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> compile NEMU

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221220000 张三
Linux zzy 5.15.146.1-microsoft-standard-WSL2 #1 SMP Thu Jan 11 04:09:03 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
 14:59:07 up 4 days, 10:04,  1 user,  load average: 0.58, 0.47, 0.52
This commit is contained in:
tracer-ics2023
2024-09-21 14:59:08 +08:00
committed by zzy
parent aea2db9304
commit a523267d02
2 changed files with 34 additions and 16 deletions
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27
nemu/src/device/audio.c
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@ -17,7 +17,7 @@
#include <device/map.h>
#include <SDL2/SDL.h>
#include <stdatomic.h>
#include <threads.h>
enum {
reg_freq,
@ -32,12 +32,14 @@ enum {
static uint8_t *sbuf = NULL;
static uint32_t *audio_base = NULL;
static uint32_t pos_read = 0;
static atomic_char32_t audio_count = 0;
static uint32_t audio_count = 0;
static mtx_t mtx_audio;
#define MIN(a, b) ((a) < (b) ? (a) : (b))
static void audio_callback(void *userdata, uint8_t *stream, int len) {
uint32_t count = atomic_load(&audio_count);
mtx_lock(&mtx_audio);
uint32_t count = audio_count;
uint32_t read_cnt = MIN(count, len);
uint32_t to_end_cnt = CONFIG_SB_SIZE - pos_read;
int32_t out_bound_cnt = read_cnt - to_end_cnt;
@ -52,10 +54,14 @@ static void audio_callback(void *userdata, uint8_t *stream, int len) {
pos_read %= CONFIG_SB_SIZE;
// if (len > read_cnt) memset(stream + read_cnt, 0, len - read_cnt);
count -= read_cnt;
atomic_store(&audio_count, count);
audio_count = count;
mtx_unlock(&mtx_audio);
}
static inline void init_audio_dev() {
int ret = mtx_init(&mtx_audio, mtx_plain);
assert(ret == thrd_success);
SDL_AudioSpec s = {};
s.format = AUDIO_S16SYS; // 假设系统中音频数据的格式总是使用16位有符号数来表示
s.userdata = NULL; // 不使用
@ -81,14 +87,19 @@ static void audio_io_handler(uint32_t offset, int len, bool is_write) {
assert(is_write == false);
break;
case reg_init:
if (is_write && audio_base[reg_init] != 0) {
init_audio_dev();
if (is_write) {
if (audio_base[reg_init] & 1) init_audio_dev();
if (audio_base[reg_init] & 1 << 1) {
mtx_lock(&mtx_audio);
} else {
mtx_unlock(&mtx_audio);
}
}
break;
case reg_count:
// TODO: must be add a lock here
if (is_write) atomic_store(&audio_count, audio_base[reg_count]);
else audio_base[reg_count] = atomic_load(&audio_count);
if (is_write) audio_count = audio_base[reg_count];
else audio_base[reg_count] = audio_count;
break;
default:
assert(0);