/* Copyright (c) 2001 Miller Puckette and others.
* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution.  */

/* this file calls Ross Bencina's and Phil Burk's Portaudio package.  It's
    the main way in for Mac OS and, with Michael Casey's help, also into
    ASIO in Windows. */


#include "m_pd.h"
#include "s_stuff.h"
#include <stdio.h>
#include <stdlib.h>
#include "portaudio.h"
#include "pablio_pd.h"

    /* LATER try to figure out how to handle default devices in portaudio;
    the way s_audio.c handles them isn't going to work here. */

#if defined(MACOSX) || defined(MSW)
#define Pa_GetDefaultInputDevice Pa_GetDefaultInputDeviceID
#define Pa_GetDefaultOutputDevice Pa_GetDefaultOutputDeviceID
#endif

    /* public interface declared in m_imp.h */

    /* implementation */
static PABLIO_Stream  *pa_stream;
static int pa_inchans, pa_outchans;
static float *pa_soundin, *pa_soundout;

#define MAX_PA_CHANS 32
#define MAX_SAMPLES_PER_FRAME MAX_PA_CHANS * DEFDACBLKSIZE

int pa_open_audio(int inchans, int outchans, int rate, t_sample *soundin,
    t_sample *soundout, int framesperbuf, int nbuffers,
    int indeviceno, int outdeviceno)
{
    PaError err;
    static int initialized;
    int j, devno, pa_indev = 0, pa_outdev = 0;

    if (!initialized)
    {
	/* Initialize PortAudio  */
	int err = Pa_Initialize();
	if ( err != paNoError ) 
	{
	    fprintf( stderr,
	    	"Error number %d occured initializing portaudio\n",
		err); 
	    fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
	    return (1);
	}
	initialized = 1;
    }
    /* post("in %d out %d rate %d device %d", inchans, outchans, rate, deviceno); */
    if (inchans != 0 && outchans != 0 && inchans != outchans)
    	error("portaudio: number of input and output channels must match");
    if (inchans > MAX_PA_CHANS)
    {
	post("input channels reduced to maximum %d", MAX_PA_CHANS);
	inchans = MAX_PA_CHANS;
    }
    if (outchans > MAX_PA_CHANS)
    {
	post("output channels reduced to maximum %d", MAX_PA_CHANS);
	outchans = MAX_PA_CHANS;
    }
    
    if (inchans > 0)
    {
	for (j = 0, devno = 0; j < Pa_CountDevices(); j++)
	{
	    const PaDeviceInfo *info = Pa_GetDeviceInfo(j);
	    if (info->maxInputChannels > 0)
	    {
		if (devno == indeviceno)
		{
		    pa_indev = j;
		    break;
		}
		devno++;
	    }
	}
    }	
    
    if (outchans > 0)
    {
	for (j = 0, devno = 0; j < Pa_CountDevices(); j++)
	{
	    const PaDeviceInfo *info = Pa_GetDeviceInfo(j);
	    if (info->maxOutputChannels > 0)
	    {
		if (devno == outdeviceno)
		{
		    pa_outdev = j;
		    break;
		}
		devno++;
	    }
	}
    }	

    if (sys_verbose)
    {
	post("input device %d, channels %d", pa_indev, inchans);
	post("output device %d, channels %d", pa_outdev, outchans);
        post("framesperbuf %d, nbufs %d", framesperbuf, nbuffers);
    }
    if (inchans && outchans)
    	err = OpenAudioStream( &pa_stream, rate, paFloat32,
	    PABLIO_READ_WRITE, inchans, framesperbuf, nbuffers,
	    	pa_indev, pa_outdev);
    else if (inchans)
    	err = OpenAudioStream( &pa_stream, rate, paFloat32,
	    PABLIO_READ, inchans, framesperbuf, nbuffers,
	    	pa_indev, pa_outdev);
    else if (outchans)
    	err = OpenAudioStream( &pa_stream, rate, paFloat32,
	    PABLIO_WRITE, outchans, framesperbuf, nbuffers,
	    	pa_indev, pa_outdev);
    else err = 0;
    if ( err != paNoError ) 
    {
	fprintf( stderr, "Error number %d occured opening portaudio stream\n",
	    err); 
	fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
	Pa_Terminate();
	sys_inchannels = sys_outchannels = 0;
	return (1);
    }
    else if (sys_verbose)
	post("... opened OK.");
    pa_inchans = inchans;
    pa_outchans = outchans;
    pa_soundin = soundin;
    pa_soundout = soundout;
    return (0);
}

void pa_close_audio( void)
{
    if (pa_inchans || pa_outchans)
    	CloseAudioStream( pa_stream );
    pa_inchans = pa_outchans = 0;
}

int pa_send_dacs(void)
{
    float samples[MAX_SAMPLES_PER_FRAME], *fp1, *fp2;
    int i, j;
    double timebefore;
    
