--- /dev/null
+/*
+ * consumer_rtaudio.c -- output through RtAudio audio wrapper
+ * Copyright (C) 2011 Dan Dennedy <dan@dennedy.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with consumer library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <framework/mlt.h>
+#include <stdlib.h>
+#include <string.h>
+#include <pthread.h>
+#include <sys/time.h>
+#include "RtAudio.h"
+
+static void consumer_refresh_cb( mlt_consumer sdl, mlt_consumer consumer, char *name );
+static int rtaudio_callback( void *outputBuffer, void *inputBuffer,
+ unsigned int nFrames, double streamTime, RtAudioStreamStatus status, void *userData );
+static void *consumer_thread_proxy( void *arg );
+static void *video_thread_proxy( void *arg );
+
+class RtAudioConsumer
+{
+public:
+ struct mlt_consumer_s consumer;
+ RtAudio rt;
+ int device_id;
+ mlt_deque queue;
+ pthread_t thread;
+ int joined;
+ int running;
+ uint8_t audio_buffer[4096 * 10];
+ int audio_avail;
+ pthread_mutex_t audio_mutex;
+ pthread_cond_t audio_cond;
+ pthread_mutex_t video_mutex;
+ pthread_cond_t video_cond;
+ int playing;
+ pthread_cond_t refresh_cond;
+ pthread_mutex_t refresh_mutex;
+ int refresh_count;
+
+ mlt_consumer getConsumer()
+ { return &consumer; }
+
+ RtAudioConsumer()
+ : device_id(-1)
+ , joined(0)
+ , running(0)
+ , audio_avail(0)
+ , playing(0)
+ , refresh_count(0)
+ {}
+
+ ~RtAudioConsumer()
+ {
+ // Close the queue
+ mlt_deque_close( queue );
+
+ // Destroy mutexes
+ pthread_mutex_destroy( &audio_mutex );
+ pthread_cond_destroy( &audio_cond );
+ pthread_mutex_destroy( &video_mutex );
+ pthread_cond_destroy( &video_cond );
+ pthread_mutex_destroy( &refresh_mutex );
+ pthread_cond_destroy( &refresh_cond );
+
+ if ( rt.isStreamOpen() )
+ rt.closeStream();
+ }
+
+ bool open( const char* arg )
+ {
+ if ( rt.getDeviceCount() < 1 )
+ {
+ mlt_log_warning( getConsumer(), "no audio devices found\n" );
+ return false;
+ }
+
+ if ( !arg || !strcmp( arg, "" ) )
+ {
+#ifndef __LINUX_ALSA__
+ device_id = rt.getDefaultOutputDevice();
+#endif
+ }
+ else if ( strcmp( arg, "default" ) )
+ {
+ // Get device ID by name
+ unsigned int n = rt.getDeviceCount();
+ RtAudio::DeviceInfo info;
+ unsigned int i;
+
+ for ( i = 0; i < n; i++ )
+ {
+ info = rt.getDeviceInfo( i );
+ mlt_log_verbose( NULL, "RtAudio device %d = %s\n",
+ i, info.name.c_str() );
+ if ( info.probed && info.name == arg )
+ {
+ device_id = i;
+ break;
+ }
+ }
+ // Name selection failed, treat arg as numeric
+ if ( i == n )
+ device_id = (int) strtol( arg, NULL, 0 );
+ }
+
+ // Create the queue
+ queue = mlt_deque_init( );
+
+ // get a handle on properties
+ mlt_properties properties = MLT_CONSUMER_PROPERTIES( &consumer );
+
+ // Set the default volume
+ mlt_properties_set_double( properties, "volume", 1.0 );
+
+ // This is the initialisation of the consumer
+ pthread_mutex_init( &audio_mutex, NULL );
+ pthread_cond_init( &audio_cond, NULL);
+ pthread_mutex_init( &video_mutex, NULL );
+ pthread_cond_init( &video_cond, NULL);
+
+ // Default scaler (for now we'll use nearest)
+ mlt_properties_set( properties, "rescale", "nearest" );
+ mlt_properties_set( properties, "deinterlace_method", "onefield" );
+
+ // Default buffer for low latency
+ mlt_properties_set_int( properties, "buffer", 1 );
+
+ // Default audio buffer
+ mlt_properties_set_int( properties, "audio_buffer", 1024 );
+
+ // Ensure we don't join on a non-running object
+ joined = 1;
