www.pudn.com > ccs_encoder.rar > bitstream.c
/*****************************************************************************
*
* XVID MPEG-4 VIDEO CODEC
* - Bitstream reader/writer -
*
* Copyright (C) 2001-2003 Peter Ross
* 2003 Cristoph Lampert
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* $Id: bitstream.c,v 1.44 2004/05/31 21:36:23 edgomez Exp $
*
****************************************************************************/
#include "string.h"
#include "stdio.h"
#include "bitstream.h"
#include "zigzag.h"
#include "../quant/quant_matrix.h"
#include "mbcoding.h"
static uint32_t __inline
log2bin(uint32_t value)
{
int n = 0;
while (value) {
value >>= 1;
n++;
}
return n;
}
static const uint32_t intra_dc_threshold_table[] = {
32, /* never use */
13,
15,
17,
19,
21,
23,
1,
};
void
bs_get_matrix(Bitstream * bs,
uint8_t * matrix)
{
int i = 0;
int last, value = 0;
do {
last = value;
value = BitstreamGetBits(bs, 8);
matrix[scan_tables[0][i++]] = value;
}
while (value != 0 && i < 64);
i--; /* fix little bug at coeff not full */
while (i < 64) {
matrix[scan_tables[0][i++]] = last;
}
}
/*
* for PVOP addbits == fcode - 1
* for BVOP addbits == max(fcode,bcode) - 1
* returns mbpos
*/
int
read_video_packet_header(Bitstream *bs,
DECODER * dec,
const int addbits,
int * quant,
int * fcode_forward,
int * fcode_backward,
int * intra_dc_threshold)
{
int startcode_bits = NUMBITS_VP_RESYNC_MARKER + addbits;
int mbnum_bits = log2bin(dec->mb_width * dec->mb_height - 1);
int mbnum;
int hec = 0;
BitstreamSkip(bs, BitstreamNumBitsToByteAlign(bs));
BitstreamSkip(bs, startcode_bits);
DPRINTF(XVID_DEBUG_STARTCODE, "\n");
if (dec->shape != VIDOBJLAY_SHAPE_RECTANGULAR)
{
hec = BitstreamGetBit(bs); /* header_extension_code */
if (hec && !(dec->sprite_enable == SPRITE_STATIC /* && current_coding_type = I_VOP */))
{
BitstreamSkip(bs, 13); /* vop_width */
READ_MARKER();
BitstreamSkip(bs, 13); /* vop_height */
READ_MARKER();
BitstreamSkip(bs, 13); /* vop_horizontal_mc_spatial_ref */
READ_MARKER();
BitstreamSkip(bs, 13); /* vop_vertical_mc_spatial_ref */
READ_MARKER();
}
}
mbnum = BitstreamGetBits(bs, mbnum_bits); /* macroblock_number */
DPRINTF(XVID_DEBUG_HEADER, "mbnum %i\n", mbnum);
if (dec->shape != VIDOBJLAY_SHAPE_BINARY_ONLY)
{
*quant = BitstreamGetBits(bs, dec->quant_bits); /* quant_scale */
DPRINTF(XVID_DEBUG_HEADER, "quant %i\n", *quant);
}
if (dec->shape == VIDOBJLAY_SHAPE_RECTANGULAR)
hec = BitstreamGetBit(bs); /* header_extension_code */
DPRINTF(XVID_DEBUG_HEADER, "header_extension_code %i\n", hec);
if (hec)
{
int time_base;
int time_increment;
int coding_type;
for (time_base=0; BitstreamGetBit(bs)!=0; time_base++); /* modulo_time_base */
READ_MARKER();
if (dec->time_inc_bits)
time_increment = (BitstreamGetBits(bs, dec->time_inc_bits)); /* vop_time_increment */
READ_MARKER();
DPRINTF(XVID_DEBUG_HEADER,"time %i:%i\n", time_base, time_increment);
coding_type = BitstreamGetBits(bs, 2);
DPRINTF(XVID_DEBUG_HEADER,"coding_type %i\n", coding_type);
if (dec->shape != VIDOBJLAY_SHAPE_RECTANGULAR)
{
BitstreamSkip(bs, 1); /* change_conv_ratio_disable */
if (coding_type != I_VOP)
BitstreamSkip(bs, 1); /* vop_shape_coding_type */
}
if (dec->shape != VIDOBJLAY_SHAPE_BINARY_ONLY)
{
*intra_dc_threshold = intra_dc_threshold_table[BitstreamGetBits(bs, 3)];
/* if (dec->sprite_enable == SPRITE_GMC && coding_type == S_VOP &&
dec->sprite_warping_points > 0)
{
/* TODO: sprite trajectory
}*/
if (dec->reduced_resolution_enable &&
dec->shape == VIDOBJLAY_SHAPE_RECTANGULAR &&
(coding_type == P_VOP || coding_type == I_VOP))
{
BitstreamSkip(bs, 1); /* XXX: vop_reduced_resolution */
}
if (coding_type != I_VOP && fcode_forward)
{
*fcode_forward = BitstreamGetBits(bs, 3);
DPRINTF(XVID_DEBUG_HEADER,"fcode_forward %i\n", *fcode_forward);
}
if (coding_type == B_VOP && fcode_backward)
{
*fcode_backward = BitstreamGetBits(bs, 3);
DPRINTF(XVID_DEBUG_HEADER,"fcode_backward %i\n", *fcode_backward);
}
}
}
if (dec->newpred_enable)
{
int vop_id;
int vop_id_for_prediction;
vop_id = BitstreamGetBits(bs, MIN(dec->time_inc_bits + 3, 15));
DPRINTF(XVID_DEBUG_HEADER, "vop_id %i\n", vop_id);
if (BitstreamGetBit(bs)) /* vop_id_for_prediction_indication */
{
vop_id_for_prediction = BitstreamGetBits(bs, MIN(dec->time_inc_bits + 3, 15));
DPRINTF(XVID_DEBUG_HEADER, "vop_id_for_prediction %i\n", vop_id_for_prediction);
}
READ_MARKER();
}
return mbnum;
}
/* vol estimation header */
static void
read_vol_complexity_estimation_header(Bitstream * bs, DECODER * dec)
{
ESTIMATION * e = &dec->estimation;
e->method = BitstreamGetBits(bs, 2); /* estimation_method */
DPRINTF(XVID_DEBUG_HEADER,"+ complexity_estimation_header; method=%i\n", e->method);
if (e->method == 0 || e->method == 1)
{
if (!BitstreamGetBit(bs)) /* shape_complexity_estimation_disable */
