mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-28 20:53:54 +02:00
6a3f345c1a
The fourccs used by the Megalux Frame format to determine the pixel format are actually no fourccs at all as they are a single byte. Furthermore, their range is continuous (1-5), so they are actually ordinary indices. So treat them as such and don't use PixelFormatTags for them. Reviewed-by: Paul B Mahol <onemda@gmail.com> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
114 lines
3.0 KiB
C
114 lines
3.0 KiB
C
/*
|
|
* Megalux Frame demuxer
|
|
* Copyright (c) 2010 Peter Ross <pross@xvid.org>
|
|
*
|
|
* 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
|
|
* Megalux Frame demuxer
|
|
*/
|
|
|
|
#include "libavcodec/raw.h"
|
|
#include "libavutil/imgutils.h"
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "avformat.h"
|
|
|
|
static const enum AVPixelFormat frm_pix_fmt_tags[] = {
|
|
AV_PIX_FMT_RGB555,
|
|
AV_PIX_FMT_RGB0,
|
|
AV_PIX_FMT_RGB24,
|
|
AV_PIX_FMT_BGR0,
|
|
AV_PIX_FMT_BGRA,
|
|
};
|
|
|
|
typedef struct {
|
|
int count;
|
|
} FrmContext;
|
|
|
|
static int frm_read_probe(const AVProbeData *p)
|
|
{
|
|
if (p->buf_size > 8 &&
|
|
p->buf[0] == 'F' && p->buf[1] == 'R' && p->buf[2] == 'M' &&
|
|
AV_RL16(&p->buf[4]) && AV_RL16(&p->buf[6]))
|
|
return AVPROBE_SCORE_MAX / 4;
|
|
return 0;
|
|
}
|
|
|
|
static int frm_read_header(AVFormatContext *avctx)
|
|
{
|
|
AVIOContext *pb = avctx->pb;
|
|
AVStream *st = avformat_new_stream(avctx, 0);
|
|
unsigned idx;
|
|
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
|
|
st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
|
|
st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
|
|
avio_skip(pb, 3);
|
|
|
|
idx = avio_r8(pb) - 1;
|
|
if (idx >= FF_ARRAY_ELEMS(frm_pix_fmt_tags))
|
|
return AVERROR_INVALIDDATA;
|
|
st->codecpar->format = frm_pix_fmt_tags[idx];
|
|
|
|
st->codecpar->codec_tag = 0;
|
|
st->codecpar->width = avio_rl16(pb);
|
|
st->codecpar->height = avio_rl16(pb);
|
|
return 0;
|
|
}
|
|
|
|
static int frm_read_packet(AVFormatContext *avctx, AVPacket *pkt)
|
|
{
|
|
FrmContext *s = avctx->priv_data;
|
|
AVCodecParameters *par = avctx->streams[0]->codecpar;
|
|
int packet_size, ret;
|
|
|
|
if (s->count)
|
|
return AVERROR_EOF;
|
|
|
|
packet_size = av_image_get_buffer_size(par->format, par->width, par->height, 1);
|
|
if (packet_size < 0)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
ret = av_get_packet(avctx->pb, pkt, packet_size);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (par->format == AV_PIX_FMT_BGRA) {
|
|
int i;
|
|
for (i = 3; i + 1 <= pkt->size; i += 4)
|
|
pkt->data[i] = 0xFF - pkt->data[i];
|
|
}
|
|
|
|
pkt->stream_index = 0;
|
|
s->count++;
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVInputFormat ff_frm_demuxer = {
|
|
.name = "frm",
|
|
.priv_data_size = sizeof(FrmContext),
|
|
.long_name = NULL_IF_CONFIG_SMALL("Megalux Frame"),
|
|
.read_probe = frm_read_probe,
|
|
.read_header = frm_read_header,
|
|
.read_packet = frm_read_packet,
|
|
};
|