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   1 /*
   2  * TAK decoder/demuxer common code
   3  * Copyright (c) 2012 Paul B Mahol
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav 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  * Libav 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 Libav; 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 void ff_tak_init_crc(void);
 144
 145 int ff_tak_check_crc(const uint8_t *buf, unsigned int buf_size);
 146
 147 /**
 148  * Parse the Streaminfo metadata block.
 149  * @param[in]  gb pointer to GetBitContext
 150  * @param[out] s  storage for parsed information
 151  */
 152 void avpriv_tak_parse_streaminfo(GetBitContext *gb, TAKStreamInfo *s);
 153
 154 /**
 155  * Validate and decode a frame header.
 156  * @param      avctx             AVCodecContext to use as av_log() context
 157  * @param[in]  gb                GetBitContext from which to read frame header
 158  * @param[out] s                 frame information
 159  * @param      log_level_offset  log level offset, can be used to silence
 160  *                               error messages.
 161  * @return non-zero on error, 0 if OK
 162  */
 163 int ff_tak_decode_frame_header(AVCodecContext *avctx, GetBitContext *gb,
 164                                TAKStreamInfo *s, int log_level_offset);
 165
 166 #endif /* AVCODEC_TAK_H */