2 * producer_consumer.c -- produce as a consumer of an encapsulated producer
3 * Copyright (C) 2008 Ushodaya Enterprises Limited
4 * Author: Dan Dennedy <dan@dennedy.org>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #include <framework/mlt.h>
30 mlt_producer producer;
31 mlt_consumer consumer;
35 typedef struct context_s *context;
38 static int get_image( mlt_frame frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
40 context cx = mlt_frame_pop_service( frame );
41 mlt_frame nested_frame = mlt_frame_pop_service( frame );
43 *width = cx->profile->width;
44 *height = cx->profile->height;
46 int result = mlt_frame_get_image( nested_frame, image, format, width, height, writable );
49 int size = *width * *height * ( *format == mlt_image_yuv422 ? 2 : *format == mlt_image_rgb24 ? 3 :
50 ( *format == mlt_image_rgb24a || *format == mlt_image_opengl ) ? 4 : ( 3 / 2 ) );
51 uint8_t *new_image = mlt_pool_alloc( size );
54 mlt_properties properties = mlt_frame_properties( frame );
55 mlt_properties_set_data( properties, "image", new_image, size, mlt_pool_release, NULL );
56 memcpy( new_image, *image, size );
57 mlt_frame_close( nested_frame );
60 // mlt_properties_debug( properties, "frame", stderr );
61 // mlt_properties_debug( mlt_frame_properties( nested_frame ), "nested_frame", stderr );
66 static int get_audio( mlt_frame frame, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
68 mlt_frame nested_frame = mlt_frame_pop_audio( frame );
69 int result = mlt_frame_get_audio( nested_frame, buffer, format, frequency, channels, samples );
70 int size = *channels * *samples * sizeof( int16_t );
71 int16_t *new_buffer = mlt_pool_alloc( size );
72 mlt_properties_set_data( MLT_FRAME_PROPERTIES( frame ), "audio", new_buffer, size, mlt_pool_release, NULL );
73 memcpy( new_buffer, *buffer, size );
75 mlt_frame_close( nested_frame );
79 static int get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
81 mlt_properties properties = MLT_PRODUCER_PROPERTIES(this);
82 context cx = mlt_properties_get_data( properties, "context", NULL );
86 // Allocate and initialize our context
87 cx = mlt_pool_alloc( sizeof( struct context_s ) );
88 mlt_properties_set_data( properties, "context", cx, 0, mlt_pool_release, NULL );
90 char *profile_name = mlt_properties_get( properties, "profile" );
91 mlt_profile profile = mlt_service_profile( MLT_PRODUCER_SERVICE( this ) );
95 cx->profile = mlt_profile_init( profile_name );
96 cx->is_close_profile = 1;
100 cx->profile = profile;
101 cx->is_close_profile = 0;
104 // For now, we must conform the nested network's frame rate to the parent network's
106 cx->profile->frame_rate_num = profile->frame_rate_num;
107 cx->profile->frame_rate_den = profile->frame_rate_den;
109 // We will encapsulate a consumer
110 cx->consumer = mlt_consumer_new( cx->profile );
111 // Do not use _pass_list on real_time so that it defaults to 0 in the absence of
112 // an explicit real_time property.
113 mlt_properties_set_int( MLT_CONSUMER_PROPERTIES( cx->consumer ), "real_time",
114 mlt_properties_get_int( properties, "real_time" ) );
115 mlt_properties_pass_list( MLT_CONSUMER_PROPERTIES( cx->consumer ), properties,
118 // Encapsulate a real producer for the resource
119 cx->producer = mlt_factory_producer( cx->profile, NULL,
120 mlt_properties_get( properties, "resource" ) );
121 mlt_properties_pass_list( properties, MLT_PRODUCER_PROPERTIES( cx->producer ),
124 // Since we control the seeking, prevent it from seeking on its own
125 mlt_producer_set_speed( cx->producer, 0 );
127 // Connect it all together
128 mlt_consumer_connect( cx->consumer, MLT_PRODUCER_SERVICE( cx->producer ) );
129 mlt_consumer_start( cx->consumer );
133 *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( this ) );
136 // Our "in" needs to be the same, keep it so
137 mlt_properties_pass_list( MLT_PRODUCER_PROPERTIES( cx->producer ), properties, "in, out" );
139 // Seek the producer to the correct place
140 // Calculate our positions
141 double actual_position = mlt_producer_get_speed( this ) * (double)mlt_producer_position( this );
142 mlt_position need_first = floor( actual_position );
143 mlt_producer_seek( cx->producer, need_first );
145 // Get the nested frame
146 mlt_frame nested_frame = mlt_consumer_rt_frame( cx->consumer );
148 // Stack the producer and our methods on the nested frame
149 mlt_frame_push_service( *frame, nested_frame );
150 mlt_frame_push_service( *frame, cx );
151 mlt_frame_push_get_image( *frame, get_image );
152 mlt_frame_push_audio( *frame, nested_frame );
153 mlt_frame_push_audio( *frame, get_audio );
155 // Give the returned frame temporal identity
156 mlt_frame_set_position( *frame, mlt_producer_position( this ) );
158 // Put additional references on the frame so both get_image and get_audio
159 // methods can close it.
160 mlt_properties_inc_ref( MLT_FRAME_PROPERTIES( nested_frame ) );
162 // Inform the normalizers about our video properties
163 mlt_properties frame_props = MLT_FRAME_PROPERTIES( *frame );
164 mlt_properties_set_double( frame_props, "aspect_ratio", mlt_profile_sar( cx->profile ) );
165 mlt_properties_set_int( frame_props, "width", cx->profile->width );
166 mlt_properties_set_int( frame_props, "height", cx->profile->height );
167 mlt_properties_set_int( frame_props, "real_width", cx->profile->width );
168 mlt_properties_set_int( frame_props, "real_height", cx->profile->height );
169 mlt_properties_set_int( frame_props, "progressive", cx->profile->progressive );
172 // Calculate the next timecode
173 mlt_producer_prepare_next( this );
178 static void producer_close( mlt_producer this )
180 context cx = mlt_properties_get_data( MLT_PRODUCER_PROPERTIES( this ), "context", NULL );
182 // Shut down all the encapsulated services
185 mlt_consumer_stop( cx->consumer );
186 mlt_consumer_close( cx->consumer );
187 mlt_producer_close( cx->producer );
188 if ( cx->is_close_profile )
189 mlt_profile_close( cx->profile );
193 mlt_producer_close( this );
197 mlt_producer producer_consumer_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
199 mlt_producer this = mlt_producer_new( );
201 // Encapsulate the real producer
202 mlt_producer real_producer = mlt_factory_producer( profile, NULL, arg );
204 if ( this && real_producer )
206 // Override some producer methods
207 this->close = ( mlt_destructor )producer_close;
208 this->get_frame = get_frame;
210 // Get the properties of this producer
211 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
212 mlt_properties_set( properties, "resource", arg );
213 mlt_properties_pass_list( properties, MLT_PRODUCER_PROPERTIES( real_producer ), "out, length" );
215 // Done with the producer - will re-open later when we have the profile property
216 mlt_producer_close( real_producer );
221 mlt_producer_close( this );
223 mlt_producer_close( real_producer );