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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
*
* Written by Alex Izvorski <[email protected]> and Alex Giladi <[email protected]>
*
* 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; }
}
/***************************** reading ******************************/
/**
Create a new H264 stream object. Allocates all structures contained within it.
@return the stream object
*/
h264_stream_t* h264_new()
{
h264_stream_t* h = (h264_stream_t*)calloc(1, sizeof(h264_stream_t));
h->nal = (nal_t*)calloc(1, sizeof(nal_t));
// initialize tables
for ( int i = 0; i < 32; i++ ) { h->sps_table[i] = (sps_t*)calloc(1, sizeof(sps_t)); }
for ( int i = 0; i < 256; i++ ) { h->pps_table[i] = (pps_t*)calloc(1, sizeof(pps_t)); }
h->sps = h->sps_table[0];
h->pps = h->pps_table[0];
h->aud = (aud_t*)calloc(1, sizeof(aud_t));
h->num_seis = 0;
h->seis = NULL;
h->sei = NULL; //This is a TEMP pointer at whats in h->seis...
h->sh = (slice_header_t*)calloc(1, sizeof(slice_header_t));
return h;
}
/**
Free an existing H264 stream object. Frees all contained structures.
@param[in,out] h the stream object
*/
void h264_free(h264_stream_t* h)
{
free(h->nal);
for ( int i = 0; i < 32; i++ ) { free( h->sps_table[i] ); }
for ( int i = 0; i < 256; i++ ) { free( h->pps_table[i] ); }
free(h->aud);
if(h->seis != NULL)
{
for( int i = 0; i < h->num_seis; i++ )
{
sei_t* sei = h->seis[i];
sei_free(sei);
}
free(h->seis);
}
free(h->sh);
free(h);
}
/**
Find the beginning and end of a NAL (Network Abstraction Layer) unit in a byte buffer containing H264 bitstream data.
@param[in] buf the buffer
@param[in] size the size of the buffer
@param[out] nal_start the beginning offset of the nal
@param[out] nal_end the end offset of the nal
@return the length of the nal, or 0 if did not find start of nal, or -1 if did not find end of nal
*/
// DEPRECATED - this will be replaced by a similar function with a slightly different API
int find_nal_unit(uint8_t* buf, int size, int* nal_start, int* nal_end)
{
int i;
// find start
*nal_start = 0;
*nal_end = 0;
i = 0;
while ( //( next_bits( 24 ) != 0x000001 && next_bits( 32 ) != 0x00000001 )
(buf[i] != 0 || buf[i+1] != 0 || buf[i+2] != 0x01) &&
(buf[i] != 0 || buf[i+1] != 0 || buf[i+2] != 0 || buf[i+3] != 0x01)
)
{
i++; // skip leading zero
if (i+4 >= size) { return 0; } // did not find nal start
}
if (buf[i] != 0 || buf[i+1] != 0 || buf[i+2] != 0x01) // ( next_bits( 24 ) != 0x000001 )
{
i++;
}
if (buf[i] != 0 || buf[i+1] != 0 || buf[i+2] != 0x01) { /* error, should never happen */ return 0; }
i+= 3;
*nal_start = i;
while ( //( next_bits( 24 ) != 0x000000 && next_bits( 24 ) != 0x000001 )
(buf[i] != 0 || buf[i+1] != 0 || buf[i+2] != 0) &&
(buf[i] != 0 || buf[i+1] != 0 || buf[i+2] != 0x01)
)
{
i++;
// FIXME the next line fails when reading a nal that ends exactly at the end of the data
if (i+3 >= size) { *nal_end = size; return -1; } // did not find nal end, stream ended first
}
*nal_end = i;
return (*nal_end - *nal_start);
}
int more_rbsp_data(h264_stream_t* h, bs_t* b)
{
if ( bs_eof(b) ) { return 0; }
if ( bs_peek_u1(b) == 1 ) { return 0; } // if next bit is 1, we've reached the stop bit
return 1;
}
/**
Convert RBSP data to NAL data (Annex B format).
The size of nal_buf must be 4/3 * the size of the rbsp_buf (rounded up) to guarantee the output will fit.
If that is not true, output may be truncated and an error will be returned.
If that is true, there is no possible error during this conversion.
