volumecontrol.cpp

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#include "volumecontrol.h"
#include "config.h"

#ifdef USING_OSS
    #include <sys/ioctl.h>
    #ifdef HAVE_SYS_SOUNDCARD_H
        #include <sys/soundcard.h>
    #elif HAVE_SOUNDCARD_H
        #include <soundcard.h>
    #endif
#endif

#include <fcntl.h>
#include <cstdio>
#include <unistd.h>

#include <iostream>
using namespace std;

#include "mythcontext.h"

VolumeControl::VolumeControl(bool setstartingvolume)
{
    (void) setstartingvolume;

    mixerfd = -1;
    volume = 0;

#ifdef USING_OSS
    mute = false;
    current_mute_state = MUTE_OFF;
  
    QString device = gContext->GetSetting("MixerDevice", "/dev/mixer");
    mixerfd = open(device.ascii(), O_RDONLY);

    QString controlLabel = gContext->GetSetting("MixerControl", "PCM");

    if (controlLabel == "Master")
    {
        control = SOUND_MIXER_VOLUME;
    }
    else
    {
        control = SOUND_MIXER_PCM;
    }

    if (mixerfd < 0)
    {
        cerr << "Unable to open mixer: '" << device << "'\n";
        return;
    }

    int realvol;

    if (setstartingvolume)
    {
        volume = gContext->GetNumSetting("MasterMixerVolume", 80);
        realvol = (volume << 8) + volume;
        int ret = ioctl(mixerfd, MIXER_WRITE(SOUND_MIXER_VOLUME), &realvol);
        if (ret < 0)
            perror("Setting master volume: ");

        volume = gContext->GetNumSetting("PCMMixerVolume", 80);
        realvol = (volume << 8) + volume;
        ret = ioctl(mixerfd, MIXER_WRITE(SOUND_MIXER_PCM), &realvol);
        if (ret < 0)
            perror("Setting PCM volume: ");
    }

    internal_volume = GetCurrentVolume();
#endif
}

VolumeControl::~VolumeControl()
{
    if (mixerfd >= 0)
        close(mixerfd);
}

int VolumeControl::GetCurrentVolume(void)
{
#ifdef USING_OSS
    int realvol;
    
    if (mute)
    {
        return internal_volume;
    }
    else
    {
        int ret = ioctl(mixerfd, MIXER_READ(control), &realvol);
        if (ret < 0)
        {
            perror("Reading PCM volume: ");
        }
        volume = realvol & 0xff; // just use the left channel
        internal_volume = volume;
    }
#endif    

    return volume;
}

void VolumeControl::SetCurrentVolume(int value)
{
    (void) value;

#ifdef USING_OSS
    volume = value;

    if (volume > 100)
        volume = 100;
    if (volume < 0)
        volume = 0;

    internal_volume = volume;
    if (mixerfd >= 0)
    {
        if (!mute)
        {
            int realvol = (volume << 8) + volume;
            int ret = ioctl(mixerfd, MIXER_WRITE(control), &realvol);
            if (ret < 0)
                perror("Setting volume: ");
        }
    }

    //mute = false;

    QString controlLabel = gContext->GetSetting("MixerControl", "PCM");
    controlLabel += "MixerVolume";
    gContext->SaveSetting(controlLabel, volume);
#endif
}

void VolumeControl::AdjustCurrentVolume(int change)
{
    int newvol = GetCurrentVolume() + change;

    SetCurrentVolume(newvol);
}

void VolumeControl::SetMute(bool on)
{
    (void) on;

#ifdef USING_OSS
    int realvol;

    if (on)
    {
        realvol = 0;
    }
    else
    {
        realvol = (internal_volume << 8) + internal_volume;
    }
    if (mixerfd >= 0)
    {
        int ret = ioctl(mixerfd, MIXER_WRITE(control), &realvol);
        if (ret < 0)
            perror("Setting mute:");
    }

    mute = on;
#endif
}

void VolumeControl::ToggleMute(void)
{
    SetMute(!mute);
}

kMuteState VolumeControl::IterateMutedChannels(void)
{
// current_mute_state is initialized to "MUTE_OFF".  If individual muting
// is enabled, each call to SetMute will advance to the next state:
// MUTE_OFF -> MUTE_LEFT -> MUTE_RIGHT -> MUTE_BOTH -> MUTE_OFF
#ifdef USING_OSS
    int realvol;

    switch (current_mute_state)
    {
       case MUTE_OFF:
           current_mute_state = MUTE_LEFT;
           realvol = (internal_volume << 8) + 0;
           break;
       case MUTE_LEFT:
           current_mute_state = MUTE_RIGHT;
           realvol = (0 << 8) + internal_volume;
           break;
       case MUTE_RIGHT:
           current_mute_state = MUTE_BOTH;
           realvol = 0;
           break;
       case MUTE_BOTH:
           current_mute_state = MUTE_OFF;
           realvol = (internal_volume << 8) + internal_volume;
           break;
    }

    if (mixerfd >= 0)
    {
        int ret = ioctl(mixerfd, MIXER_WRITE(control), &realvol);
        if (ret < 0)
            perror("IterateMutedChannels:");
    }
#endif // USING_OSS

    return current_mute_state;
}

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