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Create public function compute_audio_buffer_statistics

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This commit is contained in:
twinaphex 2018-03-24 12:25:52 +01:00
parent 647f1a48a6
commit 9343eacc0a
2 changed files with 55 additions and 29 deletions
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74
audio/audio_driver.c
View File

@ -146,10 +146,8 @@ static size_t audio_driver_rewind_size = 0;
static int16_t *audio_driver_rewind_buf = NULL;
static int16_t *audio_driver_output_samples_conv_buf = NULL;
#ifdef DEBUG
static unsigned audio_driver_free_samples_buf[AUDIO_BUFFER_FREE_SAMPLES_COUNT];
static uint64_t audio_driver_free_samples_count = 0;
#endif
static size_t audio_driver_buffer_size = 0;
static size_t audio_driver_data_ptr = 0;
@ -195,18 +193,15 @@ enum resampler_quality audio_driver_get_resampler_quality(void)
return (enum resampler_quality)settings->uints.audio_resampler_quality;
}
#ifdef DEBUG
/**
* compute_audio_buffer_statistics:
*
* Computes audio buffer statistics.
*
**/
static void compute_audio_buffer_statistics(void)
bool compute_audio_buffer_statistics(audio_statistics_t *stats)
{
unsigned i, low_water_size, high_water_size, avg, stddev;
float avg_filled = 0.0f;
float deviation = 0.0f;
uint64_t accum = 0;
uint64_t accum_var = 0;
unsigned low_water_count = 0;
@ -215,9 +210,21 @@ static void compute_audio_buffer_statistics(void)
(unsigned)audio_driver_free_samples_count,
AUDIO_BUFFER_FREE_SAMPLES_COUNT);
if (samples < 3)
return;
if (samples < 3 || !stats)
return false;
stats->average_buffer_saturation = 0.0;
stats->std_deviation_percentage = 0.0f;
#ifdef WARPUP
/* uint64 to double not implemented, fair chance
* signed int64 to double doesn't exist either */
/* https://forums.libretro.com/t/unsupported-platform-help/13903/ */
(void)stddev;
#elif defined(_MSC_VER) && _MSC_VER <= 1200
/* FIXME: error C2520: conversion from unsigned __int64
* to double not implemented, use signed __int64 */
(void)stddev;
#else
for (i = 1; i < samples; i++)
accum += audio_driver_free_samples_buf[i];
@ -225,24 +232,17 @@ static void compute_audio_buffer_statistics(void)
for (i = 1; i < samples; i++)
{
int diff = avg - audio_driver_free_samples_buf[i];
accum_var += diff * diff;
int diff = avg - audio_driver_free_samples_buf[i];
accum_var += diff * diff;
}
#ifdef WARPUP
/* uint64 to double not implemented, fair chance signed int64 to double doesn't exist either */
/* https://forums.libretro.com/t/unsupported-platform-help/13903/ */
(void)stddev; (void)avg_filled; (void)deviation;
#elif defined(_MSC_VER) && _MSC_VER <= 1200
/* FIXME: error C2520: conversion from unsigned __int64 to double not implemented, use signed __int64 */
(void)stddev; (void)avg_filled; (void)deviation;
#else
stddev = (unsigned)sqrt((double)accum_var / (samples - 2));
avg_filled = 1.0f - (float)avg / audio_driver_buffer_size;
deviation = (float)stddev / audio_driver_buffer_size;
stddev = (unsigned)
sqrt((double)accum_var / (samples - 2));
RARCH_LOG("[Audio]: Average audio buffer saturation: %.2f %%, standard deviation (percentage points): %.2f %%.\n",
avg_filled * 100.0, deviation * 100.0);
stats->average_buffer_saturation = (1.0f - (float)avg
/ audio_driver_buffer_size) * 100.0;
stats->std_deviation_percentage = ((float)stddev
/ audio_driver_buffer_size) * 100.0;
#endif
low_water_size = (unsigned)(audio_driver_buffer_size * 3 / 4);
@ -256,11 +256,29 @@ static void compute_audio_buffer_statistics(void)
high_water_count++;
}
RARCH_LOG("[Audio]: Amount of time spent close to underrun: %.2f %%. Close to blocking: %.2f %%.\n",
(100.0 * low_water_count) / (samples - 1),
(100.0 * high_water_count) / (samples - 1));
stats->close_to_underrun = (100.0 * low_water_count) / (samples - 1);
stats->close_to_blocking = (100.0 * high_water_count) / (samples - 1);
return true;
}
static void report_audio_buffer_statistics(void)
{
audio_statistics_t audio_stats;
if (!compute_audio_buffer_statistics(&audio_stats))
return;
#ifdef DEBUG
RARCH_LOG("[Audio]: Average audio buffer saturation: %.2f %%,"
" standard deviation (percentage points): %.2f %%.\n"
"[Audio]: Amount of time spent close to underrun: %.2f %%."
" Close to blocking: %.2f %%.\n",
audio_stats.average_buffer_saturation,
audio_stats.std_deviation_percentage,
audio_stats.close_to_underrun,
audio_stats.close_to_blocking);
#endif
}
/**
* audio_driver_find_handle:
@ -345,9 +363,7 @@ static bool audio_driver_deinit_internal(void)
command_event(CMD_EVENT_DSP_FILTER_DEINIT, NULL);
#ifdef DEBUG
compute_audio_buffer_statistics();
#endif
report_audio_buffer_statistics();
return true;
}

10
audio/audio_driver.h
View File

@ -46,6 +46,14 @@ enum audio_action
AUDIO_ACTION_MIXER
};
typedef struct audio_statistics
{
float average_buffer_saturation;
float std_deviation_percentage;
float close_to_underrun;
float close_to_blocking;
} audio_statistics_t;
typedef struct audio_driver
{
/* Creates and initializes handle to audio driver.
@ -266,6 +274,8 @@ bool audio_driver_mixer_add_stream(audio_mixer_stream_params_t *params);
enum resampler_quality audio_driver_get_resampler_quality(void);
bool compute_audio_buffer_statistics(audio_statistics_t *stats);
extern audio_driver_t audio_rsound;
extern audio_driver_t audio_oss;
extern audio_driver_t audio_alsa;