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
26 #define AUDIO_CAP "noaudio"
27 #include "audio_int.h"
29 typedef struct NoVoiceOut {
34 typedef struct NoVoiceIn {
39 static int no_run_out (HWVoiceOut *hw)
41 NoVoiceOut *no = (NoVoiceOut *) hw;
42 int live, decr, samples;
43 int64_t now = qemu_get_clock (vm_clock);
44 int64_t ticks = now - no->old_ticks;
45 int64_t bytes = (ticks * hw->info.bytes_per_second) / ticks_per_sec;
47 if (bytes > INT_MAX) {
48 samples = INT_MAX >> hw->info.shift;
51 samples = bytes >> hw->info.shift;
54 live = audio_pcm_hw_get_live_out (&no->hw);
60 decr = audio_MIN (live, samples);
61 hw->rpos = (hw->rpos + decr) % hw->samples;
65 static int no_write (SWVoiceOut *sw, void *buf, int len)
67 return audio_pcm_sw_write (sw, buf, len);
70 static int no_init_out (HWVoiceOut *hw, int freq,
71 int nchannels, audfmt_e fmt)
73 audio_pcm_init_info (&hw->info, freq, nchannels, fmt, 0);
78 static void no_fini_out (HWVoiceOut *hw)
83 static int no_ctl_out (HWVoiceOut *hw, int cmd, ...)
90 static int no_init_in (HWVoiceIn *hw, int freq,
91 int nchannels, audfmt_e fmt)
93 audio_pcm_init_info (&hw->info, freq, nchannels, fmt, 0);
98 static void no_fini_in (HWVoiceIn *hw)
103 static int no_run_in (HWVoiceIn *hw)
105 NoVoiceIn *no = (NoVoiceIn *) hw;
106 int64_t now = qemu_get_clock (vm_clock);
107 int64_t ticks = now - no->old_ticks;
108 int64_t bytes = (ticks * hw->info.bytes_per_second) / ticks_per_sec;
109 int live = audio_pcm_hw_get_live_in (hw);
110 int dead = hw->samples - live;
113 bytes = audio_MIN (bytes, INT_MAX);
114 samples = bytes >> hw->info.shift;
115 samples = audio_MIN (samples, dead);
120 static int no_read (SWVoiceIn *sw, void *buf, int size)
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);
129 static int no_ctl_in (HWVoiceIn *hw, int cmd, ...)
136 static void *no_audio_init (void)
138 return &no_audio_init;
141 static void no_audio_fini (void *opaque)
146 static struct audio_pcm_ops no_pcm_ops = {
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)