This directory contains the FAAD2 AAC decoder library, which is capable of decoding AAC audio streams. The library supports various AAC profiles, including LC (Low Complexity), HE-AAC (High Efficiency AAC). But HE-AAC v2 is not supported.
The original source code comes from FAAD2 2.8.8
| Directory | Description |
|---|---|
| audio | Audio files used to test |
| bin | Binaries to generate reference results |
| data | Pre-generated test data |
| faad2 | FAAD2 source files |
Please refer to the Prerequisites section in the parent directory's README.
Switch to the AAC/faad2 directory containing the Makefile.
Ensure that the Nuclei SDK is properly set up and the NUCLEI_SDK_ROOT environment
variable is configured.
Below are build examples for the Nuclei N300 CPU.
make CORE=n300 ARCH_EXT= allBuild with extra B and P extensions:
make CORE=n300 ARCH_EXT=_zba_zbb_zbc_zbs_xxldspn3x allFor details about Nuclei CPU architecture extensions, see the ARCH_EXT section
Codec performance depends on the input audio data. To test with different audio files, a helper script is provided:
Note
This script is only supported on Linux x86_64
It relies on prebuilt binaries (encoder/decoder) available only for x86_64.
You may also build these binaries yourself if needed.
And one more thing, the run results on RISC-V platform are not bit-exact with x86_64.
To view usage details:
./bin/gendata.sh -hA typical output looks like this:
The key results are prefixed with CSV, making them easy to parse in scripts
for further analysis.
The performance metric is reported in MCPS (Million Cycles Per Second), which represents the number of CPU cycles required to process one second of audio data.