result alsa_init(Soloud *aSoloud, unsigned int aFlags, unsigned int aSamplerate, unsigned int aBuffer, unsigned int aChannels)
{
ALSAData *data = new ALSAData;
memset(data, 0, sizeof(ALSAData));
aSoloud->mBackendData = data;
aSoloud->mBackendCleanupFunc = alsaCleanup;
data->samples = aBuffer;
data->channels = 2;
data->soloud = aSoloud;
int rc;
snd_pcm_t *handle;
rc = snd_pcm_open(&handle, "default", SND_PCM_STREAM_PLAYBACK, 0);
if (rc < 0)
{
return UNKNOWN_ERROR;
}
data->alsaDeviceHandle = handle;
snd_pcm_hw_params_t *params;
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);
snd_pcm_hw_params_set_buffer_size(handle, params, aBuffer);
unsigned int val = aSamplerate;
int dir = 0;
rc = snd_pcm_hw_params_set_rate_near(handle, params, &val, &dir);
if (rc < 0)
{
return UNKNOWN_ERROR;
}
rc = snd_pcm_hw_params(handle, params);
if (rc < 0)
{
return UNKNOWN_ERROR;
}
snd_pcm_hw_params_get_rate(params, &val, &dir);
aSamplerate = val;
snd_pcm_hw_params_get_channels(params, &val);
data->channels = val;
data->buffer = new float[data->samples*data->channels];
data->sampleBuffer = new short[data->samples*data->channels];
aSoloud->postinit(aSamplerate, data->samples * data->channels, aFlags, 2);
data->threadHandle = Thread::createThread(alsaThread, data);
if (0 == data->threadHandle)
{
return UNKNOWN_ERROR;
}
aSoloud->mBackendString = "ALSA";
return 0;
}
static int ste_iop_hwparams(snd_pcm_ioplug_t *io,
snd_pcm_hw_params_t *params)
{
int err = 0;
int direction;
ste_iop_t *ste_iop = io->private_data;
/* Get and print HW params */
/* PCM format */
err = snd_pcm_hw_params_get_format(params, &ste_iop->hwparams.pcm_format);
if (err < 0) {
fprintf(stderr, "ST-Ericsson ALSA ADM I/O Plugin: Failed to get HW param PCM format: %s\n", snd_strerror(err));
return err;
}
/* PCM access mode */
err = snd_pcm_hw_params_get_access(params, &ste_iop->hwparams.pcm_access);
if (err < 0) {
fprintf(stderr, "ST-Ericsson ALSA ADM I/O Plugin: Failed to get HW param PCM Access mode: %s\n",
snd_strerror(err));
return err;
}
/* PCM number of channels */
err = snd_pcm_hw_params_get_channels(params, &ste_iop->hwparams.pcm_channels);
if (err < 0) {
fprintf(stderr, "ST-Ericsson ALSA ADM I/O Plugin: Failed to get HW param PCM number of channels: %s\n",
snd_strerror(err));
return err;
}
/* Sample Rate */
err = snd_pcm_hw_params_get_rate(params, &ste_iop->hwparams.pcm_rate,
&direction);
if (err < 0) {
fprintf(stderr, "ST-Ericsson ALSA ADM I/O Plugin: Failed to get HW param PCM Sample Rate: %s\n",
snd_strerror(err));
return err;
}
ste_iop->bufsz = ste_iop->hwparams.pcm_rate * 32 / 1000 * 2 * ste_iop->hwparams.pcm_channels;
/* Period time */
err = snd_pcm_hw_params_get_period_time(params, &ste_iop->hwparams.pcm_period_time,
&direction);
if (err < 0) {
fprintf(stderr, "ST-Ericsson ALSA ADM I/O Plugin: Failed to get HW param PCM period time: %s\n",
snd_strerror(err));
return err;
}
return 0;
}
AudioSourceNix::AudioSourceNix(int c, int r)
: AudioSource(c, r)
{
int err;
unsigned int ap_rate = rate;
unsigned int ap_chan = channels;
err = snd_pcm_open(&device, ADDR, SND_PCM_STREAM_CAPTURE, 0);
if (err < 0) { g2g = PR_FALSE; return; }
err = snd_pcm_hw_params_malloc(¶ms);
if (err < 0) { g2g = PR_FALSE; return; }
err = snd_pcm_hw_params_any(device, params);
if (err < 0) { g2g = PR_FALSE; return; }
err = snd_pcm_hw_params_set_access(
device, params, SND_PCM_ACCESS_RW_INTERLEAVED
);
if (err < 0) { g2g = PR_FALSE; return; }
err = snd_pcm_hw_params_set_format(
device, params, SND_PCM_FORMAT_S16_LE
);
if (err < 0) { g2g = PR_FALSE; return; }
/* For rate and channels if we don't get
* what we want, that's too bad */
err = snd_pcm_hw_params_set_rate_near(
device, params, &ap_rate, 0
);
if (err < 0) {
err = snd_pcm_hw_params_get_rate(
params, &ap_rate, 0
);
if (err < 0) { g2g = PR_FALSE; return; }
}
err = snd_pcm_hw_params_set_channels(
device, params, ap_chan
);
if (err < 0) {
err = snd_pcm_hw_params_get_channels(
params, &ap_chan
);
if (err < 0) { g2g = PR_FALSE; return; }
}
g2g = PR_TRUE;
rec = PR_FALSE;
rate = ap_rate;
channels = ap_chan;
snd_pcm_close(device);
}
static int
alsa_get_preferred_sample_rate(cubeb * ctx, uint32_t * rate) {
(void)ctx;
int r, dir;
snd_pcm_t * pcm;
snd_pcm_hw_params_t * hw_params;
snd_pcm_hw_params_alloca(&hw_params);
/* get a pcm, disabling resampling, so we get a rate the
* hardware/dmix/pulse/etc. supports. */
r = snd_pcm_open(&pcm, CUBEB_ALSA_PCM_NAME, SND_PCM_STREAM_PLAYBACK, SND_PCM_NO_AUTO_RESAMPLE);
if (r < 0) {
return CUBEB_ERROR;
}
r = snd_pcm_hw_params_any(pcm, hw_params);
if (r < 0) {
snd_pcm_close(pcm);
return CUBEB_ERROR;
}
r = snd_pcm_hw_params_get_rate(hw_params, rate, &dir);
if (r >= 0) {
/* There is a default rate: use it. */
snd_pcm_close(pcm);
return CUBEB_OK;
}
/* Use a common rate, alsa may adjust it based on hw/etc. capabilities. */
*rate = 44100;
r = snd_pcm_hw_params_set_rate_near(pcm, hw_params, rate, NULL);
if (r < 0) {
snd_pcm_close(pcm);
return CUBEB_ERROR;
}
snd_pcm_close(pcm);
return CUBEB_OK;
}
void alsa_print_info(snd_pcm_t * handle, snd_pcm_hw_params_t * hwp) {
printf("device [%s] opened with\n",
snd_pcm_name(handle));
printf("\tstate=%s\n",
snd_pcm_state_name(snd_pcm_state(handle)));
unsigned int val, val2;
snd_pcm_hw_params_get_access(hwp,
(snd_pcm_access_t *) &val);
printf("\taccess_type=%s\n",
snd_pcm_access_name((snd_pcm_access_t)val));
snd_pcm_hw_params_get_format(hwp, (snd_pcm_format_t *) &val);
printf("\tformat=%s\n",
snd_pcm_format_name((snd_pcm_format_t) val)
);
snd_pcm_hw_params_get_channels(hwp, &val);
printf("\tchannels=%d\n", val);
snd_pcm_hw_params_get_rate(hwp, &val, (int *) &val2);
printf("\trate=%d fps\n", val);
snd_pcm_hw_params_get_period_time(hwp,
&val, (int *) &val2);
printf("\tperiod_time=%d us\n", val);
