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Make dumping EQ filter coefficients a config option.

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This commit is contained in:
Themaister 2014-05-30 18:59:44 +02:00
parent 0488dca77a
commit 0ca79f964f
2 changed files with 24 additions and 9 deletions
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5
audio/filters/EQ.dsp
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@ -26,4 +26,9 @@ filter0 = eq
# Due to frequency domain smearing, you will not get exactly +3 dB at 1 kHz. # Due to frequency domain smearing, you will not get exactly +3 dB at 1 kHz.
# By default, this filter has a flat frequency response. # By default, this filter has a flat frequency response.
#
# Dumps the impulse response generated by the EQ as a plain-text file
# with one coefficient per line.
# eq_impulse_response_output = "eq_impulse.txt"

28
audio/filters/eq.c
View File

@ -217,7 +217,7 @@ static inline double kaiser_window(double index, double beta)
} }
static void create_filter(struct eq_data *eq, unsigned size_log2, static void create_filter(struct eq_data *eq, unsigned size_log2,
struct eq_gain *gains, unsigned num_gains, double beta) struct eq_gain *gains, unsigned num_gains, double beta, const char *filter_path)
{ {
int i; int i;
int half_block_size = eq->block_size >> 1; int half_block_size = eq->block_size >> 1;
@ -257,15 +257,16 @@ static void create_filter(struct eq_data *eq, unsigned size_log2,
} }
// Debugging. // Debugging.
#if 0 if (filter_path)
FILE *file = fopen("/tmp/test.txt", "w");
if (file)
{ {
for (i = 0; i < (int)eq->block_size - 1; i++) FILE *file = fopen(filter_path, "w");
fprintf(file, "%.6f\n", time_filter[i + 1]); if (file)
fclose(file); {
for (i = 0; i < (int)eq->block_size - 1; i++)
fprintf(file, "%.8f\n", time_filter[i + 1]);
fclose(file);
}
} }
#endif
// Padded FFT to create our FFT filter. // Padded FFT to create our FFT filter.
// Make our even-length filter odd by discarding the first coefficient. // Make our even-length filter odd by discarding the first coefficient.
@ -301,6 +302,13 @@ static void *eq_init(const struct dspfilter_info *info,
config->get_float_array(userdata, "frequencies", &frequencies, &num_freq, default_freq, 2); config->get_float_array(userdata, "frequencies", &frequencies, &num_freq, default_freq, 2);
config->get_float_array(userdata, "gains", &gain, &num_gain, default_gain, 2); config->get_float_array(userdata, "gains", &gain, &num_gain, default_gain, 2);
char *filter_path = NULL;
if (!config->get_string(userdata, "impulse_response_output", &filter_path, ""))
{
config->free(filter_path);
filter_path = NULL;
}
num_gain = num_freq = min(num_gain, num_freq); num_gain = num_freq = min(num_gain, num_freq);
gains = (struct eq_gain*)calloc(num_gain, sizeof(*gains)); gains = (struct eq_gain*)calloc(num_gain, sizeof(*gains));
@ -329,7 +337,9 @@ static void *eq_init(const struct dspfilter_info *info,
if (!eq->fft || !eq->fftblock || !eq->save || !eq->block || !eq->filter) if (!eq->fft || !eq->fftblock || !eq->save || !eq->block || !eq->filter)
goto error; goto error;
create_filter(eq, size_log2, gains, num_gain, beta); create_filter(eq, size_log2, gains, num_gain, beta, filter_path);
config->free(filter_path);
filter_path = NULL;
free(gains); free(gains);
return eq; return eq;