research.m1stereo.tv/gitweb/ - melted/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 "filter_ladspa.h"
  22
  23 #include <framework/mlt_frame.h>
  24
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <sys/types.h>
  28 #include <unistd.h>
  29
  30 #include <pthread.h>
  31 #include <string.h>
  32
  33 #include "jack_rack.h"
  34
  35 #define BUFFER_LEN 10000
  36
  37 static void initialise_jack_rack( mlt_properties properties, int channels )
  38 {
  39         int i;
  40         char mlt_name[20];
  41
  42         // Propogate these for the Jack processing callback
  43         mlt_properties_set_int( properties, "channels", channels );
  44
  45         // Start JackRack
  46         if ( mlt_properties_get( properties, "src" ) )
  47         {
  48                 // Create JackRack without Jack client name so that it only uses LADSPA
  49                 jack_rack_t *jackrack = jack_rack_new( NULL, channels );
  50                 mlt_properties_set_data( properties, "jackrack", jackrack, 0, NULL, NULL );
  51                 jack_rack_open_file( jackrack, mlt_properties_get( properties, "src" ) );
  52         }
  53
  54         // Allocate buffers
  55         LADSPA_Data **input_buffers = mlt_pool_alloc( sizeof( LADSPA_Data ) * channels );
  56         LADSPA_Data **output_buffers = mlt_pool_alloc( sizeof( LADSPA_Data ) * channels );
  57
  58         // Set properties - released inside filter_close
  59         mlt_properties_set_data( properties, "input_buffers", input_buffers, sizeof( LADSPA_Data *) * channels, NULL, NULL );
  60         mlt_properties_set_data( properties, "output_buffers", output_buffers, sizeof( LADSPA_Data *) * channels, NULL, NULL );
  61
  62         // Register Jack ports
  63         for ( i = 0; i < channels; i++ )
  64         {
  65                 input_buffers[i] = mlt_pool_alloc( BUFFER_LEN * sizeof( LADSPA_Data ) );
  66                 snprintf( mlt_name, sizeof( mlt_name ), "ibuf%d", i );
  67                 mlt_properties_set_data( properties, mlt_name, input_buffers[i], BUFFER_LEN * sizeof( LADSPA_Data ), NULL, NULL );
  68
  69                 output_buffers[i] = mlt_pool_alloc( BUFFER_LEN * sizeof( LADSPA_Data ) );
  70                 snprintf( mlt_name, sizeof( mlt_name ), "obuf%d", i );
  71                 mlt_properties_set_data( properties, mlt_name, output_buffers[i], BUFFER_LEN * sizeof( LADSPA_Data ), NULL, NULL );
  72         }
  73 }
  74
  75
  76 /** Get the audio.
  77 */
  78
  79 static int ladspa_get_audio( mlt_frame frame, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
  80 {
  81         // Get the filter service
  82         mlt_filter filter = mlt_frame_pop_audio( frame );
  83
  84         // Get the filter properties
  85         mlt_properties filter_properties = MLT_FILTER_PROPERTIES( filter );
  86
  87         // Get the producer's audio
  88         mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
  89
  90         // Initialise LADSPA if needed
  91         jack_rack_t *jackrack = mlt_properties_get_data( filter_properties, "jackrack", NULL );
  92         if ( jackrack == NULL )
  93         {
  94                 sample_rate = *frequency;
  95                 initialise_jack_rack( filter_properties, *channels );
  96                 jackrack = mlt_properties_get_data( filter_properties, "jackrack", NULL );
  97         }
  98
  99         // Get the filter-specific properties
 100         LADSPA_Data **input_buffers = mlt_properties_get_data( filter_properties, "input_buffers", NULL );
 101         LADSPA_Data **output_buffers = mlt_properties_get_data( filter_properties, "output_buffers", NULL );
 102
 103         // Process the audio
 104         int16_t *q = *buffer;
 105         int i, j;
 106
 107         // Convert to floats and write into output ringbuffer
 108         for ( i = 0; i < *samples; i++ )
 109                 for ( j = 0; j < *channels; j++ )
 110                         input_buffers[ j ][ i ] = ( float )( *q ++ ) / 32768.0;
 111
 112         // Do LADSPA processing
 113         if ( jackrack && process_ladspa( jackrack->procinfo, *samples, input_buffers, output_buffers) == 0 )
 114         {
 115                 // Read from output buffer and convert from floats
 116                 q = *buffer;
 117                 for ( i = 0; i < *samples; i++ )
 118                         for ( j = 0; j < *channels; j++ )
 119                         {
 120                                 if ( output_buffers[ j ][ i ] > 1.0 )
 121                                         output_buffers[ j ][ i ] = 1.0;
 122                                 else if ( output_buffers[ j ][ i ] < -1.0 )
 123                                         output_buffers[ j ][ i ] = -1.0;
 124
 125                                 if ( output_buffers[ j ][ i ] > 0 )
 126                                         *q ++ = 32767 * output_buffers[ j ][ i ];
 127                                 else
 128                                         *q ++ = 32768 * output_buffers[ j ][ i ];
 129                         }
 130         }
 131
 132         return 0;
 133 }
 134
 135
 136 /** Filter processing.
 137 */
 138
 139 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 140 {
 141         {
 142                 mlt_frame_push_audio( frame, this );
 143                 mlt_frame_push_audio( frame, ladspa_get_audio );
 144         }
 145
 146         return frame;
 147 }
 148
 149
 150 static void filter_close( mlt_filter this )
 151 {
 152         int i;
 153         char mlt_name[20];
 154         mlt_properties properties = MLT_FILTER_PROPERTIES( this );
 155
 156         if ( mlt_properties_get_data( properties, "jackrack", NULL ) != NULL )
 157         {
 158                 for ( i = 0; i < mlt_properties_get_int( properties, "channels" ); i++ )
 159                 {
 160                         snprintf( mlt_name, sizeof( mlt_name ), "obuf%d", i );
 161                         mlt_pool_release( mlt_properties_get_data( properties, mlt_name, NULL ) );
 162                         snprintf( mlt_name, sizeof( mlt_name ), "ibuf%d", i );
 163                         mlt_pool_release( mlt_properties_get_data( properties, mlt_name, NULL ) );
 164                 }
 165                 mlt_pool_release( mlt_properties_get_data( properties, "output_buffers", NULL ) );
 166                 mlt_pool_release( mlt_properties_get_data( properties, "input_buffers", NULL ) );
 167
 168                 jack_rack_t *jackrack = mlt_properties_get_data( properties, "jackrack", NULL );
 169                 jack_rack_destroy( jackrack );
 170         }
 171         this->parent.close = NULL;
 172         mlt_service_close( &this->parent );
 173 }
 174
 175 /** Constructor for the filter.
 176 */
 177
 178 mlt_filter filter_ladspa_init( char *arg )
 179 {
 180         mlt_filter this = mlt_filter_new( );
 181         if ( this != NULL )
 182         {
 183                 mlt_properties properties = MLT_FILTER_PROPERTIES( this );
 184
 185                 this->process = filter_process;
 186                 this->close = filter_close;
 187
 188                 mlt_properties_set( properties, "src", arg );
 189         }
 190         return this;
 191 }