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Audio / Trouble with sf::Music

« on: August 27, 2015, 01:12:34 pm »

Hello, i write simple game with SFML.
I using sf::Sound and all is ok. If i use sf::Music periodically i get error in console:

(click to show/hide)

...
An internal OpenAL call failed in SoundSource.cpp(177).
Expression:
   alGetSourcei(m_source, AL_SOURCE_STATE, &status)
Error description:
   AL_INVALID_OPERATION
   The specified operation is not allowed in the current state.

An internal OpenAL call failed in SoundStream.cpp(312).
Expression:
   alSourcePlay(m_source)
Error description:
   AL_INVALID_OPERATION
   The specified operation is not allowed in the current state.

An internal OpenAL call failed in SoundStream.cpp(324).
Expression:
   alGetSourcei(m_source, AL_BUFFERS_PROCESSED, &nbProcessed)
Error description:
   AL_INVALID_OPERATION
   The specified operation is not allowed in the current state.

An internal OpenAL call failed in SoundSource.cpp(177).
Expression:
   alGetSourcei(m_source, AL_SOURCE_STATE, &status)
Error description:
   AL_INVALID_OPERATION
   The specified operation is not allowed in the current state.

An internal OpenAL call failed in SoundSource.cpp(177).
Expression:
   alGetSourcei(m_source, AL_SOURCE_STATE, &status)
Error description:
   AL_INVALID_OPERATION
   The specified operation is not allowed in the current state.
...

My code:

(click to show/hide)

musicFiles - array of strings filename
curMusicFile - iterator to array

        void MusicPlayer::playNext()
        {
                if (!musicPlayer->openFromFile(*(curMusicFile++)))
                        throw runtime_error("GameSpace::MusicPlayer::doPlay openFromFile error");

                musicPlayer->play();

                curLength = musicPlayer->getPlayingOffset();
        }
        //////////////////////////////////////////////////////////////////////////
        void MusicPlayer::doPlay(const sf::Time& delta)
        {
                if (!musicFiles.empty())
                {
                        if (!musicPlayer)
                        {
                                curMusicFile = musicFiles.begin();
                               
                                musicPlayer = unique_ptr<Music>(new Music());

                                playNext();
                        }
                        else
                        {
                                curLength += delta;
                                if (curLength >= musicPlayer->getDuration())
                                {
                                        if (curMusicFile == musicFiles.end())
                                                curMusicFile = musicFiles.begin();

                                        musicPlayer->stop();

                                        playNext();
                                }
                        }
                }
        }

in main:

MusicPlayer mp;
mp.addMusic("file.wab");
Clock gameTime;
while (mainWindow.isOpen())
{
        mp.doPlay(gameTime.getElapsedTime());
        doLogic(gameTime.restart().asMicroseconds() / 800.0f);
        ...
}
 

Please, tell me where my mistake. And sorry for my bad english.