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1.1 root 1: /* 1.1.1.2 ! root 2: * QEMU Timer based audio emulation ! 3: * ! 4: * Copyright (c) 2004-2005 Vassili Karpov (malc) ! 5: * 1.1 root 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: 1.1.1.2 ! root 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; 1.1 root 33: 1.1.1.2 ! root 34: typedef struct NoVoiceIn { ! 35: HWVoiceIn hw; 1.1 root 36: int64_t old_ticks; 1.1.1.2 ! root 37: } NoVoiceIn; 1.1 root 38: 1.1.1.2 ! root 39: static int no_run_out (HWVoiceOut *hw) ! 40: { ! 41: NoVoiceOut *no = (NoVoiceOut *) hw; ! 42: int live, decr, samples; 1.1 root 43: int64_t now = qemu_get_clock (vm_clock); 44: int64_t ticks = now - no->old_ticks; 1.1.1.2 ! root 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: } 1.1 root 53: 1.1.1.2 ! root 54: live = audio_pcm_hw_get_live_out (&no->hw); ! 55: if (!live) { ! 56: return 0; ! 57: } 1.1 root 58: 59: no->old_ticks = now; 60: decr = audio_MIN (live, samples); 1.1.1.2 ! root 61: hw->rpos = (hw->rpos + decr) % hw->samples; ! 62: return decr; ! 63: } 1.1 root 64: 1.1.1.2 ! root 65: static int no_write (SWVoiceOut *sw, void *buf, int len) ! 66: { ! 67: return audio_pcm_sw_write (sw, buf, len); ! 68: } 1.1 root 69: 1.1.1.2 ! root 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: } 1.1 root 76: 1.1.1.2 ! root 77: static void no_fini_out (HWVoiceOut *hw) ! 78: { ! 79: (void) hw; 1.1 root 80: } 81: 1.1.1.2 ! root 82: static int no_ctl_out (HWVoiceOut *hw, int cmd, ...) 1.1 root 83: { 1.1.1.2 ! root 84: (void) hw; ! 85: (void) cmd; ! 86: return 0; 1.1 root 87: } 88: 1.1.1.2 ! root 89: static int no_init_in (HWVoiceIn *hw, audsettings_t *as) 1.1 root 90: { 1.1.1.2 ! root 91: audio_pcm_init_info (&hw->info, as, 0); ! 92: hw->samples = 1024; 1.1 root 93: return 0; 94: } 95: 1.1.1.2 ! root 96: static void no_fini_in (HWVoiceIn *hw) 1.1 root 97: { 98: (void) hw; 99: } 100: 1.1.1.2 ! root 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, ...) 1.1 root 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: { 1.1.1.2 ! root 141: (void) opaque; 1.1 root 142: } 143: 1.1.1.2 ! root 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 1.1 root 156: }; 157: 1.1.1.2 ! root 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) 1.1 root 170: };
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