dv1394 channel selection by Max Krasnyansky - modified channel number to be in base 10 by default

Originally committed as revision 1500 to svn://svn.ffmpeg.org/ffmpeg/trunk

ffmpeg.c

@@ -160,6 +160,7 @@ static int video_stream_copy = 0;
 
 static char *video_grab_format = "video4linux";
 static char *video_device = NULL;
+static int  video_channel = 0;
 
 static char *audio_grab_format = "audio_device";
 static char *audio_device = NULL;
@@ -1872,6 +1873,11 @@ void opt_video_device(const char *arg)
     video_device = strdup(arg);
 }
 
+void opt_video_channel(const char *arg)
+{
+    video_channel = strtol(arg, NULL, 0);
+}
+
 void opt_audio_device(const char *arg)
 {
     audio_device = strdup(arg);
@@ -2463,8 +2469,8 @@ void prepare_grab(void)
     if (has_video) {
         AVInputFormat *fmt1;
         fmt1 = av_find_input_format(video_grab_format);
-        vp->device = video_device;
-        /* XXX: set DV video channel ? */
+        vp->device  = video_device;
+        vp->channel = video_channel;
         if (av_open_input_file(&ic, "", fmt1, 0, vp) < 0) {
             fprintf(stderr, "Could not find video grab device\n");
             exit(1);
@@ -2723,6 +2729,7 @@ const OptionDef options[] = {
     { "minrate", HAS_ARG, {(void*)opt_video_bitrate_min}, "set min video bitrate tolerance (in kbit/s)", "bitrate" },
     { "bufsize", HAS_ARG, {(void*)opt_video_buffer_size}, "set ratecontrol buffere size (in kbit)", "size" },
     { "vd", HAS_ARG | OPT_EXPERT, {(void*)opt_video_device}, "set video grab device", "device" },
+    { "vc", HAS_ARG | OPT_EXPERT, {(void*)opt_video_channel}, "set video grab channel (DV1394 only)", "channel" },
     { "dv1394", OPT_EXPERT, {(void*)opt_dv1394}, "set DV1394 grab", "" },
     { "vcodec", HAS_ARG | OPT_EXPERT, {(void*)opt_video_codec}, "force video codec ('copy' to copy stream)", "codec" },
     { "me", HAS_ARG | OPT_EXPERT, {(void*)opt_motion_estimation}, "set motion estimation method", 

libavformat/dv1394.c

@@ -84,7 +84,11 @@ static int dv1394_read_header(AVFormatContext * context, AVFormatParameters * ap
 
     dv->width   = DV1394_WIDTH;
     dv->height  = DV1394_HEIGHT;
-    dv->channel = ap->channel;
+
+    if (ap->channel)
+        dv->channel = ap->channel;
+    else
+        dv->channel = DV1394_DEFAULT_CHANNEL;
 
     dv->frame_rate = 30;