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dshow: generic error handling in init
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Handle eventual error generically, currently only in init.

Print also error description (will be perhaps just a code for DShow
for now).
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@MartinPulec
MartinPulec committed Jan 19, 2024
1 parent 1fa19a6 commit 604bbf9
Showing 1 changed file with 34 additions and 88 deletions.
122 changes: 34 additions & 88 deletions src/video_capture/DirectShowGrabber.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -805,6 +805,14 @@ static void vidcap_dshow_should_exit(void *state) {
}

static int vidcap_dshow_init(struct vidcap_params *params, void **state) {
#define HANDLE_ERR(res, msg, ...) \
do { \
if (res != S_OK) { \
MSG(ERROR, "vidcap_dshow_init: " msg ": %s\n", \
__VA_ARGS__ __VA_OPT__(, ) hresult_to_str(res)); \
goto error; \
} \
} while (0)
struct vidcap_dshow_state *s;
HRESULT res;

Expand Down Expand Up @@ -873,69 +881,42 @@ static int vidcap_dshow_init(struct vidcap_params *params, void **state) {
<< get_friendly_name(s->moniker) << "\n";

res = s->moniker->BindToObject(NULL, NULL, IID_IBaseFilter, (void **) &s->captureFilter);
if (res != S_OK) {
log_msg(LOG_LEVEL_ERROR, MOD_NAME "vidcap_dshow_init: Cannot bind capture filter to device.\n");
goto error;
}
HANDLE_ERR(res, "Cannot bind capture filter to device");

res = s->filterGraph->AddFilter(s->captureFilter, L"Capture filter");
if (res != S_OK) {
log_msg(LOG_LEVEL_ERROR, MOD_NAME "vidcap_dshow_init: Cannot add capture filter to filter graph.\n");
goto error;
}
HANDLE_ERR(res, "Cannot add capture filter to filter graph");

res = s->graphBuilder->FindInterface(&PIN_CATEGORY_CAPTURE, &MEDIATYPE_Video, s->captureFilter,
IID_IAMStreamConfig, (void **) &s->streamConfig);
if (res != S_OK) {
log_msg(LOG_LEVEL_ERROR, MOD_NAME "vidcap_dshow_init: Cannot find interface for reading capture capabilites.\n");
goto error;
}
HANDLE_ERR(res, "Cannot find interface for reading capture capabilites");

// create instance of sample grabber
res = CoCreateInstance(CLSID_SampleGrabber, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&s->sampleGrabberFilter));
if (res != S_OK) {
log_msg(LOG_LEVEL_ERROR, MOD_NAME "vidcap_dshow_init: Cannot create instance of sample grabber.\n");
goto error;
}
HANDLE_ERR(res, "Cannot create instance of sample grabber");

// add the sample grabber to filter graph
res = s->filterGraph->AddFilter(s->sampleGrabberFilter, L"Sample Grabber");
if (res != S_OK) {
log_msg(LOG_LEVEL_ERROR, MOD_NAME "vidcap_dshow_init: Cannot add sample grabber to filter graph.\n");
goto error;
}
HANDLE_ERR(res, "Cannot add sample grabber to filter graph");

// query the sample grabber filter for control interface
res = s->sampleGrabberFilter->QueryInterface(IID_PPV_ARGS(&s->sampleGrabber));
if (res != S_OK) {
log_msg(LOG_LEVEL_ERROR, MOD_NAME "vidcap_dshow_init: Cannot query sample grabber filter for control interface.\n");
goto error;
}
HANDLE_ERR(res, "Cannot query sample grabber filter for control interface");

// make the sample grabber buffer frames
res = s->sampleGrabber->SetBufferSamples(TRUE);
if (res != S_OK) {
log_msg(LOG_LEVEL_ERROR, MOD_NAME "vidcap_dshow_init: Cannot set sample grabber to buffer samples.\n");
goto error;
}
HANDLE_ERR(res, "Cannot set sample grabber to buffer samples");

