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