|
|
|
|
if (get_bits_left(gb) < 11)
|
|
return 1;
|
|
skip_bits(gb, 4); // packet sequence number
|
|
s->has_residual_lsps = get_bits1(gb);
|
|
do {
|
|
res = get_bits(gb, 6); // number of superframes per packet
|
|
// (minus first one if there is spillover)
|
|
if (get_bits_left(gb) < 6 * (res == 0x3F) + s->spillover_bitsize)
|
|
return 1;
|
|
} while (res == 0x3F);
|
|
s->spillover_nbits = get_bits(gb, s->spillover_bitsize);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Copy (unaligned) bits from gb/data/size to pb.
|
|
*
|
|
* @param pb target buffer to copy bits into
|
|
* @param data source buffer to copy bits from
|
|
* @param size size of the source data, in bytes
|
|
* @param gb bit I/O context specifying the current position in the source.
|
|
* data. This function might use this to align the bit position to
|
|
* a whole-byte boundary before calling #avpriv_copy_bits() on aligned
|
|
* source data
|
|
* @param nbits the amount of bits to copy from source to target
|
|
*
|
|
* @note after calling this function, the current position in the input bit
|
|
* I/O context is undefined.
|
|
*/
|
|
static void copy_bits(PutBitContext *pb,
|
|
const uint8_t *data, int size,
|
|
GetBitContext *gb, int nbits)
|
|
{
|
|
int rmn_bytes, rmn_bits;
|
|
|
|
rmn_bits = rmn_bytes = get_bits_left(gb);
|
|
if (rmn_bits < nbits)
|
|
return;
|
|
if (nbits > pb->size_in_bits - put_bits_count(pb))
|
|
return;
|
|
rmn_bits &= 7; rmn_bytes >>= 3;
|
|
if ((rmn_bits = FFMIN(rmn_bits, nbits)) > 0)
|
|
put_bits(pb, rmn_bits, get_bits(gb, rmn_bits));
|
|
avpriv_copy_bits(pb, data + size - rmn_bytes,
|
|
FFMIN(nbits - rmn_bits, rmn_bytes << 3));
|
|
}
|
|
|
|
/**
|
|
* Packet decoding: a packet is anything that the (ASF) demuxer contains,
|
|
* and we expect that the demuxer / application provides it to us as such
|
|
* (else you'll probably get garbage as output). Every packet has a size of
|
|
* ctx->block_align bytes, starts with a packet header (see
|
|
* #parse_packet_header()), and then a series of superframes. Superframe
|
|
* boundaries may exceed packets, i.e. superframes can split data over
|
|
* multiple (two) packets.
|
|
*
|
|
* For more information about frames, see #synth_superframe().
|
|
*/
|
|
static int wmavoice_decode_packet(AVCodecContext *ctx, void *data,
|
|
int *got_frame_ptr, AVPacket *avpkt)
|
|
{
|
|
WMAVoiceContext *s = ctx->priv_data;
|
|
GetBitContext *gb = &s->gb;
|
|
int size, res, pos;
|
|
|
|
/* Packets are sometimes a multiple of ctx->block_align, with a packet
|
|
* header at each ctx->block_align bytes. However, FFmpeg's ASF demuxer
|
|
* feeds us ASF packets, which may concatenate multiple "codec" packets
|
|
* in a single "muxer" packet, so we artificially emulate that by
|
|
* capping the packet size at ctx->block_align. */
|
|
for (size = avpkt->size; size > ctx->block_align; size -= ctx->block_align);
|
|
if (!size) {
|
|
*got_frame_ptr = 0;
|
|
return 0;
|
|
}
|
|
init_get_bits(&s->gb, avpkt->data, size << 3);
|
|
|
|
/* size == ctx->block_align is used to indicate whether we are dealing with
|
|
* a new packet or a packet of which we already read the packet header
|
|
* previously. */
|
|
if (size == ctx->block_align) { // new packet header
|
|
if ((res = parse_packet_header(s)) < 0)
|
|
return res;
|
|
|
|
/* If the packet header specifies a s->spillover_nbits, then we want
|
|