{
e->opaque = BitstreamGetBit(bs); /* opaque */
e->transparent = BitstreamGetBit(bs); /* transparent */
e->intra_cae = BitstreamGetBit(bs); /* intra_cae */
e->inter_cae = BitstreamGetBit(bs); /* inter_cae */
e->no_update = BitstreamGetBit(bs); /* no_update */
e->upsampling = BitstreamGetBit(bs); /* upsampling */
}
if (!BitstreamGetBit(bs)) /* texture_complexity_estimation_set_1_disable */
{
e->intra_blocks = BitstreamGetBit(bs); /* intra_blocks */
e->inter_blocks = BitstreamGetBit(bs); /* inter_blocks */
e->inter4v_blocks = BitstreamGetBit(bs); /* inter4v_blocks */
e->not_coded_blocks = BitstreamGetBit(bs); /* not_coded_blocks */
}
}
READ_MARKER();
if (!BitstreamGetBit(bs)) /* texture_complexity_estimation_set_2_disable */
{
e->dct_coefs = BitstreamGetBit(bs); /* dct_coefs */
e->dct_lines = BitstreamGetBit(bs); /* dct_lines */
e->vlc_symbols = BitstreamGetBit(bs); /* vlc_symbols */
e->vlc_bits = BitstreamGetBit(bs); /* vlc_bits */
}
if (!BitstreamGetBit(bs)) /* motion_compensation_complexity_disable */
{
e->apm = BitstreamGetBit(bs); /* apm */
e->npm = BitstreamGetBit(bs); /* npm */
e->interpolate_mc_q = BitstreamGetBit(bs); /* interpolate_mc_q */
e->forw_back_mc_q = BitstreamGetBit(bs); /* forw_back_mc_q */
e->halfpel2 = BitstreamGetBit(bs); /* halfpel2 */
e->halfpel4 = BitstreamGetBit(bs); /* halfpel4 */
}
READ_MARKER();
if (e->method == 1)
{
if (!BitstreamGetBit(bs)) /* version2_complexity_estimation_disable */
{
e->sadct = BitstreamGetBit(bs); /* sadct */
e->quarterpel = BitstreamGetBit(bs); /* quarterpel */
}
}
}
/* vop estimation header */
static void
read_vop_complexity_estimation_header(Bitstream * bs, DECODER * dec, int coding_type)
{
ESTIMATION * e = &dec->estimation;
if (e->method == 0 || e->method == 1)
{
if (coding_type == I_VOP) {
if (e->opaque) BitstreamSkip(bs, 8); /* dcecs_opaque */
if (e->transparent) BitstreamSkip(bs, 8); /* */
if (e->intra_cae) BitstreamSkip(bs, 8); /* */
if (e->inter_cae) BitstreamSkip(bs, 8); /* */
if (e->no_update) BitstreamSkip(bs, 8); /* */
if (e->upsampling) BitstreamSkip(bs, 8); /* */
if (e->intra_blocks) BitstreamSkip(bs, 8); /* */
if (e->not_coded_blocks) BitstreamSkip(bs, 8); /* */
if (e->dct_coefs) BitstreamSkip(bs, 8); /* */
if (e->dct_lines) BitstreamSkip(bs, 8); /* */
if (e->vlc_symbols) BitstreamSkip(bs, 8); /* */
if (e->vlc_bits) BitstreamSkip(bs, 8); /* */
if (e->sadct) BitstreamSkip(bs, 8); /* */
}
if (coding_type == P_VOP) {
if (e->opaque) BitstreamSkip(bs, 8); /* */
if (e->transparent) BitstreamSkip(bs, 8); /* */
if (e->intra_cae) BitstreamSkip(bs, 8); /* */
if (e->inter_cae) BitstreamSkip(bs, 8); /* */
if (e->no_update) BitstreamSkip(bs, 8); /* */
if (e->upsampling) BitstreamSkip(bs, 8); /* */
if (e->intra_blocks) BitstreamSkip(bs, 8); /* */
if (e->not_coded_blocks) BitstreamSkip(bs, 8); /* */
if (e->dct_coefs) BitstreamSkip(bs, 8); /* */
if (e->dct_lines) BitstreamSkip(bs, 8); /* */
if (e->vlc_symbols) BitstreamSkip(bs, 8); /* */
if (e->vlc_bits) BitstreamSkip(bs, 8); /* */
if (e->inter_blocks) BitstreamSkip(bs, 8); /* */
if (e->inter4v_blocks) BitstreamSkip(bs, 8); /* */
if (e->apm) BitstreamSkip(bs, 8); /* */
if (e->npm) BitstreamSkip(bs, 8); /* */
if (e->forw_back_mc_q) BitstreamSkip(bs, 8); /* */
if (e->halfpel2) BitstreamSkip(bs, 8); /* */
if (e->halfpel4) BitstreamSkip(bs, 8); /* */
if (e->sadct) BitstreamSkip(bs, 8); /* */
if (e->quarterpel) BitstreamSkip(bs, 8); /* */
}
if (coding_type == B_VOP) {
if (e->opaque) BitstreamSkip(bs, 8); /* */
if (e->transparent) BitstreamSkip(bs, 8); /* */
if (e->intra_cae) BitstreamSkip(bs, 8); /* */
if (e->inter_cae) BitstreamSkip(bs, 8); /* */
if (e->no_update) BitstreamSkip(bs, 8); /* */
if (e->upsampling) BitstreamSkip(bs, 8); /* */
if (e->intra_blocks) BitstreamSkip(bs, 8); /* */
if (e->not_coded_blocks) BitstreamSkip(bs, 8); /* */
if (e->dct_coefs) BitstreamSkip(bs, 8); /* */
if (e->dct_lines) BitstreamSkip(bs, 8); /* */
if (e->vlc_symbols) BitstreamSkip(bs, 8); /* */
if (e->vlc_bits) BitstreamSkip(bs, 8); /* */
if (e->inter_blocks) BitstreamSkip(bs, 8); /* */
if (e->inter4v_blocks) BitstreamSkip(bs, 8); /* */
if (e->apm) BitstreamSkip(bs, 8); /* */
if (e->npm) BitstreamSkip(bs, 8); /* */
if (e->forw_back_mc_q) BitstreamSkip(bs, 8); /* */
if (e->halfpel2) BitstreamSkip(bs, 8); /* */
if (e->halfpel4) BitstreamSkip(bs, 8); /* */
if (e->interpolate_mc_q) BitstreamSkip(bs, 8); /* */
if (e->sadct) BitstreamSkip(bs, 8); /* */
if (e->quarterpel) BitstreamSkip(bs, 8); /* */
}
if (coding_type == S_VOP && dec->sprite_enable == SPRITE_STATIC) {
if (e->intra_blocks) BitstreamSkip(bs, 8); /* */
if (e->not_coded_blocks) BitstreamSkip(bs, 8); /* */
if (e->dct_coefs) BitstreamSkip(bs, 8); /* */
if (e->dct_lines) BitstreamSkip(bs, 8); /* */
