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🎥 Command line media player
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C
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#include <pthread.h>#include <errno.h>#include <unistd.h>
#include <poll.h>#include <signal.h>#include <sys/types.h>#include <sys/socket.h>#include <sys/stat.h>#include <sys/un.h>
#include "config.h"
#include "osdep/io.h"#include "osdep/threads.h"
#include "common/common.h"#include "common/global.h"#include "common/msg.h"#include "input/input.h"#include "libmpv/client.h"#include "options/m_config.h"#include "options/options.h"#include "options/path.h"#include "player/client.h"
#ifndef MSG_NOSIGNAL#define MSG_NOSIGNAL 0#endif
struct mp_ipc_ctx { struct mp_log *log; struct mp_client_api *client_api; const char *path;
pthread_t thread; int death_pipe[2];};
struct client_arg { struct mp_log *log; struct mpv_handle *client;
char *client_name; int client_fd; bool close_client_fd;
bool writable;};
static int ipc_write_str(struct client_arg *client, const char *buf){ size_t count = strlen(buf); while (count > 0) { ssize_t rc = send(client->client_fd, buf, count, MSG_NOSIGNAL); if (rc <= 0) { if (rc == 0) return -1;
if (errno == EBADF || errno == ENOTSOCK) { client->writable = false; return 0; }
if (errno == EINTR || errno == EAGAIN) continue;
return rc; }
count -= rc; buf += rc; }
return 0;}
static void *client_thread(void *p){ pthread_detach(pthread_self());
// We don't use MSG_NOSIGNAL because the moldy fruit OS doesn't support it. struct sigaction sa = { .sa_handler = SIG_IGN, .sa_flags = SA_RESTART }; sigfillset(&sa.sa_mask); sigaction(SIGPIPE, &sa, NULL);
int rc;
struct client_arg *arg = p; bstr client_msg = { talloc_strdup(NULL, ""), 0 };
mpthread_set_name(arg->client_name);
int pipe_fd = mpv_get_wakeup_pipe(arg->client); if (pipe_fd < 0) { MP_ERR(arg, "Could not get wakeup pipe\n"); goto done; }
MP_VERBOSE(arg, "Client connected\n");
struct pollfd fds[2] = { {.events = POLLIN, .fd = pipe_fd}, {.events = POLLIN, .fd = arg->client_fd}, };
fcntl(arg->client_fd, F_SETFL, fcntl(arg->client_fd, F_GETFL, 0) | O_NONBLOCK);
while (1) { rc = poll(fds, 2, 0); if (rc == 0) rc = poll(fds, 2, -1); if (rc < 0) { MP_ERR(arg, "Poll error\n"); continue; }
if (fds[0].revents & POLLIN) { mp_flush_wakeup_pipe(pipe_fd);
while (1) { mpv_event *event = mpv_wait_event(arg->client, 0);
if (event->event_id == MPV_EVENT_NONE) break;
if (event->event_id == MPV_EVENT_SHUTDOWN) goto done;
if (!arg->writable) continue;
char *event_msg = mp_json_encode_event(event); if (!event_msg) { MP_ERR(arg, "Encoding error\n"); goto done; }
rc = ipc_write_str(arg, event_msg); talloc_free(event_msg); if (rc < 0) { MP_ERR(arg, "Write error (%s)\n", mp_strerror(errno)); goto done; } } }
if (fds[1].revents & (POLLIN | POLLHUP)) { while (1) { char buf[128]; bstr append = { buf, 0 };
ssize_t bytes = read(arg->client_fd, buf, sizeof(buf)); if (bytes < 0) { if (errno == EAGAIN) break;
MP_ERR(arg, "Read error (%s)\n", mp_strerror(errno)); goto done; }
if (bytes == 0) { MP_VERBOSE(arg, "Client disconnected\n"); goto done; }
append.len = bytes;
bstr_xappend(NULL, &client_msg, append);
while (bstrchr(client_msg, '\n') != -1) { char *reply_msg = mp_ipc_consume_next_command(arg->client, NULL, &client_msg);
if (reply_msg && arg->writable) { rc = ipc_write_str(arg, reply_msg); if (rc < 0) { MP_ERR(arg, "Write error (%s)\n", mp_strerror(errno)); talloc_free(reply_msg); goto done; } }
talloc_free(reply_msg); } } } }
done: if (client_msg.len > 0) MP_WARN(arg, "Ignoring unterminated command on disconnect.\n"); talloc_free(client_msg.start); if (arg->close_client_fd) close(arg->client_fd); mpv_destroy(arg->client); talloc_free(arg); return NULL;}
static void ipc_start_client(struct mp_ipc_ctx *ctx, struct client_arg *client){ client->client = mp_new_client(ctx->client_api, client->client_name); if (!client->client) goto err;
client->log = mp_client_get_log(client->client);
pthread_t client_thr; if (pthread_create(&client_thr, NULL, client_thread, client)) goto err;
return;
