[544d3b]: src / xine-engine / metronom.c  Maximize  Restore  History

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/*
* Copyright (C) 2000-2003 the xine project
*
* This file is part of xine, a free video player.
*
* xine is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* xine is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <time.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <math.h>
#include <string.h>
#include <errno.h>
#define LOG_MODULE "metronom"
#define LOG_VERBOSE
/*
#define LOG
#define LOG_AUDIO
*/
#define METRONOM_INTERNAL
#define METRONOM_CLOCK_INTERNAL
#include "xine_internal.h"
#include "metronom.h"
#include "xineutils.h"
#define MAX_AUDIO_DELTA 1600
#define AUDIO_SAMPLE_NUM 32768
#define WRAP_THRESHOLD 120000
#define MAX_NUM_WRAP_DIFF 10
#define MAX_SCR_PROVIDERS 10
#define VIDEO_DRIFT_TOLERANCE 45000
#define AUDIO_DRIFT_TOLERANCE 45000
/* metronom video modes */
#define VIDEO_PREDICTION_MODE 0 /* use pts + frame duration */
#define VIDEO_PTS_MODE 1 /* use only pts */
/* redefine abs as macro to handle 64-bit diffs.
i guess llabs may not be available everywhere */
#define abs(x) ( ((x)<0) ? -(x) : (x) )
/*
* ****************************************
* primary SCR plugin:
* unix System Clock Reference
* ****************************************
*/
typedef struct unixscr_s {
scr_plugin_t scr;
struct timeval cur_time;
int64_t cur_pts;
double speed_factor;
pthread_mutex_t lock;
} unixscr_t;
static int unixscr_get_priority (scr_plugin_t *scr) {
return 5; /* low priority */
}
/* Only call this when already mutex locked */
static void unixscr_set_pivot (unixscr_t *this) {
struct timeval tv;
int64_t pts;
double pts_calc;
xine_monotonic_clock(&tv, NULL);
pts_calc = (tv.tv_sec - this->cur_time.tv_sec) * this->speed_factor;
pts_calc += (tv.tv_usec - this->cur_time.tv_usec) * this->speed_factor / 1e6;
pts = this->cur_pts + pts_calc;
/* This next part introduces a one off inaccuracy
* to the scr due to rounding tv to pts.
*/
this->cur_time.tv_sec=tv.tv_sec;
this->cur_time.tv_usec=tv.tv_usec;
this->cur_pts=pts;
return ;
}
static int unixscr_set_speed (scr_plugin_t *scr, int speed) {
unixscr_t *this = (unixscr_t*) scr;
pthread_mutex_lock (&this->lock);
unixscr_set_pivot( this );
this->speed_factor = (double) speed * 90000.0 / XINE_FINE_SPEED_NORMAL;
pthread_mutex_unlock (&this->lock);
return speed;
}
static void unixscr_adjust (scr_plugin_t *scr, int64_t vpts) {
unixscr_t *this = (unixscr_t*) scr;
struct timeval tv;
pthread_mutex_lock (&this->lock);
xine_monotonic_clock(&tv, NULL);
this->cur_time.tv_sec=tv.tv_sec;
this->cur_time.tv_usec=tv.tv_usec;
this->cur_pts = vpts;
pthread_mutex_unlock (&this->lock);
}
static void unixscr_start (scr_plugin_t *scr, int64_t start_vpts) {
unixscr_t *this = (unixscr_t*) scr;
pthread_mutex_lock (&this->lock);
xine_monotonic_clock(&this->cur_time, NULL);
this->cur_pts = start_vpts;
pthread_mutex_unlock (&this->lock);
unixscr_set_speed (&this->scr, XINE_FINE_SPEED_NORMAL);
}
static int64_t unixscr_get_current (scr_plugin_t *scr) {
unixscr_t *this = (unixscr_t*) scr;
struct timeval tv;
int64_t pts;
double pts_calc;
pthread_mutex_lock (&this->lock);
xine_monotonic_clock(&tv, NULL);
pts_calc = (tv.tv_sec - this->cur_time.tv_sec) * this->speed_factor;
