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;
34 typedef struct context_s *context;
37 static int get_image( mlt_frame frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
39 context cx = mlt_frame_pop_service( frame );
40 mlt_frame nested_frame = mlt_frame_pop_service( frame );
42 *width = cx->profile->width;
43 *height = cx->profile->height;
45 int result = mlt_frame_get_image( nested_frame, image, format, width, height, writable );
48 int size = *width * *height * ( *format == mlt_image_yuv422 ? 2 : *format == mlt_image_rgb24 ? 3 :
49 ( *format == mlt_image_rgb24a || *format == mlt_image_opengl ) ? 4 : ( 3 / 2 ) );
50 uint8_t *new_image = mlt_pool_alloc( size );
53 mlt_properties properties = mlt_frame_properties( frame );
54 mlt_frame_set_image( frame, new_image, size, mlt_pool_release );
55 memcpy( new_image, *image, size );
56 mlt_properties_set( properties, "progressive", mlt_properties_get( MLT_FRAME_PROPERTIES(nested_frame), "progressive" ) );
59 // Copy the alpha channel
60 uint8_t *alpha = mlt_properties_get_data( MLT_FRAME_PROPERTIES( nested_frame ), "alpha", &size );
61 if ( alpha && size > 0 )
63 new_image = mlt_pool_alloc( size );
64 memcpy( new_image, alpha, size );
65 mlt_frame_set_alpha( frame, new_image, size, mlt_pool_release );
71 static int get_audio( mlt_frame frame, void **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
73 mlt_frame nested_frame = mlt_frame_pop_audio( frame );
74 int result = mlt_frame_get_audio( nested_frame, buffer, format, frequency, channels, samples );
75 int size = mlt_audio_format_size( *format, *samples, *channels );
76 int16_t *new_buffer = mlt_pool_alloc( size );
78 mlt_frame_set_audio( frame, new_buffer, *format, size, mlt_pool_release );
79 memcpy( new_buffer, *buffer, size );
85 static int get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
87 mlt_properties properties = MLT_PRODUCER_PROPERTIES(this);
88 context cx = mlt_properties_get_data( properties, "context", NULL );
92 // Allocate and initialize our context
93 cx = mlt_pool_alloc( sizeof( struct context_s ) );
94 mlt_properties_set_data( properties, "context", cx, 0, mlt_pool_release, NULL );
96 char *profile_name = mlt_properties_get( properties, "profile" );
97 mlt_profile profile = mlt_service_profile( MLT_PRODUCER_SERVICE( this ) );
101 cx->profile = mlt_profile_init( profile_name );
102 cx->profile->is_explicit = 1;
106 cx->profile = mlt_profile_clone( profile );
107 cx->profile->is_explicit = 0;
110 // For now, we must conform the nested network's frame rate to the parent network's
112 cx->profile->frame_rate_num = profile->frame_rate_num;
113 cx->profile->frame_rate_den = profile->frame_rate_den;
115 // Encapsulate a real producer for the resource
116 cx->producer = mlt_factory_producer( cx->profile, NULL,
117 mlt_properties_get( properties, "resource" ) );
118 mlt_properties_pass_list( properties, MLT_PRODUCER_PROPERTIES( cx->producer ),
121 // Since we control the seeking, prevent it from seeking on its own
122 mlt_producer_set_speed( cx->producer, 0 );
124 // We will encapsulate a consumer
125 cx->consumer = mlt_consumer_new( cx->profile );
126 // Do not use _pass_list on real_time so that it defaults to 0 in the absence of
127 // an explicit real_time property.
128 mlt_properties_set_int( MLT_CONSUMER_PROPERTIES( cx->consumer ), "real_time",
129 mlt_properties_get_int( properties, "real_time" ) );
130 mlt_properties_pass_list( MLT_CONSUMER_PROPERTIES( cx->consumer ), properties,
131 "buffer, prefill, deinterlace_method, rescale" );
133 // Connect it all together
134 mlt_consumer_connect( cx->consumer, MLT_PRODUCER_SERVICE( cx->producer ) );
135 mlt_consumer_start( cx->consumer );
139 *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( this ) );
142 // Our "in" needs to be the same, keep it so
143 mlt_properties_pass_list( MLT_PRODUCER_PROPERTIES( cx->producer ), properties, "in, out" );
145 // Seek the producer to the correct place
146 // Calculate our positions
147 double actual_position = (double)mlt_producer_position( this );
148 if ( mlt_producer_get_speed( this ) != 0 )
149 actual_position *= mlt_producer_get_speed( this );
150 mlt_position need_first = floor( actual_position );
151 mlt_producer_seek( cx->producer, need_first );
153 // Get the nested frame
154 mlt_frame nested_frame = mlt_consumer_rt_frame( cx->consumer );
156 // Stack the producer and our methods on the nested frame
157 mlt_frame_push_service( *frame, nested_frame );
158 mlt_frame_push_service( *frame, cx );
159 mlt_frame_push_get_image( *frame, get_image );
160 mlt_frame_push_audio( *frame, nested_frame );
161 mlt_frame_push_audio( *frame, get_audio );
163 // Give the returned frame temporal identity
164 mlt_frame_set_position( *frame, mlt_producer_position( this ) );
166 // Store the nested frame on the produced frame for destruction
167 mlt_properties frame_props = MLT_FRAME_PROPERTIES( *frame );
168 mlt_properties_set_data( frame_props, "_producer_consumer.frame", nested_frame, 0, (mlt_destructor) mlt_frame_close, NULL );
170 // Inform the normalizers about our video properties
171 mlt_properties_set_double( frame_props, "aspect_ratio", mlt_profile_sar( cx->profile ) );
172 mlt_properties_set_int( frame_props, "width", cx->profile->width );
173 mlt_properties_set_int( frame_props, "height", cx->profile->height );
174 mlt_properties_set_int( frame_props, "real_width", cx->profile->width );
175 mlt_properties_set_int( frame_props, "real_height", cx->profile->height );
176 mlt_properties_set_int( frame_props, "progressive", cx->profile->progressive );
179 // Calculate the next timecode
180 mlt_producer_prepare_next( this );
185 static void producer_close( mlt_producer this )
187 context cx = mlt_properties_get_data( MLT_PRODUCER_PROPERTIES( this ), "context", NULL );
189 // Shut down all the encapsulated services
192 mlt_consumer_stop( cx->consumer );
193 mlt_consumer_close( cx->consumer );
194 mlt_producer_close( cx->producer );
195 mlt_profile_close( cx->profile );
199 mlt_producer_close( this );
203 mlt_producer producer_consumer_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
205 mlt_producer this = mlt_producer_new( profile );
207 // Encapsulate the real producer
208 mlt_profile temp_profile = mlt_profile_init( NULL );
209 mlt_producer real_producer = mlt_factory_producer( temp_profile, NULL, arg );
211 if ( this && real_producer )
213 // Override some producer methods
214 this->close = ( mlt_destructor )producer_close;
215 this->get_frame = get_frame;
217 // Get the properties of this producer
218 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
219 mlt_properties_set( properties, "resource", arg );
220 mlt_properties_pass_list( properties, MLT_PRODUCER_PROPERTIES( real_producer ), "out, length" );
222 // Done with the producer - will re-open later when we have the profile property
223 mlt_producer_close( real_producer );
228 mlt_producer_close( this );
230 mlt_producer_close( real_producer );
234 mlt_profile_close( temp_profile );