libs/audiographer/audiographer/sndfile/sndfile_writer.h

   1 #ifndef AUDIOGRAPHER_SNDFILE_WRITER_H
   2 #define AUDIOGRAPHER_SNDFILE_WRITER_H
   3
   4 #include <boost/signals2.hpp>
   5 #include <boost/format.hpp>
   6 #include <string>
   7
   8 #include "audiographer/flag_debuggable.h"
   9 #include "audiographer/sink.h"
  10 #include "audiographer/types.h"
  11 #include "audiographer/sndfile/sndfile_base.h"
  12 #include "audiographer/broadcast_info.h"
  13
  14 #include "pbd/signals.h"
  15
  16 namespace AudioGrapher
  17 {
  18
  19 /** Writer for audio files using libsndfile.
  20   * Only short, int and float are valid template parameters
  21   */
  22 template <typename T = DefaultSampleType>
  23 class SndfileWriter
  24   : public virtual SndfileBase
  25   , public Sink<T>
  26   , public Throwing<>
  27   , public FlagDebuggable<>
  28 {
  29   public:
  30         SndfileWriter (std::string const & path, int format, ChannelCount channels, nframes_t samplerate, boost::shared_ptr<BroadcastInfo> broadcast_info)
  31           : SndfileHandle (path, Write, format, channels, samplerate)
  32           , path (path)
  33         {
  34                 add_supported_flag (ProcessContext<T>::EndOfInput);
  35
  36                 if (broadcast_info) {
  37                         broadcast_info->write_to_file (this);
  38                 }
  39         }
  40
  41         virtual ~SndfileWriter () {}
  42
  43         SndfileWriter (SndfileWriter const & other) : SndfileHandle (other) {}
  44         using SndfileHandle::operator=;
  45
  46         /// Writes data to file
  47         void process (ProcessContext<T> const & c)
  48         {
  49                 check_flags (*this, c);
  50
  51                 if (throw_level (ThrowStrict) && c.channels() != channels()) {
  52                         throw Exception (*this, boost::str (boost::format
  53                                 ("Wrong number of channels given to process(), %1% instead of %2%")
  54                                 % c.channels() % channels()));
  55                 }
  56
  57                 nframes_t written = write (c.data(), c.frames());
  58                 if (throw_level (ThrowProcess) && written != c.frames()) {
  59                         throw Exception (*this, boost::str (boost::format
  60                                 ("Could not write data to output file (%1%)")
  61                                 % strError()));
  62                 }
  63
  64                 if (c.has_flag(ProcessContext<T>::EndOfInput)) {
  65                         writeSync();
  66                         FileWritten (path);
  67                 }
  68         }
  69
  70         using Sink<T>::process;
  71
  72         PBD::Signal1<void, std::string> FileWritten;
  73
  74   protected:
  75         /// SndfileHandle has to be constructed directly by deriving classes
  76         SndfileWriter ()
  77         {
  78                 add_supported_flag (ProcessContext<T>::EndOfInput);
  79         }
  80
  81   protected:
  82         std::string path;
  83 };
  84
  85 } // namespace
  86
  87 #endif // AUDIOGRAPHER_SNDFILE_WRITER_H