Click here to Skip to main content
Click here to Skip to main content
 
Add your own
alternative version
Go to top

AAC Encode

, 17 Feb 2012
Raw Audio data is encoded to AAC compression using ffmmpeg library.
AACEncode.zip
AACEncode
yakcodec.ncb
yakcodec.sln.old
yakcodec.suo
yakcodec.suo.old
yakcodec
include
libavcodec
libavdevice
libavfilter
libavformat
libavutil
libpostproc
libswresample
libswscale
lib
avcodec.lib
avconv.exe
avdevice.lib
avdevice-53.dll
avfilter.lib
avfilter-2.dll
avformat.lib
avformat-53.dll
avutil.lib
avutil-51.dll
libopencore-amrnb.a
libopencore-amrwb.a
libportaudio.dll.a
libportaudio-2.dll
libportaudio-2.lib
postproc.lib
postproc-51.dll
swresample.lib
swresample-0.dll
swscale.lib
swscale-2.dll
licenses
yakcodec.suo
yakcodec.vcproj.POTLURI.suresh.user
yakcodec.vcxproj.filters
yakcodec.vcxproj.user
/*
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef AVCODEC_AVFFT_H
#define AVCODEC_AVFFT_H

typedef float FFTSample;

typedef struct FFTComplex {
    FFTSample re, im;
} FFTComplex;

typedef struct FFTContext FFTContext;

/**
 * Set up a complex FFT.
 * @param nbits           log2 of the length of the input array
 * @param inverse         if 0 perform the forward transform, if 1 perform the inverse
 */
FFTContext *av_fft_init(int nbits, int inverse);

/**
 * Do the permutation needed BEFORE calling ff_fft_calc().
 */
void av_fft_permute(FFTContext *s, FFTComplex *z);

/**
 * Do a complex FFT with the parameters defined in av_fft_init(). The
 * input data must be permuted before. No 1.0/sqrt(n) normalization is done.
 */
void av_fft_calc(FFTContext *s, FFTComplex *z);

void av_fft_end(FFTContext *s);

FFTContext *av_mdct_init(int nbits, int inverse, double scale);
void av_imdct_calc(FFTContext *s, FFTSample *output, const FFTSample *input);
void av_imdct_half(FFTContext *s, FFTSample *output, const FFTSample *input);
void av_mdct_calc(FFTContext *s, FFTSample *output, const FFTSample *input);
void av_mdct_end(FFTContext *s);

/* Real Discrete Fourier Transform */

enum RDFTransformType {
    DFT_R2C,
    IDFT_C2R,
    IDFT_R2C,
    DFT_C2R,
};

typedef struct RDFTContext RDFTContext;

/**
 * Set up a real FFT.
 * @param nbits           log2 of the length of the input array
 * @param trans           the type of transform
 */
RDFTContext *av_rdft_init(int nbits, enum RDFTransformType trans);
void av_rdft_calc(RDFTContext *s, FFTSample *data);
void av_rdft_end(RDFTContext *s);

/* Discrete Cosine Transform */

typedef struct DCTContext DCTContext;

enum DCTTransformType {
    DCT_II = 0,
    DCT_III,
    DCT_I,
    DST_I,
};

/**
 * Set up DCT.
 * @param nbits           size of the input array:
 *                        (1 << nbits)     for DCT-II, DCT-III and DST-I
 *                        (1 << nbits) + 1 for DCT-I
 *
 * @note the first element of the input of DST-I is ignored
 */
DCTContext *av_dct_init(int nbits, enum DCTTransformType type);
void av_dct_calc(DCTContext *s, FFTSample *data);
void av_dct_end (DCTContext *s);

#endif /* AVCODEC_AVFFT_H */

By viewing downloads associated with this article you agree to the Terms of Service and the article's licence.

If a file you wish to view isn't highlighted, and is a text file (not binary), please let us know and we'll add colourisation support for it.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Share

About the Author

potluri_suresh
Software Developer (Senior) 3k Techonologies
United States United States
Suresh Potluri has worked in Windows device drivers, Solid experience in NDIS Layer, developed many NDIS Miniport drivers. Extensive experience in developing NDIS miniport drivers, building WHQL/DTM setup, clearing all WHQL/DTM tests, and subsequently getting device signature/logo process for the developed drivers. He also was also solely responsible for debugging traps and blue screens for a number of years.
he also worked on many PCI based boards, developed Board support packages, Vx-Works firmware for Power PC, firmware for ARM based boards for Wireless LAN devices.
 
he is interested in Embedded, NDIS, MPEG.
 
Previously worked in Tandberg TV, Sunnyvale, Chlesio Communications, Sunnyvale, Hellosoft, Hyderabad.

| Advertise | Privacy | Mobile
Web04 | 2.8.140926.1 | Last Updated 18 Feb 2012
Article Copyright 2012 by potluri_suresh
Everything else Copyright © CodeProject, 1999-2014
Terms of Service
Layout: fixed | fluid