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FAQ - SPEEX
FAQ. Vorbis is open-source and patent-free; why do we need Speex? Vorbis is a great project but its goals are not the same as Speex. Vorbis is mostly aimed at compressing music and audio in general, while Speex targets speech only.SPEEX LICENSE
Speex License. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: Redistributions of source code must retain the above copyright notice, this list of conditions and the followingdisclaimer.
SPEEX: MAIN PAGE
Speex Documentation. 1.2-beta2 . Generated on Wed May 23 00:53:16 2007 for Speex by 1.5.1 1.5.1 SPEEX: CLASS MEMBERS Generated on Wed May 23 00:53:16 2007 for Speex by 1.5.1 1.5.1 SPEEX: SPEEXHEADER: MAKES IT EASY TO WRITE/PARSE AN OGG Detailed Description This is the Speex header for the Ogg encapsulation. You don't need that if you just use RTP.IETF RTP PROFILE
IETF RTP Profile AVT G. Herlein Internet-Draft Intended status: Standards Track J. Valin Expires: October 24, 2007 University of Sherbrooke A. Heggestad April 22, 2007 RTP Payload Format for the Speex Codec draft-ietf-avt-rtp-speex-01 (non-final) Status of this Memo By submitting this Internet-Draft, each author represents that any applicable patent or other IPR claims of which he or she is SPEEX: JITTERBUFFER: ADAPTIVE JITTER BUFFER Detailed Description This is the jitter buffer that reorders UDP/RTP packets and adjusts the buffer size to maintain good quality and lowlatency.
THE SPEEX CODEC MANUAL VERSION 1.2 BETA 2 The Speex Codec ManualVersion 1.2 Beta 2. The Speex Codec Manual. Version 1.2 Beta 2. Vorbis is open-source and patent-free; why do we need Speex? Isn't there an open-source implementation of the GSM-FR codec? Why is Speex necessary? Under what license is Speex released? Am I allowed to use Speex in commercial software? FORMATS AND STANDARDS Formats and standards. Speex can encode speech in both narrowband and wideband and provides different bit-rates. However, not all features need to be supported by a certain implementation or device. In order to be called ``Speex compatible'' (whatever that means), an implementation must implement at least a basic set of features. SPEEX: SPEEX ENCODER AND DECODER Uses an existing encoder state to encode one frame of speech pointed to by "in". The encoded bit-stream is saved in "bits". Frees all resources associated to an existing Speex encoder state. Returns a handle to a newly created Speex encoder state structure. For now, the "mode" argument can be &nb_mode or &wb_mode .FAQ - SPEEX
FAQ. Vorbis is open-source and patent-free; why do we need Speex? Vorbis is a great project but its goals are not the same as Speex. Vorbis is mostly aimed at compressing music and audio in general, while Speex targets speech only.SPEEX LICENSE
Speex License. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: Redistributions of source code must retain the above copyright notice, this list of conditions and the followingdisclaimer.
SPEEX: MAIN PAGE
Speex Documentation. 1.2-beta2 . Generated on Wed May 23 00:53:16 2007 for Speex by 1.5.1 1.5.1 SPEEX: CLASS MEMBERS Generated on Wed May 23 00:53:16 2007 for Speex by 1.5.1 1.5.1 SPEEX: SPEEXHEADER: MAKES IT EASY TO WRITE/PARSE AN OGG Detailed Description This is the Speex header for the Ogg encapsulation. You don't need that if you just use RTP.IETF RTP PROFILE
IETF RTP Profile AVT G. Herlein Internet-Draft Intended status: Standards Track J. Valin Expires: October 24, 2007 University of Sherbrooke A. Heggestad April 22, 2007 RTP Payload Format for the Speex Codec draft-ietf-avt-rtp-speex-01 (non-final) Status of this Memo By submitting this Internet-Draft, each author represents that any applicable patent or other IPR claims of which he or she is SPEEX: JITTERBUFFER: ADAPTIVE JITTER BUFFER Detailed Description This is the jitter buffer that reorders UDP/RTP packets and adjusts the buffer size to maintain good quality and lowlatency.
