/* * 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 "libavcodec/raw.h" #include "libavutil/imgutils.h" #include "libavutil/intreadwrite.h" #include "avformat.h" static const PixelFormatTag frm_pix_fmt_tags[] = { { AV_PIX_FMT_RGB555, 1 }, { AV_PIX_FMT_RGB0, 2 }, { AV_PIX_FMT_RGB24, 3 }, { AV_PIX_FMT_BGR0, 4 }, { AV_PIX_FMT_BGRA, 5 }, { AV_PIX_FMT_NONE, 0 }, }; typedef struct { int count; } FrmContext; static int frm_read_probe(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); if (!st) return AVERROR(ENOMEM); st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO; avio_skip(pb, 3); st->codecpar->format = avpriv_find_pix_fmt(frm_pix_fmt_tags, avio_r8(pb)); if (!st->codecpar->format) return AVERROR_INVALIDDATA; 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; } AVInputFormat ff_frm_demuxer = { .name = "frm", .priv_data_size = sizeof(FrmContext), .long_name = NULL_IF_CONFIG_SMALL("Megalux Frame"), .read_probe = frm_read_probe, .read_header = frm_read_header, .read_packet = frm_read_packet, };