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libavformat/rtpenc_chain.c

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00001 /*
00002  * RTP muxer chaining code
00003  * Copyright (c) 2010 Martin Storsjo
00004  *
00005  * This file is part of Libav.
00006  *
00007  * Libav is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * Libav is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with Libav; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #include "avformat.h"
00023 #include "avio_internal.h"
00024 #include "rtpenc_chain.h"
00025 #include "avio_internal.h"
00026 #include "libavutil/opt.h"
00027 
00028 AVFormatContext *ff_rtp_chain_mux_open(AVFormatContext *s, AVStream *st,
00029                                        URLContext *handle, int packet_size)
00030 {
00031     AVFormatContext *rtpctx;
00032     int ret;
00033     AVOutputFormat *rtp_format = av_guess_format("rtp", NULL, NULL);
00034     uint8_t *rtpflags;
00035     AVDictionary *opts = NULL;
00036 
00037     if (!rtp_format)
00038         return NULL;
00039 
00040     /* Allocate an AVFormatContext for each output stream */
00041     rtpctx = avformat_alloc_context();
00042     if (!rtpctx)
00043         return NULL;
00044 
00045     rtpctx->oformat = rtp_format;
00046     if (!avformat_new_stream(rtpctx, NULL)) {
00047         av_free(rtpctx);
00048         return NULL;
00049     }
00050     /* Pass the interrupt callback on */
00051     rtpctx->interrupt_callback = s->interrupt_callback;
00052     /* Copy the max delay setting; the rtp muxer reads this. */
00053     rtpctx->max_delay = s->max_delay;
00054     /* Copy other stream parameters. */
00055     rtpctx->streams[0]->sample_aspect_ratio = st->sample_aspect_ratio;
00056 
00057     if (av_opt_get(s, "rtpflags", AV_OPT_SEARCH_CHILDREN, &rtpflags) >= 0)
00058         av_dict_set(&opts, "rtpflags", rtpflags, AV_DICT_DONT_STRDUP_VAL);
00059 
00060     /* Set the synchronized start time. */
00061     rtpctx->start_time_realtime = s->start_time_realtime;
00062 
00063     avcodec_copy_context(rtpctx->streams[0]->codec, st->codec);
00064 
00065     if (handle) {
00066         ffio_fdopen(&rtpctx->pb, handle);
00067     } else
00068         ffio_open_dyn_packet_buf(&rtpctx->pb, packet_size);
00069     ret = avformat_write_header(rtpctx, &opts);
00070     av_dict_free(&opts);
00071 
00072     if (ret) {
00073         if (handle) {
00074             avio_close(rtpctx->pb);
00075         } else {
00076             uint8_t *ptr;
00077             avio_close_dyn_buf(rtpctx->pb, &ptr);
00078             av_free(ptr);
00079         }
00080         avformat_free_context(rtpctx);
00081         return NULL;
00082     }
00083 
00084     return rtpctx;
00085 }
00086 
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