C++ Pa_GetStreamInfo函数代码示例

/* API: get capability */
static pj_status_t strm_get_cap(pjmedia_aud_stream *s,
	 		        pjmedia_aud_dev_cap cap,
			        void *pval)
{
    struct pa_aud_stream *strm = (struct pa_aud_stream*)s;

    PJ_ASSERT_RETURN(strm && pval, PJ_EINVAL);

    if (cap==PJMEDIA_AUD_DEV_CAP_INPUT_LATENCY && strm->rec_strm) {
	const PaStreamInfo *si = Pa_GetStreamInfo(strm->rec_strm);
	if (!si)
	    return PJMEDIA_EAUD_SYSERR;

	*(unsigned*)pval = (unsigned)(si->inputLatency * 1000);
	return PJ_SUCCESS;
    } else if (cap==PJMEDIA_AUD_DEV_CAP_OUTPUT_LATENCY && strm->play_strm) {
	const PaStreamInfo *si = Pa_GetStreamInfo(strm->play_strm);
	if (!si)
	    return PJMEDIA_EAUD_SYSERR;

	*(unsigned*)pval = (unsigned)(si->outputLatency * 1000);
	return PJ_SUCCESS;
    } else {
	return PJMEDIA_EAUD_INVCAP;
    }
}

/*
 * Get stream info.
 */
PJ_DEF(pj_status_t) pjmedia_snd_stream_get_info(pjmedia_snd_stream *strm,
						pjmedia_snd_stream_info *pi)
{
    const PaStreamInfo *paPlaySI = NULL, *paRecSI = NULL;

    PJ_ASSERT_RETURN(strm && pi, PJ_EINVAL);
    PJ_ASSERT_RETURN(strm->play_strm || strm->rec_strm, PJ_EINVALIDOP);

    if (strm->play_strm) {
	paPlaySI = Pa_GetStreamInfo(strm->play_strm);
    }
    if (strm->rec_strm) {
	paRecSI = Pa_GetStreamInfo(strm->rec_strm);
    }

    pj_bzero(pi, sizeof(*pi));
    pi->dir = strm->dir;
    pi->play_id = strm->play_id;
    pi->rec_id = strm->rec_id;
    pi->clock_rate = (unsigned)(paPlaySI ? paPlaySI->sampleRate : 
				paRecSI->sampleRate);
    pi->channel_count = strm->channel_count;
    pi->samples_per_frame = strm->samples_per_frame;
    pi->bits_per_sample = strm->bytes_per_sample * 8;
    pi->rec_latency = (unsigned)(paRecSI ? paRecSI->inputLatency * 
					   paRecSI->sampleRate : 0);
    pi->play_latency = (unsigned)(paPlaySI ? paPlaySI->outputLatency * 
					     paPlaySI->sampleRate : 0);

    return PJ_SUCCESS;
}

/** 
 * Initializes PortAudio with a callback that fills output buffers mixed by the Kowalski Engine.
 * @param engine
 * @param sampleRate
 * @param numChannels
 * @param bufferSize
 * @return A Kowalski error code.
 */
kwlError kwlEngine_hostSpecificInitialize(kwlEngine* engine, int sampleRate, int numOutChannels, int numInChannels, int bufferSize)
{
    PaError err = Pa_Initialize();
    KWL_ASSERT(err == paNoError && "error initializing portaudio");
    
    /* Open an audio I/O stream. */
    err = Pa_OpenDefaultStream(&stream,
                               numInChannels,
                               numOutChannels,
                               paFloat32,   /* 32 bit floating point output. */
                               sampleRate,
                               bufferSize, /* frames per buffer, i.e. the number
                                            of sample frames that PortAudio will
                                            request from the callback. Many apps
                                            may want to use
                                            paFramesPerBufferUnspecified, which
                                            tells PortAudio to pick the best,
                                            possibly changing, buffer size.*/
                               (PaStreamCallback*)&paCallback,
                               engine->mixer);
    //printf("PortAudio error: %s\n", Pa_GetErrorText(err));
    KWL_ASSERT(err == paNoError);
    
