hevc_nal.c 40.8 KB
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/*****************************************************************************
 * Copyright © 2010-2014 VideoLAN
 *
 * Authors: Thomas Guillem <thomas.guillem@gmail.com>
 *
 * This program 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 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/
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#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
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#include "hevc_nal.h"
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#include "hxxx_nal.h"
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#include <vlc_common.h>
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#include <vlc_bits.h>

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#include <limits.h>

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typedef uint8_t  nal_u1_t;
typedef uint8_t  nal_u2_t;
typedef uint8_t  nal_u3_t;
typedef uint8_t  nal_u4_t;
typedef uint8_t  nal_u5_t;
typedef uint8_t  nal_u6_t;
typedef uint8_t  nal_u7_t;
typedef uint8_t  nal_u8_t;
typedef int32_t  nal_se_t;
typedef uint32_t nal_ue_t;

typedef struct
{
    nal_u2_t profile_space;
    nal_u1_t tier_flag;
    nal_u5_t profile_idc;
    uint32_t profile_compatibility_flag; /* nal_u1_t * 32 */
    nal_u1_t progressive_source_flag;
    nal_u1_t interlaced_source_flag;
    nal_u1_t non_packed_constraint_flag;
    nal_u1_t frame_only_constraint_flag;
    struct
    {
        nal_u1_t max_12bit_constraint_flag;
        nal_u1_t max_10bit_constraint_flag;
        nal_u1_t max_8bit_constraint_flag;
        nal_u1_t max_422chroma_constraint_flag;
        nal_u1_t max_420chroma_constraint_flag;
        nal_u1_t max_monochrome_constraint_flag;
        nal_u1_t intra_constraint_flag;
        nal_u1_t one_picture_only_constraint_flag;
        nal_u1_t lower_bit_rate_constraint_flag;
    } idc4to7;
    struct
    {
        nal_u1_t inbld_flag;
    } idc1to5;
} hevc_inner_profile_tier_level_t;

#define HEVC_MAX_SUBLAYERS 8
typedef struct
{
    hevc_inner_profile_tier_level_t general;
    nal_u8_t general_level_idc;
    uint8_t  sublayer_profile_present_flag;  /* nal_u1_t * 8 */
    uint8_t  sublayer_level_present_flag;    /* nal_u1_t * 8 */
    hevc_inner_profile_tier_level_t sub_layer[HEVC_MAX_SUBLAYERS];
    nal_u8_t sub_layer_level_idc[HEVC_MAX_SUBLAYERS];
} hevc_profile_tier_level_t;

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#define HEVC_MAX_SHORT_TERM_REF_PIC_SET 65
#define HEVC_MAX_LONG_TERM_REF_PIC_SET 33

typedef struct
{
    unsigned num_delta_pocs;
} hevc_short_term_ref_pic_set_t;

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typedef struct
{
    nal_u1_t aspect_ratio_info_present_flag;
    struct
    {
        nal_u8_t aspect_ratio_idc;
        uint16_t sar_width;
        uint16_t sar_height;
    } ar;
    nal_u1_t overscan_info_present_flag;
    nal_u1_t overscan_appropriate_flag;

    nal_u1_t video_signal_type_present_flag;
    struct
    {
        nal_u3_t video_format;
        nal_u1_t video_full_range_flag;
        nal_u1_t colour_description_present_flag;
        struct
        {
            nal_u8_t colour_primaries;
            nal_u8_t transfer_characteristics;
            nal_u8_t matrix_coeffs;
        } colour;
    } vs;

    nal_u1_t chroma_loc_info_present_flag;
    struct
    {
        nal_ue_t sample_loc_type_top_field;
        nal_ue_t sample_loc_type_bottom_field;
    } chroma;

    nal_u1_t neutral_chroma_indication_flag;
    nal_u1_t field_seq_flag;
    nal_u1_t frame_field_info_present_flag;

    nal_u1_t default_display_window_flag;
    struct
    {
        nal_ue_t win_left_offset;
        nal_ue_t win_right_offset;
        nal_ue_t win_top_offset;
        nal_ue_t win_bottom_offset;
    } def_disp;

    nal_u1_t vui_timing_info_present_flag;
    struct
    {
        uint32_t vui_num_units_in_tick;
        uint32_t vui_time_scale;
        /* incomplete */
    } timing;

    /* incomplete */
} hevc_vui_parameters_t;

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struct hevc_video_parameter_set_t
{
    nal_u4_t vps_video_parameter_set_id;
    nal_u1_t vps_base_layer_internal_flag;
    nal_u1_t vps_base_layer_available_flag;
    nal_u6_t vps_max_layers_minus1;
    nal_u3_t vps_max_sub_layers_minus1;
    nal_u1_t vps_temporal_id_nesting_flag;

    hevc_profile_tier_level_t profile_tier_level;

    nal_u1_t vps_sub_layer_ordering_info_present_flag;
    struct
    {
        nal_ue_t dec_pic_buffering_minus1;
        nal_ue_t num_reorder_pics;
        nal_ue_t max_latency_increase_plus1;
    } vps_max[1 + HEVC_MAX_SUBLAYERS];

    nal_u6_t vps_max_layer_id;
    nal_ue_t vps_num_layer_set_minus1;
    // layer_id_included_flag; read but discarded

    nal_u1_t vps_timing_info_present_flag;
    uint32_t vps_num_units_in_tick;
    uint32_t vps_time_scale;

    /* incomplete */
};

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struct hevc_sequence_parameter_set_t
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{
    nal_u4_t sps_video_parameter_set_id;
    nal_u3_t sps_max_sub_layers_minus1;
    nal_u1_t sps_temporal_id_nesting_flag;

    hevc_profile_tier_level_t profile_tier_level;

    nal_ue_t sps_seq_parameter_set_id;
    nal_ue_t chroma_format_idc;
    nal_u1_t separate_colour_plane_flag;

    nal_ue_t pic_width_in_luma_samples;
    nal_ue_t pic_height_in_luma_samples;

    nal_u1_t conformance_window_flag;
    struct
    {
    nal_ue_t left_offset;
    nal_ue_t right_offset;
    nal_ue_t top_offset;
    nal_ue_t bottom_offset;
    } conf_win;

    nal_ue_t bit_depth_luma_minus8;
    nal_ue_t bit_depth_chroma_minus8;
    nal_ue_t log2_max_pic_order_cnt_lsb_minus4;

    nal_u1_t sps_sub_layer_ordering_info_present_flag;
    struct
    {
    nal_ue_t dec_pic_buffering_minus1;
    nal_ue_t num_reorder_pics;
    nal_ue_t latency_increase_plus1;
    } sps_max[1 + HEVC_MAX_SUBLAYERS];

    nal_ue_t log2_min_luma_coding_block_size_minus3;
    nal_ue_t log2_diff_max_min_luma_coding_block_size;
    nal_ue_t log2_min_luma_transform_block_size_minus2;
    nal_ue_t log2_diff_max_min_luma_transform_block_size;

