repositories / deb_ffmpeg.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | }; |