+/** @class AudioBuffers
+ * @brief A class to hold multi-channel audio data in float format.
+ */
+class AudioBuffers
+{
+public:
+ AudioBuffers (int channels, int frames);
+ AudioBuffers (AudioBuffers const &);
+ AudioBuffers (boost::shared_ptr<const AudioBuffers>);
+ ~AudioBuffers ();
+
+ float** data () const {
+ return _data;
+ }
+
+ float* data (int) const;
+
+ int channels () const {
+ return _channels;
+ }
+
+ int frames () const {
+ return _frames;
+ }
+
+ void set_frames (int f);
+
+ void make_silent ();
+ void make_silent (int c);
+
+ void copy_from (AudioBuffers* from, int frames_to_copy, int read_offset, int write_offset);
+ void move (int from, int to, int frames);
+
+private:
+ /** Number of channels */
+ int _channels;
+ /** Number of frames (where a frame is one sample across all channels) */
+ int _frames;
+ /** Number of frames that _data can hold */
+ int _allocated_frames;
+ /** Audio data (so that, e.g. _data[2][6] is channel 2, sample 6) */
+ float** _data;
+};
+
+class AudioMapping
+{
+public:
+ AudioMapping (boost::shared_ptr<const Film>);
+
+ boost::optional<libdcp::Channel> source_to_dcp (int c) const;
+ boost::optional<int> dcp_to_source (libdcp::Channel c) const;
+
+ int minimum_dcp_channels () const;
+ int dcp_channels () const;
+
+private:
+ int _source_channels;
+ int _minimum_channels;
+};
+
+extern int64_t video_frames_to_audio_frames (SourceFrame v, float audio_sample_rate, float frames_per_second);
+extern bool still_image_file (std::string);
+
+class LocaleGuard
+{
+public:
+ LocaleGuard ();
+ ~LocaleGuard ();
+
+private:
+ char* _old;
+};
+
+