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qemu-e2k/audio/audio.c
bellard fe2cece60e audio fixes (malc) 
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1165 c046a42c-6fe2-441c-8c8c-71466251a162
2004-12-06 23:14:48 +00:00

912 lines
21 KiB
C
Raw Blame History

/*
* QEMU Audio subsystem
*
* Copyright (c) 2003-2004 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 <assert.h>
#include "vl.h"
#define USE_WAV_AUDIO
#include "audio/audio_int.h"
#define dolog(...) AUD_log ("audio", __VA_ARGS__)
#ifdef DEBUG
#define ldebug(...) dolog (__VA_ARGS__)
#else
#define ldebug(...)
#endif
#define QC_AUDIO_DRV "QEMU_AUDIO_DRV"
#define QC_VOICES "QEMU_VOICES"
#define QC_FIXED_FORMAT "QEMU_FIXED_FORMAT"
#define QC_FIXED_FREQ "QEMU_FIXED_FREQ"
static HWVoice *hw_voices;
AudioState audio_state = {
1, /* use fixed settings */
44100, /* fixed frequency */
2, /* fixed channels */
AUD_FMT_S16, /* fixed format */
1, /* number of hw voices */
-1 /* voice size */
};
/* http://www.df.lth.se/~john_e/gems/gem002d.html */
/* http://www.multi-platforms.com/Tips/PopCount.htm */
uint32_t popcount (uint32_t u)
{
u = ((u&0x55555555) + ((u>>1)&0x55555555));
u = ((u&0x33333333) + ((u>>2)&0x33333333));
u = ((u&0x0f0f0f0f) + ((u>>4)&0x0f0f0f0f));
u = ((u&0x00ff00ff) + ((u>>8)&0x00ff00ff));
u = ( u&0x0000ffff) + (u>>16);
return u;
}
inline uint32_t lsbindex (uint32_t u)
{
return popcount ((u&-u)-1);
}
int audio_get_conf_int (const char *key, int defval)
{
int val = defval;
char *strval;
strval = getenv (key);
if (strval) {
val = atoi (strval);
}
return val;
}
const char *audio_get_conf_str (const char *key, const char *defval)
{
const char *val = getenv (key);
if (!val)
return defval;
else
return val;
}
void AUD_log (const char *cap, const char *fmt, ...)
{
va_list ap;
fprintf (stderr, "%s: ", cap);
va_start (ap, fmt);
vfprintf (stderr, fmt, ap);
va_end (ap);
}
/*
* Soft Voice
*/
void pcm_sw_free_resources (SWVoice *sw)
{
if (sw->buf) qemu_free (sw->buf);
if (sw->rate) st_rate_stop (sw->rate);
sw->buf = NULL;
sw->rate = NULL;
}
int pcm_sw_alloc_resources (SWVoice *sw)
{
sw->buf = qemu_mallocz (sw->hw->samples * sizeof (st_sample_t));
if (!sw->buf)
return -1;
sw->rate = st_rate_start (sw->freq, sw->hw->freq);
if (!sw->rate) {
qemu_free (sw->buf);
sw->buf = NULL;
return -1;
}
return 0;
}
void pcm_sw_fini (SWVoice *sw)
{
pcm_sw_free_resources (sw);
}
int pcm_sw_init (SWVoice *sw, HWVoice *hw, int freq,
int nchannels, audfmt_e fmt)
{
int bits = 8, sign = 0;
switch (fmt) {
case AUD_FMT_S8:
sign = 1;
case AUD_FMT_U8:
break;
case AUD_FMT_S16:
sign = 1;
case AUD_FMT_U16:
bits = 16;
break;
}
sw->hw = hw;
sw->freq = freq;
sw->fmt = fmt;
sw->nchannels = nchannels;
sw->shift = (nchannels == 2) + (bits == 16);