pts_calc += (tv.tv_usec - this->cur_time.tv_usec) * this->speed_factor / 1e6;
pts = this->cur_pts + pts_calc;
pthread_mutex_unlock (&this->lock);
return pts;
}
static void unixscr_exit (scr_plugin_t *scr) {
unixscr_t *this = (unixscr_t*) scr;
pthread_mutex_destroy (&this->lock);
free(this);
}
static scr_plugin_t *XINE_MALLOC unixscr_init () {
unixscr_t *this;
this = calloc(1, sizeof(unixscr_t));
this->scr.interface_version = 3;
this->scr.get_priority = unixscr_get_priority;
this->scr.set_fine_speed = unixscr_set_speed;
this->scr.adjust = unixscr_adjust;
this->scr.start = unixscr_start;
this->scr.get_current = unixscr_get_current;
this->scr.exit = unixscr_exit;
pthread_mutex_init (&this->lock, NULL);
unixscr_set_speed (&this->scr, XINE_SPEED_PAUSE);
lprintf("xine-scr_init complete\n");
return &this->scr;
}
/*
* ****************************************
* master clock feature
* ****************************************
*/
static void metronom_start_clock (metronom_clock_t *this, int64_t pts) {
scr_plugin_t** scr;
lprintf("start_clock (at %" PRId64 ")\n", pts);
for (scr = this->scr_list; scr < this->scr_list+MAX_SCR_PROVIDERS; scr++)
if (*scr) (*scr)->start(*scr, pts);
this->speed = XINE_FINE_SPEED_NORMAL;
}
static int64_t metronom_get_current_time (metronom_clock_t *this) {
return this->scr_master->get_current(this->scr_master);
}
static void metronom_stop_clock(metronom_clock_t *this) {
scr_plugin_t** scr;
for (scr = this->scr_list; scr < this->scr_list+MAX_SCR_PROVIDERS; scr++)
if (*scr) (*scr)->set_fine_speed(*scr, XINE_SPEED_PAUSE);
}
static void metronom_resume_clock(metronom_clock_t *this) {
scr_plugin_t** scr;
for (scr = this->scr_list; scr < this->scr_list+MAX_SCR_PROVIDERS; scr++)
if (*scr) (*scr)->set_fine_speed(*scr, XINE_FINE_SPEED_NORMAL);
}
static void metronom_adjust_clock(metronom_clock_t *this, int64_t desired_pts) {
if (this->scr_adjustable)
this->scr_master->adjust(this->scr_master, desired_pts);
}
static int metronom_set_speed (metronom_clock_t *this, int speed) {
scr_plugin_t **scr;
int true_speed;
true_speed = this->scr_master->set_fine_speed (this->scr_master, speed);
this->speed = true_speed;
for (scr = this->scr_list; scr < this->scr_list+MAX_SCR_PROVIDERS; scr++)
if (*scr) (*scr)->set_fine_speed(*scr, true_speed);
return true_speed;
}
static void metronom_set_audio_rate (metronom_t *this, int64_t pts_per_smpls) {
pthread_mutex_lock (&this->lock);
this->pts_per_smpls = pts_per_smpls;
pthread_mutex_unlock (&this->lock);
lprintf("%" PRId64 " pts per %d samples\n", pts_per_smpls, AUDIO_SAMPLE_NUM);
}
static int64_t metronom_got_spu_packet (metronom_t *this, int64_t pts) {
int64_t vpts;
pthread_mutex_lock (&this->lock);
if (this->master) {
metronom_t *master = this->master;
pthread_mutex_lock(&this->master->lock);
pthread_mutex_unlock(&this->lock);
this->vpts_offset = this->master->vpts_offset;
this->spu_offset = this->master->spu_offset;
/* no recursion, please */
this->master = NULL;
vpts = master->got_spu_packet(this, pts);
this->master = master;
pthread_mutex_unlock(&this->master->lock);
return vpts;
}
vpts = pts + this->vpts_offset + this->spu_offset;
/* no vpts going backwards please */
if( vpts < this->spu_vpts )
vpts = this->spu_vpts;