    timebefore = sys_getrealtime();
    if ((pa_inchans && GetAudioStreamReadable(pa_stream) < DEFDACBLKSIZE) ||
        (pa_outchans && GetAudioStreamWriteable(pa_stream) < DEFDACBLKSIZE))
    {
        if (pa_inchans && pa_outchans)
        {
            int synced = 0;
            while (GetAudioStreamWriteable(pa_stream) > 2*DEFDACBLKSIZE)
            {
                for (j = 0; j < pa_outchans; j++)
                    for (i = 0, fp2 = samples + j; i < DEFDACBLKSIZE; i++,
                        fp2 += pa_outchans)
                {
                    *fp2 = 0;
                }
                synced = 1;
                WriteAudioStream(pa_stream, samples, DEFDACBLKSIZE);
            }
            while (GetAudioStreamReadable(pa_stream) > 2*DEFDACBLKSIZE)
            {
                synced = 1;
                ReadAudioStream(pa_stream, samples, DEFDACBLKSIZE);
            }
            /* if (synced)
                post("sync"); */
        }
        return (SENDDACS_NO);
    }
    if (pa_inchans)
    {
	ReadAudioStream(pa_stream, samples, DEFDACBLKSIZE);
    	for (j = 0, fp1 = pa_soundin; j < pa_inchans; j++, fp1 += DEFDACBLKSIZE)
    	    for (i = 0, fp2 = samples + j; i < DEFDACBLKSIZE; i++,
	    	fp2 += pa_inchans)
	{
	    fp1[i] = *fp2;
	}
    }
#if 0 
	{
		static int nread;
		if (nread == 0)
		{
			post("it's %f %f %f %f",
			pa_soundin[0], pa_soundin[1], pa_soundin[2], 					pa_soundin[3]);
			nread = 1000;
		}
		nread--;
	}
#endif
    if (pa_outchans)
    {
    	for (j = 0, fp1 = pa_soundout; j < pa_outchans; j++,
	    fp1 += DEFDACBLKSIZE)
    	    	for (i = 0, fp2 = samples + j; i < DEFDACBLKSIZE; i++,
	    	    fp2 += pa_outchans)
	{
	    *fp2 = fp1[i];
            fp1[i] = 0;
	}
    	WriteAudioStream(pa_stream, samples, DEFDACBLKSIZE);
    }

    if (sys_getrealtime() > timebefore + 0.002)
    {
        /* post("slept"); */
    	return (SENDDACS_SLEPT);
    }
    else return (SENDDACS_YES);
}


void pa_listdevs(void)     /* lifted from pa_devs.c in portaudio */
{
    int      i,j;
    int      numDevices;
    const    PaDeviceInfo *pdi;
    PaError  err;
    Pa_Initialize();
    numDevices = Pa_CountDevices();
    if( numDevices < 0 )
    {
	fprintf(stderr, "ERROR: Pa_CountDevices returned 0x%x\n", numDevices );
	err = numDevices;
	goto error;
    }
    fprintf(stderr, "Audio Devices:\n");
    for( i=0; i<numDevices; i++ )
    {
	pdi = Pa_GetDeviceInfo( i );
	fprintf(stderr, "device %d:", i+1 );
	fprintf(stderr, " %s;", pdi->name );
	fprintf(stderr, "%d inputs, ", pdi->maxInputChannels  );
	fprintf(stderr, "%d outputs", pdi->maxOutputChannels  );
	if ( i == Pa_GetDefaultInputDevice() )
	    fprintf(stderr, " (Default Input)");
	if ( i == Pa_GetDefaultOutputDevice() )
	    fprintf(stderr, " (Default Output)");
	fprintf(stderr, "\n");
    }

    fprintf(stderr, "\n");
    return;

error:
    fprintf( stderr, "An error occured while using the portaudio stream\n" ); 
    fprintf( stderr, "Error number: %d\n", err );
    fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );

}

    /* scanning for devices */
void pa_getdevs(char *indevlist, int *nindevs,
    char *outdevlist, int *noutdevs, int *canmulti, 
    	int maxndev, int devdescsize)
{
    int i, nin = 0, nout = 0, ndev;
    *canmulti = 1;  /* one dev each for input and output */

    Pa_Initialize();
    ndev = Pa_CountDevices();
    for (i = 0; i < ndev; i++)
    {
	const PaDeviceInfo *pdi = Pa_GetDeviceInfo(i);
	if (pdi->maxInputChannels > 0 && nin < maxndev)
	{
	    strcpy(indevlist + nin * devdescsize, pdi->name);
	    nin++;
	}
	if (pdi->maxOutputChannels > 0 && nout < maxndev)
	{
	    strcpy(outdevlist + nout * devdescsize, pdi->name);
	    nout++;
	}
    }
    *nindevs = nin;
    *noutdevs = nout;
}

