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audio: Add channel remapping to SDL_AudioSpec and SDL_AudioStream.

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Fixes #8367.
This commit is contained in:
Ryan C. Gordon
2024-07-03 03:19:00 -04:00
parent 0367f1af19
commit 16e7fdc4f2
12 changed files with 254 additions and 193 deletions
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16
src/audio/SDL_sysaudio.h
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@@ -48,8 +48,6 @@
#define DEFAULT_AUDIO_RECORDING_CHANNELS 1
#define DEFAULT_AUDIO_RECORDING_FREQUENCY 44100
#define AUDIO_SPECS_EQUAL(x, y) (((x).format == (y).format) && ((x).channels == (y).channels) && ((x).freq == (y).freq))
typedef struct SDL_AudioDevice SDL_AudioDevice;
typedef struct SDL_LogicalAudioDevice SDL_LogicalAudioDevice;
@@ -113,9 +111,19 @@ extern void ConvertAudioToFloat(float *dst, const void *src, int num_samples, SD
extern void ConvertAudioFromFloat(void *dst, const float *src, int num_samples, SDL_AudioFormat dst_fmt);
extern void ConvertAudioSwapEndian(void* dst, const void* src, int num_samples, int bitsize);
extern SDL_bool SDL_ChannelMapIsDefault(const Uint8 *map, int channels);
extern SDL_bool SDL_ChannelMapIsBogus(const Uint8 *map, int channels);
// this gets used from the audio device threads. It has rules, don't use this if you don't know how to use it!
extern void ConvertAudio(int num_frames, const void *src, SDL_AudioFormat src_format, int src_channels,
void *dst, SDL_AudioFormat dst_format, int dst_channels, void* scratch);
extern void ConvertAudio(int num_frames,
const void *src, SDL_AudioFormat src_format, int src_channels, const Uint8 *src_map,
void *dst, SDL_AudioFormat dst_format, int dst_channels, const Uint8 *dst_map,
void* scratch);
// Compare two SDL_AudioSpecs, return SDL_TRUE if they match exactly.
// Using SDL_memcmp directly isn't safe, since potential padding (and unused parts of the channel map) might not be initialized.
extern SDL_bool SDL_AudioSpecsEqual(const SDL_AudioSpec *a, const SDL_AudioSpec *b);
// Special case to let something in SDL_audiocvt.c access something in SDL_audio.c. Don't use this.
extern void OnAudioStreamCreated(SDL_AudioStream *stream);