auhal.c

uclinux 下的vlc播放器源代码

        
        /* Initialize the VLC core channel count */
        p_aout->output.output.i_physical_channels = 0;
        i_original = p_aout->output.output.i_original_channels & AOUT_CHAN_PHYSMASK;
        
        if( i_original == AOUT_CHAN_CENTER || layout->mNumberChannelDescriptions < 2 )
        {
            /* We only need Mono or cannot output more than 1 channel */
            p_aout->output.output.i_physical_channels = AOUT_CHAN_CENTER;
        }
        else if( i_original == (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT) || layout->mNumberChannelDescriptions < 3 )
        {
            /* We only need Stereo or cannot output more than 2 channels */
            p_aout->output.output.i_physical_channels = AOUT_CHAN_RIGHT | AOUT_CHAN_LEFT;
        }
        else
        {
            /* We want more than stereo and we can do that */
            for( i = 0; i < layout->mNumberChannelDescriptions; i++ )
            {
                msg_Dbg( p_aout, "this is channel: %d", (int)layout->mChannelDescriptions[i].mChannelLabel );

                switch( layout->mChannelDescriptions[i].mChannelLabel )
                {
                    case kAudioChannelLabel_Left:
                        p_aout->output.output.i_physical_channels |= AOUT_CHAN_LEFT;
                        continue;
                    case kAudioChannelLabel_Right:
                        p_aout->output.output.i_physical_channels |= AOUT_CHAN_RIGHT;
                        continue;
                    case kAudioChannelLabel_Center:
                        p_aout->output.output.i_physical_channels |= AOUT_CHAN_CENTER;
                        continue;
                    case kAudioChannelLabel_LFEScreen:
                        p_aout->output.output.i_physical_channels |= AOUT_CHAN_LFE;
                        continue;
                    case kAudioChannelLabel_LeftSurround:
                        p_aout->output.output.i_physical_channels |= AOUT_CHAN_REARLEFT;
                        continue;
                    case kAudioChannelLabel_RightSurround:
                        p_aout->output.output.i_physical_channels |= AOUT_CHAN_REARRIGHT;
                        continue;
                    case kAudioChannelLabel_RearSurroundLeft:
                        p_aout->output.output.i_physical_channels |= AOUT_CHAN_MIDDLELEFT;
                        continue;
                    case kAudioChannelLabel_RearSurroundRight:
                        p_aout->output.output.i_physical_channels |= AOUT_CHAN_MIDDLERIGHT;
                        continue;
                    case kAudioChannelLabel_CenterSurround:
                        p_aout->output.output.i_physical_channels |= AOUT_CHAN_REARCENTER;
                        continue;
                    default:
                        msg_Warn( p_aout, "unrecognized channel form provided by driver: %d", (int)layout->mChannelDescriptions[i].mChannelLabel );
                }
            }
            if( p_aout->output.output.i_physical_channels == 0 )
            {
                p_aout->output.output.i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
                msg_Err( p_aout, "You should configure your speaker layout with Audio Midi Setup Utility in /Applications/Utilities. Now using Stereo mode." );
            }
        }
        if( layout ) free( layout );
    }
    else
    {
        msg_Warn( p_aout, "this driver does not support kAudioDevicePropertyPreferredChannelLayout. BAD DRIVER AUTHOR !!!" );
        p_aout->output.output.i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
    }

    msg_Dbg( p_aout, "selected %d physical channels for device output", aout_FormatNbChannels( &p_aout->output.output ) );
    msg_Dbg( p_aout, "VLC will output: %s", aout_FormatPrintChannels( &p_aout->output.output ));

    memset (&new_layout, 0, sizeof(new_layout));
    switch( aout_FormatNbChannels( &p_aout->output.output ) )
    {
        case 1:
            new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_Mono;
            break;
        case 2:
            new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_Stereo;
            break;
        case 3:
            if( p_aout->output.output.i_physical_channels & AOUT_CHAN_CENTER )
            {
                new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_DVD_7; // L R C
            }
            else if( p_aout->output.output.i_physical_channels & AOUT_CHAN_LFE )
            {
                new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_DVD_4; // L R LFE
            }
            break;
        case 4:
            if( p_aout->output.output.i_physical_channels & ( AOUT_CHAN_CENTER | AOUT_CHAN_LFE ) )
            {
                new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_DVD_10; // L R C LFE
            }
            else if( p_aout->output.output.i_physical_channels & ( AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT ) )
            {
                new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_DVD_3; // L R Ls Rs
            }
            else if( p_aout->output.output.i_physical_channels & ( AOUT_CHAN_CENTER | AOUT_CHAN_REARCENTER ) )
            {
                new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_DVD_3; // L R C Cs
            }
            break;
        case 5:
            if( p_aout->output.output.i_physical_channels & ( AOUT_CHAN_CENTER ) )
            {
                new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_DVD_19; // L R Ls Rs C
            }
            else if( p_aout->output.output.i_physical_channels & ( AOUT_CHAN_LFE ) )
            {
                new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_DVD_18; // L R Ls Rs LFE
            }
            break;
        case 6:
            if( p_aout->output.output.i_physical_channels & ( AOUT_CHAN_LFE ) )
            {
                new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_DVD_20; // L R Ls Rs C LFE
            }
            else
            {
                new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_AudioUnit_6_0; // L R Ls Rs C Cs
            }
            break;
        case 7:
            /* FIXME: This is incorrect. VLC uses the internal ordering: L R Lm Rm Lr Rr C LFE but this is wrong */
            new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_MPEG_6_1_A; // L R C LFE Ls Rs Cs
            break;
        case 8:
            /* FIXME: This is incorrect. VLC uses the internal ordering: L R Lm Rm Lr Rr C LFE but this is wrong */
            new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_MPEG_7_1_A; // L R C LFE Ls Rs Lc Rc
            break;
    }

