gstreamer/sys/dshowsrcwrapper/gstdshow.cpp

761 lines
22 KiB
C++

/* GStreamer
* Copyright (C) 2007 Sebastien Moutte <sebastien@moutte.net>
*
* gstdshow.cpp:
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include <gst/video/video-format.h>
#include "gstdshow.h"
#include "gstdshowfakesink.h"
#include "gstdshowvideosrc.h"
GST_DEBUG_CATEGORY_EXTERN (dshowsrcwrapper_debug);
#define GST_CAT_DEFAULT dshowsrcwrapper_debug
gchar *
wchar_to_gchar (WCHAR * w)
{
return g_utf16_to_utf8 ((const gunichar2 *) w, wcslen (w), NULL, NULL, NULL);
}
const GUID MEDIASUBTYPE_I420
= { 0x30323449, 0x0000, 0x0010, {0x80, 0x00, 0x00, 0xAA, 0x00, 0x38, 0x9B,
0x71}
};
void
gst_dshow_free_mediatype (AM_MEDIA_TYPE * pmt)
{
if (pmt != NULL) {
if (pmt->cbFormat != 0) {
CoTaskMemFree ((PVOID) pmt->pbFormat);
pmt->cbFormat = 0;
pmt->pbFormat = NULL;
}
if (pmt->pUnk != NULL) {
/* Unnecessary because pUnk should not be used, but safest. */
pmt->pUnk->Release ();
pmt->pUnk = NULL;
}
CoTaskMemFree (pmt);
}
}
void
gst_dshow_free_pin_mediatype (gpointer pt)
{
GstCapturePinMediaType *pin_mediatype = (GstCapturePinMediaType *) pt;
if (pin_mediatype) {
if (pin_mediatype->capture_pin) {
pin_mediatype->capture_pin->Release ();
pin_mediatype->capture_pin = NULL;
}
if (pin_mediatype->mediatype) {
gst_dshow_free_mediatype (pin_mediatype->mediatype);
pin_mediatype->mediatype = NULL;
}
}
}
GstCapturePinMediaType *
gst_dshow_new_pin_mediatype (IPin * pin)
{
GstCapturePinMediaType *pin_mediatype = g_new0 (GstCapturePinMediaType, 1);
pin->AddRef ();
pin_mediatype->capture_pin = pin;
return pin_mediatype;
}
GstCapturePinMediaType *
gst_dshow_new_pin_mediatype_from_enum_mediatypes (IPin * pin, IEnumMediaTypes *enum_mediatypes)
{
GstCapturePinMediaType *pin_mediatype = gst_dshow_new_pin_mediatype (pin);
VIDEOINFOHEADER *video_info = NULL;
HRESULT hres = enum_mediatypes->Next (1, &pin_mediatype->mediatype, NULL);
if (hres != S_OK || !pin_mediatype->mediatype) {
gst_dshow_free_pin_mediatype (pin_mediatype);
return NULL;
}
video_info = (VIDEOINFOHEADER *) pin_mediatype->mediatype->pbFormat;
pin_mediatype->defaultWidth = video_info->bmiHeader.biWidth;
pin_mediatype->defaultHeight = video_info->bmiHeader.biHeight;
pin_mediatype->defaultFPS = (gint) (10000000 / video_info->AvgTimePerFrame);
pin_mediatype->granularityWidth = 1;
pin_mediatype->granularityHeight = 1;
return pin_mediatype;
}
GstCapturePinMediaType *
gst_dshow_new_pin_mediatype_from_streamcaps (IPin * pin, gint id, IAMStreamConfig * streamcaps)
{
GstCapturePinMediaType *pin_mediatype = gst_dshow_new_pin_mediatype (pin);
VIDEOINFOHEADER *video_info = NULL;
HRESULT hres = streamcaps->GetStreamCaps (id, &pin_mediatype->mediatype,
(BYTE *) & pin_mediatype->vscc);
if (FAILED (hres) || !pin_mediatype->mediatype) {
gst_dshow_free_pin_mediatype (pin_mediatype);
return NULL;
}
video_info = (VIDEOINFOHEADER *) pin_mediatype->mediatype->pbFormat;
pin_mediatype->defaultWidth = video_info->bmiHeader.biWidth;
pin_mediatype->defaultHeight = video_info->bmiHeader.biHeight;
pin_mediatype->defaultFPS = (gint) (10000000 / video_info->AvgTimePerFrame);
pin_mediatype->granularityWidth = pin_mediatype->vscc.OutputGranularityX;
pin_mediatype->granularityHeight = pin_mediatype->vscc.OutputGranularityY;
return pin_mediatype;