snd_pcm_uframes_t frames;
snd_pcm_hw_params_get_period_size(hwp,
&frames, (int *) &val2);
printf("\tperiod_size=%d frames\n", (int)frames);
snd_pcm_hw_params_get_buffer_size(hwp,
(snd_pcm_uframes_t *) &val);
printf("\tbuffer_size=%d frames\n", val);
snd_pcm_hw_params_get_periods(hwp, &val, (int *) &val2);
printf("\tperiods_per_buffer=%d periods\n", val);
}
int record(int size,char *serverString)
{
unsigned int pcm, tmp, dir;
int rate, channels, seconds;
snd_pcm_t *pcm_handle;
snd_pcm_hw_params_t *params;
snd_pcm_uframes_t frames;
char *buff,*buf;
int buff_size, loops;
int fp;
/*if (argc < 4)
{
printf("Usage: %s <sample_rate> <channels> <seconds>\n",
argv[0]);
return -1;
}*/
rate = 8000;//atoi(argv[1]);
channels = 1;//atoi(argv[2]);
seconds = 10;//atoi(argv[3]);
/* Open the PCM device in playback mode */
if (pcm = snd_pcm_open(&pcm_handle, "default" , SND_PCM_STREAM_PLAYBACK, 0) < 0)
printf("ERROR: Can't open \"%s\" PCM device. %s\n", "default", snd_strerror(pcm));
/* Allocate parameters object and fill it with default values*/
snd_pcm_hw_params_alloca(¶ms);
snd_pcm_hw_params_any(pcm_handle, params);
/* Set parameters */
if (pcm = snd_pcm_hw_params_set_access(pcm_handle, params,SND_PCM_ACCESS_RW_INTERLEAVED) < 0)
printf("ERROR: Can't set interleaved mode. %s\n", snd_strerror(pcm));
if (pcm = snd_pcm_hw_params_set_format(pcm_handle, params,SND_PCM_FORMAT_U8) < 0)
printf("ERROR: Can't set format. %s\n", snd_strerror(pcm));
if (pcm = snd_pcm_hw_params_set_channels(pcm_handle, params, channels) < 0)
printf("ERROR: Can't set channels number. %s\n", snd_strerror(pcm));
if (pcm = snd_pcm_hw_params_set_rate_near(pcm_handle, params, &rate, 0) < 0)
printf("ERROR: Can't set rate. %s\n", snd_strerror(pcm));
/* Write parameters */
if (pcm = snd_pcm_hw_params(pcm_handle, params) < 0)
printf("ERROR: Can't set harware parameters. %s\n", snd_strerror(pcm));
/* Resume information */
printf("PCM name: '%s'\n", snd_pcm_name(pcm_handle));
printf("PCM state: %s\n", snd_pcm_state_name(snd_pcm_state(pcm_handle)));
snd_pcm_hw_params_get_channels(params, &tmp);
printf("channels: %i ", tmp);
if (tmp == 1)
printf("(mono)\n");
else if (tmp == 2)
printf("(stereo)\n");
snd_pcm_hw_params_get_rate(params, &tmp, 0);
printf("rate: %d bps\n", tmp);
printf("seconds: %d\n", seconds);
/* Allocate buffer to hold single period */
snd_pcm_hw_params_get_period_size(params, &frames, 0);
buff_size = frames * channels * 2 /* 2 -> sample size */;
buff = (char *) malloc(buff_size*3);
size = frames * channels * 2 /* 2 -> sample size */;
buf = (char *) realloc((void*)serverString,(size*3));
snd_pcm_hw_params_get_period_time(params, &tmp, NULL);
//fp=open("222.wav",O_RDONLY);
for (loops = (seconds * 1000000) / tmp; loops > 0; loops--)
{
/*
if (pcm = read(fp, buff, buff_size) == 0)
{
printf("Early end of file.\n");
//return 0;
}
*/
if (pcm = snd_pcm_writei(pcm_handle, buf, frames) == -EPIPE)
{
printf("XRUN.\n");
snd_pcm_prepare(pcm_handle);
}
else
if(pcm < 0)
{
printf("ERROR. Can't write to PCM device. %s\n", snd_strerror(pcm));
}
}
snd_pcm_drain(pcm_handle);
snd_pcm_close(pcm_handle);
free(buff);
return 0;
}
int open_alsa_read(struct pcm **p, char *name)
{
snd_pcm_t *pcm;
if (snd_pcm_open(&pcm, name, SND_PCM_STREAM_CAPTURE, 0) < 0) {
fprintf(stderr, "Error opening PCM device %s\n", name);
return 0;
}
snd_pcm_hw_params_t *params;
snd_pcm_hw_params_alloca(¶ms);
if (snd_pcm_hw_params_any(pcm, params) < 0) {
fprintf(stderr, "Can not configure this PCM device.\n");
snd_pcm_close(pcm);
return 0;
}
if (snd_pcm_hw_params_set_access(pcm, params, SND_PCM_ACCESS_RW_INTERLEAVED) < 0) {
fprintf(stderr, "Error setting access.\n");
snd_pcm_close(pcm);
return 0;
}
if (snd_pcm_hw_params_set_format(pcm, params, SND_PCM_FORMAT_S16_LE) < 0) {
fprintf(stderr, "Error setting S16_LE format.\n");
snd_pcm_close(pcm);
return 0;
}
if (snd_pcm_hw_params_set_rate_resample(pcm, params, 0) < 0) {
fprintf(stderr, "Error disabling resampling.\n");
snd_pcm_close(pcm);
return 0;
}
unsigned rate_min = 8000;
int dir_min = 0;
if (snd_pcm_hw_params_set_rate_min(pcm, params, &rate_min, &dir_min) < 0 || rate_min < 8000) {
fprintf(stderr, "Error setting min rate.\n");
snd_pcm_close(pcm);
return 0;
}
if (snd_pcm_hw_params(pcm, params) < 0) {
fprintf(stderr, "Error setting HW params.\n");
snd_pcm_close(pcm);
return 0;
}
unsigned int rate = 0;
if (snd_pcm_hw_params_get_rate(params, &rate, 0) < 0) {
fprintf(stderr, "Error getting rate.\n");
snd_pcm_close(pcm);
return 0;
}
unsigned int channels = 0;
if (snd_pcm_hw_params_get_channels(params, &channels) < 0) {
fprintf(stderr, "Error getting channels.\n");
snd_pcm_close(pcm);
return 0;
}
struct alsa *alsa = (struct alsa *)malloc(sizeof(struct alsa));
alsa->base.close = close_alsa;
alsa->base.info = info_alsa;
alsa->base.rate = rate_alsa;
alsa->base.channels = channels_alsa;
alsa->base.rw = read_alsa;
alsa->base.data = (void *)alsa;
alsa->pcm = pcm;
alsa->r = rate;
alsa->c = channels;
alsa->frames = 0;
*p = &(alsa->base);
return 1;
}
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;
}
// input: ALSA
void* input_alsa(void* data)
{
struct audio_data *audio = (struct audio_data *)data;
signed char *buffer;
snd_pcm_t *handle;
snd_pcm_hw_params_t *params;
unsigned int val;
snd_pcm_uframes_t frames;
val = 44100;
int i, n, o, size, dir, err;
int tempr, templ;
int radj, ladj;
// alsa: open device to capture audio
if ((err = snd_pcm_open(&handle, audio-> source, SND_PCM_STREAM_CAPTURE, 0) < 0)) {
fprintf(stderr,
"error opening stream: %s\n",
snd_strerror(err));
exit(EXIT_FAILURE);
}
#ifdef DEBUG
else printf("open stream successful\n");
#endif
snd_pcm_hw_params_alloca(¶ms); //assembling params
snd_pcm_hw_params_any (handle, params); //setting defaults or something
