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67 lines
2.2 KiB
C
67 lines
2.2 KiB
C
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/*
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* Common code for the RTP depacketization of MPEG-1/2 formats.
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* Copyright (c) 2002 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/attributes.h"
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#include "libavutil/intreadwrite.h"
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#include "rtpdec_formats.h"
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static int mpeg_parse_packet(AVFormatContext *ctx, PayloadContext *data,
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AVStream *st, AVPacket *pkt, uint32_t *timestamp,
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const uint8_t *buf, int len, uint16_t seq,
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int flags)
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{
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unsigned int h;
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int ret;
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if (len <= 4)
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return AVERROR_INVALIDDATA;
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h = AV_RB32(buf);
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buf += 4;
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len -= 4;
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if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && h & (1 << 26)) {
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/* MPEG-2 */
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if (len <= 4)
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return AVERROR_INVALIDDATA;
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buf += 4;
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len -= 4;
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}
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if ((ret = av_new_packet(pkt, len)) < 0)
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return ret;
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memcpy(pkt->data, buf, len);
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pkt->stream_index = st->index;
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return 0;
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}
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const RTPDynamicProtocolHandler ff_mpeg_audio_dynamic_handler = {
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.codec_type = AVMEDIA_TYPE_AUDIO,
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.codec_id = AV_CODEC_ID_MP3,
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.need_parsing = AVSTREAM_PARSE_FULL,
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.parse_packet = mpeg_parse_packet,
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.static_payload_id = 14,
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};
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const RTPDynamicProtocolHandler ff_mpeg_video_dynamic_handler = {
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.codec_type = AVMEDIA_TYPE_VIDEO,
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.codec_id = AV_CODEC_ID_MPEG2VIDEO,
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.need_parsing = AVSTREAM_PARSE_FULL,
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.parse_packet = mpeg_parse_packet,
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.static_payload_id = 32,
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};
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