API tools faq
paste
barjac

Untitled

barjac
Jan 3rd, 2011
56
0
Never
Add comment
Not a member of Pastebin yet? Sign Up, it unlocks many cool features!
C 13.20 KB | None | 0 0
raw download clone embed print report
  1. /*
  2.  * filter_sox.c -- apply any number of SOX effects using libst
  3.  * Copyright (C) 2003-2004 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_filter.h>
  22. #include <framework/mlt_frame.h>
  23. #include <framework/mlt_tokeniser.h>
  24. #include <framework/mlt_log.h>
  25.  
  26. #include <stdio.h>
  27. #include <stdlib.h>
  28. #include <string.h>
  29. #include <math.h>
  30.  
  31. // TODO: does not support multiple effects with SoX v14.1.0+
  32.  
  33. #ifdef SOX14
  34. #   include <sox.h>
  35. #   define ST_EOF SOX_EOF
  36. #   define ST_SUCCESS SOX_SUCCESS
  37. #   define st_sample_t sox_sample_t
  38. #   define eff_t sox_effect_t*
  39. #   define ST_LIB_VERSION_CODE SOX_LIB_VERSION_CODE
  40. #   define ST_LIB_VERSION SOX_LIB_VERSION
  41. #   if (ST_LIB_VERSION_CODE >= ST_LIB_VERSION(14,2,0))
  42. #       define st_size_t size_t
  43. #   else
  44. #       define st_size_t sox_size_t
  45. #   endif
  46. #   define ST_SIGNED_WORD_TO_SAMPLE(d,clips) SOX_SIGNED_16BIT_TO_SAMPLE(d,clips)
  47. #   if (ST_LIB_VERSION_CODE >= ST_LIB_VERSION(14,1,0))
  48. #       define ST_SSIZE_MIN SOX_SAMPLE_MIN
  49. #   else
  50. #       define ST_SSIZE_MIN SOX_SSIZE_MIN
  51. #   endif
  52. #       define ST_SAMPLE_TO_SIGNED_WORD(d,clips) SOX_SAMPLE_TO_SIGNED_16BIT(d,clips)
  53. #else
  54. #   include <st.h>
  55. #endif
  56.  
  57. #define BUFFER_LEN 8192
  58. #define AMPLITUDE_NORM 0.2511886431509580 /* -12dBFS */
  59. #define AMPLITUDE_MIN 0.00001
  60.  
  61. /** Compute the mean of a set of doubles skipping unset values flagged as -1
  62. */
  63. static inline double mean( double *buf, int count )
  64. {
  65.     double mean = 0;
  66.     int i;
  67.     int j = 0;
  68.    
  69.     for ( i = 0; i < count; i++ )
  70.     {
  71.         if ( buf[ i ] != -1.0 )
  72.         {
  73.             mean += buf[ i ];
  74.             j ++;
  75.         }
  76.     }
  77.     if ( j > 0 )
  78.         mean /= j;
  79.    
  80.     return mean;
  81. }
  82.  
  83. #if (ST_LIB_VERSION_CODE >= ST_LIB_VERSION(14,1,0))
  84. static void delete_effect( eff_t effp )
  85. {
  86.     free( effp->priv );
  87.     free( (void*)effp->in_encoding );
  88.     free( effp );
  89. }
  90. #endif
  91.  
  92. /** Create an effect state instance for a channels
  93. */
  94. static int create_effect( mlt_filter this, char *value, int count, int channel, int frequency )
  95. {
  96.     mlt_tokeniser tokeniser = mlt_tokeniser_init();
  97.     char id[ 256 ];
  98.     int error = 1;
  99.  
  100.     // Tokenise the effect specification
  101.     mlt_tokeniser_parse_new( tokeniser, value, " " );
  102.     if ( tokeniser->count < 1 )
  103.         return error;
  104.  
  105.     // Locate the effect
  106.     mlt_destructor effect_destructor = mlt_pool_release;
  107. #ifdef SOX14
  108.     //fprintf(stderr, "%s: effect %s count %d\n", __FUNCTION__, tokeniser->tokens[0], tokeniser->count );
  109. #if (ST_LIB_VERSION_CODE >= ST_LIB_VERSION(14,1,0))
  110.     sox_effect_handler_t const *eff_handle = sox_find_effect( tokeniser->tokens[0] );
  111.     if (eff_handle == NULL ) return error;
  112.     eff_t eff = sox_create_effect( eff_handle );
  113.     effect_destructor = ( mlt_destructor ) delete_effect;
  114.     sox_encodinginfo_t *enc = calloc( 1, sizeof( sox_encodinginfo_t ) );
  115.     enc->encoding = SOX_ENCODING_SIGN2;
  116.     enc->bits_per_sample = 16;
  117.     eff->in_encoding = eff->out_encoding = enc;
  118. #else
  119.     eff_t eff = mlt_pool_alloc( sizeof( sox_effect_t ) );
  120.     sox_create_effect( eff, sox_find_effect( tokeniser->tokens[0] ) );
  121. #endif
  122.     int opt_count = tokeniser->count - 1;
  123. #else
  124.     eff_t eff = mlt_pool_alloc( sizeof( struct st_effect ) );
  125.     int opt_count = st_geteffect_opt( eff, tokeniser->count, tokeniser->tokens );
  126. #endif
  127.    
