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 #define PA_TYPEID_MEMCHUNK PA_TYPEID_MAKE('M', 'C', 'N', 'K')
  36
  37 static void sink_input_kill(struct pa_sink_input *i) {
  38     struct pa_memchunk *c;
  39     assert(i && i->userdata);
  40     c = i->userdata;
  41
  42     pa_sink_input_disconnect(i);
  43     pa_sink_input_unref(i);
  44
  45     pa_memblock_unref(c->memblock);
  46     pa_xfree(c);
  47
  48 }
  49
  50 static int sink_input_peek(struct pa_sink_input *i, struct pa_memchunk *chunk) {
  51     struct pa_memchunk *c;
  52     assert(i && chunk && i->userdata);
  53     c = i->userdata;
  54
  55     if (c->length <= 0)
  56         return -1;
  57
  58     assert(c->memblock && c->memblock->length);
  59     *chunk = *c;
  60     pa_memblock_ref(c->memblock);
  61
  62     return 0;
  63 }
  64
  65 static void si_kill(struct pa_mainloop_api *m, void *i) {
  66     sink_input_kill(i);
  67 }
  68
  69 static void sink_input_drop(struct pa_sink_input *i, const struct pa_memchunk*chunk, size_t length) {
  70     struct pa_memchunk *c;
  71     assert(i && length && i->userdata);
  72     c = i->userdata;
  73
  74     assert(!memcmp(chunk, c, sizeof(chunk)));
  75     assert(length <= c->length);
  76
  77     c->length -= length;
  78     c->index += length;
  79
  80     if (c->length <= 0)
  81         pa_mainloop_api_once(i->sink->core->mainloop, si_kill, i);
  82 }
  83
  84 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) {
  85     struct pa_sink_input *si;
  86     struct pa_memchunk *nchunk;
  87
  88     assert(sink && chunk);
  89
  90     if (volume <= 0)
  91         return 0;
  92
  93     if (!(si = pa_sink_input_new(sink, PA_TYPEID_MEMCHUNK, name, ss, 0, -1)))
  94         return -1;
  95
  96     si->volume = volume;
  97     si->peek = sink_input_peek;
  98     si->drop = sink_input_drop;
  99     si->kill = sink_input_kill;
 100
 101     si->userdata = nchunk = pa_xmalloc(sizeof(struct pa_memchunk));
 102     *nchunk = *chunk;
 103
 104     pa_memblock_ref(chunk->memblock);
 105
 106     pa_sink_notify(sink);
 107
 108     return 0;
 109 }