    err = Pa_StartStream(stream);
    //printf("PortAudio error: %s\n", Pa_GetErrorText(err));
    KWL_ASSERT(err == paNoError);

	const PaStreamInfo* si = Pa_GetStreamInfo(stream);

    return KWL_NO_ERROR;
}

void JackPortAudioDriver::UpdateLatencies()
{
    jack_latency_range_t input_range;
    jack_latency_range_t output_range;
    jack_latency_range_t monitor_range;

    const PaStreamInfo* info = Pa_GetStreamInfo(fStream);
    assert(info);

    for (int i = 0; i < fCaptureChannels; i++) {
        input_range.max = input_range.min = fEngineControl->fBufferSize + (info->inputLatency * fEngineControl->fSampleRate) + fCaptureLatency;
        fGraphManager->GetPort(fCapturePortList[i])->SetLatencyRange(JackCaptureLatency, &input_range);
    }

    for (int i = 0; i < fPlaybackChannels; i++) {
        output_range.max = output_range.min = (info->outputLatency * fEngineControl->fSampleRate) + fPlaybackLatency;
        if (fEngineControl->fSyncMode) {
            output_range.max = output_range.min += fEngineControl->fBufferSize;
        } else {
            output_range.max = output_range.min += fEngineControl->fBufferSize * 2;
        }
        fGraphManager->GetPort(fPlaybackPortList[i])->SetLatencyRange(JackPlaybackLatency, &output_range);
        if (fWithMonitorPorts) {
            monitor_range.min = monitor_range.max = fEngineControl->fBufferSize;
            fGraphManager->GetPort(fMonitorPortList[i])->SetLatencyRange(JackCaptureLatency, &monitor_range);
        }
    }
}

void DevicePortAudio::deviceInputOpen( const PaDeviceInfo *DevInf )
{
	deviceInputClose();

	PaStreamParameters	 StrPrm;

	memset( &StrPrm, 0, sizeof( StrPrm ) );

	StrPrm.device           = mDeviceIndex;
	StrPrm.channelCount     = DevInf->maxInputChannels;
	StrPrm.sampleFormat     = paNonInterleaved | paFloat32;
	StrPrm.suggestedLatency = DevInf->defaultLowInputLatency;

	if( Pa_OpenStream( &mStreamInput, &StrPrm, nullptr, outputSampleRate(), paFramesPerBufferUnspecified, paNoFlag, &DevicePortAudio::streamCallbackStatic, this ) != paNoError )
	{
		return;
	}

	mInputChannelCount = DevInf->maxInputChannels;

	const PaStreamInfo	*StreamInfo = Pa_GetStreamInfo( mStreamInput );

	qDebug() << DevInf->name << StreamInfo->sampleRate << StreamInfo->inputLatency << mInputChannelCount;

	mInputSampleRate   = StreamInfo->sampleRate;
	mInputTimeLatency  = StreamInfo->inputLatency;
	mInputAudioOffset  = 0; //QDateTime::currentMSecsSinceEpoch() * qint64( mSampleRate / 1000.0 );
	mInputSampleFormat = fugio::AudioSampleFormat::Format32FS;

	if( Pa_StartStream( mStreamInput ) != paNoError )
	{
		return;
	}
}

static ALCboolean pa_reset_playback(ALCdevice *device)
{
    pa_data *data = (pa_data*)device->ExtraData;
    const PaStreamInfo *streamInfo;
    PaError err;

    streamInfo = Pa_GetStreamInfo(data->stream);
    if(device->Frequency != streamInfo->sampleRate)
    {
        if((device->Flags&DEVICE_FREQUENCY_REQUEST))
            ERR("PortAudio does not support changing sample rates (wanted %dhz, got %.1fhz)\n", device->Frequency, streamInfo->sampleRate);
        device->Flags &= ~DEVICE_FREQUENCY_REQUEST;
        device->Frequency = streamInfo->sampleRate;
    }
    device->UpdateSize = data->update_size;

