static void *dev_thread(void *arg) { int ret, frames, i, j, shift, bits, isfloat; int sample_bytes; uint32_t (*puller)(unsigned char **, int); S32 sample; double scale; snd_pcm_format_t format; int avail; //float *fpt, *fbuf; float fsample; unsigned char *buffer, *pt; buffer = (unsigned char *)malloc(blocksize * CHANNELS * sizeof(float)); //fbuf = (float *)malloc(blocksize * CHANNELS); snd_pcm_prepare(handle); bits = snd_pcm_hw_params_get_sbits(hparams); sample_bytes = bits / 8; snd_pcm_hw_params_get_format(hparams, &format); if ((isfloat = snd_pcm_format_float(format))) scale = 1.0; else scale = pow(2.0 , 1 - bits); logmsg("1/scale %f [%d]\n", 1.0 / scale, bits); running = 1; if (snd_pcm_format_big_endian(format) == 1) puller = bepull; else puller = lepull; shift = 8 * (sizeof(uint32_t) - sample_bytes); ret = snd_pcm_readi(handle, buffer, blocksize); // prime pump if (scount > 0) sfile = fopen("/tmp/sample.raw", "w"); while (running) { if ((ret = snd_pcm_wait(handle, 1000)) < 0) { if (ret == -EPIPE) logmsg("wait: xrun\n"); else if (ret == -ESTRPIPE) logmsg("wait: suspend\n"); else logmsg("poll failed %s\n", strerror(errno)); continue; } avail = snd_pcm_avail_update(handle); if (avail < 0) { if (avail == -EPIPE) logmsg("an xrun occurred\n"); else logmsg("weird avail %d\n", avail); break; } if (avail > blocksize) avail = blocksize; frames = snd_pcm_readi(handle, (void *)buffer, avail); if (frames < 0) { logmsg("read failed %s\n", snd_strerror(frames)); } else if (frames != avail) { logmsg("wanted %d got %d\n", avail, frames); } pt = buffer; //fpt = fbuf; for (i = 0; i < frames; i++) { for (j = 0; j < CHANNELS; j++) { sample.u = (*puller)(&pt, sample_bytes); if (isfloat) fsample = sample.f; else { if (shift) sample.s = (sample.s << shift) >> shift; fsample = sample.s * scale; } if (scount > 0) { scount--; fprintf(sfile, "%10d, %1.8f\n", sample.s, fsample); if (scount == 0) fclose(sfile); } push_ringbuf(rbuf, fsample); } } } free(buffer); //free(fbuf); snd_pcm_drain(handle); snd_pcm_close(handle); handle = NULL; return NULL; }
bool open() { // Open the Alsa playback device. int err=-1,count=0; unsigned int freakuency = frequency; while((count < 5) && (err < 0)) { err = snd_pcm_open ( &handle, ALSA_OUTPUT_NAME, SND_PCM_STREAM_PLAYBACK, 0 ); if(err < 0) { count++; qWarning()<<"QAudioOutput::open() err="<<err<<", count="<<count; } } if (( err < 0)||(handle == 0)) { qWarning( "QAudioOuput: snd_pcm_open: error %d", err ); return false; } snd_pcm_nonblock( handle, 0 ); // Set the desired HW parameters. snd_pcm_hw_params_t *hwparams; snd_pcm_hw_params_alloca( &hwparams ); err = snd_pcm_hw_params_any( handle, hwparams ); if ( err < 0 ) { qWarning( "QAudioOutput: snd_pcm_hw_params_any: err %d", err); return false; } err = snd_pcm_hw_params_set_access( handle, hwparams, access ); if ( err < 0 ) { qWarning( "QAudioOutput: snd_pcm_hw_params_set_access: err %d", err); return false; } err = snd_pcm_hw_params_set_format( handle, hwparams, ( bitsPerSample == 16 ? SND_PCM_FORMAT_S16 : SND_PCM_FORMAT_U8 ) ); if ( err < 0 ) { qWarning( "QAudioOutput: snd_pcm_hw_params_set_format: err %d", err); return false; } err = snd_pcm_hw_params_set_channels ( handle, hwparams, (unsigned int)channels ); if ( err < 0 ) { qWarning( "QAudioOutput: snd_pcm_hw_params_set_channels: err %d", err); return false; } err = snd_pcm_hw_params_set_rate_near ( handle, hwparams, &freakuency, 0 ); if ( err < 0 ) { qWarning( "QAudioOutput: snd_pcm_hw_params_set_rate_near: err %d", err); return false; } #ifndef ALSA_BUFFER_SIZE err = snd_pcm_hw_params_set_buffer_time_near(handle, hwparams, &buffer_time, 0); if ( err < 0 ) { qWarning( "QAudioOutput: snd_pcm_hw_params_set_buffer_time_near: err %d",err); } err = snd_pcm_hw_params_get_buffer_size(hwparams, &buffer_size); if ( err < 0 ) { qWarning( "QAudioOutput: snd_pcm_hw_params_get_buffer_size: err %d",err); } #else buffer_size = ALSA_BUFFER_SIZE; err = snd_pcm_hw_params_set_buffer_size_near(handle, hwparams, &buffer_size); if ( err < 0 ) { qWarning( "QAudioOutput: snd_pcm_hw_params_set_buffer_time_near: err %d",err); } #endif #ifndef ALSA_PERIOD_SIZE period_time = buffer_time/4; err = snd_pcm_hw_params_set_period_time_near(handle, hwparams, &period_time, 0); if ( err < 0 ) { qWarning( "QAudioOutput: snd_pcm_hw_params_set_period_time_near: err %d",err); } #else period_size = ALSA_PERIOD_SIZE; err = snd_pcm_hw_params_set_period_size_near(handle, hwparams, &period_size, 0); if ( err < 0 ) { qWarning( "QAudioOutput: snd_pcm_hw_params_set_period_size_near: err %d",err); } #endif err = snd_pcm_hw_params(handle, hwparams); if ( err < 0 ) { qWarning( "QAudioOutput: snd_pcm_hw_params: err %d", err); return false; } int dir; unsigned int vval, vval2; snd_pcm_access_t val; snd_pcm_format_t fval; snd_pcm_subformat_t sval; qLog(QAudioOutput) << "PCM handle name =" << snd_pcm_name(handle); qLog(QAudioOutput) << "PCM state =" << snd_pcm_state_name(snd_pcm_state(handle)); snd_pcm_hw_params_get_access(hwparams,&val); vval = (unsigned int)val; if ( (int)vval != (int)access ) { qWarning( "QAudioInput: access type not set, want %s got %s", snd_pcm_access_name((snd_pcm_access_t)access), snd_pcm_access_name((snd_pcm_access_t)vval) ); access = (snd_pcm_access_t)vval; } qLog(QAudioOutput) << "access type =" << snd_pcm_access_name((snd_pcm_access_t)vval); snd_pcm_hw_params_get_format(hwparams, &fval); vval = (unsigned int)fval; if ( (int)vval != (int)format ) { qWarning( "QAudioInput: format type not set, want %s got %s", snd_pcm_format_name((snd_pcm_format_t)format), snd_pcm_format_name((snd_pcm_format_t)vval) ); format = (snd_pcm_format_t)vval; } qLog(QAudioOutput) << QString("format = '%1' (%2)").arg(snd_pcm_format_name((snd_pcm_format_t)vval)) .arg(snd_pcm_format_description((snd_pcm_format_t)vval)) .toLatin1().constData(); snd_pcm_hw_params_get_subformat(hwparams,&sval); vval = (unsigned int)sval; qLog(QAudioOutput) << QString("subformat = '%1' (%2)").arg(snd_pcm_subformat_name((snd_pcm_subformat_t)vval)) .arg(snd_pcm_subformat_description((snd_pcm_subformat_t)vval)) .toLatin1().constData(); snd_pcm_hw_params_get_channels(hwparams, &vval); if ( (int)vval != (int)channels ) { qWarning( "QAudioInput: channels type not set, want %d got %d",channels,vval); channels = vval; } qLog(QAudioOutput) << "channels =" << vval; snd_pcm_hw_params_get_rate(hwparams, &vval, &dir); if ( (int)vval != (int)frequency ) { qWarning( "QAudioInput: frequency type not set, want %d got %d",frequency,vval); frequency = vval; } qLog(QAudioOutput) << "rate =" << vval << "bps"; snd_pcm_hw_params_get_period_time(hwparams,&period_time, &dir); qLog(QAudioOutput) << "period time =" << period_time << "us"; snd_pcm_hw_params_get_period_size(hwparams,&period_size, &dir); qLog(QAudioOutput) << "period size =" << (int)period_size << "frames"; qLog(QAudioOutput) << "buffer time =" << (int)buffer_time << "us"; qLog(QAudioOutput) << "buffer size =" << (int)buffer_size << "frames"; snd_pcm_hw_params_get_periods(hwparams, &vval, &dir); periods = vval; qLog(QAudioOutput) << "periods per buffer =" << vval << "frames"; snd_pcm_hw_params_get_rate_numden(hwparams, &vval, &vval2); qLog(QAudioOutput) << QString("exact