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/*
* Copyright (C) 2000-2002 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*
* network buffering control
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <unistd.h>
#include "net_buf_ctrl.h"
#define DEFAULT_LOW_WATER_MARK 1
#define DEFAULT_HIGH_WATER_MARK 5000 /* in millisecond */
#define VIDEO_FIFO_BUFS 499 /* 500 - 1 */
#define AUDIO_FIFO_BUFS 229 /* 230 - 1 */
/*
#define LOG
*/
struct nbc_s {
xine_stream_t *stream;
int buffering;
int low_water_mark;
int high_water_mark;
int fifo_full;
int progress;
};
static void report_progress (xine_stream_t *stream, int p) {
xine_event_t event;
xine_progress_data_t prg;
prg.description = _("Buffering...");
prg.percent = (p>100)?100:p;
event.type = XINE_EVENT_PROGRESS;
event.data = &prg;
event.data_length = sizeof (xine_progress_data_t);
xine_event_send (stream, &event);
}
void nbc_check_buffers (nbc_t *this) {
int fifo_fill, video_fifo_fill, audio_fifo_fill; /* number of buffers */
int data_length, video_data_length, audio_data_length; /* fifo length in second */
uint32_t video_data_size, audio_data_size; /* fifo size in bytes */
int video_bitrate, audio_bitrate;
int progress;
int video_fifo_progress, audio_fifo_progress;
video_fifo_fill = this->stream->video_fifo->size(this->stream->video_fifo);
if (this->stream->audio_fifo)
audio_fifo_fill = this->stream->audio_fifo->size(this->stream->audio_fifo);
else
audio_fifo_fill = 0;
fifo_fill = audio_fifo_fill + video_fifo_fill;
/* start buffering if fifos are empty */
if (fifo_fill == 0) {
if (!this->buffering) {
/* increase/decrease marks to adapt to stream/network needs */
if (!this->fifo_full) {
this->high_water_mark += this->high_water_mark / 4;
/* this->low_water_mark = this->high_water_mark/4; */
} else {
this->high_water_mark -= this->high_water_mark / 8;
}
this->buffering = 1;
this->progress = 0;
report_progress (this->stream, 0);
}
/* pause */
this->stream->xine->clock->set_speed (this->stream->xine->clock, XINE_SPEED_PAUSE);
this->stream->xine->clock->set_option (this->stream->xine->clock, CLOCK_SCR_ADJUSTABLE, 0);
if (this->stream->audio_out)
this->stream->audio_out->set_property(this->stream->audio_out,AO_PROP_PAUSED,2);
} else {
if (this->buffering) {
/* compute data length in fifos */
video_bitrate = this->stream->stream_info[XINE_STREAM_INFO_VIDEO_BITRATE];
audio_bitrate = this->stream->stream_info[XINE_STREAM_INFO_AUDIO_BITRATE];
if (video_bitrate) {
video_data_size = this->stream->video_fifo->data_size(this->stream->video_fifo);
video_data_length = (8000 * video_data_size) / video_bitrate;
} else {
video_data_length = 0;
}
if (this->stream->audio_fifo) {
if (audio_bitrate) {
audio_data_size = this->stream->audio_fifo->data_size(this->stream->audio_fifo);
audio_data_length = (8000 * audio_data_size) / audio_bitrate;
} else {
audio_data_length = 0;
}
} else {
audio_data_length = 0;
}
data_length = (video_data_length > audio_data_length) ? video_data_length : audio_data_length;
#ifdef LOG
printf("net_buf_ctrl: vff=%d, aff=%d, vdl=%d, adl=%d, dl=%d\n",
video_fifo_fill, audio_fifo_fill,
video_data_length, audio_data_length, data_length);
#endif
/* stop buffering if fifos are filled enough */
if ((data_length >= this->high_water_mark) ||
(video_fifo_fill >= VIDEO_FIFO_BUFS) || /* there is 512 video buffers */
(audio_fifo_fill >= AUDIO_FIFO_BUFS) ) { /* there is 230 audio buffers */
/* unpause */
this->stream->xine->clock->set_speed (this->stream->xine->clock, XINE_SPEED_NORMAL);
this->stream->xine->clock->set_option (this->stream->xine->clock, CLOCK_SCR_ADJUSTABLE, 1);
if (this->stream->audio_out)
this->stream->audio_out->set_property(this->stream->audio_out,AO_PROP_PAUSED,0);
report_progress (this->stream, 100);
this->buffering = 0;
this->fifo_full = (data_length < this->high_water_mark);
} else {
progress = (data_length * 100) / this->high_water_mark;
if (!progress) {
/* bitrate is not known */
video_fifo_progress = (100 * video_fifo_fill) / VIDEO_FIFO_BUFS;
audio_fifo_progress = (100 * audio_fifo_fill) / AUDIO_FIFO_BUFS;
progress = (video_fifo_progress > audio_fifo_progress)?
video_fifo_progress : audio_fifo_progress;
}
if (progress != this->progress) {
report_progress (this->stream, progress);
this->progress = progress;
}
}
} else {
/* fifos are ok */
}
}
}
void nbc_close (nbc_t *this) {
this->stream->xine->clock->set_option (this->stream->xine->clock, CLOCK_SCR_ADJUSTABLE, 1);
free (this);
}
nbc_t *nbc_init (xine_stream_t *stream) {
nbc_t *this = (nbc_t *) malloc (sizeof (nbc_t));
this->stream = stream;
this->buffering = 0;
this->low_water_mark = DEFAULT_LOW_WATER_MARK;
this->high_water_mark = DEFAULT_HIGH_WATER_MARK;
this->progress = 0;
return this;
}
void nbc_set_high_water_mark(nbc_t *this, int value) {
this->high_water_mark = value;
}
void nbc_set_low_water_mark(nbc_t *this, int value) {
this->low_water_mark = value;
}
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