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/*****************************************************************
* gmerlin-avdecoder - a general purpose multimedia decoding library
*
* Copyright (c) 2001 - 2024 Members of the Gmerlin project
* http://github.com/bplaum
*
* 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 <stdlib.h>
#include <string.h>
#include <avdec_private.h>
#include <parser.h>
#include <dirac_header.h>
#define LOG_DOMAIN "parse_dirac"
typedef struct
{
/* Sequence header */
bgav_dirac_sequence_header_t sh;
int have_sh;
int64_t pic_num_max;
int64_t pic_num_first;
int64_t pts_first;
} dirac_priv_t;
static void cleanup_dirac(bgav_packet_parser_t * parser)
{
free(parser->priv);
}
static void reset_dirac(bgav_packet_parser_t * parser)
{
dirac_priv_t * priv;
priv = parser->priv;
priv->pic_num_max = -1;
}
static void set_format(bgav_packet_parser_t * parser)
{
dirac_priv_t * priv = parser->priv;
/* Framerate */
if(!parser->vfmt->timescale || !parser->vfmt->frame_duration)
{
parser->vfmt->timescale = priv->sh.timescale;
parser->vfmt->frame_duration = priv->sh.frame_duration;
gavl_dictionary_set_int(parser->m, GAVL_META_STREAM_SAMPLE_TIMESCALE, parser->vfmt->timescale);
}
/* Image size */
if(!parser->vfmt->image_width || !parser->vfmt->image_height)
{
parser->vfmt->image_width = priv->sh.width;
parser->vfmt->image_height = priv->sh.height;
parser->vfmt->frame_width = priv->sh.width;
parser->vfmt->frame_height = priv->sh.height;
}
/* Pixel size */
if(!parser->vfmt->pixel_width || !parser->vfmt->pixel_height)
{
parser->vfmt->pixel_width = priv->sh.pixel_width;
parser->vfmt->pixel_height = priv->sh.pixel_height;
}
/* Interlacing */
if(priv->sh.source_sampling == 1)
{
if(priv->sh.top_first)
parser->vfmt->interlace_mode = GAVL_INTERLACE_TOP_FIRST;
else
parser->vfmt->interlace_mode = GAVL_INTERLACE_BOTTOM_FIRST;
}
else
parser->vfmt->interlace_mode = GAVL_INTERLACE_NONE;
}
static int parse_frame_dirac(bgav_packet_parser_t * parser,
bgav_packet_t * p)
{
int code, len;
dirac_priv_t * priv;
uint8_t * start = p->buf.buf;
uint8_t * end = p->buf.buf + p->buf.len;
bgav_dirac_picture_header_t ph;
priv = parser->priv;
#if 0
fprintf(stderr, "parse_frame_dirac %lld %lld\n",
p->position, p->data_size);
gavl_hexdump(start, 16, 16);
#endif
while(start < end)
{
code = bgav_dirac_get_code(start, end - start, &len);
switch(code)
{
case DIRAC_CODE_SEQUENCE:
if(!priv->have_sh)
{
if(!parser->ci->codec_header.len)
gavl_buffer_append_data(&parser->ci->codec_header, start, len);
if(!bgav_dirac_sequence_header_parse(&priv->sh,
start, end - start))
return 0;
// bgav_dirac_sequence_header_dump(&priv->sh);
priv->have_sh = 1;
// ret = PARSER_CONTINUE;
set_format(parser);
}
break;
case DIRAC_CODE_PICTURE:
if(!priv->have_sh)
{
PACKET_SET_SKIP(p);
return 1;
}
if(!bgav_dirac_picture_header_parse(&ph, start, end - start))
return 0;
// bgav_dirac_picture_header_dump(&ph);
if(priv->pic_num_first < 0)
{
priv->pic_num_first = ph.pic_num;
priv->pts_first = p->pts;
}
/* Generate true timestamp from picture counter */
p->pts = (ph.pic_num - priv->pic_num_first) *
parser->vfmt->frame_duration + priv->pts_first;
p->duration = parser->vfmt->frame_duration;
if(ph.num_refs == 0)
{
PACKET_SET_CODING_TYPE(p, GAVL_PACKET_TYPE_I);
priv->pic_num_max = ph.pic_num;
}
else if((priv->pic_num_max >= 0) &&
(ph.pic_num < priv->pic_num_max))
{
PACKET_SET_CODING_TYPE(p, GAVL_PACKET_TYPE_B);
}
else
{
PACKET_SET_CODING_TYPE(p, GAVL_PACKET_TYPE_P);
priv->pic_num_max = ph.pic_num;
}
if(p->duration <= 0)
p->duration = priv->sh.frame_duration;
return 1;
break;
case DIRAC_CODE_END:
fprintf(stderr, "Dirac code end %d\n", len);
break;
}
start += len;
}
return 0;
}
void bgav_packet_parser_init_dirac(bgav_packet_parser_t * parser)
{
dirac_priv_t * priv;
priv = calloc(1, sizeof(*priv));
parser->priv = priv;
if(parser->ci->codec_header.len)
{
if(bgav_dirac_sequence_header_parse(&priv->sh,
parser->ci->codec_header.buf,
parser->ci->codec_header.len))
{
priv->have_sh = 1;
set_format(parser);
// fprintf(stderr, "Got sequence header:\n");
// bgav_dirac_sequence_header_dump(&priv->sh);
}
}
priv->pic_num_first = -1;
priv->pts_first = GAVL_TIME_UNDEFINED;
priv->pic_num_max = -1;
// parser->parse = parse_dirac;
parser->parse_frame = parse_frame_dirac;
parser->cleanup = cleanup_dirac;
parser->reset = reset_dirac;
}
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