* to push out all data of the previous packet (+ spillover) before
|
|
* continuing to parse new superframes in the current packet. */
|
|
if (s->spillover_nbits > 0) {
|
|
if (s->sframe_cache_size > 0) {
|
|
int cnt = get_bits_count(gb);
|
|
copy_bits(&s->pb, avpkt->data, size, gb, s->spillover_nbits);
|
|
flush_put_bits(&s->pb);
|
|
s->sframe_cache_size += s->spillover_nbits;
|
|
if ((res = synth_superframe(ctx, data, got_frame_ptr)) == 0 &&
|
|
*got_frame_ptr) {
|
|
cnt += s->spillover_nbits;
|
|
s->skip_bits_next = cnt & 7;
|
|
return cnt >> 3;
|
|
} else
|
|
skip_bits_long (gb, s->spillover_nbits - cnt +
|
|
get_bits_count(gb)); // resync
|
|
} else
|
|
skip_bits_long(gb, s->spillover_nbits); // resync
|
|
}
|
|
} else if (s->skip_bits_next)
|
|
skip_bits(gb, s->skip_bits_next);
|
|
|
|
/* Try parsing superframes in current packet */
|
|
s->sframe_cache_size = 0;
|
|
s->skip_bits_next = 0;
|
|
pos = get_bits_left(gb);
|
|
if ((res = synth_superframe(ctx, data, got_frame_ptr)) < 0) {
|
|
return res;
|
|
} else if (*got_frame_ptr) {
|
|
int cnt = get_bits_count(gb);
|
|
s->skip_bits_next = cnt & 7;
|
|
return cnt >> 3;
|
|
} else if ((s->sframe_cache_size = pos) > 0) {
|
|
/* rewind bit reader to start of last (incomplete) superframe... */
|
|
init_get_bits(gb, avpkt->data, size << 3);
|
|
skip_bits_long(gb, (size << 3) - pos);
|
|
av_assert1(get_bits_left(gb) == pos);
|
|
|
|
/* ...and cache it for spillover in next packet */
|
|
init_put_bits(&s->pb, s->sframe_cache, SFRAME_CACHE_MAXSIZE);
|
|
copy_bits(&s->pb, avpkt->data, size, gb, s->sframe_cache_size);
|
|
// FIXME bad - just copy bytes as whole and add use the
|
|
// skip_bits_next field
|
|
}
|
|
|
|
return size;
|
|
}
|
|
|
|
static av_cold int wmavoice_decode_end(AVCodecContext *ctx)
|
|
{
|
|
WMAVoiceContext *s = ctx->priv_data;
|
|
|
|
if (s->do_apf) {
|
|
ff_rdft_end(&s->rdft);
|
|
ff_rdft_end(&s->irdft);
|
|
ff_dct_end(&s->dct);
|
|
ff_dct_end(&s->dst);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold void wmavoice_flush(AVCodecContext *ctx)
|
|
{
|
|
WMAVoiceContext *s = ctx->priv_data;
|
|
int n;
|
|
|
|
s->postfilter_agc = 0;
|
|
s->sframe_cache_size = 0;
|
|
s->skip_bits_next = 0;
|
|
for (n = 0; n < s->lsps; n++)
|
|
s->prev_lsps[n] = M_PI * (n + 1.0) / (s->lsps + 1.0);
|
|
memset(s->excitation_history, 0,
|
|
sizeof(*s->excitation_history) * MAX_SIGNAL_HISTORY);
|
|
memset(s->synth_history, 0,
|
|
sizeof(*s->synth_history) * MAX_LSPS);
|
|
memset(s->gain_pred_err, 0,
|
|
sizeof(s->gain_pred_err));
|
|
|
|
if (s->do_apf) {
|
|
memset(&s->synth_filter_out_buf[MAX_LSPS_ALIGN16 - s->lsps], 0,
|
|
sizeof(*s->synth_filter_out_buf) * s->lsps);
|
|
memset(s->dcf_mem, 0,
|
|
sizeof(*s->dcf_mem) * 2);
|
|
memset(s->zero_exc_pf, 0,
|
|
sizeof(*s->zero_exc_pf) * s->history_nsamples);
|
|
memset(s->denoise_filter_cache, 0, sizeof(s->denoise_filter_cache));
|
|
}
|
|
}
|
|
|
|
AVCodec ff_wmavoice_decoder = {
|
|
.name = "wmavoice",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio Voice"),
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.id = AV_CODEC_ID_WMAVOICE,
|
|
.priv_data_size = sizeof(WMAVoiceContext),
|
|
.init = wmavoice_decode_init,
|
|
.init_static_data = wmavoice_init_static_data,
|
|
.close = wmavoice_decode_end,
|
|
.decode = wmavoice_decode_packet,
|
|
.capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1,
|
|
.flush = wmavoice_flush,
|
|
};
|