git.sesse.net Git - mlt/blob - src/modules/jackrack/filter_ladspa.c

   1 /*
   2  * filter_ladspa.c -- filter audio through LADSPA plugins
   3  * Copyright (C) 2004-2005 Ushodaya Enterprises Limited
   4  * Author: Dan Dennedy <dan@dennedy.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program 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
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include <framework/mlt_filter.h>
  22 #include <framework/mlt_frame.h>
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <sys/types.h>
  27 #include <unistd.h>
  28
  29 #include <pthread.h>
  30 #include <string.h>
  31
  32 #include "jack_rack.h"
  33
  34 #define BUFFER_LEN 10000
  35
  36 static void initialise_jack_rack( mlt_properties properties, int channels )
  37 {
  38         int i;
  39         char mlt_name[20];
  40
  41         // Propogate these for the Jack processing callback
  42         mlt_properties_set_int( properties, "channels", channels );
  43
  44         // Start JackRack
  45         if ( mlt_properties_get( properties, "src" ) )
  46         {
  47                 // Create JackRack without Jack client name so that it only uses LADSPA
  48                 jack_rack_t *jackrack = jack_rack_new( NULL, channels );
  49                 mlt_properties_set_data( properties, "jackrack", jackrack, 0, NULL, NULL );
  50                 jack_rack_open_file( jackrack, mlt_properties_get( properties, "src" ) );
  51         }
  52
  53         // Allocate buffers
  54         LADSPA_Data **input_buffers = mlt_pool_alloc( sizeof( LADSPA_Data ) * channels );
  55         LADSPA_Data **output_buffers = mlt_pool_alloc( sizeof( LADSPA_Data ) * channels );
  56
  57         // Set properties - released inside filter_close
  58         mlt_properties_set_data( properties, "input_buffers", input_buffers, sizeof( LADSPA_Data *) * channels, NULL, NULL );
  59         mlt_properties_set_data( properties, "output_buffers", output_buffers, sizeof( LADSPA_Data *) * channels, NULL, NULL );
  60
  61         // Register Jack ports
  62         for ( i = 0; i < channels; i++ )
  63         {
  64                 input_buffers[i] = mlt_pool_alloc( BUFFER_LEN * sizeof( LADSPA_Data ) );
  65                 snprintf( mlt_name, sizeof( mlt_name ), "ibuf%d", i );
  66                 mlt_properties_set_data( properties, mlt_name, input_buffers[i], BUFFER_LEN * sizeof( LADSPA_Data ), NULL, NULL );
  67
  68                 output_buffers[i] = mlt_pool_alloc( BUFFER_LEN * sizeof( LADSPA_Data ) );
  69                 snprintf( mlt_name, sizeof( mlt_name ), "obuf%d", i );
  70                 mlt_properties_set_data( properties, mlt_name, output_buffers[i], BUFFER_LEN * sizeof( LADSPA_Data ), NULL, NULL );
  71         }
  72 }
  73
  74
  75 /** Get the audio.
  76 */
  77
  78 static int ladspa_get_audio( mlt_frame frame, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
  79 {
  80         // Get the filter service
  81         mlt_filter filter = mlt_frame_pop_audio( frame );
  82
  83         // Get the filter properties
  84         mlt_properties filter_properties = MLT_FILTER_PROPERTIES( filter );
  85
  86         // Get the producer's audio
  87         mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
  88
  89         // Initialise LADSPA if needed
  90         jack_rack_t *jackrack = mlt_properties_get_data( filter_properties, "jackrack", NULL );
  91         if ( jackrack == NULL )
  92         {
  93                 sample_rate = *frequency;
  94                 initialise_jack_rack( filter_properties, *channels );
  95                 jackrack = mlt_properties_get_data( filter_properties, "jackrack", NULL );
  96         }
  97
  98         // Get the filter-specific properties
  99         LADSPA_Data **input_buffers = mlt_properties_get_data( filter_properties, "input_buffers", NULL );
 100         LADSPA_Data **output_buffers = mlt_properties_get_data( filter_properties, "output_buffers", NULL );
 101
 102         // Process the audio
 103         int16_t *q = *buffer;
 104         int i, j;
 105
 106         // Convert to floats and write into output ringbuffer
 107         for ( i = 0; i < *samples; i++ )
 108                 for ( j = 0; j < *channels; j++ )
 109                         input_buffers[ j ][ i ] = ( float )( *q ++ ) / 32768.0;
 110
 111         // Do LADSPA processing
 112         if ( jackrack && process_ladspa( jackrack->procinfo, *samples, input_buffers, output_buffers) == 0 )
 113         {
 114                 // Read from output buffer and convert from floats
 115                 q = *buffer;
 116                 for ( i = 0; i < *samples; i++ )
 117                         for ( j = 0; j < *channels; j++ )
 118                         {
 119                                 if ( output_buffers[ j ][ i ] > 1.0 )
 120                                         output_buffers[ j ][ i ] = 1.0;
 121                                 else if ( output_buffers[ j ][ i ] < -1.0 )
 122                                         output_buffers[ j ][ i ] = -1.0;
 123
 124                                 if ( output_buffers[ j ][ i ] > 0 )
 125                                         *q ++ = 32767 * output_buffers[ j ][ i ];
 126                                 else
 127                                         *q ++ = 32768 * output_buffers[ j ][ i ];
 128                         }
 129         }
 130
 131         return 0;
 132 }
 133
 134
 135 /** Filter processing.
 136 */
 137
 138 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 139 {
 140         {
 141                 mlt_frame_push_audio( frame, this );
 142                 mlt_frame_push_audio( frame, ladspa_get_audio );
 143         }
 144
 145         return frame;
 146 }
 147
 148
 149 static void filter_close( mlt_filter this )
 150 {
 151         int i;
 152         char mlt_name[20];
 153         mlt_properties properties = MLT_FILTER_PROPERTIES( this );
 154
 155         if ( mlt_properties_get_data( properties, "jackrack", NULL ) != NULL )
 156         {
 157                 for ( i = 0; i < mlt_properties_get_int( properties, "channels" ); i++ )
 158                 {
 159                         snprintf( mlt_name, sizeof( mlt_name ), "obuf%d", i );
 160                         mlt_pool_release( mlt_properties_get_data( properties, mlt_name, NULL ) );
 161                         snprintf( mlt_name, sizeof( mlt_name ), "ibuf%d", i );
 162                         mlt_pool_release( mlt_properties_get_data( properties, mlt_name, NULL ) );
 163                 }
 164                 mlt_pool_release( mlt_properties_get_data( properties, "output_buffers", NULL ) );
 165                 mlt_pool_release( mlt_properties_get_data( properties, "input_buffers", NULL ) );
 166
 167                 jack_rack_t *jackrack = mlt_properties_get_data( properties, "jackrack", NULL );
 168                 jack_rack_destroy( jackrack );
 169         }
 170         this->parent.close = NULL;
 171         mlt_service_close( &this->parent );
 172 }
 173
 174 /** Constructor for the filter.
 175 */
 176
 177 mlt_filter filter_ladspa_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
 178 {
 179         mlt_filter this = mlt_filter_new( );
 180         if ( this != NULL )
 181         {
 182                 mlt_properties properties = MLT_FILTER_PROPERTIES( this );
 183
 184                 this->process = filter_process;
 185                 this->close = filter_close;
 186
 187                 mlt_properties_set( properties, "src", arg );
 188         }
 189         return this;
 190 }