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h264_stream.c
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h264_stream.c
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/*
* h264bitstream - a library for reading and writing H.264 video
* Copyright (C) 2005-2007 Auroras Entertainment, LLC
* Copyright (C) 2008-2011 Avail-TVN
* Copyright (C) 2012 Alex Izvorski
*
* Written by Alex Izvorski <aizvorski@gmail.com> and Alex Giladi <alex.giladi@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include "bs.h"
#include "h264_stream.h"
#include "h264_sei.h"
FILE* h264_dbgfile = NULL;
#define printf(...) fprintf((h264_dbgfile == NULL ? stdout : h264_dbgfile), __VA_ARGS__)
/**
Calculate the log base 2 of the argument, rounded up.
Zero or negative arguments return zero
Idea from http://www.southwindsgames.com/blog/2009/01/19/fast-integer-log2-function-in-cc/
*/
int intlog2(int x)
{
int log = 0;
if (x < 0) { x = 0; }
while ((x >> log) > 0)
{
log++;
}
if (log > 0 && x == 1<<(log-1)) { log--; }
return log;
}
int is_slice_type(int slice_type, int cmp_type)
{
if (slice_type >= 5) { slice_type -= 5; }
if (cmp_type >= 5) { cmp_type -= 5; }
if (slice_type == cmp_type) { return 1; }
else { return 0; }
}
int more_rbsp_data(bs_t* bs)
{
// TODO this version handles reading only. writing version?
// no more data
if (bs_eof(bs)) { return 0; }
// no rbsp_stop_bit yet
if (bs_peek_u1(bs) == 0) { return 1; }
// next bit is 1, is it the rsbp_stop_bit? only if the rest of bits are 0
bs_t bs_tmp;
bs_clone(&bs_tmp, bs);
bs_skip_u1(&bs_tmp);
while(!bs_eof(&bs_tmp))
{
// A later bit was 1, it wasn't the rsbp_stop_bit
if (bs_read_u1(&bs_tmp) == 1) { return 1; }
}
// All following bits were 0, it was the rsbp_stop_bit
return 0;
}
int more_rbsp_trailing_data(h264_stream_t* h, bs_t* b) { return !bs_eof(b); }
int _read_ff_coded_number(bs_t* b)
{
int n1 = 0;
int n2;
do
{
n2 = bs_read_u8(b);
n1 += n2;
} while (n2 == 0xff);
return n1;
}
void _write_ff_coded_number(bs_t* b, int n)
{
while (1)
{
if (n > 0xff)
{
bs_write_u8(b, 0xff);
n -= 0xff;
}
else
{
bs_write_u8(b, n);
break;
}
}
}
void debug_bytes(uint8_t* buf, int len)
{
int i;
for (i = 0; i < len; i++)
{
printf("%02X ", buf[i]);
if ((i+1) % 16 == 0) { printf ("\n"); }
}
printf("\n");
}
void read_nal_unit_header_svc_extension(nal_svc_ext_t* nal_svc_ext, bs_t* b);
void read_prefix_nal_unit_svc(nal_t* nal, bs_t* b);
void read_prefix_nal_unit_rbsp(nal_t* nal, bs_t* b);
void read_seq_parameter_set_rbsp(sps_t* sps, bs_t* b);
void read_scaling_list(bs_t* b, int* scalingList, int sizeOfScalingList, int* useDefaultScalingMatrixFlag );
void read_subset_seq_parameter_set_rbsp(sps_subset_t* sps_subset, bs_t* b);
void read_seq_parameter_set_svc_extension(sps_subset_t* sps_subset, bs_t* b);
void read_svc_vui_parameters_extension(sps_svc_ext_t* sps_svc_ext, bs_t* b);
void read_vui_parameters(sps_t* sps, bs_t* b);
void read_hrd_parameters(hrd_t* hrd, bs_t* b);
void read_pic_parameter_set_rbsp(h264_stream_t* h, bs_t* b);
void read_sei_rbsp(h264_stream_t* h, bs_t* b);
void read_sei_message(h264_stream_t* h, bs_t* b);
void read_access_unit_delimiter_rbsp(h264_stream_t* h, bs_t* b);
void read_end_of_seq_rbsp(h264_stream_t* h, bs_t* b);
void read_end_of_stream_rbsp(h264_stream_t* h, bs_t* b);
void read_filler_data_rbsp(h264_stream_t* h, bs_t* b);
void read_slice_layer_rbsp(h264_stream_t* h, bs_t* b);
