mirror of
https://github.com/mpv-player/mpv
synced 2024-12-15 11:25:10 +00:00
766e6011ba
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@1623 b3059339-0415-0410-9bf9-f77b7e298cf2
257 lines
7.4 KiB
C
257 lines
7.4 KiB
C
/*
|
|
* slice.c
|
|
* Copyright (C) 1999-2001 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
|
|
*
|
|
* This file is part of mpeg2dec, a free MPEG-2 video stream decoder.
|
|
*
|
|
* mpeg2dec 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.
|
|
*
|
|
* mpeg2dec 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, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#include <inttypes.h>
|
|
|
|
#include "mpeg2_internal.h"
|
|
#include "attributes.h"
|
|
|
|
/* default intra quant matrix, in zig-zag order */
|
|
static uint8_t default_intra_quantizer_matrix[64] ATTR_ALIGN(16) = {
|
|
8,
|
|
16, 16,
|
|
19, 16, 19,
|
|
22, 22, 22, 22,
|
|
22, 22, 26, 24, 26,
|
|
27, 27, 27, 26, 26, 26,
|
|
26, 27, 27, 27, 29, 29, 29,
|
|
34, 34, 34, 29, 29, 29, 27, 27,
|
|
29, 29, 32, 32, 34, 34, 37,
|
|
38, 37, 35, 35, 34, 35,
|
|
38, 38, 40, 40, 40,
|
|
48, 48, 46, 46,
|
|
56, 56, 58,
|
|
69, 69,
|
|
83
|
|
};
|
|
|
|
uint8_t scan_norm[64] ATTR_ALIGN(16) =
|
|
{
|
|
/* Zig-Zag scan pattern */
|
|
0, 1, 8,16, 9, 2, 3,10,
|
|
17,24,32,25,18,11, 4, 5,
|
|
12,19,26,33,40,48,41,34,
|
|
27,20,13, 6, 7,14,21,28,
|
|
35,42,49,56,57,50,43,36,
|
|
29,22,15,23,30,37,44,51,
|
|
58,59,52,45,38,31,39,46,
|
|
53,60,61,54,47,55,62,63
|
|
};
|
|
|
|
uint8_t scan_alt[64] ATTR_ALIGN(16) =
|
|
{
|
|
/* Alternate scan pattern */
|
|
0,8,16,24,1,9,2,10,17,25,32,40,48,56,57,49,
|
|
41,33,26,18,3,11,4,12,19,27,34,42,50,58,35,43,
|
|
51,59,20,28,5,13,6,14,21,29,36,44,52,60,37,45,
|
|
53,61,22,30,7,15,23,31,38,46,54,62,39,47,55,63
|
|
};
|
|
|
|
void header_state_init (picture_t * picture)
|
|
{
|
|
picture->scan = scan_norm;
|
|
}
|
|
|
|
int header_process_sequence_header (picture_t * picture, uint8_t * buffer)
|
|
{
|
|
int width, height;
|
|
int i;
|
|
|
|
if ((buffer[6] & 0x20) != 0x20){
|
|
printf("missing marker bit!\n");
|
|
return 1; /* missing marker_bit */
|
|
}
|
|
|
|
height = (buffer[0] << 16) | (buffer[1] << 8) | buffer[2];
|
|
|
|
picture->display_picture_width = (height >> 12);
|
|
picture->display_picture_height = (height & 0xfff);
|
|
|
|
width = ((height >> 12) + 15) & ~15;
|
|
height = ((height & 0xfff) + 15) & ~15;
|
|
|
|
if ((width > 768) || (height > 576)){
|
|
printf("size restrictions for MP@ML or MPEG1 exceeded! (%dx%d)\n",width,height);
|
|
// return 1; /* size restrictions for MP@ML or MPEG1 */
|
|
}
|
|
|
|
picture->coded_picture_width = width;
|
|
picture->coded_picture_height = height;
|
|
|
|
/* this is not used by the decoder */
|
|
picture->aspect_ratio_information = buffer[3] >> 4;
|
|
picture->frame_rate_code = buffer[3] & 15;
|
|
picture->bitrate = (buffer[4]<<10)|(buffer[5]<<2)|(buffer[6]>>6);
|
|
|
|
if (buffer[7] & 2) {
|
|
for (i = 0; i < 64; i++)
|
|
picture->intra_quantizer_matrix[scan_norm[i]] =
|
|
(buffer[i+7] << 7) | (buffer[i+8] >> 1);
|
|
buffer += 64;
|
|
} else {
|
|
for (i = 0; i < 64; i++)
|
|
picture->intra_quantizer_matrix[scan_norm[i]] =
|
|
default_intra_quantizer_matrix [i];
|
|
}
|
|
|
|
if (buffer[7] & 1) {
|
|
for (i = 0; i < 64; i++)
|
|
picture->non_intra_quantizer_matrix[scan_norm[i]] =
|
|
buffer[i+8];
|
|
} else {
|
|
for (i = 0; i < 64; i++)
|
|
picture->non_intra_quantizer_matrix[i] = 16;
|
|
}
|
|
|
|
/* MPEG1 - for testing only */
|
|
picture->mpeg1 = 1;
|
|
picture->intra_dc_precision = 0;
|
|
picture->frame_pred_frame_dct = 1;
|
|
picture->q_scale_type = 0;
|
|
picture->concealment_motion_vectors = 0;
|
|
/* picture->alternate_scan = 0; */
|
|
picture->picture_structure = FRAME_PICTURE;
|
|
/* picture->second_field = 0; */
