MPD  0.20.6
PcmExport.hxx
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2  * Copyright 2003-2017 The Music Player Daemon Project
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4  *
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19 
20 #ifndef PCM_EXPORT_HXX
21 #define PCM_EXPORT_HXX
22 
23 #include "check.h"
24 #include "SampleFormat.hxx"
25 #include "PcmBuffer.hxx"
26 
27 template<typename T> struct ConstBuffer;
28 struct AudioFormat;
29 
35 class PcmExport {
41  PcmBuffer order_buffer;
42 
43 #ifdef ENABLE_DSD
44 
50  PcmBuffer dop_buffer;
51 #endif
52 
58  PcmBuffer pack_buffer;
59 
65  PcmBuffer reverse_buffer;
66 
70  uint8_t channels;
71 
80  SampleFormat alsa_channel_order;
81 
82 #ifdef ENABLE_DSD
83 
86  bool dsd_u16;
87 
91  bool dsd_u32;
92 
98  bool dop;
99 #endif
100 
105  bool shift8;
106 
110  bool pack24;
111 
117  uint8_t reverse_endian;
118 
119 public:
120  struct Params {
121  bool alsa_channel_order = false;
122 #ifdef ENABLE_DSD
123  bool dsd_u16 = false;
124  bool dsd_u32 = false;
125  bool dop = false;
126 #endif
127  bool shift8 = false;
128  bool pack24 = false;
129  bool reverse_endian = false;
130 
137  gcc_pure
138  unsigned CalcOutputSampleRate(unsigned input_sample_rate) const;
139 
143  gcc_pure
144  unsigned CalcInputSampleRate(unsigned output_sample_rate) const;
145  };
146 
157  void Open(SampleFormat sample_format, unsigned channels,
158  Params params);
159 
163  void Reset() {
164  }
165 
169  gcc_pure
170  size_t GetFrameSize(const AudioFormat &audio_format) const;
171 
179 
185  gcc_pure
186  size_t CalcSourceSize(size_t dest_size) const;
187 };
188 
189 #endif
This structure describes the format of a raw PCM stream.
Definition: AudioFormat.hxx:37
void Reset()
Reset the filter's state, e.g.
Definition: PcmExport.hxx:163
gcc_pure unsigned CalcInputSampleRate(unsigned output_sample_rate) const
The inverse of CalcOutputSampleRate().
gcc_pure size_t CalcSourceSize(size_t dest_size) const
Converts the number of consumed bytes from the pcm_export() destination buffer to the according numbe...
ConstBuffer< void > Export(ConstBuffer< void > src)
Export a PCM buffer.
An object that handles export of PCM samples to some instance outside of MPD.
Definition: PcmExport.hxx:35
Manager for a temporary buffer which grows as needed.
Definition: PcmBuffer.hxx:33
SampleFormat
A reference to a memory area that is read-only.
Definition: FlacPcm.hxx:29
gcc_pure unsigned CalcOutputSampleRate(unsigned input_sample_rate) const
Calculate the output sample rate, given a specific input sample rate.
void Open(SampleFormat sample_format, unsigned channels, Params params)
Open the object.
#define gcc_pure
Definition: Compiler.h:116
gcc_pure size_t GetFrameSize(const AudioFormat &audio_format) const
Calculate the size of one output frame.