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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: */
1.1.1.4 root 24: #include "qemu-common.h"
25: #include "audio.h"
26: #include "qemu-timer.h"
1.1 root 27:
1.1.1.2 root 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;
1.1 root 35:
1.1.1.2 root 36: typedef struct NoVoiceIn {
37: HWVoiceIn hw;
1.1 root 38: int64_t old_ticks;
1.1.1.2 root 39: } NoVoiceIn;
1.1 root 40:
1.1.1.6 root 41: static int no_run_out (HWVoiceOut *hw, int live)
1.1.1.2 root 42: {
43: NoVoiceOut *no = (NoVoiceOut *) hw;
1.1.1.6 root 44: int decr, samples;
1.1.1.3 root 45: int64_t now;
46: int64_t ticks;
47: int64_t bytes;
1.1 root 48:
1.1.1.8 ! root 49: now = qemu_get_clock_ns (vm_clock);
1.1.1.3 root 50: ticks = now - no->old_ticks;
1.1.1.6 root 51: bytes = muldiv64 (ticks, hw->info.bytes_per_second, get_ticks_per_sec ());
1.1.1.3 root 52: bytes = audio_MIN (bytes, INT_MAX);
53: samples = bytes >> hw->info.shift;
54:
1.1 root 55: no->old_ticks = now;
56: decr = audio_MIN (live, samples);
1.1.1.2 root 57: hw->rpos = (hw->rpos + decr) % hw->samples;
58: return decr;
59: }
1.1 root 60:
1.1.1.2 root 61: static int no_write (SWVoiceOut *sw, void *buf, int len)
62: {
63: return audio_pcm_sw_write (sw, buf, len);
64: }
1.1 root 65:
1.1.1.5 root 66: static int no_init_out (HWVoiceOut *hw, struct audsettings *as)
1.1.1.2 root 67: {
1.1.1.3 root 68: audio_pcm_init_info (&hw->info, as);
1.1.1.2 root 69: hw->samples = 1024;
70: return 0;
71: }
1.1 root 72:
1.1.1.2 root 73: static void no_fini_out (HWVoiceOut *hw)
74: {
75: (void) hw;
1.1 root 76: }
77:
1.1.1.2 root 78: static int no_ctl_out (HWVoiceOut *hw, int cmd, ...)
1.1 root 79: {
1.1.1.2 root 80: (void) hw;
81: (void) cmd;
82: return 0;
1.1 root 83: }
84:
1.1.1.5 root 85: static int no_init_in (HWVoiceIn *hw, struct audsettings *as)
1.1 root 86: {
1.1.1.3 root 87: audio_pcm_init_info (&hw->info, as);
1.1.1.2 root 88: hw->samples = 1024;
1.1 root 89: return 0;
90: }
91:
1.1.1.2 root 92: static void no_fini_in (HWVoiceIn *hw)
1.1 root 93: {
94: (void) hw;
95: }
96:
1.1.1.2 root 97: static int no_run_in (HWVoiceIn *hw)
98: {
99: NoVoiceIn *no = (NoVoiceIn *) hw;
100: int live = audio_pcm_hw_get_live_in (hw);
101: int dead = hw->samples - live;
1.1.1.3 root 102: int samples = 0;
1.1.1.2 root 103:
1.1.1.3 root 104: if (dead) {
1.1.1.8 ! root 105: int64_t now = qemu_get_clock_ns (vm_clock);
1.1.1.3 root 106: int64_t ticks = now - no->old_ticks;
1.1.1.6 root 107: int64_t bytes =
108: muldiv64 (ticks, hw->info.bytes_per_second, get_ticks_per_sec ());
1.1.1.2 root 109:
1.1.1.3 root 110: no->old_ticks = now;
111: bytes = audio_MIN (bytes, INT_MAX);
112: samples = bytes >> hw->info.shift;
113: samples = audio_MIN (samples, dead);
114: }
1.1.1.2 root 115: return samples;
116: }
117:
118: static int no_read (SWVoiceIn *sw, void *buf, int size)
119: {
1.1.1.7 root 120: /* use custom code here instead of audio_pcm_sw_read() to avoid
121: * useless resampling/mixing */
1.1.1.2 root 122: int samples = size >> sw->info.shift;
123: int total = sw->hw->total_samples_captured - sw->total_hw_samples_acquired;
124: int to_clear = audio_MIN (samples, total);
1.1.1.7 root 125: sw->total_hw_samples_acquired += total;
1.1.1.2 root 126: audio_pcm_info_clear_buf (&sw->info, buf, to_clear);
1.1.1.7 root 127: return to_clear << sw->info.shift;
1.1.1.2 root 128: }
129:
130: static int no_ctl_in (HWVoiceIn *hw, int cmd, ...)
1.1 root 131: {
132: (void) hw;
133: (void) cmd;
134: return 0;
135: }
136:
137: static void *no_audio_init (void)
138: {
139: return &no_audio_init;
140: }
141:
142: static void no_audio_fini (void *opaque)
143: {
1.1.1.2 root 144: (void) opaque;
1.1 root 145: }
146:
1.1.1.2 root 147: static struct audio_pcm_ops no_pcm_ops = {
1.1.1.6 root 148: .init_out = no_init_out,
149: .fini_out = no_fini_out,
150: .run_out = no_run_out,
151: .write = no_write,
152: .ctl_out = no_ctl_out,
153:
154: .init_in = no_init_in,
155: .fini_in = no_fini_in,
156: .run_in = no_run_in,
157: .read = no_read,
158: .ctl_in = no_ctl_in
1.1 root 159: };
160:
1.1.1.2 root 161: struct audio_driver no_audio_driver = {
1.1.1.6 root 162: .name = "none",
163: .descr = "Timer based audio emulation",
164: .options = NULL,
165: .init = no_audio_init,
166: .fini = no_audio_fini,
167: .pcm_ops = &no_pcm_ops,
168: .can_be_default = 1,
169: .max_voices_out = INT_MAX,
170: .max_voices_in = INT_MAX,
171: .voice_size_out = sizeof (NoVoiceOut),
172: .voice_size_in = sizeof (NoVoiceIn)
1.1 root 173: };
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