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192 lines
6.0 KiB
192 lines
6.0 KiB
/*
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* filter_ladspa.c -- filter audio through LADSPA plugins
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* Copyright (C) 2004-2005 Ushodaya Enterprises Limited
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* Author: Dan Dennedy <dan@dennedy.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "filter_ladspa.h"
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#include <framework/mlt_frame.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <pthread.h>
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#include <string.h>
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#include "jack_rack.h"
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#define BUFFER_LEN 10000
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static void initialise_jack_rack( mlt_properties properties, int channels )
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{
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int i;
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char mlt_name[20];
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// Propogate these for the Jack processing callback
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mlt_properties_set_int( properties, "channels", channels );
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// Start JackRack
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if ( mlt_properties_get( properties, "src" ) )
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{
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// Create JackRack without Jack client name so that it only uses LADSPA
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jack_rack_t *jackrack = jack_rack_new( NULL, channels );
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mlt_properties_set_data( properties, "jackrack", jackrack, 0, NULL, NULL );
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jack_rack_open_file( jackrack, mlt_properties_get( properties, "src" ) );
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}
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// Allocate buffers
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LADSPA_Data **input_buffers = mlt_pool_alloc( sizeof( LADSPA_Data ) * channels );
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LADSPA_Data **output_buffers = mlt_pool_alloc( sizeof( LADSPA_Data ) * channels );
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// Set properties - released inside filter_close
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mlt_properties_set_data( properties, "input_buffers", input_buffers, sizeof( LADSPA_Data *) * channels, NULL, NULL );
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mlt_properties_set_data( properties, "output_buffers", output_buffers, sizeof( LADSPA_Data *) * channels, NULL, NULL );
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// Register Jack ports
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for ( i = 0; i < channels; i++ )
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{
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input_buffers[i] = mlt_pool_alloc( BUFFER_LEN * sizeof( LADSPA_Data ) );
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snprintf( mlt_name, sizeof( mlt_name ), "ibuf%d", i );
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mlt_properties_set_data( properties, mlt_name, input_buffers[i], BUFFER_LEN * sizeof( LADSPA_Data ), NULL, NULL );
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output_buffers[i] = mlt_pool_alloc( BUFFER_LEN * sizeof( LADSPA_Data ) );
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snprintf( mlt_name, sizeof( mlt_name ), "obuf%d", i );
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mlt_properties_set_data( properties, mlt_name, output_buffers[i], BUFFER_LEN * sizeof( LADSPA_Data ), NULL, NULL );
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}
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}
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/** Get the audio.
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*/
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static int ladspa_get_audio( mlt_frame frame, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
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{
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// Get the filter service
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mlt_filter filter = mlt_frame_pop_audio( frame );
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// Get the filter properties
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mlt_properties filter_properties = MLT_FILTER_PROPERTIES( filter );
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// Get the producer's audio
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mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
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// Initialise LADSPA if needed
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jack_rack_t *jackrack = mlt_properties_get_data( filter_properties, "jackrack", NULL );
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if ( jackrack == NULL )
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{
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sample_rate = *frequency;
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initialise_jack_rack( filter_properties, *channels );
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jackrack = mlt_properties_get_data( filter_properties, "jackrack", NULL );
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}
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// Get the filter-specific properties
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LADSPA_Data **input_buffers = mlt_properties_get_data( filter_properties, "input_buffers", NULL );
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LADSPA_Data **output_buffers = mlt_properties_get_data( filter_properties, "output_buffers", NULL );
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// Process the audio
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int16_t *q = *buffer;
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int i, j;
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// Convert to floats and write into output ringbuffer
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for ( i = 0; i < *samples; i++ )
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for ( j = 0; j < *channels; j++ )
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input_buffers[ j ][ i ] = ( float )( *q ++ ) / 32768.0;
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// Do LADSPA processing
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if ( jackrack && process_ladspa( jackrack->procinfo, *samples, input_buffers, output_buffers) == 0 )
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{
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// Read from output buffer and convert from floats
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q = *buffer;
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for ( i = 0; i < *samples; i++ )
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for ( j = 0; j < *channels; j++ )
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{
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if ( output_buffers[ j ][ i ] > 1.0 )
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output_buffers[ j ][ i ] = 1.0;
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else if ( output_buffers[ j ][ i ] < -1.0 )
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output_buffers[ j ][ i ] = -1.0;
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if ( output_buffers[ j ][ i ] > 0 )
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*q ++ = 32767 * output_buffers[ j ][ i ];
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else
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*q ++ = 32768 * output_buffers[ j ][ i ];
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}
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}
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return 0;
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}
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/** Filter processing.
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*/
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static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
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{
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{
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mlt_frame_push_audio( frame, this );
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mlt_frame_push_audio( frame, ladspa_get_audio );
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}
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return frame;
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}
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static void filter_close( mlt_filter this )
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{
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int i;
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char mlt_name[20];
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mlt_properties properties = MLT_FILTER_PROPERTIES( this );
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if ( mlt_properties_get_data( properties, "jackrack", NULL ) != NULL )
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{
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for ( i = 0; i < mlt_properties_get_int( properties, "channels" ); i++ )
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{
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snprintf( mlt_name, sizeof( mlt_name ), "obuf%d", i );
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mlt_pool_release( mlt_properties_get_data( properties, mlt_name, NULL ) );
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snprintf( mlt_name, sizeof( mlt_name ), "ibuf%d", i );
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mlt_pool_release( mlt_properties_get_data( properties, mlt_name, NULL ) );
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}
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mlt_pool_release( mlt_properties_get_data( properties, "output_buffers", NULL ) );
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mlt_pool_release( mlt_properties_get_data( properties, "input_buffers", NULL ) );
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jack_rack_t *jackrack = mlt_properties_get_data( properties, "jackrack", NULL );
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jack_rack_destroy( jackrack );
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}
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this->parent.close = NULL;
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mlt_service_close( &this->parent );
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}
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/** Constructor for the filter.
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*/
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mlt_filter filter_ladspa_init( char *arg )
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{
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mlt_filter this = mlt_filter_new( );
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if ( this != NULL )
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{
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mlt_properties properties = MLT_FILTER_PROPERTIES( this );
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this->process = filter_process;
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this->close = filter_close;
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mlt_properties_set( properties, "src", arg );
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}
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return this;
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}
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