    /* incomplete */
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    nal_ue_t max_transform_hierarchy_depth_inter;
    nal_ue_t max_transform_hierarchy_depth_intra;
    nal_u1_t scaling_list_enabled;
    nal_u1_t sps_scaling_list_data_present_flag;
    // scaling_list_data; read but discarded

    nal_u1_t amp_enabled_flag;
    nal_u1_t sample_adaptive_offset_enabled_flag;

    nal_u1_t pcm_enabled_flag;
    nal_u4_t pcm_sample_bit_depth_luma_minus1;
    nal_u4_t pcm_sample_bit_depth_chroma_minus1;
    nal_ue_t log2_min_pcm_luma_coding_block_size_minus3;
    nal_ue_t log2_diff_max_min_pcm_luma_coding_block_size;
    nal_u1_t pcm_loop_filter_disabled_flag;

    nal_ue_t num_short_term_ref_pic_sets;
    // st_ref_pic_set

    nal_u1_t long_term_ref_pics_present_flag;
    nal_ue_t num_long_term_ref_pics_sps;
    //

    nal_u1_t sps_temporal_mvp_enabled_flag;
    nal_u1_t strong_intra_smoothing_enabled_flag;

    nal_u1_t vui_parameters_present_flag;
    hevc_vui_parameters_t vui;
    /* incomplete */
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};
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struct hevc_picture_parameter_set_t
{
    nal_ue_t pps_pic_parameter_set_id;
    nal_ue_t pps_seq_parameter_set_id;
    nal_u1_t dependent_slice_segments_enabled_flag;
    nal_u1_t output_flag_present_flag;
    nal_u3_t num_extra_slice_header_bits;
    nal_u1_t sign_data_hiding_enabled_flag;
    nal_u1_t cabac_init_present_flag;
    nal_ue_t num_ref_idx_l0_default_active_minus1;
    nal_ue_t num_ref_idx_l1_default_active_minus1;
    nal_se_t init_qp_minus26;
    nal_u1_t constrained_intra_pred_flag;
    nal_u1_t transform_skip_enabled_flag;

    nal_u1_t cu_qp_delta_enabled_flag;
    nal_ue_t diff_cu_qp_delta_depth;

    nal_se_t pps_cb_qp_offset;
    nal_se_t pps_cr_qp_offset;
    nal_u1_t pic_slice_level_chroma_qp_offsets_present_flag;
    nal_u1_t weighted_pred_flag;
    nal_u1_t weighted_bipred_flag;
    nal_u1_t transquant_bypass_enable_flag;

    nal_u1_t tiles_enabled_flag;
    nal_u1_t entropy_coding_sync_enabled_flag;
    nal_ue_t num_tile_columns_minus1;
    nal_ue_t num_tile_rows_minus1;
    nal_u1_t uniform_spacing_flag;
    // nal_ue_t *p_column_width_minus1; read but discarded
    // nal_ue_t *p_row_height_minus1; read but discarded
    nal_u1_t loop_filter_across_tiles_enabled_flag;

    nal_u1_t pps_loop_filter_across_slices_enabled_flag;

    nal_u1_t deblocking_filter_control_present_flag;
    nal_u1_t deblocking_filter_override_enabled_flag;
    nal_u1_t pps_deblocking_filter_disabled_flag;
    nal_se_t pps_beta_offset_div2;
    nal_se_t pps_tc_offset_div2;

    nal_u1_t scaling_list_data_present_flag;
    // scaling_list_data; read but discarded

    nal_u1_t lists_modification_present_flag;
    nal_ue_t log2_parallel_merge_level_minus2;
    nal_u1_t slice_header_extension_present_flag;

    nal_u1_t pps_extension_present_flag;
    nal_u1_t pps_range_extension_flag;
    nal_u1_t pps_multilayer_extension_flag;
    nal_u1_t pps_3d_extension_flag;
    nal_u5_t pps_extension_5bits;
    /* incomplete */

};

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struct hevc_slice_segment_header_t
{
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    nal_u6_t nal_type;
    nal_u6_t nuh_layer_id;
    nal_u3_t temporal_id;
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    nal_u1_t first_slice_segment_in_pic_flag;
    nal_u1_t no_output_of_prior_pics_flag;
    nal_ue_t slice_pic_parameter_set_id;
    nal_u1_t dependent_slice_segment_flag;
    // slice_segment_address; read but discarded
    nal_ue_t slice_type;
    nal_u1_t pic_output_flag;
    /* incomplete */

};

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/* Computes size and does check the whole struct integrity */
static size_t get_hvcC_to_AnnexB_NAL_size( const uint8_t *p_buf, size_t i_buf )
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{
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    size_t i_total = 0;
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    if( i_buf < HEVC_MIN_HVCC_SIZE )
        return 0;
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    const uint8_t i_nal_length_size = (p_buf[21] & 0x03) + 1;
    if(i_nal_length_size == 3)
        return 0;

    const uint8_t i_num_array = p_buf[22];
    p_buf += 23; i_buf -= 23;

    for( uint8_t i = 0; i < i_num_array; i++ )
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    {
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        if(i_buf < 3)
            return 0;

        const uint16_t i_num_nalu = p_buf[1] << 8 | p_buf[2];
        p_buf += 3; i_buf -= 3;

        for( uint16_t j = 0; j < i_num_nalu; j++ )
        {
            if(i_buf < 2)
                return 0;

            const uint16_t i_nalu_length = p_buf[0] << 8 | p_buf[1];
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            if(i_buf < i_nalu_length + 2)
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                return 0;

            i_total += i_nalu_length + i_nal_length_size;
            p_buf += i_nalu_length + 2;
            i_buf -= i_nalu_length + 2;
        }
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    }

