code.delx.au - pulseaudio/blob - src/sink-input.c

   1 #include <stdio.h>
   2 #include <assert.h>
   3 #include <stdlib.h>
   4 #include <string.h>
   5
   6 #include "sinkinput.h"
   7 #include "sample-util.h"
   8
   9 #define CONVERT_BUFFER_LENGTH 4096
  10
  11 struct pa_sink_input* pa_sink_input_new(struct pa_sink *s, const char *name, const struct pa_sample_spec *spec) {
  12     struct pa_sink_input *i;
  13     struct pa_resampler *resampler = NULL;
  14     int r;
  15     char st[256];
  16     assert(s && spec);
  17
  18     if (!pa_sample_spec_equal(spec, &s->sample_spec))
  19         if (!(resampler = pa_resampler_new(spec, &s->sample_spec)))
  20             return NULL;
  21
  22     i = malloc(sizeof(struct pa_sink_input));
  23     assert(i);
  24     i->name = name ? strdup(name) : NULL;
  25     i->client = NULL;
  26     i->owner = NULL;
  27     i->sink = s;
  28     i->sample_spec = *spec;
  29
  30     i->peek = NULL;
  31     i->drop = NULL;
  32     i->kill = NULL;
  33     i->get_latency = NULL;
  34     i->userdata = NULL;
  35
  36     i->volume = PA_VOLUME_NORM;
  37
  38     i->resampled_chunk.memblock = NULL;
  39     i->resampled_chunk.index = i->resampled_chunk.length = 0;
  40     i->resampler = resampler;
  41
  42     assert(s->core);
  43     r = pa_idxset_put(s->core->sink_inputs, i, &i->index);
  44     assert(r == 0 && i->index != PA_IDXSET_INVALID);
  45     r = pa_idxset_put(s->inputs, i, NULL);
  46     assert(r == 0);
  47
  48     pa_sample_snprint(st, sizeof(st), spec);
  49     fprintf(stderr, "sink-input: created %u \"%s\" on %u with sample spec \"%s\"\n", i->index, i->name, s->index, st);
  50
  51     return i;
  52 }
  53
  54 void pa_sink_input_free(struct pa_sink_input* i) {
  55     assert(i);
  56
  57     assert(i->sink && i->sink->core);
  58     pa_idxset_remove_by_data(i->sink->core->sink_inputs, i, NULL);
  59     pa_idxset_remove_by_data(i->sink->inputs, i, NULL);
  60
  61     if (i->resampled_chunk.memblock)
  62         pa_memblock_unref(i->resampled_chunk.memblock);
  63     if (i->resampler)
  64         pa_resampler_free(i->resampler);
  65
  66     free(i->name);
  67     free(i);
  68 }
  69
  70 void pa_sink_input_kill(struct pa_sink_input*i) {
  71     assert(i);
  72
  73     if (i->kill)
  74         i->kill(i);
  75 }
  76
  77 uint32_t pa_sink_input_get_latency(struct pa_sink_input *i) {
  78     uint32_t l = 0;
  79
  80     assert(i);
  81     if (i->get_latency)
  82         l += i->get_latency(i);
  83
  84     assert(i->sink);
  85     l += pa_sink_get_latency(i->sink);
  86
  87     return l;
  88 }
  89
  90 int pa_sink_input_peek(struct pa_sink_input *i, struct pa_memchunk *chunk) {
  91     assert(i && chunk && i->peek && i->drop);
  92
  93     if (!i->resampler)
  94         return i->peek(i, chunk);
  95
  96     if (!i->resampled_chunk.memblock) {
  97         struct pa_memchunk tchunk;
  98         size_t l;
  99         int ret;
 100
 101         if ((ret = i->peek(i, &tchunk)) < 0)
 102             return ret;
 103
 104         l = pa_resampler_request(i->resampler, CONVERT_BUFFER_LENGTH);
 105         if (tchunk.length > l)
 106             tchunk.length = l;
 107
 108         i->drop(i, tchunk.length);
 109
 110         pa_resampler_run(i->resampler, &tchunk, &i->resampled_chunk);
 111         pa_memblock_unref(tchunk.memblock);
 112     }
 113
 114     assert(i->resampled_chunk.memblock && i->resampled_chunk.length);
 115     *chunk = i->resampled_chunk;
 116     pa_memblock_ref(i->resampled_chunk.memblock);
 117     return 0;
 118 }
 119
 120 void pa_sink_input_drop(struct pa_sink_input *i, size_t length) {
 121     assert(i && length);
 122
 123     if (!i->resampler) {
 124         i->drop(i, length);
 125         return;
 126     }
 127
 128     assert(i->resampled_chunk.memblock && i->resampled_chunk.length >= length);
 129
 130     i->resampled_chunk.index += length;
 131     i->resampled_chunk.length -= length;
 132
 133     if (!i->resampled_chunk.length) {
 134         pa_memblock_unref(i->resampled_chunk.memblock);
 135         i->resampled_chunk.memblock = NULL;
 136         i->resampled_chunk.index = i->resampled_chunk.length = 0;
 137     }
 138 }