libavcodec/tak.c

   1 /*
   2  * TAK 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 #include "libavutil/channel_layout.h"
  23 #include "libavutil/crc.h"
  24 #include "libavutil/intreadwrite.h"
  25
  26 #define CACHED_BITSTREAM_READER !ARCH_X86_32
  27 #define BITSTREAM_READER_LE
  28 #include "tak.h"
  29
  30 static const int64_t tak_channel_layouts[] = {
  31     0,
  32     AV_CH_FRONT_LEFT,
  33     AV_CH_FRONT_RIGHT,
  34     AV_CH_FRONT_CENTER,
  35     AV_CH_LOW_FREQUENCY,
  36     AV_CH_BACK_LEFT,
  37     AV_CH_BACK_RIGHT,
  38     AV_CH_FRONT_LEFT_OF_CENTER,
  39     AV_CH_FRONT_RIGHT_OF_CENTER,
  40     AV_CH_BACK_CENTER,
  41     AV_CH_SIDE_LEFT,
  42     AV_CH_SIDE_RIGHT,
  43     AV_CH_TOP_CENTER,
  44     AV_CH_TOP_FRONT_LEFT,
  45     AV_CH_TOP_FRONT_CENTER,
  46     AV_CH_TOP_FRONT_RIGHT,
  47     AV_CH_TOP_BACK_LEFT,
  48     AV_CH_TOP_BACK_CENTER,
  49     AV_CH_TOP_BACK_RIGHT,
  50 };
  51
  52 static const uint16_t frame_duration_type_quants[] = {
  53     3, 4, 6, 8, 4096, 8192, 16384, 512, 1024, 2048,
  54 };
  55
  56 static int tak_get_nb_samples(int sample_rate, enum TAKFrameSizeType type)
  57 {
  58     int nb_samples, max_nb_samples;
  59
  60     if (type <= TAK_FST_250ms) {
  61         nb_samples     = sample_rate * frame_duration_type_quants[type] >>
  62                          TAK_FRAME_DURATION_QUANT_SHIFT;
  63         max_nb_samples = 16384;
  64     } else if (type < FF_ARRAY_ELEMS(frame_duration_type_quants)) {
  65         nb_samples     = frame_duration_type_quants[type];
  66         max_nb_samples = sample_rate *
  67                          frame_duration_type_quants[TAK_FST_250ms] >>
  68                          TAK_FRAME_DURATION_QUANT_SHIFT;
  69     } else {
  70         return AVERROR_INVALIDDATA;
  71     }
  72
  73     if (nb_samples <= 0 || nb_samples > max_nb_samples)
  74         return AVERROR_INVALIDDATA;
  75
  76     return nb_samples;
  77 }
  78
  79 int ff_tak_check_crc(const uint8_t *buf, unsigned int buf_size)
  80 {
  81     uint32_t crc, CRC;
  82
  83     if (buf_size < 4)
  84         return AVERROR_INVALIDDATA;
  85     buf_size -= 3;
  86
  87     CRC = AV_RB24(buf + buf_size);
  88     crc = av_crc(av_crc_get_table(AV_CRC_24_IEEE), 0xCE04B7U, buf, buf_size);
  89     if (CRC != crc)
  90         return AVERROR_INVALIDDATA;
  91
  92     return 0;
  93 }
  94
  95 static int tak_parse_streaminfo(TAKStreamInfo *s, GetBitContext *gb)
  96 {
  97     uint64_t channel_mask = 0;
  98     int frame_type, i, ret;
  99
 100     s->codec = get_bits(gb, TAK_ENCODER_CODEC_BITS);
 101     skip_bits(gb, TAK_ENCODER_PROFILE_BITS);
 102
 103     frame_type = get_bits(gb, TAK_SIZE_FRAME_DURATION_BITS);
 104     s->samples = get_bits64(gb, TAK_SIZE_SAMPLES_NUM_BITS);
 105
 106     s->data_type   = get_bits(gb, TAK_FORMAT_DATA_TYPE_BITS);
 107     s->sample_rate = get_bits(gb, TAK_FORMAT_SAMPLE_RATE_BITS) +
 108                      TAK_SAMPLE_RATE_MIN;
 109     s->bps         = get_bits(gb, TAK_FORMAT_BPS_BITS) +
 110                      TAK_BPS_MIN;
 111     s->channels    = get_bits(gb, TAK_FORMAT_CHANNEL_BITS) +
 112                      TAK_CHANNELS_MIN;
 113
 114     if (get_bits1(gb)) {
 115         skip_bits(gb, TAK_FORMAT_VALID_BITS);
 116         if (get_bits1(gb)) {
 117             for (i = 0; i < s->channels; i++) {
 118                 int value = get_bits(gb, TAK_FORMAT_CH_LAYOUT_BITS);
 119
 120                 if (value < FF_ARRAY_ELEMS(tak_channel_layouts))
 121                     channel_mask |= tak_channel_layouts[value];
 122             }
 123         }
 124     }
 125
 126     s->ch_layout     = channel_mask;
 127
 128     ret = tak_get_nb_samples(s->sample_rate, frame_type);
 129     if (ret < 0)
 130         return ret;
 131     s->frame_samples = ret;
 132
 133     return 0;
 134 }
 135
 136 int avpriv_tak_parse_streaminfo(TAKStreamInfo *s, const uint8_t *buf, int size)
 137 {
 138     GetBitContext gb;
 139     int ret = init_get_bits8(&gb, buf, size);
 140
 141     if (ret < 0)
 142         return AVERROR_INVALIDDATA;
 143
 144     return tak_parse_streaminfo(s, &gb);
 145 }
 146
 147 int ff_tak_decode_frame_header(void *logctx, GetBitContext *gb,
 148                                TAKStreamInfo *ti, int log_level_offset)
 149 {
 150     if (get_bits(gb, TAK_FRAME_HEADER_SYNC_ID_BITS) != TAK_FRAME_HEADER_SYNC_ID) {
 151         av_log(logctx, AV_LOG_ERROR + log_level_offset, "missing sync id\n");
 152         return AVERROR_INVALIDDATA;
 153     }
 154
 155     ti->flags     = get_bits(gb, TAK_FRAME_HEADER_FLAGS_BITS);
 156     ti->frame_num = get_bits(gb, TAK_FRAME_HEADER_NO_BITS);
 157
 158     if (ti->flags & TAK_FRAME_FLAG_IS_LAST) {
 159         ti->last_frame_samples = get_bits(gb, TAK_FRAME_HEADER_SAMPLE_COUNT_BITS) + 1;
 160         skip_bits(gb, 2);
 161     } else {
 162         ti->last_frame_samples = 0;
 163     }
 164
 165     if (ti->flags & TAK_FRAME_FLAG_HAS_INFO) {
 166         int ret = tak_parse_streaminfo(ti, gb);
 167         if (ret < 0)
 168             return ret;
 169
 170         if (get_bits(gb, 6))
 171             skip_bits(gb, 25);
 172         align_get_bits(gb);
 173     }
 174
 175     if (ti->flags & TAK_FRAME_FLAG_HAS_METADATA)
 176         return AVERROR_INVALIDDATA;
 177
 178     if (get_bits_left(gb) < 24)
 179         return AVERROR_INVALIDDATA;
 180
 181     skip_bits(gb, 24);
 182
 183     return 0;
 184 }