mirror of https://gitlab.com/ecodis/exhale.git
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196 lines
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<!-- www.ecodis.de/exhale/release.htm - created by Christian R. Helmrich - Copyright (c) 2018-2024 Christian R. Helmrich, project ecodis. All rights reserved. -->
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<meta name="author" content="Dr.-Ing. Christian R. Helmrich">
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<meta name="description" content="exhale Software Release Notes">
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<title>ecodis :: exhale :: Release Notes</title>
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<h1><br><span class="pink">exhale</span> - <span class="pink">e</span>codis e<span class="pink">x</span>tended <span class="pink">h</span>igh-efficiency <span class="pink">a</span>nd <span class="pink">l</span>ow-complexity <span class="pink">e</span>ncoder<br><span class="gray"><sup><br>Software Release Notes, Version History, Known Issues, Upcoming Feature Roadmap</sup></span><br><br></h1>
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<h3> The version of this distribution of the «exhale» software release is <b>1.2.1</b> (official pub­lic major release) from December 2023. Please check <a href="http://www.ecodis.de/audio.htm#mpeg">www.ecodis.de</a> regularly for new versions of this software. A summary of each version up to this release, a list of known issues with this release, and a roadmap of additional functionality are provided below.</h3>
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<h3><br><b>Chronological Version History</b></h3>
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<h3> Version <b>1.2.1 <span class="gray"> Dec. 2023, this release</span></b></h3>
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<ul>
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<li><h3>exhaleApp: always determine MPEG-4 instantaneous bit-rate across 2048 samples</h3></li>
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<li><h3>exhaleLib: added code for MSE optimized encoding (for tests, disabled by default)</h3></li>
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<li><h3>exhaleLib: code cleanup in quantization.*, increase max. IPF AU size to 10 kbit/ch</h3></li>
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<li><h3>exhaleLib: fix two rare high-rate quality issues (only affects CVBR modes above 5)</h3></li>
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</ul>
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<h3> Version <b>1.2.0 <span class="gray"> Dec. 2022</span></b></h3>
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<ul>
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<li><h3>C API correction, some code sanitizing (issue 24, merge requests 8–11, J. Regan)</h3></li>
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<li><h3>exhaleLib: code cleanup, very minor quality improvements in CVBR modes f and 5</h3></li>
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<li><h3>exhaleLib: 5% speedup of all modes, better target rate matching in CVBR mode g</h3></li>
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<li><h3>exhaleLib: work around MinGW compilation hickup (issue 26; thanks, C. Degawa!)</h3></li>
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</ul>
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<h3> Version <b>1.1.9 <span class="gray"> Dec. 2021</span></b></h3>
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<ul>
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<li><h3>exhaleApp: write encoder name and version as «udta» tool string into MP4 header</h3></li>
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<li><h3>exhaleApp: optimize leading and trailing PCM read for gapless playback (issue 21)</h3></li>
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</ul>
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<h3> Version <b>1.1.8 <span class="gray"> Oct. 2021</span></b></h3>
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<ul>
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<li><h3>some final code cleanup, small code corrections and editorial changes for this year</h3></li>
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<li><h3>exhaleLib: minor stereo quality tuning for low rates, optional CBR mode via macro</h3></li>
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</ul>
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<h3> Version <b>1.1.7 <span class="gray"> Aug. 2021</span></b></h3>
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<ul>
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<li><h3>minor tuning at low SBR rates, enabled SBR coding at 22050 Hz input sample rate</h3></li>
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<li><h3>exhaleApp: added expert modes for loudness leveling, custom Intra frame interval</h3></li>
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</ul>
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<h3> Version <b>1.1.6 <span class="gray"> May 2021</span></b></h3>
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<ul>
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<li><h3>minor quality tuning and support for delayless operation (media time=0) with SBR</h3></li>
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<li><h3>exhaleApp: fixed very rare output file corruption after finishing encoding with SBR</h3></li>
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<li><h3>exhaleApp: fixed compilation error under Fedora (issue 20) and stdin hickup issue</h3></li>
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<li><h3>exhaleLib: fixed some quality issues in SBR modes, no changes in non-SBR modes</h3></li>
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</ul>
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<h3> Version <b>1.1.5 <span class="gray"> Apr. 2021</span></b></h3>
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<ul>
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<li><h3>exhaleApp: correct print-out of Unicode file names and paths, minor code cleanup</h3></li>
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<li><h3>exhaleLib: minor tuning of immediate playout frames, no changes to audio quality</h3></li>
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<li><h3>makefile: support for compilation of Universal 2 binaries on MacOS™ (C. Snowhill)</h3></li>
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</ul>
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<h3> Version <b>1.1.4 <span class="gray"> Mar. 2021</span></b></h3>
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<ul>
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<li><h3>exhaleApp: removed LUFS/dBFS command arguments again, code now automatic</h3></li>
