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 "libavutil/opt.h"
24 #include "avformat.h"
25 #include "avio_internal.h"
26
27 typedef struct MuxChain {
28 const AVClass *class;
29 AVFormatContext *mpegts_ctx;
30 AVFormatContext *rtp_ctx;
31 AVPacket *pkt;
32 AVDictionary* mpegts_muxer_options;
33 AVDictionary* rtp_muxer_options;
34 } MuxChain;
35
rtp_mpegts_write_close(AVFormatContext * s)36 static int rtp_mpegts_write_close(AVFormatContext *s)
37 {
38 MuxChain *chain = s->priv_data;
39
40 if (chain->mpegts_ctx) {
41 av_write_trailer(chain->mpegts_ctx);
42 ffio_free_dyn_buf(&chain->mpegts_ctx->pb);
43 avformat_free_context(chain->mpegts_ctx);
44 }
45 if (chain->rtp_ctx) {
46 av_write_trailer(chain->rtp_ctx);
47 avformat_free_context(chain->rtp_ctx);
48 }
49
50 av_packet_free(&chain->pkt);
51
52 return 0;
53 }
54
rtp_mpegts_write_header(AVFormatContext * s)55 static int rtp_mpegts_write_header(AVFormatContext *s)
56 {
57 MuxChain *chain = s->priv_data;
58 AVFormatContext *mpegts_ctx = NULL, *rtp_ctx = NULL;
59 ff_const59 AVOutputFormat *mpegts_format = av_guess_format("mpegts", NULL, NULL);
60 ff_const59 AVOutputFormat *rtp_format = av_guess_format("rtp", NULL, NULL);
61 int i, ret = AVERROR(ENOMEM);
62 AVStream *st;
63 AVDictionary *mpegts_muxer_options = NULL;
64 AVDictionary *rtp_muxer_options = NULL;
65
66 if (!mpegts_format || !rtp_format)
67 return AVERROR(ENOSYS);
68 mpegts_ctx = avformat_alloc_context();
69 if (!mpegts_ctx)
70 return AVERROR(ENOMEM);
71 chain->pkt = av_packet_alloc();
72 if (!chain->pkt)
73 goto fail;
74 mpegts_ctx->oformat = mpegts_format;
75 mpegts_ctx->max_delay = s->max_delay;
76 av_dict_copy(&mpegts_ctx->metadata, s->metadata, 0);
77 for (i = 0; i < s->nb_streams; i++) {
78 AVStream* st = avformat_new_stream(mpegts_ctx, NULL);
79 if (!st)
80 goto fail;
81 st->time_base = s->streams[i]->time_base;
82 st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
83 st->id = s->streams[i]->id;
84 avcodec_parameters_copy(st->codecpar, s->streams[i]->codecpar);
85 }
86 if ((ret = avio_open_dyn_buf(&mpegts_ctx->pb)) < 0)
87 goto fail;
88
89 av_dict_copy(&mpegts_muxer_options, chain->mpegts_muxer_options, 0);
90
91 ret = avformat_write_header(mpegts_ctx, &mpegts_muxer_options);
92 av_dict_free(&mpegts_muxer_options);
93 if (ret < 0)
94 goto fail;
95
96 for (i = 0; i < s->nb_streams; i++)
97 s->streams[i]->time_base = mpegts_ctx->streams[i]->time_base;
98
99 chain->mpegts_ctx = mpegts_ctx;
100 mpegts_ctx = NULL;
101
102 rtp_ctx = avformat_alloc_context();
103 if (!rtp_ctx) {
104 ret = AVERROR(ENOMEM);
105 goto fail;
106 }
107 rtp_ctx->oformat = rtp_format;
108 st = avformat_new_stream(rtp_ctx, NULL);
109 if (!st) {
110 ret = AVERROR(ENOMEM);
111 goto fail;
112 }
113 st->time_base.num = 1;
114 st->time_base.den = 90000;
115 st->codecpar->codec_id = AV_CODEC_ID_MPEG2TS;
116 rtp_ctx->pb = s->pb;
117 av_dict_copy(&rtp_muxer_options, chain->rtp_muxer_options, 0);
118 ret = avformat_write_header(rtp_ctx, &rtp_muxer_options);
119 av_dict_free(&rtp_muxer_options);
120 if (ret < 0)
121 goto fail;
122
123 chain->rtp_ctx = rtp_ctx;
124
125 return 0;
126
127 fail:
128 if (mpegts_ctx) {
129 ffio_free_dyn_buf(&mpegts_ctx->pb);
130 av_dict_free(&mpegts_ctx->metadata);
131 avformat_free_context(mpegts_ctx);
132 }
133 avformat_free_context(rtp_ctx);
134 rtp_mpegts_write_close(s);
135 return ret;
136 }
137
rtp_mpegts_write_packet(AVFormatContext * s,AVPacket * pkt)138 static int rtp_mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
139 {
140 MuxChain *chain = s->priv_data;
141 int ret = 0, size;
142 uint8_t *buf;
143 AVPacket *local_pkt = chain->pkt;
144
145 if (!chain->mpegts_ctx->pb) {
146 if ((ret = avio_open_dyn_buf(&chain->mpegts_ctx->pb)) < 0)
147 return ret;
148 }
149 if ((ret = av_write_frame(chain->mpegts_ctx, pkt)) < 0)
150 return ret;
151 size = avio_close_dyn_buf(chain->mpegts_ctx->pb, &buf);
152 chain->mpegts_ctx->pb = NULL;
153 if (size == 0) {
154 av_free(buf);
155 return 0;
156 }
157 av_packet_unref(local_pkt);
158 local_pkt->data = buf;
159 local_pkt->size = size;
160 local_pkt->stream_index = 0;
161 if (pkt->pts != AV_NOPTS_VALUE)
162 local_pkt->pts = av_rescale_q(pkt->pts,
163 s->streams[pkt->stream_index]->time_base,
164 chain->rtp_ctx->streams[0]->time_base);
165 if (pkt->dts != AV_NOPTS_VALUE)
166 local_pkt->dts = av_rescale_q(pkt->dts,
167 s->streams[pkt->stream_index]->time_base,
168 chain->rtp_ctx->streams[0]->time_base);
169 ret = av_write_frame(chain->rtp_ctx, local_pkt);
170 av_free(buf);
171
172 return ret;
173 }
174
175 #define OFFSET(x) offsetof(MuxChain, x)
176 #define E AV_OPT_FLAG_ENCODING_PARAM
177 static const AVOption options[] = {
178 { "mpegts_muxer_options", "set list of options for the MPEG-TS muxer", OFFSET(mpegts_muxer_options), AV_OPT_TYPE_DICT, {.str = NULL}, 0, 0, E },
179 { "rtp_muxer_options", "set list of options for the RTP muxer", OFFSET(rtp_muxer_options), AV_OPT_TYPE_DICT, {.str = NULL}, 0, 0, E },
180 { NULL },
181 };
182
183 static const AVClass rtp_mpegts_class = {
184 .class_name = "rtp_mpegts muxer",
185 .item_name = av_default_item_name,
186 .option = options,
187 .version = LIBAVUTIL_VERSION_INT,
188 };
189
190 AVOutputFormat ff_rtp_mpegts_muxer = {
191 .name = "rtp_mpegts",
192 .long_name = NULL_IF_CONFIG_SMALL("RTP/mpegts output format"),
193 .priv_data_size = sizeof(MuxChain),
194 .audio_codec = AV_CODEC_ID_AAC,
195 .video_codec = AV_CODEC_ID_MPEG4,
196 .write_header = rtp_mpegts_write_header,
197 .write_packet = rtp_mpegts_write_packet,
198 .write_trailer = rtp_mpegts_write_close,
199 .priv_class = &rtp_mpegts_class,
200 };
201