code.delx.au - pulseaudio/blob - polyp/play-memchunk.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 Lesser 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 Lesser 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 <stdlib.h>
  27 #include <assert.h>
  28 #include <stdio.h>
  29 #include <string.h>
  30
  31 #include "play-memchunk.h"
  32 #include "sink-input.h"
  33 #include "xmalloc.h"
  34
  35 static void sink_input_kill(struct pa_sink_input *i) {
  36     struct pa_memchunk *c;
  37     assert(i && i->userdata);
  38     c = i->userdata;
  39
  40     pa_sink_input_disconnect(i);
  41     pa_sink_input_unref(i);
  42
  43     pa_memblock_unref(c->memblock);
  44     pa_xfree(c);
  45
  46 }
  47
  48 static int sink_input_peek(struct pa_sink_input *i, struct pa_memchunk *chunk) {
  49     struct pa_memchunk *c;
  50     assert(i && chunk && i->userdata);
  51     c = i->userdata;
  52
  53     if (c->length <= 0)
  54         return -1;
  55
  56     assert(c->memblock && c->memblock->length);
  57     *chunk = *c;
  58     pa_memblock_ref(c->memblock);
  59
  60     return 0;
  61 }
  62
  63 static void si_kill(struct pa_mainloop_api *m, void *i) {
  64     sink_input_kill(i);
  65 }
  66
  67 static void sink_input_drop(struct pa_sink_input *i, const struct pa_memchunk*chunk, size_t length) {
  68     struct pa_memchunk *c;
  69     assert(i && length && i->userdata);
  70     c = i->userdata;
  71
  72     assert(!memcmp(chunk, c, sizeof(chunk)));
  73     assert(length <= c->length);
  74
  75     c->length -= length;
  76     c->index += length;
  77
  78     if (c->length <= 0)
  79         pa_mainloop_api_once(i->sink->core->mainloop, si_kill, i);
  80 }
  81
  82 int pa_play_memchunk(struct pa_sink *sink, const char *name, const struct pa_sample_spec *ss, const struct pa_memchunk *chunk, pa_volume_t volume) {
  83     struct pa_sink_input *si;
  84     struct pa_memchunk *nchunk;
  85
  86     assert(sink && chunk);
  87
  88     if (volume <= 0)
  89         return 0;
  90
  91     if (!(si = pa_sink_input_new(sink, name, ss, 0, -1)))
  92         return -1;
  93
  94     si->volume = volume;
  95     si->peek = sink_input_peek;
  96     si->drop = sink_input_drop;
  97     si->kill = sink_input_kill;
  98
  99     si->userdata = nchunk = pa_xmalloc(sizeof(struct pa_memchunk));
 100     *nchunk = *chunk;
 101
 102     pa_memblock_ref(chunk->memblock);
 103
 104     pa_sink_notify(sink);
 105
 106     return 0;
 107 }