void read_rbsp_slice_trailing_bits(h264_stream_t* h, bs_t* b);
void read_rbsp_trailing_bits(bs_t* b);
void read_slice_header(h264_stream_t* h, bs_t* b);
void read_ref_pic_list_reordering(h264_stream_t* h, bs_t* b);
void read_pred_weight_table(h264_stream_t* h, bs_t* b);
void read_dec_ref_pic_marking(h264_stream_t* h, bs_t* b);
void read_slice_header_in_scalable_extension(h264_stream_t* h, bs_t* b);
void read_dec_ref_base_pic_marking(nal_t* nal, bs_t* b);
//7.3.1 NAL unit syntax
int read_nal_unit(h264_stream_t* h, uint8_t* buf, int size)
{
nal_t* nal = h->nal;
int nal_size = size;
int rbsp_size = size;
uint8_t* rbsp_buf = (uint8_t*)calloc(1, rbsp_size);
if( 1 )
{
int rc = nal_to_rbsp(buf, &nal_size, rbsp_buf, &rbsp_size);
if (rc < 0) { free(rbsp_buf); return -1; } // handle conversion error
}
if( 0 )
{
rbsp_size = size*3/4; // NOTE this may have to be slightly smaller (3/4 smaller, worst case) in order to be guaranteed to fit
}
bs_t* b = bs_new(rbsp_buf, rbsp_size);
/* forbidden_zero_bit */ bs_skip_u(b, 1);
nal->nal_ref_idc = bs_read_u(b, 2);
nal->nal_unit_type = bs_read_u(b, 5);
if( nal->nal_unit_type == 14 || nal->nal_unit_type == 21 || nal->nal_unit_type == 20 )
{
if( nal->nal_unit_type != 21 )
{
nal->svc_extension_flag = bs_read_u1(b);
}
else
{
nal->avc_3d_extension_flag = bs_read_u1(b);
}
if( nal->svc_extension_flag )
{
read_nal_unit_header_svc_extension(nal->nal_svc_ext, b);
}
}
switch ( nal->nal_unit_type )
{
case NAL_UNIT_TYPE_CODED_SLICE_IDR:
case NAL_UNIT_TYPE_CODED_SLICE_NON_IDR:
case NAL_UNIT_TYPE_CODED_SLICE_AUX:
read_slice_layer_rbsp(h, b);
break;
#ifdef HAVE_SEI
case NAL_UNIT_TYPE_SEI:
read_sei_rbsp(h, b);
read_rbsp_trailing_bits(b);
break;
#endif
case NAL_UNIT_TYPE_SPS:
read_seq_parameter_set_rbsp(h->sps, b);
read_rbsp_trailing_bits(b);
if( 1 )
{
memcpy(h->sps_table[h->sps->seq_parameter_set_id], h->sps, sizeof(sps_t));
}
break;
case NAL_UNIT_TYPE_PPS:
read_pic_parameter_set_rbsp(h, b);
read_rbsp_trailing_bits(b);
break;
case NAL_UNIT_TYPE_AUD:
read_access_unit_delimiter_rbsp(h, b);
read_rbsp_trailing_bits(b);
break;
case NAL_UNIT_TYPE_END_OF_SEQUENCE:
read_end_of_seq_rbsp(h, b);
read_rbsp_trailing_bits(b);
break;
case NAL_UNIT_TYPE_END_OF_STREAM:
read_end_of_stream_rbsp(h, b);
read_rbsp_trailing_bits(b);
break;
//SVC support
case NAL_UNIT_TYPE_SUBSET_SPS:
read_subset_seq_parameter_set_rbsp(h->sps_subset, b);
read_rbsp_trailing_bits(b);
if( 1 )
{
memcpy(h->sps_subset_table[h->sps_subset->sps->seq_parameter_set_id], h->sps_subset, sizeof(sps_subset_t));
//memcpy(h->sps_subset_table[h->sps_subset->sps->seq_parameter_set_id]->sps, h->sps_subset->sps, sizeof(sps_t));
//memcpy(h->sps_subset_table[h->sps_subset->sps->seq_parameter_set_id]->sps_svc_ext, h->sps_subset->sps_svc_ext, sizeof(sps_svc_ext_t));
//h->sps_subset_table[h->sps_subset->sps->seq_parameter_set_id]->additional_extension2_flag = h->sps_subset->additional_extension2_flag;
}
break;
//prefix NAL
case NAL_UNIT_TYPE_PREFIX_NAL:
read_prefix_nal_unit_rbsp(h->nal, b);
read_rbsp_trailing_bits(b);
break;
//SVC support
case NAL_UNIT_TYPE_CODED_SLICE_SVC_EXTENSION:
read_slice_layer_rbsp(h, b);
break;
case NAL_UNIT_TYPE_FILLER:
case NAL_UNIT_TYPE_SPS_EXT:
case NAL_UNIT_TYPE_UNSPECIFIED:
case NAL_UNIT_TYPE_CODED_SLICE_DATA_PARTITION_A:
case NAL_UNIT_TYPE_CODED_SLICE_DATA_PARTITION_B:
case NAL_UNIT_TYPE_CODED_SLICE_DATA_PARTITION_C:
