| 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__ |
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