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