audio.cc

Linux下比较早的基于命令行的DVD播放器

//
// Copyright (c) 2002 by Istv醤 V醨adi
//
// This file is part of dxr3Player, a DVD player written specifically 
// for the DXR3 (aka Hollywood+) decoder card.

// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

//------------------------------------------------------------------------------

#include "Audio.h"
#include "DXR3.h"

#include "util/Log.h"

#include <linux/em8300.h>
#include <linux/soundcard.h>

//------------------------------------------------------------------------------

using dxr3::Audio;

//------------------------------------------------------------------------------

void Audio::executeCommand(int command)
{
    dxr3.executeCommand(27, command, 28, command);
    // FIXME: register constants
}

//------------------------------------------------------------------------------

void Audio::initialize(unsigned deviceNumber)
{
    stream.open(deviceNumber, O_RDWR|O_NONBLOCK, "ma");
    setup(AM_ANALOGUE, 48000, true);
}

//------------------------------------------------------------------------------

void Audio::setup(audioMode_t mode, unsigned rate, bool s)
{
    audioMode  = mode;
    sampleRate = rate;
    stereo     = s;

    int dspFormat = AFMT_S16_LE;
    int dspSpeed = (int)sampleRate;
    int dspStereo = stereo ? 1 : 0;

    int ioctlMode   = 0;

    switch(audioMode) {
      case AM_ANALOGUE:
        ioctlMode = EM8300_AUDIOMODE_ANALOG;
        break;
      case AM_DIGITAL_PCM:
        ioctlMode = EM8300_AUDIOMODE_DIGITALPCM;
        break;
      case AM_DIGITAL_AC3:
        ioctlMode = EM8300_AUDIOMODE_DIGITALAC3;
        dspFormat = AFMT_AC3;
        break;
    }

    stream.ioctl(SNDCTL_DSP_SPEED, &dspSpeed, "Error setting audio sample rate to %d", dspSpeed);
    stream.ioctl(SNDCTL_DSP_STEREO, &dspStereo, "Error setting DSP stereo to %d", dspStereo);
    stream.ioctl(SNDCTL_DSP_SETFMT, &dspFormat, "Error setting audio format to %d", dspFormat);

    dxr3.dev.ioctl(EM8300_IOCTL_SET_AUDIOMODE, &ioctlMode, "Error setting audio mode to %d", ioctlMode);
}

//------------------------------------------------------------------------------

void Audio::play()
{
    executeCommand(MACOMMAND_PLAY);
}

//------------------------------------------------------------------------------

void Audio::pause()
{
    executeCommand(MACOMMAND_PAUSE);
}

//------------------------------------------------------------------------------

void Audio::stop()
{
    executeCommand(MACOMMAND_STOP);
}

//------------------------------------------------------------------------------

void Audio::flush()
{
    unsigned subDevice = EM8300_SUBDEVICE_AUDIO;
    dxr3.dev.ioctl(EM8300_IOCTL_FLUSH, &subDevice, "Error flushing audio");
}

//------------------------------------------------------------------------------