// set media type for sample grabber; this is not done a very detailed setup, because it would be unneccessarily complicated to do so
AM_MEDIA_TYPE sampleGrabberMT;
ZeroMemory(&sampleGrabberMT, sizeof(sampleGrabberMT));
sampleGrabberMT.majortype = MEDIATYPE_Video;
sampleGrabberMT.subtype = MEDIASUBTYPE_RGB24;
res = s->sampleGrabber->SetMediaType(&sampleGrabberMT);
if (res != S_OK) {
log_msg(LOG_LEVEL_ERROR, MOD_NAME "vidcap_dshow_init: Cannot setup media type of grabber filter.\n");
goto error;
}
HANDLE_ERR(res, "Cannot setup media type of grabber filter");

int capCount, capSize;
res = s->streamConfig->GetNumberOfCapabilities(&capCount, &capSize);
if (res != S_OK) {
log_msg(LOG_LEVEL_ERROR, MOD_NAME "vidcap_dshow_init: Cannot read number of capture capabilites.\n");
goto error;
}
HANDLE_ERR(res, "Cannot read number of capture capabilites");
if (capSize != sizeof(VIDEO_STREAM_CONFIG_CAPS)) {
log_msg(LOG_LEVEL_ERROR, MOD_NAME "vidcap_dshow_init: Unknown format of capture capabilites.\n");
goto error;
Expand All @@ -954,10 +935,10 @@ static int vidcap_dshow_init(struct vidcap_params *params, void **state) {
goto error;
}
// Some other error occured
if (res != S_OK) {
log_msg(LOG_LEVEL_ERROR, MOD_NAME "vidcap_dshow_help: Cannot read stream capabilities #%d (index is correct).\n", s->modeNumber);
goto error;
}
HANDLE_ERR(
res,
"Cannot read stream capabilities #%d (index is correct)",
s->modeNumber);

if (s->desc.color_spec != VIDEO_CODEC_NONE) {
MSG(WARNING, "Mode set explicitly, specified "
Expand All @@ -969,11 +950,8 @@ static int vidcap_dshow_init(struct vidcap_params *params, void **state) {
goto error;
}
res = s->sampleGrabber->SetMediaType(mediaType);
if (res != S_OK) {
MSG(ERROR, "vidcap_dshow_init: Cannot setup media type "
"of grabber filter.");
goto error;
}
HANDLE_ERR(res, "Cannot setup media type "
"of grabber filter");

struct video_desc desc = vidcap_dshow_get_video_desc(mediaType);
s->desc.width = desc.width;
Expand Down Expand Up @@ -1010,10 +988,7 @@ static int vidcap_dshow_init(struct vidcap_params *params, void **state) {

if (s->modeNumber < 0) { // mode number was not set by user directly
s->streamConfig->GetFormat(&mediaType);
if (res != S_OK) {
log_msg(LOG_LEVEL_ERROR, MOD_NAME "vidcap_dshow_init: Cannot get current capture format.\n");
goto error;
}
HANDLE_ERR(res, "Cannot get current capture format");
switch (s->desc.color_spec) {
case BGR : mediaType->subtype = MEDIASUBTYPE_RGB24;
break;
Expand All @@ -1030,10 +1005,7 @@ static int vidcap_dshow_init(struct vidcap_params *params, void **state) {
infoHeader->AvgTimePerFrame = (REFERENCE_TIME) (1e7 / s->desc.fps);
}
res = s->streamConfig->SetFormat(mediaType);
if (res != S_OK) {
log_msg(LOG_LEVEL_ERROR, MOD_NAME "vidcap_dshow_init: Cannot set capture format.\n");
goto error;
}
HANDLE_ERR(res, "Cannot set capture format");
DeleteMediaType(mediaType);

