#include "../SDL_internal.h"

Include dependency graph for SDL_audio_c.h:

This graph shows which files directly or indirectly include this file:

Macros
#define	DEBUG_CONVERT 0
#define	LOG_DEBUG_CONVERT(from, to)

Macro Definition Documentation

#define DEBUG_CONVERT 0

Definition at line 28 of file SDL_audio_c.h.

#define LOG_DEBUG_CONVERT	(	from,
		to
	)

Function Documentation

void SDL_CalculateAudioSpec ( SDL_AudioSpec * spec )

Definition at line 1660 of file SDL_audio.c.

References AUDIO_U8, SDL_AudioSpec::channels, SDL_AudioSpec::format, SDL_AudioSpec::samples, SDL_AUDIO_BITSIZE, SDL_AudioSpec::silence, and SDL_AudioSpec::size.

Referenced by open_audio_device(), and prepare_audiospec().

{
    switch (spec->format) {
    case AUDIO_U8:
        spec->silence = 0x80;
        break;
    default:
        spec->silence = 0x00;
        break;
    }
    spec->size = SDL_AUDIO_BITSIZE(spec->format) / 8;
    spec->size *= spec->channels;
    spec->size *= spec->samples;
}

void SDL_ChooseAudioConverters ( void )

Definition at line 1387 of file SDL_audiotypecvt.c.

References SDL_assert, SDL_FALSE, SDL_HasNEON, SDL_HasSSE2, SDL_TRUE, and SET_CONVERTER_FUNCS.

Referenced by SDL_BuildAudioCVT().

{
    static SDL_bool converters_chosen = SDL_FALSE;
    if (converters_chosen) {
        return;
    }
#define SET_CONVERTER_FUNCS(fntype) \
        SDL_Convert_S8_to_F32 = SDL_Convert_S8_to_F32_##fntype; \
        SDL_Convert_U8_to_F32 = SDL_Convert_U8_to_F32_##fntype; \
        SDL_Convert_S16_to_F32 = SDL_Convert_S16_to_F32_##fntype; \
        SDL_Convert_U16_to_F32 = SDL_Convert_U16_to_F32_##fntype; \
        SDL_Convert_S32_to_F32 = SDL_Convert_S32_to_F32_##fntype; \
        SDL_Convert_F32_to_S8 = SDL_Convert_F32_to_S8_##fntype; \
        SDL_Convert_F32_to_U8 = SDL_Convert_F32_to_U8_##fntype; \
        SDL_Convert_F32_to_S16 = SDL_Convert_F32_to_S16_##fntype; \
        SDL_Convert_F32_to_U16 = SDL_Convert_F32_to_U16_##fntype; \
        SDL_Convert_F32_to_S32 = SDL_Convert_F32_to_S32_##fntype; \
        converters_chosen = SDL_TRUE
#if HAVE_SSE2_INTRINSICS
    if (SDL_HasSSE2()) {
        SET_CONVERTER_FUNCS(SSE2);
        return;
    }
#endif
#if HAVE_NEON_INTRINSICS
    if (SDL_HasNEON()) {
        SET_CONVERTER_FUNCS(NEON);
        return;
    }
#endif
#if NEED_SCALAR_CONVERTER_FALLBACKS
    SET_CONVERTER_FUNCS(Scalar);
#endif
#undef SET_CONVERTER_FUNCS
    SDL_assert(converters_chosen == SDL_TRUE);
}

SDL_AudioFormat SDL_FirstAudioFormat ( SDL_AudioFormat format )

Definition at line 1639 of file SDL_audio.c.

References format_idx, NUM_FORMATS, and SDL_NextAudioFormat().

{
    for (format_idx = 0; format_idx < NUM_FORMATS; ++format_idx) {
        if (format_list[format_idx][0] == format) {
            break;
        }
    }
    format_idx_sub = 0;
    return SDL_NextAudioFormat();
}

void SDL_FreeResampleFilter ( void )

Definition at line 464 of file SDL_audiocvt.c.

References NULL, ResamplerFilter, ResamplerFilterDifference, and SDL_free.

Referenced by SDL_AudioQuit().

{
    SDL_free(ResamplerFilter);
    SDL_free(ResamplerFilterDifference);
    ResamplerFilter = NULL;
    ResamplerFilterDifference = NULL;
}

SDL_AudioFormat SDL_NextAudioFormat ( void )

Definition at line 1651 of file SDL_audio.c.

References format_idx, and NUM_FORMATS.

Referenced by SDL_FirstAudioFormat().

{
    if ((format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS)) {
        return 0;
    }
    return format_list[format_idx][format_idx_sub++];
}

int SDL_PrepareResampleFilter ( void )

Definition at line 435 of file SDL_audiocvt.c.

