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Andrey Semashev authored
Advanced Audio Coding (AAC) is a lossy audio codec, which implements a number of audio encoding tools and provides good audio quality at relatively low bitrate. It is standardized as ISO/IEC 13818-7 (a.k.a. MPEG-2 Part 7) and ISO/IEC 14496-3 (a.k.a. MPEG-4 Part 3) specifications. It has gained wide adoption, including in Bluetooth A2DP devices. Bluetooth A2DP specification standardizes the following AAC profiles: - MPEG-2 AAC Low Complexity (AAC LC) - MPEG-4 AAC LC - MPEG-4 AAC Long Term Prediction (AAC LTP) - MPEG-4 AAC Scalable The former 3 are supported by this new PulseAudio codec for both decoding and encoding. AAC decoder is implemented in ffmpeg/libavcodec as a built-in decoder. AAC encoder is implemented in ffmpeg/libavcodec in two variants: - built-in encoder, which is available since ffmpeg 3.0 (we require ffmpeg 3.1 because it introduces the modern API for working with codecs) - optional encoder backed by libfdk-aac The A2DP codec is...
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