static snd_pcm_sframes_t snd_pcm_file_writen(snd_pcm_t *pcm, void **bufs, snd_pcm_uframes_t size)
{
snd_pcm_file_t *file = pcm->private_data;
snd_pcm_channel_area_t areas[pcm->channels];
snd_pcm_sframes_t n = snd_pcm_writen(file->gen.slave, bufs, size);
if (n > 0) {
snd_pcm_areas_from_bufs(pcm, areas, bufs);
snd_pcm_file_add_frames(pcm, areas, 0, n);
}
return n;
}
int SoundThread::playback_callback (snd_pcm_sframes_t nframes)
{
int err;
//printf ("playback callback called with %d frames\n", (int)nframes);
void *channelsbuffer[1];
channelsbuffer[0] = &samplebuffer;
sndFIFO->read(samplebuffer, nframes);
if ((err = snd_pcm_writen(playback_handle, (void **)channelsbuffer, nframes)) < 0)
{
fprintf (stderr, "write failed (%s)\n", snd_strerror (err));
}
return err;
}
TErrors SalsaStream::write(llaAudioPipe& buffer) {
if(pcm_state_ == CLOSED) {
LOGGER().warning(E_WRITE_STREAM, "Attempt to write to a closed stream.");
return E_WRITE_STREAM;
}
TErrors err;
if( (err = updateSettings(buffer)) != E_OK) return err;
buffer.onSamplesReady();
if(buffer.fail()) {
return E_WRITE_STREAM;
}
char *iraw, **niraw;
int rc;
getRawOutputBuffers(buffer, &iraw, &niraw);
TSize frames_to_deliver = getBufferLastWrite(buffer);
if( frames_to_deliver <= 0 || frames_to_deliver > buffer_size_)
frames_to_deliver = buffer.getBufferLength();
if(organization_ == SND_PCM_ACCESS_RW_NONINTERLEAVED) {
rc = snd_pcm_writen(pcm_, (void**)niraw, frames_to_deliver);
}
else {
rc = snd_pcm_writei(pcm_, (void*)iraw, frames_to_deliver);
}
if (rc == -EPIPE) {
/* EPIPE means underrun */
snd_pcm_prepare(pcm_);
} else if (rc < 0) {
LOGGER().warning(E_WRITE_STREAM, snd_strerror(rc));
snd_pcm_recover(pcm_, rc, 0);
return E_WRITE_STREAM;
}
return E_OK;
}
//==============================================================================
bool writeToOutputDevice (AudioBuffer<float>& outputChannelBuffer, const int numSamples)
{
jassert (numChannelsRunning <= outputChannelBuffer.getNumChannels());
float* const* const data = outputChannelBuffer.getArrayOfWritePointers();
snd_pcm_sframes_t numDone = 0;
if (isInterleaved)
{
scratch.ensureSize ((size_t) ((int) sizeof (float) * numSamples * numChannelsRunning), false);
for (int i = 0; i < numChannelsRunning; ++i)
converter->convertSamples (scratch.getData(), i, data[i], 0, numSamples);
numDone = snd_pcm_writei (handle, scratch.getData(), (snd_pcm_uframes_t) numSamples);
}
else
{
for (int i = 0; i < numChannelsRunning; ++i)
converter->convertSamples (data[i], data[i], numSamples);
numDone = snd_pcm_writen (handle, (void**) data, (snd_pcm_uframes_t) numSamples);
}
if (numDone < 0)
{
if (numDone == -(EPIPE))
underrunCount++;
if (JUCE_ALSA_FAILED (snd_pcm_recover (handle, (int) numDone, 1 /* silent */)))
return false;
}
if (numDone < numSamples)
JUCE_ALSA_LOG ("Did not write all samples: numDone: " << numDone << ", numSamples: " << numSamples);
return true;
}
//==============================================================================
bool writeToOutputDevice (AudioSampleBuffer& outputChannelBuffer, const int numSamples)
{
jassert (numChannelsRunning <= outputChannelBuffer.getNumChannels());
float** const data = outputChannelBuffer.getArrayOfChannels();
snd_pcm_sframes_t numDone = 0;
if (isInterleaved)
{
scratch.ensureSize (sizeof (float) * numSamples * numChannelsRunning, false);
for (int i = 0; i < numChannelsRunning; ++i)
converter->convertSamples (scratch.getData(), i, data[i], 0, numSamples);
