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rtpdec: Split handling of mpeg12 audio/video to a separate depacketizer

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This also adds checking of mallocs.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2013-01-17 15:08:03 +02:00
parent 2326558d52
commit a9c847c1ba
4 changed files with 70 additions and 37 deletions
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1
libavformat/Makefile
View File

@ -34,6 +34,7 @@ OBJS-$(CONFIG_RTPDEC) += rdt.o \
rtpdec_ilbc.o \
rtpdec_jpeg.o \
rtpdec_latm.o \
rtpdec_mpeg12.o \
rtpdec_mpeg4.o \
rtpdec_mpegts.o \
rtpdec_qcelp.o \

38
libavformat/rtpdec.c
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@ -74,6 +74,8 @@ void av_register_rtp_dynamic_payload_handlers(void)
ff_register_dynamic_payload_handler(&ff_jpeg_dynamic_handler);
ff_register_dynamic_payload_handler(&ff_mp4a_latm_dynamic_handler);
ff_register_dynamic_payload_handler(&ff_mp4v_es_dynamic_handler);
ff_register_dynamic_payload_handler(&ff_mpeg_audio_dynamic_handler);
ff_register_dynamic_payload_handler(&ff_mpeg_video_dynamic_handler);
ff_register_dynamic_payload_handler(&ff_mpeg4_generic_dynamic_handler);
ff_register_dynamic_payload_handler(&ff_mpegts_dynamic_handler);
ff_register_dynamic_payload_handler(&ff_ms_rtp_asf_pfv_handler);
@ -583,7 +585,7 @@ static void finalize_packet(RTPDemuxContext *s, AVPacket *pkt, uint32_t timestam
static int rtp_parse_packet_internal(RTPDemuxContext *s, AVPacket *pkt,
const uint8_t *buf, int len)
{
unsigned int ssrc, h;
unsigned int ssrc;
int payload_type, seq, flags = 0;
int ext;
AVStream *st;
@ -645,42 +647,8 @@ static int rtp_parse_packet_internal(RTPDemuxContext *s, AVPacket *pkt,
} else if (st) {
/* At this point, the RTP header has been stripped;
* This is ASSUMING that there is only 1 CSRC, which isn't wise. */
switch (st->codec->codec_id) {
case AV_CODEC_ID_MP2:
case AV_CODEC_ID_MP3:
/* better than nothing: skip MPEG audio RTP header */
if (len <= 4)
return -1;
h = AV_RB32(buf);
len -= 4;
buf += 4;
av_new_packet(pkt, len);
memcpy(pkt->data, buf, len);
break;
case AV_CODEC_ID_MPEG1VIDEO:
case AV_CODEC_ID_MPEG2VIDEO:
/* better than nothing: skip MPEG video RTP header */
if (len <= 4)
return -1;
h = AV_RB32(buf);
buf += 4;
len -= 4;
if (h & (1 << 26)) {
/* MPEG-2 */
if (len <= 4)
return -1;
buf += 4;
len -= 4;
}
av_new_packet(pkt, len);
memcpy(pkt->data, buf, len);
break;
default:
av_new_packet(pkt, len);
memcpy(pkt->data, buf, len);
break;
}
pkt->stream_index = st->index;
} else {
return AVERROR(EINVAL);

2
libavformat/rtpdec_formats.h
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@ -49,6 +49,8 @@ extern RTPDynamicProtocolHandler ff_ilbc_dynamic_handler;
extern RTPDynamicProtocolHandler ff_jpeg_dynamic_handler;
extern RTPDynamicProtocolHandler ff_mp4a_latm_dynamic_handler;
extern RTPDynamicProtocolHandler ff_mp4v_es_dynamic_handler;
extern RTPDynamicProtocolHandler ff_mpeg_audio_dynamic_handler;
extern RTPDynamicProtocolHandler ff_mpeg_video_dynamic_handler;
extern RTPDynamicProtocolHandler ff_mpeg4_generic_dynamic_handler;
extern RTPDynamicProtocolHandler ff_mpegts_dynamic_handler;
extern RTPDynamicProtocolHandler ff_ms_rtp_asf_pfa_handler;

62
libavformat/rtpdec_mpeg12.c Normal file
View File

@ -0,0 +1,62 @@
/*
* 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 "rtpdec_formats.h"
#include "libavutil/intreadwrite.h"
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,
.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,
.parse_packet = mpeg_parse_packet,
.static_payload_id = 32,
};