}
void
gst_dshow_free_pins_mediatypes (GList * pins_mediatypes)
{
g_list_free_full (pins_mediatypes,
(GDestroyNotify) gst_dshow_free_pin_mediatype);
}
gboolean
gst_dshow_check_mediatype (AM_MEDIA_TYPE * media_type, const GUID sub_type,
const GUID format_type)
{
RPC_STATUS rpcstatus;
g_return_val_if_fail (media_type != NULL, FALSE);
return
UuidCompare (&media_type->subtype, (UUID *) & sub_type,
&rpcstatus) == 0 && rpcstatus == RPC_S_OK &&
//IsEqualGUID (&media_type->subtype, &sub_type)
UuidCompare (&media_type->formattype, (UUID *) & format_type,
&rpcstatus) == 0 && rpcstatus == RPC_S_OK;
}
gboolean
gst_dshow_get_pin_from_filter (IBaseFilter * filter, PIN_DIRECTION pindir,
IPin ** pin)
{
gboolean ret = FALSE;
IEnumPins *enumpins = NULL;
IPin *pintmp = NULL;
HRESULT hres;
*pin = NULL;
hres = filter->EnumPins (&enumpins);
if (FAILED (hres)) {
return ret;
}
while (enumpins->Next (1, &pintmp, NULL) == S_OK) {
PIN_DIRECTION pindirtmp;
hres = pintmp->QueryDirection (&pindirtmp);
if (hres == S_OK && pindir == pindirtmp) {
*pin = pintmp;
ret = TRUE;
break;
}
pintmp->Release ();
}
enumpins->Release ();
return ret;
}
gboolean
gst_dshow_find_filter (CLSID input_majortype, CLSID input_subtype,
CLSID output_majortype, CLSID output_subtype,
gchar * prefered_filter_name, IBaseFilter ** filter)
{
gboolean ret = FALSE;
HRESULT hres;
GUID arrayInTypes[2];
GUID arrayOutTypes[2];
IFilterMapper2 *mapper = NULL;
IEnumMoniker *enum_moniker = NULL;
IMoniker *moniker = NULL;
ULONG fetched;
gchar *prefered_filter_upper = NULL;
gboolean exit = FALSE;
/* initialize output parameter */
if (filter)
*filter = NULL;
/* create a private copy of preferred filter substring in upper case */
if (prefered_filter_name) {
prefered_filter_upper = g_strdup (prefered_filter_name);
_strupr (prefered_filter_upper);
}
hres = CoCreateInstance (CLSID_FilterMapper2, NULL, CLSCTX_INPROC,
IID_IFilterMapper2, (void **) &mapper);
if (FAILED (hres))
goto clean;
memcpy (&arrayInTypes[0], &input_majortype, sizeof (CLSID));
memcpy (&arrayInTypes[1], &input_subtype, sizeof (CLSID));
memcpy (&arrayOutTypes[0], &output_majortype, sizeof (CLSID));
memcpy (&arrayOutTypes[1], &output_subtype, sizeof (CLSID));
hres =
mapper->EnumMatchingFilters (&enum_moniker, 0, FALSE,
MERIT_DO_NOT_USE + 1, TRUE, 1, arrayInTypes, NULL, NULL, FALSE, TRUE, 1,
arrayOutTypes, NULL, NULL);
if (FAILED (hres))
goto clean;
enum_moniker->Reset ();
while (hres = enum_moniker->Next (1, &moniker, &fetched), hres == S_OK
&& !exit) {
IBaseFilter *filter_temp = NULL;
IPropertyBag *property_bag = NULL;
gchar *friendly_name = NULL;
hres =
moniker->BindToStorage (NULL, NULL, IID_IPropertyBag,
(void **) &property_bag);
if (SUCCEEDED (hres) && property_bag) {
VARIANT varFriendlyName;
VariantInit (&varFriendlyName);
hres = property_bag->Read (L"FriendlyName", &varFriendlyName, NULL);
if (hres == S_OK && varFriendlyName.bstrVal) {
friendly_name = wchar_to_gchar (varFriendlyName.bstrVal);
if (friendly_name)
_strupr (friendly_name);
SysFreeString (varFriendlyName.bstrVal);
}
property_bag->Release ();
}
hres =
moniker->BindToObject (NULL, NULL, IID_IBaseFilter,
(void **) &filter_temp);
if (SUCCEEDED (hres) && filter_temp) {
ret = TRUE;
if (filter) {
if (*filter)
(*filter)->Release ();
