[MPlayer-dev-eng] alsa9-driver
joy_ping
joy at pingfm.org
Mon Oct 15 04:06:23 CEST 2001
hi,
i attached a patch to current audio-driver for alsa9-beta-support.
a few weeks-ago i posted some kind of dirty one-night-hack to the
users-list. as i saw its aplied to the latest cvs. i cleaned up
ao_alsa9.c, ENGLISH-comments, different startup message: no more dont use
it, use the oss-emu instead, cause when nobody use it, i dont know whats
wrong. only bugs that remain, as i can see, is some furios av-sync proplem
under heavy cpu-load, but this disapears with the -framdrop option, also
sound simply disepears without message after heavily moving the vid-window
or doing many tasks at the same time, i think its a buffer underrun
problem, but dont know exactly. i switched off the routine wich
handles the buffer-underrun thing for now, cause i think its wrong, i will
take a look at it the next days.
patch against current cvs ao_alsa9.c, i also attached a clean ao_alsa9.c
cause its not such a large file.
regards
joy
-------------- next part --------------
--- ao_alsa9.c Sun Oct 14 04:17:54 2001
+++ ao_alsa9_clean.c Sun Oct 14 04:17:35 2001
@@ -3,7 +3,12 @@
(C) Alex Beregszaszi <alex at naxine.org>
- Don't use this buggy driver, ALSA-0.9.x emulates OSS very well...
+ modified for better alsa-0.9.0beta8a-support by Joy Winter <joy at pingfm.org>
+
+ This driver is still at alpha stage.
+ If you want stable sound-support use the OSS emulation instead.
+
+ Any bugreports regarding to this driver are welcome either to the mplayer-user-mailinglist or directly to the authors.
*/
#include <errno.h>
@@ -21,7 +26,7 @@
{
"ALSA-0.9.x audio output",
"alsa9",
- "Alex Beregszaszi <alex at naxine.org>",
+ "Alex Beregszaszi <alex at naxine.org>, Joy Winter <joy at pingfm.org>",
"under developement"
};
@@ -41,10 +46,13 @@
static snd_pcm_hw_params_t *alsa_hwparams;
static snd_pcm_sw_params_t *alsa_swparams;
static char *alsa_device;
-#define ALSA_DEVICE_SIZE 48 /* war 48 */
+#define ALSA_DEVICE_SIZE 48
+
+static int alsa_fragsize = 8192; /* possible 4096, original 8192 */
+static int alsa_fragcount = 8;
-static int alsa_fragsize = 8192; /* 4096 war 8192*/
-static int alsa_fragcount = 8; /* war 8 */
+static int chunk_size = -1;
+static int start_delay = 1;
/* to set/get/query special features/parameters */
static int control(int cmd, int arg)
@@ -69,12 +77,12 @@
return(CONTROL_UNKNOWN);
}
-#undef start /* war undef */
+#undef start /* orig. undef */
#define buffersize
-#undef buffertime /* war undef? */
+#define buffertime /* orig. undef? */
#define set_period
-#define sw_params /* war undef */
-#undef set_start_mode /* war undef */
+#define sw_params /* orig. undef */
+#undef set_start_mode /* orig. undef */
/*
open & setup audio device
@@ -86,8 +94,10 @@
int cards = -1;
snd_pcm_info_t *alsa_info;
- printf("alsa-init: Don't use this buggy driver, ALSA-0.9.x emulates OSS very well... modified by me\n");
+ size_t xfer_align; //new
+ snd_pcm_uframes_t start_threshold, stop_threshold; //new
+ printf("alsa-init: this driver is still at alpha-stage. if you want stable sound support use the OSS emulation instead.\n");
printf("alsa-init: requested format: %d Hz, %d channels, %s\n", rate_hz,
channels, audio_out_format_name(format));
@@ -102,9 +112,8 @@
return(0);
}
- ao_samplerate = rate_hz; /*war rate_hz */
+ ao_samplerate = rate_hz;
ao_bps = channels; /* really this is bytes per frame so bad varname */
- /* ao_bps = channels */
ao_format = format;
ao_channels = channels;
ao_outburst = OUTBURST;
@@ -184,8 +193,8 @@
}
snd_pcm_hw_params_malloc(&alsa_hwparams);
- snd_pcm_sw_params_malloc(&alsa_swparams);