rate = %1/%2 bps").arg(vval).arg(vval2).toLatin1().constData(); vval = snd_pcm_hw_params_get_sbits(hwparams); qLog(QAudioOutput) << "significant bits =" << vval; vval = snd_pcm_hw_params_is_batch(hwparams); qLog(QAudioOutput) << "is batch =" << vval; vval = snd_pcm_hw_params_is_block_transfer(hwparams); qLog(QAudioOutput) << "is block transfer =" << vval; vval = snd_pcm_hw_params_is_double(hwparams); qLog(QAudioOutput) << "is double =" << vval; vval = snd_pcm_hw_params_is_half_duplex(hwparams); qLog(QAudioOutput) << "is half duplex =" << vval; vval = snd_pcm_hw_params_is_joint_duplex(hwparams); qLog(QAudioOutput) << "is joint duplex =" << vval; vval = snd_pcm_hw_params_can_overrange(hwparams); qLog(QAudioOutput) << "can overrange =" << vval; vval = snd_pcm_hw_params_can_mmap_sample_resolution(hwparams); qLog(QAudioOutput) << "can mmap =" << vval; vval = snd_pcm_hw_params_can_pause(hwparams); qLog(QAudioOutput) << "can pause =" << vval; vval = snd_pcm_hw_params_can_resume(hwparams); qLog(QAudioOutput) << "can resume =" << vval; vval = snd_pcm_hw_params_can_sync_start(hwparams); qLog(QAudioOutput) << "can sync start =" << vval; // Set the desired SW parameters. snd_pcm_sw_params_t *swparams; snd_pcm_sw_params_alloca(&swparams); err = snd_pcm_sw_params_current(handle, swparams); if ( err < 0 ) { qWarning( "QAudioOutput: snd_pcm_sw_params_current: err %d",err); } err = snd_pcm_sw_params_set_start_threshold(handle,swparams,buffer_size); if ( err < 0 ) { qWarning( "QAudioOutput: snd_pcm_sw_params_set_start_threshold: err %d",err); } err = snd_pcm_sw_params_set_stop_threshold(handle,swparams,buffer_size); if ( err < 0 ) { qWarning( "QAudioOutput: snd_pcm_sw_params_set_stop_threshold: err %d",err); } err = snd_pcm_sw_params_set_avail_min(handle, swparams,period_size); if ( err < 0 ) { qWarning( "QAudioOutput: snd_pcm_sw_params_set_avail_min: err %d",err); } err = snd_pcm_sw_params(handle, swparams); if ( err < 0 ) { qWarning( "QAudioOutput: snd_pcm_sw_params: err %d",err); } // Prepare for audio output. snd_pcm_prepare( handle ); return true; }
bool CAESinkALSA::InitializeHW(AEAudioFormat &format) { snd_pcm_hw_params_t *hw_params; snd_pcm_hw_params_alloca(&hw_params); memset(hw_params, 0, snd_pcm_hw_params_sizeof()); snd_pcm_hw_params_any(m_pcm, hw_params); snd_pcm_hw_params_set_access(m_pcm, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED); unsigned int sampleRate = format.m_sampleRate; unsigned int channelCount = format.m_channelLayout.Count(); snd_pcm_hw_params_set_rate_near (m_pcm, hw_params, &sampleRate, NULL); snd_pcm_hw_params_set_channels_near(m_pcm, hw_params, &channelCount); /* ensure we opened X channels or more */ if (format.m_channelLayout.Count() > channelCount) { CLog::Log(LOGINFO, "CAESinkALSA::InitializeHW - Unable to open the required number of channels"); } /* update the channelLayout to what we managed to open */ format.m_channelLayout.Reset(); for (unsigned int i = 0; i < channelCount; ++i) format.m_channelLayout += ALSAChannelMap[i]; snd_pcm_format_t fmt = AEFormatToALSAFormat(format.m_dataFormat); if (fmt == SND_PCM_FORMAT_UNKNOWN) { /* if we dont support the requested format, fallback to float */ format.m_dataFormat = AE_FMT_FLOAT; fmt = SND_PCM_FORMAT_FLOAT; } /* try the data format */ if (snd_pcm_hw_params_set_format(m_pcm, hw_params, fmt) < 0) { /* if the chosen format is not supported, try each one in decending order */ CLog::Log(LOGINFO, "CAESinkALSA::InitializeHW - Your hardware does not support %s, trying other formats", CAEUtil::DataFormatToStr(format.m_dataFormat)); for (enum AEDataFormat i = AE_FMT_MAX; i > AE_FMT_INVALID; i = (enum AEDataFormat)((int)i - 1)) { if (AE_IS_RAW(i) || i == AE_FMT_MAX) continue; if (m_passthrough && i != AE_FMT_S16BE && i != AE_FMT_S16LE) continue; fmt = AEFormatToALSAFormat(i); if (fmt == SND_PCM_FORMAT_UNKNOWN || snd_pcm_hw_params_set_format(m_pcm, hw_params, fmt) < 0) { fmt = SND_PCM_FORMAT_UNKNOWN; continue; } int fmtBits = CAEUtil::DataFormatToBits(i); int bits = snd_pcm_hw_params_get_sbits(hw_params); if (bits != fmtBits) { /* if we opened in 32bit and only have 24bits, pack into 24 */ if (fmtBits == 32 && bits == 24) i = AE_FMT_S24NE4; else continue; } /* record that the format fell back to X */ format.m_dataFormat = i; CLog::Log(LOGINFO, "CAESinkALSA::InitializeHW - Using data format %s", CAEUtil::DataFormatToStr(format.m_dataFormat)); break; } /* if we failed to find a valid output format */ if (fmt == SND_PCM_FORMAT_UNKNOWN) { CLog::Log(LOGERROR, "CAESinkALSA::InitializeHW - Unable to find a suitable output format"); return false; } } snd_pcm_uframes_t periodSize, bufferSize; snd_pcm_hw_params_get_buffer_size_max(hw_params, &bufferSize); snd_pcm_hw_params_get_period_size_max(hw_params, &periodSize, NULL); /* We want to make sure, that we have max 200 ms Buffer with a periodSize of approx 50 ms. Choosing a higher bufferSize will cause problems with menu sounds. Buffer will be increased after those are fixed. */ periodSize = std::min(periodSize, (snd_pcm_uframes_t) sampleRate / 20); bufferSize = std::min(bufferSize, (snd_pcm_uframes_t) sampleRate / 5); /* According to upstream we should set buffer size first - so make sure it is always at least 4x period size to not get underruns (some systems seem to have issues with only 2 periods) */ periodSize = std::min(periodSize, bufferSize / 4); CLog::Log(LOGDEBUG, "CAESinkALSA::InitializeHW - Request: periodSize %lu, bufferSize %lu", periodSize, bufferSize); snd_pcm_hw_params_t *hw_params_copy; snd_pcm_hw_params_alloca(&hw_params_copy); snd_pcm_hw_params_copy(hw_params_copy, hw_params); // copy what we have and is already working // Make sure to not initialize too large to not cause underruns snd_pcm_uframes_t periodSizeMax = bufferSize / 3; if(snd_pcm_hw_params_set_period_size_max(m_pcm, hw_params_copy, &periodSizeMax, NULL) != 0) { snd_pcm_hw_params_copy(hw_params_copy, hw_params); // restore working copy CLog::Log(LOGDEBUG, "CAESinkALSA::InitializeHW - Request: Failed to limit periodSize to %lu", periodSizeMax); } // first trying bufferSize, PeriodSize // for more info see here: // http://mailman.alsa-project.org/pipermail/alsa-devel/2009-September/021069.html // the last three tries are done as within pulseaudio // backup periodSize and bufferSize first. Restore them after every failed try snd_pcm_uframes_t periodSizeTemp, bufferSizeTemp; periodSizeTemp = periodSize; bufferSizeTemp = bufferSize; if (snd_pcm_hw_params_set_buffer_size_near(m_pcm, hw_params_copy, &bufferSize) != 0 || snd_pcm_hw_params_set_period_size_near(m_pcm, hw_params_copy, &periodSize, NULL) != 0 || snd_pcm_hw_params(m_pcm, hw_params_copy) != 0) { bufferSize = bufferSizeTemp; periodSize = periodSizeTemp; // retry with PeriodSize, bufferSize snd_pcm_hw_params_copy(hw_params_copy, hw_params); // restore working copy if (snd_pcm_hw_params_set_period_size_near(m_pcm, hw_params_copy, &periodSize, NULL) != 0 || snd_pcm_hw_params_set_buffer_size_near(m_pcm, hw_params_copy, &bufferSize) != 0 || snd_pcm_hw_params(m_pcm, hw_params_copy) != 0) { // try only periodSize periodSize = periodSizeTemp; snd_pcm_hw_params_copy(hw_params_copy, hw_params); // restore working