mpd/src/output/MultipleOutputs.cxx

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/*
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* Copyright 2003-2017 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 "Filtered.hxx"
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#include "Domain.hxx"
#include "MusicBuffer.hxx"
#include "MusicPipe.hxx"
#include "MusicChunk.hxx"
#include "config/Block.hxx"
#include "config/ConfigGlobal.hxx"
#include "config/ConfigOption.hxx"
#include "notify.hxx"
#include "util/RuntimeError.hxx"
#include <stdexcept>
#include <assert.h>
#include <string.h>
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MultipleOutputs::MultipleOutputs(MixerListener &_mixer_listener) noexcept
:mixer_listener(_mixer_listener)
{
}
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MultipleOutputs::~MultipleOutputs() noexcept
{
/* parallel destruction */
for (auto *i : outputs)
i->BeginDestroy();
for (auto *i : outputs)
delete i;
}
static std::unique_ptr<FilteredAudioOutput>
LoadOutput(EventLoop &event_loop,
const ReplayGainConfig &replay_gain_config,
MixerListener &mixer_listener,
const ConfigBlock &block)
try {
return audio_output_new(event_loop, replay_gain_config, block,
mixer_listener);
} catch (...) {
if (block.line > 0)
std::throw_with_nested(FormatRuntimeError("Failed to configure output in line %i",
block.line));
else
throw;
}
static AudioOutputControl *
LoadOutputControl(EventLoop &event_loop,
const ReplayGainConfig &replay_gain_config,
MixerListener &mixer_listener,
AudioOutputClient &client, const ConfigBlock &block)
{
auto output = LoadOutput(event_loop, replay_gain_config,
mixer_listener,
block);
auto *control = new AudioOutputControl(std::move(output), client);
try {
control->Configure(block);
} catch (...) {
control->BeginDestroy();
delete control;
throw;
}
return control;
}
void
MultipleOutputs::Configure(EventLoop &event_loop,
const ReplayGainConfig &replay_gain_config,
AudioOutputClient &client)
{
for (const auto *param = config_get_block(ConfigBlockOption::AUDIO_OUTPUT);
param != nullptr; param = param->next) {
auto *output = LoadOutputControl(event_loop,
replay_gain_config,
mixer_listener,
client, *param);
if (FindByName(output->GetName()) != nullptr)
throw FormatRuntimeError("output devices with identical "
"names: %s", output->GetName());
outputs.push_back(output);
}
if (outputs.empty()) {
/* auto-detect device */
const ConfigBlock empty;
auto *output = LoadOutputControl(event_loop,
replay_gain_config,
mixer_listener,
client, empty);
outputs.push_back(output);
}
}
void
MultipleOutputs::AddNullOutput(EventLoop &event_loop,
const ReplayGainConfig &replay_gain_config,
AudioOutputClient &client)
{
ConfigBlock block;
block.AddBlockParam("type", "null");
auto *output = LoadOutputControl(event_loop, replay_gain_config,
mixer_listener,
client, block);
outputs.push_back(output);
}
AudioOutputControl *
MultipleOutputs::FindByName(const char *name) noexcept
{
for (auto *i : outputs)
if (strcmp(i->GetName(), name) == 0)
return i;
return nullptr;
}
void
MultipleOutputs::EnableDisable()
{
/* parallel execution */
for (auto *ao : outputs) {
const std::lock_guard<Mutex> lock(ao->mutex);
ao->EnableDisableAsync();
}
for (auto *ao : outputs) {
const std::lock_guard<Mutex> lock(ao->mutex);
ao->WaitForCommand();
}
}
bool
MultipleOutputs::AllFinished() const noexcept
{
for (auto *ao : outputs) {
const std::lock_guard<Mutex> protect(ao->mutex);
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if (ao->IsBusy())
return false;
}
return true;
}
void
MultipleOutputs::WaitAll() noexcept
{
while (!AllFinished())
audio_output_client_notify.Wait();
}
void
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MultipleOutputs::AllowPlay() noexcept
{
for (auto *ao : outputs)
ao->LockAllowPlay();
}
bool
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MultipleOutputs::Update(bool force) noexcept
{
bool ret = false;
if (!input_audio_format.IsDefined())
return false;
for (auto *ao : outputs)
