mp4cmn_pce.c

来自「这是在PCA下的基于IPP库示例代码例子,在网上下了IPP的库之后,设置相关参数」· C语言 代码 · 共 184 行

/*//////////////////////////////////////////////////////////////////////////////
//
//                  INTEL CORPORATION PROPRIETARY INFORMATION
//     This software is supplied under the terms of a license agreement or
//     nondisclosure agreement with Intel Corporation and may not be copied
//     or disclosed except in accordance with the terms of that agreement.
//          Copyright(c) 2003-2005 Intel Corporation. All Rights Reserved.
//
*/

#include "mp4cmn_pce.h"
#include "bstream.h"

int
dec_program_config_element(sProgram_config_element* p_data,sBitsreamBuffer* p_bs)
{
  int i;

  p_data->element_instance_tag = Getbits(p_bs,4);
  p_data->object_type = Getbits(p_bs,2);
  p_data->sampling_frequency_index = Getbits(p_bs,4);

  p_data->num_front_channels = p_data->num_front_channel_elements = Getbits(p_bs,4);
  p_data->num_side_channels  = p_data->num_side_channel_elements = Getbits(p_bs,4);
  p_data->num_back_channels  = p_data->num_back_channel_elements = Getbits(p_bs,4);
  p_data->num_lfe_channels   = p_data->num_lfe_channel_elements = Getbits(p_bs,2);

  p_data->num_assoc_data_elements = Getbits(p_bs,3);
  p_data->num_valid_cc_elements = Getbits(p_bs,4);

  p_data->mono_mixdown_present = Getbits(p_bs,1);
  if (p_data->mono_mixdown_present == 1)
  {
    p_data->mono_miwdown_element_number = Getbits(p_bs,4);
  }

  p_data->stereo_mixdown_present = Getbits(p_bs,1);
  if (p_data->stereo_mixdown_present == 1)
  {
    p_data->stereo_miwdown_element_number = Getbits(p_bs,4);
  }

  p_data->matrix_mixdown_idx_present = Getbits(p_bs,1);
  if (p_data->matrix_mixdown_idx_present == 1)
  {
    p_data->matrix_mixdown_idx = Getbits(p_bs,2);
    p_data->pseudo_surround_enable = Getbits(p_bs,1);
  }

  for (i = 0; i < p_data->num_front_channel_elements; i++)
  {
    p_data->num_front_channels += p_data->front_element_is_cpe[i] = Getbits(p_bs,1);
    p_data->front_element_tag_select[i] = Getbits(p_bs,4);
  }

  for (i = 0; i < p_data->num_side_channel_elements; i++)
  {
    p_data->num_side_channels += p_data->side_element_is_cpe[i] = Getbits(p_bs,1);
    p_data->side_element_tag_select[i] = Getbits(p_bs,4);
  }

  for (i = 0; i < p_data->num_back_channel_elements; i++)
  {
    p_data->num_back_channels += p_data->back_element_is_cpe[i] = Getbits(p_bs,1);
    p_data->back_element_tag_select[i] = Getbits(p_bs,4);
  }

  for (i = 0; i < p_data->num_lfe_channel_elements; i++)
  {
    p_data->lfe_element_tag_select[i] = Getbits(p_bs,4);
  }

  for (i = 0; i < p_data->num_assoc_data_elements; i++)
  {
    p_data->assoc_data_element_tag_select[i] = Getbits(p_bs,4);
  }

  for (i = 0; i < p_data->num_valid_cc_elements; i++)
  {
    p_data->cc_element_is_ind_sw[i] = Getbits(p_bs,1);
    p_data->valid_cc_element_tag_select[i] = Getbits(p_bs,4);
  }

  Byte_alignment(p_bs);

  p_data->comment_field_bytes = Getbits(p_bs,8);
  for (i = 0; i < p_data->comment_field_bytes; i++)
  {
    p_data->comment_field_data[i] = (char)Getbits(p_bs,8);
  }

  return p_data->element_instance_tag;
}

/***********************************************************************

    Unpack function(s) (support(s) alternative bitstream representation)

