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#ifndef AUDIOGRAPHER_TMP_FILE_RT_H
#define AUDIOGRAPHER_TMP_FILE_RT_H
#include <cstdio>
#include <string>
#include <glib.h>
#include "pbd/gstdio_compat.h"
#include "pbd/ringbuffer.h"
#include "audiographer/flag_debuggable.h"
#include "audiographer/sink.h"
#include "sndfile_writer.h"
#include "sndfile_reader.h"
#include "tmp_file.h"
namespace AudioGrapher
{
static const samplecnt_t rb_chunksize = 8192; // samples
/** A temporary file deleted after this class is destructed
* with realtime safe background thread writer.
*/
template<typename T = DefaultSampleType>
class TmpFileRt
: public TmpFile<T>
{
public:
/// \a filename_template must match the requirements for mkstemp, i.e. end in "XXXXXX"
TmpFileRt (char * filename_template, int format, ChannelCount channels, samplecnt_t samplerate)
: SndfileHandle (g_mkstemp(filename_template), true, SndfileBase::ReadWrite, format, channels, samplerate)
, filename (filename_template)
, _chunksize (rb_chunksize * channels)
, _rb (std::max (_chunksize * 16, 5 * samplerate * channels))
{
init ();
}
using SndfileHandle::operator=;
~TmpFileRt()
{
end_write ();
/* explicitly close first, some OS (yes I'm looking at you windows)
* cannot delete files that are still open
*/
if (!filename.empty()) {
SndfileBase::close();
std::remove(filename.c_str());
}
pthread_mutex_destroy (&_disk_thread_lock);
pthread_cond_destroy (&_data_ready);
}
/// Writes data to file
void process (ProcessContext<T> const & c)
{
SndfileWriter<T>::check_flags (*this, c);
if (SndfileWriter<T>::throw_level (ThrowStrict) && c.channels() != SndfileHandle::channels()) {
throw Exception (*this, boost::str (boost::format
("Wrong number of channels given to process(), %1% instead of %2%")
% c.channels() % SndfileHandle::channels()));
}
if (SndfileWriter<T>::throw_level (ThrowProcess) && _rb.write_space() < c.samples()) {
throw Exception (*this, boost::str (boost::format
("Could not write data to ringbuffer/output file (%1%)")
% SndfileHandle::strError()));
}
_rb.write (c.data(), c.samples());
if (c.has_flag(ProcessContext<T>::EndOfInput)) {
_capture = false;
SndfileWriter<T>::FileWritten (filename);
}
if (pthread_mutex_trylock (&_disk_thread_lock) == 0) {
pthread_cond_signal (&_data_ready);
pthread_mutex_unlock (&_disk_thread_lock);
}
}
using Sink<T>::process;
void disk_thread ()
{
T *framebuf = (T*) malloc (_chunksize * sizeof (T));
pthread_mutex_lock (&_disk_thread_lock);
while (_capture) {
if ((samplecnt_t)_rb.read_space () >= _chunksize) {
_rb.read (framebuf, _chunksize);
samplecnt_t const written = SndfileBase::write (framebuf, _chunksize);
assert (written == _chunksize);
SndfileWriter<T>::samples_written += written;
}
if (!_capture) {
break;
}
pthread_cond_wait (&_data_ready, &_disk_thread_lock);
}
// flush ringbuffer
while (_rb.read_space () > 0) {
size_t remain = std::min ((samplecnt_t)_rb.read_space (), _chunksize);
_rb.read (framebuf, remain);
samplecnt_t const written = SndfileBase::write (framebuf, remain);
SndfileWriter<T>::samples_written += written;
}
SndfileWriter<T>::writeSync();
pthread_mutex_unlock (&_disk_thread_lock);
free (framebuf);
TmpFile<T>::FileFlushed ();
}
protected:
std::string filename;
bool _capture;
samplecnt_t _chunksize;
PBD::RingBuffer<T> _rb;
pthread_mutex_t _disk_thread_lock;
pthread_cond_t _data_ready;
pthread_t _thread_id;
static void * _disk_thread (void *arg)
{
TmpFileRt *d = static_cast<TmpFileRt *>(arg);
d->disk_thread ();
pthread_exit (0);
return 0;
}
void end_write () {
pthread_mutex_lock (&_disk_thread_lock);
_capture = false;
pthread_cond_signal (&_data_ready);
pthread_mutex_unlock (&_disk_thread_lock);
pthread_join (_thread_id, NULL);
}
void init()
{
SndfileWriter<T>::samples_written = 0;
_capture = true;
SndfileWriter<T>::add_supported_flag (ProcessContext<T>::EndOfInput);
pthread_mutex_init (&_disk_thread_lock, 0);
pthread_cond_init (&_data_ready, 0);
if (pthread_create (&_thread_id, NULL, _disk_thread, this)) {
_capture = false;
if (SndfileWriter<T>::throw_level (ThrowStrict)) {
throw Exception (*this, "Cannot create export disk writer");
}
}
}
private:
TmpFileRt (TmpFileRt const & other) : SndfileHandle (other) {}
};
} // namespace
#endif // AUDIOGRAPHER_TMP_FILE_RT_H
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