| /* | |
| * LPCM codecs for PCM format found in Blu-ray PCM streams | |
| * Copyright (c) 2009, 2013 Christian Schmidt | |
| * | |
| * This file is part of FFmpeg. | |
| * | |
| * FFmpeg is free software; you can redistribute it and/or | |
| * modify it under the terms of the GNU Lesser General Public | |
| * License as published by the Free Software Foundation; either | |
| * version 2.1 of the License, or (at your option) any later version. | |
| * | |
| * FFmpeg is distributed in the hope that it will be useful, | |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| * Lesser General Public License for more details. | |
| * | |
| * You should have received a copy of the GNU Lesser General Public | |
| * License along with FFmpeg; if not, write to the Free Software | |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| */ | |
| /** | |
| * @file | |
| * PCM codec for Blu-ray PCM audio tracks | |
| */ | |
| #include "libavutil/channel_layout.h" | |
| #include "avcodec.h" | |
| #include "bytestream.h" | |
| #include "codec_internal.h" | |
| #include "decode.h" | |
| /* | |
| * Channel Mapping according to | |
| * Blu-ray Disc Read-Only Format Version 1 | |
| * Part 3: Audio Visual Basic Specifications | |
| * mono M1 X | |
| * stereo L R | |
| * 3/0 L R C X | |
| * 2/1 L R S X | |
| * 3/1 L R C S | |
| * 2/2 L R LS RS | |
| * 3/2 L R C LS RS X | |
| * 3/2+lfe L R C LS RS lfe | |
| * 3/4 L R C LS Rls Rrs RS X | |
| * 3/4+lfe L R C LS Rls Rrs RS lfe | |
| */ | |
| /** | |
| * Parse the header of a LPCM frame read from a Blu-ray MPEG-TS stream | |
| * @param avctx the codec context | |
| * @param header pointer to the first four bytes of the data packet | |
| */ | |
| static int pcm_bluray_parse_header(AVCodecContext *avctx, | |
| const uint8_t *header) | |
| { | |
| static const uint8_t bits_per_samples[4] = { 0, 16, 20, 24 }; | |
| static const AVChannelLayout channel_layouts[16] = { | |
| { 0 }, AV_CHANNEL_LAYOUT_MONO, { 0 }, | |
| AV_CHANNEL_LAYOUT_STEREO, AV_CHANNEL_LAYOUT_SURROUND, AV_CHANNEL_LAYOUT_2_1, | |
| AV_CHANNEL_LAYOUT_4POINT0, AV_CHANNEL_LAYOUT_2_2, AV_CHANNEL_LAYOUT_5POINT0, | |
| AV_CHANNEL_LAYOUT_5POINT1, AV_CHANNEL_LAYOUT_7POINT0, AV_CHANNEL_LAYOUT_7POINT1, | |
| { 0 }, { 0 }, { 0 }, { 0 }, | |
| }; | |
| uint8_t channel_layout = header[2] >> 4; | |
| if (avctx->debug & FF_DEBUG_PICT_INFO) | |
| ff_dlog(avctx, "pcm_bluray_parse_header: header = %02x%02x%02x%02x\n", | |
| header[0], header[1], header[2], header[3]); | |
| /* get the sample depth and derive the sample format from it */ | |
| avctx->bits_per_coded_sample = bits_per_samples[header[3] >> 6]; | |
| if (!(avctx->bits_per_coded_sample == 16 || avctx->bits_per_coded_sample == 24)) { | |
| av_log(avctx, AV_LOG_ERROR, "unsupported sample depth (%d)\n", avctx->bits_per_coded_sample); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| avctx->sample_fmt = avctx->bits_per_coded_sample == 16 ? AV_SAMPLE_FMT_S16 | |
| : AV_SAMPLE_FMT_S32; | |
| if (avctx->sample_fmt == AV_SAMPLE_FMT_S32) | |
| avctx->bits_per_raw_sample = avctx->bits_per_coded_sample; | |
| /* get the sample rate. Not all values are used. */ | |
| switch (header[2] & 0x0f) { | |
| case 1: | |
| avctx->sample_rate = 48000; | |
| break; | |
| case 4: | |
| avctx->sample_rate = 96000; | |
| break; | |
| case 5: | |
| avctx->sample_rate = 192000; | |
| break; | |
| default: | |
| avctx->sample_rate = 0; | |
| av_log(avctx, AV_LOG_ERROR, "reserved sample rate (%d)\n", | |
| header[2] & 0x0f); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| /* | |
| * get the channel number (and mapping). Not all values are used. | |
