Microchip Compact MP3
Decoder Library
User’s Guide
2012 Microchip Technology Inc.
DS70688B
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ISBN: 978-1-62076-676-7
QUALITY MANAGEMENT SYSTEM CERTIFIED BY DNV == ISO/TS 16949 == DS70688B-page 2
Microchip received ISO/TS-16949:2009 certification for its worldwide
headquarters, design and wafer fabrication facilities in Chandler and
Tempe, Arizona; Gresham, Oregon and design centers in California
and India. The Company’s quality system processes and procedures
are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping
devices, Serial EEPROMs, microperipherals, nonvolatile memory and
analog products. In addition, Microchip’s quality system for the design
and manufacture of development systems is ISO 9001:2000 certified.
2012 Microchip Technology Inc.
MICROCHIP COMPACT MP3
DECODER LIBRARY USER’S GUIDE
Table of Contents
Chapter 1. Introduction
1.1 MP3 Overview ................................................................................................ 9
1.2 Microchip MP3 Implementation ...................................................................... 9
1.3 Microchip Compact MP3 Decoder Features ................................................ 10
Chapter 2. Library Resources
2.1 Resources .................................................................................................... 11
2.2 Resource Usage ........................................................................................... 11
Chapter 3. Application Programming Interface (API)
3.1 PIC32 MP3 Decoder API Functions ............................................................. 13
Appendix A. License Agreement
2012 Microchip Technology Inc.
DS70688B-page 3
Microchip Compact MP3 Decoder Library User’s Guide
NOTES:
DS70688B-page 4
2012 Microchip Technology Inc.
MICROCHIP COMPACT MP3
DECODER LIBRARY USER’S GUIDE
Preface
NOTICE TO CUSTOMERS
All documentation becomes dated, and this manual is no exception. Microchip tools and
documentation are constantly evolving to meet customer needs, so some actual dialogs
and/or tool descriptions may differ from those in this document. Please refer to our web site
(www.microchip.com) to obtain the latest documentation available.
Documents are identified with a “DS” number. This number is located on the bottom of each
page, in front of the page number. The numbering convention for the DS number is
“DSXXXXXA”, where “XXXXX” is the document number and “A” is the revision level of the
document.
For the most up-to-date information on development tools, see the MPLAB® X IDE online help.
Select the Help menu, and then Topics to open a list of available online help files.
INTRODUCTION
This chapter contains general information that will be useful to know before you use the
Microchip Compact MP3 Decoder Library. Items discussed in this Preface include:
•
•
•
•
•
•
•
•
•
Document Layout
Conventions Used in this Guide
Warranty Registration
License Agreement
Recommended Reading
The Microchip Web Site
Development Systems Customer Change Notification Service
Customer Support
Document Revision History
DOCUMENT LAYOUT
This document describes how to use the Microchip Compact MP3 Decoder Library with
the PIC32 family of devices. The document layout is as follows:
• Chapter 1. “Introduction” – This chapter provides an overview of the Microchip
Compact MP3 Decoder Library.
• Chapter 2. “Library Resources” – This chapter describes the resources
available for the Microchip Compact MP3 Decoder Library.
• Chapter 3. “Application Programming Interface (API)” – This chapter outlines
how the API functions provided in the Microchip Compact MP3 Decoder Library
can be included in your application software via the Application Programming
Interface.
2012 Microchip Technology Inc.
DS70688B-page 5
Microchip Compact MP3 Decoder Library User’s Guide
CONVENTIONS USED IN THIS GUIDE
This manual uses the following documentation conventions:
DOCUMENTATION CONVENTIONS
Description
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Examples
Referenced books
MPLAB® IDE User’s Guide
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...is the only compiler...
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select Enable Programmer
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file.o, where file can be any
valid filename
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arguments; an OR selection
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Represents code supplied by
user
void main (void)
{ ...
}
Notes
DS70688B-page 6
Represents
A Note presents information
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Note:
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CAUTION
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Note 1: This is a note used in a
table.
2012 Microchip Technology Inc.
Preface
WARRANTY REGISTRATION
Please complete the enclosed Warranty Registration Card and mail it promptly.
Sending in the Warranty Registration Card entitles you to receive new product updates.
Interim software releases are available at the Microchip web site.
LICENSE AGREEMENT
Supply of this product does not convey a license under the relevant intellectual property
of Thomson and/or Fraunhofer Gesellschaft nor imply any right to use this product in
any finished end user or ready-to-use final product. An independent license for such
use is required. For details, please visit http://www.mp3licensing.com.
RECOMMENDED READING
This user’s guide describes how to use the Microchip Compact MP3 Decoder Library.
The following are available and recommended as supplemental reference resources.
PIC32 Family Reference Manual Sections
Family Reference Manual sections are available, which explain the operation of the
PIC32 device family architecture and peripheral modules. The specifics of each device
family are discussed in the individual family’s device data sheet.
MPLAB® XC32 C/C++ Compiler User’s Guide (DS51686)
This document details the use of Microchip’s MPLAB XC32 Compiler for PIC32
microcontrollers to develop 32-bit applications.
