| 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 | }; |