[FFmpeg-devel] [PATCH] Megalux Frame muxer and demuxer

Peter Ross pross at xvid.org
Sun Dec 30 10:18:11 CET 2012


Signed-off-by: Peter Ross <pross at xvid.org>
---
This is a bit of a toy. Gathering dust in my tree.

Samples: /incoming/megalux-frame/

 Changelog                |  1 +
 doc/general.texi         |  2 +
 libavformat/Makefile     |  2 +
 libavformat/allformats.c |  1 +
 libavformat/frm.c        | 35 ++++++++++++++++++
 libavformat/frm.h        | 34 +++++++++++++++++
 libavformat/frmdec.c     | 96 ++++++++++++++++++++++++++++++++++++++++++++++++
 libavformat/frmenc.c     | 64 ++++++++++++++++++++++++++++++++
 8 files changed, 235 insertions(+)
 create mode 100644 libavformat/frm.c
 create mode 100644 libavformat/frm.h
 create mode 100644 libavformat/frmdec.c
 create mode 100644 libavformat/frmenc.c

diff --git a/Changelog b/Changelog
index 9eec45c..e809f26 100644
--- a/Changelog
+++ b/Changelog
@@ -337,6 +337,7 @@ easier to use. The changes are:
 - Simple segmenting muxer
 - Indeo 4 decoder
 - SMJPEG demuxer
+- Megalux Frame muxer and demuxer
 
 
 version 0.8:
diff --git a/doc/general.texi b/doc/general.texi
index 5dc1954..de3c5e9 100644
--- a/doc/general.texi
+++ b/doc/general.texi
@@ -253,6 +253,8 @@ library:
     @tab Used in Sim City 3000; file extension .xa.
 @item MD Studio                 @tab   @tab X
 @item Metal Gear Solid: The Twin Snakes @tab @tab X
+ at item Megalux Frame             @tab X @tab X
+    @tab Used by Megalux Ultimate Paint
 @item Mobotix .mxg              @tab   @tab X
 @item Monkey's Audio            @tab   @tab X
 @item Motion Pixels MVI         @tab   @tab X
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 13fbe7c..28ca9d3 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -135,6 +135,8 @@ OBJS-$(CONFIG_FLV_MUXER)                 += flvenc.o avc.o
 OBJS-$(CONFIG_FOURXM_DEMUXER)            += 4xm.o
 OBJS-$(CONFIG_FRAMECRC_MUXER)            += framecrcenc.o framehash.o
 OBJS-$(CONFIG_FRAMEMD5_MUXER)            += md5enc.o framehash.o
+OBJS-$(CONFIG_FRM_DEMUXER)               += frm.o frmdec.o
+OBJS-$(CONFIG_FRM_MUXER)                 += frm.o frmenc.o
 OBJS-$(CONFIG_GIF_MUXER)                 += gif.o
 OBJS-$(CONFIG_GIF_DEMUXER)               += gifdec.o
 OBJS-$(CONFIG_GSM_DEMUXER)               += gsmdec.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index 739f5a1..2ecab5d 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -123,6 +123,7 @@ void av_register_all(void)
     REGISTER_DEMUXER (FOURXM,           fourxm);
     REGISTER_MUXER   (FRAMECRC,         framecrc);
     REGISTER_MUXER   (FRAMEMD5,         framemd5);
+    REGISTER_MUXDEMUX(FRM,              frm);
     REGISTER_MUXDEMUX(G722,             g722);
     REGISTER_MUXDEMUX(G723_1,           g723_1);
     REGISTER_DEMUXER (G729,             g729);
diff --git a/libavformat/frm.c b/libavformat/frm.c
new file mode 100644
index 0000000..0ca6257
--- /dev/null
+++ b/libavformat/frm.c
@@ -0,0 +1,35 @@
+/*
+ * Megalux Frame common code
+ * Copyright (c) 2010 Peter Ross <pross at 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 common code
+ */
+
+#include "frm.h"
+
+const AVCodecTag ff_frm_pix_fmt_tags[] = {
+    { PIX_FMT_RGB555, 1 },
+    { PIX_FMT_BGR32,  2 },
+    { PIX_FMT_RGB24,  3 },
+    { PIX_FMT_BGRA,   4 },
+    { PIX_FMT_BGRA,   5 },
+};
diff --git a/libavformat/frm.h b/libavformat/frm.h
new file mode 100644
index 0000000..f52a983
--- /dev/null
+++ b/libavformat/frm.h
@@ -0,0 +1,34 @@
+/*
+ * Megalux Frame common code
+ * Copyright (c) 2010 Peter Ross <pross at 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 common code
+ */
+
+#ifndef AVFORMAT_FRM_H
+#define AVFORMAT_FRM_H
+
+#include "internal.h"
+
+extern const AVCodecTag ff_frm_pix_fmt_tags[];
+
+#endif /* AVFORMAT_FRM_H */
diff --git a/libavformat/frmdec.c b/libavformat/frmdec.c
new file mode 100644
index 0000000..0c4d260
--- /dev/null
+++ b/libavformat/frmdec.c
@@ -0,0 +1,96 @@
+/*
+ * Megalux Frame demuxer
+ * Copyright (c) 2010 Peter Ross <pross at 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"
+#include "frm.h"
+
+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;
+    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(ff_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,
+};
diff --git a/libavformat/frmenc.c b/libavformat/frmenc.c
new file mode 100644
index 0000000..84bcb4f
--- /dev/null
+++ b/libavformat/frmenc.c
@@ -0,0 +1,64 @@
+/*
+ * Megalux Frame muxer
+ * Copyright (c) 2010 Peter Ross <pross at 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 muxer
+ */
+
+#include "libavutil/intreadwrite.h"
+#include "avformat.h"
+#include "riff.h"
+#include "frm.h"
+
+static int write_header(AVFormatContext *s)
+{
+    AVCodecContext *stc = s->streams[0]->codec;
+    int tag;
+
+    tag = ff_codec_get_tag(ff_frm_pix_fmt_tags, stc->pix_fmt);
+    if (!tag) {
+        av_log(s, AV_LOG_ERROR, "unsupported pix_fmt\n");
+        return AVERROR_INVALIDDATA;
+    }
+    avio_write(s->pb, "FRM", 3);
+    avio_w8(s->pb, tag);
+    avio_wl16(s->pb, stc->width);
+    avio_wl16(s->pb, stc->height);
+    return 0;
+}
+
+static int write_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    avio_write(s->pb, pkt->data, pkt->size);
+    return 0;
+}
+
+AVOutputFormat ff_frm_muxer = {
+    .name         = "frm",
+    .long_name    = NULL_IF_CONFIG_SMALL("Megalux Frame"),
+    .extensions   = "frm",
+    .audio_codec  = CODEC_ID_NONE,
+    .video_codec  = CODEC_ID_RAWVIDEO,
+    .write_header = write_header,
+    .write_packet = write_packet,
+    .flags        = AVFMT_NOTIMESTAMPS,
+};
-- 
1.8.0

-- Peter
(A907 E02F A6E5 0CD2 34CD 20D2 6760 79C5 AC40 DD6B)
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