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Port SMPTE S302M audio decoder from FFmbc 0.3.

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This commit is contained in:
Baptiste Coudurier 2011-04-12 15:29:09 -07:00 • committed by Diego Biurrun
parent b44c8ad280
commit 9aa91043f3
7 changed files with 147 additions and 0 deletions
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1
Changelog
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@ -7,6 +7,7 @@ version <next>:
- Lots of deprecated API cruft removed
- fft and imdct optimizations for AVX (Sandy Bridge) processors
- DPX image encoder
- SMPTE 302M AES3 audio decoder
version 0.7_beta1:

1
doc/general.texi
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@ -673,6 +673,7 @@ following image formats are supported:
@item Sierra VMD audio @tab @tab X
@tab Used in Sierra VMD files.
@item Smacker audio @tab @tab X
@item SMPTE 302M AES3 audio @tab @tab X
@item Speex @tab @tab E
@tab supported through external library libspeex
@item True Audio (TTA) @tab @tab X

1
libavcodec/Makefile
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@ -324,6 +324,7 @@ OBJS-$(CONFIG_RV30_DECODER) += rv30.o rv34.o rv30dsp.o \
mpegvideo.o error_resilience.o
OBJS-$(CONFIG_RV40_DECODER) += rv40.o rv34.o rv40dsp.o \
mpegvideo.o error_resilience.o
OBJS-$(CONFIG_S302M_DECODER) += s302m.o
OBJS-$(CONFIG_SGI_DECODER) += sgidec.o
OBJS-$(CONFIG_SGI_ENCODER) += sgienc.o rle.o
OBJS-$(CONFIG_SHORTEN_DECODER) += shorten.o

1
libavcodec/allcodecs.c
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@ -177,6 +177,7 @@ void avcodec_register_all(void)
REGISTER_ENCDEC (RV20, rv20);
REGISTER_DECODER (RV30, rv30);
REGISTER_DECODER (RV40, rv40);
REGISTER_DECODER (S302M, s302m);
REGISTER_ENCDEC (SGI, sgi);
REGISTER_DECODER (SMACKER, smacker);
REGISTER_DECODER (SMC, smc);

1
libavcodec/avcodec.h
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@ -232,6 +232,7 @@ enum CodecID {
CODEC_ID_PCM_F64LE,
CODEC_ID_PCM_BLURAY,
CODEC_ID_PCM_LXF,
CODEC_ID_S302M,
/* various ADPCM codecs */
CODEC_ID_ADPCM_IMA_QT= 0x11000,

141
libavcodec/s302m.c Normal file
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@ -0,0 +1,141 @@
/*
* SMPTE 302M decoder
* Copyright (c) 2008 Laurent Aimar <fenrir@videolan.org>
* Copyright (c) 2009 Baptiste Coudurier <baptiste.coudurier@gmail.com>
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#define AES3_HEADER_LEN 4
static int s302m_parse_frame_header(AVCodecContext *avctx, const uint8_t *buf,
int buf_size)
{
uint32_t h;
int frame_size, channels, id, bits;
if (buf_size <= AES3_HEADER_LEN) {
av_log(avctx, AV_LOG_ERROR, "frame is too short\n");
return AVERROR_INVALIDDATA;
}
/*
* AES3 header :
* size: 16
* number channels 2
* channel_id 8
* bits per samples 2
* alignments 4
*/
h = AV_RB32(buf);
frame_size = (h >> 16) & 0xffff;
channels = ((h >> 14) & 0x0003) * 2 + 2;
id = (h >> 6) & 0x00ff;
bits = ((h >> 4) & 0x0003) * 4 + 16;
if (AES3_HEADER_LEN + frame_size != buf_size || bits > 24) {
av_log(avctx, AV_LOG_ERROR, "frame has invalid header\n");
return AVERROR_INVALIDDATA;
}
/* Set output properties */
avctx->bits_per_coded_sample = bits;
if (bits > 16)
avctx->sample_fmt = SAMPLE_FMT_S32;
else
avctx->sample_fmt = SAMPLE_FMT_S16;
avctx->channels = channels;
avctx->sample_rate = 48000;
avctx->bit_rate = 48000 * avctx->channels * (avctx->bits_per_coded_sample + 4) +
32 * (48000 / (buf_size * 8 /
(avctx->channels *
(avctx->bits_per_coded_sample + 4))));
return frame_size;
}
static int s302m_decode_frame(AVCodecContext *avctx, void *data,
int *data_size, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
int frame_size = s302m_parse_frame_header(avctx, buf, buf_size);
if (frame_size < 0)
return frame_size;
buf_size -= AES3_HEADER_LEN;
buf += AES3_HEADER_LEN;
if (*data_size < 4 * buf_size * 8 / (avctx->bits_per_coded_sample + 4))
return -1;
if (avctx->bits_per_coded_sample == 24) {
uint32_t *o = data;
for (; buf_size > 6; buf_size -= 7) {
*o++ = (av_reverse[buf[2]] << 24) |
(av_reverse[buf[1]] << 16) |
(av_reverse[buf[0]] << 8);
*o++ = (av_reverse[buf[6] & 0xf0] << 28) |
(av_reverse[buf[5]] << 20) |
(av_reverse[buf[4]] << 12) |
(av_reverse[buf[3] & 0x0f] << 8);
buf += 7;
}
*data_size = (uint8_t*) o - (uint8_t*) data;
} else if (avctx->bits_per_coded_sample == 20) {
uint32_t *o = data;
for (; buf_size > 5; buf_size -= 6) {
*o++ = (av_reverse[buf[2] & 0xf0] << 28) |
(av_reverse[buf[1]] << 20) |
(av_reverse[buf[0]] << 12);
*o++ = (av_reverse[buf[5] & 0xf0] << 28) |
(av_reverse[buf[4]] << 20) |
(av_reverse[buf[3]] << 12);
buf += 6;
}
*data_size = (uint8_t*) o - (uint8_t*) data;
} else {
uint16_t *o = data;
for (; buf_size > 4; buf_size -= 5) {
*o++ = (av_reverse[buf[1]] << 8) |
av_reverse[buf[0]];
*o++ = (av_reverse[buf[4] & 0xf0] << 12) |
(av_reverse[buf[3]] << 4) |
av_reverse[buf[2] & 0x0f];
buf += 5;
}
*data_size = (uint8_t*) o - (uint8_t*) data;
}
return buf - avpkt->data;
}
AVCodec ff_s302m_decoder = {
.name = "s302m",
.type = AVMEDIA_TYPE_AUDIO,
.id = CODEC_ID_S302M,
.priv_data_size = 0,
.decode = s302m_decode_frame,
.long_name = NULL_IF_CONFIG_SMALL("SMPTE 302M"),
};

1
libavformat/mpegts.c
View file

@ -524,6 +524,7 @@ static const StreamType MISC_types[] = {
static const StreamType REGD_types[] = {
{ MKTAG('d','r','a','c'), AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
{ MKTAG('A','C','-','3'), AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
{ MKTAG('B','S','S','D'), AVMEDIA_TYPE_AUDIO, CODEC_ID_S302M },
{ 0 },
};