mpd/src/player_thread.c

638 lines
14 KiB
C

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