path: root/libavformat/rtpenc_mpegts.c (plain)
blob: 7af02e0d2fba23290200c0db660f00bbee54d76a

1	/*
2	* RTP/mpegts muxer
3	* Copyright (c) 2011 Martin Storsjo
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/mathematics.h"
23	#include "avformat.h"
24	#include "avio_internal.h"
25
26	struct MuxChain {
27	AVFormatContext *mpegts_ctx;
28	AVFormatContext *rtp_ctx;
29	};
30
31	static int rtp_mpegts_write_close(AVFormatContext *s)
32	{
33	struct MuxChain *chain = s->priv_data;
34
35	if (chain->mpegts_ctx) {
36	av_write_trailer(chain->mpegts_ctx);
37	ffio_free_dyn_buf(&chain->mpegts_ctx->pb);
38	avformat_free_context(chain->mpegts_ctx);
39	}
40	if (chain->rtp_ctx) {
41	av_write_trailer(chain->rtp_ctx);
42	avformat_free_context(chain->rtp_ctx);
43	}
44	return 0;
45	}
46
47	static int rtp_mpegts_write_header(AVFormatContext *s)
48	{
49	struct MuxChain *chain = s->priv_data;
50	AVFormatContext *mpegts_ctx = NULL, *rtp_ctx = NULL;
51	AVOutputFormat *mpegts_format = av_guess_format("mpegts", NULL, NULL);
52	AVOutputFormat *rtp_format = av_guess_format("rtp", NULL, NULL);
53	int i, ret = AVERROR(ENOMEM);
54	AVStream *st;
55
56	if (!mpegts_format || !rtp_format)
57	return AVERROR(ENOSYS);
58	mpegts_ctx = avformat_alloc_context();
59	if (!mpegts_ctx)
60	return AVERROR(ENOMEM);
61	mpegts_ctx->oformat = mpegts_format;
62	mpegts_ctx->max_delay = s->max_delay;
63	for (i = 0; i < s->nb_streams; i++) {
64	AVStream* st = avformat_new_stream(mpegts_ctx, NULL);
65	if (!st)
66	goto fail;
67	st->time_base = s->streams[i]->time_base;
68	st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
69	avcodec_parameters_copy(st->codecpar, s->streams[i]->codecpar);
70	}
71	if ((ret = avio_open_dyn_buf(&mpegts_ctx->pb)) < 0)
72	goto fail;
73	if ((ret = avformat_write_header(mpegts_ctx, NULL)) < 0)
74	goto fail;
75	for (i = 0; i < s->nb_streams; i++)
76	s->streams[i]->time_base = mpegts_ctx->streams[i]->time_base;
77
78	chain->mpegts_ctx = mpegts_ctx;
79	mpegts_ctx = NULL;
80
81	rtp_ctx = avformat_alloc_context();
82	if (!rtp_ctx) {
83	ret = AVERROR(ENOMEM);
84	goto fail;
85	}
86	rtp_ctx->oformat = rtp_format;
87	st = avformat_new_stream(rtp_ctx, NULL);
88	st->time_base.num = 1;
89	st->time_base.den = 90000;
90	st->codecpar->codec_id = AV_CODEC_ID_MPEG2TS;
91	rtp_ctx->pb = s->pb;
92	if ((ret = avformat_write_header(rtp_ctx, NULL)) < 0)
93	goto fail;
94	chain->rtp_ctx = rtp_ctx;
95
96	return 0;
97
98	fail:
99	if (mpegts_ctx) {
100	ffio_free_dyn_buf(&mpegts_ctx->pb);
101	avformat_free_context(mpegts_ctx);
102	}
103	if (rtp_ctx)
104	avformat_free_context(rtp_ctx);
105	rtp_mpegts_write_close(s);
106	return ret;
107	}
108
109	static int rtp_mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
110	{
111	struct MuxChain *chain = s->priv_data;
112	int ret = 0, size;
113	uint8_t *buf;
114	AVPacket local_pkt;
115
116	if (!chain->mpegts_ctx->pb) {
117	if ((ret = avio_open_dyn_buf(&chain->mpegts_ctx->pb)) < 0)
118	return ret;
119	}
120	if ((ret = av_write_frame(chain->mpegts_ctx, pkt)) < 0)
121	return ret;
122	size = avio_close_dyn_buf(chain->mpegts_ctx->pb, &buf);
123	chain->mpegts_ctx->pb = NULL;
124	if (size == 0) {
125	av_free(buf);
126	return 0;
127	}
128	av_init_packet(&local_pkt);
129	local_pkt.data = buf;
130	local_pkt.size = size;
131	local_pkt.stream_index = 0;
132	if (pkt->pts != AV_NOPTS_VALUE)
133	local_pkt.pts = av_rescale_q(pkt->pts,
134	s->streams[pkt->stream_index]->time_base,
135	chain->rtp_ctx->streams[0]->time_base);
136	if (pkt->dts != AV_NOPTS_VALUE)
137	local_pkt.dts = av_rescale_q(pkt->dts,
138	s->streams[pkt->stream_index]->time_base,
139	chain->rtp_ctx->streams[0]->time_base);
140	ret = av_write_frame(chain->rtp_ctx, &local_pkt);
141	av_free(buf);
142
143	return ret;
144	}
145
146	AVOutputFormat ff_rtp_mpegts_muxer = {
147	.name = "rtp_mpegts",
148	.long_name = NULL_IF_CONFIG_SMALL("RTP/mpegts output format"),
149	.priv_data_size = sizeof(struct MuxChain),
150	.audio_codec = AV_CODEC_ID_AAC,
151	.video_codec = AV_CODEC_ID_MPEG4,
152	.write_header = rtp_mpegts_write_header,
153	.write_packet = rtp_mpegts_write_packet,
154	.write_trailer = rtp_mpegts_write_close,
155	};
156