<![CDATA[VBA-M Forums - Audio]]> http://vba-m.com/forum/ Fri, 10 Sep 2010 20:16:10 +0000 MyBB <![CDATA[Request: Remove OpenAL support from Windows build]]> http://vba-m.com/forum/showthread.php?tid=387 Sun, 16 Aug 2009 14:38:41 +0000 http://vba-m.com/forum/showthread.php?tid=387
  • Make exe smaller
  • One less SDK for developers to download and install
  • Native support only by a few sound cards (I know of Creative and NVIDIA)
  • Windows SDK maintained by Creative Tech.
  • Official documentation too lean
  • XAudio2 works as well

    • Contra:
    • Less diversity


    I would still keep the source file in the SVN repo so some Linux guy can modify it a little and use it for the Linux build if he wishes, but I think it would be a good idea to remove it from the windows build.]]>
  • Make exe smaller
  • One less SDK for developers to download and install
  • Native support only by a few sound cards (I know of Creative and NVIDIA)
  • Windows SDK maintained by Creative Tech.
  • Official documentation too lean
  • XAudio2 works as well

    • Contra:
    • Less diversity


    I would still keep the source file in the SVN repo so some Linux guy can modify it a little and use it for the Linux build if he wishes, but I think it would be a good idea to remove it from the windows build.]]>         <![CDATA[XAudio2 upmixing matrices]]> http://vba-m.com/forum/showthread.php?tid=171 Mon, 14 Jul 2008 17:45:00 +0000 http://vba-m.com/forum/showthread.php?tid=171
    I took this inof sheet as a reference:
    http://ac3filter.net/guides/mixing_matrix

    And this for the speaker order:
    http://msdn.microsoft.com/en-us/library/bb694506.aspx


    Here are my matrices. Since I entered them by hand, it would be good if everyone who is into that stuff could tell me if they're good.
    Is it OK if I leave the LFE always at 0 since it would receive frequencies higher than for ex. 120Hz?
    I can still hear my LFE because my sound driver uses a crossover frequency to get the subwoofer signal from the low-freq part of the other channels.