@param[in] rbsp_buf the rbsp data
@param[in] rbsp_size pointer to the size of the rbsp data
@param[in,out] nal_buf allocated memory in which to put the nal data
@param[in,out] nal_size as input, pointer to the maximum size of the nal data; as output, filled in with the actual size of the nal data
@return actual size of nal data, or -1 on error
*/
// 7.3.1 NAL unit syntax
// 7.4.1.1 Encapsulation of an SODB within an RBSP
int rbsp_to_nal(const uint8_t* rbsp_buf, const int* rbsp_size, uint8_t* nal_buf, int* nal_size)
{
int i;
int j = 1;
int count = 0;
if (*nal_size > 0) { nal_buf[0] = 0x00; } // zero out first byte since we start writing from second byte
for ( i = 0; i < *rbsp_size ; i++ )
{
if ( j >= *nal_size )
{
// error, not enough space
return -1;
}
if ( ( count == 2 ) && !(rbsp_buf[i] & 0xFC) ) // HACK 0xFC
{
nal_buf[j] = 0x03;
j++;
count = 0;
}
nal_buf[j] = rbsp_buf[i];
if ( rbsp_buf[i] == 0x00 )
{
count++;
}
else
{
count = 0;
}
j++;
}
*nal_size = j;
return j;
}
/**
Convert NAL data (Annex B format) to RBSP data.
The size of rbsp_buf must be the same as size of the nal_buf to guarantee the output will fit.
If that is not true, output may be truncated and an error will be returned.
Additionally, certain byte sequences in the input nal_buf are not allowed in the spec and also cause the conversion to fail and an error to be returned.
@param[in] nal_buf the nal data
@param[in,out] nal_size as input, pointer to the size of the nal data; as output, filled in with the actual size of the nal data
@param[in,out] rbsp_buf allocated memory in which to put the rbsp data
@param[in,out] rbsp_size as input, pointer to the maximum size of the rbsp data; as output, filled in with the actual size of rbsp data
@return actual size of rbsp data, or -1 on error
*/
// 7.3.1 NAL unit syntax
// 7.4.1.1 Encapsulation of an SODB within an RBSP
int nal_to_rbsp(const uint8_t* nal_buf, int* nal_size, uint8_t* rbsp_buf, int* rbsp_size)
{
int i;
int j = 0;
int count = 0;
for( i = 1; i < *nal_size; i++ )
{
// in NAL unit, 0x000000, 0x000001 or 0x000002 shall not occur at any byte-aligned position
if( ( count == 2 ) && ( nal_buf[i] < 0x03) )
{
return -1;
}
if( ( count == 2 ) && ( nal_buf[i] == 0x03) )
{
// check the 4th byte after 0x000003, except when cabac_zero_word is used, in which case the last three bytes of this NAL unit must be 0x000003
if((i < *nal_size - 1) && (nal_buf[i+1] > 0x03))
{
return -1;
}
// if cabac_zero_word is used, the final byte of this NAL unit(0x03) is discarded, and the last two bytes of RBSP must be 0x0000
if(i == *nal_size - 1)
{
break;
}
i++;
count = 0;
}
if ( j >= *rbsp_size )
{
// error, not enough space
return -1;
}
rbsp_buf[j] = nal_buf[i];
if(nal_buf[i] == 0x00)
{
count++;
}
else
{
count = 0;
}
j++;
}
*nal_size = i;
*rbsp_size = j;
return j;
}
/**
Read a NAL unit from a byte buffer.
The buffer must start exactly at the beginning of the nal (after the start prefix).
The NAL is read into h->nal and into other fields within h depending on its type (check h->nal->nal_unit_type after reading).
