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Try fixing race condition in fftw by adding mutex for fftw_* function calls suggested here: http://www.fftw.org/fftw3_doc/Thread-safety.html. Updates #4643.

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This commit is contained in:
Andreas 2014-12-07 14:07:53 +01:00
parent 0f1b29a523
commit b5567a7b27
1 changed files with 16 additions and 0 deletions
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16
gst/moodbar/gstfastspectrum.cpp
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@ -19,6 +19,8 @@
* Boston, MA 02110-1301, USA.
*/
#include <QMutex>
#include <cstring>
#include <cmath>
#include "gstfastspectrum.h"
@ -48,6 +50,8 @@ enum {
PROP_BANDS
};
static QMutex fftw_mutex;
#define gst_fastspectrum_parent_class parent_class
G_DEFINE_TYPE (GstFastSpectrum, gst_fastspectrum, GST_TYPE_AUDIO_FILTER);
@ -123,6 +127,8 @@ gst_fastspectrum_init (GstFastSpectrum * spectrum)
static void
gst_fastspectrum_alloc_channel_data (GstFastSpectrum * spectrum)
{
fftw_mutex.lock();
guint bands = spectrum->bands;
guint nfft = 2 * bands - 2;
@ -139,12 +145,16 @@ gst_fastspectrum_alloc_channel_data (GstFastSpectrum * spectrum)
spectrum->fft_output,
FFTW_ESTIMATE);
spectrum->channel_data_initialised = true;
fftw_mutex.unlock();
}
static void
gst_fastspectrum_free_channel_data (GstFastSpectrum * spectrum)
{
if (spectrum->channel_data_initialised) {
fftw_mutex.lock();
fftw_destroy_plan(spectrum->plan);
fftw_free(spectrum->fft_input);
fftw_free(spectrum->fft_output);
@ -152,6 +162,8 @@ gst_fastspectrum_free_channel_data (GstFastSpectrum * spectrum)
delete[] spectrum->spect_magnitude;
spectrum->channel_data_initialised = false;
fftw_mutex.unlock();
}
}
@ -373,6 +385,8 @@ gst_fastspectrum_run_fft (GstFastSpectrum * spectrum, guint input_pos)
guint bands = spectrum->bands;
guint nfft = 2 * bands - 2;
fftw_mutex.lock();
for (i = 0; i < nfft; i++)
spectrum->fft_input[i] =
spectrum->input_ring_buffer[(input_pos + i) % nfft];
@ -387,6 +401,8 @@ gst_fastspectrum_run_fft (GstFastSpectrum * spectrum, guint input_pos)
val /= nfft * nfft;
spectrum->spect_magnitude[i] += val;
}
fftw_mutex.unlock();
}
static GstFlowReturn