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

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of polypaudio.
   5
   6   polypaudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published
   8   by the Free Software Foundation; either version 2 of the License,
   9   or (at your option) any later version.
  10
  11   polypaudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with polypaudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdio.h>
  27 #include <assert.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30
  31 #include "sink-input.h"
  32 #include "sample-util.h"
  33
  34 #define CONVERT_BUFFER_LENGTH 4096
  35
  36 struct pa_sink_input* pa_sink_input_new(struct pa_sink *s, const char *name, const struct pa_sample_spec *spec) {
  37     struct pa_sink_input *i;
  38     struct pa_resampler *resampler = NULL;
  39     int r;
  40     char st[256];
  41     assert(s && spec);
  42
  43     if (!pa_sample_spec_equal(spec, &s->sample_spec))
  44         if (!(resampler = pa_resampler_new(spec, &s->sample_spec)))
  45             return NULL;
  46
  47     i = malloc(sizeof(struct pa_sink_input));
  48     assert(i);
  49     i->name = name ? strdup(name) : NULL;
  50     i->client = NULL;
  51     i->owner = NULL;
  52     i->sink = s;
  53     i->sample_spec = *spec;
  54
  55     i->peek = NULL;
  56     i->drop = NULL;
  57     i->kill = NULL;
  58     i->get_latency = NULL;
  59     i->userdata = NULL;
  60
  61     i->volume = PA_VOLUME_NORM;
  62
  63     i->resampled_chunk.memblock = NULL;
  64     i->resampled_chunk.index = i->resampled_chunk.length = 0;
  65     i->resampler = resampler;
  66
  67     assert(s->core);
  68     r = pa_idxset_put(s->core->sink_inputs, i, &i->index);
  69     assert(r == 0 && i->index != PA_IDXSET_INVALID);
  70     r = pa_idxset_put(s->inputs, i, NULL);
  71     assert(r == 0);
  72
  73     pa_sample_snprint(st, sizeof(st), spec);
  74     fprintf(stderr, "sink-input: created %u \"%s\" on %u with sample spec \"%s\"\n", i->index, i->name, s->index, st);
  75
  76     return i;
  77 }
  78
  79 void pa_sink_input_free(struct pa_sink_input* i) {
  80     assert(i);
  81
  82     assert(i->sink && i->sink->core);
  83     pa_idxset_remove_by_data(i->sink->core->sink_inputs, i, NULL);
  84     pa_idxset_remove_by_data(i->sink->inputs, i, NULL);
  85
  86     if (i->resampled_chunk.memblock)
  87         pa_memblock_unref(i->resampled_chunk.memblock);
  88     if (i->resampler)
  89         pa_resampler_free(i->resampler);
  90
  91     free(i->name);
  92     free(i);
  93 }
  94
  95 void pa_sink_input_kill(struct pa_sink_input*i) {
  96     assert(i);
  97
  98     if (i->kill)
  99         i->kill(i);
 100 }
 101
 102 uint32_t pa_sink_input_get_latency(struct pa_sink_input *i) {
 103     uint32_t l = 0;
 104
 105     assert(i);
 106     if (i->get_latency)
 107         l += i->get_latency(i);
 108
 109     assert(i->sink);
 110     l += pa_sink_get_latency(i->sink);
 111
 112     return l;
 113 }
 114
 115 int pa_sink_input_peek(struct pa_sink_input *i, struct pa_memchunk *chunk) {
 116     assert(i && chunk && i->peek && i->drop);
 117
 118     if (!i->resampler)
 119         return i->peek(i, chunk);
 120
 121     if (!i->resampled_chunk.memblock) {
 122         struct pa_memchunk tchunk;
 123         size_t l;
 124         int ret;
 125
 126         if ((ret = i->peek(i, &tchunk)) < 0)
 127             return ret;
 128
 129         l = pa_resampler_request(i->resampler, CONVERT_BUFFER_LENGTH);
 130         if (tchunk.length > l)
 131             tchunk.length = l;
 132
 133         i->drop(i, tchunk.length);
 134
 135         pa_resampler_run(i->resampler, &tchunk, &i->resampled_chunk);
 136         pa_memblock_unref(tchunk.memblock);
 137     }
 138
 139     assert(i->resampled_chunk.memblock && i->resampled_chunk.length);
 140     *chunk = i->resampled_chunk;
 141     pa_memblock_ref(i->resampled_chunk.memblock);
 142     return 0;
 143 }
 144
 145 void pa_sink_input_drop(struct pa_sink_input *i, size_t length) {
 146     assert(i && length);
 147
 148     if (!i->resampler) {
 149         i->drop(i, length);
 150         return;
 151     }
 152
 153     assert(i->resampled_chunk.memblock && i->resampled_chunk.length >= length);
 154
 155     i->resampled_chunk.index += length;
 156     i->resampled_chunk.length -= length;
 157
 158     if (!i->resampled_chunk.length) {
 159         pa_memblock_unref(i->resampled_chunk.memblock);
 160         i->resampled_chunk.memblock = NULL;
 161         i->resampled_chunk.index = i->resampled_chunk.length = 0;
 162     }
 163 }