@param[in,out] h the stream object
@param[in] buf the buffer
@param[in] size the size of the buffer
@return the length of data actually read, or -1 on error
*/
//7.3.1 NAL unit syntax
int read_nal_unit(h264_stream_t* h, uint8_t* buf, int size)
{
nal_t* nal = h->nal;
bs_t* b = bs_new(buf, size);
nal->forbidden_zero_bit = bs_read_f(b,1);
nal->nal_ref_idc = bs_read_u(b,2);
nal->nal_unit_type = bs_read_u(b,5);
nal->parsed = NULL;
nal->sizeof_parsed = 0;
bs_free(b);
int nal_size = size;
int rbsp_size = size;
uint8_t* rbsp_buf = (uint8_t*)malloc(rbsp_size);
int rc = nal_to_rbsp(buf, &nal_size, rbsp_buf, &rbsp_size);
if (rc < 0) { free(rbsp_buf); return -1; } // handle conversion error
b = bs_new(rbsp_buf, rbsp_size);
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);
nal->parsed = h->sh;
nal->sizeof_parsed = sizeof(slice_header_t);
break;
case NAL_UNIT_TYPE_SEI:
read_sei_rbsp(h, b);
nal->parsed = h->sei;
nal->sizeof_parsed = sizeof(sei_t);
break;
case NAL_UNIT_TYPE_SPS:
read_seq_parameter_set_rbsp(h, b);
nal->parsed = h->sps;
nal->sizeof_parsed = sizeof(sps_t);
break;
case NAL_UNIT_TYPE_PPS:
read_pic_parameter_set_rbsp(h, b);
nal->parsed = h->pps;
nal->sizeof_parsed = sizeof(pps_t);
break;
case NAL_UNIT_TYPE_AUD:
read_access_unit_delimiter_rbsp(h, b);
nal->parsed = h->aud;
nal->sizeof_parsed = sizeof(aud_t);
break;
case NAL_UNIT_TYPE_END_OF_SEQUENCE:
read_end_of_seq_rbsp(h, b);
break;
case NAL_UNIT_TYPE_END_OF_STREAM:
read_end_of_stream_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:
// here comes the reserved/unspecified/ignored stuff
nal->parsed = NULL;
nal->sizeof_parsed = 0;
return 0;
}
if (bs_overrun(b)) { bs_free(b); free(rbsp_buf); return -1; }
bs_free(b);
free(rbsp_buf);
return nal_size;
}
/**
Read only the NAL headers (enough to determine unit type) from a byte buffer.
@return unit type if read successfully, or -1 if this doesn't look like a nal
*/
int peek_nal_unit(h264_stream_t* h, uint8_t* buf, int size)
{
nal_t* nal = h->nal;
bs_t* b = bs_new(buf, size);
nal->forbidden_zero_bit = bs_read_f(b,1);
nal->nal_ref_idc = bs_read_u(b,2);
nal->nal_unit_type = bs_read_u(b,5);
bs_free(b);
// basic verification, per 7.4.1
if ( nal->forbidden_zero_bit ) { return -1; }
if ( nal->nal_unit_type <= 0 || nal->nal_unit_type > 20 ) { return -1; }
if ( nal->nal_unit_type > 15 && nal->nal_unit_type < 19 ) { return -1; }
if ( nal->nal_ref_idc == 0 )
{
if ( nal->nal_unit_type == NAL_UNIT_TYPE_CODED_SLICE_IDR )
{
return -1;
}
}
else
{
if ( nal->nal_unit_type == NAL_UNIT_TYPE_SEI ||
nal->nal_unit_type == NAL_UNIT_TYPE_AUD ||
nal->nal_unit_type == NAL_UNIT_TYPE_END_OF_SEQUENCE ||
nal->nal_unit_type == NAL_UNIT_TYPE_END_OF_STREAM ||
nal->nal_unit_type == NAL_UNIT_TYPE_FILLER )
{
return -1;
}
}
return nal->nal_unit_type;
}
//7.3.2.1 Sequence parameter set RBSP syntax
void read_seq_parameter_set_rbsp(h264_stream_t* h, bs_t* b)
{
int i;
// NOTE can't read directly into sps because seq_parameter_set_id not yet known and so sps is not selected
int profile_idc = bs_read_u8(b);
int constraint_set0_flag = bs_read_u1(b);
int constraint_set1_flag = bs_read_u1(b);
int constraint_set2_flag = bs_read_u1(b);
int constraint_set3_flag = bs_read_u1(b);
int constraint_set4_flag = bs_read_u1(b);
int constraint_set5_flag = bs_read_u1(b);
int reserved_zero_2bits = bs_read_u(b,2); /* all 0's */
int level_idc = bs_read_u8(b);
int seq_parameter_set_id = bs_read_ue(b);
// select the correct sps
h->sps = h->sps_table[seq_parameter_set_id];
sps_t* sps = h->sps;
memset(sps, 0, sizeof(sps_t));
