--- /dev/null
+/*
+ * producer_consumer.c -- produce as a consumer of an encapsulated producer
+ * Copyright (C) 2008 Ushodaya Enterprises Limited
+ * Author: 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 this 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 <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <string.h>
+
+struct context_s {
+ mlt_producer this;
+ mlt_producer producer;
+ mlt_consumer consumer;
+ mlt_profile profile;
+};
+typedef struct context_s *context;
+
+
+static int get_image( mlt_frame frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
+{
+ context cx = mlt_frame_pop_service( frame );
+ mlt_frame nested_frame = mlt_frame_pop_service( frame );
+
+ *width = cx->profile->width;
+ *height = cx->profile->height;
+
+ int result = mlt_frame_get_image( nested_frame, image, format, width, height, writable );
+
+ // Allocate the image
+ int size = *width * *height * ( *format == mlt_image_yuv422 ? 2 : *format == mlt_image_rgb24 ? 3 : *format == mlt_image_rgb24a ? 4 : ( 3 / 2 ) );
+ uint8_t *new_image = mlt_pool_alloc( size );
+
+ // Update the frame
+ mlt_properties properties = mlt_frame_properties( frame );
+ mlt_properties_set_data( properties, "image", new_image, size, mlt_pool_release, NULL );
+ memcpy( new_image, *image, size );
+ mlt_frame_close( nested_frame );
+ *image = new_image;
+
+// mlt_properties_debug( properties, "frame", stderr );
+// mlt_properties_debug( mlt_frame_properties( nested_frame ), "nested_frame", stderr );
+
+ return result;
+}
+
+static int get_audio( mlt_frame frame, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
+{
+ mlt_frame nested_frame = mlt_frame_pop_audio( frame );
+ int result = mlt_frame_get_audio( nested_frame, buffer, format, frequency, channels, samples );
+ int size = *channels * *samples * sizeof( int16_t );
+ int16_t *new_buffer = mlt_pool_alloc( size );
+ mlt_properties_set_data( MLT_FRAME_PROPERTIES( frame ), "audio", new_buffer, size, mlt_pool_release, NULL );
+ memcpy( new_buffer, *buffer, size );
+ *buffer = new_buffer;
+ mlt_frame_close( nested_frame );
+ return result;
+}
+
+static int get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
+{
+ mlt_properties properties = MLT_PRODUCER_PROPERTIES(this);
+ context cx = mlt_properties_get_data( properties, "context", NULL );
+
+ if ( !cx )
+ {
+ // Allocate and initialize our context
+ cx = mlt_pool_alloc( sizeof( struct context_s ) );
+ mlt_properties_set_data( properties, "context", cx, 0, mlt_pool_release, NULL );
+ cx->this = this;
+ cx->profile = mlt_profile_init( mlt_properties_get( properties, "profile" ) );
+
+ // For now, we must conform the nested network's frame rate to the parent network's
+ // framerate.
+ mlt_profile profile = mlt_service_profile( MLT_PRODUCER_SERVICE( this ) );
+ cx->profile->frame_rate_num = profile->frame_rate_num;
+ cx->profile->frame_rate_den = profile->frame_rate_den;
+
+ // We will encapsulate a consumer
+ cx->consumer = mlt_consumer_new( cx->profile );
+ mlt_properties_set_int( MLT_CONSUMER_PROPERTIES( cx->consumer ), "real_time", 0 );
+
+ // Encapsulate a real producer for the resource
+ cx->producer = mlt_factory_producer( cx->profile, mlt_environment( "MLT_PRODUCER" ),
+ mlt_properties_get( properties, "resource" ) );
+ mlt_properties_pass_list( properties, MLT_PRODUCER_PROPERTIES( cx->producer ),
+ "in, out, length, resource" );
+
+ // Since we control the seeking, prevent it from seeking on its own
+ mlt_producer_set_speed( cx->producer, 0 );
+
+ // Connect it all together
+ mlt_consumer_connect( cx->consumer, MLT_PRODUCER_SERVICE( cx->producer ) );
+ mlt_consumer_start( cx->consumer );
+ }
+
+ // Generate a frame
+ *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( this ) );
+ if ( frame )
+ {
+ // Our "in" needs to be the same, keep it so
+ mlt_properties_pass_list( MLT_PRODUCER_PROPERTIES( cx->producer ), properties, "in" );
+
+ // Seek the producer to the correct place
+ // Calculate our positions
+ double actual_position = mlt_producer_get_speed( this ) * (double)mlt_producer_position( this );
+ mlt_position need_first = floor( actual_position );
+ mlt_producer_seek( cx->producer, need_first );
+
+ // Get the nested frame
+ mlt_frame nested_frame = mlt_consumer_rt_frame( cx->consumer );
+
+ // Stack the producer and our methods on the nested frame
+ mlt_frame_push_service( *frame, nested_frame );
+ mlt_frame_push_service( *frame, cx );
+ mlt_frame_push_get_image( *frame, get_image );
+ mlt_frame_push_audio( *frame, nested_frame );
+ mlt_frame_push_audio( *frame, get_audio );
+
+ // Give the returned frame temporal identity
+ mlt_frame_set_position( *frame, mlt_producer_position( this ) );
+
+ // Put additional references on the frame so both get_image and get_audio
+ // methods can close it.
+ mlt_properties_inc_ref( MLT_FRAME_PROPERTIES( nested_frame ) );
+
+ // Inform the normalizers about our video properties
+ mlt_properties frame_props = MLT_FRAME_PROPERTIES( *frame );
+ mlt_properties_set_double( frame_props, "aspect_ratio", mlt_profile_sar( cx->profile ) );
+ mlt_properties_set_double( frame_props, "width", cx->profile->width );
+ mlt_properties_set_double( frame_props, "height", cx->profile->height );
+ }
+
+ // Calculate the next timecode
+ mlt_producer_prepare_next( this );
+
+ return 0;
+}
+
+static void producer_close( mlt_producer this )
+{
+ context cx = mlt_properties_get_data( MLT_PRODUCER_PROPERTIES( this ), "context", NULL );
+
+ // Shut down all the encapsulated services
+ if ( cx )
+ {
+ mlt_consumer_stop( cx->consumer );
+ mlt_consumer_close( cx->consumer );
+ mlt_producer_close( cx->producer );
+ free( cx->profile );
+ }
+
+ this->close = NULL;
+ mlt_producer_close( this );
+ free( this );
+}
+
+mlt_producer producer_consumer_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
+{
+ mlt_producer this = mlt_producer_new( );
+
+ // Encapsulate the real producer
+ mlt_producer real_producer = mlt_factory_producer( profile, mlt_environment( "MLT_PRODUCER" ), arg );
+
+ if ( this && real_producer )
+ {
+ // Override some producer methods
+ this->close = ( mlt_destructor )producer_close;
+ this->get_frame = get_frame;
+
+ // Get the properties of this producer
+ mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
+ mlt_properties_set( properties, "resource", arg );
+
+ mlt_producer_close( real_producer );
+ }
+ else
+ {
+ if ( this )
+ mlt_producer_close( this );
+ if ( real_producer )
+ mlt_producer_close( real_producer );
+
+ this = NULL;
+ }
+ return this;
+}
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