164 lines
5.9 KiB
C
164 lines
5.9 KiB
C
/*
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* TAK decoder/demuxer common code
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* Copyright (c) 2012 Paul B Mahol
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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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* TAK (Tom's lossless Audio Kompressor) decoder/demuxer common functions
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*/
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#ifndef AVCODEC_TAK_H
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#define AVCODEC_TAK_H
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#include <stdint.h>
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#define BITSTREAM_READER_LE
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#include "get_bits.h"
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#include "avcodec.h"
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#define TAK_FORMAT_DATA_TYPE_BITS 3
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#define TAK_FORMAT_SAMPLE_RATE_BITS 18
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#define TAK_FORMAT_BPS_BITS 5
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#define TAK_FORMAT_CHANNEL_BITS 4
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#define TAK_FORMAT_VALID_BITS 5
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#define TAK_FORMAT_CH_LAYOUT_BITS 6
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#define TAK_SIZE_FRAME_DURATION_BITS 4
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#define TAK_SIZE_SAMPLES_NUM_BITS 35
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#define TAK_LAST_FRAME_POS_BITS 40
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#define TAK_LAST_FRAME_SIZE_BITS 24
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#define TAK_ENCODER_CODEC_BITS 6
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#define TAK_ENCODER_PROFILE_BITS 4
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#define TAK_ENCODER_VERSION_BITS 24
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#define TAK_SAMPLE_RATE_MIN 6000
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#define TAK_CHANNELS_MIN 1
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#define TAK_BPS_MIN 8
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#define TAK_FRAME_HEADER_FLAGS_BITS 3
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#define TAK_FRAME_HEADER_SYNC_ID 0xA0FF
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#define TAK_FRAME_HEADER_SYNC_ID_BITS 16
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#define TAK_FRAME_HEADER_SAMPLE_COUNT_BITS 14
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#define TAK_FRAME_HEADER_NO_BITS 21
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#define TAK_FRAME_DURATION_QUANT_SHIFT 5
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#define TAK_CRC24_BITS 24
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#define TAK_FRAME_FLAG_IS_LAST 0x1
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#define TAK_FRAME_FLAG_HAS_INFO 0x2
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#define TAK_FRAME_FLAG_HAS_METADATA 0x4
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#define TAK_MAX_CHANNELS (1 << TAK_FORMAT_CHANNEL_BITS)
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#define TAK_MIN_FRAME_HEADER_BITS (TAK_FRAME_HEADER_SYNC_ID_BITS + \
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TAK_FRAME_HEADER_FLAGS_BITS + \
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TAK_FRAME_HEADER_NO_BITS + \
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TAK_CRC24_BITS)
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#define TAK_MIN_FRAME_HEADER_LAST_BITS (TAK_MIN_FRAME_HEADER_BITS + 2 + \
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TAK_FRAME_HEADER_SAMPLE_COUNT_BITS)
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#define TAK_ENCODER_BITS (TAK_ENCODER_CODEC_BITS + \
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TAK_ENCODER_PROFILE_BITS)
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#define TAK_SIZE_BITS (TAK_SIZE_SAMPLES_NUM_BITS + \
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TAK_SIZE_FRAME_DURATION_BITS)
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#define TAK_FORMAT_BITS (TAK_FORMAT_DATA_TYPE_BITS + \
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TAK_FORMAT_SAMPLE_RATE_BITS + \
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TAK_FORMAT_BPS_BITS + \
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TAK_FORMAT_CHANNEL_BITS + 1 + \
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TAK_FORMAT_VALID_BITS + 1 + \
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TAK_FORMAT_CH_LAYOUT_BITS * \
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TAK_MAX_CHANNELS)
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#define TAK_STREAMINFO_BITS (TAK_ENCODER_BITS + \
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TAK_SIZE_BITS + \
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TAK_FORMAT_BITS)
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#define TAK_MAX_FRAME_HEADER_BITS (TAK_MIN_FRAME_HEADER_LAST_BITS + \
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TAK_STREAMINFO_BITS + 31)
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#define TAK_STREAMINFO_BYTES ((TAK_STREAMINFO_BITS + 7) / 8)
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#define TAK_MAX_FRAME_HEADER_BYTES ((TAK_MAX_FRAME_HEADER_BITS + 7) / 8)
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#define TAK_MIN_FRAME_HEADER_BYTES ((TAK_MIN_FRAME_HEADER_BITS + 7) / 8)
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enum TAKCodecType {
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TAK_CODEC_MONO_STEREO = 2,
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TAK_CODEC_MULTICHANNEL = 4,
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};
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enum TAKMetaDataType {
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TAK_METADATA_END = 0,
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TAK_METADATA_STREAMINFO,
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TAK_METADATA_SEEKTABLE,
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TAK_METADATA_SIMPLE_WAVE_DATA,
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TAK_METADATA_ENCODER,
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TAK_METADATA_PADDING,
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TAK_METADATA_MD5,
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TAK_METADATA_LAST_FRAME,
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};
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enum TAKFrameSizeType {
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TAK_FST_94ms = 0,
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TAK_FST_125ms,
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TAK_FST_188ms,
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TAK_FST_250ms,
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TAK_FST_4096,
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TAK_FST_8192,
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TAK_FST_16384,
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TAK_FST_512,
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TAK_FST_1024,
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TAK_FST_2048,
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};
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typedef struct TAKStreamInfo {
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int flags;
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enum TAKCodecType codec;
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int data_type;
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int sample_rate;
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int channels;
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int bps;
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int frame_num;
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int frame_samples;
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int last_frame_samples;
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uint64_t ch_layout;
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int64_t samples;
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} TAKStreamInfo;
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int ff_tak_check_crc(const uint8_t *buf, unsigned int buf_size);
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/**
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* Parse the Streaminfo metadata block.
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* @param[in] gb pointer to GetBitContext
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* @param[out] s storage for parsed information
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*/
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void avpriv_tak_parse_streaminfo(GetBitContext *gb, TAKStreamInfo *s);
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/**
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* Validate and decode a frame header.
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* @param avctx AVCodecContext to use as av_log() context
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* @param[in] gb GetBitContext from which to read frame header
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* @param[out] s frame information
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* @param log_level_offset log level offset, can be used to silence
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* error messages.
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* @return non-zero on error, 0 if OK
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*/
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int ff_tak_decode_frame_header(AVCodecContext *avctx, GetBitContext *gb,
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TAKStreamInfo *s, int log_level_offset);
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#endif /* AVCODEC_TAK_H */
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