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int header_process_sequence_extension (picture_t * picture,
|
|
uint8_t * buffer)
|
|
{
|
|
/* check chroma format, size extensions, marker bit */
|
|
if (((buffer[1] & 0x07) != 0x02) || (buffer[2] & 0xe0) ||
|
|
((buffer[3] & 0x01) != 0x01))
|
|
return 1;
|
|
|
|
/* this is not used by the decoder */
|
|
picture->progressive_sequence = (buffer[1] >> 3) & 1;
|
|
|
|
if (picture->progressive_sequence)
|
|
picture->coded_picture_height =
|
|
(picture->coded_picture_height + 31) & ~31;
|
|
|
|
/* MPEG1 - for testing only */
|
|
picture->mpeg1 = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int header_process_quant_matrix_extension (picture_t * picture,
|
|
uint8_t * buffer)
|
|
{
|
|
int i;
|
|
|
|
if (buffer[0] & 8) {
|
|
for (i = 0; i < 64; i++)
|
|
picture->intra_quantizer_matrix[scan_norm[i]] =
|
|
(buffer[i] << 5) | (buffer[i+1] >> 3);
|
|
buffer += 64;
|
|
}
|
|
|
|
if (buffer[0] & 4) {
|
|
for (i = 0; i < 64; i++)
|
|
picture->non_intra_quantizer_matrix[scan_norm[i]] =
|
|
(buffer[i] << 6) | (buffer[i+1] >> 2);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int header_process_picture_coding_extension (picture_t * picture, uint8_t * buffer)
|
|
{
|
|
/* pre subtract 1 for use later in compute_motion_vector */
|
|
picture->f_motion.f_code[0] = (buffer[0] & 15) - 1;
|
|
picture->f_motion.f_code[1] = (buffer[1] >> 4) - 1;
|
|
picture->b_motion.f_code[0] = (buffer[1] & 15) - 1;
|
|
picture->b_motion.f_code[1] = (buffer[2] >> 4) - 1;
|
|
|
|
picture->intra_dc_precision = (buffer[2] >> 2) & 3;
|
|
picture->picture_structure = buffer[2] & 3;
|
|
picture->frame_pred_frame_dct = (buffer[3] >> 6) & 1;
|
|
picture->concealment_motion_vectors = (buffer[3] >> 5) & 1;
|
|
picture->q_scale_type = (buffer[3] >> 4) & 1;
|
|
picture->intra_vlc_format = (buffer[3] >> 3) & 1;
|
|
|
|
if (buffer[3] & 4) /* alternate_scan */
|
|
picture->scan = scan_alt;
|
|
else
|
|
picture->scan = scan_norm;
|
|
|
|
/* these are not used by the decoder */
|
|
picture->top_field_first = buffer[3] >> 7;
|
|
picture->repeat_first_field = (buffer[3] >> 1) & 1;
|
|
picture->progressive_frame = buffer[4] >> 7;
|
|
|
|
// repeat_first implementation by A'rpi/ESP-team, based on libmpeg3:
|
|
if(picture->repeat_count>=100) picture->repeat_count=0;
|
|
if(picture->repeat_first_field){
|
|
if(picture->progressive_sequence){
|
|
if(picture->top_field_first)
|
|
picture->repeat_count+=200;
|
|
else
|
|
picture->repeat_count+=100;
|
|
} else
|
|
if(picture->progressive_frame){
|
|
picture->repeat_count+=50;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int header_process_extension (picture_t * picture, uint8_t * buffer)
|
|
{
|
|
switch (buffer[0] & 0xf0) {
|
|
case 0x10: /* sequence extension */
|
|
return header_process_sequence_extension (picture, buffer);
|
|
|
|
case 0x30: /* quant matrix extension */
|
|
return header_process_quant_matrix_extension (picture, buffer);
|
|
|
|
case 0x80: /* picture coding extension */
|
|
return header_process_picture_coding_extension (picture, buffer);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int header_process_picture_header (picture_t *picture, uint8_t * buffer)
|
|
{
|
|
picture->picture_coding_type = (buffer [1] >> 3) & 7;
|
|
|
|
/* forward_f_code and backward_f_code - used in mpeg1 only */
|
|
picture->f_motion.f_code[1] = (buffer[3] >> 2) & 1;
|
|
picture->f_motion.f_code[0] =
|
|
(((buffer[3] << 1) | (buffer[4] >> 7)) & 7) - 1;
|
|
picture->b_motion.f_code[1] = (buffer[4] >> 6) & 1;
|
|
picture->b_motion.f_code[0] = ((buffer[4] >> 3) & 7) - 1;
|
|
|
|
/* move in header_process_picture_header */
|
|
picture->second_field =
|
|
(picture->picture_structure != FRAME_PICTURE) &&
|
|
!(picture->second_field);
|
|
|
|
return 0;
|
|
}
|