yading@11: /*
yading@11:  * Common code for the RTP depacketization of MPEG-1/2 formats.
yading@11:  * Copyright (c) 2002 Fabrice Bellard
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "rtpdec_formats.h"
yading@11: #include "libavutil/intreadwrite.h"
yading@11: 
yading@11: static int mpeg_init(AVFormatContext *ctx, int st_index, PayloadContext *data)
yading@11: {
yading@11:     if (st_index < 0)
yading@11:         return 0;
yading@11:     ctx->streams[st_index]->need_parsing = AVSTREAM_PARSE_FULL;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int mpeg_parse_packet(AVFormatContext *ctx, PayloadContext *data,
yading@11:                              AVStream *st, AVPacket *pkt, uint32_t *timestamp,
yading@11:                              const uint8_t *buf, int len, uint16_t seq,
yading@11:                              int flags)
yading@11: {
yading@11:     unsigned int h;
yading@11:     if (len <= 4)
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     h    = AV_RB32(buf);
yading@11:     buf += 4;
yading@11:     len -= 4;
yading@11:     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && h & (1 << 26)) {
yading@11:         /* MPEG-2 */
yading@11:         if (len <= 4)
yading@11:             return AVERROR_INVALIDDATA;
yading@11:         buf += 4;
yading@11:         len -= 4;
yading@11:     }
yading@11:     if (av_new_packet(pkt, len) < 0)
yading@11:         return AVERROR(ENOMEM);
yading@11:     memcpy(pkt->data, buf, len);
yading@11:     pkt->stream_index = st->index;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: RTPDynamicProtocolHandler ff_mpeg_audio_dynamic_handler = {
yading@11:     .codec_type        = AVMEDIA_TYPE_AUDIO,
yading@11:     .codec_id          = AV_CODEC_ID_MP3,
yading@11:     .init              = mpeg_init,
yading@11:     .parse_packet      = mpeg_parse_packet,
yading@11:     .static_payload_id = 14,
yading@11: };
yading@11: 
yading@11: RTPDynamicProtocolHandler ff_mpeg_video_dynamic_handler = {
yading@11:     .codec_type        = AVMEDIA_TYPE_VIDEO,
yading@11:     .codec_id          = AV_CODEC_ID_MPEG2VIDEO,
yading@11:     .init              = mpeg_init,
yading@11:     .parse_packet      = mpeg_parse_packet,
yading@11:     .static_payload_id = 32,
yading@11: };