snd_pcm_hw_params_set_access(handle, params,
SND_PCM_ACCESS_RW_INTERLEAVED); //interleaved mode right left right left
snd_pcm_hw_params_set_format(handle, params,
SND_PCM_FORMAT_S16_LE); //trying to set 16bit
snd_pcm_hw_params_set_channels(handle, params, 2); //assuming stereo
val = 44100;
snd_pcm_hw_params_set_rate_near(handle, params, &val, &dir); //trying 44100 rate
frames = 256;
snd_pcm_hw_params_set_period_size_near(handle, params, &frames,
&dir); //number of frames pr read
err = snd_pcm_hw_params(handle, params); //attempting to set params
if (err < 0) {
fprintf(stderr,
"unable to set hw parameters: %s\n",
snd_strerror(err));
exit(EXIT_FAILURE);
}
snd_pcm_hw_params_get_format(params,
(snd_pcm_format_t * )&val); //getting actual format
//converting result to number of bits
if (val < 6)audio->format = 16;
else if (val > 5 && val < 10)audio->format = 24;
else if (val > 9)audio->format = 32;
snd_pcm_hw_params_get_rate(params, &audio->rate, &dir); //getting rate
snd_pcm_hw_params_get_period_size(params, &frames, &dir);
snd_pcm_hw_params_get_period_time(params, &val, &dir);
size = frames * (audio->format / 8) * 2; // frames * bits/8 * 2 channels
buffer = malloc(size);
radj = audio->format / 4; //adjustments for interleaved
ladj = audio->format / 8;
o = 0;
while (1) {
err = snd_pcm_readi(handle, buffer, frames);
if (err == -EPIPE) {
/* EPIPE means overrun */
#ifdef DEBUG
fprintf(stderr, "overrun occurred\n");
#endif
snd_pcm_prepare(handle);
} else if (err < 0) {
#ifdef DEBUG
fprintf(stderr, "error from read: %s\n", snd_strerror(err));
#endif
} else if (err != (int)frames) {
#ifdef DEBUG
fprintf(stderr, "short read, read %d %d frames\n", err, (int)frames);
#endif
}
//sorting out one channel and only biggest octet
n = 0; //frame counter
for (i = 0; i < size ; i = i + (ladj) * 2) {
//first channel
tempr = (buffer[i + (radj) - 1]);
//other channel
templ = (buffer[i + (ladj) - 1]);
//first channel
//using the 10 upper bits this would give me a vert res of 1024, enough...
//tempr = ((buffer[i + (radj) - 1 ] << 2));
//lo = ((buffer[i + (radj) - 2] >> 6));
//if (lo < 0)lo = abs(lo) + 1;
//if (tempr >= 0)tempr = tempr + lo;
//if (tempr < 0)tempr = tempr - lo;
//other channel
//templ = (buffer[i + (ladj) - 1] << 2);
//lo = (buffer[i + (ladj) - 2] >> 6);
//if (lo < 0)lo = abs(lo) + 1;
//if (templ >= 0)templ = templ + lo;
//else templ = templ - lo;
//mono: adding channels and storing it in the buffer
if (audio->channels == 1) audio->audio_out_l[o] = (tempr + templ) / 2;
//stereo storing channels in buffer
if (audio->channels == 2) {
audio->audio_out_l[o] = templ;
audio->audio_out_r[o] = tempr;
}
//o++;
//if (o == 2047) o = 0;
o = (o + 1) % 2047;
n++;
}
}
}
main(int argc, char **argv){
snd_pcm_t *handle;
snd_pcm_hw_params_t *params;
snd_pcm_uframes_t frames;
//the libsamplerate stuff
SRC_DATA datastr;//holds the data(inpu and output),input frames used, output frames generated
SRC_STATE *statestr;//holds the state
int error;
//the lbsndfile stuff, one keeps the header the other the data
SF_INFO sfinf;//has all the info like total frames,samplerate, channels, mode
SNDFILE *input = NULL;
//buffers used in computation to pass to the playback function
float *buffin = NULL;//float into the converter
float *filein = NULL;
float *flangebuffout = NULL;//float to traverse the array for getting flange effects
float *flangebase = NULL;//float to fix the array for initialising the flange effects
float *buffout = NULL;//float out of the converter
short *final = NULL;//final array to write to snd card
float fldelmax = 256;
float flfreq = 1;
float flgain = .5;
int fltime = 0;
int pcm, readcount, pcmrc, blah;//pcm is used for error checking the alsa stuff, pcmrc is used in the main loop
float *eofin;//to point to the end of the file's raw data
int tmp;//used to hold information that is printed in stdio
int i = 0;//index for initialising the output DAC
// float fldelmax, flgain, flfreq;
// pointer for the file input
if (argc != 3){
printf("Usage requires music file and src ratio, please try again\n\n");
return 0;
}
char *inputname = argv[1];
//int *filein = argv[1];
input = sf_open(inputname, SFM_READ, &sfinf);
if (input == NULL){
printf("could not open file sorry \n\n");
return 0;
}
fprintf(stderr, "Channels : %d\n", sfinf.channels);
fprintf(stderr, "Sample rate; %d\n", sfinf.samplerate);
fprintf(stderr, "Sections: %d\n", sfinf.sections);
fprintf(stderr, "Format: %d\n", sfinf.format);
// fprintf(stderr, "Frame Count: %d\n", sfinf.frames);
//fprintf(stderr, "size: %d\n", sizeof(short));
//open sndcard
if ((filein = malloc(sizeof(float)*sfinf.channels*sfinf.frames)) == NULL)
{
printf("MAN YOU OUT OF MEM");
return 0;
}
blah = sf_readf_float(input, filein, sfinf.frames);
buffin = filein;
eofin = filein + (sfinf.frames)*sfinf.channels;
if (pcm =snd_pcm_open(&handle, PCM_DEVICE, SND_PCM_STREAM_PLAYBACK, 0)< 0){
printf("Error: CANNOT OPEN PCM DEVICE\n");
}
//allocate default parameters
snd_pcm_hw_params_alloca(¶ms);
snd_pcm_hw_params_any(handle, params);
//set parameters
if (pcm = snd_pcm_hw_params_set_access(handle, params, SND_PCM_ACCESS_RW_INTERLEAVED)< 0){
printf("Cannot set interleaved mode\n");
}
if (pcm = snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_S16_LE)< 0){
printf("CANNOT SET FORMAT\n");
}
if (pcm = snd_pcm_hw_params_set_channels(handle, params, sfinf.channels)< 0){
printf("CANNOT SET CHANNELS \n");
}
if (pcm = snd_pcm_hw_params_set_rate(handle, params, sfinf.samplerate, 0)< 0){
printf("CANNOT SET SAMPLERATES \n");
}
if (pcm = snd_pcm_hw_params_set_periods(handle, params,1024, 0) < 0){
printf("CANNOT SET PERIOD TO 128");
}
//write parameters
if (pcm = snd_pcm_hw_params(handle, params)< 0){
printf("CANNOT SET HARDWARE PARAMETERS\n");
