auhal.c

video linux conference

    /* Find the ID of the default Device */
    i_param_size = sizeof( AudioDeviceID );
    err = AudioHardwareGetProperty( kAudioHardwarePropertyDefaultOutputDevice,
                                    &i_param_size, (void *)&devid_def );
    if( err != noErr )
    {
        msg_Err( p_aout, "could not get default audio device: [%4.4s]", (char *)&err );
        goto error;
    }
    p_sys->i_default_dev = devid_def;
    
    var_Create( p_aout, "audio-device", VLC_VAR_INTEGER|VLC_VAR_HASCHOICE );
    text.psz_string = _("Audio Device");
    var_Change( p_aout, "audio-device", VLC_VAR_SETTEXT, &text, NULL );
    
    for( i = 0; i < p_sys->i_devices; i++ )
    {
        char psz_devuid[1024];
        char psz_name[1024];
        CFStringRef devUID;

        i_param_size = sizeof psz_name;
        err = AudioDeviceGetProperty(
                    p_devices[i], 0, VLC_FALSE,
                    kAudioDevicePropertyDeviceName,
                    &i_param_size, psz_name);
        if( err )
            goto error;

        i_param_size = sizeof(CFStringRef);    
        err = AudioDeviceGetProperty(
                    p_devices[i], 0, VLC_FALSE,
                    kAudioDevicePropertyDeviceUID,
                    &i_param_size, &devUID);
        if( err )
            goto error;

        CFStringGetCString( devUID, psz_devuid, sizeof psz_devuid, CFStringGetSystemEncoding() );
        msg_Dbg( p_aout, "DevID: %lu  DevName: %s  DevUID: %s", p_devices[i], psz_name, psz_devuid );
        CFRelease( devUID );

        if( !AudioDeviceHasOutput( p_devices[i]) )
        {
            msg_Dbg( p_aout, "this device is INPUT only. skipping..." );
            continue;
        }

        val.i_int = (int) p_devices[i];
        text.psz_string = psz_name;
        var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val, &text );
        if( devid_def == p_devices[i] )
        {
            var_Change( p_aout, "audio-device", VLC_VAR_SETDEFAULT, &val, NULL );
            var_Set( p_aout, "audio-device", val );
        }
    }
    var_AddCallback( p_aout, "audio-device", aout_ChannelsRestart, NULL );
    
    /* attach a Listener so that we are notified of a change in the Device setup */
    /* err = AudioHardwareAddPropertyListener( kAudioHardwarePropertyDevices,
                                            HardwareListener, 
                                            (void *)p_aout );
    if( err )
        goto error;*/
    
    msg_Dbg( p_aout, "succesful finish of deviceslist" );
    if( p_devices ) free( p_devices );
    return (VLC_SUCCESS);

error:
    var_Destroy( p_aout, "audio-device" );
    if( p_devices ) free( p_devices );
    return VLC_EGENERIC;
}

/*****************************************************************************
 * DeviceDigitalMode: Check i_dev_id for digital stream support.
 *****************************************************************************/
static int DeviceDigitalMode( aout_instance_t *p_aout, AudioDeviceID i_dev_id )
{
    OSStatus                    err = noErr;
    UInt32                      i_param_size;
    AudioStreamBasicDescription *p_format_list;
    int                         i, i_formats;
    struct aout_sys_t           *p_sys = p_aout->output.p_sys;
    
    p_sys->b_supports_digital = VLC_FALSE;
    
    err = AudioDeviceGetPropertyInfo( i_dev_id, 0, FALSE,
                                      kAudioDevicePropertyStreamFormats,
                                      &i_param_size, NULL );
    if( err != noErr )
    {
        msg_Err( p_aout, "could not get number of streamsformats: [%4.4s]", (char *)&err );
        return( VLC_EGENERIC );
    }
    
    i_formats = i_param_size / sizeof( AudioStreamBasicDescription );
    p_format_list = (AudioStreamBasicDescription *)malloc( i_param_size );
    if( p_format_list == NULL )
    {
        return( VLC_ENOMEM );
    }
    
    err = AudioDeviceGetProperty( i_dev_id, 0, FALSE,
                                      kAudioDevicePropertyStreamFormats,
                                      &i_param_size, (void *)p_format_list );
    if( err != noErr )
    {
        msg_Err( p_aout, "could not get the list of formats: [%4.4s]", (char *)&err );
        return( VLC_EGENERIC );
    }

    for( i = 0; i < i_formats; i++ )
    {
        msg_Dbg( p_aout, STREAM_FORMAT_MSG( "supported format", p_format_list[i] ) );
        
        if( p_format_list[i].mFormatID == 'IAC3' ||
                  p_format_list[i].mFormatID == kAudioFormat60958AC3 )
        {
            p_sys->b_supports_digital = VLC_TRUE;
            msg_Dbg( p_aout, "this device supports a digital stream" );
            break;
        }
    }
    
    free( (void *)p_format_list );
    return VLC_SUCCESS;
}

/*****************************************************************************
 * RenderCallbackAnalog: This function is called everytime the AudioUnit wants
 * us to provide some more audio data.
 * Don't print anything during normal playback, calling blocking function from
 * this callback is not allowed.
 *****************************************************************************/
static OSStatus RenderCallbackAnalog( vlc_object_t *_p_aout,
                                      AudioUnitRenderActionFlags *ioActionFlags,
                                      const AudioTimeStamp *inTimeStamp,
                                      unsigned int inBusNummer,
                                      unsigned int inNumberFrames,
                                      AudioBufferList *ioData )
{
    AudioTimeStamp  host_time;
    mtime_t         current_date = 0;
    uint32_t        i_mData_bytes = 0;    