if (e->vlc_symbols) BitstreamSkip(bs, 8); /* */
if (e->vlc_bits) BitstreamSkip(bs, 8); /* */
if (e->inter_blocks) BitstreamSkip(bs, 8); /* */
if (e->inter4v_blocks) BitstreamSkip(bs, 8); /* */
if (e->apm) BitstreamSkip(bs, 8); /* */
if (e->npm) BitstreamSkip(bs, 8); /* */
if (e->forw_back_mc_q) BitstreamSkip(bs, 8); /* */
if (e->halfpel2) BitstreamSkip(bs, 8); /* */
if (e->halfpel4) BitstreamSkip(bs, 8); /* */
if (e->interpolate_mc_q) BitstreamSkip(bs, 8); /* */
}
}
}
/*
decode headers
returns coding_type, or -1 if error
*/
#define VIDOBJ_START_CODE_MASK 0x0000001f
#define VIDOBJLAY_START_CODE_MASK 0x0000000f
int
BitstreamReadHeaders(Bitstream * bs,
DECODER * dec,
uint32_t * rounding,
uint32_t * reduced_resolution,
uint32_t * quant,
uint32_t * fcode_forward,
uint32_t * fcode_backward,
uint32_t * intra_dc_threshold,
WARPPOINTS *gmc_warp)
{
uint32_t vol_ver_id;
uint32_t coding_type;
uint32_t start_code;
uint32_t time_incr = 0;
int32_t time_increment = 0;
int resize = 0;
do {
BitstreamByteAlign(bs);
start_code = BitstreamShowBits(bs, 32);
if (start_code == VISOBJSEQ_START_CODE) {
int profile;
DPRINTF(XVID_DEBUG_STARTCODE, "\n");
BitstreamSkip(bs, 32); /* visual_object_sequence_start_code */
profile = BitstreamGetBits(bs, 8); /* profile_and_level_indication */
DPRINTF(XVID_DEBUG_HEADER, "profile_and_level_indication %i\n", profile);
} else if (start_code == VISOBJSEQ_STOP_CODE) {
BitstreamSkip(bs, 32); /* visual_object_sequence_stop_code */
DPRINTF(XVID_DEBUG_STARTCODE, "\n");
} else if (start_code == VISOBJ_START_CODE) {
int visobj_ver_id;
DPRINTF(XVID_DEBUG_STARTCODE, "\n");
BitstreamSkip(bs, 32); /* visual_object_start_code */
if (BitstreamGetBit(bs)) /* is_visual_object_identified */
{
visobj_ver_id = BitstreamGetBits(bs, 4); /* visual_object_ver_id */
DPRINTF(XVID_DEBUG_HEADER,"visobj_ver_id %i\n", visobj_ver_id);
BitstreamSkip(bs, 3); /* visual_object_priority */
} else {
visobj_ver_id = 1;
}
if (BitstreamShowBits(bs, 4) != VISOBJ_TYPE_VIDEO) /* visual_object_type */
{
DPRINTF(XVID_DEBUG_ERROR, "visual_object_type != video\n");
return -1;
}
BitstreamSkip(bs, 4);
/* video_signal_type */
if (BitstreamGetBit(bs)) /* video_signal_type */
{
DPRINTF(XVID_DEBUG_HEADER,"+ video_signal_type\n");
BitstreamSkip(bs, 3); /* video_format */
BitstreamSkip(bs, 1); /* video_range */
if (BitstreamGetBit(bs)) /* color_description */
{
DPRINTF(XVID_DEBUG_HEADER,"+ color_description");
BitstreamSkip(bs, 8); /* color_primaries */
BitstreamSkip(bs, 8); /* transfer_characteristics */
BitstreamSkip(bs, 8); /* matrix_coefficients */
}
}
} else if ((start_code & ~VIDOBJ_START_CODE_MASK) == VIDOBJ_START_CODE) {
DPRINTF(XVID_DEBUG_STARTCODE, "\n");
DPRINTF(XVID_DEBUG_HEADER, "vo id %i\n", start_code & VIDOBJ_START_CODE_MASK);
BitstreamSkip(bs, 32); /* video_object_start_code */
} else if ((start_code & ~VIDOBJLAY_START_CODE_MASK) == VIDOBJLAY_START_CODE) {
DPRINTF(XVID_DEBUG_STARTCODE, "\n");
DPRINTF(XVID_DEBUG_HEADER, "vol id %i\n", start_code & VIDOBJLAY_START_CODE_MASK);
BitstreamSkip(bs, 32); /* video_object_layer_start_code */
BitstreamSkip(bs, 1); /* random_accessible_vol */
BitstreamSkip(bs, 8); /* video_object_type_indication */
if (BitstreamGetBit(bs)) /* is_object_layer_identifier */
{
DPRINTF(XVID_DEBUG_HEADER, "+ is_object_layer_identifier\n");
vol_ver_id = BitstreamGetBits(bs, 4); /* video_object_layer_verid */
DPRINTF(XVID_DEBUG_HEADER,"ver_id %i\n", vol_ver_id);
BitstreamSkip(bs, 3); /* video_object_layer_priority */
} else {
vol_ver_id = 1;
}
dec->aspect_ratio = BitstreamGetBits(bs, 4);
if (dec->aspect_ratio == VIDOBJLAY_AR_EXTPAR) /* aspect_ratio_info */
{
DPRINTF(XVID_DEBUG_HEADER, "+ aspect_ratio_info\n");
dec->par_width = BitstreamGetBits(bs, 8); /* par_width */
dec->par_height = BitstreamGetBits(bs, 8); /* par_height */
}
if (BitstreamGetBit(bs)) /* vol_control_parameters */
{
DPRINTF(XVID_DEBUG_HEADER, "+ vol_control_parameters\n");
BitstreamSkip(bs, 2); /* chroma_format */
dec->low_delay = BitstreamGetBit(bs); /* low_delay */
DPRINTF(XVID_DEBUG_HEADER, "low_delay %i\n", dec->low_delay);
if (BitstreamGetBit(bs)) /* vbv_parameters */
{
unsigned int bitrate;
unsigned int buffer_size;
unsigned int occupancy;
DPRINTF(XVID_DEBUG_HEADER,"+ vbv_parameters\n");
bitrate = BitstreamGetBits(bs,15) << 15; /* first_half_bit_rate */
READ_MARKER();
bitrate |= BitstreamGetBits(bs,15); /* latter_half_bit_rate */
READ_MARKER();
buffer_size = BitstreamGetBits(bs, 15) << 3; /* first_half_vbv_buffer_size */
READ_MARKER();
buffer_size |= BitstreamGetBits(bs, 3); /* latter_half_vbv_buffer_size */
occupancy = BitstreamGetBits(bs, 11) << 15; /* first_half_vbv_occupancy */
READ_MARKER();
occupancy |= BitstreamGetBits(bs, 15); /* latter_half_vbv_occupancy */
READ_MARKER();
