forked from KolibriOS/kolibrios
199 lines
6.3 KiB
C
199 lines
6.3 KiB
C
/*
|
|
* TwinVQ decoder
|
|
* Copyright (c) 2009 Vitor Sessak
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef AVCODEC_TWINVQ_H
|
|
#define AVCODEC_TWINVQ_H
|
|
|
|
#include <math.h>
|
|
#include <stdint.h>
|
|
|
|
#include "libavutil/common.h"
|
|
#include "libavutil/float_dsp.h"
|
|
#include "avcodec.h"
|
|
#include "fft.h"
|
|
#include "internal.h"
|
|
|
|
enum TwinVQCodec {
|
|
TWINVQ_CODEC_VQF,
|
|
TWINVQ_CODEC_METASOUND,
|
|
};
|
|
|
|
enum TwinVQFrameType {
|
|
TWINVQ_FT_SHORT = 0, ///< Short frame (divided in n sub-blocks)
|
|
TWINVQ_FT_MEDIUM, ///< Medium frame (divided in m<n sub-blocks)
|
|
TWINVQ_FT_LONG, ///< Long frame (single sub-block + PPC)
|
|
TWINVQ_FT_PPC, ///< Periodic Peak Component (part of the long frame)
|
|
};
|
|
|
|
#define TWINVQ_PPC_SHAPE_CB_SIZE 64
|
|
#define TWINVQ_PPC_SHAPE_LEN_MAX 60
|
|
#define TWINVQ_SUB_AMP_MAX 4500.0
|
|
#define TWINVQ_MULAW_MU 100.0
|
|
#define TWINVQ_GAIN_BITS 8
|
|
#define TWINVQ_AMP_MAX 13000.0
|
|
#define TWINVQ_SUB_GAIN_BITS 5
|
|
#define TWINVQ_WINDOW_TYPE_BITS 4
|
|
#define TWINVQ_PGAIN_MU 200
|
|
#define TWINVQ_LSP_COEFS_MAX 20
|
|
#define TWINVQ_LSP_SPLIT_MAX 4
|
|
#define TWINVQ_CHANNELS_MAX 2
|
|
#define TWINVQ_SUBBLOCKS_MAX 16
|
|
#define TWINVQ_BARK_N_COEF_MAX 4
|
|
|
|
/**
|
|
* Parameters and tables that are different for each frame type
|
|
*/
|
|
struct TwinVQFrameMode {
|
|
uint8_t sub; ///< Number subblocks in each frame
|
|
const uint16_t *bark_tab;
|
|
|
|
/** number of distinct bark scale envelope values */
|
|
uint8_t bark_env_size;
|
|
|
|
const int16_t *bark_cb; ///< codebook for the bark scale envelope (BSE)
|
|
uint8_t bark_n_coef;///< number of BSE CB coefficients to read
|
|
uint8_t bark_n_bit; ///< number of bits of the BSE coefs
|
|
|
|
//@{
|
|
/** main codebooks for spectrum data */
|
|
const int16_t *cb0;
|
|
const int16_t *cb1;
|
|
//@}
|
|
|
|
uint8_t cb_len_read; ///< number of spectrum coefficients to read
|
|
};
|
|
|
|
typedef struct TwinVQFrameData {
|
|
int window_type;
|
|
enum TwinVQFrameType ftype;
|
|
|
|
uint8_t main_coeffs[1024];
|
|
uint8_t ppc_coeffs[TWINVQ_PPC_SHAPE_LEN_MAX];
|
|
|
|
uint8_t gain_bits[TWINVQ_CHANNELS_MAX];
|
|
uint8_t sub_gain_bits[TWINVQ_CHANNELS_MAX * TWINVQ_SUBBLOCKS_MAX];
|
|
|
|
uint8_t bark1[TWINVQ_CHANNELS_MAX][TWINVQ_SUBBLOCKS_MAX][TWINVQ_BARK_N_COEF_MAX];
|
|
uint8_t bark_use_hist[TWINVQ_CHANNELS_MAX][TWINVQ_SUBBLOCKS_MAX];
|
|
|
|
uint8_t lpc_idx1[TWINVQ_CHANNELS_MAX];
|
|
uint8_t lpc_idx2[TWINVQ_CHANNELS_MAX][TWINVQ_LSP_SPLIT_MAX];
|
|
uint8_t lpc_hist_idx[TWINVQ_CHANNELS_MAX];
|
|
|
|
int p_coef[TWINVQ_CHANNELS_MAX];
|
|
int g_coef[TWINVQ_CHANNELS_MAX];
|
|
} TwinVQFrameData;
|
|
|
|
/**
|
|
* Parameters and tables that are different for every combination of
|
|
* bitrate/sample rate
|
|
*/
|
|
typedef struct TwinVQModeTab {