numDone = snd_pcm_writei (handle, scratch.getData(), numSamples);
}
else
{
for (int i = 0; i < numChannelsRunning; ++i)
converter->convertSamples (data[i], data[i], numSamples);
numDone = snd_pcm_writen (handle, (void**) data, numSamples);
}
if (failed (numDone))
{
if (numDone == -EPIPE)
{
if (failed (snd_pcm_prepare (handle)))
return false;
}
else if (numDone != -ESTRPIPE)
return false;
}
return true;
}
snd_pcm_sframes_t snd_pcm_generic_writen(snd_pcm_t *pcm, void **bufs, snd_pcm_uframes_t size)
{
snd_pcm_generic_t *generic = pcm->private_data;
return snd_pcm_writen(generic->slave, bufs, size);
}
int alsa_play_play(alsa_play_t alsa_play, glc_audio_data_header_t *audio_hdr, char *data)
{
snd_pcm_uframes_t frames, rem;
snd_pcm_sframes_t ret = 0;
unsigned int c;
if (audio_hdr->id != alsa_play->id)
return 0;
if (!alsa_play->pcm) {
glc_log(alsa_play->glc, GLC_ERROR, "alsa_play", "broken stream %d",
alsa_play->id);
return EINVAL;
}
frames = snd_pcm_bytes_to_frames(alsa_play->pcm, audio_hdr->size);
glc_utime_t time = glc_state_time(alsa_play->glc);
glc_utime_t duration = ((glc_utime_t) 1000000000 * (glc_utime_t) frames) /
(glc_utime_t) alsa_play->rate;
if (time + alsa_play->silence_threshold + duration < audio_hdr->time) {
struct timespec ts = {
.tv_sec = (audio_hdr->time - time - duration - alsa_play->silence_threshold)/1000000000,
.tv_nsec = (audio_hdr->time - time - duration - alsa_play->silence_threshold)%1000000000 };
nanosleep(&ts,NULL);
}
/*
* This condition determine what will be the initial audio packet.
* it is preferable to be ahead by < duration/2 than behind
* the video by > duration/2
*/
else if (time > audio_hdr->time + duration/2) {
glc_log(alsa_play->glc, GLC_DEBUG, "alsa_play",
"dropped packet. now %" PRId64 " ts %" PRId64,
time, audio_hdr->time);
return 0;
}
rem = frames;
while (rem > 0) {
/* alsa is horrible... */
/*snd_pcm_wait(alsa_play->pcm, duration);*/
if (alsa_play->flags & GLC_AUDIO_INTERLEAVED)
ret = snd_pcm_writei(alsa_play->pcm,
&data[snd_pcm_frames_to_bytes(alsa_play->pcm, frames - rem)],
rem);
else {
for (c = 0; c < alsa_play->channels; c++)
alsa_play->bufs[c] =
&data[snd_pcm_samples_to_bytes(alsa_play->pcm, frames)
* c + snd_pcm_samples_to_bytes(alsa_play->pcm, frames - rem)];
ret = snd_pcm_writen(alsa_play->pcm, alsa_play->bufs, rem);
}
if (ret == 0)
break;
if ((ret == -EBUSY) || (ret == -EAGAIN))
break;
else if (ret < 0) {
if ((ret = alsa_play_xrun(alsa_play, ret))) {
glc_log(alsa_play->glc, GLC_ERROR, "alsa_play",
"xrun recovery failed: %s", snd_strerror(-ret));
return ret;
}
} else
rem -= ret;
}
return 0;
}
int main(void)
{
/* Handle for the PCM device */
snd_pcm_t *pcm_handle = NULL;
/* Playback stream */
snd_pcm_stream_t stream = SND_PCM_STREAM_PLAYBACK;
/* This structure contains information about
* the hardware and can be used to specify the
* configuration to be used for the PCM stream.
*/
snd_pcm_hw_params_t *hwparams;
/* Name of the PCM device, like plughw:0,0
* The first number is the number of the soundcard,
* the second number is the number ot the device.
*/
char * pcm_name;
/* Init pcm_name. Of course, later you
* will make this configurable;
*/
pcm_name = strdup("plughw:0,0");
/* Allocate the snd_pcm_hw_params_t structure on the stack.*/
snd_pcm_hw_params_alloca(&hwparams);
/* Open PCM. the last parameter of this function is the mode.
* If this is set to 0, the standard mode is used. Possible
* other values are SND_PCM_NONBLOCK AND SND_PCM_ASYNC.
