7372f88dc1
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1133 c046a42c-6fe2-441c-8c8c-71466251a162
131 lines
3.2 KiB
C
131 lines
3.2 KiB
C
/*
|
|
* 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;
|
|
uint8_t *dst;
|
|
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)
|
|
{
|
|
NoVoice *no = (NoVoice *) hw;
|
|
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)
|
|
};
|