this->spu_vpts = vpts;
pthread_mutex_unlock (&this->lock);
return vpts;
}
static void metronom_handle_discontinuity (metronom_t *this, int type,
int64_t disc_off) {
int64_t cur_time;
/* video_vpts and audio_vpts adjustements */
cur_time = this->xine->clock->get_current_time(this->xine->clock);
switch (type) {
case DISC_STREAMSTART:
case DISC_STREAMSEEK:
this->video_vpts = this->prebuffer + cur_time;
this->audio_vpts = this->video_vpts;
this->audio_vpts_rmndr = 0;
this->force_audio_jump = 1;
this->force_video_jump = 1;
this->video_drift = 0;
xprintf(this->xine, XINE_VERBOSITY_DEBUG,
"vpts adjusted with prebuffer to %" PRId64 "\n", this->video_vpts);
break;
case DISC_ABSOLUTE:
case DISC_RELATIVE:
if (this->video_vpts < cur_time) {
/* still frame */
if (this->audio_vpts > cur_time) {
/* still frame with audio */
this->video_vpts = this->audio_vpts;
xprintf(this->xine, XINE_VERBOSITY_DEBUG, "video vpts adjusted to audio vpts %" PRId64 "\n", this->video_vpts);
} else {
/* still frame, no audio */
this->video_vpts = this->prebuffer + cur_time;
this->audio_vpts = this->video_vpts;
this->audio_vpts_rmndr = 0;
this->force_video_jump = 1;
this->force_audio_jump = 1;
this->video_drift = 0;
xprintf(this->xine, XINE_VERBOSITY_DEBUG, "vpts adjusted with prebuffer to %" PRId64 "\n",
this->video_vpts);
}
} else {
/* video */
if (this->audio_vpts < cur_time) {
/* video, no sound */
this->audio_vpts = this->video_vpts;
this->audio_vpts_rmndr = 0;
xprintf(this->xine, XINE_VERBOSITY_DEBUG, "audio vpts adjusted to video vpts %" PRId64 "\n", this->video_vpts);
} else {
/* video + audio */
}
}
break;
}
lprintf("video_vpts: %" PRId64 ", audio_vpts: %" PRId64 "\n", this->video_vpts, this->audio_vpts);
/* vpts_offset adjustements */
switch (type) {
case DISC_STREAMSTART:
lprintf("DISC_STREAMSTART\n");
this->vpts_offset = this->video_vpts;
break;
case DISC_ABSOLUTE:
lprintf("DISC_ABSOLUTE\n");
this->vpts_offset = this->video_vpts - disc_off;
break;
case DISC_RELATIVE:
lprintf("DISC_RELATIVE\n");
this->vpts_offset = this->vpts_offset - disc_off;
break;
case DISC_STREAMSEEK:
lprintf("DISC_STREAMSEEK\n");
this->vpts_offset = this->video_vpts - disc_off;
break;
}
this->last_video_pts = 0;
this->last_audio_pts = 0;
}
static void metronom_handle_video_discontinuity (metronom_t *this, int type,
int64_t disc_off) {
pthread_mutex_lock (&this->lock);
if (this->master) {
/* slaves are currently not allowed to set discontinuities */
pthread_mutex_unlock(&this->lock);
return;
}
this->video_discontinuity_count++;
pthread_cond_signal (&this->video_discontinuity_reached);
xprintf(this->xine, XINE_VERBOSITY_DEBUG, "video discontinuity #%d, type is %d, disc_off %" PRId64 "\n",
this->video_discontinuity_count, type, disc_off);
if (this->have_audio) {
while (this->audio_discontinuity_count <
this->video_discontinuity_count) {
xprintf(this->xine, XINE_VERBOSITY_DEBUG, "waiting for audio discontinuity #%d\n",
this->video_discontinuity_count);
pthread_cond_wait (&this->audio_discontinuity_reached, &this->lock);
}
}
metronom_handle_discontinuity(this, type, disc_off);
this->discontinuity_handled_count++;
pthread_cond_signal (&this->video_discontinuity_reached);
pthread_mutex_unlock (&this->lock);
}