sw->align = (1 << sw->shift) - 1;
sw->left = 0;
sw->pos = 0;
sw->wpos = 0;
sw->live = 0;
sw->ratio = (sw->hw->freq * ((int64_t) INT_MAX)) / sw->freq;
sw->bytes_per_second = sw->freq << sw->shift;
sw->conv = mixeng_conv[nchannels == 2][sign][bits == 16];
pcm_sw_free_resources (sw);
return pcm_sw_alloc_resources (sw);
}
/* Hard voice */
void pcm_hw_free_resources (HWVoice *hw)
{
if (hw->mix_buf)
qemu_free (hw->mix_buf);
hw->mix_buf = NULL;
}
int pcm_hw_alloc_resources (HWVoice *hw)
{
hw->mix_buf = qemu_mallocz (hw->samples * sizeof (st_sample_t));
if (!hw->mix_buf)
return -1;
return 0;
}
void pcm_hw_fini (HWVoice *hw)
{
if (hw->active) {
ldebug ("pcm_hw_fini: %d %d %d\n", hw->freq, hw->nchannels, hw->fmt);
pcm_hw_free_resources (hw);
hw->pcm_ops->fini (hw);
memset (hw, 0, audio_state.drv->voice_size);
}
}
void pcm_hw_gc (HWVoice *hw)
{
if (hw->nb_voices)
return;
pcm_hw_fini (hw);
}
int pcm_hw_get_live (HWVoice *hw)
{
int i, alive = 0, live = hw->samples;
for (i = 0; i < hw->nb_voices; i++) {
if (hw->pvoice[i]->live) {
live = audio_MIN (hw->pvoice[i]->live, live);
alive += 1;
}
}
if (alive)
return live;
else
return -1;
}
int pcm_hw_get_live2 (HWVoice *hw, int *nb_active)
{
int i, alive = 0, live = hw->samples;
*nb_active = 0;
for (i = 0; i < hw->nb_voices; i++) {
if (hw->pvoice[i]->live) {
if (hw->pvoice[i]->live < live) {
*nb_active = hw->pvoice[i]->active != 0;
live = hw->pvoice[i]->live;
}
alive += 1;
}
}
if (alive)
return live;
else
return -1;
}
void pcm_hw_dec_live (HWVoice *hw, int decr)
{
int i;
for (i = 0; i < hw->nb_voices; i++) {
if (hw->pvoice[i]->live) {
hw->pvoice[i]->live -= decr;
}
}
}
void pcm_hw_clear (HWVoice *hw, void *buf, int len)
{
if (!len)
return;
switch (hw->fmt) {
case AUD_FMT_S16:
case AUD_FMT_S8:
memset (buf, len << hw->shift, 0x00);
break;
case AUD_FMT_U8:
memset (buf, len << hw->shift, 0x80);
break;
case AUD_FMT_U16:
{
unsigned int i;
uint16_t *p = buf;
int shift = hw->nchannels - 1;
for (i = 0; i < len << shift; i++) {
p[i] = INT16_MAX;
}
}
break;
}
}
int pcm_hw_write (SWVoice *sw, void *buf, int size)
{
int hwsamples, samples, isamp, osamp, wpos, live, dead, left, swlim, blck;
int ret = 0, pos = 0;
if (!sw)
return size;
hwsamples = sw->hw->samples;
samples = size >> sw->shift;
if (!sw->live) {
sw->wpos = sw->hw->rpos;
}
wpos = sw->wpos;
live = sw->live;
dead = hwsamples - live;
swlim = (dead * ((int64_t) INT_MAX)) / sw->ratio;
swlim = audio_MIN (swlim, samples);
ldebug ("size=%d live=%d dead=%d swlim=%d wpos=%d\n",
size, live, dead, swlim, wpos);
if (swlim)
sw->conv (sw->buf, buf, swlim);
while (swlim) {
dead = hwsamples - live;
left = hwsamples - wpos;
blck = audio_MIN (dead, left);
if (!blck) {
