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 31static 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 40typedef struct { 41 int count; 42} FrmContext; 43 44static 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 53static 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 74static 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 103AVInputFormat 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}; 111