SPEEX: CLASS MEMBERS Here is a list of all documented file members with links to the documentation: - d - decode_func : speex.h decoder_ctl_func : speex.h decoder_destroy_func : speex.h decoder_init_func : FORMATS AND STANDARDS Formats and standards. Speex can encode speech in both narrowband and wideband and provides different bit-rates. However, not all features need to be supported by a certain implementation or device. In order to be called ``Speex compatible'' (whatever that means), an implementation must implement at least a basic set of features.SPEEX: CLASS LIST
Speex Class List. Here are the classes, structs, unions and interfaces with brief descriptions: SPEEX: CLASS MEMBERS Generated on Wed May 23 00:53:16 2007 for Speex by 1.5.1 1.5.1 SPEEX: INCLUDE/SPEEX/ DIRECTORY REFERENCE Speex preprocessor. The preprocess can do noise suppression, residual echo suppression (after using the echo canceller), automatic gain control (AGC) and voice activity detection (VAD). file. speex_resampler.h file. speex_stereo.h Describes the handling for intensity stereo. file. speex_types.hSPEEX: MAIN PAGE
Speex Documentation. 1.2-beta2 . Generated on Wed May 23 00:53:16 2007 for Speex by 1.5.1 1.5.1 SPEEX: SPEEXMODE STRUCT REFERENCE Pointer to the mode query function. const char* SpeexMode::modeName. The name of the mode (you should not rely on this to identify the mode) int SpeexMode::modeID. ID of the mode. int SpeexMode::bitstream_version. Version number of the bitstream (incremented every time we break bitstream compatibility. encoder_init_func SpeexMode::enc_init. SPEEX: SPEEXHEADER STRUCT REFERENCE spx_int32_t SpeexHeader::extra_headers. Number of additional headers after the comments. spx_int32_t SpeexHeader::reserved1. Reserved for future use, must be zero. spx_int32_t SpeexHeader::reserved2. Reserved for future use, must be zero. The documentation for this struct was generated from the following file: speex_header.h. SPEEX: SPEEX.H SOURCE FILE Generated on Wed May 23 00:53:16 2007 for Speex by 1.5.1 1.5.1 SPEEX: SPEEX_TYPES.H SOURCE FILE Generated on Wed May 23 00:53:16 2007 for Speex by 1.5.1 1.5.1 THE SPEEX CODEC MANUAL VERSION 1.2 BETA 2 The Speex Codec ManualVersion 1.2 Beta 2. The Speex Codec Manual. Version 1.2 Beta 2. Vorbis is open-source and patent-free; why do we need Speex? Isn't there an open-source implementation of the GSM-FR codec? Why is Speex necessary? Under what license is Speex released? Am I allowed to use Speex in commercial software?SPEEX: CLASS LIST
Speex Class List. Here are the classes, structs, unions and interfaces with brief descriptions: FORMATS AND STANDARDS Formats and standards. Speex can encode speech in both narrowband and wideband and provides different bit-rates. However, not all features need to be supported by a certain implementation or device. In order to be called ``Speex compatible'' (whatever that means), an implementation must implement at least a basic set of features.SPEEX: MAIN PAGE
Speex Documentation. 1.2-beta2 . Generated on Wed May 23 00:53:16 2007 for Speex by 1.5.1 1.5.1 SPEEX: SPEEX ENCODER AND DECODER Uses an existing encoder state to encode one frame of speech pointed to by "in". The encoded bit-stream is saved in "bits". Frees all resources associated to an existing Speex encoder state. Returns a handle to a newly created Speex encoder state structure. For now, the "mode" argument can be &nb_mode or &wb_mode .FAQ - SPEEX
FAQ. Vorbis is open-source and patent-free; why do we need Speex? Vorbis is a great project but its goals are not the same as Speex. Vorbis is mostly aimed at compressing music and audio in general, while Speex targets speech only. SPEEX: SPEEXMODE STRUCT REFERENCE Pointer to the mode query function. const char* SpeexMode::modeName. The name of the mode (you should not rely on this to identify the mode) int SpeexMode::modeID. ID of the mode. int SpeexMode::bitstream_version. Version number of the bitstream (incremented every time we break bitstream compatibility. encoder_init_func SpeexMode::enc_init.SPEEX LICENSE
Speex License. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: Redistributions of source code must retain the above copyright notice, this list of conditions and the followingdisclaimer.
