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 start( unsigned preroll )
{
m_displayMode = getDisplayMode();
if ( !m_displayMode )
{
mlt_log_error( &m_consumer, "Profile is not compatible with decklink.\n" );
return false;
}
// Set the video output mode
if ( S_OK != m_deckLinkOutput->EnableVideoOutput( m_displayMode->GetDisplayMode(), bmdVideoOutputFlagDefault) )
{
mlt_log_error( &m_consumer, "Failed to enable video output\n" );
return false;
}
// Set the audio output mode
m_channels = 2;
if ( S_OK != m_deckLinkOutput->EnableAudioOutput( bmdAudioSampleRate48kHz, bmdAudioSampleType16bitInteger,
m_channels, bmdAudioOutputStreamContinuous ) )
{
mlt_log_error( &m_consumer, "Failed to enable audio output\n" );
stop();
return false;
}
m_fifo = sample_fifo_init();
// Preroll
m_isPrerolling = true;
m_prerollCounter = 0;
m_preroll = preroll < PREROLL_MINIMUM ? PREROLL_MINIMUM : preroll;
m_count = 0;
m_deckLinkOutput->BeginAudioPreroll();
return true;
}