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 int64_t old_ticks; 37 } NoVoiceOut; 38 39 typedef struct NoVoiceIn { 40 HWVoiceIn hw; 41 int64_t old_ticks; 42 } NoVoiceIn; 43 44 static int no_run_out (HWVoiceOut *hw, int live) 45 { 46 NoVoiceOut *no = (NoVoiceOut *) hw; 47 int decr, samples; 48 int64_t now; 49 int64_t ticks; 50 int64_t bytes; 51 52 now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 53 ticks = now - no->old_ticks; 54 bytes = muldiv64(ticks, hw->info.bytes_per_second, NANOSECONDS_PER_SECOND); 55 bytes = audio_MIN(bytes, INT_MAX); 56 samples = bytes >> hw->info.shift; 57 58 no->old_ticks = now; 59 decr = audio_MIN (live, samples); 60 hw->rpos = (hw->rpos + decr) % hw->samples; 61 return decr; 62 } 63 64 static int no_write (SWVoiceOut *sw, void *buf, int len) 65 { 66 return audio_pcm_sw_write(sw, buf, len); 67 } 68 69 static int no_init_out(HWVoiceOut *hw, struct audsettings *as, void *drv_opaque) 70 { 71 audio_pcm_init_info (&hw->info, as); 72 hw->samples = 1024; 73 return 0; 74 } 75 76 static void no_fini_out (HWVoiceOut *hw) 77 { 78 (void) hw; 79 } 80 81 static int no_ctl_out (HWVoiceOut *hw, int cmd, ...) 82 { 83 (void) hw; 84 (void) cmd; 85 return 0; 86 } 87 88 static int no_init_in(HWVoiceIn *hw, struct audsettings *as, void *drv_opaque) 89 { 90 audio_pcm_init_info (&hw->info, as); 91 hw->samples = 1024; 92 return 0; 93 } 94 95 static void no_fini_in (HWVoiceIn *hw) 96 { 97 (void) hw; 98 } 99 100 static int no_run_in (HWVoiceIn *hw) 101 { 102 NoVoiceIn *no = (NoVoiceIn *) hw; 103 int live = audio_pcm_hw_get_live_in (hw); 104 int dead = hw->samples - live; 105 int samples = 0; 106 107 if (dead) { 108 int64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 109 int64_t ticks = now - no->old_ticks; 110 int64_t bytes = 111 muldiv64(ticks, hw->info.bytes_per_second, NANOSECONDS_PER_SECOND); 112 113 no->old_ticks = now; 114 bytes = audio_MIN (bytes, INT_MAX); 115 samples = bytes >> hw->info.shift; 116 samples = audio_MIN (samples, dead); 117 } 118 return samples; 119 } 120 121 static int no_read (SWVoiceIn *sw, void *buf, int size) 122 { 123 /* use custom code here instead of audio_pcm_sw_read() to avoid 124 * useless resampling/mixing */ 125 int samples = size >> sw->info.shift; 126 int total = sw->hw->total_samples_captured - sw->total_hw_samples_acquired; 127 int to_clear = audio_MIN (samples, total); 128 sw->total_hw_samples_acquired += total; 129 audio_pcm_info_clear_buf (&sw->info, buf, to_clear); 130 return to_clear << sw->info.shift; 131 } 132 133 static int no_ctl_in (HWVoiceIn *hw, int cmd, ...) 134 { 135 (void) hw; 136 (void) cmd; 137 return 0; 138 } 139 140 static void *no_audio_init(Audiodev *dev) 141 { 142 return &no_audio_init; 143 } 144 145 static void no_audio_fini (void *opaque) 146 { 147 (void) opaque; 148 } 149 150 static struct audio_pcm_ops no_pcm_ops = { 151 .init_out = no_init_out, 152 .fini_out = no_fini_out, 153 .run_out = no_run_out, 154 .write = no_write, 155 .ctl_out = no_ctl_out, 156 157 .init_in = no_init_in, 158 .fini_in = no_fini_in, 159 .run_in = no_run_in, 160 .read = no_read, 161 .ctl_in = no_ctl_in 162 }; 163 164 static struct audio_driver no_audio_driver = { 165 .name = "none", 166 .descr = "Timer based audio emulation", 167 .init = no_audio_init, 168 .fini = no_audio_fini, 169 .pcm_ops = &no_pcm_ops, 170 .can_be_default = 1, 171 .max_voices_out = INT_MAX, 172 .max_voices_in = INT_MAX, 173 .voice_size_out = sizeof (NoVoiceOut), 174 .voice_size_in = sizeof (NoVoiceIn) 175 }; 176 177 static void register_audio_none(void) 178 { 179 audio_driver_register(&no_audio_driver); 180 } 181 type_init(register_audio_none); 182