| 1 | /* |
| 2 | * TAK decoder/demuxer common code |
| 3 | * Copyright (c) 2012 Paul B Mahol |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | /** |
| 23 | * @file |
| 24 | * TAK (Tom's lossless Audio Kompressor) decoder/demuxer common functions |
| 25 | */ |
| 26 | |
| 27 | #ifndef AVCODEC_TAK_H |
| 28 | #define AVCODEC_TAK_H |
| 29 | |
| 30 | #include <stdint.h> |
| 31 | |
| 32 | #define BITSTREAM_READER_LE |
| 33 | #include "get_bits.h" |
| 34 | #include "avcodec.h" |
| 35 | |
| 36 | #define TAK_FORMAT_DATA_TYPE_BITS 3 |
| 37 | #define TAK_FORMAT_SAMPLE_RATE_BITS 18 |
| 38 | #define TAK_FORMAT_BPS_BITS 5 |
| 39 | #define TAK_FORMAT_CHANNEL_BITS 4 |
| 40 | #define TAK_FORMAT_VALID_BITS 5 |
| 41 | #define TAK_FORMAT_CH_LAYOUT_BITS 6 |
| 42 | #define TAK_SIZE_FRAME_DURATION_BITS 4 |
| 43 | #define TAK_SIZE_SAMPLES_NUM_BITS 35 |
| 44 | #define TAK_LAST_FRAME_POS_BITS 40 |
| 45 | #define TAK_LAST_FRAME_SIZE_BITS 24 |
| 46 | #define TAK_ENCODER_CODEC_BITS 6 |
| 47 | #define TAK_ENCODER_PROFILE_BITS 4 |
| 48 | #define TAK_ENCODER_VERSION_BITS 24 |
| 49 | #define TAK_SAMPLE_RATE_MIN 6000 |
| 50 | #define TAK_CHANNELS_MIN 1 |
| 51 | #define TAK_BPS_MIN 8 |
| 52 | #define TAK_FRAME_HEADER_FLAGS_BITS 3 |
| 53 | #define TAK_FRAME_HEADER_SYNC_ID 0xA0FF |
| 54 | #define TAK_FRAME_HEADER_SYNC_ID_BITS 16 |
| 55 | #define TAK_FRAME_HEADER_SAMPLE_COUNT_BITS 14 |
| 56 | #define TAK_FRAME_HEADER_NO_BITS 21 |
| 57 | #define TAK_FRAME_DURATION_QUANT_SHIFT 5 |
| 58 | #define TAK_CRC24_BITS 24 |
| 59 | |
| 60 | |
| 61 | #define TAK_FRAME_FLAG_IS_LAST 0x1 |
| 62 | #define TAK_FRAME_FLAG_HAS_INFO 0x2 |
| 63 | #define TAK_FRAME_FLAG_HAS_METADATA 0x4 |
| 64 | |
| 65 | #define TAK_MAX_CHANNELS (1 << TAK_FORMAT_CHANNEL_BITS) |
| 66 | |
| 67 | #define TAK_MIN_FRAME_HEADER_BITS (TAK_FRAME_HEADER_SYNC_ID_BITS + \ |
| 68 | TAK_FRAME_HEADER_FLAGS_BITS + \ |
| 69 | TAK_FRAME_HEADER_NO_BITS + \ |
| 70 | TAK_CRC24_BITS) |
| 71 | |
| 72 | #define TAK_MIN_FRAME_HEADER_LAST_BITS (TAK_MIN_FRAME_HEADER_BITS + 2 + \ |
| 73 | TAK_FRAME_HEADER_SAMPLE_COUNT_BITS) |
| 74 | |
| 75 | #define TAK_ENCODER_BITS (TAK_ENCODER_CODEC_BITS + \ |
| 76 | TAK_ENCODER_PROFILE_BITS) |
| 77 | |
| 78 | #define TAK_SIZE_BITS (TAK_SIZE_SAMPLES_NUM_BITS + \ |
| 79 | TAK_SIZE_FRAME_DURATION_BITS) |
| 80 | |
| 81 | #define TAK_FORMAT_BITS (TAK_FORMAT_DATA_TYPE_BITS + \ |
| 82 | TAK_FORMAT_SAMPLE_RATE_BITS + \ |
| 83 | TAK_FORMAT_BPS_BITS + \ |
| 84 | TAK_FORMAT_CHANNEL_BITS + 1 + \ |
| 85 | TAK_FORMAT_VALID_BITS + 1 + \ |
| 86 | TAK_FORMAT_CH_LAYOUT_BITS * \ |
| 87 | TAK_MAX_CHANNELS) |
