libavformat/rtpenc_mpegts.c

   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/mem.h"
  24 #include "libavutil/opt.h"
  25 #include "avformat.h"
  26 #include "avio_internal.h"
  27 #include "mux.h"
  28
  29 typedef struct MuxChain {
  30     const AVClass *class;
  31     AVFormatContext *mpegts_ctx;
  32     AVFormatContext *rtp_ctx;
  33     AVPacket *pkt;
  34     AVDictionary* mpegts_muxer_options;
  35     AVDictionary* rtp_muxer_options;
  36 } MuxChain;
  37
  38 static int rtp_mpegts_write_close(AVFormatContext *s)
  39 {
  40     MuxChain *chain = s->priv_data;
  41
  42     if (chain->mpegts_ctx) {
  43         av_write_trailer(chain->mpegts_ctx);
  44         ffio_free_dyn_buf(&chain->mpegts_ctx->pb);
  45         avformat_free_context(chain->mpegts_ctx);
  46     }
  47     if (chain->rtp_ctx) {
  48         av_write_trailer(chain->rtp_ctx);
  49         avformat_free_context(chain->rtp_ctx);
  50     }
  51
  52     av_packet_free(&chain->pkt);
  53
  54     return 0;
  55 }
  56
  57 static int rtp_mpegts_write_header(AVFormatContext *s)
  58 {
  59     MuxChain *chain = s->priv_data;
  60     AVFormatContext *mpegts_ctx = NULL, *rtp_ctx = NULL;
  61     const AVOutputFormat *mpegts_format = av_guess_format("mpegts", NULL, NULL);
  62     const AVOutputFormat *rtp_format    = av_guess_format("rtp", NULL, NULL);
  63     int i, ret = AVERROR(ENOMEM);
  64     AVStream *st;
  65     AVDictionary *mpegts_muxer_options = NULL;
  66     AVDictionary *rtp_muxer_options = NULL;
  67
  68     if (!mpegts_format || !rtp_format)
  69         return AVERROR(ENOSYS);
  70     mpegts_ctx = avformat_alloc_context();
  71     if (!mpegts_ctx)
  72         return AVERROR(ENOMEM);
  73     chain->pkt = av_packet_alloc();
  74     if (!chain->pkt)
  75         goto fail;
  76     mpegts_ctx->oformat   = mpegts_format;
  77     mpegts_ctx->max_delay = s->max_delay;
  78     av_dict_copy(&mpegts_ctx->metadata, s->metadata, 0);
  79     for (i = 0; i < s->nb_streams; i++) {
  80         AVStream* st = avformat_new_stream(mpegts_ctx, NULL);
  81         if (!st)
  82             goto fail;
  83         st->time_base           = s->streams[i]->time_base;
  84         st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
  85         st->id                  = s->streams[i]->id;
  86         avcodec_parameters_copy(st->codecpar, s->streams[i]->codecpar);
  87     }
  88     if ((ret = avio_open_dyn_buf(&mpegts_ctx->pb)) < 0)
  89         goto fail;
  90
  91     av_dict_copy(&mpegts_muxer_options, chain->mpegts_muxer_options, 0);
  92
  93     ret = avformat_write_header(mpegts_ctx, &mpegts_muxer_options);
  94     av_dict_free(&mpegts_muxer_options);
  95     if (ret < 0)
  96         goto fail;
  97
  98     for (i = 0; i < s->nb_streams; i++)
  99         s->streams[i]->time_base = mpegts_ctx->streams[i]->time_base;
 100
 101     chain->mpegts_ctx = mpegts_ctx;
 102     mpegts_ctx = NULL;
 103
 104     rtp_ctx = avformat_alloc_context();
 105     if (!rtp_ctx) {
 106         ret = AVERROR(ENOMEM);
 107         goto fail;
 108     }
 109     rtp_ctx->oformat = rtp_format;
 110     st = avformat_new_stream(rtp_ctx, NULL);
 111     if (!st) {
 112         ret = AVERROR(ENOMEM);
 113         goto fail;
 114     }
 115     st->time_base.num   = 1;