default:
bs_free(b);
free(rbsp_buf);
return -1;
}
if (bs_overrun(b)) { bs_free(b); free(rbsp_buf); return -1; }
if( 0 )
{
// now get the actual size used
rbsp_size = bs_pos(b);
int rc = rbsp_to_nal(rbsp_buf, &rbsp_size, buf, &nal_size);
if (rc < 0) { bs_free(b); free(rbsp_buf); return -1; }
}
bs_free(b);
free(rbsp_buf);
return nal_size;
}
//G.7.3.1.1 NAL unit header SVC extension syntax
void read_nal_unit_header_svc_extension(nal_svc_ext_t* nal_svc_ext, bs_t* b)
{
nal_svc_ext->idr_flag = bs_read_u1(b);
nal_svc_ext->priority_id = bs_read_u(b, 6);
nal_svc_ext->no_inter_layer_pred_flag = bs_read_u1(b);
nal_svc_ext->dependency_id = bs_read_u(b, 3);
nal_svc_ext->quality_id = bs_read_u(b, 4);
nal_svc_ext->temporal_id = bs_read_u(b, 3);
nal_svc_ext->use_ref_base_pic_flag = bs_read_u1(b);
nal_svc_ext->discardable_flag = bs_read_u1(b);
nal_svc_ext->output_flag = bs_read_u1(b);
nal_svc_ext->reserved_three_2bits = bs_read_u(b, 2);
}
//G.7.3.2.12.1 Prefix NAL unit SVC syntax
void read_prefix_nal_unit_svc(nal_t* nal, bs_t* b)
{
if( nal->nal_ref_idc != 0 )
{
nal->prefix_nal_svc->store_ref_base_pic_flag = bs_read_u1(b);
if( ( nal->nal_svc_ext->use_ref_base_pic_flag || nal->prefix_nal_svc->store_ref_base_pic_flag ) &&
!nal->nal_svc_ext->idr_flag )
{
read_dec_ref_base_pic_marking( nal, b );
}
nal->prefix_nal_svc->additional_prefix_nal_unit_extension_flag = bs_read_u1(b);
if( nal->prefix_nal_svc->additional_prefix_nal_unit_extension_flag )
{
while( more_rbsp_data( b ) )
{
nal->prefix_nal_svc->additional_prefix_nal_unit_extension_data_flag = bs_read_u1(b);
}
}
}
else if( more_rbsp_data( b ) )
{
while( more_rbsp_data( b ) )
{
nal->prefix_nal_svc->additional_prefix_nal_unit_extension_data_flag = bs_read_u1(b);
}
}
}
//7.3.2.12 Prefix NAL unit RBSP syntax
void read_prefix_nal_unit_rbsp(nal_t* nal, bs_t* b)
{
if( nal->svc_extension_flag )
{
read_prefix_nal_unit_svc(nal, b);
}
}
//7.3.2.1 Sequence parameter set RBSP syntax
void read_seq_parameter_set_rbsp(sps_t* sps, bs_t* b)
{
int i;
if( 1 )
{
memset(sps, 0, sizeof(sps_t));
sps->chroma_format_idc = 1;
}
sps->profile_idc = bs_read_u8(b);
sps->constraint_set0_flag = bs_read_u1(b);
sps->constraint_set1_flag = bs_read_u1(b);
sps->constraint_set2_flag = bs_read_u1(b);
sps->constraint_set3_flag = bs_read_u1(b);
sps->constraint_set4_flag = bs_read_u1(b);
sps->constraint_set5_flag = bs_read_u1(b);
/* reserved_zero_2bits */ bs_skip_u(b, 2);
sps->level_idc = bs_read_u8(b);
sps->seq_parameter_set_id = bs_read_ue(b);
if( sps->profile_idc == 100 || sps->profile_idc == 110 ||
sps->profile_idc == 122 || sps->profile_idc == 244 ||
sps->profile_idc == 44 || sps->profile_idc == 83 ||
sps->profile_idc == 86 || sps->profile_idc == 118 ||
sps->profile_idc == 128 || sps->profile_idc == 138 ||
sps->profile_idc == 139 || sps->profile_idc == 134
)
{
sps->chroma_format_idc = bs_read_ue(b);
if( sps->chroma_format_idc == 3 )
{
sps->residual_colour_transform_flag = bs_read_u1(b);
}
sps->bit_depth_luma_minus8 = bs_read_ue(b);
sps->bit_depth_chroma_minus8 = bs_read_ue(b);
sps->qpprime_y_zero_transform_bypass_flag = bs_read_u1(b);
sps->seq_scaling_matrix_present_flag = bs_read_u1(b);
if( sps->seq_scaling_matrix_present_flag )
{
for( i = 0; i < ((sps->chroma_format_idc != 3) ? 8 : 12); i++ )
{
sps->seq_scaling_list_present_flag[ i ] = bs_read_u1(b);
if( sps->seq_scaling_list_present_flag[ i ] )