copy if(snd_pcm_hw_params_set_period_size_near(m_pcm, hw_params_copy, &periodSize, NULL) != 0 || snd_pcm_hw_params(m_pcm, hw_params_copy) != 0) { // try only BufferSize bufferSize = bufferSizeTemp; snd_pcm_hw_params_copy(hw_params_copy, hw_params); // restory working copy if (snd_pcm_hw_params_set_buffer_size_near(m_pcm, hw_params_copy, &bufferSize) != 0 || snd_pcm_hw_params(m_pcm, hw_params_copy) != 0) { // set default that Alsa would choose CLog::Log(LOGWARNING, "CAESinkAlsa::IntializeHW - Using default alsa values - set failed"); if (snd_pcm_hw_params(m_pcm, hw_params) != 0) { CLog::Log(LOGDEBUG, "CAESinkALSA::InitializeHW - Could not init a valid sink"); return false; } } } // reread values when alsa default was kept snd_pcm_get_params(m_pcm, &bufferSize, &periodSize); } } CLog::Log(LOGDEBUG, "CAESinkALSA::InitializeHW - Got: periodSize %lu, bufferSize %lu", periodSize, bufferSize); /* set the format parameters */ format.m_sampleRate = sampleRate; format.m_frames = periodSize; format.m_frameSamples = periodSize * format.m_channelLayout.Count(); format.m_frameSize = snd_pcm_frames_to_bytes(m_pcm, 1); m_bufferSize = (unsigned int)bufferSize; m_timeout = std::ceil((double)(bufferSize * 1000) / (double)sampleRate); CLog::Log(LOGDEBUG, "CAESinkALSA::InitializeHW - Setting timeout to %d ms", m_timeout); return true; }
int main( int argc, char *argv[] ) { struct structArgs cmdArgs; unsigned int val, val2; int dir; int errNum; cmdArgs.card = 0; // Default card. cmdArgs.control = 1; // Default control. // ************************************************************************ // ALSA control elements. // ************************************************************************ snd_pcm_t *pcmp; snd_pcm_hw_params_t *params; // snd_pcm_stream_t stream = SND_PCM_STREAM_PLAYBACK; snd_pcm_stream_t stream = SND_PCM_STREAM_CAPTURE; snd_pcm_uframes_t frames; // ************************************************************************ // Get command line parameters. // ************************************************************************ argp_parse( &argp, argc, argv, 0, 0, &cmdArgs ); printf( "Card = %i\n", cmdArgs.card ); printf( "Control = %i\n", cmdArgs.control ); sprintf( cmdArgs.deviceID, "hw:%i,%i", cmdArgs.card, cmdArgs.control ); printf( "Using device %s :", cmdArgs.deviceID ); /* Allocate a hardware parameters object. */ if ( snd_pcm_hw_params_alloca( ¶ms ) < 0 ) { fprintf( stderr, "Unable to allocate.\n" ); return -1; } /* Open PCM device for playback. */ // if ( snd_pcm_open( &pcmp, cmdArgs.deviceID, stream, 0 ) < 0 ) // { // fprintf( stderr, "Unable to open pcm device.\n" ); // return -1; // } /* Fill it in with default values. */ // if ( snd_pcm_hw_params_any( pcmp, params ) < 0 // { // fprintf( stderr, "Unable to set default values.\n" ); // return -1; // } /* Interleaved mode */ // snd_pcm_hw_params_set_access( pcmp, params, // SND_PCM_ACCESS_RW_INTERLEAVED ); /* Signed 16-bit little-endian format */ snd_pcm_hw_params_set_format( pcmp, params, SND_PCM_FORMAT_S16_LE ); /* Two channels (stereo) */ snd_pcm_hw_params_set_channels( pcmp, params, 2 ); /* 44100 bits/second sampling rate (CD quality) */ val = 44100; snd_pcm_hw_params_set_rate_near( pcmp, params, &val, &dir ); /* Write the parameters to the driver */ errNum = snd_pcm_hw_params( pcmp, params ); if ( errNum < 0 ) { fprintf(stderr, "unable to set hw parameters: %s\n", snd_strerror( errNum )); exit( 1 ); } /* Display information about the PCM interface */ printf( "PCM handle name = '%s'\n", snd_pcm_name( pcmp )); printf("PCM state = %s\n", snd_pcm_state_name( snd_pcm_state( pcmp ))); snd_pcm_hw_params_get_access( params, ( snd_pcm_access_t * ) &val ); printf( "access type = %s\n", snd_pcm_access_name(( snd_pcm_access_t ) val )); snd_pcm_hw_params_get_format( params, ( snd_pcm_format_t * ) &val ); printf( "format = '%s' (%s)\n", snd_pcm_format_name(( snd_pcm_format_t ) val ), snd_pcm_format_description(( snd_pcm_format_t ) val )); snd_pcm_hw_params_get_subformat( params, ( snd_pcm_subformat_t * ) &val ); printf( "subformat = '%s' (%s)\n", snd_pcm_subformat_name(( snd_pcm_subformat_t ) val ), snd_pcm_subformat_description(( snd_pcm_subformat_t ) val )); snd_pcm_hw_params_get_channels( params, &val ); printf( "channels = %d\n", val ); snd_pcm_hw_params_get_rate( params, &val, &dir ); printf( "rate = %d bps\n", val ); snd_pcm_hw_params_get_period_time( params, &val, &dir ); printf( "period time = %d us\n", val ); snd_pcm_hw_params_get_period_size( params, &frames, &dir ); printf( "period size = %d frames\n", ( int ) frames ); snd_pcm_hw_params_get_buffer_time( params, &val, &dir ); printf( "buffer time = %d us\n", val ); snd_pcm_hw_params_get_buffer_size( params, ( snd_pcm_uframes_t * ) &val ); printf( "buffer size = %d frames\n", val ); snd_pcm_hw_params_get_periods( params, &val, &dir ); printf( "periods per buffer = %d frames\n", val ); snd_pcm_hw_params_get_rate_numden( params, &val, &val2 ); printf( "exact rate = %d/%d bps\n", val, val2 ); val = snd_pcm_hw_params_get_sbits( params ); printf( "significant bits = %d\n", val ); // snd_pcm_hw_params_get_tick_time( params, &val, &dir ); // printf( "tick time = %d us\n", val ); val = snd_pcm_hw_params_is_batch( params ); printf( "is batch = %d\n", val ); val = snd_pcm_hw_params_is_block_transfer( params ); printf( "is block transfer = %d\n", val ); val = snd_pcm_hw_params_is_double( params ); printf( "is double = %d\n", val ); val = snd_pcm_hw_params_is_half_duplex( params ); printf( "is half duplex = %d\n", val ); val = snd_pcm_hw_params_is_joint_duplex( params ); printf( "is joint duplex = %d\n", val ); val = snd_pcm_hw_params_can_overrange( params ); printf( "can overrange = %d\n", val ); val = snd_pcm_hw_params_can_mmap_sample_resolution( params ); printf( "can mmap = %d\n", val ); val = snd_pcm_hw_params_can_pause( params ); printf( "can pause = %d\n", val ); val = snd_pcm_hw_params_can_resume( params ); printf( "can resume = %d\n", val ); val = snd_pcm_hw_params_can_sync_start( params ); printf( "can sync start = %d\n", val ); snd_pcm_close( pcmp ); return 0; }
bool CAESinkALSA::InitializeHW(AEAudioFormat &format) { snd_pcm_hw_params_t *hw_params; snd_pcm_hw_params_alloca(&hw_params); memset(hw_params, 0, snd_pcm_hw_params_sizeof()); snd_pcm_hw_params_any(m_pcm, hw_params); snd_pcm_hw_params_set_access(m_pcm, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED); unsigned int sampleRate = format.m_sampleRate; unsigned int channelCount = format.m_channelLayout.Count(); snd_pcm_hw_params_set_rate_near (m_pcm, hw_params, &sampleRate, NULL); snd_pcm_hw_params_set_channels_near(m_pcm, hw_params, &channelCount); /* ensure we opened X channels or more */ if (format.m_channelLayout.Count() > channelCount) { CLog::Log(LOGERROR, "CAESinkALSA::InitializeHW - Unable to open the required number of channels"); return false; } /* update the channelLayout to what we managed to open */ format.m_channelLayout.Reset(); for (unsigned int i = 0; i < channelCount; ++i) format.m_channelLayout += ALSAChannelMap[i]; snd_pcm_format_t fmt = AEFormatToALSAFormat(format.m_dataFormat); if (fmt == SND_PCM_FORMAT_UNKNOWN) { /* if we dont support the requested