 116     st->time_base.den   = 90000;
 117     st->codecpar->codec_id = AV_CODEC_ID_MPEG2TS;
 118     rtp_ctx->pb = s->pb;
 119     av_dict_copy(&rtp_muxer_options, chain->rtp_muxer_options, 0);
 120     ret = avformat_write_header(rtp_ctx, &rtp_muxer_options);
 121     av_dict_free(&rtp_muxer_options);
 122     if (ret < 0)
 123         goto fail;
 124
 125     chain->rtp_ctx = rtp_ctx;
 126
 127     return 0;
 128
 129 fail:
 130     if (mpegts_ctx) {
 131         ffio_free_dyn_buf(&mpegts_ctx->pb);
 132         av_dict_free(&mpegts_ctx->metadata);
 133         avformat_free_context(mpegts_ctx);
 134     }
 135     avformat_free_context(rtp_ctx);
 136     rtp_mpegts_write_close(s);
 137     return ret;
 138 }
 139
 140 static int rtp_mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
 141 {
 142     MuxChain *chain = s->priv_data;
 143     int ret = 0, size;
 144     uint8_t *buf;
 145     AVPacket *local_pkt = chain->pkt;
 146
 147     if (!chain->mpegts_ctx->pb) {
 148         if ((ret = avio_open_dyn_buf(&chain->mpegts_ctx->pb)) < 0)
 149             return ret;
 150     }
 151     if ((ret = av_write_frame(chain->mpegts_ctx, pkt)) < 0)
 152         return ret;
 153     size = avio_close_dyn_buf(chain->mpegts_ctx->pb, &buf);
 154     chain->mpegts_ctx->pb = NULL;
 155     if (size == 0) {
 156         av_free(buf);
 157         return 0;
 158     }
 159     av_packet_unref(local_pkt);
 160     local_pkt->data         = buf;
 161     local_pkt->size         = size;
 162     local_pkt->stream_index = 0;
 163     if (pkt->pts != AV_NOPTS_VALUE)
 164         local_pkt->pts = av_rescale_q(pkt->pts,
 165                                      s->streams[pkt->stream_index]->time_base,
 166                                      chain->rtp_ctx->streams[0]->time_base);
 167     if (pkt->dts != AV_NOPTS_VALUE)
 168         local_pkt->dts = av_rescale_q(pkt->dts,
 169                                      s->streams[pkt->stream_index]->time_base,
 170                                      chain->rtp_ctx->streams[0]->time_base);
 171     ret = av_write_frame(chain->rtp_ctx, local_pkt);
 172     av_free(buf);
 173
 174     return ret;
 175 }
 176
 177 #define OFFSET(x) offsetof(MuxChain, x)
 178 #define E AV_OPT_FLAG_ENCODING_PARAM
 179 static const AVOption options[] = {
 180     { "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 },
 181     { "rtp_muxer_options",    "set list of options for the RTP muxer",     OFFSET(rtp_muxer_options),    AV_OPT_TYPE_DICT, {.str = NULL}, 0, 0, E },
 182     { NULL },
 183 };
 184
 185 static const AVClass rtp_mpegts_class = {
 186     .class_name = "rtp_mpegts muxer",
 187     .item_name  = av_default_item_name,
 188     .option     = options,
 189     .version    = LIBAVUTIL_VERSION_INT,
 190 };
 191
 192 const FFOutputFormat ff_rtp_mpegts_muxer = {
 193     .p.name            = "rtp_mpegts",
 194     .p.long_name       = NULL_IF_CONFIG_SMALL("RTP/mpegts output format"),
 195     .priv_data_size    = sizeof(MuxChain),
 196     .p.audio_codec     = AV_CODEC_ID_AAC,
 197     .p.video_codec     = AV_CODEC_ID_MPEG4,
 198     .write_header      = rtp_mpegts_write_header,
 199     .write_packet      = rtp_mpegts_write_packet,
 200     .write_trailer     = rtp_mpegts_write_close,
 201     .p.priv_class      = &rtp_mpegts_class,
 202 };