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Fixed bug on Image processing, with no video or audio present. Play() and DisplayWaveform() methods now handle not having any audio samples.

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This commit is contained in:
Jonathan Thomas
2011-10-27 11:27:44 -05:00
parent 28b9fbabd1
commit bfc05d507d
3 changed files with 77 additions and 50 deletions
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112
src/Frame.cpp
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@@ -124,70 +124,92 @@ void Frame::Display()
// Display the wave form
void Frame::DisplayWaveform(bool resize)
{
// Create black image
int width = audio->getNumSamples();
int height = 200 * audio->getNumChannels();
int height_padding = 20 * (audio->getNumChannels() - 1);
int total_height = height + height_padding;
Magick::Image wave_image(Magick::Geometry(width, total_height), Magick::Color("#000000"));
// Create blank image
Magick::Image wave_image;
// Init a list of lines
list<Magick::Drawable> lines;
lines.push_back(Magick::DrawableFillColor("#0070ff"));
lines.push_back(Magick::DrawablePointSize(16));
// Loop through each audio channel
int Y = 100;
for (int channel = 0; channel < audio->getNumChannels(); channel++)
// Calculate the width of an image based on the # of samples
int width = audio->getNumSamples();
if (width > 0)
{
// Get audio for this channel
float *samples = audio->getSampleData(channel);
// If samples are present...
int height = 200 * audio->getNumChannels();
int height_padding = 20 * (audio->getNumChannels() - 1);
int total_height = height + height_padding;
wave_image = Magick::Image(Magick::Geometry(width, total_height), Magick::Color("#000000"));
for (int sample = 0; sample < audio->getNumSamples(); sample++)
// Loop through each audio channel
int Y = 100;
for (int channel = 0; channel < audio->getNumChannels(); channel++)
{
// Sample value (scaled to -100 to 100)
float value = samples[sample] * 100;
// Get audio for this channel
float *samples = audio->getSampleData(channel);
if (value > 100 || value < -100)
cout << "TOO BIG!!! " << value << endl;
for (int sample = 0; sample < audio->getNumSamples(); sample++)
{
// Sample value (scaled to -100 to 100)
float value = samples[sample] * 100;
// Append a line segment for each sample
if (value != 0.0)
{
// LINE
lines.push_back(Magick::DrawableStrokeColor("#0070ff"));
lines.push_back(Magick::DrawableStrokeWidth(1));
lines.push_back(Magick::DrawableLine(sample,Y, sample,Y-value)); // sample=X coordinate, Y=100 is the middle
}
else
{
// DOT
lines.push_back(Magick::DrawableFillColor("#0070ff"));
lines.push_back(Magick::DrawableStrokeWidth(1));
lines.push_back(Magick::DrawablePoint(sample,Y));
if (value > 100 || value < -100)
cout << "TOO BIG!!! " << value << endl;
// Append a line segment for each sample
if (value != 0.0)
{
// LINE
lines.push_back(Magick::DrawableStrokeColor("#0070ff"));
lines.push_back(Magick::DrawableStrokeWidth(1));
lines.push_back(Magick::DrawableLine(sample,Y, sample,Y-value)); // sample=X coordinate, Y=100 is the middle
}
else
{
// DOT
lines.push_back(Magick::DrawableFillColor("#0070ff"));
lines.push_back(Magick::DrawableStrokeWidth(1));
lines.push_back(Magick::DrawablePoint(sample,Y));
}
}
// Add Channel Label
stringstream label;
label << "Channel " << channel;
lines.push_back(Magick::DrawableStrokeColor("#ffffff"));
lines.push_back(Magick::DrawableFillColor("#ffffff"));
lines.push_back(Magick::DrawableStrokeWidth(0.1));
lines.push_back(Magick::DrawableText(5, Y - 5, label.str()));
// Increment Y
Y += (200 + height_padding);
}
// Draw the waveform
wave_image.draw(lines);
// Resize Image (if requested)
if (resize)
// Resize to 60%
wave_image.resize(Magick::Geometry(width * 0.6, total_height * 0.6));
}
else
{
// No audio samples present
wave_image = Magick::Image(Magick::Geometry(720, 480), Magick::Color("#000000"));
// Add Channel Label
stringstream label;
label << "Channel " << channel;
lines.push_back(Magick::DrawableStrokeColor("#ffffff"));
lines.push_back(Magick::DrawableFillColor("#ffffff"));
lines.push_back(Magick::DrawableStrokeWidth(0.1));
lines.push_back(Magick::DrawableText(5, Y - 5, label.str()));
lines.push_back(Magick::DrawableText(265, 240, "No Audio Samples Found"));
// Increment Y
Y += (200 + height_padding);
// Draw the waveform
wave_image.draw(lines);
}
// Draw the waveform
wave_image.draw(lines);
// Resize Image (if requested)
if (resize)
// Resize to 60%
wave_image.resize(Magick::Geometry(width * 0.6, total_height * 0.6));
// Display Image
wave_image.display();
}
@@ -268,6 +290,10 @@ void Frame::AddAudio(int destChannel, int destStartSample, const float* source,
// Play audio samples for this frame
void Frame::Play()
{
// Check if samples are present
if (!audio->getNumSamples())
return;
AudioDeviceManager deviceManager;
deviceManager.initialise (0, /* number of input channels */
audio->getNumChannels(), /* number of output channels */