| 88 | |
| 89 | #define TAK_STREAMINFO_BITS (TAK_ENCODER_BITS + \ |
| 90 | TAK_SIZE_BITS + \ |
| 91 | TAK_FORMAT_BITS) |
| 92 | |
| 93 | #define TAK_MAX_FRAME_HEADER_BITS (TAK_MIN_FRAME_HEADER_LAST_BITS + \ |
| 94 | TAK_STREAMINFO_BITS + 31) |
| 95 | |
| 96 | #define TAK_STREAMINFO_BYTES ((TAK_STREAMINFO_BITS + 7) / 8) |
| 97 | #define TAK_MAX_FRAME_HEADER_BYTES ((TAK_MAX_FRAME_HEADER_BITS + 7) / 8) |
| 98 | #define TAK_MIN_FRAME_HEADER_BYTES ((TAK_MIN_FRAME_HEADER_BITS + 7) / 8) |
| 99 | |
| 100 | enum TAKCodecType { |
| 101 | TAK_CODEC_MONO_STEREO = 2, |
| 102 | TAK_CODEC_MULTICHANNEL = 4, |
| 103 | }; |
| 104 | |
| 105 | enum TAKMetaDataType { |
| 106 | TAK_METADATA_END = 0, |
| 107 | TAK_METADATA_STREAMINFO, |
| 108 | TAK_METADATA_SEEKTABLE, |
| 109 | TAK_METADATA_SIMPLE_WAVE_DATA, |
| 110 | TAK_METADATA_ENCODER, |
| 111 | TAK_METADATA_PADDING, |
| 112 | TAK_METADATA_MD5, |
| 113 | TAK_METADATA_LAST_FRAME, |
| 114 | }; |
| 115 | |
| 116 | enum TAKFrameSizeType { |
| 117 | TAK_FST_94ms = 0, |
| 118 | TAK_FST_125ms, |
| 119 | TAK_FST_188ms, |
| 120 | TAK_FST_250ms, |
| 121 | TAK_FST_4096, |
| 122 | TAK_FST_8192, |
| 123 | TAK_FST_16384, |
| 124 | TAK_FST_512, |
| 125 | TAK_FST_1024, |
| 126 | TAK_FST_2048, |
| 127 | }; |
| 128 | |
| 129 | typedef struct TAKStreamInfo { |
| 130 | int flags; |
| 131 | enum TAKCodecType codec; |
| 132 | int data_type; |
| 133 | int sample_rate; |
| 134 | int channels; |
| 135 | int bps; |
| 136 | int frame_num; |
| 137 | int frame_samples; |
| 138 | int last_frame_samples; |
| 139 | uint64_t ch_layout; |
| 140 | int64_t samples; |
| 141 | } TAKStreamInfo; |
| 142 | |
| 143 | int ff_tak_check_crc(const uint8_t *buf, unsigned int buf_size); |
| 144 | |
| 145 | /** |
| 146 | * Parse the Streaminfo metadata block. |
| 147 | * @param[in] gb pointer to GetBitContext |
| 148 | * @param[out] s storage for parsed information |
| 149 | */ |
| 150 | void avpriv_tak_parse_streaminfo(GetBitContext *gb, TAKStreamInfo *s); |
| 151 | |
| 152 | /** |
| 153 | * Validate and decode a frame header. |
| 154 | * @param avctx AVCodecContext to use as av_log() context |
| 155 | * @param[in] gb GetBitContext from which to read frame header |
| 156 | * @param[out] s frame information |
| 157 | * @param log_level_offset log level offset, can be used to silence |
| 158 | * error messages. |
| 159 | * @return non-zero on error, 0 if OK |
| 160 | */ |
| 161 | int ff_tak_decode_frame_header(AVCodecContext *avctx, GetBitContext *gb, |
| 162 | TAKStreamInfo *s, int log_level_offset); |
| 163 | #endif /* AVCODEC_TAK_H */ |