ffmpeg/libavcodec/pcm-bluray.c

   1 /*
   2  * LPCM codecs for PCM format found in Blu-ray PCM streams
   3  * Copyright (c) 2009, 2013 Christian Schmidt
   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  * PCM codec for Blu-ray PCM audio tracks
  25  */
  26
  27 #include "libavutil/channel_layout.h"
  28 #include "avcodec.h"
  29 #include "bytestream.h"
  30 #include "internal.h"
  31
  32 /*
  33  * Channel Mapping according to
  34  * Blu-ray Disc Read-Only Format Version 1
  35  * Part 3: Audio Visual Basic Specifications
  36  * mono     M1    X
  37  * stereo   L     R
  38  * 3/0      L     R    C    X
  39  * 2/1      L     R    S    X
  40  * 3/1      L     R    C    S
  41  * 2/2      L     R    LS   RS
  42  * 3/2      L     R    C    LS    RS    X
  43  * 3/2+lfe  L     R    C    LS    RS    lfe
  44  * 3/4      L     R    C    LS    Rls   Rrs  RS   X
  45  * 3/4+lfe  L     R    C    LS    Rls   Rrs  RS   lfe
  46  */
  47
  48 /**
  49  * Parse the header of a LPCM frame read from a Blu-ray MPEG-TS stream
  50  * @param avctx the codec context
  51  * @param header pointer to the first four bytes of the data packet
  52  */
  53 static int pcm_bluray_parse_header(AVCodecContext *avctx,
  54                                    const uint8_t *header)
  55 {
  56     static const uint8_t bits_per_samples[4] = { 0, 16, 20, 24 };
  57     static const uint32_t channel_layouts[16] = {
  58         0, AV_CH_LAYOUT_MONO, 0, AV_CH_LAYOUT_STEREO, AV_CH_LAYOUT_SURROUND,
  59         AV_CH_LAYOUT_2_1, AV_CH_LAYOUT_4POINT0, AV_CH_LAYOUT_2_2,
  60         AV_CH_LAYOUT_5POINT0, AV_CH_LAYOUT_5POINT1, AV_CH_LAYOUT_7POINT0,
  61         AV_CH_LAYOUT_7POINT1, 0, 0, 0, 0
  62     };
  63     static const uint8_t channels[16] = {
  64         0, 1, 0, 2, 3, 3, 4, 4, 5, 6, 7, 8, 0, 0, 0, 0
  65     };
  66     uint8_t channel_layout = header[2] >> 4;
  67
  68     if (avctx->debug & FF_DEBUG_PICT_INFO)
  69         av_dlog(avctx, "pcm_bluray_parse_header: header = %02x%02x%02x%02x\n",
  70                 header[0], header[1], header[2], header[3]);
  71
  72     /* get the sample depth and derive the sample format from it */
  73     avctx->bits_per_coded_sample = bits_per_samples[header[3] >> 6];
  74     if (!(avctx->bits_per_coded_sample == 16 || avctx->bits_per_coded_sample == 24)) {
  75         av_log(avctx, AV_LOG_ERROR, "unsupported sample depth (%d)\n", avctx->bits_per_coded_sample);
  76         return AVERROR_INVALIDDATA;
  77     }
  78     avctx->sample_fmt = avctx->bits_per_coded_sample == 16 ? AV_SAMPLE_FMT_S16
  79                                                            : AV_SAMPLE_FMT_S32;
  80     if (avctx->sample_fmt == AV_SAMPLE_FMT_S32)
  81         avctx->bits_per_raw_sample = avctx->bits_per_coded_sample;
  82
  83     /* get the sample rate. Not all values are used. */
  84     switch (header[2] & 0x0f) {
  85     case 1:
  86         avctx->sample_rate = 48000;
  87         break;
  88     case 4:
  89         avctx->sample_rate = 96000;
  90         break;
  91     case 5:
  92         avctx->sample_rate = 192000;
  93         break;
  94     default:
  95         avctx->sample_rate = 0;
  96         av_log(avctx, AV_LOG_ERROR, "reserved sample rate (%d)\n",
  97                header[2] & 0x0f);
  98         return AVERROR_INVALIDDATA;
  99     }
 100
 101     /*
 102      * get the channel number (and mapping). Not all values are used.
 103      * It must be noted that the number of channels in the MPEG stream can
 104      * differ from the actual meaningful number, e.g. mono audio still has two
 105      * channels, one being empty.
