0,0 → 1,314 |
/* |
* 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 "internal.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 uint32_t channel_layouts[16] = { |
0, AV_CH_LAYOUT_MONO, 0, AV_CH_LAYOUT_STEREO, AV_CH_LAYOUT_SURROUND, |
AV_CH_LAYOUT_2_1, AV_CH_LAYOUT_4POINT0, AV_CH_LAYOUT_2_2, |
AV_CH_LAYOUT_5POINT0, AV_CH_LAYOUT_5POINT1, AV_CH_LAYOUT_7POINT0, |
AV_CH_LAYOUT_7POINT1, 0, 0, 0, 0 |
}; |
static const uint8_t channels[16] = { |
0, 1, 0, 2, 3, 3, 4, 4, 5, 6, 7, 8, 0, 0, 0, 0 |
}; |
uint8_t channel_layout = header[2] >> 4; |
|
if (avctx->debug & FF_DEBUG_PICT_INFO) |
av_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. |
*/ |
avctx->channel_layout = channel_layouts[channel_layout]; |
avctx->channels = channels[channel_layout]; |
if (!avctx->channels) { |
av_log(avctx, AV_LOG_ERROR, "reserved channel configuration (%d)\n", |
channel_layout); |
return AVERROR_INVALIDDATA; |
} |
|
avctx->bit_rate = FFALIGN(avctx->channels, 2) * avctx->sample_rate * |
avctx->bits_per_coded_sample; |
|
if (avctx->debug & FF_DEBUG_PICT_INFO) |
av_dlog(avctx, |
"pcm_bluray_parse_header: %d channels, %d bits per sample, %d Hz, %d bit/s\n", |
avctx->channels, avctx->bits_per_coded_sample, |
avctx->sample_rate, avctx->bit_rate); |
return 0; |
} |
|
static int pcm_bluray_decode_frame(AVCodecContext *avctx, void *data, |
int *got_frame_ptr, AVPacket *avpkt) |
{ |
AVFrame *frame = data; |
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->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->channel_layout) { |
/* 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, 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, dst16, avctx->channels * 2); |
dst16 += avctx->channels; |
#else |
channel = avctx->channels; |
do { |
*dst16++ = bytestream2_get_be16u(&gb); |
} while (--channel); |
#endif |
bytestream2_skip(&gb, 2); |
} while (--samples); |
} else { |
do { |
channel = avctx->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) |
av_dlog(avctx, "pcm_bluray_decode_frame: decoded %d -> %d bytes\n", |
retval, buf_size); |
return retval + 4; |
} |
|
AVCodec ff_pcm_bluray_decoder = { |
.name = "pcm_bluray", |
.long_name = NULL_IF_CONFIG_SMALL("PCM signed 16|20|24-bit big-endian for Blu-ray media"), |
.type = AVMEDIA_TYPE_AUDIO, |
.id = AV_CODEC_ID_PCM_BLURAY, |
.decode = pcm_bluray_decode_frame, |
.capabilities = CODEC_CAP_DR1, |
.sample_fmts = (const enum AVSampleFormat[]){ |
AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_NONE |
}, |
}; |