libs/audiographer/audiographer/sndfile/sndfile_writer.h

   1 #ifndef AUDIOGRAPHER_SNDFILE_WRITER_H
   2 #define AUDIOGRAPHER_SNDFILE_WRITER_H
   3
   4 #include <string>
   5
   6 #include <boost/format.hpp>
   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, framecnt_t samplerate, boost::shared_ptr<BroadcastInfo> broadcast_info)
  31           : SndfileHandle (path, Write, format, channels, samplerate)
  32           , path (path)
  33         {
  34                 init();
  35
  36                 if (broadcast_info) {
  37                         broadcast_info->write_to_file (this);
  38                 }
  39         }
  40
  41         virtual ~SndfileWriter () {}
  42
  43         SndfileWriter (SndfileWriter const & other)
  44                 : SndfileHandle (other)
  45         {
  46                 init();
  47         }
  48
  49         using SndfileHandle::operator=;
  50
  51         framecnt_t get_frames_written() const { return frames_written; }
  52         void       reset_frames_written_count() { frames_written = 0; }
  53
  54         /// Writes data to file
  55         void process (ProcessContext<T> const & c)
  56         {
  57                 check_flags (*this, c);
  58
  59                 if (throw_level (ThrowStrict) && c.channels() != channels()) {
  60                         throw Exception (*this, boost::str (boost::format
  61                                 ("Wrong number of channels given to process(), %1% instead of %2%")
  62                                 % c.channels() % channels()));
  63                 }
  64
  65                 framecnt_t const written = write (c.data(), c.frames());
  66                 frames_written += written;
  67
  68                 if (throw_level (ThrowProcess) && written != c.frames()) {
  69                         throw Exception (*this, boost::str (boost::format
  70                                 ("Could not write data to output file (%1%)")
  71                                 % strError()));
  72                 }
  73
  74                 if (c.has_flag(ProcessContext<T>::EndOfInput)) {
  75                         writeSync();
  76                         FileWritten (path);
  77                 }
  78         }
  79
  80         using Sink<T>::process;
  81
  82         PBD::Signal1<void, std::string> FileWritten;
  83
  84   protected:
  85         /// SndfileHandle has to be constructed directly by deriving classes
  86         SndfileWriter ()
  87         {
  88                 init();
  89         }
  90
  91         void init()
  92         {
  93                 frames_written = 0;
  94                 add_supported_flag (ProcessContext<T>::EndOfInput);
  95         }
  96
  97   protected:
  98         std::string path;
  99         framecnt_t frames_written;
 100 };
 101
 102 } // namespace
 103
 104 #endif // AUDIOGRAPHER_SNDFILE_WRITER_H