4493a96425
Renamed functions and variables.
577 lines
13 KiB
C
577 lines
13 KiB
C
/* the Music Player Daemon (MPD)
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* Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
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* This project's homepage is: http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "player_thread.h"
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#include "player_control.h"
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#include "decoder_control.h"
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#include "decoder_thread.h"
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#include "output_all.h"
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#include "pcm_volume.h"
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#include "path.h"
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#include "event_pipe.h"
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#include "crossfade.h"
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#include "song.h"
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#include "pipe.h"
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#include "idle.h"
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#include "main.h"
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#include <glib.h>
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#undef G_LOG_DOMAIN
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#define G_LOG_DOMAIN "player_thread"
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enum xfade_state {
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XFADE_DISABLED = -1,
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XFADE_UNKNOWN = 0,
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XFADE_ENABLED = 1
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};
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struct player {
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/**
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* are we waiting for buffered_before_play?
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*/
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bool buffering;
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/**
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* true if the decoder is starting and did not provide data
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* yet
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*/
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bool decoder_starting;
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/**
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* is the player paused?
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*/
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bool paused;
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/**
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* is there a new song in pc.next_song?
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*/
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bool queued;
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/**
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* the song currently being played
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*/
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struct song *song;
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/**
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* is cross fading enabled?
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*/
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enum xfade_state xfade;
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/**
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* index of the first chunk of the next song, -1 if there is
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* no next song
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*/
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int next_song_chunk;
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};
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static void player_command_finished(void)
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{
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assert(pc.command != PLAYER_COMMAND_NONE);
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pc.command = PLAYER_COMMAND_NONE;
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notify_signal(&main_notify);
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}
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static void player_stop_decoder(void)
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{
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dc_stop(&pc.notify);
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pc.state = PLAYER_STATE_STOP;
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event_pipe_emit(PIPE_EVENT_PLAYLIST);
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}
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static bool
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player_wait_for_decoder(struct player *player)
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{
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dc_command_wait(&pc.notify);
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if (decoder_has_failed()) {
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assert(dc.next_song == NULL || dc.next_song->url != NULL);
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pc.errored_song = dc.next_song;
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pc.error = PLAYER_ERROR_FILE;
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pc.next_song = NULL;
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return false;
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}
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pc.total_time = pc.next_song->tag != NULL
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? pc.next_song->tag->time : 0;
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pc.bit_rate = 0;
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audio_format_clear(&pc.audio_format);
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player->song = pc.next_song;
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pc.next_song = NULL;
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pc.elapsed_time = 0;
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player->queued = false;
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player->decoder_starting = true;
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/* call syncPlaylistWithQueue() in the main thread */
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event_pipe_emit(PIPE_EVENT_PLAYLIST);
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return true;
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}
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static bool player_seek_decoder(struct player *player)
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{
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double where;
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bool ret;
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if (decoder_current_song() != pc.next_song) {
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dc_stop(&pc.notify);
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player->next_song_chunk = -1;
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music_pipe_clear();
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dc_start_async(pc.next_song);
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ret = player_wait_for_decoder(player);
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if (!ret)
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return false;
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} else {
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pc.next_song = NULL;
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player->queued = false;
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}
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where = pc.seek_where;
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if (where > pc.total_time)
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where = pc.total_time - 0.1;
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if (where < 0.0)
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where = 0.0;
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ret = dc_seek(&pc.notify, where);
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if (ret)
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pc.elapsed_time = where;
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player_command_finished();
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return ret;
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}
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static void player_process_command(struct player *player)
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{
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switch (pc.command) {
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case PLAYER_COMMAND_NONE:
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case PLAYER_COMMAND_PLAY:
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case PLAYER_COMMAND_STOP:
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case PLAYER_COMMAND_EXIT:
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case PLAYER_COMMAND_CLOSE_AUDIO:
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break;
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case PLAYER_COMMAND_QUEUE:
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assert(pc.next_song != NULL);
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assert(!player->queued);
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assert(player->next_song_chunk == -1);
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player->queued = true;
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player_command_finished();
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break;
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case PLAYER_COMMAND_PAUSE:
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player->paused = !player->paused;
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if (player->paused) {
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audio_output_all_pause();
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pc.state = PLAYER_STATE_PAUSE;
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} else {
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if (audio_output_all_open(NULL)) {
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pc.state = PLAYER_STATE_PLAY;
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} else {
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char *uri = song_get_uri(dc.next_song);
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g_warning("problems opening audio device "
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"while playing \"%s\"", uri);
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g_free(uri);
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assert(dc.next_song == NULL || dc.next_song->url != NULL);
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pc.errored_song = dc.next_song;
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pc.error = PLAYER_ERROR_AUDIO;
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player->paused = true;
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}
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}
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player_command_finished();
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break;
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case PLAYER_COMMAND_SEEK:
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audio_output_all_cancel();
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if (player_seek_decoder(player)) {
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player->xfade = XFADE_UNKNOWN;
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/* abort buffering when the user has requested
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a seek */
