1 files changed, 46 insertions, 0 deletions
diff --git a/src/alsa_pcm.h b/src/alsa_pcm.h
new file mode 100644
index 0000000..fafd857
--- /dev/null
+++ b/src/alsa_pcm.h
@@ -0,0 +1,46 @@
+#ifndef ALSA_PCM__H
+#define ALSA_PCM__H
+
+#include <string>
+#include <alsa/asoundlib.h>
+
+const int FPP(1024);            // frames per period
+
+class alsa_pcm{
+public:
+  snd_pcm_t* phndl;             // pcm handle
+#if 0
+  DO NOT save a pointer to any snd_pcm_hw_params_t object;
+  alsa allocates space _on the stack_ and it goes out of
+  scope quickly.
+  snd_pcm_hw_params_t *hwparams;
+#endif
+  snd_output_t* errlog;
+  unsigned int nchan;           // samples per frame; 2 ==> stereo
+  unsigned int max_rate;
+  unsigned int rate;            // frames per second
+  int sbits;                    // significant bits
+  snd_pcm_stream_t direction;
+//  int sizeofsamp;             // bytes per sample
+  snd_pcm_format_t format;
+  const char* moniker;
+  snd_htimestamp_t ss_time();   // start or stop time (usually start time)
+  snd_htimestamp_t now();       // current time
+  void error(const char*, const int, snd_pcm_hw_params_t*);
+  int getrate(const std::string carddevice,
+        snd_pcm_stream_t stream_dir,
+        const int dumpflag);
+  int setup(const int rate);
+// Constructor doesn't do much,
+// so it is cheap to allocate one that you're not
+// necessarily going to use:
+  inline alsa_pcm(const char* mm)
+           : phndl(0), errlog(0), moniker(mm)
+  {}
+  int try_formats(snd_pcm_hw_params_t*);
+  std::string alsa_state_name();
+};
+
+void device_list(const snd_pcm_stream_t direction);
+
+#endif /* ALSA_PCM__H */