/******************************************************************************
 * ao_win32.c: Windows waveOut interface for MPlayer
 * Copyright (c) 2002 - 2004 Sascha Sommer <saschasommer@freenet.de>.
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 *****************************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include <mmsystem.h>

#include "config.h"
#include "libaf/af_format.h"
#include "audio_out.h"
#include "audio_out_internal.h"
#include "mp_msg.h"
#include "libvo/fastmemcpy.h"
#include "osdep/timer.h"

#define WAVE_FORMAT_DOLBY_AC3_SPDIF 0x0092
#define WAVE_FORMAT_EXTENSIBLE      0xFFFE

static const  GUID KSDATAFORMAT_SUBTYPE_PCM = {
	0x1,0x0000,0x0010,{0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71}
};

typedef struct {
  WAVEFORMATEX  Format;
  union {
    WORD  wValidBitsPerSample;
    WORD  wSamplesPerBlock;
    WORD  wReserved;
  } Samples;
  DWORD  dwChannelMask;
  GUID  SubFormat;
} WAVEFORMATEXTENSIBLE, *PWAVEFORMATEXTENSIBLE;

#define SPEAKER_FRONT_LEFT              0x1
#define SPEAKER_FRONT_RIGHT             0x2
#define SPEAKER_FRONT_CENTER            0x4
#define SPEAKER_LOW_FREQUENCY           0x8
#define SPEAKER_BACK_LEFT               0x10
#define SPEAKER_BACK_RIGHT              0x20
#define SPEAKER_FRONT_LEFT_OF_CENTER    0x40
#define SPEAKER_FRONT_RIGHT_OF_CENTER   0x80
#define SPEAKER_BACK_CENTER             0x100
#define SPEAKER_SIDE_LEFT               0x200
#define SPEAKER_SIDE_RIGHT              0x400
#define SPEAKER_TOP_CENTER              0x800
#define SPEAKER_TOP_FRONT_LEFT          0x1000
#define SPEAKER_TOP_FRONT_CENTER        0x2000
#define SPEAKER_TOP_FRONT_RIGHT         0x4000
#define SPEAKER_TOP_BACK_LEFT           0x8000
#define SPEAKER_TOP_BACK_CENTER         0x10000
#define SPEAKER_TOP_BACK_RIGHT          0x20000

static const int channel_mask[] = {
  SPEAKER_FRONT_LEFT   | SPEAKER_FRONT_RIGHT  | SPEAKER_LOW_FREQUENCY,
  SPEAKER_FRONT_LEFT   | SPEAKER_FRONT_CENTER | SPEAKER_FRONT_RIGHT  | SPEAKER_LOW_FREQUENCY,
  SPEAKER_FRONT_LEFT   | SPEAKER_FRONT_CENTER | SPEAKER_FRONT_RIGHT  | SPEAKER_BACK_CENTER  | SPEAKER_LOW_FREQUENCY,
  SPEAKER_FRONT_LEFT   | SPEAKER_FRONT_CENTER | SPEAKER_FRONT_RIGHT  | SPEAKER_BACK_LEFT    | SPEAKER_BACK_RIGHT     | SPEAKER_LOW_FREQUENCY
};



#define SAMPLESIZE   1024
#define BUFFER_SIZE  4096
#define BUFFER_COUNT 16


static WAVEHDR*     waveBlocks;         //pointer to our ringbuffer memory
static HWAVEOUT     hWaveOut;           //handle to the waveout device
static unsigned int buf_write=0;
static unsigned int buf_write_pos=0;
static int          full_buffers=0;
static int          buffered_bytes=0;


static ao_info_t info = 
{
	"Windows waveOut audio output",
	"win32",
	"Sascha Sommer <saschasommer@freenet.de>",
	""
};

LIBAO_EXTERN(win32)

static void CALLBACK waveOutProc(HWAVEOUT hWaveOut,UINT uMsg,DWORD dwInstance,  
    DWORD dwParam1,DWORD dwParam2)
{
	if(uMsg != WOM_DONE)
        return;
	if (full_buffers) {
		buffered_bytes-=BUFFER_SIZE;
		--full_buffers;
	} else {
		buffered_bytes=0;
	}
}

