author | Wuzzy <almikes@aol.com> |
Sat, 15 Apr 2017 06:52:14 +0200 | |
changeset 12256 | 789277d46784 |
parent 7813 | 7ac83d79b897 |
permissions | -rw-r--r-- |
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/* |
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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 Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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. |
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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. |
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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 */ |