mpd/src/output_all.c

602 lines
12 KiB
C

/*
* Copyright (C) 2003-2010 The Music Player Daemon Project
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "output_all.h"
#include "output_internal.h"
#include "output_control.h"
#include "chunk.h"
#include "conf.h"
#include "pipe.h"
#include "buffer.h"
#include "player_control.h"
#include "mpd_error.h"
#ifndef NDEBUG
#include "chunk.h"
#endif
#include <assert.h>
#include <string.h>
#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "output"
static struct audio_format input_audio_format;
static struct audio_output *audio_outputs;
static unsigned int num_audio_outputs;
/**
* The #music_buffer object where consumed chunks are returned.
*/
static struct music_buffer *g_music_buffer;
/**
* The #music_pipe object which feeds all audio outputs. It is filled
* by audio_output_all_play().
*/
static struct music_pipe *g_mp;
/**
* The "elapsed_time" stamp of the most recently finished chunk.
*/
static float audio_output_all_elapsed_time = -1.0;
unsigned int audio_output_count(void)
{
return num_audio_outputs;
}
struct audio_output *
audio_output_get(unsigned i)
{
assert(i < num_audio_outputs);
return &audio_outputs[i];
}
struct audio_output *
audio_output_find(const char *name)
{
for (unsigned i = 0; i < num_audio_outputs; ++i) {
struct audio_output *ao = audio_output_get(i);
if (strcmp(ao->name, name) == 0)
return ao;
}
/* name not found */
return NULL;
}
static unsigned
audio_output_config_count(void)
{
unsigned int nr = 0;
const struct config_param *param = NULL;
while ((param = config_get_next_param(CONF_AUDIO_OUTPUT, param)))
nr++;
if (!nr)
nr = 1; /* we'll always have at least one device */
return nr;
}
void
audio_output_all_init(void)
{
const struct config_param *param = NULL;
unsigned int i;
GError *error = NULL;
notify_init(&audio_output_client_notify);
num_audio_outputs = audio_output_config_count();
audio_outputs = g_new(struct audio_output, num_audio_outputs);
for (i = 0; i < num_audio_outputs; i++)
{
struct audio_output *output = &audio_outputs[i];
unsigned int j;
param = config_get_next_param(CONF_AUDIO_OUTPUT, param);
/* only allow param to be NULL if there just one audioOutput */
assert(param || (num_audio_outputs == 1));
if (!audio_output_init(output, param, &error)) {
if (param != NULL)
MPD_ERROR("line %i: %s",
param->line, error->message);
else
MPD_ERROR("%s", error->message);
}
/* require output names to be unique: */
for (j = 0; j < i; j++) {
if (!strcmp(output->name, audio_outputs[j].name)) {
MPD_ERROR("output devices with identical "
"names: %s\n", output->name);
}
}
}
}
void
audio_output_all_finish(void)
{
unsigned int i;
for (i = 0; i < num_audio_outputs; i++) {
audio_output_disable(&audio_outputs[i]);
audio_output_finish(&audio_outputs[i]);
}
g_free(audio_outputs);
audio_outputs = NULL;
num_audio_outputs = 0;
notify_deinit(&audio_output_client_notify);
}
void
audio_output_all_enable_disable(void)
{
for (unsigned i = 0; i < num_audio_outputs; i++) {
struct audio_output *ao = &audio_outputs[i];
bool enabled;
g_mutex_lock(ao->mutex);
enabled = ao->really_enabled;
g_mutex_unlock(ao->mutex);
if (ao->enabled != enabled) {
if (ao->enabled)
audio_output_enable(ao);
else
audio_output_disable(ao);
}
}
}
/**
* Determine if all (active) outputs have finished the current
* command.
*/
static bool
audio_output_all_finished(void)
{
for (unsigned i = 0; i < num_audio_outputs; ++i) {
struct audio_output *ao = &audio_outputs[i];
bool not_finished;
g_mutex_lock(ao->mutex);
not_finished = audio_output_is_open(ao) &&
!audio_output_command_is_finished(ao);
g_mutex_unlock(ao->mutex);
if (not_finished)
return false;
}
return true;
}
static void audio_output_wait_all(void)
{
while (!audio_output_all_finished())
notify_wait(&audio_output_client_notify);
}
/**
* Signal the audio output if it is open, and set the "allow_play"
* flag. This function locks the mutex.