+
+ // Initialize the refresh handler
+ pthread_cond_init( &refresh_cond, NULL );
+ pthread_mutex_init( &refresh_mutex, NULL );
+ mlt_events_listen( properties, this, "property-changed", ( mlt_listener )consumer_refresh_cb );
+
+ return true;
+ }
+
+ int start()
+ {
+ if ( !running )
+ {
+ stop();
+ running = 1;
+ joined = 0;
+ pthread_create( &thread, NULL, consumer_thread_proxy, this );
+ }
+
+ return 0;
+ }
+
+ int stop()
+ {
+ if ( running && !joined )
+ {
+ // Kill the thread and clean up
+ joined = 1;
+ running = 0;
+
+ // Unlatch the consumer thread
+ pthread_mutex_lock( &refresh_mutex );
+ pthread_cond_broadcast( &refresh_cond );
+ pthread_mutex_unlock( &refresh_mutex );
+
+ // Cleanup the main thread
+ pthread_join( thread, NULL );
+
+ // Unlatch the video thread
+ pthread_mutex_lock( &video_mutex );
+ pthread_cond_broadcast( &video_cond );
+ pthread_mutex_unlock( &video_mutex );
+
+ // Unlatch the audio callback
+ pthread_mutex_lock( &audio_mutex );
+ pthread_cond_broadcast( &audio_cond );
+ pthread_mutex_unlock( &audio_mutex );
+
+ if ( rt.isStreamOpen() )
+ try {
+ // Stop the stream
+ rt.stopStream();
+ }
+ catch ( RtError& e ) {
+ mlt_log_error( getConsumer(), "%s\n", e.getMessage().c_str() );
+ }
+ }
+
+ return 0;
+ }
+
+ void consumer_thread()
+ {
+ // Get the properties
+ mlt_properties consumer_props = MLT_CONSUMER_PROPERTIES( getConsumer() );
+
+ // Video thread
+ pthread_t thread;
+
+ // internal intialization
+ int init_audio = 1;
+ int init_video = 1;
+ mlt_frame frame = NULL;
+ mlt_properties properties = NULL;
+ int duration = 0;
+ int64_t playtime = 0;
+ struct timespec tm = { 0, 100000 };
+ // int last_position = -1;
+ refresh_count = 0;
+
+ // Loop until told not to
+ while ( running )
+ {
+ // Get a frame from the attached producer
+ frame = mlt_consumer_rt_frame( getConsumer() );
+
+ // Ensure that we have a frame
+ if ( frame )
+ {
+ // Get the frame properties
+ properties = MLT_FRAME_PROPERTIES( frame );
+
+ // Get the speed of the frame
+ double speed = mlt_properties_get_double( properties, "_speed" );
+
+ // Get refresh request for the current frame
+ int refresh = mlt_properties_get_int( consumer_props, "refresh" );
+
+ // Clear refresh
+ mlt_events_block( consumer_props, consumer_props );
+ mlt_properties_set_int( consumer_props, "refresh", 0 );
+ mlt_events_unblock( consumer_props, consumer_props );
+
+ // Play audio
+ init_audio = play_audio( frame, init_audio, &duration );
+
+ // Determine the start time now
+ if ( playing && init_video )
+ {
+ // Create the video thread
+ pthread_create( &thread, NULL, video_thread_proxy, this );
+
+ // Video doesn't need to be initialised any more
+ init_video = 0;
+ }
+
+ // Set playtime for this frame
+ mlt_properties_set_int( properties, "playtime", playtime );
+
+ while ( running && speed != 0 && mlt_deque_count( queue ) > 15 )
+ nanosleep( &tm, NULL );
+
+ // Push this frame to the back of the queue
+ if ( running && speed )
+ {
+ pthread_mutex_lock( &video_mutex );
+ mlt_deque_push_back( queue, frame );
+ pthread_cond_broadcast( &video_cond );
+ pthread_mutex_unlock( &video_mutex );
+
+ // Calculate the next playtime
+ playtime += ( duration * 1000 );
+ }
+ else if ( running )
+ {
+ pthread_mutex_lock( &refresh_mutex );
+ if ( refresh == 0 && refresh_count <= 0 )
+ {
+ play_video( frame );
+ pthread_cond_wait( &refresh_cond, &refresh_mutex );
+ }
