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gst/spectrum/gstspectrum.*: Implement a simple compensation algorithm for rounding errors.

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Original commit message from CVS:
* gst/spectrum/gstspectrum.c: (gst_spectrum_reset_state),
(gst_spectrum_transform_ip):
* gst/spectrum/gstspectrum.h:
Implement a simple compensation algorithm for rounding errors.
This makes sure that a spectrum message is posted on the bus
every interval nanoseconds. Fixes bug #567955.
This commit is contained in:
Sebastian Dröge 2009-01-19 10:13:53 +00:00
parent b5f2a609af
commit d912a42065
3 changed files with 32 additions and 2 deletions
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9
ChangeLog
View file

@ -1,3 +1,12 @@
2009-01-19 Sebastian Dröge <sebastian.droege@collabora.co.uk>
* gst/spectrum/gstspectrum.c: (gst_spectrum_reset_state),
(gst_spectrum_transform_ip):
* gst/spectrum/gstspectrum.h:
Implement a simple compensation algorithm for rounding errors.
This makes sure that a spectrum message is posted on the bus
every interval nanoseconds. Fixes bug #567955.
2009-01-15 Michael Smith <msmith@songbirdnest.com>
* sys/osxaudio/Makefile.am:

22
gst/spectrum/gstspectrum.c
View file

@ -278,6 +278,8 @@ gst_spectrum_reset_state (GstSpectrum * spectrum)
spectrum->num_frames = 0;
spectrum->num_fft = 0;
spectrum->accumulated_error = 0;
}
static void
@ -505,10 +507,12 @@ gst_spectrum_transform_ip (GstBaseTransform * trans, GstBuffer * buffer)
spectrum->fft_ctx = gst_fft_f32_new (nfft, FALSE);
spectrum->frames_per_interval =
gst_util_uint64_scale (spectrum->interval, rate, GST_SECOND);
spectrum->error_per_interval = (spectrum->interval * rate) % GST_SECOND;
if (spectrum->frames_per_interval == 0)
spectrum->frames_per_interval = 1;
spectrum->num_frames = 0;
spectrum->num_fft = 0;
spectrum->accumulated_error = 0;
}
if (spectrum->num_frames == 0)
@ -559,7 +563,12 @@ gst_spectrum_transform_ip (GstBaseTransform * trans, GstBuffer * buffer)
* FFT of frames that we already handled.
*/
if (spectrum->num_frames % nfft == 0 ||
spectrum->num_frames == spectrum->frames_per_interval) {
((spectrum->accumulated_error < GST_SECOND
&& spectrum->num_frames == spectrum->frames_per_interval)
|| (spectrum->accumulated_error >= GST_SECOND
&& spectrum->num_frames - 1 ==
spectrum->frames_per_interval))) {
for (i = 0; i < nfft; i++)
input_tmp[i] = input[(spectrum->input_pos + i) % nfft];
@ -586,7 +595,16 @@ gst_spectrum_transform_ip (GstBaseTransform * trans, GstBuffer * buffer)
}
/* Do we have the FFTs for one interval? */
if (spectrum->num_frames == spectrum->frames_per_interval) {
if ((spectrum->accumulated_error < GST_SECOND
&& spectrum->num_frames == spectrum->frames_per_interval)
|| (spectrum->accumulated_error >= GST_SECOND
&& spectrum->num_frames - 1 == spectrum->frames_per_interval)) {
if (spectrum->accumulated_error >= GST_SECOND)
spectrum->accumulated_error -= GST_SECOND;
else
spectrum->accumulated_error += spectrum->error_per_interval;
if (spectrum->message) {
GstMessage *m;

3
gst/spectrum/gstspectrum.h
View file

@ -62,6 +62,9 @@ struct _GstSpectrum
gfloat *spect_magnitude;
gfloat *spect_phase;
GstFFTF32 *fft_ctx;
guint64 error_per_interval;
guint64 accumulated_error;
};
struct _GstSpectrumClass