  128.     // If valid effect
  129.     if ( opt_count != ST_EOF )
  130.     {
  131.         // Supply the effect parameters
  132. #ifdef SOX14
  133. #if (ST_LIB_VERSION_CODE >= ST_LIB_VERSION(14,2,0))
  134.         if ( sox_effect_options( eff, opt_count, &tokeniser->tokens[ tokeniser->count > 1 ? 1 : 0  ] ) == ST_SUCCESS )
  135. #else
  136.         if ( ( * eff->handler.getopts )( eff, opt_count, &tokeniser->tokens[ tokeniser->count > 1 ? 1 : 0  ] ) == ST_SUCCESS )
  137. #endif
  138. #else
  139.         if ( ( * eff->h->getopts )( eff, opt_count, &tokeniser->tokens[ tokeniser->count - opt_count ] ) == ST_SUCCESS )
  140. #endif
  141.         {
  142.             // Set the sox signal parameters
  143. #if (ST_LIB_VERSION_CODE >= ST_LIB_VERSION(14,1,0))
  144.             eff->in_signal.rate = frequency;
  145.             eff->out_signal.rate = frequency;
  146.             eff->in_signal.channels = 1;
  147.             eff->out_signal.channels = 1;
  148.             eff->in_signal.precision = 16;
  149.             eff->out_signal.precision = 16;
  150.             eff->in_signal.length = 0;
  151.             eff->out_signal.length = 0;
  152. #else
  153.             eff->ininfo.rate = frequency;
  154.             eff->outinfo.rate = frequency;
  155.             eff->ininfo.channels = 1;
  156.             eff->outinfo.channels = 1;
  157. #endif
  158.            
  159.             // Start the effect
  160. #ifdef SOX14
  161.             if ( ( * eff->handler.start )( eff ) == ST_SUCCESS )
  162. #else
  163.             if ( ( * eff->h->start )( eff ) == ST_SUCCESS )
  164. #endif
  165.             {
  166.                 // Construct id
  167.                 sprintf( id, "_effect_%d_%d", count, channel );
  168.  
  169.                 // Save the effect state
  170.                 mlt_properties_set_data( MLT_FILTER_PROPERTIES( this ), id, eff, 0, effect_destructor, NULL );
  171.                 error = 0;
  172.             }
  173.         }
  174.     }
  175.     // Some error occurred so delete the temp effect state
  176.     if ( error == 1 )
  177.         effect_destructor( eff );
  178.    
  179.     mlt_tokeniser_close( tokeniser );
  180.    
  181.     return error;
  182. }
  183.  
  184. /** Get the audio.
  185. */
  186.  
  187. static int filter_get_audio( mlt_frame frame, void **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
  188. {
  189. #if (ST_LIB_VERSION_CODE >= ST_LIB_VERSION(14,3,0))
  190.     SOX_SAMPLE_LOCALS;
  191. #endif
  192.     // Get the filter service
  193.     mlt_filter filter = mlt_frame_pop_audio( frame );
  194.  
  195.     // Get the filter properties
  196.     mlt_properties filter_properties = MLT_FILTER_PROPERTIES( filter );
  197.  
  198.     // Get the properties
  199.     st_sample_t *input_buffer;// = mlt_properties_get_data( filter_properties, "input_buffer", NULL );
  200.     st_sample_t *output_buffer = mlt_properties_get_data( filter_properties, "output_buffer", NULL );
  201.     int i; // channel
  202.     int count = mlt_properties_get_int( filter_properties, "_effect_count" );
  203.  
  204.     // Get the producer's audio
  205.     *format = mlt_audio_s32;
  206.     mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
  207.  
  208.     // Even though some effects are multi-channel aware, it is not reliable
  209.     // We must maintain a separate effect state for each channel
  210.     for ( i = 0; i < *channels; i++ )
  211.     {
  212.         char id[ 256 ];
  213.         sprintf( id, "_effect_0_%d", i );
  214.        
  215.         // Get an existing effect state
  216.         eff_t e = mlt_properties_get_data( filter_properties, id, NULL );
  217.        
