update SDL_mixer to SDL3_mixer 3.2.0
This commit is contained in:
Sven Balzer
@@ -0,0 +1,413 @@
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# Migrating to SDL_mixer 3.0
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## Intro
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SDL_mixer 3.0 (aka "SDL3_mixer") is a dramatically different library than
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previous versions. The API has been completely redesigned. There is no
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compatibility layer. If you want to use it, you have to migrate to it.
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SDL3_mixer requires SDL3. It relies on many features that are new to SDL3,
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both internally and in the public API, so if your project is on SDL 1.2 or
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SDL2, you'll have to move your project to SDL3 at the same time.
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That being said, we think SDL3_mixer and SDL3 are both great pieces of
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software--significant improvements over their previous versions--and we
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think that once you move to them, you'll be quite happy you did.
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There are a lot of things that don't have simple replacements that can be
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changed mechanically to migrate to SDL3_mixer. The new API is in many ways
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more powerful, but also much simpler. For example, there's no equivalent of
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Mix_ModMusicJumpToOrder(), because messing with the specifics
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of MOD files in the public API is both uncommon and generally pretty messy.
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This migration guide will attempt to walk through the important details but
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it's possible that some things can't be done the same way. Feel free to open
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bug reports if you're totally stuck.
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The end of this document provides a "tl;dr" section that lists each SDL2_mixer
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function name and a brief explanation about what to do with it.
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## Things that are totally gone
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- Native MIDI has been removed. We have ripped this piece out of SDL2_mixer
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and packaged it as a separate library that can be used alongside SDL3_mixer,
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or without SDL_mixer at all: https://github.com/libsdl-org/SDL_native_midi
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- Mix_GetNumTracks(), Mix_StartTrack(), and Mix_ModMusicJumpToOrder() have
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been removed; these were decoder-specific APIs.
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- Mix_SetSoundFonts(), Mix_GetSoundFonts(), Mix_EachSoundFont(),
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Mix_SetTimidityCfg(), Mix_GetTimidityCfg(): these have been removed, but
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decoder-specific settings can be passed on in a generic way in SDL3_mixer,
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using SDL properties.
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- Mix_QuickLoad_WAV(): this was just too unsafe to offer.
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## Including SDL3_mixer
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The proper way to include SDL3_mixer's header is:
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```c
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#include <SDL3_mixer/SDL_mixer.h>
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```
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Like SDL3, the new convention is to use `<>` brackets and a subdirectory.
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## Symbol names
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In SDL2_mixer, all functions started with `Mix_` and macros started with
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`MIX_`. In SDL3_mixer, everything starts with `MIX_`.
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## Versioning
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Versions are now bits packed into a single int instead of a struct, using
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SDL3's usual magic for unpacking these.
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## Initialization
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Previously you had to tell SDL_mixer what file formats you expected to use
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during Mix_Init(). Now you don't:
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```c
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if (!MIX_Init()) {
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SDL_Log("MIX_Init failed: %s", SDL_GetError());
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} else {
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SDL_Log("SDL_mixer is ready!");
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}
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```
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MIX_Init() is reference-counted; it's safe to call it more than once, and
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only the first call will do actual initialization tasks. Likewise, actual
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deinitialization with MIX_Quit() will only happen when it has been called
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as many times as MIX_Init() has. This allows different parts of the program
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to initialize and use SDL3_mixer without knowing about other parts using it
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too.
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Previously the (singleton) mixer was opened with Mix_OpenAudio(), now one
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calls MIX_CreateMixerDevice(). You can open multiple mixers now, in case
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different parts of a program want to operate independently, or you need to
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use different audio devices at the same time (or, with Mix_CreateMixer(),
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write audio to a memory buffer instead of a device).
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MIX_CreateMixerDevice() accepts an SDL_AudioSpec as a hint, but makes no
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promises the audio device will be at any given format. The hint is just
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to indicate that most of the inputs will be in a certain format, and maybe
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this will reduce conversion work if the device can handle it. But SDL3_mixer
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is well-prepared to manage any input or output formats it ends up with.
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Mix_QuerySpec() has been replaced by MIX_GetMixerFormat().
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## Locking
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SDL2_mixer expected you to lock the SDL audio device directly if you needed
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explicit synchronization. SDL3 doesn't have a direct equivalent of SDL2's
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SDL_LockAudioDevice(), and SDL3_mixer might be operating without an audio
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device at all, so there are now explicit MIX_LockMixer() and MIX_UnlockMixer()
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API calls available.
