218158/af_volnorm.i.3

   1 typedef struct af_data_s {
   2 } af_data_t;
   3 typedef struct af_info_s {
   4         const char *info;
   5         const char *name;
   6         const char *author;
   7         const char *comment;
   8         const int flags;
   9         int (*open) (struct af_instance_s * vf);
  10 } af_info_t;
  11 typedef struct af_instance_s {
  12         af_data_t *(*play) (struct af_instance_s * af, af_data_t * data);
  13         void *setup;
  14 } af_instance_t;
  15 typedef struct af_volume_s {
  16         float mul;
  17         struct {
  18                 float avg;
  19                 int len;
  20         } mem[128];
  21         float mid_s16;
  22 } af_volnorm_t;
  23 static void method2_int16(af_volnorm_t * s, af_data_t * c)
  24 {
  25         register int i = 0;
  26         float avg = 0.0;
  27         for (i = 0; i < 128; i++)
  28                 avg += s->mem[i].avg * (float)s->mem[i].len;
  29         s->mul = s->mid_s16 / avg;
  30 }
  31 static af_data_t *play(struct af_instance_s *af, af_data_t * data)
  32 {
  33         af_volnorm_t *s = af->setup;
  34         method2_int16(s, data);
  35 }
  36 static int af_open(af_instance_t * af)
  37 {
  38         af->play = play;
  39 }
  40
  41 af_info_t af_info_volnorm = {
  42         "Volume normalizer filter", "volnorm",
  43             "Alex Beregszaszi & Pierre Lombard", "", 0x00000001, af_open
  44 };