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CC-Tweaked/doc/events/speaker_audio_empty.md

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Add arbitrary audio support to speakers (#982) Speakers can now play arbitrary PCM audio, sampled at 48kHz and with a resolution of 8 bits. Programs can build up buffers of audio locally, play it using `speaker.playAudio`, where it is encoded to DFPWM, sent across the network, decoded, and played on the client. `speaker.playAudio` may return false when a chunk of audio has been submitted but not yet sent to the client. In this case, the program should wait for a speaker_audio_empty event and try again, repeating until it works. While the API is a little odd, this gives us fantastic flexibility (we can play arbitrary streams of audio) while still being resilient in the presence of server lag (either TPS or on the computer thread). Some other notes: - There is a significant buffer on both the client and server, which means that sound take several seconds to finish after playing has started. One can force it to be stopped playing with the new `speaker.stop` call. - This also adds a `cc.audio.dfpwm` module, which allows encoding and decoding DFPWM1a audio files. - I spent so long writing the documentation for this. Who knows if it'll be helpful!
2021-12-13 22:56:59 +00:00
---
module: [kind=event] speaker_audio_empty
see: speaker.playAudio To play audio using the speaker
---
License CC:T according to the REUSE specification (#1351) This adds SPDX license headers to all source code files, following the REUSE[1] specification. This does not include any asset files (such as generated JSON files, or textures). While REUSE does support doing so with ".license" files, for now we define these licences using the .reuse/dep5 file. [1]: https://reuse.software/
2023-03-15 21:52:13 +00:00
<!--
SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
SPDX-License-Identifier: MPL-2.0
-->
Add arbitrary audio support to speakers (#982) Speakers can now play arbitrary PCM audio, sampled at 48kHz and with a resolution of 8 bits. Programs can build up buffers of audio locally, play it using `speaker.playAudio`, where it is encoded to DFPWM, sent across the network, decoded, and played on the client. `speaker.playAudio` may return false when a chunk of audio has been submitted but not yet sent to the client. In this case, the program should wait for a speaker_audio_empty event and try again, repeating until it works. While the API is a little odd, this gives us fantastic flexibility (we can play arbitrary streams of audio) while still being resilient in the presence of server lag (either TPS or on the computer thread). Some other notes: - There is a significant buffer on both the client and server, which means that sound take several seconds to finish after playing has started. One can force it to be stopped playing with the new `speaker.stop` call. - This also adds a `cc.audio.dfpwm` module, which allows encoding and decoding DFPWM1a audio files. - I spent so long writing the documentation for this. Who knows if it'll be helpful!
2021-12-13 22:56:59 +00:00
## Return Values
Use standard Markdown link syntax for references References are now written using normal links: You now use [`print`] or [print a string][`print`]) instead of @{print} or @{print|print a string}.
2023-08-24 09:48:30 +00:00
1. [`string`]: The event name.
2. [`string`]: The name of the speaker which is available to play more audio.
Add arbitrary audio support to speakers (#982) Speakers can now play arbitrary PCM audio, sampled at 48kHz and with a resolution of 8 bits. Programs can build up buffers of audio locally, play it using `speaker.playAudio`, where it is encoded to DFPWM, sent across the network, decoded, and played on the client. `speaker.playAudio` may return false when a chunk of audio has been submitted but not yet sent to the client. In this case, the program should wait for a speaker_audio_empty event and try again, repeating until it works. While the API is a little odd, this gives us fantastic flexibility (we can play arbitrary streams of audio) while still being resilient in the presence of server lag (either TPS or on the computer thread). Some other notes: - There is a significant buffer on both the client and server, which means that sound take several seconds to finish after playing has started. One can force it to be stopped playing with the new `speaker.stop` call. - This also adds a `cc.audio.dfpwm` module, which allows encoding and decoding DFPWM1a audio files. - I spent so long writing the documentation for this. Who knows if it'll be helpful!
2021-12-13 22:56:59 +00:00
## Example
Use standard Markdown link syntax for references References are now written using normal links: You now use [`print`] or [print a string][`print`]) instead of @{print} or @{print|print a string}.
2023-08-24 09:48:30 +00:00
This uses [`io.lines`] to read audio data in blocks of 16KiB from "example_song.dfpwm", and then attempts to play it
using [`speaker.playAudio`]. If the speaker's buffer is full, it waits for an event and tries again.
Add arbitrary audio support to speakers (#982) Speakers can now play arbitrary PCM audio, sampled at 48kHz and with a resolution of 8 bits. Programs can build up buffers of audio locally, play it using `speaker.playAudio`, where it is encoded to DFPWM, sent across the network, decoded, and played on the client. `speaker.playAudio` may return false when a chunk of audio has been submitted but not yet sent to the client. In this case, the program should wait for a speaker_audio_empty event and try again, repeating until it works. While the API is a little odd, this gives us fantastic flexibility (we can play arbitrary streams of audio) while still being resilient in the presence of server lag (either TPS or on the computer thread). Some other notes: - There is a significant buffer on both the client and server, which means that sound take several seconds to finish after playing has started. One can force it to be stopped playing with the new `speaker.stop` call. - This also adds a `cc.audio.dfpwm` module, which allows encoding and decoding DFPWM1a audio files. - I spent so long writing the documentation for this. Who knows if it'll be helpful!
2021-12-13 22:56:59 +00:00
Add speaker support to the documentation website Happy to pick a different piece of audio, but this seemed like a fun one to me.
2021-12-21 22:20:45 +00:00
```lua {data-peripheral=speaker}
Add arbitrary audio support to speakers (#982) Speakers can now play arbitrary PCM audio, sampled at 48kHz and with a resolution of 8 bits. Programs can build up buffers of audio locally, play it using `speaker.playAudio`, where it is encoded to DFPWM, sent across the network, decoded, and played on the client. `speaker.playAudio` may return false when a chunk of audio has been submitted but not yet sent to the client. In this case, the program should wait for a speaker_audio_empty event and try again, repeating until it works. While the API is a little odd, this gives us fantastic flexibility (we can play arbitrary streams of audio) while still being resilient in the presence of server lag (either TPS or on the computer thread). Some other notes: - There is a significant buffer on both the client and server, which means that sound take several seconds to finish after playing has started. One can force it to be stopped playing with the new `speaker.stop` call. - This also adds a `cc.audio.dfpwm` module, which allows encoding and decoding DFPWM1a audio files. - I spent so long writing the documentation for this. Who knows if it'll be helpful!
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local dfpwm = require("cc.audio.dfpwm")
local speaker = peripheral.find("speaker")
local decoder = dfpwm.make_decoder()
for chunk in io.lines("data/example.dfpwm", 16 * 1024) do
local buffer = decoder(chunk)
while not speaker.playAudio(buffer) do
os.pullEvent("speaker_audio_empty")
end
end
```
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