MeowOS-For-R3P2/patch_v2/ncm_app/app/play/player_manager.c

/* play/player_manager.c — 播放线程：URL 获取(全档表逐级降级)→缓存(命中直接播/否则流式落盘)→
 * minimp3/dr_flac 解码→audio_out 直写。UI 不卡（网络+解码全在此线程）。
 *
 * 模型：一个持久的播放线程。外层循环取「目标曲目」，run_song() 负责一首歌的
 *   「下载(缓冲) → 解码 → 输出 → 结束/被指令打断」。暂停=冻结（停读停写停推 pos，状态置 PAUSED）；
 *   seek=seek 解码器+重开输出到目标 ms（flac 精确帧/mp3 字节 offset 近似）；下一/上一首=打断当前 run_song 返回外层。
 * 所有跨线程共享状态在 g_play (mu)。g_st.ctx 的 device_id/cookie/cache 在播放期间稳定（登出会先停播）。
 * 返回码/错误经 g_play.err/errmsg 供 UI 提示。
 * §19：解码经 decoder.c 按 magic 分发（fLaC→dr_flac / 其它→minimp3）；rate/ch/bits 按实际流
 *   给 audio_out（flac ≤16bit→S16，>16bit→S32；audiod 格式归一/DAC 原生率跟随在服务端）；
 *   音频缓存键 = 歌曲ID+音质档位（用户定案 NCM_CACHE_DESIGN §2.5），旧无档位键温和兼容。
 * §20：音质体系全量——用户档超会员权限不硬拒（钳顶后逐级降级，eff_level 回填供播放页
 *   「已降级至 xx」标注；下一首回到用户档）；fee∈{1,4} 且非会员 → NCM_ERR_VIP 不发请求。
 */
#include "../ncm_app_internal.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include "decoder.h"

static pthread_t g_thr;
static int       g_thr_on;
static int       g_want_run = 1;     /* 线程运行标志（quit=0） */
#define PCM_CHUNK_FRAMES 4096        /* 每块帧数（≈旧 8192 样本/双声道） */

/* ---- 线程内部一次性歌的状态 ---- */
static char      g_path[512];        /* 本地音频路径（缓存，mp3/flac） */
static int64_t   g_file_bytes;
static int       g_level;            /* 音质档（来自设置） */
static int       g_cache_gb;

/* 被抢占回调（SDK 读线程分发；audiod 后开流赢）：走 g_play 命令通道暂停（内部持锁），
 * 不直接动锁外状态。恢复时 audio_out_pause(0) 会检测流死并自动重开（见 audio_out.c）。 */
static void on_audio_preempt(const char *by_app, void *ctx)
{
    (void)ctx;
    meow_log(MEOW_LOG_WARN, "play: preempted by [%s] -> pause", (by_app && by_app[0]) ? by_app : "?");
    player_manager_pause(1);
}

int player_manager_state(void) { int s; pthread_mutex_lock(&g_play.mu); s = g_play.state; pthread_mutex_unlock(&g_play.mu); return s; }
int player_manager_playing_song(void) { int s; pthread_mutex_lock(&g_play.mu); s = g_play.cur_song; pthread_mutex_unlock(&g_play.mu); return s; }
int64_t player_manager_pos_ms(void) { int64_t p; pthread_mutex_lock(&g_play.mu); p = g_play.pos_ms; pthread_mutex_unlock(&g_play.mu); return p; }
int64_t player_manager_dur_ms(void) { int64_t d; pthread_mutex_lock(&g_play.mu); d = g_play.dur_ms; pthread_mutex_unlock(&g_play.mu); return d; }
int player_manager_error(void) { int e; pthread_mutex_lock(&g_play.mu); e = g_play.err; pthread_mutex_unlock(&g_play.mu); return e; }

/* 实际生效音质档（§20）：下载时由 song_url_auto 回填；缓存命中按 ext 推断；-1=未定。 */
int player_manager_eff_level(void) { int e; pthread_mutex_lock(&g_play.mu); e = g_play.eff_level; pthread_mutex_unlock(&g_play.mu); return e; }

/* 本曲下载进度（UI 缓冲反馈，§18）。total=0 表示未知（song_url 未给 size / 缓存命中）。 */
void player_manager_dl(int64_t *done, int64_t *total)
{
    pthread_mutex_lock(&g_play.mu);
    if (done)  *done  = g_play.dl_done;
    if (total) *total = g_play.dl_total;
    pthread_mutex_unlock(&g_play.mu);
}

