I'm a beginner with Bass (working right now on an MFC project) and I'm trying to figure this out.
I saw that I should start with the BASS_Init function, but I found two example, one with 4 parameters and one with 6.
When I trying to use the function, it only gives a 5-parameter version with no overloads, and when I try to use it, my app crashes. Is there a good example for using BASS on MFC that I could learn from? Or where do I find the docs for the API?
The line is:
BASS_Init(-1,44100,0,this->m_hWnd,NULL);
I've tried:
BASS_Init(-1,44100,0,GetSafeHwnd(),NULL);
but it still crashes
The BASS_Init()-function takes 5 Parameters:
BOOL BASS_Init(
int device, // The device to use... -1 = default device, 0 = no sound, 1 = first real output device
DWORD freq, // Output sample rate
DWORD flags, // A combination of flags
HWND win, // The application's main window... 0 = the current foreground window (use this for console applications)
GUID *clsid // Class identifier of the object to create, that will be used to initialize DirectSound... NULL = use default
);
Example:
int device = -1; // Default device
int freq = 44100; // Sample rate
BASS_Init(device, freq, 0, 0, NULL); // Init BASS
API Documentation: http://www.un4seen.com/doc/#bass/BASS_Init.html
Related
The problem
I am trying to get call ProcessOutput to get decoded data from my decoder and get the following error:
E_INVALIDARG One or more arguments are invalid.
What I have tried
As ProcessOutput has many arguments I have tried to pinpoint what the error might be. Documentation for ProcessOutput does not mention E_INVALIDARG. However, the documentation for MFT_OUTPUT_DATA_BUFFER, the datatype for one of the arguments, mentions in its Remarks section that:
Any other combinations are invalid and cause ProcessOutput to return E_INVALIDARG
What it talks about there is how the MFT_OUTPUT_DATA_BUFFER struct is setup. So an incorrectly setup MFT_OUTPUT_DATA_BUFFER might cause that error. I have however tried to set it up correctly.
By calling GetOutputStreamInfo I find that I need to allocate the sample sent to ProcessOutput which is what I do. I'm using pretty much the same method that worked for ProcessInput so I don't know what I am doing wrong here.
I have also tried to make sure that the other arguments, who logically should also be able to cause an E_INVALIDARG. They look good to me and I have not been able to find any other leads to which of my arguments to ProcessOutput might be invalid.
The code
I have tried to post only the relevant parts of the code below. I have removed or shortened many of the error checks for brevity. Note that I am using plain C.
"Prelude"
...
hr = pDecoder->lpVtbl->SetOutputType(pDecoder, dwOutputStreamID, pMediaOut, dwFlags);
...
// Send input to decoder
hr = pDecoder->lpVtbl->ProcessInput(pDecoder, dwInputStreamID, pSample, dwFlags);
if (FAILED(hr)) { /* did not fail */ }
So before the interesting code below I have successfully setup things (I hope) and sent them to ProcessInput which did not fail. I have 1 input stream and 1 output stream, AAC in, PCM out.
Code directly leading to the error
// Input has now been sent to the decoder
// To extract a sample from the decoder we need to create a strucure to hold the output
// First we ask the OutputStream for what type of output sample it will produce and who should allocate it
// Then we create both the sample in question (if we should allocate it that is) and the MFT_OUTPUT_DATA_BUFFER
// which holds the sample and some other information that the decoder will fill in.
#define SAMPLES_PER_BUFFER 1 // hardcoded here, should depend on GetStreamIDs results, which right now is 1
MFT_OUTPUT_DATA_BUFFER pOutputSamples[SAMPLES_PER_BUFFER];
DWORD *pdwStatus = NULL;
// There are different allocation models, find out which one is required here.