References kaiser_and_sinc(), NULL, ResampleFilterSpinlock, RESAMPLER_FILTER_SIZE, ResamplerFilter, ResamplerFilterDifference, SDL_AtomicLock, SDL_AtomicUnlock, SDL_free, SDL_malloc, and SDL_OutOfMemory.

Referenced by SDL_BuildAudioResampleCVT(), and SDL_NewAudioStream().

{
    SDL_AtomicLock(&ResampleFilterSpinlock);
    if (!ResamplerFilter) {
        /* if dB > 50, beta=(0.1102 * (dB - 8.7)), according to Matlab. */
        const double dB = 80.0;
        const double beta = 0.1102 * (dB - 8.7);
        const size_t alloclen = RESAMPLER_FILTER_SIZE * sizeof (float);
        ResamplerFilter = (float *) SDL_malloc(alloclen);
        if (!ResamplerFilter) {
            SDL_AtomicUnlock(&ResampleFilterSpinlock);
            return SDL_OutOfMemory();
        }
        ResamplerFilterDifference = (float *) SDL_malloc(alloclen);
        if (!ResamplerFilterDifference) {
            SDL_free(ResamplerFilter);
            ResamplerFilter = NULL;
            SDL_AtomicUnlock(&ResampleFilterSpinlock);
            return SDL_OutOfMemory();
        }
        kaiser_and_sinc(ResamplerFilter, ResamplerFilterDifference, RESAMPLER_FILTER_SIZE, beta);
    }
    SDL_AtomicUnlock(&ResampleFilterSpinlock);
    return 0;
}

Variable Documentation

SDL_AudioFilter SDL_Convert_F32_to_S16

Definition at line 60 of file SDL_audiotypecvt.c.

Referenced by SDL_BuildAudioTypeCVTFromFloat().

SDL_AudioFilter SDL_Convert_F32_to_S32

Definition at line 62 of file SDL_audiotypecvt.c.

Referenced by SDL_BuildAudioTypeCVTFromFloat().

SDL_AudioFilter SDL_Convert_F32_to_S8

Definition at line 58 of file SDL_audiotypecvt.c.

Referenced by SDL_BuildAudioTypeCVTFromFloat().

SDL_AudioFilter SDL_Convert_F32_to_U16

Definition at line 61 of file SDL_audiotypecvt.c.

Referenced by SDL_BuildAudioTypeCVTFromFloat().

SDL_AudioFilter SDL_Convert_F32_to_U8

Definition at line 59 of file SDL_audiotypecvt.c.

Referenced by SDL_BuildAudioTypeCVTFromFloat().

SDL_AudioFilter SDL_Convert_S16_to_F32

Definition at line 55 of file SDL_audiotypecvt.c.

Referenced by SDL_BuildAudioTypeCVTToFloat().

SDL_AudioFilter SDL_Convert_S32_to_F32

Definition at line 57 of file SDL_audiotypecvt.c.

Referenced by SDL_BuildAudioTypeCVTToFloat().

SDL_AudioFilter SDL_Convert_S8_to_F32

Definition at line 53 of file SDL_audiotypecvt.c.

Referenced by SDL_BuildAudioTypeCVTToFloat().

SDL_AudioFilter SDL_Convert_U16_to_F32

Definition at line 56 of file SDL_audiotypecvt.c.

Referenced by SDL_BuildAudioTypeCVTToFloat().

SDL_AudioFilter SDL_Convert_U8_to_F32

Definition at line 54 of file SDL_audiotypecvt.c.

Referenced by SDL_BuildAudioTypeCVTToFloat().

Functions
SDL_AudioFormat	SDL_FirstAudioFormat (SDL_AudioFormat format)
SDL_AudioFormat	SDL_NextAudioFormat (void)
void	SDL_CalculateAudioSpec (SDL_AudioSpec *spec)
void	SDL_ChooseAudioConverters (void)
int	SDL_PrepareResampleFilter (void)
void	SDL_FreeResampleFilter (void)

Variables
SDL_AudioFilter	SDL_Convert_S8_to_F32
SDL_AudioFilter	SDL_Convert_U8_to_F32
SDL_AudioFilter	SDL_Convert_S16_to_F32
SDL_AudioFilter	SDL_Convert_U16_to_F32
SDL_AudioFilter	SDL_Convert_S32_to_F32
SDL_AudioFilter	SDL_Convert_F32_to_S8
SDL_AudioFilter	SDL_Convert_F32_to_U8
SDL_AudioFilter	SDL_Convert_F32_to_S16
SDL_AudioFilter	SDL_Convert_F32_to_U16
SDL_AudioFilter	SDL_Convert_F32_to_S32

Macros

Functions

Variables

Macro Definition Documentation

Function Documentation

Variable Documentation