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detector: rework detection algorithm to support 24 bit samples 

This patch modifies the dection algortihm to support
24 bit samples.

Signed-off-by: Marcin Rajwa <marcin.rajwa@linux.intel.com>
This commit is contained in:
Marcin Rajwa 2019-07-25 16:41:52 +02:00 committed by Janusz Jankowski
parent b2c6dc7425
commit 04d0a165b8
1 changed files with 16 additions and 8 deletions
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24
src/audio/detect_test.c
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@ -63,7 +63,7 @@ struct model_data {
struct comp_data {
struct sof_detect_test_config config;
struct model_data model;
int16_t activation;
int32_t activation;
uint32_t detected;
uint32_t detect_preamble; /**< current keyphrase preamble length */
uint32_t keyphrase_samples; /**< keyphrase length in samples */
@ -142,11 +142,12 @@ static void default_detect_test(struct comp_dev *dev,
struct comp_buffer *source, uint32_t frames)
{
struct comp_data *cd = comp_get_drvdata(dev);
int16_t *src;
int16_t diff;
void *src;
int32_t diff;
uint32_t count = frames; /**< Assuming single channel */
uint32_t sample;
uint16_t valid_bits = dev->params.sample_valid_bytes * 8;
const int32_t activation_threshold = cd->config.activation_threshold;
/* synthetic load */
if (cd->config.load_mips)
@ -154,14 +155,21 @@ static void default_detect_test(struct comp_dev *dev,
/* perform detection within current period */
for (sample = 0; sample < count && !cd->detected; ++sample) {
src = buffer_read_frag_s16(source, sample);
diff = abs(*src) - abs(cd->activation);
diff >>= cd->config.activation_shift;
src = (valid_bits == 16U) ?
buffer_read_frag_s16(source, sample) :
buffer_read_frag_s32(source, sample);
if (valid_bits > 16U) {
diff = abs(*(int32_t *)src) - abs(cd->activation);
} else {
diff = abs(*(int16_t *)src) -
abs((int16_t)cd->activation);
}
diff >>= cd->config.activation_shift;
cd->activation += diff;
if (cd->detect_preamble >= cd->keyphrase_samples) {
if (cd->activation >= cd->config.activation_threshold) {
if (cd->activation >= activation_threshold) {
/* The algorithm shall use cd->history_depth
* to specify its draining size request.
* Zero value means default config value