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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/>.
* *****************************************************************/
/* PNG decoder for quicktime and avi */
#include <stdlib.h>
#include <string.h>
#include <png.h>
#include <config.h>
#include <avdec_private.h>
#include <codecs.h>
#include <pngreader.h>
#define LOG_DOMAIN "video_png"
typedef struct
{
bgav_png_reader_t * png_reader;
int have_header;
gavl_video_format_t format;
} png_priv_t;
// static int frame_counter = 0;
static gavl_source_status_t
decode_png(bgav_stream_t * s, gavl_video_frame_t * frame)
{
png_priv_t * priv;
bgav_packet_t * p = NULL;
gavl_source_status_t st;
priv = s->decoder_priv;
if((st = bgav_stream_get_packet_read(s, &p)) != GAVL_SOURCE_OK)
return st;
// bgav_packet_save(p, "frame.png");
if(!bgav_png_reader_read_header(s->opt,
priv->png_reader,
p->data, p->data_size,
s->data.video.format))
{
return GAVL_SOURCE_EOF;
}
/* We decode only if we have a frame */
if(frame)
{
if(!priv->have_header &&
!bgav_png_reader_read_header(s->opt,
priv->png_reader,
p->data, p->data_size,
&priv->format))
return GAVL_SOURCE_EOF;
if(!bgav_png_reader_read_image(priv->png_reader, frame))
return GAVL_SOURCE_EOF;
priv->have_header = 0;
bgav_set_video_frame_from_packet(p, frame);
frame->src_rect.w = priv->format.image_width;
frame->src_rect.h = priv->format.image_height;
}
bgav_stream_done_packet_read(s, p);
return GAVL_SOURCE_OK;
}
static int init_png(bgav_stream_t * s)
{
png_priv_t * priv;
priv = calloc(1, sizeof(*priv));
s->decoder_priv = priv;
priv->png_reader = bgav_png_reader_create(s->data.video.depth);
gavl_dictionary_set_string(s->m, GAVL_META_FORMAT, "PNG");
return 1;
}
static void close_png(bgav_stream_t * s)
{
png_priv_t * priv = s->decoder_priv;
if(priv->png_reader)
bgav_png_reader_destroy(priv->png_reader);
free(priv);
}
static void resync_png(bgav_stream_t * s)
{
png_priv_t * priv = s->decoder_priv;
priv = s->decoder_priv;
bgav_png_reader_reset(priv->png_reader);
priv->have_header = 0;
}
static bgav_video_decoder_t decoder =
{
.name = "PNG video decoder",
.fourccs = bgav_png_fourccs,
.init = init_png,
.decode = decode_png,
.resync = resync_png,
.close = close_png,
.resync = NULL,
};
void bgav_init_video_decoders_png()
{
bgav_video_decoder_register(&decoder);
}
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