122 lines
4.9 KiB
C
122 lines
4.9 KiB
C
/*
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* meow_ui_vol.c — SDK 状态栏音量换算纯函数 + settings.conf 读取（A-0 核心数源）。
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*
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* 单独成 TU 的目的：
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* 1. 纯函数（clamp / 键读取）不依赖 meow_ui 其它子系统，宿主 gcc 直接可测
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* （test_meow_ui_vol.c），无需链整库/stub。
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* 2. 把「音量从 settings 读数并 clamp 到 volume_max」这一语义钉死在单点，
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* 与 launcher 的 vol_clamp（audio.c）口径对齐，杜绝两端音量漂移。
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*
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* 数据源：/usr/data/meow/settings.conf 扁平 key=value。launcher meow_settings.c
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* 落盘为 "key = value"（带空格），本解析兼容无空格/多空格，与 launcher 读循环
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* 及 sdk meow_ui_theme.c 的 get_setting_str 同款解析。
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*/
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#include "meow_ui_vol.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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int meow_ui_vol_clamp(int vol, int vol_max)
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{
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if (vol < 0) vol = 0;
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if (vol > MEOW_UI_VOL_MAX) vol = MEOW_UI_VOL_MAX;
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if (vol_max < 0) vol_max = 0; /* 异常上限兜底：不进负值 */
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if (vol > vol_max) vol = vol_max;
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return vol;
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}
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int meow_ui_vol_read(const char *path, const char *key, int def)
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{
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if (!path || !key) return def;
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FILE *f = fopen(path, "r");
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if (!f) return def;
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int kl = (int)strlen(key);
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char line[160];
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char *found = NULL;
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while (fgets(line, sizeof line, f)) {
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char *eq = strchr(line, '=');
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if (!eq) continue; /* 非 key=value 行（注释/空行）跳过 */
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char *k = line;
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while (*k == ' ' || *k == '\t') k++; /* key 左去空白 */
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int n = (int)(eq - k);
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while (n > 0 && (k[n-1] == ' ' || k[n-1] == '\t')) n--; /* key 右去空白 */
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if (n != kl || strncmp(k, key, (size_t)kl) != 0) continue; /* key 不精确匹配 */
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found = eq + 1; /* 命中所求键 */
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break;
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}
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fclose(f);
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if (!found) return def;
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while (*found == ' ' || *found == '\t') found++; /* value 左去空白；atoi 天然停于非数字 */
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return atoi(found);
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}
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/* 改 settings.conf 一个 int 键：流式拷贝原文件到 <path>.tmp，命中键行改写为
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* "key = value"（launcher 落盘格式，带空格），键缺失则末尾追加；rename 原子替换。
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* 保留其余行（注释/其它设置）——绝不 O_TRUNC 整文件。 */
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int meow_ui_vol_set(const char *path, const char *key, int val)
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{
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if (!path || !path[0] || !key || !key[0]) return -1;
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FILE *in = fopen(path, "r");
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char tmp[512];
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int kl = (int)strlen(key);
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snprintf(tmp, sizeof tmp, "%s.tmp", path);
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FILE *out = fopen(tmp, "w");
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if (!out) { if (in) fclose(in); return -1; }
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int found = 0;
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char line[256];
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while (in && fgets(line, sizeof line, in)) {
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char *eq = strchr(line, '=');
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char *k = line;
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while (*k == ' ' || *k == '\t') k++;
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int n = eq ? (int)(eq - k) : 0;
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while (n > 0 && (k[n-1] == ' ' || k[n-1] == '\t')) n--;
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if (eq && n == kl && strncmp(k, key, (size_t)kl) == 0) {
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fprintf(out, "%s = %d\n", key, val); /* 命中：改写为规范格式 */
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found = 1;
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} else {
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fputs(line, out); /* 其它行原样保留 */
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}
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}
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if (in) fclose(in);
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if (!found) fprintf(out, "%s = %d\n", key, val);
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fclose(out);
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if (rename(tmp, path) != 0) { remove(tmp); return -1; }
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return 0;
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}
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/* 音量步进（系统语义，与 launcher 设置页/watchdog 同源：volume_step/volume_max 约束）。
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* 只做 settings 逻辑 + 持久化；DAC 写入由调用方（meow_ui_vol_dac_write）负责。 */
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int meow_ui_vol_step(const char *path, int dir)
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{
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int vol = meow_ui_vol_read(path, "audio.volume", MEOW_UI_VOL_DEFAULT);
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int vol_max= meow_ui_vol_read(path, "audio.volume_max", MEOW_UI_VOL_MAX_DEF);
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int step = meow_ui_vol_read(path, "audio.volume_step", 1);
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if (step < 1) step = 1;
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if (step > 5) step = 5; /* 与 watchdog 读取口径一致（1..5） */
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if (dir < 0) dir = -1;
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else if (dir > 0) dir = 1;
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else return vol;
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int v = meow_ui_vol_clamp(vol + dir * step, vol_max);
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if (v == vol) return vol; /* 已在上下限：无进展，不写 */
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meow_ui_vol_set(path, "audio.volume", v);
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return v;
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}
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/* 真实 DAC 音量（CS43198, numid 1/2, 0-255），pct→255 映射直写两声道。
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* 与 launcher meow_dac_vol_write / watchdog wd_vol_write 完全同路径（语义同源）。 */
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void meow_ui_vol_dac_write(int pct)
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{
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int dac = 255 - pct * 255 / 100; /* CS43198 寄存器=衰减量(0=最响 255=静音)，用户 pct 越大越响 → 反转映射 */
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if (dac < 0) dac = 0;
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if (dac > 255) dac = 255;
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char cmd[160];
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snprintf(cmd, sizeof cmd,
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"amixer -c 0 cset numid=1 %d >/dev/null 2>&1; amixer -c 0 cset numid=2 %d >/dev/null 2>&1",
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dac, dac);
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system(cmd);
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}
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