err: if (client->client) mpv_destroy(client->client);
if (client->close_client_fd) close(client->client_fd);
talloc_free(client);}
static void ipc_start_client_json(struct mp_ipc_ctx *ctx, int id, int fd){ struct client_arg *client = talloc_ptrtype(NULL, client); *client = (struct client_arg){ .client_name = talloc_asprintf(client, "ipc-%d", id), .client_fd = fd, .close_client_fd = true,
.writable = true, };
ipc_start_client(ctx, client);}
static void ipc_start_client_text(struct mp_ipc_ctx *ctx, const char *path){ int mode = O_RDONLY; int client_fd = -1; bool close_client_fd = true; bool writable = false;
if (strcmp(path, "/dev/stdin") == 0) { // for symmetry with Linux client_fd = STDIN_FILENO; close_client_fd = false; } else if (strncmp(path, "fd://", 5) == 0) { char *end = NULL; client_fd = strtol(path + 5, &end, 0); if (!end || end == path + 5 || end[0]) { MP_ERR(ctx, "Invalid FD: %s\n", path); return; } close_client_fd = false; writable = true; // maybe } else { // Use RDWR for FIFOs to ensure they stay open over multiple accesses. struct stat st; if (stat(path, &st) == 0 && S_ISFIFO(st.st_mode)) mode = O_RDWR; client_fd = open(path, mode); } if (client_fd < 0) { MP_ERR(ctx, "Could not open '%s'\n", path); return; }
struct client_arg *client = talloc_ptrtype(NULL, client); *client = (struct client_arg){ .client_name = "input-file", .client_fd = client_fd, .close_client_fd = close_client_fd, .writable = writable, };
ipc_start_client(ctx, client);}
static void *ipc_thread(void *p){ int rc;
int ipc_fd; struct sockaddr_un ipc_un = {0};
struct mp_ipc_ctx *arg = p;
mpthread_set_name("ipc socket listener");
MP_VERBOSE(arg, "Starting IPC master\n");
ipc_fd = socket(AF_UNIX, SOCK_STREAM, 0); if (ipc_fd < 0) { MP_ERR(arg, "Could not create IPC socket\n"); goto done; }
#if HAVE_FCHMOD fchmod(ipc_fd, 0600);#endif
size_t path_len = strlen(arg->path); if (path_len >= sizeof(ipc_un.sun_path) - 1) { MP_ERR(arg, "Could not create IPC socket\n"); goto done; }
ipc_un.sun_family = AF_UNIX, strncpy(ipc_un.sun_path, arg->path, sizeof(ipc_un.sun_path) - 1);
unlink(ipc_un.sun_path);
if (ipc_un.sun_path[0] == '@') { ipc_un.sun_path[0] = '\0'; path_len--; }
size_t addr_len = offsetof(struct sockaddr_un, sun_path) + 1 + path_len; rc = bind(ipc_fd, (struct sockaddr *) &ipc_un, addr_len); if (rc < 0) { MP_ERR(arg, "Could not bind IPC socket\n"); goto done; }
rc = listen(ipc_fd, 10); if (rc < 0) { MP_ERR(arg, "Could not listen on IPC socket\n"); goto done; }
MP_VERBOSE(arg, "Listening to IPC socket.\n");
int client_num = 0;
struct pollfd fds[2] = { {.events = POLLIN, .fd = arg->death_pipe[0]}, {.events = POLLIN, .fd = ipc_fd}, };
while (1) { rc = poll(fds, 2, -1); if (rc < 0) { MP_ERR(arg, "Poll error\n"); continue; }
if (fds[0].revents & POLLIN) goto done;
if (fds[1].revents & POLLIN) { int client_fd = accept(ipc_fd, NULL, NULL); if (client_fd < 0) { MP_ERR(arg, "Could not accept IPC client\n"); goto done; }
ipc_start_client_json(arg, client_num++, client_fd); } }
done: if (ipc_fd >= 0) close(ipc_fd);
return NULL;}
struct mp_ipc_ctx *mp_init_ipc(struct mp_client_api *client_api, struct mpv_global *global){ struct MPOpts *opts = mp_get_config_group(NULL, global, &mp_opt_root);
struct mp_ipc_ctx *arg = talloc_ptrtype(NULL, arg); *arg = (struct mp_ipc_ctx){ .log = mp_log_new(arg, global->log, "ipc"), .client_api = client_api, .path = mp_get_user_path(arg, global, opts->ipc_path), .death_pipe = {-1, -1}, }; char *input_file = mp_get_user_path(arg, global, opts->input_file);
talloc_free(opts);
if (input_file && *input_file) ipc_start_client_text(arg, input_file);
if (!arg->path || !arg->path[0]) goto out;
if (mp_make_wakeup_pipe(arg->death_pipe) < 0) goto out;
if (pthread_create(&arg->thread, NULL, ipc_thread, arg)) goto out;
return arg;
out: if (arg->death_pipe[0] >= 0) { close(arg->death_pipe[0]); close(arg->death_pipe[1]); } talloc_free(arg); return NULL;}
void mp_uninit_ipc(struct mp_ipc_ctx *arg){ if (!arg) return;
(void)write(arg->death_pipe[1], &(char){0}, 1); pthread_join(arg->thread, NULL);
close(arg->death_pipe[0]); close(arg->death_pipe[1]); talloc_free(arg);}