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<li><h3>exhaleApp: consider the working instead of application path if no path is specified</h3></li>
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<li><h3>exhaleLib: reduce enc. delay to closest integer multiple of frame length (issue 15)</h3></li>
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<li><h3>exhaleLib: very minor tuning of transient coding especially on male speech signals</h3></li>
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</ul>
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<h3> Version <b>1.1.3 <span class="gray"> Feb. 2021</span></b></h3>
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<ul>
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<li><h3>exhaleApp: allow specifying loudness (LUFS) and peak sample (dBFS) after preset</h3></li>
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<li><h3>exhaleLib: write UsacConfig in immediate playout frames (increases compatibility)</h3></li>
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</ul>
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<h3> Version <b>1.1.2 <span class="gray"> Jan. 2021</span></b></h3>
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<ul>
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<li><h3>further improved file interoperability and seekability with some playback software</h3></li>
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<li><h3>exhaleLib: write all frames in «stss» data as immediate playout frames (issue 15)</h3></li>
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</ul>
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<h3> Version <b>1.1.1 <span class="gray"> Dec. 2020</span></b></h3>
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<ul>
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<li><h3>slightly improved audio quality with SBR, better compatibility with some decoders</h3></li>
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<li><h3>exhaleLib: increased frequency resolution of coded SBR envelopes, minor cleanup</h3></li>
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<li><h3>exhaleLib: workaround for time differential coding bug in some xHE-AAC decoders</h3></li>
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</ul>
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<h3> Version <b>1.1.0 <span class="gray"> Nov. 2020</span></b></h3>
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<ul>
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<li><h3>addition of basic SBR functionality for lower-rate coding down to 18 kbps/channel</h3></li>
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<li><h3>exhaleApp: add support for CVBR modes a—g for encoding with SBR functionality</h3></li>
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<li><h3>exhaleApp: show «ARM» in header and '-v' command on corresponding platforms</h3></li>
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<li><h3>exhaleLib: basic 2:1 SBR encoding with ccfl = 2048, minor fixes and code cleanup</h3></li>
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</ul>
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<h3> Version <b>1.0.8 <span class="gray"> Oct. 2020</span></b></h3>
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<ul>
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<li><h3>minor quality improvements at low and high rates, some license text clarifications</h3></li>
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<li><h3>exhaleApp: slightly improved loudness calculation for low and high sampling rates</h3></li>
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<li><h3>exhaleLib: improved audio quality a bit for the lower and higher-rate CVBR modes</h3></li>
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<li><h3>License: removed references to BSD text, clarified disclaimer and contributor text</h3></li>
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</ul>
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<h3> Version <b>1.0.7 <span class="gray"> Aug. 2020</span></b></h3>
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<ul>
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<li><h3>minor bugfixes in bit-rate control and higher-rate coding at 32 kHz sampling rate</h3></li>
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<li><h3>exhaleApp: add support for CVBR mode 0 at codec sampling rates below 44.1 kHz</h3></li>
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<li><h3>exhaleApp: write complete MP4 «stss» data for improved compatibility (issue 13)</h3></li>
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<li><h3>exhaleApp: higher accuracy of loudness estimation, better BS.1770-4 compliance</h3></li>
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</ul>
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<h3> Version <b>1.0.6 <span class="gray"> July 2020</span></b></h3>
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<ul>
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<li><h3>bugfixes, improved quality on some transient signals, better decoder compatibility</h3></li>
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<li><h3>exhaleApp: support for Extensible WAVE format, write MP4 «prol» data (issue 10)</h3></li>
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<li><h3>exhaleApp: automatic downsampling of 48-kHz input to 32 kHz for CVBR mode 1</h3></li>
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<li><h3>exhaleLib: fine-tuning of psychoacoustic model for difficult transient input signals</h3></li>
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</ul>
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<h3> Version <b>1.0.5 <span class="gray"> June 2020</span></b></h3>
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<ul>
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<li><h3>slightly reduced bit-rates with lower modes, better compatibility when using stdin</h3></li>
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<li><h3>exhaleApp: support for Unicode text on Windows™, 44100 Hz with CVBR mode 1</h3></li>
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<li><h3>exhaleApp: automatic upsampling of low-sample-rate input, fixed reader (issue 9)</h3></li>
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<li><h3>exhaleLib: optimized noise filling tool for slightly lower bit-rates at CVBR mode <4</h3></li>
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<li><h3>compilation: exhaleApp.exe -> exhale.exe (issue 8), support for Arm™, C header</h3></li>
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</ul>
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<h3> Version <b>1.0.4 <span class="gray"> May 2020</span></b></h3>
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<ul>
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<li><h3>finalized basic joint-stereo and TNS coding functionality, quality and stability fixes</h3></li>