    err = Pa_StartStream(data->stream);
    if(err != paNoError)
    {
        ERR("Pa_StartStream() returned an error: %s\n", Pa_GetErrorText(err));
        return ALC_FALSE;
    }

    return ALC_TRUE;
}

PaError paqaCheckLatency( PaStreamParameters *outputParamsPtr, 
                         paTestData *dataPtr, double sampleRate, unsigned long framesPerBuffer )
{
    PaError err;
    PaStream *stream;
    const PaStreamInfo* streamInfo;

    dataPtr->minFramesPerBuffer = 9999999;
    dataPtr->maxFramesPerBuffer = 0;
    dataPtr->minDeltaDacTime = 9999999.0;
    dataPtr->maxDeltaDacTime = 0.0;
    dataPtr->callbackCount = 0;
    
    printf("Stream parameter: suggestedOutputLatency = %g\n", outputParamsPtr->suggestedLatency );
    if( framesPerBuffer == paFramesPerBufferUnspecified ){
        printf("Stream parameter: user framesPerBuffer = paFramesPerBufferUnspecified\n" );
    }else{
        printf("Stream parameter: user framesPerBuffer = %lu\n", framesPerBuffer );
    }
    err = Pa_OpenStream(
                        &stream,
                        NULL, /* no input */
                        outputParamsPtr,
                        sampleRate,
                        framesPerBuffer,
                        paClipOff,      /* we won't output out of range samples so don't bother clipping them */
                        patestCallback,
                        dataPtr );
    if( err != paNoError ) goto error1;
    
    streamInfo = Pa_GetStreamInfo( stream );
    printf("Stream info: inputLatency  = %g\n", streamInfo->inputLatency );
    printf("Stream info: outputLatency = %g\n", streamInfo->outputLatency );

    err = Pa_StartStream( stream );
    if( err != paNoError ) goto error2;

    printf("Play for %d seconds.\n", NUM_SECONDS );
    Pa_Sleep( NUM_SECONDS * 1000 );
    
    printf("  minFramesPerBuffer = %4d\n", dataPtr->minFramesPerBuffer );
    printf("  maxFramesPerBuffer = %4d\n", dataPtr->maxFramesPerBuffer );
    printf("  minDeltaDacTime = %f\n", dataPtr->minDeltaDacTime );
    printf("  maxDeltaDacTime = %f\n", dataPtr->maxDeltaDacTime );

    err = Pa_StopStream( stream );
    if( err != paNoError ) goto error2;

    err = Pa_CloseStream( stream );
    Pa_Sleep( 1 * 1000 );

    
    printf("-------------------------------------\n");
    return err;
error2:
    Pa_CloseStream( stream );
error1:
    printf("-------------------------------------\n");
    return err;
}

int main(int argc, char *argv[])
{
//    system("./soxclient '80/C#5 40/C6'");

    if (argc < 3) {
        displayOption();
        exit(0);
    }

    loadMidiHzTxt();

    int InDeviceId = atoi(argv[1]);
    int OutDeviceId = atoi(argv[2]);

    const int SamplingRate = 44100;
    const int BufLength = SamplingRate / 50;

    // FFT用に2のべき乗を計算する
    for (double i = 1.0; i < 1000; i = i + 1.0) {
        fft_num = pow(2.0, i);
        if (fft_num > BufLength * 2) {
            break;
        }
    }

    Pa_Initialize();

    PaStreamParameters in_param;
    in_param.channelCount = 2;
    in_param.device = InDeviceId;
    in_param.hostApiSpecificStreamInfo = NULL;
    in_param.sampleFormat = paInt16;    
    in_param.suggestedLatency = Pa_GetDeviceInfo(in_param.device)->defaultLowInputLatency;

    PaStreamParameters out_param;
    out_param.channelCount = 1;
    out_param.device = OutDeviceId;
    out_param.hostApiSpecificStreamInfo = NULL;
    out_param.sampleFormat = paInt16;
    out_param.suggestedLatency = Pa_GetDeviceInfo(out_param.device)->defaultLowInputLatency;