MPLAB® X IDE User’s Guide (DS52027)
Consult this document for more information pertaining to the installation and
implementation of the MPLAB X IDE software.
THE MICROCHIP WEB SITE
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distributors and factory representatives
2012 Microchip Technology Inc.
DS70688B-page 7
Microchip Compact MP3 Decoder Library User’s Guide
DEVELOPMENT SYSTEMS CUSTOMER CHANGE NOTIFICATION SERVICE
Microchip’s customer notification service helps keep customers current on Microchip
products. Subscribers will receive e-mail notification whenever there are changes,
updates, revisions or errata related to a specified product family or development tool of
interest.
To register, access the Microchip web site at www.microchip.com, click on Customer
Change Notification and follow the registration instructions.
The Development Systems product group categories are:
• Compilers – The latest information on Microchip C compilers and other language
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• Emulators – The latest information on the Microchip in-circuit emulator, MPLAB
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• In-Circuit Debuggers – The latest information on the Microchip in-circuit
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• MPLAB X IDE – The latest information on Microchip MPLAB X IDE, the
Windows® Integrated Development Environment for development systems tools
• Programmers – The latest information on Microchip programmers including the
PICkit™ 3 development programmer
CUSTOMER SUPPORT
Users of Microchip products can receive assistance through several channels:
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Technical Support
Customers should contact their distributor, representative or field application engineer
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Technical support is available through the web site at:
http://www.microchip.com/support
DOCUMENT REVISION HISTORY
Revision A (October 2012)
This is the initial released version of this document.
Revision B (November 2012)
In this revision, the Performance and Resource Consumption for Microchip Compact
MP3 Decoder Library table was updated (Table 2-1).
DS70688B-page 8
2012 Microchip Technology Inc.
MICROCHIP COMPACT MP3
DECODER LIBRARY USER’S GUIDE
Chapter 1. Introduction
Thank you for purchasing the Microchip Compact MP3 Decoder Library, which can be
used with Microchip’s PIC32 family of devices, and provides the ability to decode MP3
audio.
1.1
MP3 OVERVIEW
MP3 is a compression format for storing digital audio data. It is an audio codec that has
the capability to compress the original audio source with minor loss in sound quality.
The higher the compression ratio, the lower the quality. Therefore, there is a balancing
act between file size and audio quality. With the right combination, MP3 encoded data
can provide very high quality audio.
One of the advantages of MP3 audio is that it can be separated into segments. Each
segment is independent and may be decoded or played. This feature makes it a very
attractive scheme for streaming audio.
MP3 encoding uses psychoacoustic principles. This is a catch-all term for the way
sound is perceived psychologically and physiologically by humans. The human ear can
nominally hear sounds in the range of 20 Hz to 20,000 Hz, although with age the higher
frequencies may be inaudible. One of the principles applied in encoding is to limit the
high frequency information, especially at low bit rates. The threshold of sound
perception varies with frequency. A low level sound at high frequencies may be
inaudible or may add little to the musical experience. In some situations, an otherwise
clearly audible sound can be masked by another sound of higher intensity.
The MP3 encoder evaluates the perceptual experience loss to the listener by analyzing
various such phenomena and makes a qualitative judgment based on the chosen
compression rate (bit rate). Alternatively, you may choose a Variable Bit Rate (VBR)
and the encoder makes a decision on the bit rate for every frame based on the amount
of information that is contained.
The task of the decoder is to take the compressed data and produce the decompressed
audio on a frame-by-frame basis.
1.2
MICROCHIP MP3 IMPLEMENTATION
Table 1-1 shows the different audio layers that use the .mp3 file type. The Microchip
Compact MP3 Decoder Library implements the MPEG-1, Audio Layer III, which has
been approved in the ISO/IEC 11172-3 standard.
TABLE 1-1:
MP3 DECODER SUPPORT MATRIX
Encoding Format
Layer I
Layer II
Layer III
MPEG-1 (Fs = 32, 44.1, 48 kHz)
No
No
Yes
MPEG-2 (Fs = 16, 22.05, 24 kHz)
No
No
No
MPEG-2.5 (Fs = 8, 11.025, 12 kHz)
No
No
No
2012 Microchip Technology Inc.
DS70688B-page 9
Microchip Compact MP3 Decoder Library User’s Guide
1.3
MICROCHIP COMPACT MP3 DECODER FEATURES
•
•
•
•
•
Implements MPEG-1, Audio Layer III decoder (ISO/IEC 11172-3)
Simple user interface – initialize decoder and pass MP3 data
Optimized C callable APIs
Assembly optimized implementation for overall performance
Supported sampling rates:
- 32 kHz
- 44.1 kHz
- 48 kHz
• Supported bit rates (kbps):
- 32
- 40
- 48
- 56
- 64
- 80
- 96
- 112
- 128
- 160
- 192
- 224
- 256
- 320
- Variable Bit Rate (VBR)
DS70688B-page 10
2012 Microchip Technology Inc.
MICROCHIP COMPACT MP3
DECODER LIBRARY USER’S GUIDE
Chapter 2. Library Resources
This chapter provides information on the available resources for the Microchip
Compact MP3 Decoder Library.
