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 #include "qemu-common.h" 25 #include "audio.h" 26 #include "qemu-timer.h" 27 28 #define AUDIO_CAP "noaudio" 29 #include "audio_int.h" 30 31 typedef struct NoVoiceOut { 32 HWVoiceOut hw; 33 int64_t old_ticks; 34 } NoVoiceOut; 35 36 typedef struct NoVoiceIn { 37 HWVoiceIn hw; 38 int64_t old_ticks; 39 } NoVoiceIn; 40 41 static int no_run_out (HWVoiceOut *hw) 42 { 43 NoVoiceOut *no = (NoVoiceOut *) hw; 44 int live, decr, samples; 45 int64_t now; 46 int64_t ticks; 47 int64_t bytes; 48 49 live = audio_pcm_hw_get_live_out (&no->hw); 50 if (!live) { 51 return 0; 52 } 53 54 now = qemu_get_clock (vm_clock); 55 ticks = now - no->old_ticks; 56 bytes = (ticks * hw->info.bytes_per_second) / get_ticks_per_sec(); 57 bytes = audio_MIN (bytes, INT_MAX); 58 samples = bytes >> hw->info.shift; 59 60 no->old_ticks = now; 61 decr = audio_MIN (live, samples); 62 hw->rpos = (hw->rpos + decr) % hw->samples; 63 return decr; 64 } 65 66 static int no_write (SWVoiceOut *sw, void *buf, int len) 67 { 68 return audio_pcm_sw_write (sw, buf, len); 69 } 70 71 static int no_init_out (HWVoiceOut *hw, struct audsettings *as) 72 { 73 audio_pcm_init_info (&hw->info, as); 74 hw->samples = 1024; 75 return 0; 76 } 77 78 static void no_fini_out (HWVoiceOut *hw) 79 { 80 (void) hw; 81 } 82 83 static int no_ctl_out (HWVoiceOut *hw, int cmd, ...) 84 { 85 (void) hw; 86 (void) cmd; 87 return 0; 88 } 89 90 static int no_init_in (HWVoiceIn *hw, struct audsettings *as) 91 { 92 audio_pcm_init_info (&hw->info, as); 93 hw->samples = 1024; 94 return 0; 95 } 96 97 static void no_fini_in (HWVoiceIn *hw) 98 { 99 (void) hw; 100 } 101 102 static int no_run_in (HWVoiceIn *hw) 103 { 104 NoVoiceIn *no = (NoVoiceIn *) hw; 105 int live = audio_pcm_hw_get_live_in (hw); 106 int dead = hw->samples - live; 107 int samples = 0; 108 109 if (dead) { 110 int64_t now = qemu_get_clock (vm_clock); 111 int64_t ticks = now - no->old_ticks; 112 int64_t bytes = (ticks * hw->info.bytes_per_second) / get_ticks_per_sec(); 113 114 no->old_ticks = now; 115 bytes = audio_MIN (bytes, INT_MAX); 116 samples = bytes >> hw->info.shift; 117 samples = audio_MIN (samples, dead); 118 } 119 return samples; 120 } 121 122 static int no_read (SWVoiceIn *sw, void *buf, int size) 123 { 124 int samples = size >> sw->info.shift; 125 int total = sw->hw->total_samples_captured - sw->total_hw_samples_acquired; 126 int to_clear = audio_MIN (samples, total); 127 audio_pcm_info_clear_buf (&sw->info, buf, to_clear); 128 return to_clear; 129 } 130 131 static int no_ctl_in (HWVoiceIn *hw, int cmd, ...) 132 { 133 (void) hw; 134 (void) cmd; 135 return 0; 136 } 137 138 static void *no_audio_init (void) 139 { 140 return &no_audio_init; 141 } 142 143 static void no_audio_fini (void *opaque) 144 { 145 (void) opaque; 146 } 147 148 static struct audio_pcm_ops no_pcm_ops = { 149 .init_out = no_init_out, 150 .fini_out = no_fini_out, 151 .run_out = no_run_out, 152 .write = no_write, 153 .ctl_out = no_ctl_out, 154 155 .init_in = no_init_in, 156 .fini_in = no_fini_in, 157 .run_in = no_run_in, 158 .read = no_read, 159 .ctl_in = no_ctl_in 160 }; 161 162 struct audio_driver no_audio_driver = { 163 .name = "none", 164 .descr = "Timer based audio emulation", 165 .options = NULL, 166 .init = no_audio_init, 167 .fini = no_audio_fini, 168 .pcm_ops = &no_pcm_ops, 169 .can_be_default = 1, 170 .max_voices_out = INT_MAX, 171 .max_voices_in = INT_MAX, 172 .voice_size_out = sizeof (NoVoiceOut), 173 .voice_size_in = sizeof (NoVoiceIn) 174 }; 175