Messages

1

Audio / Re: OpenAL unhandled exception after trying to play some sound

« on: February 19, 2017, 06:42:37 pm »

Ah my apologies, I figured out the problem and successfully fixed it. Turns out I shouldn't really be freeing musicData inside the onGetData function (the docs say I should do it *after* it's called, my bad).

2

Audio / OpenAL unhandled exception after trying to play some sound

« on: February 19, 2017, 06:10:36 pm »

Hello.

So I've tried to make my own custom soundbuffer class, but I'm having trouble playing the audio I send to it. The program seems to work fine, the onGetData function and returns with no errors, but after a tiny bit I get an error:

Unhandled exception at 0x0F8E78E6 (openal32.dll) in cbsp-vs.exe: 0xC0000005: Access violation reading location 0x0B7DC040.

I'm running on Windows 10, Visual Studio 2015 and am using SFML 2.4.2 (Visual C++ 14 (2015) - 32-bit version from the website).

This is the code I've used in my MusicPlayer (custom audiostream) class:

void MusicPlayer::StartTrack(string track, int loopstart, int looplength) //loads music track data and initializes stream
{
        curSample = 0;
        loopStart = loopstart;
        loopLength = looplength;
        trackName = track;
        sf::Int16* musicData = (sf::Int16*)BDP::ReadBDP(trackName, 0, 44); //load only the header
        sampleCount = BitConv::FromInt32((uint8_t*)musicData, 40) / 2; //WARNING: Samples MUST be 16-bit!
        short int channelCount = BitConv::FromInt16((uint8_t*)musicData, 22);
        int sampleRate = BitConv::FromInt32((uint8_t*)musicData, 24);
        initialize(channelCount, sampleRate);
        free(musicData);
}

bool MusicPlayer::onGetData(Chunk& data)
{
        sf::Int16* musicData;
        if (curSample + BUFFER_LENGTH / 2 >= sampleCount)
        {  //only add to buffer the remaining samples
                int remainSamples = sampleCount - curSample;
                musicData = (sf::Int16*)BDP::ReadBDP(trackName, 44 + curSample * 2, remainSamples * 2);
                data.samples = (sf::Int16*)musicData;
                data.sampleCount = remainSamples;
                curSample = loopStart;
        }
        else
        {  //add to buffer all available samples
                musicData = (sf::Int16*)BDP::ReadBDP(trackName, 44 + curSample * 2, BUFFER_LENGTH);
                data.samples = (sf::Int16*)musicData;
                data.sampleCount = BUFFER_LENGTH / 2;
                curSample += BUFFER_LENGTH / 2;
        }
        free(musicData);
        return true;
}

And this is the code that I'm using to play it:

                                musicPlayer.StartTrack("snd/mus/menu.wav", 276706, 3251294);
                                musicPlayer.play();

(unsurprisingly it's just those 2 lines)

Thank you for your help.

EDIT: The ReadBDP function just reads a file (which is inside a bigger file) and it works perfectly, so pretend that I'm just reading a file (or part of it since I can specify offset and size to read from the file, which I did here in order to just read the sample data from a WAV).