  218.         // Validate the existing effect state
  219. #if (ST_LIB_VERSION_CODE >= ST_LIB_VERSION(14,1,0))
  220.         if ( e != NULL && ( e->in_signal.rate != *frequency ||
  221.                             e->out_signal.rate != *frequency ) )
  222. #else
  223.         if ( e != NULL && ( e->ininfo.rate != *frequency ||
  224.                             e->outinfo.rate != *frequency ) )
  225. #endif
  226.             e = NULL;
  227.        
  228.         // (Re)Create the effect state
  229.         if ( e == NULL )
  230.         {
  231.             int j = 0;
  232.            
  233.             // Reset the count
  234.             count = 0;
  235.    
  236.             // Loop over all properties
  237.             for ( j = 0; j < mlt_properties_count( filter_properties ); j ++ )
  238.             {
  239.                 // Get the name of this property
  240.                 char *name = mlt_properties_get_name( filter_properties, j );
  241.    
  242.                 // If the name does not contain a . and matches effect
  243.                 if ( !strncmp( name, "effect", 6 ) )
  244.                 {
  245.                     // Get the effect specification
  246.                     char *value = mlt_properties_get( filter_properties, name );
  247.    
  248.                     // Create an instance
  249.                     if ( create_effect( filter, value, count, i, *frequency ) == 0 )
  250.                         count ++;
  251.                 }
  252.             }
  253.            
  254.             // Save the number of filters
  255.             mlt_properties_set_int( filter_properties, "_effect_count", count );
  256.            
  257.         }
  258.         if ( *samples > 0 && count > 0 )
  259.         {
  260.             input_buffer = (st_sample_t*) *buffer + i * *samples;
  261.             st_sample_t *p = input_buffer;
  262.             st_size_t isamp = *samples;
  263.             st_size_t osamp = *samples;
  264.             double rms = 0;
  265.             int j = *samples + 1;
  266.             char *normalise = mlt_properties_get( filter_properties, "normalise" );
  267.             double normalised_gain = 1.0;
  268.            
  269.             // Convert from interleaved
  270.             while( --j )
  271.             {
  272.                 // Compute rms amplitude while we are accessing each sample
  273.                 rms += ( double )*p * ( double )*p;
  274.                 p ++;
  275.             }
  276.            
  277.             // Compute final rms amplitude
  278.             rms = sqrt( rms / *samples / ST_SSIZE_MIN / ST_SSIZE_MIN );
  279.            
  280.             if ( normalise )
  281.             {
  282.                 int window = mlt_properties_get_int( filter_properties, "window" );
  283.                 double *smooth_buffer = mlt_properties_get_data( filter_properties, "smooth_buffer", NULL );
  284.                 double max_gain = mlt_properties_get_double( filter_properties, "max_gain" );
  285.                
  286.                 // Default the maximum gain factor to 20dBFS
  287.                 if ( max_gain == 0 )
  288.                     max_gain = 10.0;
  289.                
  290.                 // The smoothing buffer prevents radical shifts in the gain level
  291.                 if ( window > 0 && smooth_buffer != NULL )
  292.                 {
  293.                     int smooth_index = mlt_properties_get_int( filter_properties, "_smooth_index" );
  294.                     smooth_buffer[ smooth_index ] = rms;
  295.                    
  296.                     // Ignore very small values that adversely affect the mean
  297.                     if ( rms > AMPLITUDE_MIN )
  298.                         mlt_properties_set_int( filter_properties, "_smooth_index", ( smooth_index + 1 ) % window );
  299.                    
  300.                     // Smoothing is really just a mean over the past N values
  301.                     normalised_gain = AMPLITUDE_NORM / mean( smooth_buffer, window );
  302.                 }
  303.                 else if ( rms > 0 )
  304.                 {
  305.                     // Determine gain to apply as current amplitude
  306.                     normalised_gain = AMPLITUDE_NORM / rms;
  307.                 }
  308.                    
  309.                 //printf("filter_sox: rms %.3f gain %.3f\n", rms, normalised_gain );
  310.                
  311.                 // Govern the maximum gain
  312.                 if ( normalised_gain > max_gain )
  313.                     normalised_gain = max_gain;
  314.             }
  315.            
  316.             // For each effect
  317.             for ( j = 0; j < count; j++ )
  318.             {
  319.                 sprintf( id, "_effect_%d_%d", j, i );
  320.                 e = mlt_properties_get_data( filter_properties, id, NULL );
  321.                
  322.                 // We better have this guy
  323.                 if ( e != NULL )
  324.                 {
  325.                     float saved_gain = 1.0;
  326.                    
  327.                     // XXX: hack to apply the normalised gain level to the vol effect
  328. #ifdef SOX14
  329.                     if ( normalise && strcmp( e->handler.name, "vol" ) == 0 )
  330. #else
  331.                     if ( normalise && strcmp( e->name, "vol" ) == 0 )
  332. #endif
  333.                     {
  334.                         float *f = ( float * )( e->priv );
  335.                         saved_gain = *f;
  336.                         *f = saved_gain * normalised_gain;
  337.                     }
  338.                    
  339.                     // Apply the effect
  340. #ifdef SOX14
  341.                     if ( ( * e->handler.flow )( e, input_buffer, output_buffer, &isamp, &osamp ) != ST_SUCCESS )
  342. #else
  343.                     if ( ( * e->h->flow )( e, input_buffer, output_buffer, &isamp, &osamp ) != ST_SUCCESS )
  344. #endif
  345.                     {
  346.                         mlt_log_warning( MLT_FILTER_SERVICE(filter), "effect processing failed\n" );
  347.                     }
  348.                    
  349.                     // XXX: hack to restore the original vol gain to prevent accumulation
  350. #ifdef SOX14
  351.                     if ( normalise && strcmp( e->handler.name, "vol" ) == 0 )
  352. #else
  353.                     if ( normalise && strcmp( e->name, "vol" ) == 0 )
  354. #endif
  355.                     {
  356.                         float *f = ( float * )( e->priv );
  357.                         *f = saved_gain;
  358.                     }
  359.                 }
  360.             }
  361.  
  362.             // Write back
  363.             memcpy( input_buffer, output_buffer, *samples * sizeof(st_sample_t) );
  364.         }
  365.     }
  366.  
  367.     return 0;
  368. }
  369.  
  370. /** Filter processing.
  371. */
  372.  
  373. static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
  374. {
  375.     if ( mlt_frame_is_test_audio( frame ) == 0 )
  376.     {
  377.         // Add the filter to the frame
  378.         mlt_frame_push_audio( frame, this );
  379.         mlt_frame_push_audio( frame, filter_get_audio );
  380.        
  381.         // Parse the window property and allocate smoothing buffer if needed
  382.         mlt_properties properties = MLT_FILTER_PROPERTIES( this );
  383.         int window = mlt_properties_get_int( properties, "window" );
  384.         if ( mlt_properties_get( properties, "smooth_buffer" ) == NULL && window > 1 )
  385.         {
  386.             // Create a smoothing buffer for the calculated "max power" of frame of audio used in normalisation
  387.             double *smooth_buffer = (double*) calloc( window, sizeof( double ) );
  388.             int i;
  389.             for ( i = 0; i < window; i++ )
  390.                 smooth_buffer[ i ] = -1.0;
  391.             mlt_properties_set_data( properties, "smooth_buffer", smooth_buffer, 0, free, NULL );
  392.         }
  393.     }
  394.  
  395.     return frame;
  396. }
  397.  
  398. /** Constructor for the filter.
  399. */
  400.  
  401. mlt_filter filter_sox_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
  402. {
  403.     mlt_filter this = mlt_filter_new( );
  404.     if ( this != NULL )
  405.     {
  406.         void *input_buffer = mlt_pool_alloc( BUFFER_LEN );
  407.         void *output_buffer = mlt_pool_alloc( BUFFER_LEN );
  408.         mlt_properties properties = MLT_FILTER_PROPERTIES( this );
  409.        
  410.         this->process = filter_process;
  411.        
  412.         if ( arg != NULL )
  413.             mlt_properties_set( properties, "effect", arg );
  414.         mlt_properties_set_data( properties, "input_buffer", input_buffer, BUFFER_LEN, mlt_pool_release, NULL );
  415.         mlt_properties_set_data( properties, "output_buffer", output_buffer, BUFFER_LEN, mlt_pool_release, NULL );
  416.         mlt_properties_set_int( properties, "window", 75 );
  417.     }
  418.     return this;
  419. }
  420.  
  421. // What to do when a libst internal failure occurs
  422. void cleanup(void){}
  423.  
  424. // Is there a build problem with my sox-devel package?
  425. #ifndef gsm_create
  426. void gsm_create(void){}
  427. #endif
  428. #ifndef gsm_decode
  429. void gsm_decode(void){}
  430. #endif
  431. #ifndef gdm_encode
  432. void gsm_encode(void){}
  433. #endif
  434. #ifndef gsm_destroy
  435. void gsm_destroy(void){}
  436. #endif
  437. #ifndef gsm_option
  438. void gsm_option(void){}
  439. #endif
Add Comment
Please, Sign In to add comment
Public Pastes
We use cookies for various purposes including analytics. By continuing to use Pastebin, you agree to our use of cookies as described in the Cookies Policy.  OK, I Understand
Not a member of Pastebin yet?
Sign Up, it unlocks many cool features!