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2ba45a60 DM |
1 | /* |
2 | * Megalux Frame demuxer | |
3 | * Copyright (c) 2010 Peter Ross <pross@xvid.org> | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
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. | |
11 | * | |
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. | |
16 | * | |
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 | |
20 | */ | |
21 | ||
22 | /** | |
23 | * @file | |
24 | * Megalux Frame demuxer | |
25 | */ | |
26 | ||
27 | #include "libavcodec/raw.h" | |
28 | #include "libavutil/intreadwrite.h" | |
29 | #include "avformat.h" | |
30 | ||
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 }, | |
38 | }; | |
39 | ||
40 | typedef struct { | |
41 | int count; | |
42 | } FrmContext; | |
43 | ||
44 | static int frm_read_probe(AVProbeData *p) | |
45 | { | |
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; | |
50 | return 0; | |
51 | } | |
52 | ||
53 | static int frm_read_header(AVFormatContext *avctx) | |
54 | { | |
55 | AVIOContext *pb = avctx->pb; | |
56 | AVStream *st = avformat_new_stream(avctx, 0); | |
57 | if (!st) | |
58 | return AVERROR(ENOMEM); | |
59 | ||
60 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
61 | st->codec->codec_id = AV_CODEC_ID_RAWVIDEO; | |
62 | avio_skip(pb, 3); | |
63 | ||
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; | |
67 | ||
68 | st->codec->codec_tag = 0; | |
69 | st->codec->width = avio_rl16(pb); | |
70 | st->codec->height = avio_rl16(pb); | |
71 | return 0; | |
72 | } | |
73 | ||
74 | static int frm_read_packet(AVFormatContext *avctx, AVPacket *pkt) | |
75 | { | |
76 | FrmContext *s = avctx->priv_data; | |
77 | AVCodecContext *stc = avctx->streams[0]->codec; | |
78 | int packet_size, ret; | |
79 | ||
80 | if (s->count) | |
81 | return AVERROR_EOF; | |
82 | ||
83 | packet_size = avpicture_get_size(stc->pix_fmt, stc->width, stc->height); | |
84 | if (packet_size < 0) | |
85 | return AVERROR_INVALIDDATA; | |
86 | ||
87 | ret = av_get_packet(avctx->pb, pkt, packet_size); | |
88 | if (ret < 0) | |
89 | return ret; | |
90 | ||
91 | if (stc->pix_fmt == AV_PIX_FMT_BGRA) { | |
92 | int i; | |
93 | for (i = 3; i + 1 <= pkt->size; i += 4) | |
94 | pkt->data[i] = 0xFF - pkt->data[i]; | |
95 | } | |
96 | ||
97 | pkt->stream_index = 0; | |
98 | s->count++; | |
99 | ||
100 | return 0; | |
101 | } | |
102 | ||
103 | AVInputFormat ff_frm_demuxer = { | |
104 | .name = "frm", | |
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, | |
110 | }; |