samplefmt.h 8.45 KB
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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
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
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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
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * 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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#ifndef AVUTIL_SAMPLEFMT_H
#define AVUTIL_SAMPLEFMT_H
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#include <stdint.h>

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#include "avutil.h"
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#include "attributes.h"
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/**
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 * Audio Sample Formats
 *
 * @par
 * The data described by the sample format is always in native-endian order.
 * Sample values can be expressed by native C types, hence the lack of a signed
 * 24-bit sample format even though it is a common raw audio data format.
 *
 * @par
 * The floating-point formats are based on full volume being in the range
 * [-1.0, 1.0]. Any values outside this range are beyond full volume level.
 *
 * @par
 * The data layout as used in av_samples_fill_arrays() and elsewhere in Libav
 * (such as AVFrame in libavcodec) is as follows:
 *
 * For planar sample formats, each audio channel is in a separate data plane,
 * and linesize is the buffer size, in bytes, for a single plane. All data
 * planes must be the same size. For packed sample formats, only the first data
 * plane is used, and samples for each channel are interleaved. In this case,
 * linesize is the buffer size, in bytes, for the 1 plane.
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 */
enum AVSampleFormat {
    AV_SAMPLE_FMT_NONE = -1,
    AV_SAMPLE_FMT_U8,          ///< unsigned 8 bits
    AV_SAMPLE_FMT_S16,         ///< signed 16 bits
    AV_SAMPLE_FMT_S32,         ///< signed 32 bits
    AV_SAMPLE_FMT_FLT,         ///< float
    AV_SAMPLE_FMT_DBL,         ///< double
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    AV_SAMPLE_FMT_U8P,         ///< unsigned 8 bits, planar
    AV_SAMPLE_FMT_S16P,        ///< signed 16 bits, planar
    AV_SAMPLE_FMT_S32P,        ///< signed 32 bits, planar
    AV_SAMPLE_FMT_FLTP,        ///< float, planar
    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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/**
 * Return the name of sample_fmt, or NULL if sample_fmt is not
 * recognized.
 */
const char *av_get_sample_fmt_name(enum AVSampleFormat sample_fmt);

/**
 * Return a sample format corresponding to name, or AV_SAMPLE_FMT_NONE
 * on error.
 */
enum AVSampleFormat av_get_sample_fmt(const char *name);

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/**
 * Get the packed alternative form of the given sample format.
 *
 * If the passed sample_fmt is already in packed format, the format returned is
 * the same as the input.
 *
 * @return  the packed alternative form of the given sample format or
            AV_SAMPLE_FMT_NONE on error.
 */
enum AVSampleFormat av_get_packed_sample_fmt(enum AVSampleFormat sample_fmt);

/**
 * Get the planar alternative form of the given sample format.
 *
 * If the passed sample_fmt is already in planar format, the format returned is
 * the same as the input.
 *
 * @return  the planar alternative form of the given sample format or
            AV_SAMPLE_FMT_NONE on error.
 */
enum AVSampleFormat av_get_planar_sample_fmt(enum AVSampleFormat sample_fmt);

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/**
 * Generate a string corresponding to the sample format with
 * sample_fmt, or a header if sample_fmt is negative.
 *
 * @param buf the buffer where to write the string
 * @param buf_size the size of buf
 * @param sample_fmt the number of the sample format to print the
 * corresponding info string, or a negative value to print the
 * corresponding header.
 * @return the pointer to the filled buffer or NULL if sample_fmt is
 * unknown or in case of other errors
 */
char *av_get_sample_fmt_string(char *buf, int buf_size, enum AVSampleFormat sample_fmt);

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/**
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 * Return number of bytes per sample.
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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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int av_get_bytes_per_sample(enum AVSampleFormat sample_fmt);
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/**
 * Check if the sample format is planar.
 *
 * @param sample_fmt the sample format to inspect
 * @return 1 if the sample format is planar, 0 if it is interleaved
 */
int av_sample_fmt_is_planar(enum AVSampleFormat sample_fmt);

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/**
 * Get the required buffer size for the given audio parameters.
 *
 * @param[out] linesize calculated linesize, may be NULL
 * @param nb_channels   the number of channels
 * @param nb_samples    the number of samples in a single channel
 * @param sample_fmt    the sample format
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 * @param align         buffer size alignment (0 = default, 1 = no alignment)
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 * @return              required buffer size, or negative error code on failure
 */
int av_samples_get_buffer_size(int *linesize, int nb_channels, int nb_samples,
                               enum AVSampleFormat sample_fmt, int align);

/**
 * Fill channel data pointers and linesize for samples with sample
 * format sample_fmt.
 *
 * The pointers array is filled with the pointers to the samples data:
 * for planar, set the start point of each channel's data within the buffer,
 * for packed, set the start point of the entire buffer only.
 *
 * The linesize array is filled with the aligned size of each channel's data
 * buffer for planar layout, or the aligned size of the buffer for all channels
 * for packed layout.
 *
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 * @see enum AVSampleFormat
 * The documentation for AVSampleFormat describes the data layout.
 *
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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, may be NULL
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 * @param buf              the pointer to a buffer containing the samples
 * @param nb_channels      the number of channels
 * @param nb_samples       the number of samples in a single channel
 * @param sample_fmt       the sample format
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 * @param align            buffer size alignment (0 = default, 1 = no alignment)
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 * @return                 0 on success or a negative error code on failure
 */
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int av_samples_fill_arrays(uint8_t **audio_data, int *linesize,
                           const uint8_t *buf,
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                           int nb_channels, int nb_samples,
                           enum AVSampleFormat sample_fmt, int align);

/**
 * Allocate a samples buffer for nb_samples samples, and fill data pointers and
 * linesize accordingly.
 * The allocated samples buffer can be freed by using av_freep(&audio_data[0])
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 * Allocated data will be initialized to silence.
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 *
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 * @see enum AVSampleFormat
 * The documentation for AVSampleFormat describes the data layout.
 *
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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), may be NULL
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 * @param nb_channels      number of audio channels
 * @param nb_samples       number of samples per channel
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 * @param align            buffer size alignment (0 = default, 1 = no alignment)
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 * @return                 0 on success or a negative error code on failure
 * @see av_samples_fill_arrays()
 */
int av_samples_alloc(uint8_t **audio_data, int *linesize, int nb_channels,
                     int nb_samples, enum AVSampleFormat sample_fmt, int align);

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/**
 * Copy samples from src to dst.
 *
 * @param dst destination array of pointers to data planes
 * @param src source array of pointers to data planes
 * @param dst_offset offset in samples at which the data will be written to dst
 * @param src_offset offset in samples at which the data will be read from src
 * @param nb_samples number of samples to be copied
 * @param nb_channels number of audio channels
 * @param sample_fmt audio sample format
 */
int av_samples_copy(uint8_t **dst, uint8_t * const *src, int dst_offset,
                    int src_offset, int nb_samples, int nb_channels,
                    enum AVSampleFormat sample_fmt);

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/**
 * Fill an audio buffer with silence.
 *
 * @param audio_data  array of pointers to data planes
 * @param offset      offset in samples at which to start filling
 * @param nb_samples  number of samples to fill
 * @param nb_channels number of audio channels
 * @param sample_fmt  audio sample format
 */
int av_samples_set_silence(uint8_t **audio_data, int offset, int nb_samples,
                           int nb_channels, enum AVSampleFormat sample_fmt);

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#endif /* AVUTIL_SAMPLEFMT_H */