better aevalsrc inputs for spectrum previews

src/components/spectrum.py

@@ -19,7 +19,7 @@ log = logging.getLogger('AVP.Components.Spectrum')
 
 class Component(Component):
     name = 'Spectrum'
-    version = '1.0.0'
+    version = '1.0.1'
 
     def widget(self, *args):
         self.previewFrame = None
@@ -65,8 +65,17 @@ class Component(Component):
         self.changedOptions = True
 
     def update(self):
-        self.page.stackedWidget.setCurrentIndex(
-            self.page.comboBox_filterType.currentIndex())
+        filterType = self.page.comboBox_filterType.currentIndex()
+        self.page.stackedWidget.setCurrentIndex(filterType)
+        if filterType == 3:
+            self.page.spinBox_hue.setEnabled(False)
+        else:
+            self.page.spinBox_hue.setEnabled(True)
+        if filterType == 2 or filterType == 4:
+            self.page.checkBox_mono.setEnabled(False)
+        else:
+            self.page.checkBox_mono.setEnabled(True)
+
         super().update()
 
     def previewRender(self):
@@ -81,6 +90,8 @@ class Component(Component):
         frame = self.getPreviewFrame()
         self.changedOptions = False
         if not frame:
+            log.warning(
+                'Spectrum #%s failed to create a preview frame' % self.compPos)
             self.previewFrame = None
             return BlankFrame(self.width, self.height)
         else:
@@ -244,13 +255,21 @@ class Component(Component):
                 )
             )
 
+        if self.filterType < 2:
+            exampleSnd = exampleSound('freq')
+        elif self.filterType == 2 or self.filterType == 4:
+            exampleSnd = exampleSound('stereo')
+        elif self.filterType == 3:
+            exampleSnd = exampleSound('white')
+
         return [
             '-filter_complex',
             '%s%s%s%s [v1]; '
             '[v1] %s%s%s%s%s [v]' % (
-                exampleSound() if preview and genericPreview else '[0:a] ',
+                exampleSnd if preview and genericPreview else '[0:a] ',
                 'compand=gain=4,' if self.compress else '',
-                'aformat=channel_layouts=mono,' if self.mono else '',
+                'aformat=channel_layouts=mono,'
+                if self.mono and self.filterType not in (2, 4) else '',
                 filter_,
                 'hflip, ' if self.mirror else '',
                 'trim=start=%s:end=%s, ' % (
@@ -259,7 +278,8 @@ class Component(Component):
                 ) if preview else '',
                 'scale=%sx%s' % scale(
                     self.scale, self.width, self.height, str),
-                ', hue=h=%s:s=10' % str(self.hue) if self.hue > 0 else '',
+                ', hue=h=%s:s=10' % str(self.hue)
+                if self.hue > 0 and self.filterType != 3 else '',
                 ', convolution=-2 -1 0 -1 1 1 0 1 2:-2 -1 0 -1 1 1 0 1 2:-2 '
                 '-1 0 -1 1 1 0 1 2:-2 -1 0 -1 1 1 0 1 2'
                 if self.filterType == 3 else ''

src/components/waveform.py

@@ -140,13 +140,16 @@ class Component(Component):
         opacity = "{0:.1f}".format(self.opacity / 100)
         genericPreview = self.settings.value("pref_genericPreview")
         if self.mode < 3:
-            filter_ = 'showwaves=r=%s:s=%sx%s:mode=%s:colors=%s@%s:scale=%s' % (
-                self.settings.value("outputFrameRate"),
-                self.settings.value("outputWidth"),
-                self.settings.value("outputHeight"),
-                self.page.comboBox_mode.currentText().lower()
-                if self.mode != 3 else 'p2p',
-                hexcolor, opacity, amplitude,
+            filter_ = (
+                'showwaves='
+                'r=%s:s=%sx%s:mode=%s:colors=%s@%s:scale=%s' % (
+                    self.settings.value("outputFrameRate"),
+                    self.settings.value("outputWidth"),
+                    self.settings.value("outputHeight"),
+                    self.page.comboBox_mode.currentText().lower()
+                    if self.mode != 3 else 'p2p',
+                    hexcolor, opacity, amplitude,
+                )
             )
         elif self.mode > 2:
             filter_ = (
@@ -160,18 +163,20 @@ class Component(Component):
                 )
             )
 
+        baselineHeight = int(self.height * (4 / 1080))
         return [
             '-filter_complex',
             '%s%s%s'
             '%s%s%s [v1]; '
             '[v1] scale=%s:%s%s [v]' % (
-                exampleSound() if preview and genericPreview else '[0:a] ',
+                exampleSound('wave', extra='')
+                if preview and genericPreview else '[0:a] ',
                 'compand=gain=4,' if self.compress else '',
                 'aformat=channel_layouts=mono,'
                 if self.mono and self.mode < 3 else '',
                 filter_,
-                ', drawbox=x=(iw-w)/2:y=(ih-h)/2:w=iw:h=4:color=%s@%s' % (
-                    hexcolor, opacity
+                ', drawbox=x=(iw-w)/2:y=(ih-h)/2:w=iw:h=%s:color=%s@%s' % (
+                    baselineHeight, hexcolor, opacity,
                 ) if self.mode < 2 else '',
                 ', hflip' if self.mirror else'',
                 w, h,

src/toolkit/ffmpeg.py

@@ -457,8 +457,17 @@ def readAudioFile(filename, videoWorker):
     return (completeAudioArray, duration)
 
 
-def exampleSound():
-    return (
-        'aevalsrc=tan(random(1)*PI*t)*sin(random(0)*2*PI*t),'
-        'apulsator=offset_l=0.5:offset_r=0.5,'
-    )
+def exampleSound(
+    style='white', extra='apulsator=offset_l=0.35:offset_r=0.67'):
+    '''Help generate an example sound for use in creating a preview'''
+
+    if style == 'white':
+        src = '-2+random(0)'
+    elif style == 'freq':
+        src = 'sin(1000*t*PI*t)'
+    elif style == 'wave':
+        src = 'sin(random(0)*2*PI*t)*tan(random(0)*2*PI*t)'
+    elif style == 'stereo':
+        src = '0.1*sin(2*PI*(360-2.5/2)*t) : 0.1*sin(2*PI*(360+2.5/2)*t)'
+
+    return "aevalsrc='%s', %s%s" % (src, extra, ', ' if extra else '')