/* 播放曲快照（REPORT §17）：run_song 起播时物化并拷入 g_play.play_song（mu 保护），
 * 之后播放/歌词/IPC/UI 一律读快照——窗口滑出当前播放曲不影响播放，不许崩。 */
int player_manager_current_song(ncm_song_t *out)
{
    if (!out) return -1;
    pthread_mutex_lock(&g_play.mu);
    int ok = g_play.play_song_valid;
    if (ok) *out = g_play.play_song;
    pthread_mutex_unlock(&g_play.mu);
    return ok ? 0 : -1;
}

void player_manager_set_quality(int level, int cache_gb)
{
    g_level = level;
    g_cache_gb = cache_gb;
    pthread_mutex_lock(&g_play.mu);
    g_play.err = 0;
    ncm_cache_set_limit_gb(&g_st.ctx.cache, cache_gb);
    pthread_mutex_unlock(&g_play.mu);
}

void player_manager_play(int song_idx)
{
    pthread_mutex_lock(&g_play.mu);
    g_play.cur_song = song_idx;
    g_play.cmd = 0;
    g_play.state = NCM_PC_BUFFER;
    g_play.pos_ms = 0;
    g_play.err = 0;             /* 新播放意图清旧错误（UI 错误条随新点歌消失） */
    g_play.dl_done = 0;
    g_play.dl_total = 0;
    g_play.seq++;
    g_play.eff_level = -1;      /* 新播放意图：生效档未定（song_local_file 回填） */
    pthread_mutex_unlock(&g_play.mu);
}

void player_manager_pause(int on)
{
    pthread_mutex_lock(&g_play.mu);
    if (on) { if (g_play.state == NCM_PC_PLAYING) g_play.state = NCM_PC_PAUSED; }
    else    { if (g_play.state == NCM_PC_PAUSED)  g_play.state = NCM_PC_PLAYING; }
    pthread_mutex_unlock(&g_play.mu);
}

void player_manager_seek(int64_t ms)
{
    pthread_mutex_lock(&g_play.mu);
    g_play.cmd = NCM_CTL_SEEK;
    g_play.cmd_seek_ms = ms;
    pthread_mutex_unlock(&g_play.mu);
}

void player_manager_next(int dir)
{
    pthread_mutex_lock(&g_play.mu);
    int c = g_play.cur_song + dir;
    if (c < 0) c = 0;
    if (c >= g_st.track_ids_count) c = g_st.track_ids_count - 1;   /* 滑窗：边界=全量索引数 */
    if (c != g_play.cur_song) {
        g_play.cur_song = c;
        g_play.cmd = 0;
        g_play.state = NCM_PC_BUFFER;
        g_play.pos_ms = 0;
        g_play.err = 0;
        g_play.dl_done = 0;
        g_play.dl_total = 0;
        g_play.seq++;
        g_play.eff_level = -1;    /* 切歌：生效档随新曲重估（下首恢复用户档，§20） */
    }
    pthread_mutex_unlock(&g_play.mu);
}

void player_manager_stop(void)
{
    pthread_mutex_lock(&g_play.mu);
    g_play.cur_song = -1;
    g_play.state = NCM_PC_STOPPED;
    g_play.pos_ms = 0;
    g_play.play_song_valid = 0;     /* 快照失效 */
    g_play.seq++;
    pthread_mutex_unlock(&g_play.mu);
}

/* ---- 每首歌的播放体（在外层循环内调用）---- */
static int download_cb(void *ctx, const unsigned char *data, size_t len)
{
    /* 下载进度反馈（UI「缓冲中… N%」，§18）：回调在播放线程，锁内仅累加。 */
    pthread_mutex_lock(&g_play.mu);
    g_play.dl_done += (int64_t)len;
    pthread_mutex_unlock(&g_play.mu);
    return ncm_cache_write((ncm_cache_writer_t *)ctx, data, len);
}

