void setup_audio( ) {
/* FIXME hard coded default */
n_channels = 2;
audio_in_pipe = new Pipe<AudioPacket *>(OUT_PIPE_SIZE);
/* FIXME magic 29.97 related number */
/* Set up empty audio packet for prerolling */
current_audio_pkt = new AudioPacket(48000, n_channels, 2, 25626);
samples_written_from_current_audio_pkt = 0;
assert(deckLinkOutput != NULL);
if (deckLinkOutput->SetAudioCallback(this) != S_OK) {
throw std::runtime_error(
"Failed to set DeckLink audio callback"
);
}
if (deckLinkOutput->EnableAudioOutput(
bmdAudioSampleRate48kHz, bmdAudioSampleType16bitInteger,
n_channels, bmdAudioOutputStreamContinuous) != S_OK) {
throw std::runtime_error(
"Failed to enable DeckLink audio output"
);
}
audio_preroll_done = 0;
if (deckLinkOutput->BeginAudioPreroll( ) != S_OK) {
throw std::runtime_error(
"Failed to begin DeckLink audio preroll"
);
}
while (audio_preroll_done == 0) {
/* FIXME: busy wait */
}
if (deckLinkOutput->EndAudioPreroll( ) != S_OK) {
throw std::runtime_error(
"Failed to end DeckLink audio preroll"
);
}
}
void setup_audio( ) {
IOAudioPacket preroll_audio(8008, n_channels);
preroll_audio.zero( );
audio_in_pipe = new Pipe<IOAudioPacket *>(OUT_PIPE_SIZE);
audio_fifo = new AudioFIFO<int16_t>(n_channels);
audio_fifo->add_packet(&preroll_audio);
assert(deckLinkOutput != NULL);
if (deckLinkOutput->SetAudioCallback(this) != S_OK) {
throw std::runtime_error(
"Failed to set DeckLink audio callback"
);
}
if (deckLinkOutput->EnableAudioOutput(
bmdAudioSampleRate48kHz, bmdAudioSampleType16bitInteger,
n_channels, bmdAudioOutputStreamContinuous) != S_OK) {
throw std::runtime_error(
"Failed to enable DeckLink audio output"
);
}
audio_preroll_done = 0;
if (deckLinkOutput->BeginAudioPreroll( ) != S_OK) {
throw std::runtime_error(
"Failed to begin DeckLink audio preroll"
);
}
while (audio_preroll_done == 0) {
/* FIXME: busy wait */
}
if (deckLinkOutput->EndAudioPreroll( ) != S_OK) {
throw std::runtime_error(
"Failed to end DeckLink audio preroll"
);
}
}
bool open( unsigned card = 0 )
{
IDeckLinkIterator* deckLinkIterator = CreateDeckLinkIteratorInstance();
unsigned i = 0;
if ( !deckLinkIterator )
{
mlt_log_verbose( NULL, "The DeckLink drivers not installed.\n" );
return false;
}
// Connect to the Nth DeckLink instance
do {
if ( deckLinkIterator->Next( &m_deckLink ) != S_OK )
{
mlt_log_verbose( NULL, "DeckLink card not found\n" );
deckLinkIterator->Release();
return false;
}
} while ( ++i <= card );
// Obtain the audio/video output interface (IDeckLinkOutput)
if ( m_deckLink->QueryInterface( IID_IDeckLinkOutput, (void**)&m_deckLinkOutput ) != S_OK )
{
mlt_log_verbose( NULL, "No DeckLink cards support output\n" );
m_deckLink->Release();
m_deckLink = 0;
deckLinkIterator->Release();
return false;
}
// Provide this class as a delegate to the audio and video output interfaces
m_deckLinkOutput->SetScheduledFrameCompletionCallback( this );
m_deckLinkOutput->SetAudioCallback( this );
pthread_mutex_init( &m_mutex, NULL );
pthread_cond_init( &m_condition, NULL );
m_maxAudioBuffer = bmdAudioSampleRate48kHz;
m_videoFrameQ = mlt_deque_init();
return true;
}