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Add audio buffer statistics measurement.

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This commit is contained in:
Themaister 2013-01-18 10:38:43 +01:00
parent df9cc5653d
commit 019959a012
3 changed files with 55 additions and 0 deletions
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48
driver.c
View File

@ -434,6 +434,52 @@ void init_audio(void)
#ifdef HAVE_DYLIB
init_dsp_plugin();
#endif
g_extern.audio_data.buffer_free_samples_count = 0;
}
static void compute_audio_buffer_statistics(void)
{
unsigned samples = min(g_extern.audio_data.buffer_free_samples_count, AUDIO_BUFFER_FREE_SAMPLES_COUNT);
if (!samples)
return;
uint64_t accum = 0;
for (unsigned i = 0; i < samples; i++)
accum += g_extern.audio_data.buffer_free_samples[i];
int avg = accum / samples;
uint64_t accum_var = 0;
for (unsigned i = 0; i < samples; i++)
{
int diff = avg - g_extern.audio_data.buffer_free_samples[i];
accum_var += diff * diff;
}
unsigned stddev = (unsigned)sqrtf((float)accum_var / samples);
float avg_filled = 1.0f - (float)avg / g_extern.audio_data.driver_buffer_size;
float deviation = (float)stddev / g_extern.audio_data.driver_buffer_size;
unsigned low_water_size = g_extern.audio_data.driver_buffer_size * 3 / 4;
unsigned high_water_size = g_extern.audio_data.driver_buffer_size / 4;
unsigned low_water_count = 0;
unsigned high_water_count = 0;
for (unsigned i = 0; i < samples; i++)
{
if (g_extern.audio_data.buffer_free_samples[i] >= low_water_size)
low_water_count++;
else if (g_extern.audio_data.buffer_free_samples[i] <= high_water_size)
high_water_count++;
}
RARCH_LOG("Average audio buffer saturation: %.2f %%, standard deviation (percentage points): %.2f %%.\n",
avg_filled * 100.0, deviation * 100.0);
RARCH_LOG("Amount of time spent close to underrun: %.2f %%. Close to blocking: %.2f %%.\n",
(100.0 * low_water_count) / samples,
(100.0 * high_water_count) / samples);
}
void uninit_audio(void)
@ -466,6 +512,8 @@ void uninit_audio(void)
#ifdef HAVE_DYLIB
deinit_dsp_plugin();
#endif
compute_audio_buffer_statistics();
}
#ifdef HAVE_DYLIB

4
general.h
View File

@ -401,6 +401,10 @@ struct global
float volume_db;
float volume_gain;
#define AUDIO_BUFFER_FREE_SAMPLES_COUNT (8 * 1024)
unsigned buffer_free_samples[AUDIO_BUFFER_FREE_SAMPLES_COUNT];
uint64_t buffer_free_samples_count;
} audio_data;
struct

3
retroarch.c
View File

@ -182,6 +182,9 @@ static void readjust_audio_input_rate(void)
//RARCH_LOG_OUTPUT("Audio buffer is %u%% full\n",
// (unsigned)(100 - (avail * 100) / g_extern.audio_data.driver_buffer_size));
unsigned write_index = (g_extern.audio_data.buffer_free_samples_count++) & (AUDIO_BUFFER_FREE_SAMPLES_COUNT - 1);
g_extern.audio_data.buffer_free_samples[write_index] = avail;
int half_size = g_extern.audio_data.driver_buffer_size / 2;
int delta_mid = avail - half_size;
double direction = (double)delta_mid / half_size;