}
printf("PCm 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_channels(params, &tmp);
printf("channels: %i\n", tmp);
snd_pcm_hw_params_get_rate(params, &tmp, 0);
printf("rate: %d \n", tmp);
//find size of period on hardware
snd_pcm_hw_params_get_period_size(params, &frames, 0);
fprintf(stderr, "# frames in a period: %d\n", frames);
//buffers on buffers (buffout for float output from sample rate conversion), (final for short array to write to pcm) and flangebse for the flanger stuff
buffout = malloc(frames*sfinf.channels * sizeof(float));//frames
final = malloc(frames*sfinf.channels * sizeof(short));//frames
bool AlsaLayer::alsa_set_params(snd_pcm_t *pcm_handle)
{
#define TRY(call, error) do { \
if (ALSA_CALL(call, error) < 0) \
return false; \
} while(0)
snd_pcm_hw_params_t *hwparams;
snd_pcm_hw_params_alloca(&hwparams);
const unsigned SFL_ALSA_PERIOD_SIZE = 160;
const unsigned SFL_ALSA_NB_PERIOD = 8;
const unsigned SFL_ALSA_BUFFER_SIZE = SFL_ALSA_PERIOD_SIZE * SFL_ALSA_NB_PERIOD;
snd_pcm_uframes_t period_size = SFL_ALSA_PERIOD_SIZE;
snd_pcm_uframes_t buffer_size = SFL_ALSA_BUFFER_SIZE;
unsigned int periods = SFL_ALSA_NB_PERIOD;
snd_pcm_uframes_t period_size_min = 0;
snd_pcm_uframes_t period_size_max = 0;
snd_pcm_uframes_t buffer_size_min = 0;
snd_pcm_uframes_t buffer_size_max = 0;
#define HW pcm_handle, hwparams /* hardware parameters */
TRY(snd_pcm_hw_params_any(HW), "hwparams init");
TRY(snd_pcm_hw_params_set_access(HW, SND_PCM_ACCESS_RW_INTERLEAVED), "access type");
TRY(snd_pcm_hw_params_set_format(HW, SND_PCM_FORMAT_S16_LE), "sample format");
TRY(snd_pcm_hw_params_set_rate_resample(HW, 0), "hardware sample rate"); /* prevent software resampling */
TRY(snd_pcm_hw_params_set_rate_near(HW, &audioFormat_.sample_rate, nullptr), "sample rate");
// TODO: use snd_pcm_query_chmaps or similar to get hardware channel num
audioFormat_.nb_channels = 2;
TRY(snd_pcm_hw_params_set_channels_near(HW, &audioFormat_.nb_channels), "channel count");
snd_pcm_hw_params_get_buffer_size_min(hwparams, &buffer_size_min);
snd_pcm_hw_params_get_buffer_size_max(hwparams, &buffer_size_max);
snd_pcm_hw_params_get_period_size_min(hwparams, &period_size_min, nullptr);
snd_pcm_hw_params_get_period_size_max(hwparams, &period_size_max, nullptr);
DEBUG("Buffer size range from %lu to %lu", buffer_size_min, buffer_size_max);
DEBUG("Period size range from %lu to %lu", period_size_min, period_size_max);
buffer_size = buffer_size > buffer_size_max ? buffer_size_max : buffer_size;
buffer_size = buffer_size < buffer_size_min ? buffer_size_min : buffer_size;
period_size = period_size > period_size_max ? period_size_max : period_size;
period_size = period_size < period_size_min ? period_size_min : period_size;
TRY(snd_pcm_hw_params_set_buffer_size_near(HW, &buffer_size), "Unable to set buffer size for playback");
TRY(snd_pcm_hw_params_set_period_size_near(HW, &period_size, nullptr), "Unable to set period size for playback");
TRY(snd_pcm_hw_params_set_periods_near(HW, &periods, nullptr), "Unable to set number of periods for playback");
TRY(snd_pcm_hw_params(HW), "hwparams");
snd_pcm_hw_params_get_buffer_size(hwparams, &buffer_size);
snd_pcm_hw_params_get_period_size(hwparams, &period_size, nullptr);
snd_pcm_hw_params_get_rate(hwparams, &audioFormat_.sample_rate, nullptr);
snd_pcm_hw_params_get_channels(hwparams, &audioFormat_.nb_channels);
DEBUG("Was set period_size = %lu", period_size);
DEBUG("Was set buffer_size = %lu", buffer_size);
if (2 * period_size > buffer_size) {
ERROR("buffer to small, could not use");
return false;
}
#undef HW
DEBUG("%s using format %s",
(snd_pcm_stream(pcm_handle) == SND_PCM_STREAM_PLAYBACK) ? "playback" : "capture",
audioFormat_.toString().c_str() );
snd_pcm_sw_params_t *swparams = NULL;
snd_pcm_sw_params_alloca(&swparams);
#define SW pcm_handle, swparams /* software parameters */
snd_pcm_sw_params_current(SW);
TRY(snd_pcm_sw_params_set_start_threshold(SW, period_size * 2), "start threshold");
TRY(snd_pcm_sw_params(SW), "sw parameters");
#undef SW
return true;
#undef TRY
}
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;
}
static int alsaio_setup(t_alsa_dev *dev, int out, int *channels, int *rate,
int nfrags, int frag_size)
{
int bufsizeforthis, err;
snd_pcm_hw_params_t* hw_params;
unsigned int tmp_uint;
snd_pcm_uframes_t tmp_snd_pcm_uframes;
if (sys_verbose)
{
if (out)
post("configuring sound output...");
else post("configuring sound input...");
}
/* set hardware parameters... */
snd_pcm_hw_params_alloca(&hw_params);
/* get the default params */
err = snd_pcm_hw_params_any(dev->a_handle, hw_params);
check_error(err, "snd_pcm_hw_params_any");
/* try to set interleaved access */
err = snd_pcm_hw_params_set_access(dev->a_handle,
hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
if (err < 0)
return (-1);
check_error(err, "snd_pcm_hw_params_set_access");
#if 0 /* enable this to print out which formats are available */
{
int i;
for (i = 0; i <= SND_PCM_FORMAT_LAST; i++)
fprintf(stderr, "%d -> %d\n",
i, snd_pcm_hw_params_test_format(dev->a_handle, hw_params, i));
}
#endif
/* Try to set 32 bit format first */
err = snd_pcm_hw_params_set_format(dev->a_handle,
hw_params, SND_PCM_FORMAT_S32);
if (err < 0)
{
/* fprintf(stderr,
"PD-ALSA: 32 bit format not available - trying 24\n"); */
err = snd_pcm_hw_params_set_format(dev->a_handle, hw_params,
SND_PCM_FORMAT_S24_3LE);
if (err < 0)
{
/* fprintf(stderr,
"PD-ALSA: 32/24 bit format not available - using 16\n"); */
err = snd_pcm_hw_params_set_format(dev->a_handle, hw_params,
SND_PCM_FORMAT_S16);
check_error(err, "snd_pcm_hw_params_set_format");
dev->a_sampwidth = 2;
}
else dev->a_sampwidth = 3;
}
else dev->a_sampwidth = 4;
if (sys_verbose)