* if SND_PCM_NONBLOCK is used, read/write access to the
* PCM device will return immediately. If SND_PCM_ASYNC is
* specified. SIGIO will be emitted whenever a period has
* been completely processed by the soundcard.
*/
if(snd_pcm_open(&pcm_handle, pcm_name, stream, 0) < 0){
fprintf(stderr, "Error opening PCM device %s\n", pcm_name);
return (-1);
}
/* Init hwparams with full configuration space */
if(snd_pcm_hw_params_any(pcm_handle, hwparams) < 0){
fprintf(stderr, "Can not configure this PCM device.\n");
return (-1);
}
int rate = 44100; /* Sample rate */
int exact_rate; /* Sample rate returned by snd_pcm_hw_params_set_rate_near */
int dir; /* exact_rate == rate --> dir = 0 */
/* exact_rate < rate --> dir = -1 */
/* exact_rate > rate --> dir = 1 */
int periods = 2; /* Number of periods */
snd_pcm_uframes_t periodsize = 8192; /* Periodsize (bytes) */
/* Set access type. This can be either
* SND_PCM_ACCESS_RW_INTERLEAVED or
* SND_PCM_ACCESS_MMAP_NONINTERLEAVED.
* There are also access types for MMAPed
* access, but this is beyond the scope
* of this introduction.
*/
if(snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED) < 0){
fprintf(stderr, "Error setting access.\n");
return (-1);
}
/* Set sample format */
if(snd_pcm_hw_params_set_format(pcm_handle, hwparams, SND_PCM_FORMAT_S16_LE) < 0){
fprintf(stderr, "Error setting format.\n");
return (-1);
}
/* Set sample rate. If the exact rate is not supported by the hardware, use nearest possbile rate. */
exact_rate = rate;
if(snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, &exact_rate, 0) < 0){
fprintf(stderr, "Error setting rate.\n");
return (-1);
}
if(rate != exact_rate){
fprintf(stderr, "The rate %d HZ is not supported by your hardware.\n ==> Using %d HZ instead.\n", rate, exact_rate);
}
/* Set number of channels */
if(snd_pcm_hw_params_set_channels(pcm_handle, hwparams, 2) < 0){
fprintf(stderr, "Error setting channels. \n");
return (-1);
}
/* Set number of periods. Periods used to be called fragments. */
if(snd_pcm_hw_params_set_periods(pcm_handle, hwparams, periods, 0) < 0){
fprintf(stderr, "Error setting periods.\n");
return (-1);
}
/* Set buffer size (in frames). The resulting latency is given by
* latency = periodsize * periods / (rate * bytes_per_frame)
*/
if(snd_pcm_hw_params_set_buffer_size(pcm_handle, hwparams, (periodsize * periods) >> 2) < 0){
fprintf(stderr, "Error setting buffersize.\n");
return (-1);
}
/* Apply HW parameter settins to
* PCM device and prepare device
*/
if(snd_pcm_hw_params(pcm_handle, hwparams) < 0){
fprintf(stderr, "Error setting HW params. \n");
return (-1);
}
#if 0
/* Write num_frames frames from buffer data to
* the PCM device pointed to by pcm_handle.
* Returns the number of frames actually written.
*/
snd_pcm_sframes_t snd_pcm_writei(pcm_handle, data, num_frames);
#endif
#if 0
/*Write num_frames frames from buffer data to
* the PCM device pointed to by pcm_handle.
* Returns the number of frames actually written.