    PHP Code:
    #ifdef STEREO_UPMIXING
        // set up stereo upmixing
            XAUDIO2_DEVICE_DETAILS dd;
            ZeroMemory( &dd, sizeof( dd ) );
            hr = xaud->GetDeviceDetails( 0, &dd );
            ASSERT( hr == S_OK );
            float *matrix = NULL;
            matrix = (float*)malloc( sizeof( float ) * 2 * dd.OutputFormat.Format.nChannels );
        switch(     dd.OutputFormat.Format.nChannels ) {
            case     4: // 4.0
    //Speaker \ Left Source           Right Source
    /*Front L*/        matrix[0] = 1.0000f;  matrix[1] = 0.0000f;
    /*Front R*/    matrix[2] = 0.0000f;  matrix[3] = 1.0000f;
    /*Back  L*/    matrix[4] = 1.0000f;  matrix[5] = 0.0000f;
    /*Back  R*/    matrix[6] = 0.0000f;  matrix[7] = 1.0000f;
                break;
            case     5: // 5.0
    //Speaker \ Left Source           Right Source
    /*Front L*/        matrix[0] = 1.0000f;  matrix[1] = 0.0000f;
    /*Front R*/    matrix[2] = 0.0000f;  matrix[3] = 1.0000f;
    /*Front C*/    matrix[4] = 0.7071f;  matrix[5] = 0.7071f;
    /*Side  L*/    matrix[6] = 1.0000f;  matrix[7] = 0.0000f;
    /*Side  R*/    matrix[8] = 0.0000f;  matrix[9] = 1.0000f;
                break;
            case     6: // 5.1
    //Speaker \ Left Source           Right Source
    /*Front L*/        matrix[0] = 1.0000f;  matrix[1] = 0.0000f;
    /*Front R*/    matrix[2] = 0.0000f;  matrix[3] = 1.0000f;
    /*Front C*/    matrix[4] = 0.7071f;  matrix[5] = 0.7071f;
    /*LFE    */    matrix[6] = 0.0000f;  matrix[7] = 0.0000f;
    /*Side  L*/    matrix[8] = 1.0000f;  matrix[9] = 0.0000f;
    /*Side  R*/    matrix[10] = 0.0000f;  matrix[11] = 1.0000f;
                break;
            case     7: // 6.1
    //Speaker \ Left Source           Right Source
    /*Front L*/        matrix[0] = 1.0000f;  matrix[1] = 0.0000f;
    /*Front R*/    matrix[2] = 0.0000f;  matrix[3] = 1.0000f;
    /*Front C*/    matrix[4] = 0.7071f;  matrix[5] = 0.7071f;
    /*LFE    */    matrix[6] = 0.0000f;  matrix[7] = 0.0000f;
    /*Side  L*/    matrix[8] = 1.0000f;  matrix[9] = 0.0000f;
    /*Side  R*/    matrix[10] = 0.0000f;  matrix[11] = 1.0000f;
    /*Back  C*/    matrix[12] = 0.7071f;  matrix[13] = 0.7071f;
                break;
            case     8: // 7.1
    //Speaker \ Left Source           Right Source
    /*Front L*/        matrix[0] = 1.0000f;  matrix[1] = 0.0000f;
    /*Front R*/    matrix[2] = 0.0000f;  matrix[3] = 1.0000f;
    /*Front C*/    matrix[4] = 0.7071f;  matrix[5] = 0.7071f;
    /*LFE    */    matrix[6] = 0.0000f;  matrix[7] = 0.0000f;
    /*Back  L*/    matrix[8] = 1.0000f;  matrix[9] = 0.0000f;
    /*Back  R*/    matrix[10] = 0.0000f;  matrix[11] = 1.0000f;
    /*Side  L*/    matrix[12] = 1.0000f;  matrix[13] = 0.0000f;
    /*Side  R*/    matrix[14] = 0.0000f;  matrix[15] = 1.0000f;
                break;
        }
            hr = sVoice->SetOutputMatrix( NULL, 2, dd.OutputFormat.Format.nChannels, matrix );
            ASSERT( hr == S_OK );
            free( matrix );
            matrix = NULL;
    #endif 
    ]]>
    I took this inof sheet as a reference:
    http://ac3filter.net/guides/mixing_matrix

    And this for the speaker order:
    http://msdn.microsoft.com/en-us/library/bb694506.aspx


    Here are my matrices. Since I entered them by hand, it would be good if everyone who is into that stuff could tell me if they're good.
    Is it OK if I leave the LFE always at 0 since it would receive frequencies higher than for ex. 120Hz?
    I can still hear my LFE because my sound driver uses a crossover frequency to get the subwoofer signal from the low-freq part of the other channels.

