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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 <string.h>
#include <stdlib.h>
#include <avdec_private.h>
#include <parser.h>
#include <videoparser_priv.h>
typedef struct
{
int have_format;
} jpeg_priv_t;
static gavl_pixelformat_t get_pixelformat(bgav_packet_t * p)
{
const uint8_t * ptr = p->data;
int marker;
int len;
int components[3];
int sub_h[3];
int sub_v[3];
while(1)
{
marker = GAVL_PTR_2_16BE(ptr); ptr+=2;
switch(marker)
{
case 0xFFD8:
// fprintf(stderr, "Got SOI\n");
break;
case 0xFFC0:
case 0xFFC1:
case 0xFFC2:
case 0xFFC3:
case 0xFFC5:
case 0xFFC6:
case 0xFFC7:
case 0xFFC8:
case 0xFFC9:
case 0xFFCa:
case 0xFFCb:
case 0xFFCd:
case 0xFFCe:
case 0xFFCf:
{
int i;
int num_components;
// gavl_hexdump(ptr, 16, 16);
len = GAVL_PTR_2_16BE(ptr); ptr+=2;
// fprintf(stderr, "Got SOF %d\n", len-2);
ptr++; // tmp = *ptr; ptr++;
// fprintf(stderr, "Bits: %d\n", tmp);
ptr+=2; // tmp = GAVL_PTR_2_16BE(ptr); ptr+=2;
// fprintf(stderr, "Height: %d\n", tmp);
ptr+=2; // tmp = GAVL_PTR_2_16BE(ptr); ptr+=2;
// fprintf(stderr, "Width: %d\n", tmp);
num_components = *ptr; ptr++;
// fprintf(stderr, "Components: %d\n", tmp);
for(i = 0; i < num_components; i++)
{
components[i] = *ptr; ptr++;
sub_h[i] = (*ptr) >> 4;
sub_v[i] = (*ptr) & 0xF;
ptr += 2; /* Skip huffman table */
// fprintf(stderr, "Component: ID: %d, sub_h: %d, sub_v: %d\n",
// components[i], sub_h[i], sub_v[i]);
}
if((num_components != 3) ||
(components[0] != 1) ||
(components[1] != 2) ||
(components[2] != 3) ||
(sub_h[1] != sub_h[2]) ||
(sub_v[1] != sub_v[2]))
{
return GAVL_PIXELFORMAT_NONE;
}
if((sub_h[0] == 1) &&
(sub_v[0] == 1) &&
(sub_h[1] == 1) &&
(sub_v[1] == 1))
return GAVL_YUVJ_444_P;
else if((sub_h[0] == 2) &&
(sub_v[0] == 2) &&
(sub_h[1] == 1) &&
(sub_v[1] == 1))
return GAVL_YUVJ_420_P;
else if((sub_h[0] == 2) &&
(sub_v[0] == 1) &&
(sub_h[1] == 1) &&
(sub_v[1] == 1))
return GAVL_YUVJ_422_P;
return 1;
}
break;
case 0xFFDA: // SOS
return 0;
break;
default:
len = GAVL_PTR_2_16BE(ptr); ptr+=2;
// fprintf(stderr, "Got %04x %d\n", marker, len-2);
ptr+=len-2;
break;
}
}
return GAVL_PIXELFORMAT_NONE;
}
static int parse_frame_jpeg(bgav_video_parser_t * parser, bgav_packet_t * p,
int64_t prs_orig)
{
jpeg_priv_t * priv = parser->priv;
PACKET_SET_CODING_TYPE(p, BGAV_CODING_TYPE_I);
/* Extract format */
if(!priv->have_format)
{
parser->s->data.video.format->pixelformat =
get_pixelformat(p);
priv->have_format = 1;
}
return PARSER_CONTINUE;
}
static void cleanup_jpeg(bgav_video_parser_t * parser)
{
jpeg_priv_t * priv = parser->priv;
free(priv);
}
void bgav_video_parser_init_jpeg(bgav_video_parser_t * parser)
{
jpeg_priv_t * priv;
priv = calloc(1, sizeof(*priv));
parser->priv = priv;
parser->parse_frame = parse_frame_jpeg;
parser->cleanup = cleanup_jpeg;
}
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