2 * QEMU Timer based audio emulation
4 * Copyright (c) 2004-2005 Vassili Karpov (malc)
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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
24 #include "qemu/osdep.h"
25 #include "qemu-common.h"
27 #include "qemu/timer.h"
29 #define AUDIO_CAP "noaudio"
30 #include "audio_int.h"
32 typedef struct NoVoiceOut {
37 typedef struct NoVoiceIn {
42 static int no_run_out (HWVoiceOut *hw, int live)
44 NoVoiceOut *no = (NoVoiceOut *) hw;
50 now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
51 ticks = now - no->old_ticks;
52 bytes = muldiv64(ticks, hw->info.bytes_per_second, NANOSECONDS_PER_SECOND);
53 bytes = audio_MIN(bytes, INT_MAX);
54 samples = bytes >> hw->info.shift;
57 decr = audio_MIN (live, samples);
58 hw->rpos = (hw->rpos + decr) % hw->samples;
62 static int no_write (SWVoiceOut *sw, void *buf, int len)
64 return audio_pcm_sw_write(sw, buf, len);
67 static int no_init_out(HWVoiceOut *hw, struct audsettings *as, void *drv_opaque)
69 audio_pcm_init_info (&hw->info, as);
74 static void no_fini_out (HWVoiceOut *hw)
79 static int no_ctl_out (HWVoiceOut *hw, int cmd, ...)
86 static int no_init_in(HWVoiceIn *hw, struct audsettings *as, void *drv_opaque)
88 audio_pcm_init_info (&hw->info, as);
93 static void no_fini_in (HWVoiceIn *hw)
98 static int no_run_in (HWVoiceIn *hw)
100 NoVoiceIn *no = (NoVoiceIn *) hw;
101 int live = audio_pcm_hw_get_live_in (hw);
102 int dead = hw->samples - live;
106 int64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
107 int64_t ticks = now - no->old_ticks;
109 muldiv64(ticks, hw->info.bytes_per_second, NANOSECONDS_PER_SECOND);
112 bytes = audio_MIN (bytes, INT_MAX);
113 samples = bytes >> hw->info.shift;
114 samples = audio_MIN (samples, dead);
119 static int no_read (SWVoiceIn *sw, void *buf, int size)
121 /* use custom code here instead of audio_pcm_sw_read() to avoid
122 * useless resampling/mixing */
123 int samples = size >> sw->info.shift;
124 int total = sw->hw->total_samples_captured - sw->total_hw_samples_acquired;
125 int to_clear = audio_MIN (samples, total);
126 sw->total_hw_samples_acquired += total;
127 audio_pcm_info_clear_buf (&sw->info, buf, to_clear);
128 return to_clear << sw->info.shift;
131 static int no_ctl_in (HWVoiceIn *hw, int cmd, ...)
138 static void *no_audio_init (void)
140 return &no_audio_init;
143 static void no_audio_fini (void *opaque)
148 static struct audio_pcm_ops no_pcm_ops = {
149 .init_out = no_init_out,
150 .fini_out = no_fini_out,
151 .run_out = no_run_out,
153 .ctl_out = no_ctl_out,
155 .init_in = no_init_in,
156 .fini_in = no_fini_in,
162 struct audio_driver no_audio_driver = {
164 .descr = "Timer based audio emulation",
166 .init = no_audio_init,
167 .fini = no_audio_fini,
168 .pcm_ops = &no_pcm_ops,
170 .max_voices_out = INT_MAX,
171 .max_voices_in = INT_MAX,
172 .voice_size_out = sizeof (NoVoiceOut),
173 .voice_size_in = sizeof (NoVoiceIn)