-
+ //snd_pcm_sw_params_malloc(&alsa_swparams);
+ snd_pcm_sw_params_alloca(&alsa_swparams);
if ((err = snd_pcm_hw_params_any(alsa_handler, alsa_hwparams)) < 0)
{
printf("alsa-init: unable to get initial parameters: %s\n",
@@ -218,11 +227,11 @@
}
if ((err = snd_pcm_hw_params_set_rate_near(alsa_handler, alsa_hwparams, ao_samplerate, 0)) < 0)
-/* war nur snd_pcm_hw_params_set_rate */
+/* was originally only snd_pcm_hw_params_set_rate jp*/
{
printf("alsa-init: unable to set samplerate-2: %s\n",
snd_strerror(err));
- //snd_pcm_hw_params_dump(alsa_hwparams, errlog);
+ //snd_pcm_hw_params_dump(alsa_hwparams, errlog); jp
return(0);
}
@@ -234,12 +243,12 @@
snd_strerror(err));
return(0);
}
- if ((err = snd_pcm_hw_params_set_periods(alsa_handler, alsa_hwparams, alsa_fragcount, 0)) < 0)
- {
- printf("alsa-init: unable to set periods: %s\n",
- snd_strerror(err));
- return(0);
- }
+ if ((err = snd_pcm_hw_params_set_periods(alsa_handler, alsa_hwparams, alsa_fragcount, 0)) < 0)
+ {
+ printf("alsa-init: unable to set periods: %s\n",
+ snd_strerror(err));
+ return(0);
+ }
}
#endif
#ifdef buffersize
@@ -258,7 +267,7 @@
#ifdef buffertime
{
- int alsa_buffer_time = 60; /* war 60 */
+ int alsa_buffer_time = 500000; /* original 60 */
if ((err = snd_pcm_hw_params_set_buffer_time_near(alsa_handler, alsa_hwparams, alsa_buffer_time, 0)) < 0)
{
@@ -268,8 +277,8 @@
} else
alsa_buffer_time = err;
- if ((err = snd_pcm_hw_params_set_period_time_near(alsa_handler, alsa_hwparams, alsa_buffer_time/ao_bps, 0)) < 0)
- /* war alsa_buffer_time/ao_bps */
+ if ((err = snd_pcm_hw_params_set_period_time_near(alsa_handler, alsa_hwparams, alsa_buffer_time/4, 0)) < 0)
+ /* original: alsa_buffer_time/ao_bps */
{
printf("alsa-init: unable to set period time: %s\n",
snd_strerror(err));
@@ -288,12 +297,38 @@
}
#ifdef sw_params
+ {
+ chunk_size = snd_pcm_hw_params_get_period_size(alsa_hwparams, 0);
+ start_threshold = (double) ao_samplerate * start_delay / 1000000;
+ xfer_align = snd_pcm_sw_params_get_xfer_align(alsa_swparams);
+
if ((err = snd_pcm_sw_params_current(alsa_handler, alsa_swparams)) < 0)
{
printf("alsa-init: unable to get parameters: %s\n",
snd_strerror(err));
return(0);
- }
+ }
+
+ if ((err = snd_pcm_sw_params_set_avail_min(alsa_handler, alsa_swparams, chunk_size)) < 0)
+ {
+ printf("alsa-init: unable to set avail_min %s\n",snd_strerror(err));
+ return(0);
+ }
+
+
+
+ if ((err = snd_pcm_sw_params_set_start_threshold(alsa_handler, alsa_swparams, start_threshold)) < 0)
+ {
+ printf("alsa-init: unable to set start_threshold %s\n",snd_strerror(err));
+ return(0);
+ }
+ }
+ // if ((err = snd_pcm_sw_params_set_xfer_align(alsa_handler, alsa_swparams, xfer_align)) < 0)
+ //{
+ // printf("alsa-init: unable to set xfer_align: %s\n",
+ // snd_strerror(err));
+ // return(0);
+ //}
#ifdef set_start_mode
if ((err = snd_pcm_sw_params_set_start_mode(alsa_handler, alsa_swparams,
@@ -453,8 +488,8 @@
got_len = snd_pcm_writei(alsa_handler, data, len / 4);
- // war: if ((got_len = snd_pcm_writei(alsa_handler, data, (len/ao_bps))) != (len/ao_bps)) {
-
+ //if ((got_len = snd_pcm_writei(alsa_handler, data, (len/ao_bps))) != (len/ao_bps)) {
+ //SHOULD BE FIXED
if (got_len == -EPIPE) /* underrun? */
{
printf("alsa-play: alsa underrun, resetting stream\n");
@@ -472,6 +507,7 @@
return(len); /* 2nd write was ok */
}
return(len);
+ //}
}
/* how many byes are free in the buffer */
-------------- next part --------------
/*
ao_alsa9 - ALSA-0.9.x output plugin for MPlayer
(C) Alex Beregszaszi <alex at naxine.org>
modified for better alsa-0.9.0beta8a-support by Joy Winter <joy at pingfm.org>
This driver is still at alpha stage.
