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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 <string.h>
#include <avdec_private.h>
#include <cavs_header.h>
#include <bitstream.h>
#define FRAME_I 0xb3
#define FRAME_PB 0xb6
#define SEQUENCE 0xb0
int bgav_cavs_get_start_code(const uint8_t * data)
{
switch(data[3])
{
case SEQUENCE:
return CAVS_CODE_SEQUENCE;
break;
case FRAME_I:
return CAVS_CODE_PICTURE_I;
break;
case FRAME_PB:
return CAVS_CODE_PICTURE_PB;
break;
}
return 0;
}
int bgav_cavs_sequence_header_read(bgav_cavs_sequence_header_t * ret,
const uint8_t * buffer, int len)
{
bgav_bitstream_t b;
int dummy;
buffer+=4;
len -= 4;
bgav_bitstream_init(&b, buffer, len);
if(!bgav_bitstream_get(&b, &ret->profile_id, 8) ||
!bgav_bitstream_get(&b, &ret->level_id, 8) ||
!bgav_bitstream_get(&b, &ret->progressive_sequence, 1) ||
!bgav_bitstream_get(&b, &ret->horizontal_size, 14) ||
!bgav_bitstream_get(&b, &ret->vertical_size, 14) ||
!bgav_bitstream_get(&b, &ret->chromat_fromat, 2) ||
!bgav_bitstream_get(&b, &ret->sample_precision, 3) ||
!bgav_bitstream_get(&b, &ret->aspect_ratio, 4) ||
!bgav_bitstream_get(&b, &ret->frame_rate_code, 4) ||
!bgav_bitstream_get(&b, &ret->bit_rate_lower, 18) ||
!bgav_bitstream_get(&b, &dummy, 1) ||
!bgav_bitstream_get(&b, &ret->bit_rate_upper, 12) ||
!bgav_bitstream_get(&b, &ret->low_delay, 1))
return 0;
return len - bgav_bitstream_get_bits(&b) / 8;
}
void bgav_cavs_sequence_header_dump(const bgav_cavs_sequence_header_t * h)
{
gavl_dprintf("CAVS Sequence header\n");
gavl_dprintf(" profile_id: %d\n", h->profile_id);
gavl_dprintf(" level_id: %d\n", h->level_id);
gavl_dprintf(" progressive_sequence: %d\n", h->progressive_sequence);
gavl_dprintf(" horizontal_size: %d\n", h->horizontal_size);
gavl_dprintf(" vertical_size: %d\n", h->vertical_size);
gavl_dprintf(" chromat_fromat: %d\n", h->chromat_fromat);
gavl_dprintf(" sample_precision: %d\n", h->sample_precision);
gavl_dprintf(" aspect_ratio: %d\n", h->aspect_ratio);
gavl_dprintf(" frame_rate_code: %d\n", h->frame_rate_code);
gavl_dprintf(" bit_rate_lower: %d\n", h->bit_rate_lower);
/* market_bit */
gavl_dprintf(" bit_rate_upper: %d\n", h->bit_rate_upper);
gavl_dprintf(" low_delay: %d\n", h->low_delay);
}
int bgav_cavs_picture_header_read(bgav_cavs_picture_header_t * ret,
const uint8_t * buffer, int len,
const bgav_cavs_sequence_header_t * seq)
{
int sc = buffer[3];
bgav_bitstream_t b;
memset(ret, 0, sizeof(*ret));
// fprintf(stderr, "Read picture header\n");
// gavl_hexdump(buffer, 16, 16);
bgav_bitstream_init(&b, buffer + 4, len - 4);
if(!bgav_bitstream_get(&b, &ret->bbv_delay, 16))
return 0;
if(sc == FRAME_I)
{
ret->coding_type = GAVL_PACKET_TYPE_I;
if(!bgav_bitstream_get(&b, &ret->time_code_flag, 1))
return 0;
if(ret->time_code_flag &&
!bgav_bitstream_get(&b, &ret->time_code, 24))
return 0;
}
else
{
if(!bgav_bitstream_get(&b, &ret->picture_coding_type, 2))
return 0;
if(ret->picture_coding_type == 1)
ret->coding_type = GAVL_PACKET_TYPE_P;
else
ret->coding_type = GAVL_PACKET_TYPE_B;
}
if(!bgav_bitstream_get(&b, &ret->picture_distance, 8))
return 0;
if(seq->low_delay &&
!bgav_bitstream_get_golomb_ue(&b, &ret->bbv_check_times))
return 0;
if(!bgav_bitstream_get(&b, &ret->progressive_frame, 1))
return 0;
if(!ret->progressive_frame)
{
if(!bgav_bitstream_get(&b, &ret->picture_structure, 1))
return 0;
if(!ret->picture_structure && (sc == FRAME_PB))
{
if(!bgav_bitstream_get(&b, &ret->advanced_pred_mode_disable, 1))
return 0;
}
}
if(!bgav_bitstream_get(&b, &ret->top_field_first, 1) ||
!bgav_bitstream_get(&b, &ret->repeat_first_field, 1))
return 0;
return len - bgav_bitstream_get_bits(&b) / 8;
}
void bgav_cavs_picture_header_dump(const bgav_cavs_picture_header_t * h,
const bgav_cavs_sequence_header_t * seq)
{
gavl_dprintf("CAVS Picture header\n");
gavl_dprintf(" coding_type: %s\n", gavl_coding_type_to_string(h->coding_type));
gavl_dprintf(" bbv_delay: %d\n", h->bbv_delay); /* I/PB, 16 */
if(h->coding_type == GAVL_PACKET_TYPE_I)
{
gavl_dprintf(" time_code_flag: %d\n", h->time_code_flag); /* I, 1 */
if(h->time_code_flag)
{
gavl_dprintf(" time_code: %d\n", h->time_code); /* I, 24 */
}
}
else
{
gavl_dprintf(" picture_coding_type: %d\n", h->picture_coding_type); /* PB, 2 */
}
gavl_dprintf(" picture_distance: %d\n", h->picture_distance); /* I/PB, 8 */
gavl_dprintf(" bbv_check_times: %d\n", h->bbv_check_times); /* I/PB, ue */
gavl_dprintf(" progressive_frame: %d\n", h->progressive_frame); /* I/PB, 1 */
if(!h->progressive_frame)
{
gavl_dprintf(" picture_structure: %d\n", h->picture_structure);
if(h->coding_type != GAVL_PACKET_TYPE_I)
{
gavl_dprintf(" advanced_pred_mode_disable: %d\n", h->advanced_pred_mode_disable );
}
}
gavl_dprintf(" top_field_first: %d\n", h->top_field_first);
gavl_dprintf(" repeat_first_field: %d\n", h->repeat_first_field);
}
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