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mixer.cc
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mixer.cc
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// mixer.h - Mixer class provides control of audio mixer functions
//
// Release 1.5
// Copyright (C) 1998 Sam Hawker <[email protected]>
// Copyright (C) 2002 Gordon Fraser <[email protected]>
// This software comes with ABSOLUTELY NO WARRANTY
// This software is free software, and you are welcome to redistribute it
// under certain conditions
// See the COPYING file for details.
#include "mixer.h"
//----------------------------------------------------------------------
Mixer::Mixer(const char *device_name):
device_name(device_name),
mixer_device_number(0),
modify_counter(-1)
{
printf("Compiled with OSS version %x\n", SOUND_VERSION);
openFD();
#if SOUND_VERSION >= 0x040004
getOSSInfo();
#endif
loadChannels();
}
void Mixer::openFD() {
if ((fd = open(device_name.c_str(), O_RDONLY | O_NONBLOCK)) == -1) {
throw MixerException(device_name.c_str(), "Could not open file");
}
}
#if SOUND_VERSION >= 0x040004
void Mixer::getOSSInfo() {
if (ioctl(fd, SNDCTL_SYSINFO, &sysinfo) == -1)
throw MixerException(device_name.c_str(), "Could not get system information");
}
void Mixer::newChannel(oss_mixext& ext, int shift, int value_mask) {
channels.resize(channels.size() + 1);
Channel& channel = channels.back();
channel.num = channels.size() - 1;
channel.support = (ext.flags & MIXF_WRITEABLE) != 0;
channel.ctrl = ext.ctrl;
channel.stereo = (ext.type == MIXT_STEREOSLIDER) ||
(ext.type == MIXT_STEREOSLIDER16);
channel.records = ext.flags & MIXF_RECVOL;
channel.mask = 0;
channel.name = ext.id;
channel.label = ext.extname;
channel.muted = 0;
channel.minvalue = ext.minvalue;
channel.maxvalue = ext.maxvalue;
channel.timestamp = ext.timestamp;
channel.value_mask = value_mask;
channel.shift = shift;
}
#endif
void Mixer::loadChannels() {
#if SOUND_VERSION >= 0x040004
num_channels = mixer_device_number; // must init argument with device number
if (ioctl(fd, SNDCTL_MIX_NREXT, &num_channels) == -1)
throw MixerException(device_name.c_str(), "Could not read number of channels");
channels.reserve(num_channels);
int marker_seen = 0;
for (unsigned count = 0; count < num_channels; count++) {
oss_mixext ext;
ext.dev = mixer_device_number;
ext.ctrl = count;
if (ioctl(fd, SNDCTL_MIX_EXTINFO, &ext) == -1) {
perror("SNDCTL_MIX_EXTINFO");
continue;
}
if (ext.type == MIXT_MARKER) {
marker_seen = 1;
continue;
} else if (!marker_seen) {
continue;
}
switch (ext.type) {
case MIXT_SLIDER:
newChannel(ext, 0, ~0);
break;
case MIXT_STEREODB: // fall through
case MIXT_STEREOSLIDER:
newChannel(ext, 8, 0xff);
break;
case MIXT_STEREOSLIDER16:
newChannel(ext, 16, 0xffff);
break;
case MIXT_MONODB: // fall through
case MIXT_MONOSLIDER:
newChannel(ext, 0, 0xff);
break;
case MIXT_MONOSLIDER16:
newChannel(ext, 0, 0xffff);
break;
default:
break; // control type not supported e.g. mute, on/off, etc.