    PaStream *Stream;
    Pa_OpenStream(&Stream, &in_param, &out_param, SamplingRate, BufLength, NULL, CallBack, NULL);
    const PaStreamInfo *info = Pa_GetStreamInfo(Stream);

    fprintf(stderr, "----------Start----------\n");
    Pa_StartStream(Stream);

    getchar();
    Pa_CloseStream(Stream);
    Pa_Terminate();

    fftw_destroy_plan(p);
    fftw_free(fft_in); 
    fftw_free(fft_out);

    (void) pclose(file_p);

}

int start_portaudio(int *nominal_sample_rate, double *real_sample_rate)
{
	PaStream *stream;

	if(pthread_mutex_init(&audio_mutex,NULL)) {
		error("Failed to setup audio mutex");
		return 1;
	}

	PaError err = Pa_Initialize();
	if(err!=paNoError)
		goto error;

#ifdef DEBUG
	if(testing) {
		*nominal_sample_rate = PA_SAMPLE_RATE;
		*real_sample_rate = PA_SAMPLE_RATE;
		goto end;
	}
#endif

	PaDeviceIndex default_input = Pa_GetDefaultInputDevice();
	if(default_input == paNoDevice) {
		error("No default audio input device found");
		return 1;
	}
	long channels = Pa_GetDeviceInfo(default_input)->maxInputChannels;
	if(channels == 0) {
		error("Default audio device has no input channels");
		return 1;
	}
	if(channels > 2) channels = 2;
	err = Pa_OpenDefaultStream(&stream,channels,0,paFloat32,PA_SAMPLE_RATE,paFramesPerBufferUnspecified,paudio_callback,(void*)channels);
	if(err!=paNoError)
		goto error;

	err = Pa_StartStream(stream);
	if(err!=paNoError)
		goto error;

	const PaStreamInfo *info = Pa_GetStreamInfo(stream);
#ifdef LIGHT
	*nominal_sample_rate = PA_SAMPLE_RATE / 2;
	*real_sample_rate = info->sampleRate / 2;
#else
	*nominal_sample_rate = PA_SAMPLE_RATE;
	*real_sample_rate = info->sampleRate;
#endif
#ifdef DEBUG
end:
#endif
	debug("sample rate: nominal = %d real = %f\n",*nominal_sample_rate,*real_sample_rate);

	return 0;

error:
	error("Error opening audio input: %s", Pa_GetErrorText(err));
	return 1;
}

bool Portaudio::init()
      {
      PaError err = Pa_Initialize();
      if (err != paNoError) {
            qDebug("Portaudio initialize failed: %s", Pa_GetErrorText(err));
            return false;
            }
      initialized = true;
      if (MScore::debugMode)
            qDebug("using PortAudio Version: %s", Pa_GetVersionText());

      PaDeviceIndex idx = preferences.portaudioDevice;
      if (idx < 0)
            idx = Pa_GetDefaultOutputDevice();

      const PaDeviceInfo* di = Pa_GetDeviceInfo(idx);
      _sampleRate = int(di->defaultSampleRate);

      /* Open an audio I/O stream. */
      struct PaStreamParameters out;
      memset(&out, 0, sizeof(out));

      out.device           = idx;
      out.channelCount     = 2;
      out.sampleFormat     = paFloat32;
      out.suggestedLatency = 0.020;
      out.hostApiSpecificStreamInfo = 0;

      err = Pa_OpenStream(&stream, 0, &out, double(_sampleRate), 0, 0, paCallback, (void*)this);
      if (err != paNoError) {
            // fall back to default device:
            out.device = Pa_GetDefaultOutputDevice();
            err = Pa_OpenStream(&stream, 0, &out, double(_sampleRate), 0, 0, paCallback, (void*)this);
            if (err != paNoError) {
                  qDebug("Portaudio open stream %d failed: %s", idx, Pa_GetErrorText(err));
                  return false;
                  }
            }
      const PaStreamInfo* si = Pa_GetStreamInfo(stream);
      if (si)
            _sampleRate = int(si->sampleRate);
#ifdef USE_ALSA
      midiDriver = new AlsaMidiDriver(seq);
#endif
#ifdef USE_PORTMIDI
      midiDriver = new PortMidiDriver(seq);
#endif
      if (midiDriver && !midiDriver->init()) {
            qDebug("Init midi driver failed");
            delete midiDriver;
            midiDriver = 0;
#ifdef USE_PORTMIDI
            return true;                  // return OK for audio driver; midi is only input
#else
            return false;
#endif
            }
      return true;
      }