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## Music vs chunks
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SDL2_mixer made a distinction between "chunks" (uncompressed audio sitting in
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memory, to be played on a "channel") and "music" (streaming, probably
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compressed, audio). It offered multiple chunks to be mixed together, along
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with a single music input.
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In SDL3_mixer, there is no distinction between types of audio; all inputs can
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be compressed or uncompressed, preloaded into memory or streamed, in any
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supported file format. As many as you like of any type can mix at once.
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Preloaded (but not necessarily predecoded) audio is managed in MIX_Audio
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objects. These are audio files precached in RAM. They can be decompressed
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upfront, or on the fly while mixing.
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In SDL2_mixer, data would be loaded with Mix_LoadWAV() for chunks, or
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Mix_LoadMUS() for music, or some variant thereof. In SDL3_mixer, you will call
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MIX_LoadAudio(), MIX_LoadAudio_IO(), or if you have some unconventional need,
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MIX_LoadAudioWithProperties().
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A special function in SDL2_mixer, Mix_QuickLoad_RAW(), has been replaced with
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MIX_LoadRawAudioNoCopy(). It's a little more generic (it does not require your
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data be in the same format as the hardware), but it will still let you get
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data all the way through the mixing pipeline without any extra allocations or
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copies.
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Many functions in SDL2_mixer had two versions: one for chunks and one for
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music, like Mix_FreeChunk() vs Mix_FreeMusic(). In SDL3_mixer, equivalent
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APIs have a single function that works with everything.
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Mix_GetNumChunkDecoders() and Mix_GetChunkDecoder() (and the Music
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equivalents) have been replaced with MIX_GetNumAudioDecoders() and
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MIX_GetAudioDecoder(). The returned strings might be different than in
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SDL2_mixer for the same decoding backends.
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## Channels
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SDL2_mixer had "channels," each of which contained a single chunk to be mixed
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during playback. Channels were referenced by index, and you would preallocate
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the number of channels you intended to use with Mix_AllocateChannels() (unless
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you needed 8 channels, the default, in which case you just used them).
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SDL3_mixer has "tracks," each containing a single input (a loaded audio file,
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an SDL_AudioStream for dynamically generated sound, or an SDL_IOStream to
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stream a file on-demand). They are allocated one at a time, and referenced by
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the pointer returned from MIX_CreateTrack(). To keep an indexable set of
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tracks to match SDL2_mixer's channels, just call MIX_CreateTrack() in a loop,
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storing the pointers in an array, and use indices into that array. There are
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no tracks created by default, so to match SDL2_mixer's default, create 8 of
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them at startup.
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## Metadata
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Functions that return metadata about an audio file, like Mix_GetMusicTitle(),
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have been removed. Instead, all audio files have a set of SDL properties.
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These properties offer both low-level tag information and a standard property
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for well-known metadata types. For example, if your MP3 has an ID3v2 tag, you
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might end up with a property named "SDL_mixer.metadata.id3v2.TIT2" and the
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same info in a standard "SDL_mixer.metadata.title" property (which there's a
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standard symbol for: `MIX_PROP_METADATA_TITLE_STRING`. This allows SDL3_mixer
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to expose non-standard information, but also offer easy lookup of the most
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common, and most important, metadata.
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After loading an audio file, MIX_GetAudioProperties() will provide the
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metadata (and also provide a convenient place for the app to hang their own
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app-specific data, as well).
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## Hooks
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SDL3_mixer offers several callbacks at different points in the mixing
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pipeline. They can be used to recreate SDL2_mixer's Mix_SetPostMix(),
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Mix_HookMusic(), Mix_HookMusicFinished(), Mix_ChannelFinished(), and
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Mix_RegisterEffect().
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Note that in SDL3_mixer, all callbacks provide audio data in float32 format,
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so you won't need to have different paths for different formats.
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## Effects
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SDL2_mixer had several "effects" that were internal code that used the
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Mix_RegisterEffect() interface to modify chunks before they were mixed.
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Mix_SetPanning() can be replaced with MIX_SetTrackStereo(), but this will
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force the track to play on the Front Left and Front Right speakers in a
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surround-sound setup. If you actually want the track to move left to
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right, respecting any surround-sound layout, use MIX_SetTrack3DPosition()
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and move the sound across the X axis.