IETF RTP PROFILE
IETF RTP Profile AVT G. Herlein Internet-Draft Intended status: Standards Track J. Valin Expires: October 24, 2007 University of Sherbrooke A. Heggestad April 22, 2007 RTP Payload Format for the Speex Codec draft-ietf-avt-rtp-speex-01 (non-final) Status of this Memo By submitting this Internet-Draft, each author represents that any applicable patent or other IPR claims of which he or she is SPEEX: JITTERBUFFER: ADAPTIVE JITTER BUFFER Detailed Description This is the jitter buffer that reorders UDP/RTP packets and adjusts the buffer size to maintain good quality and lowlatency.
THE SPEEX CODEC MANUAL VERSION 1.2 BETA 2 The Speex Codec ManualVersion 1.2 Beta 2. The Speex Codec Manual. Version 1.2 Beta 2. Vorbis is open-source and patent-free; why do we need Speex? Isn't there an open-source implementation of the GSM-FR codec? Why is Speex necessary? Under what license is Speex released? Am I allowed to use Speex in commercial software?SPEEX: CLASS LIST
Speex Class List. Here are the classes, structs, unions and interfaces with brief descriptions: FORMATS AND STANDARDS Formats and standards. Speex can encode speech in both narrowband and wideband and provides different bit-rates. However, not all features need to be supported by a certain implementation or device. In order to be called ``Speex compatible'' (whatever that means), an implementation must implement at least a basic set of features.SPEEX: MAIN PAGE
Speex Documentation. 1.2-beta2 . Generated on Wed May 23 00:53:16 2007 for Speex by 1.5.1 1.5.1 SPEEX: SPEEX ENCODER AND DECODER Uses an existing encoder state to encode one frame of speech pointed to by "in". The encoded bit-stream is saved in "bits". Frees all resources associated to an existing Speex encoder state. Returns a handle to a newly created Speex encoder state structure. For now, the "mode" argument can be &nb_mode or &wb_mode .FAQ - SPEEX
FAQ. Vorbis is open-source and patent-free; why do we need Speex? Vorbis is a great project but its goals are not the same as Speex. Vorbis is mostly aimed at compressing music and audio in general, while Speex targets speech only. SPEEX: SPEEXMODE STRUCT REFERENCE Pointer to the mode query function. const char* SpeexMode::modeName. The name of the mode (you should not rely on this to identify the mode) int SpeexMode::modeID. ID of the mode. int SpeexMode::bitstream_version. Version number of the bitstream (incremented every time we break bitstream compatibility. encoder_init_func SpeexMode::enc_init.SPEEX LICENSE
Speex License. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: Redistributions of source code must retain the above copyright notice, this list of conditions and the followingdisclaimer.
IETF RTP PROFILE
IETF RTP Profile AVT G. Herlein Internet-Draft Intended status: Standards Track J. Valin Expires: October 24, 2007 University of Sherbrooke A. Heggestad April 22, 2007 RTP Payload Format for the Speex Codec draft-ietf-avt-rtp-speex-01 (non-final) Status of this Memo By submitting this Internet-Draft, each author represents that any applicable patent or other IPR claims of which he or she is SPEEX: JITTERBUFFER: ADAPTIVE JITTER BUFFER Detailed Description This is the jitter buffer that reorders UDP/RTP packets and adjusts the buffer size to maintain good quality and lowlatency.
SPEEX: SPEEXMODE STRUCT REFERENCE Pointer to the mode query function. const char* SpeexMode::modeName. The name of the mode (you should not rely on this to identify the mode) int SpeexMode::modeID. ID of the mode. int SpeexMode::bitstream_version. Version number of the bitstream (incremented every time we break bitstream compatibility. encoder_init_func SpeexMode::enc_init. SPEEX: CLASS MEMBERS Here is a list of all documented file members with links to the documentation: - d - decode_func : speex.h decoder_ctl_func : speex.h decoder_destroy_func : speex.h decoder_init_func :SPEEX LICENSE
Speex License. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: Redistributions of source code must retain the above copyright notice, this list of conditions and the followingdisclaimer.
