portaudio_a.c

MIDI解码程序(用VC编写)

/*
    TiMidity++ -- MIDI to WAVE converter and player
    Copyright (C) 1999-2002 Masanao Izumo <[e-mail]>
    Copyright (C) 1995 Tuukka Toivonen <[e-mail]>

    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

    portaudio_a.c by Avatar <[e-mail]>
    based on esd_a.c

    Functions to play sound through EsounD
*/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */
#define _GNU_SOURCE
#include <stdio.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /* HAVE_UNISTD_H */
#include <fcntl.h>

#ifndef NO_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif

//#include <windows.h>
#include <portaudio.h>

#ifdef AU_PORTAUDIO_DLL
#include "w32_portaudio.h"
#endif

#include "timidity.h"
#include "common.h"
#include "output.h"
#include "controls.h"
#include "timer.h"
#include "instrum.h"
#include "playmidi.h"
#include "miditrace.h"

#define DATA_BLOCK_SIZE     (27648*4) /* WinNT Latency is 600 msec read pa_dsound.c */
#define SAMPLE_RATE         (44100)

static int open_output(void); /* 0=success, 1=warning, -1=fatal error */
static void close_output(void);
static int output_data(char *buf, int32 nbytes);
static int acntl(int request, void *arg);

static int framesPerBuffer=256;
static int stereo=2;
static int data_nbyte;
static int numBuffers;
static unsigned int framesPerInBuffer;
static unsigned int bytesPerInBuffer=0;
//static int  firsttime;
static int pa_active=0;
static int first=1;
PaDeviceID DeviceID;
const PaDeviceInfo *DeviceInfo;
PortAudioStream *stream;
PaError  err;
typedef struct {
	char buf[DATA_BLOCK_SIZE*2];
	int32 samplesToGo;
	char *bufpoint;
	char *bufepoint;
} padata_t;
padata_t pa_data;

/* export the playback mode */

#ifdef AU_PORTAUDIO_DLL
static int open_output_asio(void);
static int open_output_win_ds(void);
static int open_output_win_wmme(void);
PlayMode portaudio_asio_play_mode = {
	(SAMPLE_RATE),
    PE_16BIT|PE_SIGNED,
    PF_PCM_STREAM|PF_BUFF_FRAGM_OPT/*|PF_CAN_TRACE*/,
    -1,
    {32}, /* PF_BUFF_FRAGM_OPT  is need for TWSYNTH */
	"PortAudio(ASIO)", 'o',
    NULL,
    open_output_asio,
    close_output,
    output_data,
    acntl
};
PlayMode portaudio_win_ds_play_mode = {
	(SAMPLE_RATE),
    PE_16BIT|PE_SIGNED,
    PF_PCM_STREAM|PF_BUFF_FRAGM_OPT/*|PF_CAN_TRACE*/,
    -1,
    {32}, /* PF_BUFF_FRAGM_OPT  is need for TWSYNTH */
	"PortAudio(DirectSound)", 'P',
    NULL,
    open_output_win_ds,
    close_output,
    output_data,
    acntl
};
PlayMode portaudio_win_wmme_play_mode = {
	(SAMPLE_RATE),
    PE_16BIT|PE_SIGNED,
    PF_PCM_STREAM|PF_BUFF_FRAGM_OPT/*|PF_CAN_TRACE*/,
    -1,
    {32}, /* PF_BUFF_FRAGM_OPT  is need for TWSYNTH */
	"PortAudio(WMME)", 'p',
    NULL,
    open_output_win_wmme,
    close_output,
    output_data,
    acntl
};
PlayMode * volatile portaudio_play_mode = &portaudio_win_wmme_play_mode;
#define dpm (*portaudio_play_mode)

#else

#define dpm portaudio_play_mode

PlayMode dpm = {
	(SAMPLE_RATE),
    PE_16BIT|PE_SIGNED,
    PF_PCM_STREAM|PF_BUFF_FRAGM_OPT/*|PF_CAN_TRACE*/,
    -1,
    {32}, /* PF_BUFF_FRAGM_OPT  is need for TWSYNTH */
	"Portaudio Driver", 'p',
    NULL,
    open_output,
    close_output,
    output_data,
    acntl
};
#endif


int paCallback(  void *inputBuffer, void *outputBuffer,

                     unsigned long framesPerBuffer,

                     PaTimestamp outTime, void *userData )

{

    unsigned int i;
	int finished = 0;

