static int Open ( vlc_object_t *p_this )
{
audio_output_t *p_aout = (audio_output_t *)p_this;
struct aout_sys_t *p_sys = malloc(sizeof(aout_sys_t));
p_aout->sys = p_sys;
OSStatus status = 0;
// Setup the audio device.
AudioStreamBasicDescription deviceFormat;
deviceFormat.mSampleRate = 44100;
deviceFormat.mFormatID = kAudioFormatLinearPCM;
deviceFormat.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger; // Signed integer, little endian
deviceFormat.mBytesPerPacket = 4;
deviceFormat.mFramesPerPacket = 1;
deviceFormat.mBytesPerFrame = 4;
deviceFormat.mChannelsPerFrame = 2;
deviceFormat.mBitsPerChannel = 16;
deviceFormat.mReserved = 0;
// Create a new output AudioQueue for the device.
status = AudioQueueNewOutput(&deviceFormat, // Format
AudioQueueCallback, // Callback
p_aout, // User data, passed to the callback
CFRunLoopGetMain(), // RunLoop
kCFRunLoopDefaultMode, // RunLoop mode
0, // Flags ; must be zero (per documentation)...
&(p_sys->audioQueue)); // Output
// This will be used for boosting the audio without the need of a mixer (floating-point conversion is expensive on ARM)
// AudioQueueSetParameter(p_sys->audioQueue, kAudioQueueParam_Volume, 12.0); // Defaults to 1.0
msg_Dbg(p_aout, "New AudioQueue output created (status = %i)", status);
// Allocate buffers for the AudioQueue, and pre-fill them.
for (int i = 0; i < NUMBER_OF_BUFFERS; ++i) {
AudioQueueBufferRef buffer = NULL;
status = AudioQueueAllocateBuffer(p_sys->audioQueue, FRAME_SIZE * 4, &buffer);
AudioQueueCallback(NULL, p_sys->audioQueue, buffer);
}
/* Volume is entirely done in software. */
aout_SoftVolumeInit( p_aout );
p_aout->format.i_format = VLC_CODEC_S16L;
p_aout->format.i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
p_aout->format.i_rate = 44100;
aout_PacketInit(p_aout, &p_sys->packet, FRAME_SIZE);
p_aout->pf_play = aout_PacketPlay;
p_aout->pf_pause = aout_PacketPause;
p_aout->pf_flush = aout_PacketFlush;
msg_Dbg(p_aout, "Starting AudioQueue (status = %i)", status);
status = AudioQueueStart(p_sys->audioQueue, NULL);
return VLC_SUCCESS;
}
static int Open (vlc_object_t *obj)
{
audio_output_t *aout = (audio_output_t *)obj;
aout_sys_t *sys = calloc( 1, sizeof( aout_sys_t ) );
if( unlikely( sys == NULL ))
return VLC_ENOMEM;
aout->sys = sys;
aout->start = Start;
aout->stop = Stop;
aout_SoftVolumeInit( aout );
return VLC_SUCCESS;
}
/*****************************************************************************
* Open: open the audio device
*****************************************************************************/
static int Open ( vlc_object_t *p_this )
{
audio_output_t *p_aout = (audio_output_t *)p_this;
aout_sys_t *p_sys;
char *psz_mode;
ULONG i_kai_mode;
KAISPEC ks_wanted, ks_obtained;
int i_nb_channels;
int i_bytes_per_frame;
vlc_value_t val, text;
audio_format_t format = p_aout->format;
/* Allocate structure */
p_aout->sys = calloc( 1, sizeof( aout_sys_t ) );
if( p_aout->sys == NULL )
return VLC_ENOMEM;
p_sys = p_aout->sys;
if( var_Get( p_aout, "audio-device", &val ) != VLC_ENOVAR )
{
/* The user has selected an audio device. */
