ao_oss.c

DawnLightPlayer,一个新的基于ffmpeg的全功能播放器

/**********************************************
 * Dawn Light Player
 *
 *   ao_oss.c
 *
 * Created by kf701
 * 22:44:23 02/29/08 CST
 *
 * $Id: ao_oss.c 168 2008-03-21 02:50:01Z kf701 $
 **********************************************/

#if ENABLE_AO_OSS

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/soundcard.h>

#include "avoutput.h"
#include "global.h"

static char *dsp_dev = "/dev/dsp";
static char *mixer_dev = "/dev/mixer";

static int dsp;

static int format2oss(int format)
{
	switch (format)
	{
	case SAMPLE_FMT_U8:
		return AFMT_U8;
	case SAMPLE_FMT_S16:
		return AFMT_S16_LE;
#ifdef AFMT_S24_LE
	case SAMPLE_FMT_S24:
		return AFMT_S24_LE;
#endif
#ifdef AFMT_S32_LE
	case SAMPLE_FMT_S32:
		return AFMT_S32_LE;
#endif
#ifdef AFMT_FLOAT
	case SAMPLE_FMT_FLT:
		return AFMT_FLOAT;
#endif
	}
	return -1;
}

static int ao_oss_init(void)
{
	int i;

	dsp = open(dsp_dev, O_WRONLY);
	if ( dsp < 0 )
	{
		av_log(NULL, AV_LOG_ERROR, "open oss device faild\n");
		return -1;
	}

	i = dlpctxp->sample_rate;
	ioctl (dsp, SNDCTL_DSP_SPEED, &i);
	i = format2oss(dlpctxp->sample_fmt);
	ioctl(dsp, SNDCTL_DSP_SETFMT, &i);
	i = dlpctxp->channels;
	if ( i > 2 ) i = 2;
	ioctl(dsp, SNDCTL_DSP_CHANNELS, &i);

	return 0;
}

static int ao_oss_uninit(void)
{
	close(dsp);
	return 0;
}

static void ao_oss_play(AVSample *s)
{
	write(dsp, s->data, s->size);
}

static int ao_oss_control(int cmd, void *arg)
{
	int mixer, value;

	switch (cmd)
	{
	case AO_GET_VOLUME:
	{
		mixer = open(mixer_dev, O_RDWR);
		if ( mixer < 0 )
			return 0;
		ioctl(mixer, MIXER_READ(0), &value);
		close( mixer );
		return value / 257;
	}
	case AO_ADD_VOLUME:
	{
		mixer = open(mixer_dev, O_RDWR);
		if ( mixer < 0 )
			return 0;
		ioctl(mixer, MIXER_READ(0), &value);
		value = (value / 257 + 5) * 257;
		ioctl(mixer, MIXER_WRITE(0), &value);
		av_log(NULL, AV_LOG_INFO, "Change Volume to %d \r", value/257);
		close( mixer );
		break;
	}
	case AO_SUB_VOLUME:
	{
		mixer = open(mixer_dev, O_RDWR);
		if ( mixer < 0 )
			return 0;
		ioctl(mixer, MIXER_READ(0), &value);
		value = (value / 257 - 5) * 257;
		if ( value < 0 ) value = 0;
		ioctl(mixer, MIXER_WRITE(0), &value);
		av_log(NULL, AV_LOG_INFO, "Change Volume to %d \r", value/257);
		close( mixer );
		break;
	}
	default:
	{
		av_log(NULL, AV_LOG_INFO, "OSS control CMD not support now!\n");
		break;
	}
	}
	return 0;
}

ao_t ao_oss =
{
	.id = AO_ID_OSS,
	.name = "oss",
	.ao_init = ao_oss_init,
	.ao_uninit = ao_oss_uninit,
	.ao_play = ao_oss_play,
	.ao_getspace = NULL,
	.ao_control = ao_oss_control,
};

#endif /* ENABLE_AO_OSS */