/* 缓存键（用户定案 NCM_CACHE_DESIGN §2.5）：歌曲ID + 音质档位 → "song_<id>_<level>.<ext>"。
 * 同歌同档命中不重复下载；换档=新条目，旧档留给 LRU 自然淘汰。
 * §20：键后缀用 ncm_api_level_key（sky 与 sky_c51 可区分）。 */
static void audio_cache_key(char *out, size_t sz, const char *id, int level)
{
    snprintf(out, sz, "%s_%s", id, ncm_api_level_key(level));
}

/* 得到本地音频路径 + 文件大小。命中缓存直接返回；否则 URL 降级 + 流式落缓存。
 * 返回 NCM_OK 或负错误码。s 为播放曲快照（run_song 物化，与窗口解耦 §17）。
 * §20 权限/会员：
 *   - fee 门禁（BIZ_NOTES §3 社区口径）：fee∈{1,4}（VIP 才能听/付费专）且当前非会员
 *     → 直接 NCM_ERR_VIP，**不发 song_url 请求**（省一次请求，防风控）；fee=0/8 放行
 *     （8=免费听低音质，播放允许）。本地缓存命中优先于门禁（缓存可播不拦）。
 *   - VIP 档上限：用户档超会员权限不硬拒，播放时先钳到会员允许的最高档再逐级降级
 *     （免去注定空 URL 的高档请求）；实际生效档回填 g_play.eff_level。 */
static int song_local_file(const ncm_song_t *s, char *path, size_t psz, int64_t *bytes)
{
    const char *id = s->id;
    char key[64];
    audio_cache_key(key, sizeof key, id, g_level);

    /* 缓存命中 → 离线直接播（新键两扩展名都试；档位=用户设定档，降级产物也归该档键） */
    if (ncm_cache_lookup(&g_st.ctx.cache, key, "flac", path, psz) == NCM_OK ||
        ncm_cache_lookup(&g_st.ctx.cache, key, "mp3",  path, psz) == NCM_OK) {
        struct stat st;
        if (stat(path, &st) == 0) {
            *bytes = (int64_t)st.st_size;
            /* 生效档推断（缓存键=用户档，降级产物归用户档键，无法精确还原）：
             * mp3 实体 + 用户档 > 极高 → 必为降级产物，标 EXHIGH；其余按用户档显示。
             * （flac 实体视为与用户档一致；hires→lossless 档内降级会高估显示，已知取舍。） */
            const char *dot = strrchr(path, '.');
            int eff = g_level;
            if (dot && ncm_streq(dot, "mp3") && g_level > NCM_LEVEL_EXHIGH)
                eff = NCM_LEVEL_EXHIGH;
            pthread_mutex_lock(&g_play.mu);
            g_play.eff_level = eff;
            pthread_mutex_unlock(&g_play.mu);
            return NCM_OK;
        }
    }
    /* 旧键温和兼容（§19 前存量：无档位后缀的 song_<id>[.]mp3，含历史双点名）：命中即播，
     * 不主动改名/删除，由 LRU 自然淘汰。 */
    if (ncm_cache_lookup(&g_st.ctx.cache, id, "mp3", path, psz) == NCM_OK) {
        struct stat st;
        if (stat(path, &st) == 0) {
            *bytes = (int64_t)st.st_size;
            pthread_mutex_lock(&g_play.mu);
            g_play.eff_level = (g_level > NCM_LEVEL_EXHIGH) ? NCM_LEVEL_EXHIGH : g_level;
            pthread_mutex_unlock(&g_play.mu);
            return NCM_OK;
        }
    }

    /* fee 门禁：VIP 才能听（1=VIP 歌曲 / 4=付费数字专辑）且非会员 → 不请求 url。
     * （必须在缓存查找之后：已缓存的过期/下架曲本地可播，NCM_CACHE_DESIGN §2.4。） */
    if ((s->fee == 1 || s->fee == 4) && account_vip() < NCM_VIP_CVIP)
        return NCM_ERR_VIP;