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    return i_total;
}

uint8_t * hevc_hvcC_to_AnnexB_NAL( const uint8_t *p_buf, size_t i_buf,
                                   size_t *pi_result, uint8_t *pi_nal_length_size )
{
    *pi_result = get_hvcC_to_AnnexB_NAL_size( p_buf, i_buf ); /* Does all checks */
    if( *pi_result == 0 )
        return NULL;

    if( pi_nal_length_size )
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        *pi_nal_length_size = hevc_getNALLengthSize( p_buf );
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    uint8_t *p_ret;
    uint8_t *p_out_buf = p_ret = malloc( *pi_result );
    if( !p_out_buf )
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    {
        *pi_result = 0;
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        return NULL;
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    }
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    const uint8_t i_num_array = p_buf[22];
    p_buf += 23;
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    for( uint8_t i = 0; i < i_num_array; i++ )
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    {
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        const uint16_t i_num_nalu = p_buf[1] << 8 | p_buf[2];
        p_buf += 3;
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        for( uint16_t j = 0; j < i_num_nalu; j++ )
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        {
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            const uint16_t i_nalu_length = p_buf[0] << 8 | p_buf[1];
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            memcpy( p_out_buf, annexb_startcode4, 4 );
            memcpy( &p_out_buf[4], &p_buf[2], i_nalu_length );
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            p_out_buf += 4 + i_nalu_length;
            p_buf += 2 + i_nalu_length;
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        }
    }

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    return p_ret;
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}
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static bool hevc_parse_scaling_list_rbsp( bs_t *p_bs )
{
    if( bs_remain( p_bs ) < 16 )
        return false;

    for( int i=0; i<4; i++ )
    {
        for( int j=0; j<6; j += (i == 3) ? 3 : 1 )
        {
            if( bs_read1( p_bs ) == 0 )
                bs_read_ue( p_bs );
            else
            {
                unsigned nextCoef = 8;
                unsigned coefNum = __MIN( 64, (1 << (4 + (i << 1))));
                if( i > 1 )
                {
                    nextCoef = bs_read_se( p_bs ) + 8;
                }
                for( unsigned k=0; k<coefNum; k++ )
                {
                    nextCoef = ( nextCoef + bs_read_se( p_bs ) + 256 ) % 256;
                }
            }
        }
    }

    return true;
}

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static bool hevc_parse_vui_parameters_rbsp( bs_t *p_bs, hevc_vui_parameters_t *p_vui )
{
    if( bs_remain( p_bs ) < 10 )
        return false;

    p_vui->aspect_ratio_info_present_flag = bs_read1( p_bs );
    if( p_vui->aspect_ratio_info_present_flag )
    {
        p_vui->ar.aspect_ratio_idc = bs_read( p_bs, 8 );
        if( p_vui->ar.aspect_ratio_idc == 0xFF ) //HEVC_SAR__IDC_EXTENDED_SAR )
        {
            p_vui->ar.sar_width = bs_read( p_bs, 16 );
            p_vui->ar.sar_height = bs_read( p_bs, 16 );
        }
    }

    p_vui->overscan_info_present_flag = bs_read1( p_bs );
    if( p_vui->overscan_info_present_flag )
        p_vui->overscan_appropriate_flag = bs_read1( p_bs );

    p_vui->video_signal_type_present_flag = bs_read1( p_bs );
    if( p_vui->video_signal_type_present_flag )
    {
        p_vui->vs.video_format = bs_read( p_bs, 3 );
        p_vui->vs.video_full_range_flag = bs_read1( p_bs );
        p_vui->vs.colour_description_present_flag = bs_read1( p_bs );
        if( p_vui->vs.colour_description_present_flag )
        {
            p_vui->vs.colour.colour_primaries = bs_read( p_bs, 8 );
            p_vui->vs.colour.transfer_characteristics = bs_read( p_bs, 8 );
            p_vui->vs.colour.matrix_coeffs = bs_read( p_bs, 8 );
        }
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        else
        {
            p_vui->vs.colour.colour_primaries = HXXX_PRIMARIES_UNSPECIFIED;
            p_vui->vs.colour.transfer_characteristics = HXXX_TRANSFER_UNSPECIFIED;
            p_vui->vs.colour.matrix_coeffs = HXXX_MATRIX_UNSPECIFIED;
        }
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    }

    p_vui->chroma_loc_info_present_flag = bs_read1( p_bs );
    if( p_vui->chroma_loc_info_present_flag )
    {
        p_vui->chroma.sample_loc_type_top_field = bs_read_ue( p_bs );
        p_vui->chroma.sample_loc_type_bottom_field = bs_read_ue( p_bs );
    }

    p_vui->neutral_chroma_indication_flag = bs_read1( p_bs );
    p_vui->field_seq_flag = bs_read1( p_bs );
    p_vui->frame_field_info_present_flag = bs_read1( p_bs );

    p_vui->default_display_window_flag = bs_read1( p_bs );
    if( p_vui->default_display_window_flag )
    {
        p_vui->def_disp.win_left_offset = bs_read_ue( p_bs );
        p_vui->def_disp.win_right_offset = bs_read_ue( p_bs );
        p_vui->def_disp.win_top_offset = bs_read_ue( p_bs );
        p_vui->def_disp.win_bottom_offset = bs_read_ue( p_bs );
    }

    p_vui->vui_timing_info_present_flag = bs_read1( p_bs );
    if( p_vui->vui_timing_info_present_flag )
    {
        p_vui->timing.vui_num_units_in_tick =  bs_read( p_bs, 32 );
        p_vui->timing.vui_time_scale =  bs_read( p_bs, 32 );

        if( bs_remain( p_bs ) < 3 )
            return false;
    }
    /* incomplete */

    if( bs_remain( p_bs ) < 1 ) /* late fail */
        return false;

    return true;
}

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/* Shortcut for retrieving vps/sps/pps id */
bool hevc_get_xps_id(const uint8_t *p_buf, size_t i_buf, uint8_t *pi_id)
{
    if(unlikely(!hxxx_strip_AnnexB_startcode(&p_buf, &i_buf) || i_buf < 3))
        return false;
    /* No need to lookup convert from emulation for that data */
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    uint8_t i_nal_type = hevc_getNALType(p_buf);
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    bs_t bs;
    bs_init(&bs, &p_buf[2], i_buf - 2);
    if(i_nal_type == HEVC_NAL_PPS)
        *pi_id = bs_read_ue( &bs );
    else
        *pi_id = bs_read( &bs, 4 );

    return true;
}

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static bool hevc_parse_inner_profile_tier_level_rbsp( bs_t *p_bs,
                                                      hevc_inner_profile_tier_level_t *p_in )
{
    if( bs_remain( p_bs ) < 88 )
        return false;

