path: root/src/lib/ffmpeg-2.5/libavutil/samplefmt.pas

(*
 * SampleFormat
 * copyright (c) 2011 Karl-Michael Schindler <karl-michael.schindler@web.de>
 *
 * This library 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 of the License, or (at your option) any later version.
 *
 * This library 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 this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * This is a part of the Pascal port of ffmpeg.
 *
 * Conversion of libavutil/samplefmt.h
 * avutil version 54.7.100
 *
 *)

type
(**
 * @addtogroup lavu_audio
 * @
 *
 * @defgroup lavu_sampfmts Audio sample formats
 *
 * Audio sample format enumeration and related convenience functions.
 * @
 *
 *)

(**
 * Audio sample formats
 *
 * - 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.
 *
 * - 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.
 *
 * - The data layout as used in av_samples_fill_arrays() and elsewhere in FFmpeg
 *   (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.
 *
 *)
  TAVSampleFormat = (
    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
  );
  TAVSampleFormatArray = array [0 .. MaxInt div SizeOf(TAVSampleFormat) - 1] of TAVSampleFormat;
  PAVSampleFormatArray = ^TAVSampleFormatArray;

(**
 * Return the name of sample_fmt, or NULL if sample_fmt is not
 * recognized.
 *)
function av_get_sample_fmt_name(sample_fmt: TAVSampleFormat): {const} PAnsiChar;
  cdecl; external av__util;

(**
 * Return a sample format corresponding to name, or AV_SAMPLE_FMT_NONE
 * on error.
 *)
function av_get_sample_fmt(name: {const} PAnsiChar): TAVSampleFormat;
  cdecl; external av__util;

(**
 * Return the planar<->packed alternative form of the given sample format, or
 * AV_SAMPLE_FMT_NONE on error. If the passed sample_fmt is already in the
 * requested planar/packed format, the format returned is the same as the
 * input.
 *)
function av_get_alt_sample_fmt(sample_fmt: TAVSampleFormat; planar: cint): TAVSampleFormat;
  cdecl; external av__util;

(**
 * 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.
 *)
function av_get_packed_sample_fmt(sample_fmt: TAVSampleFormat): TAVSampleFormat;
  cdecl; external av__util;

(**
 * 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.
 *)
function av_get_planar_sample_fmt(sample_fmt: TAVSampleFormat): TAVSampleFormat;
  cdecl; external av__util;

(**
 * 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
 *)
function av_get_sample_fmt_string(buf: PAnsiChar; buf_size: cint; sample_fmt: TAVSampleFormat): PAnsiChar;
  cdecl; external av__util;

(**
 * 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
 *)
function av_get_bytes_per_sample(sample_fmt: TAVSampleFormat): cint;
  cdecl; external av__util;

type
  OctArrayOfPcuint8 = array[0..7] of Pcuint8;
  OctArrayOfcint    = array[0..7] of cint;

(**
 * 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
 *)
function av_sample_fmt_is_planar(sample_fmt: TAVSampleFormat): cint;
  cdecl; external av__util;

(**
 * 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
 *)
function av_samples_get_buffer_size(linesize: Pcint; nb_channels: cint; nb_samples: cint;
                                    sample_fmt: TAVSampleFormat; align: cint): cint;
  cdecl; external av__util;

(**
 * @
 *
 * @defgroup lavu_sampmanip Samples manipulation
 *
 * Functions that manipulate audio samples
 * @
 *)

(**
 * Fill plane data pointers and linesize for samples with sample
 * format sample_fmt.
 *
 * The audio_data array is filled with the pointers to the samples data planes:
 * 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 value pointed to by linesize is set to the aligned size of each
 * channel's data buffer for planar layout, or to the aligned size of the
 * buffer for all channels for packed layout.
 *
 * The buffer in buf must be big enough to contain all the samples
 * (use av_samples_get_buffer_size() to compute its minimum size),
 * otherwise the audio_data pointers will point to invalid data.
 *
 * @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
 * @todo return minimum size in bytes required for the buffer in case
 * of success at the next bump
 *)
function av_samples_fill_arrays(var audio_data: Pcuint8; linesize: Pcint;
                                buf: Pcuint8;
				nb_channels: cint; nb_samples: cint; 
                                sample_fmt: TAVSampleFormat; align: cint): cint;
  cdecl; external av__util;

(**
 * 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])
 *
 * @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
 * @todo return the size of the allocated buffer in case of success at the next bump
 * @see av_samples_fill_arrays()
 * @see av_samples_alloc_array_and_samples()
 *)
function av_samples_alloc(var audio_data: Pcuint8; linesize: Pcint;
                          nb_channels: cint; nb_samples: cint;
			  sample_fmt: TAVSampleFormat; align: cint): cint;
  cdecl; external av__util;

(**
 * Allocate a data pointers array, samples buffer for nb_samples
 * samples, and fill data pointers and linesize accordingly.
 *
 * This is the same as av_samples_alloc(), but also allocates the data
 * pointers array.
 *
 * @see av_samples_alloc()
 *)
function av_samples_alloc_array_and_samples(var audio_data: Pcuint8; linesize: Pcint;
                                            nb_channels: cint; nb_samples: cint;
			                    sample_fmt: TAVSampleFormat; align: cint): cint;
  cdecl; external av__util;

(**
 * 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
 *)
function av_samples_copy(var dst: Pcuint8; src: {const} Pcuint8; dst_offset: cint;
                         src_offset: cint; nb_samples: cint; nb_channels: cint;
                         sample_fmt: TAVSampleFormat): cint;
  cdecl; external av__util;

(**
 * 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
 *)
function av_samples_set_silence(var audio_data: Pcuint8; offset: cint; nb_samples: cint;
                                nb_channels: cint; sample_fmt: TAVSampleFormat): cint;
  cdecl; external av__util;