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player->buffering = false;
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}
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break;
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case PLAYER_COMMAND_CANCEL:
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if (pc.next_song == NULL) {
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/* the cancel request arrived too later, we're
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already playing the queued song... stop
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everything now */
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pc.command = PLAYER_COMMAND_STOP;
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return;
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}
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if (player->next_song_chunk != -1) {
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/* the decoder is already decoding the song -
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stop it and reset the position */
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dc_stop(&pc.notify);
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music_pipe_chop(player->next_song_chunk);
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player->next_song_chunk = -1;
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}
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pc.next_song = NULL;
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player->queued = false;
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player_command_finished();
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break;
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}
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}
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static bool
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play_chunk(struct song *song, struct music_chunk *chunk,
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const struct audio_format *format, double sizeToTime)
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{
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pc.elapsed_time = chunk->times;
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pc.bit_rate = chunk->bit_rate;
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if (chunk->tag != NULL) {
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audio_output_all_tag(chunk->tag);
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if (!song_is_file(song)) {
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/* always update the tag of remote streams */
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struct tag *old_tag = song->tag;
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song->tag = tag_dup(chunk->tag);
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if (old_tag != NULL)
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tag_free(old_tag);
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/* the main thread will update the playlist
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version when he receives this event */
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event_pipe_emit(PIPE_EVENT_TAG);
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/* notify all clients that the tag of the
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current song has changed */
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idle_add(IDLE_PLAYER);
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}
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}
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if (chunk->length == 0)
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return true;
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pcm_volume(chunk->data, chunk->length,
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format, pc.software_volume);
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if (!audio_output_all_play(chunk->data, chunk->length)) {
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pc.errored_song = dc.current_song;
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pc.error = PLAYER_ERROR_AUDIO;
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return false;
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}
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pc.total_play_time += sizeToTime * chunk->length;
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return true;
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}
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static void do_play(void)
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{
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struct player player = {
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.buffering = true,
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.decoder_starting = false,
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.paused = false,
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.queued = false,
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.song = NULL,
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.xfade = XFADE_UNKNOWN,
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.next_song_chunk = -1,
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};
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unsigned int crossFadeChunks = 0;
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/** the position of the next cross-faded chunk in the next
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song */
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int nextChunk = 0;
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static const char silence[CHUNK_SIZE];
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struct audio_format play_audio_format;
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double sizeToTime = 0.0;
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music_pipe_clear();
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music_pipe_set_lazy(false);
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dc_start(&pc.notify, pc.next_song);
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if (!player_wait_for_decoder(&player)) {
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player_stop_decoder();
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player_command_finished();
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return;
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}
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pc.elapsed_time = 0;
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pc.state = PLAYER_STATE_PLAY;
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player_command_finished();
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while (true) {
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player_process_command(&player);
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if (pc.command == PLAYER_COMMAND_STOP ||
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pc.command == PLAYER_COMMAND_EXIT ||
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pc.command == PLAYER_COMMAND_CLOSE_AUDIO) {
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audio_output_all_cancel();
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break;
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}
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if (player.buffering) {
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if (music_pipe_available() < pc.buffered_before_play &&
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!decoder_is_idle()) {
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/* not enough decoded buffer space yet */
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notify_wait(&pc.notify);
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continue;
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} else {
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/* buffering is complete */
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player.buffering = false;
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music_pipe_set_lazy(true);
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}
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}
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if (player.decoder_starting) {
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if (decoder_has_failed()) {
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/* the decoder failed */
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assert(dc.next_song == NULL || dc.next_song->url != NULL);
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pc.errored_song = dc.next_song;
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pc.error = PLAYER_ERROR_FILE;
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break;
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}
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else if (!decoder_is_starting()) {
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/* the decoder is ready and ok */
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player.decoder_starting = false;
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if (!audio_output_all_open(&dc.out_audio_format)) {
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char *uri = song_get_uri(dc.next_song);
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g_warning("problems opening audio device "
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"while playing \"%s\"", uri);
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g_free(uri);
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assert(dc.next_song == NULL || dc.next_song->url != NULL);
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pc.errored_song = dc.next_song;
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pc.error = PLAYER_ERROR_AUDIO;
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break;
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}
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if (player.paused)
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audio_output_all_close();
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pc.total_time = dc.total_time;
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pc.audio_format = dc.in_audio_format;
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play_audio_format = dc.out_audio_format;
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sizeToTime = audioFormatSizeToTime(&dc.out_audio_format);
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}
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else {
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/* the decoder is not yet ready; wait
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some more */
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notify_wait(&pc.notify);
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continue;
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}
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}
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#ifndef NDEBUG
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/*
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music_pipe_check_format(&play_audio_format,
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player.next_song_chunk,
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&dc.out_audio_format);
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*/
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#endif
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if (decoder_is_idle() && player.queued) {
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/* the decoder has finished the current song;
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make it decode the next song */
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assert(pc.next_song != NULL);
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assert(player.next_song_chunk == -1);
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player.queued = false;
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player.next_song_chunk = music_pipe_tail_index();
