research.m1stereo.tv/gitweb/ - melted/blob - src/modules/core/producer_consumer.c

   1 /*
   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>
   5  *
   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.
  10  *
  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.
  15  *
  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
  19  */
  20
  21 #include <framework/mlt.h>
  22
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <math.h>
  26 #include <string.h>
  27
  28 struct context_s {
  29         mlt_producer this;
  30         mlt_producer producer;
  31         mlt_consumer consumer;
  32         mlt_profile profile;
  33 };
  34 typedef struct context_s *context;
  35
  36
  37 static int get_image( mlt_frame frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  38 {
  39         context cx = mlt_frame_pop_service( frame );
  40         mlt_frame nested_frame = mlt_frame_pop_service( frame );
  41
  42         *width = cx->profile->width;
  43         *height = cx->profile->height;
  44
  45         int result = mlt_frame_get_image( nested_frame, image, format, width, height, writable );
  46
  47         // Allocate the image
  48         int size = *width * *height * ( *format == mlt_image_yuv422 ? 2 : *format == mlt_image_rgb24 ? 3 : *format == mlt_image_rgb24a ? 4 : ( 3 / 2 ) );
  49         uint8_t *new_image = mlt_pool_alloc( size );
  50
  51         // Update the frame
  52         mlt_properties properties = mlt_frame_properties( frame );
  53         mlt_properties_set_data( properties, "image", new_image, size, mlt_pool_release, NULL );
  54         memcpy( new_image, *image, size );
  55         mlt_frame_close( nested_frame );
  56         *image = new_image;
  57
  58 //      mlt_properties_debug( properties, "frame", stderr );
  59 //      mlt_properties_debug( mlt_frame_properties( nested_frame ), "nested_frame", stderr );
  60
  61         return result;
  62 }
  63
  64 static int get_audio( mlt_frame frame, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
  65 {
  66         mlt_frame nested_frame = mlt_frame_pop_audio( frame );
  67         int result = mlt_frame_get_audio( nested_frame, buffer, format, frequency, channels, samples );
  68         int size = *channels * *samples * sizeof( int16_t );
  69         int16_t *new_buffer = mlt_pool_alloc( size );
  70         mlt_properties_set_data( MLT_FRAME_PROPERTIES( frame ), "audio", new_buffer, size, mlt_pool_release, NULL );
  71         memcpy( new_buffer, *buffer, size );
  72         *buffer = new_buffer;
  73         mlt_frame_close( nested_frame );
  74         return result;
  75 }
  76
  77 static int get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
  78 {
  79         mlt_properties properties = MLT_PRODUCER_PROPERTIES(this);
  80         context cx = mlt_properties_get_data( properties, "context", NULL );
  81
  82         if ( !cx )
  83         {
  84                 // Allocate and initialize our context
  85                 cx = mlt_pool_alloc( sizeof( struct context_s ) );
  86                 mlt_properties_set_data( properties, "context", cx, 0, mlt_pool_release, NULL );
  87                 cx->this = this;
  88                 cx->profile = mlt_profile_init( mlt_properties_get( properties, "profile" ) );
  89
  90                 // For now, we must conform the nested network's frame rate to the parent network's
  91                 // framerate.