DPRINTF(XVID_DEBUG_HEADER,"bitrate %d (unit=400 bps)\n", bitrate);
DPRINTF(XVID_DEBUG_HEADER,"buffer_size %d (unit=16384 bits)\n", buffer_size);
DPRINTF(XVID_DEBUG_HEADER,"occupancy %d (unit=64 bits)\n", occupancy);
}
}else{
dec->low_delay = dec->low_delay_default;
}
dec->shape = BitstreamGetBits(bs, 2); /* video_object_layer_shape */
DPRINTF(XVID_DEBUG_HEADER, "shape %i\n", dec->shape);
if (dec->shape != VIDOBJLAY_SHAPE_RECTANGULAR)
{
DPRINTF(XVID_DEBUG_ERROR,"non-rectangular shapes are not supported\n");
}
if (dec->shape == VIDOBJLAY_SHAPE_GRAYSCALE && vol_ver_id != 1) {
BitstreamSkip(bs, 4); /* video_object_layer_shape_extension */
}
READ_MARKER();
/********************** for decode B-frame time ***********************/
dec->time_inc_resolution = BitstreamGetBits(bs, 16); /* vop_time_increment_resolution */
DPRINTF(XVID_DEBUG_HEADER,"vop_time_increment_resolution %i\n", dec->time_inc_resolution);
#if 0
dec->time_inc_resolution--;
#endif
if (dec->time_inc_resolution > 0) {
dec->time_inc_bits = MAX(log2bin(dec->time_inc_resolution-1), 1);
} else {
#if 0
dec->time_inc_bits = 0;
#endif
/* for "old" xvid compatibility, set time_inc_bits = 1 */
dec->time_inc_bits = 1;
}
READ_MARKER();
if (BitstreamGetBit(bs)) /* fixed_vop_rate */
{
DPRINTF(XVID_DEBUG_HEADER, "+ fixed_vop_rate\n");
BitstreamSkip(bs, dec->time_inc_bits); /* fixed_vop_time_increment */
}
if (dec->shape != VIDOBJLAY_SHAPE_BINARY_ONLY) {
if (dec->shape == VIDOBJLAY_SHAPE_RECTANGULAR) {
uint32_t width, height;
READ_MARKER();
width = BitstreamGetBits(bs, 13); /* video_object_layer_width */
READ_MARKER();
height = BitstreamGetBits(bs, 13); /* video_object_layer_height */
READ_MARKER();
DPRINTF(XVID_DEBUG_HEADER, "width %i\n", width);
DPRINTF(XVID_DEBUG_HEADER, "height %i\n", height);
if (dec->width != width || dec->height != height)
{
if (dec->fixed_dimensions)
{
DPRINTF(XVID_DEBUG_ERROR, "decoder width/height does not match bitstream\n");
return -1;
}
resize = 1;
dec->width = width;
dec->height = height;
}
}
dec->interlacing = BitstreamGetBit(bs);
DPRINTF(XVID_DEBUG_HEADER, "interlacing %i\n", dec->interlacing);
if (!BitstreamGetBit(bs)) /* obmc_disable */
{
DPRINTF(XVID_DEBUG_ERROR, "obmc_disabled==false not supported\n");
/* TODO */
/* fucking divx4.02 has this enabled */
}
/* dec->sprite_enable = BitstreamGetBits(bs, (vol_ver_id == 1 ? 1 : 2)); /* sprite_enable
if (dec->sprite_enable == SPRITE_STATIC || dec->sprite_enable == SPRITE_GMC)
{
int low_latency_sprite_enable;
if (dec->sprite_enable != SPRITE_GMC)
{
int sprite_width;
int sprite_height;
int sprite_left_coord;
int sprite_top_coord;
sprite_width = BitstreamGetBits(bs, 13); /* sprite_width
READ_MARKER();
sprite_height = BitstreamGetBits(bs, 13); /* sprite_height
READ_MARKER();
sprite_left_coord = BitstreamGetBits(bs, 13); /* sprite_left_coordinate
READ_MARKER();
sprite_top_coord = BitstreamGetBits(bs, 13); /* sprite_top_coordinate
READ_MARKER();
}
dec->sprite_warping_points = BitstreamGetBits(bs, 6); /* no_of_sprite_warping_points
dec->sprite_warping_accuracy = BitstreamGetBits(bs, 2); /* sprite_warping_accuracy
dec->sprite_brightness_change = BitstreamGetBits(bs, 1); /* brightness_change
if (dec->sprite_enable != SPRITE_GMC)
{
low_latency_sprite_enable = BitstreamGetBits(bs, 1); /* low_latency_sprite_enable
}
}*/
if (vol_ver_id != 1 &&
dec->shape != VIDOBJLAY_SHAPE_RECTANGULAR) {
BitstreamSkip(bs, 1); /* sadct_disable */
}
if (BitstreamGetBit(bs)) /* not_8_bit */
{
DPRINTF(XVID_DEBUG_HEADER, "not_8_bit==true (ignored)\n");
dec->quant_bits = BitstreamGetBits(bs, 4); /* quant_precision */
BitstreamSkip(bs, 4); /* bits_per_pixel */
} else {
dec->quant_bits = 5;
}
if (dec->shape == VIDOBJLAY_SHAPE_GRAYSCALE) {
BitstreamSkip(bs, 1); /* no_gray_quant_update */
BitstreamSkip(bs, 1); /* composition_method */
BitstreamSkip(bs, 1); /* linear_composition */
}
dec->quant_type = BitstreamGetBit(bs); /* quant_type */
DPRINTF(XVID_DEBUG_HEADER, "quant_type %i\n", dec->quant_type);
if (dec->quant_type) {
if (BitstreamGetBit(bs)) /* load_intra_quant_mat */
{
uint8_t matrix[64];
DPRINTF(XVID_DEBUG_HEADER, "load_intra_quant_mat\n");
bs_get_matrix(bs, matrix);
set_intra_matrix(dec->mpeg_quant_matrices, matrix);
} else
set_intra_matrix(dec->mpeg_quant_matrices, get_default_intra_matrix());
if (BitstreamGetBit(bs)) /* load_inter_quant_mat */
{
uint8_t matrix[64];
DPRINTF(XVID_DEBUG_HEADER, "load_inter_quant_mat\n");
bs_get_matrix(bs, matrix);
set_inter_matrix(dec->mpeg_quant_matrices, matrix);
} else
set_inter_matrix(dec->mpeg_quant_matrices, get_default_inter_matrix());
if (dec->shape == VIDOBJLAY_SHAPE_GRAYSCALE) {
DPRINTF(XVID_DEBUG_ERROR, "greyscale matrix not supported\n");
return -1;
}
}
if (vol_ver_id != 1) {
dec->quarterpel = BitstreamGetBit(bs); /* quarter_sample */
