smjpegenc.c 4.56 KB
Newer Older
Paul B Mahol's avatar
Paul B Mahol committed
1 2 3 4
/*
 * SMJPEG muxer
 * Copyright (c) 2012 Paul B Mahol
 *
5
 * This file is part of FFmpeg.
Paul B Mahol's avatar
Paul B Mahol committed
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
Paul B Mahol's avatar
Paul B Mahol committed
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,
Paul B Mahol's avatar
Paul B Mahol committed
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
Paul B Mahol's avatar
Paul B Mahol committed
19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * This is a muxer for Loki SDL Motion JPEG files
 */

#include "avformat.h"
#include "internal.h"
#include "smjpeg.h"

typedef struct SMJPEGMuxContext {
    uint32_t duration;
} SMJPEGMuxContext;

static int smjpeg_write_header(AVFormatContext *s)
{
    AVDictionaryEntry *t = NULL;
    AVIOContext *pb = s->pb;
    int n, tag;

    if (s->nb_streams > 2) {
        av_log(s, AV_LOG_ERROR, "more than >2 streams are not supported\n");
        return AVERROR(EINVAL);
    }
    avio_write(pb, SMJPEG_MAGIC, 8);
    avio_wb32(pb, 0);
    avio_wb32(pb, 0);

49
    ff_standardize_creation_time(s);
Paul B Mahol's avatar
Paul B Mahol committed
50 51 52 53 54 55 56 57 58 59
    while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
        avio_wl32(pb, SMJPEG_TXT);
        avio_wb32(pb, strlen(t->key) + strlen(t->value) + 3);
        avio_write(pb, t->key, strlen(t->key));
        avio_write(pb, " = ", 3);
        avio_write(pb, t->value, strlen(t->value));
    }

    for (n = 0; n < s->nb_streams; n++) {
        AVStream *st = s->streams[n];
60 61 62
        AVCodecParameters *par = st->codecpar;
        if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
            tag = ff_codec_get_tag(ff_codec_smjpeg_audio_tags, par->codec_id);
Paul B Mahol's avatar
Paul B Mahol committed
63 64 65 66 67 68
            if (!tag) {
                av_log(s, AV_LOG_ERROR, "unsupported audio codec\n");
                return AVERROR(EINVAL);
            }
            avio_wl32(pb, SMJPEG_SND);
            avio_wb32(pb, 8);
69
            avio_wb16(pb, par->sample_rate);
70
            avio_w8(pb, par->bits_per_coded_sample);
71
            avio_w8(pb, par->channels);
Paul B Mahol's avatar
Paul B Mahol committed
72 73
            avio_wl32(pb, tag);
            avpriv_set_pts_info(st, 32, 1, 1000);
74 75
        } else if (par->codec_type == AVMEDIA_TYPE_VIDEO) {
            tag = ff_codec_get_tag(ff_codec_smjpeg_video_tags, par->codec_id);
Paul B Mahol's avatar
Paul B Mahol committed
76 77 78 79 80 81 82
            if (!tag) {
                av_log(s, AV_LOG_ERROR, "unsupported video codec\n");
                return AVERROR(EINVAL);
            }
            avio_wl32(pb, SMJPEG_VID);
            avio_wb32(pb, 12);
            avio_wb32(pb, 0);
83 84
            avio_wb16(pb, par->width);
            avio_wb16(pb, par->height);
Paul B Mahol's avatar
Paul B Mahol committed
85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100
            avio_wl32(pb, tag);
            avpriv_set_pts_info(st, 32, 1, 1000);
        }
    }

    avio_wl32(pb, SMJPEG_HEND);
    avio_flush(pb);

    return 0;
}

static int smjpeg_write_packet(AVFormatContext *s, AVPacket *pkt)
{
    SMJPEGMuxContext *smc = s->priv_data;
    AVIOContext *pb = s->pb;
    AVStream *st = s->streams[pkt->stream_index];
101
    AVCodecParameters *par = st->codecpar;
Paul B Mahol's avatar
Paul B Mahol committed
102

103
    if (par->codec_type == AVMEDIA_TYPE_AUDIO)
Paul B Mahol's avatar
Paul B Mahol committed
104
        avio_wl32(pb, SMJPEG_SNDD);
105
    else if (par->codec_type == AVMEDIA_TYPE_VIDEO)
Paul B Mahol's avatar
Paul B Mahol committed
106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123
        avio_wl32(pb, SMJPEG_VIDD);
    else
        return 0;

    avio_wb32(pb, pkt->pts);
    avio_wb32(pb, pkt->size);
    avio_write(pb, pkt->data, pkt->size);

    smc->duration = FFMAX(smc->duration, pkt->pts + pkt->duration);
    return 0;
}

static int smjpeg_write_trailer(AVFormatContext *s)
{
    SMJPEGMuxContext *smc = s->priv_data;
    AVIOContext *pb = s->pb;
    int64_t currentpos;

124
    if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
Paul B Mahol's avatar
Paul B Mahol committed
125 126 127 128 129 130 131 132 133 134 135 136 137 138 139
        currentpos = avio_tell(pb);
        avio_seek(pb, 12, SEEK_SET);
        avio_wb32(pb, smc->duration);
        avio_seek(pb, currentpos, SEEK_SET);
    }

    avio_wl32(pb, SMJPEG_DONE);

    return 0;
}

AVOutputFormat ff_smjpeg_muxer = {
    .name           = "smjpeg",
    .long_name      = NULL_IF_CONFIG_SMALL("Loki SDL MJPEG"),
    .priv_data_size = sizeof(SMJPEGMuxContext),
140 141
    .audio_codec    = AV_CODEC_ID_PCM_S16LE,
    .video_codec    = AV_CODEC_ID_MJPEG,
Paul B Mahol's avatar
Paul B Mahol committed
142 143 144
    .write_header   = smjpeg_write_header,
    .write_packet   = smjpeg_write_packet,
    .write_trailer  = smjpeg_write_trailer,
145
    .flags          = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT,
Paul B Mahol's avatar
Paul B Mahol committed
146 147
    .codec_tag      = (const AVCodecTag *const []){ ff_codec_smjpeg_video_tags, ff_codec_smjpeg_audio_tags, 0 },
};