if (s->convert_YUYV_RGB) {
Expand All @@ -1059,25 +1031,16 @@ static int vidcap_dshow_init(struct vidcap_params *params, void **state) {
// Create null renderer discarding all incoming frames
res = CoCreateInstance(CLSID_NullRenderer, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter,
(void **) &s->nullRenderer);
if (res != S_OK) {
log_msg(LOG_LEVEL_ERROR, MOD_NAME "vidcap_dshow_init: Cannot create NullRenderer.\n");
goto error;
}
HANDLE_ERR(res, "Cannot create NullRenderer");

res = s->filterGraph->AddFilter(s->nullRenderer, L"NullRenderer");
if (res != S_OK) {
log_msg(LOG_LEVEL_ERROR, MOD_NAME "vidcap_dshow_init: Cannot add null renderer to filter graph.\n");
goto error;
}
HANDLE_ERR(res, "Cannot add null renderer to filter graph");

IEnumPins *pinEnum;
IPin *pin;

res = s->captureFilter->EnumPins(&pinEnum);
if (res != S_OK) {
log_msg(LOG_LEVEL_ERROR, MOD_NAME "vidcap_dshow_init: Error enumerating pins of capture filter.\n");
goto error;
}
HANDLE_ERR(res, "Error enumerating pins of capture filter");

while (pinEnum->Next(1, &pin, NULL) == S_OK) {
res = ConnectFilters(s->filterGraph, pin, s->sampleGrabberFilter);
Expand All @@ -1086,17 +1049,10 @@ static int vidcap_dshow_init(struct vidcap_params *params, void **state) {
break;
}
}
if (res != S_OK) {
MSG(ERROR, "vidcap_dshow_init: Cannot connect capture "
"filter to sample grabber: %s.\n", hresult_to_str(res));
goto error;
}
HANDLE_ERR(res, "Cannot connect capture filter to sample grabber");

res = ConnectFilters(s->filterGraph, s->sampleGrabberFilter, s->nullRenderer);
if (res != S_OK) {
log_msg(LOG_LEVEL_ERROR, MOD_NAME "vidcap_dshow_init: Cannot connect sample grabber to null renderer.\n");
goto error;
}
HANDLE_ERR(res, "Cannot connect sample grabber to null renderer");

s->SGCallback = new SampleGrabberCallback(s, &s->frames);
s->sampleGrabber->SetCallback(s->SGCallback, 1);
Expand All @@ -1111,10 +1067,7 @@ static int vidcap_dshow_init(struct vidcap_params *params, void **state) {
*/

res = s->filterGraph->QueryInterface(IID_IMediaControl, (void **) &s->mediaControl);
if (res != S_OK) {
log_msg(LOG_LEVEL_ERROR, MOD_NAME "vidcap_dshow_init: Cannot find media control interface.\n");
goto error;
}
HANDLE_ERR(res, "Cannot find media control interface");

FILTER_STATE fs;
res = s->mediaControl->Run();
Expand All @@ -1123,17 +1076,9 @@ static int vidcap_dshow_init(struct vidcap_params *params, void **state) {
break;
}
}
if (res != S_OK) {
log_msg(LOG_LEVEL_ERROR, MOD_NAME "vidcap_dshow_init: Cannot run filter graph.\n");
ErrorDescription(res);
goto error;
}
HANDLE_ERR(res, "Cannot run filter graph");
res = s->sampleGrabberFilter->GetState(INFINITE, &fs);
if (res != S_OK) {
log_msg(LOG_LEVEL_ERROR, MOD_NAME "filter getstate error\n");
ErrorDescription(res);
goto error;
}
HANDLE_ERR(res, "filter getstate error");

s->frame = vf_alloc_desc(s->desc);
register_should_exit_callback(vidcap_params_get_parent(params), vidcap_dshow_should_exit, s);
Expand All @@ -1144,6 +1089,7 @@ static int vidcap_dshow_init(struct vidcap_params *params, void **state) {
error:
cleanup(s);
return VIDCAP_INIT_FAIL;
#undef HANDLE_ERR
}

static void vidcap_dshow_done(void *state) {
Expand Down

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