bell's Introduction

bell

Core audio utils library used in cspot and euphonium projects.

What's included:

HTTPServer, HTTPClient - no need to explain
BufferedStream - wrapper for ByteStream with a worker-thread ring buffer
Crypto (openssl and mbedtls backed)
Audio sinks interface:
- for Unix/Cygwin: ALSA, PortAudio, named pipe outputs (see root CMakeLists for options)
- for ESP32: DACs (AC101, ES8388, ES9018, PCM5102, TAS5711), S/PDIF over I2S, internal DAC output
- → see src/audio/sinks/esp for pin configuration, etc.
Abstraction layer over multiple audio codecs: (disable with BELL_DISABLE_CODECS)
- AAC - using libhelix-aac - enabled with BELL_CODEC_AAC
- MP3 - using libhelix-mp3 - enabled with BELL_CODEC_MP3
- Vorbis - using Xiph.org's tremor - enabled with BELL_CODEC_VORBIS
- Opus - using Xiph.org's reference Opus impl - enabled with BELL_CODEC_OPUS
Audio container reading classes, with random access support:
- Mpeg4Container - supports MPEG-4 and QuickTime files, either with or without video, fragmented or not
cJSON library with JSONObject wrapper (disable with BELL_DISABLE_CJSON)
Logging utilities
Nanopb protobuf library, for use in CMake
Semaphore implementations for multiple platforms

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