 106      */
 107     avctx->channel_layout  = channel_layouts[channel_layout];
 108     avctx->channels        =        channels[channel_layout];
 109     if (!avctx->channels) {
 110         av_log(avctx, AV_LOG_ERROR, "reserved channel configuration (%d)\n",
 111                channel_layout);
 112         return AVERROR_INVALIDDATA;
 113     }
 114
 115     avctx->bit_rate = FFALIGN(avctx->channels, 2) * avctx->sample_rate *
 116                       avctx->bits_per_coded_sample;
 117
 118     if (avctx->debug & FF_DEBUG_PICT_INFO)
 119         av_dlog(avctx,
 120                 "pcm_bluray_parse_header: %d channels, %d bits per sample, %d Hz, %d bit/s\n",
 121                 avctx->channels, avctx->bits_per_coded_sample,
 122                 avctx->sample_rate, avctx->bit_rate);
 123     return 0;
 124 }
 125
 126 static int pcm_bluray_decode_frame(AVCodecContext *avctx, void *data,
 127                                    int *got_frame_ptr, AVPacket *avpkt)
 128 {
 129     AVFrame *frame     = data;
 130     const uint8_t *src = avpkt->data;
 131     int buf_size = avpkt->size;
 132     GetByteContext gb;
 133     int num_source_channels, channel, retval;
 134     int sample_size, samples;
 135     int16_t *dst16;
 136     int32_t *dst32;
 137
 138     if (buf_size < 4) {
 139         av_log(avctx, AV_LOG_ERROR, "PCM packet too small\n");
 140         return AVERROR_INVALIDDATA;
 141     }
 142
 143     if ((retval = pcm_bluray_parse_header(avctx, src)))
 144         return retval;
 145     src += 4;
 146     buf_size -= 4;
 147
 148     bytestream2_init(&gb, src, buf_size);
 149
 150     /* There's always an even number of channels in the source */
 151     num_source_channels = FFALIGN(avctx->channels, 2);
 152     sample_size = (num_source_channels *
 153                    (avctx->sample_fmt == AV_SAMPLE_FMT_S16 ? 16 : 24)) >> 3;
 154     samples = buf_size / sample_size;
 155
 156     /* get output buffer */
 157     frame->nb_samples = samples;
 158     if ((retval = ff_get_buffer(avctx, frame, 0)) < 0)
 159         return retval;
 160     dst16 = (int16_t *)frame->data[0];
 161     dst32 = (int32_t *)frame->data[0];
 162
 163     if (samples) {
 164         switch (avctx->channel_layout) {
 165             /* cases with same number of source and coded channels */
 166         case AV_CH_LAYOUT_STEREO:
 167         case AV_CH_LAYOUT_4POINT0:
 168         case AV_CH_LAYOUT_2_2:
 169             samples *= num_source_channels;
 170             if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
 171 #if HAVE_BIGENDIAN
 172                 bytestream2_get_buffer(&gb, dst16, buf_size);
 173 #else
 174                 do {
 175                     *dst16++ = bytestream2_get_be16u(&gb);
 176                 } while (--samples);
 177 #endif
 178             } else {
 179                 do {
 180                     *dst32++ = bytestream2_get_be24u(&gb) << 8;
 181                 } while (--samples);
 182             }
 183             break;
 184         /* cases where number of source channels = coded channels + 1 */
 185         case AV_CH_LAYOUT_MONO:
 186         case AV_CH_LAYOUT_SURROUND:
 187         case AV_CH_LAYOUT_2_1:
 188         case AV_CH_LAYOUT_5POINT0:
 189             if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
 190                 do {
 191 #if HAVE_BIGENDIAN
 192                     bytestream2_get_buffer(&gb, dst16, avctx->channels * 2);
 193                     dst16 += avctx->channels;
 194 #else
 195                     channel = avctx->channels;
 196                     do {
 197                         *dst16++ = bytestream2_get_be16u(&gb);
 198                     } while (--channel);
 199 #endif
 200                     bytestream2_skip(&gb, 2);
 201                 } while (--samples);
 202             } else {
 203                 do {
 204                     channel = avctx->channels;
 205                     do {
 206                         *dst32++ = bytestream2_get_be24u(&gb) << 8;
 207                     } while (--channel);
 208                     bytestream2_skip(&gb, 3);
 209                 } while (--samples);
 210             }
 211             break;
 212             /* remapping: L, R, C, LBack, RBack, LF */
 213         case AV_CH_LAYOUT_5POINT1:
 214             if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
 215                 do {
 216                     dst16[0] = bytestream2_get_be16u(&gb);
 217                     dst16[1] = bytestream2_get_be16u(&gb);
 218                     dst16[2] = bytestream2_get_be16u(&gb);
 219                     dst16[4] = bytestream2_get_be16u(&gb);
