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RetroArch/audio/audio_driver.c

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/* RetroArch - A frontend for libretro.
* Copyright (C) 2010-2014 - Hans-Kristian Arntzen
* Copyright (C) 2011-2015 - Daniel De Matteis
*
* RetroArch is free software: you can redistribute it and/or modify it under the terms
* of the GNU General Public License as published by the Free Software Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with RetroArch.
* If not, see <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include <string/string_list.h>
#include "audio_driver.h"
#include "audio_utils.h"
#include "audio_thread_wrapper.h"
#include "../driver.h"
#include "../general.h"
#include "../retroarch.h"
static const audio_driver_t *audio_drivers[] = {
#ifdef HAVE_ALSA
&audio_alsa,
#ifndef __QNX__
&audio_alsathread,
#endif
#endif
#if defined(HAVE_OSS) || defined(HAVE_OSS_BSD)
&audio_oss,
#endif
#ifdef HAVE_RSOUND
&audio_rsound,
#endif
#ifdef HAVE_COREAUDIO
&audio_coreaudio,
#endif
#ifdef HAVE_AL
&audio_openal,
#endif
#ifdef HAVE_SL
&audio_opensl,
#endif
#ifdef HAVE_ROAR
&audio_roar,
#endif
#ifdef HAVE_JACK
&audio_jack,
#endif
#if defined(HAVE_SDL) || defined(HAVE_SDL2)
&audio_sdl,
#endif
#ifdef HAVE_XAUDIO
&audio_xa,
#endif
#ifdef HAVE_DSOUND
&audio_dsound,
#endif
#ifdef HAVE_PULSE
&audio_pulse,
#endif
#ifdef __CELLOS_LV2__
&audio_ps3,
#endif
#ifdef XENON
&audio_xenon360,
#endif
#ifdef GEKKO
&audio_gx,
#endif
#ifdef EMSCRIPTEN
&audio_rwebaudio,
#endif
#ifdef PSP
&audio_psp1,
#endif
&audio_null,
NULL,
};
/**
* compute_audio_buffer_statistics:
*
* Computes audio buffer statistics.
*
**/
static void compute_audio_buffer_statistics(void)
{
unsigned i, low_water_size, high_water_size, avg, stddev;
float avg_filled, deviation;
uint64_t accum = 0, accum_var = 0;
unsigned low_water_count = 0, high_water_count = 0;
unsigned samples = min(g_extern.measure_data.buffer_free_samples_count,
AUDIO_BUFFER_FREE_SAMPLES_COUNT);
if (samples < 3)
return;
for (i = 1; i < samples; i++)
accum += g_extern.measure_data.buffer_free_samples[i];
avg = accum / (samples - 1);
for (i = 1; i < samples; i++)
{
int diff = avg - g_extern.measure_data.buffer_free_samples[i];
accum_var += diff * diff;
}
stddev = (unsigned)sqrt((double)accum_var / (samples - 2));
avg_filled = 1.0f - (float)avg / g_extern.audio_data.driver_buffer_size;
deviation = (float)stddev / g_extern.audio_data.driver_buffer_size;
low_water_size = g_extern.audio_data.driver_buffer_size * 3 / 4;
high_water_size = g_extern.audio_data.driver_buffer_size / 4;
for (i = 1; i < samples; i++)
{
if (g_extern.measure_data.buffer_free_samples[i] >= low_water_size)
low_water_count++;
else if (g_extern.measure_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 - 1),
(100.0 * high_water_count) / (samples - 1));
}
/**
* audio_driver_find_handle:
* @idx : index of driver to get handle to.
*
* Returns: handle to audio driver at index. Can be NULL
* if nothing found.
**/
const void *audio_driver_find_handle(int idx)
{
const void *drv = audio_drivers[idx];
if (!drv)
return NULL;
return drv;
}
/**
* audio_driver_find_ident:
* @idx : index of driver to get handle to.
*
* Returns: Human-readable identifier of audio driver at index. Can be NULL
* if nothing found.
**/
const char *audio_driver_find_ident(int idx)
{
const audio_driver_t *drv = audio_drivers[idx];
if (!drv)
return NULL;
return drv->ident;
}
/**
* config_get_audio_driver_options:
*
* Get an enumerated list of all audio driver names, separated by '|'.
*
* Returns: string listing of all audio driver names, separated by '|'.
