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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;
1.1.1.3 ! root 43: int64_t now;
! 44: int64_t ticks;
! 45: int64_t bytes;
1.1 root 46:
1.1.1.2 root 47: live = audio_pcm_hw_get_live_out (&no->hw);
48: if (!live) {
49: return 0;
50: }
1.1 root 51:
1.1.1.3 ! root 52: now = qemu_get_clock (vm_clock);
! 53: ticks = now - no->old_ticks;
! 54: bytes = (ticks * hw->info.bytes_per_second) / ticks_per_sec;
! 55: bytes = audio_MIN (bytes, INT_MAX);
! 56: samples = bytes >> hw->info.shift;
! 57:
1.1 root 58: no->old_ticks = now;
59: decr = audio_MIN (live, samples);
1.1.1.2 root 60: hw->rpos = (hw->rpos + decr) % hw->samples;
61: return decr;
62: }
1.1 root 63:
1.1.1.2 root 64: static int no_write (SWVoiceOut *sw, void *buf, int len)
65: {
66: return audio_pcm_sw_write (sw, buf, len);
67: }
1.1 root 68:
1.1.1.2 root 69: static int no_init_out (HWVoiceOut *hw, audsettings_t *as)
70: {
1.1.1.3 ! root 71: audio_pcm_init_info (&hw->info, as);
1.1.1.2 root 72: hw->samples = 1024;
73: return 0;
74: }
1.1 root 75:
1.1.1.2 root 76: static void no_fini_out (HWVoiceOut *hw)
77: {
78: (void) hw;
1.1 root 79: }
80:
1.1.1.2 root 81: static int no_ctl_out (HWVoiceOut *hw, int cmd, ...)
1.1 root 82: {
1.1.1.2 root 83: (void) hw;
84: (void) cmd;
85: return 0;
1.1 root 86: }
87:
1.1.1.2 root 88: static int no_init_in (HWVoiceIn *hw, audsettings_t *as)
1.1 root 89: {
1.1.1.3 ! root 90: audio_pcm_init_info (&hw->info, as);
1.1.1.2 root 91: hw->samples = 1024;
1.1 root 92: return 0;
93: }
94:
1.1.1.2 root 95: static void no_fini_in (HWVoiceIn *hw)
1.1 root 96: {
97: (void) hw;
98: }
99:
1.1.1.2 root 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;
1.1.1.3 ! root 105: int samples = 0;
1.1.1.2 root 106:
1.1.1.3 ! root 107: if (dead) {
! 108: int64_t now = qemu_get_clock (vm_clock);
! 109: int64_t ticks = now - no->old_ticks;
! 110: int64_t bytes = (ticks * hw->info.bytes_per_second) / ticks_per_sec;
1.1.1.2 root 111:
1.1.1.3 ! root 112: no->old_ticks = now;
! 113: bytes = audio_MIN (bytes, INT_MAX);
! 114: samples = bytes >> hw->info.shift;
! 115: samples = audio_MIN (samples, dead);
! 116: }
1.1.1.2 root 117: return samples;
118: }
119:
120: static int no_read (SWVoiceIn *sw, void *buf, int size)
121: {
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);
125: audio_pcm_info_clear_buf (&sw->info, buf, to_clear);
126: return to_clear;
127: }
128:
129: static int no_ctl_in (HWVoiceIn *hw, int cmd, ...)
1.1 root 130: {
131: (void) hw;
132: (void) cmd;
133: return 0;
134: }
135:
136: static void *no_audio_init (void)
137: {
138: return &no_audio_init;
139: }
140:
141: static void no_audio_fini (void *opaque)
142: {
1.1.1.2 root 143: (void) opaque;
1.1 root 144: }
145:
1.1.1.2 root 146: static struct audio_pcm_ops no_pcm_ops = {
147: no_init_out,
148: no_fini_out,
149: no_run_out,
150: no_write,
151: no_ctl_out,
152:
153: no_init_in,
154: no_fini_in,
155: no_run_in,
156: no_read,
157: no_ctl_in
1.1 root 158: };
159:
1.1.1.2 root 160: struct audio_driver no_audio_driver = {
161: INIT_FIELD (name = ) "none",
162: INIT_FIELD (descr = ) "Timer based audio emulation",
163: INIT_FIELD (options = ) NULL,
164: INIT_FIELD (init = ) no_audio_init,
165: INIT_FIELD (fini = ) no_audio_fini,
166: INIT_FIELD (pcm_ops = ) &no_pcm_ops,
167: INIT_FIELD (can_be_default = ) 1,
168: INIT_FIELD (max_voices_out = ) INT_MAX,
169: INIT_FIELD (max_voices_in = ) INT_MAX,
170: INIT_FIELD (voice_size_out = ) sizeof (NoVoiceOut),
171: INIT_FIELD (voice_size_in = ) sizeof (NoVoiceIn)
1.1 root 172: };
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