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/*****************************************************************
* gmerlin-avdecoder - a general purpose multimedia decoding library
*
* Copyright (c) 2001 - 2012 Members of the Gmerlin project
* gmerlin-general@lists.sourceforge.net
* http://gmerlin.sourceforge.net
*
* This program 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.
*
* This program 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, see <http://www.gnu.org/licenses/>.
* *****************************************************************/
#include <config.h>
#include <stdlib.h>
#include <avdec_private.h>
#define TRACK_INTERLACING (1<<0)
#define TRACK_FRAMERATE (1<<1)
struct bgav_video_format_tracker_s
{
bgav_stream_t * s;
int do_track;
bgav_packet_source_t src;
bgav_packet_t * output_packet;
int eof;
gavl_framerate_mode_t fps_mode;
int last_frame_duration;
/* Interlacing flags */
int have_top;
int have_bottom;
int have_progressive;
};
static void set_eof(bgav_video_format_tracker_t * ft)
{
if(ft->eof)
return;
if(ft->do_track & TRACK_FRAMERATE)
{
ft->s->data.video.format->framerate_mode = ft->fps_mode;
if(ft->fps_mode == GAVL_FRAMERATE_CONSTANT)
ft->s->data.video.format->frame_duration = ft->last_frame_duration;
}
if(ft->do_track & TRACK_INTERLACING)
{
if(ft->have_progressive)
{
if(ft->have_top)
{
if(ft->have_bottom)
{
/* progressive + top + bottom */
ft->s->data.video.format->interlace_mode = GAVL_INTERLACE_MIXED;
}
else
{
/* progressive + top + !bottom */
ft->s->data.video.format->interlace_mode = GAVL_INTERLACE_MIXED_TOP;
}
}
else /* !ft->have_top */
{
if(ft->have_bottom)
{
/* progressive + !top + bottom */
ft->s->data.video.format->interlace_mode = GAVL_INTERLACE_MIXED_BOTTOM;
}
else
{
/* progressive + !top + !bottom */
ft->s->data.video.format->interlace_mode = GAVL_INTERLACE_NONE;
}
}
}
else
{
if(ft->have_top)
{
if(ft->have_bottom)
{
/* !progressive + top + bottom */
ft->s->data.video.format->interlace_mode = GAVL_INTERLACE_MIXED;
}
else
{
/* !progressive + top + !bottom */
ft->s->data.video.format->interlace_mode = GAVL_INTERLACE_TOP_FIRST;
}
}
else /* !ft->have_top */
{
if(ft->have_bottom)
{
/* !progressive + !top + bottom */
ft->s->data.video.format->interlace_mode = GAVL_INTERLACE_BOTTOM_FIRST;
}
else
{
/* !progressive + !top + !bottom */
ft->s->data.video.format->interlace_mode = GAVL_INTERLACE_MIXED;
}
}
}
}
ft->do_track = 0;
ft->eof = 1;
}
static gavl_source_status_t
peek_func(void * ft1, bgav_packet_t ** ret, int force)
{
gavl_source_status_t st;
bgav_video_format_tracker_t * ft = ft1;
st = ft->src.peek_func(ft->src.data, ret, force);
if(st == GAVL_SOURCE_EOF)
set_eof(ft);
return st;
}
static gavl_source_status_t
get_func(void * ft1, bgav_packet_t ** ret)
{
gavl_source_status_t st;
bgav_video_format_tracker_t * ft = ft1;
st = ft->src.get_func(ft->src.data, ret);
if(st == GAVL_SOURCE_EOF)
{
set_eof(ft);
return st;
}
if(st != GAVL_SOURCE_OK)
return st;
/* Check what we have */
if(ft->do_track & TRACK_FRAMERATE)
{
if((ft->last_frame_duration >= 0) &&
((*ret)->duration != ft->last_frame_duration))
ft->fps_mode = GAVL_FRAMERATE_VARIABLE;
ft->last_frame_duration = (*ret)->duration;
}
if(ft->do_track & TRACK_INTERLACING)
{
switch((*ret)->ilace)
{
case GAVL_INTERLACE_NONE:
ft->have_progressive = 1;
break;
case GAVL_INTERLACE_TOP_FIRST:
ft->have_top = 1;
break;
case GAVL_INTERLACE_BOTTOM_FIRST:
ft->have_bottom = 1;
break;
default:
break;
}
}
return GAVL_SOURCE_OK;
}
bgav_video_format_tracker_t *
bgav_video_format_tracker_create(bgav_stream_t * s)
{
bgav_video_format_tracker_t * ret;
ret = calloc(1, sizeof(*ret));
ret->s = s;
bgav_packet_source_copy(&ret->src, &s->src);
s->src.get_func = get_func;
s->src.peek_func = peek_func;
s->src.data = ret;
switch(s->data.video.format->interlace_mode)
{
case GAVL_INTERLACE_MIXED: /*!< Use interlace_mode of the frames */
case GAVL_INTERLACE_MIXED_TOP: /*!< Progressive + top */
case GAVL_INTERLACE_MIXED_BOTTOM: /*!< Progressive + bottom */
ret->do_track |= TRACK_INTERLACING;
break;
default:
break;
}
if(s->data.video.format->framerate_mode == GAVL_FRAMERATE_VARIABLE)
{
ret->do_track |= TRACK_FRAMERATE;
ret->last_frame_duration = -1;
ret->fps_mode = GAVL_FRAMERATE_CONSTANT;
}
return ret;
}
void bgav_video_format_tracker_destroy(bgav_video_format_tracker_t *ft)
{
free(ft);
}
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