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/*
* LPCM codecs for PCM formats found in MPEG streams
* Copyright (c) 2009 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
*/
/** |
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* @file |
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* PCM codecs for encodings found in MPEG streams (DVD/Blu-ray)
*/
|
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#include "libavutil/channel_layout.h" |
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#include "avcodec.h"
#include "bytestream.h" |
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#include "internal.h" |
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/*
* 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 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] = { |
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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 |
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};
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) |
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av_dlog(avctx, "pcm_bluray_parse_header: header = %02x%02x%02x%02x\n", |
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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]; |
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if (!(avctx->bits_per_coded_sample == 16 || avctx->bits_per_coded_sample == 24)) { |
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av_log(avctx, AV_LOG_ERROR, "unsupported sample depth (%d)\n", avctx->bits_per_coded_sample); |
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return -1;
} |
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avctx->sample_fmt = avctx->bits_per_coded_sample == 16 ? AV_SAMPLE_FMT_S16 :
AV_SAMPLE_FMT_S32; |
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if (avctx->sample_fmt == AV_SAMPLE_FMT_S32)
avctx->bits_per_raw_sample = avctx->bits_per_coded_sample; |
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|
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/* get the sample rate. Not all values are used. */ |
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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; |
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av_log(avctx, AV_LOG_ERROR, "reserved sample rate (%d)\n", |
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header[2] & 0x0f);
return -1;
}
/* |
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* get the channel number (and mapping). Not all values are used. |
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* 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) { |
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av_log(avctx, AV_LOG_ERROR, "reserved channel configuration (%d)\n", |
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channel_layout);
return -1;
}
|
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avctx->bit_rate = FFALIGN(avctx->channels, 2) * avctx->sample_rate * |
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avctx->bits_per_coded_sample;
if (avctx->debug & FF_DEBUG_PICT_INFO) |
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av_dlog(avctx, |
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"pcm_bluray_parse_header: %d channels, %d bits per sample, %d Hz, %d bit/s\n", |
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avctx->channels, avctx->bits_per_coded_sample,
avctx->sample_rate, avctx->bit_rate);
return 0;
}
|
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typedef struct PCMBRDecode {
AVFrame frame;
} PCMBRDecode;
static av_cold int pcm_bluray_decode_init(AVCodecContext * avctx)
{
PCMBRDecode *s = avctx->priv_data;
avcodec_get_frame_defaults(&s->frame);
avctx->coded_frame = &s->frame;
return 0;
}
static int pcm_bluray_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame_ptr, AVPacket *avpkt) |
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{
const uint8_t *src = avpkt->data;
int buf_size = avpkt->size; |
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PCMBRDecode *s = avctx->priv_data; |
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GetByteContext gb; |
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int num_source_channels, channel, retval; |
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int sample_size, samples;
int16_t *dst16;
int32_t *dst32; |
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if (buf_size < 4) {
av_log(avctx, AV_LOG_ERROR, "PCM packet too small\n");
return -1;
}
if (pcm_bluray_parse_header(avctx, src))
return -1;
src += 4;
buf_size -= 4;
|
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bytestream2_init(&gb, src, buf_size);
|
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/* There's always an even number of channels in the source */
num_source_channels = FFALIGN(avctx->channels, 2); |
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sample_size = (num_source_channels * (avctx->sample_fmt == AV_SAMPLE_FMT_S16 ? 16 : 24)) >> 3; |
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samples = buf_size / sample_size;
|
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/* get output buffer */
s->frame.nb_samples = samples; |
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if ((retval = ff_get_buffer(avctx, &s->frame)) < 0) { |
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return retval; |
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} |
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dst16 = (int16_t *)s->frame.data[0];
dst32 = (int32_t *)s->frame.data[0]; |
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if (samples) {
switch (avctx->channel_layout) {
/* cases with same number of source and coded channels */ |
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case AV_CH_LAYOUT_STEREO:
case AV_CH_LAYOUT_4POINT0:
case AV_CH_LAYOUT_2_2: |
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samples *= num_source_channels; |
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if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) { |
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#if HAVE_BIGENDIAN |
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bytestream2_get_buffer(&gb, dst16, buf_size); |
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#else
do { |
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*dst16++ = bytestream2_get_be16u(&gb); |
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} while (--samples);
#endif
} else {
do { |
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*dst32++ = bytestream2_get_be24u(&gb) << 8; |
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} while (--samples);
}
break;
/* cases where number of source channels = coded channels + 1 */ |
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case AV_CH_LAYOUT_MONO:
case AV_CH_LAYOUT_SURROUND:
case AV_CH_LAYOUT_2_1:
case AV_CH_LAYOUT_5POINT0: |
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if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) { |
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do {
#if HAVE_BIGENDIAN |
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bytestream2_get_buffer(&gb, dst16, avctx->channels * 2); |
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dst16 += avctx->channels;
#else
channel = avctx->channels;
do { |
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*dst16++ = bytestream2_get_be16u(&gb); |
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} while (--channel);
#endif |
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bytestream2_skip(&gb, 2); |
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} while (--samples);
} else {
do {
channel = avctx->channels;
do { |
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*dst32++ = bytestream2_get_be24u(&gb) << 8; |
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} while (--channel); |
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bytestream2_skip(&gb, 3); |
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} while (--samples);
}
break;
/* remapping: L, R, C, LBack, RBack, LF */ |
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case AV_CH_LAYOUT_5POINT1: |
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if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) { |
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do { |
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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); |
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dst16 += 6;
} while (--samples);
} else {
do { |
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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; |
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dst32 += 6;
} while (--samples);
}
break;
/* remapping: L, R, C, LSide, LBack, RBack, RSide, <unused> */ |
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case AV_CH_LAYOUT_7POINT0: |
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if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) { |
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do { |
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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); |
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dst16 += 7; |
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bytestream2_skip(&gb, 2); |
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} while (--samples);
} else {
do { |
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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; |
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dst32 += 7; |
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bytestream2_skip(&gb, 3); |
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} while (--samples);
}
break;
/* remapping: L, R, C, LSide, LBack, RBack, RSide, LF */ |
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case AV_CH_LAYOUT_7POINT1: |
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if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) { |
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do { |
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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); |
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dst16 += 8;
} while (--samples);
} else {
do { |
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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; |
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dst32 += 8;
} while (--samples);
}
break;
}
}
|
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*got_frame_ptr = 1;
*(AVFrame *)data = s->frame;
|
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retval = bytestream2_tell(&gb); |
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if (avctx->debug & FF_DEBUG_BITSTREAM) |
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av_dlog(avctx, "pcm_bluray_decode_frame: decoded %d -> %d bytes\n", |
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retval, buf_size); |
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return retval + 4; |
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}
|
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AVCodec ff_pcm_bluray_decoder = { |
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.name = "pcm_bluray",
.type = AVMEDIA_TYPE_AUDIO, |
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.id = AV_CODEC_ID_PCM_BLURAY, |
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.priv_data_size = sizeof(PCMBRDecode),
.init = pcm_bluray_decode_init, |
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.decode = pcm_bluray_decode_frame, |
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.capabilities = CODEC_CAP_DR1, |
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.sample_fmts = (const enum AVSampleFormat[]){
AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_NONE
},
.long_name = NULL_IF_CONFIG_SMALL("PCM signed 16|20|24-bit big-endian for Blu-ray media"), |
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}; |