**/
const char* config_get_audio_driver_options(void)
{
union string_list_elem_attr attr;
unsigned i;
char *options = NULL;
int options_len = 0;
struct string_list *options_l = string_list_new();
attr.i = 0;
if (!options_l)
return NULL;
for (i = 0; audio_driver_find_handle(i); i++)
{
const char *opt = audio_driver_find_ident(i);
options_len += strlen(opt) + 1;
string_list_append(options_l, opt, attr);
}
options = (char*)calloc(options_len, sizeof(char));
if (!options)
{
string_list_free(options_l);
options_l = NULL;
return NULL;
}
string_list_join_concat(options, options_len, options_l, "|");
string_list_free(options_l);
options_l = NULL;
return options;
}
void find_audio_driver(void)
{
int i = find_driver_index("audio_driver", g_settings.audio.driver);
if (i >= 0)
driver.audio = (const audio_driver_t*)audio_driver_find_handle(i);
else
{
unsigned d;
RARCH_ERR("Couldn't find any audio driver named \"%s\"\n",
g_settings.audio.driver);
RARCH_LOG_OUTPUT("Available audio drivers are:\n");
for (d = 0; audio_driver_find_handle(d); d++)
RARCH_LOG_OUTPUT("\t%s\n", audio_driver_find_ident(d));
RARCH_WARN("Going to default to first audio driver...\n");
driver.audio = (const audio_driver_t*)audio_driver_find_handle(0);
if (!driver.audio)
rarch_fail(1, "find_audio_driver()");
}
}
void uninit_audio(void)
{
if (driver.audio_data && driver.audio)
driver.audio->free(driver.audio_data);
free(g_extern.audio_data.conv_outsamples);
g_extern.audio_data.conv_outsamples = NULL;
g_extern.audio_data.data_ptr = 0;
free(g_extern.audio_data.rewind_buf);
g_extern.audio_data.rewind_buf = NULL;
if (!g_settings.audio.enable)
{
driver.audio_active = false;
return;
}
rarch_resampler_freep(&driver.resampler,
&driver.resampler_data);
free(g_extern.audio_data.data);
g_extern.audio_data.data = NULL;
free(g_extern.audio_data.outsamples);
g_extern.audio_data.outsamples = NULL;
rarch_main_command(RARCH_CMD_DSP_FILTER_DEINIT);
compute_audio_buffer_statistics();
}
void init_audio(void)
{
size_t outsamples_max, max_bufsamples = AUDIO_CHUNK_SIZE_NONBLOCKING * 2;
audio_convert_init_simd();
/* Resource leaks will follow if audio is initialized twice. */
if (driver.audio_data)
return;
/* Accomodate rewind since at some point we might have two full buffers. */
outsamples_max = max_bufsamples * AUDIO_MAX_RATIO *
g_settings.slowmotion_ratio;
/* Used for recording even if audio isn't enabled. */
rarch_assert(g_extern.audio_data.conv_outsamples =
(int16_t*)malloc(outsamples_max * sizeof(int16_t)));
g_extern.audio_data.block_chunk_size = AUDIO_CHUNK_SIZE_BLOCKING;
g_extern.audio_data.nonblock_chunk_size = AUDIO_CHUNK_SIZE_NONBLOCKING;
g_extern.audio_data.chunk_size =
g_extern.audio_data.block_chunk_size;
/* Needs to be able to hold full content of a full max_bufsamples
* in addition to its own. */
rarch_assert(g_extern.audio_data.rewind_buf = (int16_t*)
malloc(max_bufsamples * sizeof(int16_t)));
g_extern.audio_data.rewind_size = max_bufsamples;
if (!g_settings.audio.enable)
{
driver.audio_active = false;
return;
}
find_audio_driver();
#ifdef HAVE_THREADS
if (g_extern.system.audio_callback.callback)
{
RARCH_LOG("Starting threaded audio driver ...\n");
if (!rarch_threaded_audio_init(&driver.audio, &driver.audio_data,
*g_settings.audio.device ? g_settings.audio.device : NULL,
g_settings.audio.out_rate, g_settings.audio.latency,
driver.audio))
{
RARCH_ERR("Cannot open threaded audio driver ... Exiting ...\n");
rarch_fail(1, "init_audio()");
}
}
else
#endif
{
driver.audio_data = driver.audio->init(*g_settings.audio.device ?