    /* Set up the format to be used */
    DeviceFormat.mSampleRate = p_aout->output.output.i_rate;
    DeviceFormat.mFormatID = kAudioFormatLinearPCM;

    /* We use float 32. It's the best supported format by both VLC and Coreaudio */
    p_aout->output.output.i_format = VLC_FOURCC( 'f','l','3','2');
    DeviceFormat.mFormatFlags = kAudioFormatFlagsNativeFloatPacked;
    DeviceFormat.mBitsPerChannel = 32;
    DeviceFormat.mChannelsPerFrame = aout_FormatNbChannels( &p_aout->output.output );
    
    /* Calculate framesizes and stuff */
    DeviceFormat.mFramesPerPacket = 1;
    DeviceFormat.mBytesPerFrame = DeviceFormat.mBitsPerChannel * DeviceFormat.mChannelsPerFrame / 8;
    DeviceFormat.mBytesPerPacket = DeviceFormat.mBytesPerFrame * DeviceFormat.mFramesPerPacket;
 
    /* Set the desired format */
    i_param_size = sizeof(AudioStreamBasicDescription);
    verify_noerr( AudioUnitSetProperty( p_sys->au_unit,
                                   kAudioUnitProperty_StreamFormat,
                                   kAudioUnitScope_Input,
                                   0,
                                   &DeviceFormat,
                                   i_param_size ));
                                   
    msg_Dbg( p_aout, STREAM_FORMAT_MSG( "we set the AU format: " , DeviceFormat ) );
    
    /* Retrieve actual format */
    verify_noerr( AudioUnitGetProperty( p_sys->au_unit,
                                   kAudioUnitProperty_StreamFormat,
                                   kAudioUnitScope_Input,
                                   0,
                                   &DeviceFormat,
                                   &i_param_size ));
                                   
    msg_Dbg( p_aout, STREAM_FORMAT_MSG( "the actual set AU format is " , DeviceFormat ) );

    /* Do the last VLC aout setups */
    aout_FormatPrepare( &p_aout->output.output );
    p_aout->output.i_nb_samples = 2048;
    aout_VolumeSoftInit( p_aout );

    /* set the IOproc callback */
    input.inputProc = (AURenderCallback) RenderCallbackAnalog;
    input.inputProcRefCon = p_aout;
    
    verify_noerr( AudioUnitSetProperty( p_sys->au_unit,
                            kAudioUnitProperty_SetRenderCallback,
                            kAudioUnitScope_Input,
                            0, &input, sizeof( input ) ) );

    input.inputProc = (AURenderCallback) RenderCallbackAnalog;
    input.inputProcRefCon = p_aout;
    
    /* Set the new_layout as the layout VLC will use to feed the AU unit */
    verify_noerr( AudioUnitSetProperty( p_sys->au_unit,
                            kAudioUnitProperty_AudioChannelLayout,
                            kAudioUnitScope_Input,
                            0, &new_layout, sizeof(new_layout) ) );
                            
    if( new_layout.mNumberChannelDescriptions > 0 )
        free( new_layout.mChannelDescriptions );
    
    /* AU initiliaze */
    verify_noerr( AudioUnitInitialize(p_sys->au_unit) );

    /* Find the difference between device clock and mdate clock */
    p_sys->clock_diff = - (mtime_t)
        AudioConvertHostTimeToNanos( AudioGetCurrentHostTime() ) / 1000; 
    p_sys->clock_diff += mdate();

    /* Start the AU */
    verify_noerr( AudioOutputUnitStart(p_sys->au_unit) );
    
    return VLC_TRUE;
}

/*****************************************************************************
 * Setup a encoded digital stream (SPDIF)
 *****************************************************************************/
static int OpenSPDIF( aout_instance_t * p_aout )
{
    struct aout_sys_t       *p_sys = p_aout->output.p_sys;
    OSStatus                err = noErr;
    UInt32                  i_param_size = 0, b_mix = 0;
    Boolean                 b_writeable = VLC_FALSE;
    AudioStreamID           *p_streams = NULL;
    int                     i = 0, i_streams = 0;

    /* Start doing the SPDIF setup proces */
    p_sys->b_digital = VLC_TRUE;