 void report_latency()
 {
     const PaStreamInfo *psi = Pa_GetStreamInfo(stream);
     if (psi){
         fprintf(stdout,"  Sample rate: %.3f\n", psi->sampleRate);
         fprintf(stdout,"  Latency (in/out): %.3f / %.3f sec\n", psi->inputLatency, psi->outputLatency); 
     }
 }

/* Returns true on success, false on failure */
bool PortAudioStreamer::Start(const PaStreamParameters *inputParams,
                              const PaStreamParameters *outputParams,
                              double sampleRate)
{
  PaError error;

  qDebug("Trying Pa_OpenStream() with sampleRate %g inputLatency %g outputLatency %g innch %d outnch %d",
         sampleRate,
         inputParams->suggestedLatency,
         outputParams->suggestedLatency,
         inputParams->channelCount,
         outputParams->channelCount);
  const PaDeviceInfo *deviceInfo = Pa_GetDeviceInfo(inputParams->device);
  if (deviceInfo) {
    const PaHostApiInfo *hostApiInfo = Pa_GetHostApiInfo(deviceInfo->hostApi);
    qDebug("Input device: %s (%s)", deviceInfo->name,
           hostApiInfo ? hostApiInfo->name : "<invalid host api>");
  }
  deviceInfo = Pa_GetDeviceInfo(outputParams->device);
  if (deviceInfo) {
    const PaHostApiInfo *hostApiInfo = Pa_GetHostApiInfo(deviceInfo->hostApi);
    qDebug("Output device: %s (%s)", deviceInfo->name,
           hostApiInfo ? hostApiInfo->name : "<invalid host api>");
  }

  error = Pa_OpenStream(&stream, inputParams, outputParams,
                        sampleRate, paFramesPerBufferUnspecified,
                        paPrimeOutputBuffersUsingStreamCallback,
                        streamCallbackTrampoline, this);
  if (error != paNoError) {
    logPortAudioError("Pa_OpenStream() failed", error);
    stream = NULL;
    return false;
  }

  m_srate = sampleRate;
  m_innch = inputParams->channelCount;
  m_outnch = outputParams->channelCount;
  m_bps = 32;

  error = Pa_StartStream(stream);
  if (error != paNoError) {
    logPortAudioError("Pa_StartStream() failed", error);
    Pa_CloseStream(stream);
    stream = NULL;
    return false;
  }

  const PaStreamInfo *streamInfo = Pa_GetStreamInfo(stream);
  if (streamInfo) {
    qDebug("Stream started with sampleRate %g inputLatency %g outputLatency %g",
           streamInfo->sampleRate,
           streamInfo->inputLatency,
           streamInfo->outputLatency);
  }

  return true;
}

int PortAudioStreamer::streamCallback(const void *input, void *output,
    unsigned long frameCount, const PaStreamCallbackTimeInfo *timeInfo,
    PaStreamCallbackFlags statusFlags)
{
  float **inbuf = (float**)input; // const-cast due to SPLPROC prototype
  float **outbuf = static_cast<float**>(output);
  const PaStreamInfo *info = Pa_GetStreamInfo(stream);

  splproc(inbuf, m_innch, outbuf, m_outnch, frameCount, info->sampleRate);
  return paContinue;
}

