mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-07 11:13:41 +02:00
874c5b02c4
* commit '594d4d5df3c70404168701dd5c90b7e6e5587793': lavc: add a wrapper for AVCodecContext.get_buffer(). Conflicts: libavcodec/4xm.c libavcodec/8svx.c libavcodec/bmv.c libavcodec/cljr.c libavcodec/cscd.c libavcodec/dnxhddec.c libavcodec/dpcm.c libavcodec/dpx.c libavcodec/eacmv.c libavcodec/eamad.c libavcodec/frwu.c libavcodec/g723_1.c libavcodec/gifdec.c libavcodec/idcinvideo.c libavcodec/iff.c libavcodec/indeo3.c libavcodec/internal.h libavcodec/interplayvideo.c libavcodec/kmvc.c libavcodec/mpc7.c libavcodec/mpegaudiodec.c libavcodec/pcx.c libavcodec/pngdec.c libavcodec/pnmdec.c libavcodec/rl2.c libavcodec/snow.c libavcodec/targa.c libavcodec/tscc.c libavcodec/txd.c libavcodec/utils.c libavcodec/v210dec.c libavcodec/vb.c libavcodec/vmdav.c libavcodec/vp56.c libavcodec/vqavideo.c libavcodec/wavpack.c libavcodec/wnv1.c libavcodec/xl.c libavcodec/yop.c Merged-by: Michael Niedermayer <michaelni@gmx.at>
182 lines
5.8 KiB
C
182 lines
5.8 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 "libavutil/log.h"
|
|
#include "avcodec.h"
|
|
#include "internal.h"
|
|
#include "mathops.h"
|
|
|
|
#define AES3_HEADER_LEN 4
|
|
|
|
typedef struct S302MDecodeContext {
|
|
AVFrame frame;
|
|
} S302MDecodeContext;
|
|
|
|
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 = AV_SAMPLE_FMT_S32;
|
|
else
|
|
avctx->sample_fmt = AV_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 6:
|
|
avctx->channel_layout = AV_CH_LAYOUT_5POINT1_BACK;
|
|
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 *got_frame_ptr, AVPacket *avpkt)
|
|
{
|
|
S302MDecodeContext *s = avctx->priv_data;
|
|
const uint8_t *buf = avpkt->data;
|
|
int buf_size = avpkt->size;
|
|
int block_size, ret;
|
|
|
|
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;
|
|
|
|
/* get output buffer */
|
|
block_size = (avctx->bits_per_coded_sample + 4) / 4;
|
|
s->frame.nb_samples = 2 * (buf_size / block_size) / avctx->channels;
|
|
if ((ret = ff_get_buffer(avctx, &s->frame)) < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
|
|
return ret;
|
|
}
|
|
|
|
buf_size = (s->frame.nb_samples * avctx->channels / 2) * block_size;
|
|
|
|
if (avctx->bits_per_coded_sample == 24) {
|
|
uint32_t *o = (uint32_t *)s->frame.data[0];
|
|
for (; buf_size > 6; buf_size -= 7) {
|
|
*o++ = (ff_reverse[buf[2]] << 24) |
|
|
(ff_reverse[buf[1]] << 16) |
|
|
(ff_reverse[buf[0]] << 8);
|
|
*o++ = (ff_reverse[buf[6] & 0xf0] << 28) |
|
|
(ff_reverse[buf[5]] << 20) |
|
|
(ff_reverse[buf[4]] << 12) |
|
|
(ff_reverse[buf[3] & 0x0f] << 4);
|
|
buf += 7;
|
|
}
|
|
} else if (avctx->bits_per_coded_sample == 20) {
|
|
uint32_t *o = (uint32_t *)s->frame.data[0];
|
|
for (; buf_size > 5; buf_size -= 6) {
|
|
*o++ = (ff_reverse[buf[2] & 0xf0] << 28) |
|
|
(ff_reverse[buf[1]] << 20) |
|
|
(ff_reverse[buf[0]] << 12);
|
|
*o++ = (ff_reverse[buf[5] & 0xf0] << 28) |
|
|
(ff_reverse[buf[4]] << 20) |
|
|
(ff_reverse[buf[3]] << 12);
|
|
buf += 6;
|
|
}
|
|
} else {
|
|
uint16_t *o = (uint16_t *)s->frame.data[0];
|
|
for (; buf_size > 4; buf_size -= 5) {
|
|
*o++ = (ff_reverse[buf[1]] << 8) |
|
|
ff_reverse[buf[0]];
|
|
*o++ = (ff_reverse[buf[4] & 0xf0] << 12) |
|
|
(ff_reverse[buf[3]] << 4) |
|
|
(ff_reverse[buf[2]] >> 4);
|
|
buf += 5;
|
|
}
|
|
}
|
|
|
|
*got_frame_ptr = 1;
|
|
*(AVFrame *)data = s->frame;
|
|
|
|
return avpkt->size;
|
|
}
|
|
|
|
static int s302m_decode_init(AVCodecContext *avctx)
|
|
{
|
|
S302MDecodeContext *s = avctx->priv_data;
|
|
|
|
avcodec_get_frame_defaults(&s->frame);
|
|
avctx->coded_frame = &s->frame;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
AVCodec ff_s302m_decoder = {
|
|
.name = "s302m",
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.id = AV_CODEC_ID_S302M,
|
|
.priv_data_size = sizeof(S302MDecodeContext),
|
|
.init = s302m_decode_init,
|
|
.decode = s302m_decode_frame,
|
|
.capabilities = CODEC_CAP_DR1,
|
|
.long_name = NULL_IF_CONFIG_SMALL("SMPTE 302M"),
|
|
};
|