mirror of https://github.com/bsnes-emu/bsnes.git
129 lines
3.5 KiB
C++
129 lines
3.5 KiB
C++
#include <unistd.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/soundcard.h>
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//OSSv4 features: define fallbacks for OSSv3 (where these ioctls are ignored)
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#ifndef SNDCTL_DSP_COOKEDMODE
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#define SNDCTL_DSP_COOKEDMODE _IOW('P', 30, int)
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#endif
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#ifndef SNDCTL_DSP_POLICY
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#define SNDCTL_DSP_POLICY _IOW('P', 45, int)
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#endif
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struct AudioOSS : AudioDriver {
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AudioOSS& self = *this;
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AudioOSS(Audio& super) : AudioDriver(super) {}
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~AudioOSS() { terminate(); }
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auto create() -> bool override {
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super.setDevice("/dev/dsp");
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super.setChannels(2);
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super.setFrequency(48000);
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super.setLatency(3);
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buffer.resize(64);
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return initialize();
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}
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auto driver() -> string override { return "OSS"; }
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auto ready() -> bool override { return _fd >= 0; }
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auto hasBlocking() -> bool override { return true; }
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auto hasDynamic() -> bool override { return true; }
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auto hasDevices() -> vector<string> override {
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vector<string> devices;
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devices.append("/dev/dsp");
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for(auto& device : directory::files("/dev/", "dsp?*")) devices.append(string{"/dev/", device});
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return devices;
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}
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auto hasChannels() -> vector<uint> override {
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return {1, 2};
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}
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auto hasFrequencies() -> vector<uint> override {
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return {44100, 48000, 96000};
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}
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auto hasLatencies() -> vector<uint> override {
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return {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
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}
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auto setDevice(string device) -> bool override { return initialize(); }
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auto setBlocking(bool blocking) -> bool override { return updateBlocking(); }
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auto setChannels(uint channels) -> bool override { return initialize(); }
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auto setFrequency(uint frequency) -> bool override { return initialize(); }
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auto setLatency(uint latency) -> bool override { return initialize(); }
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auto clear() -> void override {
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buffer.resize(64);
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}
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auto level() -> double override {
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audio_buf_info info;
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ioctl(_fd, SNDCTL_DSP_GETOSPACE, &info);
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return (double)(_bufferSize - info.bytes) / _bufferSize;
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}
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auto output(const double samples[]) -> void override {
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for(uint n : range(self.channels)) {
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buffer.write(sclamp<16>(samples[n] * 32767.0));
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if(buffer.full()) {
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write(_fd, buffer.data(), buffer.capacity<uint8_t>());
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buffer.flush();
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}
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}
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}
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private:
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auto initialize() -> bool {
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terminate();
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if(!hasDevices().find(self.device)) self.device = hasDevices().first();
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_fd = open(self.device, O_WRONLY, O_NONBLOCK);
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if(_fd < 0) return false;
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int cooked = 1;
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ioctl(_fd, SNDCTL_DSP_COOKEDMODE, &cooked);
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//policy: 0 = minimum latency (higher CPU usage); 10 = maximum latency (lower CPU usage)
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int policy = min(10, self.latency);
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ioctl(_fd, SNDCTL_DSP_POLICY, &policy);
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int channels = self.channels;
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ioctl(_fd, SNDCTL_DSP_CHANNELS, &channels);
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ioctl(_fd, SNDCTL_DSP_SETFMT, &_format);
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int frequency = self.frequency;
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ioctl(_fd, SNDCTL_DSP_SPEED, &frequency);
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updateBlocking();
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audio_buf_info info;
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ioctl(_fd, SNDCTL_DSP_GETOSPACE, &info);
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_bufferSize = info.bytes;
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return true;
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}
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auto terminate() -> void {
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if(!ready()) return;
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close(_fd);
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_fd = -1;
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}
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auto updateBlocking() -> bool {
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if(!ready()) return false;
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auto flags = fcntl(_fd, F_GETFL);
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if(flags < 0) return false;
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self.blocking ? flags &=~ O_NONBLOCK : flags |= O_NONBLOCK;
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fcntl(_fd, F_SETFL, flags);
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return true;
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}
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int _fd = -1;
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int _format = AFMT_S16_LE;
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int _bufferSize = 1;
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queue<int16_t> buffer;
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};
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