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;
33 int64_t audio_counter;
34 mlt_position audio_position;
36 typedef struct context_s *context;
39 static int get_image( mlt_frame frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
41 context cx = mlt_frame_pop_service( frame );
42 mlt_frame nested_frame = mlt_frame_pop_service( frame );
44 *width = cx->profile->width;
45 *height = cx->profile->height;
47 int result = mlt_frame_get_image( nested_frame, image, format, width, height, writable );
50 int size = mlt_image_format_size( *format, *width, *height, NULL );
51 uint8_t *new_image = mlt_pool_alloc( size );
54 mlt_properties properties = mlt_frame_properties( frame );
55 mlt_frame_set_image( frame, new_image, size, mlt_pool_release );
56 memcpy( new_image, *image, size );
57 mlt_properties_set( properties, "progressive", mlt_properties_get( MLT_FRAME_PROPERTIES(nested_frame), "progressive" ) );
60 // Copy the alpha channel
61 uint8_t *alpha = mlt_properties_get_data( MLT_FRAME_PROPERTIES( nested_frame ), "alpha", &size );
62 if ( alpha && size > 0 )
64 new_image = mlt_pool_alloc( size );
65 memcpy( new_image, alpha, size );
66 mlt_frame_set_alpha( frame, new_image, size, mlt_pool_release );
72 static int get_audio( mlt_frame frame, void **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
74 context cx = mlt_frame_pop_audio( frame );
75 mlt_frame nested_frame = mlt_frame_pop_audio( frame );
78 // if not repeating last frame
79 if ( mlt_frame_get_position( nested_frame ) != cx->audio_position )
81 double fps = mlt_profile_fps( cx->profile );
82 if ( mlt_producer_get_fps( cx->this ) < fps )
83 fps = mlt_producer_get_fps( cx->this );
84 *samples = mlt_sample_calculator( fps, *frequency, cx->audio_counter++ );
85 result = mlt_frame_get_audio( nested_frame, buffer, format, frequency, channels, samples );
86 int size = mlt_audio_format_size( *format, *samples, *channels );
87 int16_t *new_buffer = mlt_pool_alloc( size );
89 mlt_frame_set_audio( frame, new_buffer, *format, size, mlt_pool_release );
90 memcpy( new_buffer, *buffer, size );
95 // otherwise return no samples
98 cx->audio_position = mlt_frame_get_position( nested_frame );
103 static int get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
105 mlt_properties properties = MLT_PRODUCER_PROPERTIES(this);
106 context cx = mlt_properties_get_data( properties, "context", NULL );
110 // Allocate and initialize our context
111 cx = mlt_pool_alloc( sizeof( struct context_s ) );
112 memset( cx, 0, sizeof( *cx ) );
113 mlt_properties_set_data( properties, "context", cx, 0, mlt_pool_release, NULL );
115 char *profile_name = mlt_properties_get( properties, "profile" );
117 profile_name = mlt_properties_get( properties, "mlt_profile" );
118 mlt_profile profile = mlt_service_profile( MLT_PRODUCER_SERVICE( this ) );
122 cx->profile = mlt_profile_init( profile_name );
123 cx->profile->is_explicit = 1;
127 cx->profile = mlt_profile_clone( profile );
128 cx->profile->is_explicit = 0;
131 // Encapsulate a real producer for the resource
132 cx->producer = mlt_factory_producer( cx->profile, NULL,
133 mlt_properties_get( properties, "resource" ) );
134 if ( ( profile_name && !strcmp( profile_name, "auto" ) ) ||
135 mlt_properties_get_int( properties, "autoprofile" ) )
137 mlt_profile_from_producer( cx->profile, cx->producer );
138 mlt_producer_close( cx->producer );
139 cx->producer = mlt_factory_producer( cx->profile, NULL, mlt_properties_get( properties, "resource" ) );
142 // Since we control the seeking, prevent it from seeking on its own
143 mlt_producer_set_speed( cx->producer, 0 );
144 cx->audio_position = -1;
146 // We will encapsulate a consumer
147 cx->consumer = mlt_consumer_new( cx->profile );
148 // Do not use _pass_list on real_time so that it defaults to 0 in the absence of
149 // an explicit real_time property.
