2 * Megalux Frame demuxer
3 * Copyright (c) 2010 Peter Ross <pross@xvid.org>
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * 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,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 * Megalux Frame demuxer
27 #include "libavcodec/raw.h"
28 #include "libavutil/imgutils.h"
29 #include "libavutil/intreadwrite.h"
32 static const PixelFormatTag frm_pix_fmt_tags[] = {
33 { AV_PIX_FMT_RGB555, 1 },
34 { AV_PIX_FMT_RGB0, 2 },
35 { AV_PIX_FMT_RGB24, 3 },
36 { AV_PIX_FMT_BGR0, 4 },
37 { AV_PIX_FMT_BGRA, 5 },
38 { AV_PIX_FMT_NONE, 0 },
45 static int frm_read_probe(AVProbeData *p)
47 if (p->buf_size > 8 &&
48 p->buf[0] == 'F' && p->buf[1] == 'R' && p->buf[2] == 'M' &&
49 AV_RL16(&p->buf[4]) && AV_RL16(&p->buf[6]))
50 return AVPROBE_SCORE_MAX / 4;
54 static int frm_read_header(AVFormatContext *avctx)
56 AVIOContext *pb = avctx->pb;
57 AVStream *st = avformat_new_stream(avctx, 0);
59 return AVERROR(ENOMEM);
61 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
62 st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
65 st->codecpar->format = avpriv_find_pix_fmt(frm_pix_fmt_tags, avio_r8(pb));
66 if (!st->codecpar->format)
67 return AVERROR_INVALIDDATA;
69 st->codecpar->codec_tag = 0;
70 st->codecpar->width = avio_rl16(pb);
71 st->codecpar->height = avio_rl16(pb);
75 static int frm_read_packet(AVFormatContext *avctx, AVPacket *pkt)
77 FrmContext *s = avctx->priv_data;
78 AVCodecParameters *par = avctx->streams[0]->codecpar;
84 packet_size = av_image_get_buffer_size(par->format, par->width, par->height, 1);
86 return AVERROR_INVALIDDATA;
88 ret = av_get_packet(avctx->pb, pkt, packet_size);
92 if (par->format == AV_PIX_FMT_BGRA) {
94 for (i = 3; i + 1 <= pkt->size; i += 4)
95 pkt->data[i] = 0xFF - pkt->data[i];
98 pkt->stream_index = 0;
104 AVInputFormat ff_frm_demuxer = {
106 .priv_data_size = sizeof(FrmContext),
107 .long_name = NULL_IF_CONFIG_SMALL("Megalux Frame"),
108 .read_probe = frm_read_probe,
109 .read_header = frm_read_header,
110 .read_packet = frm_read_packet,