code.delx.au - pulseaudio/blob - src/pulsecore/play-memchunk.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   PulseAudio 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   PulseAudio 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 PulseAudio; 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 <pulse/xmalloc.h>
  32
  33 #include <pulsecore/sink-input.h>
  34 #include <pulsecore/gccmacro.h>
  35
  36 #include "play-memchunk.h"
  37
  38 static void sink_input_kill(pa_sink_input *i) {
  39     pa_memchunk *c;
  40     assert(i && i->userdata);
  41     c = i->userdata;
  42
  43     pa_sink_input_disconnect(i);
  44     pa_sink_input_unref(i);
  45
  46     pa_memblock_unref(c->memblock);
  47     pa_xfree(c);
  48 }
  49
  50 static int sink_input_peek(pa_sink_input *i, pa_memchunk *chunk) {
  51     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(PA_GCC_UNUSED pa_mainloop_api *m, void *i) {
  66     sink_input_kill(i);
  67 }
  68
  69 static void sink_input_drop(pa_sink_input *i, const pa_memchunk*chunk, size_t length) {
  70     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(
  85     pa_sink *sink,
  86     const char *name,
  87     const pa_sample_spec *ss,
  88     const pa_channel_map *map,
  89     const pa_memchunk *chunk,
  90     pa_cvolume *cvolume) {
  91
  92     pa_sink_input *si;
  93     pa_memchunk *nchunk;
  94
  95     assert(sink);
  96     assert(ss);
  97     assert(chunk);
  98
  99     if (cvolume && pa_cvolume_is_muted(cvolume))
 100         return 0;
 101
 102     if (!(si = pa_sink_input_new(sink, name, __FILE__, ss, map, cvolume, 0, PA_RESAMPLER_INVALID)))
 103         return -1;
 104
 105     si->peek = sink_input_peek;
 106     si->drop = sink_input_drop;
 107     si->kill = sink_input_kill;
 108
 109     si->userdata = nchunk = pa_xnew(pa_memchunk, 1);
 110     *nchunk = *chunk;
 111
 112     pa_memblock_ref(chunk->memblock);
 113
 114     pa_sink_notify(sink);
 115
 116     return 0;
 117 }