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
27typedef 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
36static 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
55static int rtp_mpegts_write_header(AVFormatContext *s)
56{
57    MuxChain *chain = s->priv_data;
58    AVFormatContext *mpegts_ctx = NULL, *rtp_ctx = NULL;
59    const AVOutputFormat *mpegts_format = av_guess_format("mpegts", NULL, NULL);
60    const 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
127fail:
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
138static 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
177static 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
183static 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
190const 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