    p_in->profile_space = bs_read( p_bs, 2 );
    p_in->tier_flag = bs_read1( p_bs );
    p_in->profile_idc = bs_read( p_bs, 5 );
    p_in->profile_compatibility_flag = bs_read( p_bs, 32 );
    p_in->progressive_source_flag = bs_read1( p_bs );
    p_in->interlaced_source_flag = bs_read1( p_bs );
    p_in->non_packed_constraint_flag = bs_read1( p_bs );
    p_in->frame_only_constraint_flag = bs_read1( p_bs );

    if( ( p_in->profile_idc >= 4 && p_in->profile_idc <= 7 ) ||
        ( p_in->profile_compatibility_flag & 0x0F000000 ) )
    {
        p_in->idc4to7.max_12bit_constraint_flag = bs_read1( p_bs );
        p_in->idc4to7.max_10bit_constraint_flag = bs_read1( p_bs );
        p_in->idc4to7.max_8bit_constraint_flag = bs_read1( p_bs );
        p_in->idc4to7.max_422chroma_constraint_flag = bs_read1( p_bs );
        p_in->idc4to7.max_420chroma_constraint_flag = bs_read1( p_bs );
        p_in->idc4to7.max_monochrome_constraint_flag = bs_read1( p_bs );
        p_in->idc4to7.intra_constraint_flag = bs_read1( p_bs );
        p_in->idc4to7.one_picture_only_constraint_flag = bs_read1( p_bs );
        p_in->idc4to7.lower_bit_rate_constraint_flag = bs_read1( p_bs );
        (void) bs_read( p_bs, 2 );
    }
    else
    {
        (void) bs_read( p_bs, 11 );
    }
    (void) bs_read( p_bs, 32 );

    if( ( p_in->profile_idc >= 1 && p_in->profile_idc <= 5 ) ||
        ( p_in->profile_compatibility_flag & 0x7C000000 ) )
        p_in->idc1to5.inbld_flag = bs_read1( p_bs );
    else
        (void) bs_read1( p_bs );

    return true;
}

static bool hevc_parse_profile_tier_level_rbsp( bs_t *p_bs, bool profile_present,
                                                uint8_t max_num_sub_layers_minus1,
                                                hevc_profile_tier_level_t *p_ptl )
{
    if( profile_present && !hevc_parse_inner_profile_tier_level_rbsp( p_bs, &p_ptl->general ) )
        return false;

    if( bs_remain( p_bs ) < 8)
        return false;

    p_ptl->general_level_idc = bs_read( p_bs, 8 );

    if( max_num_sub_layers_minus1 > 0 )
    {
        if( bs_remain( p_bs ) < 16 )
            return false;

        for( uint8_t i=0; i< 8; i++ )
        {
            if( i < max_num_sub_layers_minus1 )
            {
                if( bs_read1( p_bs ) )
                    p_ptl->sublayer_profile_present_flag |= (0x80 >> i);
                if( bs_read1( p_bs ) )
                    p_ptl->sublayer_level_present_flag |= (0x80 >> i);
            }
            else
                bs_read( p_bs, 2 );
        }

        for( uint8_t i=0; i < max_num_sub_layers_minus1; i++ )
        {
            if( ( p_ptl->sublayer_profile_present_flag & (0x80 >> i) ) &&
                ! hevc_parse_inner_profile_tier_level_rbsp( p_bs, &p_ptl->sub_layer[i] ) )
                return false;

            if( p_ptl->sublayer_profile_present_flag & (0x80 >> i) )
            {
                if( bs_remain( p_bs ) < 8 )
                    return false;
                p_ptl->sub_layer_level_idc[i] = bs_read( p_bs, 8 );
            }
        }
    }

    return true;
}
621

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static bool hevc_parse_video_parameter_set_rbsp( bs_t *p_bs,
                                                 hevc_video_parameter_set_t *p_vps )
{
    if( bs_remain( p_bs ) < 134 )
        return false;

    p_vps->vps_video_parameter_set_id = bs_read( p_bs, 4 );
    p_vps->vps_base_layer_internal_flag = bs_read1( p_bs );
    p_vps->vps_base_layer_available_flag = bs_read1( p_bs );
    p_vps->vps_max_layers_minus1 = bs_read( p_bs, 6 );
    p_vps->vps_max_sub_layers_minus1 = bs_read( p_bs, 3 );
    p_vps->vps_temporal_id_nesting_flag = bs_read1( p_bs );
    bs_skip( p_bs, 16 );

    if( !hevc_parse_profile_tier_level_rbsp( p_bs, true, p_vps->vps_max_sub_layers_minus1,
                                            &p_vps->profile_tier_level ) )
        return false;

    p_vps->vps_sub_layer_ordering_info_present_flag = bs_read1( p_bs );
    for( unsigned i= (p_vps->vps_sub_layer_ordering_info_present_flag ?
                      0 : p_vps->vps_max_sub_layers_minus1);
         i<= p_vps->vps_max_sub_layers_minus1; i++ )
    {
        (void) bs_read_ue( p_bs ); //nal_ue_t dec_pic_buffering_minus1;
        (void) bs_read_ue( p_bs ); //nal_ue_t num_reorder_pics;
        (void) bs_read_ue( p_bs ); //nal_ue_t max_latency_increase_plus1;
    }
    if( bs_remain( p_bs ) < 10 )
        return false;

    p_vps->vps_max_layer_id = bs_read( p_bs, 6 );
    p_vps->vps_num_layer_set_minus1 = bs_read_ue( p_bs );
    // layer_id_included_flag; read but discarded
    bs_skip( p_bs, p_vps->vps_num_layer_set_minus1 * (p_vps->vps_max_layer_id + 1) );
    if( bs_remain( p_bs ) < 2 )
        return false;

    p_vps->vps_timing_info_present_flag = bs_read1( p_bs );
    if( p_vps->vps_timing_info_present_flag )
    {
        p_vps->vps_num_units_in_tick = bs_read( p_bs, 32 );
        p_vps->vps_time_scale = bs_read( p_bs, 32 );
    }
    /* parsing incomplete */

    if( bs_remain( p_bs ) < 1 )
        return false;

    return true;
}

void hevc_rbsp_release_vps( hevc_video_parameter_set_t *p_vps )
{
    free( p_vps );
}

