/* * TAK decoder/demuxer common code * Copyright (c) 2012 Paul B Mahol * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * TAK (Tom's lossless Audio Kompressor) decoder/demuxer common functions */ #ifndef AVCODEC_TAK_H #define AVCODEC_TAK_H #include <stdint.h> #define BITSTREAM_READER_LE #include "get_bits.h" #include "avcodec.h" #define TAK_FORMAT_DATA_TYPE_BITS 3 #define TAK_FORMAT_SAMPLE_RATE_BITS 18 #define TAK_FORMAT_BPS_BITS 5 #define TAK_FORMAT_CHANNEL_BITS 4 #define TAK_FORMAT_VALID_BITS 5 #define TAK_FORMAT_CH_LAYOUT_BITS 6 #define TAK_SIZE_FRAME_DURATION_BITS 4 #define TAK_SIZE_SAMPLES_NUM_BITS 35 #define TAK_LAST_FRAME_POS_BITS 40 #define TAK_LAST_FRAME_SIZE_BITS 24 #define TAK_ENCODER_CODEC_BITS 6 #define TAK_ENCODER_PROFILE_BITS 4 #define TAK_ENCODER_VERSION_BITS 24 #define TAK_SAMPLE_RATE_MIN 6000 #define TAK_CHANNELS_MIN 1 #define TAK_BPS_MIN 8 #define TAK_FRAME_HEADER_FLAGS_BITS 3 #define TAK_FRAME_HEADER_SYNC_ID 0xA0FF #define TAK_FRAME_HEADER_SYNC_ID_BITS 16 #define TAK_FRAME_HEADER_SAMPLE_COUNT_BITS 14 #define TAK_FRAME_HEADER_NO_BITS 21 #define TAK_FRAME_DURATION_QUANT_SHIFT 5 #define TAK_CRC24_BITS 24 #define TAK_FRAME_FLAG_IS_LAST 0x1 #define TAK_FRAME_FLAG_HAS_INFO 0x2 #define TAK_FRAME_FLAG_HAS_METADATA 0x4 #define TAK_MAX_CHANNELS (1 << TAK_FORMAT_CHANNEL_BITS) #define TAK_MIN_FRAME_HEADER_BITS (TAK_FRAME_HEADER_SYNC_ID_BITS + \ TAK_FRAME_HEADER_FLAGS_BITS + \ TAK_FRAME_HEADER_NO_BITS + \ TAK_CRC24_BITS) #define TAK_MIN_FRAME_HEADER_LAST_BITS (TAK_MIN_FRAME_HEADER_BITS + 2 + \ TAK_FRAME_HEADER_SAMPLE_COUNT_BITS) #define TAK_ENCODER_BITS (TAK_ENCODER_CODEC_BITS + \ TAK_ENCODER_PROFILE_BITS) #define TAK_SIZE_BITS (TAK_SIZE_SAMPLES_NUM_BITS + \ TAK_SIZE_FRAME_DURATION_BITS) #define TAK_FORMAT_BITS (TAK_FORMAT_DATA_TYPE_BITS + \ TAK_FORMAT_SAMPLE_RATE_BITS + \ TAK_FORMAT_BPS_BITS + \ TAK_FORMAT_CHANNEL_BITS + 1 + \ TAK_FORMAT_VALID_BITS + 1 + \ TAK_FORMAT_CH_LAYOUT_BITS * \ TAK_MAX_CHANNELS) #define TAK_STREAMINFO_BITS (TAK_ENCODER_BITS + \ TAK_SIZE_BITS + \ TAK_FORMAT_BITS) #define TAK_MAX_FRAME_HEADER_BITS (TAK_MIN_FRAME_HEADER_LAST_BITS + \ TAK_STREAMINFO_BITS + 31) #define TAK_STREAMINFO_BYTES ((TAK_STREAMINFO_BITS + 7) / 8) #define TAK_MAX_FRAME_HEADER_BYTES ((TAK_MAX_FRAME_HEADER_BITS + 7) / 8) #define TAK_MIN_FRAME_HEADER_BYTES ((TAK_MIN_FRAME_HEADER_BITS + 7) / 8) enum TAKCodecType { TAK_CODEC_MONO_STEREO = 2, TAK_CODEC_MULTICHANNEL = 4 }; enum TAKMetaDataType { TAK_METADATA_END = 0, TAK_METADATA_STREAMINFO, TAK_METADATA_SEEKTABLE, TAK_METADATA_SIMPLE_WAVE_DATA, TAK_METADATA_ENCODER, TAK_METADATA_PADDING, TAK_METADATA_MD5, TAK_METADATA_LAST_FRAME, }; enum TAKFrameSizeType { TAK_FST_94ms = 0, TAK_FST_125ms, TAK_FST_188ms, TAK_FST_250ms, TAK_FST_4096, TAK_FST_8192, TAK_FST_16384, TAK_FST_512, TAK_FST_1024, TAK_FST_2048, }; typedef struct TAKStreamInfo { int flags; enum TAKCodecType codec; int data_type; int sample_rate; int channels; int bps; int frame_num; int frame_samples; int last_frame_samples; uint64_t ch_layout; int64_t samples; } TAKStreamInfo; void ff_tak_init_crc(void); int ff_tak_check_crc(const uint8_t *buf, unsigned int buf_size); /** * Parse the Streaminfo metadata block. * @param[in] gb pointer to GetBitContext * @param[out] s storage for parsed information */ void avpriv_tak_parse_streaminfo(GetBitContext *gb, TAKStreamInfo *s); /** * Validate and decode a frame header. * @param avctx AVCodecContext to use as av_log() context * @param[in] gb GetBitContext from which to read frame header * @param[out] s frame information * @param log_level_offset log level offset, can be used to silence * error messages. * @return non-zero on error, 0 if OK */ int ff_tak_decode_frame_header(AVCodecContext *avctx, GetBitContext *gb, TAKStreamInfo *s, int log_level_offset); #endif /* AVCODEC_TAK_H */