  92                 mlt_profile profile = mlt_service_profile( MLT_PRODUCER_SERVICE( this ) );
  93                 cx->profile->frame_rate_num = profile->frame_rate_num;
  94                 cx->profile->frame_rate_den = profile->frame_rate_den;
  95
  96                 // We will encapsulate a consumer
  97                 cx->consumer = mlt_consumer_new( cx->profile );
  98                 mlt_properties_set_int( MLT_CONSUMER_PROPERTIES( cx->consumer ), "real_time", 0 );
  99
 100                 // Encapsulate a real producer for the resource
 101                 cx->producer = mlt_factory_producer( cx->profile, mlt_environment( "MLT_PRODUCER" ),
 102                         mlt_properties_get( properties, "resource" ) );
 103                 mlt_properties_pass_list( properties, MLT_PRODUCER_PROPERTIES( cx->producer ),
 104                         "in, out, length, resource" );
 105
 106                 // Since we control the seeking, prevent it from seeking on its own
 107                 mlt_producer_set_speed( cx->producer, 0 );
 108
 109                 // Connect it all together
 110                 mlt_consumer_connect( cx->consumer, MLT_PRODUCER_SERVICE( cx->producer ) );
 111                 mlt_consumer_start( cx->consumer );
 112         }
 113
 114         // Generate a frame
 115         *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( this ) );
 116         if ( frame )
 117         {
 118                 // Our "in" needs to be the same, keep it so
 119                 mlt_properties_pass_list( MLT_PRODUCER_PROPERTIES( cx->producer ), properties, "in" );
 120
 121                 // Seek the producer to the correct place
 122                 // Calculate our positions
 123                 double actual_position = mlt_producer_get_speed( this ) * (double)mlt_producer_position( this );
 124                 mlt_position need_first = floor( actual_position );
 125                 mlt_producer_seek( cx->producer, need_first );
 126
 127                 // Get the nested frame
 128                 mlt_frame nested_frame = mlt_consumer_rt_frame( cx->consumer );
 129
 130                 // Stack the producer and our methods on the nested frame
 131                 mlt_frame_push_service( *frame, nested_frame );
 132                 mlt_frame_push_service( *frame, cx );
 133                 mlt_frame_push_get_image( *frame, get_image );
 134                 mlt_frame_push_audio( *frame, nested_frame );
 135                 mlt_frame_push_audio( *frame, get_audio );
 136
 137                 // Give the returned frame temporal identity
 138                 mlt_frame_set_position( *frame, mlt_producer_position( this ) );
 139
 140                 // Put additional references on the frame so both get_image and get_audio
 141                 // methods can close it.
 142                 mlt_properties_inc_ref( MLT_FRAME_PROPERTIES( nested_frame ) );
 143
 144                 // Inform the normalizers about our video properties
 145                 mlt_properties frame_props = MLT_FRAME_PROPERTIES( *frame );
 146                 mlt_properties_set_double( frame_props, "aspect_ratio", mlt_profile_sar( cx->profile ) );
 147                 mlt_properties_set_double( frame_props, "width", cx->profile->width );
 148                 mlt_properties_set_double( frame_props, "height", cx->profile->height );
 149         }
 150
 151         // Calculate the next timecode
 152         mlt_producer_prepare_next( this );
 153
 154         return 0;
 155 }
 156
 157 static void producer_close( mlt_producer this )
 158 {
 159         context cx = mlt_properties_get_data( MLT_PRODUCER_PROPERTIES( this ), "context", NULL );
 160
 161         // Shut down all the encapsulated services
 162         if ( cx )
 163         {
 164                 mlt_consumer_stop( cx->consumer );
 165                 mlt_consumer_close( cx->consumer );
 166                 mlt_producer_close( cx->producer );
 167                 free( cx->profile );
 168         }
 169
 170         this->close = NULL;
 171         mlt_producer_close( this );
 172         free( this );
 173 }
 174
 175 mlt_producer producer_consumer_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
 176 {
 177         mlt_producer this = mlt_producer_new( );
 178
 179         // Encapsulate the real producer
 180         mlt_producer real_producer = mlt_factory_producer( profile, mlt_environment( "MLT_PRODUCER" ), arg );
 181
 182         if ( this && real_producer )
 183         {
 184                 // Override some producer methods
 185                 this->close = ( mlt_destructor )producer_close;
 186                 this->get_frame = get_frame;
 187
 188                 // Get the properties of this producer
 189                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 190                 mlt_properties_set( properties, "resource", arg );
 191                 mlt_properties_pass_list( properties, MLT_PRODUCER_PROPERTIES( real_producer ), "out, length" );
 192
 193                 // Done with the producer - will re-open later when we have the profile property
 194                 mlt_producer_close( real_producer );
 195         }
 196         else
 197         {
 198                 if ( this )
 199                         mlt_producer_close( this );
 200                 if ( real_producer )
 201                         mlt_producer_close( real_producer );
 202
 203                 this = NULL;
 204         }
 205         return this;
 206 }