mirror of
https://gitee.com/openharmony/third_party_ffmpeg
synced 2024-12-11 13:16:26 +00:00
112 lines
3.1 KiB
C
112 lines
3.1 KiB
C
/*
|
|
* Adobe Filmstrip demuxer
|
|
* Copyright (c) 2010 Peter Ross
|
|
*
|
|
* 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
|
|
* Adobe Filmstrip demuxer
|
|
*/
|
|
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "avformat.h"
|
|
|
|
#define RAND_TAG MKBETAG('R','a','n','d')
|
|
|
|
typedef struct {
|
|
int leading;
|
|
} FilmstripDemuxContext;
|
|
|
|
static int read_header(AVFormatContext *s,
|
|
AVFormatParameters *ap)
|
|
{
|
|
FilmstripDemuxContext *film = s->priv_data;
|
|
AVIOContext *pb = s->pb;
|
|
AVStream *st;
|
|
|
|
if (url_is_streamed(s->pb))
|
|
return AVERROR(EIO);
|
|
|
|
avio_seek(pb, url_fsize(pb) - 36, SEEK_SET);
|
|
if (avio_rb32(pb) != RAND_TAG) {
|
|
av_log(s, AV_LOG_ERROR, "magic number not found");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
st = av_new_stream(s, 0);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
|
|
st->nb_frames = avio_rb32(pb);
|
|
if (avio_rb16(pb) != 0) {
|
|
av_log_ask_for_sample(s, "unsupported packing method\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
avio_seek(pb, 2, SEEK_CUR);
|
|
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
|
|
st->codec->codec_id = CODEC_ID_RAWVIDEO;
|
|
st->codec->pix_fmt = PIX_FMT_RGBA;
|
|
st->codec->codec_tag = 0; /* no fourcc */
|
|
st->codec->width = avio_rb16(pb);
|
|
st->codec->height = avio_rb16(pb);
|
|
film->leading = avio_rb16(pb);
|
|
av_set_pts_info(st, 64, 1, avio_rb16(pb));
|
|
|
|
avio_seek(pb, 0, SEEK_SET);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int read_packet(AVFormatContext *s,
|
|
AVPacket *pkt)
|
|
{
|
|
FilmstripDemuxContext *film = s->priv_data;
|
|
AVStream *st = s->streams[0];
|
|
|
|
if (url_feof(s->pb))
|
|
return AVERROR(EIO);
|
|
pkt->dts = avio_tell(s->pb) / (st->codec->width * (st->codec->height + film->leading) * 4);
|
|
pkt->size = av_get_packet(s->pb, pkt, st->codec->width * st->codec->height * 4);
|
|
avio_seek(s->pb, st->codec->width * film->leading * 4, SEEK_CUR);
|
|
if (pkt->size < 0)
|
|
return pkt->size;
|
|
pkt->flags |= AV_PKT_FLAG_KEY;
|
|
return 0;
|
|
}
|
|
|
|
static int read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
|
|
{
|
|
AVStream *st = s->streams[stream_index];
|
|
avio_seek(s->pb, FFMAX(timestamp, 0) * st->codec->width * st->codec->height * 4, SEEK_SET);
|
|
return 0;
|
|
}
|
|
|
|
AVInputFormat ff_filmstrip_demuxer = {
|
|
"filmstrip",
|
|
NULL_IF_CONFIG_SMALL("Adobe Filmstrip"),
|
|
sizeof(FilmstripDemuxContext),
|
|
NULL,
|
|
read_header,
|
|
read_packet,
|
|
NULL,
|
|
read_seek,
|
|
.extensions = "flm",
|
|
};
|