post("Sample width set to %d bytes", dev->a_sampwidth);
/* set the subformat */
err = snd_pcm_hw_params_set_subformat(dev->a_handle,
hw_params, SND_PCM_SUBFORMAT_STD);
check_error(err, "snd_pcm_hw_params_set_subformat");
/* set the number of channels */
tmp_uint = *channels;
err = snd_pcm_hw_params_set_channels_min(dev->a_handle,
hw_params, &tmp_uint);
check_error(err, "snd_pcm_hw_params_set_channels");
if (tmp_uint != (unsigned)*channels)
post("ALSA: set %s channels to %d", (out?"output":"input"), tmp_uint);
*channels = tmp_uint;
dev->a_channels = *channels;
/* set the sampling rate */
err = snd_pcm_hw_params_set_rate_min(dev->a_handle, hw_params,
(unsigned int *)rate, 0);
check_error(err, "snd_pcm_hw_params_set_rate_min (input)");
#if 0
err = snd_pcm_hw_params_get_rate(hw_params, &subunitdir);
post("input sample rate %d", err);
#endif
/* post("frag size %d, nfrags %d", frag_size, nfrags); */
/* set "period size" */
#ifdef ALSAAPI9
err = snd_pcm_hw_params_set_period_size_near(dev->a_handle,
hw_params, (snd_pcm_uframes_t)frag_size, 0);
#else
tmp_snd_pcm_uframes = frag_size;
err = snd_pcm_hw_params_set_period_size_near(dev->a_handle,
hw_params, &tmp_snd_pcm_uframes, 0);
#endif
check_error(err, "snd_pcm_hw_params_set_period_size_near (input)");
/* set the buffer size */
#ifdef ALSAAPI9
err = snd_pcm_hw_params_set_buffer_size_near(dev->a_handle,
hw_params, nfrags * frag_size);
#else
tmp_snd_pcm_uframes = nfrags * frag_size;
err = snd_pcm_hw_params_set_buffer_size_near(dev->a_handle,
hw_params, &tmp_snd_pcm_uframes);
#endif
check_error(err, "snd_pcm_hw_params_set_buffer_size_near (input)");
err = snd_pcm_hw_params(dev->a_handle, hw_params);
check_error(err, "snd_pcm_hw_params (input)");
/* set up the buffer */
bufsizeforthis = DEFDACBLKSIZE * dev->a_sampwidth * *channels;
if (alsa_snd_buf)
{
if (alsa_snd_bufsize < bufsizeforthis)
{
if (!(alsa_snd_buf = realloc(alsa_snd_buf, bufsizeforthis)))
{
post("out of memory");
return (0);
}
memset(alsa_snd_buf, 0, bufsizeforthis);
alsa_snd_bufsize = bufsizeforthis;
}
}
else
{
if (!(alsa_snd_buf = (void *)malloc(bufsizeforthis)))
{
post("out of memory");
return (0);
}
memset(alsa_snd_buf, 0, bufsizeforthis);
alsa_snd_bufsize = bufsizeforthis;
}
return (1);
}
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;
}
int alsa_hook_hw_params(alsa_hook_t alsa_hook, snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
{
struct alsa_hook_stream_s *stream;
snd_pcm_format_t format;
snd_pcm_uframes_t period_size;
snd_pcm_access_t access;
int dir, ret;
alsa_hook_get_stream(alsa_hook, pcm, &stream);
if (unlikely((ret = alsa_hook_lock_write(alsa_hook, stream))))
return ret;
glc_log(alsa_hook->glc, GLC_DEBUG, "alsa_hook",
"%p: creating/updating configuration for stream %d",
stream->pcm, stream->id);
/* extract information */
if (unlikely((ret = snd_pcm_hw_params_get_format(params, &format)) < 0))
goto err;
stream->flags = 0; /* zero flags */
stream->format = pcm_fmt_to_glc_fmt(format);
if (unlikely(!stream->format)) {
glc_log(alsa_hook->glc, GLC_ERROR, "alsa_hook",
"%p: unsupported audio format 0x%02x", stream->pcm, format);
ret = ENOTSUP;
goto err;
}
if (unlikely((ret = snd_pcm_hw_params_get_rate(params, &stream->rate, &dir)) < 0))
goto err;
if (unlikely((ret = snd_pcm_hw_params_get_channels(params, &stream->channels)) < 0))
goto err;
if (unlikely((ret = snd_pcm_hw_params_get_period_size(params, &period_size, NULL)) < 0))
goto err;
if (unlikely((ret = snd_pcm_hw_params_get_access(params, &access)) < 0))
goto err;
if ((access == SND_PCM_ACCESS_RW_INTERLEAVED) ||
(access == SND_PCM_ACCESS_MMAP_INTERLEAVED))
stream->flags |= GLC_AUDIO_INTERLEAVED;
else if (access == SND_PCM_ACCESS_MMAP_COMPLEX) {
stream->flags |= GLC_AUDIO_INTERLEAVED; /* convert to interleaved */
stream->complex = 1; /* do conversion */
} else {
glc_log(alsa_hook->glc, GLC_ERROR, "alsa_hook",
"%p: unsupported access mode 0x%02x", stream->pcm, access);
ret = ENOTSUP;
goto err;
}
glc_log(alsa_hook->glc, GLC_DEBUG, "alsa_hook",
"%p: %d channels, rate %d, flags 0x%02x",
stream->pcm, stream->channels, stream->rate, stream->flags);
stream->fmt = 1;
if (alsa_hook->started) {
if (unlikely((ret = alsa_hook_stream_init(alsa_hook, stream))))
goto err;
}
alsa_hook_unlock_write(alsa_hook, stream);
return 0;
err:
glc_log(alsa_hook->glc, GLC_ERROR, "alsa_hook",
"%p: can't extract hardware configuration: %s (%d)",
stream->pcm, snd_strerror(ret), ret);
alsa_hook_unlock_write(alsa_hook, stream);
return ret;
}
int main(int argc, char ** argv) {
// Variable declaration
int rc;
char * buffer;
int buffer_size;
int periods_per_buffer;
snd_pcm_t *handle;
snd_pcm_hw_params_t *params;
snd_pcm_uframes_t frames;
unsigned int channels;
unsigned int rate;
wav_header * wav_header_info;
FILE * fp;
// Argument parsing
if (argc != 2)
{
printf("Incorrect usage: Enter filename of the wav file you want to play as an argument: %s filename.txt\n", argv[0]);
return 1;
}
// Open wav file to read
fp = fopen(argv[1], "rb");
if (fp == NULL)
{
printf("ERROR: %s does not exist, or cannot be opened.\n", argv[1]);
return 1;
}
wav_header_info = malloc(44);
fread(wav_header_info, 1, 44, fp);
// print_wav_header(wav_header_info);
// Assign variables that were read from the wave file
channels = wav_header_info->number_of_channels;
rate = wav_header_info->sample_rate;
periods_per_buffer = 2; // Down to user preference, depending on size of internal ring buffer of ALSA
// Open PCM device for playback
if ((rc = snd_pcm_open(&handle, "default", SND_PCM_STREAM_PLAYBACK, 0)) < 0)
{
printf("ERROR: Cannot open pcm device. %s\n", snd_strerror(rc));
}
// Allocate hardware parameters
if ((rc = snd_pcm_hw_params_malloc(¶ms)) < 0)
{
printf("ERROR: Cannot allocate hardware parameters. %s\n", snd_strerror(rc));
}
