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/intreadwrite.h"
31 static const PixelFormatTag frm_pix_fmt_tags
[] = {
32 { AV_PIX_FMT_RGB555
, 1 },
33 { AV_PIX_FMT_RGB0
, 2 },
34 { AV_PIX_FMT_RGB24
, 3 },
35 { AV_PIX_FMT_BGR0
, 4 },
36 { AV_PIX_FMT_BGRA
, 5 },
37 { AV_PIX_FMT_NONE
, 0 },
44 static int frm_read_probe(AVProbeData
*p
)
46 if (p
->buf_size
> 8 &&
47 p
->buf
[0] == 'F' && p
->buf
[1] == 'R' && p
->buf
[2] == 'M' &&
48 AV_RL16(&p
->buf
[4]) && AV_RL16(&p
->buf
[6]))
49 return AVPROBE_SCORE_MAX
/ 4;
53 static int frm_read_header(AVFormatContext
*avctx
)
55 AVIOContext
*pb
= avctx
->pb
;
56 AVStream
*st
= avformat_new_stream(avctx
, 0);
58 return AVERROR(ENOMEM
);
60 st
->codec
->codec_type
= AVMEDIA_TYPE_VIDEO
;
61 st
->codec
->codec_id
= AV_CODEC_ID_RAWVIDEO
;
64 st
->codec
->pix_fmt
= avpriv_find_pix_fmt(frm_pix_fmt_tags
, avio_r8(pb
));
65 if (!st
->codec
->pix_fmt
)
66 return AVERROR_INVALIDDATA
;
68 st
->codec
->codec_tag
= 0;
69 st
->codec
->width
= avio_rl16(pb
);
70 st
->codec
->height
= avio_rl16(pb
);
74 static int frm_read_packet(AVFormatContext
*avctx
, AVPacket
*pkt
)
76 FrmContext
*s
= avctx
->priv_data
;
77 AVCodecContext
*stc
= avctx
->streams
[0]->codec
;
83 packet_size
= avpicture_get_size(stc
->pix_fmt
, stc
->width
, stc
->height
);
85 return AVERROR_INVALIDDATA
;
87 ret
= av_get_packet(avctx
->pb
, pkt
, packet_size
);
91 if (stc
->pix_fmt
== AV_PIX_FMT_BGRA
) {
93 for (i
= 3; i
+ 1 <= pkt
->size
; i
+= 4)
94 pkt
->data
[i
] = 0xFF - pkt
->data
[i
];
97 pkt
->stream_index
= 0;
103 AVInputFormat ff_frm_demuxer
= {
105 .priv_data_size
= sizeof(FrmContext
),
106 .long_name
= NULL_IF_CONFIG_SMALL("Megalux Frame"),
107 .read_probe
= frm_read_probe
,
108 .read_header
= frm_read_header
,
109 .read_packet
= frm_read_packet
,