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 "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     ff_const59 AVOutputFormat *mpegts_format = av_guess_format("mpegts", NULL, NULL);
  52     ff_const59 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     av_dict_copy(&mpegts_ctx->metadata, s->metadata, 0);
  64     for (i = 0; i < s->nb_streams; i++) {
  65         AVStream* st = avformat_new_stream(mpegts_ctx, NULL);
  66         if (!st)
  67             goto fail;
  68         st->time_base           = s->streams[i]->time_base;
  69         st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
  70         avcodec_parameters_copy(st->codecpar, s->streams[i]->codecpar);
  71     }
  72     if ((ret = avio_open_dyn_buf(&mpegts_ctx->pb)) < 0)
  73         goto fail;
  74     if ((ret = avformat_write_header(mpegts_ctx, NULL)) < 0)
  75         goto fail;
  76     for (i = 0; i < s->nb_streams; i++)
  77         s->streams[i]->time_base = mpegts_ctx->streams[i]->time_base;
  78
  79     chain->mpegts_ctx = mpegts_ctx;
  80     mpegts_ctx = NULL;
  81
  82     rtp_ctx = avformat_alloc_context();
  83     if (!rtp_ctx) {
  84         ret = AVERROR(ENOMEM);
  85         goto fail;
  86     }
  87     rtp_ctx->oformat = rtp_format;
  88     st = avformat_new_stream(rtp_ctx, NULL);
  89     if (!st) {
  90         ret = AVERROR(ENOMEM);
  91         goto fail;
  92     }
  93     st->time_base.num   = 1;
  94     st->time_base.den   = 90000;
  95     st->codecpar->codec_id = AV_CODEC_ID_MPEG2TS;
  96     rtp_ctx->pb = s->pb;
  97     if ((ret = avformat_write_header(rtp_ctx, NULL)) < 0)
  98         goto fail;
  99     chain->rtp_ctx = rtp_ctx;
 100
 101     return 0;
 102
 103 fail:
 104     if (mpegts_ctx) {
 105         ffio_free_dyn_buf(&mpegts_ctx->pb);
 106         av_dict_free(&mpegts_ctx->metadata);
 107         avformat_free_context(mpegts_ctx);
 108     }
 109     avformat_free_context(rtp_ctx);
 110     rtp_mpegts_write_close(s);
 111     return ret;
 112 }
 113
 114 static int rtp_mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
 115 {
 116     struct MuxChain *chain = s->priv_data;
 117     int ret = 0, size;
 118     uint8_t *buf;
 119     AVPacket local_pkt;
 120
 121     if (!chain->mpegts_ctx->pb) {
 122         if ((ret = avio_open_dyn_buf(&chain->mpegts_ctx->pb)) < 0)
 123             return ret;
 124     }
 125     if ((ret = av_write_frame(chain->mpegts_ctx, pkt)) < 0)
 126         return ret;
 127     size = avio_close_dyn_buf(chain->mpegts_ctx->pb, &buf);
 128     chain->mpegts_ctx->pb = NULL;
 129     if (size == 0) {
 130         av_free(buf);
 131         return 0;
 132     }
 133     av_init_packet(&local_pkt);
 134     local_pkt.data         = buf;
 135     local_pkt.size         = size;
 136     local_pkt.stream_index = 0;
 137     if (pkt->pts != AV_NOPTS_VALUE)
 138         local_pkt.pts = av_rescale_q(pkt->pts,
 139                                      s->streams[pkt->stream_index]->time_base,
 140                                      chain->rtp_ctx->streams[0]->time_base);
 141     if (pkt->dts != AV_NOPTS_VALUE)
 142         local_pkt.dts = av_rescale_q(pkt->dts,
 143                                      s->streams[pkt->stream_index]->time_base,
 144                                      chain->rtp_ctx->streams[0]->time_base);
 145     ret = av_write_frame(chain->rtp_ctx, &local_pkt);
 146     av_free(buf);
 147
 148     return ret;
 149 }
 150
 151 AVOutputFormat ff_rtp_mpegts_muxer = {
 152     .name              = "rtp_mpegts",
 153     .long_name         = NULL_IF_CONFIG_SMALL("RTP/mpegts output format"),
 154     .priv_data_size    = sizeof(struct MuxChain),
 155     .audio_codec       = AV_CODEC_ID_AAC,
 156     .video_codec       = AV_CODEC_ID_MPEG4,
 157     .write_header      = rtp_mpegts_write_header,
 158     .write_packet      = rtp_mpegts_write_packet,
 159     .write_trailer     = rtp_mpegts_write_close,
 160 };