+ mlt_frame_close( frame );
+ refresh_count --;
+ pthread_mutex_unlock( &refresh_mutex );
+ }
+ else
+ {
+ mlt_frame_close( frame );
+ frame = NULL;
+ }
+
+ // Optimisation to reduce latency
+ if ( frame && speed == 1.0 )
+ {
+ // TODO: disabled due to misbehavior on parallel-consumer
+ // if ( last_position != -1 && last_position + 1 != mlt_frame_get_position( frame ) )
+ // mlt_consumer_purge( consumer );
+ // last_position = mlt_frame_get_position( frame );
+ }
+ else
+ {
+ mlt_consumer_purge( getConsumer() );
+ // last_position = -1;
+ }
+ }
+ }
+
+ // Kill the video thread
+ if ( init_video == 0 )
+ {
+ pthread_mutex_lock( &video_mutex );
+ pthread_cond_broadcast( &video_cond );
+ pthread_mutex_unlock( &video_mutex );
+ pthread_join( thread, NULL );
+ }
+
+ while( mlt_deque_count( queue ) )
+ mlt_frame_close( (mlt_frame) mlt_deque_pop_back( queue ) );
+
+ audio_avail = 0;
+ }
+
+ int callback( int16_t *outbuf, int16_t *inbuf,
+ unsigned int samples, double streamTime, RtAudioStreamStatus status )
+ {
+ mlt_properties properties = MLT_CONSUMER_PROPERTIES( getConsumer() );
+ double volume = mlt_properties_get_double( properties, "volume" );
+ int channels = mlt_properties_get_int( properties, "channels" );
+ int len = mlt_audio_format_size( mlt_audio_s16, samples, channels );
+
+ pthread_mutex_lock( &audio_mutex );
+
+ // Block until audio received
+ while ( running && len > audio_avail )
+ pthread_cond_wait( &audio_cond, &audio_mutex );
+
+ if ( audio_avail >= len )
+ {
+ // Place in the audio buffer
+ memcpy( outbuf, audio_buffer, len );
+
+ // Remove len from the audio available
+ audio_avail -= len;
+
+ // Remove the samples
+ memmove( audio_buffer, audio_buffer + len, audio_avail );
+ }
+ else
+ {
+ // Just to be safe, wipe the stream first
+ memset( outbuf, 0, len );
+
+ // Copy what we have
+ memcpy( outbuf, audio_buffer, audio_avail );
+
+ // No audio left
+ audio_avail = 0;
+ }
+
+ if ( volume != 1.0 )
+ {
+ int16_t *p = outbuf;
+ int i = samples * channels + 1;
+ while ( --i )
+ *p++ *= volume;
+ }
+
+ // We're definitely playing now
+ playing = 1;
+
+ pthread_cond_broadcast( &audio_cond );
+ pthread_mutex_unlock( &audio_mutex );
+
+ return 0;
+ }
+
+ int play_audio( mlt_frame frame, int init_audio, int *duration )
+ {
+ // Get the properties of this consumer
+ mlt_properties properties = MLT_CONSUMER_PROPERTIES( getConsumer() );
+ mlt_audio_format afmt = mlt_audio_s16;
+
+ // Set the preferred params of the test card signal
+ int channels = mlt_properties_get_int( properties, "channels" );
+ int frequency = mlt_properties_get_int( properties, "frequency" );
+ static int counter = 0;
+ int samples = mlt_sample_calculator( mlt_properties_get_double( properties, "fps" ), frequency, counter++ );
+ int16_t *pcm;
+ int bytes;
+
+ mlt_frame_get_audio( frame, (void**) &pcm, &afmt, &frequency, &channels, &samples );
+ *duration = ( ( samples * 1000 ) / frequency );
+
+ if ( mlt_properties_get_int( properties, "audio_off" ) )
+ {
+ playing = 1;
+ init_audio = 1;
+ return init_audio;
+ }
+
+ if ( init_audio == 1 )
+ {
+ RtAudio::StreamParameters parameters;
+ parameters.deviceId = device_id;
+ parameters.nChannels = channels;
+ parameters.firstChannel = 0;
+ RtAudio::StreamOptions options;
+#ifdef __LINUX_ALSA__
+ if ( device_id == -1 )
+ {
+ options.flags = RTAUDIO_ALSA_USE_DEFAULT;
+ parameters.deviceId = 0;
+ }
+#endif
