mpd/src/output/MultipleOutputs.cxx

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/*
* Copyright (C) 2003-2014 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 "MultipleOutputs.hxx"
#include "PlayerControl.hxx"
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#include "Internal.hxx"
#include "Domain.hxx"
#include "MusicBuffer.hxx"
#include "MusicPipe.hxx"
#include "MusicChunk.hxx"
#include "system/FatalError.hxx"
#include "util/Error.hxx"
#include "config/ConfigData.hxx"
#include "config/ConfigGlobal.hxx"
#include "config/ConfigOption.hxx"
#include "notify.hxx"
#include <assert.h>
#include <string.h>
MultipleOutputs::MultipleOutputs()
:buffer(nullptr), pipe(nullptr),
elapsed_time(-1)
{
}
MultipleOutputs::~MultipleOutputs()
{
for (auto i : outputs) {
i->LockDisableWait();
i->Finish();
}
}
static AudioOutput *
LoadOutput(EventLoop &event_loop, PlayerControl &pc, const config_param &param)
{
Error error;
AudioOutput *output = audio_output_new(event_loop, param, pc, error);
if (output == nullptr) {
if (param.line > 0)
FormatFatalError("line %i: %s",
param.line,
error.GetMessage());
else
FatalError(error);
}
return output;
}
void
MultipleOutputs::Configure(EventLoop &event_loop, PlayerControl &pc)
{
const config_param *param = nullptr;
while ((param = config_get_next_param(CONF_AUDIO_OUTPUT,
param)) != nullptr) {
auto output = LoadOutput(event_loop, pc, *param);
if (FindByName(output->name) != nullptr)
FormatFatalError("output devices with identical "
"names: %s", output->name);
outputs.push_back(output);
}
if (outputs.empty()) {
/* auto-detect device */
const config_param empty;
auto output = LoadOutput(event_loop, pc, empty);
outputs.push_back(output);
}
}
AudioOutput *
MultipleOutputs::FindByName(const char *name) const
{
for (auto i : outputs)
if (strcmp(i->name, name) == 0)
return i;
return nullptr;
}
void
MultipleOutputs::EnableDisable()
{
for (auto ao : outputs) {
bool enabled;
ao->mutex.lock();
enabled = ao->really_enabled;
ao->mutex.unlock();
if (ao->enabled != enabled) {
if (ao->enabled)
ao->LockEnableWait();
else
ao->LockDisableWait();
}
}
}
bool
MultipleOutputs::AllFinished() const
{
for (auto ao : outputs) {
const ScopeLock protect(ao->mutex);
if (ao->IsOpen() && !ao->IsCommandFinished())
return false;
}
return true;
}
void
MultipleOutputs::WaitAll()
{
while (!AllFinished())
audio_output_client_notify.Wait();
}
void
MultipleOutputs::AllowPlay()
{
for (auto ao : outputs)
ao->LockAllowPlay();
}
static void
audio_output_reset_reopen(AudioOutput *ao)
{
const ScopeLock protect(ao->mutex);
ao->fail_timer.Reset();
}
void
MultipleOutputs::ResetReopen()
{
for (auto ao : outputs)
audio_output_reset_reopen(ao);
}
bool
MultipleOutputs::Update()
{
bool ret = false;
if (!input_audio_format.IsDefined())
return false;
for (auto ao : outputs)
ret = ao->LockUpdate(input_audio_format, *pipe)
|| ret;
return ret;
}
void
MultipleOutputs::SetReplayGainMode(ReplayGainMode mode)
{
for (auto ao : outputs)
ao->SetReplayGainMode(mode);
}
bool
MultipleOutputs::Play(music_chunk *chunk, Error &error)
{
assert(buffer != nullptr);
assert(pipe != nullptr);
assert(chunk != nullptr);
assert(chunk->CheckFormat(input_audio_format));
if (!Update()) {
/* TODO: obtain real error */
error.Set(output_domain, "Failed to open audio output");
return false;
}
pipe->Push(chunk);
for (auto ao : outputs)
ao->LockPlay();
return true;
}
bool
MultipleOutputs::Open(const AudioFormat audio_format,
MusicBuffer &_buffer,
Error &error)
{
bool ret = false, enabled = false;
assert(buffer == nullptr || buffer == &_buffer);
assert((pipe == nullptr) == (buffer == nullptr));
buffer = &_buffer;
/* the audio format must be the same as existing chunks in the
pipe */
assert(pipe == nullptr || pipe->CheckFormat(audio_format));
if (pipe == nullptr)
pipe = new MusicPipe();
else
/* if the pipe hasn't been cleared, the the audio
format must not have changed */
assert(pipe->IsEmpty() || audio_format == input_audio_format);
input_audio_format = audio_format;
ResetReopen();
EnableDisable();
Update();
for (auto ao : outputs) {
if (ao->enabled)
enabled = true;
if (ao->open)
ret = true;
}
if (!enabled)
error.Set(output_domain, "All audio outputs are disabled");
else if (!ret)
/* TODO: obtain real error */
error.Set(output_domain, "Failed to open audio output");
if (!ret)
/* close all devices if there was an error */
Close();
return ret;
}
/**
* Has the specified audio output already consumed this chunk?