format, fallback to float */ format.m_dataFormat = AE_FMT_FLOAT; fmt = SND_PCM_FORMAT_FLOAT; } /* try the data format */ if (snd_pcm_hw_params_set_format(m_pcm, hw_params, fmt) < 0) { /* if the chosen format is not supported, try each one in decending order */ CLog::Log(LOGINFO, "CAESinkALSA::InitializeHW - Your hardware does not support %s, trying other formats", CAEUtil::DataFormatToStr(format.m_dataFormat)); for (enum AEDataFormat i = AE_FMT_MAX; i > AE_FMT_INVALID; i = (enum AEDataFormat)((int)i - 1)) { if (AE_IS_RAW(i) || i == AE_FMT_MAX) continue; if (m_passthrough && i != AE_FMT_S16BE && i != AE_FMT_S16LE) continue; fmt = AEFormatToALSAFormat(i); if (fmt == SND_PCM_FORMAT_UNKNOWN || snd_pcm_hw_params_set_format(m_pcm, hw_params, fmt) < 0) { fmt = SND_PCM_FORMAT_UNKNOWN; continue; } int fmtBits = CAEUtil::DataFormatToBits(i); int bits = snd_pcm_hw_params_get_sbits(hw_params); if (bits != fmtBits) { /* if we opened in 32bit and only have 24bits, pack into 24 */ if (fmtBits == 32 && bits == 24) i = AE_FMT_S24NE4; else continue; } /* record that the format fell back to X */ format.m_dataFormat = i; CLog::Log(LOGINFO, "CAESinkALSA::InitializeHW - Using data format %s", CAEUtil::DataFormatToStr(format.m_dataFormat)); break; } /* if we failed to find a valid output format */ if (fmt == SND_PCM_FORMAT_UNKNOWN) { CLog::Log(LOGERROR, "CAESinkALSA::InitializeHW - Unable to find a suitable output format"); return false; } } unsigned int periods; snd_pcm_uframes_t periodSize, bufferSize; snd_pcm_hw_params_get_buffer_size_max(hw_params, &bufferSize); bufferSize = std::min(bufferSize, (snd_pcm_uframes_t)8192); periodSize = bufferSize / ALSA_PERIODS; periods = ALSA_PERIODS; CLog::Log(LOGDEBUG, "CAESinkALSA::InitializeHW - Request: periodSize %lu, periods %u, bufferSize %lu", periodSize, periods, bufferSize); /* work on a copy of the hw params */ snd_pcm_hw_params_t *hw_params_copy; snd_pcm_hw_params_alloca(&hw_params_copy); /* try to set the buffer size then the period size */ snd_pcm_hw_params_copy(hw_params_copy, hw_params); snd_pcm_hw_params_set_buffer_size_near(m_pcm, hw_params_copy, &bufferSize); snd_pcm_hw_params_set_period_size_near(m_pcm, hw_params_copy, &periodSize, NULL); snd_pcm_hw_params_set_periods_near (m_pcm, hw_params_copy, &periods , NULL); if (snd_pcm_hw_params(m_pcm, hw_params_copy) != 0) { /* try to set the period size then the buffer size */ snd_pcm_hw_params_copy(hw_params_copy, hw_params); snd_pcm_hw_params_set_period_size_near(m_pcm, hw_params_copy, &periodSize, NULL); snd_pcm_hw_params_set_buffer_size_near(m_pcm, hw_params_copy, &bufferSize); snd_pcm_hw_params_set_periods_near (m_pcm, hw_params_copy, &periods , NULL); if (snd_pcm_hw_params(m_pcm, hw_params_copy) != 0) { /* try to just set the buffer size */ snd_pcm_hw_params_copy(hw_params_copy, hw_params); snd_pcm_hw_params_set_buffer_size_near(m_pcm, hw_params_copy, &bufferSize); snd_pcm_hw_params_set_periods_near (m_pcm, hw_params_copy, &periods , NULL); if (snd_pcm_hw_params(m_pcm, hw_params_copy) != 0) { /* try to just set the period size */ snd_pcm_hw_params_copy(hw_params_copy, hw_params); snd_pcm_hw_params_set_period_size_near(m_pcm, hw_params_copy, &periodSize, NULL); snd_pcm_hw_params_set_periods_near (m_pcm, hw_params_copy, &periods , NULL); if (snd_pcm_hw_params(m_pcm, hw_params_copy) != 0) { CLog::Log(LOGERROR, "CAESinkALSA::InitializeHW - Failed to set the parameters"); return false; } } } } snd_pcm_hw_params_get_period_size(hw_params_copy, &periodSize, NULL); snd_pcm_hw_params_get_buffer_size(hw_params_copy, &bufferSize); CLog::Log(LOGDEBUG, "CAESinkALSA::InitializeHW - Got: periodSize %lu, periods %u, bufferSize %lu", periodSize, periods, bufferSize); /* set the format parameters */ format.m_sampleRate = sampleRate; format.m_frames = periodSize; format.m_frameSamples = periodSize * format.m_channelLayout.Count(); format.m_frameSize = snd_pcm_frames_to_bytes(m_pcm, 1); m_bufferSize = (unsigned int)bufferSize; m_timeout = std::ceil((double)(bufferSize * 1000) / (double)sampleRate); CLog::Log(LOGDEBUG, "CAESinkALSA::InitializeHW - Setting timeout to %d ms", m_timeout); return true; }
int main() { int rc; snd_pcm_t *handle; snd_pcm_hw_params_t *params; unsigned int val, val2; int dir; snd_pcm_uframes_t frames; /* Open PCM device for playback. */ rc = snd_pcm_open(&handle, "default", SND_PCM_STREAM_PLAYBACK, 0); if (rc < 0) { fprintf(stderr, "unable to open pcm device: %s\n", snd_strerror(rc)); exit(1); } /* Allocate a hardware parameters object. */ snd_pcm_hw_params_alloca(¶ms); /* Fill it in with default values. */ snd_pcm_hw_params_any(handle, params); /* Set the desired hardware parameters. */ /* Interleaved mode */ snd_pcm_hw_params_set_access(handle, params, SND_PCM_ACCESS_RW_INTERLEAVED); /* Signed 16-bit little-endian format */ snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_S16_LE); /* Two channels (stereo) */ snd_pcm_hw_params_set_channels(handle, params, 2); /* 44100 bits/second sampling rate (CD quality) */ val = 44100; snd_pcm_hw_params_set_rate_near(handle, params, &val, &dir); /* Write the parameters to the driver */ rc = snd_pcm_hw_params(handle, params); if (rc < 0) { fprintf(stderr, "unable to set hw parameters: %s\n", snd_strerror(rc)); exit(1); } /* Display information about the PCM interface */ printf("PCM handle name = '%s'\n", snd_pcm_name(handle)); printf("PCM state = %s\n", snd_pcm_state_name(snd_pcm_state(handle))); snd_pcm_hw_params_get_access(params, (snd_pcm_access_t *) &val); printf("access type = %s\n", snd_pcm_access_name((snd_pcm_access_t)val)); snd_pcm_hw_params_get_format(params, &val); printf("format = '%s' (%s)\n", snd_pcm_format_name((snd_pcm_format_t)val), snd_pcm_format_description( (snd_pcm_format_t)val)); snd_pcm_hw_params_get_subformat(params, (snd_pcm_subformat_t *)&val); printf("subformat = '%s' (%s)\n", snd_pcm_subformat_name((snd_pcm_subformat_t)val), snd_pcm_subformat_description( (snd_pcm_subformat_t)val)); snd_pcm_hw_params_get_channels(params, &val); printf("channels = %d\n", val); snd_pcm_hw_params_get_rate(params, &val, &dir); printf("rate = %d bps\n", val); snd_pcm_hw_params_get_period_time(params, &val, &dir); printf("period time = %d us\n", val); snd_pcm_hw_params_get_period_size(params, &frames, &dir); printf("period size = %d frames\n", (int)frames); snd_pcm_hw_params_get_buffer_time(params, &val, &dir); printf("buffer time = %d us\n", val); snd_pcm_hw_params_get_buffer_size(params, (snd_pcm_uframes_t *) &val); printf("buffer size = %d frames\n", val); snd_pcm_hw_params_get_periods(params, &val, &dir); printf("periods per buffer = %d frames\n", val); snd_pcm_hw_params_get_rate_numden(params, &val, &val2); printf("exact rate = %d/%d bps\n", val, val2); val = snd_pcm_hw_params_get_sbits(params); printf("significant bits = %d\n", val); snd_pcm_hw_params_get_tick_time(params, &val, &dir); printf("tick time = %d us\n", val); val = snd_pcm_hw_params_is_batch(params); printf("is batch = %d\n", val); val = snd_pcm_hw_params_is_block_transfer(params); printf("is block transfer = %d\n", val); val = snd_pcm_hw_params_is_double(params); printf("is double = %d\n", val); val = snd_pcm_hw_params_is_half_duplex(params); printf("is half duplex = %d\n", val); val = snd_pcm_hw_params_is_joint_duplex(params); printf("is joint duplex = %d\n", val); val = snd_pcm_hw_params_can_overrange(params); printf("can overrange = %d\n", val); val = snd_pcm_hw_params_can_mmap_sample_resolution(params); printf("can mmap = %d\n", val); val = snd_pcm_hw_params_can_pause(params); printf("can pause = %d\n", val); val = snd_pcm_hw_params_can_resume(params); printf("can resume = %d\n", val); val = snd_pcm_hw_params_can_sync_start(params); printf("can sync start = %d\n", val); snd_pcm_close(handle); return 0; }
