diff options
Diffstat (limited to 'include/media/AudioResamplerPublic.h')
-rw-r--r-- | include/media/AudioResamplerPublic.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/media/AudioResamplerPublic.h b/include/media/AudioResamplerPublic.h index 3c30148..07d946d 100644 --- a/include/media/AudioResamplerPublic.h +++ b/include/media/AudioResamplerPublic.h @@ -42,6 +42,8 @@ #define AUDIO_TIMESTRETCH_PITCH_MAX 2.0f #define AUDIO_TIMESTRETCH_PITCH_NORMAL 1.0f +// TODO: Consider putting these inlines into a class scope + // Returns the source frames needed to resample to destination frames. This is not a precise // value and depends on the resampler (and possibly how it handles rounding internally). // Nevertheless, this should be an upper bound on the requirements of the resampler. @@ -66,4 +68,13 @@ static inline size_t destinationFramesPossible(size_t srcFrames, uint32_t srcSam return dstFrames > 2 ? dstFrames - 2 : 0; } +static inline size_t sourceFramesNeededWithTimestretch( + uint32_t srcSampleRate, size_t dstFramesRequired, uint32_t dstSampleRate, + float speed) { + // required is the number of input frames the resampler needs + size_t required = sourceFramesNeeded(srcSampleRate, dstFramesRequired, dstSampleRate); + // to deliver this, the time stretcher requires: + return required * (double)speed + 1 + 1; // accounting for rounding dependencies +} + #endif // ANDROID_AUDIO_RESAMPLER_PUBLIC_H |