If you want stable sound-support use the OSS emulation instead.
Any bugreports regarding to this driver are welcome either to the mplayer-user-mailinglist or directly to the authors.
*/
#include <errno.h>
#include <sys/asoundlib.h>
#include "../config.h"
#include "audio_out.h"
#include "audio_out_internal.h"
#include "afmt.h"
extern int verbose;
static ao_info_t info =
{
"ALSA-0.9.x audio output",
"alsa9",
"Alex Beregszaszi <alex at naxine.org>, Joy Winter <joy at pingfm.org>",
"under developement"
};
LIBAO_EXTERN(alsa9)
/* global variables:
ao_samplerate
ao_channels
ao_format
ao_bps
ao_outburst
ao_buffersize
*/
static snd_pcm_t *alsa_handler;
static snd_pcm_format_t alsa_format;
static snd_pcm_hw_params_t *alsa_hwparams;
static snd_pcm_sw_params_t *alsa_swparams;
static char *alsa_device;
#define ALSA_DEVICE_SIZE 48
static int alsa_fragsize = 8192; /* possible 4096, original 8192 */
static int alsa_fragcount = 8;
static int chunk_size = -1;
static int start_delay = 1;
/* to set/get/query special features/parameters */
static int control(int cmd, int arg)
{
switch(cmd)
{
case AOCONTROL_GET_DEVICE:
return((char *)alsa_device); /* egy kicsit brutalis, dehat :) */
case AOCONTROL_SET_DEVICE:
{
int ret;
strncpy(alsa_device, (char *)arg, ALSA_DEVICE_SIZE);
uninit();
ret = init(ao_samplerate, ao_channels, ao_format, 0);
if (ret == 0)
return(CONTROL_ERROR);
else
return(CONTROL_OK);
}
}
return(CONTROL_UNKNOWN);
}
#undef start /* orig. undef */
#define buffersize
#define buffertime /* orig. undef? */
#define set_period
#define sw_params /* orig. undef */
#undef set_start_mode /* orig. undef */
/*
open & setup audio device
return: 1=success 0=fail
*/
static int init(int rate_hz, int channels, int format, int flags)
{
int err;
int cards = -1;
snd_pcm_info_t *alsa_info;
size_t xfer_align; //new
snd_pcm_uframes_t start_threshold, stop_threshold; //new
printf("alsa-init: this driver is still at alpha-stage. if you want stable sound support use the OSS emulation instead.\n");
printf("alsa-init: requested format: %d Hz, %d channels, %s\n", rate_hz,
channels, audio_out_format_name(format));
alsa_handler = NULL;
if (verbose)
printf("alsa-init: compiled for ALSA-%s\n", SND_LIB_VERSION_STR);
if ((err = snd_card_next(&cards)) < 0 || cards < 0)
{
printf("alsa-init: no soundcards found: %s\n", snd_strerror(err));
return(0);
}
ao_samplerate = rate_hz;
ao_bps = channels; /* really this is bytes per frame so bad varname */
ao_format = format;
ao_channels = channels;
ao_outburst = OUTBURST;
ao_buffersize = 16384;
switch (format)
{
case AFMT_S8:
alsa_format = SND_PCM_FORMAT_S8;
break;
case AFMT_U8:
alsa_format = SND_PCM_FORMAT_U8;
break;
case AFMT_U16_LE:
alsa_format = SND_PCM_FORMAT_U16_LE;
break;
case AFMT_U16_BE:
alsa_format = SND_PCM_FORMAT_U16_BE;
break;
case AFMT_S16_LE:
alsa_format = SND_PCM_FORMAT_S16_LE;
break;
case AFMT_S16_BE:
alsa_format = SND_PCM_FORMAT_S16_BE;
break;
default:
alsa_format = SND_PCM_FORMAT_MPEG;
break;
}
switch(alsa_format)
{
case SND_PCM_FORMAT_S16_LE:
case SND_PCM_FORMAT_U16_LE:
ao_bps *= 2;
break;
case -1:
printf("alsa-init: invalid format (%s) requested - output disabled\n",