int main() { int rc; snd_pcm_t* handle; snd_pcm_hw_params_t* params; unsigned int val; unsigned int val2; int dir; snd_pcm_uframes_t frames; if ( (rc = snd_pcm_open(&handle, "default", SND_PCM_STREAM_PLAYBACK, 0)) < 0) { std::cerr << "unable to open pcm devices: " << snd_strerror(rc) << std::endl; exit(1); } snd_pcm_hw_params_alloca(¶ms); snd_pcm_hw_params_any(handle, params); snd_pcm_hw_params_set_access(handle, params, SND_PCM_ACCESS_RW_INTERLEAVED); snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_S16_LE); snd_pcm_hw_params_set_channels(handle, params, 2); val = 44100; snd_pcm_hw_params_set_rate_near(handle, params, &val, &dir); if ( (rc = snd_pcm_hw_params(handle, params)) < 0) { std::cerr << "unable to set hw parameters: " << snd_strerror(rc) << std::endl; exit(1); } std::cout << "PCM handle name = " << snd_pcm_name(handle) << std::endl; std::cout << "PCM state = " << snd_pcm_state_name(snd_pcm_state(handle)) << std::endl; snd_pcm_hw_params_get_access(params, (snd_pcm_access_t *)&val); std::cout << "access type = " << snd_pcm_access_name((snd_pcm_access_t)val) << std::endl; snd_pcm_hw_params_get_format(params, (snd_pcm_format_t*)(&val)); std::cout << "format = '" << snd_pcm_format_name((snd_pcm_format_t)val) << "' (" << snd_pcm_format_description((snd_pcm_format_t)val) << ")" << std::endl; snd_pcm_hw_params_get_subformat(params, (snd_pcm_subformat_t *)&val); std::cout << "subformat = '" << snd_pcm_subformat_name((snd_pcm_subformat_t)val) << "' (" << snd_pcm_subformat_description((snd_pcm_subformat_t)val) << ")" << std::endl; snd_pcm_hw_params_get_channels(params, &val); std::cout << "channels = " << val << std::endl; snd_pcm_hw_params_get_rate(params, &val, &dir); std::cout << "rate = " << val << " bps" << std::endl; snd_pcm_hw_params_get_period_time(params, &val, &dir); std::cout << "period time = " << val << " us" << std::endl; snd_pcm_hw_params_get_period_size(params, &frames, &dir); std::cout << "period size = " << static_cast<int>(frames) << " frames" << std::endl; snd_pcm_hw_params_get_buffer_time(params, &val, &dir); std::cout << "buffer time = " << val << " us" << std::endl; snd_pcm_hw_params_get_buffer_size(params, (snd_pcm_uframes_t *) &val); std::cout << "buffer size = " << val << " frames" << std::endl; snd_pcm_hw_params_get_periods(params, &val, &dir); std::cout << "periods per buffer = " << val << " frames" << std::endl; snd_pcm_hw_params_get_rate_numden(params, &val, &val2); std::cout << "exact rate = " << val/val2 << " bps" << std::endl; val = snd_pcm_hw_params_get_sbits(params); std::cout << "significant bits = " << val << std::endl; snd_pcm_hw_params_get_tick_time(params, &val, &dir); std::cout << "tick time = " << val << " us" << std::endl; val = snd_pcm_hw_params_is_batch(params); std::cout << "is batch = " << val << std::endl; val = snd_pcm_hw_params_is_block_transfer(params); std::cout << "is block transfer = " << val << std::endl; val = snd_pcm_hw_params_is_double(params); std::cout << "is double = " << val << std::endl; val = snd_pcm_hw_params_is_half_duplex(params); std::cout << "is half duplex = " << val << std::endl; val = snd_pcm_hw_params_is_joint_duplex(params); std::cout << "is joint duplex = " << val << std::endl; val = snd_pcm_hw_params_can_overrange(params); std::cout << "can overrange = " << val << std::endl; val = snd_pcm_hw_params_can_mmap_sample_resolution(params); std::cout << "can mmap = " << val << std::endl; val = snd_pcm_hw_params_can_pause(params); std::cout << "can pause = " << val << std::endl; val = snd_pcm_hw_params_can_resume(params); std::cout << "can resume = " << val << std::endl; val = snd_pcm_hw_params_can_sync_start(params); std::cout << "can sync start = " << val << std::endl; snd_pcm_close(handle); return 0; }
int main(int argc, char **argv){ int i; int aver,val,val2; int16_t buf[BUFSIZE]; double d_buffer[BUFSIZE]; double pitch = 0.0; struct timespec before,after; struct pitch_tracker_params *settings; snd_pcm_uframes_t period_size = PERIOD_SIZE; //ALSA PCM configuration snd_pcm_t *handle; snd_pcm_hw_params_t *params; int dir,rc; snd_pcm_uframes_t frames; /* Open PCM device for capture */ rc = snd_pcm_open( &handle, "default" , SND_PCM_STREAM_CAPTURE , 0); if(rc < 0 ){ fprintf(stderr,"unable to open pcm device: %s\n",snd_strerror(rc)); exit(1); } /* Allocate a hardware parameters object. */ snd_pcm_hw_params_alloca(¶ms); /* Fill it in with default values. */ snd_pcm_hw_params_any(handle, params); /* Set the desired hardware parameters. */ /* Interleaved mode */ snd_pcm_hw_params_set_access(handle, params,SND_PCM_ACCESS_RW_INTERLEAVED); /* unsigned 16-bit format */ snd_pcm_hw_params_set_format(handle, params,SND_PCM_FORMAT_S16); snd_pcm_hw_params_set_channels(handle, params, 1); /* 44100 bits/second sampling rate */ val = 44100; snd_pcm_hw_params_set_rate_near(handle,params, &val, &dir); /* set size time*/ snd_pcm_hw_params_set_period_size_near(handle, params, &period_size , &dir); /* write configuration */ rc = snd_pcm_hw_params(handle,params); /*Display info*/ printf("PCM handle name = '%s'\n", snd_pcm_name(handle)); printf("PCM state = %s\n", snd_pcm_state_name(snd_pcm_state(handle))); snd_pcm_hw_params_get_access(params, (snd_pcm_access_t *) &val); printf("access type = %s\n", snd_pcm_access_name((snd_pcm_access_t)val)); snd_pcm_hw_params_get_format(params, &val); printf("format = '%s' (%s)\n", snd_pcm_format_name((snd_pcm_format_t)val), snd_pcm_format_description( (snd_pcm_format_t)val)); snd_pcm_hw_params_get_subformat(params, (snd_pcm_subformat_t *)&val); printf("subformat = '%s' (%s)\n", snd_pcm_subformat_name((snd_pcm_subformat_t)val), snd_pcm_subformat_description( (snd_pcm_subformat_t)val)); snd_pcm_hw_params_get_channels(params, &val); printf("channels = %d\n", val); snd_pcm_hw_params_get_rate(params, &val, &dir); printf("rate = %d bps\n", val); snd_pcm_hw_params_get_period_time(params, &val, &dir); printf("period time = %d us\n", val); snd_pcm_hw_params_get_period_size(params, &frames, &dir); printf("period size = %d frames\n", (int)frames); snd_pcm_hw_params_get_buffer_time(params, &val, &dir); printf("buffer time = %d us\n", val); snd_pcm_hw_params_get_buffer_size(params, (snd_pcm_uframes_t *) &val); printf("buffer size = %d frames\n", val); snd_pcm_hw_params_get_periods(params, &val, &dir); printf("periods per buffer = %d frames\n", val); snd_pcm_hw_params_get_rate_numden(params, &val, &val2); printf("exact rate = %d/%d bps\n", val, val2); val = snd_pcm_hw_params_get_sbits(params); printf("significant bits = %d\n", val); val = snd_pcm_hw_params_is_batch(params); printf("is batch = %d\n", val); val = snd_pcm_hw_params_is_block_transfer(params); printf("is block transfer = %d\n", val); val = snd_pcm_hw_params_is_double(params); printf("is double = %d\n", val); val = snd_pcm_hw_params_is_half_duplex(params); printf("is half duplex = %d\n", val); val = snd_pcm_hw_params_is_joint_duplex(params); printf("is joint duplex = %d\n", val); val = snd_pcm_hw_params_can_overrange(params); printf("can overrange = %d\n", val); val = snd_pcm_hw_params_can_mmap_sample_resolution(params); printf("can mmap = %d\n", val); val = snd_pcm_hw_params_can_pause(params); printf("can pause = %d\n", val); val = snd_pcm_hw_params_can_resume(params); printf("can resume = %d\n", val); val = snd_pcm_hw_params_can_sync_start(params); printf("can sync start = %d\n", val); settings = open_pitch_tracker(); while(1){ rc = snd_pcm_readi(handle, buf, frames); if (rc == -EPIPE) { /* EPIPE means overrun */ fprintf(stderr, "overrun occurred\n"); snd_pcm_prepare(handle); } else if (rc < 0) { fprintf(stderr, "error from read: %s\n", snd_strerror(rc)); } else if (rc != (int)frames) { fprintf(stderr, "short read, read %d frames\n", rc); } for( i = 0 ; i< BUFSIZE ; i++){ d_buffer[i] = (double) buf[i]; } pitch = compute_pitch(d_buffer, BUFSIZE, S16, settings ,ACCURACY); if( pitch != 0.0 ) printf("frequency -> %f\n",pitch); memset(buf,0,BUFSIZE); } close_pitch_tracker(&settings); snd_pcm_drain(handle); snd_pcm_close(handle); return 0; }
bool QAudioInputPrivate::open( QObject *input ) { // Open the Alsa capture device. bool rc = true; int err; unsigned int freakuency = frequency; if ((err = snd_pcm_open(&handle, m_device.constData(), //"plughw:0,0" SND_PCM_STREAM_CAPTURE, 0/*SND_PCM_ASYNC*/)) < 0) { qWarning( "QAudioInput: snd_pcm_open: error %d", err); rc = false; } else { snd_pcm_hw_params_t *hwparams; // We want non-blocking mode. snd_pcm_nonblock(handle, 1); // Set the desired parameters. snd_pcm_hw_params_alloca(&hwparams); err = snd_pcm_hw_params_any(handle, hwparams); if ( err < 0 ) { qWarning( "QAudioInput: snd_pcm_hw_params_any: err %d", err); } err = snd_pcm_hw_params_set_access(handle, hwparams, access); if ( err < 0 ) { qWarning( "QAudioInput: snd_pcm_hw_params_set_access: err %d",err); } err = snd_pcm_hw_params_set_format(handle, hwparams,format); if ( err < 0 ) { qWarning( "QAudioInput: snd_pcm_hw_params_set_format: err %d",err); } err = snd_pcm_hw_params_set_channels(handle,hwparams,(unsigned int)channels); if ( err < 0 ) { qWarning( "QAudioInput: snd_pcm_hw_params_set_channels: err %d",err); } err = snd_pcm_hw_params_set_rate_near(handle, hwparams, &freakuency, 0); if ( err < 0 ) { qWarning( "QAudioInput: snd_pcm_hw_params_set_rate_near: err %d",err); } if(freakuency > 1.05 * frequency || freakuency < 0.95 * frequency) { qWarning("QAudioInput: warning, sample rate %i not supported by the hardware, using %u", frequency, freakuency); } if ( samplesPerBlock != -1 ) { // Set buffer and period sizes based on the supplied block size. sample_size = (snd_pcm_uframes_t)( samplesPerBlock * channels / 8 ); err = snd_pcm_hw_params_set_rate_near(handle, hwparams, &freakuency, 0); if ( err < 0 ) { qWarning( "QAudioInput: snd_pcm_hw_params_set_rate_near: err %d",err); } if(freakuency > 1.05 * frequency || freakuency < 0.95 * frequency) { qWarning( "QAudioInput: warning, sample rate %i not supported by the hardware, using %u", frequency, freakuency); } err = snd_pcm_hw_params_set_buffer_time_near(handle, hwparams, &buffer_time, 0); if ( err < 0 ) { qWarning( "QAudioInput: snd_pcm_hw_params_set_buffer_time_near: err %d",err); } period_time = 1000000 * 256 / frequency; err = snd_pcm_hw_params_set_period_time_near(handle, hwparams, &period_time, 0); if ( err < 0 ) { qWarning( "QAudioInput: snd_pcm_hw_params_set_period_time_near: err %d",err); } } else { // Use the largest buffer and period sizes we can. err = snd_pcm_hw_params_set_buffer_time_near(handle, hwparams, &buffer_time, 0); if ( err < 0 ) { qWarning( "QAudioInput: snd_pcm_hw_params_set_buffer_time_near: err %d",err); } period_time = 1000000 * 256 / frequency; err = snd_pcm_hw_params_set_period_time_near(handle, hwparams, &period_time, 0); if ( err < 0 ) { qWarning( "QAudioInput: snd_pcm_hw_params_set_period_time_near: err %d",err); } } err = snd_pcm_hw_params(handle, hwparams); if ( err < 0 ) { qWarning( "QAudioInput: snd_pcm_hw_params: err %d",err); } int dir; unsigned int vval, vval2; snd_pcm_access_t aval; snd_pcm_format_t fval; snd_pcm_subformat_t sval; qLog(QAudioInput) << "PCM handle name = " << snd_pcm_name(handle); qLog(QAudioInput) << "PCM state = " << snd_pcm_state_name(snd_pcm_state(handle)); snd_pcm_hw_params_get_access(hwparams,&aval); vval = (unsigned int)aval; if ( (int)vval != (int)access ) { qLog(QAudioInput) << QString("access type not set, want %1 got %2") .arg(snd_pcm_access_name((snd_pcm_access_t)access)) .arg(snd_pcm_access_name((snd_pcm_access_t)vval)); access = (snd_pcm_access_t)vval; } qLog(QAudioInput) << "access type = " << snd_pcm_access_name((snd_pcm_access_t)vval); snd_pcm_hw_params_get_format(hwparams, &fval); vval = (unsigned int)fval; if ( (int)vval != (int)format ) { qLog(QAudioInput) << QString("format type not set, want %1 got %2") .arg(snd_pcm_format_name((snd_pcm_format_t)format)) .arg(snd_pcm_format_name((snd_pcm_format_t)vval)); format = (snd_pcm_format_t)vval; } qLog(QAudioInput) << QString("format = '%1' (%2)") .arg(snd_pcm_format_name((snd_pcm_format_t)vval)) .arg(snd_pcm_format_description((snd_pcm_format_t)vval)) .toLatin1().constData(); snd_pcm_hw_params_get_subformat(hwparams,&sval); vval = (unsigned int)sval; qLog(QAudioInput) << QString("subformat = '%1' (%2)") .arg(snd_pcm_subformat_name((snd_pcm_subformat_t)vval)) .arg(snd_pcm_subformat_description((snd_pcm_subformat_t)vval)) .toLatin1().constData(); snd_pcm_hw_params_get_channels(hwparams, &vval); if ( (int)vval != (int)channels ) { qLog(QAudioInput) << QString("channels type not set, want %1 got %2").arg(channels).arg(vval); channels = vval; } qLog(QAudioInput) << "channels = " << vval; snd_pcm_hw_params_get_rate(hwparams, &vval, &dir); if ( (int)vval != (int)frequency ) { qLog(QAudioInput) << QString("frequency type not set, want %1 got %2").arg(frequency).arg(vval); frequency = vval; } qLog(QAudioInput) << "rate =" << vval << " bps"; snd_pcm_hw_params_get_period_time(hwparams,&period_time, &dir); qLog(QAudioInput) << "period time =" << period_time << " us"; snd_pcm_hw_params_get_period_size(hwparams,&period_size, &dir); qLog(QAudioInput) << "period size =" << (int)period_size; snd_pcm_hw_params_get_buffer_time(hwparams,&buffer_time, &dir); qLog(QAudioInput) << "buffer time =" << buffer_time; snd_pcm_hw_params_get_buffer_size(hwparams,(snd_pcm_uframes_t *) &buffer_size); qLog(QAudioInput) << "buffer size =" << (int)buffer_size; snd_pcm_hw_params_get_periods(hwparams, &vval, &dir); qLog(QAudioInput) << "periods per buffer =" << vval; snd_pcm_hw_params_get_rate_numden(hwparams, &vval, &vval2); qLog(QAudioInput) << QString("exact rate = %1/%2 bps").arg(vval).arg(vval2).toLatin1().constData(); vval = snd_pcm_hw_params_get_sbits(hwparams); qLog(QAudioInput) << "significant bits =" << vval; snd_pcm_hw_params_get_tick_time(hwparams,&vval, &dir); qLog(QAudioInput) << "tick