unsigned current_gain;
/** Points to the configuration data for this instance of the compress filter. */
struct compress_filter_args_info *conf;
- /** Minimal admissible gain. */
- unsigned min_gain;
/** Maximal admissible gain. */
unsigned max_gain;
/** Number of samples already seen. */
/* be careful in that heat, my dear */
int sample = *ip++, adjusted_sample;
- if (sample > 0) {
- adjusted_sample = (sample * pcd->current_gain)
- >> gain_shift;
- if (unlikely(adjusted_sample > 32767)) {
- adjusted_sample = 32767;
- pcd->current_gain = (3 * pcd->current_gain +
- (1 << pcd->conf->inertia_arg)) / 4;
- pcd->peak = 0;
- } else
- if (adjusted_sample > pcd->peak)
- pcd->peak = adjusted_sample;
- } else {
- adjusted_sample = -((-sample * pcd->current_gain)
- >> gain_shift);
- if (unlikely(adjusted_sample < -32768)) {
- adjusted_sample = -32768;
- pcd->current_gain = (3 * pcd->current_gain +
- (1 << pcd->conf->inertia_arg)) / 4;
- pcd->peak = 0;
- } else
- if (-adjusted_sample > pcd->peak)
- pcd->peak = -adjusted_sample;
- }
- *op++ = adjusted_sample;
+ adjusted_sample = (PARA_ABS(sample) * pcd->current_gain)
+ >> gain_shift;
+ if (unlikely(adjusted_sample > 32767)) { /* clip */
+ PARA_NOTICE_LOG("clip: sample: %d, adjusted sample: %d\n",
+ sample, adjusted_sample);
+ adjusted_sample = 32767;
+ pcd->current_gain = (3 * pcd->current_gain +
+ (1 << pcd->conf->inertia_arg)) / 4;
+ pcd->peak = 0;
+ } else
+ pcd->peak = PARA_MAX(pcd->peak, adjusted_sample);
+ *op++ = sample >= 0? adjusted_sample : -adjusted_sample;
if (likely(++pcd->num_samples & mask))
continue;
+// PARA_DEBUG_LOG("gain: %u, peak: %u\n", pcd->current_gain,
+// pcd->peak);
if (pcd->peak < pcd->conf->target_level_arg) {
if (pcd->current_gain < pcd->max_gain)
pcd->current_gain++;
- } else {
- if (pcd->current_gain > pcd->min_gain + 1)
- pcd->current_gain -= 2;
- }
-// PARA_DEBUG_LOG("gain: %lu, peak: %d\n", pcd->current_gain,
-// pcd->peak);
+ } else
+ pcd->current_gain = PARA_MAX(pcd->current_gain - 2,
+ 1 << pcd->conf->inertia_arg);
pcd->peak = 0;
-// PARA_INFO_LOG("sample: %lu\n", ABS(sample));
}
fn->loaded += length;
return length;
fn->bufsize = COMPRESS_CHUNK_SIZE;
fn->buf = para_malloc(fn->bufsize);
pcd->current_gain = 1 << pcd->conf->inertia_arg;
- pcd->min_gain = 1 << (pcd->conf->inertia_arg - pcd->conf->aggressiveness_arg);
pcd->max_gain = 1 << (pcd->conf->inertia_arg + pcd->conf->aggressiveness_arg);
}