*/
snd_pcm_sframes_t snd_pcm_writen(pcm_handle, data, num_frames);
#endif
unsigned char *data;
int pcmreturn, l1, l2;
short s1, s2;
int frames;
int num_frames = 1024;
data = (unsigned char *)malloc(periodsize);
frames = periodsize >> 2;
for(l1 = 0; l1 < 100; l1++){
for(l2 = 0; l2 < num_frames; l2++){
s1 = (l2 % 128) * 100 - 5000;
s2 = (l2 % 256) * 100 - 5000;
data[4*l2] = (unsigned char)s1;
data[4*l2+1] = s1 >> 8;
data[4*l2+2] = (unsigned char)s2;
data[4*l2+3] = s2 >> 8;
}
while((pcmreturn = snd_pcm_writei(pcm_handle, data, frames)) < 0){
snd_pcm_prepare(pcm_handle);
fprintf(stderr, "<<<<<<<<<<<< Buffer Underrun >>>>>>>>>>>>");
}
}
/* Stop PCM device and drop pending frames */
snd_pcm_drop(pcm_handle);
/* Stop PCM device after pending frames have been played */
snd_pcm_drain(pcm_handle);
return 0;
}
int playback_file(unsigned rate, uint16_t channels, int fd, uint32_t total_count)
{
int rc;
int size;
uint32_t left_size;
snd_pcm_t *handle;
snd_pcm_hw_params_t *params;
#ifdef INTEL
int dir;
#endif
snd_pcm_uframes_t frames;
char *buffer; /* TODO */
/* Allocate a hardware parameters object. */
rc = snd_pcm_hw_params_malloc(¶ms);
if (rc < 0)
{
fprintf(stderr, "snd_pcm_hw_params_malloc: %s\n", snd_strerror(rc));
exit(1);
}
/* Open PCM device for playbacking. */
rc = snd_pcm_open(&handle, "default", SND_PCM_STREAM_PLAYBACK, 0);
//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);
}
/* Fill it in with default values. */
rc = snd_pcm_hw_params_any(handle, params);
if (rc < 0)
{
fprintf(stderr, "snd_pcm_hw_params_any: %s\n", snd_strerror(rc));
return 1;
}
/* Set the desired hardware parameters. */
/* Interleaved mode */
#ifdef INTERLEAVED
rc = snd_pcm_hw_params_set_access(handle, params, SND_PCM_ACCESS_RW_INTERLEAVED);
#else
rc = snd_pcm_hw_params_set_access(handle, params, SND_PCM_ACCESS_RW_NONINTERLEAVED);
#endif
if (rc < 0)
{
fprintf(stderr, "snd_pcm_hw_params_set_access: %d %s\n", rc, snd_strerror(rc));
//return 1;
}
/* 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, channels);
/* 44100 bits/second sampling rate (CD quality) */
#ifdef INTEL
snd_pcm_hw_params_set_rate_near(handle, params, &rate, &dir);
#else
snd_pcm_hw_params_set_rate_near(handle, params, &rate, 0);
#endif
/* Set period size to 32 frames. */
frames = 32;
#ifdef INTEL
snd_pcm_hw_params_set_period_size_near(handle, params, &frames, &dir);
#else
snd_pcm_hw_params_set_period_size_near(handle, params, &frames, 0);
#endif
/* 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 */
#ifdef INTEL
snd_pcm_hw_params_get_period_size(params, &frames, &dir);
#else
snd_pcm_hw_params_get_period_size(params, &frames, 0);
#endif
fprintf(stderr, "get period size: %d\n", frames);
size = frames * 16 / 8 * channels; /* 2 bytes/sample(16bit), 2 channels */
buffer = (char *) malloc(size);
// while (left_size > 0) {
while (1) {
rc = read(fd, buffer, size);
if(rc <= 0) {
printf("at the end of file, exiting...\n");
break;
}
totle_size += rc; /* totle data size */
left_size = total_count - totle_size;
if (rc != size)
fprintf(stderr, "short read: read %d bytes\n", rc);
#ifdef INTERLEAVED
rc = snd_pcm_writei(handle, buffer, frames);
#else
void* Data[2];
Data[0] = (void*)buffer;
Data[1] = (void*)buffer;
rc = snd_pcm_writen(handle, Data, frames);
#endif
if (rc == -EPIPE) {
/* EPIPE means overrun */
fprintf(stderr, "overrun occurred\n");
snd_pcm_prepare(handle);
} else if (rc < 0) {
fprintf(stderr, "error from write: %s\n", snd_strerror(rc));
} else if (rc != (int)frames) {
fprintf(stderr, "short write, write %d frames\n", rc);
}
if(left_size <= 0){
lseek(fd, sizeof(hdr), SEEK_SET);
totle_size = 0;
printf("again \n");
// read(fd, &hdr, sizeof(hdr));
}
}
fprintf(stderr, "closing device \n");
snd_pcm_drop(handle);
fprintf(stderr, "4 \n");
snd_pcm_drain(handle);
fprintf(stderr, "3 \n");
snd_pcm_close(handle);
fprintf(stderr, "2 \n");
if(params)
{
snd_pcm_hw_params_free(params);
}
fprintf(stderr, "1 \n");
free(buffer);
fprintf(stderr, "exit \n");
return 0;
}