time =" << vval; vval = snd_pcm_hw_params_is_batch(hwparams); qLog(QAudioInput) << "is batch =" << vval; vval = snd_pcm_hw_params_is_block_transfer(hwparams); qLog(QAudioInput) << "is block transfer =" << vval; vval = snd_pcm_hw_params_is_double(hwparams); qLog(QAudioInput) << "is double =" << vval; vval = snd_pcm_hw_params_is_half_duplex(hwparams); qLog(QAudioInput) << "is half duplex =" << vval; vval = snd_pcm_hw_params_is_joint_duplex(hwparams); qLog(QAudioInput) << "is joint duplex =" << vval; vval = snd_pcm_hw_params_can_overrange(hwparams); qLog(QAudioInput) << "can overrange =" << vval; vval = snd_pcm_hw_params_can_mmap_sample_resolution(hwparams); qLog(QAudioInput) << "can mmap =" << vval; vval = snd_pcm_hw_params_can_pause(hwparams); qLog(QAudioInput) << "can pause =" << vval; vval = snd_pcm_hw_params_can_resume(hwparams); qLog(QAudioInput) << "can resume =" << vval; vval = snd_pcm_hw_params_can_sync_start(hwparams); qLog(QAudioInput) << "can sync start =" << vval; snd_pcm_sw_params_t *swparams; snd_pcm_sw_params_alloca(&swparams); err = snd_pcm_sw_params_current(handle, swparams); if ( err < 0 ) { qWarning( "QAudioInput: snd_pcm_sw_params_current: err %d",err); } err = snd_pcm_sw_params_set_start_threshold(handle,swparams,period_size); if ( err < 0 ) { qWarning( "QAudioInput: snd_pcm_sw_params_set_start_threshold: err %d",err); } err = snd_pcm_sw_params_set_avail_min(handle, swparams,period_size); if ( err < 0 ) { qWarning( "QAudioInput: snd_pcm_sw_params_set_avail_min: err %d",err); } err = snd_pcm_sw_params_set_xfer_align(handle, swparams, 1); if ( err < 0 ) { qWarning( "QAudioInput: snd_pcm_sw_params_set_xfer_align: err %d",err); } err = snd_pcm_sw_params(handle, swparams); if ( err < 0 ) { qWarning( "QAudioInput: snd_pcm_sw_params: err %d",err); } snd_pcm_prepare(handle); snd_pcm_start(handle); int count = snd_pcm_poll_descriptors_count(handle); pollfd *pfds = new pollfd[count]; snd_pcm_poll_descriptors(handle, pfds, count); for (int i = 0; i < count; ++i) { if ((pfds[i].events & POLLIN) != 0) { notifier = new QSocketNotifier(pfds[i].fd, QSocketNotifier::Read); QObject::connect(notifier, SIGNAL(activated(int)), input, SIGNAL(readyRead())); break; } } if (notifier == NULL) { rc = false; } delete pfds; } return rc; }
int main() { long loops; int rc,i = 0; int size; FILE *fp ; snd_pcm_t *handle; snd_pcm_hw_params_t *params; unsigned int val,val2; int dir; snd_pcm_uframes_t frames; char *buffer; if( (fp =fopen("sound.wav","w")) < 0) printf("open sound.wav fial\n"); /* Open PCM device for recording (capture). */ rc = snd_pcm_open(&handle, "default", SND_PCM_STREAM_CAPTURE, 0); if (rc < 0) { fprintf(stderr, "unable to open pcm device: %s/n", snd_strerror(rc)); exit(1); } /* Allocate a hardware parameters object. */ snd_pcm_hw_params_alloca(¶ms); /* Fill it in with default values. */ snd_pcm_hw_params_any(handle, params); /* Set the desired hardware parameters. */ /* Interleaved mode */ snd_pcm_hw_params_set_access(handle, params, SND_PCM_ACCESS_RW_INTERLEAVED); /* Signed 16-bit little-endian format */ snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_S16_LE); /* Two channels (stereo) */ snd_pcm_hw_params_set_channels(handle, params, 2); /* 44100 bits/second sampling rate (CD quality) */ val = 44100; snd_pcm_hw_params_set_rate_near(handle, params, &val, &dir); /* Set period size to 32 frames. */ frames = 32; snd_pcm_hw_params_set_period_size_near(handle, params, &frames, &dir); /* Write the parameters to the driver */ rc = snd_pcm_hw_params(handle, params); if (rc < 0) { fprintf(stderr, "unable to set hw parameters: %s/n", snd_strerror(rc)); exit(1); } /* Use a buffer large enough to hold one period */ snd_pcm_hw_params_get_period_size(params, &frames, &dir); size = frames * 4; /* 2 bytes/sample, 2 channels */ printf("size = %d\n",size); buffer = (char *) malloc(size); /* We want to loop for 5 seconds */ snd_pcm_hw_params_get_period_time(params, &val, &dir); loops = 10000000 / val; while (loops > 0) { loops--; rc = snd_pcm_readi(handle, buffer, frames); printf("%d\n",i++); if (rc == -EPIPE) { /* EPIPE means overrun */ fprintf(stderr, "overrun occurred/n"); snd_pcm_prepare(handle); } else if (rc < 0) { fprintf(stderr, "error from read: %s/n", snd_strerror(rc)); } else if (rc != (int)frames) { fprintf(stderr, "short read, read %d frames/n", rc); } //rc = fwrite( buffer,1, size,fp); rc = write(1,buffer,size); if (rc != size) fprintf(stderr, "short write: wrote %d bytes/n", rc); else printf("fwrite buffer success\n"); } /******************打印参数*********************/ snd_pcm_hw_params_get_channels(params, &val); printf("channels = %d\n", val); snd_pcm_hw_params_get_rate(params, &val, &dir); printf("rate = %d bps\n", val); snd_pcm_hw_params_get_period_time(params, &val, &dir); printf("period time = %d us\n", val); snd_pcm_hw_params_get_period_size(params, &frames, &dir); printf("period size = %d frames\n", (int)frames); snd_pcm_hw_params_get_buffer_time(params, &val, &dir); printf("buffer time = %d us\n", val); snd_pcm_hw_params_get_buffer_size(params, (snd_pcm_uframes_t *) &val); printf("buffer size = %d frames\n", val); snd_pcm_hw_params_get_periods(params, &val, &dir); printf("periods per buffer = %d frames\n", val); snd_pcm_hw_params_get_rate_numden(params, &val, &val2); printf("exact rate = %d/%d bps\n", val, val2); val = snd_pcm_hw_params_get_sbits(params); printf("significant bits = %d\n", val); //snd_pcm_hw_params_get_tick_time(params, &val, &dir); printf("tick time = %d us\n", val); val = snd_pcm_hw_params_is_batch(params); printf("is batch = %d\n", val); val = snd_pcm_hw_params_is_block_transfer(params); printf("is block transfer = %d\n", val); val = snd_pcm_hw_params_is_double(params); printf("is double = %d\n", val); val = snd_pcm_hw_params_is_half_duplex(params); printf("is half duplex = %d\n", val); val = snd_pcm_hw_params_is_joint_duplex(params); printf("is joint duplex = %d\n", val); val = snd_pcm_hw_params_can_overrange(params); printf("can overrange = %d\n", val); val = snd_pcm_hw_params_can_mmap_sample_resolution(params); printf("can mmap = %d\n", val); val = snd_pcm_hw_params_can_pause(params); printf("can pause = %d\n", val); val = snd_pcm_hw_params_can_resume(params); printf("can resume = %d\n", val); val = snd_pcm_hw_params_can_sync_start(params); printf("can sync start = %d\n", val); /*******************************************************************/ snd_pcm_drain(handle); snd_pcm_close(handle); fclose(fp); free(buffer); return 0; }