static void metronom_got_video_frame (metronom_t *this, vo_frame_t *img) {
int64_t vpts;
int64_t pts = img->pts;
int64_t diff;
pthread_mutex_lock (&this->lock);
if (this->master) {
metronom_t *master = this->master;
pthread_mutex_lock(&this->master->lock);
pthread_mutex_unlock(&this->lock);
if (!this->discontinuity_handled_count) {
/* we are not initialized yet */
if (this->master->video_vpts > this->master->audio_vpts)
this->video_vpts = this->audio_vpts = this->master->video_vpts;
else
this->video_vpts = this->audio_vpts = this->master->audio_vpts;
/* when being attached to the first master, do not drift into
* his vpts values but adopt at once */
this->force_audio_jump = 1;
this->force_video_jump = 1;
this->discontinuity_handled_count++;
}
this->vpts_offset = this->master->vpts_offset;
this->av_offset = this->master->av_offset;
/* no recursion, please */
this->master = NULL;
master->got_video_frame(this, img);
this->master = master;
pthread_mutex_unlock(&this->master->lock);
return;
}
lprintf("got_video_frame pts = %" PRId64 ", duration = %d\n", pts, img->duration);
this->img_cpt++;
if (img->duration) {
this->video_mode = VIDEO_PREDICTION_MODE;
this->img_duration = img->duration;
} else {
/* will skip the whole predicted vpts stuff */
this->video_mode = VIDEO_PTS_MODE;
}
if (pts && pts != this->last_video_pts) {
if (!img->duration) {
/* Compute the duration of previous frames using this formula:
* duration = (curent_pts - last_pts) / (frame count between the 2 pts)
* This duration will be used to predict the next frame vpts.
*/
if (this->last_video_pts && this->img_cpt) {
this->img_duration = (pts - this->last_video_pts) / this->img_cpt;
lprintf("computed frame_duration = %" PRId64 "\n", this->img_duration );
}
}
this->img_cpt = 0;
this->last_video_pts = pts;
/*
* compare predicted (this->video_vpts) and given (pts+vpts_offset)
* pts values - hopefully they will be the same
* if not, for small diffs try to interpolate
* for big diffs: jump
*/
vpts = pts + this->vpts_offset;
if (this->video_mode == VIDEO_PREDICTION_MODE) {
diff = this->video_vpts - vpts;
lprintf("video diff is %" PRId64 " (predicted %" PRId64 ", given %" PRId64 ")\n", diff, this->video_vpts, vpts);
if ((abs (diff) > VIDEO_DRIFT_TOLERANCE) || (this->force_video_jump)) {
this->force_video_jump = 0;
this->video_vpts = vpts;
this->video_drift = 0;
xprintf(this->xine, XINE_VERBOSITY_DEBUG, "video jump\n");
} else {
this->video_drift = diff;
this->video_drift_step = diff / 30;
/* this will fix video drift with a constant compensation each
frame for about 1 second of video. */
if (diff) lprintf("video drift, drift is %" PRId64 "\n", this->video_drift);
}
} else {
/* VIDEO_PTS_MODE: do not use the predicted value */
this->video_vpts = vpts;
}
}
img->vpts = this->video_vpts + this->av_offset;
if (this->video_mode == VIDEO_PREDICTION_MODE) {
lprintf("video vpts for %10"PRId64" : %10"PRId64" (duration:%d drift:%" PRId64 " step:%" PRId64 ")\n",
pts, this->video_vpts, img->duration, this->video_drift, this->video_drift_step );
if (this->video_drift * this->video_drift_step > 0) {
img->duration -= this->video_drift_step;
this->img_duration = img->duration;
this->video_drift -= this->video_drift_step;
}
}
/* We need to update this->video_vpts is both modes.
