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
  34 typedef struct NoVoiceOut {
  35     HWVoiceOut hw;
  36     RateCtl rate;
  37 } NoVoiceOut;
  38
  39 typedef struct NoVoiceIn {
  40     HWVoiceIn hw;
  41     RateCtl rate;
  42 } NoVoiceIn;
  43
  44 static 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
  50 static 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
  60 static void no_fini_out (HWVoiceOut *hw)
  61 {
  62     (void) hw;
  63 }
  64
  65 static 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
  74 static 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
  84 static void no_fini_in (HWVoiceIn *hw)
  85 {
  86     (void) hw;
  87 }
  88
  89 static 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
  98 static 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
 107 static void *no_audio_init(Audiodev *dev)
 108 {
 109     return &no_audio_init;
 110 }
 111
 112 static void no_audio_fini (void *opaque)
 113 {
 114     (void) opaque;
 115 }
 116
 117 static 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
 129 static 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
 142 static void register_audio_none(void)
 143 {
 144     audio_driver_register(&no_audio_driver);
 145 }
 146 type_init(register_audio_none);