mirror of
https://github.com/pineappleEA/pineapple-src.git
synced 2024-12-05 00:58:25 -05:00
193 lines
6.2 KiB
C
Executable File
193 lines
6.2 KiB
C
Executable File
/*
|
|
* SMJPEG demuxer
|
|
* Copyright (c) 2011 Paul B Mahol
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg 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.
|
|
*
|
|
* FFmpeg 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 FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* This is a demuxer for Loki SDL Motion JPEG files
|
|
*/
|
|
|
|
#include <inttypes.h>
|
|
|
|
#include "avformat.h"
|
|
#include "internal.h"
|
|
#include "riff.h"
|
|
#include "smjpeg.h"
|
|
|
|
typedef struct SMJPEGContext {
|
|
int audio_stream_index;
|
|
int video_stream_index;
|
|
} SMJPEGContext;
|
|
|
|
static int smjpeg_probe(const AVProbeData *p)
|
|
{
|
|
if (!memcmp(p->buf, SMJPEG_MAGIC, 8))
|
|
return AVPROBE_SCORE_MAX;
|
|
return 0;
|
|
}
|
|
|
|
static int smjpeg_read_header(AVFormatContext *s)
|
|
{
|
|
SMJPEGContext *sc = s->priv_data;
|
|
AVStream *ast = NULL, *vst = NULL;
|
|
AVIOContext *pb = s->pb;
|
|
uint32_t version, htype, hlength, duration;
|
|
char *comment;
|
|
|
|
sc->audio_stream_index =
|
|
sc->video_stream_index = -1;
|
|
|
|
avio_skip(pb, 8); // magic
|
|
version = avio_rb32(pb);
|
|
if (version)
|
|
avpriv_request_sample(s, "Unknown version %"PRIu32, version);
|
|
|
|
duration = avio_rb32(pb); // in msec
|
|
|
|
while (!avio_feof(pb)) {
|
|
htype = avio_rl32(pb);
|
|
switch (htype) {
|
|
case SMJPEG_TXT:
|
|
hlength = avio_rb32(pb);
|
|
if (!hlength || hlength > 512)
|
|
return AVERROR_INVALIDDATA;
|
|
comment = av_malloc(hlength + 1);
|
|
if (!comment)
|
|
return AVERROR(ENOMEM);
|
|
if (avio_read(pb, comment, hlength) != hlength) {
|
|
av_freep(&comment);
|
|
av_log(s, AV_LOG_ERROR, "error when reading comment\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
comment[hlength] = 0;
|
|
av_dict_set(&s->metadata, "comment", comment,
|
|
AV_DICT_DONT_STRDUP_VAL);
|
|
break;
|
|
case SMJPEG_SND:
|
|
if (ast) {
|
|
avpriv_request_sample(s, "Multiple audio streams");
|
|
return AVERROR_PATCHWELCOME;
|
|
}
|
|
hlength = avio_rb32(pb);
|
|
if (hlength < 8)
|
|
return AVERROR_INVALIDDATA;
|
|
ast = avformat_new_stream(s, 0);
|
|
if (!ast)
|
|
return AVERROR(ENOMEM);
|
|
ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
ast->codecpar->sample_rate = avio_rb16(pb);
|
|
ast->codecpar->bits_per_coded_sample = avio_r8(pb);
|
|
ast->codecpar->channels = avio_r8(pb);
|
|
ast->codecpar->codec_tag = avio_rl32(pb);
|
|
ast->codecpar->codec_id = ff_codec_get_id(ff_codec_smjpeg_audio_tags,
|
|
ast->codecpar->codec_tag);
|
|
ast->duration = duration;
|
|
sc->audio_stream_index = ast->index;
|
|
avpriv_set_pts_info(ast, 32, 1, 1000);
|
|
avio_skip(pb, hlength - 8);
|
|
break;
|
|
case SMJPEG_VID:
|
|
if (vst) {
|
|
avpriv_request_sample(s, "Multiple video streams");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
hlength = avio_rb32(pb);
|
|
if (hlength < 12)
|
|
return AVERROR_INVALIDDATA;
|
|
vst = avformat_new_stream(s, 0);
|
|
if (!vst)
|
|
return AVERROR(ENOMEM);
|
|
vst->nb_frames = avio_rb32(pb);
|
|
vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
|
|
vst->codecpar->width = avio_rb16(pb);
|
|
vst->codecpar->height = avio_rb16(pb);
|
|
vst->codecpar->codec_tag = avio_rl32(pb);
|
|
vst->codecpar->codec_id = ff_codec_get_id(ff_codec_smjpeg_video_tags,
|
|
vst->codecpar->codec_tag);
|
|
vst->duration = duration;
|
|
sc->video_stream_index = vst->index;
|
|
avpriv_set_pts_info(vst, 32, 1, 1000);
|
|
avio_skip(pb, hlength - 12);
|
|
break;
|
|
case SMJPEG_HEND:
|
|
return 0;
|
|
default:
|
|
av_log(s, AV_LOG_ERROR, "unknown header %"PRIx32"\n", htype);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
}
|
|
|
|
return AVERROR_EOF;
|
|
}
|
|
|
|
static int smjpeg_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
SMJPEGContext *sc = s->priv_data;
|
|
uint32_t dtype, size, timestamp;
|
|
int64_t pos;
|
|
int ret;
|
|
|
|
if (avio_feof(s->pb))
|
|
return AVERROR_EOF;
|
|
pos = avio_tell(s->pb);
|
|
dtype = avio_rl32(s->pb);
|
|
switch (dtype) {
|
|
case SMJPEG_SNDD:
|
|
if (sc->audio_stream_index < 0)
|
|
return AVERROR_INVALIDDATA;
|
|
timestamp = avio_rb32(s->pb);
|
|
size = avio_rb32(s->pb);
|
|
ret = av_get_packet(s->pb, pkt, size);
|
|
pkt->stream_index = sc->audio_stream_index;
|
|
pkt->pts = timestamp;
|
|
pkt->pos = pos;
|
|
break;
|
|
case SMJPEG_VIDD:
|
|
if (sc->video_stream_index < 0)
|
|
return AVERROR_INVALIDDATA;
|
|
timestamp = avio_rb32(s->pb);
|
|
size = avio_rb32(s->pb);
|
|
ret = av_get_packet(s->pb, pkt, size);
|
|
pkt->stream_index = sc->video_stream_index;
|
|
pkt->pts = timestamp;
|
|
pkt->pos = pos;
|
|
break;
|
|
case SMJPEG_DONE:
|
|
ret = AVERROR_EOF;
|
|
break;
|
|
default:
|
|
av_log(s, AV_LOG_ERROR, "unknown chunk %"PRIx32"\n", dtype);
|
|
ret = AVERROR_INVALIDDATA;
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
AVInputFormat ff_smjpeg_demuxer = {
|
|
.name = "smjpeg",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Loki SDL MJPEG"),
|
|
.priv_data_size = sizeof(SMJPEGContext),
|
|
.read_probe = smjpeg_probe,
|
|
.read_header = smjpeg_read_header,
|
|
.read_packet = smjpeg_read_packet,
|
|
.extensions = "mjpg",
|
|
.flags = AVFMT_GENERIC_INDEX,
|
|
};
|