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/*
* Common code for the RTP depacketization of MPEG-1/2 formats.
* Copyright (c) 2002 Fabrice Bellard
*
* 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/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,
};
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