77 |
buffer_t RAMCache; ///< Buffers samples (already uncompressed) in RAM. |
buffer_t RAMCache; ///< Buffers samples (already uncompressed) in RAM. |
78 |
long SetPos(unsigned long FrameCount, int Whence); |
long SetPos(unsigned long FrameCount, int Whence); |
79 |
}; |
}; |
80 |
|
|
81 |
|
template <class R> |
82 |
|
class SampleFileBase : public SampleFile { |
83 |
|
public: |
84 |
|
SampleFileBase(String File, bool DontClose = false) : SampleFile(File, DontClose) { } |
85 |
|
virtual ~SampleFileBase() { } |
86 |
|
|
87 |
|
|
88 |
|
|
89 |
|
/** |
90 |
|
* Reads \a SampleCount number of sample points from the position stored |
91 |
|
* in \a pPlaybackState into the buffer pointed by \a pBuffer and moves |
92 |
|
* the position within the sample respectively, this method honors the |
93 |
|
* looping informations of the sample (if any). Use this |
94 |
|
* method if you don't want to load the sample into RAM, thus for disk |
95 |
|
* streaming. All this methods needs to know to proceed with streaming |
96 |
|
* for the next time you call this method is stored in \a pPlaybackState. |
97 |
|
* You have to allocate and initialize the playback_state_t structure by |
98 |
|
* yourself before you use it to stream a sample: |
99 |
|
* @code |
100 |
|
* PlaybackState playbackstate; |
101 |
|
* playbackstate.position = 0; |
102 |
|
* playbackstate.reverse = false; |
103 |
|
* playbackstate.loop_cycles_left = pSample->LoopPlayCount; |
104 |
|
* @endcode |
105 |
|
* You don't have to take care of things like if there is actually a loop |
106 |
|
* defined or if the current read position is located within a loop area. |
107 |
|
* The method already handles such cases by itself. |
108 |
|
* |
109 |
|
* @param pBuffer destination buffer |
110 |
|
* @param FrameCount number of sample points to read |
111 |
|
* @param pPlaybackState will be used to store and reload the playback |
112 |
|
* state for the next ReadAndLoop() call |
113 |
|
* @returns number of successfully read sample points |
114 |
|
*/ |
115 |
|
unsigned long ReadAndLoop ( |
116 |
|
void* pBuffer, |
117 |
|
unsigned long FrameCount, |
118 |
|
PlaybackState* pPlaybackState, |
119 |
|
R* pRegion |
120 |
|
) { |
121 |
|
// TODO: startAddrsCoarseOffset, endAddrsCoarseOffset |
122 |
|
unsigned long samplestoread = FrameCount, totalreadsamples = 0, readsamples, samplestoloopend; |
123 |
|
uint8_t* pDst = (uint8_t*) pBuffer; |
124 |
|
SetPos(pPlaybackState->position); |
125 |
|
if (pRegion->HasLoop()) { |
126 |
|
do { |
127 |
|
samplestoloopend = pRegion->GetLoopEnd() - GetPos(); |
128 |
|
readsamples = Read(&pDst[totalreadsamples * GetFrameSize()], Min(samplestoread, samplestoloopend)); |
129 |
|
samplestoread -= readsamples; |
130 |
|
totalreadsamples += readsamples; |
131 |
|
if (readsamples == samplestoloopend) { |
132 |
|
SetPos(pRegion->GetLoopStart()); |
133 |
|
} |
134 |
|
} while (samplestoread && readsamples); |
135 |
|
} else { |
136 |
|
totalreadsamples = Read(pBuffer, FrameCount); |
137 |
|
} |
138 |
|
|
139 |
|
pPlaybackState->position = GetPos(); |
140 |
|
|
141 |
|
return totalreadsamples; |
142 |
|
} |
143 |
|
|
144 |
|
protected: |
145 |
|
inline long Min(long A, long B) { return (A > B) ? B : A; } |
146 |
|
}; |
147 |
} // namespace LinuxSampler |
} // namespace LinuxSampler |
148 |
|
|
149 |
#endif // __LS_SAMPLEFILE_H__ |
#endif // __LS_SAMPLEFILE_H__ |