*/
static void
audio_output_lock_signal(struct audio_output *ao)
{
g_mutex_lock(ao->mutex);
ao->allow_play = true;
if (audio_output_is_open(ao))
g_cond_signal(ao->cond);
g_mutex_unlock(ao->mutex);
}
/**
* Signals all audio outputs which are open.
*/
static void
audio_output_signal_all(void)
{
for (unsigned i = 0; i < num_audio_outputs; ++i)
audio_output_lock_signal(&audio_outputs[i]);
}
static void
audio_output_reset_reopen(struct audio_output *ao)
{
g_mutex_lock(ao->mutex);
if (!ao->open && ao->fail_timer != NULL) {
g_timer_destroy(ao->fail_timer);
ao->fail_timer = NULL;
}
g_mutex_unlock(ao->mutex);
}
/**
* Resets the "reopen" flag on all audio devices. MPD should
* immediately retry to open the device instead of waiting for the
* timeout when the user wants to start playback.
*/
static void
audio_output_all_reset_reopen(void)
{
for (unsigned i = 0; i < num_audio_outputs; ++i) {
struct audio_output *ao = &audio_outputs[i];
audio_output_reset_reopen(ao);
}
}
/**
* Opens all output devices which are enabled, but closed.
*
* @return true if there is at least open output device which is open
*/
static bool
audio_output_all_update(void)
{
unsigned int i;
bool ret = false;
if (!audio_format_defined(&input_audio_format))
return false;
for (i = 0; i < num_audio_outputs; ++i)
ret = audio_output_update(&audio_outputs[i],
&input_audio_format, g_mp) || ret;
return ret;
}
bool
audio_output_all_play(struct music_chunk *chunk)
{
bool ret;
unsigned int i;
assert(g_music_buffer != NULL);
assert(g_mp != NULL);
assert(chunk != NULL);
assert(music_chunk_check_format(chunk, &input_audio_format));
ret = audio_output_all_update();
if (!ret)
return false;
music_pipe_push(g_mp, chunk);
for (i = 0; i < num_audio_outputs; ++i)
audio_output_play(&audio_outputs[i]);
return true;
}
bool
audio_output_all_open(const struct audio_format *audio_format,
struct music_buffer *buffer)
{
bool ret = false, enabled = false;
unsigned int i;
assert(audio_format != NULL);
assert(buffer != NULL);
assert(g_music_buffer == NULL || g_music_buffer == buffer);
assert((g_mp == NULL) == (g_music_buffer == NULL));
g_music_buffer = buffer;
/* the audio format must be the same as existing chunks in the
pipe */
assert(g_mp == NULL || music_pipe_check_format(g_mp, audio_format));
if (g_mp == NULL)
g_mp = music_pipe_new();
else
/* if the pipe hasn't been cleared, the the audio
format must not have changed */
assert(music_pipe_empty(g_mp) ||
audio_format_equals(audio_format,
&input_audio_format));
input_audio_format = *audio_format;
audio_output_all_reset_reopen();
audio_output_all_enable_disable();
audio_output_all_update();
for (i = 0; i < num_audio_outputs; ++i) {
if (audio_outputs[i].enabled)
enabled = true;
if (audio_outputs[i].open)
ret = true;
}
if (!enabled)
g_warning("All audio outputs are disabled");
if (!ret)
/* close all devices if there was an error */
audio_output_all_close();
return ret;
}
/**
* Has the specified audio output already consumed this chunk?
*/
static bool
chunk_is_consumed_in(const struct audio_output *ao,
const struct music_chunk *chunk)
{
if (!ao->open)
return true;
if (ao->chunk == NULL)
return false;
assert(chunk == ao->chunk || music_pipe_contains(g_mp, ao->chunk));
if (chunk != ao->chunk) {
assert(chunk->next != NULL);
return true;
}
return ao->chunk_finished && chunk->next == NULL;
}
/**
* Has this chunk been consumed by all audio outputs?
*/
static bool
chunk_is_consumed(const struct music_chunk *chunk)
{
for (unsigned i = 0; i < num_audio_outputs; ++i) {
const struct audio_output *ao = &audio_outputs[i];
bool consumed;
g_mutex_lock(ao->mutex);
consumed = chunk_is_consumed_in(ao, chunk);
g_mutex_unlock(ao->mutex);
if (!consumed)
return false;
}
return true;
}
/**
* There's only one chunk left in the pipe (#g_mp), and all audio
* outputs have consumed it already. Clear the reference.
