+++ /dev/null
-/*
- * filter_resample.c -- adjust audio sample frequency
- * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
- * Author: Dan Dennedy <dan@dennedy.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software Foundation,
- * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- */
-
-#include <framework/mlt_filter.h>
-#include <framework/mlt_frame.h>
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <samplerate.h>
-#define __USE_ISOC99 1
-#include <math.h>
-
-#define BUFFER_LEN 20480
-#define RESAMPLE_TYPE SRC_SINC_FASTEST
-
-/** Get the audio.
-*/
-
-static int resample_get_audio( mlt_frame frame, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
-{
- // Get the properties of the frame
- mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
-
- // Get the filter service
- mlt_filter filter = mlt_frame_pop_audio( frame );
-
- // Get the filter properties
- mlt_properties filter_properties = MLT_FILTER_PROPERTIES( filter );
-
- // Get the resample information
- int output_rate = mlt_properties_get_int( filter_properties, "frequency" );
- SRC_STATE *state = mlt_properties_get_data( filter_properties, "state", NULL );
- float *input_buffer = mlt_properties_get_data( filter_properties, "input_buffer", NULL );
- float *output_buffer = mlt_properties_get_data( filter_properties, "output_buffer", NULL );
- int channels_avail = *channels;
- SRC_DATA data;
- int i;
-
- // If no resample frequency is specified, default to requested value
- if ( output_rate == 0 )
- output_rate = *frequency;
-
- // Get the producer's audio
- mlt_frame_get_audio( frame, buffer, format, frequency, &channels_avail, samples );
-
- // Duplicate channels as necessary
- if ( channels_avail < *channels )
- {
- int size = *channels * *samples * sizeof( int16_t );
- int16_t *new_buffer = mlt_pool_alloc( size );
- int j, k = 0;
-
- // Duplicate the existing channels
- for ( i = 0; i < *samples; i++ )
- {
- for ( j = 0; j < *channels; j++ )
- {
- new_buffer[ ( i * *channels ) + j ] = (*buffer)[ ( i * channels_avail ) + k ];
- k = ( k + 1 ) % channels_avail;
- }
- }
-
- // Update the audio buffer now - destroys the old
- mlt_properties_set_data( properties, "audio", new_buffer, size, ( mlt_destructor )mlt_pool_release, NULL );
-
- *buffer = new_buffer;
- }
- else if ( channels_avail == 6 && *channels == 2 )
- {
- // Nasty hack for ac3 5.1 audio - may be a cause of failure?
- int size = *channels * *samples * sizeof( int16_t );
- int16_t *new_buffer = mlt_pool_alloc( size );
-
- // Drop all but the first *channels
- for ( i = 0; i < *samples; i++ )
- {
- new_buffer[ ( i * *channels ) + 0 ] = (*buffer)[ ( i * channels_avail ) + 2 ];
- new_buffer[ ( i * *channels ) + 1 ] = (*buffer)[ ( i * channels_avail ) + 3 ];
- }
-
- // Update the audio buffer now - destroys the old
- mlt_properties_set_data( properties, "audio", new_buffer, size, ( mlt_destructor )mlt_pool_release, NULL );
-
- *buffer = new_buffer;
- }
-
- // Return now if no work to do
- if ( output_rate != *frequency )
- {
- float *p = input_buffer;
- float *end = p + *samples * *channels;
- int16_t *q = *buffer;
-
- // Convert to floating point
- while( p != end )
- *p ++ = ( float )( *q ++ ) / 32768.0;
-
- // Resample
- data.data_in = input_buffer;
- data.data_out = output_buffer;
- data.src_ratio = ( float ) output_rate / ( float ) *frequency;
- data.input_frames = *samples;
- data.output_frames = BUFFER_LEN / *channels;
- data.end_of_input = 0;
- i = src_process( state, &data );
- if ( i == 0 )
- {
- if ( data.output_frames_gen > *samples )
- {
- *buffer = mlt_pool_realloc( *buffer, data.output_frames_gen * *channels * sizeof( int16_t ) );
- mlt_properties_set_data( properties, "audio", *buffer, *channels * data.output_frames_gen * 2, mlt_pool_release, NULL );
- }
-
- *samples = data.output_frames_gen;
- *frequency = output_rate;
-
- p = output_buffer;
- q = *buffer;
- end = p + *samples * *channels;
-
- // Convert from floating back to signed 16bit
- while( p != end )
- {
- if ( *p > 1.0 )
- *p = 1.0;
- if ( *p < -1.0 )
- *p = -1.0;
- if ( *p > 0 )
- *q ++ = 32767 * *p ++;
- else
- *q ++ = 32768 * *p ++;
- }
- }
- else
- fprintf( stderr, "resample_get_audio: %s %d,%d,%d\n", src_strerror( i ), *frequency, *samples, output_rate );
- }
-
- return 0;
-}
-
-/** Filter processing.
-*/
-
-static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
-{
- if ( mlt_frame_is_test_audio( frame ) == 0 )
- {
- mlt_frame_push_audio( frame, this );
- mlt_frame_push_audio( frame, resample_get_audio );
- }
-
- return frame;
-}
-
-/** Constructor for the filter.
-*/
-
-mlt_filter filter_resample_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
-{
- mlt_filter this = mlt_filter_new( );
- if ( this != NULL )
- {
- int error;
- SRC_STATE *state = src_new( RESAMPLE_TYPE, 2 /* channels */, &error );
- if ( error == 0 )
- {
- void *input_buffer = mlt_pool_alloc( BUFFER_LEN );
- void *output_buffer = mlt_pool_alloc( BUFFER_LEN );
- this->process = filter_process;
- if ( arg != NULL )
- mlt_properties_set_int( MLT_FILTER_PROPERTIES( this ), "frequency", atoi( arg ) );
- mlt_properties_set_int( MLT_FILTER_PROPERTIES( this ), "channels", 2 );
- mlt_properties_set_data( MLT_FILTER_PROPERTIES( this ), "state", state, 0, (mlt_destructor)src_delete, NULL );
- mlt_properties_set_data( MLT_FILTER_PROPERTIES( this ), "input_buffer", input_buffer, BUFFER_LEN, mlt_pool_release, NULL );
- mlt_properties_set_data( MLT_FILTER_PROPERTIES( this ), "output_buffer", output_buffer, BUFFER_LEN, mlt_pool_release, NULL );
- }
- else
- {
- fprintf( stderr, "filter_resample_init: %s\n", src_strerror( error ) );
- }
- }
- return this;
-}
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