yading@11: /*
yading@11:  * Megalux Frame demuxer
yading@11:  * Copyright (c) 2010 Peter Ross <pross@xvid.org>
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: /**
yading@11:  * @file
yading@11:  * Megalux Frame demuxer
yading@11:  */
yading@11: 
yading@11: #include "libavcodec/raw.h"
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "avformat.h"
yading@11: 
yading@11: static const PixelFormatTag frm_pix_fmt_tags[] = {
yading@11:     { AV_PIX_FMT_RGB555, 1 },
yading@11:     { AV_PIX_FMT_RGB0,   2 },
yading@11:     { AV_PIX_FMT_RGB24,  3 },
yading@11:     { AV_PIX_FMT_BGR0,   4 },
yading@11:     { AV_PIX_FMT_BGRA,   5 },
yading@11:     { AV_PIX_FMT_NONE,   0 },
yading@11: };
yading@11: 
yading@11: typedef struct {
yading@11:     int count;
yading@11: } FrmContext;
yading@11: 
yading@11: static int frm_read_probe(AVProbeData *p)
yading@11: {
yading@11:     if (p->buf_size > 8 &&
yading@11:         p->buf[0] == 'F' && p->buf[1] == 'R' && p->buf[2] == 'M' &&
yading@11:         AV_RL16(&p->buf[4]) && AV_RL16(&p->buf[6]))
yading@11:         return AVPROBE_SCORE_MAX / 4;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int frm_read_header(AVFormatContext *avctx)
yading@11: {
yading@11:     AVIOContext *pb = avctx->pb;
yading@11:     AVStream *st = avformat_new_stream(avctx, 0);
yading@11:     if (!st)
yading@11:         return AVERROR(ENOMEM);
yading@11: 
yading@11:     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
yading@11:     st->codec->codec_id   = AV_CODEC_ID_RAWVIDEO;
yading@11:     avio_skip(pb, 3);
yading@11: 
yading@11:     st->codec->pix_fmt    = avpriv_find_pix_fmt(frm_pix_fmt_tags, avio_r8(pb));
yading@11:     if (!st->codec->pix_fmt)
yading@11:         return AVERROR_INVALIDDATA;
yading@11: 
yading@11:     st->codec->codec_tag  = 0;
yading@11:     st->codec->width      = avio_rl16(pb);
yading@11:     st->codec->height     = avio_rl16(pb);
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int frm_read_packet(AVFormatContext *avctx, AVPacket *pkt)
yading@11: {
yading@11:     FrmContext *s = avctx->priv_data;
yading@11:     AVCodecContext *stc = avctx->streams[0]->codec;
yading@11:     int packet_size, ret;
yading@11: 
yading@11:     if (s->count)
yading@11:         return AVERROR_EOF;
yading@11: 
yading@11:     packet_size = avpicture_get_size(stc->pix_fmt, stc->width, stc->height);
yading@11:     if (packet_size < 0)
yading@11:         return AVERROR_INVALIDDATA;
yading@11: 
yading@11:     ret = av_get_packet(avctx->pb, pkt, packet_size);
yading@11:     if (ret < 0)
yading@11:         return ret;
yading@11: 
yading@11:     if (stc->pix_fmt == AV_PIX_FMT_BGRA) {
yading@11:         int i;
yading@11:         for (i = 3; i + 1 <= pkt->size; i += 4)
yading@11:             pkt->data[i] = 0xFF - pkt->data[i];
yading@11:     }
yading@11: 
yading@11:     pkt->stream_index = 0;
yading@11:     s->count++;
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_frm_demuxer = {
yading@11:     .name           = "frm",
yading@11:     .priv_data_size = sizeof(FrmContext),
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("Megalux Frame"),
yading@11:     .read_probe     = frm_read_probe,
yading@11:     .read_header    = frm_read_header,
yading@11:     .read_packet    = frm_read_packet,
yading@11: };