/*
 * Copyright (C) 1997-2001 Id Software, Inc.
 *
 * 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 <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/shm.h>
#include <sys/wait.h>
#include <sys/soundcard.h>
#include <stdio.h>

#include "../client/client.h"
#include "../client/snd_loc.h"

static int audio_fd = -1;
static int snd_inited;

cvar_t        *s_khz;

struct sndinfo * si;

static int tryrates[] = {
	48000, 
	44100,
	22050,
	11025
};

qboolean
SNDDMA_Init(struct sndinfo * s) 
{

	int		rc;
	int		fmt;
	int		tmp;
	int		i;
	struct		audio_buf_info info;
	int		caps;

	if (snd_inited)
		return 1;

	snd_inited = 0;

	si = s;

#if defined (__linux__)
	if(!strcmp(si->snddevice->string, "default"))  //silly alsa default
		si->snddevice->string = "/dev/dsp";
#endif
	/*
	 * open /dev/dsp, confirm capability to mmap, and get size of dma buffer
	 */
	if (audio_fd == -1) {
		audio_fd = open(si->snddevice->string, O_RDWR);

		if (audio_fd == -1) {
			perror(si->snddevice->string);
			si->Com_Printf("SNDDMA_Init: Could not open %s.\n", si->snddevice->string);
			return 0;
		}
	}
	rc = ioctl(audio_fd, SNDCTL_DSP_RESET, 0);
	if (rc == -1) {
		perror(si->snddevice->string);
		si->Com_Printf("SNDDMA_Init: Could not reset %s.\n", si->snddevice->string);
		close(audio_fd);
		audio_fd = -1;
		return 0;
	}
	if (ioctl(audio_fd, SNDCTL_DSP_GETCAPS, &caps) == -1) {
		perror(si->snddevice->string);
		si->Com_Printf("SNDDMA_Init: Sound driver too old.\n");
		close(audio_fd);
		audio_fd = -1;
		return 0;
	}
	if (!(caps & DSP_CAP_TRIGGER) || !(caps & DSP_CAP_MMAP)) {
		si->Com_Printf("SNDDMA_Init: Sorry, but your soundcard doesn't support trigger or mmap. (%08x)\n", caps);
		close(audio_fd);
		audio_fd = -1;
		return 0;
	}

	/* set sample bits & speed */	
	si->dma->samplebits = (int)si->sndbits->value;
	if (si->dma->samplebits != 16 && si->dma->samplebits != 8) {
        	ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &fmt);
        	if (fmt & AFMT_S16_LE) 
			si->dma->samplebits = 16;
        	else if (fmt & AFMT_U8) 
			si->dma->samplebits = 8;
	}
	if (si->dma->samplebits == 16) {
		rc = AFMT_S16_LE;
		rc = ioctl(audio_fd, SNDCTL_DSP_SETFMT, &rc);
		if (rc < 0) {
			perror(si->snddevice->string);
			si->Com_Printf("SNDDMA_Init: Could not support 16-bit data.  Try 8-bit.\n");
			close(audio_fd);
			audio_fd = -1;
			return 0;
		}
	} else if (si->dma->samplebits == 8) {
		rc = AFMT_U8;
		rc = ioctl(audio_fd, SNDCTL_DSP_SETFMT, &rc);
		if (rc < 0) {
			perror(si->snddevice->string);
			si->Com_Printf("SNDDMA_Init: Could not support 8-bit data.\n");
			close(audio_fd);
			audio_fd = -1;
			return 0;
		}
	} else {
		perror(si->snddevice->string);
		si->Com_Printf("SNDDMA_Init: %d-bit sound not supported.", si->dma->samplebits);
		close(audio_fd);
		audio_fd = -1;
		return 0;
	}

	si->dma->speed = (int)si->sndspeed->value;
	if (!si->dma->speed) {
		if (si->s_khz->value == 48)      si->dma->speed = 48000;
		else if (si->s_khz->value == 44) si->dma->speed = 44100;
		else if (si->s_khz->value == 22) si->dma->speed = 22050;
		else                             si->dma->speed = 11025;	
	}
	
	if (!si->dma->speed) {
		for (i=0 ; i<sizeof(tryrates)/4 ; i++)
			if (!ioctl(audio_fd, SNDCTL_DSP_SPEED, &tryrates[i]))
				break;
		si->dma->speed = tryrates[i];
	}

