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[FFmpeg-devel,v3,13/34] avdevice: adding control message requesting to show config dialog

Message ID 20210706092020.1057-14-dcnieho@gmail.com
State New
Headers show
Series avdevice (mostly dshow) enhancements
Related show


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Commit Message

Diederick C. Niehorster July 6, 2021, 9:19 a.m. UTC
This control message can be used to programmatically ask a device to
show one of its configuration dialogs.

Adding documentation of this message's int argument.

Bumping avdevice version.

Signed-off-by: Diederick Niehorster <dcnieho@gmail.com>
 doc/indevs.texi        | 34 ++++++++++++++++++++++++++++++++++
 libavdevice/avdevice.h | 10 ++++++++++
 libavdevice/version.h  |  2 +-
 3 files changed, 45 insertions(+), 1 deletion(-)
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diff --git a/doc/indevs.texi b/doc/indevs.texi
index 685b1357a6..970441ee06 100644
--- a/doc/indevs.texi
+++ b/doc/indevs.texi
@@ -668,6 +668,40 @@  $ ffmpeg -f dshow -show_video_device_dialog true -crossbar_video_input_pin_numbe
 @end itemize
+@subsection Libavdevice user notes
+The dshow device supports the @code{avdevice_app_to_dev_control_message}
+It understands the @code{AV_APP_TO_DEV_PAUSE}, @code{AV_APP_TO_DEV_PLAY}
+and @code{AV_APP_TO_DEV_TOGGLE_PAUSE} commands, which respective stop and
+start whether data is captured from the connected device, and toggle
+capture state.
+It furthermore understands the @code{AV_APP_TO_DEV_CONFIG} message, which
+requests the device to show a configuration dialog (if available). An
+@code{int} should be passed along with this command to indicate which
+configuration dialog should be shown. The bits in this @code{int} have
+the following meaning:
+@itemize @bullet
+1st bit: If set, the dialog for the audio device will be shown. If not set
+the dialog for the video device will be shown.
+2nd bit: If set, show property dialog for the audio or video capture device,
+allowing to change audio or video filter properties and configurations
+3rd bit: If set, show property dialog where crossbar pin routings of the
+audio/video device can be manually modified.
+4th bit: If set, show property dialog where TV channels and frequencies can be manually modified (in case of video device), or TV audio (like mono vs. stereo, Language A, B or C) can be manually modified in case of audio device.
+@end itemize
 @section fbdev
 Linux framebuffer input device.
diff --git a/libavdevice/avdevice.h b/libavdevice/avdevice.h
index 6f24976dcc..bbeb1ae21b 100644
--- a/libavdevice/avdevice.h
+++ b/libavdevice/avdevice.h
@@ -190,6 +190,16 @@  enum AVAppToDevMessageType {
     AV_APP_TO_DEV_GET_VOLUME = MKBETAG('G', 'V', 'O', 'L'),
     AV_APP_TO_DEV_GET_MUTE   = MKBETAG('G', 'M', 'U', 'T'),
+    /**
+     * Request to show configuration dialog.
+     * 
+     * If device has a configuration dialog of type indicated by
+     * data, show it.
+     * 
+     * data: int (device-specific).
+     */
+    AV_APP_TO_DEV_CONFIG = MKBETAG('C', 'O', 'N', 'F'),
diff --git a/libavdevice/version.h b/libavdevice/version.h
index 6e593ba00e..0381d6cd0d 100644
--- a/libavdevice/version.h
+++ b/libavdevice/version.h
@@ -28,7 +28,7 @@ 
 #include "libavutil/version.h"