/* 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"

#ifdef MACOSX
#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;
    
    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 (sys_verbose)
	post("portaudio: opening for %d channels in, %d out",
		inchans, outchans);
    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 (indeviceno < 0)
    	indeviceno = Pa_GetDefaultInputDevice();
    if (outdeviceno < 0)
    	outdeviceno = Pa_GetDefaultOutputDevice();
	
    fprintf(stderr, "input device %d, output device %d\n",
    	indeviceno, outdeviceno);
    if (inchans && outchans)
    	err = OpenAudioStream( &pa_stream, rate, paFloat32,
	    PABLIO_READ_WRITE, inchans, framesperbuf, nbuffers,
	    	indeviceno, outdeviceno);
    else if (inchans)
    	err = OpenAudioStream( &pa_stream, rate, paFloat32,
	    PABLIO_READ, inchans, framesperbuf, nbuffers,
	    	indeviceno, outdeviceno);
    else if (outchans)
    	err = OpenAudioStream( &pa_stream, rate, paFloat32,
	    PABLIO_WRITE, outchans, framesperbuf, nbuffers,
	    	indeviceno, outdeviceno);
    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();
	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)
    {
    	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 (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)
    	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 ) );

}