int main() { int result; snd_pcm_t *handle = NULL; snd_pcm_hw_params_t *params = NULL; snd_pcm_uframes_t frames; snd_pcm_access_t access; snd_pcm_format_t format; unsigned int rate = 44100; unsigned int val, val2; int dir = 0; const char *device = getenv ("ALSA_DEFAULT"); if (device == NULL) { device = "default"; } result = snd_pcm_open(&handle, device, SND_PCM_STREAM_PLAYBACK, 0); if (result < 0) showErrorAndExit(result, "Error: Unable to open PCM device: %s\n"); result = snd_pcm_hw_params_malloc(¶ms); if (result < 0) showErrorAndExit(result, "Error: No memory for hardware parameters: %s\n"); result = snd_pcm_hw_params_any(handle, params); if (result < 0) showErrorAndExit(result, "Error: Cannot read HW params: %s\n"); result = snd_pcm_hw_params_set_access(handle, params, SND_PCM_ACCESS_RW_INTERLEAVED); if (result < 0) showErrorAndExit(result, "Could not set access method: %s\n"); result = snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_S16_LE); if (result < 0) showErrorAndExit(result, "Error: Could not set output format: %s\n"); result = snd_pcm_hw_params_set_channels(handle, params, 1); if (result < 0) showErrorAndExit(result, "Error: Cannot set to 1 channel: %s\n"); result = snd_pcm_hw_params_set_rate_near(handle, params, &rate, &dir); if (result < 0) showErrorAndExit(result, "Error: Could not set rate: %s\n"); result = snd_pcm_hw_params(handle, params); if (result < 0) showErrorAndExit(result, "Error: Could not write HW params: %s\n"); printf("Card Parameters\n"); printf("%30s: %s\n", "Alsa Library Version", snd_asoundlib_version()); result = snd_pcm_hw_params_get_access(params, &access); if (result < 0) { showErrorAndExit(result, "Error: Could not retrieve access mode: %s\n"); } else { printf("%30s: %s\n", "Access Method", snd_pcm_access_name(access)); } result = snd_pcm_hw_params_get_format(params, &format); if (result < 0) { showErrorAndExit(result, "Error: Unable to retrieve format type: %d\n"); } else { printf("%30s: %s\n", "Format", snd_pcm_format_name(format)); } result = snd_pcm_hw_params_get_channels(params, &val); if (result < 0) { showErrorAndExit(result, "Error: Unable to retrieve channel count: %s\n"); } else { printf("%30s: %d\n", "Channels", val); } result = snd_pcm_hw_params_get_rate(params, &val, &dir); if (result < 0) { showErrorAndExit(result, "Error: Unable to retrieve rate: %s\n"); } else { printf("%30s: %d bps\n", "Rate", val); } result = snd_pcm_hw_params_get_period_time(params, &val, &dir); if (result < 0) { showErrorAndExit(result, "Error: Unable to retrieve period time: %s\n"); } else { printf("%30s: %d us\n", "Period Time", val); } result = snd_pcm_hw_params_get_period_size(params, &frames, &dir); if (result < 0) { showErrorAndExit(result, "Error: Unable to retrieve period size: %s\n"); } else { printf("%30s: %d frames\n", "Period Size", (int) frames); } result = snd_pcm_hw_params_get_buffer_time(params, &val, &dir); if (result < 0) { showErrorAndExit(result, "Error: Unable to retrieve buffer time: %s\n"); } else { printf("%30s: %d us\n", "Buffer Time", val); } result = snd_pcm_hw_params_get_buffer_size(params, &frames); if (result < 0) { showErrorAndExit(result, "Error: Unable to retrieve buffer size: %s\n"); } else { printf("%30s: %d frames\n", "Buffer Size", (int) frames); } result = snd_pcm_hw_params_get_periods(params, &val, &dir); if (result < 0) { showErrorAndExit(result, "Error: Unable to get buffer periods: %s\n"); } else { printf("%30s: %d frames\n", "Periods per Buffer", val); } result = snd_pcm_hw_params_get_rate_numden(params, &val, &val2); if (result < 0) { showErrorAndExit(result, "Error: Unable to get rate numerator/denominator: %s\n"); } else { printf("%30s: %d/%d bps\n", "Exact Rate", val, val2); } val = snd_pcm_hw_params_get_sbits(params); printf("%30s: %d\n", "Significant Bits", val); result = snd_pcm_hw_params_get_tick_time(params, &val, &dir); if (result < 0) { showErrorAndExit(result, "Error: Could not retrieve tick time: %s\n"); } else { printf("%30s: %d\n", "Tick Time", val); } printf("Card Capabilities\n"); val = snd_pcm_hw_params_is_batch(params); printf("%30s: %s\n", "Batch Transfer", (val ? "Yes" : "No")); val = snd_pcm_hw_params_is_block_transfer(params); printf("%30s: %s\n", "Block Transfer", (val ? "Yes" : "No")); val = snd_pcm_hw_params_is_double(params); printf("%30s: %s\n", "Double Buffering", (val ? "Yes" : "No")); val = snd_pcm_hw_params_is_half_duplex(params); printf("%30s: %s\n", "Half Duplex Only", (val ? "Yes" : "No")); val = snd_pcm_hw_params_is_joint_duplex(params); printf("%30s: %s\n", "Joint Duplex Capable", (val ? "Yes" : "No")); val = snd_pcm_hw_params_can_overrange(params); printf("%30s: %s\n", "Support Overrange Detection", (val ? "Yes" : "No")); val = snd_pcm_hw_params_can_mmap_sample_resolution(params); printf("%30s: %s\n", "Support Sample-res Mmap", (val ? "Yes" : "No")); val = snd_pcm_hw_params_can_pause(params); printf("%30s: %s\n", "Can Pause", (val ? "Yes" : "No")); val = snd_pcm_hw_params_can_resume(params); printf("%30s: %s\n", "Can Resume", (val ? "Yes" : "No")); val = snd_pcm_hw_params_can_sync_start(params); printf("%30s: %s\n", "Support Sync Start", (val ? "Yes" : "No")); result = snd_pcm_close(handle); if (result < 0) showErrorAndExit(result, "Error: Could not close PCM device: %s\n"); return 0; }
static void *dev_thread(void *arg) { // capture thread: keep reading and ring-buffering till told to quit int ret, frames, i, j, shift, bits, isfloat; int sample_bytes; uint32_t (*puller)(unsigned char **, int); S32 sample; double scale; snd_pcm_format_t format; int avail; sample_t fsample; unsigned char *buffer, *pt; ALSA_CARD *card; card = (ALSA_CARD *)arg; log_msg("ALSA: recv from %s '%s'\n", card->device, card->name); buffer = (unsigned char *)malloc(card->blocksize * QMX_CHANNELS * sizeof(float)); snd_pcm_prepare(card->handle); bits = snd_pcm_hw_params_get_sbits(card->hparams); sample_bytes = bits / 8; snd_pcm_hw_params_get_format(card->hparams, &format); if ((isfloat = snd_pcm_format_float(format))) scale = 1.0; else scale = pow(2.0 , 1 - bits); log_msg("ALSA: 1/scale %f [%d]\n", 1.0 / scale, bits); card->running = 1; card->ringbuf = jack_ringbuffer_create(sizeof(sample_t) * RB_SECS * sampling_rate * QMX_CHANNELS + 0.5); if (snd_pcm_format_big_endian(format) == 1) puller = bepull; else puller = lepull; shift = 8 * (sizeof(uint32_t) - sample_bytes); ret = snd_pcm_readi(card->handle, buffer, card->blocksize); // prime pump while (card->running) { if ((ret = snd_pcm_wait(card->handle, 1000)) < 0) { if (ret == -EPIPE) { log_msg("ALSA: wait: EPIPE, recover...\n"); try_recover(card, ret, buffer); } else if (ret == -ESTRPIPE) { log_msg("ALSA: wait: ESTRPIPE, recover...\n"); try_recover(card, ret, buffer); } else log_msg("ALSA: poll failed %s\n", strerror(errno)); continue; } else if (ret == 0) { log_msg("ALSA: card timeout...\n"); continue; } avail = snd_pcm_avail_update(card->handle); if (avail < 0) { if (avail == -EPIPE) { log_msg("ALSA: avail_update: EPIPE, recover...\n"); try_recover(card, avail, buffer); continue; } else { log_msg("ALSA: weird avail %d\n", avail); break; } } if (avail > card->blocksize) avail = card->blocksize; frames = snd_pcm_readi(card->handle, (void *)buffer, avail); if (frames < 0) { log_msg("ALSA: read failed %s\n", snd_strerror(frames)); } else if (frames != avail) { log_msg("ALSA: wanted %d got %d\n", avail, frames); } pt = buffer; for (i = 0; i < frames; i++) { for (j = 0; j < QMX_CHANNELS; j++) { sample.u = (*puller)(&pt, sample_bytes); if (isfloat) fsample = sample.f; else { if (shift) sample.s = (sample.s << shift) >> shift; fsample = sample.s * scale; } jack_ringbuffer_write(card->ringbuf, (const char *)&fsample, sizeof(sample_t)); } } } free(buffer); log_msg("ALSA: stopped %s '%s'\n", card->device, card->name); snd_pcm_drain(card->handle); return NULL; }