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https://github.com/MiyooCFW/buildroot.git
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e1c37564d6
* PKG: optimize `lr-scummvm-legacy` - reduce number of linked engines (only LITE+ & no WIP) - cap framerate & increase audio_buffer (lr-option) * PKG: optimize `lr-scummvm` - disable Tooltip - reduce engines count (inline with standalone) - cap framerate->15Hz & samplerate-> 44100Hz (increase cursor speed)
117 lines
3.6 KiB
Diff
117 lines
3.6 KiB
Diff
From 3eb8564fd92ae2939275a40ea67c3475dadd431b Mon Sep 17 00:00:00 2001
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From: Apaczer <94932128+Apaczer@users.noreply.github.com>
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Date: Mon, 10 Feb 2025 21:28:33 +0100
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Subject: [PATCH 3/3] LIBRETRO: add "Framerate cap" option to reduce audio
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stutter
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via MM+ and: https://github.com/StupidHoroscope/libretro-scummvm-miyoo-backend/commit/6c3954f916bf430e7756afd8ca74618d48b56744
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---
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backends/platform/libretro/libretro.cpp | 32 +++++++++++++++++--
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.../platform/libretro/libretro_core_options.h | 19 +++++++++++
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2 files changed, 48 insertions(+), 3 deletions(-)
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diff --git a/backends/platform/libretro/libretro.cpp b/backends/platform/libretro/libretro.cpp
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index 3a5bf84b4bc..1668182774b 100644
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--- a/backends/platform/libretro/libretro.cpp
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+++ b/backends/platform/libretro/libretro.cpp
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@@ -55,6 +55,10 @@ static bool analog_response_is_quadratic = false;
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static float mouse_speed = 1.0f;
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static bool speed_hack_is_enabled = false;
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+static int cap_fps=50u;
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+
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+static size_t audio_buffer_length = 0;
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+static uint32* audio_buffer = NULL;
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char cmd_params[20][200];
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char cmd_params_num;
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@@ -144,6 +148,11 @@ void retro_init (void)
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void retro_deinit(void)
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{
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+ if (audio_buffer != NULL)
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+ {
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+ delete [] audio_buffer;
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+ audio_buffer = NULL;
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+ }
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}
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void parse_command_params(char* cmdline)
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@@ -258,6 +267,13 @@ static void update_variables(void)
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if (strcmp(var.value, "enabled") == 0)
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speed_hack_is_enabled = true;
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}
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+ var.key = "scummvm_audio_cap_fps";
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+ var.value = NULL;
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+ cap_fps = 50u;
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+ if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
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+ {
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+ cap_fps = (int)atof(var.value);
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+ }
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}
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static int retro_device = RETRO_DEVICE_JOYPAD;
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@@ -463,8 +479,18 @@ void retro_run (void)
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video_cb(screen.pixels, screen.w, screen.h, screen.pitch);
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/* Upload audio */
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- static uint32 buf[735];
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- int count = ((Audio::MixerImpl*)g_system->getMixer())->mixCallback((byte*)buf, 735*4);
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+ // HACK: Reduce audio buffer under-run by capping framerate to lower value.
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+ int samples_per_frame = 44100u / (cap_fps);
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+ if (audio_buffer == NULL || samples_per_frame != audio_buffer_length)
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+ {
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+ if (audio_buffer != NULL)
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+ {
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+ delete [] audio_buffer;
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+ }
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+ audio_buffer_length = samples_per_frame;
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+ audio_buffer = new uint32[audio_buffer_length];
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+ }
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+ int count = ((Audio::MixerImpl*)g_system->getMixer())->mixCallback((byte*)audio_buffer, audio_buffer_length*4);
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#if defined(_3DS)
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/* Hack: 3DS will produce static noise
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* unless we manually send a zeroed
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@@ -478,7 +504,7 @@ void retro_run (void)
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}
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else
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#endif
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- audio_batch_cb((int16_t*)buf, count);
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+ audio_batch_cb((int16_t*)audio_buffer, count);
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}
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#if defined(USE_LIBCO)
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diff --git a/backends/platform/libretro/libretro_core_options.h b/backends/platform/libretro/libretro_core_options.h
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index 0fbd01e86d8..a32c0e37529 100644
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--- a/backends/platform/libretro/libretro_core_options.h
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+++ b/backends/platform/libretro/libretro_core_options.h
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@@ -138,6 +138,25 @@ struct retro_core_option_definition option_defs_us[] = {
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"disabled"
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#endif
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},
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+ {
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+ "scummvm_audio_cap_fps",
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+ "Framerate cap",
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+ "Lock max framerate on resource-intensive games, to reduce audio crackling",
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+ {
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+ { "15", NULL },
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+ { "20", NULL },
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+ { "25", NULL },
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+ { "30", NULL },
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+ { "35", NULL },
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+ { "40", NULL },
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+ { "45", NULL },
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+ { "50", NULL },
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+ { "55", NULL },
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+ { "60", NULL },
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+ { NULL, NULL },
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+ },
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+ "50"
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+ },
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{ NULL, NULL, NULL, {{0}}, NULL },
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};
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--
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2.45.2.windows.1
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