DPRINTF(XVID_DEBUG_HEADER,"quarterpel %i\n", dec->quarterpel);
}
else
dec->quarterpel = 0;
dec->complexity_estimation_disable = BitstreamGetBit(bs); /* complexity estimation disable */
if (!dec->complexity_estimation_disable)
{
read_vol_complexity_estimation_header(bs, dec);
}
BitstreamSkip(bs, 1); /* resync_marker_disable */
if (BitstreamGetBit(bs)) /* data_partitioned */
{
DPRINTF(XVID_DEBUG_ERROR, "data_partitioned not supported\n");
BitstreamSkip(bs, 1); /* reversible_vlc */
}
if (vol_ver_id != 1) {
dec->newpred_enable = BitstreamGetBit(bs);
if (dec->newpred_enable) /* newpred_enable */
{
DPRINTF(XVID_DEBUG_HEADER, "+ newpred_enable\n");
BitstreamSkip(bs, 2); /* requested_upstream_message_type */
BitstreamSkip(bs, 1); /* newpred_segment_type */
}
dec->reduced_resolution_enable = BitstreamGetBit(bs); /* reduced_resolution_vop_enable */
DPRINTF(XVID_DEBUG_HEADER, "reduced_resolution_enable %i\n", dec->reduced_resolution_enable);
}
else
{
dec->newpred_enable = 0;
dec->reduced_resolution_enable = 0;
}
dec->scalability = BitstreamGetBit(bs); /* scalability */
if (dec->scalability)
{
DPRINTF(XVID_DEBUG_ERROR, "scalability not supported\n");
BitstreamSkip(bs, 1); /* hierarchy_type */
BitstreamSkip(bs, 4); /* ref_layer_id */
BitstreamSkip(bs, 1); /* ref_layer_sampling_direc */
BitstreamSkip(bs, 5); /* hor_sampling_factor_n */
BitstreamSkip(bs, 5); /* hor_sampling_factor_m */
BitstreamSkip(bs, 5); /* vert_sampling_factor_n */
BitstreamSkip(bs, 5); /* vert_sampling_factor_m */
BitstreamSkip(bs, 1); /* enhancement_type */
if(dec->shape == VIDOBJLAY_SHAPE_BINARY /* && hierarchy_type==0 */) {
BitstreamSkip(bs, 1); /* use_ref_shape */
BitstreamSkip(bs, 1); /* use_ref_texture */
BitstreamSkip(bs, 5); /* shape_hor_sampling_factor_n */
BitstreamSkip(bs, 5); /* shape_hor_sampling_factor_m */
BitstreamSkip(bs, 5); /* shape_vert_sampling_factor_n */
BitstreamSkip(bs, 5); /* shape_vert_sampling_factor_m */
}
return -1;
}
} else /* dec->shape == BINARY_ONLY */
{
if (vol_ver_id != 1) {
dec->scalability = BitstreamGetBit(bs); /* scalability */
if (dec->scalability)
{
DPRINTF(XVID_DEBUG_ERROR, "scalability not supported\n");
BitstreamSkip(bs, 4); /* ref_layer_id */
BitstreamSkip(bs, 5); /* hor_sampling_factor_n */
BitstreamSkip(bs, 5); /* hor_sampling_factor_m */
BitstreamSkip(bs, 5); /* vert_sampling_factor_n */
BitstreamSkip(bs, 5); /* vert_sampling_factor_m */
return -1;
}
}
BitstreamSkip(bs, 1); /* resync_marker_disable */
}
return (resize ? -3 : -2 ); /* VOL */
} else if (start_code == GRPOFVOP_START_CODE) {
DPRINTF(XVID_DEBUG_STARTCODE, "\n");
BitstreamSkip(bs, 32);
{
int hours, minutes, seconds;
hours = BitstreamGetBits(bs, 5);
minutes = BitstreamGetBits(bs, 6);
READ_MARKER();
seconds = BitstreamGetBits(bs, 6);
DPRINTF(XVID_DEBUG_HEADER, "time %ih%im%is\n", hours,minutes,seconds);
}
BitstreamSkip(bs, 1); /* closed_gov */
BitstreamSkip(bs, 1); /* broken_link */
} else if (start_code == VOP_START_CODE) {
DPRINTF(XVID_DEBUG_STARTCODE, "\n");
BitstreamSkip(bs, 32); /* vop_start_code */
coding_type = BitstreamGetBits(bs, 2); /* vop_coding_type */
DPRINTF(XVID_DEBUG_HEADER, "coding_type %i\n", coding_type);
/*********************** for decode B-frame time ***********************/
while (BitstreamGetBit(bs) != 0) /* time_base */
time_incr++;
READ_MARKER();
if (dec->time_inc_bits) {
time_increment = (BitstreamGetBits(bs, dec->time_inc_bits)); /* vop_time_increment */
}
DPRINTF(XVID_DEBUG_HEADER, "time_base %i\n", time_incr);
DPRINTF(XVID_DEBUG_HEADER, "time_increment %i\n", time_increment);
DPRINTF(XVID_DEBUG_TIMECODE, "%c %i:%i\n",
coding_type == I_VOP ? 'I' : coding_type == P_VOP ? 'P' : coding_type == B_VOP ? 'B' : 'S',
time_incr, time_increment);
if (coding_type != B_VOP) {
dec->last_time_base = dec->time_base;
dec->time_base += time_incr;
dec->time = dec->time_base*dec->time_inc_resolution + time_increment;
dec->time_pp = (int32_t)(dec->time - dec->last_non_b_time);
dec->last_non_b_time = dec->time;
} else {
dec->time = (dec->last_time_base + time_incr)*dec->time_inc_resolution + time_increment;
dec->time_bp = dec->time_pp - (int32_t)(dec->last_non_b_time - dec->time);
}
DPRINTF(XVID_DEBUG_HEADER,"time_pp=%i\n", dec->time_pp);
DPRINTF(XVID_DEBUG_HEADER,"time_bp=%i\n", dec->time_bp);
READ_MARKER();
if (!BitstreamGetBit(bs)) /* vop_coded */
{
DPRINTF(XVID_DEBUG_HEADER, "vop_coded==false\n");
return N_VOP;
}
if (dec->newpred_enable)
{
int vop_id;
int vop_id_for_prediction;
vop_id = BitstreamGetBits(bs, MIN(dec->time_inc_bits + 3, 15));
DPRINTF(XVID_DEBUG_HEADER, "vop_id %i\n", vop_id);
if (BitstreamGetBit(bs)) /* vop_id_for_prediction_indication */
{
vop_id_for_prediction = BitstreamGetBits(bs, MIN(dec->time_inc_bits + 3, 15));
