rtpenc_mpegts.c 4.95 KB
Newer Older
1 2 3 4
/*
 * RTP/mpegts muxer
 * Copyright (c) 2011 Martin Storsjo
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8 9 10 11
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
12
 * FFmpeg is distributed in the hope that it will be useful,
13 14 15 16 17
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * 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 20 21 22 23
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "libavutil/mathematics.h"
#include "avformat.h"
24
#include "avio_internal.h"
25 26 27 28 29 30 31 32 33 34 35

struct MuxChain {
    AVFormatContext *mpegts_ctx;
    AVFormatContext *rtp_ctx;
};

static int rtp_mpegts_write_close(AVFormatContext *s)
{
    struct MuxChain *chain = s->priv_data;

    if (chain->mpegts_ctx) {
36
        av_write_trailer(chain->mpegts_ctx);
37
        ffio_free_dyn_buf(&chain->mpegts_ctx->pb);
38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93
        avformat_free_context(chain->mpegts_ctx);
    }
    if (chain->rtp_ctx) {
        av_write_trailer(chain->rtp_ctx);
        avformat_free_context(chain->rtp_ctx);
    }
    return 0;
}

static int rtp_mpegts_write_header(AVFormatContext *s)
{
    struct MuxChain *chain = s->priv_data;
    AVFormatContext *mpegts_ctx = NULL, *rtp_ctx = NULL;
    AVOutputFormat *mpegts_format = av_guess_format("mpegts", NULL, NULL);
    AVOutputFormat *rtp_format    = av_guess_format("rtp", NULL, NULL);
    int i, ret = AVERROR(ENOMEM);
    AVStream *st;

    if (!mpegts_format || !rtp_format)
        return AVERROR(ENOSYS);
    mpegts_ctx = avformat_alloc_context();
    if (!mpegts_ctx)
        return AVERROR(ENOMEM);
    mpegts_ctx->oformat   = mpegts_format;
    mpegts_ctx->max_delay = s->max_delay;
    for (i = 0; i < s->nb_streams; i++) {
        AVStream* st = avformat_new_stream(mpegts_ctx, NULL);
        if (!st)
            goto fail;
        st->time_base           = s->streams[i]->time_base;
        st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
        avcodec_copy_context(st->codec, s->streams[i]->codec);
    }
    if ((ret = avio_open_dyn_buf(&mpegts_ctx->pb)) < 0)
        goto fail;
    if ((ret = avformat_write_header(mpegts_ctx, NULL)) < 0)
        goto fail;
    for (i = 0; i < s->nb_streams; i++)
        s->streams[i]->time_base = mpegts_ctx->streams[i]->time_base;

    chain->mpegts_ctx = mpegts_ctx;
    mpegts_ctx = NULL;

    rtp_ctx = avformat_alloc_context();
    if (!rtp_ctx) {
        ret = AVERROR(ENOMEM);
        goto fail;
    }
    rtp_ctx->oformat = rtp_format;
    st = avformat_new_stream(rtp_ctx, NULL);
    st->time_base.num   = 1;
    st->time_base.den   = 90000;
    st->codec->codec_id = AV_CODEC_ID_MPEG2TS;
    rtp_ctx->pb = s->pb;
    if ((ret = avformat_write_header(rtp_ctx, NULL)) < 0)
        goto fail;
94
    chain->rtp_ctx = rtp_ctx;
95 96 97 98 99

    return 0;

fail:
    if (mpegts_ctx) {
100
        ffio_free_dyn_buf(&mpegts_ctx->pb);
101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155
        avformat_free_context(mpegts_ctx);
    }
    if (rtp_ctx)
        avformat_free_context(rtp_ctx);
    rtp_mpegts_write_close(s);
    return ret;
}

static int rtp_mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
{
    struct MuxChain *chain = s->priv_data;
    int ret = 0, size;
    uint8_t *buf;
    AVPacket local_pkt;

    if (!chain->mpegts_ctx->pb) {
        if ((ret = avio_open_dyn_buf(&chain->mpegts_ctx->pb)) < 0)
            return ret;
    }
    if ((ret = av_write_frame(chain->mpegts_ctx, pkt)) < 0)
        return ret;
    size = avio_close_dyn_buf(chain->mpegts_ctx->pb, &buf);
    chain->mpegts_ctx->pb = NULL;
    if (size == 0) {
        av_free(buf);
        return 0;
    }
    av_init_packet(&local_pkt);
    local_pkt.data         = buf;
    local_pkt.size         = size;
    local_pkt.stream_index = 0;
    if (pkt->pts != AV_NOPTS_VALUE)
        local_pkt.pts = av_rescale_q(pkt->pts,
                                     s->streams[pkt->stream_index]->time_base,
                                     chain->rtp_ctx->streams[0]->time_base);
    if (pkt->dts != AV_NOPTS_VALUE)
        local_pkt.dts = av_rescale_q(pkt->dts,
                                     s->streams[pkt->stream_index]->time_base,
                                     chain->rtp_ctx->streams[0]->time_base);
    ret = av_write_frame(chain->rtp_ctx, &local_pkt);
    av_free(buf);

    return ret;
}

AVOutputFormat ff_rtp_mpegts_muxer = {
    .name              = "rtp_mpegts",
    .long_name         = NULL_IF_CONFIG_SMALL("RTP/mpegts output format"),
    .priv_data_size    = sizeof(struct MuxChain),
    .audio_codec       = AV_CODEC_ID_AAC,
    .video_codec       = AV_CODEC_ID_MPEG4,
    .write_header      = rtp_mpegts_write_header,
    .write_packet      = rtp_mpegts_write_packet,
    .write_trailer     = rtp_mpegts_write_close,
};