Megalux Frame demuxer

1 files changed, 103 insertions, 0 deletions

diff --git a/libavformat/frmdec.c b/libavformat/frmdec.c
new file mode 100644
index 0000000000..b9b3ed73fc
--- /dev/null
+++ b/libavformat/frmdec.c
@@ -0,0 +1,103 @@
+/*
+ * 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/intreadwrite.h"
+#include "avformat.h"
+#include "riff.h"
+
+static const AVCodecTag frm_pix_fmt_tags[] = {
+    { PIX_FMT_RGB555, 1 },
+    { PIX_FMT_BGR32,  2 },
+    { PIX_FMT_RGB24,  3 },
+    { PIX_FMT_BGR0,   4 },
+    { PIX_FMT_BGR0,   5 },
+};
+
+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 / 2;
+    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->codec->codec_type = AVMEDIA_TYPE_VIDEO;
+    st->codec->codec_id   = AV_CODEC_ID_RAWVIDEO;
+    avio_skip(pb, 3);
+
+    st->codec->pix_fmt    = ff_codec_get_id(frm_pix_fmt_tags, avio_r8(pb));
+    if (!st->codec->pix_fmt)
+        return AVERROR_INVALIDDATA;
+
+    st->codec->codec_tag  = 0;
+    st->codec->width      = avio_rl16(pb);
+    st->codec->height     = avio_rl16(pb);
+    return 0;
+}
+
+static int frm_read_packet(AVFormatContext *avctx, AVPacket *pkt)
+{
+    FrmContext *s = avctx->priv_data;
+    AVCodecContext *stc = avctx->streams[0]->codec;
+    int packet_size, ret;
+
+    if (s->count)
+        return AVERROR_EOF;
+
+    packet_size = avpicture_get_size(stc->pix_fmt, stc->width, stc->height);
+    if (packet_size < 0)
+        return AVERROR_INVALIDDATA;
+
+    ret = av_get_packet(avctx->pb, pkt, packet_size);
+    if (ret < 0)
+        return ret;
+
+    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,
+};