}
}
#else
num_channels = SOUND_MIXER_NRDEVICES;
char *devnames[] = SOUND_DEVICE_NAMES;
char *devlabels[] = SOUND_DEVICE_LABELS;
ioctl(fd, SOUND_MIXER_READ_DEVMASK, &devmask);
ioctl(fd, SOUND_MIXER_READ_STEREODEVS, &stmask);
ioctl(fd, SOUND_MIXER_READ_RECMASK, &recmask);
ioctl(fd, SOUND_MIXER_READ_CAPS, &caps);
channels.reserve(num_channels);
int mixmask = 1;
for (unsigned count = 0; count < num_channels; count++) {
bool support = devmask & mixmask;
if (support) {
channels.resize(channels.size() + 1);
Channel& channel = channels.back();
channel.support = support;
channel.stereo = stmask & mixmask;
channel.records = recmask & mixmask;
channel.mask = mixmask;
channel.name = devnames[count];
channel.label = devlabels[count];
channel.muted = 0;
channel.minvalue = 0;
channel.maxvalue = 256;
channel.shift = 8;
channel.value_mask = 0xff;
}
mixmask *= 2;
}
#endif
doStatus();
}
//----------------------------------------------------------------------
Mixer::~Mixer() {
close(fd);
}
//----------------------------------------------------------------------
bool Mixer::isMuted(int channel) const {
return channels[channel].muted;
}
//----------------------------------------------------------------------
void Mixer::mute(int channel) {
channels[channel].muted = channels[channel].value;
channels[channel].value = 0;
writeVol(channel);
}
//----------------------------------------------------------------------
void Mixer::unmute(int channel) {
channels[channel].value = channels[channel].muted;
channels[channel].muted = 0;
writeVol(channel);
}
//----------------------------------------------------------------------
int Mixer::find(const char *name) {
if (name == NULL)
return -1; // not found
for (unsigned i = 0; i < channels.size(); i++) {
Channel& channel = channels[i];
if (strncmp(channel.label.c_str(), name, strlen(name)) == 0)
return i;
}
return -1; // not found
}
//----------------------------------------------------------------------
// Read the value of all channels
void Mixer::doStatus() {
#if SOUND_VERSION < 0x040004
ioctl(fd, SOUND_MIXER_READ_RECSRC, &recsrc);
#endif
for (unsigned i = 0; i < channels.size(); i++) {
readVol(i);
#if SOUND_VERSION < 0x040004
channels[i].recsrc = (recsrc & channels[i].mask);
#endif
}
}
//----------------------------------------------------------------------
void Mixer::printChannel(int chan) {
Channel& channel = channels[chan];
if (channel.stereo) {
printf("Mixer value for %d '%s' is %d (%d,%d)\n", chan, channel.label.c_str(), channel.value, getLeft(chan), getRight(chan));
} else {
printf("Mixer value for %d '%s' is %d (min %d, max %d)\n", chan, channel.label.c_str(), getLeft(chan), channel.minvalue, channel.maxvalue);
}
}
//----------------------------------------------------------------------
// Return a channel's volume.
void Mixer::readVol(int chan) {
Channel& channel = channels[chan];
#if SOUND_VERSION >= 0x040004
int value;
oss_mixer_value val;
val.dev = mixer_device_number;
val.ctrl = channel.ctrl;
val.timestamp = channel.timestamp;
ioctl(fd, SNDCTL_MIX_READ, &val);
channel.value = val.value;
//printChannel(chan);
#else
ioctl(fd, MIXER_READ(chan), &channel.value);
#endif
}
//----------------------------------------------------------------------
int Mixer::getLeft(int chan) const {
const Channel& channel = channels[chan];
#if SOUND_VERSION >= 0x040004
return ((channel.value & channel.value_mask))
* 100 / channel.maxvalue;
#else
return channel.value % 256;
#endif
}
//----------------------------------------------------------------------
int Mixer::getRight(int chan) const {
#if SOUND_VERSION >= 0x040004
const Channel& channel = channels[chan];
return ((channel.value >> channel.shift) & channel.value_mask)
* 100 / channel.maxvalue;
#else
return channels[chan].value / 256;
#endif
}
//----------------------------------------------------------------------
// Write volume to device. Use setVolume, setLeft and setRight first.
