MPD 0.20.6

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Source.hxx
Go to the documentation of this file.
1 /*
2 * Copyright 2003-2017 The Music Player Daemon Project
3 * http://www.musicpd.org
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19
20 #ifndef AUDIO_OUTPUT_SOURCE_HXX
21 #define AUDIO_OUTPUT_SOURCE_HXX
22
23 #include "check.h"
24 #include "Compiler.h"
25 #include "SharedPipeConsumer.hxx"
26 #include "AudioFormat.hxx"
27 #include "ReplayGainMode.hxx"
28 #include "pcm/PcmBuffer.hxx"
29 #include "pcm/PcmDither.hxx"
30 #include "util/ConstBuffer.hxx"
31
32 #include <utility>
33
34 #include <assert.h>
35 #include <stdint.h>
36
37 struct MusicChunk;
38 struct Tag;
39 class Mutex;
40 class Filter;
41 class PreparedFilter;
42
49 class AudioOutputSource {
54 AudioFormat in_audio_format = AudioFormat::Undefined();
55
56 ReplayGainMode replay_gain_mode = ReplayGainMode::OFF;
57
61 SharedPipeConsumer pipe;
62
67 unsigned replay_gain_serial;
68
73 unsigned other_replay_gain_serial;
74
79 Filter *replay_gain_filter_instance = nullptr;
80
86 Filter *other_replay_gain_filter_instance = nullptr;
87
91 PcmBuffer cross_fade_buffer;
92
96 PcmDither cross_fade_dither;
97
102 Filter *filter_instance = nullptr;
103
108 const MusicChunk *current_chunk = nullptr;
109
113 const Tag *pending_tag;
114
119 ConstBuffer<uint8_t> pending_data;
120
121 public:
122 void SetReplayGainMode(ReplayGainMode _mode) {
123 replay_gain_mode = _mode;
124 }
125
126 bool IsOpen() const {
127 return in_audio_format.IsDefined();
128 }
129
130 const AudioFormat &GetInputAudioFormat() const {
131 assert(IsOpen());
132
133 return in_audio_format;
134 }
135
136 AudioFormat Open(AudioFormat audio_format, const MusicPipe &_pipe,
137 PreparedFilter *prepared_replay_gain_filter,
138 PreparedFilter *prepared_other_replay_gain_filter,
139 PreparedFilter *prepared_filter);
140
141 void Close();
142 void Cancel();
143
155 bool Fill(Mutex &mutex);
156
161 const Tag *ReadTag() noexcept {
162 assert(current_chunk != nullptr);
163
164 return std::exchange(pending_tag, nullptr);
165 }
166
175 ConstBuffer<void> PeekData() const noexcept {
176 return pending_data.ToVoid();
177 }
178
182 void ConsumeData(size_t nbytes) noexcept;
183
184 bool IsChunkConsumed(const MusicChunk &chunk) const {
185 assert(IsOpen());
186
187 return pipe.IsConsumed(chunk);
188 }
189
190 void ClearTailChunk(const MusicChunk &chunk) {
191 pipe.ClearTail(chunk);
192 }
193
194 private:
195 void OpenFilter(AudioFormat audio_format,
196 PreparedFilter *prepared_replay_gain_filter,
197 PreparedFilter *prepared_other_replay_gain_filter,
198 PreparedFilter *prepared_filter);
199
200 void CloseFilter();
201
202 ConstBuffer<void> GetChunkData(const MusicChunk &chunk,
203 Filter *replay_gain_filter,
204 unsigned *replay_gain_serial_p);
205
206 ConstBuffer<void> FilterChunk(const MusicChunk &chunk);
207 };
208
209 #endif
check.h
ReplayGainMode
ReplayGainMode
Definition: ReplayGainMode.hxx:27
AudioFormat
This structure describes the format of a raw PCM stream.
Definition: AudioFormat.hxx:37
ConstBuffer< void >
Definition: ConstBuffer.hxx:45
ReplayGainMode.hxx
SharedPipeConsumer
A utility class which helps with consuming data from a MusicPipe.
Definition: SharedPipeConsumer.hxx:39
AudioOutputSource::Cancel
void Cancel()
AudioOutputSource::IsChunkConsumed
bool IsChunkConsumed(const MusicChunk &chunk) const
Definition: Source.hxx:184
MusicPipe
A queue of MusicChunk objects.
Definition: MusicPipe.hxx:39
Tag
The meta information about a song file.
Definition: Tag.hxx:34
AudioFormat.hxx
Mutex
Definition: Mutex.hxx:43
SharedPipeConsumer.hxx
Filter
Definition: FilterInternal.hxx:36
PcmBuffer.hxx
AudioFormat::Undefined
static constexpr AudioFormat Undefined()
Definition: AudioFormat.hxx:75
MusicChunk
A chunk of music data.
Definition: MusicChunk.hxx:43
AudioOutputSource
Source of audio data to be played by an AudioOutput.
Definition: Source.hxx:49
AudioOutputSource::ReadTag
const Tag * ReadTag() noexcept
Reads the Tag to be processed.
Definition: Source.hxx:161
Compiler.h
AudioOutputSource::GetInputAudioFormat
const AudioFormat & GetInputAudioFormat() const
Definition: Source.hxx:130
SharedPipeConsumer::ClearTail
void ClearTail(gcc_unused const MusicChunk &_chunk)
Definition: SharedPipeConsumer.hxx:90
PcmBuffer
Manager for a temporary buffer which grows as needed.
Definition: PcmBuffer.hxx:33
AudioOutputSource::Open
AudioFormat Open(AudioFormat audio_format, const MusicPipe &_pipe, PreparedFilter *prepared_replay_gain_filter, PreparedFilter *prepared_other_replay_gain_filter, PreparedFilter *prepared_filter)
ConstBuffer< uint8_t >
ReplayGainMode::OFF
AudioOutputSource::Close
void Close()
AudioOutputSource::ConsumeData
void ConsumeData(size_t nbytes) noexcept
Mark portions of the PeekData() return value as "consumed".
PreparedFilter
Definition: FilterInternal.hxx:74
AudioOutputSource::SetReplayGainMode
void SetReplayGainMode(ReplayGainMode _mode)
Definition: Source.hxx:122
ConstBuffer::ToVoid
constexpr ConstBuffer< void > ToVoid() const
Definition: ConstBuffer.hxx:128
AudioOutputSource::IsOpen
bool IsOpen() const
Definition: Source.hxx:126
AudioOutputSource::Fill
bool Fill(Mutex &mutex)
Ensure that ReadTag() or PeekData() return any input.
ConstBuffer.hxx
AudioOutputSource::ClearTailChunk
void ClearTailChunk(const MusicChunk &chunk)
Definition: Source.hxx:190
SharedPipeConsumer::IsConsumed
gcc_pure bool IsConsumed(const MusicChunk &_chunk) const
PcmDither
Definition: PcmDither.hxx:27
PcmDither.hxx
AudioFormat::IsDefined
constexpr bool IsDefined() const
Checks whether the object has a defined value.
Definition: AudioFormat.hxx:92
AudioOutputSource::PeekData
ConstBuffer< void > PeekData() const noexcept
Returns the remaining filtered PCM data be played.
Definition: Source.hxx:175