SPEEX: CLASS MEMBERS Generated on Wed May 23 00:53:16 2007 for Speex by 1.5.1 1.5.1 SPEEX: SPEEX.H FILE REFERENCE Detailed Description Describes the different modes of the codec. Generated on Wed May 23 00:53:16 2007 for Speex by 1.5.1 1.5.1 SPEEX: DIRECTORY HIERARCHY Speex Directories. This directory hierarchy is sorted roughly, but not completely, alphabetically: include. speex. Generated on Wed May 23 00:53:16 2007 for Speex by 1.5.1. SPEEX: SPEEX.H SOURCE FILE Generated on Wed May 23 00:53:16 2007 for Speex by 1.5.1 1.5.1 GNU FREE DOCUMENTATION LICENSE It complements the GNU General Public License, which is a copyleft license designed for free software. We have designed this License in order to use it for manuals for free software, because free software needs free documentation: a free program should come with manuals providing the same freedoms that the software does. SPEEX: SPEEX_ECHO.H SOURCE FILE 00001 /* Copyright (C) Jean-Marc Valin */ 00006 /* 00007 Redistribution and use in source and binary forms, with or without 00008 modification, are permitted provided SPEEX: SPEEX_TYPES.H SOURCE FILE Generated on Wed May 23 00:53:16 2007 for Speex by 1.5.1 1.5.1 SPEEX: FREE AND OPEN SOURCE SOFTWARE Free and Open Source Software. Speex is available under the terms of the Xiph.Org variant of the BSD license, which is both an open source and free software license. Since there’s some confusion as to what this actually means to current and potential users of Speex, this page exists to clear up any misunderstandings. A program is free software per the Free Software Definition) if its users may: SPEEX: A FREE CODEC FOR FREE SPEECH Special Features. Speex. Speex supports intensity stereo encoding and 32 kHz sampling. iLBC. iLBC frames are encoded completely independently; while this provides better quality when 10% (or more) of the packets are being dropped, this makes the codec suboptimal for clean line conditions. SPEEX: A FREE CODEC FOR FREE SPEECH writing a plugin for your favorite audio player. helping make Speex a more widely recognized standard; work is already underway to make Speex an IETF -blessed standard, but work still remains in that arena. If you know of an organization that standardizes (on) audio compression codecs, consider proposing Speex asCOMPILING - SPEEX
In general, any architecture that can natively compute the multiplication of two signed 16-bit numbers (32-bit result) and runs at a sufficient clock rate (architecture-dependent) is capable of running Speex. Architectures that are known to be supported (itprobably works
SPEEX NARROWBAND MODE where , and are the jointly quantized pitch gains and is the codec excitation memory. It is worth noting that when the pitch is smaller than the sub-frame size, we repeat the excitation at a period .For example, when , we use instead. In most modes, the pitch period is encoded with 7 bits in the range and the coefficients are vector-quantized using 7 bits at higher bit-rates (15 kbpsCODEC DESCRIPTION
PROGRAMMING WITH SPEEX (THE LIBSPEEX API)SEE MORE ON SPEEX.ORG THE SPEEX CODEC MANUAL VERSION 1.2 BETA 3 The Speex Codec Manual Version 1.2 Beta 3 Jean-Marc Valin December 8,2007
FORMATS AND STANDARDS Formats and standards. Speex can encode speech in both narrowband and wideband and provides different bit-rates. However, not all features need to be supported by a certain implementation or device. In order to be called ``Speex compatible'' (whatever that means), an implementation must implement at least a basic set of features.SAMPLE CODE
Sample code. This section shows sample code for encoding and decoding speech using the Speex API. The commands can be used to encode and decode a file by calling: % sampleenc in_file.sw | sampledec out_file.sw. where both files are raw (no header) files encoded at 16 bits per sample (in the machine natural endianness). SPEEX: FREE AND OPEN SOURCE SOFTWARE Free and Open Source Software. Speex is available under the terms of the Xiph.Org variant of the BSD license, which is both an open source and free software license. Since there’s some confusion as to what this actually means to current and potential users of Speex, this page exists to clear up any misunderstandings. A program is free software per the Free Software Definition) if its users may: SPEEX: A FREE CODEC FOR FREE SPEECH Special Features. Speex. Speex supports intensity stereo encoding and 32 kHz sampling. iLBC. iLBC frames are encoded completely independently; while this provides better quality when 10% (or more) of the packets are being dropped, this makes the codec suboptimal for clean line conditions. SPEEX: A FREE CODEC FOR FREE SPEECH writing a plugin for your favorite audio player. helping make Speex a more widely recognized standard; work is already underway to make Speex an IETF -blessed standard, but work still remains in that arena. If you know of an organization that standardizes (on) audio compression codecs, consider proposing Speex asCOMPILING - SPEEX
