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📄 mp4_parser_audio.c

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/*****************************************************************************
*  Copyright Statement:
*  --------------------
*  This software is protected by Copyright and the information contained
*  herein is confidential. The software may not be copied and the information
*  contained herein may not be used or disclosed except with the written
*  permission of MediaTek Inc. (C) 2005
*
*  BY OPENING THIS FILE, BUYER HEREBY UNEQUIVOCALLY ACKNOWLEDGES AND AGREES
*  THAT THE SOFTWARE/FIRMWARE AND ITS DOCUMENTATIONS ("MEDIATEK SOFTWARE")
*  RECEIVED FROM MEDIATEK AND/OR ITS REPRESENTATIVES ARE PROVIDED TO BUYER ON
*  AN "AS-IS" BASIS ONLY. MEDIATEK EXPRESSLY DISCLAIMS ANY AND ALL WARRANTIES,
*  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF
*  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT.
*  NEITHER DOES MEDIATEK PROVIDE ANY WARRANTY WHATSOEVER WITH RESPECT TO THE
*  SOFTWARE OF ANY THIRD PARTY WHICH MAY BE USED BY, INCORPORATED IN, OR
*  SUPPLIED WITH THE MEDIATEK SOFTWARE, AND BUYER AGREES TO LOOK ONLY TO SUCH
*  THIRD PARTY FOR ANY WARRANTY CLAIM RELATING THERETO. MEDIATEK SHALL ALSO
*  NOT BE RESPONSIBLE FOR ANY MEDIATEK SOFTWARE RELEASES MADE TO BUYER'S
*  SPECIFICATION OR TO CONFORM TO A PARTICULAR STANDARD OR OPEN FORUM.
*
*  BUYER'S SOLE AND EXCLUSIVE REMEDY AND MEDIATEK'S ENTIRE AND CUMULATIVE
*  LIABILITY WITH RESPECT TO THE MEDIATEK SOFTWARE RELEASED HEREUNDER WILL BE,
*  AT MEDIATEK'S OPTION, TO REVISE OR REPLACE THE MEDIATEK SOFTWARE AT ISSUE,
*  OR REFUND ANY SOFTWARE LICENSE FEES OR SERVICE CHARGE PAID BY BUYER TO
*  MEDIATEK FOR SUCH MEDIATEK SOFTWARE AT ISSUE. 
*
*  THE TRANSACTION CONTEMPLATED HEREUNDER SHALL BE CONSTRUED IN ACCORDANCE
*  WITH THE LAWS OF THE STATE OF CALIFORNIA, USA, EXCLUDING ITS CONFLICT OF
*  LAWS PRINCIPLES.  ANY DISPUTES, CONTROVERSIES OR CLAIMS ARISING THEREOF AND
*  RELATED THERETO SHALL BE SETTLED BY ARBITRATION IN SAN FRANCISCO, CA, UNDER
*  THE RULES OF THE INTERNATIONAL CHAMBER OF COMMERCE (ICC).
*
*****************************************************************************/

/*******************************************************************************
 *
 * Filename:
 * ---------
 * mp4_parser_audio.c
 *
 * Project:
 * --------
 *   MAUI
 *
 * Description:
 * ------------
 *   MPEG-4 Parser, for handling audio-related boxes
 *
 * Author:
 * -------
 * -------
 *
 *==============================================================================
 *             HISTORY
 * Below this line, this part is controlled by PVCS VM. DO NOT MODIFY!!
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 *==============================================================================
 *******************************************************************************/
 
#include "mp4_parser.h"

/*
   Convert sampling frequency to sampling frequency index.
   Refer to 14496-3 Subpart 4
*/
kal_uint32 convertSamplingFreqToIndex(kal_uint32 uSamplingFreq)
{
   kal_uint32 uSamplingFreqIndex;
   if (uSamplingFreq>=92017) uSamplingFreqIndex = 0x0;
   else if (uSamplingFreq>=75132) uSamplingFreqIndex = 0x1;
   else if (uSamplingFreq>=55426) uSamplingFreqIndex = 0x2;
   else if (uSamplingFreq>=46009) uSamplingFreqIndex = 0x3;
   else if (uSamplingFreq>=37566) uSamplingFreqIndex = 0x4;
   else if (uSamplingFreq>=27713) uSamplingFreqIndex = 0x5;
   else if (uSamplingFreq>=23004) uSamplingFreqIndex = 0x6;
   else if (uSamplingFreq>=18783) uSamplingFreqIndex = 0x7;
   else if (uSamplingFreq>=13856) uSamplingFreqIndex = 0x8;
   else if (uSamplingFreq>=11502) uSamplingFreqIndex = 0x9;
   else if (uSamplingFreq>=9391) uSamplingFreqIndex = 0xa;
   else uSamplingFreqIndex = 0xb;
   
   return uSamplingFreqIndex;
}



/*
DESCRIPTION
   Parse the Program Config Element of AudioSpecificConfig of 14496-3.
INPUT
   *puBitCnt: current bit offset
RETURN
   MP4_PARSER_OK: Successful
   other values: Error
*/