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Mix_SetPosition() and Mix_SetDistance() can also use MIX_SetTrack3DPosition()
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to better effect, but you'll have to convert to 3D coordinates instead of
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angle/distance. Here's some (untested) math to do that:
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```c
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const float radians = angle * (SDL_PI_F / 180.0f); // convert degrees to radians.
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const float fdistance = ((float) distance);
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const float x = SDL_cosf(radians) * fdistance; // left to right
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const float y = 0.0f; // leave everything vertically centered on the listener.
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const float z = SDL_sinf(radians) * fdistance; // front to back
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```
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Mix_SetReverseStereo() can be replaced with MIX_SetTrackOutputChannelMap():
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```c
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const int chmap = { 1, 0 }; // left becomes right, right becomes left.
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MIX_SetTrackOutputChannelMap(track, chmap, 2);
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```
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## Channel groups
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In SDL2_mixer, you could "tag" channels with an int value, and then reference
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all channels that match that tag.
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In SDL3_mixer, you can still tag a track, but the tag is an arbitrary string,
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like "ui" or "ambient" or whatever. A track can have multiple tags.
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Tag tracks with MIX_TagTrack() and remove a tag with MIX_UntagTrack().
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## Playing
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There are several different functions in SDL2_mixer to start a channel playing
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(Mix_Play*, Mix_FadeIn*, etc). All of these have collapsed into MIX_PlayTrack().
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MIX_PlayTrack() takes an SDL_PropertiesID for options (if the defaults don't cover
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it). Before playing, a track must have an input assigned, either through
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MIX_SetTrackAudio() to play from preloaded audio, MIX_SetTrackIOStream() to play
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from a file loaded on-demand, or MIX_SetTrackAudioStream() to play procedural
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audio, either buffered upfront or generated on-demand.
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## Volume
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Mix_VolumeChunk() and Mix_VolumeMusic() are replaced by MIX_SetTrackGain(). They
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take a float instead of an int from 0 to 128, and can be used to not only quiet
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the existing data, but also make it louder.
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Mix_MasterVolume() is replaced by MIX_SetMixerGain(). Same idea.
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## Halting
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Mix_HaltChannel(), MIX_HaltMusic(), Mix_FadeOutChannel() and Mix_FadeOutMusic()
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are replaced by MIX_StopTrack(). Be careful here: fade-outs work in sample
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frames of the track's input, not milliseconds, in SDL3_mixer. Use
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MIX_TrackMSToFrames() to convert. However, If stopping multiple tracks at once
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with MIX_StopAllTracks() or MIX_StopTag(), the fade out is specified in
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_milliseconds_, since we can't guarantee that all tracks have the same sample
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rate.
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## Pausing
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Mix_Pause(), Mix_PauseMusic(), Mix_Resume() and Mix_ResumeMusic() became
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MIX_PauseTrack() and MIX_ResumeTrack().
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## Music state
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Mix_MusicDuration() became MIX_GetAudioDuration() and Mix_GetMusicPosition() became
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MIX_GetTrackPlaybackPosition(). MIX_SetMusicPosition() is now
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MIX_SetTrackPlaybackPosition().
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## Shutdown
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Mix_CloseAudio() is now MIX_DestroyMixer(). Destroying a mixer will destroy
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everything it owns (tracks, etc), but not MIX_Audio objects, since they can be
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shared between mixers. MIX_Quit() can be used to destroy _everything_ that
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SDL3_mixer created, including the mixers and MIX_Audio objects, which might be
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more convenient.
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## tl;dr
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A very brief comment on what to do with each symbol in SDL2_mixer.
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Some of these are listed as "no equivalent in SDL3_mixer" but could possibly
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be added if there is a need. If you're stuck, please file an issue and we
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can discuss it!
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- MIX_MAJOR_VERSION => SDL_MIXER_MAJOR_VERSION
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- MIX_MINOR_VERSION => SDL_MIXER_MAJOR_VERSION
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- MIX_PATCHLEVEL => SDL_MIXER_MICRO_VERSION
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- MIX_VERSION => SDL_MIXER_VERSION
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- MIX_Linked_Version => MIX_Version
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- Mix_Version => MIX_Version
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- SDL_MIXER_COMPILEDVERSION => SDL_MIXER_VERSION
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- MIX_InitFlags => not needed in SDL3_mixer.
