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69 lines
2.4 KiB
C
69 lines
2.4 KiB
C
/*
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* Copyright © 2014 Mozilla Foundation
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*
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* This program is made available under an ISC-style license. See the
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* accompanying file LICENSE for details.
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*/
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#ifndef CUBEB_RESAMPLER_H
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#define CUBEB_RESAMPLER_H
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#include "cubeb/cubeb.h"
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#if defined(__cplusplus)
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extern "C" {
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#endif
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typedef struct cubeb_resampler cubeb_resampler;
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typedef enum {
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CUBEB_RESAMPLER_QUALITY_VOIP,
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CUBEB_RESAMPLER_QUALITY_DEFAULT,
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CUBEB_RESAMPLER_QUALITY_DESKTOP
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} cubeb_resampler_quality;
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/**
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* Create a resampler to adapt the requested sample rate into something that
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* is accepted by the audio backend.
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* @param stream A cubeb_stream instance supplied to the data callback.
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* @param params Used to calculate bytes per frame and buffer size for resampling.
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* @param out_rate The sampling rate after resampling.
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* @param callback A callback to request data for resampling.
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* @param buffer_frame_count Maximum number of frames passed to cubeb_resampler_fill
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* as |frames_needed|. This is also used to calculate
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* the size of buffer allocated for resampling.
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* @param user_ptr User data supplied to the data callback.
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* @param quality Quality of the resampler.
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* @retval A non-null pointer if success.
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*/
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cubeb_resampler * cubeb_resampler_create(cubeb_stream * stream,
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cubeb_stream_params params,
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unsigned int out_rate,
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cubeb_data_callback callback,
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long buffer_frame_count,
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void * user_ptr,
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cubeb_resampler_quality quality);
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/**
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* Fill the buffer with frames acquired using the data callback. Resampling will
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* happen if necessary.
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* @param resampler A cubeb_resampler instance.
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* @param buffer The buffer to be filled.
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* @param frames_needed Number of frames that should be produced.
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* @retval Number of frames that are actually produced.
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* @retval CUBEB_ERROR on error.
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*/
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long cubeb_resampler_fill(cubeb_resampler * resampler,
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void * buffer, long frames_needed);
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/**
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* Destroy a cubeb_resampler.
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* @param resampler A cubeb_resampler instance.
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*/
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void cubeb_resampler_destroy(cubeb_resampler * resampler);
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#if defined(__cplusplus)
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}
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#endif
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#endif /* CUBEB_RESAMPLER_H */
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