150 lines
3.9 KiB
C
150 lines
3.9 KiB
C
/*
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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/osdep.h"
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#include "qemu/host-utils.h"
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#include "qemu/module.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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RateCtl rate;
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} NoVoiceOut;
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typedef struct NoVoiceIn {
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HWVoiceIn hw;
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RateCtl rate;
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} NoVoiceIn;
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static size_t no_write(HWVoiceOut *hw, void *buf, size_t len)
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{
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NoVoiceOut *no = (NoVoiceOut *) hw;
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return audio_rate_get_bytes(&no->rate, &hw->info, len);
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}
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static int no_init_out(HWVoiceOut *hw, struct audsettings *as, void *drv_opaque)
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{
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NoVoiceOut *no = (NoVoiceOut *) hw;
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audio_pcm_init_info (&hw->info, as);
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hw->samples = 1024;
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audio_rate_start(&no->rate);
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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 void no_enable_out(HWVoiceOut *hw, bool enable)
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{
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NoVoiceOut *no = (NoVoiceOut *) hw;
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if (enable) {
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audio_rate_start(&no->rate);
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}
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}
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static int no_init_in(HWVoiceIn *hw, struct audsettings *as, void *drv_opaque)
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{
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NoVoiceIn *no = (NoVoiceIn *) hw;
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audio_pcm_init_info (&hw->info, as);
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hw->samples = 1024;
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audio_rate_start(&no->rate);
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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 size_t no_read(HWVoiceIn *hw, void *buf, size_t size)
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{
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NoVoiceIn *no = (NoVoiceIn *) hw;
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int64_t bytes = audio_rate_get_bytes(&no->rate, &hw->info, size);
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audio_pcm_info_clear_buf(&hw->info, buf, bytes / hw->info.bytes_per_frame);
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return bytes;
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}
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static void no_enable_in(HWVoiceIn *hw, bool enable)
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{
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NoVoiceIn *no = (NoVoiceIn *) hw;
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if (enable) {
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audio_rate_start(&no->rate);
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}
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}
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static void *no_audio_init(Audiodev *dev)
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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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.init_out = no_init_out,
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.fini_out = no_fini_out,
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.write = no_write,
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.buffer_get_free = audio_generic_buffer_get_free,
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.run_buffer_out = audio_generic_run_buffer_out,
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.enable_out = no_enable_out,
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.init_in = no_init_in,
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.fini_in = no_fini_in,
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.read = no_read,
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.run_buffer_in = audio_generic_run_buffer_in,
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.enable_in = no_enable_in
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};
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static struct audio_driver no_audio_driver = {
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.name = "none",
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.descr = "Timer based audio emulation",
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.init = no_audio_init,
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.fini = no_audio_fini,
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.pcm_ops = &no_pcm_ops,
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.can_be_default = 1,
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.max_voices_out = INT_MAX,
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.max_voices_in = INT_MAX,
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.voice_size_out = sizeof (NoVoiceOut),
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.voice_size_in = sizeof (NoVoiceIn)
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};
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static void register_audio_none(void)
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{
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audio_driver_register(&no_audio_driver);
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}
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type_init(register_audio_none);
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