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110 lines
3.0 KiB
110 lines
3.0 KiB
/* |
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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/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 = avpicture_get_size(stc->pix_fmt, stc->width, stc->height); |
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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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