***********************************************************************/


int
unpack_program_config_element(sProgram_config_element * p_data,unsigned char **pp_bitstream, int *p_offset)
{
  int i;

//    get_bits(pp_bitstream,p_offset,

  p_data->element_instance_tag = get_bits(pp_bitstream,p_offset,4);
  p_data->object_type = get_bits(pp_bitstream,p_offset,2);
  p_data->sampling_frequency_index = get_bits(pp_bitstream,p_offset,4);

  p_data->num_front_channels = p_data->num_front_channel_elements = get_bits(pp_bitstream,p_offset,4);
  p_data->num_side_channels  = p_data->num_side_channel_elements = get_bits(pp_bitstream,p_offset,4);
  p_data->num_back_channels  = p_data->num_back_channel_elements = get_bits(pp_bitstream,p_offset,4);
  p_data->num_lfe_channels   = p_data->num_lfe_channel_elements = get_bits(pp_bitstream,p_offset,2);

  p_data->num_assoc_data_elements = get_bits(pp_bitstream,p_offset,3);
  p_data->num_valid_cc_elements = get_bits(pp_bitstream,p_offset,4);

  p_data->mono_mixdown_present = get_bits(pp_bitstream,p_offset,1);
  if (p_data->mono_mixdown_present == 1)
  {
    p_data->mono_miwdown_element_number = get_bits(pp_bitstream,p_offset,4);
  }

  p_data->stereo_mixdown_present = get_bits(pp_bitstream,p_offset,1);
  if (p_data->stereo_mixdown_present == 1)
  {
    p_data->stereo_miwdown_element_number = get_bits(pp_bitstream,p_offset,4);
  }

  p_data->matrix_mixdown_idx_present = get_bits(pp_bitstream,p_offset,1);
  if (p_data->matrix_mixdown_idx_present == 1)
  {
    p_data->matrix_mixdown_idx = get_bits(pp_bitstream,p_offset,2);
    p_data->pseudo_surround_enable = get_bits(pp_bitstream,p_offset,1);
  }

  for (i = 0; i < p_data->num_front_channel_elements; i++)
  {
    p_data->front_element_is_cpe[i] = get_bits(pp_bitstream,p_offset,1);
    p_data->front_element_tag_select[i] = get_bits(pp_bitstream,p_offset,4);
  }

  for (i = 0; i < p_data->num_side_channel_elements; i++)
  {
    p_data->side_element_is_cpe[i] = get_bits(pp_bitstream,p_offset,1);
    p_data->side_element_tag_select[i] = get_bits(pp_bitstream,p_offset,4);
  }

  for (i = 0; i < p_data->num_back_channel_elements; i++)
  {
    p_data->back_element_is_cpe[i] = get_bits(pp_bitstream,p_offset,1);
    p_data->back_element_tag_select[i] = get_bits(pp_bitstream,p_offset,4);
  }

  for (i = 0; i < p_data->num_lfe_channel_elements; i++)
  {
    p_data->lfe_element_tag_select[i] = get_bits(pp_bitstream,p_offset,4);
  }

  for (i = 0; i < p_data->num_assoc_data_elements; i++)
  {
    p_data->assoc_data_element_tag_select[i] = get_bits(pp_bitstream,p_offset,4);
  }

  for (i = 0; i < p_data->num_valid_cc_elements; i++)
  {
    p_data->cc_element_is_ind_sw[i] = get_bits(pp_bitstream,p_offset,1);
    p_data->valid_cc_element_tag_select[i] = get_bits(pp_bitstream,p_offset,4);
  }

  byte_alignment(pp_bitstream,p_offset);

  p_data->comment_field_bytes = get_bits(pp_bitstream,p_offset,8);
  for (i = 0; i < p_data->comment_field_bytes; i++)
  {
    p_data->comment_field_data[i] = (char)get_bits(pp_bitstream,p_offset,8);
  }

  return p_data->element_instance_tag;
}