parset.c

可以用H.264编码解码器源码(c语言)

/*!
 ************************************************************************
 *  \file
 *     parset.c
 *  \brief
 *     Parameter Sets
 *  \author
 *     Main contributors (see contributors.h for copyright, address and affiliation details)
 *     - Stephan Wenger          <[e-mail]>
 *
 ***********************************************************************
 */

#include <stdlib.h>
#include <assert.h>
#include <string.h>

#include "global.h"
#include "parsetcommon.h"
#include "parset.h"
#include "nalu.h"
#include "memalloc.h"
#include "fmo.h"
#include "cabac.h"
#include "vlc.h"

#if TRACE
#define SYMTRACESTRING(s) strncpy(sym->tracestring,s,TRACESTRING_SIZE)
#else
#define SYMTRACESTRING(s) // do nothing
#endif

extern int UsedBits;      // for internal statistics, is adjusted by se_v, ue_v, u_1

seq_parameter_set_rbsp_t SeqParSet[MAXSPS];
pic_parameter_set_rbsp_t PicParSet[MAXPPS];
                          
// fill sps with content of p

int InterpretSPS (DataPartition *p, seq_parameter_set_rbsp_t *sps)
{
  unsigned i;
  int reserved_zero;
  Bitstream *s = p->bitstream;

  assert (p != NULL);
  assert (p->bitstream != NULL);
  assert (p->bitstream->streamBuffer != 0);
  assert (sps != NULL);

  UsedBits = 0;

  sps->profile_idc                            = u_v  (8, "SPS: profile_idc"                           , s);

  sps->constrained_set0_flag                  = u_1  (   "SPS: constrained_set0_flag"                 , s);
  sps->constrained_set1_flag                  = u_1  (   "SPS: constrained_set1_flag"                 , s);
  sps->constrained_set2_flag                  = u_1  (   "SPS: constrained_set2_flag"                 , s);
  reserved_zero                               = u_v  (5, "SPS: reserved_zero_5bits"                   , s);
  assert (reserved_zero==0);

  sps->level_idc                              = u_v  (8, "SPS: level_idc"                             , s);
  

  sps->seq_parameter_set_id                   = ue_v ("SPS: seq_parameter_set_id"                     , s);
  sps->log2_max_frame_num_minus4              = ue_v ("SPS: log2_max_frame_num_minus4"                , s);
  sps->pic_order_cnt_type                     = ue_v ("SPS: pic_order_count_type"                     , s);

  if (sps->pic_order_cnt_type == 0)
    sps->log2_max_pic_order_cnt_lsb_minus4 = ue_v ("SPS: log2_max_pic_order_cnt_lsb_minus4"           , s);
  else if (sps->pic_order_cnt_type == 1)
  {
    sps->delta_pic_order_always_zero_flag      = u_1  ("SPS: delta_pic_order_always_zero_flag"       , s);
    sps->offset_for_non_ref_pic                = se_v ("SPS: offset_for_non_ref_pic"                 , s);
    sps->offset_for_top_to_bottom_field        = se_v ("SPS: offset_for_top_to_bottom_field"         , s);
    sps->num_ref_frames_in_pic_order_cnt_cycle = ue_v ("SPS: num_ref_frames_in_pic_order_cnt_cycle"  , s);
    for(i=0; i<sps->num_ref_frames_in_pic_order_cnt_cycle; i++)
      sps->offset_for_ref_frame[i]               = se_v ("SPS: offset_for_ref_frame[i]"              , s);
  }
  sps->num_ref_frames                        = ue_v ("SPS: num_ref_frames"                         , s);
  sps->gaps_in_frame_num_value_allowed_flag  = u_1  ("SPS: gaps_in_frame_num_value_allowed_flag"   , s);
  sps->pic_width_in_mbs_minus1               = ue_v ("SPS: pic_width_in_mbs_minus1"                , s);
  sps->pic_height_in_map_units_minus1        = ue_v ("SPS: pic_height_in_map_units_minus1"         , s);
  sps->frame_mbs_only_flag                   = u_1  ("SPS: frame_mbs_only_flag"                    , s);
  if (!sps->frame_mbs_only_flag)
  {
    sps->mb_adaptive_frame_field_flag          = u_1  ("SPS: mb_adaptive_frame_field_flag"           , s);
  }
  sps->direct_8x8_inference_flag             = u_1  ("SPS: direct_8x8_inference_flag"              , s);
  sps->frame_cropping_flag                   = u_1  ("SPS: frame_cropping_flag"                , s);

