mirror of
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fe2cece60e
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1165 c046a42c-6fe2-441c-8c8c-71466251a162
129 lines
3.2 KiB
C
129 lines
3.2 KiB
C
/*
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* QEMU NULL audio output driver
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*
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* Copyright (c) 2004 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 "vl.h"
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#include "audio/audio_int.h"
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typedef struct NoVoice {
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HWVoice hw;
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int64_t old_ticks;
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} NoVoice;
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#define dolog(...) AUD_log ("noaudio", __VA_ARGS__)
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#ifdef DEBUG
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#define ldebug(...) dolog (__VA_ARGS__)
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#else
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#define ldebug(...)
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#endif
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static void no_hw_run (HWVoice *hw)
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{
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NoVoice *no = (NoVoice *) hw;
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int rpos, live, decr, samples;
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st_sample_t *src;
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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->bytes_per_second) / ticks_per_sec;
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if (bytes > INT_MAX)
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samples = INT_MAX >> hw->shift;
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else
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samples = bytes >> hw->shift;
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live = pcm_hw_get_live (hw);
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if (live <= 0)
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return;
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no->old_ticks = now;
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decr = audio_MIN (live, samples);
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samples = decr;
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rpos = hw->rpos;
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while (samples) {
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int left_till_end_samples = hw->samples - rpos;
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int convert_samples = audio_MIN (samples, left_till_end_samples);
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src = advance (hw->mix_buf, rpos * sizeof (st_sample_t));
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memset (src, 0, convert_samples * sizeof (st_sample_t));
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rpos = (rpos + convert_samples) % hw->samples;
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samples -= convert_samples;
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}
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pcm_hw_dec_live (hw, decr);
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hw->rpos = rpos;
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}
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static int no_hw_write (SWVoice *sw, void *buf, int len)
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{
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return pcm_hw_write (sw, buf, len);
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}
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static int no_hw_init (HWVoice *hw, int freq, int nchannels, audfmt_e fmt)
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{
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hw->freq = freq;
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hw->nchannels = nchannels;
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hw->fmt = fmt;
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hw->bufsize = 4096;
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return 0;
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}
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static void no_hw_fini (HWVoice *hw)
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{
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(void) hw;
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}
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static int no_hw_ctl (HWVoice *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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}
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struct pcm_ops no_pcm_ops = {
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no_hw_init,
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no_hw_fini,
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no_hw_run,
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no_hw_write,
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no_hw_ctl
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};
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struct audio_output_driver no_output_driver = {
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"none",
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no_audio_init,
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no_audio_fini,
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&no_pcm_ops,
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1,
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1,
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sizeof (NoVoice)
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};
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