    /* 播放地址：用户档先按会员权限钳顶，再逐档降级（§20 全档表），接受 mp3 与 flac */
    int want = g_level;
    int vip_cap = account_level_cap();
    if (want > vip_cap) want = vip_cap;
    ncm_play_url_t u;
    int eff = -1;
    int rc = ncm_api_song_url_auto(g_st.ctx.device_id, g_st.ctx.cookie, id, want, &u, &eff);
    if (rc != NCM_OK) return rc;
    if (!u.url[0]) return NCM_ERR_NOTFOUND;
    pthread_mutex_lock(&g_play.mu);
    g_play.eff_level = (eff >= 0) ? eff : want;
    pthread_mutex_unlock(&g_play.mu);
    /* 落盘扩展名：type 权威；type 缺失时看 url 扩展名，默认 mp3 */
    const char *ext = "mp3";
    if (ncm_streq(u.type, "flac")) ext = "flac";
    else if (!u.type[0] && strstr(u.url, ".flac")) ext = "flac";
    pthread_mutex_lock(&g_play.mu);
    g_play.dl_total = (u.size > 0) ? u.size : 0;   /* 缓冲进度% 分母（0=未知只转菊花） */
    pthread_mutex_unlock(&g_play.mu);

    /* 写前检查：池大小超限先按 LRU 淘汰（此线程尚未开 temp，无在途文件被误删风险） */
    ncm_cache_evict(&g_st.ctx.cache);

    /* 流式下载到缓存 temp → commit（稳妥者：先落盘再播） */
    ncm_cache_writer_t *w = NULL;
    rc = ncm_cache_open(&g_st.ctx.cache, key, ext, &w);
    if (rc != NCM_OK) return rc;

    ncm_http_req_t req;
    memset(&req, 0, sizeof req);
    req.url = u.url;
    req.method = "GET";
    req.extra_hdrs = "User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) "
                     "AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36";
    req.verify_ca = NCM_HTTP_VERIFY_DEFAULT;
    req.timeout_ms = 30000;

    ncm_http_resp_t resp;
    /* 上限：Hi-Res flac 单曲可达数百 MB（192k/24bit 5min ≈345MB），flac 上限 1GB；mp3 维持 64MB。
     * size 可信时按 size 限幅（防超额），未知按格式默认上限。 */
    size_t cap = (ext[0] == 'f') ? (1024u << 20) : (64u << 20);
    size_t maxb = (u.size > 0 && (uint64_t)u.size < cap) ? (size_t)u.size : cap;
    rc = ncm_http_download(&req, download_cb, w, maxb, &resp);
    if (rc != NCM_OK || resp.status != 200) {
        ncm_cache_abort(w);
        return (rc != NCM_OK) ? rc : NCM_ERR_HTTP;
    }
    rc = ncm_cache_commit(w);
    if (rc != 0) return rc;
    /* 写后检查：新落盘可能把池推过上限 → 再按 LRU 淘汰最旧（刚写的 mtime 最新，存活） */
    ncm_cache_evict(&g_st.ctx.cache);
    if (ncm_cache_lookup(&g_st.ctx.cache, key, ext, path, psz) != NCM_OK)
        return NCM_ERR_NOENT;
    struct stat st;
    if (stat(path, &st) == 0) *bytes = (int64_t)st.st_size;
    return NCM_OK;
}

static void set_err(int err, const char *msg)
{
    pthread_mutex_lock(&g_play.mu);
    g_play.err = err;
    if (msg) { ncm_strlcpy(g_play.errmsg, msg, sizeof g_play.errmsg); }
    g_play.state = NCM_PC_STOPPED;
    pthread_mutex_unlock(&g_play.mu);
}

/* 切歌竞态护栏（§18）：物化/下载期间用户可能已切歌——只有仍是当前目标且处于 BUFFER
 * （本次播放意图未过期）才继续，否则直接回外层（外层会以新 cur 重跑 run_song）。 */
static int still_current(int idx)
{
    pthread_mutex_lock(&g_play.mu);
    int ok = (g_play.cur_song == idx) && (g_play.state == NCM_PC_BUFFER);
    pthread_mutex_unlock(&g_play.mu);
    return ok;
}