*filter = filter_temp;
(*filter)->AddRef ();
if (prefered_filter_upper && friendly_name &&
strstr (friendly_name, prefered_filter_upper))
exit = TRUE;
}
/* if we just want to know if the formats are supported OR
if we don't care about what will be the filter used
=> we can stop enumeration */
if (!filter || !prefered_filter_upper)
exit = TRUE;
filter_temp->Release ();
}
g_free (friendly_name);
moniker->Release ();
}
clean:
g_free (prefered_filter_upper);
if (enum_moniker)
enum_moniker->Release ();
if (mapper)
mapper->Release ();
return ret;
}
void
gst_dshow_device_entry_free (DshowDeviceEntry * entry)
{
if (entry) {
g_free (entry->device);
entry->device = NULL;
g_free (entry->device_name);
entry->device_name = NULL;
if (entry->caps) {
gst_caps_unref (entry->caps);
entry->caps = NULL;
}
if (entry->moniker) {
entry->moniker->Release ();
entry->moniker = NULL;
}
}
}
void
gst_dshow_device_list_free (GList * devices)
{
GList *cur;
for (cur = devices; cur != NULL; cur = cur->next)
gst_dshow_device_entry_free ((DshowDeviceEntry *) cur->data);
g_list_free (devices);
}
GList *
gst_dshow_enumerate_devices (const GUID * device_category, gboolean getcaps)
{
GList *result = NULL;
ICreateDevEnum *devices_enum = NULL;
IEnumMoniker *enum_moniker = NULL;
IMoniker *moniker = NULL;
HRESULT hres = S_FALSE;
ULONG fetched;
gint devidx = -1;
hres = CoCreateInstance (CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER,
IID_ICreateDevEnum, (void **) &devices_enum);
if (hres != S_OK) {
GST_ERROR ("Failed to create System Device Enumerator");
goto clean;
}
hres = devices_enum->CreateClassEnumerator (*device_category,
&enum_moniker, 0);
if (hres != S_OK || !enum_moniker) {
GST_ERROR ("Failed to create audio/video class device enumerator");
goto clean;
}
enum_moniker->Reset ();
while (enum_moniker->Next (1, &moniker, &fetched) == S_OK) {
IPropertyBag *property_bag = NULL;
hres = moniker->BindToStorage (NULL, NULL, IID_IPropertyBag,
(void **) &property_bag);
if (SUCCEEDED (hres) && property_bag) {
VARIANT varFriendlyName;
VariantInit (&varFriendlyName);
hres = property_bag->Read (L"FriendlyName", &varFriendlyName, NULL);
if (hres == S_OK && varFriendlyName.bstrVal) {
gchar *friendly_name = wchar_to_gchar (varFriendlyName.bstrVal);
devidx++;
GST_DEBUG ("Found device idx=%d: device-name='%s'",
devidx, friendly_name);
WCHAR *wszDisplayName = NULL;
hres = moniker->GetDisplayName (NULL, NULL, &wszDisplayName);
if (hres == S_OK && wszDisplayName) {
DshowDeviceEntry *entry = g_new0 (DshowDeviceEntry, 1);
gchar *device_path = NULL;
GstCaps *caps = NULL;
device_path = wchar_to_gchar (wszDisplayName);
CoTaskMemFree (wszDisplayName);
/* getting caps can be slow, so make it optional when enumerating */
if (getcaps) {
IBindCtx *lpbc = NULL;
hres = CreateBindCtx (0, &lpbc);
if (SUCCEEDED (hres)) {
IBaseFilter *video_cap_filter = NULL;
hres = moniker->BindToObject (lpbc, NULL, IID_IBaseFilter,
(LPVOID *) & video_cap_filter);
if (video_cap_filter) {
caps = gst_dshowvideosrc_getcaps_from_capture_filter (video_cap_filter, NULL);
video_cap_filter->Release ();
}
lpbc->Release ();
}
}
entry->device = device_path;
entry->device_name = friendly_name;
entry->device_index = devidx;
entry->caps = caps;
entry->moniker = moniker;
moniker = NULL;
