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ffmpeg/libavfilter/ebur128.h

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/*
* Copyright (c) 2011 Jan Kokemüller
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* This file is based on libebur128 which is available at
* https://github.com/jiixyj/libebur128/
*
*/
#ifndef AVFILTER_EBUR128_H
#define AVFILTER_EBUR128_H
/** \file ebur128.h
* \brief libebur128 - a library for loudness measurement according to
* the EBU R128 standard.
*/
#include <stddef.h> /* for size_t */
/** \enum channel
* Use these values when setting the channel map with ebur128_set_channel().
* See definitions in ITU R-REC-BS 1770-4
*/
enum channel {
FF_EBUR128_UNUSED = 0, /**< unused channel (for example LFE channel) */
FF_EBUR128_LEFT,
FF_EBUR128_Mp030 = 1, /**< itu M+030 */
FF_EBUR128_RIGHT,
FF_EBUR128_Mm030 = 2, /**< itu M-030 */
FF_EBUR128_CENTER,
FF_EBUR128_Mp000 = 3, /**< itu M+000 */
FF_EBUR128_LEFT_SURROUND,
FF_EBUR128_Mp110 = 4, /**< itu M+110 */
FF_EBUR128_RIGHT_SURROUND,
FF_EBUR128_Mm110 = 5, /**< itu M-110 */
FF_EBUR128_DUAL_MONO, /**< a channel that is counted twice */
FF_EBUR128_MpSC, /**< itu M+SC */
FF_EBUR128_MmSC, /**< itu M-SC */
FF_EBUR128_Mp060, /**< itu M+060 */
FF_EBUR128_Mm060, /**< itu M-060 */
FF_EBUR128_Mp090, /**< itu M+090 */
FF_EBUR128_Mm090, /**< itu M-090 */
FF_EBUR128_Mp135, /**< itu M+135 */
FF_EBUR128_Mm135, /**< itu M-135 */
FF_EBUR128_Mp180, /**< itu M+180 */
FF_EBUR128_Up000, /**< itu U+000 */
FF_EBUR128_Up030, /**< itu U+030 */
FF_EBUR128_Um030, /**< itu U-030 */
FF_EBUR128_Up045, /**< itu U+045 */
FF_EBUR128_Um045, /**< itu U-030 */
FF_EBUR128_Up090, /**< itu U+090 */
FF_EBUR128_Um090, /**< itu U-090 */
FF_EBUR128_Up110, /**< itu U+110 */
FF_EBUR128_Um110, /**< itu U-110 */
FF_EBUR128_Up135, /**< itu U+135 */
FF_EBUR128_Um135, /**< itu U-135 */
FF_EBUR128_Up180, /**< itu U+180 */
FF_EBUR128_Tp000, /**< itu T+000 */
FF_EBUR128_Bp000, /**< itu B+000 */
FF_EBUR128_Bp045, /**< itu B+045 */
FF_EBUR128_Bm045 /**< itu B-045 */
};
/** \enum mode
* Use these values in ebur128_init (or'ed). Try to use the lowest possible
* modes that suit your needs, as performance will be better.
*/
enum mode {
/** can resurrrect and call ff_ebur128_loudness_momentary */
FF_EBUR128_MODE_M = (1 << 0),
/** can call ff_ebur128_loudness_shortterm */
FF_EBUR128_MODE_S = (1 << 1) | FF_EBUR128_MODE_M,
/** can call ff_ebur128_loudness_global_* and ff_ebur128_relative_threshold */
FF_EBUR128_MODE_I = (1 << 2) | FF_EBUR128_MODE_M,
/** can call ff_ebur128_loudness_range */
FF_EBUR128_MODE_LRA = (1 << 3) | FF_EBUR128_MODE_S,
/** can call ff_ebur128_sample_peak */
FF_EBUR128_MODE_SAMPLE_PEAK = (1 << 4) | FF_EBUR128_MODE_M,
};
/** forward declaration of FFEBUR128StateInternal */
struct FFEBUR128StateInternal;
/** \brief Contains information about the state of a loudness measurement.
*
* You should not need to modify this struct directly.
*/
typedef struct FFEBUR128State {
int mode; /**< The current mode. */
unsigned int channels; /**< The number of channels. */
unsigned long samplerate; /**< The sample rate. */
struct FFEBUR128StateInternal *d; /**< Internal state. */
} FFEBUR128State;
/** \brief Initialize library state.
