FFmpeg

Commit Graph

Author	SHA1	Message	Date
Jack Bruienne	39a33038ce	avcodec: add DFPWM1a codec From the wiki page (https://wiki.vexatos.com/dfpwm): > DFPWM (Dynamic Filter Pulse Width Modulation) is an audio codec > created by Ben “GreaseMonkey” Russell in 2012, originally to be used > as a voice codec for asiekierka's pixmess, a C remake of 64pixels. > It is a 1-bit-per-sample codec which uses a dynamic-strength one-pole > low-pass filter as a predictor. Due to the fact that a raw DPFWM decoding > creates a high-pitched whine, it is often followed by some post-processing > filters to make the stream more listenable. It has recently gained popularity through the ComputerCraft mod for Minecraft, which added support for audio through this codec, as well as the Computronics expansion which preceeded the official support. These both implement the slightly adjusted 1a version of the codec, which is the version I have chosen for this patch. This patch adds a new codec (with encoding and decoding) for DFPWM1a. The codec sources are pretty simple: they use the reference codec with a basic wrapper to connect it to the FFmpeg AVCodec system. To clarify, the codec does not have a specific sample rate - it is provided by the container (or user), which is typically 48000, but has also been known to be 32768. The codec does not specify channel info either, and it's pretty much always used with one mono channel. However, since it appears that libavcodec expects both sample rate and channel count to be handled by either the codec or container, I have made the decision to allow multiple channels interleaved, which as far as I know has never been used, but it works fine here nevertheless. The accompanying raw format has a channels option to set this. (I expect most users of this will not use multiple channels, but it remains an option just in case.) This patch will be highly useful to ComputerCraft developers who are working with audio, as it is the standard format for audio, and there are few user-friendly encoders out there, and even fewer decoders. It will streamline the process for importing and listening to audio, replacing the need to write code or use tools that require very specific input formats. You may use the CraftOS-PC program (https://www.craftos-pc.cc) to test out DFPWM playback. To use it, run the program and type this command: "attach left speaker" Then run "speaker play <file.dfpwm>" for each file. The app runs in a sandbox, so files have to be transferred in first; the easiest way to do this is to simply drag the file on the window. (Or copy files to the folder at https://www.craftos-pc.cc/docs/saves.) Sample DFPWM files can be generated with an online tool at https://music.madefor.cc. This is the current best way to encode DFPWM files. Simply drag an audio file onto the page, and it will encode it, giving a download link on the page. I've made sure to update all of the docs as per Developer§7, and I've tested it as per section 8. Test files encoded to DFPWM play correctly in ComputerCraft, and other files that work in CC are correctly decoded. I have also verified that corrupt files do not crash the decoder - this should theoretically not be an issue as the result size is constant with respect to the input size. Signed-off-by: Jack Bruienne <jackbruienne@gmail.com>	3 years ago
Peter Ross	60a9d3778f	avcodec: GEM Raster image decoder Reviewed-by: Paul B Mahol <onemda@gmail.com> Signed-off-by: Peter Ross <pross@xvid.org>	3 years ago
Peter Ross	c655a734b1	avcodec/siren: MSN Siren decoder Reviewed-by: Paul B Mahol <onemda@gmail.com> Signed-off-by: Peter Ross <pross@xvid.org>	3 years ago
Anton Khirnov	881db34f6a	lavc: move av_get_pcm_codec() from avcodec.h to codec_id.h	3 years ago
Anton Khirnov	2628dff366	lavc: move avcodec_profile_name() from avcodec.h to codec_id.h	3 years ago
Anton Khirnov	000f35125f	lavc: move av_get_[exact_]bits_per_sample() to codec_id.h	3 years ago
Cameron Cawley	5c7313c740	avcodec: Implement Acorn Replay IMA ADPCM decoder Signed-off-by: Zane van Iperen <zane@zanevaniperen.com>	4 years ago
James Almer	d055af5e7b	avcodec/codec_id: remove unnecessary offsets from AVCodecID They are no longer required. Reviewed-by: Paul B Mahol <onemda@gmail.com> Signed-off-by: James Almer <jamrial@gmail.com>	4 years ago
Paul B Mahol	6b43e1a86c	avcodec: add SGA Video decoder	4 years ago
Paul B Mahol	5111707df6	avcodec: add SGA PCM decoder	4 years ago
Paul B Mahol	8651bf8a2e	avcodec: add Simbiosis IMX video decoder	4 years ago
Nuo Mi	ebdd33086a	avcodec: add vvc codec id and profiles Signed-off-by: James Almer <jamrial@gmail.com>	4 years ago
Peter Ross	85b442e231	avcodec/msp2dec: Microsoft Paint (MSP) version 2 decoder Signed-off-by: Peter Ross <pross@xvid.org>	4 years ago
Paul B Mahol	283f950a65	avcodec: add Cintel RAW decoder	4 years ago
hwren	8e74d98a29	lavc: add AVS3 codec id and desc Signed-off-by: hbj <hanbj@pku.edu.cn> Signed-off-by: hwren <hwrenx@126.com>	4 years ago
Paul B Mahol	a3a6b56200	avcodec: add Argonaut Games Video decoder	4 years ago
Paul B Mahol	5c2d7acb4f	avcodec: add IPU Video decoder and parser	4 years ago
Paul B Mahol	c8e38950e3	avcodec: add PhotoCD decoder	4 years ago
Paul B Mahol	7f95339319	avcodec: add MobiClip video decoder	4 years ago
Paul B Mahol	1304078d3c	avcodec: add FastAudio decoder	4 years ago
Paul B Mahol	a1caa16d45	avcodec: add ADPCM IMA MOFLEX decoder	4 years ago
Gautam Ramakrishnan	cfe2cf0a63	libavcodec/pgxdec: Add PGX decoder This patch adds a pgx decoder. Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>	4 years ago
Paul B Mahol	d49db99ce2	avcodec: add PFM image decoder	5 years ago
Anton Khirnov	b5aee6086b	avcodec.h: move avcodec_get_{type,name} to codec_id.h	5 years ago
Paul B Mahol	cdd06db56f	avcodec: add NotchLC decoder	5 years ago
Zane van Iperen	3e22e738c0	avcodec: add support for Cunning Developments' ADPCM Signed-off-by: Zane van Iperen <zane@zanevaniperen.com> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>	5 years ago
Anton Khirnov	c6978418b8	avcodec.h: split codec IDs into their own header	5 years ago

27 Commits (0d629c390ea7a51ffe35b08cff692046ec3efd4d)