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#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/soundcard.h>
//OSSv4 features: define fallbacks for OSSv3 (where these ioctls are ignored)
#ifndef SNDCTL_DSP_COOKEDMODE
#define SNDCTL_DSP_COOKEDMODE _IOW('P', 30, int)
#endif
#ifndef SNDCTL_DSP_POLICY
#define SNDCTL_DSP_POLICY _IOW('P', 45, int)
#endif
struct AudioOSS : AudioDriver {
AudioOSS& self = *this;
AudioOSS(Audio& super) : AudioDriver(super) {}
~AudioOSS() { terminate(); }
auto create() -> bool override {
super.setDevice("/dev/dsp");
super.setChannels(2);
super.setFrequency(48000);
super.setLatency(3);
return initialize();
}
auto driver() -> string override { return "OSS"; }
auto ready() -> bool override { return _fd >= 0; }
auto hasBlocking() -> bool override { return true; }
auto hasDynamic() -> bool override { return true; }
auto hasDevices() -> std::vector<string> override {
std::vector<string> devices;
devices.push_back("/dev/dsp");
for(auto& device : directory::files("/dev/", "dsp?*")) devices.push_back(string{"/dev/", device});
return devices;
}
auto hasChannels() -> std::vector<u32> override {
return {1, 2, 3, 4, 5, 6, 7, 8};
}
auto hasFrequencies() -> std::vector<u32> override {
return {22050, 44100, 48000, 96000, 192000};
}
auto hasLatencies() -> std::vector<u32> override {
return {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
}
auto setDevice(string device) -> bool override { return initialize(); }
auto setBlocking(bool blocking) -> bool override { return updateBlocking(); }
auto setChannels(u32 channels) -> bool override { return initialize(); }
auto setFrequency(u32 frequency) -> bool override { return initialize(); }
auto setLatency(u32 latency) -> bool override { return initialize(); }
auto clear() -> void override {
if(_buffer) {
memory::fill(_buffer, _bufferSize);
_offset = 0;
}
}
auto level() -> double override {
audio_buf_info info;
ioctl(_fd, SNDCTL_DSP_GETOSPACE, &info);
return (double)(_nonBlockBytes - info.bytes) / _nonBlockBytes;
}
auto output(const double samples[]) -> void override {
if(!_buffer) return;
for(u32 n : range(self.channels)) {
switch(_format) {
case AFMT_S8: *(s8*)(&_buffer[_offset]) = sclamp<8>(samples[n] * 127.0); break;
case AFMT_S16_LE: *(s16*)(&_buffer[_offset]) = sclamp<16>(samples[n] * 32767.0); break;
#if defined(AFMT_S24_LE)
case AFMT_S24_LE: *(s32*)(&_buffer[_offset]) = sclamp<24>(samples[n] * 8388607.0); break;
#endif
#if defined(AFMT_S32_LE)
case AFMT_S32_LE: *(s32*)(&_buffer[_offset]) = sclamp<32>(samples[n] * 2147483647.0); break;
#endif
default: return;
}
_offset += _formatSize;
if(_offset >= _bufferSize) {
write(_fd, _buffer, _bufferSize);
_offset = 0;
}
}
}
private:
auto initialize() -> bool {
terminate();
auto devices = hasDevices();
if(std::ranges::find(devices, self.device) == devices.end()) {
if(!devices.empty()) self.device = devices.front();
}
_fd = open(self.device, O_WRONLY | O_NONBLOCK);
if(_fd < 0) return false;
int cooked = 1;
ioctl(_fd, SNDCTL_DSP_COOKEDMODE, &cooked);
//policy: 0 = minimum latency (higher CPU usage); 10 = maximum latency (lower CPU usage)
int policy = min(10, self.latency);
ioctl(_fd, SNDCTL_DSP_POLICY, &policy);
if(!updateChannels()) return terminate(), false;
if(!updateFormat()) return terminate(), false;
if(!updateFrequency()) return terminate(), false;
if(!updateBlocking()) return terminate(), false;
if(!updateNonBlockBytes()) return terminate(), false;
_bufferSize = _frames * self.channels * _formatSize;
_buffer = memory::allocate(_bufferSize);
if(!_buffer) return terminate(), false;
_offset = 0;
return true;
}
auto terminate() -> void {
if(!ready()) return;
if(_buffer) {
memory::free(_buffer);
_buffer = nullptr;
_bufferSize = 0;
_offset = 0;
}
close(_fd);
_fd = -1;
}
auto updateChannels() -> bool {
int channels = self.channels;
if(ioctl(_fd, SNDCTL_DSP_CHANNELS, &channels) == -1) return false;
if(!super.hasChannels(channels)) return false;
super.updateResampleChannels(channels);
self.channels = channels;
return true;
}
auto updateFormat() -> bool {
if(ioctl(_fd, SNDCTL_DSP_SETFMT, &_format) == -1) return false;
switch(_format) {
case AFMT_S8: _formatSize = sizeof(s8); break;
case AFMT_S16_LE: _formatSize = sizeof(s16); break;
#if defined(AFMT_S24_LE)
case AFMT_S24_LE: _formatSize = sizeof(s32); break; // OSS uses 32 bits for 24bit
#endif
#if defined(AFMT_S32_LE)
case AFMT_S32_LE: _formatSize = sizeof(s32); break;
#endif
default: return false;
}
return true;
}
auto updateFrequency() -> bool {
int frequency = self.frequency;
if(ioctl(_fd, SNDCTL_DSP_SPEED, &frequency) == -1) return false;
if(!super.hasFrequency(frequency)) return false;
super.updateResampleFrequency(frequency);
self.frequency = frequency;
return true;
}
auto updateBlocking() -> bool {
if(!ready()) return false;
auto flags = fcntl(_fd, F_GETFL);
if(flags < 0) return false;
self.blocking ? flags &=~ O_NONBLOCK : flags |= O_NONBLOCK;
fcntl(_fd, F_SETFL, flags);
return true;
}
auto updateNonBlockBytes() -> bool {
audio_buf_info info;
if(ioctl(_fd, SNDCTL_DSP_GETOSPACE, &info) == -1) return false;
if(info.bytes < 1) return false;
_nonBlockBytes = info.bytes;
return true;
}
s32 _fd = -1;
s32 _format = AFMT_S16_LE;
u32 _formatSize = 0;
static constexpr u32 _frames = 32;
s32 _nonBlockBytes = 1;
u8* _buffer = nullptr;
u32 _bufferSize = 0;
u32 _offset = 0;
};
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