Adobe Filmstrip muxer and demuxer

Originally committed as revision 21212 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 85 insertions, 0 deletions

diff --git a/libavformat/filmstripenc.c b/libavformat/filmstripenc.c
new file mode 100644
index 0000000000..9d76846ceb
--- /dev/null
+++ b/libavformat/filmstripenc.c
@@ -0,0 +1,85 @@
+/*
+ * Adobe Filmstrip muxer
+ * Copyright (c) 2010 Peter Ross
+ *
+ * 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 libavformat/filmstripenc.c
+ * Adobe Filmstrip muxer
+ */
+
+#include "libavutil/intreadwrite.h"
+#include "avformat.h"
+
+#define RAND_TAG MKBETAG('R','a','n','d')
+
+typedef struct {
+    int nb_frames;
+} FilmstripMuxContext;
+
+static int write_header(AVFormatContext *s)
+{
+    if (s->streams[0]->codec->pix_fmt != PIX_FMT_RGBA) {
+        av_log(s, AV_LOG_ERROR, "only PIX_FMT_RGBA is supported\n");
+        return AVERROR_INVALIDDATA;
+    }
+    return 0;
+}
+
+static int write_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    FilmstripMuxContext *film = s->priv_data;
+    put_buffer(s->pb, pkt->data, pkt->size);
+    film->nb_frames++;
+    return 0;
+}
+
+static int write_trailer(AVFormatContext *s)
+{
+    FilmstripMuxContext *film = s->priv_data;
+    ByteIOContext *pb = s->pb;
+    AVStream *st = s->streams[0];
+    int i;
+
+    put_be32(pb, RAND_TAG);
+    put_be32(pb, film->nb_frames);
+    put_be16(pb, 0);  // packing method
+    put_be16(pb, 0);  // reserved
+    put_be16(pb, st->codec->width);
+    put_be16(pb, st->codec->height);
+    put_be16(pb, 0);  // leading
+    put_be16(pb, 1/av_q2d(st->codec->time_base));
+    for (i = 0; i < 16; i++)
+        put_byte(pb, 0x00);  // reserved
+    put_flush_packet(pb);
+    return 0;
+}
+
+AVOutputFormat filmstrip_muxer = {
+    "filmstrip",
+    NULL_IF_CONFIG_SMALL("Adobe Filmstrip"),
+    NULL,
+    "flm",
+    sizeof(FilmstripMuxContext),
+    CODEC_ID_NONE,
+    CODEC_ID_RAWVIDEO,
+    write_header,
+    write_packet,
+    write_trailer,
+};