  if (sps->frame_cropping_flag)
  {
    sps->frame_cropping_rect_left_offset      = ue_v ("SPS: frame_cropping_rect_left_offset"           , s);
    sps->frame_cropping_rect_right_offset     = ue_v ("SPS: frame_cropping_rect_right_offset"          , s);
    sps->frame_cropping_rect_top_offset       = ue_v ("SPS: frame_cropping_rect_top_offset"            , s);
    sps->frame_cropping_rect_bottom_offset    = ue_v ("SPS: frame_cropping_rect_bottom_offset"         , s);
  }
  sps->vui_parameters_present_flag           = u_1  ("SPS: vui_parameters_present_flag"            , s);
  if (sps->vui_parameters_present_flag)
  {
    printf ("VUI sequence parameters present but not supported, ignored, proceeding to next NALU\n");
  }
  sps->Valid = TRUE;
  return UsedBits;
}


int InterpretPPS (DataPartition *p, pic_parameter_set_rbsp_t *pps)
{
  unsigned i;
  int NumberBitsPerSliceGroupId;
  Bitstream *s = p->bitstream;
  
  assert (p != NULL);
  assert (p->bitstream != NULL);
  assert (p->bitstream->streamBuffer != 0);
  assert (pps != NULL);

  UsedBits = 0;

  pps->pic_parameter_set_id                  = ue_v ("PPS: pic_parameter_set_id"                   , s);
  pps->seq_parameter_set_id                  = ue_v ("PPS: seq_parameter_set_id"                   , s);
  pps->entropy_coding_mode_flag              = u_1  ("PPS: entropy_coding_mode_flag"               , s);

  //! Note: as per JVT-F078 the following bit is unconditional.  If F078 is not accepted, then
  //! one has to fetch the correct SPS to check whether the bit is present (hopefully there is
  //! no consistency problem :-(
  //! The current encoder code handles this in the same way.  When you change this, don't forget
  //! the encoder!  StW, 12/8/02
  pps->pic_order_present_flag                = u_1  ("PPS: pic_order_present_flag"                 , s);

  pps->num_slice_groups_minus1               = ue_v ("PPS: num_slice_groups_minus1"                , s);

  // FMO stuff begins here
  if (pps->num_slice_groups_minus1 > 0)
  {
    pps->slice_group_map_type               = ue_v ("PPS: slice_group_map_type"                , s);
    if (pps->slice_group_map_type == 0)
    {
      for (i=0; i<=pps->num_slice_groups_minus1; i++)
        pps->run_length_minus1 [i]                  = ue_v ("PPS: run_length_minus1 [i]"              , s);
    }
    else if (pps->slice_group_map_type == 2)
    {
      for (i=0; i<pps->num_slice_groups_minus1; i++)
      {
        //! JVT-F078: avoid reference of SPS by using ue(v) instead of u(v)
        pps->top_left [i]                          = ue_v ("PPS: top_left [i]"                        , s);
        pps->bottom_right [i]                      = ue_v ("PPS: bottom_right [i]"                    , s);
      }
    }
    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     = u_1  ("PPS: slice_group_change_direction_flag"      , s);
      pps->slice_group_change_rate_minus1        = ue_v ("PPS: slice_group_change_rate_minus1"         , s);
    }
    else if (pps->slice_group_map_type == 6)
    {
      if (pps->num_slice_groups_minus1+1 >4)
        NumberBitsPerSliceGroupId = 3;
      else if (pps->num_slice_groups_minus1+1 > 2)
        NumberBitsPerSliceGroupId = 2;
      else
        NumberBitsPerSliceGroupId = 1;
      //! JVT-F078, exlicitly signal number of MBs in the map
      pps->num_slice_group_map_units_minus1      = ue_v ("PPS: num_slice_group_map_units_minus1"               , s);
      for (i=0; i<=pps->num_slice_group_map_units_minus1; i++)
        pps->slice_group_id[i] = u_v (NumberBitsPerSliceGroupId, "slice_group_id[i]", s);
    }
  }

  // End of FMO stuff

  pps->num_ref_idx_l0_active_minus1          = ue_v ("PPS: num_ref_idx_l0_active_minus1"           , s);
  pps->num_ref_idx_l1_active_minus1          = ue_v ("PPS: num_ref_idx_l1_active_minus1"           , s);
  pps->weighted_pred_flag                    = u_1  ("PPS: weighted prediction flag"               , s);
  pps->weighted_bipred_idc                   = u_v  ( 2, "PPS: weighted_bipred_idc"                , s);
  pps->pic_init_qp_minus26                   = se_v ("PPS: pic_init_qp_minus26"                    , s);
  pps->pic_init_qs_minus26                   = se_v ("PPS: pic_init_qs_minus26"                    , s);
  pps->chroma_qp_index_offset                = se_v ("PPS: chroma_qp_index_offset"                 , s);
  pps->deblocking_filter_control_present_flag = u_1 ("PPS: deblocking_filter_control_present_flag" , s);
  pps->constrained_intra_pred_flag           = u_1  ("PPS: constrained_intra_pred_flag"            , s);
  pps->redundant_pic_cnt_present_flag        = u_1  ("PPS: redundant_pic_cnt_present_flag"         , s);

  pps->Valid = TRUE;
  return UsedBits;
}