// to set/get/query special features/parameters
static int control(int cmd,void *arg)
{
	DWORD volume;
	switch (cmd)
	{
		case AOCONTROL_GET_VOLUME:
		{
			ao_control_vol_t* vol = (ao_control_vol_t*)arg;
			waveOutGetVolume(hWaveOut,&volume);
			vol->left = (float)(LOWORD(volume)/655.35);
			vol->right = (float)(HIWORD(volume)/655.35);
			mp_msg(MSGT_AO, MSGL_DBG2,"ao_win32: volume left:%f volume right:%f\n",vol->left,vol->right);
			return CONTROL_OK;
		}
		case AOCONTROL_SET_VOLUME:
		{
			ao_control_vol_t* vol = (ao_control_vol_t*)arg;
			volume = MAKELONG(vol->left*655.35,vol->right*655.35);
			waveOutSetVolume(hWaveOut,volume);
			return CONTROL_OK;
		}
	}
    return -1;
}

// open & setup audio device
// return: 1=success 0=fail
static int init(int rate,int channels,int format,int flags)
{
	WAVEFORMATEXTENSIBLE wformat;      
	DWORD totalBufferSize = (BUFFER_SIZE + sizeof(WAVEHDR)) * BUFFER_COUNT;
	MMRESULT result;
	unsigned char* buffer;
	int i;
   
	switch(format){
		case AF_FORMAT_AC3:
		case AF_FORMAT_S24_LE:
		case AF_FORMAT_S16_LE:
		case AF_FORMAT_S8:
			break;
		default:
			mp_msg(MSGT_AO, MSGL_V,"ao_win32: format %s not supported defaulting to Signed 16-bit Little-Endian\n",af_fmt2str_short(format));
			format=AF_FORMAT_S16_LE;
	}   

	// FIXME multichannel mode is buggy
	if(channels > 2)
		channels = 2;
   
	//fill global ao_data 
	ao_data.channels=channels;
	ao_data.samplerate=rate;
	ao_data.format=format;
	ao_data.bps=channels*rate;
	if(format != AF_FORMAT_U8 && format != AF_FORMAT_S8)
	  ao_data.bps*=2;
	if(ao_data.buffersize==-1)
	{
		ao_data.buffersize=af_fmt2bits(format)/8;
        ao_data.buffersize*= channels;
		ao_data.buffersize*= SAMPLESIZE;
	}
	mp_msg(MSGT_AO, MSGL_V,"ao_win32: Samplerate:%iHz Channels:%i Format:%s\n",rate, channels, af_fmt2str_short(format));
    mp_msg(MSGT_AO, MSGL_V,"ao_win32: Buffersize:%d\n",ao_data.buffersize);
	
	//fill waveformatex
    ZeroMemory( &wformat, sizeof(WAVEFORMATEXTENSIBLE));
    wformat.Format.cbSize          = (channels>2)?sizeof(WAVEFORMATEXTENSIBLE)-sizeof(WAVEFORMATEX):0;
    wformat.Format.nChannels       = channels;                
    wformat.Format.nSamplesPerSec  = rate;            
    if(format == AF_FORMAT_AC3)
    {
        wformat.Format.wFormatTag      = WAVE_FORMAT_DOLBY_AC3_SPDIF;
        wformat.Format.wBitsPerSample  = 16;
        wformat.Format.nBlockAlign     = 4;
    }
    else 
    {
        wformat.Format.wFormatTag      = (channels>2)?WAVE_FORMAT_EXTENSIBLE:WAVE_FORMAT_PCM;
        wformat.Format.wBitsPerSample  = af_fmt2bits(format); 
        wformat.Format.nBlockAlign     = wformat.Format.nChannels * (wformat.Format.wBitsPerSample >> 3);
    }
	if(channels>2)
	{
        wformat.dwChannelMask = channel_mask[channels-3];
        wformat.SubFormat = KSDATAFORMAT_SUBTYPE_PCM;
	    wformat.Samples.wValidBitsPerSample=af_fmt2bits(format);
    }
  
    wformat.Format.nAvgBytesPerSec = wformat.Format.nSamplesPerSec * wformat.Format.nBlockAlign;
 	