ret = ao->LockUpdate(input_audio_format, *pipe, force)
|| ret;
return ret;
}
void
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MultipleOutputs::SetReplayGainMode(ReplayGainMode mode) noexcept
{
for (auto *ao : outputs)
ao->SetReplayGainMode(mode);
}
void
MultipleOutputs::Play(MusicChunk *chunk)
{
assert(pipe != nullptr);
assert(chunk != nullptr);
assert(chunk->CheckFormat(input_audio_format));
if (!Update(false))
/* TODO: obtain real error */
throw std::runtime_error("Failed to open audio output");
pipe->Push(chunk);
for (auto *ao : outputs)
ao->LockPlay();
}
void
MultipleOutputs::Open(const AudioFormat audio_format,
MusicBuffer &buffer)
{
bool ret = false, enabled = false;
assert(pipe == nullptr || &pipe->GetBuffer() == &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(buffer);
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;
EnableDisable();
Update(true);
std::exception_ptr first_error;
for (auto *ao : outputs) {
const std::lock_guard<Mutex> lock(ao->mutex);
if (ao->IsEnabled())
enabled = true;
if (ao->IsOpen())
ret = true;
else if (!first_error)
first_error = ao->GetLastError();
}
if (!enabled) {
/* close all devices if there was an error */
Close();
throw std::runtime_error("All audio outputs are disabled");
} else if (!ret) {
/* close all devices if there was an error */
Close();
if (first_error)
/* we have details, so throw that */
std::rethrow_exception(first_error);
else
throw std::runtime_error("Failed to open audio output");
}
}
bool
MultipleOutputs::IsChunkConsumed(const MusicChunk *chunk) const noexcept
{
for (auto *ao : outputs)
if (!ao->LockIsChunkConsumed(*chunk))
return false;
return true;
}
inline void
MultipleOutputs::ClearTailChunk(const MusicChunk *chunk,
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bool *locked) noexcept
{
assert(chunk->next == nullptr);
assert(pipe->Contains(chunk));
for (unsigned i = 0, n = outputs.size(); i != n; ++i) {
auto *ao = outputs[i];
/* this mutex will be unlocked by the caller when it's
ready */
ao->mutex.lock();
locked[i] = ao->IsOpen();
if (!locked[i]) {
ao->mutex.unlock();
continue;
}
ao->ClearTailChunk(*chunk);
}
}
unsigned
MultipleOutputs::CheckPipe() noexcept
{
const MusicChunk *chunk;
bool is_tail;
MusicChunk *shifted;
bool locked[outputs.size()];
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->time.IsNegative())
/* only update elapsed_time if the chunk
provides a defined value */
elapsed_time = chunk->time;
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 */
pipe->GetBuffer().Return(shifted);
}
return 0;
}
void
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MultipleOutputs::Pause() noexcept
{
Update(false);
for (auto *ao : outputs)
ao->LockPauseAsync();
WaitAll();
}
void
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MultipleOutputs::Drain() noexcept
{
for (auto *ao : outputs)
ao->LockDrainAsync();
WaitAll();
}
void
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MultipleOutputs::Cancel() noexcept
{
/* 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();
/* the audio outputs are now waiting for a signal, to
synchronize the cleared music pipe */
AllowPlay();
/* invalidate elapsed_time */
elapsed_time = SignedSongTime::Negative();
}
void
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MultipleOutputs::Close() noexcept
{
for (auto *ao : outputs)
ao->LockCloseWait();
if (pipe != nullptr) {
pipe->Clear();
delete pipe;
pipe = nullptr;
}
input_audio_format.Clear();
elapsed_time = SignedSongTime::Negative();
}
void
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MultipleOutputs::Release() noexcept
{
for (auto *ao : outputs)
ao->LockRelease();
if (pipe != nullptr) {
pipe->Clear();
delete pipe;
pipe = nullptr;
}
input_audio_format.Clear();
elapsed_time = SignedSongTime::Negative();
}
void
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MultipleOutputs::SongBorder() noexcept
{
/* clear the elapsed_time pointer at the beginning of a new
song */
elapsed_time = SignedSongTime::zero();
}