playsink.c

   1 #include "graph.h"
   2 #include "errors.h"
   3 #include "soundout.h"
   4
   5 struct playsink {
   6     struct buffer *buf;
   7     bool is_open;
   8     struct soundout so;
   9 };
  10
  11 static bool is_acceptable_input_format(struct graphnode *node, struct graphpin *pin, const struct aformat *af)
  12 {
  13     return af->media == MT_AUDIO_16I;
  14 }
  15
  16 static err_t set_buffer(struct graphnode *node, struct graphpin *pin, struct buffer *buf)
  17 {
  18     struct playsink *ps = node->extra;
  19     ps->buf = buf;
  20     if (!ps->is_open){
  21         if (soundout_open(&ps->so, &buf->format) != 0){
  22             return make_error(-1, node, "cannot open soundout");
  23         }
  24         ps->is_open = true;
  25     }
  26     return EOK;
  27 }
  28
  29 static err_t run(struct graphnode *node)
  30 {
  31     struct playsink *ps = node->extra;
  32
  33     if (soundout_write(&ps->so, ps->buf->data, ps->buf->n_samples * aformat_get_sample_size(&ps->buf->format)) != 0){
  34         return make_error(-1, node, "cannot write to soundout");
  35     }
  36     return EOK;
  37 }
  38
  39 static const struct graphnode_functab functab = {
  40     is_acceptable_input_format,
  41     NULL,   // get_output_format
  42     set_buffer,
  43     run,
  44 };
  45
  46 err_t playsink_create(struct graphnode **node_out)
  47 {
  48     struct graphnode *node;
  49     struct graphpin *pin;
  50     struct playsink *ps;
  51     err_t err;
  52
  53     err = graphnode_create(&node, &functab, sizeof *ps);
  54     if (err != EOK){
  55         return err;
  56     }
  57
  58     err = graphnode_add_pin(node, &pin);
  59     if (err != EOK){
  60         return err;
  61     }
  62     pin->dir = DIR_IN;
  63     pin->name = "in";
  64
  65     ps = node->extra;
  66     ps->is_open = false;
  67
  68     *node_out = node;
  69     return EOK;
  70 }