forked from KolibriOS/kolibrios
74 lines
2.4 KiB
C
74 lines
2.4 KiB
C
/*
|
|
* Common code for the RTP depacketization of MPEG-1/2 formats.
|
|
* Copyright (c) 2002 Fabrice Bellard
|
|
*
|
|
* 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/attributes.h"
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "rtpdec_formats.h"
|
|
|
|
static av_cold int mpeg_init(AVFormatContext *ctx, int st_index, PayloadContext *data)
|
|
{
|
|
if (st_index < 0)
|
|
return 0;
|
|
ctx->streams[st_index]->need_parsing = AVSTREAM_PARSE_FULL;
|
|
return 0;
|
|
}
|
|
|
|
static int mpeg_parse_packet(AVFormatContext *ctx, PayloadContext *data,
|
|
AVStream *st, AVPacket *pkt, uint32_t *timestamp,
|
|
const uint8_t *buf, int len, uint16_t seq,
|
|
int flags)
|
|
{
|
|
unsigned int h;
|
|
if (len <= 4)
|
|
return AVERROR_INVALIDDATA;
|
|
h = AV_RB32(buf);
|
|
buf += 4;
|
|
len -= 4;
|
|
if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && h & (1 << 26)) {
|
|
/* MPEG-2 */
|
|
if (len <= 4)
|
|
return AVERROR_INVALIDDATA;
|
|
buf += 4;
|
|
len -= 4;
|
|
}
|
|
if (av_new_packet(pkt, len) < 0)
|
|
return AVERROR(ENOMEM);
|
|
memcpy(pkt->data, buf, len);
|
|
pkt->stream_index = st->index;
|
|
return 0;
|
|
}
|
|
|
|
RTPDynamicProtocolHandler ff_mpeg_audio_dynamic_handler = {
|
|
.codec_type = AVMEDIA_TYPE_AUDIO,
|
|
.codec_id = AV_CODEC_ID_MP3,
|
|
.init = mpeg_init,
|
|
.parse_packet = mpeg_parse_packet,
|
|
.static_payload_id = 14,
|
|
};
|
|
|
|
RTPDynamicProtocolHandler ff_mpeg_video_dynamic_handler = {
|
|
.codec_type = AVMEDIA_TYPE_VIDEO,
|
|
.codec_id = AV_CODEC_ID_MPEG2VIDEO,
|
|
.init = mpeg_init,
|
|
.parse_packet = mpeg_parse_packet,
|
|
.static_payload_id = 32,
|
|
};
|