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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:
1.1.1.2 root 41: static int no_run_out (HWVoiceOut *hw)
42: {
43: NoVoiceOut *no = (NoVoiceOut *) hw;
44: int live, decr, samples;
1.1.1.3 root 45: int64_t now;
46: int64_t ticks;
47: int64_t bytes;
1.1 root 48:
1.1.1.2 root 49: live = audio_pcm_hw_get_live_out (&no->hw);
50: if (!live) {
51: return 0;
52: }
1.1 root 53:
1.1.1.3 root 54: now = qemu_get_clock (vm_clock);
55: ticks = now - no->old_ticks;
56: bytes = (ticks * hw->info.bytes_per_second) / ticks_per_sec;
57: bytes = audio_MIN (bytes, INT_MAX);
58: samples = bytes >> hw->info.shift;
59:
1.1 root 60: no->old_ticks = now;
61: decr = audio_MIN (live, samples);
1.1.1.2 root 62: hw->rpos = (hw->rpos + decr) % hw->samples;
63: return decr;
64: }
1.1 root 65:
1.1.1.2 root 66: static int no_write (SWVoiceOut *sw, void *buf, int len)
67: {
68: return audio_pcm_sw_write (sw, buf, len);
69: }
1.1 root 70:
1.1.1.2 root 71: static int no_init_out (HWVoiceOut *hw, audsettings_t *as)
72: {
1.1.1.3 root 73: audio_pcm_init_info (&hw->info, as);
1.1.1.2 root 74: hw->samples = 1024;
75: return 0;
76: }
1.1 root 77:
1.1.1.2 root 78: static void no_fini_out (HWVoiceOut *hw)
79: {
80: (void) hw;
1.1 root 81: }
82:
1.1.1.2 root 83: static int no_ctl_out (HWVoiceOut *hw, int cmd, ...)
1.1 root 84: {
1.1.1.2 root 85: (void) hw;
86: (void) cmd;
87: return 0;
1.1 root 88: }
89:
1.1.1.2 root 90: static int no_init_in (HWVoiceIn *hw, audsettings_t *as)
1.1 root 91: {
1.1.1.3 root 92: audio_pcm_init_info (&hw->info, as);
1.1.1.2 root 93: hw->samples = 1024;
1.1 root 94: return 0;
95: }
96:
1.1.1.2 root 97: static void no_fini_in (HWVoiceIn *hw)
1.1 root 98: {
99: (void) hw;
100: }
101:
1.1.1.2 root 102: static int no_run_in (HWVoiceIn *hw)
103: {
104: NoVoiceIn *no = (NoVoiceIn *) hw;
105: int live = audio_pcm_hw_get_live_in (hw);
106: int dead = hw->samples - live;
1.1.1.3 root 107: int samples = 0;
1.1.1.2 root 108:
1.1.1.3 root 109: if (dead) {
110: int64_t now = qemu_get_clock (vm_clock);
111: int64_t ticks = now - no->old_ticks;
112: int64_t bytes = (ticks * hw->info.bytes_per_second) / ticks_per_sec;
1.1.1.2 root 113:
1.1.1.3 root 114: no->old_ticks = now;
115: bytes = audio_MIN (bytes, INT_MAX);
116: samples = bytes >> hw->info.shift;
117: samples = audio_MIN (samples, dead);
118: }
1.1.1.2 root 119: return samples;
120: }
121:
122: static int no_read (SWVoiceIn *sw, void *buf, int size)
123: {
124: int samples = size >> sw->info.shift;
125: int total = sw->hw->total_samples_captured - sw->total_hw_samples_acquired;
126: int to_clear = audio_MIN (samples, total);
127: audio_pcm_info_clear_buf (&sw->info, buf, to_clear);
128: return to_clear;
129: }
130:
131: static int no_ctl_in (HWVoiceIn *hw, int cmd, ...)
1.1 root 132: {
133: (void) hw;
134: (void) cmd;
135: return 0;
136: }
137:
138: static void *no_audio_init (void)
139: {
140: return &no_audio_init;
141: }
142:
143: static void no_audio_fini (void *opaque)
144: {
1.1.1.2 root 145: (void) opaque;
1.1 root 146: }
147:
1.1.1.2 root 148: static struct audio_pcm_ops no_pcm_ops = {
149: no_init_out,
150: no_fini_out,
151: no_run_out,
152: no_write,
153: no_ctl_out,
154:
155: no_init_in,
156: no_fini_in,
157: no_run_in,
158: no_read,
159: no_ctl_in
1.1 root 160: };
161:
1.1.1.2 root 162: struct audio_driver no_audio_driver = {
163: INIT_FIELD (name = ) "none",
164: INIT_FIELD (descr = ) "Timer based audio emulation",
165: INIT_FIELD (options = ) NULL,
166: INIT_FIELD (init = ) no_audio_init,
167: INIT_FIELD (fini = ) no_audio_fini,
168: INIT_FIELD (pcm_ops = ) &no_pcm_ops,
169: INIT_FIELD (can_be_default = ) 1,
170: INIT_FIELD (max_voices_out = ) INT_MAX,
171: INIT_FIELD (max_voices_in = ) INT_MAX,
172: INIT_FIELD (voice_size_out = ) sizeof (NoVoiceOut),
173: INIT_FIELD (voice_size_in = ) sizeof (NoVoiceIn)
1.1 root 174: };
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