    /* Hog the device */
    i_param_size = sizeof( p_sys->i_hog_pid );
    p_sys->i_hog_pid = getpid() ;
    
    err = AudioDeviceSetProperty( p_sys->i_selected_dev, 0, 0, FALSE,
                                  kAudioDevicePropertyHogMode, i_param_size, &p_sys->i_hog_pid );
    
    if( err != noErr )
    {
        msg_Err( p_aout, "failed to set hogmode: [%4.4s]", (char *)&err );
        return VLC_FALSE;
    }

    /* Set mixable to false if we are allowed to */
    err = AudioDeviceGetPropertyInfo( p_sys->i_selected_dev, 0, FALSE, kAudioDevicePropertySupportsMixing,
                                    &i_param_size, &b_writeable );

    err = AudioDeviceGetProperty( p_sys->i_selected_dev, 0, FALSE, kAudioDevicePropertySupportsMixing,
                                    &i_param_size, &b_mix );
                                    
    if( !err && b_writeable )
    {
        b_mix = 0;
        err = AudioDeviceSetProperty( p_sys->i_selected_dev, 0, 0, FALSE,
                            kAudioDevicePropertySupportsMixing, i_param_size, &b_mix );
        p_sys->b_changed_mixing = VLC_TRUE;
    }
    
    if( err != noErr )
    {
        msg_Err( p_aout, "failed to set mixmode: [%4.4s]", (char *)&err );
        return VLC_FALSE;
    }

    /* Get a list of all the streams on this device */
    err = AudioDeviceGetPropertyInfo( p_sys->i_selected_dev, 0, FALSE,
                                      kAudioDevicePropertyStreams,
                                      &i_param_size, NULL );
    if( err != noErr )
    {
        msg_Err( p_aout, "could not get number of streams: [%4.4s]", (char *)&err );
        return VLC_FALSE;
    }
    
    i_streams = i_param_size / sizeof( AudioStreamID );
    p_streams = (AudioStreamID *)malloc( i_param_size );
    if( p_streams == NULL )
    {
        msg_Err( p_aout, "out of memory" );
        return VLC_FALSE;
    }
    
    err = AudioDeviceGetProperty( p_sys->i_selected_dev, 0, FALSE,
                                    kAudioDevicePropertyStreams,
                                    &i_param_size, p_streams );
    
    if( err != noErr )
    {
        msg_Err( p_aout, "could not get number of streams: [%4.4s]", (char *)&err );
        if( p_streams ) free( p_streams );
        return VLC_FALSE;
    }

    for( i = 0; i < i_streams && p_sys->i_stream_index < 0 ; i++ )
    {
        /* Find a stream with a cac3 stream */
        AudioStreamBasicDescription *p_format_list = NULL;
        int                         i_formats = 0, j = 0;
        vlc_bool_t                  b_digital = VLC_FALSE;
        
        /* Retrieve all the stream formats supported by each output stream */
        err = AudioStreamGetPropertyInfo( p_streams[i], 0,
                                          kAudioStreamPropertyPhysicalFormats,
                                          &i_param_size, NULL );
        if( err != noErr )
        {
            msg_Err( p_aout, "could not get number of streamformats: [%4.4s]", (char *)&err );
            continue;
        }
        
        i_formats = i_param_size / sizeof( AudioStreamBasicDescription );
        p_format_list = (AudioStreamBasicDescription *)malloc( i_param_size );
        if( p_format_list == NULL )
        {
            msg_Err( p_aout, "could not malloc the memory" );
            continue;
        }
        
        err = AudioStreamGetProperty( p_streams[i], 0,
                                          kAudioStreamPropertyPhysicalFormats,
                                          &i_param_size, p_format_list );
        if( err != noErr )
        {
            msg_Err( p_aout, "could not get the list of streamformats: [%4.4s]", (char *)&err );
            if( p_format_list) free( p_format_list);
            continue;
        }

        /* Check if one of the supported formats is a digital format */
        for( j = 0; j < i_formats; j++ )
        {
            if( p_format_list[j].mFormatID == 'IAC3' ||
                  p_format_list[j].mFormatID == kAudioFormat60958AC3 )
            {
                b_digital = VLC_TRUE;
                break;
            }
        }
        
        if( b_digital )
        {
            /* if this stream supports a digital (cac3) format, then go set it. */
            int i_requested_rate_format = -1;
            int i_current_rate_format = -1;
            int i_backup_rate_format = -1;

            p_sys->i_stream_id = p_streams[i];
            p_sys->i_stream_index = i;

            if( p_sys->b_revert == VLC_FALSE )
            {
                /* Retrieve the original format of this stream first if not done so already */
                i_param_size = sizeof( p_sys->sfmt_revert );
                err = AudioStreamGetProperty( p_sys->i_stream_id, 0,
                                              kAudioStreamPropertyPhysicalFormat,
                                              &i_param_size, 
                                              &p_sys->sfmt_revert );
                if( err != noErr )
                {
                    msg_Err( p_aout, "could not retrieve the original streamformat: [%4.4s]", (char *)&err );
                    continue; 
                }
                p_sys->b_revert = VLC_TRUE;
            }

            for( j = 0; j < i_formats; j++ )
            {
                if( p_format_list[j].mFormatID == 'IAC3' ||
                      p_format_list[j].mFormatID == kAudioFormat60958AC3 )