// Initialize parameters with default values
if ((rc = snd_pcm_hw_params_any(handle, params)) < 0)
{
printf("ERROR: Cannot initialize hardware parameters. %s\n", snd_strerror(rc));
}
// Setting hardware parameters
if ((rc = snd_pcm_hw_params_set_access(handle, params, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0)
{
printf("ERROR: Cannot set interleaved mode. %s\n", snd_strerror(rc));
}
if ((rc = snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_S16_LE)) < 0)
{
printf("ERROR: Cannot set PCM format. %s\n", snd_strerror(rc));
}
if ((rc = snd_pcm_hw_params_set_channels_near(handle, params, &channels)) < 0)
{
printf("ERROR: Cannot set number of channels. %s\n", snd_strerror(rc));
}
if ((rc = snd_pcm_hw_params_set_rate_near(handle, params, &rate, 0)) < 0)
{
printf("ERROR: Cannot set plyabck rate. %s\n", snd_strerror(rc));
}
if ((rc = snd_pcm_hw_params(handle, params)) < 0)
{
printf("ERROR: Cannot set hardware parameters. %s\n", snd_strerror(rc));
}
// Get hardware parameters
if ((rc = snd_pcm_hw_params_get_period_size(params, &frames, 0)) < 0)
{
printf("Playback ERROR: Can't get period size. %s\n", snd_strerror(rc));
}
printf("Frames: %lu\n", frames);
if ((rc = snd_pcm_hw_params_get_channels(params, &channels)) < 0)
{
printf("Playback ERROR: Can't get channel number. %s\n", snd_strerror(rc));
}
if ((rc = snd_pcm_hw_params_get_rate(params, &rate, 0)) < 0)
{
printf("ERROR: Cannot get rate. %s\n", snd_strerror(rc));
}
// Free paraemeters
snd_pcm_hw_params_free(params);
// Create buffer
buffer_size = frames * periods_per_buffer * channels * sizeof(int16_t); /* 2 bytes/sample, 2 channels */
buffer = (char *) malloc(buffer_size);
// Send info to ALSA
//while ((rc = read(0, buffer, buffer_size)) != 0)
while (rc = fread(buffer, 1, periods_per_buffer * frames * channels * sizeof(int16_t), fp) != 0)
{
rc = snd_pcm_writei(handle, buffer, frames * periods_per_buffer);
if (rc == -EPIPE)
{
fprintf(stderr, "underrun occurred\n");
snd_pcm_prepare(handle);
}
else if (rc < 0)
{
printf("ERROR: Cannot write to playback device. %s\n", strerror(rc));
}
}
printf("Info set: Device is now draining...\n");
snd_pcm_drain(handle);
printf("Done playing, closing connections.\n");
snd_pcm_close(handle);
free(wav_header_info);
free(buffer);
fclose(fp);
return 0;
}
static int
set_params(AudioDevice *ad, AudioFormat *format_p, int *ch_p, unsigned int *rate_p)
{
ALSA_data *alsa = (ALSA_data *)ad->private_data;
int r, err;
snd_pcm_format_t f;
AudioFormat format = *format_p;
snd_pcm_hw_params_t *hwparams;
snd_pcm_sw_params_t *swparams;
int ch = *ch_p;
unsigned int rate = *rate_p;
unsigned int buffer, period;
snd_pcm_hw_params_alloca(&hwparams);
snd_pcm_sw_params_alloca(&swparams);
ad->format = _AUDIO_FORMAT_UNSET;
*format_p = _AUDIO_FORMAT_UNSET;
*ch_p = 0;
*rate_p = 0;
/* format part */
switch (format) {
case _AUDIO_FORMAT_MU_LAW:
f = SND_PCM_FORMAT_MU_LAW;
break;
case _AUDIO_FORMAT_A_LAW:
f = SND_PCM_FORMAT_A_LAW;
break;
case _AUDIO_FORMAT_ADPCM:
f = SND_PCM_FORMAT_IMA_ADPCM;
break;
case _AUDIO_FORMAT_U8:
f = SND_PCM_FORMAT_U8;
break;
case _AUDIO_FORMAT_S8:
f = SND_PCM_FORMAT_S8;
break;
case _AUDIO_FORMAT_U16_LE:
f = SND_PCM_FORMAT_U16_LE;
break;
case _AUDIO_FORMAT_U16_BE:
f = SND_PCM_FORMAT_U16_BE;
break;
case _AUDIO_FORMAT_S16_LE:
f = SND_PCM_FORMAT_S16_LE;
break;
case _AUDIO_FORMAT_S16_BE:
f = SND_PCM_FORMAT_S16_BE;
break;
#if 0
case _AUDIO_FORMAT_S32_LE:
f = SND_PCM_FORMAT_U32_LE;
break;
case _AUDIO_FORMAT_S32_BE:
f = SND_PCM_FORMAT_S32_BE;
break;
#endif
default:
show_message_fnc("format %d is invalid.\n", format);
return 0;
}
if ((err = snd_pcm_hw_params_any(alsa->fd, hwparams)) < 0) {
show_message_fnc("snd_pcm_hw_params_any() failed.\n");
return 0;
}
if ((err = snd_pcm_hw_params_set_access(alsa->fd, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0) {
show_message_fnc("snd_pcm_hw_params_set_access() failed.\n");
return 0;
}
if ((err = snd_pcm_hw_params_set_format(alsa->fd, hwparams, f)) < 0) {
show_message_fnc("snd_pcm_hw_params_set_format() failed.\n");
return 0;
}
ad->format = format;
*format_p = format;
/* channel part */
if ((err = snd_pcm_hw_params_set_channels(alsa->fd, hwparams, ch)) < 0) {
show_message_fnc("snd_pcm_hw_params_set_channels() failed.\n");
return 0;
}
*ch_p = ch;
/* rate part */
if ((err = snd_pcm_hw_params_set_rate_near(alsa->fd, hwparams, &rate, 0)) < 0) {
show_message_fnc("snd_pcm_hw_params_set_rate_near() failed.\n");
return 0;
}
*rate_p = rate;
/* buffer & period */
buffer = 500000;
period = 500000 / 4;
if ((err = snd_pcm_hw_params_set_buffer_time_near(alsa->fd, hwparams, &buffer, 0)) < 0) {
show_message_fnc("snd_pcm_hw_params_set_buffer_near() failed.\n");
return 0;
}
r = snd_pcm_hw_params_get_buffer_size(hwparams, &alsa->buffer_size);
if ((err = snd_pcm_hw_params_set_period_time_near(alsa->fd, hwparams, &period, 0)) < 0) {
show_message_fnc("snd_pcm_hw_params_set_period_near() failed.\n");
return 0;
}
r = snd_pcm_hw_params_get_period_size(hwparams, &alsa->period_size, 0);
if ((err = snd_pcm_hw_params(alsa->fd, hwparams)) < 0) {
perror("snd_pcm_hw_params");
err_message_fnc("snd_pcm_hw_params() failed.\n");
snd_pcm_hw_params_dump(hwparams, alsa->log);
return 0;
}
r = snd_pcm_hw_params_get_channels(hwparams, &ad->channels);
r = snd_pcm_hw_params_get_rate(hwparams, &ad->speed, 0);
r = r; // dummy
#ifdef DEBUG
{
snd_pcm_format_t form;
debug_message_fnc("format ");
r = snd_pcm_hw_params_get_format(hwparams, &form);
switch (form) {
case SND_PCM_FORMAT_MU_LAW: debug_message("MU_LAW "); break;
case SND_PCM_FORMAT_A_LAW: debug_message("A_LAW "); break;
case SND_PCM_FORMAT_IMA_ADPCM: debug_message("ADPCM "); break;
case SND_PCM_FORMAT_U8: debug_message("U8 "); break;
case SND_PCM_FORMAT_S8: debug_message("S8 "); break;
