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

/* play/ipc_media.c — 媒体会话 IPC 最小客户端（SDK 尚无媒体封装，App 内用 meow_ipc.h 帧格式直连）。
 *
 * 连接：AF_UNIX SOCK_STREAM 到 MEOW_IPC_SOCK（缺省 /usr/data/meow_ipc.sock）。HELLO(app_id,
 * MF_PLAYBACK) 注册为媒体源；之后**同一连接**周期发 MSG_META（~1s，进度随播放推进）并阻塞等
 * launcher 下发 MSG_PLAYCTL（播放/暂停/上下曲/seek/toggle）。launcher 经该连接 fd 回发（meow_media.c
 * send_playctl 用最近活跃会话的 fd）。无 socket/launcher 不跑 → 优雅跳过（打日志不崩）。
 * 线程模型：独立线程（main 起了 meow_ui_run 阻塞；播放线程归 player_manager，本线程只做 IPC 收发）。
 */
#include "../ncm_app_internal.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <poll.h>
#include <sys/socket.h>
#include <sys/un.h>
#include "meow_ipc.h"

static pthread_t g_thr;
static int       g_thr_on;
static int       g_quit;

static const char *sock_path(void)
{
    const char *e = getenv("MEOW_IPC_SOCK");
    return (e && e[0]) ? e : MEOW_IPC_PATH;
}

static int connect_path(const char *path)
{
    int fd = socket(AF_UNIX, SOCK_STREAM, 0);
    if (fd < 0) return -1;
    struct sockaddr_un a;
    memset(&a, 0, sizeof a);
    a.sun_family = AF_UNIX;
    strncpy(a.sun_path, path, sizeof a.sun_path - 1);
    if (connect(fd, (struct sockaddr *)&a, sizeof a) < 0) { close(fd); return -1; }
    return fd;
}

/* 发送一帧（头+负载）。 */
static int send_frame(int fd, uint16_t type, uint32_t req_id, const void *payload, uint32_t len)
{
    uint8_t hdr[MEOW_IPC_HDR_LEN];
    uint32_t magic = MEOW_IPC_MAGIC;
    uint16_t ver = MEOW_IPC_VERSION;
    memcpy(hdr + 0, &magic, 4);
    memcpy(hdr + 4, &ver, 2);
    memcpy(hdr + 6, &type, 2);
    memcpy(hdr + 8, &req_id, 4);
    memcpy(hdr + 12, &len, 4);
    size_t off = 0;
    while (off < sizeof hdr) {
        ssize_t w = write(fd, hdr + off, sizeof hdr - off);
        if (w <= 0) return -1;
        off += (size_t)w;
    }
    if (len && payload) {
        off = 0;
        while (off < len) {
            ssize_t w = write(fd, (const uint8_t *)payload + off, len - off);
            if (w <= 0) return -1;
            off += (size_t)w;
        }
    }
    return 0;
}

static int read_frame(int fd, uint16_t *type, uint8_t *rbuf, uint32_t rcap)
{
    uint8_t hdr[MEOW_IPC_HDR_LEN];
    size_t off = 0;
    while (off < sizeof hdr) {
        ssize_t r = read(fd, hdr + off, sizeof hdr - off);
        if (r <= 0) return -1;
        off += (size_t)r;
    }
    uint32_t magic, len; uint16_t ver;
    memcpy(&magic, hdr, 4); memcpy(&ver, hdr + 4, 2); memcpy(type, hdr + 6, 2);
    memcpy(&len, hdr + 12, 4);
    if (magic != MEOW_IPC_MAGIC || ver != MEOW_IPC_VERSION) return -1;
    if (len > rcap) len = rcap;
    off = 0;
    while (off < len) {
        ssize_t r = read(fd, rbuf + off, len - off);
        if (r <= 0) return -1;
        off += (size_t)r;
    }
    return (int)len;
}

/* 组并发送一条 META。 */
static void send_meta(int fd, uint32_t req_id)
{
    m_meta_t mm;
    memset(&mm, 0, sizeof mm);
    ncm_strlcpy(mm.app_id, "dev.player.ncm", sizeof mm.app_id);

    int idx = player_manager_playing_song();
    pthread_mutex_lock(&g_play.mu);
    int pos = (int)g_play.pos_ms;
    int dur = (int)g_play.dur_ms;
    int state = g_play.state;
    int err = g_play.err;
    pthread_mutex_unlock(&g_play.mu);

