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FFmpeg/libavcodec/pcm-mpeg.c
Reinhard Tartler 737eb5976f Merge libavcore into libavutil 
It is pretty hopeless that other considerable projects will adopt
libavutil alone in other projects. Projects that need small footprint
are better off with more specialized libraries such as gnulib or rather
just copy the necessary parts that they need. With this in mind, nobody
is helped by having libavutil and libavcore split. In order to ease
maintenance inside and around FFmpeg and to reduce confusion where to
put common code, avcore's functionality is merged (back) to avutil.

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
2011-02-15 16:18:21 +01:00

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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
*/
/**
* @file
* PCM codecs for encodings found in MPEG streams (DVD/Blu-ray)
*/
#include "libavutil/audioconvert.h"
#include "avcodec.h"
#include "bytestream.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 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) {
av_log(avctx, AV_LOG_ERROR, "unsupported sample depth (0)\n");
return -1;
}
avctx->sample_fmt = avctx->bits_per_coded_sample == 16 ? AV_SAMPLE_FMT_S16 :
AV_SAMPLE_FMT_S32;
/* get the sample rate. Not all values are known or exist. */
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, "unsupported sample rate (%d)\n",
header[2] & 0x0f);
return -1;
}
/*
* get the channel number (and mapping). Not all values are known or exist.
* 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, "unsupported channel configuration (%d)\n",
channel_layout);
return -1;
}
avctx->bit_rate = avctx->channels * 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 kHz, %d kbit\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 *data_size,
AVPacket *avpkt)
{
const uint8_t *src = avpkt->data;
int buf_size = avpkt->size;
int num_source_channels, channel, retval;
int sample_size, samples, output_size;
int16_t *dst16 = data;
int32_t *dst32 = data;
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;
/* There's always an even number of channels in the source */
num_source_channels = FFALIGN(avctx->channels, 2);
sample_size = (num_source_channels * avctx->bits_per_coded_sample) >> 3;
samples = buf_size / sample_size;
output_size = samples * avctx->channels *
(avctx->sample_fmt == AV_SAMPLE_FMT_S32 ? 4 : 2);
if (output_size > *data_size) {
av_log(avctx, AV_LOG_ERROR,
"Insufficient output buffer space (%d bytes, needed %d bytes)\n",
*data_size, output_size);
return -1;
}
*data_size = output_size;
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
memcpy(dst16, src, output_size);
#else
do {
*dst16++ = bytestream_get_be16(&src);
} while (--samples);
#endif
} else {
do {
*dst32++ = bytestream_get_be24(&src) << 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
memcpy(dst16, src, avctx->channels * 2);
dst16 += avctx->channels;
src += sample_size;
#else
channel = avctx->channels;
do {
*dst16++ = bytestream_get_be16(&src);
} while (--channel);
src += 2;
#endif
} while (--samples);
} else {
do {
channel = avctx->channels;
do {
*dst32++ = bytestream_get_be24(&src) << 8;
} while (--channel);
src += 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] = bytestream_get_be16(&src);
dst16[1] = bytestream_get_be16(&src);
dst16[2] = bytestream_get_be16(&src);
dst16[4] = bytestream_get_be16(&src);
dst16[5] = bytestream_get_be16(&src);
dst16[3] = bytestream_get_be16(&src);
dst16 += 6;
} while (--samples);
} else {
do {
dst32[0] = bytestream_get_be24(&src) << 8;
dst32[1] = bytestream_get_be24(&src) << 8;
dst32[2] = bytestream_get_be24(&src) << 8;
dst32[4] = bytestream_get_be24(&src) << 8;
dst32[5] = bytestream_get_be24(&src) << 8;
dst32[3] = bytestream_get_be24(&src) << 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] = bytestream_get_be16(&src);
dst16[1] = bytestream_get_be16(&src);
dst16[2] = bytestream_get_be16(&src);
dst16[5] = bytestream_get_be16(&src);
dst16[3] = bytestream_get_be16(&src);
dst16[4] = bytestream_get_be16(&src);
dst16[6] = bytestream_get_be16(&src);
dst16 += 7;
src += 2;
} while (--samples);
} else {
do {
dst32[0] = bytestream_get_be24(&src) << 8;
dst32[1] = bytestream_get_be24(&src) << 8;
dst32[2] = bytestream_get_be24(&src) << 8;
dst32[5] = bytestream_get_be24(&src) << 8;
dst32[3] = bytestream_get_be24(&src) << 8;
dst32[4] = bytestream_get_be24(&src) << 8;
dst32[6] = bytestream_get_be24(&src) << 8;
dst32 += 7;
src += 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] = bytestream_get_be16(&src);
dst16[1] = bytestream_get_be16(&src);
dst16[2] = bytestream_get_be16(&src);
dst16[6] = bytestream_get_be16(&src);
dst16[4] = bytestream_get_be16(&src);
dst16[5] = bytestream_get_be16(&src);
dst16[7] = bytestream_get_be16(&src);
dst16[3] = bytestream_get_be16(&src);
dst16 += 8;
} while (--samples);
} else {
do {
dst32[0] = bytestream_get_be24(&src) << 8;
dst32[1] = bytestream_get_be24(&src) << 8;
dst32[2] = bytestream_get_be24(&src) << 8;
dst32[6] = bytestream_get_be24(&src) << 8;
dst32[4] = bytestream_get_be24(&src) << 8;
dst32[5] = bytestream_get_be24(&src) << 8;
dst32[7] = bytestream_get_be24(&src) << 8;
dst32[3] = bytestream_get_be24(&src) << 8;
dst32 += 8;
} while (--samples);
}
break;
}
}
retval = src - avpkt->data;
if (avctx->debug & FF_DEBUG_BITSTREAM)
av_dlog(avctx, "pcm_bluray_decode_frame: decoded %d -> %d bytes\n",
retval, *data_size);
return retval;
}
AVCodec ff_pcm_bluray_decoder = {
"pcm_bluray",
AVMEDIA_TYPE_AUDIO,
CODEC_ID_PCM_BLURAY,
0,
NULL,
NULL,
NULL,
pcm_bluray_decode_frame,
.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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