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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.
*/
#ifndef AUDIO_OUTPUT_SOURCE_HXX
#define AUDIO_OUTPUT_SOURCE_HXX
#include "check.h"
#include "Compiler.h"
#include "SharedPipeConsumer.hxx"
#include "AudioFormat.hxx"
#include "ReplayGainMode.hxx"
#include "pcm/PcmBuffer.hxx"
#include "pcm/PcmDither.hxx"
#include "util/ConstBuffer.hxx"
#include <utility>
#include <memory>
#include <assert.h>
#include <stdint.h>
struct MusicChunk;
struct Tag;
class Mutex;
class Filter;
class PreparedFilter;
/**
* Source of audio data to be played by an #AudioOutput. It receives
* #MusicChunk instances from a #MusicPipe (via #SharedPipeConsumer).
* It applies configured filters, ReplayGain and returns plain PCM
* data.
*/
class AudioOutputSource {
/**
* The audio_format in which audio data is received from the
* player thread (which in turn receives it from the decoder).
*/
AudioFormat in_audio_format = AudioFormat::Undefined();
ReplayGainMode replay_gain_mode = ReplayGainMode::OFF;
/**
* A reference to the #MusicPipe and the current position.
*/
SharedPipeConsumer pipe;
/**
* The serial number of the last replay gain info. 0 means no
* replay gain info was available.
*/
unsigned replay_gain_serial;
/**
* The serial number of the last replay gain info by the
* "other" chunk during cross-fading.
*/
unsigned other_replay_gain_serial;
/**
* The replay_gain_filter_plugin instance of this audio
* output.
*/
std::unique_ptr<Filter> replay_gain_filter_instance;
/**
* The replay_gain_filter_plugin instance of this audio
* output, to be applied to the second chunk during
* cross-fading.
*/
std::unique_ptr<Filter> other_replay_gain_filter_instance;
/**
* The buffer used to allocate the cross-fading result.
*/
PcmBuffer cross_fade_buffer;
/**
* The dithering state for cross-fading two streams.
*/
PcmDither cross_fade_dither;
/**
* The filter object of this audio output. This is an
* instance of chain_filter_plugin.
*/
std::unique_ptr<Filter> filter_instance;
/**
* The #MusicChunk currently being processed (see
* #pending_tag, #pending_data).
*/
const MusicChunk *current_chunk = nullptr;
/**
* The #Tag to be processed by the #AudioOutput.
*/
const Tag *pending_tag;
/**
* Filtered #MusicChunk PCM data to be processed by the
* #AudioOutput.
*/
ConstBuffer<uint8_t> pending_data;
public:
AudioOutputSource() noexcept;
~AudioOutputSource() noexcept;
void SetReplayGainMode(ReplayGainMode _mode) noexcept {
replay_gain_mode = _mode;
}
bool IsOpen() const {
return in_audio_format.IsDefined();
}
const AudioFormat &GetInputAudioFormat() const {
assert(IsOpen());
return in_audio_format;
}
AudioFormat Open(AudioFormat audio_format, const MusicPipe &_pipe,
PreparedFilter *prepared_replay_gain_filter,
PreparedFilter *prepared_other_replay_gain_filter,
PreparedFilter &prepared_filter);
void Close() noexcept;
void Cancel() noexcept;
/**
* Ensure that ReadTag() or PeekData() return any input.
*
* Throws std::runtime_error on error
*
* @param mutex the #Mutex which protects the
* #SharedPipeConsumer; it is locked by the caller, and may be
* unlocked temporarily by this method
* @return true if any input is available, false if the source
* has (temporarily?) run empty
*/
bool Fill(Mutex &mutex);
/**
* Reads the #Tag to be processed. Be sure to call Fill()
* successfully before calling this metohd.
*/
const Tag *ReadTag() noexcept {
assert(current_chunk != nullptr);
return std::exchange(pending_tag, nullptr);
}
/**
* Returns the remaining filtered PCM data be played. The
* caller shall use ConsumeData() to mark portions of the
* return value as "consumed".
*
* Be sure to call Fill() successfully before calling this
* metohd.
*/
ConstBuffer<void> PeekData() const noexcept {
return pending_data.ToVoid();
}
/**
* Mark portions of the PeekData() return value as "consumed".
*/
void ConsumeData(size_t nbytes) noexcept;
bool IsChunkConsumed(const MusicChunk &chunk) const noexcept {
assert(IsOpen());
return pipe.IsConsumed(chunk);
}
void ClearTailChunk(const MusicChunk &chunk) noexcept {
pipe.ClearTail(chunk);
}
private:
void OpenFilter(AudioFormat audio_format,
PreparedFilter *prepared_replay_gain_filter,
PreparedFilter *prepared_other_replay_gain_filter,
PreparedFilter &prepared_filter);
void CloseFilter() noexcept;
ConstBuffer<void> GetChunkData(const MusicChunk &chunk,
Filter *replay_gain_filter,
unsigned *replay_gain_serial_p);
ConstBuffer<void> FilterChunk(const MusicChunk &chunk);
};
#endif
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