MFT_OUTPUT_STREAM_INFO streamInfo = { 0,0,0 };
MFT_OUTPUT_STREAM_INFO *pStreamInfo = &streamInfo;
hr = pDecoder->lpVtbl->GetOutputStreamInfo(pDecoder, dwOutputStreamID, pStreamInfo);
if (FAILED(hr)) { ... }
if (pStreamInfo->dwFlags == MFT_OUTPUT_STREAM_PROVIDES_SAMPLES) { ... }
else if (pStreamInfo->dwFlags == MFT_OUTPUT_STREAM_CAN_PROVIDE_SAMPLES) { ... }
else {
// default, the client must allocate the output samples for the stream
IMFSample *pOutSample = NULL;
DWORD minimumSizeOfBuffer = pStreamInfo->cbSize;
IMFMediaBuffer *pBuffer = NULL;
// CreateMediaSample is explained further down.
hr = CreateMediaSample(minimumSizeOfBuffer, sampleDuration, &pBuffer, &pOutSample);
if (FAILED(hr)) {
BGLOG_ERROR("error");
}
pOutputSamples[0].pSample = pOutSample;
}
// since GetStreamIDs return E_NOTIMPL then dwStreamID does not matter
// but its recomended that it is set to the array index, 0 in this case.
// dwOutputStreamID will be 0 when E_NOTIMPL is returned by GetStremIDs
pOutputSamples[0].dwStreamID = dwOutputStreamID; // = 0
pOutputSamples[0].dwStatus = 0;
pOutputSamples[0].pEvents = NULL; // have tried init this myself, but MFT_OUTPUT_DATA_BUFFER documentation says not to.
hr = pDecoder->lpVtbl->ProcessOutput(pDecoder, dwFlags, outputStreamCount, pOutputSamples, pdwStatus);
if (FAILED(hr)) {
// here E_INVALIDARG is found.
}
CreateMediaSample that is used in the code is derived from an example from the official documentation but modified to call SetSampleDuration and SetSampleTime. I get the same error by not setting those two though so it should be something else causing the problem.
Some of the actual data that was sent to ProcessOutput
In case I might have missed something which is easy to see from the actual data:
hr = pDecoder->lpVtbl->ProcessOutput(
pDecoder, // my decoder
dwFlags, // 0
outputStreamCount, // 1 (from GetStreamCount)
pOutputSamples, // se comment below
pdwStatus // NULL
);
// pOutputSamples[0] holds this struct:
// dwStreamID = 0,
// pSample = SampleDefinedBelow
// dwStatus = 0,
// pEvents = NULL
// SampleDefinedBelow:
// time = 0
// duration = 0.9523..
// buffer = with max length set correctly
// attributes[] = NULL
Question
So anyone have any ideas on what I am doing wrong or how I could debug this further?
ProcessOutput needs a valid pointer as the last argument, so this does not work:
DWORD *pdwStatus = NULL;
pDecoder->lpVtbl->ProcessOutput(..., pdwStatus);
This is okay:
DWORD dwStatus;
pDecoder->lpVtbl->ProcessOutput(..., &dwStatus);
Regarding further E_FAIL - your findings above, in general, looks good. It is not that I see something obvious, and also the error code does not suggest that the problem is with MFT data flow. Perhaps it could be bad data or data not matching media types set.
I'm trying to listen to touch events (TOUCH_BEGIN, TOUCH_UPDATE, TOUCH_END and TOUCH_OWNERSHIP) on the root window.
Touch events aren't directly integrated into XCB, so I have to use the input extension (libxcb-xinput).
I already managed to set up an event listener for events coming from the input extension, but I can't figure out how to register what events I want to listen to.
I tried using xcb_input_xi_select_events(), however that function takes a parameter of type xcb_input_event_mask_t, while the enum containing the event masks is of type xcb_input_xi_event_mask_t and there is no obvious way to cast them.
For that reason I think that xcb_input_xi_select_events() is the wrong function, but I have no idea what function to use instead.
