mirror of https://git.ffmpeg.org/ffmpeg.git
246 lines
8.8 KiB
C
246 lines
8.8 KiB
C
/*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav is free software; you can redistribute it and/or
|
|
* 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.
|
|
*
|
|
* Libav is distributed in the hope that it will be useful,
|
|
* 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
|
|
* License along with Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef AVUTIL_SAMPLEFMT_H
|
|
#define AVUTIL_SAMPLEFMT_H
|
|
|
|
#include <stdint.h>
|
|
|
|
#include "avutil.h"
|
|
#include "attributes.h"
|
|
|
|
/**
|
|
* @addtogroup lavu_audio
|
|
* @{
|
|
*
|
|
* @defgroup lavu_sampfmts Audio sample formats
|
|
*
|
|
* Audio sample format enumeration and related convenience functions.
|
|
* @{
|
|
*
|
|
*/
|
|
|
|
/**
|
|
* 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:
|
|
*
|
|
* @par
|
|
* 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.
|
|
*/
|
|
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
|
|
|
|
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
|
|
|
|
AV_SAMPLE_FMT_NB ///< Number of sample formats. DO NOT USE if linking dynamically
|
|
};
|
|
|
|
/**
|
|
* 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);
|
|
|
|
/**
|
|
* 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);
|
|
|
|
/**
|
|
* 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);
|
|
|
|
/**
|
|
* Return number of bytes per sample.
|
|
*
|
|
* @param sample_fmt the sample format
|
|
* @return number of bytes per sample or zero if unknown for the given
|
|
* sample format
|
|
*/
|
|
int av_get_bytes_per_sample(enum AVSampleFormat sample_fmt);
|
|
|
|
/**
|
|
* 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);
|
|
|
|
/**
|
|
* 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
|
|
* @param align buffer size alignment (0 = default, 1 = no alignment)
|
|
* @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);
|
|
|
|
/**
|
|
* @}
|
|
*
|
|
* @defgroup lavu_sampmanip Samples manipulation
|
|
*
|
|
* Functions that manipulate audio samples
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* @see enum AVSampleFormat
|
|
* The documentation for AVSampleFormat describes the data layout.
|
|
*
|
|
* @param[out] audio_data array to be filled with the pointer for each channel
|
|
* @param[out] linesize calculated linesize, may be NULL
|
|
* @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
|
|
* @param align buffer size alignment (0 = default, 1 = no alignment)
|
|
* @return 0 on success or a negative error code on failure
|
|
*/
|
|
int av_samples_fill_arrays(uint8_t **audio_data, int *linesize,
|
|
const uint8_t *buf,
|
|
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])
|
|
* Allocated data will be initialized to silence.
|
|
*
|
|
* @see enum AVSampleFormat
|
|
* The documentation for AVSampleFormat describes the data layout.
|
|
*
|
|
* @param[out] audio_data array to be filled with the pointer for each channel
|
|
* @param[out] linesize aligned size for audio buffer(s), may be NULL
|
|
* @param nb_channels number of audio channels
|
|
* @param nb_samples number of samples per channel
|
|
* @param align buffer size alignment (0 = default, 1 = no alignment)
|
|
* @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);
|
|
|
|
/**
|
|
* 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);
|
|
|
|
/**
|
|
* 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);
|
|
|
|
/**
|
|
* @}
|
|
* @}
|
|
*/
|
|
#endif /* AVUTIL_SAMPLEFMT_H */
|