*/
gcc_pure
static bool
chunk_is_consumed_in(const AudioOutput *ao,
gcc_unused const MusicPipe *pipe,
const struct music_chunk *chunk)
{
if (!ao->open)
return true;
if (ao->current_chunk == nullptr)
return false;
assert(chunk == ao->current_chunk ||
pipe->Contains(ao->current_chunk));
if (chunk != ao->current_chunk) {
assert(chunk->next != nullptr);
return true;
}
return ao->current_chunk_finished && chunk->next == nullptr;
}
bool
MultipleOutputs::IsChunkConsumed(const music_chunk *chunk) const
{
for (auto ao : outputs) {
const ScopeLock protect(ao->mutex);
if (!chunk_is_consumed_in(ao, pipe, chunk))
return false;
}
return true;
}
inline void
MultipleOutputs::ClearTailChunk(gcc_unused const struct music_chunk *chunk,
bool *locked)
{
assert(chunk->next == nullptr);
assert(pipe->Contains(chunk));
for (unsigned i = 0, n = outputs.size(); i != n; ++i) {
AudioOutput *ao = outputs[i];
/* this mutex will be unlocked by the caller when it's
ready */
ao->mutex.lock();
locked[i] = ao->open;
if (!locked[i]) {
ao->mutex.unlock();
continue;
}
assert(ao->current_chunk == chunk);
assert(ao->current_chunk_finished);
ao->current_chunk = nullptr;
}
}
unsigned
MultipleOutputs::Check()
{
const struct music_chunk *chunk;
bool is_tail;
struct music_chunk *shifted;
bool locked[outputs.size()];
assert(buffer != nullptr);
assert(pipe != nullptr);
while ((chunk = pipe->Peek()) != nullptr) {
assert(!pipe->IsEmpty());
if (!IsChunkConsumed(chunk))
/* at least one output is not finished playing
this chunk */
return pipe->GetSize();
if (chunk->length > 0 && chunk->times >= 0.0)
/* only update elapsed_time if the chunk
provides a defined value */
elapsed_time = chunk->times;
is_tail = chunk->next == nullptr;
if (is_tail)
/* this is the tail of the pipe - clear the
chunk reference in all outputs */
ClearTailChunk(chunk, locked);
/* remove the chunk from the pipe */
shifted = pipe->Shift();
assert(shifted == chunk);
if (is_tail)
/* unlock all audio outputs which were locked
by clear_tail_chunk() */
for (unsigned i = 0, n = outputs.size(); i != n; ++i)
if (locked[i])
outputs[i]->mutex.unlock();
/* return the chunk to the buffer */
buffer->Return(shifted);
}
return 0;
}
bool
MultipleOutputs::Wait(PlayerControl &pc, unsigned threshold)
{
pc.Lock();
if (Check() < threshold) {
pc.Unlock();
return true;
}
pc.Wait();
pc.Unlock();
return Check() < threshold;
}
void
MultipleOutputs::Pause()
{
Update();
for (auto ao : outputs)
ao->LockPauseAsync();
WaitAll();
}
void
MultipleOutputs::Drain()
{
for (auto ao : outputs)
ao->LockDrainAsync();
WaitAll();
}
void
MultipleOutputs::Cancel()
{
/* send the cancel() command to all audio outputs */
for (auto ao : outputs)
ao->LockCancelAsync();
WaitAll();
/* clear the music pipe and return all chunks to the buffer */
if (pipe != nullptr)
pipe->Clear(*buffer);
/* the audio outputs are now waiting for a signal, to
synchronize the cleared music pipe */
AllowPlay();
/* invalidate elapsed_time */
elapsed_time = -1.0;
}
void
MultipleOutputs::Close()
{
for (auto ao : outputs)
ao->LockCloseWait();
if (pipe != nullptr) {
assert(buffer != nullptr);
pipe->Clear(*buffer);
delete pipe;
pipe = nullptr;
}
buffer = nullptr;
input_audio_format.Clear();
elapsed_time = -1.0;
}
void
MultipleOutputs::Release()
{
for (auto ao : outputs)
ao->LockRelease();
if (pipe != nullptr) {
assert(buffer != nullptr);
pipe->Clear(*buffer);
delete pipe;
pipe = nullptr;
}
buffer = nullptr;
input_audio_format.Clear();
elapsed_time = -1.0;
}
void
MultipleOutputs::SongBorder()
{
/* clear the elapsed_time pointer at the beginning of a new
song */
elapsed_time = 0.0;
}