    aout_instance_t * p_aout = (aout_instance_t *)_p_aout;
    struct aout_sys_t * p_sys = p_aout->output.p_sys;

    host_time.mFlags = kAudioTimeStampHostTimeValid;
    AudioDeviceTranslateTime( p_sys->i_selected_dev, inTimeStamp, &host_time );

    p_sys->clock_diff = - (mtime_t)
        AudioConvertHostTimeToNanos( AudioGetCurrentHostTime() ) / 1000; 
    p_sys->clock_diff += mdate();

    current_date = p_sys->clock_diff +
                   AudioConvertHostTimeToNanos( host_time.mHostTime ) / 1000;

    if( ioData == NULL && ioData->mNumberBuffers < 1 )
    {
        msg_Err( p_aout, "no iodata or buffers");
        return 0;
    }
    if( ioData->mNumberBuffers > 1 )
        msg_Err( p_aout, "well this is weird. seems like there is more than one buffer..." );


    if( p_sys->i_total_bytes > 0 )
    {
        i_mData_bytes = __MIN( p_sys->i_total_bytes - p_sys->i_read_bytes, ioData->mBuffers[0].mDataByteSize );
        p_aout->p_vlc->pf_memcpy( ioData->mBuffers[0].mData, &p_sys->p_remainder_buffer[p_sys->i_read_bytes], i_mData_bytes );
        p_sys->i_read_bytes += i_mData_bytes;
        current_date += (mtime_t) ( (mtime_t) 1000000 / p_aout->output.output.i_rate ) *
                        ( i_mData_bytes / 4 / aout_FormatNbChannels( &p_aout->output.output )  ); // 4 is fl32 specific
        
        if( p_sys->i_read_bytes >= p_sys->i_total_bytes )
            p_sys->i_read_bytes = p_sys->i_total_bytes = 0;
    }
    
    while( i_mData_bytes < ioData->mBuffers[0].mDataByteSize )
    {
        /* We don't have enough data yet */
        aout_buffer_t * p_buffer;
        p_buffer = aout_OutputNextBuffer( p_aout, current_date , VLC_FALSE );
        
        if( p_buffer != NULL )
        {
            uint32_t i_second_mData_bytes = __MIN( p_buffer->i_nb_bytes, ioData->mBuffers[0].mDataByteSize - i_mData_bytes );
            
            p_aout->p_vlc->pf_memcpy( (uint8_t *)ioData->mBuffers[0].mData + i_mData_bytes, p_buffer->p_buffer, i_second_mData_bytes );
            i_mData_bytes += i_second_mData_bytes;

            if( i_mData_bytes >= ioData->mBuffers[0].mDataByteSize )
            {
                p_sys->i_total_bytes = p_buffer->i_nb_bytes - i_second_mData_bytes;
                p_aout->p_vlc->pf_memcpy( p_sys->p_remainder_buffer, &p_buffer->p_buffer[i_second_mData_bytes], p_sys->i_total_bytes );
            }
            else
            {
                // update current_date
                current_date += (mtime_t) ( (mtime_t) 1000000 / p_aout->output.output.i_rate ) *
                                ( i_second_mData_bytes / 4 / aout_FormatNbChannels( &p_aout->output.output )  ); // 4 is fl32 specific
            }
            aout_BufferFree( p_buffer );
        }
        else
        {
             p_aout->p_vlc->pf_memset( (uint8_t *)ioData->mBuffers[0].mData +i_mData_bytes, 0, ioData->mBuffers[0].mDataByteSize - i_mData_bytes );
             i_mData_bytes += ioData->mBuffers[0].mDataByteSize - i_mData_bytes;
        }
    }
    return( noErr );     
}


/*****************************************************************************
 * Setup a digital stream
 *****************************************************************************/
static int DigitalInit( aout_instance_t * p_aout )
{
    OSStatus            err = noErr;
    UInt32              i, i_param_size;
    AudioDeviceID       devid_def;
    AudioDeviceID       *p_devices = NULL;
    vlc_value_t         val, text;

    struct aout_sys_t   *p_sys = p_aout->output.p_sys;

    
    
    return (VLC_SUCCESS);

error:
    return VLC_EGENERIC;
}

int AudioDeviceHasOutput( AudioDeviceID i_dev_id )
{
    UInt32			dataSize;
    Boolean			isWritable;
	
    verify_noerr( AudioDeviceGetPropertyInfo( i_dev_id, 0, FALSE, kAudioDevicePropertyStreams, &dataSize, &isWritable) );
    if (dataSize == 0) return FALSE;
    
    return TRUE;
}


/*****************************************************************************
 * HardwareListener: Warns us of changes in the list of registered devices
 *****************************************************************************/
static OSStatus HardwareListener( AudioHardwarePropertyID inPropertyID,
                                  void * inClientData )
{
    OSStatus err = noErr;

    aout_instance_t     *p_aout = (aout_instance_t *)inClientData;
    /* struct aout_sys_t   *p_sys = p_aout->output.p_sys; */

    switch( inPropertyID )
    {
        case kAudioHardwarePropertyDevices:
        {
            /* something changed in the list of devices */
            /* We trigger the audio-device's aout_ChannelsRestart callback */
            var_Change( p_aout, "audio-device", VLC_VAR_TRIGGER_CALLBACKS, NULL, NULL );
        }
        break;
    }

    return( err );
}