result = g_list_append (result, entry);
} else {
g_free (friendly_name);
}
SysFreeString (varFriendlyName.bstrVal);
}
property_bag->Release ();
}
if (moniker) {
moniker->Release ();
}
}
clean:
if (enum_moniker) {
enum_moniker->Release ();
}
if (devices_enum) {
devices_enum->Release ();
}
return result;
}
DshowDeviceEntry *
gst_dshow_select_device (const GUID * device_category,
const gchar * device, const gchar * device_name, const gint device_index)
{
GList *devices = NULL;
GList *item = NULL;
DshowDeviceEntry *selected = NULL;
GST_DEBUG ("Trying to select device-index=%d, device-name='%s', device='%s'",
device_index, device_name, device);
devices = gst_dshow_enumerate_devices (&CLSID_VideoInputDeviceCategory, FALSE);
for (item = devices; item != NULL; item = item->next) {
DshowDeviceEntry *entry = (DshowDeviceEntry *) item->data;
/* device will be used first, then device-name, then device-index */
if (device && g_strcmp0 (device, entry->device) == 0) {
selected = entry;
break;
} else if (!device && device_name && g_strcmp0 (device_name, entry->device_name) == 0) {
selected = entry;
break;
} else if (!device && !device_name && device_index == entry->device_index) {
selected = entry;
break;
}
}
if (selected) {
devices = g_list_remove (devices, selected);
GST_DEBUG ("Selected device-index=%d, device-name='%s', device='%s'",
selected->device_index, selected->device_name, selected->device);
} else {
GST_DEBUG ("No matching device found");
}
gst_dshow_device_list_free (devices);
return selected;
}
IBaseFilter *
gst_dshow_create_capture_filter (IMoniker *moniker)
{
HRESULT hres = S_OK;
IBindCtx *lpbc = NULL;
IBaseFilter *video_cap_filter = NULL;
g_assert (moniker != NULL);
hres = CreateBindCtx (0, &lpbc);
if (SUCCEEDED (hres)) {
hres = moniker->BindToObject (lpbc, NULL, IID_IBaseFilter,
(LPVOID *) & video_cap_filter);
lpbc->Release ();
}
return video_cap_filter;
}
gchar *
gst_dshow_getdevice_from_devicename (const GUID * device_category,
gchar ** device_name, gint * device_index)
{
gchar *ret = NULL;
ICreateDevEnum *devices_enum = NULL;
IEnumMoniker *enum_moniker = NULL;
IMoniker *moniker = NULL;
HRESULT hres = S_FALSE;
ULONG fetched;
gboolean bfound = FALSE;
gint devidx = -1;
hres = CoCreateInstance (CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER,
IID_ICreateDevEnum, (void **) &devices_enum);
if (hres != S_OK) {
GST_ERROR ("Failed to create System Device Enumerator");
goto clean;
}
hres = devices_enum->CreateClassEnumerator (*device_category,
&enum_moniker, 0);
if (hres != S_OK || !enum_moniker) {
GST_ERROR ("Failed to create audio/video class device enumerator");
goto clean;
}
enum_moniker->Reset ();
while (hres = enum_moniker->Next (1, &moniker, &fetched), hres == S_OK
&& !bfound) {
IPropertyBag *property_bag = NULL;
hres =
moniker->BindToStorage (NULL, NULL, IID_IPropertyBag,
(void **) &property_bag);
if (SUCCEEDED (hres) && property_bag) {
VARIANT varFriendlyName;
VariantInit (&varFriendlyName);
hres = property_bag->Read (L"FriendlyName", &varFriendlyName, NULL);
if (hres == S_OK && varFriendlyName.bstrVal) {
gchar *friendly_name = wchar_to_gchar (varFriendlyName.bstrVal);
devidx++;
GST_DEBUG ("Found device idx=%d: device-name='%s'",
devidx, friendly_name);
if ((!*device_name || !**device_name) && devidx == *device_index) {
