Device to connect classic audio systems to the network https://cgit.xengineering.eu/soundbox/atom?h=alsa-loop 2024-01-24T19:29:09Z 2024-01-24T19:29:09Z xengineering me@xengineering.eu 2024-01-24T17:22:26Z urn:sha1:26444dbc9195c8eec0e6caa360d67d5c14d129c9 2024-01-21T08:19:43Z xengineering me@xengineering.eu 2024-01-21T08:19:43Z urn:sha1:38d6997e5f6bd725b28c8cc6ed28cda670a2e900 The default streaming guide is now far away from the original taken from the FFmpeg streaming guide. Since the command can handle a lot of inputs its also not useful to send sine waves to soundbox devices. 2024-01-20T20:55:22Z xengineering me@xengineering.eu 2024-01-20T20:55:22Z urn:sha1:090e063a539f6ee6e62e65ada619787930c31eac 2024-01-20T20:25:20Z xengineering me@xengineering.eu 2024-01-20T14:20:02Z urn:sha1:ce3aad39474789faa7e3c8fd49a6f401c8fa3c01 This makes sure the audio-receiving software `ffplay` runs all the time. 2024-01-20T14:12:42Z xengineering me@xengineering.eu 2024-01-20T14:12:42Z urn:sha1:e7f055deddf551c32de631c4579c53589ea14948 2024-01-20T11:05:15Z xengineering me@xengineering.eu 2024-01-19T15:33:22Z urn:sha1:75a661f088ff48b87c67af4ed14d8dc162e3bb93 This makes a soundbox device discoverable via the Link Layer Discovery Protocol (LLDP). That way a client application can lookup the available soundbox devices inside the network to display playback options. 2024-01-14T19:50:59Z xengineering me@xengineering.eu 2024-01-14T19:50:59Z urn:sha1:36341f1e9856e17ad00e3741bb5bc1224aadc225 While transcoding to a lossy formate like MP3 is not recommended [1] forquality reasons it has the advantage that alway UPD / Matroska / MP3 is used for soundbox. That way the stream can be stopped and started at any time without re-launching ffplay on the soundbox device. This could make the SSH connection to the soundbox not longer needed. [1]: https://trac.ffmpeg.org/wiki/Encode/HighQualityAudio#WhenshouldItranscodeaudio 2024-01-14T19:48:43Z xengineering me@xengineering.eu 2024-01-14T19:48:43Z urn:sha1:6a05f26e4a7726fa719a55b5918b0262b27c02ba 2024-01-14T19:27:05Z xengineering me@xengineering.eu 2024-01-14T19:27:05Z urn:sha1:8a47aec3581f0272677ffbbbc9d488c50fbd973d The Matroska format has to advantage that a stream can be stopped and the restarted at any time without executing new commands on the soundbox device. Since Matroska and RTP have similar / redundant features [1] the transport protocol is switched to plain UDP. [1]: https://en.wikipedia.org/wiki/Comparison_of_video_container_formats#cite_note-22 2024-01-14T14:46:35Z xengineering me@xengineering.eu 2024-01-14T14:46:35Z urn:sha1:e94b3cc341a4a641ca41cc95f3b8ae907654e34a 2024-01-14T13:14:45Z xengineering me@xengineering.eu 2024-01-14T13:14:45Z urn:sha1:a7dc6b07781cb7901e9bbcffbe0d5ffa1c690c73 This allows to stream to multiple devices at the same time. Nevertheless it still works for a point to point stream. 2024-01-14T13:10:35Z xengineering me@xengineering.eu 2024-01-14T13:10:35Z urn:sha1:afe7b5fb9921dd990719e5823a7fd30553d3ed23 The soundbox software should be portable to other Raspberry Pis without the HiFiBerry DAC too. 2024-01-14T11:22:51Z xengineering me@xengineering.eu 2024-01-14T11:22:51Z urn:sha1:41c73098b35dd820d22b557363fcd1aaed6133ae 2024-01-14T11:04:06Z xengineering me@xengineering.eu 2024-01-14T11:04:06Z urn:sha1:0b0ca08ee8a4954c59ea2421f7e7dfcf1272baff The music streaming documentation used to enforce re-encoding via ffmpeg to save bandwidth. This led to pretty poor audio quality. This is not the purpose of soundbox. It is assumed that the user wants the highest possible audio quality as default. 2024-01-14T10:44:18Z xengineering me@xengineering.eu 2024-01-06T09:50:09Z urn:sha1:27c2557c21cae2af48b9ba298149c6fe9cceb96f Configuring the Alpine Linux operating system correctly for soundbox is not trivial. Since it is very important it has to be documented in detail. 