case SND_PCM_FORMAT_U16_LE: debug_message("U16LE "); break;
case SND_PCM_FORMAT_U16_BE: debug_message("U16BE "); break;
case SND_PCM_FORMAT_S16_LE: debug_message("S16LE "); break;
case SND_PCM_FORMAT_S16_BE: debug_message("S16BE "); break;
#if 0
case SND_PCM_FORMAT_U32_LE: debug_message("U32LE "); break;
case SND_PCM_FORMAT_S32_BE: debug_message("S32BE "); break;
#endif
default: debug_message("UNKNOWN "); break;
}
debug_message("%d ch %d Hz buffer %ld period %ld OK\n", ad->channels, ad->speed, alsa->buffer_size, alsa->period_size);
}
#endif
/* sw_params */
if ((err = snd_pcm_sw_params_current(alsa->fd, swparams)) < 0) {
show_message_fnc("snd_pcm_sw_params_any() failed.\n");
return 0;
}
if ((err = snd_pcm_sw_params(alsa->fd, swparams)) < 0) {
show_message_fnc("snd_pcm_sw_params() failed.\n");
return 0;
}
debug_message_fnc("1 sample -> %ld bytes\n", snd_pcm_samples_to_bytes(alsa->fd, 1));
return 1;
}
int VPOutPluginAlsa::init(VPlayer *v, VPBuffer *in)
{
DBG("Alsa:init");
owner = v;
bin = in;
if (snd_pcm_open(&handle, "default", SND_PCM_STREAM_PLAYBACK, SND_PCM_NO_AUTO_RESAMPLE) < 0){
DBG("Alsa:init: failed to open pcm");
exit(0);
return -1;
}
snd_pcm_sw_params_t *swparams;
snd_pcm_sw_params_malloc(&swparams);
snd_pcm_sw_params_current (handle, swparams);
snd_pcm_sw_params_set_start_threshold (handle, swparams, VPBUFFER_FRAMES - PERIOD_SIZE);
snd_pcm_sw_params (handle, swparams);
snd_pcm_sw_params_free(swparams);
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_format_mask_t *mask;
snd_pcm_format_mask_alloca(&mask);
snd_pcm_hw_params_get_format_mask(params, mask);
if (snd_pcm_format_mask_test(mask, SND_PCM_FORMAT_S32))
{
DBG("bit depth is 32");
snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_S32);
multiplier = (1<<31) -1 ;
DBG(multiplier);
}
else if (snd_pcm_format_mask_test(mask, SND_PCM_FORMAT_S24))
{
DBG("bit depth is 24");
snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_S24);
multiplier = (1<<23) -1;
}
else if (snd_pcm_format_mask_test(mask, SND_PCM_FORMAT_S16))
{
DBG("bit depth is 16");
snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_S16);
multiplier = (1<<15) -1;
}
else if (snd_pcm_format_mask_test(mask, SND_PCM_FORMAT_S8))
{
DBG("bit depth is 8");
snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_S8);
multiplier = (1<<7) -1;;
}
snd_pcm_hw_params_set_channels(handle, params, bin->chans);
snd_pcm_hw_params_set_period_size(handle, params, PERIOD_SIZE, 0);
if (snd_pcm_hw_params(handle, params) < 0) {
DBG("Alsa:init: failed to set pcm params");
return -1;
}
snd_pcm_hw_params_current(handle, params);
int dir;
snd_pcm_hw_params_get_rate(params, &out_srate, &dir);
in_srate = bin->srate;
int rerr;
rs = src_new(SRC_SINC_FASTEST, bin->chans, &rerr);
if (!rs){
DBG("SRC error"<<rerr);
return -1;
}
rd.src_ratio = (out_srate*1.0)/(in_srate*1.0);
out_frames = (VPBUFFER_FRAMES*rd.src_ratio)*2;
out_buf = (float *)ALIGNED_ALLOC(sizeof(float)*out_frames*bin->chans);
out_buf_i = (int *)ALIGNED_ALLOC(sizeof(int)*out_frames*bin->chans);
DBG("target rate "<<out_srate);
work = true;
paused = false;
pause_check = false;
FULL_MEMORY_BARRIER;
in_fd = inotify_init();
if ( in_fd < 0 ) {
DBG("error initializing inotify, auto pause won't work");
} else {
in_wd[0]=inotify_add_watch( in_fd, "/dev/snd/pcmC0D0p", IN_OPEN | IN_CLOSE );
}
fcntl(in_fd, F_SETFL, O_NONBLOCK);
worker = new std::thread((void(*)(void*))worker_run, this);
worker->high_priority();
DBG("alsa thread made");
DBG((void *)VPOutPluginAlsa::check_contention);
VPEvents::getSingleton()->schedulerAddJob((VPEvents::VPJob) VPOutPluginAlsa::check_contention, this,0);
return 0;
}
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 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;
}
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;
}
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;
}
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;
}
static int bluetooth_a2dp_init(struct bluetooth_data *data,
snd_pcm_hw_params_t *params)
{
struct bluetooth_alsa_config *cfg = &data->alsa_config;
sbc_capabilities_t *cap = &data->a2dp.sbc_capabilities;
unsigned int max_bitpool, min_bitpool, rate, channels;
int dir;
snd_pcm_hw_params_get_rate(params, &rate, &dir);
snd_pcm_hw_params_get_channels(params, &channels);
switch (rate) {
case 48000:
cap->frequency = BT_SBC_SAMPLING_FREQ_48000;
break;
case 44100:
cap->frequency = BT_SBC_SAMPLING_FREQ_44100;
break;
case 32000:
cap->frequency = BT_SBC_SAMPLING_FREQ_32000;
break;
case 16000:
cap->frequency = BT_SBC_SAMPLING_FREQ_16000;
break;
default:
DBG("Rate %d not supported", rate);
return -1;
}
if (cfg->has_channel_mode)
cap->channel_mode = cfg->channel_mode;
else if (channels == 2) {
if (cap->channel_mode & BT_A2DP_CHANNEL_MODE_JOINT_STEREO)
cap->channel_mode = BT_A2DP_CHANNEL_MODE_JOINT_STEREO;
else if (cap->channel_mode & BT_A2DP_CHANNEL_MODE_STEREO)
cap->channel_mode = BT_A2DP_CHANNEL_MODE_STEREO;
else if (cap->channel_mode & BT_A2DP_CHANNEL_MODE_DUAL_CHANNEL)
cap->channel_mode = BT_A2DP_CHANNEL_MODE_DUAL_CHANNEL;
} else {
if (cap->channel_mode & BT_A2DP_CHANNEL_MODE_MONO)
cap->channel_mode = BT_A2DP_CHANNEL_MODE_MONO;
}
if (!cap->channel_mode) {
DBG("No supported channel modes");
return -1;
}
if (cfg->has_block_length)
cap->block_length = cfg->block_length;
else if (cap->block_length & BT_A2DP_BLOCK_LENGTH_16)
cap->block_length = BT_A2DP_BLOCK_LENGTH_16;
else if (cap->block_length & BT_A2DP_BLOCK_LENGTH_12)
cap->block_length = BT_A2DP_BLOCK_LENGTH_12;
else if (cap->block_length & BT_A2DP_BLOCK_LENGTH_8)
cap->block_length = BT_A2DP_BLOCK_LENGTH_8;
else if (cap->block_length & BT_A2DP_BLOCK_LENGTH_4)
cap->block_length = BT_A2DP_BLOCK_LENGTH_4;
else {
DBG("No supported block lengths");
return -1;