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<li><h3>exhaleApp: support for 32000 Hz with CVBR mode 1, added '-v' version command</h3></li>
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<li><h3>exhaleLib: completed audio quality fine-tuning for very tonal and transient signals</h3></li>
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<li><h3>compilation: support for MinGW (issue 5) and cmake (via CMakeList files, issue 6)</h3></li>
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</ul>
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<h3> Version <b>1.0.3 <span class="gray"> Apr. 2020</span></b></h3>
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<ul>
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<li><h3>extended basic joint-stereo coding functionality for mid/high rates, minor bugfixes</h3></li>
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<li><h3>exhaleLib: band adaptive joint-stereo coding for all CVBR modes, fixed rare crash</h3></li>
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<li><h3>exhaleLib: audio quality fine-tuning, especially for very tonal and transient signals</h3></li>
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<li><h3>makefile: -std=c++11 to allow for compilation with older versions of gcc (issue 4)</h3></li>
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</ul>
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<h3> Version <b>1.0.2 <span class="gray"> Mar. 2020</span></b></h3>
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<ul>
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<li><h3>added basic low/mid-rate joint-stereo coding functionality, bugfixes, and speedups</h3></li>
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<li><h3>exhaleApp: support for input sampling rates of up to 48000 Hz with CVBR mode 2</h3></li>
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<li><h3>exhaleLib: frame adaptive joint-stereo preprocessing and coding (CVBR mode <5)</h3></li>
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<li><h3>exhaleLib: accelerated R/D opt. coding, stability and quality fixes (issues 2 and 3)</h3></li>
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</ul>
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<h3> Version <b>1.0.1 <span class="gray"> Feb. 2020</span></b></h3>
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<ul>
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<li><h3>improved low-bitrate coding efficiency and support for MPEG-D loudness metadata</h3></li>
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<li><h3>exhaleApp: increased MP4 file versatility (issue 1) and calculation of loudness info</h3></li>
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<li><h3>exhaleLib: backward compatible API extension to support writing of loudness info</h3></li>
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<li><h3>exhaleLib: extended R/D optimized coding, improved short-transform quantization</h3></li>
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</ul>
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<h3> Version <b>1.0.0 <span class="gray"> Jan. 2020</span></b></h3>
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<ul>
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<li><h3>compilation fixes and executable printout changes for Linux and MacOS™ platform</h3></li>
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<li><h3>exhaleApp: fixed reading of WAVE files including metadata after the «data» chunk</h3></li>
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<li><h3>exhaleLib: some tuning of transform and noise level detection for transient signals</h3></li>
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<li><h3>exhaleLib: support for export as DLL on Microsoft Windows™ (not tested, though)</h3></li>
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</ul>
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<h3> Version <b>1.0RC <span class="gray">Dec. 2019</span></b></h3>
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<ul>
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<li><h3>initial release for testing with only basic channel-independent coding functionality</h3></li>
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<li><h3>only support for Microsoft Windows™ (32-bit and 64-bit) platform provided so far.</h3></li>
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</ul>
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<h3><br><b>Known Issues with This Release</b></h3>
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<h3> If you notice an issue with this release <b>not</b> mentioned below, please contact ecodis or a contributor with the details (configuration, input file) needed to reproduce the issue.</h3>
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<ul>
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<li><h3>exhaleApp: At the end of each encoding run, the MPEG-4 file header with seeking information is written to the beginning of the output file to maximize compatibility in audio streaming applications. Since such a file operation is not supported with pipe based output, encoding to stdout instead of files is currently not supported.</h3></li>
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<li><h3>exhaleApp: Only basic WAVE input file reading functionality has been implemen­ted. Specifically, 8-bit WAVE input is assumed to contain an even number of audio samples, and ITU-R <a href="https://www.itu.int/rec/R-REC-BS.2088/en">BS.2088</a> (RF64, Broadcast WAVE) files are not supported.</h3></li>
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</ul>
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<h3><br><b>Roadmap of Upcoming Features</b></h3>
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<h3> If you are in need of an additional library or application feature <b>not</b> mentioned below, please contact ecodis or a contributor with a request, and we will see what we can do.</h3>
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<ul>
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<li><h3>exhaleLib: finalization of support for 5.1–7.1 multichannel coding, no version plan</h3></li>
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<li><h3>exhaleLib: speed-ups and further quality tuning for difficult signals, as necessary.</h3></li>
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<h3><br></h3>
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<h4><span class="gray">Written by C. R. Helmrich for exhale 1.2.1, Dec. 2023. Available at www.ecodis.de/exhale/release.htm.</span><br><br></h4>
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<p><br> <img src="../src/app/exhaleApp.ico" alt="exhale" title="exhale" height="48" width="48"></p>
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<p></p>
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