149 lines
5.5 KiB
C
149 lines
5.5 KiB
C
/*
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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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#ifndef AVUTIL_SAMPLEFMT_H
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#define AVUTIL_SAMPLEFMT_H
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#include "avutil.h"
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/**
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* all in native-endian format
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*/
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enum AVSampleFormat {
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AV_SAMPLE_FMT_NONE = -1,
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AV_SAMPLE_FMT_U8, ///< unsigned 8 bits
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AV_SAMPLE_FMT_S16, ///< signed 16 bits
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AV_SAMPLE_FMT_S32, ///< signed 32 bits
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AV_SAMPLE_FMT_FLT, ///< float
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AV_SAMPLE_FMT_DBL, ///< double
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AV_SAMPLE_FMT_U8P, ///< unsigned 8 bits, planar
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AV_SAMPLE_FMT_S16P, ///< signed 16 bits, planar
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AV_SAMPLE_FMT_S32P, ///< signed 32 bits, planar
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AV_SAMPLE_FMT_FLTP, ///< float, planar
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AV_SAMPLE_FMT_DBLP, ///< double, planar
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AV_SAMPLE_FMT_NB ///< Number of sample formats. DO NOT USE if linking dynamically
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};
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/**
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* Return the name of sample_fmt, or NULL if sample_fmt is not
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* recognized.
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*/
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const char *av_get_sample_fmt_name(enum AVSampleFormat sample_fmt);
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/**
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* Return a sample format corresponding to name, or AV_SAMPLE_FMT_NONE
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* on error.
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*/
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enum AVSampleFormat av_get_sample_fmt(const char *name);
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/**
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* Generate a string corresponding to the sample format with
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* sample_fmt, or a header if sample_fmt is negative.
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*
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* @param buf the buffer where to write the string
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* @param buf_size the size of buf
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* @param sample_fmt the number of the sample format to print the
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* corresponding info string, or a negative value to print the
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* corresponding header.
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* @return the pointer to the filled buffer or NULL if sample_fmt is
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* unknown or in case of other errors
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*/
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char *av_get_sample_fmt_string(char *buf, int buf_size, enum AVSampleFormat sample_fmt);
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#if FF_API_GET_BITS_PER_SAMPLE_FMT
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/**
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* @deprecated Use av_get_bytes_per_sample() instead.
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*/
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attribute_deprecated
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int av_get_bits_per_sample_fmt(enum AVSampleFormat sample_fmt);
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#endif
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/**
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* Return number of bytes per sample.
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*
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* @param sample_fmt the sample format
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* @return number of bytes per sample or zero if unknown for the given
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* sample format
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*/
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int av_get_bytes_per_sample(enum AVSampleFormat sample_fmt);
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/**
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* Check if the sample format is planar.
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*
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* @param sample_fmt the sample format to inspect
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* @return 1 if the sample format is planar, 0 if it is interleaved
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*/
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int av_sample_fmt_is_planar(enum AVSampleFormat sample_fmt);
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/**
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* Get the required buffer size for the given audio parameters.
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*
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* @param[out] linesize calculated linesize, may be NULL
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* @param nb_channels the number of channels
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* @param nb_samples the number of samples in a single channel
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* @param sample_fmt the sample format
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* @return required buffer size, or negative error code on failure
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*/
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int av_samples_get_buffer_size(int *linesize, int nb_channels, int nb_samples,
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enum AVSampleFormat sample_fmt, int align);
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/**
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* Fill channel data pointers and linesize for samples with sample
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* format sample_fmt.
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*
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* The pointers array is filled with the pointers to the samples data:
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* for planar, set the start point of each channel's data within the buffer,
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* for packed, set the start point of the entire buffer only.
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*
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* The linesize array is filled with the aligned size of each channel's data
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* buffer for planar layout, or the aligned size of the buffer for all channels
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* for packed layout.
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*
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* @param[out] audio_data array to be filled with the pointer for each channel
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* @param[out] linesize calculated linesize
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* @param buf the pointer to a buffer containing the samples
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* @param nb_channels the number of channels
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* @param nb_samples the number of samples in a single channel
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* @param sample_fmt the sample format
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* @param align buffer size alignment (1 = no alignment required)
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* @return 0 on success or a negative error code on failure
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*/
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int av_samples_fill_arrays(uint8_t **audio_data, int *linesize, uint8_t *buf,
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int nb_channels, int nb_samples,
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enum AVSampleFormat sample_fmt, int align);
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/**
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* Allocate a samples buffer for nb_samples samples, and fill data pointers and
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* linesize accordingly.
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* The allocated samples buffer can be freed by using av_freep(&audio_data[0])
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*
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* @param[out] audio_data array to be filled with the pointer for each channel
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* @param[out] linesize aligned size for audio buffer(s)
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* @param nb_channels number of audio channels
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* @param nb_samples number of samples per channel
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* @param align buffer size alignment (1 = no alignment required)
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* @return 0 on success or a negative error code on failure
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* @see av_samples_fill_arrays()
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*/
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int av_samples_alloc(uint8_t **audio_data, int *linesize, int nb_channels,
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int nb_samples, enum AVSampleFormat sample_fmt, int align);
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#endif /* AVUTIL_SAMPLEFMT_H */
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