*
* @param channels the number of channels.
* @param samplerate the sample rate.
* @param window set the maximum window size in ms, set to 0 for auto.
* @param mode see the mode enum for possible values.
* @return an initialized library state.
*/
FFEBUR128State *ff_ebur128_init(unsigned int channels,
unsigned long samplerate,
unsigned long window, int mode);
/** \brief Destroy library state.
*
* @param st pointer to a library state.
*/
void ff_ebur128_destroy(FFEBUR128State ** st);
/** \brief Set channel type.
*
* The default is:
* - 0 -> FF_EBUR128_LEFT
* - 1 -> FF_EBUR128_RIGHT
* - 2 -> FF_EBUR128_CENTER
* - 3 -> FF_EBUR128_UNUSED
* - 4 -> FF_EBUR128_LEFT_SURROUND
* - 5 -> FF_EBUR128_RIGHT_SURROUND
*
* @param st library state.
* @param channel_number zero based channel index.
* @param value channel type from the "channel" enum.
* @return
* - 0 on success.
* - AVERROR(EINVAL) if invalid channel index.
*/
int ff_ebur128_set_channel(FFEBUR128State * st,
unsigned int channel_number, int value);
/** \brief Add frames to be processed.
*
* @param st library state.
* @param src array of source frames. Channels must be interleaved.
* @param frames number of frames. Not number of samples!
*/
void ff_ebur128_add_frames_double(FFEBUR128State * st,
const double *src, size_t frames);
/** \brief Get global integrated loudness in LUFS.
*
* @param st library state.
* @param out integrated loudness in LUFS. -HUGE_VAL if result is negative
* infinity.
* @return
* - 0 on success.
* - AVERROR(EINVAL) if mode "FF_EBUR128_MODE_I" has not been set.
*/
int ff_ebur128_loudness_global(FFEBUR128State * st, double *out);
/** \brief Get short-term loudness (last 3s) in LUFS.
*
* @param st library state.
* @param out short-term loudness in LUFS. -HUGE_VAL if result is negative
* infinity.
* @return
* - 0 on success.
* - AVERROR(EINVAL) if mode "FF_EBUR128_MODE_S" has not been set.
*/
int ff_ebur128_loudness_shortterm(FFEBUR128State * st, double *out);
/** \brief Get loudness range (LRA) of programme in LU.
*
* Calculates loudness range according to EBU 3342.
*
* @param st library state.
* @param out loudness range (LRA) in LU. Will not be changed in case of
* error. AVERROR(EINVAL) will be returned in this case.
* @return
* - 0 on success.
* - AVERROR(EINVAL) if mode "FF_EBUR128_MODE_LRA" has not been set.
*/
int ff_ebur128_loudness_range(FFEBUR128State * st, double *out);
/** \brief Get loudness range (LRA) in LU across multiple instances.
*
* Calculates loudness range according to EBU 3342.
*
* @param sts array of library states.
* @param size length of sts
* @param out loudness range (LRA) in LU. Will not be changed in case of
* error. AVERROR(EINVAL) will be returned in this case.
* @return
* - 0 on success.
* - AVERROR(EINVAL) if mode "FF_EBUR128_MODE_LRA" has not been set.
*/
int ff_ebur128_loudness_range_multiple(FFEBUR128State ** sts,
size_t size, double *out);
/** \brief Get maximum sample peak of selected channel in float format.
*
* @param st library state
* @param channel_number channel to analyse
* @param out maximum sample peak in float format (1.0 is 0 dBFS)
* @return
* - 0 on success.
* - AVERROR(EINVAL) if mode "FF_EBUR128_MODE_SAMPLE_PEAK" has not been set.
* - AVERROR(EINVAL) if invalid channel index.
*/
int ff_ebur128_sample_peak(FFEBUR128State * st,
unsigned int channel_number, double *out);
/** \brief Get relative threshold in LUFS.
*
* @param st library state
* @param out relative threshold in LUFS.
* @return
* - 0 on success.
* - AVERROR(EINVAL) if mode "FF_EBUR128_MODE_I" has not been set.
*/
int ff_ebur128_relative_threshold(FFEBUR128State * st, double *out);
#endif /* AVFILTER_EBUR128_H */
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