diff mbox series

[FFmpeg-devel,07/35] avdevice/dshow: list_devices: show media type(s) per device

Message ID 20210607230414.612-8-dcnieho@gmail.com
State Superseded, archived
Headers show
Series avdevice (mostly dshow) enhancements
Related show

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Context Check Description
andriy/x86_make success Make finished
andriy/x86_make_fate success Make fate finished
andriy/PPC64_make success Make finished
andriy/PPC64_make_fate success Make fate finished

Commit Message

Diederick C. Niehorster June 7, 2021, 11:03 p.m. UTC
the list_devices option of dshow didn't indicate whether a specific device provides audio or video output. This patch iterates through all media formats of all pins exposed by the device to see what types it provides for capture, and prints this to the console for each device. Importantly, this now allows to find devices that provide both audio and video, and devices that provide neither.

Signed-off-by: Diederick Niehorster <dcnieho@gmail.com>
---
 libavdevice/dshow.c | 103 +++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 98 insertions(+), 5 deletions(-)
diff mbox series

Patch

diff --git a/libavdevice/dshow.c b/libavdevice/dshow.c
index 25de6b1acd..5d7f065a8c 100644
--- a/libavdevice/dshow.c
+++ b/libavdevice/dshow.c
@@ -197,6 +197,79 @@  fail:
     return;
 }
 
+static void dshow_get_device_media_types(AVFormatContext *avctx, enum dshowDeviceType devtype,
+                                         enum dshowSourceFilterType sourcetype, IBaseFilter *device_filter,
+                                         enum AVMediaType **media_types, int *nb_media_types)
+{
+    struct dshow_ctx *ctx = avctx->priv_data;
+    IEnumPins *pins = 0;
+    IPin *pin;
+    int has_audio = 0, has_video = 0;
+
+    if (IBaseFilter_EnumPins(device_filter, &pins) != S_OK)
+        return;
+
+    while (IEnumPins_Next(pins, 1, &pin, NULL) == S_OK) {
+        IKsPropertySet *p = NULL;
+        PIN_INFO info = { 0 };
+        GUID category;
+        DWORD r2;
+        IEnumMediaTypes *types = NULL;
+        AM_MEDIA_TYPE *type;
+
+        if (IPin_QueryPinInfo(pin, &info) != S_OK)
+            goto next;
+        IBaseFilter_Release(info.pFilter);
+
+        if (info.dir != PINDIR_OUTPUT)
+            goto next;
+        if (IPin_QueryInterface(pin, &IID_IKsPropertySet, (void **) &p) != S_OK)
+            goto next;
+        if (IKsPropertySet_Get(p, &AMPROPSETID_Pin, AMPROPERTY_PIN_CATEGORY,
+                               NULL, 0, &category, sizeof(GUID), &r2) != S_OK)
+            goto next;
+        if (!IsEqualGUID(&category, &PIN_CATEGORY_CAPTURE))
+            goto next;
+
+        if (IPin_EnumMediaTypes(pin, &types) != S_OK)
+            goto next;
+
+        // enumerate media types exposed by pin
+        // NB: don't know if a pin can expose both audio and video, check 'm all to be safe
+        IEnumMediaTypes_Reset(types);
+        while (IEnumMediaTypes_Next(types, 1, &type, NULL) == S_OK) {
+            if (IsEqualGUID(&type->majortype, &MEDIATYPE_Video)) {
+                has_video = 1;
+            } else if (IsEqualGUID(&type->majortype, &MEDIATYPE_Audio)) {
+                has_audio = 1;
+            }
+            CoTaskMemFree(type);
+        }
+
+    next:
+        if (types)
+            IEnumMediaTypes_Release(types);
+        if (p)
+            IKsPropertySet_Release(p);
+        if (pin)
+            IPin_Release(pin);
+    }
+
+    IEnumPins_Release(pins);
+
+    if (has_audio || has_video) {
+        int nb_types = has_audio + has_video;
+        *media_types = av_malloc_array(nb_types, sizeof(enum AVMediaType));
+        if (*media_types) {
+            if (has_audio)
+                *media_types[0] = AVMEDIA_TYPE_AUDIO;
+            if (has_video)
+                *media_types[0+has_audio] = AVMEDIA_TYPE_VIDEO;
+            *nb_media_types = nb_types;
+        }
+    }
+}
+
 /**
  * Cycle through available devices using the device enumerator devenum,
  * retrieve the device with type specified by devtype and return the
@@ -242,6 +315,8 @@  dshow_cycle_devices(AVFormatContext *avctx, ICreateDevEnum *devenum,
         LPOLESTR olestr = NULL;
         LPMALLOC co_malloc = NULL;
         AVDeviceInfo *device = NULL;
+        enum AVMediaType *media_types = NULL;
+        int nb_media_types = 0;
         int i;
 
         r = CoGetMalloc(1, &co_malloc);
@@ -286,6 +361,12 @@  dshow_cycle_devices(AVFormatContext *avctx, ICreateDevEnum *devenum,
                 // success, loop will end now
             }
         } else {
+            // get media types exposed by pins of device
+            if (IMoniker_BindToObject(m, 0, 0, &IID_IBaseFilter, (void* ) &device_filter) == S_OK) {
+                dshow_get_device_media_types(avctx, devtype, sourcetype, device_filter, &media_types, &nb_media_types);
+                IBaseFilter_Release(device_filter);
+                device_filter = NULL;
+            }
             if (device_list) {
                 device = av_mallocz(sizeof(AVDeviceInfo));
                 if (!device)
@@ -306,12 +387,26 @@  dshow_cycle_devices(AVFormatContext *avctx, ICreateDevEnum *devenum,
                 device = NULL;  // copied into array, make sure not freed below
             }
             else {
-                av_log(avctx, AV_LOG_INFO, " \"%s\"\n", friendly_name);
-                av_log(avctx, AV_LOG_INFO, "    Alternative name \"%s\"\n", unique_name);
+                av_log(avctx, AV_LOG_INFO, "\"%s\"", friendly_name);
+                if (nb_media_types > 0 && media_types) {
+                    const char* media_type = av_get_media_type_string(media_types[0]);
+                    av_log(NULL, AV_LOG_INFO, " (%s", media_type ? media_type : "unknown");
+                    for (int i = 1; i < nb_media_types; ++i) {
+                        media_type = av_get_media_type_string(media_types[i]);
+                        av_log(NULL, AV_LOG_INFO, ", %s", media_type ? media_type : "unknown");
+                    }
+                    av_log(NULL, AV_LOG_INFO, ")");
+                } else {
+                    av_log(NULL, AV_LOG_INFO, " (none)");
+                }
+                av_log(avctx, AV_LOG_INFO, "\n");
+                av_log(avctx, AV_LOG_INFO, "  Alternative name \"%s\"\n", unique_name);
             }
         }
 
-fail1:
+    fail1:
+        if (media_types)
+            av_freep(&media_types);
         if (device) {
             if (device->device_name)
                 av_freep(&device->device_name);
@@ -1194,9 +1289,7 @@  static int dshow_read_header(AVFormatContext *avctx)
     }
 
     if (ctx->list_devices) {
-        av_log(avctx, AV_LOG_INFO, "DirectShow video devices (some may be both video and audio devices)\n");
         dshow_cycle_devices(avctx, devenum, VideoDevice, VideoSourceDevice, NULL, NULL, NULL);
-        av_log(avctx, AV_LOG_INFO, "DirectShow audio devices\n");
         dshow_cycle_devices(avctx, devenum, AudioDevice, AudioSourceDevice, NULL, NULL, NULL);
         ret = AVERROR_EXIT;
         goto error;