/* dolog ("swlim=%d\n", swlim); */
break;
}
isamp = swlim;
osamp = blck;
st_rate_flow (sw->rate, sw->buf + pos, sw->hw->mix_buf + wpos, &isamp, &osamp);
ret += isamp;
swlim -= isamp;
pos += isamp;
live += osamp;
wpos = (wpos + osamp) % hwsamples;
}
sw->wpos = wpos;
sw->live = live;
return ret << sw->shift;
}
int pcm_hw_init (HWVoice *hw, int freq, int nchannels, audfmt_e fmt)
{
int sign = 0, bits = 8;
pcm_hw_fini (hw);
ldebug ("pcm_hw_init: %d %d %d\n", freq, nchannels, fmt);
if (hw->pcm_ops->init (hw, freq, nchannels, fmt)) {
memset (hw, 0, audio_state.drv->voice_size);
return -1;
}
switch (hw->fmt) {
case AUD_FMT_S8:
sign = 1;
case AUD_FMT_U8:
break;
case AUD_FMT_S16:
sign = 1;
case AUD_FMT_U16:
bits = 16;
break;
}
hw->nb_voices = 0;
hw->active = 1;
hw->shift = (hw->nchannels == 2) + (bits == 16);
hw->bytes_per_second = hw->freq << hw->shift;
hw->align = (1 << hw->shift) - 1;
hw->samples = hw->bufsize >> hw->shift;
hw->clip = mixeng_clip[hw->nchannels == 2][sign][bits == 16];
if (pcm_hw_alloc_resources (hw)) {
pcm_hw_fini (hw);
return -1;
}
return 0;
}
static int dist (void *hw)
{
if (hw) {
return (((uint8_t *) hw - (uint8_t *) hw_voices)
/ audio_state.drv->voice_size) + 1;
}
else {
return 0;
}
}
#define ADVANCE(hw) \
((hw) ? advance (hw, audio_state.drv->voice_size) : hw_voices)
HWVoice *pcm_hw_find_any (HWVoice *hw)
{
int i = dist (hw);
for (; i < audio_state.nb_hw_voices; i++) {
hw = ADVANCE (hw);
return hw;
}
return NULL;
}
HWVoice *pcm_hw_find_any_active (HWVoice *hw)
{
int i = dist (hw);
for (; i < audio_state.nb_hw_voices; i++) {
hw = ADVANCE (hw);
if (hw->active)
return hw;
}
return NULL;
}
HWVoice *pcm_hw_find_any_active_enabled (HWVoice *hw)
{
int i = dist (hw);
for (; i < audio_state.nb_hw_voices; i++) {
hw = ADVANCE (hw);
if (hw->active && hw->enabled)
return hw;
}
return NULL;
}
HWVoice *pcm_hw_find_any_passive (HWVoice *hw)
{
int i = dist (hw);
for (; i < audio_state.nb_hw_voices; i++) {
hw = ADVANCE (hw);
if (!hw->active)
return hw;
}
return NULL;
}
HWVoice *pcm_hw_find_specific (HWVoice *hw, int freq,
int nchannels, audfmt_e fmt)
{
while ((hw = pcm_hw_find_any_active (hw))) {
if (hw->freq == freq &&
hw->nchannels == nchannels &&
hw->fmt == fmt)
return hw;
}
return NULL;
}
HWVoice *pcm_hw_add (int freq, int nchannels, audfmt_e fmt)
{
HWVoice *hw;
if (audio_state.fixed_format) {
freq = audio_state.fixed_freq;
nchannels = audio_state.fixed_channels;
fmt = audio_state.fixed_fmt;
}
hw = pcm_hw_find_specific (NULL, freq, nchannels, fmt);
if (hw)
return hw;
hw = pcm_hw_find_any_passive (NULL);
if (hw) {
hw->pcm_ops = audio_state.drv->pcm_ops;
if (!hw->pcm_ops)
return NULL;
if (pcm_hw_init (hw, freq, nchannels, fmt)) {
pcm_hw_gc (hw);
return NULL;
}
else
return hw;