    PHP Code:
    #ifdef STEREO_UPMIXING
        // set up stereo upmixing
            XAUDIO2_DEVICE_DETAILS dd;
            ZeroMemory( &dd, sizeof( dd ) );
            hr = xaud->GetDeviceDetails( 0, &dd );
            ASSERT( hr == S_OK );
            float *matrix = NULL;
            matrix = (float*)malloc( sizeof( float ) * 2 * dd.OutputFormat.Format.nChannels );
        switch(     dd.OutputFormat.Format.nChannels ) {
            case     4: // 4.0
    //Speaker \ Left Source           Right Source
    /*Front L*/        matrix[0] = 1.0000f;  matrix[1] = 0.0000f;
    /*Front R*/    matrix[2] = 0.0000f;  matrix[3] = 1.0000f;
    /*Back  L*/    matrix[4] = 1.0000f;  matrix[5] = 0.0000f;
    /*Back  R*/    matrix[6] = 0.0000f;  matrix[7] = 1.0000f;
                break;
            case     5: // 5.0
    //Speaker \ Left Source           Right Source
    /*Front L*/        matrix[0] = 1.0000f;  matrix[1] = 0.0000f;
    /*Front R*/    matrix[2] = 0.0000f;  matrix[3] = 1.0000f;
    /*Front C*/    matrix[4] = 0.7071f;  matrix[5] = 0.7071f;
    /*Side  L*/    matrix[6] = 1.0000f;  matrix[7] = 0.0000f;
    /*Side  R*/    matrix[8] = 0.0000f;  matrix[9] = 1.0000f;
                break;
            case     6: // 5.1
    //Speaker \ Left Source           Right Source
    /*Front L*/        matrix[0] = 1.0000f;  matrix[1] = 0.0000f;
    /*Front R*/    matrix[2] = 0.0000f;  matrix[3] = 1.0000f;
    /*Front C*/    matrix[4] = 0.7071f;  matrix[5] = 0.7071f;
    /*LFE    */    matrix[6] = 0.0000f;  matrix[7] = 0.0000f;
    /*Side  L*/    matrix[8] = 1.0000f;  matrix[9] = 0.0000f;
    /*Side  R*/    matrix[10] = 0.0000f;  matrix[11] = 1.0000f;
                break;
            case     7: // 6.1
    //Speaker \ Left Source           Right Source
    /*Front L*/        matrix[0] = 1.0000f;  matrix[1] = 0.0000f;
    /*Front R*/    matrix[2] = 0.0000f;  matrix[3] = 1.0000f;
    /*Front C*/    matrix[4] = 0.7071f;  matrix[5] = 0.7071f;
    /*LFE    */    matrix[6] = 0.0000f;  matrix[7] = 0.0000f;
    /*Side  L*/    matrix[8] = 1.0000f;  matrix[9] = 0.0000f;
    /*Side  R*/    matrix[10] = 0.0000f;  matrix[11] = 1.0000f;
    /*Back  C*/    matrix[12] = 0.7071f;  matrix[13] = 0.7071f;
                break;
            case     8: // 7.1
    //Speaker \ Left Source           Right Source
    /*Front L*/        matrix[0] = 1.0000f;  matrix[1] = 0.0000f;
    /*Front R*/    matrix[2] = 0.0000f;  matrix[3] = 1.0000f;
    /*Front C*/    matrix[4] = 0.7071f;  matrix[5] = 0.7071f;
    /*LFE    */    matrix[6] = 0.0000f;  matrix[7] = 0.0000f;
    /*Back  L*/    matrix[8] = 1.0000f;  matrix[9] = 0.0000f;
    /*Back  R*/    matrix[10] = 0.0000f;  matrix[11] = 1.0000f;
    /*Side  L*/    matrix[12] = 1.0000f;  matrix[13] = 0.0000f;
    /*Side  R*/    matrix[14] = 0.0000f;  matrix[15] = 1.0000f;
                break;
        }
            hr = sVoice->SetOutputMatrix( NULL, 2, dd.OutputFormat.Format.nChannels, matrix );
            ASSERT( hr == S_OK );
            free( matrix );
            matrix = NULL;
    #endif 
    ]]>         <![CDATA[Current state of the audio plugins]]> http://vba-m.com/forum/showthread.php?tid=55 Wed, 02 Apr 2008 15:22:42 +0000 http://vba-m.com/forum/showthread.php?tid=55
    The OpenAL plugin is also my creation. The API was documented way too short so I had to find out some stuff for myself, but I think it is stable now. While OpenAL works with an incredible buffer size of just 2 frames smoothly with my X-Fi, the Realek OnBoard required a minimum of 5 frames.]]>
    The OpenAL plugin is also my creation. The API was documented way too short so I had to find out some stuff for myself, but I think it is stable now. While OpenAL works with an incredible buffer size of just 2 frames smoothly with my X-Fi, the Realek OnBoard required a minimum of 5 frames.]]>