{
if( i < 6 )
{
read_scaling_list( b, sps->ScalingList4x4[ i ], 16,
&( sps->UseDefaultScalingMatrix4x4Flag[ i ] ) );
}
else
{
read_scaling_list( b, sps->ScalingList8x8[ i - 6 ], 64,
&( sps->UseDefaultScalingMatrix8x8Flag[ i - 6 ] ) );
}
}
}
}
}
sps->log2_max_frame_num_minus4 = bs_read_ue(b);
sps->pic_order_cnt_type = bs_read_ue(b);
if( sps->pic_order_cnt_type == 0 )
{
sps->log2_max_pic_order_cnt_lsb_minus4 = bs_read_ue(b);
}
else if( sps->pic_order_cnt_type == 1 )
{
sps->delta_pic_order_always_zero_flag = bs_read_u1(b);
sps->offset_for_non_ref_pic = bs_read_se(b);
sps->offset_for_top_to_bottom_field = bs_read_se(b);
sps->num_ref_frames_in_pic_order_cnt_cycle = bs_read_ue(b);
for( i = 0; i < sps->num_ref_frames_in_pic_order_cnt_cycle; i++ )
{
sps->offset_for_ref_frame[ i ] = bs_read_se(b);
}
}
sps->num_ref_frames = bs_read_ue(b);
sps->gaps_in_frame_num_value_allowed_flag = bs_read_u1(b);
sps->pic_width_in_mbs_minus1 = bs_read_ue(b);
sps->pic_height_in_map_units_minus1 = bs_read_ue(b);
sps->frame_mbs_only_flag = bs_read_u1(b);
if( !sps->frame_mbs_only_flag )
{
sps->mb_adaptive_frame_field_flag = bs_read_u1(b);
}
sps->direct_8x8_inference_flag = bs_read_u1(b);
sps->frame_cropping_flag = bs_read_u1(b);
if( sps->frame_cropping_flag )
{
sps->frame_crop_left_offset = bs_read_ue(b);
sps->frame_crop_right_offset = bs_read_ue(b);
sps->frame_crop_top_offset = bs_read_ue(b);
sps->frame_crop_bottom_offset = bs_read_ue(b);
}
sps->vui_parameters_present_flag = bs_read_u1(b);
if( sps->vui_parameters_present_flag )
{
read_vui_parameters(sps, b);
}
}
//7.3.2.1.1 Scaling list syntax
void read_scaling_list(bs_t* b, int* scalingList, int sizeOfScalingList, int* useDefaultScalingMatrixFlag )
{
// NOTE need to be able to set useDefaultScalingMatrixFlag when reading, hence passing as pointer
int lastScale = 8;
int nextScale = 8;
int delta_scale;
for( int j = 0; j < sizeOfScalingList; j++ )
{
if( nextScale != 0 )
{
if( 0 )
{
nextScale = scalingList[ j ];
if (useDefaultScalingMatrixFlag[0]) { nextScale = 0; }
delta_scale = (nextScale - lastScale) % 256 ;
}
delta_scale = bs_read_se(b);
if( 1 )
{
nextScale = ( lastScale + delta_scale + 256 ) % 256;
useDefaultScalingMatrixFlag[0] = ( j == 0 && nextScale == 0 );
}
}
if( 1 )
{
scalingList[ j ] = ( nextScale == 0 ) ? lastScale : nextScale;
}
lastScale = scalingList[ j ];
}
}
//7.3.2.1.3 Subset sequence parameter set RBSP syntax
void read_subset_seq_parameter_set_rbsp(sps_subset_t* sps_subset, bs_t* b)
{
read_seq_parameter_set_rbsp(sps_subset->sps, b);
switch( sps_subset->sps->profile_idc )
{
case 83:
case 86:
read_seq_parameter_set_svc_extension(sps_subset, b); /* specified in Annex G */
sps_svc_ext_t* sps_svc_ext = sps_subset->sps_svc_ext;
sps_svc_ext->svc_vui_parameters_present_flag = bs_read_u1(b);
if( sps_svc_ext->svc_vui_parameters_present_flag )
{
read_svc_vui_parameters_extension(sps_svc_ext,b); /* specified in Annex G */
}
break;
default:
break;
}
sps_subset->additional_extension2_flag = bs_read_u1(b);
if( sps_subset->additional_extension2_flag )
{
while( more_rbsp_data( b ) )
{
sps_subset->additional_extension2_flag = bs_read_u1(b);
}
}
}
//Appendix G.7.3.2.1.4 Sequence parameter set SVC extension syntax
void read_seq_parameter_set_svc_extension(sps_subset_t* sps_subset, bs_t* b)
{
sps_svc_ext_t* sps_svc_ext = sps_subset->sps_svc_ext;
