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 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 <stdlib.h>
  27 #include <assert.h>
  28
  29 #include "play-memchunk.h"
  30 #include "sink-input.h"
  31 #include "xmalloc.h"
  32
  33 static void sink_input_kill(struct pa_sink_input *i) {
  34     struct pa_memchunk *c;
  35     assert(i && i->userdata);
  36     c = i->userdata;
  37
  38     pa_memblock_unref(c->memblock);
  39     pa_xfree(c);
  40     pa_sink_input_free(i);
  41 }
  42
  43 static int sink_input_peek(struct pa_sink_input *i, struct pa_memchunk *chunk) {
  44     struct pa_memchunk *c;
  45     assert(i && chunk && i->userdata);
  46     c = i->userdata;
  47
  48     if (c->length <= 0)
  49         return -1;
  50
  51     assert(c->memblock && c->memblock->length);
  52     *chunk = *c;
  53     pa_memblock_ref(c->memblock);
  54
  55     return 0;
  56 }
  57
  58 static void si_kill(struct pa_mainloop_api *m, void *i) {
  59     sink_input_kill(i);
  60 }
  61
  62 static void sink_input_drop(struct pa_sink_input *i, const struct pa_memchunk*chunk, size_t length) {
  63     struct pa_memchunk *c;
  64     assert(i && length && i->userdata);
  65     c = i->userdata;
  66
  67     assert(chunk == c);
  68     assert(length <= c->length);
  69
  70     c->length -= length;
  71     c->index += length;
  72
  73     if (c->length <= 0)
  74         pa_mainloop_api_once(i->sink->core->mainloop, si_kill, i);
  75 }
  76
  77 int pa_play_memchunk(struct pa_sink *sink, const char *name, const struct pa_sample_spec *ss, const struct pa_memchunk *chunk, uint32_t volume) {
  78     struct pa_sink_input *si;
  79     struct pa_memchunk *nchunk;
  80
  81     assert(sink && chunk);
  82
  83     if (volume <= 0)
  84         return 0;
  85
  86     if (!(si = pa_sink_input_new(sink, name, ss)))
  87         return -1;
  88
  89     si->volume = volume;
  90     si->peek = sink_input_peek;
  91     si->drop = sink_input_drop;
  92     si->kill = sink_input_kill;
  93
  94     si->userdata = nchunk = pa_xmalloc(sizeof(struct pa_memchunk));
  95     *nchunk = *chunk;
  96
  97     pa_memblock_ref(chunk->memblock);
  98
  99     pa_sink_notify(sink);
 100
 101     return 0;
 102 }