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Add option to change sound quality

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Reducing the sound rate can make picodrive more performant on less powerful systems such as the PSP
This commit is contained in:
bmaupin
2020-03-05 13:25:58 -05:00
parent c1ee525ac9
commit ad577afb13
2 changed files with 38 additions and 4 deletions
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29
platform/libretro/libretro.c
View File

@@ -88,7 +88,7 @@ static retro_audio_sample_batch_t audio_batch_cb;
#define VOUT_32BIT_WIDTH 256
#endif
#define VOUT_MAX_HEIGHT 240
#define SND_RATE 44100
#define INITIAL_SND_RATE 44100
static const float VOUT_PAR = 0.0;
static const float VOUT_4_3 = (224.0f * (4.0f / 3.0f));
@@ -112,7 +112,7 @@ static void *retro_palette;
static struct retro_hw_ps2_insets padding;
#endif
static short ALIGNED(4) sndBuffer[2*SND_RATE/50];
static short ALIGNED(4) sndBuffer[2*INITIAL_SND_RATE/50];
static void snd_write(int len);
@@ -635,7 +635,7 @@ void retro_get_system_av_info(struct retro_system_av_info *info)
memset(info, 0, sizeof(*info));
info->timing.fps = Pico.m.pal ? 50 : 60;
info->timing.sample_rate = SND_RATE;
info->timing.sample_rate = PicoIn.sndRate;
info->geometry.base_width = vout_width;
info->geometry.base_height = vout_height;
info->geometry.max_width = vout_width;
@@ -1301,6 +1301,7 @@ static void update_variables(void)
struct retro_variable var;
int OldPicoRegionOverride;
float old_user_vout_width;
double new_sound_rate;
var.value = NULL;
var.key = "picodrive_input1";
@@ -1440,6 +1441,20 @@ static void update_variables(void)
else
PicoIn.opt &= ~POPT_ALT_RENDERER;
}
var.value = NULL;
var.key = "picodrive_sound_rate";
if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
new_sound_rate = atoi(var.value);
if (new_sound_rate != PicoIn.sndRate) {
/* Update the sound rate */
PicoIn.sndRate = new_sound_rate;
PsndRerate(1);
struct retro_system_av_info av_info;
retro_get_system_av_info(&av_info);
environ_cb(RETRO_ENVIRONMENT_SET_SYSTEM_AV_INFO, &av_info);
}
}
}
void retro_run(void)
@@ -1602,7 +1617,13 @@ void retro_init(void)
#endif
PicoIn.opt |= POPT_EN_DRC;
#endif
PicoIn.sndRate = SND_RATE;
struct retro_variable var = { .key = "picodrive_sound_rate" };
if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
PicoIn.sndRate = atoi(var.value);
else
PicoIn.sndRate = INITIAL_SND_RATE;
PicoIn.autoRgnOrder = 0x184; // US, EU, JP
vout_width = VOUT_MAX_WIDTH;

13
platform/libretro/libretro_core_options.h
View File

@@ -213,6 +213,19 @@ struct retro_core_option_definition option_defs_us[] = {
"accurate"
},
#endif
{
"picodrive_sound_rate",
"Sound quality",
"Sound quality (in Hz). A lower value may increase performance.",
{
{ "16000", NULL },
{ "22050", NULL },
{ "32000", NULL },
{ "44100", NULL },
{ NULL, NULL },
},
"44100"
},
{ NULL, NULL, NULL, {{0}}, NULL },
};