sps_svc_ext->inter_layer_deblocking_filter_control_present_flag = bs_read_u1(b);
sps_svc_ext->extended_spatial_scalability_idc = bs_read_u(b, 2);
if( sps_subset->sps->chroma_format_idc == 1 || sps_subset->sps->chroma_format_idc == 2 )
{
sps_svc_ext->chroma_phase_x_plus1_flag = bs_read_u1(b);
}
if( sps_subset->sps->chroma_format_idc == 1 )
{
sps_svc_ext->chroma_phase_y_plus1 = bs_read_u(b, 2);
}
if( sps_svc_ext->extended_spatial_scalability_idc )
{
if( sps_subset->sps->chroma_format_idc > 0 )
{
sps_svc_ext->seq_ref_layer_chroma_phase_x_plus1_flag = bs_read_u1(b);
sps_svc_ext->seq_ref_layer_chroma_phase_y_plus1 = bs_read_u(b, 2);
}
sps_svc_ext->seq_scaled_ref_layer_left_offset = bs_read_se(b);
sps_svc_ext->seq_scaled_ref_layer_top_offset = bs_read_se(b);
sps_svc_ext->seq_scaled_ref_layer_right_offset = bs_read_se(b);
sps_svc_ext->seq_scaled_ref_layer_bottom_offset = bs_read_se(b);
}
sps_svc_ext->seq_tcoeff_level_prediction_flag = bs_read_u1(b);
if( sps_svc_ext->seq_tcoeff_level_prediction_flag )
{
sps_svc_ext->adaptive_tcoeff_level_prediction_flag = bs_read_u1(b);
}
sps_svc_ext->slice_header_restriction_flag = bs_read_u1(b);
}
//Appendix G.14.1 SVC VUI parameters extension syntax
void read_svc_vui_parameters_extension(sps_svc_ext_t* sps_svc_ext, bs_t* b)
{
sps_svc_ext->vui.vui_ext_num_entries_minus1 = bs_read_ue(b);
for( int i = 0; i <= sps_svc_ext->vui.vui_ext_num_entries_minus1; i++ )
{
sps_svc_ext->vui.vui_ext_dependency_id[i] = bs_read_u(b, 3);
sps_svc_ext->vui.vui_ext_quality_id[i] = bs_read_u(b, 4);
sps_svc_ext->vui.vui_ext_temporal_id[i] = bs_read_u(b, 3);
sps_svc_ext->vui.vui_ext_timing_info_present_flag[i] = bs_read_u1(b);
if( sps_svc_ext->vui.vui_ext_timing_info_present_flag[i] )
{
sps_svc_ext->vui.vui_ext_num_units_in_tick[i] = bs_read_u(b, 32);
sps_svc_ext->vui.vui_ext_time_scale[i] = bs_read_u(b, 32);
sps_svc_ext->vui.vui_ext_fixed_frame_rate_flag[i] = bs_read_u1(b);
}
sps_svc_ext->vui.vui_ext_nal_hrd_parameters_present_flag[i] = bs_read_u1(b);
if( sps_svc_ext->vui.vui_ext_nal_hrd_parameters_present_flag[i] )
{
read_hrd_parameters(&sps_svc_ext->hrd_vcl[i], b);
}
sps_svc_ext->vui.vui_ext_vcl_hrd_parameters_present_flag[i] = bs_read_u1(b);
if( sps_svc_ext->vui.vui_ext_vcl_hrd_parameters_present_flag[i] )
{
read_hrd_parameters(&sps_svc_ext->hrd_nal[i], b);
}
if( sps_svc_ext->vui.vui_ext_nal_hrd_parameters_present_flag[i] ||
sps_svc_ext->vui.vui_ext_vcl_hrd_parameters_present_flag[i] )
{
sps_svc_ext->vui.vui_ext_low_delay_hrd_flag[i] = bs_read_u1(b);
}
sps_svc_ext->vui.vui_ext_pic_struct_present_flag[i] = bs_read_u1(b);
}
}
//Appendix E.1.1 VUI parameters syntax
void read_vui_parameters(sps_t* sps, bs_t* b)
{
sps->vui.aspect_ratio_info_present_flag = bs_read_u1(b);
if( sps->vui.aspect_ratio_info_present_flag )
{
sps->vui.aspect_ratio_idc = bs_read_u8(b);
if( sps->vui.aspect_ratio_idc == SAR_Extended )
{
sps->vui.sar_width = bs_read_u(b, 16);
sps->vui.sar_height = bs_read_u(b, 16);
}
}
sps->vui.overscan_info_present_flag = bs_read_u1(b);
if( sps->vui.overscan_info_present_flag )
{
sps->vui.overscan_appropriate_flag = bs_read_u1(b);
}
sps->vui.video_signal_type_present_flag = bs_read_u1(b);
if( sps->vui.video_signal_type_present_flag )
{
sps->vui.video_format = bs_read_u(b, 3);
sps->vui.video_full_range_flag = bs_read_u1(b);
sps->vui.colour_description_present_flag = bs_read_u1(b);