| * It must be noted that the number of channels in the MPEG stream can | |
| * differ from the actual meaningful number, e.g. mono audio still has two | |
| * channels, one being empty. | |
| */ | |
| av_channel_layout_uninit(&avctx->ch_layout); | |
| avctx->ch_layout = channel_layouts[channel_layout]; | |
| if (!avctx->ch_layout.nb_channels) { | |
| av_log(avctx, AV_LOG_ERROR, "reserved channel configuration (%d)\n", | |
| channel_layout); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| avctx->bit_rate = FFALIGN(avctx->ch_layout.nb_channels, 2) * avctx->sample_rate * | |
| avctx->bits_per_coded_sample; | |
| if (avctx->debug & FF_DEBUG_PICT_INFO) | |
| ff_dlog(avctx, | |
| "pcm_bluray_parse_header: %d channels, %d bits per sample, %d Hz, %"PRId64" bit/s\n", | |
| avctx->ch_layout.nb_channels, avctx->bits_per_coded_sample, | |
| avctx->sample_rate, avctx->bit_rate); | |
| return 0; | |
| } | |
| static int pcm_bluray_decode_frame(AVCodecContext *avctx, AVFrame *frame, | |
| int *got_frame_ptr, AVPacket *avpkt) | |
| { | |
| const uint8_t *src = avpkt->data; | |
| int buf_size = avpkt->size; | |
| GetByteContext gb; | |
| int num_source_channels, channel, retval; | |
| int sample_size, samples; | |
| int16_t *dst16; | |
| int32_t *dst32; | |
| if (buf_size < 4) { | |
| av_log(avctx, AV_LOG_ERROR, "PCM packet too small\n"); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| if ((retval = pcm_bluray_parse_header(avctx, src))) | |
| return retval; | |
| src += 4; | |
| buf_size -= 4; | |
| bytestream2_init(&gb, src, buf_size); | |
| /* There's always an even number of channels in the source */ | |
| num_source_channels = FFALIGN(avctx->ch_layout.nb_channels, 2); | |
| sample_size = (num_source_channels * | |
| (avctx->sample_fmt == AV_SAMPLE_FMT_S16 ? 16 : 24)) >> 3; | |
| samples = buf_size / sample_size; | |
| /* get output buffer */ | |
| frame->nb_samples = samples; | |
| if ((retval = ff_get_buffer(avctx, frame, 0)) < 0) | |
| return retval; | |
| dst16 = (int16_t *)frame->data[0]; | |
| dst32 = (int32_t *)frame->data[0]; | |
| if (samples) { | |
| switch (avctx->ch_layout.u.mask) { | |
| /* cases with same number of source and coded channels */ | |
| case AV_CH_LAYOUT_STEREO: | |
| case AV_CH_LAYOUT_4POINT0: | |
| case AV_CH_LAYOUT_2_2: | |
| samples *= num_source_channels; | |
| if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) { | |
| #if HAVE_BIGENDIAN | |
| bytestream2_get_buffer(&gb, (uint8_t*)dst16, buf_size); | |
| #else | |
| do { | |
| *dst16++ = bytestream2_get_be16u(&gb); | |
| } while (--samples); | |
| #endif | |
| } else { | |
| do { | |
| *dst32++ = bytestream2_get_be24u(&gb) << 8; | |
| } while (--samples); | |
| } | |
| break; | |
| /* cases where number of source channels = coded channels + 1 */ | |
| case AV_CH_LAYOUT_MONO: | |
| case AV_CH_LAYOUT_SURROUND: | |
| case AV_CH_LAYOUT_2_1: | |
| case AV_CH_LAYOUT_5POINT0: | |
| if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) { | |
| do { | |
| #if HAVE_BIGENDIAN | |
| bytestream2_get_buffer(&gb, (uint8_t*)dst16, | |
| avctx->ch_layout.nb_channels * 2); | |
| dst16 += avctx->ch_layout.nb_channels; | |
| #else | |
| channel = avctx->ch_layout.nb_channels; | |
| do { | |
| *dst16++ = bytestream2_get_be16u(&gb); | |
| } while (--channel); | |
| #endif | |
| bytestream2_skip(&gb, 2); | |
| } while (--samples); | |
| } else { | |
| do { | |
| channel = avctx->ch_layout.nb_channels; | |
| do { | |
| *dst32++ = bytestream2_get_be24u(&gb) << 8; | |
| } while (--channel); | |
| bytestream2_skip(&gb, 3); | |
| } while (--samples); | |
| } | |
| break; | |
| /* remapping: L, R, C, LBack, RBack, LF */ | |
| case AV_CH_LAYOUT_5POINT1: | |
