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spectrum: improve performance with local vars

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Use 'input' instead of 'spectrum->input' which was intende already (variable
exists, but not used everywhere). Also use a local version of
'spectrum->input_pos'.
This commit is contained in:
Stefan Kost 2010-08-11 15:45:56 +03:00
parent 8beead14d0
commit 0dca0becb2
1 changed files with 14 additions and 12 deletions
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26
gst/spectrum/gstspectrum.c
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@ -501,6 +501,7 @@ gst_spectrum_transform_ip (GstBaseTransform * trans, GstBuffer * buffer)
guint bands = spectrum->bands;
guint nfft = 2 * bands - 2;
gint threshold = spectrum->threshold;
guint input_pos;
gfloat *input;
gfloat *input_tmp;
GstFFTF32Complex *freqdata;
@ -552,28 +553,29 @@ gst_spectrum_transform_ip (GstBaseTransform * trans, GstBuffer * buffer)
spect_phase = spectrum->spect_phase;
fft_ctx = spectrum->fft_ctx;
input_pos = spectrum->input_pos;
while (size >= width * channels) {
/* Move the current frame into our ringbuffer and
* take the average of all channels
*/
spectrum->input[spectrum->input_pos] = 0.0;
input[input_pos] = 0.0;
if (fp && width == 4) {
gfloat *in = (gfloat *) data;
for (i = 0; i < channels; i++)
spectrum->input[spectrum->input_pos] += in[i];
input[input_pos] += in[i];
} else if (fp && width == 8) {
gdouble *in = (gdouble *) data;
for (i = 0; i < channels; i++)
spectrum->input[spectrum->input_pos] += in[i];
input[input_pos] += in[i];
} else if (!fp && width == 4) {
gint32 *in = (gint32 *) data;
for (i = 0; i < channels; i++)
/* max_value will be 0 when depth is 1, interpret -1 and 0
* as -1 and +1 if that's the case.
*/
spectrum->input[spectrum->input_pos] +=
max_value ? in[i] / max_value : in[i] * 2 + 1;
input[input_pos] += max_value ? in[i] / max_value : in[i] * 2 + 1;
} else if (!fp && width == 3) {
for (i = 0; i < channels; i++) {
#if G_BYTE_ORDER == G_BIG_ENDIAN
@ -583,22 +585,20 @@ gst_spectrum_transform_ip (GstBaseTransform * trans, GstBuffer * buffer)
#endif
if (value & 0x00800000)
value |= 0xff000000;
spectrum->input[spectrum->input_pos] +=
max_value ? value / max_value : value * 2 + 1;
input[input_pos] += max_value ? value / max_value : value * 2 + 1;
}
} else if (!fp && width == 2) {
gint16 *in = (gint16 *) data;
for (i = 0; i < channels; i++)
spectrum->input[spectrum->input_pos] +=
max_value ? in[i] / max_value : in[i] * 2 + 1;
input[input_pos] += max_value ? in[i] / max_value : in[i] * 2 + 1;
} else {
g_assert_not_reached ();
}
spectrum->input[spectrum->input_pos] /= channels;
input[input_pos] /= channels;
data += width * channels;
size -= width * channels;
spectrum->input_pos = (spectrum->input_pos + 1) % nfft;
input_pos = (input_pos + 1) % nfft;
spectrum->num_frames++;
have_full_interval = (
@ -616,7 +616,7 @@ gst_spectrum_transform_ip (GstBaseTransform * trans, GstBuffer * buffer)
if ((spectrum->num_frames % nfft == 0) || have_full_interval) {
for (i = 0; i < nfft; i++)
input_tmp[i] = input[(spectrum->input_pos + i) % nfft];
input_tmp[i] = input[(input_pos + i) % nfft];
gst_fft_f32_window (fft_ctx, input_tmp, GST_FFT_WINDOW_HAMMING);
@ -680,6 +680,8 @@ gst_spectrum_transform_ip (GstBaseTransform * trans, GstBuffer * buffer)
}
}
spectrum->input_pos = input_pos;
g_assert (size == 0);
return GST_FLOW_OK;