In general, any architecture that can natively compute the multiplication of two signed 16-bit numbers (32-bit result) and runs at a sufficient clock rate (architecture-dependent) is capable of running Speex. Architectures that are known to be supported (itprobably works
SPEEX NARROWBAND MODE where , and are the jointly quantized pitch gains and is the codec excitation memory. It is worth noting that when the pitch is smaller than the sub-frame size, we repeat the excitation at a period .For example, when , we use instead. In most modes, the pitch period is encoded with 7 bits in the range and the coefficients are vector-quantized using 7 bits at higher bit-rates (15 kbpsCODEC DESCRIPTION
PROGRAMMING WITH SPEEX (THE LIBSPEEX API)SEE MORE ON SPEEX.ORG THE SPEEX CODEC MANUAL VERSION 1.2 BETA 3 The Speex Codec Manual Version 1.2 Beta 3 Jean-Marc Valin December 8,2007
FORMATS AND STANDARDS Formats and standards. Speex can encode speech in both narrowband and wideband and provides different bit-rates. However, not all features need to be supported by a certain implementation or device. In order to be called ``Speex compatible'' (whatever that means), an implementation must implement at least a basic set of features.SAMPLE CODE
Sample code. This section shows sample code for encoding and decoding speech using the Speex API. The commands can be used to encode and decode a file by calling: % sampleenc in_file.sw | sampledec out_file.sw. where both files are raw (no header) files encoded at 16 bits per sample (in the machine natural endianness). SPEEX: A FREE CODEC FOR FREE SPEECH: DOWNLOADS Speex 1.2rc2 and SpeexDSP 1.2rc2. This release splits the speex codec library and the speex DSP library into separate source trees. Both projects received build-system improvements, bugfixes, and cleanup. The speex codec's VBR tuning was improved, while the speexdsp resampler got some NEON optimizations. Downloads: THE SPEEX CODEC MANUAL VERSION 1.2 BETA 2 The Speex Codec ManualVersion 1.2 Beta 2. The Speex Codec Manual. Version 1.2 Beta 2. Vorbis is open-source and patent-free; why do we need Speex? Isn't there an open-source implementation of the GSM-FR codec? Why is Speex necessary? Under what license is Speex released? Am I allowed to use Speex in commercial software?CODEC DESCRIPTION
Codec description This section describes Speex and its features into more details. Concepts. Before introducing all the Speex features, here are some concepts in speech coding that help better understand the rest of the manual.SPEEX: FILE INDEX
Speex File List. Describes the different modes of the codec. Handles bit packing/unpacking. Describes callback handling and in-band signalling. Adaptive jitter buffer for Speex. Speex preprocessor. The preprocess can do noise suppression, residual echo suppression (after using the echo canceller), automatic gain control (AGC) and voiceactivity
FORMATS AND STANDARDS Formats and standards. Speex can encode speech in both narrowband and wideband and provides different bit-rates. However, not all features need to be supported by a certain implementation or device. In order to be called ``Speex compatible'' (whatever that means), an implementation must implement at least a basic set of features.SPEEX: MAIN PAGE
Speex Documentation. 1.2-beta2 . Generated on Wed May 23 00:53:16 2007 for Speex by 1.5.1 1.5.1SPEEX: CLASS LIST
Speex Class List. Here are the classes, structs, unions and interfaces with brief descriptions:FAQ - SPEEX
FAQ. Vorbis is open-source and patent-free; why do we need Speex? Vorbis is a great project but its goals are not the same as Speex. Vorbis is mostly aimed at compressing music and audio in general, while Speex targets speech only.SPEEX LICENSE
Speex License. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: Redistributions of source code must retain the above copyright notice, this list of conditions and the followingdisclaimer.
