output.h

   1 /*
   2  * Copyright 2005 Timo Hirvonen
   3  */
   4
   5 #ifndef _OUTPUT_H
   6 #define _OUTPUT_H
   7
   8 #include "mixer.h"
   9 #include "op.h"
  10 #include "sf.h"
  11
  12 extern int volume_max;
  13 extern int volume_l;
  14 extern int volume_r;
  15
  16 void op_load_plugins(void);
  17 void op_exit_plugins(void);
  18
  19 /*
  20  * select output plugin and open its mixer
  21  *
  22  * errors: OP_ERROR_{ERRNO, NO_PLUGIN}
  23  */
  24 int op_select(const char *name);
  25 int op_select_any(void);
  26
  27 /*
  28  * open selected plugin
  29  *
  30  * errors: OP_ERROR_{}
  31  */
  32 int op_open(sample_format_t sf);
  33
  34 /*
  35  * drop pcm data
  36  *
  37  * errors: OP_ERROR_{ERRNO}
  38  */
  39 int op_drop(void);
  40
  41 /*
  42  * close plugin
  43  *
  44  * errors: OP_ERROR_{}
  45  */
  46 int op_close(void);
  47
  48 /*
  49  * returns bytes written or error
  50  *
  51  * errors: OP_ERROR_{ERRNO}
  52  */
  53 int op_write(const char *buffer, int count);
  54
  55 /*
  56  * errors: OP_ERROR_{}
  57  */
  58 int op_pause(void);
  59 int op_unpause(void);
  60
  61 /*
  62  * returns space in output buffer in bytes or -1 if busy
  63  */
  64 int op_buffer_space(void);
  65
  66 /*
  67  * errors: OP_ERROR_{}
  68  */
  69 int op_reset(void);
  70
  71 void mixer_open(void);
  72 void mixer_close(void);
  73 int mixer_set_volume(int left, int right);
  74 int mixer_read_volume(void);
  75 int mixer_get_fds(int *fds);
  76
  77 /*
  78  * errors: OP_ERROR_{NO_PLUGIN, NOT_INITIALIZED, NOT_OPTION}
  79  */
  80 int op_set_option(unsigned int id, const char *val);
  81 int op_get_option(unsigned int id, char **val);
  82
  83 int op_for_each_option(void (*cb)(unsigned int id, const char *key));
  84 char *op_get_error_msg(int rc, const char *arg);
  85 void op_dump_plugins(void);
  86 char *op_get_current(void);
  87
  88 #endif