*/
static void
clear_tail_chunk(G_GNUC_UNUSED const struct music_chunk *chunk, bool *locked)
{
assert(chunk->next == NULL);
assert(music_pipe_contains(g_mp, chunk));
for (unsigned i = 0; i < num_audio_outputs; ++i) {
struct audio_output *ao = &audio_outputs[i];
/* this mutex will be unlocked by the caller when it's
ready */
g_mutex_lock(ao->mutex);
locked[i] = ao->open;
if (!locked[i]) {
g_mutex_unlock(ao->mutex);
continue;
}
assert(ao->chunk == chunk);
assert(ao->chunk_finished);
ao->chunk = NULL;
}
}
unsigned
audio_output_all_check(void)
{
const struct music_chunk *chunk;
bool is_tail;
struct music_chunk *shifted;
bool locked[num_audio_outputs];
assert(g_music_buffer != NULL);
assert(g_mp != NULL);
while ((chunk = music_pipe_peek(g_mp)) != NULL) {
assert(!music_pipe_empty(g_mp));
if (!chunk_is_consumed(chunk))
/* at least one output is not finished playing
this chunk */
return music_pipe_size(g_mp);
if (chunk->length > 0 && chunk->times >= 0.0)
/* only update elapsed_time if the chunk
provides a defined value */
audio_output_all_elapsed_time = chunk->times;
is_tail = chunk->next == NULL;
if (is_tail)
/* this is the tail of the pipe - clear the
chunk reference in all outputs */
clear_tail_chunk(chunk, locked);
/* remove the chunk from the pipe */
shifted = music_pipe_shift(g_mp);
assert(shifted == chunk);
if (is_tail)
/* unlock all audio outputs which were locked
by clear_tail_chunk() */
for (unsigned i = 0; i < num_audio_outputs; ++i)
if (locked[i])
g_mutex_unlock(audio_outputs[i].mutex);
/* return the chunk to the buffer */
music_buffer_return(g_music_buffer, shifted);
}
return 0;
}
bool
audio_output_all_wait(unsigned threshold)
{
player_lock();
if (audio_output_all_check() < threshold) {
player_unlock();
return true;
}
player_wait();
player_unlock();
return audio_output_all_check() < threshold;
}
void
audio_output_all_pause(void)
{
unsigned int i;
audio_output_all_update();
for (i = 0; i < num_audio_outputs; ++i)
audio_output_pause(&audio_outputs[i]);
audio_output_wait_all();
}
void
audio_output_all_drain(void)
{
for (unsigned i = 0; i < num_audio_outputs; ++i)
audio_output_drain_async(&audio_outputs[i]);
audio_output_wait_all();
}
void
audio_output_all_cancel(void)
{
unsigned int i;
/* send the cancel() command to all audio outputs */
for (i = 0; i < num_audio_outputs; ++i)
audio_output_cancel(&audio_outputs[i]);
audio_output_wait_all();
/* clear the music pipe and return all chunks to the buffer */
if (g_mp != NULL)
music_pipe_clear(g_mp, g_music_buffer);
/* the audio outputs are now waiting for a signal, to
synchronize the cleared music pipe */
audio_output_signal_all();
/* invalidate elapsed_time */
audio_output_all_elapsed_time = -1.0;
}
void
audio_output_all_close(void)
{
unsigned int i;
for (i = 0; i < num_audio_outputs; ++i)
audio_output_close(&audio_outputs[i]);
if (g_mp != NULL) {
assert(g_music_buffer != NULL);
music_pipe_clear(g_mp, g_music_buffer);
music_pipe_free(g_mp);
g_mp = NULL;
}
g_music_buffer = NULL;
audio_format_clear(&input_audio_format);
audio_output_all_elapsed_time = -1.0;
}
void
audio_output_all_release(void)
{
unsigned int i;
for (i = 0; i < num_audio_outputs; ++i)
audio_output_release(&audio_outputs[i]);
if (g_mp != NULL) {
assert(g_music_buffer != NULL);
music_pipe_clear(g_mp, g_music_buffer);
music_pipe_free(g_mp);
g_mp = NULL;
}
g_music_buffer = NULL;
audio_format_clear(&input_audio_format);
audio_output_all_elapsed_time = -1.0;
}
void
audio_output_all_song_border(void)
{
/* clear the elapsed_time pointer at the beginning of a new
song */
audio_output_all_elapsed_time = 0.0;
}
float
audio_output_all_get_elapsed_time(void)
{
return audio_output_all_elapsed_time;
}