g_free (*device_name);
*device_name = g_strdup (friendly_name);
}
if ((*device_name && **device_name)
&& _stricmp (*device_name, friendly_name) == 0) {
WCHAR *wszDisplayName = NULL;
hres = moniker->GetDisplayName (NULL, NULL, &wszDisplayName);
if (hres == S_OK && wszDisplayName) {
*device_index = devidx;
ret = wchar_to_gchar (wszDisplayName);
CoTaskMemFree (wszDisplayName);
}
bfound = TRUE;
}
SysFreeString (varFriendlyName.bstrVal);
}
property_bag->Release ();
}
moniker->Release ();
}
clean:
if (enum_moniker) {
enum_moniker->Release ();
}
if (devices_enum) {
devices_enum->Release ();
}
return ret;
}
gboolean
gst_dshow_show_propertypage (IBaseFilter * base_filter)
{
gboolean ret = FALSE;
ISpecifyPropertyPages *pProp = NULL;
HRESULT hres =
base_filter->QueryInterface (IID_ISpecifyPropertyPages, (void **) &pProp);
if (SUCCEEDED (hres)) {
/* Get the filter's name and IUnknown pointer. */
FILTER_INFO FilterInfo;
CAUUID caGUID;
IUnknown *pFilterUnk = NULL;
hres = base_filter->QueryFilterInfo (&FilterInfo);
base_filter->QueryInterface (IID_IUnknown, (void **) &pFilterUnk);
/* Show the page. */
pProp->GetPages (&caGUID);
pProp->Release ();
OleCreatePropertyFrame (GetDesktopWindow (), 0, 0, FilterInfo.achName,
1, &pFilterUnk, caGUID.cElems, caGUID.pElems, 0, 0, NULL);
pFilterUnk->Release ();
FilterInfo.pGraph->Release ();
CoTaskMemFree (caGUID.pElems);
}
return ret;
}
GstVideoFormat
gst_dshow_guid_to_gst_video_format (AM_MEDIA_TYPE *mediatype)
{
if (gst_dshow_check_mediatype (mediatype, MEDIASUBTYPE_I420, FORMAT_VideoInfo))
return GST_VIDEO_FORMAT_I420;
if (gst_dshow_check_mediatype (mediatype, MEDIASUBTYPE_RGB24, FORMAT_VideoInfo))
return GST_VIDEO_FORMAT_BGR;
if (gst_dshow_check_mediatype (mediatype, MEDIASUBTYPE_YUY2, FORMAT_VideoInfo))
return GST_VIDEO_FORMAT_YUY2;
if (gst_dshow_check_mediatype (mediatype, MEDIASUBTYPE_UYVY, FORMAT_VideoInfo))
return GST_VIDEO_FORMAT_UYVY;
if (gst_dshow_check_mediatype (mediatype, MEDIASUBTYPE_RGB32, FORMAT_VideoInfo))
return GST_VIDEO_FORMAT_BGRx;
if (gst_dshow_check_mediatype (mediatype, MEDIASUBTYPE_RGB565, FORMAT_VideoInfo))
return GST_VIDEO_FORMAT_BGR16;
if (gst_dshow_check_mediatype (mediatype, MEDIASUBTYPE_RGB555, FORMAT_VideoInfo))
return GST_VIDEO_FORMAT_BGR15;
if (gst_dshow_check_mediatype (mediatype, MEDIASUBTYPE_RGB8, FORMAT_VideoInfo))
return GST_VIDEO_FORMAT_GRAY8;
return GST_VIDEO_FORMAT_UNKNOWN;
}
gboolean
gst_dshow_is_pin_connected (IPin * pin)
{
IPin *tmp_pin = NULL;
gboolean res;
HRESULT hres;
g_assert (pin);
hres = pin->ConnectedTo (&tmp_pin);
res = (hres != VFW_E_NOT_CONNECTED);
if (tmp_pin)
tmp_pin->Release ();
return res;
}
GstCaps *
gst_dshow_new_video_caps (GstVideoFormat video_format, const gchar * name,
GstCapturePinMediaType * pin_mediatype)
{
GstCaps *video_caps = NULL;
GstStructure *video_structure = NULL;
gint min_w, max_w;
gint min_h, max_h;
gint min_fr, max_fr;
/* raw video format */
switch (video_format) {
case GST_VIDEO_FORMAT_BGR:
video_caps = gst_caps_from_string (GST_VIDEO_CAPS_MAKE ("BGR"));
break;
case GST_VIDEO_FORMAT_I420:
video_caps = gst_caps_from_string (GST_VIDEO_CAPS_MAKE ("I420"));
break;
case GST_VIDEO_FORMAT_YUY2:
video_caps = gst_caps_from_string (GST_VIDEO_CAPS_MAKE ("YUY2"));
break;