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- Mix_Init => MIX_Init (no initflags needed)
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- Mix_Quit => MIX_Quit
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- MIX_CHANNELS => not needed in SDL3_mixer.
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- MIX_DEFAULT_FREQUENCY => 44100
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- MIX_DEFAULT_FORMAT => SDL_AUDIO_S16
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- MIX_DEFAULT_CHANNELS => 2
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- MIX_MAX_VOLUME => 1.0f
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- Mix_Chunk => MIX_Audio
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- Mix_Fading => not needed in SDL3_mixer.
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- Mix_MusicType => MIX_PROP_AUDIO_DECODER_STRING property with MIX_GetAudioProperties().
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- Mix_Music => MIX_Audio
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- Mix_OpenAudio => MIX_CreateMixerDevice
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- Mix_PauseAudio => MIX_PauseAllTracks
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- Mix_QuerySpec => MIX_GetMixerFormat
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- Mix_AllocateChannels => MIX_CreateTrack
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- Mix_LoadWAV_IO => MIX_LoadAudio_IO
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- Mix_LoadWAV => MIX_LoadAudio
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- Mix_LoadMUS_IO => MIX_LoadAudio_IO
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- Mix_LoadMUS => MIX_LoadAudio
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- Mix_LoadMUSType_IO => MIX_LoadAudioWithProperties with MIX_PROP_AUDIO_DECODER_STRING property set.
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- Mix_QuickLoad_WAV => MIX_LoadAudio_IO with an SDL_IOFromConstMem() and closeio=true.
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- Mix_QuickLoad_RAW => MIX_LoadRawAudioNoCopy
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- Mix_FreeChunk => MIX_DestroyAudio
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- Mix_FreeMusic => MIX_DestroyAudio
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- Mix_GetNumChunkDecoders => MIX_GetNumAudioDecoders
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- Mix_GetChunkDecoder => MIX_GetAudioDecoder
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- Mix_HasChunkDecoder => call MIX_GetAudioDecoder, up to MIX_GetNumAudioDecoders times
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- Mix_GetNumMusicDecoders => MIX_GetNumAudioDecoders
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- Mix_GetMusicDecoder => MIX_GetAudioDecoder
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- Mix_HasMusicDecoder => call MIX_GetAudioDecoder, up to MIX_GetNumAudioDecoders times
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- Mix_MusicType => MIX_PROP_AUDIO_DECODER_STRING property with MIX_GetAudioProperties().
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- Mix_GetMusicTitle => MIX_PROP_METADATA_TITLE_STRING property with Mix_GetAudioProperties()
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- Mix_GetMusicTitleTag => MIX_PROP_METADATA_TITLE_STRING property with Mix_GetAudioProperties()
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- Mix_GetMusicArtistTag => MIX_PROP_METADATA_ARTIST_STRING property with Mix_GetAudioProperties()
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- Mix_GetMusicAlbumTag => MIX_PROP_METADATA_ALBUM_STRING property with Mix_GetAudioProperties()
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- Mix_GetMusicCopyrightTag => MIX_PROP_METADATA_COPYRIGHT_STRING property with Mix_GetAudioProperties()
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- Mix_SetPostMix => MIX_SetPostMixCallback
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- Mix_HookMusic => MIX_SetTrackAudioStream and set a get-callback on that stream, start track playing.
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- Mix_HookMusicFinished => MIX_SetTrackStoppedCallback
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- Mix_GetMusicHookData => no equivalent in SDL3_mixer.
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- Mix_ChannelFinished => MIX_SetTrackStoppedCallback
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- MIX_CHANNEL_POST => MIX_SetPostMixCallback
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- Mix_RegisterEffect => MIX_SetTrackCookedCallback, plus optional MIX_SetTrackStoppedCallback
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- Mix_UnregisterEffect => MIX_SetTrackCookedCallback, plus optional MIX_SetTrackStoppedCallback
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- Mix_UnregisterAllEffects => MIX_SetTrackCookedCallback, plus optional MIX_SetTrackStoppedCallback
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- MIX_EFFECTSMAXSPEED => no equivalent in SDL3_mixer.
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- Mix_SetPanning => MIX_SetTrackStereo or MIX_SetTrack3DPosition
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- Mix_SetPosition => MIX_SetTrack3DPosition
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- Mix_SetDistance => MIX_SetTrack3DPosition
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- Mix_SetReverseStereo => MIX_SetTrackOutputChannelMap
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- Mix_ReserveChannels => no equivalent in SDL3_mixer.
