Add Pipe-to-command export backend
A first step towards allowing external encoders without intermediate temporary file.
This commit is contained in:
parent
a5b38fd6dc
commit
e4cbd5115e
87
libs/audiographer/audiographer/general/cmdpipe_writer.h
Normal file
87
libs/audiographer/audiographer/general/cmdpipe_writer.h
Normal file
@ -0,0 +1,87 @@
|
||||
#ifndef AUDIOGRAPHER_CMDPIPE_WRITER_H
|
||||
#define AUDIOGRAPHER_CMDPIPE_WRITER_H
|
||||
|
||||
#include <string>
|
||||
|
||||
#include <boost/format.hpp>
|
||||
|
||||
#include "audiographer/flag_debuggable.h"
|
||||
#include "audiographer/sink.h"
|
||||
#include "audiographer/types.h"
|
||||
|
||||
#include "pbd/signals.h"
|
||||
#include "pbd/system_exec.h"
|
||||
|
||||
namespace AudioGrapher
|
||||
{
|
||||
|
||||
/** Writer for audio files using libsndfile.
|
||||
* Only short, int and float are valid template parameters
|
||||
*/
|
||||
template <typename T = DefaultSampleType>
|
||||
class CmdPipeWriter
|
||||
: public Sink<T>
|
||||
, public Throwing<>
|
||||
, public FlagDebuggable<>
|
||||
{
|
||||
public:
|
||||
CmdPipeWriter (PBD::SystemExec* proc, std::string const& path)
|
||||
: samples_written (0)
|
||||
, _proc (proc)
|
||||
, _path (path)
|
||||
{
|
||||
add_supported_flag (ProcessContext<T>::EndOfInput);
|
||||
}
|
||||
|
||||
virtual ~CmdPipeWriter () {
|
||||
delete _proc;
|
||||
}
|
||||
|
||||
samplecnt_t get_samples_written() const { return samples_written; }
|
||||
void reset_samples_written_count() { samples_written = 0; }
|
||||
|
||||
void close (void)
|
||||
{
|
||||
_proc->terminate ();
|
||||
}
|
||||
|
||||
virtual void process (ProcessContext<T> const & c)
|
||||
{
|
||||
check_flags (*this, c);
|
||||
|
||||
if (!_proc || !_proc->is_running()) {
|
||||
throw Exception (*this, boost::str (boost::format
|
||||
("Target encoder process is not running")));
|
||||
}
|
||||
|
||||
const size_t bytes_per_sample = sizeof (T);
|
||||
samplecnt_t const written = _proc->write_to_stdin ((const void*) c.data(), c.samples() * bytes_per_sample) / bytes_per_sample;
|
||||
samples_written += written;
|
||||
|
||||
if (throw_level (ThrowProcess) && written != c.samples()) {
|
||||
throw Exception (*this, boost::str (boost::format
|
||||
("Could not write data to output file")));
|
||||
}
|
||||
|
||||
if (c.has_flag(ProcessContext<T>::EndOfInput)) {
|
||||
_proc->close_stdin ();
|
||||
FileWritten (_path);
|
||||
}
|
||||
}
|
||||
|
||||
using Sink<T>::process;
|
||||
|
||||
PBD::Signal1<void, std::string> FileWritten;
|
||||
|
||||
private:
|
||||
CmdPipeWriter (CmdPipeWriter const & other) {}
|
||||
|
||||
samplecnt_t samples_written;
|
||||
PBD::SystemExec* _proc;
|
||||
std::string _path;
|
||||
};
|
||||
|
||||
} // namespace
|
||||
|
||||
#endif
|
||||
|
Loading…
Reference in New Issue
Block a user