if( sps->vui.colour_description_present_flag )
{
sps->vui.colour_primaries = bs_read_u8(b);
sps->vui.transfer_characteristics = bs_read_u8(b);
sps->vui.matrix_coefficients = bs_read_u8(b);
}
}
sps->vui.chroma_loc_info_present_flag = bs_read_u1(b);
if( sps->vui.chroma_loc_info_present_flag )
{
sps->vui.chroma_sample_loc_type_top_field = bs_read_ue(b);
sps->vui.chroma_sample_loc_type_bottom_field = bs_read_ue(b);
}
sps->vui.timing_info_present_flag = bs_read_u1(b);
if( sps->vui.timing_info_present_flag )
{
sps->vui.num_units_in_tick = bs_read_u(b, 32);
sps->vui.time_scale = bs_read_u(b, 32);
sps->vui.fixed_frame_rate_flag = bs_read_u1(b);
}
sps->vui.nal_hrd_parameters_present_flag = bs_read_u1(b);
if( sps->vui.nal_hrd_parameters_present_flag )
{
read_hrd_parameters(&sps->hrd_nal, b);
}
sps->vui.vcl_hrd_parameters_present_flag = bs_read_u1(b);
if( sps->vui.vcl_hrd_parameters_present_flag )
{
read_hrd_parameters(&sps->hrd_vcl, b);
}
if( sps->vui.nal_hrd_parameters_present_flag || sps->vui.vcl_hrd_parameters_present_flag )
{
sps->vui.low_delay_hrd_flag = bs_read_u1(b);
}
sps->vui.pic_struct_present_flag = bs_read_u1(b);
sps->vui.bitstream_restriction_flag = bs_read_u1(b);
if( sps->vui.bitstream_restriction_flag )
{
sps->vui.motion_vectors_over_pic_boundaries_flag = bs_read_u1(b);
sps->vui.max_bytes_per_pic_denom = bs_read_ue(b);
sps->vui.max_bits_per_mb_denom = bs_read_ue(b);
sps->vui.log2_max_mv_length_horizontal = bs_read_ue(b);
sps->vui.log2_max_mv_length_vertical = bs_read_ue(b);
sps->vui.num_reorder_frames = bs_read_ue(b);
sps->vui.max_dec_frame_buffering = bs_read_ue(b);
}
}
//Appendix E.1.2 HRD parameters syntax
void read_hrd_parameters(hrd_t* hrd, bs_t* b)
{
hrd->cpb_cnt_minus1 = bs_read_ue(b);
hrd->bit_rate_scale = bs_read_u(b, 4);
hrd->cpb_size_scale = bs_read_u(b, 4);
for( int SchedSelIdx = 0; SchedSelIdx <= hrd->cpb_cnt_minus1; SchedSelIdx++ )
{
hrd->bit_rate_value_minus1[ SchedSelIdx ] = bs_read_ue(b);
hrd->cpb_size_value_minus1[ SchedSelIdx ] = bs_read_ue(b);
hrd->cbr_flag[ SchedSelIdx ] = bs_read_u1(b);
}
hrd->initial_cpb_removal_delay_length_minus1 = bs_read_u(b, 5);
hrd->cpb_removal_delay_length_minus1 = bs_read_u(b, 5);
hrd->dpb_output_delay_length_minus1 = bs_read_u(b, 5);
hrd->time_offset_length = bs_read_u(b, 5);
}
/*
UNIMPLEMENTED
//7.3.2.1.2 Sequence parameter set extension RBSP syntax
int read_seq_parameter_set_extension_rbsp(bs_t* b, sps_ext_t* sps_ext) {
seq_parameter_set_id = bs_read_ue(b);
aux_format_idc = bs_read_ue(b);
if( aux_format_idc != 0 ) {
bit_depth_aux_minus8 = bs_read_ue(b);
alpha_incr_flag = bs_read_u1(b);
alpha_opaque_value = bs_read_u(v);
alpha_transparent_value = bs_read_u(v);
}
additional_extension_flag = bs_read_u1(b);
read_rbsp_trailing_bits();
}
*/
//7.3.2.2 Picture parameter set RBSP syntax
void read_pic_parameter_set_rbsp(h264_stream_t* h, bs_t* b)
{
pps_t* pps = h->pps;
if( 1 )
{
memset(pps, 0, sizeof(pps_t));
}
pps->pic_parameter_set_id = bs_read_ue(b);
pps->seq_parameter_set_id = bs_read_ue(b);
pps->entropy_coding_mode_flag = bs_read_u1(b);
pps->pic_order_present_flag = bs_read_u1(b);
pps->num_slice_groups_minus1 = bs_read_ue(b);
if( pps->num_slice_groups_minus1 > 0 )
{
pps->slice_group_map_type = bs_read_ue(b);
if( pps->slice_group_map_type == 0 )
{
for( int i_group = 0; i_group <= pps->num_slice_groups_minus1; i_group++ )
{
pps->run_length_minus1[ i_group ] = bs_read_ue(b);