audio_out_format_name(format));
return(0);
default:
break;
}
if ((err = snd_pcm_info_malloc(&alsa_info)) < 0)
{
printf("alsa-init: memory allocation error: %s\n", snd_strerror(err));
return(0);
}
if (ao_subdevice != NULL)
alsa_device = ao_subdevice;
if (alsa_device == NULL)
{
if ((alsa_device = malloc(ALSA_DEVICE_SIZE)) == NULL)
{
printf("alsa-init: memory allocation error: %s\n", strerror(errno));
return(0);
}
snprintf(alsa_device, ALSA_DEVICE_SIZE, "hw:%d,%d",
snd_pcm_info_get_device(alsa_info),
snd_pcm_info_get_subdevice(alsa_info));
snd_pcm_info_free(alsa_info);
}
printf("alsa-init: %d soundcard%s found, using: %s\n", cards+1,
(cards >= 0) ? "" : "s", alsa_device);
if ((err = snd_pcm_open(&alsa_handler, alsa_device, SND_PCM_STREAM_PLAYBACK,
0)) < 0)
{
printf("alsa-init: playback open error: %s\n", snd_strerror(err));
return(0);
}
snd_pcm_hw_params_malloc(&alsa_hwparams);
//snd_pcm_sw_params_malloc(&alsa_swparams);
snd_pcm_sw_params_alloca(&alsa_swparams);
if ((err = snd_pcm_hw_params_any(alsa_handler, alsa_hwparams)) < 0)
{
printf("alsa-init: unable to get initial parameters: %s\n",
snd_strerror(err));
return(0);
}
if ((err = snd_pcm_hw_params_set_access(alsa_handler, alsa_hwparams,
SND_PCM_ACCESS_RW_INTERLEAVED)) < 0)
{
printf("alsa-init: unable to set access type: %s\n",
snd_strerror(err));
return(0);
}
if ((err = snd_pcm_hw_params_set_format(alsa_handler, alsa_hwparams,
alsa_format)) < 0)
{
printf("alsa-init: unable to set format: %s\n",
snd_strerror(err));
return(0);
}
if ((err = snd_pcm_hw_params_set_channels(alsa_handler, alsa_hwparams,
ao_channels)) < 0)
{
printf("alsa-init: unable to set channels: %s\n",
snd_strerror(err));
return(0);
}
if ((err = snd_pcm_hw_params_set_rate_near(alsa_handler, alsa_hwparams, ao_samplerate, 0)) < 0)
/* was originally only snd_pcm_hw_params_set_rate jp*/
{
printf("alsa-init: unable to set samplerate-2: %s\n",
snd_strerror(err));
//snd_pcm_hw_params_dump(alsa_hwparams, errlog); jp
return(0);
}
#ifdef set_period
{
if ((err = snd_pcm_hw_params_set_period_size(alsa_handler, alsa_hwparams, alsa_fragsize / 4, 0)) < 0)
{
printf("alsa-init: unable to set periodsize: %s\n",
snd_strerror(err));
return(0);
}
if ((err = snd_pcm_hw_params_set_periods(alsa_handler, alsa_hwparams, alsa_fragcount, 0)) < 0)
{
printf("alsa-init: unable to set periods: %s\n",
snd_strerror(err));
return(0);
}
}
#endif
#ifdef buffersize
if ((err = snd_pcm_hw_params_get_buffer_size(alsa_hwparams)) < 0)
{
printf("alsa-init: unable to get buffer size: %s\n",
snd_strerror(err));
return(0);
} else
{
ao_buffersize = err;
if (verbose)
printf("alsa-init: got buffersize %i\n", ao_buffersize);
}
#endif
#ifdef buffertime
{
int alsa_buffer_time = 500000; /* original 60 */
if ((err = snd_pcm_hw_params_set_buffer_time_near(alsa_handler, alsa_hwparams, alsa_buffer_time, 0)) < 0)
{
printf("alsa-init: unable to set buffer time near: %s\n",
snd_strerror(err));
return(0);
} else
alsa_buffer_time = err;
if ((err = snd_pcm_hw_params_set_period_time_near(alsa_handler, alsa_hwparams, alsa_buffer_time/4, 0)) < 0)