}
return pcm_hw_find_any (NULL);
}
int pcm_hw_add_sw (HWVoice *hw, SWVoice *sw)
{
SWVoice **pvoice = qemu_mallocz ((hw->nb_voices + 1) * sizeof (sw));
if (!pvoice)
return -1;
memcpy (pvoice, hw->pvoice, hw->nb_voices * sizeof (sw));
qemu_free (hw->pvoice);
hw->pvoice = pvoice;
hw->pvoice[hw->nb_voices++] = sw;
return 0;
}
int pcm_hw_del_sw (HWVoice *hw, SWVoice *sw)
{
int i, j;
if (hw->nb_voices > 1) {
SWVoice **pvoice = qemu_mallocz ((hw->nb_voices - 1) * sizeof (sw));
if (!pvoice) {
dolog ("Can not maintain consistent state (not enough memory)\n");
return -1;
}
for (i = 0, j = 0; i < hw->nb_voices; i++) {
if (j >= hw->nb_voices - 1) {
dolog ("Can not maintain consistent state "
"(invariant violated)\n");
return -1;
}
if (hw->pvoice[i] != sw)
pvoice[j++] = hw->pvoice[i];
}
qemu_free (hw->pvoice);
hw->pvoice = pvoice;
hw->nb_voices -= 1;
}
else {
qemu_free (hw->pvoice);
hw->pvoice = NULL;
hw->nb_voices = 0;
}
return 0;
}
SWVoice *pcm_create_voice_pair (int freq, int nchannels, audfmt_e fmt)
{
SWVoice *sw;
HWVoice *hw;
sw = qemu_mallocz (sizeof (*sw));
if (!sw)
goto err1;
hw = pcm_hw_add (freq, nchannels, fmt);
if (!hw)
goto err2;
if (pcm_hw_add_sw (hw, sw))
goto err3;
if (pcm_sw_init (sw, hw, freq, nchannels, fmt))
goto err4;
return sw;
err4:
pcm_hw_del_sw (hw, sw);
err3:
pcm_hw_gc (hw);
err2:
qemu_free (sw);
err1:
return NULL;
}
SWVoice *AUD_open (SWVoice *sw, const char *name,
int freq, int nchannels, audfmt_e fmt)
{
if (!audio_state.drv) {
return NULL;
}
if (sw && freq == sw->freq && sw->nchannels == nchannels && sw->fmt == fmt) {
return sw;
}
if (sw) {
ldebug ("Different format %s %d %d %d\n",
name,
sw->freq == freq,
sw->nchannels == nchannels,
sw->fmt == fmt);
}
if (nchannels != 1 && nchannels != 2) {
dolog ("Bogus channel count %d for voice %s\n", nchannels, name);
return NULL;
}
if (!audio_state.fixed_format && sw) {
pcm_sw_fini (sw);
pcm_hw_del_sw (sw->hw, sw);
pcm_hw_gc (sw->hw);
if (sw->name) {
qemu_free (sw->name);
sw->name = NULL;
}
qemu_free (sw);
sw = NULL;
}
if (sw) {
HWVoice *hw = sw->hw;
if (!hw) {
dolog ("Internal logic error voice %s has no hardware store\n",
name);
return sw;
}
if (pcm_sw_init (sw, hw, freq, nchannels, fmt)) {
pcm_sw_fini (sw);
pcm_hw_del_sw (hw, sw);
pcm_hw_gc (hw);
if (sw->name) {
qemu_free (sw->name);
sw->name = NULL;
}
qemu_free (sw);
return NULL;
}
}
else {
sw = pcm_create_voice_pair (freq, nchannels, fmt);
if (!sw) {
dolog ("Failed to create voice %s\n", name);
return NULL;
}
}
if (sw->name) {
qemu_free (sw->name);
sw->name = NULL;
}
sw->name = qemu_strdup (name);
return sw;
}
void AUD_close (SWVoice *sw)
{
if (!sw)
return;
pcm_sw_fini (sw);
pcm_hw_del_sw (sw->hw, sw);
pcm_hw_gc (sw->hw);
if (sw->name) {