void Mixer::writeVol(int chan) {
Channel& channel = channels[chan];
#if SOUND_VERSION >= 0x040004
oss_mixer_value val;
val.dev = mixer_device_number;
val.ctrl = channel.ctrl;
val.timestamp = channel.timestamp;
val.value = channels[chan].value;
ioctl(fd, SNDCTL_MIX_WRITE, &val);
#else
ioctl(fd, MIXER_WRITE(chan), &channel.value);
#endif
}
//----------------------------------------------------------------------
inline int scaleFromInput(int val, const Channel& channel) {
return (val * channel.maxvalue / 100) & channel.value_mask;
}
//----------------------------------------------------------------------
void Mixer::setLeft(int chan, int l) {
int r;
Channel& channel = channels[chan];
#if SOUND_VERSION >= 0x040004
l = scaleFromInput(l, channel);
if (channel.stereo) {
r = (channel.value >> channel.shift) & channel.value_mask; // preserve
} else {
r = l;
}
channel.value = l | (r << channel.shift);
#else
if (channel.stereo)
r = getRight(chan);
else
r = l;
channel.value = 256*r+l;
#endif
}
//----------------------------------------------------------------------
void Mixer::setRight(int chan, int r) {
int l;
#if SOUND_VERSION >= 0x040004
Channel& channel = channels[chan];
r = scaleFromInput(r, channel);
if (channel.stereo) {
l = channel.value & channel.value_mask; // preserve
} else {
l = r;
}
channel.value = l | (r << channel.shift);
#else
if (channels[chan].stereo)
l = getLeft(chan);
else
l = r;
channels[chan].value = 256*r+l;
#endif
}
//----------------------------------------------------------------------
// Return record source value for a device, optionally reading it from device
// first.
bool Mixer::readRec(int chan, bool read) {
if (read) {
ioctl(fd, SOUND_MIXER_READ_RECSRC, &recsrc);
channels[chan].recsrc = (recsrc & channels[chan].mask);
}
return channels[chan].recsrc;
}
//----------------------------------------------------------------------
// Write record source values to device. Use setRec first.
void Mixer::writeRec() {
ioctl(fd, SOUND_MIXER_WRITE_RECSRC, &recsrc);
}
//----------------------------------------------------------------------
// Make a device (not) a record source.
void Mixer::setRec(int chan, bool rec) {
if (rec) {
if (caps & SOUND_CAP_EXCL_INPUT)
recsrc = channels[chan].mask;
else
recsrc |= channels[chan].mask;
} else {
recsrc &= ~channels[chan].mask;
}
}
//----------------------------------------------------------------------
const char* Mixer::getDeviceName() const {
return device_name.c_str();
}
//----------------------------------------------------------------------
unsigned Mixer::getNumChannels() const {
return channels.size();
}
//----------------------------------------------------------------------
bool Mixer::getSupport(int chan) const {
return channels[chan].support;
}
//----------------------------------------------------------------------
bool Mixer::getStereo(int chan) const {
return channels[chan].stereo;
}
//----------------------------------------------------------------------
bool Mixer::getRecords(int chan) const {
return channels[chan].records;
}
//----------------------------------------------------------------------
const char* Mixer::getName(int chan) const {
return channels[chan].name.c_str();
}
//----------------------------------------------------------------------
const char* Mixer::getLabel(int chan) const {
return channels[chan].label.c_str();
}
//----------------------------------------------------------------------
bool Mixer::hasChanged() const {
#if SOUND_VERSION >= 0x040004
oss_mixerinfo mixer_info1;
mixer_info1.dev = mixer_device_number;
ioctl(fd, SNDCTL_MIXERINFO, &mixer_info1);
#else
struct mixer_info mixer_info1;
ioctl(fd, SOUND_MIXER_INFO, &mixer_info1);
#endif
if (mixer_info1.modify_counter == modify_counter) {
return false;
} else {
modify_counter = mixer_info1.modify_counter;
return true;
}
}