/* original: alsa_buffer_time/ao_bps */
{
printf("alsa-init: unable to set period time: %s\n",
snd_strerror(err));
return(0);
}
printf("alsa-init: buffer_time: %d, period_time :%d\n",
alsa_buffer_time, err);
}
#endif
if ((err = snd_pcm_hw_params(alsa_handler, alsa_hwparams)) < 0)
{
printf("alsa-init: unable to set parameters: %s\n",
snd_strerror(err));
return(0);
}
#ifdef sw_params
{
chunk_size = snd_pcm_hw_params_get_period_size(alsa_hwparams, 0);
start_threshold = (double) ao_samplerate * start_delay / 1000000;
xfer_align = snd_pcm_sw_params_get_xfer_align(alsa_swparams);
if ((err = snd_pcm_sw_params_current(alsa_handler, alsa_swparams)) < 0)
{
printf("alsa-init: unable to get parameters: %s\n",
snd_strerror(err));
return(0);
}
if ((err = snd_pcm_sw_params_set_avail_min(alsa_handler, alsa_swparams, chunk_size)) < 0)
{
printf("alsa-init: unable to set avail_min %s\n",snd_strerror(err));
return(0);
}
if ((err = snd_pcm_sw_params_set_start_threshold(alsa_handler, alsa_swparams, start_threshold)) < 0)
{
printf("alsa-init: unable to set start_threshold %s\n",snd_strerror(err));
return(0);
}
}
// if ((err = snd_pcm_sw_params_set_xfer_align(alsa_handler, alsa_swparams, xfer_align)) < 0)
//{
// printf("alsa-init: unable to set xfer_align: %s\n",
// snd_strerror(err));
// return(0);
//}
#ifdef set_start_mode
if ((err = snd_pcm_sw_params_set_start_mode(alsa_handler, alsa_swparams,
SND_PCM_START_DATA)) < 0)
{
printf("alsa-init: unable to set start mode: %s\n",
snd_strerror(err));
return(0);
}
#endif
if ((err = snd_pcm_sw_params(alsa_handler, alsa_swparams)) < 0)
{
printf("alsa-init: unable to set parameters: %s\n",
snd_strerror(err));
return(0);
}
// snd_pcm_sw_params_default(alsa_handler, alsa_swparams);
#endif
if ((err = snd_pcm_prepare(alsa_handler)) < 0)
{
printf("alsa-init: pcm prepare error: %s\n", snd_strerror(err));
return(0);
}
#ifdef start
if ((err = snd_pcm_start(alsa_handler)) < 0)
{
printf("alsa-init: pcm start error: %s\n", snd_strerror(err));
if (err != -EPIPE)
return(0);
if ((err = snd_pcm_start(alsa_handler)) < 0)
{
printf("alsa-init: pcm start error: %s\n", snd_strerror(err));
return(0);
}
}
#endif
printf("AUDIO: %d Hz/%d channels/%d bpf/%d bytes buffer/%s\n",
ao_samplerate, ao_channels, ao_bps, ao_buffersize,
snd_pcm_format_description(alsa_format));
return(1);
}
/* close audio device */
static void uninit()
{
int err;
if (alsa_device != NULL)
free(alsa_device);
snd_pcm_hw_params_free(alsa_hwparams);
snd_pcm_sw_params_free(alsa_swparams);
if ((err = snd_pcm_drain(alsa_handler)) < 0)
{
printf("alsa-uninit: pcm drain error: %s\n", snd_strerror(err));
return;
}
#ifdef start
if ((err = snd_pcm_reset(alsa_handler)) < 0)
{
printf("alsa-uninit: pcm reset error: %s\n", snd_strerror(err));
return;
}
#endif
if ((err = snd_pcm_close(alsa_handler)) < 0)
{
printf("alsa-uninit: pcm close error: %s\n", snd_strerror(err));
return;
}
}
static void audio_pause()
{
int err;
if ((err = snd_pcm_drain(alsa_handler)) < 0)
{
printf("alsa-pause: pcm drain error: %s\n", snd_strerror(err));
return;
}
#ifdef reset
if ((err = snd_pcm_reset(alsa_handler)) < 0)
{