qemu_free (sw->name);
sw->name = NULL;
}
qemu_free (sw);
}
int AUD_write (SWVoice *sw, void *buf, int size)
{
int bytes;
if (!sw->hw->enabled)
dolog ("Writing to disabled voice %s\n", sw->name);
bytes = sw->hw->pcm_ops->write (sw, buf, size);
return bytes;
}
void AUD_run (void)
{
HWVoice *hw = NULL;
while ((hw = pcm_hw_find_any_active_enabled (hw))) {
int i;
if (hw->pending_disable && pcm_hw_get_live (hw) <= 0) {
hw->enabled = 0;
hw->pcm_ops->ctl (hw, VOICE_DISABLE);
for (i = 0; i < hw->nb_voices; i++) {
hw->pvoice[i]->live = 0;
/* hw->pvoice[i]->old_ticks = 0; */
}
continue;
}
hw->pcm_ops->run (hw);
assert (hw->rpos < hw->samples);
for (i = 0; i < hw->nb_voices; i++) {
SWVoice *sw = hw->pvoice[i];
if (!sw->active && !sw->live && sw->old_ticks) {
int64_t delta = qemu_get_clock (vm_clock) - sw->old_ticks;
if (delta > audio_state.ticks_threshold) {
ldebug ("resetting old_ticks for %s\n", sw->name);
sw->old_ticks = 0;
}
}
}
}
}
int AUD_get_free (SWVoice *sw)
{
int free;
if (!sw)
return 4096;
free = ((sw->hw->samples - sw->live) << sw->hw->shift) * sw->ratio
/ INT_MAX;
free &= ~sw->hw->align;
if (!free) return 0;
return free;
}
int AUD_get_buffer_size (SWVoice *sw)
{
return sw->hw->bufsize;
}
void AUD_adjust (SWVoice *sw, int bytes)
{
if (!sw)
return;
sw->old_ticks += (ticks_per_sec * (int64_t) bytes) / sw->bytes_per_second;
}
void AUD_reset (SWVoice *sw)
{
sw->active = 0;
sw->old_ticks = 0;
}
int AUD_calc_elapsed (SWVoice *sw)
{
int64_t now, delta, bytes;
int dead, swlim;
if (!sw)
return 0;
now = qemu_get_clock (vm_clock);
delta = now - sw->old_ticks;
bytes = (delta * sw->bytes_per_second) / ticks_per_sec;
if (delta < 0) {
dolog ("whoops delta(<0)=%lld\n", delta);
return 0;
}
dead = sw->hw->samples - sw->live;
swlim = ((dead * (int64_t) INT_MAX) / sw->ratio);
if (bytes > swlim) {
return swlim;
}
else {
return bytes;
}
}
void AUD_enable (SWVoice *sw, int on)
{
int i;
HWVoice *hw;
if (!sw)
return;
hw = sw->hw;
if (on) {
if (!sw->live)
sw->wpos = sw->hw->rpos;
if (!sw->old_ticks) {
sw->old_ticks = qemu_get_clock (vm_clock);
}
}
if (sw->active != on) {
if (on) {
hw->pending_disable = 0;
if (!hw->enabled) {
hw->enabled = 1;
for (i = 0; i < hw->nb_voices; i++) {
ldebug ("resetting voice\n");
sw = hw->pvoice[i];
sw->old_ticks = qemu_get_clock (vm_clock);
}
hw->pcm_ops->ctl (hw, VOICE_ENABLE);
}
}
else {
if (hw->enabled && !hw->pending_disable) {
int nb_active = 0;
for (i = 0; i < hw->nb_voices; i++) {
nb_active += hw->pvoice[i]->active != 0;
}
if (nb_active == 1) {
hw->pending_disable = 1;
}
}
}
sw->active = on;
}
}
static struct audio_output_driver *drvtab[] = {
#ifdef CONFIG_OSS
&oss_output_driver,
#endif
#ifdef CONFIG_FMOD
&fmod_output_driver,
#endif
#ifdef CONFIG_SDL