if ( val.i_int == AOUT_VAR_STEREO )
{
format.i_physical_channels
= AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
}
else if ( val.i_int == AOUT_VAR_MONO )
{
format.i_physical_channels = AOUT_CHAN_CENTER;
}
}
psz_mode = var_InheritString( p_aout, "kai-audio-device" );
if( !psz_mode )
psz_mode = ( char * )ppsz_kai_audio_device[ 0 ]; // "auto"
i_kai_mode = KAIM_AUTO;
if( strcmp( psz_mode, "dart" ) == 0 )
i_kai_mode = KAIM_DART;
else if( strcmp( psz_mode, "uniaud" ) == 0 )
i_kai_mode = KAIM_UNIAUD;
msg_Dbg( p_aout, "selected mode = %s", psz_mode );
if( psz_mode != ppsz_kai_audio_device[ 0 ])
free( psz_mode );
i_nb_channels = aout_FormatNbChannels( &format );
if ( i_nb_channels > 2 )
{
/* KAI doesn't support more than two channels. */
i_nb_channels = 2;
format.i_physical_channels
= AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
}
/* Support s16l only */
format.i_format = VLC_CODEC_S16L;
aout_FormatPrepare( &format );
i_bytes_per_frame = format.i_bytes_per_frame;
/* Initialize library */
if( kaiInit( i_kai_mode ))
{
msg_Err( p_aout, "cannot initialize KAI");
goto exit_free_sys;
}
ks_wanted.usDeviceIndex = 0;
ks_wanted.ulType = KAIT_PLAY;
ks_wanted.ulBitsPerSample = BPS_16;
ks_wanted.ulSamplingRate = format.i_rate;
ks_wanted.ulDataFormat = MCI_WAVE_FORMAT_PCM;
ks_wanted.ulChannels = i_nb_channels;
ks_wanted.ulNumBuffers = 2;
ks_wanted.ulBufferSize = FRAME_SIZE * i_bytes_per_frame;
ks_wanted.fShareable = !var_InheritBool( p_aout,
"kai-audio-exclusive-mode");
ks_wanted.pfnCallBack = KaiCallback;
ks_wanted.pCallBackData = p_aout;
msg_Dbg( p_aout, "requested ulBufferSize = %ld", ks_wanted.ulBufferSize );
/* Open the sound device. */
if( kaiOpen( &ks_wanted, &ks_obtained, &p_sys->hkai ))
{
msg_Err( p_aout, "cannot open KAI device");
goto exit_kai_done;
}
msg_Dbg( p_aout, "open in %s mode",
ks_obtained.fShareable ? "shareable" : "exclusive" );
msg_Dbg( p_aout, "obtained i_nb_samples = %lu",
ks_obtained.ulBufferSize / i_bytes_per_frame );
msg_Dbg( p_aout, "obtained i_bytes_per_frame = %d",
format.i_bytes_per_frame );
p_aout->format = format;
p_aout->pf_play = Play;
p_aout->pf_pause = aout_PacketPause;
p_aout->pf_flush = aout_PacketFlush;
aout_PacketInit( p_aout, &p_sys->packet,
ks_obtained.ulBufferSize / i_bytes_per_frame );
aout_SoftVolumeInit( p_aout );
if ( var_Type( p_aout, "audio-device" ) == 0 )
{
/* First launch. */
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 );
val.i_int = AOUT_VAR_STEREO;
text.psz_string = _("Stereo");
var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val, &text );
val.i_int = AOUT_VAR_MONO;
text.psz_string = _("Mono");
var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val, &text );
if ( i_nb_channels == 2 )
{
val.i_int = AOUT_VAR_STEREO;
}
else
{
val.i_int = AOUT_VAR_MONO;
}
var_Change( p_aout, "audio-device", VLC_VAR_SETDEFAULT, &val, NULL );
var_AddCallback( p_aout, "audio-device", aout_ChannelsRestart, NULL );
}
/* Prevent SIG_FPE */
_control87(MCW_EM, MCW_EM);
return VLC_SUCCESS;
exit_kai_done :
kaiDone();
exit_free_sys :
free( p_sys );
return VLC_EGENERIC;
}