g_settings.audio.device : NULL,
g_settings.audio.out_rate, g_settings.audio.latency);
}
if (!driver.audio_data)
{
RARCH_ERR("Failed to initialize audio driver. Will continue without audio.\n");
driver.audio_active = false;
}
g_extern.audio_data.use_float = false;
if (driver.audio_active && driver.audio->use_float(driver.audio_data))
g_extern.audio_data.use_float = true;
if (!g_settings.audio.sync && driver.audio_active)
{
rarch_main_command(RARCH_CMD_AUDIO_SET_NONBLOCKING_STATE);
g_extern.audio_data.chunk_size =
g_extern.audio_data.nonblock_chunk_size;
}
if (g_extern.audio_data.in_rate <= 0.0f)
{
/* Should never happen. */
RARCH_WARN("Input rate is invalid (%.3f Hz). Using output rate (%u Hz).\n",
g_extern.audio_data.in_rate, g_settings.audio.out_rate);
g_extern.audio_data.in_rate = g_settings.audio.out_rate;
}
g_extern.audio_data.orig_src_ratio =
g_extern.audio_data.src_ratio =
(double)g_settings.audio.out_rate / g_extern.audio_data.in_rate;
if (!rarch_resampler_realloc(&driver.resampler_data,
&driver.resampler,
g_settings.audio.resampler, g_extern.audio_data.orig_src_ratio))
{
RARCH_ERR("Failed to initialize resampler \"%s\".\n",
g_settings.audio.resampler);
driver.audio_active = false;
}
rarch_assert(g_extern.audio_data.data = (float*)
malloc(max_bufsamples * sizeof(float)));
g_extern.audio_data.data_ptr = 0;
rarch_assert(g_settings.audio.out_rate <
g_extern.audio_data.in_rate * AUDIO_MAX_RATIO);
rarch_assert(g_extern.audio_data.outsamples = (float*)
malloc(outsamples_max * sizeof(float)));
g_extern.audio_data.rate_control = false;
if (!g_extern.system.audio_callback.callback && driver.audio_active &&
g_settings.audio.rate_control)
{
if (driver.audio->buffer_size && driver.audio->write_avail)
{
g_extern.audio_data.driver_buffer_size =
driver.audio->buffer_size(driver.audio_data);
g_extern.audio_data.rate_control = true;
}
else
RARCH_WARN("Audio rate control was desired, but driver does not support needed features.\n");
}
rarch_main_command(RARCH_CMD_DSP_FILTER_DEINIT);
g_extern.measure_data.buffer_free_samples_count = 0;
if (driver.audio_active && !g_settings.audio.mute_enable &&
g_extern.system.audio_callback.callback)
{
/* Threaded driver is initially stopped. */
driver.audio->start(driver.audio_data);
}
}
bool audio_driver_mute_toggle(void)
{
if (!driver.audio_data || !driver.audio_active)
return false;
g_settings.audio.mute_enable = !g_settings.audio.mute_enable;
if (g_settings.audio.mute_enable)
rarch_main_command(RARCH_CMD_AUDIO_STOP);
else if (!rarch_main_command(RARCH_CMD_AUDIO_START))
{
driver.audio_active = false;
return false;
}
return true;
}
/*
* audio_driver_readjust_input_rate:
*
* Readjust the audio input rate.
*/
void audio_driver_readjust_input_rate(void)
{
double direction, adjust;
int half_size, delta_mid, avail;
unsigned write_idx;
avail = driver.audio->write_avail(driver.audio_data);
#if 0
RARCH_LOG_OUTPUT("Audio buffer is %u%% full\n",
(unsigned)(100 - (avail * 100) / g_extern.audio_data.driver_buffer_size));
#endif
write_idx = g_extern.measure_data.buffer_free_samples_count++ &
(AUDIO_BUFFER_FREE_SAMPLES_COUNT - 1);
half_size = g_extern.audio_data.driver_buffer_size / 2;
delta_mid = avail - half_size;
direction = (double)delta_mid / half_size;
adjust = 1.0 + g_settings.audio.rate_control_delta * direction;
g_extern.measure_data.buffer_free_samples[write_idx] = avail;
g_extern.audio_data.src_ratio = g_extern.audio_data.orig_src_ratio * adjust;
#if 0
RARCH_LOG_OUTPUT("New rate: %lf, Orig rate: %lf\n",
g_extern.audio_data.src_ratio, g_extern.audio_data.orig_src_ratio);
#endif
}
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