&sdl_output_driver,
#endif
&no_output_driver,
#ifdef USE_WAV_AUDIO
&wav_output_driver,
#endif
};
static int voice_init (struct audio_output_driver *drv)
{
audio_state.opaque = drv->init ();
if (audio_state.opaque) {
if (audio_state.nb_hw_voices > drv->max_voices) {
dolog ("`%s' does not support %d multiple hardware channels\n"
"Resetting to %d\n",
drv->name, audio_state.nb_hw_voices, drv->max_voices);
audio_state.nb_hw_voices = drv->max_voices;
}
hw_voices = qemu_mallocz (audio_state.nb_hw_voices * drv->voice_size);
if (hw_voices) {
audio_state.drv = drv;
return 1;
}
else {
dolog ("Not enough memory for %d `%s' voices (each %d bytes)\n",
audio_state.nb_hw_voices, drv->name, drv->voice_size);
drv->fini (audio_state.opaque);
return 0;
}
}
else {
dolog ("Could not init `%s' audio\n", drv->name);
return 0;
}
}
static void audio_vm_stop_handler (void *opaque, int reason)
{
HWVoice *hw = NULL;
while ((hw = pcm_hw_find_any (hw))) {
if (!hw->pcm_ops)
continue;
hw->pcm_ops->ctl (hw, reason ? VOICE_ENABLE : VOICE_DISABLE);
}
}
static void audio_atexit (void)
{
HWVoice *hw = NULL;
while ((hw = pcm_hw_find_any (hw))) {
if (!hw->pcm_ops)
continue;
hw->pcm_ops->ctl (hw, VOICE_DISABLE);
hw->pcm_ops->fini (hw);
}
audio_state.drv->fini (audio_state.opaque);
}
static void audio_save (QEMUFile *f, void *opaque)
{
}
static int audio_load (QEMUFile *f, void *opaque, int version_id)
{
if (version_id != 1)
return -EINVAL;
return 0;
}
void AUD_init (void)
{
int i;
int done = 0;
const char *drvname;
audio_state.fixed_format =
!!audio_get_conf_int (QC_FIXED_FORMAT, audio_state.fixed_format);
audio_state.fixed_freq =
audio_get_conf_int (QC_FIXED_FREQ, audio_state.fixed_freq);
audio_state.nb_hw_voices =
audio_get_conf_int (QC_VOICES, audio_state.nb_hw_voices);
if (audio_state.nb_hw_voices <= 0) {
dolog ("Bogus number of voices %d, resetting to 1\n",
audio_state.nb_hw_voices);
}
drvname = audio_get_conf_str (QC_AUDIO_DRV, NULL);
if (drvname) {
int found = 0;
for (i = 0; i < sizeof (drvtab) / sizeof (drvtab[0]); i++) {
if (!strcmp (drvname, drvtab[i]->name)) {
done = voice_init (drvtab[i]);
found = 1;
break;
}
}
if (!found) {
dolog ("Unknown audio driver `%s'\n", drvname);
}
}
qemu_add_vm_stop_handler (audio_vm_stop_handler, NULL);
atexit (audio_atexit);
if (!done) {
for (i = 0; !done && i < sizeof (drvtab) / sizeof (drvtab[0]); i++) {
if (drvtab[i]->can_be_default)
done = voice_init (drvtab[i]);
}
}
audio_state.ticks_threshold = ticks_per_sec / 50;
audio_state.freq_threshold = 100;
register_savevm ("audio", 0, 1, audio_save, audio_load, NULL);
if (!done) {
dolog ("Can not initialize audio subsystem\n");
voice_init (&no_output_driver);
}
}
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