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