New vu meter visualization.

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/visualization/visual/effects.c

@@ -39,6 +39,10 @@
 
 #define PEAK_SPEED 1
 
+#define GRAD_ANGLE_MIN 0.2
+#define GRAD_ANGLE_MAX 0.5
+#define GRAD_INCR 0.01
+
 /*****************************************************************************
  * dummy_Run
  *****************************************************************************/
@@ -828,3 +832,139 @@ int scope_Run(visual_effect_t * p_effect, aout_instance_t *p_aout,
         }
         return 0;
 }
+
+
+/*****************************************************************************
+ * vuMeter_Run: scope effect
+ *****************************************************************************/
+int vuMeter_Run(visual_effect_t * p_effect, aout_instance_t *p_aout,
+              aout_buffer_t * p_buffer , picture_t * p_picture)
+{
+        VLC_UNUSED(p_aout);
+        int i, j;
+        float *p_sample = (float *)p_buffer->p_buffer;
+        float i_value_l = 0;
+        float i_value_r = 0;
+        float ch;
+
+        /* Compute the peack values */
+        for ( i = 0 ; i < 1024; i++ )
+        {
+                ch = (*p_sample++) * 256;
+                if (ch > i_value_l)
+                        i_value_l = ch;
+
+                ch = (*p_sample++) * 256;
+                if (ch > i_value_r)
+                        i_value_r = ch;
+        }
+
+        i_value_l = abs(i_value_l);
+        i_value_r = abs(i_value_r);
+
+        /* Stay under maximum value admited */
+        if ( i_value_l > 200 * M_PI_2 )
+                i_value_l = 200 * M_PI_2;
+        if ( i_value_r > 200 * M_PI_2 )
+                i_value_r = 200 * M_PI_2;
+
+        float *i_value;
+
+        if( !p_effect->p_data )
+        {
+                /* Allocate memory to save hand positions */
+                p_effect->p_data = (void *)malloc( 2 * sizeof(float) );
+                i_value = p_effect->p_data;
+                i_value[0] = i_value_l;
+                i_value[1] = i_value_r;
+        }
+        else
+        {
+                /* Make the hands go down slowly if the current values are slower
+                than the previous */
+                i_value = p_effect->p_data;
+
+                if ( i_value_l > i_value[0] - 6 )
+                        i_value[0] = i_value_l;
+                else
+                        i_value[0] = i_value[0] - 6;
+
+                if ( i_value_r > i_value[1] - 6 )
+                        i_value[1] = i_value_r;
+                else
+                        i_value[1] = i_value[1] - 6;
+        }
+
+        int x, y, k;
+        float teta;
+        float teta_grad;
+
+        for ( j = 0; j < 2; j++ )
+        {
+                /* Draw the two scales */
+                k = 0;
+                teta_grad = GRAD_ANGLE_MIN;
+                for ( teta = -M_PI_4; teta <= M_PI_4; teta = teta + 0.001 )
+                {
+                        for ( i = 140; i <= 150; i++ )
+                        {
+                                y = i * cos(teta) + 20;
+                                x = i * sin(teta) + 150 + 240 * j;
+                                /* Compute the last color for the gradation */
+                                if (teta >= teta_grad + GRAD_INCR && teta_grad <= GRAD_ANGLE_MAX)
+                                {
+                                        teta_grad = teta_grad + GRAD_INCR;
+                                        k = k + 5;
+                                }
+                                *(p_picture->p[0].p_pixels +
+                                 (p_picture->p[0].i_lines - y - 1 ) * p_picture->p[0].i_pitch
+                                 + x ) = 0x45;
+                                *(p_picture->p[1].p_pixels +
+                                 (p_picture->p[1].i_lines - y / 2 - 1 ) * p_picture->p[1].i_pitch
+                                 + x / 2 ) = 0x0;
+                                *(p_picture->p[2].p_pixels +
+                                 (p_picture->p[2].i_lines - y / 2 - 1 ) * p_picture->p[2].i_pitch
+                                 + x / 2 ) = 0x4D + k;
+                        }
+                }
+
+                /* Draw the two hands */
+                teta = (float)i_value[j] / 200 - M_PI_4;
+                for ( i = 0; i <= 150; i++ )
+                {
+                        y = i * cos(teta) + 20;
+                        x = i * sin(teta) + 150 + 240 * j;
+                        *(p_picture->p[0].p_pixels +
+                         (p_picture->p[0].i_lines - y - 1 ) * p_picture->p[0].i_pitch
+                         + x ) = 0xAD;
+                        *(p_picture->p[1].p_pixels +
+                         (p_picture->p[1].i_lines - y / 2 - 1 ) * p_picture->p[1].i_pitch
+                         + x / 2 ) = 0xFC;
+                        *(p_picture->p[2].p_pixels +
+                         (p_picture->p[2].i_lines - y / 2 - 1 ) * p_picture->p[2].i_pitch
+                         + x / 2 ) = 0xAC;
+                }
+
+                /* Draw the hand bases */
+                for ( teta = -M_PI_2; teta <= M_PI_2 + 0.01; teta = teta + 0.001 )
+                {
+                        for ( i = 0; i < 10; i++ )
+                        {
+                                y = i * cos(teta) + 20;
+                                x = i * sin(teta) + 150 + 240 * j;
+                                *(p_picture->p[0].p_pixels +
+                                 (p_picture->p[0].i_lines - y - 1 ) * p_picture->p[0].i_pitch
+                                 + x ) = 0xFF;
+                                *(p_picture->p[1].p_pixels +
+                                 (p_picture->p[1].i_lines - y / 2 - 1 ) * p_picture->p[1].i_pitch
+                                 + x / 2 ) = 0x80;
+                                *(p_picture->p[2].p_pixels +
+                                 (p_picture->p[2].i_lines - y / 2 - 1 ) * p_picture->p[2].i_pitch
+                                 + x / 2 ) = 0x80;
+                        }
+                }
+
+        }
+
+        return 0;
+}

modules/visualization/visual/visual.c

@@ -175,6 +175,7 @@ static struct
 } pf_effect_run[]=
 {
     { "scope",      scope_Run },
+    { "vuMeter",    vuMeter_Run },
     { "spectrum",   spectrum_Run },
     { "spectrometer",   spectrometer_Run },
     { "dummy",      dummy_Run},

modules/visualization/visual/visual.h

@@ -55,6 +55,8 @@ typedef struct aout_filter_sys_t
 /* Prototypes */
 int scope_Run
         (visual_effect_t * , aout_instance_t *, aout_buffer_t *, picture_t *);
+int vuMeter_Run
+        (visual_effect_t * , aout_instance_t *, aout_buffer_t *, picture_t *);
 int dummy_Run
         (visual_effect_t * , aout_instance_t *, aout_buffer_t *, picture_t *);
 int random_Run

src/audio_output/input.c

@@ -99,6 +99,8 @@ int aout_InputNew( aout_instance_t * p_aout, aout_input_t * p_input )
         var_Change( p_aout, "visual", VLC_VAR_ADDCHOICE, &val, &text );
         val.psz_string = (char*)"spectrum"; text.psz_string = _("Spectrum");
         var_Change( p_aout, "visual", VLC_VAR_ADDCHOICE, &val, &text );
+        val.psz_string = (char*)"vuMeter"; text.psz_string = _("Vu meter");
+        var_Change( p_aout, "visual", VLC_VAR_ADDCHOICE, &val, &text );
 
         /* Look for goom plugin */
         if( module_Exists( VLC_OBJECT(p_aout), "goom" ) )