|
|
struct TwinVQFrameMode fmode[3]; ///< frame type-dependant parameters
|
|
|
|
uint16_t size; ///< frame size in samples
|
|
uint8_t n_lsp; ///< number of lsp coefficients
|
|
const float *lspcodebook;
|
|
|
|
/* number of bits of the different LSP CB coefficients */
|
|
uint8_t lsp_bit0;
|
|
uint8_t lsp_bit1;
|
|
uint8_t lsp_bit2;
|
|
|
|
uint8_t lsp_split; ///< number of CB entries for the LSP decoding
|
|
const int16_t *ppc_shape_cb; ///< PPC shape CB
|
|
|
|
/** number of the bits for the PPC period value */
|
|
uint8_t ppc_period_bit;
|
|
|
|
uint8_t ppc_shape_bit; ///< number of bits of the PPC shape CB coeffs
|
|
uint8_t ppc_shape_len; ///< size of PPC shape CB
|
|
uint8_t pgain_bit; ///< bits for PPC gain
|
|
|
|
/** constant for peak period to peak width conversion */
|
|
uint16_t peak_per2wid;
|
|
} TwinVQModeTab;
|
|
|
|
typedef struct TwinVQContext {
|
|
AVCodecContext *avctx;
|
|
AVFloatDSPContext fdsp;
|
|
FFTContext mdct_ctx[3];
|
|
|
|
const TwinVQModeTab *mtab;
|
|
|
|
// history
|
|
float lsp_hist[2][20]; ///< LSP coefficients of the last frame
|
|
float bark_hist[3][2][40]; ///< BSE coefficients of last frame
|
|
|
|
// bitstream parameters
|
|
int16_t permut[4][4096];
|
|
uint8_t length[4][2]; ///< main codebook stride
|
|
uint8_t length_change[4];
|
|
uint8_t bits_main_spec[2][4][2]; ///< bits for the main codebook
|
|
int bits_main_spec_change[4];
|
|
int n_div[4];
|
|
|
|
float *spectrum;
|
|
float *curr_frame; ///< non-interleaved output
|
|
float *prev_frame; ///< non-interleaved previous frame
|
|
int last_block_pos[2];
|
|
int discarded_packets;
|
|
|
|
float *cos_tabs[3];
|
|
|
|
// scratch buffers
|
|
float *tmp_buf;
|
|
|
|
TwinVQFrameData bits;
|
|
|
|
enum TwinVQCodec codec;
|
|
|
|
int (*read_bitstream)(AVCodecContext *avctx, struct TwinVQContext *tctx,
|
|
const uint8_t *buf, int buf_size);
|
|
void (*dec_bark_env)(struct TwinVQContext *tctx, const uint8_t *in,
|
|
int use_hist, int ch, float *out, float gain,
|
|
enum TwinVQFrameType ftype);
|
|
void (*decode_ppc)(struct TwinVQContext *tctx, int period_coef, int g_coef,
|
|
const float *shape, float *speech);
|
|
} TwinVQContext;
|
|
|
|
extern const enum TwinVQFrameType ff_twinvq_wtype_to_ftype_table[];
|
|
|
|
/** @note not speed critical, hence not optimized */
|
|
static inline void twinvq_memset_float(float *buf, float val, int size)
|
|
{
|
|
while (size--)
|
|
*buf++ = val;
|
|
}
|
|
|
|
static inline float twinvq_mulawinv(float y, float clip, float mu)
|
|
{
|
|
y = av_clipf(y / clip, -1, 1);
|
|
return clip * FFSIGN(y) * (exp(log(1 + mu) * fabs(y)) - 1) / mu;
|
|
}
|
|
|
|
int ff_twinvq_decode_frame(AVCodecContext *avctx, void *data,
|
|
int *got_frame_ptr, AVPacket *avpkt);
|
|
av_cold int ff_twinvq_decode_close(AVCodecContext *avctx);
|
|
av_cold int ff_twinvq_decode_init(AVCodecContext *avctx);
|
|
|
|
#endif /* AVCODEC_TWINVQ_DATA_H */
|