portaudio_decoder *quiet_portaudio_decoder_create(const decoder_options *opt, PaDeviceIndex device, PaTime latency, double sample_rate, size_t sample_buffer_size) {
    PaStream *stream;
    PaStreamParameters param = {
        .device = device,
        .channelCount = 2,
        .sampleFormat = paFloat32,
        .suggestedLatency = latency,
        .hostApiSpecificStreamInfo = NULL,
    };
    PaError err = Pa_OpenStream(&stream, &param, NULL, sample_rate,
                        sample_buffer_size, paNoFlag, NULL, NULL);
    if (err != paNoError) {
        printf("failed to open port audio stream, %s\n", Pa_GetErrorText(err));
        return NULL;
    }

    err = Pa_StartStream(stream);
    if (err != paNoError) {
        printf("failed to start port audio stream, %s\n", Pa_GetErrorText(err));
        return NULL;
    }

    const PaStreamInfo *info = Pa_GetStreamInfo(stream);
    decoder *d = quiet_decoder_create(opt, info->sampleRate);

    quiet_sample_t *sample_buffer = malloc(2 * sample_buffer_size * sizeof(quiet_sample_t));
    quiet_sample_t *mono_buffer = malloc(sample_buffer_size * sizeof(quiet_sample_t));
    portaudio_decoder *decoder = malloc(1 * sizeof(portaudio_decoder));
    decoder->dec = d;
    decoder->stream = stream;
    decoder->sample_buffer = sample_buffer;
    decoder->mono_buffer = mono_buffer;
    decoder->sample_buffer_size = sample_buffer_size;

    return decoder;
}

ssize_t quiet_portaudio_decoder_recv(quiet_portaudio_decoder *d, uint8_t *data, size_t len) {
    return quiet_decoder_recv(d->dec, data, len);
}

void quiet_portaudio_decoder_consume(quiet_portaudio_decoder *d) {
    PaError err = Pa_ReadStream(d->stream, d->sample_buffer, d->sample_buffer_size);
    if (err != paNoError) {
        printf("failed to read port audio stream, %s\n", Pa_GetErrorText(err));
        return;
    }
    for (size_t i = 0; i < d->sample_buffer_size; i++) {
        d->mono_buffer[i] = d->sample_buffer[i * 2] + d->sample_buffer[i * 2 + 1];
    }
    quiet_decoder_consume(d->dec, d->mono_buffer, d->sample_buffer_size);
}

/* API: Get stream parameters */
static pj_status_t strm_get_param(pjmedia_aud_stream *s,
				  pjmedia_aud_param *pi)
{
    struct pa_aud_stream *strm = (struct pa_aud_stream*)s;
    const PaStreamInfo *paPlaySI = NULL, *paRecSI = NULL;

    PJ_ASSERT_RETURN(strm && pi, PJ_EINVAL);
    PJ_ASSERT_RETURN(strm->play_strm || strm->rec_strm, PJ_EINVALIDOP);

    if (strm->play_strm) {
	paPlaySI = Pa_GetStreamInfo(strm->play_strm);
    }
    if (strm->rec_strm) {
	paRecSI = Pa_GetStreamInfo(strm->rec_strm);
    }

    pj_bzero(pi, sizeof(*pi));
    pi->dir = strm->dir;
    pi->play_id = strm->play_id;
    pi->rec_id = strm->rec_id;
    pi->clock_rate = (unsigned)(paPlaySI ? paPlaySI->sampleRate : 
				paRecSI->sampleRate);
    pi->channel_count = strm->channel_count;
    pi->samples_per_frame = strm->samples_per_frame;
    pi->bits_per_sample = strm->bytes_per_sample * 8;
    if (paRecSI) {
	pi->flags |= PJMEDIA_AUD_DEV_CAP_INPUT_LATENCY;
	pi->input_latency_ms = (unsigned)(paRecSI ? paRecSI->inputLatency * 
						    1000 : 0);
    }
    if (paPlaySI) {
	pi->flags |= PJMEDIA_AUD_DEV_CAP_OUTPUT_LATENCY;
	pi->output_latency_ms = (unsigned)(paPlaySI? paPlaySI->outputLatency * 
						     1000 : 0);
    }

    return PJ_SUCCESS;
}