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mirror of https://git.videolan.org/git/ffmpeg.git synced 2024-09-12 18:25:57 +02:00
ffmpeg/libavcodec/s302m.c
Michael Niedermayer 99eb31e263 Merge remote-tracking branch 'qatar/master'
* qatar/master: (25 commits)
  Replace custom DEBUG preprocessor trickery by the standard one.
  vorbis: Remove non-compiling debug statement.
  vorbis: Remove pointless DEBUG #ifdef around debug output macros.
  cook: Remove non-compiling debug output.
  Remove pointless #ifdefs around function declarations in a header.
  Replace #ifdef + av_log() combinations by av_dlog().
  Replace custom debug output functions by av_dlog().
  cook: Remove unused debug functions.
  Remove stray extra arguments from av_dlog() invocations.
  targa: fix big-endian build
  v4l2: remove one forgotten use of AVFormatParameters.pix_fmt.
  vfwcap: add a framerate private option.
  v4l2: add a framerate private option.
  libdc1394: add a framerate private option.
  fbdev: add a framerate private option.
  bktr: add a framerate private option.
  oma: check avio_read() return value
  nutdec: remove unused variable
  Remove unused variables
  swscale: allocate larger buffer to handle altivec overreads.
  ...

Conflicts:
	ffmpeg.c
	libavcodec/dca.c
	libavcodec/dirac.c
	libavcodec/error_resilience.c
	libavcodec/h264.c
	libavcodec/mpeg12.c
	libavcodec/mpeg4videodec.c
	libavcodec/mpegvideo.c
	libavcodec/mpegvideo_enc.c
	libavcodec/pthread.c
	libavcodec/rv10.c
	libavcodec/s302m.c
	libavcodec/shorten.c
	libavcodec/truemotion2.c
	libavcodec/utils.c
	libavdevice/dv1394.c
	libavdevice/fbdev.c
	libavdevice/libdc1394.c
	libavdevice/v4l2.c
	libavformat/4xm.c
	libavformat/apetag.c
	libavformat/asfdec.c
	libavformat/avidec.c
	libavformat/mmf.c
	libavformat/mpeg.c
	libavformat/mpegenc.c
	libavformat/mpegts.c
	libavformat/oggdec.c
	libavformat/oggparseogm.c
	libavformat/rl2.c
	libavformat/rmdec.c
	libavformat/rpl.c
	libavformat/rtpdec_latm.c
	libavformat/sauce.c
	libavformat/sol.c
	libswscale/utils.c
	tests/ref/vsynth1/error
	tests/ref/vsynth2/error

Merged-by: Michael Niedermayer <michaelni@gmx.at>
2011-06-03 05:19:30 +02:00

151 lines
5.0 KiB
C

/*
* 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 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
*/
#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, 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;
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;
switch(channels) {
case 2:
avctx->channel_layout = AV_CH_LAYOUT_STEREO;
break;
case 4:
avctx->channel_layout = AV_CH_LAYOUT_QUAD;
break;
case 8:
avctx->channel_layout = AV_CH_LAYOUT_5POINT1_BACK | AV_CH_LAYOUT_STEREO_DOWNMIX;
}
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"),
};