1/* 2 * Common code for the RTP depacketization of MPEG-1/2 formats. 3 * Copyright (c) 2002 Fabrice Bellard 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#include "libavutil/attributes.h" 23#include "libavutil/intreadwrite.h" 24#include "rtpdec_formats.h" 25 26static av_cold int mpeg_init(AVFormatContext *ctx, int st_index, PayloadContext *data) 27{ 28 if (st_index < 0) 29 return 0; 30 ctx->streams[st_index]->need_parsing = AVSTREAM_PARSE_FULL; 31 return 0; 32} 33 34static int mpeg_parse_packet(AVFormatContext *ctx, PayloadContext *data, 35 AVStream *st, AVPacket *pkt, uint32_t *timestamp, 36 const uint8_t *buf, int len, uint16_t seq, 37 int flags) 38{ 39 unsigned int h; 40 if (len <= 4) 41 return AVERROR_INVALIDDATA; 42 h = AV_RB32(buf); 43 buf += 4; 44 len -= 4; 45 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && h & (1 << 26)) { 46 /* MPEG-2 */ 47 if (len <= 4) 48 return AVERROR_INVALIDDATA; 49 buf += 4; 50 len -= 4; 51 } 52 if (av_new_packet(pkt, len) < 0) 53 return AVERROR(ENOMEM); 54 memcpy(pkt->data, buf, len); 55 pkt->stream_index = st->index; 56 return 0; 57} 58 59RTPDynamicProtocolHandler ff_mpeg_audio_dynamic_handler = { 60 .codec_type = AVMEDIA_TYPE_AUDIO, 61 .codec_id = AV_CODEC_ID_MP3, 62 .init = mpeg_init, 63 .parse_packet = mpeg_parse_packet, 64 .static_payload_id = 14, 65}; 66 67RTPDynamicProtocolHandler ff_mpeg_video_dynamic_handler = { 68 .codec_type = AVMEDIA_TYPE_VIDEO, 69 .codec_id = AV_CODEC_ID_MPEG2VIDEO, 70 .init = mpeg_init, 71 .parse_packet = mpeg_parse_packet, 72 .static_payload_id = 32, 73}; 74