sps->chroma_format_idc = 1;
sps->profile_idc = profile_idc; // bs_read_u8(b);
sps->constraint_set0_flag = constraint_set0_flag;//bs_read_u1(b);
sps->constraint_set1_flag = constraint_set1_flag;//bs_read_u1(b);
sps->constraint_set2_flag = constraint_set2_flag;//bs_read_u1(b);
sps->constraint_set3_flag = constraint_set3_flag;//bs_read_u1(b);
sps->constraint_set4_flag = constraint_set4_flag;//bs_read_u1(b);
sps->constraint_set5_flag = constraint_set5_flag;//bs_read_u1(b);
sps->reserved_zero_2bits = reserved_zero_2bits;//bs_read_u(b,2);
sps->level_idc = level_idc; //bs_read_u8(b);
sps->seq_parameter_set_id = seq_parameter_set_id; // bs_read_ue(b);
if( sps->profile_idc == 100 || sps->profile_idc == 110 ||
sps->profile_idc == 122 || sps->profile_idc == 144 )
{
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 < 8; 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(h, b);
}
read_rbsp_trailing_bits(h, b);
}
//7.3.2.1.1 Scaling list syntax
void read_scaling_list(bs_t* b, int* scalingList, int sizeOfScalingList, int useDefaultScalingMatrixFlag )
{
int j;
if(scalingList == NULL)
{
return;
}
int lastScale = 8;
int nextScale = 8;
for( j = 0; j < sizeOfScalingList; j++ )
{
if( nextScale != 0 )
{
int delta_scale = bs_read_se(b);
nextScale = ( lastScale + delta_scale + 256 ) % 256;
useDefaultScalingMatrixFlag = ( j == 0 && nextScale == 0 );
}
scalingList[ j ] = ( nextScale == 0 ) ? lastScale : nextScale;
lastScale = scalingList[ j ];
}
}
//Appendix E.1.1 VUI parameters syntax
void read_vui_parameters(h264_stream_t* h, bs_t* b)
{
sps_t* sps = h->sps;
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(h, b);
}
sps->vui.vcl_hrd_parameters_present_flag = bs_read_u1(b);
if( sps->vui.vcl_hrd_parameters_present_flag )
{
read_hrd_parameters(h, 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(h264_stream_t* h, bs_t* b)
{
sps_t* sps = h->sps;
int SchedSelIdx;
sps->hrd.cpb_cnt_minus1 = bs_read_ue(b);
sps->hrd.bit_rate_scale = bs_read_u(b,4);
sps->hrd.cpb_size_scale = bs_read_u(b,4);
for( SchedSelIdx = 0; SchedSelIdx <= sps->hrd.cpb_cnt_minus1; SchedSelIdx++ )
{
sps->hrd.bit_rate_value_minus1[ SchedSelIdx ] = bs_read_ue(b);
sps->hrd.cpb_size_value_minus1[ SchedSelIdx ] = bs_read_ue(b);
sps->hrd.cbr_flag[ SchedSelIdx ] = bs_read_u1(b);
}
sps->hrd.initial_cpb_removal_delay_length_minus1 = bs_read_u(b,5);
sps->hrd.cpb_removal_delay_length_minus1 = bs_read_u(b,5);
sps->hrd.dpb_output_delay_length_minus1 = bs_read_u(b,5);
sps->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)
{
int pps_id = bs_read_ue(b);
pps_t* pps = h->pps = h->pps_table[pps_id] ;
memset(pps, 0, sizeof(pps_t));
int i;
int i_group;
pps->pic_parameter_set_id = pps_id;
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( 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( 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( i = 0; i <= pps->pic_size_in_map_units_minus1; i++ )
{
pps->slice_group_id[ i ] = bs_read_u(b, intlog2( pps->num_slice_groups_minus1 + 1 ) ); // was u(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);
pps->_more_rbsp_data_present = more_rbsp_data(h, b);
if( pps->_more_rbsp_data_present )
{
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( 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);
}
read_rbsp_trailing_bits(h, b);
}
//7.3.2.3 Supplemental enhancement information RBSP syntax
void read_sei_rbsp(h264_stream_t* h, bs_t* b)
{
int i;
for (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(h, b) );
read_rbsp_trailing_bits(h, 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;
