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/*
* QEMU NULL audio output driver
*
* Copyright (c) 2004 Vassili Karpov (malc)
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "vl.h"
#include "audio/audio_int.h"
typedef struct NoVoice {
HWVoice hw;
int64_t old_ticks;
} NoVoice;
#define dolog(...) AUD_log ("noaudio", __VA_ARGS__)
#ifdef DEBUG
#define ldebug(...) dolog (__VA_ARGS__)
#else
#define ldebug(...)
#endif
static void no_hw_run (HWVoice *hw)
{
NoVoice *no = (NoVoice *) hw;
int rpos, live, decr, samples;
st_sample_t *src;
int64_t now = qemu_get_clock (vm_clock);
int64_t ticks = now - no->old_ticks;
int64_t bytes = (ticks * hw->bytes_per_second) / ticks_per_sec;
if (bytes > INT_MAX)
samples = INT_MAX >> hw->shift;
else
samples = bytes >> hw->shift;
live = pcm_hw_get_live (hw);
if (live <= 0)
return;
no->old_ticks = now;
decr = audio_MIN (live, samples);
samples = decr;
rpos = hw->rpos;
while (samples) {
int left_till_end_samples = hw->samples - rpos;
int convert_samples = audio_MIN (samples, left_till_end_samples);
src = advance (hw->mix_buf, rpos * sizeof (st_sample_t));
memset (src, 0, convert_samples * sizeof (st_sample_t));
rpos = (rpos + convert_samples) % hw->samples;
samples -= convert_samples;
}
pcm_hw_dec_live (hw, decr);
hw->rpos = rpos;
}
static int no_hw_write (SWVoice *sw, void *buf, int len)
{
return pcm_hw_write (sw, buf, len);
}
static int no_hw_init (HWVoice *hw, int freq, int nchannels, audfmt_e fmt)
{
hw->freq = freq;
hw->nchannels = nchannels;
hw->fmt = fmt;
hw->bufsize = 4096;
return 0;
}
static void no_hw_fini (HWVoice *hw)
{
(void) hw;
}
static int no_hw_ctl (HWVoice *hw, int cmd, ...)
{
(void) hw;
(void) cmd;
return 0;
}
static void *no_audio_init (void)
{
return &no_audio_init;
}
static void no_audio_fini (void *opaque)
{
}
struct pcm_ops no_pcm_ops = {
no_hw_init,
no_hw_fini,
no_hw_run,
no_hw_write,
no_hw_ctl
};
struct audio_output_driver no_output_driver = {
"none",
no_audio_init,
no_audio_fini,
&no_pcm_ops,
1,
1,
sizeof (NoVoice)
};
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