mirror of https://github.com/bsnes-emu/bsnes.git
114 lines
2.6 KiB
C++
114 lines
2.6 KiB
C++
/*
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audio.oss (2007-12-26)
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author: Nach
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*/
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#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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//OSS4 soundcard.h includes below SNDCTL defines, but OSS3 does not
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//However, OSS4 soundcard.h does not reside in <sys/>
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//Therefore, attempt to manually define SNDCTL values if using OSS3 header
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//Note that if the defines below fail to work on any specific platform, one can point soundcard.h
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//above to the correct location for OSS4 (usually /usr/lib/oss/include/sys/soundcard.h)
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//Failing that, one can disable OSS4 ioctl calls inside init() and remove the below defines
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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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namespace ruby {
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class pAudioOSS {
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public:
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struct {
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int fd;
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int format;
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int channels;
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const char* name;
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} device;
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struct {
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unsigned frequency;
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} settings;
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bool cap(const string& name) {
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if(name == Audio::Frequency) return true;
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return false;
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}
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any get(const string& name) {
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if(name == Audio::Frequency) return settings.frequency;
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return false;
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}
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bool set(const string& name, const any& value) {
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if(name == Audio::Frequency) {
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settings.frequency = any_cast<unsigned>(value);
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if(device.fd > 0) init();
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return true;
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}
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return false;
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}
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void sample(uint16_t sl, uint16_t sr) {
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uint32_t sample = sl + (sr << 16);
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unsigned unused = write(device.fd, &sample, 4);
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}
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void clear() {
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}
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bool init() {
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term();
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device.fd = open(device.name, O_WRONLY, O_NONBLOCK);
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if(device.fd < 0) return false;
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#if 1 //SOUND_VERSION >= 0x040000
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//attempt to enable OSS4-specific features regardless of version
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//OSS3 ioctl calls will silently fail, but sound will still work
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int cooked = 1, policy = 4; //policy should be 0 - 10, lower = less latency, more CPU usage
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ioctl(device.fd, SNDCTL_DSP_COOKEDMODE, &cooked);
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ioctl(device.fd, SNDCTL_DSP_POLICY, &policy);
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#endif
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int freq = settings.frequency;
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ioctl(device.fd, SNDCTL_DSP_CHANNELS, &device.channels);
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ioctl(device.fd, SNDCTL_DSP_SETFMT, &device.format);
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ioctl(device.fd, SNDCTL_DSP_SPEED, &freq);
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return true;
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}
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void term() {
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if(device.fd > 0) {
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close(device.fd);
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device.fd = -1;
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}
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}
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pAudioOSS() {
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device.fd = -1;
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device.format = AFMT_S16_LE;
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device.channels = 2;
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device.name = "/dev/dsp";
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settings.frequency = 22050;
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}
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~pAudioOSS() {
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term();
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}
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};
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DeclareAudio(OSS)
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};
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