}
//7.3.2.3.1 Supplemental enhancement information message syntax
void read_sei_message(h264_stream_t* h, bs_t* b)
{
h->sei->payloadType = _read_ff_coded_number(b);
h->sei->payloadSize = _read_ff_coded_number(b);
read_sei_payload( h, b, h->sei->payloadType, h->sei->payloadSize );
}
//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);
read_rbsp_trailing_bits(h, b);
}
//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 )
{
int ff_byte = bs_read_f(b,8); // equal to 0xFF
}
read_rbsp_trailing_bits(h, b);
}
//7.3.2.8 Slice layer without partitioning RBSP syntax
void read_slice_layer_rbsp(h264_stream_t* h, bs_t* b)
{
read_slice_header(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
}
*/
int
more_rbsp_trailing_data(h264_stream_t* h, bs_t* b) { return !bs_eof(b); }
//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(h, b);
int cabac_zero_word;
if( h->pps->entropy_coding_mode_flag )
{
while( more_rbsp_trailing_data(h, b) )
{
cabac_zero_word = bs_read_f(b,16); // equal to 0x0000
}
}
}
//7.3.2.11 RBSP trailing bits syntax
void read_rbsp_trailing_bits(h264_stream_t* h, bs_t* b)
{
int rbsp_stop_one_bit = bs_read_u1( b ); // equal to 1
while( !bs_byte_aligned(b) )
{
int rbsp_alignment_zero_bit = bs_read_u1( b ); // equal to 0
}
}
//7.3.3 Slice header syntax
void read_slice_header(h264_stream_t* h, bs_t* b)
{
slice_header_t* sh = h->sh;
memset(sh, 0, sizeof(slice_header_t));
sps_t* sps = NULL; // h->sps;
pps_t* pps = NULL;//h->pps;
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);
pps = h->pps = h->pps_table[sh->pic_parameter_set_id];
sps = h->sps = h->sps_table[pps->seq_parameter_set_id];
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 )
{
sh->pic_order_cnt_lsb = bs_read_u(b, sps->log2_max_pic_order_cnt_lsb_minus4 + 4 ); // was u(v)
if( pps->pic_order_present_flag && !sh->field_pic_flag )
{
sh->delta_pic_order_cnt_bottom = bs_read_se(b);
}
}
if( sps->pic_order_cnt_type == 1 && !sps->delta_pic_order_always_zero_flag )
{
sh->delta_pic_order_cnt[ 0 ] = bs_read_se(b);
if( pps->pic_order_present_flag && !sh->field_pic_flag )
{
sh->delta_pic_order_cnt[ 1 ] = bs_read_se(b);
}
}
if( pps->redundant_pic_cnt_present_flag )
{
sh->redundant_pic_cnt = bs_read_ue(b);
}
if( is_slice_type( sh->slice_type, SH_SLICE_TYPE_B ) )
{
sh->direct_spatial_mv_pred_flag = bs_read_u1(b);
}
if( is_slice_type( sh->slice_type, SH_SLICE_TYPE_P ) || is_slice_type( sh->slice_type, SH_SLICE_TYPE_SP ) || is_slice_type( sh->slice_type, SH_SLICE_TYPE_B ) )
{
sh->num_ref_idx_active_override_flag = bs_read_u1(b);
if( sh->num_ref_idx_active_override_flag )
{
sh->num_ref_idx_l0_active_minus1 = bs_read_ue(b); // FIXME does this modify the pps?
if( is_slice_type( sh->slice_type, SH_SLICE_TYPE_B ) )
{
sh->num_ref_idx_l1_active_minus1 = bs_read_ue(b);
}
}
}
read_ref_pic_list_reordering(h, b);
if( ( pps->weighted_pred_flag && ( is_slice_type( sh->slice_type, SH_SLICE_TYPE_P ) || is_slice_type( sh->slice_type, SH_SLICE_TYPE_SP ) ) ) ||
( pps->weighted_bipred_idc == 1 && is_slice_type( sh->slice_type, SH_SLICE_TYPE_B ) ) )
{
read_pred_weight_table(h, b);
}
if( nal->nal_ref_idc != 0 )
{
read_dec_ref_pic_marking(h, b);
}
if( pps->entropy_coding_mode_flag && ! is_slice_type( sh->slice_type, SH_SLICE_TYPE_I ) && ! is_slice_type( sh->slice_type, SH_SLICE_TYPE_SI ) )
{
sh->cabac_init_idc = bs_read_ue(b);
}
sh->slice_qp_delta = bs_read_se(b);
if( is_slice_type( sh->slice_type, SH_SLICE_TYPE_SP ) || is_slice_type( sh->slice_type, SH_SLICE_TYPE_SI ) )
{
if( is_slice_type( sh->slice_type, SH_SLICE_TYPE_SP ) )