/* Cast data passed through stream to our structure type. */

//    pa_data_t pa_data = (pa_data_t*)userData;

    char *out = (char*)outputBuffer;
	if(pa_data.samplesToGo < framesPerBuffer*data_nbyte*stereo  ){
		for(i=0;i<pa_data.samplesToGo;i++){
			*out++ = *(pa_data.bufpoint)++;
			if( pa_data.buf+bytesPerInBuffer*2 <= pa_data.bufpoint ){
				pa_data.bufpoint=pa_data.buf;
			}
		}
		pa_data.samplesToGo=0;
		for(;i<framesPerBuffer*data_nbyte*stereo;i++){
			*out++=0;
		}
		finished = 0;
	}else{
		for(i=0;i<framesPerBuffer*data_nbyte*stereo;i++){
			*out++=*(pa_data.bufpoint)++;
			if( pa_data.buf+bytesPerInBuffer*2 <= pa_data.bufpoint ){
				pa_data.bufpoint=pa_data.buf;
			}
		}
		pa_data.samplesToGo -= framesPerBuffer*data_nbyte*stereo;
	}

    return finished ;

}

#ifdef AU_PORTAUDIO_DLL
static int open_output_asio(void)
{
	portaudio_play_mode = &portaudio_asio_play_mode;
	return open_output();
}
static int open_output_win_ds(void)
{
	portaudio_play_mode = &portaudio_win_ds_play_mode;
	return open_output();
}
static int open_output_win_wmme(void)
{
	portaudio_play_mode = &portaudio_win_wmme_play_mode;
	return open_output();
}
#endif

static int open_output(void)
{
	double rate;
	int n, nrates, include_enc, exclude_enc;
	PaSampleFormat SampleFormat, nativeSampleFormats;

#ifdef AU_PORTAUDIO_DLL
  {
		if(&dpm == &portaudio_asio_play_mode){
			if(load_portaudio_dll(PA_DLL_ASIO))
				return -1;
		} else if(&dpm == &portaudio_win_ds_play_mode){
			if(load_portaudio_dll(PA_DLL_WIN_DS))
				return -1;
		} else if(&dpm == &portaudio_win_wmme_play_mode){
			if(load_portaudio_dll(PA_DLL_WIN_WMME))
				return -1;
		} else {
			return -1;
		}
  }
#endif
	if(pa_active == 0){
		err = Pa_Initialize();
		if( err != paNoError ) goto error;
		pa_active = 1;
	}
	if(first == 1){
		atexit(close_output);
		first = 0;
	}

	DeviceID = Pa_GetDefaultOutputDeviceID();
	if(DeviceID==paNoDevice) goto error;
	DeviceInfo = Pa_GetDeviceInfo( DeviceID);	
	if(DeviceInfo==NULL) goto error;
	nativeSampleFormats = DeviceInfo->nativeSampleFormats;

	exclude_enc = PE_ULAW | PE_ALAW | PE_BYTESWAP;
	include_enc = PE_SIGNED;
	if (!(nativeSampleFormats & paInt16)) {exclude_enc |= PE_16BIT;}
	if (!(nativeSampleFormats & paInt24)) {exclude_enc |= PE_24BIT;}
    dpm.encoding = validate_encoding(dpm.encoding, include_enc, exclude_enc);

	if (dpm.encoding & PE_24BIT) {SampleFormat = paInt24;}
	else if (dpm.encoding & PE_16BIT) {SampleFormat = paInt16;}
	else {SampleFormat = paInt8;}

	stereo = (dpm.encoding & PE_MONO) ? 1 : 2;
	data_nbyte = (dpm.encoding & PE_16BIT) ? 2 : 1;
	data_nbyte = (dpm.encoding & PE_24BIT) ? 3 : data_nbyte;

	nrates = DeviceInfo->numSampleRates;
	if (nrates == -1) {	/* range supported */
		rate = dpm.rate;
		if (dpm.rate < DeviceInfo->sampleRates[0]) rate = DeviceInfo->sampleRates[0];
		if (dpm.rate > DeviceInfo->sampleRates[1]) rate = DeviceInfo->sampleRates[1];
	} else {
		rate = DeviceInfo->sampleRates[nrates-1];
		for (n = nrates - 1; n >= 0; n--) {	/* find nearest sample rate */
			if (dpm.rate <= DeviceInfo->sampleRates[n]) rate=DeviceInfo->sampleRates[n];
		}
	}
	dpm.rate = (int32)rate;
	