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- Mix_GroupChannel => MIX_TagTrack
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- Mix_GroupChannels => MIX_TagTrack
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- Mix_GroupAvailable => no equivalent in SDL3_mixer.
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- Mix_GroupCount => no equivalent in SDL3_mixer.
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- Mix_GroupOldest => no equivalent in SDL3_mixer.
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- Mix_GroupNewer => no equivalent in SDL3_mixer.
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- Mix_PlayChannel => MIX_SetTrackAudio then MIX_PlayTrack
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- Mix_PlayChannelTimed => MIX_SetTrackAudio then MIX_PlayTrack
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- Mix_PlayMusic => MIX_SetTrackAudio then MIX_PlayTrack
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- Mix_FadeInMusic => MIX_SetTrackAudio then MIX_PlayTrack
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- Mix_FadeInMusicPos => MIX_SetTrackAudio then MIX_PlayTrack
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- Mix_FadeInChannel => MIX_SetTrackAudio then MIX_PlayTrack
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- Mix_FadeInChannelTimed => MIX_SetTrackAudio then MIX_PlayTrack
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- Mix_Volume => MIX_SetTrackGain
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- Mix_VolumeChunk => MIX_SetTrackGain; gain is not set on MIX_Audio, only on MIX_Track
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- Mix_VolumeMusic => MIX_SetTrackGain
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- Mix_GetMusicVolume => MIX_GetTrackGain
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- Mix_MasterVolume => MIX_SetMixerGain
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- Mix_HaltChannel => MIX_StopTrack
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- Mix_HaltGroup => MIX_StopTag
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- Mix_HaltMusic => MIX_StopTrack
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- Mix_ExpireChannel => no equivalent in SDL3_mixer.
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- Mix_FadeOutChannel => MIX_StopTrack
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- Mix_FadeOutGroup => MIX_StopTag
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- Mix_FadeOutMusic => MIX_StopTrack
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- Mix_FadingMusic => no equivalent in SDL3_mixer.
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- Mix_FadingChannel => no equivalent in SDL3_mixer.
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- Mix_Pause => MIX_PauseTrack
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- Mix_PauseGroup => MIX_PauseTag
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- Mix_Resume => MIX_ResumeTrack
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- Mix_PauseGroup => MIX_ResumeTag
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- Mix_Paused => MIX_TrackPaused
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- Mix_PauseMusic => MIX_PauseTrack
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- Mix_ResumeMusic => MIX_ResumeTrack
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- Mix_RewindMusic => MIX_SetTrackPlaybackPosition(track, 0)
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- Mix_PausedMusic => MIX_TrackPaused
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- Mix_ModMusicJumpToOrder => no equivalent in SDL3_mixer.
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- Mix_StartTrack => no equivalent in SDL3_mixer.
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- Mix_GetNumTracks => no equivalent in SDL3_mixer.
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- Mix_SetMusicPosition => MIX_SetTrackPlaybackPosition
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- Mix_GetMusicPosition => MIX_GetTrackPlaybackPosition
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- Mix_MusicDuration => MIX_GetAudioDuration
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||||
- Mix_GetMusicLoopStartTime => no equivalent in SDL3_mixer.
|
||||
- Mix_GetMusicLoopEndTime => no equivalent in SDL3_mixer.
|
||||
- Mix_GetMusicLoopLengthTime => no equivalent in SDL3_mixer.
|
||||
- Mix_Playing => MIX_TrackPlaying
|
||||
- Mix_PlayingMusic => MIX_TrackPlaying
|
||||
- Mix_SetSoundFonts => MIX_LoadAudioWithProperties with "SDL_mixer.decoder.fluidsynth.soundfont_iostream" or "SDL_mixer.decoder.fluidsynth.soundfont_path" property set
|
||||
- Mix_GetSoundFonts => no equivalent in SDL3_mixer.
|
||||
- Mix_EachSoundFont => no equivalent in SDL3_mixer.
|
||||
- Mix_SetTimidityCfg => FIXME currently SDL_setenv("TIMIDITY_CFG")
|
||||
- Mix_GetTimidityCfg => no equivalent in SDL3_mixer.
|
||||
- Mix_GetChunk => MIX_GetTrackAudio or MIX_GetTrackAudioStream
|
||||
- Mix_CloseAudio => MIX_DestroyMixer
|
||||
|
||||
Reference in New Issue
Block a user