Multimedia Library: Audio Processing
This library cluster has 43 classes.
ECF: multi-media.ecf
Classes for processing audio files and sample data.
Directory: library/multimedia/audio
command
EL_AUDIO_COMMAND_FACTORY
Audio command factory accessible via EL_MODULE_AUDIO_COMMAND
EL_AUDIO_PROPERTIES_COMMAND_I
Audio properties command i
EL_AVCONV_OS_COMMAND_I
Selects between commands avconv and ffmpeg depending on what's installed
EL_EXTRACT_MP3_INFO_COMMAND_I
Extract mp3 info command i
EL_MP3_TO_WAV_CLIP_SAVER_COMMAND_I
Mp3 to wav clip saver command i
EL_WAV_FADER_I
Wav fader i
EL_WAV_GENERATION_COMMAND_I
Wrapper for swgen test signal generation command It generates 1 second of audio signal sweeping from frequency_lower to frequency_lower at cycles_per_sec times per second
See: swgen maunal
Further Information
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EL_WAV_TO_MP3_COMMAND_I
Wav to mp3 command
file/mp3
EL_MP3_AUDIO_SIGNATURE_READER
MP3 audio signature reader
Further Information
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EL_MP3_IDENTIFIER
MP3 identifier
Further Information
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EL_MPEG_HEADER
MPEG file header
file/sample
EL_MONO_UNITIZED_SAMPLE_FILE
Mono unitized sample file
EL_WAVE_SAMPLE_FILE
Wave sample file
EL_WAVE_SAMPLE_FILE_ABS
Wave sample file abs
file/wav
EL_AUDIO_WAVE_HEADER
Audio wave header
EL_FIXED_DEPTH_WAVE_FILE
Fixed depth wave file
EL_WAVEFORM_FORMAT_ABS
Waveform format abs
EL_WAVE_FILE
Wave file
EL_WAV_FORMAT_CHUNK
Wav format chunk
EL_WAV_FORMAT_CONSTANTS
Wav format constants
imp_common
EL_AUDIO_PROPERTIES_COMMAND_IMP
Implementation of EL_AUDIO_PROPERTIES_COMMAND_I interface
EL_EXTRACT_MP3_INFO_COMMAND_IMP
Implementation of EL_EXTRACT_MP3_INFO_COMMAND_I interface
EL_MP3_TO_WAV_CLIP_SAVER_COMMAND_IMP
Implementation of EL_MP3_TO_WAV_CLIP_SAVER_COMMAND_I interface
EL_WAV_FADER_IMP
Implementation of EL_WAV_FADER_I interface
EL_WAV_GENERATION_COMMAND_IMP
Implementation of EL_WAV_GENERATION_COMMAND_I interface
Further Information
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EL_WAV_TO_MP3_COMMAND_IMP
Implementation of EL_WAV_TO_MP3_COMMAND_I interface
processing
EL_AUDIO_IO_MEDIUM
Audio sample source for processing with EL_AUDIO_SAMPLE_PROCESSOR
EL_AUDIO_RMS_ENERGY
Audio rms energy
EL_AUDIO_SAMPLE_PROCESSOR
Audio sample processor
EL_AUDIO_SEGMENT_PARAMS
Audio segment params
EL_SEGMENTING_AUDIO_PROCESSOR
Processes audio in manageable segments separated by silence (low signal)
sample
EL_16_BIT_AUDIO_PCM_SAMPLE
16 bit audio pcm sample
Further Information
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EL_32_BIT_AUDIO_PCM_SAMPLE
32 bit audio pcm sample
EL_8_BIT_AUDIO_PCM_SAMPLE
8-bit PCM data contained in WAV files is usually stored as unsigned numbers, whereas the LM4549 codec (and most 16-bit WAV files) work with signed quantities. Attempting to play unsigned samples directly will produce a horribly distorted waveform. Thus, when playing unsigned sample data, an offset which corresponds to the mid-point value must be deducted from each sample value. For 8-bit unsigned values, this offset is 0x7F
NOTES: not tested but should work
EL_AUDIO_PCM_SAMPLE
Audio PCM sample
sample/list
EL_16_BIT_AUDIO_SAMPLE_ARRAYED_LIST
16 bit audio sample arrayed list
EL_AUDIO_SAMPLE_ARRAYED_LIST
Audio sample arrayed list
EL_AUDIO_SAMPLE_LIST
Audio sample list
sample/memory
EL_AUDIO_SAMPLE_MEMORY_LIST
Audio sample memory list
EL_MULTICHANNEL_AUDIO_UNIT_SAMPLE_ARRAY
Multichannel audio unit sample array
EL_PCM_SAMPLE_BLOCK_ARRAY
Pcm sample block array
shared
EL_MODULE_AUDIO_COMMAND
Shared access to instance of EL_AUDIO_COMMAND_FACTORY
Further Information
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EL_MULTIMEDIA_CONSTANTS
Multimedia constants
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