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commit c6b28f46b8116552ec2b38d1d3c8535df28ba7a1

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Author: Anthony Pesch <inolen@gmail.com>
Date:   Fri May 4 20:21:21 2018 -0400

    Added SDL_AUDIO_ALLOW_SAMPLES_CHANGE flag enabling users of SDL_OpenAudioDevice to get
    the sample size of the actual hardware buffer vs having a stream created to handle the
    delta
This commit is contained in:
Sam Lantinga 2018-10-01 09:47:10 -07:00
parent 0a7faa4ae5
commit b251876126
2 changed files with 7 additions and 9 deletions
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3
include/SDL_audio.h
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@ -140,7 +140,8 @@ typedef Uint16 SDL_AudioFormat;
#define SDL_AUDIO_ALLOW_FREQUENCY_CHANGE 0x00000001
#define SDL_AUDIO_ALLOW_FORMAT_CHANGE 0x00000002
#define SDL_AUDIO_ALLOW_CHANNELS_CHANGE 0x00000004
#define SDL_AUDIO_ALLOW_ANY_CHANGE (SDL_AUDIO_ALLOW_FREQUENCY_CHANGE|SDL_AUDIO_ALLOW_FORMAT_CHANGE|SDL_AUDIO_ALLOW_CHANNELS_CHANGE)
#define SDL_AUDIO_ALLOW_SAMPLES_CHANGE 0x00000008
#define SDL_AUDIO_ALLOW_ANY_CHANGE (SDL_AUDIO_ALLOW_FREQUENCY_CHANGE|SDL_AUDIO_ALLOW_FORMAT_CHANGE|SDL_AUDIO_ALLOW_CHANNELS_CHANGE|SDL_AUDIO_ALLOW_SAMPLES_CHANGE)
/* @} */
/* @} *//* Audio flags */

13
src/audio/SDL_audio.c
View File

@ -1324,15 +1324,12 @@ open_audio_device(const char *devname, int iscapture,
build_stream = SDL_TRUE;
}
}
/* !!! FIXME in 2.1: add SDL_AUDIO_ALLOW_SAMPLES_CHANGE flag?
As of 2.0.6, we will build a stream to buffer the difference between
what the app wants to feed and the device wants to eat, so everyone
gets their way. In prior releases, SDL would force the callback to
feed at the rate the device requested, adjusted for resampling.
*/
if (device->spec.samples != obtained->samples) {
build_stream = SDL_TRUE;
if (allowed_changes & SDL_AUDIO_ALLOW_SAMPLES_CHANGE) {
obtained->samples = device->spec.samples;
} else {
build_stream = SDL_TRUE;
}
}
SDL_CalculateAudioSpec(obtained); /* recalc after possible changes. */