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#define IMPL_hevc_generic_decode( name, hevctype, decode, release ) \
    hevctype * name( const uint8_t *p_buf, size_t i_buf, bool b_escaped ) \
    { \
        hevctype *p_hevctype = calloc(1, sizeof(hevctype)); \
        if(likely(p_hevctype)) \
        { \
            bs_t bs; \
            bs_init( &bs, p_buf, i_buf ); \
            unsigned i_bitflow = 0; \
            if( b_escaped ) \
            { \
                bs.p_fwpriv = &i_bitflow; \
                bs.pf_forward = hxxx_bsfw_ep3b_to_rbsp;  /* Does the emulated 3bytes conversion to rbsp */ \
            } \
            else (void) i_bitflow;\
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            bs_skip( &bs, 7 ); /* nal_unit_header */ \
            uint8_t i_nuh_layer_id = bs_read( &bs, 6 ); \
            bs_skip( &bs, 3 ); /* !nal_unit_header */ \
            if( i_nuh_layer_id > 62 || !decode( &bs, p_hevctype ) ) \
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            { \
                release( p_hevctype ); \
                p_hevctype = NULL; \
            } \
        } \
        return p_hevctype; \
703
    }
704 705 706

IMPL_hevc_generic_decode( hevc_decode_vps, hevc_video_parameter_set_t,
                          hevc_parse_video_parameter_set_rbsp, hevc_rbsp_release_vps )
707

708
static bool hevc_parse_st_ref_pic_set( bs_t *p_bs, unsigned stRpsIdx,
709 710 711
                                       unsigned num_short_term_ref_pic_sets,
                                       hevc_short_term_ref_pic_set_t *p_sets )
{
712
    if( stRpsIdx && bs_read1( p_bs ) ) /* Interref pic set prediction flag */
713 714
    {
        nal_ue_t delta_idx_minus_1 = 0;
715
        if( stRpsIdx == num_short_term_ref_pic_sets )
716 717
        {
            delta_idx_minus_1 = bs_read_ue( p_bs );
718
            if( delta_idx_minus_1 >= stRpsIdx )
719 720
                return false;
        }
721
        if(delta_idx_minus_1 == stRpsIdx)
722 723 724 725
            return false;

        nal_u1_t delta_rps_sign = bs_read1( p_bs );
        nal_ue_t abs_delta_rps_minus1 = bs_read_ue( p_bs );
726
        unsigned RefRpsIdx = stRpsIdx - delta_idx_minus_1 - 1;
727 728 729 730
        int deltaRps = ( 1 - ( delta_rps_sign << 1 ) ) * ( abs_delta_rps_minus1 + 1 );
        VLC_UNUSED(deltaRps);

        unsigned numDeltaPocs = p_sets[RefRpsIdx].num_delta_pocs;
731
        p_sets[stRpsIdx].num_delta_pocs = 0;
732 733
        for( unsigned j=0; j<= numDeltaPocs; j++ )
        {
734 735 736 737 738 739 740
            if( ! bs_read1( p_bs ) ) /* used_by_curr_pic_flag */
            {
                if( bs_read1( p_bs ) ) /* use_delta_flag */
                    p_sets[stRpsIdx].num_delta_pocs++;
            }
            else
                p_sets[stRpsIdx].num_delta_pocs++;
741 742 743 744 745 746
        }
    }
    else
    {
        nal_ue_t num_negative_pics = bs_read_ue( p_bs );
        nal_ue_t num_positive_pics = bs_read_ue( p_bs );
747 748
        if( bs_remain( p_bs ) < ((uint64_t)num_negative_pics + num_positive_pics) * 2 )
            return false;
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        for(unsigned int i=0; i<num_negative_pics; i++)
        {
            (void) bs_read_ue( p_bs ); /* delta_poc_s0_minus1 */
            (void) bs_read1( p_bs ); /* used_by_current_pic_s0_flag */
        }
        for(unsigned int i=0; i<num_positive_pics; i++)
        {
            (void) bs_read_ue( p_bs ); /* delta_poc_s1_minus1 */
            (void) bs_read1( p_bs ); /* used_by_current_pic_s1_flag */
        }
759
        p_sets[stRpsIdx].num_delta_pocs = num_positive_pics + num_negative_pics;
760 761 762 763 764
    }

    return true;
}

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static bool hevc_parse_sequence_parameter_set_rbsp( bs_t *p_bs,
                                                    hevc_sequence_parameter_set_t *p_sps )
{
    p_sps->sps_video_parameter_set_id = bs_read( p_bs, 4 );
    p_sps->sps_max_sub_layers_minus1 = bs_read( p_bs, 3 );
    p_sps->sps_temporal_id_nesting_flag = bs_read1( p_bs );
    if( !hevc_parse_profile_tier_level_rbsp( p_bs, true, p_sps->sps_max_sub_layers_minus1,
                                            &p_sps->profile_tier_level ) )
        return false;

    if( bs_remain( p_bs ) < 1 )
        return false;

    p_sps->sps_seq_parameter_set_id = bs_read_ue( p_bs );
779
    if( p_sps->sps_seq_parameter_set_id > HEVC_SPS_ID_MAX )
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        return false;

    p_sps->chroma_format_idc = bs_read_ue( p_bs );
    if( p_sps->chroma_format_idc == 3 )
        p_sps->separate_colour_plane_flag = bs_read1( p_bs );
    p_sps->pic_width_in_luma_samples = bs_read_ue( p_bs );
    p_sps->pic_height_in_luma_samples = bs_read_ue( p_bs );
    if( !p_sps->pic_width_in_luma_samples || !p_sps->pic_height_in_luma_samples )
        return false;

    p_sps->conformance_window_flag = bs_read1( p_bs );
    if( p_sps->conformance_window_flag )
    {
        p_sps->conf_win.left_offset = bs_read_ue( p_bs );
        p_sps->conf_win.right_offset = bs_read_ue( p_bs );
        p_sps->conf_win.top_offset = bs_read_ue( p_bs );
        p_sps->conf_win.bottom_offset = bs_read_ue( p_bs );
    }

    p_sps->bit_depth_luma_minus8 = bs_read_ue( p_bs );
    p_sps->bit_depth_chroma_minus8 = bs_read_ue( p_bs );
    p_sps->log2_max_pic_order_cnt_lsb_minus4 = bs_read_ue( p_bs );

    p_sps->sps_sub_layer_ordering_info_present_flag = bs_read1( p_bs );
    for( uint8_t i=(p_sps->sps_sub_layer_ordering_info_present_flag ? 0 : p_sps->sps_max_sub_layers_minus1);
         i <= p_sps->sps_max_sub_layers_minus1; i++ )
    {
        p_sps->sps_max[i].dec_pic_buffering_minus1 = bs_read_ue( p_bs );
        p_sps->sps_max[i].num_reorder_pics = bs_read_ue( p_bs );
        p_sps->sps_max[i].latency_increase_plus1 = bs_read_ue( p_bs );
    }

    if( bs_remain( p_bs ) < 4 )
        return false;

    p_sps->log2_min_luma_coding_block_size_minus3 = bs_read_ue( p_bs );
    p_sps->log2_diff_max_min_luma_coding_block_size = bs_read_ue( p_bs );
    p_sps->log2_min_luma_transform_block_size_minus2 = bs_read_ue( p_bs );
    if( bs_remain( p_bs ) < 1 ) /* last late fail check */
        return false;
    p_sps->log2_diff_max_min_luma_transform_block_size = bs_read_ue( p_bs );