DPRINTF(XVID_DEBUG_HEADER, "vop_id_for_prediction %i\n", vop_id_for_prediction);
}
READ_MARKER();
}
/* fix a little bug by MinChen */
if ((dec->shape != VIDOBJLAY_SHAPE_BINARY_ONLY) &&
( (coding_type == P_VOP) || (coding_type == S_VOP && dec->sprite_enable == SPRITE_GMC) ) ) {
*rounding = BitstreamGetBit(bs); /* rounding_type */
DPRINTF(XVID_DEBUG_HEADER, "rounding %i\n", *rounding);
}
if (dec->reduced_resolution_enable &&
dec->shape == VIDOBJLAY_SHAPE_RECTANGULAR &&
(coding_type == P_VOP || coding_type == I_VOP)) {
*reduced_resolution = BitstreamGetBit(bs);
DPRINTF(XVID_DEBUG_HEADER, "reduced_resolution %i\n", *reduced_resolution);
}
else
{
*reduced_resolution = 0;
}
if (dec->shape != VIDOBJLAY_SHAPE_RECTANGULAR) {
if(!(dec->sprite_enable == SPRITE_STATIC && coding_type == I_VOP)) {
uint32_t width, height;
uint32_t horiz_mc_ref, vert_mc_ref;
width = BitstreamGetBits(bs, 13);
READ_MARKER();
height = BitstreamGetBits(bs, 13);
READ_MARKER();
horiz_mc_ref = BitstreamGetBits(bs, 13);
READ_MARKER();
vert_mc_ref = BitstreamGetBits(bs, 13);
READ_MARKER();
DPRINTF(XVID_DEBUG_HEADER, "width %i\n", width);
DPRINTF(XVID_DEBUG_HEADER, "height %i\n", height);
DPRINTF(XVID_DEBUG_HEADER, "horiz_mc_ref %i\n", horiz_mc_ref);
DPRINTF(XVID_DEBUG_HEADER, "vert_mc_ref %i\n", vert_mc_ref);
}
BitstreamSkip(bs, 1); /* change_conv_ratio_disable */
if (BitstreamGetBit(bs)) /* vop_constant_alpha */
{
BitstreamSkip(bs, 8); /* vop_constant_alpha_value */
}
}
if (dec->shape != VIDOBJLAY_SHAPE_BINARY_ONLY) {
if (!dec->complexity_estimation_disable)
{
read_vop_complexity_estimation_header(bs, dec, coding_type);
}
/* intra_dc_vlc_threshold */
*intra_dc_threshold =
intra_dc_threshold_table[BitstreamGetBits(bs, 3)];
dec->top_field_first = 0;
dec->alternate_vertical_scan = 0;
if (dec->interlacing) {
dec->top_field_first = BitstreamGetBit(bs);
DPRINTF(XVID_DEBUG_HEADER, "interlace top_field_first %i\n", dec->top_field_first);
dec->alternate_vertical_scan = BitstreamGetBit(bs);
DPRINTF(XVID_DEBUG_HEADER, "interlace alternate_vertical_scan %i\n", dec->alternate_vertical_scan);
}
}
/* if ((dec->sprite_enable == SPRITE_STATIC || dec->sprite_enable== SPRITE_GMC) && coding_type == S_VOP) {
int i;
for (i = 0 ; i < dec->sprite_warping_points; i++)
{
int length;
int x = 0, y = 0;
/* sprite code borowed from ffmpeg; thx Michael Niedermayer
length = bs_get_spritetrajectory(bs);
if(length){
x= BitstreamGetBits(bs, length);
if ((x >> (length - 1)) == 0) /* if MSB not set it is negative
x = - (x ^ ((1 << length) - 1));
}
READ_MARKER();
length = bs_get_spritetrajectory(bs);
if(length){
y = BitstreamGetBits(bs, length);
if ((y >> (length - 1)) == 0) /* if MSB not set it is negative
y = - (y ^ ((1 << length) - 1));
}
READ_MARKER();
gmc_warp->duv[i].x = x;
gmc_warp->duv[i].y = y;
DPRINTF(XVID_DEBUG_HEADER,"sprite_warping_point[%i] xy=(%i,%i)\n", i, x, y);
}
if (dec->sprite_brightness_change)
{
/* XXX: brightness_change_factor()
}
if (dec->sprite_enable == SPRITE_STATIC)
{
/* XXX: todo
}
}*/
if ((*quant = BitstreamGetBits(bs, dec->quant_bits)) < 1) /* vop_quant */
*quant = 1;
DPRINTF(XVID_DEBUG_HEADER, "quant %i\n", *quant);
if (coding_type != I_VOP) {
*fcode_forward = BitstreamGetBits(bs, 3); /* fcode_forward */
DPRINTF(XVID_DEBUG_HEADER, "fcode_forward %i\n", *fcode_forward);
}
if (coding_type == B_VOP) {
*fcode_backward = BitstreamGetBits(bs, 3); /* fcode_backward */
DPRINTF(XVID_DEBUG_HEADER, "fcode_backward %i\n", *fcode_backward);
}
if (!dec->scalability) {
if ((dec->shape != VIDOBJLAY_SHAPE_RECTANGULAR) &&
(coding_type != I_VOP)) {
BitstreamSkip(bs, 1); /* vop_shape_coding_type */
}
}
return coding_type;
} else if (start_code == USERDATA_START_CODE) {
char tmp[256];
int i, version, build;
char packed;
BitstreamSkip(bs, 32); /* user_data_start_code */
tmp[0] = BitstreamShowBits(bs, 8);
for(i = 1; i < 256; i++){
tmp[i] = (BitstreamShowBits(bs, 16) & 0xFF);
if(tmp[i] == 0)
break;
BitstreamSkip(bs, 8);
}
DPRINTF(XVID_DEBUG_STARTCODE, ": %s\n", tmp);
/* read xvid bitstream version */
if(strncmp(tmp, "XviD", 4) == 0) {
if (tmp[strlen(tmp)-1] == 'C') {
sscanf(tmp, "XviD%dC", &dec->bs_version);
dec->cartoon_mode = 1;
}
else
sscanf(tmp, "XviD%d", &dec->bs_version);
DPRINTF(XVID_DEBUG_HEADER, "xvid bitstream version=%i\n", dec->bs_version);
}
/* divx detection */
i = sscanf(tmp, "DivX%dBuild%d%c", &version, &build, &packed);
if (i < 2)
i = sscanf(tmp, "DivX%db%d%c", &version, &build, &packed);
if (i >= 2)
{
dec->packed_mode = (i == 3 && packed == 'p');
DPRINTF(XVID_DEBUG_HEADER, "divx version=%i, build=%i packed=%i\n",
version, build, dec->packed_mode);
}
} else /* start_code == ? */
{
if (BitstreamShowBits(bs, 24) == 0x000001) {
DPRINTF(XVID_DEBUG_STARTCODE, "\n", BitstreamShowBits(bs, 32));
}
BitstreamSkip(bs, 8);
}
}
