| /* ----------------------------------------------------------------------------- | |
| Software License for The Fraunhofer FDK AAC Codec Library for Android | |
| © Copyright 1995 - 2019 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 = | |
| (PCM_DEC*)FDKcalloc(num_channels * delay, sizeof(PCM_DEC)); | |
| 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, PCM_DEC* time_buffer, | |
| const UINT frame_length, const UCHAR channel) { | |
| FDK_ASSERT(data != NULL); | |
| if (data->delay > 0) { | |
| C_ALLOC_SCRATCH_START(tmp, PCM_DEC, 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(PCM_DEC)); | |
| FDKmemmove(&time_buffer[data->delay], &time_buffer[0], | |
| (frame_length - data->delay) * sizeof(PCM_DEC)); | |
| FDKmemcpy(&time_buffer[0], &data->delay_line[channel * data->delay], | |
| data->delay * sizeof(PCM_DEC)); | |
| FDKmemcpy(&data->delay_line[channel * data->delay], tmp, | |
| data->delay * sizeof(PCM_DEC)); | |
| } else { | |
| FDKmemcpy(tmp, &time_buffer[0], frame_length * sizeof(PCM_DEC)); | |
| FDKmemcpy(&time_buffer[0], &data->delay_line[channel * data->delay], | |
| frame_length * sizeof(PCM_DEC)); | |
| FDKmemcpy(&data->delay_line[channel * data->delay], | |
| &data->delay_line[channel * data->delay + frame_length], | |
| (data->delay - frame_length) * sizeof(PCM_DEC)); | |
| FDKmemcpy(&data->delay_line[channel * data->delay + | |
| (data->delay - frame_length)], | |
| tmp, frame_length * sizeof(PCM_DEC)); | |
| } | |
| C_ALLOC_SCRATCH_END(tmp, PCM_DEC, 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; | |
| } |