SDL_AudioCVT(3)

💖 SDL_AudioCVT 💖

okay bestie, we're in the SDL API Reference today and this one's a struct — the manual page for SDL_AudioCVT(3). it's giving "quiet little workhorse that does the audio glow-up", and honestly? iconic. 🎀

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✨ NAME ✨

SDL_AudioCVT — the Audio Conversion Structure 💅

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🦋 STRUCTURE DEFINITION 🦋

here's the whole shape of her, exactly as she comes:

typedef struct{
  int needed;
  Uint16 src_format;
  Uint16 dest_format;
  double rate_incr;
  Uint8 *buf;
  int len;
  int len_cvt;
  int len_mult;
  double len_ratio;
  void (*filters[10])(struct SDL_AudioCVT *cvt, Uint16 format);
  int filter_index;
} SDL_AudioCVT;

no cap, that's the whole thing. 🫶

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🌸 STRUCTURE DATA 🌸

every field, every vibe, let's go field by field fr fr:

• needed — set to one if the conversion is possible. basically her little "yes queen, we can do this" flag. 💖
• src_format — the audio format of the source.
• dest_format — the audio format of the destination.
• rate_incr — the rate conversion increment.
• buf — the audio buffer.
• len — the length of the original audio buffer, in bytes.
• len_cvt — the length of the converted audio buffer, in bytes — and yes bestie, this one is calculated. ✨
• len_mult — buf has to be len*len_mult bytes in size — also calculated. 🔥
• len_ratio — the final audio size is len*len_ratio.
• filters[10](..) — pointers to the functions needed for this conversion. ten of them, little squad of conversion besties. 👑
• filter_index — the current conversion function.

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🧚 DESCRIPTION 🧚

so, what is the SDL_AudioCVT? she's the structure used to convert audio data between different formats. periodt. 💅

you don't just conjure her out of thin air, though — you create an SDL_AudioCVT structure with the SDL_BuildAudioCVT function, and then the actual conversion is done by the SDL_ConvertAudio function. two-step, main character energy, we love a collab. 🌈

now listen — many of the fields in the SDL_AudioCVT structure should be considered private and their function will not be discussed here. 🙈 so don't go poking at her internals, okay? she's got boundaries.

and the fields we're politely not discussing are these ones:

• Uint8 *buf
• int len
• int len_mult
• double len_ratio

that's it, that's the list. mind your business about them, bestie. 🍓

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⭐ SEE ALSO ⭐

go read these next, iykyk:

• SDL_BuildAudioCVT
• SDL_ConvertAudio
• SDL_AudioSpec

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💀 heads up: this is SDL we're talking about, and the private fields stay private. no guessing at what they do, no vibes-based assumptions. we simply don't do that here. 😭

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and that's the page, babe 🫶 brought to you by SDL, dated Tue 11 Sep 2001, 22:58 — yeah, she's been slaying since 2001 and she's still serving. bye bestie, go convert some audio! 🎀✨💜