root / audio / noaudio.c @ 87ecb68b
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/*
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* QEMU Timer based audio emulation
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*
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* Copyright (c) 2004-2005 Vassili Karpov (malc)
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu-common.h" |
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#include "audio.h" |
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#include "qemu-timer.h" |
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#define AUDIO_CAP "noaudio" |
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#include "audio_int.h" |
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typedef struct NoVoiceOut { |
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HWVoiceOut hw; |
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int64_t old_ticks; |
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} NoVoiceOut; |
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typedef struct NoVoiceIn { |
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HWVoiceIn hw; |
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int64_t old_ticks; |
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} NoVoiceIn; |
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static int no_run_out (HWVoiceOut *hw) |
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{ |
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NoVoiceOut *no = (NoVoiceOut *) hw; |
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int live, decr, samples;
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int64_t now; |
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int64_t ticks; |
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int64_t bytes; |
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live = audio_pcm_hw_get_live_out (&no->hw); |
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if (!live) {
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return 0; |
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} |
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now = qemu_get_clock (vm_clock); |
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ticks = now - no->old_ticks; |
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bytes = (ticks * hw->info.bytes_per_second) / ticks_per_sec; |
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bytes = audio_MIN (bytes, INT_MAX); |
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samples = bytes >> hw->info.shift; |
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no->old_ticks = now; |
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decr = audio_MIN (live, samples); |
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hw->rpos = (hw->rpos + decr) % hw->samples; |
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return decr;
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} |
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static int no_write (SWVoiceOut *sw, void *buf, int len) |
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{ |
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return audio_pcm_sw_write (sw, buf, len);
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} |
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static int no_init_out (HWVoiceOut *hw, audsettings_t *as) |
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{ |
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audio_pcm_init_info (&hw->info, as); |
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hw->samples = 1024;
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return 0; |
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} |
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static void no_fini_out (HWVoiceOut *hw) |
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{ |
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(void) hw;
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} |
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static int no_ctl_out (HWVoiceOut *hw, int cmd, ...) |
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{ |
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(void) hw;
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(void) cmd;
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return 0; |
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} |
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static int no_init_in (HWVoiceIn *hw, audsettings_t *as) |
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{ |
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audio_pcm_init_info (&hw->info, as); |
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hw->samples = 1024;
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return 0; |
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} |
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static void no_fini_in (HWVoiceIn *hw) |
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{ |
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(void) hw;
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} |
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static int no_run_in (HWVoiceIn *hw) |
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{ |
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NoVoiceIn *no = (NoVoiceIn *) hw; |
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int live = audio_pcm_hw_get_live_in (hw);
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int dead = hw->samples - live;
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int samples = 0; |
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if (dead) {
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int64_t now = qemu_get_clock (vm_clock); |
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int64_t ticks = now - no->old_ticks; |
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int64_t bytes = (ticks * hw->info.bytes_per_second) / ticks_per_sec; |
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no->old_ticks = now; |
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bytes = audio_MIN (bytes, INT_MAX); |
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samples = bytes >> hw->info.shift; |
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samples = audio_MIN (samples, dead); |
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} |
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return samples;
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} |
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static int no_read (SWVoiceIn *sw, void *buf, int size) |
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{ |
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int samples = size >> sw->info.shift;
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int total = sw->hw->total_samples_captured - sw->total_hw_samples_acquired;
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int to_clear = audio_MIN (samples, total);
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audio_pcm_info_clear_buf (&sw->info, buf, to_clear); |
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return to_clear;
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} |
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static int no_ctl_in (HWVoiceIn *hw, int cmd, ...) |
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{ |
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(void) hw;
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(void) cmd;
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return 0; |
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} |
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static void *no_audio_init (void) |
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{ |
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return &no_audio_init;
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} |
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static void no_audio_fini (void *opaque) |
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{ |
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(void) opaque;
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} |
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static struct audio_pcm_ops no_pcm_ops = { |
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no_init_out, |
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no_fini_out, |
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no_run_out, |
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no_write, |
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no_ctl_out, |
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no_init_in, |
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no_fini_in, |
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no_run_in, |
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no_read, |
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no_ctl_in |
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}; |
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struct audio_driver no_audio_driver = {
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INIT_FIELD (name = ) "none",
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INIT_FIELD (descr = ) "Timer based audio emulation",
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INIT_FIELD (options = ) NULL,
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INIT_FIELD (init = ) no_audio_init, |
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INIT_FIELD (fini = ) no_audio_fini, |
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INIT_FIELD (pcm_ops = ) &no_pcm_ops, |
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INIT_FIELD (can_be_default = ) 1,
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INIT_FIELD (max_voices_out = ) INT_MAX, |
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INIT_FIELD (max_voices_in = ) INT_MAX, |
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INIT_FIELD (voice_size_out = ) sizeof (NoVoiceOut),
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INIT_FIELD (voice_size_in = ) sizeof (NoVoiceIn)
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}; |