    /* parsing incomplete */
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    p_sps->max_transform_hierarchy_depth_inter = bs_read_ue( p_bs );
    p_sps->max_transform_hierarchy_depth_intra = bs_read_ue( p_bs );
    p_sps->scaling_list_enabled = bs_read1( p_bs );
    if( p_sps->scaling_list_enabled )
    {
        p_sps->sps_scaling_list_data_present_flag = bs_read1( p_bs );
        if( p_sps->sps_scaling_list_data_present_flag &&
            ! hevc_parse_scaling_list_rbsp( p_bs ) )
        {
            return false;
        }
    }

    p_sps->amp_enabled_flag = bs_read1( p_bs );
    p_sps->sample_adaptive_offset_enabled_flag = bs_read1( p_bs );

    p_sps->pcm_enabled_flag = bs_read1( p_bs );
    if( p_sps->pcm_enabled_flag )
    {
        p_sps->pcm_sample_bit_depth_luma_minus1 = bs_read( p_bs, 4 );
        p_sps->pcm_sample_bit_depth_chroma_minus1 = bs_read( p_bs, 4 );
        p_sps->log2_min_pcm_luma_coding_block_size_minus3 = bs_read_ue( p_bs );
        p_sps->log2_diff_max_min_pcm_luma_coding_block_size = bs_read_ue( p_bs );
        p_sps->pcm_loop_filter_disabled_flag = bs_read1( p_bs );
    }

    p_sps->num_short_term_ref_pic_sets = bs_read_ue( p_bs );
    if( p_sps->num_short_term_ref_pic_sets > HEVC_MAX_SHORT_TERM_REF_PIC_SET )
        return false;

    hevc_short_term_ref_pic_set_t sets[HEVC_MAX_SHORT_TERM_REF_PIC_SET];
    memset(&sets, 0, sizeof(hevc_short_term_ref_pic_set_t) * HEVC_MAX_SHORT_TERM_REF_PIC_SET);
    for( unsigned int i=0; i<p_sps->num_short_term_ref_pic_sets; i++ )
    {
        if( !hevc_parse_st_ref_pic_set( p_bs, i, p_sps->num_short_term_ref_pic_sets, sets ) )
            return false;
    }

    p_sps->long_term_ref_pics_present_flag = bs_read1( p_bs );
    if( p_sps->long_term_ref_pics_present_flag )
    {
        p_sps->num_long_term_ref_pics_sps = bs_read_ue( p_bs );
        if( p_sps->num_long_term_ref_pics_sps > HEVC_MAX_LONG_TERM_REF_PIC_SET )
            return false;
        for( unsigned int i=0; i< p_sps->num_long_term_ref_pics_sps; i++ )
        {
             /* lt_ref_pic_poc_lsb_sps */
            bs_skip( p_bs, p_sps->log2_max_pic_order_cnt_lsb_minus4 + 4 );
             /* used_by_curr_pic_lt_sps_flag */
            bs_skip( p_bs, 1 );
        }
    }

    p_sps->sps_temporal_mvp_enabled_flag = bs_read1( p_bs );
    p_sps->strong_intra_smoothing_enabled_flag = bs_read1( p_bs );

    if( bs_remain( p_bs ) < 1 ) /* late fail */
        return false;

    p_sps->vui_parameters_present_flag = bs_read1( p_bs );
    if( p_sps->vui_parameters_present_flag &&
        !hevc_parse_vui_parameters_rbsp( p_bs, &p_sps->vui ) )
        return false;

    /* incomplete */

890 891 892 893 894 895 896 897
    return true;
}

void hevc_rbsp_release_sps( hevc_sequence_parameter_set_t *p_sps )
{
    free( p_sps );
}

898 899
IMPL_hevc_generic_decode( hevc_decode_sps, hevc_sequence_parameter_set_t,
                          hevc_parse_sequence_parameter_set_rbsp, hevc_rbsp_release_sps )
900 901 902 903 904 905 906

static bool hevc_parse_pic_parameter_set_rbsp( bs_t *p_bs,
                                               hevc_picture_parameter_set_t *p_pps )
{
    if( bs_remain( p_bs ) < 1 )
        return false;
    p_pps->pps_pic_parameter_set_id = bs_read_ue( p_bs );
907
    if( p_pps->pps_pic_parameter_set_id > HEVC_PPS_ID_MAX || bs_remain( p_bs ) < 1 )
908 909
        return false;
    p_pps->pps_seq_parameter_set_id = bs_read_ue( p_bs );
910
    if( p_pps->pps_seq_parameter_set_id > HEVC_SPS_ID_MAX )
911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946
        return false;
    p_pps->dependent_slice_segments_enabled_flag = bs_read1( p_bs );
    p_pps->output_flag_present_flag = bs_read1( p_bs );
    p_pps->num_extra_slice_header_bits = bs_read( p_bs, 3 );
    p_pps->sign_data_hiding_enabled_flag = bs_read1( p_bs );
    p_pps->cabac_init_present_flag = bs_read1( p_bs );

    p_pps->num_ref_idx_l0_default_active_minus1 = bs_read_ue( p_bs );
    p_pps->num_ref_idx_l1_default_active_minus1 = bs_read_ue( p_bs );

    p_pps->init_qp_minus26 = bs_read_se( p_bs );
    p_pps->constrained_intra_pred_flag = bs_read1( p_bs );
    p_pps->transform_skip_enabled_flag = bs_read1( p_bs );
    p_pps->cu_qp_delta_enabled_flag = bs_read1( p_bs );
    if( p_pps->cu_qp_delta_enabled_flag )
        p_pps->diff_cu_qp_delta_depth = bs_read_ue( p_bs );

    if( bs_remain( p_bs ) < 1 )
        return false;

