[FFmpeg-cvslog] dshow: support choosing between devices with same name

[Ramiro Polla]

ffmpeg | branch: master | Ramiro Polla <ramiro.polla at gmail.com> | Fri Sep 30 17:49:09 2011 -0300| [2f9b955918f8efd9915dbd51bfe8be657cb337e3] | committer: Michael Niedermayer

dshow: support choosing between devices with same name

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=2f9b955918f8efd9915dbd51bfe8be657cb337e3
---

 doc/indevs.texi     |   14 ++++++++++++++
 libavdevice/dshow.c |    7 +++++++
 2 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/doc/indevs.texi b/doc/indevs.texi
index 3aa8f2f..90ae29c 100644
--- a/doc/indevs.texi
+++ b/doc/indevs.texi
@@ -104,6 +104,14 @@ If set to @option{true}, print a list of devices and exit.
 If set to @option{true}, print a list of selected device's options
 and exit.
 
+ at item video_device_number
+Set video device number for devices with same name (starts at 0,
+defaults to 0).
+
+ at item audio_device_number
+Set audio device number for devices with same name (starts at 0,
+defaults to 0).
+
 @end table
 
 @subsection Examples
@@ -123,6 +131,12 @@ $ ffmpeg -f dshow -i video="Camera"
 @end example
 
 @item
+Open second video device with name @var{Camera}:
+ at example
+$ ffmpeg -f dshow -video_device_number 1 -i video="Camera"
+ at end example
+
+ at item
 Open video device @var{Camera} and audio device @var{Microphone}:
 @example
 $ ffmpeg -f dshow -i video="Camera":audio="Microphone"
diff --git a/libavdevice/dshow.c b/libavdevice/dshow.c
index ab5f7e9..a5263df 100644
--- a/libavdevice/dshow.c
+++ b/libavdevice/dshow.c
@@ -31,6 +31,8 @@ struct dshow_ctx {
     IGraphBuilder *graph;
 
     char *device_name[2];
+    int video_device_number;
+    int audio_device_number;
 
     int   list_options;
     int   list_devices;
@@ -249,6 +251,8 @@ dshow_cycle_devices(AVFormatContext *avctx, ICreateDevEnum *devenum,
     IEnumMoniker *classenum = NULL;
     IMoniker *m = NULL;
     const char *device_name = ctx->device_name[devtype];
+    int skip = (devtype == VideoDevice) ? ctx->video_device_number
+                                        : ctx->audio_device_number;
     int r;
 
     const GUID *device_guid[2] = { &CLSID_VideoInputDeviceCategory,
@@ -283,6 +287,7 @@ dshow_cycle_devices(AVFormatContext *avctx, ICreateDevEnum *devenum,
             if (strcmp(device_name, buf))
                 goto fail1;
 
+            if (!skip--)
             IMoniker_BindToObject(m, 0, 0, &IID_IBaseFilter, (void *) &device_filter);
         } else {
             av_log(avctx, AV_LOG_INFO, " \"%s\"\n", buf);
@@ -938,6 +943,8 @@ static const AVOption options[] = {
     { "list_options", "list available options for specified device", OFFSET(list_options), AV_OPT_TYPE_INT, {.dbl=0}, 0, 1, DEC, "list_options" },
     { "true", "", 0, AV_OPT_TYPE_CONST, {.dbl=1}, 0, 0, DEC, "list_options" },
     { "false", "", 0, AV_OPT_TYPE_CONST, {.dbl=0}, 0, 0, DEC, "list_options" },
+    { "video_device_number", "set video device number for devices with same name (starts at 0)", OFFSET(video_device_number), AV_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, DEC },
+    { "audio_device_number", "set audio device number for devices with same name (starts at 0)", OFFSET(audio_device_number), AV_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, DEC },
     { NULL },
 };