LXR qemu/audio/noaudio.c

   1/*
   2 * QEMU Timer based audio emulation
   3 *
   4 * Copyright (c) 2004-2005 Vassili Karpov (malc)
   5 *
   6 * Permission is hereby granted, free of charge, to any person obtaining a copy
   7 * of this software and associated documentation files (the "Software"), to deal
   8 * in the Software without restriction, including without limitation the rights
   9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10 * copies of the Software, and to permit persons to whom the Software is
  11 * furnished to do so, subject to the following conditions:
  12 *
  13 * The above copyright notice and this permission notice shall be included in
  14 * all copies or substantial portions of the Software.
  15 *
  16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22 * THE SOFTWARE.
  23 */
  24
  25#include "qemu/osdep.h"
  26#include "qemu/host-utils.h"
  27#include "qemu/module.h"
  28#include "audio.h"
  29#include "qemu/timer.h"
  30
  31#define AUDIO_CAP "noaudio"
  32#include "audio_int.h"
  33
  34typedef struct NoVoiceOut {
  35    HWVoiceOut hw;
  36    RateCtl rate;
  37} NoVoiceOut;
  38
  39typedef struct NoVoiceIn {
  40    HWVoiceIn hw;
  41    RateCtl rate;
  42} NoVoiceIn;
  43
  44static size_t no_write(HWVoiceOut *hw, void *buf, size_t len)
  45{
  46    NoVoiceOut *no = (NoVoiceOut *) hw;
  47    return audio_rate_get_bytes(&hw->info, &no->rate, len);
  48}
  49
  50static int no_init_out(HWVoiceOut *hw, struct audsettings *as, void *drv_opaque)
  51{
  52    NoVoiceOut *no = (NoVoiceOut *) hw;
  53
  54    audio_pcm_init_info (&hw->info, as);
  55    hw->samples = 1024;
  56    audio_rate_start(&no->rate);
  57    return 0;
  58}
  59
  60static void no_fini_out (HWVoiceOut *hw)
  61{
  62    (void) hw;
  63}
  64
  65static void no_enable_out(HWVoiceOut *hw, bool enable)
  66{
  67    NoVoiceOut *no = (NoVoiceOut *) hw;
  68
  69    if (enable) {
  70        audio_rate_start(&no->rate);
  71    }
  72}
  73
  74static int no_init_in(HWVoiceIn *hw, struct audsettings *as, void *drv_opaque)
  75{
  76    NoVoiceIn *no = (NoVoiceIn *) hw;
  77
  78    audio_pcm_init_info (&hw->info, as);
  79    hw->samples = 1024;
  80    audio_rate_start(&no->rate);
  81    return 0;
  82}
  83
  84static void no_fini_in (HWVoiceIn *hw)
  85{
  86    (void) hw;
  87}
  88
  89static size_t no_read(HWVoiceIn *hw, void *buf, size_t size)
  90{
  91    NoVoiceIn *no = (NoVoiceIn *) hw;
  92    int64_t bytes = audio_rate_get_bytes(&hw->info, &no->rate, size);
  93
  94    audio_pcm_info_clear_buf(&hw->info, buf, bytes / hw->info.bytes_per_frame);
  95    return bytes;
  96}
  97
  98static void no_enable_in(HWVoiceIn *hw, bool enable)
  99{
 100    NoVoiceIn *no = (NoVoiceIn *) hw;
 101
 102    if (enable) {
 103        audio_rate_start(&no->rate);
 104    }
 105}
 106
 107static void *no_audio_init(Audiodev *dev)
 108{
 109    return &no_audio_init;
 110}
 111
 112static void no_audio_fini (void *opaque)
 113{
 114    (void) opaque;
 115}
 116
 117static struct audio_pcm_ops no_pcm_ops = {
 118    .init_out = no_init_out,
 119    .fini_out = no_fini_out,
 120    .write    = no_write,
 121    .enable_out = no_enable_out,
 122
 123    .init_in  = no_init_in,
 124    .fini_in  = no_fini_in,
 125    .read     = no_read,
 126    .enable_in = no_enable_in
 127};
 128
 129static struct audio_driver no_audio_driver = {
 130    .name           = "none",
 131    .descr          = "Timer based audio emulation",
 132    .init           = no_audio_init,
 133    .fini           = no_audio_fini,
 134    .pcm_ops        = &no_pcm_ops,
 135    .can_be_default = 1,
 136    .max_voices_out = INT_MAX,
 137    .max_voices_in  = INT_MAX,
 138    .voice_size_out = sizeof (NoVoiceOut),
 139    .voice_size_in  = sizeof (NoVoiceIn)
 140};
 141
 142static void register_audio_none(void)
 143{
 144    audio_driver_register(&no_audio_driver);
 145}
 146type_init(register_audio_none);
 147