    p_pps->pps_cb_qp_offset = bs_read_se( p_bs );
    p_pps->pps_cr_qp_offset = bs_read_se( p_bs );
    p_pps->pic_slice_level_chroma_qp_offsets_present_flag = bs_read1( p_bs );
    p_pps->weighted_pred_flag = bs_read1( p_bs );
    p_pps->weighted_bipred_flag = bs_read1( p_bs );
    p_pps->transquant_bypass_enable_flag = bs_read1( p_bs );
    p_pps->tiles_enabled_flag = bs_read1( p_bs );
    p_pps->entropy_coding_sync_enabled_flag = bs_read1( p_bs );

    if( p_pps->tiles_enabled_flag )
    {
        p_pps->num_tile_columns_minus1 = bs_read_ue( p_bs ); /* TODO: validate max col/row values */
        p_pps->num_tile_rows_minus1 = bs_read_ue( p_bs );    /*       against sps PicWidthInCtbsY */
        p_pps->uniform_spacing_flag = bs_read1( p_bs );
        if( !p_pps->uniform_spacing_flag )
        {
947 948 949
            if( bs_remain( p_bs ) < (uint64_t) p_pps->num_tile_columns_minus1 +
                                               p_pps->num_tile_rows_minus1 + 1 )
                return false;
950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000
            for( unsigned i=0; i< p_pps->num_tile_columns_minus1; i++ )
                (void) bs_read_ue( p_bs );
            for( unsigned i=0; i< p_pps->num_tile_rows_minus1; i++ )
                (void) bs_read_ue( p_bs );
        }
        p_pps->loop_filter_across_tiles_enabled_flag = bs_read1( p_bs );
    }

    p_pps->pps_loop_filter_across_slices_enabled_flag = bs_read1( p_bs );
    p_pps->deblocking_filter_control_present_flag = bs_read1( p_bs );
    if( p_pps->deblocking_filter_control_present_flag )
    {
        p_pps->deblocking_filter_override_enabled_flag = bs_read1( p_bs );
        p_pps->pps_deblocking_filter_disabled_flag = bs_read1( p_bs );
        if( !p_pps->pps_deblocking_filter_disabled_flag )
        {
            p_pps->pps_beta_offset_div2 = bs_read_se( p_bs );
            p_pps->pps_tc_offset_div2 = bs_read_se( p_bs );
        }
    }

    p_pps->scaling_list_data_present_flag = bs_read1( p_bs );
    if( p_pps->scaling_list_data_present_flag && !hevc_parse_scaling_list_rbsp( p_bs ) )
        return false;

    p_pps->lists_modification_present_flag = bs_read1( p_bs );
    p_pps->log2_parallel_merge_level_minus2 = bs_read_ue( p_bs );
    p_pps->slice_header_extension_present_flag = bs_read1( p_bs );

    if( bs_remain( p_bs ) < 1 )
        return false;

    p_pps->pps_extension_present_flag = bs_read1( p_bs );
    if( p_pps->pps_extension_present_flag )
    {
        p_pps->pps_range_extension_flag = bs_read1( p_bs );
        p_pps->pps_multilayer_extension_flag = bs_read1( p_bs );
        p_pps->pps_3d_extension_flag = bs_read1( p_bs );
        if( bs_remain( p_bs ) < 5 )
            return false;
        p_pps->pps_extension_5bits = bs_read( p_bs, 5 );
    }

    return true;
}

void hevc_rbsp_release_pps( hevc_picture_parameter_set_t *p_pps )
{
    free( p_pps );
}

1001 1002
IMPL_hevc_generic_decode( hevc_decode_pps, hevc_picture_parameter_set_t,
                          hevc_parse_pic_parameter_set_rbsp, hevc_rbsp_release_pps )
1003

1004 1005 1006 1007 1008 1009 1010 1011 1012 1013
uint8_t hevc_get_sps_vps_id( const hevc_sequence_parameter_set_t *p_sps )
{
    return p_sps->sps_video_parameter_set_id;
}

uint8_t hevc_get_pps_sps_id( const hevc_picture_parameter_set_t *p_pps )
{
    return p_pps->pps_seq_parameter_set_id;
}

1014 1015 1016 1017 1018
uint8_t hevc_get_slice_pps_id( const hevc_slice_segment_header_t *p_slice )
{
    return p_slice->slice_pic_parameter_set_id;
}

1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030
bool hevc_get_sps_profile_tier_level( const hevc_sequence_parameter_set_t *p_sps,
                                      uint8_t *pi_profile, uint8_t *pi_level)
{
    if(p_sps->profile_tier_level.general.profile_idc)
    {
        *pi_profile = p_sps->profile_tier_level.general.profile_idc;
        *pi_level = p_sps->profile_tier_level.general_level_idc;
        return true;
    }
    return false;
}

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bool hevc_get_picture_size( const hevc_sequence_parameter_set_t *p_sps,
                            unsigned *p_w, unsigned *p_h, unsigned *p_vw, unsigned *p_vh )
{
    *p_w = *p_vw = p_sps->pic_width_in_luma_samples;
    *p_h = *p_vh = p_sps->pic_height_in_luma_samples;
    if( p_sps->conformance_window_flag )
    {
        *p_vh -= p_sps->conf_win.bottom_offset + p_sps->conf_win.top_offset;
        *p_vh -= p_sps->conf_win.left_offset +  p_sps->conf_win.right_offset;
    }
    return true;
}

static inline uint8_t vlc_ceil_log2( uint32_t val )
{
    uint8_t n = 31 - clz(val);
    if (((unsigned)1 << n) != val)
        n++;
    return n;
}

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static bool hevc_get_picture_CtbsYsize( const hevc_sequence_parameter_set_t *p_sps, unsigned *p_w, unsigned *p_h )
{
    const unsigned int MinCbLog2SizeY = p_sps->log2_min_luma_coding_block_size_minus3 + 3;
    const unsigned int CtbLog2SizeY = MinCbLog2SizeY + p_sps->log2_diff_max_min_luma_coding_block_size;
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    if( CtbLog2SizeY > 31 )
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        return false;
    const unsigned int CtbSizeY = 1 << CtbLog2SizeY;
    *p_w = (p_sps->pic_width_in_luma_samples - 1) / CtbSizeY + 1;
    *p_h = (p_sps->pic_height_in_luma_samples - 1) / CtbSizeY + 1;
    return true;
}