* this->video_vpts is used as the next frame vpts if next frame pts=0
*/
this->video_vpts += this->img_duration;
pthread_mutex_unlock (&this->lock);
}
static void metronom_handle_audio_discontinuity (metronom_t *this, int type,
int64_t disc_off) {
pthread_mutex_lock (&this->lock);
if (this->master) {
/* slaves are currently not allowed to set discontinuities */
pthread_mutex_unlock(&this->lock);
return;
}
this->audio_discontinuity_count++;
pthread_cond_signal (&this->audio_discontinuity_reached);
xprintf(this->xine, XINE_VERBOSITY_DEBUG, "audio discontinuity #%d, type is %d, disc_off %" PRId64 "\n",
this->audio_discontinuity_count, type, disc_off);
if (this->have_video) {
/* next_vpts_offset, in_discontinuity is handled in expect_video_discontinuity */
while ( this->audio_discontinuity_count >
this->discontinuity_handled_count ) {
xprintf(this->xine, XINE_VERBOSITY_DEBUG, "waiting for in_discontinuity update #%d\n",
this->audio_discontinuity_count);
pthread_cond_wait (&this->video_discontinuity_reached, &this->lock);
}
} else {
metronom_handle_discontinuity(this, type, disc_off);
}
this->audio_samples = 0;
this->audio_drift_step = 0;
pthread_mutex_unlock (&this->lock);
}
static int64_t metronom_got_audio_samples (metronom_t *this, int64_t pts,
int nsamples) {
int64_t vpts;
int64_t diff;
lprintf("got %d audio samples, pts is %" PRId64 ", last pts = %" PRId64 "\n", nsamples, pts, this->last_audio_pts);
lprintf("AUDIO pts from last= %" PRId64 "\n", pts-this->last_audio_pts);
pthread_mutex_lock (&this->lock);
if (this->master) {
metronom_t *master = this->master;
pthread_mutex_lock(&this->master->lock);
pthread_mutex_unlock(&this->lock);
if (!this->discontinuity_handled_count) {
/* we are not initialized yet */
if (this->master->video_vpts > this->master->audio_vpts)
this->video_vpts = this->audio_vpts = this->master->video_vpts;
else
this->video_vpts = this->audio_vpts = this->master->audio_vpts;
this->audio_vpts_rmndr = 0;
/* when being attached to the first master, do not drift into
* his vpts values but adopt at once */
this->force_audio_jump = 1;
this->force_video_jump = 1;
this->discontinuity_handled_count++;
}
this->vpts_offset = this->master->vpts_offset;
/* no recursion, please */
this->master = NULL;
vpts = master->got_audio_samples(this, pts, nsamples);
this->master = master;
pthread_mutex_unlock(&this->master->lock);
return vpts;
}
if (pts && pts != this->last_audio_pts) {
vpts = pts + this->vpts_offset;
diff = this->audio_vpts - vpts;
this->last_audio_pts = pts;
/* compare predicted and given vpts */
if((abs(diff) > AUDIO_DRIFT_TOLERANCE) || (this->force_audio_jump)) {
this->force_audio_jump = 0;
this->audio_vpts = vpts;
this->audio_vpts_rmndr = 0;
this->audio_drift_step = 0;
xprintf(this->xine, XINE_VERBOSITY_DEBUG, "audio jump, diff=%" PRId64 "\n", diff);
} else {
if( this->audio_samples ) {
/* calculate drift_step to recover vpts errors */
lprintf("audio diff = %" PRId64 " \n", diff );
diff *= AUDIO_SAMPLE_NUM;
diff /= this->audio_samples * 4;
/* drift_step is not allowed to change rate by more than 25% */
if( diff > this->pts_per_smpls/4 )
diff = this->pts_per_smpls/4;
if( diff < -this->pts_per_smpls/4 )
diff = -this->pts_per_smpls/4;
this->audio_drift_step = diff;
lprintf("audio_drift = %" PRId64 ", pts_per_smpls = %" PRId64 "\n", diff, this->pts_per_smpls);
}
}
this->audio_samples = 0;
}
vpts = this->audio_vpts;
/* drift here is caused by streams where nominal sample rate differs from
* the rate of which pts increments. fixing the audio_vpts won't do us any
* good because sound card won't play it faster or slower just because
* we want. however, adding the error to the vpts_offset will force video
* to change it's frame rate to keep in sync with us.