    static char title[128], artist[128], album[128];
    title[0] = artist[0] = album[0] = 0;
    ncm_song_t sm;
    if (idx >= 0 && player_manager_current_song(&sm) == 0) {   /* 播放快照（窗口无关，§17） */
        snprintf(title, sizeof title, "%s", sm.name);
        snprintf(artist, sizeof artist, "%s", sm.art_name);
        snprintf(album, sizeof album, "%s", sm.album_name);
    }
    snprintf(mm.title, sizeof mm.title, "%s", title);
    snprintf(mm.artist, sizeof mm.artist, "%s", artist);
    snprintf(mm.album, sizeof mm.album, "%s", album);
    mm.pos_ms = (uint32_t)(pos < 0 ? 0 : pos);
    mm.dur_ms = (uint32_t)(dur < 0 ? 0 : dur);
    uint32_t st = 0;
    if (err != 0) st = 0;
    else if (state == NCM_PC_PLAYING) st = 1;
    else if (state == NCM_PC_PAUSED)  st = 2;
    else if (state == NCM_PC_BUFFER)  st = 3;
    else st = 0;
    mm.state = st;
    /* 封面：若已落盘（cover 缓存文件）则提供路径 */
    mm.flags = 0;
    const char *cp = cover_current_path();
    if (cp && cp[0]) {
        snprintf(mm.artwork, sizeof mm.artwork, "%s", cp);
        mm.flags |= MF_ART | MF_COVER;
    }
    if (lyric_count() > 0) mm.flags |= MF_LYRIC;
    send_frame(fd, MSG_META, req_id, &mm, sizeof mm);
}

static void apply_playctl(const m_playctl_t *c)
{
    switch (c->cmd) {
        case NCM_CTL_PLAY:  player_manager_pause(0); break;
        case NCM_CTL_PAUSE: player_manager_pause(1); break;
        case NCM_CTL_PREV:  player_manager_next(-1); break;
        case NCM_CTL_NEXT:  player_manager_next(1);  break;
        case NCM_CTL_SEEK:  player_manager_seek(c->seek_ms); break;
        case NCM_CTL_TOGGLE:
            /* 物理播放/暂停键（SDK 164 恒发 toggle，不再本地判 state）：源是状态权威，
             * 按当前态翻转（与播放页按钮 ui/player.c 同款判定）。非 PLAYING/PAUSED
             * （停止/缓冲）时 pause() 内部按态过滤，天然 no-op 安全。 */
            player_manager_pause(player_manager_state() == NCM_PC_PAUSED ? 0 : 1);
            break;
        default: break;
    }
}

static void *ipc_thread(void *arg)
{
    (void)arg;
    int fd = connect_path(sock_path());
    if (fd < 0) { meow_log(MEOW_LOG_WARN, "ipc: no launcher socket"); return NULL; }

    m_hello_t h;
    memset(&h, 0, sizeof h);
    ncm_strlcpy(h.app_id, "dev.player.ncm", sizeof h.app_id);
    h.version = 1;
    h.flags = MF_PLAYBACK;
    if (send_frame(fd, MSG_HELLO, 1, &h, sizeof h) != 0) { close(fd); return NULL; }
    uint8_t hb[256];
    uint16_t htype;
    if (read_frame(fd, &htype, hb, sizeof hb) < 0) { close(fd); return NULL; }

    send_meta(fd, 2);   /* 首条注册媒体源（state=0 未播也登记，start 播后自动成源） */

    uint64_t last_meta = 0;
    while (!g_quit && !g_app_quit) {
        struct pollfd p;
        p.fd = fd; p.events = POLLIN;
        int pr = poll(&p, 1, 200);
        if (pr > 0 && (p.revents & POLLIN)) {
            uint8_t rbuf[MEOW_IPC_MAX];
            uint16_t type;
            int n = read_frame(fd, &type, rbuf, sizeof rbuf);
            if (n < 0) break;
            if (type == MSG_PLAYCTL && n >= (int)sizeof(m_playctl_t)) {
                m_playctl_t c;
                memcpy(&c, rbuf, sizeof c);
                apply_playctl(&c);
            }
        } else if (pr < 0 && errno != EINTR) {
            break;
        }
        uint64_t now = meow_ui_time_ms();
        if (now - last_meta >= 1000) {
            send_meta(fd, (uint32_t)(now & 0x7FFFFFFF));
            last_meta = now;
        }
    }
    close(fd);
    return NULL;
}

int ipc_media_start(void)
{
    if (g_thr_on) return 0;
    g_quit = 0;
    if (ncm_thread_create(&g_thr, ipc_thread, NULL) != 0) return -1;
    pthread_detach(g_thr);
    g_thr_on = 1;
    return 0;
}

void ipc_media_stop(void)
{
    g_quit = 1;
    /* 线程在 200ms poll 内退出（detach，不 join）*/
    g_thr_on = 0;
}