{"id":21928104,"url":"https://github.com/depp/vadpcm","last_synced_at":"2025-07-20T08:35:40.481Z","repository":{"id":194175173,"uuid":"690370063","full_name":"depp/vadpcm","owner":"depp","description":"VADPCM audio encoding and decoding","archived":false,"fork":false,"pushed_at":"2023-09-23T06:14:43.000Z","size":204,"stargazers_count":2,"open_issues_count":12,"forks_count":0,"subscribers_count":2,"default_branch":"main","last_synced_at":"2025-03-22T12:18:45.298Z","etag":null,"topics":[],"latest_commit_sha":null,"homepage":null,"language":"C","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"mpl-2.0","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/depp.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":"LICENSE.txt","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null}},"created_at":"2023-09-12T04:16:22.000Z","updated_at":"2024-12-26T16:25:48.000Z","dependencies_parsed_at":null,"dependency_job_id":"9fe1514e-973b-427f-9808-451118532bc0","html_url":"https://github.com/depp/vadpcm","commit_stats":null,"previous_names":["depp/vadpcm"],"tags_count":0,"template":false,"template_full_name":null,"purl":"pkg:github/depp/vadpcm","repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/depp%2Fvadpcm","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/depp%2Fvadpcm/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/depp%2Fvadpcm/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/depp%2Fvadpcm/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/depp","download_url":"https://codeload.github.com/depp/vadpcm/tar.gz/refs/heads/main","sbom_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/depp%2Fvadpcm/sbom","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":266092839,"owners_count":23875545,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":[],"created_at":"2024-11-28T22:20:41.748Z","updated_at":"2025-07-20T08:35:40.445Z","avatar_url":"https://github.com/depp.png","language":"C","funding_links":[],"categories":[],"sub_categories":[],"readme":"# VADPCM\n\nThis is an implementation of the VADPCM codec. The VADPCM codec is often used by Nintendo 64 games—this includes both homebrew games made using [LibDragon][libdragon] and commercial games made during the 1990s and 2000s with the proprietary SDK, [LibUltra][libultra].\n\n[libdragon]: https://github.com/DragonMinded/libdragon\n[libultra]: https://n64brew.dev/wiki/Libultra\n\nVADPCM is licensed under the terms of the Mozilla Public License Version 2.0. See LICENSE.txt for details.\n\n## Project Status\n\nThe project is, as of September 2023, under active development. Version 1.0 is expected within the next six months.\n\n## What is VADPCM?\n\nVADPCM is a variant of ADPCM. It encodes blocks of 16 samples of audio into 9 bytes of data, giving 4.5 bits per sample. There are no settings or parameters to change the bit rate; the bit rate is always 4.5 bits per sample.\n\nThe audio quality of VADPCM is good, but this codec is not competitive with codecs like Opus, Vorbis, or even MP3.\n\n### Technical Details\n\nVADPCM uses a codebook of second-order linear predictors, and encodes the residuals using 4 bits per sample. Each block of 16 samples shares the same predictor and scaling factor. The predictors in the codebook are stored in a vector format, which makes it easy to write a high-performance decoder using SIMD instructions. The Nintendo 64 has a coprocessor, called the Reality Signal Processor, with SIMD capabilities.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fdepp%2Fvadpcm","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fdepp%2Fvadpcm","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fdepp%2Fvadpcm/lists"}