*
* Since we are using integer division below, it can happen that we lose
* precision for the calculated duration in vpts for each audio buffer
* (< 1 PTS, e.g. 0.25 PTS during playback of most DVDs with LPCM audio).
* This would lead to a situation where the sound card actually needs
* more time to play back the buffers, than the audio buffer's vpts field
* indicates. This makes audio_out loop think we are in sync with the
* soundcard, while we actually are not. So that's why there is the extra
* modulo calculation, to keep track of the truncated, fractional part.
*/
this->audio_vpts_rmndr += nsamples * this->pts_per_smpls % AUDIO_SAMPLE_NUM;
this->audio_vpts += nsamples * this->pts_per_smpls / AUDIO_SAMPLE_NUM;
if (this->audio_vpts_rmndr >= AUDIO_SAMPLE_NUM) {
this->audio_vpts += 1;
this->audio_vpts_rmndr -= AUDIO_SAMPLE_NUM;
}
this->audio_samples += nsamples;
this->vpts_offset += nsamples * this->audio_drift_step / AUDIO_SAMPLE_NUM;
lprintf("audio vpts for %10"PRId64" : %10"PRId64"\n", pts, vpts);
pthread_mutex_unlock (&this->lock);
return vpts;
}
static void metronom_set_option (metronom_t *this, int option, int64_t value) {
pthread_mutex_lock (&this->lock);
if (this->master) {
/* pass the option on to the master */
this->master->set_option(this->master, option, value);
pthread_mutex_unlock(&this->lock);
return;
}
switch (option) {
case METRONOM_AV_OFFSET:
this->av_offset = value;
xprintf(this->xine, XINE_VERBOSITY_LOG, "av_offset=%" PRId64 " pts\n", this->av_offset);
break;
case METRONOM_SPU_OFFSET:
this->spu_offset = value;
xprintf(this->xine, XINE_VERBOSITY_LOG, "spu_offset=%" PRId64 " pts\n", this->spu_offset);
break;
case METRONOM_ADJ_VPTS_OFFSET:
this->audio_vpts += value;
this->audio_vpts_rmndr = 0;
/* that message should be rare, please report otherwise.
* when xine is in some sort of "steady state" hearing it
* once in a while means a small sound card drift (or system
* clock drift -- who knows?). nothing to worry about.
