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// SafeC Standard Library — Audio Buffer Implementation
#pragma once
#include <std/dsp/audio_buffer.h>
namespace std {
inline struct AudioBuffer AudioBuffer::new(unsigned long channels) {
struct AudioBuffer ab;
ab.cap_frames = (unsigned long)AUDIO_BUF_FRAMES;
ab.channels = channels;
ab.head = (unsigned long)0;
ab.tail = (unsigned long)0;
unsigned long total = (unsigned long)AUDIO_BUF_FRAMES * channels;
unsigned long i = (unsigned long)0;
while (i < total) {
unsafe { ab.data[i] = (Fixed)0; }
i = i + (unsigned long)1;
}
return ab;
}
inline unsigned long AudioBuffer::readable_frames() const {
return self.head - self.tail;
}
inline unsigned long AudioBuffer::writable_frames() const {
return self.cap_frames - (self.head - self.tail);
}
inline int AudioBuffer::is_empty() const {
if (self.head == self.tail) { return 1; }
return 0;
}
inline int AudioBuffer::is_full() const {
if ((self.head - self.tail) >= self.cap_frames) { return 1; }
return 0;
}
inline unsigned long AudioBuffer::write_frames([]const Fixed src) {
if (self.channels == 0UL) return 0UL;
unsigned long n = src.len / self.channels;
unsigned long space = self.writable_frames();
if (n > space) { n = space; }
unsigned long mask = self.cap_frames - (unsigned long)1;
unsigned long i = (unsigned long)0;
while (i < n) {
unsigned long slot = ((self.head + i) & mask) * self.channels;
unsigned long ch = (unsigned long)0;
while (ch < self.channels) {
Fixed v = src[i * self.channels + ch];
unsafe { self.data[slot + ch] = v; }
ch = ch + (unsigned long)1;
}
i = i + (unsigned long)1;
}
unsafe { asm volatile ("" : : : "memory"); }
self.head = self.head + n;
return n;
}
inline unsigned long AudioBuffer::read_frames([]Fixed dst) {
if (self.channels == 0UL) return 0UL;
unsigned long n = dst.len / self.channels;
unsigned long avail = self.readable_frames();
if (n > avail) { n = avail; }
unsigned long mask = self.cap_frames - (unsigned long)1;
unsigned long i = (unsigned long)0;
while (i < n) {
unsigned long slot = ((self.tail + i) & mask) * self.channels;
unsigned long ch = (unsigned long)0;
while (ch < self.channels) {
Fixed v;
unsafe { v = self.data[slot + ch]; }
dst[i * self.channels + ch] = v;
ch = ch + (unsigned long)1;
}
i = i + (unsigned long)1;
}
unsafe { asm volatile ("" : : : "memory"); }
self.tail = self.tail + n;
return n;
}
inline unsigned long AudioBuffer::peek_frames([]Fixed dst) const {
if (self.channels == 0UL) return 0UL;
unsigned long n = dst.len / self.channels;
unsigned long avail = self.readable_frames();
if (n > avail) { n = avail; }
unsigned long mask = self.cap_frames - (unsigned long)1;
unsigned long i = (unsigned long)0;
while (i < n) {
unsigned long slot = ((self.tail + i) & mask) * self.channels;
unsigned long ch = (unsigned long)0;
while (ch < self.channels) {
Fixed v;
unsafe { v = self.data[slot + ch]; }
dst[i * self.channels + ch] = v;
ch = ch + (unsigned long)1;
}
i = i + (unsigned long)1;
}
return n;
}
inline unsigned long AudioBuffer::mix_frames([]const Fixed src) {
if (self.channels == 0UL) return 0UL;
unsigned long n = src.len / self.channels;
unsigned long space = self.writable_frames();
if (n > space) { n = space; }
unsigned long mask = self.cap_frames - (unsigned long)1;
unsigned long i = (unsigned long)0;
while (i < n) {
unsigned long slot = ((self.head + i) & mask) * self.channels;
unsigned long ch = (unsigned long)0;
while (ch < self.channels) {
Fixed v = src[i * self.channels + ch];
unsafe { self.data[slot + ch] = fixed_add(self.data[slot + ch], v); }
ch = ch + (unsigned long)1;
}
i = i + (unsigned long)1;
}
return n;
}
inline void AudioBuffer::clear() {
self.head = (unsigned long)0;
self.tail = (unsigned long)0;
unsigned long total = self.cap_frames * self.channels;
unsigned long i = (unsigned long)0;
while (i < total) {
unsafe { self.data[i] = (Fixed)0; }
i = i + (unsigned long)1;
}
}
} // namespace std