+ unsigned int bufferFrames = mlt_properties_get_int( properties, "audio_buffer" );
+
+ try {
+ rt.openStream( ¶meters, NULL, RTAUDIO_SINT16,
+ frequency, &bufferFrames, &rtaudio_callback, this, &options );
+ rt.startStream();
+ init_audio = 0;
+ }
+ catch ( RtError& e ) {
+ mlt_log_error( getConsumer(), "%s\n", e.getMessage().c_str() );
+ init_audio = 2;
+ }
+ }
+
+ if ( init_audio == 0 )
+ {
+ mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
+ bytes = ( samples * channels * 2 );
+ pthread_mutex_lock( &audio_mutex );
+ while ( running && bytes > ( sizeof( audio_buffer) - audio_avail ) )
+ pthread_cond_wait( &audio_cond, &audio_mutex );
+ if ( running )
+ {
+ if ( mlt_properties_get_double( properties, "_speed" ) == 1 )
+ memcpy( &audio_buffer[ audio_avail ], pcm, bytes );
+ else
+ memset( &audio_buffer[ audio_avail ], 0, bytes );
+ audio_avail += bytes;
+ }
+ pthread_cond_broadcast( &audio_cond );
+ pthread_mutex_unlock( &audio_mutex );
+ }
+ else
+ {
+ playing = 1;
+ }
+
+ return init_audio;
+ }
+
+ int play_video( mlt_frame frame )
+ {
+ // Get the properties of this consumer
+ mlt_properties properties = MLT_CONSUMER_PROPERTIES( getConsumer() );
+ if ( running && !mlt_consumer_is_stopped( getConsumer() ) )
+ mlt_events_fire( properties, "consumer-frame-show", frame, NULL );
+
+ return 0;
+ }
+
+ void video_thread()
+ {
+ // Obtain time of thread start
+ struct timeval now;
+ int64_t start = 0;
+ int64_t elapsed = 0;
+ struct timespec tm;
+ mlt_frame next = NULL;
+ mlt_properties properties = MLT_CONSUMER_PROPERTIES( getConsumer() );
+ double speed = 0;
+
+ // Get real time flag
+ int real_time = mlt_properties_get_int( properties, "real_time" );
+
+ // Get the current time
+ gettimeofday( &now, NULL );
+
+ // Determine start time
+ start = ( int64_t )now.tv_sec * 1000000 + now.tv_usec;
+
+ while ( running )
+ {
+ // Pop the next frame
+ pthread_mutex_lock( &video_mutex );
+ next = (mlt_frame) mlt_deque_pop_front( queue );
+ while ( next == NULL && running )
+ {
+ pthread_cond_wait( &video_cond, &video_mutex );
+ next = (mlt_frame) mlt_deque_pop_front( queue );
+ }
+ pthread_mutex_unlock( &video_mutex );
+
+ if ( !running || next == NULL ) break;
+
+ // Get the properties
+ properties = MLT_FRAME_PROPERTIES( next );
+
+ // Get the speed of the frame
+ speed = mlt_properties_get_double( properties, "_speed" );
+
+ // Get the current time
+ gettimeofday( &now, NULL );
+
+ // Get the elapsed time
+ elapsed = ( ( int64_t )now.tv_sec * 1000000 + now.tv_usec ) - start;
+
+ // See if we have to delay the display of the current frame
+ if ( mlt_properties_get_int( properties, "rendered" ) == 1 && running )
+ {
+ // Obtain the scheduled playout time
+ int64_t scheduled = mlt_properties_get_int( properties, "playtime" );
+
+ // Determine the difference between the elapsed time and the scheduled playout time
+ int64_t difference = scheduled - elapsed;
+
+ // Smooth playback a bit
+ if ( real_time && ( difference > 20000 && speed == 1.0 ) )
+ {
+ tm.tv_sec = difference / 1000000;
+ tm.tv_nsec = ( difference % 1000000 ) * 500;
+ nanosleep( &tm, NULL );
+ }
+
+ // Show current frame if not too old
+ if ( !real_time || ( difference > -10000 || speed != 1.0 || mlt_deque_count( queue ) < 2 ) )
+ play_video( next );
+
+ // If the queue is empty, recalculate start to allow build up again
+ if ( real_time && ( mlt_deque_count( queue ) == 0 && speed == 1.0 ) )
+ {
+ gettimeofday( &now, NULL );