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dc_start_async(pc.next_song);
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}
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if (player.next_song_chunk >= 0 &&
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player.xfade == XFADE_UNKNOWN &&
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!decoder_is_starting()) {
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/* enable cross fading in this song? if yes,
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calculate how many chunks will be required
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for it */
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crossFadeChunks =
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cross_fade_calc(pc.cross_fade_seconds, dc.total_time,
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&dc.out_audio_format,
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&play_audio_format,
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music_pipe_size() -
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pc.buffered_before_play);
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if (crossFadeChunks > 0) {
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player.xfade = XFADE_ENABLED;
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nextChunk = -1;
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} else
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/* cross fading is disabled or the
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next song is too short */
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player.xfade = XFADE_DISABLED;
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}
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if (player.paused)
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notify_wait(&pc.notify);
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else if (!music_pipe_is_empty() &&
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!music_pipe_head_is(player.next_song_chunk)) {
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struct music_chunk *beginChunk = music_pipe_peek();
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unsigned int fadePosition;
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if (player.xfade == XFADE_ENABLED &&
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player.next_song_chunk >= 0 &&
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(fadePosition = music_pipe_relative(player.next_song_chunk))
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<= crossFadeChunks) {
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/* perform cross fade */
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if (nextChunk < 0) {
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/* beginning of the cross fade
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- adjust crossFadeChunks
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which might be bigger than
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the remaining number of
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chunks in the old song */
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crossFadeChunks = fadePosition;
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}
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nextChunk = music_pipe_absolute(crossFadeChunks);
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if (nextChunk >= 0) {
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music_pipe_set_lazy(true);
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cross_fade_apply(beginChunk,
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music_pipe_get_chunk(nextChunk),
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&dc.out_audio_format,
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fadePosition,
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crossFadeChunks);
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} else {
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/* there are not enough
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decoded chunks yet */
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if (decoder_is_idle()) {
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/* the decoder isn't
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running, abort
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cross fading */
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player.xfade = XFADE_DISABLED;
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} else {
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/* wait for the
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decoder */
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music_pipe_set_lazy(false);
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notify_signal(&dc.notify);
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notify_wait(&pc.notify);
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/* set nextChunk to a
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non-negative value
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so the next
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iteration doesn't
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assume crossfading
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hasn't begun yet */
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nextChunk = 0;
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continue;
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}
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}
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}
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/* play the current chunk */
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if (!play_chunk(player.song, beginChunk,
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&play_audio_format, sizeToTime))
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break;
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music_pipe_shift();
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/* this formula should prevent that the
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decoder gets woken up with each chunk; it
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is more efficient to make it decode a
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larger block at a time */
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if (music_pipe_available() <= (pc.buffered_before_play + music_pipe_size() * 3) / 4)
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notify_signal(&dc.notify);
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} else if (music_pipe_head_is(player.next_song_chunk)) {
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/* at the beginning of a new song */
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if (player.xfade == XFADE_ENABLED && nextChunk >= 0) {
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/* the cross-fade is finished; skip
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the section which was cross-faded
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(and thus already played) */
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music_pipe_skip(crossFadeChunks);
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}
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player.xfade = XFADE_UNKNOWN;
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player.next_song_chunk = -1;
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if (!player_wait_for_decoder(&player))
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break;
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} else if (decoder_is_idle()) {
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break;
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} else {
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size_t frame_size =
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audio_format_frame_size(&play_audio_format);
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/* this formula ensures that we don't send
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partial frames */
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unsigned num_frames = CHUNK_SIZE / frame_size;
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/*DEBUG("waiting for decoded audio, play silence\n");*/
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if (!audio_output_all_play(silence, num_frames * frame_size))
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break;
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}
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}
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if (player.queued) {
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assert(pc.next_song != NULL);
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pc.next_song = NULL;
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}
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player_stop_decoder();
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}
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static gpointer player_task(G_GNUC_UNUSED gpointer arg)
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{
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decoder_thread_start();
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while (1) {
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switch (pc.command) {
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case PLAYER_COMMAND_PLAY:
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case PLAYER_COMMAND_QUEUE:
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assert(pc.next_song != NULL);
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do_play();
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break;
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case PLAYER_COMMAND_STOP:
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case PLAYER_COMMAND_SEEK:
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case PLAYER_COMMAND_PAUSE:
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pc.next_song = NULL;
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player_command_finished();
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break;
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case PLAYER_COMMAND_CLOSE_AUDIO:
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audio_output_all_close();
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player_command_finished();
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break;
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case PLAYER_COMMAND_EXIT:
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dc_quit();
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audio_output_all_close();
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player_command_finished();
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g_thread_exit(NULL);
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break;
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case PLAYER_COMMAND_CANCEL:
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pc.next_song = NULL;
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player_command_finished();
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break;
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case PLAYER_COMMAND_NONE:
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notify_wait(&pc.notify);
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break;
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}
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}
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return NULL;
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}
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void player_create(void)
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{
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GError *e = NULL;
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|
|
assert(pc.thread == NULL);
|
|
|
|
pc.thread = g_thread_create(player_task, NULL, true, &e);
|
|
if (pc.thread == NULL)
|
|
g_error("Failed to spawn player task: %s", e->message);
|
|
}
|