/* 一首歌：下载→解码→输出，直到结束或被打断。返回后由外层处理下一首。 */
static void run_song(int idx)
{
    /* §17 滑窗兼容：物化目标曲（窗内命中 / 盘缓存 / song_detail 单曲）并整体快照进
     * g_play.play_song——之后本曲所有字段读快照，窗口滑出当前播放曲不影响播放。 */
    ncm_song_t s;
    if (appstate_song_copy(idx, &s) != 0) {
        int fr = appstate_song_fetch(idx, &s);
        if (fr != NCM_OK) { set_err(fr, "load failed"); return; }
    }
    if (!still_current(idx)) return;             /* 物化期间已切歌/停止：不写过期快照 */
    pthread_mutex_lock(&g_play.mu);
    g_play.play_song = s;
    g_play.play_song_valid = 1;
    pthread_mutex_unlock(&g_play.mu);

    int64_t file_bytes = 0;
    char path[512];
    int rc = song_local_file(&s, path, sizeof path, &file_bytes);
    if (rc != NCM_OK) {
        if (!still_current(idx)) return;         /* 下载期间已切歌：静默放弃（缓存已落盘不亏） */
        const char *m = (rc == NCM_ERR_VIP)      ? "VIP only (fee gate)"
                      : (rc == NCM_ERR_NOTFOUND) ? "no stream (VIP/copyright)"
                      : (rc == NCM_ERR_AUTH)     ? "session expired" : "load failed";
        set_err(rc, m);
        return;
    }
    if (!still_current(idx)) return;             /* 下载完成但已切歌：勿开解码/勿动状态 */
    ncm_strlcpy(g_path, path, sizeof g_path);
    g_file_bytes = file_bytes;

    int64_t dur = s.duration_ms > 0 ? s.duration_ms : 0;

    /* 解码分发（§19）：magic 探测 fLaC→dr_flac / 其它→minimp3；rate/ch/bits 按实际流。 */
    ncm_decoder_t *dec = NULL;
    int rate = 0, ch = 0, bits = 0;
    int64_t total_frames = 0;
    if (ncm_dec_open(&dec, path, &rate, &ch, &bits, &total_frames) != 0) {
        set_err(NCM_ERR_IO, "decode open failed"); return;
    }
    if (dur <= 0 && total_frames > 0 && rate > 0) dur = total_frames * 1000 / rate;

    /* 音频输出：按实际流参数开（flac ≤16bit→S16，>16bit→S32；audiod 侧格式归一+原生率跟随） */
    if (audio_out_open(rate, ch, bits) != 0) {
        ncm_dec_close(dec); set_err(NCM_ERR_IO, "audio open failed"); return;
    }

    /* 状态→播放 */
    pthread_mutex_lock(&g_play.mu);
    g_play.state = NCM_PC_PLAYING;
    g_play.pos_ms = 0;
    g_play.dur_ms = dur;
    g_play.err = 0;
    pthread_mutex_unlock(&g_play.mu);
    meow_log(MEOW_LOG_INFO, "play: start idx=%d id=%s fmt=%s %dHz/%dch/%dbit dur=%lldms level=%s eff=%s",
             idx, s.id, ncm_dec_format(dec), rate, ch, bits, (long long)dur,
             ncm_api_level_key(g_level), ncm_api_level_key(g_play.eff_level >= 0 ? g_play.eff_level : g_level));

    /* 单块缓冲：4096 帧 × ≤2ch × 4B（S32 上限）= 32KB，静态（播放线程单实例，省 32KB 栈）。 */
    static int32_t pcm[PCM_CHUNK_FRAMES * 2];
    int64_t frames_done = 0;          /* 已输出帧（每通道） */
    int need_seek_ms = -1;
    int paused_edge = 0;              /* 暂停沿：进暂停已向 audiod 发 pause */

    for (;;) {
        if (g_app_quit) break;

        /* 取命令 */
        pthread_mutex_lock(&g_play.mu);
        int cmd = g_play.cmd; g_play.cmd = 0;
        int64_t seek_ms = g_play.cmd_seek_ms;
        int cur = g_play.cur_song;
        int st  = g_play.state;
        pthread_mutex_unlock(&g_play.mu);

        if (cur != idx) { meow_log(MEOW_LOG_INFO, "play: switch idx=%d -> %d", idx, cur); break; }   /* 切歌 → 回外层 */
        if (st == NCM_PC_STOPPED) { meow_log(MEOW_LOG_INFO, "play: stopped idx=%d", idx); break; }

