| /* ----------------------------------------------------------------------------- |
| Software License for The Fraunhofer FDK AAC Codec Library for Android |
| |
| © Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten |
| Forschung e.V. All rights reserved. |
| |
| 1. INTRODUCTION |
| The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software |
| that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding |
| scheme for digital audio. This FDK AAC Codec software is intended to be used on |
| a wide variety of Android devices. |
| |
| AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient |
| general perceptual audio codecs. AAC-ELD is considered the best-performing |
| full-bandwidth communications codec by independent studies and is widely |
| deployed. AAC has been standardized by ISO and IEC as part of the MPEG |
| specifications. |
| |
| Patent licenses for necessary patent claims for the FDK AAC Codec (including |
| those of Fraunhofer) may be obtained through Via Licensing |
| (www.vialicensing.com) or through the respective patent owners individually for |
| the purpose of encoding or decoding bit streams in products that are compliant |
| with the ISO/IEC MPEG audio standards. Please note that most manufacturers of |
| Android devices already license these patent claims through Via Licensing or |
| directly from the patent owners, and therefore FDK AAC Codec software may |
| already be covered under those patent licenses when it is used for those |
| licensed purposes only. |
| |
| Commercially-licensed AAC software libraries, including floating-point versions |
| with enhanced sound quality, are also available from Fraunhofer. Users are |
| encouraged to check the Fraunhofer website for additional applications |
| information and documentation. |
| |
| 2. COPYRIGHT LICENSE |
| |
| Redistribution and use in source and binary forms, with or without modification, |
| are permitted without payment of copyright license fees provided that you |
| satisfy the following conditions: |
| |
| You must retain the complete text of this software license in redistributions of |
| the FDK AAC Codec or your modifications thereto in source code form. |
| |
| You must retain the complete text of this software license in the documentation |
| and/or other materials provided with redistributions of the FDK AAC Codec or |
| your modifications thereto in binary form. You must make available free of |
| charge copies of the complete source code of the FDK AAC Codec and your |
| modifications thereto to recipients of copies in binary form. |
| |
| The name of Fraunhofer may not be used to endorse or promote products derived |
| from this library without prior written permission. |
| |
| You may not charge copyright license fees for anyone to use, copy or distribute |
| the FDK AAC Codec software or your modifications thereto. |
| |
| Your modified versions of the FDK AAC Codec must carry prominent notices stating |
| that you changed the software and the date of any change. For modified versions |
| of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android" |
| must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK |
| AAC Codec Library for Android." |
| |
| 3. NO PATENT LICENSE |
| |
| NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without |
| limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE. |
| Fraunhofer provides no warranty of patent non-infringement with respect to this |
| software. |
| |
| You may use this FDK AAC Codec software or modifications thereto only for |
| purposes that are authorized by appropriate patent licenses. |
| |
| 4. DISCLAIMER |
| |
| This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright |
| holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, |
| including but not limited to the implied warranties of merchantability and |
| fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR |
| CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, |
| or consequential damages, including but not limited to procurement of substitute |
| goods or services; loss of use, data, or profits, or business interruption, |
| however caused and on any theory of liability, whether in contract, strict |
| liability, or tort (including negligence), arising in any way out of the use of |
| this software, even if advised of the possibility of such damage. |
| |
| 5. CONTACT INFORMATION |
| |
| Fraunhofer Institute for Integrated Circuits IIS |
| Attention: Audio and Multimedia Departments - FDK AAC LL |
| Am Wolfsmantel 33 |
| 91058 Erlangen, Germany |
| |
| www.iis.fraunhofer.de/amm |
| amm-info@iis.fraunhofer.de |
| ----------------------------------------------------------------------------- */ |
| |
| /**************************** AAC decoder library ****************************** |
| |
| Author(s): Matthias Hildenbrand |
| |
| Description: |
| |
| *******************************************************************************/ |
| |
| #include "FDK_delay.h" |
| |
| #include "genericStds.h" |
| |
| #define MAX_FRAME_LENGTH (1024) |
| |
| INT FDK_Delay_Create(FDK_SignalDelay* data, const USHORT delay, |
| const UCHAR num_channels) { |
| FDK_ASSERT(data != NULL); |
| FDK_ASSERT(num_channels > 0); |
| |
| if (delay > 0) { |
| data->delay_line = |
| (INT_PCM*)FDKcalloc(num_channels * delay, sizeof(INT_PCM)); |
| if (data->delay_line == NULL) { |
| return -1; |
| } |
| } else { |
| data->delay_line = NULL; |
| } |
| data->num_channels = num_channels; |
| data->delay = delay; |
| |
| return 0; |
| } |
| |
| void FDK_Delay_Apply(FDK_SignalDelay* data, FIXP_PCM* time_buffer, |
| const UINT frame_length, const UCHAR channel) { |
| FDK_ASSERT(data != NULL); |
| |
| if (data->delay > 0) { |
| C_ALLOC_SCRATCH_START(tmp, FIXP_PCM, MAX_FRAME_LENGTH) |
| FDK_ASSERT(frame_length <= MAX_FRAME_LENGTH); |
| FDK_ASSERT(channel < data->num_channels); |
| FDK_ASSERT(time_buffer != NULL); |
| if (frame_length >= data->delay) { |
| FDKmemcpy(tmp, &time_buffer[frame_length - data->delay], |
| data->delay * sizeof(FIXP_PCM)); |
| FDKmemmove(&time_buffer[data->delay], &time_buffer[0], |
| (frame_length - data->delay) * sizeof(FIXP_PCM)); |
| FDKmemcpy(&time_buffer[0], &data->delay_line[channel * data->delay], |
| data->delay * sizeof(FIXP_PCM)); |
| FDKmemcpy(&data->delay_line[channel * data->delay], tmp, |
| data->delay * sizeof(FIXP_PCM)); |
| } else { |
| FDKmemcpy(tmp, &time_buffer[0], frame_length * sizeof(FIXP_PCM)); |
| FDKmemcpy(&time_buffer[0], &data->delay_line[channel * data->delay], |
| frame_length * sizeof(FIXP_PCM)); |
| FDKmemcpy(&data->delay_line[channel * data->delay], |
| &data->delay_line[channel * data->delay + frame_length], |
| (data->delay - frame_length) * sizeof(FIXP_PCM)); |
| FDKmemcpy(&data->delay_line[channel * data->delay + |
| (data->delay - frame_length)], |
| tmp, frame_length * sizeof(FIXP_PCM)); |
| } |
| C_ALLOC_SCRATCH_END(tmp, FIXP_PCM, MAX_FRAME_LENGTH) |
| } |
| |
| return; |
| } |
| |
| void FDK_Delay_Destroy(FDK_SignalDelay* data) { |
| if (data->delay_line != NULL) { |
| FDKfree(data->delay_line); |
| } |
| data->delay_line = NULL; |
| data->delay = 0; |
| data->num_channels = 0; |
| |
| return; |
| } |