	si->dma->channels = (int)si->sndchannels->value;
	if (si->dma->channels < 1 || si->dma->channels > 2)
		si->dma->channels = 2;

	tmp = 0;
	if (si->dma->channels == 2)
		tmp = 1;
	rc = ioctl(audio_fd, SNDCTL_DSP_STEREO, &tmp);	/* FP: bugs here. */
	if (rc < 0) {
		perror(si->snddevice->string);
		si->Com_Printf("SNDDMA_Init: Could not set %s to stereo=%d.", si->snddevice->string,
		               si->dma->channels);
		close(audio_fd);
		audio_fd = -1;
        	return 0;
	}

	if (tmp)
		si->dma->channels = 2;
	else
		si->dma->channels = 1;

	rc = ioctl(audio_fd, SNDCTL_DSP_SPEED, &si->dma->speed);
	if (rc < 0) {
		perror(si->snddevice->string);
		si->Com_Printf("SNDDMA_Init: Could not set %s speed to %d.", si->snddevice->string,
		               si->dma->speed);
		close(audio_fd);
		audio_fd = -1;
		return 0;
	}
	if (ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info)==-1) {   
		perror("GETOSPACE");
		si->Com_Printf("SNDDMA_Init: GETOSPACE ioctl failed.\n");
		close(audio_fd);
		audio_fd = -1;
		return 0;
	}
	si->dma->samples = info.fragstotal * info.fragsize / (si->dma->samplebits/8);
	si->dma->submission_chunk = 1;

	/* memory map the dma buffer */
	if (!si->dma->buffer)
		si->dma->buffer = (unsigned char *)mmap(NULL, info.fragstotal
		         * info.fragsize, PROT_WRITE, MAP_FILE|MAP_SHARED, audio_fd, 0);
	if (!si->dma->buffer || si->dma->buffer == MAP_FAILED) {
		perror(si->snddevice->string);
		si->Com_Printf("SNDDMA_Init: Could not mmap %s.\n", si->snddevice->string);
		close(audio_fd);
		audio_fd = -1;
		return 0;
	}

	/* toggle the trigger & start her up */
	tmp = 0;
	rc = ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &tmp);
	if (rc < 0) {
		perror(si->snddevice->string);
		si->Com_Printf("SNDDMA_Init: Could not toggle. (1)\n");
		close(audio_fd);
		audio_fd = -1;
		return 0;
	}
	tmp = PCM_ENABLE_OUTPUT;
	rc = ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &tmp);
	if (rc < 0) {
	    perror(si->snddevice->string);
	    si->Com_Printf("SNDDMA_Init: Could not toggle. (2)\n");
	    close(audio_fd);
	    audio_fd = -1;
	    return 0;
	}
	
	si->dma->samplepos = 0;
	
	si->Com_Printf("Initializing OSS Sound System\n");
	si->Com_Printf("Buffer size: %d\n", info.fragstotal * info.fragsize);
	
	snd_inited = 1;
	return 1;
}

int
SNDDMA_GetDMAPos(void) 
{
	struct count_info count;

	if (!snd_inited) 
		return 0;

	if (ioctl(audio_fd, SNDCTL_DSP_GETOPTR, &count)==-1) {
		perror(si->snddevice->string);
		si->Com_Printf("SNDDMA_GetDMAPos: GETOPTR failed.\n");
		close(audio_fd);
		audio_fd = -1;
		snd_inited = 0;
		return 0;
	}

	si->dma->samplepos = count.ptr / (si->dma->samplebits / 8);

	return si->dma->samplepos;
}

/*
 * SNDDMA_Shutdown
 * Reset the sound device for exiting
 */
void 
SNDDMA_Shutdown(void) 
{
#if 0
	if (snd_inited) {
		close(audio_fd);
		audio_fd = -1;
		snd_inited = 0;
	}
#else
	si->Com_Printf("SNDDMA_Shutdown\n");
	if (snd_inited) {
		munmap (si->dma->buffer, si->dma->samples *si->dma->samplebits / 8);
		si->dma->buffer = 0L;
		close(audio_fd);
		audio_fd = -1;
		snd_inited = 0;
	}
#endif
}

/*
 * ============== SNDDMA_Submit
 *
 * Send sound to device if buffer isn't really the dma buffer ===============
 */
void
SNDDMA_Submit(void) 
{
}

void
SNDDMA_BeginPainting(void)
{
}