while ((BitstreamPos(bs) >> 3) < bs->length);
#if 0
DPRINTF("*** WARNING: no vop_start_code found");
#endif
return -1; /* ignore it */
}
/* write custom quant matrix */
static void
bs_put_matrix(Bitstream * bs,
const uint16_t * matrix)
{
int i, j;
const int last = matrix[scan_tables[0][63]];
for (j = 63; j > 0 && matrix[scan_tables[0][j - 1]] == last; j--);
for (i = 0; i <= j; i++) {
BitstreamPutBits(bs, matrix[scan_tables[0][i]], 8);
}
if (j < 63) {
BitstreamPutBits(bs, 0, 8);
}
}
/*
write vol header
*/
void
BitstreamWriteVolHeader(Bitstream * const bs,
const MBParam * pParam,
const FRAMEINFO * const frame)
{
static const unsigned int vo_id = 0;
static const unsigned int vol_id = 0;
int vol_ver_id = 1;
int vol_type_ind = VIDOBJLAY_TYPE_SIMPLE;
int vol_profile = pParam->profile;
if ( (pParam->vol_flags & XVID_VOL_QUARTERPEL) ||
// (pParam->vol_flags & XVID_VOL_GMC) ||
(pParam->vol_flags & XVID_VOL_REDUCED_ENABLE))
vol_ver_id = 2;
if ((pParam->vol_flags & XVID_VOL_REDUCED_ENABLE)) {
vol_type_ind = VIDOBJLAY_TYPE_ART_SIMPLE;
}
if (pParam->vol_flags & XVID_VOL_QUARTERPEL)
// (pParam->vol_flags & XVID_VOL_GMC))
{
vol_type_ind = VIDOBJLAY_TYPE_ASP;
}
/* visual_object_sequence_start_code */
#if 0
BitstreamPad(bs);
#endif
/*
* no padding here, anymore. You have to make sure that you are
* byte aligned, and that always 1-8 padding bits have been written
*/
if (!vol_profile) {
/* Profile was not set by client app, use the more permissive profile
* compatible with the vol_type_id */
switch(vol_type_ind) {
case VIDOBJLAY_TYPE_ASP:
vol_profile = 0xf5; /* ASP level 5 */
break;
case VIDOBJLAY_TYPE_ART_SIMPLE:
vol_profile = 0x94; /* ARTS level 4 */
break;
default:
vol_profile = 0x03; /* Simple level 3 */
break;
}
}
/* Write the VOS header */
BitstreamPutBits(bs, VISOBJSEQ_START_CODE, 32);
BitstreamPutBits(bs, vol_profile, 8); /* profile_and_level_indication */
/* visual_object_start_code */
BitstreamPad(bs);
BitstreamPutBits(bs, VISOBJ_START_CODE, 32);
BitstreamPutBits(bs, 0, 1); /* is_visual_object_identifier */
/* Video type */
BitstreamPutBits(bs, VISOBJ_TYPE_VIDEO, 4); /* visual_object_type */
BitstreamPutBit(bs, 0); /* video_signal_type */
/* video object_start_code & vo_id */
BitstreamPadAlways(bs); /* next_start_code() */
BitstreamPutBits(bs, VIDOBJ_START_CODE|(vo_id&0x5), 32);
/* video_object_layer_start_code & vol_id */
BitstreamPad(bs);
BitstreamPutBits(bs, VIDOBJLAY_START_CODE|(vol_id&0x4), 32);
BitstreamPutBit(bs, 0); /* random_accessible_vol */
BitstreamPutBits(bs, vol_type_ind, 8); /* video_object_type_indication */
if (vol_ver_id == 1) {
BitstreamPutBit(bs, 0); /* is_object_layer_identified (0=not given) */
} else {
BitstreamPutBit(bs, 1); /* is_object_layer_identified */
BitstreamPutBits(bs, vol_ver_id, 4); /* vol_ver_id == 2 */
BitstreamPutBits(bs, 4, 3); /* vol_ver_priority (1==highest, 7==lowest) */
}
/* Aspect ratio */
BitstreamPutBits(bs, pParam->par, 4); /* aspect_ratio_info (1=1:1) */
if(pParam->par == XVID_PAR_EXT) {
BitstreamPutBits(bs, pParam->par_width, 8);
BitstreamPutBits(bs, pParam->par_height, 8);
}
BitstreamPutBit(bs, 1); /* vol_control_parameters */
BitstreamPutBits(bs, 1, 2); /* chroma_format 1="4:2:0" */
if (pParam->max_bframes > 0) {
BitstreamPutBit(bs, 0); /* low_delay */
} else
{
BitstreamPutBit(bs, 1); /* low_delay */
}
BitstreamPutBit(bs, 0); /* vbv_parameters (0=not given) */
BitstreamPutBits(bs, 0, 2); /* video_object_layer_shape (0=rectangular) */
WRITE_MARKER();
/*
* time_inc_resolution; ignored by current decore versions
* eg. 2fps res=2 inc=1
* 25fps res=25 inc=1
* 29.97fps res=30000 inc=1001
*/
BitstreamPutBits(bs, pParam->fbase, 16);
WRITE_MARKER();
if (pParam->fincr>0) {
BitstreamPutBit(bs, 1); /* fixed_vop_rate = 1 */
BitstreamPutBits(bs, pParam->fincr, MAX(log2bin(pParam->fbase-1),1)); /* fixed_vop_time_increment */
}else{
BitstreamPutBit(bs, 0); /* fixed_vop_rate = 0 */
}
WRITE_MARKER();
BitstreamPutBits(bs, pParam->width, 13); /* width */
WRITE_MARKER();
BitstreamPutBits(bs, pParam->height, 13); /* height */
WRITE_MARKER();
BitstreamPutBit(bs, pParam->vol_flags & XVID_VOL_INTERLACING); /* interlace */
BitstreamPutBit(bs, 1); /* obmc_disable (overlapped block motion compensation) */
if (vol_ver_id != 1)
{ if ((pParam->vol_flags
// & XVID_VOL_GMC
))
{ BitstreamPutBits(bs, 2, 2); /* sprite_enable=='GMC' */
BitstreamPutBits(bs, 3, 6); /* no_of_sprite_warping_points */
BitstreamPutBits(bs, 3, 2); /* sprite_warping_accuracy 0==1/2, 1=1/4, 2=1/8, 3=1/16 */
BitstreamPutBit(bs, 0); /* sprite_brightness_change (not supported) */
/*
* currently we use no_of_sprite_warping_points==2, sprite_warping_accuracy==3
* for DivX5 compatability
*/
} else
BitstreamPutBits(bs, 0, 2); /* sprite_enable==off */
}
else
BitstreamPutBit(bs, 0); /* sprite_enable==off */
