arduino-audio-tools
Public Member Functions | Protected Member Functions | Protected Attributes | List of all members
MP3DecoderMini Class Reference

MP3 Decoder using https://github.com/pschatzmann/minimp3. This decoder does not provide any good results and it is not suited to decode any audio above 32000 on an ESP32. So the sample rate is limited by the MINIMP3_MAX_SAMPLE_RATE variable. More...

#include <CodecMP3Mini.h>

Inheritance diagram for MP3DecoderMini:
AudioDecoder AudioWriter AudioInfoSource

Public Member Functions

 ~MP3DecoderMini ()
 Destroy the MP3DecoderMini object.
 
AudioInfo audioInfo ()
 Provides the last available MP3FrameInfo.
 
void begin ()
 Starts the processing.
 
virtual void begin (AudioInfo info)
 
void end ()
 Releases the reserved memory.
 
void flush ()
 Decodes the last outstanding data.
 
virtual bool isResultPCM ()
 If true, the decoding result is PCM data.
 
virtual operator bool ()
 checks if the class is active
 
virtual void setAudioInfo (AudioInfo from) override
 for most decoders this is not needed
 
void setBufferLength (int len)
 
void setNotifyAudioChange (AudioInfoSupport &bi)
 Registers an object that is notified if the audio format is changing.
 
virtual void setOutput (AudioOutput &out_stream)
 Defines where the decoded result is written to.
 
virtual void setOutput (AudioStream &out_stream)
 Defines where the decoded result is written to.
 
void setOutput (Print &outStream)
 Defines the output Stream.
 
void setSampleRateLimit (int limit)
 
size_t write (const void *data, size_t len)
 Write mp3 data to decoder.
 

Protected Member Functions

void decode (int write_len)
 Process single bytes so that we can decode a full frame when it is available.
 
void f32_to_s16 (float *in, int16_t *out, int num_samples)
 
void provideResult (int samples)
 Provides Metadata and PCM data.
 
void writeBlocking (Print *out, uint8_t *data, size_t len)
 

Protected Attributes

bool active
 
AudioInfo audio_info
 
AudioInfoSupportaudioBaseInfoSupport = nullptr
 
Vector< uint8_t > buffer
 
size_t buffer_pos = 0
 
size_t buffer_size = 5 * 1024
 
AudioInfo info
 
mp3dec_t mp3d
 
mp3dec_frame_info_t mp3dec_info
 
Printout = nullptr
 
AudioInfoSupportp_notify = nullptr
 
Printp_print = nullptr
 
Vector< mp3d_sample_t > pcm
 
int sample_rate_limit = 44100
 

Detailed Description

MP3 Decoder using https://github.com/pschatzmann/minimp3. This decoder does not provide any good results and it is not suited to decode any audio above 32000 on an ESP32. So the sample rate is limited by the MINIMP3_MAX_SAMPLE_RATE variable.

Author
Phil Schatzmann

The documentation for this class was generated from the following file: