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Diffstat (limited to 'libAACdec/src/FDK_delay.cpp')
| -rw-r--r-- | libAACdec/src/FDK_delay.cpp | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/libAACdec/src/FDK_delay.cpp b/libAACdec/src/FDK_delay.cpp new file mode 100644 index 0000000..0ab1a66 --- /dev/null +++ b/libAACdec/src/FDK_delay.cpp @@ -0,0 +1,173 @@ +/* ----------------------------------------------------------------------------- +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; +} |