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redream
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added option to enable/disable the audio backend

This commit is contained in:
Anthony Pesch 2017-02-14 00:05:49 -08:00
parent c38a8725c7
commit 26fc11b9d2
3 changed files with 31 additions and 19 deletions
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6
docs/_docs/running.md
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@ -13,9 +13,9 @@ Command line flags are loaded from and saved to `$HOME/.redream/flags` each run.
``` ```
--bios Path to BIOS [default: dc_boot.bin] --bios Path to BIOS [default: dc_boot.bin]
--flash Path to flash ROM [default: dc_flash.bin] --flash Path to flash ROM [default: dc_flash.bin]
--latency Set preferred audio latency in MS [default: 100] --audio Enable audio [default: 1]
--controller Path to controller profile --latency Preferred audio latency in MS [default: 100]
--throttle Throttle emulation speed to match the original hardware [default: 1] --profile Path to controller profile
--verbose Enable debug logging [default: 0] --verbose Enable debug logging [default: 0]
--perf Write perf-compatible maps for generated code [default: 0] --perf Write perf-compatible maps for generated code [default: 0]
--gdb Start GDB debug server [default: 0] --gdb Start GDB debug server [default: 0]

2
src/audio/soundio_backend.c
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@ -2,7 +2,7 @@
#include "audio/audio_backend.h" #include "audio/audio_backend.h"
#include "hw/aica/aica.h" #include "hw/aica/aica.h"
DEFINE_OPTION_INT(latency, 100, "Set preferred audio latency in MS"); DEFINE_OPTION_INT(latency, 100, "Preferred audio latency in MS");
struct audio_backend { struct audio_backend {
struct aica *aica; struct aica *aica;

42
src/emu/emulator.c
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@ -19,6 +19,8 @@
DEFINE_AGGREGATE_COUNTER(frames); DEFINE_AGGREGATE_COUNTER(frames);
DEFINE_OPTION_INT(audio, 1, "Enable audio");
struct emu { struct emu {
struct window *window; struct window *window;
struct window_listener listener; struct window_listener listener;
@ -145,12 +147,15 @@ static void emu_close(void *data) {
static void *emu_core_thread(void *data) { static void *emu_core_thread(void *data) {
struct emu *emu = data; struct emu *emu = data;
struct audio_backend *audio = audio_create(emu->dc->aica); struct audio_backend *audio = NULL;
if (!audio) { if (OPTION_audio) {
LOG_WARNING("Audio backend creation failed"); audio = audio_create(emu->dc->aica);
emu->running = 0;
return 0; if (!audio) {
LOG_WARNING("Audio backend creation failed");
goto exit;
}
} }
static const int64_t MACHINE_STEP = HZ_TO_NANO(1000); static const int64_t MACHINE_STEP = HZ_TO_NANO(1000);
@ -158,22 +163,29 @@ static void *emu_core_thread(void *data) {
int64_t next_pump_time = 0; int64_t next_pump_time = 0;
while (emu->running) { while (emu->running) {
while (audio_buffer_low(audio) && emu->running) { /* run a slice of dreamcast time if the available audio is running low. this
effectively synchronizes the emulation speed with the host audio clock.
note however, if audio is disabled, the emulator will run as fast as
possible */
if (!audio || audio_buffer_low(audio)) {
dc_tick(emu->dc, MACHINE_STEP); dc_tick(emu->dc, MACHINE_STEP);
}
current_time = time_nanoseconds(); /* update profiler stats */
current_time = time_nanoseconds();
prof_update(current_time);
prof_update(current_time); /* check audio events (device connect / disconnect, etc.) infrequently */
if (audio && current_time > next_pump_time) {
/* audio events are just for device connections, check infrequently */ audio_pump_events(audio);
if (current_time > next_pump_time) { next_pump_time = current_time + NS_PER_SEC;
audio_pump_events(audio);
next_pump_time = current_time + NS_PER_SEC;
}
} }
} }
audio_destroy(audio); exit:
if (audio) {
audio_destroy(audio);
}
emu->running = 0; emu->running = 0;