        if (cmd == NCM_CTL_SEEK && seek_ms >= 0) { need_seek_ms = (int)seek_ms; }

        if (st == NCM_PC_PAUSED) {
            if (!paused_edge) {     /* 进暂停：停 PCM 时钟但不丢流（audiod MSG_AUDIO_PAUSE） */
                paused_edge = 1;
                meow_log(MEOW_LOG_INFO, "play: paused idx=%d pos=%lldms", idx,
                         rate > 0 ? (long long)(frames_done * 1000 / rate) : 0);
                audio_out_pause(1);
            }
            usleep(40 * 1000);
            continue;               /* 冻结 */
        }
        if (paused_edge) {          /* 出暂停：恢复 audiod 流（流死则自动重开） */
            paused_edge = 0;
            meow_log(MEOW_LOG_INFO, "play: resumed idx=%d", idx);
            if (audio_out_pause(0) != 0) { set_err(NCM_ERR_IO, "audio resume failed"); break; }
        }

        if (need_seek_ms >= 0) {
            /* seek：flac 精确帧 / mp3 关+重开按字节近似（decoder 内处理）；输出重开 */
            meow_log(MEOW_LOG_INFO, "play: seek idx=%d -> %dms", idx, need_seek_ms);
            audio_out_close();
            if (ncm_dec_seek_ms(dec, need_seek_ms, g_file_bytes, dur) != 0) {
                set_err(NCM_ERR_IO, "seek failed"); break;
            }
            if (audio_out_open(rate, ch, bits) != 0) { set_err(NCM_ERR_IO, "audio reopen failed"); break; }
            frames_done = (int64_t)need_seek_ms * rate / 1000;
            need_seek_ms = -1;
            continue;
        }

        int64_t frames = ncm_dec_read(dec, pcm, PCM_CHUNK_FRAMES);
        if (frames == 0) {          /* 播完 */
            meow_log(MEOW_LOG_INFO, "play: done idx=%d frames=%lld", idx, (long long)frames_done);
            break;
        }
        /* 写失败（流死/audiod 断链）：置错停播——旧版静默 break 会被外层当「自然播完」
         * 自动顺延下一首，流死时连环跳歌并狂发 song_url 请求（§18 修）。 */
        if (audio_out_write(pcm, (int)frames) != (int)frames) {
            if (!g_app_quit) set_err(NCM_ERR_IO, "audio write failed");
            break;
        }
        frames_done += frames;
        /* 更新进度（~200ms 节流）*/
        int64_t pos = rate > 0 ? frames_done * 1000 / rate : 0;
        pthread_mutex_lock(&g_play.mu);
        g_play.pos_ms = pos;
        if (dur > 0 && pos >= dur) g_play.pos_ms = dur;
        pthread_mutex_unlock(&g_play.mu);
    }

    audio_out_close();
    ncm_dec_close(dec);
    /* 若应继续播下一首且非因命令打断，由外层处理（外层见 cur==idx 且需自然结束） */
}

/* 外层播放线程循环 */
static void *player_thread(void *arg)
{
    (void)arg;
    while (g_want_run && !g_app_quit) {
        pthread_mutex_lock(&g_play.mu);
        int cur = g_play.cur_song;
        int st  = g_play.state;
        pthread_mutex_unlock(&g_play.mu);

        if (cur < 0 || cur >= g_st.track_ids_count || st == NCM_PC_STOPPED) {
            usleep(60 * 1000);
            continue;
        }
        /* 以本地快照播放（idx 被外层线程独占，无需再锁） */
        run_song(cur);

        pthread_mutex_lock(&g_play.mu);
        int cur2 = g_play.cur_song;
        int st2  = g_play.state;
        pthread_mutex_unlock(&g_play.mu);
        /* 自然播完且无新命令 → 顺延下一首；否则回到循环等待 */
        if (cur2 >= 0 && cur2 < g_st.track_ids_count && st2 != NCM_PC_STOPPED && cur2 == cur) {
            int nx = cur + 1;
            if (nx < g_st.track_ids_count) { player_manager_next(1); }
            else { player_manager_stop(); }
        } else {
            usleep(50 * 1000);
        }
    }
    return NULL;
}