}
if (cfg->has_subbands)
cap->subbands = cfg->subbands;
if (cap->subbands & BT_A2DP_SUBBANDS_8)
cap->subbands = BT_A2DP_SUBBANDS_8;
else if (cap->subbands & BT_A2DP_SUBBANDS_4)
cap->subbands = BT_A2DP_SUBBANDS_4;
else {
DBG("No supported subbands");
return -1;
}
if (cfg->has_allocation_method)
cap->allocation_method = cfg->allocation_method;
if (cap->allocation_method & BT_A2DP_ALLOCATION_LOUDNESS)
cap->allocation_method = BT_A2DP_ALLOCATION_LOUDNESS;
else if (cap->allocation_method & BT_A2DP_ALLOCATION_SNR)
cap->allocation_method = BT_A2DP_ALLOCATION_SNR;
if (cfg->has_bitpool)
min_bitpool = max_bitpool = cfg->bitpool;
else {
min_bitpool = MAX(MIN_BITPOOL, cap->min_bitpool);
max_bitpool = MIN(default_bitpool(cap->frequency,
cap->channel_mode),
cap->max_bitpool);
}
cap->min_bitpool = min_bitpool;
cap->max_bitpool = max_bitpool;
return 0;
}
pcm_player *pcm_player_init(int framerate, int nchannels, int sampwidth)
{
pcm_player *player;
int retval, format, buffsz;
char *buff, *devname;
snd_pcm_t *pcm_handle;
snd_pcm_stream_t stream;
snd_pcm_hw_params_t *hwparams;
snd_pcm_uframes_t periodsize;
// check parameters
if(nchannels != 1 && nchannels != 2) {
fprintf(stderr, "error: unsupported channels: %d\n", nchannels);
return NULL;
}
if(sampwidth == 1)
format = SND_PCM_FORMAT_U8;
else if(sampwidth == 2)
format = SND_PCM_FORMAT_S16_LE;
else if(sampwidth == 3)
format = SND_PCM_FORMAT_S24_LE;
else if(sampwidth == 4)
format = SND_PCM_FORMAT_S32_LE;
else {
fprintf(stderr, "error: unsupported sample width: %d\n", sampwidth);
return NULL;
}
// allocate the structure
player = (pcm_player*)malloc(sizeof(pcm_player));
if(player == NULL)
return NULL;
// open the PCM device in playback mode
devname = "default";
stream = SND_PCM_STREAM_PLAYBACK;
if((retval = snd_pcm_open(&pcm_handle, devname, stream, 0)) < 0) {
fprintf(stderr, "error: can't PCM device: %s\n", snd_strerror(retval));
free(player);
return NULL;
}
// allocate parameters object and fill it with default values
snd_pcm_hw_params_alloca(&hwparams);
snd_pcm_hw_params_any(pcm_handle, hwparams);
// set parameters
if((retval = snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0) {
fprintf(stderr, "error: can't set interleaved mode: %s\n", snd_strerror(retval));
snd_pcm_close(pcm_handle);
free(player);
return NULL;
}
if ((retval = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format)) < 0) {
fprintf(stderr, "error: can't set format: %s\n", snd_strerror(retval));
snd_pcm_close(pcm_handle);
free(player);
return NULL;
}
if ((retval = snd_pcm_hw_params_set_channels(pcm_handle, hwparams, nchannels)) < 0) {
fprintf(stderr, "error: can't set channels: %s\n", snd_strerror(retval));
snd_pcm_close(pcm_handle);
free(player);
return NULL;
}
if ((retval = snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, &framerate, 0)) < 0) {
fprintf(stderr, "error: can't set rate: %s\n", snd_strerror(retval));
snd_pcm_close(pcm_handle);
free(player);
return NULL;
}
periodsize = framerate / 10;
if((retval = snd_pcm_hw_params_set_period_size(pcm_handle, hwparams, periodsize, 0)) < 0) {
fprintf(stderr, "error: can't set period size: %s\n", snd_strerror(retval));
snd_pcm_close(pcm_handle);
free(player);
return NULL;
}
// write parameters
if ((retval = snd_pcm_hw_params(pcm_handle, hwparams)) < 0) {
fprintf(stderr, "error: can't set hardware parameters: %s\n", snd_strerror(retval));
snd_pcm_close(pcm_handle);
free(player);
return NULL;
}
// resume information
printf("PCM name: %s\n", snd_pcm_name(pcm_handle));
snd_pcm_hw_params_get_channels(hwparams, &nchannels);
printf("channels: %i ", nchannels);
if (nchannels == 1)
printf("(mono)\n");
else if (nchannels == 2)
printf("(stereo)\n");
snd_pcm_hw_params_get_rate(hwparams, &framerate, 0);
printf("framerate: %d Hz\n", framerate);
// allocate buffer to hold single period
snd_pcm_hw_params_get_period_size(hwparams, &periodsize, 0);
printf("period size: %d\n", periodsize);
buffsz = sampwidth * nchannels * periodsize;
printf("buffer size: %d\n", buffsz);
buff = (char*)malloc(buffsz);
if(buff == NULL) {
fprintf(stderr, "error: can't allocate pcm buffer\n");
snd_pcm_close(pcm_handle);
free(player);
return NULL;
}
// set player attributes
player->pcm_handle = pcm_handle;
player->framerate = framerate;
player->nchannels = nchannels;
player->sampwidth = sampwidth;
player->periodsize = periodsize;
player->buffersize = buffsz;
player->buffer = buff;
return player;
}
static int
alsa_audio_reconfig(audio_decoder_t *ad)
{
decoder_t *d = (decoder_t *)ad;
snd_pcm_t *h;
int r;
alsa_audio_fini(ad);
if(d->h != NULL) {
snd_pcm_close(d->h);
d->h = NULL;
TRACE(TRACE_DEBUG, "ALSA", "Closing device");
}
const char *dev = alsa_get_devicename();
if((r = snd_pcm_open(&h, dev, SND_PCM_STREAM_PLAYBACK, 0) < 0)) {
TRACE(TRACE_ERROR, "ALSA", "Unable to open %s -- %s",
dev, snd_strerror(r));
return -1;
}
r = snd_pcm_set_params(h, SND_PCM_FORMAT_S16, SND_PCM_ACCESS_RW_INTERLEAVED,
2, 48000, 0, 100000);
if(r < 0) {
TRACE(TRACE_ERROR, "ALSA", "Unable to set params on %s -- %s",
dev, snd_strerror(r));
return -1;
}
snd_pcm_hw_params_t *hwp;
snd_pcm_hw_params_alloca(&hwp);
snd_pcm_hw_params_current(h, hwp);
unsigned int val;
snd_pcm_uframes_t psize, bsize;
snd_pcm_hw_params_get_rate(hwp, &val, 0);
ad->ad_out_sample_rate = val;
snd_pcm_hw_params_get_period_size(hwp, &psize, 0);
ad->ad_tile_size = psize * 2;
snd_pcm_hw_params_get_buffer_size(hwp, &bsize);
d->max_frames_per_write = bsize;
TRACE(TRACE_DEBUG, "ALSA", "Opened %s", dev);
ad->ad_out_sample_format = AV_SAMPLE_FMT_S16;
ad->ad_out_sample_rate = 48000;
ad->ad_out_channel_layout = AV_CH_LAYOUT_STEREO;
d->h = h;
snd_pcm_prepare(d->h);
int channels = 2;
d->tmp = malloc(sizeof(uint16_t) * channels * d->max_frames_per_write);
return 0;
}