case GST_VIDEO_FORMAT_UYVY:
video_caps = gst_caps_from_string (GST_VIDEO_CAPS_MAKE ("UYVY"));
break;
case GST_VIDEO_FORMAT_BGRx:
video_caps = gst_caps_from_string (GST_VIDEO_CAPS_MAKE ("BGRx"));
break;
case GST_VIDEO_FORMAT_BGR16:
video_caps = gst_caps_from_string (GST_VIDEO_CAPS_MAKE ("BGR16"));
break;
case GST_VIDEO_FORMAT_BGR15:
video_caps = gst_caps_from_string (GST_VIDEO_CAPS_MAKE ("BGR15"));
break;
case GST_VIDEO_FORMAT_GRAY8:
video_caps = gst_caps_from_string (GST_VIDEO_CAPS_MAKE ("GRAY8"));
break;
default:
break;
}
/* other video format */
if (!video_caps) {
if (g_ascii_strncasecmp (name, "video/x-dv, systemstream=FALSE", 31) == 0) {
video_caps = gst_caps_new_simple ("video/x-dv",
"systemstream", G_TYPE_BOOLEAN, FALSE,
"format", G_TYPE_STRING, "dvsd",
NULL);
} else if (g_ascii_strncasecmp (name, "video/x-dv, systemstream=TRUE", 31) == 0) {
video_caps = gst_caps_new_simple ("video/x-dv",
"systemstream", G_TYPE_BOOLEAN, TRUE, NULL);
return video_caps;
} else if (g_ascii_strncasecmp (name, "image/jpeg", 10) == 0) {
video_caps = gst_caps_new_simple ("image/jpeg", NULL);
} else if (g_ascii_strncasecmp (name, "video/x-h264", 12) == 0) {
video_caps = gst_caps_new_simple ("video/x-h264", NULL);
}
}
if (!video_caps)
return NULL;
video_structure = gst_caps_get_structure (video_caps, 0);
/* Hope GST_TYPE_INT_RANGE_STEP will exits in future gstreamer releases */
/* because we could use : */
/* "width", GST_TYPE_INT_RANGE_STEP, video_default->minWidth, video_default->maxWidth, video_default->granularityWidth */
/* instead of : */
/* "width", GST_TYPE_INT_RANGE, video_default->minWidth, video_default->maxWidth */
/* For framerate we do not need a step (granularity) because */
/* "The IAMStreamConfig::SetFormat method will set the frame rate to the closest */
/* value that the filter supports" as it said in the VIDEO_STREAM_CONFIG_CAPS dshwo doc */
min_w = pin_mediatype->vscc.MinOutputSize.cx;
max_w = pin_mediatype->vscc.MaxOutputSize.cx;
min_h = pin_mediatype->vscc.MinOutputSize.cy;
max_h = pin_mediatype->vscc.MaxOutputSize.cy;
min_fr = (gint) (10000000 / pin_mediatype->vscc.MaxFrameInterval);
max_fr = (gint)(10000000 / pin_mediatype->vscc.MinFrameInterval);
if (min_w == max_w)
gst_structure_set (video_structure, "width", G_TYPE_INT, min_w, NULL);
else
gst_structure_set (video_structure,
"width", GST_TYPE_INT_RANGE, min_w, max_w, NULL);
if (min_h == max_h)
gst_structure_set (video_structure, "height", G_TYPE_INT, min_h, NULL);
else
gst_structure_set (video_structure,
"height", GST_TYPE_INT_RANGE, min_h, max_h, NULL);
if (min_fr == max_fr)
gst_structure_set (video_structure, "framerate",
GST_TYPE_FRACTION, min_fr, 1, NULL);
else
gst_structure_set (video_structure, "framerate",
GST_TYPE_FRACTION_RANGE, min_fr, 1, max_fr, 1, NULL);
return video_caps;
}
bool gst_dshow_configure_latency (IPin *pCapturePin, guint bufSizeMS)
{
HRESULT hr;
ALLOCATOR_PROPERTIES alloc_prop;
IAMBufferNegotiation * pNeg = NULL;
hr = pCapturePin->QueryInterface(IID_IAMBufferNegotiation, (void **)&pNeg);
if(!SUCCEEDED (hr))
return FALSE;
alloc_prop.cbAlign = -1; // -1 means no preference.
alloc_prop.cbBuffer = bufSizeMS;
alloc_prop.cbPrefix = -1;
alloc_prop.cBuffers = -1;
hr = pNeg->SuggestAllocatorProperties (&alloc_prop);
return SUCCEEDED (hr);
}