forked from KolibriOS/kolibrios
150 lines
4.3 KiB
C
150 lines
4.3 KiB
C
/*
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* Audio FIFO
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* Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Audio FIFO Buffer
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*/
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#ifndef AVUTIL_AUDIO_FIFO_H
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#define AVUTIL_AUDIO_FIFO_H
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#include "avutil.h"
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#include "fifo.h"
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#include "samplefmt.h"
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/**
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* @addtogroup lavu_audio
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* @{
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*/
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/**
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* Context for an Audio FIFO Buffer.
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*
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* - Operates at the sample level rather than the byte level.
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* - Supports multiple channels with either planar or packed sample format.
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* - Automatic reallocation when writing to a full buffer.
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*/
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typedef struct AVAudioFifo AVAudioFifo;
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/**
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* Free an AVAudioFifo.
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*
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* @param af AVAudioFifo to free
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*/
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void av_audio_fifo_free(AVAudioFifo *af);
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/**
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* Allocate an AVAudioFifo.
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*
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* @param sample_fmt sample format
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* @param channels number of channels
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* @param nb_samples initial allocation size, in samples
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* @return newly allocated AVAudioFifo, or NULL on error
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*/
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AVAudioFifo *av_audio_fifo_alloc(enum AVSampleFormat sample_fmt, int channels,
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int nb_samples);
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/**
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* Reallocate an AVAudioFifo.
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*
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* @param af AVAudioFifo to reallocate
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* @param nb_samples new allocation size, in samples
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* @return 0 if OK, or negative AVERROR code on failure
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*/
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int av_audio_fifo_realloc(AVAudioFifo *af, int nb_samples);
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/**
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* Write data to an AVAudioFifo.
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*
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* The AVAudioFifo will be reallocated automatically if the available space
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* is less than nb_samples.
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*
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* @see enum AVSampleFormat
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* The documentation for AVSampleFormat describes the data layout.
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*
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* @param af AVAudioFifo to write to
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* @param data audio data plane pointers
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* @param nb_samples number of samples to write
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* @return number of samples actually written, or negative AVERROR
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* code on failure. If successful, the number of samples
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* actually written will always be nb_samples.
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*/
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int av_audio_fifo_write(AVAudioFifo *af, void **data, int nb_samples);
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/**
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* Read data from an AVAudioFifo.
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*
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* @see enum AVSampleFormat
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* The documentation for AVSampleFormat describes the data layout.
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*
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* @param af AVAudioFifo to read from
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* @param data audio data plane pointers
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* @param nb_samples number of samples to read
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* @return number of samples actually read, or negative AVERROR code
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* on failure. The number of samples actually read will not
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* be greater than nb_samples, and will only be less than
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* nb_samples if av_audio_fifo_size is less than nb_samples.
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*/
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int av_audio_fifo_read(AVAudioFifo *af, void **data, int nb_samples);
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/**
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* Drain data from an AVAudioFifo.
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*
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* Removes the data without reading it.
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*
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* @param af AVAudioFifo to drain
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* @param nb_samples number of samples to drain
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* @return 0 if OK, or negative AVERROR code on failure
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*/
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int av_audio_fifo_drain(AVAudioFifo *af, int nb_samples);
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/**
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* Reset the AVAudioFifo buffer.
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*
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* This empties all data in the buffer.
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*
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* @param af AVAudioFifo to reset
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*/
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void av_audio_fifo_reset(AVAudioFifo *af);
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/**
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* Get the current number of samples in the AVAudioFifo available for reading.
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*
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* @param af the AVAudioFifo to query
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* @return number of samples available for reading
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*/
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int av_audio_fifo_size(AVAudioFifo *af);
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/**
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* Get the current number of samples in the AVAudioFifo available for writing.
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*
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* @param af the AVAudioFifo to query
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* @return number of samples available for writing
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*/
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int av_audio_fifo_space(AVAudioFifo *af);
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/**
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* @}
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*/
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#endif /* AVUTIL_AUDIO_FIFO_H */
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