code.delx.au - pulseaudio/blob - src/sample.h

   1 #ifndef foosamplehfoo
   2 #define foosamplehfoo
   3
   4 #include <inttypes.h>
   5
   6 #include "memblock.h"
   7
   8 enum sample_format {
   9     SAMPLE_U8,
  10     SAMPLE_ALAW,
  11     SAMPLE_ULAW,
  12     SAMPLE_S16LE,
  13     SAMPLE_S16BE,
  14     SAMPLE_FLOAT32
  15 };
  16
  17 #define SAMPLE_S16NE SAMPLE_S16LE
  18
  19 struct sample_spec {
  20     enum sample_format format;
  21     uint32_t rate;
  22     uint8_t channels;
  23 };
  24
  25 #define DEFAULT_SAMPLE_SPEC default_sample_spec
  26
  27 extern struct sample_spec default_sample_spec;
  28
  29 struct memblock *silence_memblock(struct memblock* b, struct sample_spec *spec);
  30 void silence_memchunk(struct memchunk *c, struct sample_spec *spec);
  31 void silence_memory(void *p, size_t length, struct sample_spec *spec);
  32
  33 struct mix_info {
  34     struct memchunk chunk;
  35     uint8_t volume;
  36     void *userdata;
  37 };
  38
  39 size_t mix_chunks(struct mix_info channels[], unsigned nchannels, void *data, size_t length, struct sample_spec *spec, uint8_t volume);
  40
  41 size_t bytes_per_second(struct sample_spec *spec);
  42 size_t sample_size(struct sample_spec *spec);
  43 uint32_t samples_usec(size_t length, struct sample_spec *spec);
  44
  45 #endif