printf("alsa-pause: pcm reset error: %s\n", snd_strerror(err));
return;
}
#endif
}
static void audio_resume()
{
int err;
if ((err = snd_pcm_prepare(alsa_handler)) < 0)
{
printf("alsa-resume: pcm prepare error: %s\n", snd_strerror(err));
return;
}
#ifdef start
if ((err = snd_pcm_start(alsa_handler)) < 0)
{
printf("alsa-resume: pcm start error: %s\n", snd_strerror(err));
return;
}
#endif
}
/* stop playing and empty buffers (for seeking/pause) */
static void reset()
{
int err;
if ((err = snd_pcm_drain(alsa_handler)) < 0)
{
printf("alsa-reset: pcm drain error: %s\n", snd_strerror(err));
return;
}
#ifdef start
if ((err = snd_pcm_reset(alsa_handler)) < 0)
{
printf("alsa-reset: pcm reset error: %s\n", snd_strerror(err));
return;
}
#endif
if ((err = snd_pcm_prepare(alsa_handler)) < 0)
{
printf("alsa-reset: pcm prepare error: %s\n", snd_strerror(err));
return;
}
#ifdef start
if ((err = snd_pcm_start(alsa_handler)) < 0)
{
printf("alsa-reset: pcm start error: %s\n", snd_strerror(err));
return;
}
#endif
}
/*
plays 'len' bytes of 'data'
returns: number of bytes played
*/
static int play(void* data, int len, int flags)
{
int got_len;
got_len = snd_pcm_writei(alsa_handler, data, len / 4);
//if ((got_len = snd_pcm_writei(alsa_handler, data, (len/ao_bps))) != (len/ao_bps)) {
//SHOULD BE FIXED
if (got_len == -EPIPE) /* underrun? */
{
printf("alsa-play: alsa underrun, resetting stream\n");
if ((got_len = snd_pcm_prepare(alsa_handler)) < 0)
{
printf("alsa-play: playback prepare error: %s\n", snd_strerror(got_len));
return(0);
}
if ((got_len = snd_pcm_writei(alsa_handler, data, (len/ao_bps))) != (len/ao_bps))
{
printf("alsa-play: write error after reset: %s - giving up\n",
snd_strerror(got_len));
return(0);
}
return(len); /* 2nd write was ok */
}
return(len);
//}
}
/* how many byes are free in the buffer */
static int get_space()
{
snd_pcm_status_t *status;
int ret;
if ((ret = snd_pcm_status_malloc(&status)) < 0)
{
printf("alsa-space: memory allocation error: %s\n", snd_strerror(ret));
return(0);
}
if ((ret = snd_pcm_status(alsa_handler, status)) < 0)
{
printf("alsa-space: cannot get pcm status: %s\n", snd_strerror(ret));
return(0);
}
switch(snd_pcm_status_get_state(status))
{
case SND_PCM_STATE_OPEN:
case SND_PCM_STATE_PREPARED:
case SND_PCM_STATE_RUNNING:
ret = snd_pcm_status_get_avail(status) * ao_bps;
break;
default:
ret = 0;
}
snd_pcm_status_free(status);
if (ret < 0)
ret = 0;
return(ret);
}
/* how many unplayed bytes are in the buffer */
static int get_delay()
{
snd_pcm_status_t *status;
int ret;
if ((ret = snd_pcm_status_malloc(&status)) < 0)
{
printf("alsa-delay: memory allocation error: %s\n", snd_strerror(ret));
return(0);
}
if ((ret = snd_pcm_status(alsa_handler, status)) < 0)
{
printf("alsa-delay: cannot get pcm status: %s\n", snd_strerror(ret));
return(0);
}
switch(snd_pcm_status_get_state(status))
{
case SND_PCM_STATE_OPEN:
case SND_PCM_STATE_PREPARED:
case SND_PCM_STATE_RUNNING:
ret = snd_pcm_status_get_delay(status) * ao_bps;
break;
default:
ret = 0;
}
snd_pcm_status_free(status);
if (ret < 0)
ret = 0;
return(ret);
}
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