My non working code currently looks like that:
xcb_input_event_mask_t mask[] = {
XCB_INPUT_XI_EVENT_MASK_TOUCH_BEGIN
| XCB_INPUT_XI_EVENT_MASK_TOUCH_END
| XCB_INPUT_XI_EVENT_MASK_TOUCH_UPDATE
| XCB_INPUT_XI_EVENT_MASK_TOUCH_OWNERSHIP
};
xcb_input_xi_select_events(dpy, root, 4, mask);
The core throws a "large integer implicitly truncated to unsigned type" warning at compile time and just a "Failed request: (null), (null): 0x000000D5" error at runtime.
(I'm pretty new to C and especially XCB, so please forgive any obvious errors)
You need to use xcb_input_event_mask_t and xcb_input_xi_event_mask_t together, in the following way:
struct {
xcb_input_event_mask_t head; // describes the subsequent xcb_input_xi_event_mask_t (or an array thereof)
xcb_input_xi_event_mask_t mask;
} mask;
mask.head.deviceid = XCB_INPUT_DEVICE_ALL;
mask.head.mask_len = sizeof(mask.mask) / sizeof(uint32_t);
mask.mask = XCB_INPUT_XI_EVENT_MASK_TOUCH_BEGIN
| XCB_INPUT_XI_EVENT_MASK_TOUCH_END
| XCB_INPUT_XI_EVENT_MASK_TOUCH_UPDATE
| XCB_INPUT_XI_EVENT_MASK_TOUCH_OWNERSHIP;
xcb_input_xi_select_events(dpy, root, 1, &mask.head);
Disclaimer: I have never used this. I have found one single usage example on the 'net here. I tried to verify this usage against the source of xcb_input_xi_select_events here but its code is expletive deleted unreadable. I have not a slightest idea how exactly people should be able to use this library.
I found a solution to this.
Big thanks to https://github.com/eemikula/touchwm.
const uint32_t mask[] = {
XCB_INPUT_XI_EVENT_MASK_TOUCH_BEGIN
| XCB_INPUT_XI_EVENT_MASK_TOUCH_UPDATE
| XCB_INPUT_XI_EVENT_MASK_TOUCH_END
| XCB_INPUT_XI_EVENT_MASK_TOUCH_OWNERSHIP
};
const uint32_t modifiers[] = {XCB_INPUT_MODIFIER_MASK_ANY};
xcb_input_xi_passive_grab_device(
dpy,
XCB_CURRENT_TIME,
root,
XCB_CURSOR_NONE,
0, // detail - as used by XIPassiveGrab
XCB_INPUT_DEVICE_ALL_MASTER,
1, // num_modifiers
1, // mask_len
XCB_INPUT_GRAB_TYPE_TOUCH_BEGIN,
XCB_INPUT_GRAB_MODE_22_TOUCH,
XCB_INPUT_GRAB_MODE_22_ASYNC,
XCB_INPUT_GRAB_OWNER_NO_OWNER,
mask,
modifiers
);
It looks a bit cryptic, but it works.
I'm trying to record sound using Audio Queue, but every time I want to write to file I get the message AudioFileCreateWithURL failed('wht?'). I haven't been able to find a corresponding solution to this error, for I haven't found a similar (wht?) error elsewhere. I acquired the code from Apple's official guide for Audio Queue programming and it looks like this:
char* filePath = "Users/linus/voicies/output.wav";
CFURLRef myFileURL = CFURLCreateFromFileSystemRepresentation( // 1
NULL, // 2
(const UInt8 *) filePath, // 3
strlen (filePath), // 4
false // 5
);
OSStatus err = AudioFileCreateWithURL(
myFileURL,
kAudioFileWAVEType,
&recordFormat,
kAudioFileFlags_EraseFile,
&recorder.recordFile
);
CheckError(err);
in which CheckError finds the corresponding error, which is (wht?). I have no idea what that means and what I must do to make it happen, since the code I have used is almost identical to the sample codes. I appreciate any kind of clue.