Topics covered include:
• Resources
• Resource Usage
2.1
RESOURCES
Several resources related to the Microchip Compact MP3 Decoder Library are
available from Microchip:
• Hex file for the specific hardware resource
• Library binary archive (SW320002-1)
• Library source (SW320002-2)
The Microchip Compact MP3 Decoder Library can be used as a software resource with
your hardware, or with many of Microchip's PIC32 family device hardware resources.
Due to many hardware resources, and to conserve space, the related installation and
demonstration procedures are not listed in this document.
To locate the related installation instructions and demonstration files and procedures
for your hardware, refer to the main Microchip web page for your specific board.
Note:
2.2
If you are accessing the information for the specific hardware resource from
microchipDIRECT, click the More Info link to access the main web page for
the board.
RESOURCE USAGE
TABLE 2-1:
Peak MIPS
PERFORMANCE AND RESOURCE CONSUMPTION FOR
MICROCHIP COMPACT MP3 DECODER LIBRARY
Code Size (Kbytes)
Data Size (Kbytes)
~29 Total
27.1
Note:
2012 Microchip Technology Inc.
45.58
Decoder State (Heap)
10.76
I/O Buffers
12
Stack
5.4
Tested with CD quality 44.1 kHz, 128 kbps encoded data.
DS70688B-page 11
Microchip Compact MP3 Decoder Library User’s Guide
NOTES:
DS70688B-page 12
2012 Microchip Technology Inc.
MICROCHIP COMPACT MP3
DECODER LIBRARY USER’S GUIDE
Chapter 3. Application Programming Interface (API)
This chapter describes the Application Programming Interface (API) to the Microchip
Compact MP3 Decoder Library. The prototype declaration of the API functions, the
state buffer used, and the buffer sizes for the audio are located in the header file,
MP3Decoder.h.
3.1
PIC32 MP3 DECODER API FUNCTIONS
This section lists and describes the following three API functions that are available in
the Microchip Compact MP3 Decoder Library:
• MP3GetStateSize
• MP3Initialize
• MP3Decode
MP3GetStateSize
Description
This function gets the size of the MP3 state buffer. Based on the return value, the
application allocates the required memory for the MP3 Decoder state. If dynamic
memory allocation (malloc) is not used, this function need not be called and the MP3
Decoder state buffer shall be statically defined at compile time with the size of the MP3
Decoder state structure.
Prototype
unsigned short int MP3GetStateSize(void);
Arguments
None.
Return Values
Size of MP3 Decoder state structure size.
2012 Microchip Technology Inc.
DS70688B-page 13
Microchip Compact MP3 Decoder Library User’s Guide
MP3Initialize
Description
This function initializes the MP3 Decoder state with the default values.
Prototype
BOOL MP3Initialize ( void *state );
Arguments
*state
Pointer to the allocated state memory
Return Values
TRUE/FALSE
DS70688B-page 14
2012 Microchip Technology Inc.
Application Programming Interface (API)
MP3Decode
Description
This function decodes a frame of MP3 data.
Prototype
BOOL MP3Decode (void *state, unsigned char *inBuff, unsigned short
int inSize, unsigned short int *used, MP3_FORMAT *format, unsigned
char *outBuff, unsigned short int *outSize);
In the following example, MP3_FORMAT is the following structure:
typedef struct
{
unsigned short int bitRate;
unsigned short int sampleRate;
unsigned char bitsPerSample;
unsigned char channels;
}
Arguments
*state
Pointer to the allocated state memory
*inBuff
Pointer to input buffer that contains the encoded bit stream
inSize
Number of valid bytes in the input buffer
*used
Pointer to the number of bytes consumed in the current frame
*format
Pointer to the channel information structure
*outBuffer
Pointer to output buffer that contains decoded PCM samples
*outsize
Pointer to the number of valid bytes in the output buffer
Return Values
TRUE/FALSE
2012 Microchip Technology Inc.
DS70688B-page 15
Microchip Compact MP3 Decoder Library User’s Guide
NOTES:
DS70688B-page 16
2012 Microchip Technology Inc.
MICROCHIP COMPACT MP3
DECODER LIBRARY USER’S GUIDE
Appendix A. License Agreement
License Agreement
Supply of this product does not convey a license under the relevant intellectual property of Thomson
and/or Fraunhofer Gesellschaft nor imply any right to use this product in any finished end user or
ready-to-use final product. An independent license for such use is required. For details, please visit
http://www.mp3licensing.com.
2012 Microchip Technology Inc.
DS70688B-page 17
Microchip Compact MP3 Decoder Library User’s Guide
NOTES:
DS70688B-page 18
2012 Microchip Technology Inc.
NOTES:
2012 Microchip Technology Inc.
DS70688B-page 19
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