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00027 #include <stdlib.h>
00028 #include <string.h>
00029
00030 #include <vlc/vlc.h>
00031 #include "audio_output.h"
00032 #include "aout_internal.h"
00033
00034
00035
00036
00037 static int Create ( vlc_object_t * );
00038
00039 static void FixedToFloat ( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
00040 aout_buffer_t * );
00041 static void FloatToFixed ( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
00042 aout_buffer_t * );
00043
00044
00045
00046
00047 vlc_module_begin();
00048 set_category( CAT_AUDIO );
00049 set_subcategory( SUBCAT_AUDIO_MISC );
00050 set_description( _("audio filter for fixed32<->float32 conversion") );
00051 set_capability( "audio filter", 10 );
00052 set_callbacks( Create, NULL );
00053 vlc_module_end();
00054
00055
00056
00057
00058
00059
00060 static int Create( vlc_object_t *p_this )
00061 {
00062 aout_filter_t * p_filter = (aout_filter_t *)p_this;
00063
00064 if( ( p_filter->input.i_format != VLC_FOURCC('f','i','3','2')
00065 || p_filter->output.i_format != VLC_FOURCC('f','l','3','2') )
00066 && ( p_filter->input.i_format != VLC_FOURCC('f','l','3','2')
00067 || p_filter->output.i_format != VLC_FOURCC('f','i','3','2') ) )
00068 {
00069 return -1;
00070 }
00071
00072 if ( !AOUT_FMTS_SIMILAR( &p_filter->input, &p_filter->output ) )
00073 {
00074 return -1;
00075 }
00076
00077 if( p_filter->input.i_format == VLC_FOURCC('f','i','3','2') )
00078 {
00079 p_filter->pf_do_work = FixedToFloat;
00080 }
00081 else
00082 {
00083 p_filter->pf_do_work = FloatToFixed;
00084 }
00085
00086 p_filter->b_in_place = 1;
00087
00088 return 0;
00089 }
00090
00091
00092
00093
00094 static void FixedToFloat( aout_instance_t * p_aout, aout_filter_t * p_filter,
00095 aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
00096 {
00097 int i;
00098 vlc_fixed_t * p_in = (vlc_fixed_t *)p_in_buf->p_buffer;
00099 float * p_out = (float *)p_out_buf->p_buffer;
00100
00101 for ( i = p_in_buf->i_nb_samples
00102 * aout_FormatNbChannels( &p_filter->input ) ; i-- ; )
00103 {
00104 *p_out++ = (float)*p_in++ / (float)FIXED32_ONE;
00105 }
00106
00107 p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
00108 p_out_buf->i_nb_bytes = p_in_buf->i_nb_bytes;
00109 }
00110
00111
00112
00113
00114 static void FloatToFixed( aout_instance_t * p_aout, aout_filter_t * p_filter,
00115 aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
00116 {
00117 int i;
00118 float * p_in = (float *)p_in_buf->p_buffer;
00119 vlc_fixed_t * p_out = (vlc_fixed_t *)p_out_buf->p_buffer;
00120
00121 for ( i = p_in_buf->i_nb_samples
00122 * aout_FormatNbChannels( &p_filter->input ) ; i-- ; )
00123 {
00124 *p_out++ = (vlc_fixed_t)( *p_in++ * (float)FIXED32_ONE );
00125 }
00126
00127 p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
00128 p_out_buf->i_nb_bytes = p_in_buf->i_nb_bytes;
00129 }
00130