}
}
else if( pps->slice_group_map_type == 2 )
{
for( int i_group = 0; i_group < pps->num_slice_groups_minus1; i_group++ )
{
pps->top_left[ i_group ] = bs_read_ue(b);
pps->bottom_right[ i_group ] = bs_read_ue(b);
}
}
else if( pps->slice_group_map_type == 3 ||
pps->slice_group_map_type == 4 ||
pps->slice_group_map_type == 5 )
{
pps->slice_group_change_direction_flag = bs_read_u1(b);
pps->slice_group_change_rate_minus1 = bs_read_ue(b);
}
else if( pps->slice_group_map_type == 6 )
{
pps->pic_size_in_map_units_minus1 = bs_read_ue(b);
for( int i = 0; i <= pps->pic_size_in_map_units_minus1; i++ )
{
int v = intlog2( pps->num_slice_groups_minus1 + 1 );
pps->slice_group_id[ i ] = bs_read_u(b, v);
}
}
}
pps->num_ref_idx_l0_active_minus1 = bs_read_ue(b);
pps->num_ref_idx_l1_active_minus1 = bs_read_ue(b);
pps->weighted_pred_flag = bs_read_u1(b);
pps->weighted_bipred_idc = bs_read_u(b, 2);
pps->pic_init_qp_minus26 = bs_read_se(b);
pps->pic_init_qs_minus26 = bs_read_se(b);
pps->chroma_qp_index_offset = bs_read_se(b);
pps->deblocking_filter_control_present_flag = bs_read_u1(b);
pps->constrained_intra_pred_flag = bs_read_u1(b);
pps->redundant_pic_cnt_present_flag = bs_read_u1(b);
int have_more_data = 0;
if( 1 ) { have_more_data = more_rbsp_data(b); }
if( 0 )
{
have_more_data = pps->transform_8x8_mode_flag | pps->pic_scaling_matrix_present_flag | pps->second_chroma_qp_index_offset != 0;
}
if( have_more_data )
{
pps->transform_8x8_mode_flag = bs_read_u1(b);
pps->pic_scaling_matrix_present_flag = bs_read_u1(b);
if( pps->pic_scaling_matrix_present_flag )
{
for( int i = 0; i < 6 + 2* pps->transform_8x8_mode_flag; i++ )
{
pps->pic_scaling_list_present_flag[ i ] = bs_read_u1(b);
if( pps->pic_scaling_list_present_flag[ i ] )
{
if( i < 6 )
{
read_scaling_list( b, pps->ScalingList4x4[ i ], 16,
&( pps->UseDefaultScalingMatrix4x4Flag[ i ] ) );
}
else
{
read_scaling_list( b, pps->ScalingList8x8[ i - 6 ], 64,
&( pps->UseDefaultScalingMatrix8x8Flag[ i - 6 ] ) );
}
}
}
}
pps->second_chroma_qp_index_offset = bs_read_se(b);
}
if( 1 )
{
memcpy(h->pps_table[pps->pic_parameter_set_id], h->pps, sizeof(pps_t));
}
}
#ifdef HAVE_SEI
//7.3.2.3 Supplemental enhancement information RBSP syntax
void read_sei_rbsp(h264_stream_t* h, bs_t* b)
{
if( 1 )
{
for( int i = 0; i < h->num_seis; i++ )
{
sei_free(h->seis[i]);
}
h->num_seis = 0;
do {
h->num_seis++;
h->seis = (sei_t**)realloc(h->seis, h->num_seis * sizeof(sei_t*));
h->seis[h->num_seis - 1] = sei_new();
h->sei = h->seis[h->num_seis - 1];
read_sei_message(h, b);
} while( more_rbsp_data(b) );
}
if( 0 )
{
for (int i = 0; i < h->num_seis; i++)
{
h->sei = h->seis[i];
read_sei_message(h, b);
}
h->sei = NULL;
}
}
//7.3.2.3.1 Supplemental enhancement information message syntax
void read_sei_message(h264_stream_t* h, bs_t* b)
{
if( 0 )
{
_write_ff_coded_number(b, h->sei->payloadType);
_write_ff_coded_number(b, h->sei->payloadSize);
}
if( 1 )
{
h->sei->payloadType = _read_ff_coded_number(b);
h->sei->payloadSize = _read_ff_coded_number(b);
}
read_sei_payload( h, b );
}
#endif
//7.3.2.4 Access unit delimiter RBSP syntax
void read_access_unit_delimiter_rbsp(h264_stream_t* h, bs_t* b)
{
h->aud->primary_pic_type = bs_read_u(b, 3);
}
//7.3.2.5 End of sequence RBSP syntax
void read_end_of_seq_rbsp(h264_stream_t* h, bs_t* b)
{
}
//7.3.2.6 End of stream RBSP syntax