| if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) { | |
| do { | |
| dst16[0] = bytestream2_get_be16u(&gb); | |
| dst16[1] = bytestream2_get_be16u(&gb); | |
| dst16[2] = bytestream2_get_be16u(&gb); | |
| dst16[4] = bytestream2_get_be16u(&gb); | |
| dst16[5] = bytestream2_get_be16u(&gb); | |
| dst16[3] = bytestream2_get_be16u(&gb); | |
| dst16 += 6; | |
| } while (--samples); | |
| } else { | |
| do { | |
| dst32[0] = bytestream2_get_be24u(&gb) << 8; | |
| dst32[1] = bytestream2_get_be24u(&gb) << 8; | |
| dst32[2] = bytestream2_get_be24u(&gb) << 8; | |
| dst32[4] = bytestream2_get_be24u(&gb) << 8; | |
| dst32[5] = bytestream2_get_be24u(&gb) << 8; | |
| dst32[3] = bytestream2_get_be24u(&gb) << 8; | |
| dst32 += 6; | |
| } while (--samples); | |
| } | |
| break; | |
| /* remapping: L, R, C, LSide, LBack, RBack, RSide, <unused> */ | |
| case AV_CH_LAYOUT_7POINT0: | |
| if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) { | |
| do { | |
| dst16[0] = bytestream2_get_be16u(&gb); | |
| dst16[1] = bytestream2_get_be16u(&gb); | |
| dst16[2] = bytestream2_get_be16u(&gb); | |
| dst16[5] = bytestream2_get_be16u(&gb); | |
| dst16[3] = bytestream2_get_be16u(&gb); | |
| dst16[4] = bytestream2_get_be16u(&gb); | |
| dst16[6] = bytestream2_get_be16u(&gb); | |
| dst16 += 7; | |
| bytestream2_skip(&gb, 2); | |
| } while (--samples); | |
| } else { | |
| do { | |
| dst32[0] = bytestream2_get_be24u(&gb) << 8; | |
| dst32[1] = bytestream2_get_be24u(&gb) << 8; | |
| dst32[2] = bytestream2_get_be24u(&gb) << 8; | |
| dst32[5] = bytestream2_get_be24u(&gb) << 8; | |
| dst32[3] = bytestream2_get_be24u(&gb) << 8; | |
| dst32[4] = bytestream2_get_be24u(&gb) << 8; | |
| dst32[6] = bytestream2_get_be24u(&gb) << 8; | |
| dst32 += 7; | |
| bytestream2_skip(&gb, 3); | |
| } while (--samples); | |
| } | |
| break; | |
| /* remapping: L, R, C, LSide, LBack, RBack, RSide, LF */ | |
| case AV_CH_LAYOUT_7POINT1: | |
| if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) { | |
| do { | |
| dst16[0] = bytestream2_get_be16u(&gb); | |
| dst16[1] = bytestream2_get_be16u(&gb); | |
| dst16[2] = bytestream2_get_be16u(&gb); | |
| dst16[6] = bytestream2_get_be16u(&gb); | |
| dst16[4] = bytestream2_get_be16u(&gb); | |
| dst16[5] = bytestream2_get_be16u(&gb); | |
| dst16[7] = bytestream2_get_be16u(&gb); | |
| dst16[3] = bytestream2_get_be16u(&gb); | |
| dst16 += 8; | |
| } while (--samples); | |
| } else { | |
| do { | |
| dst32[0] = bytestream2_get_be24u(&gb) << 8; | |
| dst32[1] = bytestream2_get_be24u(&gb) << 8; | |
| dst32[2] = bytestream2_get_be24u(&gb) << 8; | |
| dst32[6] = bytestream2_get_be24u(&gb) << 8; | |
| dst32[4] = bytestream2_get_be24u(&gb) << 8; | |
| dst32[5] = bytestream2_get_be24u(&gb) << 8; | |
| dst32[7] = bytestream2_get_be24u(&gb) << 8; | |
| dst32[3] = bytestream2_get_be24u(&gb) << 8; | |
| dst32 += 8; | |
| } while (--samples); | |
| } | |
| break; | |
| } | |
| } | |
| *got_frame_ptr = 1; | |
| retval = bytestream2_tell(&gb); | |
| if (avctx->debug & FF_DEBUG_BITSTREAM) | |
| ff_dlog(avctx, "pcm_bluray_decode_frame: decoded %d -> %d bytes\n", | |
| retval, buf_size); | |
| return retval + 4; | |
| } | |
| const FFCodec ff_pcm_bluray_decoder = { | |
| .p.name = "pcm_bluray", | |
| CODEC_LONG_NAME("PCM signed 16|20|24-bit big-endian for Blu-ray media"), | |
| .p.type = AVMEDIA_TYPE_AUDIO, | |
| .p.id = AV_CODEC_ID_PCM_BLURAY, | |
| FF_CODEC_DECODE_CB(pcm_bluray_decode_frame), | |
| .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF, | |
| .p.sample_fmts = (const enum AVSampleFormat[]){ | |
| AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_NONE | |
| }, | |
| }; |