SPEEX: SPEEXJITTER: ADAPTIVE JITTER BUFFER SPECIFICALLY Detailed Description. This is the jitter buffer that reorders UDP/RTP packets and adjusts the buffer size to maintain good quality and low latency. This is a simplified version that works only with Speex, but is much easier to use. SPEEX: FREE AND OPEN SOURCE SOFTWARE Free and Open Source Software. Speex is available under the terms of the Xiph.Org variant of the BSD license, which is both an open source and free software license. Since there’s some confusion as to what this actually means to current and potential users of Speex, this page exists to clear up any misunderstandings. A program is free software per the Free Software Definition) if its users may: SPEEX: A FREE CODEC FOR FREE SPEECH Special Features. Speex. Speex supports intensity stereo encoding and 32 kHz sampling. iLBC. iLBC frames are encoded completely independently; while this provides better quality when 10% (or more) of the packets are being dropped, this makes the codec suboptimal for clean line conditions. SPEEX: A FREE CODEC FOR FREE SPEECH writing a plugin for your favorite audio player. helping make Speex a more widely recognized standard; work is already underway to make Speex an IETF -blessed standard, but work still remains in that arena. If you know of an organization that standardizes (on) audio compression codecs, consider proposing Speex asCOMPILING - SPEEX
In general, any architecture that can natively compute the multiplication of two signed 16-bit numbers (32-bit result) and runs at a sufficient clock rate (architecture-dependent) is capable of running Speex. Architectures that are known to be supported (itprobably works
SPEEX NARROWBAND MODE where , and are the jointly quantized pitch gains and is the codec excitation memory. It is worth noting that when the pitch is smaller than the sub-frame size, we repeat the excitation at a period .For example, when , we use instead. In most modes, the pitch period is encoded with 7 bits in the range and the coefficients are vector-quantized using 7 bits at higher bit-rates (15 kbpsCODEC DESCRIPTION
PROGRAMMING WITH SPEEX (THE LIBSPEEX API)SEE MORE ON SPEEX.ORG THE SPEEX CODEC MANUAL VERSION 1.2 BETA 3 The Speex Codec Manual Version 1.2 Beta 3 Jean-Marc Valin December 8,2007
FORMATS AND STANDARDS Formats and standards. Speex can encode speech in both narrowband and wideband and provides different bit-rates. However, not all features need to be supported by a certain implementation or device. In order to be called ``Speex compatible'' (whatever that means), an implementation must implement at least a basic set of features.SAMPLE CODE
Sample code. This section shows sample code for encoding and decoding speech using the Speex API. The commands can be used to encode and decode a file by calling: % sampleenc in_file.sw | sampledec out_file.sw. where both files are raw (no header) files encoded at 16 bits per sample (in the machine natural endianness). SPEEX: FREE AND OPEN SOURCE SOFTWARE Free and Open Source Software. Speex is available under the terms of the Xiph.Org variant of the BSD license, which is both an open source and free software license. Since there’s some confusion as to what this actually means to current and potential users of Speex, this page exists to clear up any misunderstandings. A program is free software per the Free Software Definition) if its users may: SPEEX: A FREE CODEC FOR FREE SPEECH Special Features. Speex. Speex supports intensity stereo encoding and 32 kHz sampling. iLBC. iLBC frames are encoded completely independently; while this provides better quality when 10% (or more) of the packets are being dropped, this makes the codec suboptimal for clean line conditions. SPEEX: A FREE CODEC FOR FREE SPEECH writing a plugin for your favorite audio player. helping make Speex a more widely recognized standard; work is already underway to make Speex an IETF -blessed standard, but work still remains in that arena. If you know of an organization that standardizes (on) audio compression codecs, consider proposing Speex asCOMPILING - SPEEX