 220                     dst16[5] = bytestream2_get_be16u(&gb);
 221                     dst16[3] = bytestream2_get_be16u(&gb);
 222                     dst16 += 6;
 223                 } while (--samples);
 224             } else {
 225                 do {
 226                     dst32[0] = bytestream2_get_be24u(&gb) << 8;
 227                     dst32[1] = bytestream2_get_be24u(&gb) << 8;
 228                     dst32[2] = bytestream2_get_be24u(&gb) << 8;
 229                     dst32[4] = bytestream2_get_be24u(&gb) << 8;
 230                     dst32[5] = bytestream2_get_be24u(&gb) << 8;
 231                     dst32[3] = bytestream2_get_be24u(&gb) << 8;
 232                     dst32 += 6;
 233                 } while (--samples);
 234             }
 235             break;
 236             /* remapping: L, R, C, LSide, LBack, RBack, RSide, <unused> */
 237         case AV_CH_LAYOUT_7POINT0:
 238             if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
 239                 do {
 240                     dst16[0] = bytestream2_get_be16u(&gb);
 241                     dst16[1] = bytestream2_get_be16u(&gb);
 242                     dst16[2] = bytestream2_get_be16u(&gb);
 243                     dst16[5] = bytestream2_get_be16u(&gb);
 244                     dst16[3] = bytestream2_get_be16u(&gb);
 245                     dst16[4] = bytestream2_get_be16u(&gb);
 246                     dst16[6] = bytestream2_get_be16u(&gb);
 247                     dst16 += 7;
 248                     bytestream2_skip(&gb, 2);
 249                 } while (--samples);
 250             } else {
 251                 do {
 252                     dst32[0] = bytestream2_get_be24u(&gb) << 8;
 253                     dst32[1] = bytestream2_get_be24u(&gb) << 8;
 254                     dst32[2] = bytestream2_get_be24u(&gb) << 8;
 255                     dst32[5] = bytestream2_get_be24u(&gb) << 8;
 256                     dst32[3] = bytestream2_get_be24u(&gb) << 8;
 257                     dst32[4] = bytestream2_get_be24u(&gb) << 8;
 258                     dst32[6] = bytestream2_get_be24u(&gb) << 8;
 259                     dst32 += 7;
 260                     bytestream2_skip(&gb, 3);
 261                 } while (--samples);
 262             }
 263             break;
 264             /* remapping: L, R, C, LSide, LBack, RBack, RSide, LF */
 265         case AV_CH_LAYOUT_7POINT1:
 266             if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
 267                 do {
 268                     dst16[0] = bytestream2_get_be16u(&gb);
 269                     dst16[1] = bytestream2_get_be16u(&gb);
 270                     dst16[2] = bytestream2_get_be16u(&gb);
 271                     dst16[6] = bytestream2_get_be16u(&gb);
 272                     dst16[4] = bytestream2_get_be16u(&gb);
 273                     dst16[5] = bytestream2_get_be16u(&gb);
 274                     dst16[7] = bytestream2_get_be16u(&gb);
 275                     dst16[3] = bytestream2_get_be16u(&gb);
 276                     dst16 += 8;
 277                 } while (--samples);
 278             } else {
 279                 do {
 280                     dst32[0] = bytestream2_get_be24u(&gb) << 8;
 281                     dst32[1] = bytestream2_get_be24u(&gb) << 8;
 282                     dst32[2] = bytestream2_get_be24u(&gb) << 8;
 283                     dst32[6] = bytestream2_get_be24u(&gb) << 8;
 284                     dst32[4] = bytestream2_get_be24u(&gb) << 8;
 285                     dst32[5] = bytestream2_get_be24u(&gb) << 8;
 286                     dst32[7] = bytestream2_get_be24u(&gb) << 8;
 287                     dst32[3] = bytestream2_get_be24u(&gb) << 8;
 288                     dst32 += 8;
 289                 } while (--samples);
 290             }
 291             break;
 292         }
 293     }
 294
 295     *got_frame_ptr = 1;
 296
 297     retval = bytestream2_tell(&gb);
 298     if (avctx->debug & FF_DEBUG_BITSTREAM)
 299         av_dlog(avctx, "pcm_bluray_decode_frame: decoded %d -> %d bytes\n",
 300                 retval, buf_size);
 301     return retval + 4;
 302 }
 303
 304 AVCodec ff_pcm_bluray_decoder = {
 305     .name           = "pcm_bluray",
 306     .long_name      = NULL_IF_CONFIG_SMALL("PCM signed 16|20|24-bit big-endian for Blu-ray media"),
 307     .type           = AVMEDIA_TYPE_AUDIO,
 308     .id             = AV_CODEC_ID_PCM_BLURAY,
 309     .decode         = pcm_bluray_decode_frame,
 310     .capabilities   = CODEC_CAP_DR1,
 311     .sample_fmts    = (const enum AVSampleFormat[]){
 312         AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_NONE
 313     },
 314 };