/* ---- 歌词后台加载（二期）：UI 不阻塞 —— 持久 worker 监视当前播放歌曲，首播/切歌/自动顺延
 *      时在独立线程拉取并解析，UI 经 lyric_state() 判「加载中 / 无词」。 ----
 *      §17：曲目 id 改读播放快照（g_play.play_song，mu 保护），不再依赖窗口内
 *      g_st.songs[]——窗口滑出当前播放曲歌词照常。 */
static pthread_mutex_t g_lyrmu = PTHREAD_MUTEX_INITIALIZER;
static pthread_t       g_lyr_thr;
static int             g_lyr_thr_on;
static volatile int    g_lyr_state;       /* 0=空闲/未拉 1=加载中 2=已拉完 */
static char            g_lyr_song_id[24]; /* 歌词归属歌曲 id */

static void *lyric_worker(void *arg)
{
    (void)arg;
    char last_id[24] = "";
    while (!g_app_quit) {
        usleep(300 * 1000);
        char id[24];
        pthread_mutex_lock(&g_play.mu);
        int idx = g_play.cur_song;
        int have = g_play.play_song_valid;
        ncm_strlcpy(id, have ? g_play.play_song.id : "", sizeof id);
        pthread_mutex_unlock(&g_play.mu);
        if (idx < 0 || idx >= g_st.track_ids_count || !have) {
            lyric_clear();
            pthread_mutex_lock(&g_lyrmu);
            g_lyr_song_id[0] = 0;
            g_lyr_state = 0;
            pthread_mutex_unlock(&g_lyrmu);
            last_id[0] = 0;
            continue;
        }
        if (!id[0]) continue;
        if (strcmp(id, last_id) == 0) continue;      /* 同一曲已拉/在拉 */

        ncm_strlcpy(last_id, id, sizeof last_id);
        lyric_clear();
        pthread_mutex_lock(&g_lyrmu);
        g_lyr_state = 1;                              /* 加载中 */
        pthread_mutex_unlock(&g_lyrmu);

        char *lrc = (char *)malloc(64 * 1024);
        char *tl  = (char *)malloc(32 * 1024);
        if (!lrc || !tl) {
            free(lrc); free(tl);
            pthread_mutex_lock(&g_lyrmu); g_lyr_state = 0; pthread_mutex_unlock(&g_lyrmu);
            continue;
        }
        int rc = ncm_api_lyric(g_st.ctx.device_id, g_st.ctx.cookie, id, lrc, 64 * 1024, tl, 32 * 1024);
        if (rc == NCM_OK) lyric_parse(lrc, tl);
        free(lrc); free(tl);

        pthread_mutex_lock(&g_lyrmu);
        ncm_strlcpy(g_lyr_song_id, id, sizeof g_lyr_song_id);
        g_lyr_state = 2;                              /* 拉完（可能 0 行=无词） */
        pthread_mutex_unlock(&g_lyrmu);
    }
    return NULL;
}

static void lyric_ensure_worker(void)
{
    pthread_mutex_lock(&g_lyrmu);
    if (!g_lyr_thr_on) {
        g_lyr_thr_on = 1;
        if (pthread_create(&g_lyr_thr, NULL, lyric_worker, NULL) == 0) pthread_detach(g_lyr_thr);
        else g_lyr_thr_on = 0;
    }
    pthread_mutex_unlock(&g_lyrmu);
}

/* 为当前曲目「异步」拉歌词：确保后台 worker 在跑即返回（UI 不阻塞网络/解析）。
 * 实际拉取+解析在 worker 线程（约 0.3s 内开始），结束置 lyric_state()=2。 */
int player_manager_load_lyric(void)
{
    lyric_ensure_worker();
    return NCM_OK;
}

/* 歌词加载状态（UI 判「loading / no lyric」）。 */
int lyric_state(void)
{
    int s;
    pthread_mutex_lock(&g_lyrmu);
    s = g_lyr_state;
    pthread_mutex_unlock(&g_lyrmu);
    return s;
}

int player_manager_start(void)
{
    if (g_thr_on) return 0;
    g_want_run = 1;
    g_level = g_st.level;
    g_cache_gb = g_st.cache_limit_gb;
    pthread_mutex_init(&g_play.mu, NULL);
    meow_audio_on_preempt(on_audio_preempt, NULL);   /* 被抢占 → 暂停（SDK 读线程分发） */
    if (pthread_create(&g_thr, NULL, player_thread, NULL) != 0) return -1;
    g_thr_on = 1;
    return 0;
}

void player_manager_stop_thread(void)
{
    g_want_run = 0;
    g_app_quit = 1;
    audio_out_close();   /* 打断阻塞写 */
    if (g_thr_on) {
        pthread_join(g_thr, NULL);
        g_thr_on = 0;
    }
}