/[svn]/linuxsampler/tags/v0_1_0/src/modulationsystem.cpp
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revision 31 by schoenebeck, Sun Jan 18 20:31:31 2004 UTC revision 32 by schoenebeck, Tue Feb 3 13:21:19 2004 UTC
# Line 25  Line 25 
25  float** ModulationSystem::pDestinationParameter = NULL;  float** ModulationSystem::pDestinationParameter = NULL;
26  uint    ModulationSystem::uiSampleRate;  uint    ModulationSystem::uiSampleRate;
27  uint    ModulationSystem::uiMaxSamplesPerCycle;  uint    ModulationSystem::uiMaxSamplesPerCycle;
28    ModulationSystem::__FragmentTime__ ModulationSystem::FragmentTime;
29    
30  void ModulationSystem::Initialize(uint SampleRate, uint MaxSamplesPerCycle) {  void ModulationSystem::Initialize(uint SampleRate, uint MaxSamplesPerCycle) {
31      ModulationSystem::uiMaxSamplesPerCycle = MaxSamplesPerCycle;      ModulationSystem::uiMaxSamplesPerCycle = MaxSamplesPerCycle;
# Line 36  void ModulationSystem::Initialize(uint S Line 37  void ModulationSystem::Initialize(uint S
37              pDestinationParameter[i] = pDestinationParameter[i - 1] + MaxSamplesPerCycle;              pDestinationParameter[i] = pDestinationParameter[i - 1] + MaxSamplesPerCycle;
38          }          }
39      }      }
40        ModulationSystem::FragmentTime.end = ModulationSystem::CreateTimeStamp();
41  }  }
42    
43  void ModulationSystem::Close() {  void ModulationSystem::Close() {
# Line 52  void ModulationSystem::Close() { Line 54  void ModulationSystem::Close() {
54  void ModulationSystem::ResetDestinationParameter(ModulationSystem::destination_t dst, float val) {  void ModulationSystem::ResetDestinationParameter(ModulationSystem::destination_t dst, float val) {
55      for (int i = 0; i < uiMaxSamplesPerCycle; i++) pDestinationParameter[dst][i] = val;      for (int i = 0; i < uiMaxSamplesPerCycle; i++) pDestinationParameter[dst][i] = val;
56  }  }
57    
58    /**
59     * Updates the time stamps for the beginning and end of the current audio
60     * fragment. This is needed to be able to calculate the respective sample
61     * point later for which an event belongs to.
62     */
63    void ModulationSystem::UpdateFragmentTime() {
64        // update time stamp for this audio fragment cycle
65        ModulationSystem::FragmentTime.begin = ModulationSystem::FragmentTime.end;
66        ModulationSystem::FragmentTime.end   = ModulationSystem::CreateTimeStamp();
67    
68        // recalculate sample ratio for this audio fragment
69        real_time_t fragmentDuration = ModulationSystem::FragmentTime.end - ModulationSystem::FragmentTime.begin;
70        ModulationSystem::FragmentTime.sample_ratio = (float) ModulationSystem::uiMaxSamplesPerCycle / (float) fragmentDuration;
71    }
72    
73    /**
74     * Creates a real time stamp for the current moment. Out of efficiency this
75     * is implemented in inline assembly for each CPU independently; we currently
76     * don't use a generic solution for CPUs that are not yet covered by the
77     * assembly code, instead an error message is prompted on compile time, forcing
78     * the user to contact us.
79     */
80    ModulationSystem::real_time_t ModulationSystem::CreateTimeStamp() {
81        #if defined(__i386__) || defined(__x86_64__)
82            uint64_t t;
83            __asm__ __volatile__ ("rdtsc" : "=A" (t));
84            return t >> 8;
85        #elif defined(__ia64__)
86            real_time_t t;
87            __asm__ __volatile__ ("mov %0=ar.itc" : "=r"(t));
88            return t;
89        #elif defined(__powerpc__)
90            real_time_t t;
91            __asm__ __volatile__ (
92                "98:        mftb %0\n"
93                "99:\n"
94                ".section __ftr_fixup,\"a\"\n"
95                "   .long %1\n"
96                "   .long 0\n"
97                "   .long 98b\n"
98                "   .long 99b\n"
99                ".previous"
100                : "=r" (t) : "i" (0x00000100)
101            );
102            return t;
103        #elif defined(__alpha__)
104            real_time_t t;
105            __asm__ __volatile__ ("rpcc %0" : "=r"(t));
106            return t;
107        #else // we don't want to use a slow generic solution
108        #  error Sorry, LinuxSampler lacks time stamp code for your system.
109        #  error Please report this error and the CPU you are using to the LinuxSampler developers mailing list!
110        #endif
111    }
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