150 mlt_properties_set_int( MLT_CONSUMER_PROPERTIES( cx->consumer ), "real_time",
151 mlt_properties_get_int( properties, "real_time" ) );
152 mlt_properties_pass_list( MLT_CONSUMER_PROPERTIES( cx->consumer ), properties,
153 "buffer, prefill, deinterlace_method, rescale" );
155 // Connect it all together
156 mlt_consumer_connect( cx->consumer, MLT_PRODUCER_SERVICE( cx->producer ) );
157 mlt_consumer_start( cx->consumer );
161 *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( this ) );
164 // Seek the producer to the correct place
165 // Calculate our positions
166 double actual_position = (double) mlt_producer_frame( this );
167 if ( mlt_producer_get_speed( this ) != 0 )
168 actual_position *= mlt_producer_get_speed( this );
169 mlt_position need_first = floor( actual_position );
170 mlt_producer_seek( cx->producer, need_first * mlt_profile_fps( cx->profile )
171 / mlt_producer_get_fps( this ) );
173 // Get the nested frame
174 mlt_frame nested_frame = mlt_consumer_rt_frame( cx->consumer );
176 // Stack the producer and our methods on the nested frame
177 mlt_frame_push_service( *frame, nested_frame );
178 mlt_frame_push_service( *frame, cx );
179 mlt_frame_push_get_image( *frame, get_image );
180 mlt_frame_push_audio( *frame, nested_frame );
181 mlt_frame_push_audio( *frame, cx );
182 mlt_frame_push_audio( *frame, get_audio );
184 // Give the returned frame temporal identity
185 mlt_frame_set_position( *frame, mlt_producer_position( this ) );
187 // Store the nested frame on the produced frame for destruction
188 mlt_properties frame_props = MLT_FRAME_PROPERTIES( *frame );
189 mlt_properties_set_data( frame_props, "_producer_consumer.frame", nested_frame, 0, (mlt_destructor) mlt_frame_close, NULL );
191 // Inform the normalizers about our video properties
192 mlt_properties_set_double( frame_props, "aspect_ratio", mlt_profile_sar( cx->profile ) );
193 mlt_properties_set_int( frame_props, "width", cx->profile->width );
194 mlt_properties_set_int( frame_props, "height", cx->profile->height );
195 mlt_properties_set_int( frame_props, "real_width", cx->profile->width );
196 mlt_properties_set_int( frame_props, "real_height", cx->profile->height );
197 mlt_properties_set_int( frame_props, "progressive", cx->profile->progressive );
200 // Calculate the next timecode
201 mlt_producer_prepare_next( this );
206 static void producer_close( mlt_producer this )
208 context cx = mlt_properties_get_data( MLT_PRODUCER_PROPERTIES( this ), "context", NULL );
210 // Shut down all the encapsulated services
213 mlt_consumer_stop( cx->consumer );
214 mlt_consumer_close( cx->consumer );
215 mlt_producer_close( cx->producer );
216 mlt_profile_close( cx->profile );
220 mlt_producer_close( this );
224 mlt_producer producer_consumer_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
226 mlt_producer this = mlt_producer_new( profile );
228 // Encapsulate the real producer
229 mlt_profile temp_profile = mlt_profile_clone( profile );
230 temp_profile->is_explicit = 0;
231 mlt_producer real_producer = mlt_factory_producer( temp_profile, NULL, arg );
233 if ( this && real_producer )
235 // Override some producer methods
236 this->close = ( mlt_destructor )producer_close;
237 this->get_frame = get_frame;
239 // Get the properties of this producer
240 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
241 mlt_properties_set( properties, "resource", arg );
242 mlt_properties_pass_list( properties, MLT_PRODUCER_PROPERTIES( real_producer ), "out, length" );
244 // Done with the producer - will re-open later when we have the profile property
245 mlt_producer_close( real_producer );
250 mlt_producer_close( this );
252 mlt_producer_close( real_producer );
256 mlt_profile_close( temp_profile );