2024-01-14T10:44:12Z xengineering me@xengineering.eu 2024-01-13T16:04:53Z urn:sha1:5f62cff66916db54f3be0c9fbc6198253ef7b6f0 The tar-based installation is more difficult to explain but has the advantage that the partition size is maximized from the beginning. This is way easier than resizing the partition after the installation. 2024-01-12T21:02:02Z xengineering me@xengineering.eu 2024-01-05T21:14:44Z urn:sha1:bfbdcfad3489f943748fa584972d27c9255d365b This is currently the recommended OS installation for soundbox. 2024-01-06T19:50:43Z xengineering me@xengineering.eu 2024-01-06T19:49:03Z urn:sha1:e1acff9b0583e19dec4c27061c4bb4d16fe79d1b There used to be no extra space between paragraphs which in combination with no indentation was not useful. 2024-01-05T21:03:23Z xengineering me@xengineering.eu 2024-01-05T21:03:23Z urn:sha1:3b7c474bebcdc79ec354859366673b441c8f90e1 This flag makes sure the file is streamed in native frame rate and not e.g. way faster. This is the expected behaviour. 2024-01-05T19:58:34Z xengineering me@xengineering.eu 2024-01-05T19:58:34Z urn:sha1:cad96e8944a86df30376564dca15661ddef590a4 This port should be used in the future as soundbox standard port. 2024-01-05T11:03:13Z xengineering me@xengineering.eu 2024-01-05T11:03:13Z urn:sha1:90286663aa293deeb91bed3ae2319bc77a461467 This allows more testing than only streaming sine waves. 2024-01-05T10:48:23Z xengineering me@xengineering.eu 2024-01-05T10:48:23Z urn:sha1:f2b47e8030fdfcd8c794d1e27ab1b35c7e87310c This documents a basic FFmpeg streaming example so that soundbox devices can be tested. 2024-01-05T09:52:04Z xengineering me@xengineering.eu 2024-01-04T21:05:39Z urn:sha1:ce83411b44ffce77e57fb1b834c6008f4222a3fe This section is important to communicate how to interpret version numbers in the context of this device repository. 2024-01-05T09:07:04Z xengineering me@xengineering.eu 2024-01-04T20:44:56Z urn:sha1:15285f111eae401663a459344e99e4e351ea3207 This is required to build the table of contents and similar parts of the document correctly. 2024-01-05T09:07:04Z xengineering me@xengineering.eu 2024-01-04T20:35:23Z urn:sha1:c2d8261aba307223d3f1edce3a88a4d212395e4a Inside the artifacts folder aswell as inside the source folder adding a 'soundbox-' prefix to files is uncommon. In both cases only the root level folder should contain the name 'soundbox' to remove redundancies. 2024-01-03T13:21:59Z xengineering me@xengineering.eu 2024-01-03T13:21:59Z urn:sha1:207473d754a42f8969ce23ee20da0aeec54b4768 2024-01-03T11:49:26Z xengineering me@xengineering.eu 2024-01-03T11:49:26Z urn:sha1:b9ecbb7c782fed6256ce2a0da80bde17a4c24fa9 This document will be quite long. Thus the report document class is more suitable. 2024-01-03T11:48:01Z xengineering me@xengineering.eu 2024-01-03T09:45:21Z urn:sha1:380cd37e628b8da6e21d11e1a69ca5d4c899c48a This draft should give an overview of the planned sections which is useful to decide what should belong into the first sections and what should be written in later ones. 2024-01-03T11:03:43Z xengineering me@xengineering.eu 2024-01-02T21:52:42Z urn:sha1:a13b2b67711ba722301319d322f5d6233cbc77b2 The build system should convert the documentation source files automatically to a single PDF file to make documentation generation trivial. 2024-01-03T11:03:43Z xengineering me@xengineering.eu 2024-01-02T21:37:32Z urn:sha1:5273564397c2f4ba82e6d60d35a34e1c5666eb0f This LaTeX document should contain the full device documentation for soundbox. It will not cover aspects about the source or how to build. This should be covered inside the README of this repository. Everything else will be part of the resulting documentation PDF file.