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/*
* SMJPEG muxer
* Copyright (c) 2012 Paul B Mahol
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* 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.
*
* Libav is distributed in the hope that it will be useful,
* 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
* License along with Libav; if not, write to the Free Software
* 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);
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];
AVCodecParameters *par = st->codecpar;
if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
tag = ff_codec_get_tag(ff_codec_smjpeg_audio_tags, par->codec_id);
if (!tag) {
av_log(s, AV_LOG_ERROR, "unsupported audio codec\n");
return AVERROR(EINVAL);
}
avio_wl32(pb, SMJPEG_SND);
avio_wb32(pb, 8);
avio_wb16(pb, par->sample_rate);
avio_w8(pb, av_get_bits_per_sample(par->codec_id));
avio_w8(pb, par->channels);
avio_wl32(pb, tag);
avpriv_set_pts_info(st, 32, 1, 1000);
} else if (par->codec_type == AVMEDIA_TYPE_VIDEO) {
tag = ff_codec_get_tag(ff_codec_smjpeg_video_tags, par->codec_id);
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);
avio_wb16(pb, par->width);
avio_wb16(pb, par->height);
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];
AVCodecParameters *par = st->codecpar;
if (par->codec_type == AVMEDIA_TYPE_AUDIO)
avio_wl32(pb, SMJPEG_SNDD);
else if (par->codec_type == AVMEDIA_TYPE_VIDEO)
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;
if (pb->seekable) {
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),
.audio_codec = AV_CODEC_ID_PCM_S16LE,
.video_codec = AV_CODEC_ID_MJPEG,
.write_header = smjpeg_write_header,
.write_packet = smjpeg_write_packet,
.write_trailer = smjpeg_write_trailer,
.flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT,
.codec_tag = (const AVCodecTag *const []){ ff_codec_smjpeg_video_tags, ff_codec_smjpeg_audio_tags, 0 },
};
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