added raw DV demux (audio is currently not handled)

Originally committed as revision 1015 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 135 insertions, 0 deletions

diff --git a/libav/dv.c b/libav/dv.c
new file mode 100644
index 0000000000..5a781b8dbe
--- /dev/null
+++ b/libav/dv.c
@@ -0,0 +1,135 @@
+/* 
+ * Raw DV format
+ * Copyright (c) 2002 Fabrice Bellard.
+ *
+ * This library 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 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include "avformat.h"
+
+#define NTSC_FRAME_SIZE 120000
+#define PAL_FRAME_SIZE  144000
+
+typedef struct DVDemuxContext {
+    int is_audio;
+} DVDemuxContext;
+
+/* raw input */
+static int dv_read_header(AVFormatContext *s,
+                          AVFormatParameters *ap)
+{
+    AVStream *vst, *ast;
+
+    vst = av_new_stream(s, 0);
+    if (!vst)
+        return AVERROR_NOMEM;
+    vst->codec.codec_type = CODEC_TYPE_VIDEO;
+    vst->codec.codec_id = CODEC_ID_DVVIDEO;
+
+#if 0
+    ast = av_new_stream(s, 1);
+    if (!ast)
+        return AVERROR_NOMEM;
+
+    ast->codec.codec_type = CODEC_TYPE_AUDIO;
+    ast->codec.codec_id = CODEC_ID_DVAUDIO;
+#endif
+    return 0;
+}
+
+/* XXX: build fake audio stream when DV audio decoder will be finished */
+int dv_read_packet(AVFormatContext *s,
+                   AVPacket *pkt)
+{
+    int ret, size, dsf;
+    uint8_t buf[4];
+    
+    ret = get_buffer(&s->pb, buf, 4);
+    if (ret <= 0) 
+        return -EIO;
+    dsf = buf[3] & 0x80;
+    if (!dsf)
+        size = NTSC_FRAME_SIZE;
+    else
+        size = PAL_FRAME_SIZE;
+    
+    if (av_new_packet(pkt, size) < 0)
+        return -EIO;
+
+    pkt->stream_index = 0;
+    memcpy(pkt->data, buf, 4);
+    ret = get_buffer(&s->pb, pkt->data + 4, size - 4);
+    if (ret <= 0) {
+        av_free_packet(pkt);
+        return -EIO;
+    }
+    return ret;
+}
+
+int dv_read_close(AVFormatContext *s)
+{
+    return 0;
+}
+
+AVInputFormat dv_iformat = {
+    "dv",
+    "DV video format",
+    sizeof(DVDemuxContext),
+    NULL,
+    dv_read_header,
+    dv_read_packet,
+    dv_read_close,
+    extensions: "dv",
+};
+
+#if 0
+int dv_write_header(struct AVFormatContext *s)
+{
+    return 0;
+}
+
+int dv_write_packet(struct AVFormatContext *s, 
+                     int stream_index,
+                     unsigned char *buf, int size, int force_pts)
+{
+    put_buffer(&s->pb, buf, size);
+    put_flush_packet(&s->pb);
+    return 0;
+}
+
+int dv_write_trailer(struct AVFormatContext *s)
+{
+    return 0;
+}
+
+AVOutputFormat dv_oformat = {
+    "dv",
+    "DV video format",
+    NULL,
+    "dv",
+    0,
+    CODEC_ID_DVVIDEO,
+    CODEC_ID_DVAUDIO,
+    dv_write_header,
+    dv_write_packet,
+    dv_write_trailer,
+};
+#endif
+
+int dv_init(void)
+{
+    av_register_input_format(&dv_iformat);
+    //    av_register_output_format(&dv_oformat);
+    return 0;
+}