int mod_process_activate(fd_set *rfds) { char buf [10]; if (FD_ISSET(sigp[0], rfds)) { buf[0] = 'D'; read(sigp[0], buf, 1); switch (buf[0]) { case 'D': log_error("process", "sigp (%i) is dead. wtf? assuming glitch and trying to go on", sigp[0]); sleep (6); break;; case 'C': update(); break;; case 'T': log_info("process", "init got a sigterm. tearing down the whole thing."); dc_quit(); break;; default: log_debug("process", "sigp says '%c'. *shrug* ", buf[0]); } } return 0; }
/* * The main loop of the player thread, during playback. This is * basically a state machine, which multiplexes data between the * decoder thread and the output threads. */ static void do_play(struct player_control *pc, struct decoder_control *dc) { struct player player = { .pc = pc, .dc = dc, .buffering = true, .decoder_starting = false, .paused = false, .queued = true, .song = NULL, .xfade = XFADE_UNKNOWN, .cross_fading = false, .cross_fade_chunks = 0, .cross_fade_tag = NULL, .elapsed_time = 0.0, }; player_unlock(pc); player.pipe = music_pipe_new(); player_dc_start(&player, player.pipe); if (!player_wait_for_decoder(&player)) { player_dc_stop(&player); player_command_finished(pc); music_pipe_free(player.pipe); event_pipe_emit(PIPE_EVENT_PLAYLIST); player_lock(pc); return; } player_lock(pc); pc->state = PLAYER_STATE_PLAY; player_command_finished_locked(pc); while (true) { player_process_command(&player); if (pc->command == PLAYER_COMMAND_STOP || pc->command == PLAYER_COMMAND_EXIT || pc->command == PLAYER_COMMAND_CLOSE_AUDIO) { player_unlock(pc); audio_output_all_cancel(); break; } player_unlock(pc); if (player.buffering) { /* buffering at the start of the song - wait until the buffer is large enough, to prevent stuttering on slow machines */ if (music_pipe_size(player.pipe) < pc->buffered_before_play && !decoder_lock_is_idle(dc)) { /* not enough decoded buffer space yet */ if (!player.paused && audio_format_defined(&player.play_audio_format) && audio_output_all_check() < 4 && !player_send_silence(&player)) break; decoder_lock(dc); /* XXX race condition: check decoder again */ player_wait_decoder(pc, dc); decoder_unlock(dc); player_lock(pc); continue; } else { /* buffering is complete */ player.buffering = false; } } if (player.decoder_starting) { /* wait until the decoder is initialized completely */ if (!player_check_decoder_startup(&player)) break; player_lock(pc); continue; } #ifndef NDEBUG /* music_pipe_check_format(&play_audio_format, player.next_song_chunk, &dc->out_audio_format); */ #endif if (decoder_lock_is_idle(dc) && player.queued && dc->pipe == player.pipe) { /* the decoder has finished the current song; make it decode the next song */ assert(dc->pipe == NULL || dc->pipe == player.pipe); player_dc_start(&player, music_pipe_new()); } if (player_dc_at_next_song(&player) && player.xfade == XFADE_UNKNOWN && !decoder_lock_is_starting(dc)) { /* enable cross fading in this song? if yes, calculate how many chunks will be required for it */ player.cross_fade_chunks = cross_fade_calc(pc->cross_fade_seconds, dc->total_time, pc->mixramp_db, pc->mixramp_delay_seconds, dc->replay_gain_db, dc->replay_gain_prev_db, dc->mixramp_start, dc->mixramp_prev_end, &dc->out_audio_format, &player.play_audio_format, music_buffer_size(player_buffer) - pc->buffered_before_play); if (player.cross_fade_chunks > 0) { player.xfade = XFADE_ENABLED; player.cross_fading = false; } else /* cross fading is disabled or the next song is too short */ player.xfade = XFADE_DISABLED; } if (player.paused) { player_lock(pc); if (pc->command == PLAYER_COMMAND_NONE) player_wait(pc); continue; } else if (!music_pipe_empty(player.pipe)) { /* at least one music chunk is ready - send it to the audio output */ play_next_chunk(&player); } else if (audio_output_all_check() > 0) { /* not enough data from decoder, but the output thread is still busy, so it's okay */ /* XXX synchronize in a better way */ g_usleep(10000); } else if (player_dc_at_next_song(&player)) { /* at the beginning of a new song */ if (!player_song_border(&player)) break; } else if (decoder_lock_is_idle(dc)) { /* check the size of the pipe again, because the decoder thread may have added something since we last checked */ if (music_pipe_empty(player.pipe)) { /* wait for the hardware to finish playback */ audio_output_all_drain(); break; } } else { /* the decoder is too busy and hasn't provided new PCM data in time: send silence (if the output pipe is empty) */ if (!player_send_silence(&player)) break; } player_lock(pc); } player_dc_stop(&player); music_pipe_clear(player.pipe, player_buffer); music_pipe_free(player.pipe); if (player.cross_fade_tag != NULL) tag_free(player.cross_fade_tag); player_lock(pc); if (player.queued) { assert(pc->next_song != NULL); pc->next_song = NULL; } pc->state = PLAYER_STATE_STOP; player_unlock(pc); event_pipe_emit(PIPE_EVENT_PLAYLIST); player_lock(pc); } static gpointer player_task(gpointer arg) { struct player_control *pc = arg; struct decoder_control *dc = dc_new(pc->cond); decoder_thread_start(dc); player_buffer = music_buffer_new(pc->buffer_chunks); player_lock(pc); while (1) { switch (pc->command) { case PLAYER_COMMAND_QUEUE: assert(pc->next_song != NULL); do_play(pc, dc); break; case PLAYER_COMMAND_STOP: player_unlock(pc); audio_output_all_cancel(); player_lock(pc); /* fall through */ case PLAYER_COMMAND_SEEK: case PLAYER_COMMAND_PAUSE: pc->next_song = NULL; player_command_finished_locked(pc); break; case PLAYER_COMMAND_CLOSE_AUDIO: player_unlock(pc); audio_output_all_release(); player_lock(pc); player_command_finished_locked(pc); #ifndef NDEBUG /* in the DEBUG build, check for leaked music_chunk objects by freeing the music_buffer */ music_buffer_free(player_buffer); player_buffer = music_buffer_new(pc->buffer_chunks); #endif break; case PLAYER_COMMAND_UPDATE_AUDIO: player_unlock(pc); audio_output_all_enable_disable(); player_lock(pc); player_command_finished_locked(pc); break; case PLAYER_COMMAND_EXIT: player_unlock(pc); dc_quit(dc); dc_free(dc); audio_output_all_close(); music_buffer_free(player_buffer); player_command_finished(pc); return NULL; case PLAYER_COMMAND_CANCEL: pc->next_song = NULL; player_command_finished_locked(pc); break; case PLAYER_COMMAND_REFRESH: /* no-op when not playing */ player_command_finished_locked(pc); break; case PLAYER_COMMAND_NONE: player_wait(pc); break; } } } void player_create(struct player_control *pc) { assert(pc->thread == NULL); GError *e = NULL; pc->thread = g_thread_create(player_task, pc, true, &e); if (pc->thread == NULL) MPD_ERROR("Failed to spawn player task: %s", e->message); }