*/
xprintf(this->xine, XINE_VERBOSITY_LOG, "fixing sound card drift by %" PRId64 " pts\n", value);
break;
case METRONOM_PREBUFFER:
this->prebuffer = value;
xprintf(this->xine, XINE_VERBOSITY_LOG, "prebuffer=%" PRId64 " pts\n", this->prebuffer);
break;
default:
xprintf(this->xine, XINE_VERBOSITY_NONE, "unknown option in set_option: %d\n", option);
}
pthread_mutex_unlock (&this->lock);
}
static void metronom_clock_set_option (metronom_clock_t *this,
int option, int64_t value) {
pthread_mutex_lock (&this->lock);
switch (option) {
case CLOCK_SCR_ADJUSTABLE:
this->scr_adjustable = value;
break;
default:
xprintf(this->xine, XINE_VERBOSITY_NONE, "unknown option in set_option: %d\n", option);
}
pthread_mutex_unlock (&this->lock);
}
static int64_t metronom_get_option (metronom_t *this, int option) {
if (this->master)
return this->master->get_option(this->master, option);
switch (option) {
case METRONOM_AV_OFFSET:
return this->av_offset;
case METRONOM_SPU_OFFSET:
return this->spu_offset;
case METRONOM_FRAME_DURATION:
return this->img_duration;
case METRONOM_VPTS_OFFSET:
return this->vpts_offset;
case METRONOM_PREBUFFER:
return this->prebuffer;
}
xprintf(this->xine, XINE_VERBOSITY_NONE, "unknown option in get_option: %d\n", option);
return 0;
}
static int64_t metronom_clock_get_option (metronom_clock_t *this, int option) {
switch (option) {
case CLOCK_SCR_ADJUSTABLE:
return this->scr_adjustable;
}
xprintf(this->xine, XINE_VERBOSITY_NONE, "unknown option in get_option: %d\n", option);
return 0;
}
static void metronom_set_master(metronom_t *this, metronom_t *master) {
metronom_t *old_master = this->master;
pthread_mutex_lock(&this->lock);
/* someone might currently be copying values from the old master,
* so we need his lock too */
if (old_master) pthread_mutex_lock(&old_master->lock);
this->master = master;
/* new master -> we have to reinit */
this->discontinuity_handled_count = 0;
if (old_master) pthread_mutex_unlock(&old_master->lock);
pthread_mutex_unlock(&this->lock);
}
static scr_plugin_t* get_master_scr(metronom_clock_t *this) {
int select = -1, maxprio = 0, i;
/* find the SCR provider with the highest priority */
for (i=0; i<MAX_SCR_PROVIDERS; i++) if (this->scr_list[i]) {
scr_plugin_t *scr = this->scr_list[i];
if (maxprio < scr->get_priority(scr)) {
select = i;
maxprio = scr->get_priority(scr);
}
}
if (select < 0) {
xprintf(this->xine, XINE_VERBOSITY_NONE, "panic - no scr provider found!\n");
return NULL;
}
return this->scr_list[select];
}
static int metronom_register_scr (metronom_clock_t *this, scr_plugin_t *scr) {
int i;
if (scr->interface_version != 3) {
xprintf(this->xine, XINE_VERBOSITY_NONE,
"wrong interface version for scr provider!\n");
return -1;
}
for (i=0; i<MAX_SCR_PROVIDERS; i++)
if (this->scr_list[i] == NULL) break;
if (i >= MAX_SCR_PROVIDERS)
return -1; /* No free slot available */
scr->clock = this;
this->scr_list[i] = scr;
this->scr_master = get_master_scr(this);
return 0;
}
static void metronom_unregister_scr (metronom_clock_t *this, scr_plugin_t *scr) {
int i;
int64_t time;
/* never unregister scr_list[0]! */
for (i=1; i<MAX_SCR_PROVIDERS; i++)
if (this->scr_list[i] == scr)
break;
if (i >= MAX_SCR_PROVIDERS)
return; /* Not found */
this->scr_list[i] = NULL;
time = this->get_current_time(this);
/* master could have been adjusted, others must follow now */
for (i=0; i<MAX_SCR_PROVIDERS; i++)
if (this->scr_list[i]) this->scr_list[i]->adjust(this->scr_list[i], time);
this->scr_master = get_master_scr(this);
}
static int metronom_sync_loop (metronom_clock_t *this) {
struct timeval tv;
struct timespec ts;
scr_plugin_t** scr;
int64_t pts;
while (this->thread_running) {
/* synchronise every 5 seconds */