I am relatively new to working with threads in Win32 api and have reached a problem that i am unable to work out.
Heres my problem, i have 4 threads (they work as intended) that allow the operator to test 4 terminals. In each thread i am trying to send a message to the main windows form with either Pass or Fail, this is placed within a listbox. Below is one of the threads, the remaining are exactly the same.
void Thread1(PVOID pvoid)
{
for(int i=0;i<numberOfTests1;i++) {
int ret;
double TimeOut = 60.0;
int Lng = 1;
test1[i].testNumber = getTestNumber(test1[i].testName);
unsigned char Param[255] = {0};
unsigned char Port1 = port1;
ret = PSB30_Open(Port1, 16);
ret = PSB30_SendOrder (Port1, test1[i].testNumber, &Param[0], &Lng, &TimeOut);
ret = PSB30_Close (Port1);
if(*Param == 1) SendDlgItemMessage(hWnd,IDT_RESULTLIST1,LB_ADDSTRING,i,(LPARAM)"PASS");
else SendDlgItemMessage(hWnd,IDT_RESULTLIST1,LB_ADDSTRING,i,(LPARAM)"FAIL");
}
_endthread();
}
I have debugged the code and it does everything except populate the listbox, i assume because its a thread i am missing something as the same code works outwith the thread. Do i need to put the thread to sleep while it sends the message to the main window?
Any help is appreciated.
Cheers
You don't want your secondary threads trying to manipulate your UI elements directly (such as the SendDlgItemMessage). Instead, you normally want to post something like a WM_COMMAND or WM_USER+N to the main window, and let that manipulate the UI elements accordingly.
BASS_StreamCreateFile(path,offset,length,BassFlags) always returns '0'. I am not understanding how to use this function. Need help on the usage of BassFlags.
PS : Using this with the help of WPF Sound Visualization Library.
Since 0 only informs you that there's an error, you should check what kind of error it is:
int BASS_ErrorGetCode();
This gives you the errorcode for the recent error.
Here's the list of possible error codes (= return values):
BASS_ERROR_INIT // BASS_Init has not been successfully called.
BASS_ERROR_NOTAVAIL // Only decoding channels (BASS_STREAM_DECODE) are allowed when using the "no sound" device. The BASS_STREAM_AUTOFREE // flag is also unavailable to decoding channels.
BASS_ERROR_ILLPARAM // The length must be specified when streaming from memory.
BASS_ERROR_FILEOPEN // The file could not be opened.
BASS_ERROR_FILEFORM // The file's format is not recognised/supported.
BASS_ERROR_CODEC // The file uses a codec that is not available/supported. This can apply to WAV and AIFF files, and also MP3 files when using the "MP3-free" BASS version.
BASS_ERROR_FORMAT // The sample format is not supported by the device/drivers. If the stream is more than stereo or the BASS_SAMPLE_FLOAT flag is used, it could be that they are not supported.
BASS_ERROR_SPEAKER // The specified SPEAKER flags are invalid. The device/drivers do not support them, they are attempting to assign a stereo stream to a mono speaker or 3D functionality is enabled.
BASS_ERROR_MEM // There is insufficient memory.
BASS_ERROR_NO3D // Could not initialize 3D support.
BASS_ERROR_UNKNOWN // Some other mystery problem!
(from bass.h)
Also make shure you have initialised BASS properly - BASS_Init() must get called before you create a stream:
BOOL BASS_Init(
int device, // The device to use... -1 = default device, 0 = no sound, 1 = first real output device
DWORD freq, // Output sample rate
DWORD flags, // A combination of flags
HWND win, // The application's main window... 0 = the current foreground window (use this for console applications)
GUID *clsid // Class identifier of the object to create, that will be used to initialize DirectSound... NULL = use default
);
Example:
int device = -1; // Default device
int freq = 44100; // Sample rate
BASS_Init(device, freq, 0, 0, NULL); // Init BASS