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Created: 2023-03-26 06:13

/src/aac/libAACdec/src/FDK_delay.cpp
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/* -----------------------------------------------------------------------------
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Software License for The Fraunhofer FDK AAC Codec Library for Android
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© Copyright  1995 - 2019 Fraunhofer-Gesellschaft zur Förderung der angewandten
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Forschung e.V. All rights reserved.
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 1.    INTRODUCTION
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The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
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that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
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scheme for digital audio. This FDK AAC Codec software is intended to be used on
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a wide variety of Android devices.
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AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
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general perceptual audio codecs. AAC-ELD is considered the best-performing
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full-bandwidth communications codec by independent studies and is widely
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deployed. AAC has been standardized by ISO and IEC as part of the MPEG
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specifications.
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Patent licenses for necessary patent claims for the FDK AAC Codec (including
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those of Fraunhofer) may be obtained through Via Licensing
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(www.vialicensing.com) or through the respective patent owners individually for
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the purpose of encoding or decoding bit streams in products that are compliant
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with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
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Android devices already license these patent claims through Via Licensing or
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directly from the patent owners, and therefore FDK AAC Codec software may
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already be covered under those patent licenses when it is used for those
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licensed purposes only.
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Commercially-licensed AAC software libraries, including floating-point versions
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with enhanced sound quality, are also available from Fraunhofer. Users are
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encouraged to check the Fraunhofer website for additional applications
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information and documentation.
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2.    COPYRIGHT LICENSE
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Redistribution and use in source and binary forms, with or without modification,
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are permitted without payment of copyright license fees provided that you
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satisfy the following conditions:
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You must retain the complete text of this software license in redistributions of
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the FDK AAC Codec or your modifications thereto in source code form.
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You must retain the complete text of this software license in the documentation
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and/or other materials provided with redistributions of the FDK AAC Codec or
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your modifications thereto in binary form. You must make available free of
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charge copies of the complete source code of the FDK AAC Codec and your
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modifications thereto to recipients of copies in binary form.
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The name of Fraunhofer may not be used to endorse or promote products derived
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from this library without prior written permission.
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You may not charge copyright license fees for anyone to use, copy or distribute
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the FDK AAC Codec software or your modifications thereto.
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Your modified versions of the FDK AAC Codec must carry prominent notices stating
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that you changed the software and the date of any change. For modified versions
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of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
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must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
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AAC Codec Library for Android."
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3.    NO PATENT LICENSE
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NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
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limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
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Fraunhofer provides no warranty of patent non-infringement with respect to this
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software.
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You may use this FDK AAC Codec software or modifications thereto only for
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purposes that are authorized by appropriate patent licenses.
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4.    DISCLAIMER
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This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
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holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
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including but not limited to the implied warranties of merchantability and
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fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
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or consequential damages, including but not limited to procurement of substitute
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goods or services; loss of use, data, or profits, or business interruption,
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however caused and on any theory of liability, whether in contract, strict
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liability, or tort (including negligence), arising in any way out of the use of
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this software, even if advised of the possibility of such damage.
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5.    CONTACT INFORMATION
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Fraunhofer Institute for Integrated Circuits IIS
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Attention: Audio and Multimedia Departments - FDK AAC LL
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Am Wolfsmantel 33
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91058 Erlangen, Germany
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www.iis.fraunhofer.de/amm
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amm-info@iis.fraunhofer.de
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----------------------------------------------------------------------------- */
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/**************************** AAC decoder library ******************************
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   Author(s):   Matthias Hildenbrand
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   Description:
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*******************************************************************************/
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#include "FDK_delay.h"
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#include "genericStds.h"
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#define MAX_FRAME_LENGTH (1024)
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INT FDK_Delay_Create(FDK_SignalDelay* data, const USHORT delay,
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                     const UCHAR num_channels) {
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  FDK_ASSERT(data != NULL);
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  FDK_ASSERT(num_channels > 0);
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  if (delay > 0) {
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    data->delay_line =
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        (PCM_DEC*)FDKcalloc(num_channels * delay, sizeof(PCM_DEC));
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    if (data->delay_line == NULL) {
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      return -1;
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    }
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  } else {
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    data->delay_line = NULL;
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  }
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  data->num_channels = num_channels;
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  data->delay = delay;
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  return 0;
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}
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void FDK_Delay_Apply(FDK_SignalDelay* data, PCM_DEC* time_buffer,
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                     const UINT frame_length, const UCHAR channel) {
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  FDK_ASSERT(data != NULL);
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  if (data->delay > 0) {
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    C_ALLOC_SCRATCH_START(tmp, PCM_DEC, MAX_FRAME_LENGTH)
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    FDK_ASSERT(frame_length <= MAX_FRAME_LENGTH);
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    FDK_ASSERT(channel < data->num_channels);
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    FDK_ASSERT(time_buffer != NULL);
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    if (frame_length >= data->delay) {
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      FDKmemcpy(tmp, &time_buffer[frame_length - data->delay],
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                data->delay * sizeof(PCM_DEC));
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      FDKmemmove(&time_buffer[data->delay], &time_buffer[0],
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                 (frame_length - data->delay) * sizeof(PCM_DEC));
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      FDKmemcpy(&time_buffer[0], &data->delay_line[channel * data->delay],
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                data->delay * sizeof(PCM_DEC));
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      FDKmemcpy(&data->delay_line[channel * data->delay], tmp,
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                data->delay * sizeof(PCM_DEC));
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    } else {
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      FDKmemcpy(tmp, &time_buffer[0], frame_length * sizeof(PCM_DEC));
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      FDKmemcpy(&time_buffer[0], &data->delay_line[channel * data->delay],
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                frame_length * sizeof(PCM_DEC));
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      FDKmemcpy(&data->delay_line[channel * data->delay],
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                &data->delay_line[channel * data->delay + frame_length],
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                (data->delay - frame_length) * sizeof(PCM_DEC));
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      FDKmemcpy(&data->delay_line[channel * data->delay +
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                                  (data->delay - frame_length)],
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                tmp, frame_length * sizeof(PCM_DEC));
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    }
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    C_ALLOC_SCRATCH_END(tmp, PCM_DEC, MAX_FRAME_LENGTH)
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  }
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  return;
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}
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void FDK_Delay_Destroy(FDK_SignalDelay* data) {
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  if (data->delay_line != NULL) {
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    FDKfree(data->delay_line);
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  }
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  data->delay_line = NULL;
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  data->delay = 0;
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  data->num_channels = 0;
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  return;
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}