	pa_data.samplesToGo = 0;
	pa_data.bufpoint = pa_data.buf;
	pa_data.bufepoint = pa_data.buf;
//	firsttime = 1;
	numBuffers = Pa_GetMinNumBuffers( framesPerBuffer, dpm.rate );
	framesPerInBuffer = numBuffers * framesPerBuffer;
	if (framesPerInBuffer < 4096) framesPerInBuffer = 4096;
	bytesPerInBuffer = framesPerInBuffer * data_nbyte * stereo;
//	printf("%d\n",framesPerInBuffer);
//	printf("%d\n",dpm.rate);
	err = Pa_OpenDefaultStream(
    	&stream,        /* passes back stream pointer */
    	0,              /* no input channels */
    	stereo,              /* 2:stereo 1:mono output */
    	SampleFormat,      /* 24bit 16bit 8bit output */
		(double)dpm.rate,          /* sample rate */
    	framesPerBuffer,            /* frames per buffer */
    	numBuffers,              /* number of buffers, if zero then use default minimum */
    	paCallback, /* specify our custom callback */
    	&pa_data);   /* pass our data through to callback */
	if ( err != paNoError && err != paHostError) goto error;
	return 0;

error:
	Pa_Terminate(); pa_active = 0;
#ifdef AU_PORTAUDIO_DLL
  free_portaudio_dll();
#endif
	ctl->cmsg(  CMSG_ERROR, VERB_NORMAL, "PortAudio error: %s\n", Pa_GetErrorText( err ) );
	return -1;
}
static int output_data(char *buf, int32 nbytes)
{
	unsigned int i;


//	if(pa_data.samplesToGo > DATA_BLOCK_SIZE){ 
//		Sleep(  (pa_data.samplesToGo - DATA_BLOCK_SIZE)/dpm.rate/4  );
//	}
	for(i=0;i<nbytes;i++){
		*(pa_data.bufepoint)++ = *buf++ ;
		if( pa_data.buf+bytesPerInBuffer*2 <= pa_data.bufepoint ){
			pa_data.bufepoint=pa_data.buf;
		}
	}
	pa_data.samplesToGo += nbytes;

/*
	if(firsttime==1){
		err = Pa_StartStream( stream );

		if( err != paNoError ) goto error;
		firsttime=0;
	}
*/
	if( 0==Pa_StreamActive(stream)){
		err = Pa_StartStream( stream );

		if( err != paNoError ) goto error;
	}
    while(pa_data.samplesToGo > bytesPerInBuffer){ Pa_Sleep(1);};
//	Pa_Sleep( (pa_data.samplesToGo - bytesPerInBuffer)/dpm.rate * 1000);
	return 0;

error:
	Pa_Terminate(); pa_active=0;
	ctl->cmsg(CMSG_ERROR, VERB_NORMAL, "PortAudio error: %s\n", Pa_GetErrorText( err ) );
	return -1;
}

static void close_output(void)
{	
	if( pa_active==0) return;
	if(Pa_StreamActive(stream)){
		Pa_Sleep(  bytesPerInBuffer/dpm.rate*1000  );
	}	
	err = Pa_StopStream( stream );
//	if( err != paNoError ) goto error;
	err = Pa_CloseStream( stream );
//	if( err != paNoError ) goto error;
	Pa_Terminate(); 
	pa_active=0;

#ifdef AU_PORTAUDIO_DLL
  free_portaudio_dll();
#endif

	return;

error:
	Pa_Terminate(); pa_active=0;
#ifdef AU_PORTAUDIO_DLL
  free_portaudio_dll();
#endif
	ctl->cmsg(  CMSG_ERROR, VERB_NORMAL, "PortAudio error: %s\n", Pa_GetErrorText( err ) );
	return;
}

static int acntl(int request, void *arg)
{
    switch(request)
    {
      case PM_REQ_GETQSIZ:
		 *(int *)arg = bytesPerInBuffer*2;
    	return 0;
		break;
      case PM_REQ_GETFILLABLE:
		 *(int *)arg = bytesPerInBuffer*2-pa_data.samplesToGo;
    	return 0;
		break;
      case PM_REQ_GETFILLED:
		 *(int *)arg = pa_data.samplesToGo;
    	return 0;
		break;
      case PM_REQ_DISCARD:
    	Pa_StopStream( stream );
    	close_output();
	    open_output();
		return 0;
		break;
      case PM_REQ_FLUSH:
    	close_output();
	    open_output();
		return 0;
		break;
      case PM_REQ_RATE:  /* NOT WORK */
    	{
    		int i;
    		double sampleRateBack;
    		i = *(int *)arg; /* sample rate in and out */
    		close_output();
    		sampleRateBack=dpm.rate;
    		dpm.rate=i;
    		if(0==open_output()){
    			return 0;
    		}else{    		
    			dpm.rate=sampleRateBack;
    			open_output();
    			return -1;
    		}
    	}
    	break;
    }
    return -1;
}