yading@11: /*
yading@11:  * RTP MPEG2TS depacketizer
yading@11:  * Copyright (c) 2003 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 "mpegts.h"
yading@11: #include "rtpdec_formats.h"
yading@11: 
yading@11: struct PayloadContext {
yading@11:     struct MpegTSContext *ts;
yading@11:     int read_buf_index;
yading@11:     int read_buf_size;
yading@11:     uint8_t buf[RTP_MAX_PACKET_LENGTH];
yading@11: };
yading@11: 
yading@11: static PayloadContext *mpegts_new_context(void)
yading@11: {
yading@11:     return av_mallocz(sizeof(PayloadContext));
yading@11: }
yading@11: 
yading@11: static void mpegts_free_context(PayloadContext *data)
yading@11: {
yading@11:     if (!data)
yading@11:         return;
yading@11:     if (data->ts)
yading@11:         ff_mpegts_parse_close(data->ts);
yading@11:     av_free(data);
yading@11: }
yading@11: 
yading@11: static int mpegts_init(AVFormatContext *ctx, int st_index, PayloadContext *data)
yading@11: {
yading@11:     data->ts = ff_mpegts_parse_open(ctx);
yading@11:     if (!data->ts)
yading@11:         return AVERROR(ENOMEM);
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int mpegts_handle_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:     int ret;
yading@11: 
yading@11:     // We don't want to use the RTP timestamps at all. If the mpegts demuxer
yading@11:     // doesn't set any pts/dts, the generic rtpdec code shouldn't try to
yading@11:     // fill it in either, since the mpegts and RTP timestamps are in totally
yading@11:     // different ranges.
yading@11:     *timestamp = RTP_NOTS_VALUE;
yading@11: 
yading@11:     if (!data->ts)
yading@11:         return AVERROR(EINVAL);
yading@11: 
yading@11:     if (!buf) {
yading@11:         if (data->read_buf_index >= data->read_buf_size)
yading@11:             return AVERROR(EAGAIN);
yading@11:         ret = ff_mpegts_parse_packet(data->ts, pkt, data->buf + data->read_buf_index,
yading@11:                                      data->read_buf_size - data->read_buf_index);
yading@11:         if (ret < 0)
yading@11:             return AVERROR(EAGAIN);
yading@11:         data->read_buf_index += ret;
yading@11:         if (data->read_buf_index < data->read_buf_size)
yading@11:             return 1;
yading@11:         else
yading@11:             return 0;
yading@11:     }
yading@11: 
yading@11:     ret = ff_mpegts_parse_packet(data->ts, pkt, buf, len);
yading@11:     /* The only error that can be returned from ff_mpegts_parse_packet
yading@11:      * is "no more data to return from the provided buffer", so return
yading@11:      * AVERROR(EAGAIN) for all errors */
yading@11:     if (ret < 0)
yading@11:         return AVERROR(EAGAIN);
yading@11:     if (ret < len) {
yading@11:         data->read_buf_size = FFMIN(len - ret, sizeof(data->buf));
yading@11:         memcpy(data->buf, buf + ret, data->read_buf_size);
yading@11:         data->read_buf_index = 0;
yading@11:         return 1;
yading@11:     }
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: RTPDynamicProtocolHandler ff_mpegts_dynamic_handler = {
yading@11:     .codec_type        = AVMEDIA_TYPE_DATA,
yading@11:     .parse_packet      = mpegts_handle_packet,
yading@11:     .alloc             = mpegts_new_context,
yading@11:     .init              = mpegts_init,
yading@11:     .free              = mpegts_free_context,
yading@11:     .static_payload_id = 33,
yading@11: };