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bool hevc_get_frame_rate( const hevc_sequence_parameter_set_t *p_sps,
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                          hevc_video_parameter_set_t **pp_vps,
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                          unsigned *pi_num, unsigned *pi_den )
{
    if( p_sps->vui_parameters_present_flag && p_sps->vui.vui_timing_info_present_flag )
    {
        *pi_den = p_sps->vui.timing.vui_num_units_in_tick;
        *pi_num = p_sps->vui.timing.vui_time_scale;
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        return (*pi_den && *pi_num);
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    }
    else if( pp_vps && pp_vps[p_sps->sps_video_parameter_set_id] &&
             pp_vps[p_sps->sps_video_parameter_set_id]->vps_timing_info_present_flag )
    {
        *pi_den = pp_vps[p_sps->sps_video_parameter_set_id]->vps_num_units_in_tick;
        *pi_num = pp_vps[p_sps->sps_video_parameter_set_id]->vps_time_scale;
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        return (*pi_den && *pi_num);
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    }
    return false;
}

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bool hevc_get_colorimetry( const hevc_sequence_parameter_set_t *p_sps,
                           video_color_primaries_t *p_primaries,
                           video_transfer_func_t *p_transfer,
                           video_color_space_t *p_colorspace,
                           bool *p_full_range )
{
    if( !p_sps->vui_parameters_present_flag )
        return false;
    *p_primaries =
        hxxx_colour_primaries_to_vlc( p_sps->vui.vs.colour.colour_primaries );
    *p_transfer =
        hxxx_transfer_characteristics_to_vlc( p_sps->vui.vs.colour.transfer_characteristics );
    *p_colorspace =
        hxxx_matrix_coeffs_to_vlc( p_sps->vui.vs.colour.matrix_coeffs );
    *p_full_range = p_sps->vui.vs.video_full_range_flag;
    return true;
}

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static bool hevc_parse_slice_segment_header_rbsp( bs_t *p_bs,
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                                                  pf_get_matchedxps get_matchedxps,
                                                  void *priv,
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                                                  hevc_slice_segment_header_t *p_sl )
{
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    hevc_sequence_parameter_set_t *p_sps;
    hevc_picture_parameter_set_t *p_pps;
    hevc_video_parameter_set_t *p_vps;

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    if( bs_remain( p_bs ) < 3 )
        return false;

    p_sl->first_slice_segment_in_pic_flag = bs_read1( p_bs );
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    if( p_sl->nal_type >= HEVC_NAL_BLA_W_LP && p_sl->nal_type <= HEVC_NAL_IRAP_VCL23 )
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        p_sl->no_output_of_prior_pics_flag = bs_read1( p_bs );
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    p_sl->slice_pic_parameter_set_id = bs_read_ue( p_bs );
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    if( p_sl->slice_pic_parameter_set_id > HEVC_PPS_ID_MAX || bs_remain( p_bs ) < 1 )
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        return false;

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    get_matchedxps( p_sl->slice_pic_parameter_set_id, priv, &p_pps, &p_sps, &p_vps );
    if(!p_sps || !p_pps)
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        return false;

    if( !p_sl->first_slice_segment_in_pic_flag )
    {
        if( p_pps->dependent_slice_segments_enabled_flag )
            p_sl->dependent_slice_segment_flag = bs_read1( p_bs );

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        if( !p_sps )
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            return false;

        unsigned w, h;
        if( !hevc_get_picture_CtbsYsize( p_sps, &w, &h ) )
            return false;

        (void) bs_read( p_bs, vlc_ceil_log2( w * h ) ); /* slice_segment_address */
    }

    if( !p_sl->dependent_slice_segment_flag )
    {
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        unsigned i=0;
        if( p_pps->num_extra_slice_header_bits > i )
        {
            i++;
            bs_skip( p_bs, 1 ); /* discardable_flag */
        }

        if( p_pps->num_extra_slice_header_bits > i )
        {
            i++;
            bs_skip( p_bs, 1 ); /* cross_layer_bla_flag */
        }

        if( i < p_pps->num_extra_slice_header_bits )
           bs_skip( p_bs, p_pps->num_extra_slice_header_bits - i );
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        p_sl->slice_type = bs_read_ue( p_bs );
        if( p_sl->slice_type > HEVC_SLICE_TYPE_I )
            return false;

        if( p_pps->output_flag_present_flag )
            p_sl->pic_output_flag = bs_read1( p_bs );
    }

    if( bs_remain( p_bs ) < 1 )
        return false;

    return true;
}

void hevc_rbsp_release_slice_header( hevc_slice_segment_header_t *p_sh )
{
    free( p_sh );
}

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hevc_slice_segment_header_t * hevc_decode_slice_header( const uint8_t *p_buf, size_t i_buf, bool b_escaped,
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                                                        pf_get_matchedxps get_matchedxps, void *priv )
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{
    hevc_slice_segment_header_t *p_sh = calloc(1, sizeof(hevc_slice_segment_header_t));
    if(likely(p_sh))
    {
        bs_t bs;
        bs_init( &bs, p_buf, i_buf );
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        unsigned i_bitflow = 0;
        if( b_escaped )
        {
            bs.p_fwpriv = &i_bitflow;
            bs.pf_forward = hxxx_bsfw_ep3b_to_rbsp;  /* Does the emulated 3bytes conversion to rbsp */
        }
        else (void) i_bitflow;
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        bs_skip( &bs, 1 );
        p_sh->nal_type = bs_read( &bs, 6 );
        p_sh->nuh_layer_id = bs_read( &bs, 6 );
        p_sh->temporal_id = bs_read( &bs, 3 );
        if( p_sh->nuh_layer_id > 62 ||
           !hevc_parse_slice_segment_header_rbsp( &bs, get_matchedxps, priv, p_sh ) )
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        {
            hevc_rbsp_release_slice_header( p_sh );
            p_sh = NULL;
        }
    }
    return p_sh;
}
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bool hevc_get_slice_type( const hevc_slice_segment_header_t *p_sli, enum hevc_slice_type_e *pi_type )
{
    if( !p_sli->dependent_slice_segment_flag )
    {
        *pi_type = p_sli->slice_type;
        return true;
    }
    return false;
}
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bool hevc_get_profile_level(const es_format_t *p_fmt, uint8_t *pi_profile,
                            uint8_t *pi_level, uint8_t *pi_nal_length_size)
{
    const uint8_t *p = (const uint8_t*)p_fmt->p_extra;
    if(p_fmt->i_extra < 23 || p[0] != 1)
        return false;

    /* HEVCDecoderConfigurationRecord */
    if(pi_profile)
        *pi_profile = p[1] & 0x1F;

    if(pi_level)
        *pi_level = p[12];

    if (pi_nal_length_size)
        *pi_nal_length_size = 1 + (p[21]&0x03);

    return true;
}