    //open sound device
    //WAVE_MAPPER always points to the default wave device on the system
    result = waveOutOpen(&hWaveOut,WAVE_MAPPER,(WAVEFORMATEX*)&wformat,(DWORD_PTR)waveOutProc,0,CALLBACK_FUNCTION);
	if(result == WAVERR_BADFORMAT)
	{
		mp_msg(MSGT_AO, MSGL_ERR,"ao_win32: format not supported switching to default\n");
        ao_data.channels = wformat.Format.nChannels = 2;
	    ao_data.samplerate = wformat.Format.nSamplesPerSec = 44100;
	    ao_data.format = AF_FORMAT_S16_LE;
		ao_data.bps=ao_data.channels * ao_data.samplerate*2;
	    wformat.Format.wBitsPerSample=16;
        wformat.Format.wFormatTag=WAVE_FORMAT_PCM;
		wformat.Format.nBlockAlign     = wformat.Format.nChannels * (wformat.Format.wBitsPerSample >> 3);
        wformat.Format.nAvgBytesPerSec = wformat.Format.nSamplesPerSec * wformat.Format.nBlockAlign;
		ao_data.buffersize=(wformat.Format.wBitsPerSample>>3)*wformat.Format.nChannels*SAMPLESIZE;
        result = waveOutOpen(&hWaveOut,WAVE_MAPPER,(WAVEFORMATEX*)&wformat,(DWORD_PTR)waveOutProc,0,CALLBACK_FUNCTION);
	}
	if(result != MMSYSERR_NOERROR)
	{
		mp_msg(MSGT_AO, MSGL_ERR,"ao_win32: unable to open wave mapper device (result=%i)\n",result);
		return 0;
    }
	//allocate buffer memory as one big block
	buffer = malloc(totalBufferSize);
	memset(buffer,0x0,totalBufferSize);
    //and setup pointers to each buffer 
    waveBlocks = (WAVEHDR*)buffer;
    buffer += sizeof(WAVEHDR) * BUFFER_COUNT;
    for(i = 0; i < BUFFER_COUNT; i++) {
        waveBlocks[i].lpData = buffer;
        buffer += BUFFER_SIZE;
    }
    buf_write=0;
    buf_write_pos=0;
    full_buffers=0;
    buffered_bytes=0;

    return 1;
}

// close audio device
static void uninit(int immed)
{
    if(!immed)while(buffered_bytes > 0)usec_sleep(50000);
    else buffered_bytes=0;
	waveOutReset(hWaveOut);
	waveOutClose(hWaveOut);
	mp_msg(MSGT_AO, MSGL_V,"waveOut device closed\n");
    free(waveBlocks);
	mp_msg(MSGT_AO, MSGL_V,"buffer memory freed\n");
}

// stop playing and empty buffers (for seeking/pause)
static void reset(void)
{
   	waveOutReset(hWaveOut);
	buf_write=0;
    buf_write_pos=0;
	full_buffers=0;
	buffered_bytes=0;
}

// stop playing, keep buffers (for pause)
static void audio_pause(void)
{
    waveOutPause(hWaveOut);
}

// resume playing, after audio_pause()
static void audio_resume(void)
{
	waveOutRestart(hWaveOut);
}

// return: how many bytes can be played without blocking
static int get_space(void)
{
    return BUFFER_COUNT*BUFFER_SIZE - buffered_bytes;
}

//writes data into buffer, based on ringbuffer code in ao_sdl.c
static int write_waveOutBuffer(unsigned char* data,int len){
  WAVEHDR* current;
  int len2=0;
  int x;
  while(len>0){                       
    current = &waveBlocks[buf_write];
    if(buffered_bytes==BUFFER_COUNT*BUFFER_SIZE) break;
    //unprepare the header if it is prepared
	if(current->dwFlags & WHDR_PREPARED) 
           waveOutUnprepareHeader(hWaveOut, current, sizeof(WAVEHDR));
	x=BUFFER_SIZE-buf_write_pos;          
    if(x>len) x=len;                   
    memcpy(current->lpData+buf_write_pos,data+len2,x); 
    if(buf_write_pos==0)full_buffers++;
    len2+=x; len-=x;                 
	buffered_bytes+=x; buf_write_pos+=x; 
	//prepare header and write data to device
	current->dwBufferLength = buf_write_pos;
	waveOutPrepareHeader(hWaveOut, current, sizeof(WAVEHDR));
	waveOutWrite(hWaveOut, current, sizeof(WAVEHDR));
    
	if(buf_write_pos>=BUFFER_SIZE){        //buffer is full find next
       // block is full, find next!
       buf_write=(buf_write+1)%BUFFER_COUNT;  
	   buf_write_pos=0;                 
    }                                 
  }
  return len2;
}

// plays 'len' bytes of 'data'
// it should round it down to outburst*n
// return: number of bytes played
static int play(void* data,int len,int flags)
{
	if (!(flags & AOPLAY_FINAL_CHUNK))
	len = (len/ao_data.outburst)*ao_data.outburst;
	return write_waveOutBuffer(data,len);
}

// return: delay in seconds between first and last sample in buffer
static float get_delay(void)
{
	return (float)(buffered_bytes + ao_data.buffersize)/(float)ao_data.bps;
}