BitstreamPutBit(bs, 0); /* not_8_bit */
/* quant_type 0=h.263 1=mpeg4(quantizer tables) */
BitstreamPutBit(bs, pParam->vol_flags & XVID_VOL_MPEGQUANT);
if ((pParam->vol_flags & XVID_VOL_MPEGQUANT)) {
BitstreamPutBit(bs, is_custom_intra_matrix(pParam->mpeg_quant_matrices)); /* load_intra_quant_mat */
if(is_custom_intra_matrix(pParam->mpeg_quant_matrices))
bs_put_matrix(bs, get_intra_matrix(pParam->mpeg_quant_matrices));
BitstreamPutBit(bs, is_custom_inter_matrix(pParam->mpeg_quant_matrices)); /* load_inter_quant_mat */
if(is_custom_inter_matrix(pParam->mpeg_quant_matrices))
bs_put_matrix(bs, get_inter_matrix(pParam->mpeg_quant_matrices));
}
if (vol_ver_id != 1) {
if ((pParam->vol_flags & XVID_VOL_QUARTERPEL))
BitstreamPutBit(bs, 1); /* quarterpel */
else
BitstreamPutBit(bs, 0); /* no quarterpel */
}
BitstreamPutBit(bs, 1); /* complexity_estimation_disable */
BitstreamPutBit(bs, 1); /* resync_marker_disable */
BitstreamPutBit(bs, 0); /* data_partitioned */
if (vol_ver_id != 1) {
BitstreamPutBit(bs, 0); /* newpred_enable */
BitstreamPutBit(bs, (pParam->vol_flags & XVID_VOL_REDUCED_ENABLE)?1:0);
/* reduced_resolution_vop_enabled */
}
BitstreamPutBit(bs, 0); /* scalability */
BitstreamPadAlways(bs); /* next_start_code(); */
/* fake divx5 id, to ensure compatibility with divx5 decoder */
#define DIVX5_ID "DivX999b000p"
if (pParam->max_bframes > 0 && (pParam->global_flags & XVID_GLOBAL_PACKED)) {
BitstreamWriteUserData(bs, DIVX5_ID, strlen(DIVX5_ID));
}
/* xvid id */
{
const char xvid_user_format[] = "XviD%04d%c";
char xvid_user_data[100];
sprintf(xvid_user_data,
xvid_user_format,
XVID_BS_VERSION,
(frame->vop_flags & XVID_VOP_CARTOON)?'C':'\0');
BitstreamWriteUserData(bs, xvid_user_data, strlen(xvid_user_data));
}
}
/*
write vop header
*/
void
BitstreamWriteVopHeader(
Bitstream * const bs,
const MBParam * pParam,
const FRAMEINFO * const frame,
int vop_coded,
unsigned int quant)
{
uint32_t i;
#if 0
BitstreamPad(bs);
#endif
/*
* no padding here, anymore. You have to make sure that you are
* byte aligned, and that always 1-8 padding bits have been written
*/
BitstreamPutBits(bs, VOP_START_CODE, 32);
BitstreamPutBits(bs, frame->coding_type, 2);
#if 0
DPRINTF(XVID_DEBUG_HEADER, "coding_type = %i\n", frame->coding_type);
#endif
for (i = 0; i < frame->seconds; i++) {
BitstreamPutBit(bs, 1);
}
BitstreamPutBit(bs, 0);
WRITE_MARKER();
/* time_increment: value=nth_of_sec, nbits = log2(resolution) */
BitstreamPutBits(bs, frame->ticks, MAX(log2bin(pParam->fbase-1), 1));
#if 0
DPRINTF("[%i:%i] %c",
frame->seconds, frame->ticks,
frame->coding_type == I_VOP ? 'I' :
frame->coding_type == P_VOP ? 'P' :
frame->coding_type == S_VOP ? 'S' : 'B');
#endif
WRITE_MARKER();
if (!vop_coded) {
BitstreamPutBits(bs, 0, 1);
#if 0
BitstreamPadAlways(bs); /* next_start_code() */
#endif
/* NB: It's up to the function caller to write the next_start_code().
* At the moment encoder.c respects that requisite because a VOP
* always ends with a next_start_code either if it's coded or not
* and encoder.c terminates a frame with a next_start_code in whatever
* case */
return;
}
BitstreamPutBits(bs, 1, 1); /* vop_coded */
if ( (frame->coding_type == P_VOP) || (frame->coding_type == S_VOP) )
BitstreamPutBits(bs, frame->rounding_type, 1);
if ((frame->vol_flags & XVID_VOL_REDUCED_ENABLE))
BitstreamPutBit(bs, (frame->vop_flags & XVID_VOP_REDUCED)?1:0);
BitstreamPutBits(bs, 0, 3); /* intra_dc_vlc_threshold */
if ((frame->vol_flags & XVID_VOL_INTERLACING)) {
BitstreamPutBit(bs, (frame->vop_flags & XVID_VOP_TOPFIELDFIRST));
BitstreamPutBit(bs, (frame->vop_flags & XVID_VOP_ALTERNATESCAN));
}
/* if (frame->coding_type == S_VOP) {
if (1) { /* no_of_sprite_warping_points>=1 (we use 2!)
int k;
for (k=0;k<3;k++)
{
bs_put_spritetrajectory(bs, frame->warp.duv[k].x ); /* du[k]
WRITE_MARKER();
bs_put_spritetrajectory(bs, frame->warp.duv[k].y ); /* dv[k]
WRITE_MARKER();
if ((frame->vol_flags & XVID_VOL_QUARTERPEL))
{
DPRINTF(XVID_DEBUG_HEADER,"sprite_warping_point[%i] xy=(%i,%i) *QPEL*\n", k, frame->warp.duv[k].x/2, frame->warp.duv[k].y/2);
}
else
{
DPRINTF(XVID_DEBUG_HEADER,"sprite_warping_point[%i] xy=(%i,%i)\n", k, frame->warp.duv[k].x, frame->warp.duv[k].y);
}
}
}
}*/
#if 0
DPRINTF(XVID_DEBUG_HEADER, "quant = %i\n", quant);
#endif
BitstreamPutBits(bs, quant, 5); /* quantizer */
if (frame->coding_type != I_VOP)
BitstreamPutBits(bs, frame->fcode, 3); /* forward_fixed_code */
if (frame->coding_type == B_VOP)
BitstreamPutBits(bs, frame->bcode, 3); /* backward_fixed_code */
}
void
BitstreamWriteUserData(Bitstream * const bs,
uint8_t * data,
const int length)
{
int i;
BitstreamPad(bs);
BitstreamPutBits(bs, USERDATA_START_CODE, 32);
for (i = 0; i < length; i++) {
BitstreamPutBits(bs, data[i], 8);
}
}