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=========================================== QUALCOMM PureVoice Windows/Linux SDK v3.1 =========================================== This QUALCOMM PureVoice SDK provides High level API's and Mid level API's that manipulate Microsoft Waveform (.wav) and PureVoice QCP (.qcp) files for Microsoft Windows and Linux. It is distributed in two files, according to the operating system: purevoice_sdk-3.1.zip [Windows] purevoice_sdk-3.1.tar.gz [Linux] This library represents a major redesign of the previous SDK version. A new library, the Qualcomm Speech Codec Library (QSCL), obsoletes the old Qualcomm PureVoice Library (QPL). The new library is a complete rewrite with an improved internal structure. All definitions which could conflict with Microsoft's COM (e.g. DEFINE_GUID, IUnknown, etc.) have been replaced with similar definitions (e.g. DEFINE_QSCL_GUID, IQsclUnknown, etc.) High Level * Converts a wave file (8-kHz, 16-bit PCM) into PureVoice (.qcp) file and vice versa as well as memory based conversion. Mid Level * Opens .qcp file in either READ or WRITE mode * Closes .qcp file * Reads blocks of PureVoice data and decodes to linear 8-kHz, 16-bit PCM samples. * Writes blocks of PCM data into PureVoice format after encoding. * Retrieves a length of file in blocks. * Retrieves format information about a file (block size, sampling rate, etc.) ========== Contents ========== * readme.txt (this file) Files for Qualcomm Speech Codec Library (QSCL): * qscl.h - Contains the necessary defines and interface classes * qscl.dll - PureVoice library (Windows only, obsoletes old "qpl.dll") * qscl.lib - Import LIB for qscl.dll (Windows only) * libqscl.a - PureVoice library static link archive (Linux only) * libqscl.so.1.1.4 - PureVoice library shared object (Linux only) A sample program which uses QSCL, to convert WAV to QCP in files: * example/example.cpp - Sample source code * example/example.vcproj - Project file for Microsoft Visual Studio .NET 2003 (Windows only) * example/makefile.linux - Makefile for building example in Linux (Linux only) * example/test.wav - Sample .WAV input file Second sample program which uses QSCL, to convert WAV to QCP in memory: * example2/example2.cpp - Sample source code * example2/example2.vcproj - Project file for Microsoft Visual Studio .NET 2003 (Windows only) * example2/makefile.linux - Makefile for building example in Linux (Linux only) * example2/test.wav - Sample .WAV input file Command line wav<->qcp file conversion tool which can convert wave files into QCP files in different rate setttings, including a fixed fullrate: * pvconv.exe [Windows] * pvconv [Linux] ========================================================= Objects and their interfaces (see qscl.h for more detail) ========================================================= QsclFile | --> IQsclConvertFile [converts .qcp <-> .wav files] | | | |-convertFile convert qcp to wav and vice-versa | |-getProgress get progress of conversion | --> IQsclFile [reads or writes .qcp files] | | | |-open open file | |-close close file | |-read read and decode | |-write encode and write | |-seek if reading, change current position in file | |-tell return current position in file | |-getFileSize get file length in number of blocks | |-getInfo return file information structure | --> IQsclFileOptions | |-getCnfgChunk extract optional "cnfg" chunk from QCP file |-setCnfgChunk add/replace optional "cnfg" chunk from QCP file |-getTextChunk extract optional "text" chunk from QCP file |-setTextChunk add/replace optional "text" chunk from QCP file |-getLablChunk extract optional "labl" chunk from QCP file |-setLablChunk add/replace optional "labl" chunk from QCP file ------------------------------------------------------------------------------ QsclCodecQcelp - IS-733 Qualcomm PureVoice speech codec QsclCodecQcelpSmartRate - PureVoice in reduced rate mode (SmartRate) QsclCodecPcm - PCM class (used to specify raw audio) QsclCodecUlaw - G.711 (mu-law) audio | --> IQsclCodec | | | |-configure specify rate set (full rate, variable rate, etc.) | | and set codec-specific mode | | parameter (not used for QCELP) | |-getInfo get info on CODEC | |-getRateSetInfo return number of bytes needed to store a | | packet with a given rate byte | |-getName return display name of CODEC | |-getVersion return current version of CODEC | |-getAvgBitrate return average bitrate of CODEC | |-convert encode or decode | --> IQsclError | |-wasLastError returns indicator of whether or not | CODEC encountered an error |-getLastError returns display message for last error encountered ------------------------------------------------------------------------------ ============================== CHANGES SINCE 3.0 ============================== * IQsclCodec::getRateSetInfo now returns 0xFFFFFFFF rather than 0 for rate bytes which are not valid for the codec, so that they can be distinguished from rates which are valid but have zero payload. * Fixed bug in handling of seeking with QSCL_HANDLE_CLIENT, which prevented it from working when converting files using IQsclConvertFile. * Fixed bug in IQsclFile::open which caused problems when trying to open a QCP file without decoding it. * Fixed bug in writing RIFF chunks, where area searched for a chunk could extend past the end of the file, causing access violations. * Eased restriction on reading RIFF files with malformed RIFF size field. The files will open now without throwing an exception, but if the RIFF size field is ignored if it doesn't match the actual file size. * Added second example, which shows how to perform memory-based file conversions using QSCL_HANDLE_CLIENT. * Name of dynamic link library in Linux is now "libqscl.so.1" instead of "libqscl.so", so that dlopen can find the library without the admin needing to specifically create a symbolic link - ldconfig will create the "libqscl.so.1" link automatically. * Updated license and legal information. ============================== CHANGES SINCE 2.1 ============================== * Renamed all symbols which could conflict with Microsoft COM * Reorganized internals to follow stricter coding guidelines * No need to reset CODEC to switch between encoding/decoding * CODEC now can be queried for display name, version, and average bitrate * Added G.711 (mu-law) audio support (QsclCodecUlaw) * Added padded, header-less, and native rate sets * Command line argument -e for pvconv changed to -r, and parameter meaning changed from number (e.g. 1, 2, etc.) to identifier (e.g. vfr, ffr, etc.) ============================== FAQ ============================== Q: There is one extra byte at the end of the file. A: This is by design. The QCP file format follows RIFF file format format, which requires that all chunks in the file are word (16 bit) aligned. So if the real size happens to be odd size, then we'll add a pad byte. Q: What happened to IQPLPvHrCodec, IQPLPvVrHrCodec, IQPLPvFrCodec, etc.? A: Each codec and rate set combination is no longer represented by its own interface.