void read_end_of_stream_rbsp(h264_stream_t* h, bs_t* b)
{
}
//7.3.2.7 Filler data RBSP syntax
void read_filler_data_rbsp(h264_stream_t* h, bs_t* b)
{
while( bs_next_bits(b, 8) == 0xFF )
{
/* ff_byte */ bs_skip_u(b, 8);
}
}
//7.3.2.8 Slice layer without partitioning RBSP syntax
void read_slice_layer_rbsp(h264_stream_t* h, bs_t* b)
{
if (h->nal->nal_unit_type != NAL_UNIT_TYPE_CODED_SLICE_SVC_EXTENSION)
read_slice_header(h, b);
else
read_slice_header_in_scalable_extension(h, b);
slice_data_rbsp_t* slice_data = h->slice_data;
if ( slice_data != NULL )
{
if ( slice_data->rbsp_buf != NULL ) free( slice_data->rbsp_buf );
uint8_t *sptr = b->p + (!!b->bits_left); // CABAC-specific: skip alignment bits, if there are any
slice_data->rbsp_size = b->end - sptr;
slice_data->rbsp_buf = (uint8_t*)malloc(slice_data->rbsp_size);
memcpy( slice_data->rbsp_buf, sptr, slice_data->rbsp_size );
// ugly hack: since next NALU starts at byte border, we are going to be padded by trailing_bits;
return;
}
// FIXME should read or skip data
//slice_data( ); /* all categories of slice_data( ) syntax */
read_rbsp_slice_trailing_bits(h, b);
}
/*
// UNIMPLEMENTED
//7.3.2.9.1 Slice data partition A RBSP syntax
slice_data_partition_a_layer_rbsp( ) {
read_slice_header( ); // only category 2
slice_id = bs_read_ue(b)
read_slice_data( ); // only category 2
read_rbsp_slice_trailing_bits( ); // only category 2
}
//7.3.2.9.2 Slice data partition B RBSP syntax
slice_data_partition_b_layer_rbsp( ) {
slice_id = bs_read_ue(b); // only category 3
if( redundant_pic_cnt_present_flag )
redundant_pic_cnt = bs_read_ue(b);
read_slice_data( ); // only category 3
read_rbsp_slice_trailing_bits( ); // only category 3
}
//7.3.2.9.3 Slice data partition C RBSP syntax
slice_data_partition_c_layer_rbsp( ) {
slice_id = bs_read_ue(b); // only category 4
if( redundant_pic_cnt_present_flag )
redundant_pic_cnt = bs_read_ue(b);
read_slice_data( ); // only category 4
rbsp_slice_trailing_bits( ); // only category 4
}
*/
//7.3.2.10 RBSP slice trailing bits syntax
void read_rbsp_slice_trailing_bits(h264_stream_t* h, bs_t* b)
{
read_rbsp_trailing_bits(b);
if( h->pps->entropy_coding_mode_flag )
{
while( more_rbsp_trailing_data(h, b) )
{
/* cabac_zero_word */ bs_skip_u(b, 16);
}
}
}
//7.3.2.11 RBSP trailing bits syntax
void read_rbsp_trailing_bits(bs_t* b)
{
/* rbsp_stop_one_bit */ bs_skip_u(b, 1);
while( !bs_byte_aligned(b) )
{
/* rbsp_alignment_zero_bit */ bs_skip_u(b, 1);
}
}
//7.3.3 Slice header syntax
void read_slice_header(h264_stream_t* h, bs_t* b)
{
slice_header_t* sh = h->sh;
if( 1 )
{
memset(sh, 0, sizeof(slice_header_t));
}
nal_t* nal = h->nal;
sh->first_mb_in_slice = bs_read_ue(b);
sh->slice_type = bs_read_ue(b);
sh->pic_parameter_set_id = bs_read_ue(b);
// TODO check existence, otherwise fail
pps_t* pps = h->pps;
sps_t* sps = h->sps;
memcpy(h->pps, h->pps_table[sh->pic_parameter_set_id], sizeof(pps_t));
memcpy(h->sps, h->sps_table[pps->seq_parameter_set_id], sizeof(sps_t));
if (sps->residual_colour_transform_flag)
{
sh->colour_plane_id = bs_read_u(b, 2);
}
sh->frame_num = bs_read_u(b, sps->log2_max_frame_num_minus4 + 4 ); // was u(v)
if( !sps->frame_mbs_only_flag )
{
sh->field_pic_flag = bs_read_u1(b);
if( sh->field_pic_flag )
{
sh->bottom_field_flag = bs_read_u1(b);
}
}
if( nal->nal_unit_type == 5 )
{
sh->idr_pic_id = bs_read_ue(b);
}
if( sps->pic_order_cnt_type == 0 )