pthread_mutex_lock (&this->lock);
pts = this->scr_master->get_current(this->scr_master);
for (scr = this->scr_list; scr < this->scr_list+MAX_SCR_PROVIDERS; scr++)
if (*scr && *scr != this->scr_master) (*scr)->adjust(*scr, pts);
gettimeofday(&tv, NULL);
ts.tv_sec = tv.tv_sec + 5;
ts.tv_nsec = tv.tv_usec * 1000;
pthread_cond_timedwait (&this->cancel, &this->lock, &ts);
pthread_mutex_unlock (&this->lock);
}
return 0;
}
static void metronom_exit (metronom_t *this) {
pthread_mutex_destroy (&this->lock);
pthread_cond_destroy (&this->video_discontinuity_reached);
pthread_cond_destroy (&this->audio_discontinuity_reached);
free (this);
}
static void metronom_clock_exit (metronom_clock_t *this) {
scr_plugin_t** scr;
this->thread_running = 0;
pthread_mutex_lock (&this->lock);
pthread_cond_signal (&this->cancel);
pthread_mutex_unlock (&this->lock);
pthread_join (this->sync_thread, NULL);
pthread_mutex_destroy (&this->lock);
pthread_cond_destroy (&this->cancel);
for (scr = this->scr_list; scr < this->scr_list+MAX_SCR_PROVIDERS; scr++)
if (*scr) (*scr)->exit(*scr);
free (this->scr_list);
free (this);
}
metronom_t * _x_metronom_init (int have_video, int have_audio, xine_t *xine) {
metronom_t *this = calloc(1, sizeof (metronom_t));
this->set_audio_rate = metronom_set_audio_rate;
this->got_video_frame = metronom_got_video_frame;
this->got_audio_samples = metronom_got_audio_samples;
this->got_spu_packet = metronom_got_spu_packet;
this->handle_audio_discontinuity = metronom_handle_audio_discontinuity;
this->handle_video_discontinuity = metronom_handle_video_discontinuity;
this->set_option = metronom_set_option;
this->get_option = metronom_get_option;
this->set_master = metronom_set_master;
this->exit = metronom_exit;
this->xine = xine;
this->master = NULL;
pthread_mutex_init (&this->lock, NULL);
this->prebuffer = PREBUFFER_PTS_OFFSET;
this->av_offset = 0;
this->spu_offset = 0;
this->vpts_offset = 0;
/* initialize video stuff */
this->video_vpts = this->prebuffer;
this->video_drift = 0;
this->video_drift_step = 0;
this->video_discontinuity_count = 0;
this->discontinuity_handled_count = 0;
pthread_cond_init (&this->video_discontinuity_reached, NULL);
this->img_duration = 3000;
this->img_cpt = 0;
this->last_video_pts = 0;
this->last_audio_pts = 0;
/* initialize audio stuff */
this->have_video = have_video;
this->have_audio = have_audio;
this->audio_vpts = this->prebuffer;
this->audio_vpts_rmndr = 0;
this->audio_discontinuity_count = 0;
pthread_cond_init (&this->audio_discontinuity_reached, NULL);
return this;
}
metronom_clock_t *_x_metronom_clock_init(xine_t *xine)
{
metronom_clock_t *this = calloc(1, sizeof(metronom_clock_t));
int err;
this->set_option = metronom_clock_set_option;
this->get_option = metronom_clock_get_option;
this->start_clock = metronom_start_clock;
this->stop_clock = metronom_stop_clock;
this->resume_clock = metronom_resume_clock;
this->get_current_time = metronom_get_current_time;
this->adjust_clock = metronom_adjust_clock;
this->set_fine_speed = metronom_set_speed;
this->register_scr = metronom_register_scr;
this->unregister_scr = metronom_unregister_scr;
this->exit = metronom_clock_exit;
this->xine = xine;
this->scr_adjustable = 1;
this->scr_list = calloc(MAX_SCR_PROVIDERS, sizeof(void*));
this->register_scr(this, unixscr_init());
pthread_mutex_init (&this->lock, NULL);
pthread_cond_init (&this->cancel, NULL);
this->thread_running = 1;
if ((err = pthread_create(&this->sync_thread, NULL,
(void*(*)(void*)) metronom_sync_loop, this)) != 0)
xprintf(this->xine, XINE_VERBOSITY_NONE, "cannot create sync thread (%s)\n",
strerror(err));
return this;
}

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