static MP4_Parser_Status mp4_parse_decoder_config_14496_3_pce(STMp4Parser *pstMp4Parser, kal_uint32 *puBitCnt)
{
   kal_uint32 uInitialBitCnt = *puBitCnt;
   kal_uint8 element_instance_tag;
   kal_uint8 object_type;
   kal_uint8 sampling_freq_index;
   kal_uint8 num_front_channel_elements;
   kal_uint8 num_side_channel_elements;
   kal_uint8 num_back_channel_elements;
   kal_uint8 num_lfe_channel_elements;
   kal_uint8 num_assoc_data_elements;
   kal_uint8 num_valid_cc_elements;
   kal_uint8 mono_mixdown_present;
   kal_uint8 stereo_mixdown_present;
   kal_uint8 matrix_mixdown_idx_present;
   kal_uint8 discard;
   kal_uint8 i;

   MP4_PARSER_CHECK_ARG(pstMp4Parser!=NULL);
   MP4_PARSER_CHECK_ARG(puBitCnt!=NULL);

   if((pstMp4Parser->eFSALErr=FSAL_Read_Bits(pstMp4Parser->pstFSAL, puBitCnt, &element_instance_tag, 4))!=FSAL_OK)
      return MP4_PARSER_FILE_READ_ERROR;
   if((pstMp4Parser->eFSALErr=FSAL_Read_Bits(pstMp4Parser->pstFSAL, puBitCnt, &object_type, 2))!=MP4_PARSER_OK)
      return MP4_PARSER_FILE_READ_ERROR;
   if((pstMp4Parser->eFSALErr=FSAL_Read_Bits(pstMp4Parser->pstFSAL, puBitCnt, &sampling_freq_index, 4))!=MP4_PARSER_OK)
      return MP4_PARSER_FILE_READ_ERROR;
   if((pstMp4Parser->eFSALErr=FSAL_Read_Bits(pstMp4Parser->pstFSAL, puBitCnt, &num_front_channel_elements, 4))!=MP4_PARSER_OK)
      return MP4_PARSER_FILE_READ_ERROR;
   if((pstMp4Parser->eFSALErr=FSAL_Read_Bits(pstMp4Parser->pstFSAL, puBitCnt, &num_side_channel_elements, 4))!=MP4_PARSER_OK)
      return MP4_PARSER_FILE_READ_ERROR;
   if((pstMp4Parser->eFSALErr=FSAL_Read_Bits(pstMp4Parser->pstFSAL, puBitCnt, &num_back_channel_elements, 4))!=MP4_PARSER_OK)
      return MP4_PARSER_FILE_READ_ERROR;
   if((pstMp4Parser->eFSALErr=FSAL_Read_Bits(pstMp4Parser->pstFSAL, puBitCnt, &num_lfe_channel_elements, 2))!=MP4_PARSER_OK)
      return MP4_PARSER_FILE_READ_ERROR;
   if((pstMp4Parser->eFSALErr=FSAL_Read_Bits(pstMp4Parser->pstFSAL, puBitCnt, &num_assoc_data_elements, 3))!=MP4_PARSER_OK)
      return MP4_PARSER_FILE_READ_ERROR;
   if((pstMp4Parser->eFSALErr=FSAL_Read_Bits(pstMp4Parser->pstFSAL, puBitCnt, &num_valid_cc_elements, 4))!=MP4_PARSER_OK)
      return MP4_PARSER_FILE_READ_ERROR;
   /* mono mixdown */
   if((pstMp4Parser->eFSALErr=FSAL_Read_Bits(pstMp4Parser->pstFSAL, puBitCnt, &mono_mixdown_present, 1))!=MP4_PARSER_OK)
      return MP4_PARSER_FILE_READ_ERROR;
   if(mono_mixdown_present) {
      if((pstMp4Parser->eFSALErr=FSAL_Read_Bits(pstMp4Parser->pstFSAL, puBitCnt, &discard, 4))!=MP4_PARSER_OK)
         return MP4_PARSER_FILE_READ_ERROR;
   }
   /* stereo mixdown */
   if((pstMp4Parser->eFSALErr=FSAL_Read_Bits(pstMp4Parser->pstFSAL, puBitCnt, &stereo_mixdown_present, 1))!=MP4_PARSER_OK)
      return MP4_PARSER_FILE_READ_ERROR;
   if(stereo_mixdown_present) {
      if((pstMp4Parser->eFSALErr=FSAL_Read_Bits(pstMp4Parser->pstFSAL, puBitCnt, &discard, 4))!=MP4_PARSER_OK)
         return MP4_PARSER_FILE_READ_ERROR;
   }
   /* matrix mixdown */
   if((pstMp4Parser->eFSALErr=FSAL_Read_Bits(pstMp4Parser->pstFSAL, puBitCnt, &matrix_mixdown_idx_present, 1))!=MP4_PARSER_OK)
      return MP4_PARSER_FILE_READ_ERROR;
   if(matrix_mixdown_idx_present) {
      if((pstMp4Parser->eFSALErr=FSAL_Read_Bits(pstMp4Parser->pstFSAL, puBitCnt, &discard, 3))!=MP4_PARSER_OK)
         return MP4_PARSER_FILE_READ_ERROR;
   }
   /* front channel element */
   for(i=0; i<num_front_channel_elements; i++) {
      if((pstMp4Parser->eFSALErr=FSAL_Read_Bits(pstMp4Parser->pstFSAL, puBitCnt, &discard, 5))!=MP4_PARSER_OK)
         return MP4_PARSER_FILE_READ_ERROR;
   }
   /* side channel element */
   for(i=0; i<num_side_channel_elements; i++) {
      if((pstMp4Parser->eFSALErr=FSAL_Read_Bits(pstMp4Parser->pstFSAL, puBitCnt, &discard, 5))!=MP4_PARSER_OK)
         return MP4_PARSER_FILE_READ_ERROR;
   }
   /* back channel element */
   for(i=0; i<num_back_channel_elements; i++) {
      if((pstMp4Parser->eFSALErr=FSAL_Read_Bits(pstMp4Parser->pstFSAL, puBitCnt, &discard, 5))!=MP4_PARSER_OK)
         return MP4_PARSER_FILE_READ_ERROR;
   }
   /* lfe channel element */
   for(i=0; i<num_lfe_channel_elements; i++) {
      if((pstMp4Parser->eFSALErr=FSAL_Read_Bits(pstMp4Parser->pstFSAL, puBitCnt, &discard, 4))!=MP4_PARSER_OK)
         return MP4_PARSER_FILE_READ_ERROR;
   }
   /* assoc data element */
   for(i=0; i<num_assoc_data_elements; i++) {
      if((pstMp4Parser->eFSALErr=FSAL_Read_Bits(pstMp4Parser->pstFSAL, puBitCnt, &discard, 4))!=MP4_PARSER_OK)
         return MP4_PARSER_FILE_READ_ERROR;
   }
   /* valid cc element */
   for(i=0; i<num_valid_cc_elements; i++) {
      if((pstMp4Parser->eFSALErr=FSAL_Read_Bits(pstMp4Parser->pstFSAL, puBitCnt, &discard, 5))!=MP4_PARSER_OK)
         return MP4_PARSER_FILE_READ_ERROR;
   }
   pstMp4Parser->uAudioPCEBitLength = (*puBitCnt)-uInitialBitCnt;