In general, any architecture that can natively compute the multiplication of two signed 16-bit numbers (32-bit result) and runs at a sufficient clock rate (architecture-dependent) is capable of running Speex. Architectures that are known to be supported (itprobably works
SPEEX NARROWBAND MODE where , and are the jointly quantized pitch gains and is the codec excitation memory. It is worth noting that when the pitch is smaller than the sub-frame size, we repeat the excitation at a period .For example, when , we use instead. In most modes, the pitch period is encoded with 7 bits in the range and the coefficients are vector-quantized using 7 bits at higher bit-rates (15 kbpsCODEC DESCRIPTION
PROGRAMMING WITH SPEEX (THE LIBSPEEX API)SEE MORE ON SPEEX.ORG THE SPEEX CODEC MANUAL VERSION 1.2 BETA 3 The Speex Codec Manual Version 1.2 Beta 3 Jean-Marc Valin December 8,2007
FORMATS AND STANDARDS Formats and standards. Speex can encode speech in both narrowband and wideband and provides different bit-rates. However, not all features need to be supported by a certain implementation or device. In order to be called ``Speex compatible'' (whatever that means), an implementation must implement at least a basic set of features.SAMPLE CODE
Sample code. This section shows sample code for encoding and decoding speech using the Speex API. The commands can be used to encode and decode a file by calling: % sampleenc in_file.sw | sampledec out_file.sw. where both files are raw (no header) files encoded at 16 bits per sample (in the machine natural endianness). SPEEX: A FREE CODEC FOR FREE SPEECH: DOWNLOADS Speex 1.2rc2 and SpeexDSP 1.2rc2. This release splits the speex codec library and the speex DSP library into separate source trees. Both projects received build-system improvements, bugfixes, and cleanup. The speex codec's VBR tuning was improved, while the speexdsp resampler got some NEON optimizations. Downloads: THE SPEEX CODEC MANUAL VERSION 1.2 BETA 2 The Speex Codec ManualVersion 1.2 Beta 2. The Speex Codec Manual. Version 1.2 Beta 2. Vorbis is open-source and patent-free; why do we need Speex? Isn't there an open-source implementation of the GSM-FR codec? Why is Speex necessary? Under what license is Speex released? Am I allowed to use Speex in commercial software?CODEC DESCRIPTION
Codec description This section describes Speex and its features into more details. Concepts. Before introducing all the Speex features, here are some concepts in speech coding that help better understand the rest of the manual.SPEEX: FILE INDEX
Speex File List. Describes the different modes of the codec. Handles bit packing/unpacking. Describes callback handling and in-band signalling. Adaptive jitter buffer for Speex. Speex preprocessor. The preprocess can do noise suppression, residual echo suppression (after using the echo canceller), automatic gain control (AGC) and voiceactivity
FORMATS AND STANDARDS Formats and standards. Speex can encode speech in both narrowband and wideband and provides different bit-rates. However, not all features need to be supported by a certain implementation or device. In order to be called ``Speex compatible'' (whatever that means), an implementation must implement at least a basic set of features.SPEEX: MAIN PAGE
Speex Documentation. 1.2-beta2 . Generated on Wed May 23 00:53:16 2007 for Speex by 1.5.1 1.5.1SPEEX: CLASS LIST
Speex Class List. Here are the classes, structs, unions and interfaces with brief descriptions:FAQ - SPEEX
FAQ. Vorbis is open-source and patent-free; why do we need Speex? Vorbis is a great project but its goals are not the same as Speex. Vorbis is mostly aimed at compressing music and audio in general, while Speex targets speech only.SPEEX LICENSE
Speex License. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: Redistributions of source code must retain the above copyright notice, this list of conditions and the followingdisclaimer.