+ start = ( ( int64_t )now.tv_sec * 1000000 + now.tv_usec ) - scheduled + 20000;
+ }
+ }
+
+ // This frame can now be closed
+ mlt_frame_close( next );
+ next = NULL;
+ }
+
+ if ( next != NULL )
+ mlt_frame_close( next );
+
+ mlt_consumer_stopped( getConsumer() );
+ }
+
+};
+
+static void consumer_refresh_cb( mlt_consumer sdl, mlt_consumer consumer, char *name )
+{
+ if ( !strcmp( name, "refresh" ) )
+ {
+ RtAudioConsumer* rtaudio = (RtAudioConsumer*) consumer->child;
+ pthread_mutex_lock( &rtaudio->refresh_mutex );
+ rtaudio->refresh_count = rtaudio->refresh_count <= 0 ? 1 : rtaudio->refresh_count + 1;
+ pthread_cond_broadcast( &rtaudio->refresh_cond );
+ pthread_mutex_unlock( &rtaudio->refresh_mutex );
+ }
+}
+
+static int rtaudio_callback( void *outputBuffer, void *inputBuffer,
+ unsigned int nFrames, double streamTime, RtAudioStreamStatus status, void *userData )
+{
+ RtAudioConsumer* rtaudio = (RtAudioConsumer*) userData;
+ return rtaudio->callback( (int16_t*) outputBuffer, (int16_t*) inputBuffer, nFrames, streamTime, status );
+}
+
+static void *consumer_thread_proxy( void *arg )
+{
+ RtAudioConsumer* rtaudio = (RtAudioConsumer*) arg;
+ rtaudio->consumer_thread();
+ return NULL;
+}
+
+static void *video_thread_proxy( void *arg )
+{
+ RtAudioConsumer* rtaudio = (RtAudioConsumer*) arg;
+ rtaudio->video_thread();
+ return NULL;
+}
+
+/** Start the consumer.
+ */
+
+static int start( mlt_consumer consumer )
+{
+ RtAudioConsumer* rtaudio = (RtAudioConsumer*) consumer->child;
+ return rtaudio->start();
+}
+
+/** Stop the consumer.
+ */
+
+static int stop( mlt_consumer consumer )
+{
+ RtAudioConsumer* rtaudio = (RtAudioConsumer*) consumer->child;
+ return rtaudio->stop();
+}
+
+/** Determine if the consumer is stopped.
+ */
+
+static int is_stopped( mlt_consumer consumer )
+{
+ RtAudioConsumer* rtaudio = (RtAudioConsumer*) consumer->child;
+ return !rtaudio->running;
+}
+
+/** Close the consumer.
+ */
+
+static void close( mlt_consumer consumer )
+{
+ // Stop the consumer
+ mlt_consumer_stop( consumer );
+
+ // Close the parent
+ consumer->close = NULL;
+ mlt_consumer_close( consumer );
+
+ // Free the memory
+ delete (RtAudioConsumer*) consumer->child;
+}
+
+extern "C" {
+
+mlt_consumer consumer_rtaudio_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
+{
+ // Allocate the consumer
+ RtAudioConsumer* rtaudio = new RtAudioConsumer();
+ mlt_consumer consumer = NULL;
+
+ // If allocated
+ if ( rtaudio && !mlt_consumer_init( rtaudio->getConsumer(), rtaudio, profile ) )
+ {
+ // If initialises without error
+ if ( rtaudio->open( arg ) )
+ {
+ // Setup callbacks
+ consumer = rtaudio->getConsumer();
+ consumer->close = close;
+ consumer->start = start;
+ consumer->stop = stop;
+ consumer->is_stopped = is_stopped;
+ }
+ else
+ {
+ mlt_consumer_close( rtaudio->getConsumer() );
+ delete rtaudio;
+ }
+ }
+
+ // Return consumer
+ return consumer;
+}
+
+static mlt_properties metadata( mlt_service_type type, const char *id, void *data )
+{
+ char file[ PATH_MAX ];
+ const char *service_type = "consumer";
+ snprintf( file, PATH_MAX, "%s/rtaudio/%s_%s.yml", mlt_environment( "MLT_DATA" ), service_type, id );
+ return mlt_properties_parse_yaml( file );
+}
+
+MLT_REPOSITORY
+{
+ MLT_REGISTER( consumer_type, "rtaudio", consumer_rtaudio_init );
+ MLT_REGISTER_METADATA( consumer_type, "rtaudio", metadata, NULL );
+}
+
+} // extern C
projects / mlt / blobdiff