   return MP4_PARSER_OK;
}


/*
DESCRIPTION
   Parse Sample Entry MP4A.
INPUT
   size: The size of Sample Entry MP4A excluding Box
RETURN
   MP4_PARSER_OK: Successful
   other values: Error
*/

MP4_Parser_Status mp4_parse_mp4a(STMp4Parser *pstMp4Parser, long mp4a_size)
{
   /* Sample Entry MP4A is a leaf node. */
   MP4_Parser_Status ret;

   /* Audio Sample Entry */
   kal_uint16 channelcount;
   kal_uint16 samplesize;
   kal_uint32 samplerate;

   MP4_PARSER_CHECK_ARG(pstMp4Parser!=NULL);

   /* Sample Entry */
   if((pstMp4Parser->eFSALErr=FSAL_Skip_Bytes(pstMp4Parser->pstFSAL, 8))!=FSAL_OK)
      return MP4_PARSER_FILE_SEEK_ERROR;
   mp4a_size-=8;

   /* Audio Sample Entry */
   if((pstMp4Parser->eFSALErr=FSAL_Skip_Bytes(pstMp4Parser->pstFSAL, 8))!=FSAL_OK)
      return MP4_PARSER_FILE_SEEK_ERROR;
   if((pstMp4Parser->eFSALErr=FSAL_Read_UINT16(pstMp4Parser->pstFSAL, &channelcount))!=FSAL_OK)
      return MP4_PARSER_PARSE_ERROR;
   if((pstMp4Parser->eFSALErr=FSAL_Read_UINT16(pstMp4Parser->pstFSAL, &samplesize))!=FSAL_OK)
      return MP4_PARSER_PARSE_ERROR;
   if((pstMp4Parser->eFSALErr=FSAL_Skip_Bytes(pstMp4Parser->pstFSAL, 4))!=FSAL_OK)
      return MP4_PARSER_FILE_SEEK_ERROR;
   if((pstMp4Parser->eFSALErr=FSAL_Read_UINT(pstMp4Parser->pstFSAL, &samplerate))!=FSAL_OK)
      return MP4_PARSER_FILE_READ_ERROR;

   mp4a_size-=20;
#if MP4_PARSER_VERBOSE
   printf("channel=%u, samplesize=%u, samplerate=%u\n",
      channelcount, samplesize, samplerate>>16);
#endif

   /* ESDBox */
   {
      unsigned int size;
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