SPEEX: SPEEXJITTER: ADAPTIVE JITTER BUFFER SPECIFICALLY Detailed Description. This is the jitter buffer that reorders UDP/RTP packets and adjusts the buffer size to maintain good quality and low latency. This is a simplified version that works only with Speex, but is much easier to use.Xiph.org Opus
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Speex XSPF
—The Speex codec has been obsoleted by Opus . It will continue to be available, but since Opus is better than Speex in all aspects, users are encouraged toswitch—
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SPEEX: A FREE CODEC FOR FREE SPEECHOVERVIEW
Speex is an Open Source/Free Software patent-free audio compression format designed for speech. The Speex Project aims to lower the barrier of entry for voice applications by providing a free alternative to expensive proprietary speech codecs. Moreover, Speex is well-adapted to Internet applications and provides useful features that are not present in most other codecs. Finally, Speex is part of the GNU Project and is available under the revised BSD license .THE TECHNOLOGY
Speex is based on CELP and is designed to compress voice at bitrates ranging from 2 to 44 kbps. Some of Speex's features include: * Narrowband (8 kHz), wideband (16 kHz), and ultra-wideband (32 kHz) compression in the same bitstream * Intensity stereo encoding * Packet loss concealment * Variable bitrate operation (VBR) * Voice Activity Detection (VAD) * Discontinuous Transmission (DTX)* Fixed-point port
* Acoustic echo canceller* Noise suppression
Note that Speex has a number of features that are not present in other codecs, such as intensity stereo encoding, integration of multiple sampling rates in the same bitstream (embedded coding), and a VBR mode; see our comparison page for more.GETTING INVOLVED
One of the simplest things you can do to get involved in Speex is by using it in your application; Speex is well-suited to handle VoIP, internet audio streaming, data archival (like voice mail), and audio books. Currently, LinPhone , Ekiga, and Asterisk are
some of the projects currently using Speex. For a list of projects with Speex support, visit our Plugins & Software page. If you have questions or are interested in contributing to the project, have a look at our roadmap , join our mailing list, or send us money
so we can keep working on Speex. You can also contact the Project Lead, Jean-Marc Valin (though the mailing is usually the best place to ask questions). PATCHES CAN BE SENT TO THE mailing list, and should apply
on the latest master branch.HEADLINES
*
SPEEX 1.2.0 IS OUT
December 7, 2016
This is the latest stable release of the Speex codec library.*
SPEEXDSP 1.2RC3 IS OUTJanuary 3, 2015
This brown-paper-bag release adds two headers that should have been included with SpeexDSP 1.2rc2. These are needed to build the resampler with NEON optimizations and to build SpeexDSP without the Speex codeclibrary.
*
SPEEX 1.2RC2 AND SPEEXDSP 1.2RC2 ARE OUTDecember 6, 2014
This release splits the speex codec library and the speex DSP library into separate source trees. Both projects received build-system improvements, bugfixes, and cleanup. The speex codec's VBR tuning was improved, while the speexdsp resampler got some NEON optimizations.*
SPEEX 1.2RC1 IS OUT
July 23, 2008
This release adds support for acoustic echo cancellation with multiple microphones and multiple loudspeakers. It also adds an API to decorrelate loudspeaker signals to improve multi-channel performance. In the bugfix department, there are fixes for a few bugs in the echo canceller, jitter buffer and preprocessor. At this point, the API for 1.2 should be stable and only a few very minor additions are planned.*
SPEEX 1.2BETA3 IS OUTDecember 11, 2007
The most obvious change in this release is that all the non-codec components (preprocessor, echo cancellation, jitter buffer) have been moved to a new _libspeexdsp_ library. Other changes include a new jitter buffer algorithm and resampler improvements/fixes. This is also the first release where libspeex can be built without any floating point support. To do this, the float compatibility API must be disabled (--disable-float-api or DISABLE_FLOAT_API) and the VBR feature must be disabled (--disable-vbr or DISABLE_VBR). The Xiph OSC and the Speex Parrot logos are trademarks (™) ofXiph.Org.
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