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297 lines
11 KiB
C
297 lines
11 KiB
C
/*
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* Copyright (c) 2011 Jan Kokemüller
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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* This file is based on libebur128 which is available at
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* https://github.com/jiixyj/libebur128/
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*
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*/
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#ifndef AVFILTER_EBUR128_H
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#define AVFILTER_EBUR128_H
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/** \file ebur128.h
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* \brief libebur128 - a library for loudness measurement according to
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* the EBU R128 standard.
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*/
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#include <stddef.h> /* for size_t */
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/** \enum channel
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* Use these values when setting the channel map with ebur128_set_channel().
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* See definitions in ITU R-REC-BS 1770-4
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*/
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enum channel {
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FF_EBUR128_UNUSED = 0, /**< unused channel (for example LFE channel) */
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FF_EBUR128_LEFT,
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FF_EBUR128_Mp030 = 1, /**< itu M+030 */
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FF_EBUR128_RIGHT,
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FF_EBUR128_Mm030 = 2, /**< itu M-030 */
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FF_EBUR128_CENTER,
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FF_EBUR128_Mp000 = 3, /**< itu M+000 */
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FF_EBUR128_LEFT_SURROUND,
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FF_EBUR128_Mp110 = 4, /**< itu M+110 */
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FF_EBUR128_RIGHT_SURROUND,
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FF_EBUR128_Mm110 = 5, /**< itu M-110 */
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FF_EBUR128_DUAL_MONO, /**< a channel that is counted twice */
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FF_EBUR128_MpSC, /**< itu M+SC */
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FF_EBUR128_MmSC, /**< itu M-SC */
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FF_EBUR128_Mp060, /**< itu M+060 */
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FF_EBUR128_Mm060, /**< itu M-060 */
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FF_EBUR128_Mp090, /**< itu M+090 */
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FF_EBUR128_Mm090, /**< itu M-090 */
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FF_EBUR128_Mp135, /**< itu M+135 */
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FF_EBUR128_Mm135, /**< itu M-135 */
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FF_EBUR128_Mp180, /**< itu M+180 */
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FF_EBUR128_Up000, /**< itu U+000 */
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FF_EBUR128_Up030, /**< itu U+030 */
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FF_EBUR128_Um030, /**< itu U-030 */
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FF_EBUR128_Up045, /**< itu U+045 */
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FF_EBUR128_Um045, /**< itu U-030 */
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FF_EBUR128_Up090, /**< itu U+090 */
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FF_EBUR128_Um090, /**< itu U-090 */
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FF_EBUR128_Up110, /**< itu U+110 */
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FF_EBUR128_Um110, /**< itu U-110 */
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FF_EBUR128_Up135, /**< itu U+135 */
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FF_EBUR128_Um135, /**< itu U-135 */
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FF_EBUR128_Up180, /**< itu U+180 */
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FF_EBUR128_Tp000, /**< itu T+000 */
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FF_EBUR128_Bp000, /**< itu B+000 */
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FF_EBUR128_Bp045, /**< itu B+045 */
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FF_EBUR128_Bm045 /**< itu B-045 */
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};
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/** \enum mode
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* Use these values in ebur128_init (or'ed). Try to use the lowest possible
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* modes that suit your needs, as performance will be better.
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*/
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enum mode {
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/** can call ff_ebur128_loudness_momentary */
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FF_EBUR128_MODE_M = (1 << 0),
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/** can call ff_ebur128_loudness_shortterm */
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FF_EBUR128_MODE_S = (1 << 1) | FF_EBUR128_MODE_M,
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/** can call ff_ebur128_loudness_global_* and ff_ebur128_relative_threshold */
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FF_EBUR128_MODE_I = (1 << 2) | FF_EBUR128_MODE_M,
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/** can call ff_ebur128_loudness_range */
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FF_EBUR128_MODE_LRA = (1 << 3) | FF_EBUR128_MODE_S,
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/** can call ff_ebur128_sample_peak */
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FF_EBUR128_MODE_SAMPLE_PEAK = (1 << 4) | FF_EBUR128_MODE_M,
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};
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/** forward declaration of FFEBUR128StateInternal */
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struct FFEBUR128StateInternal;
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/** \brief Contains information about the state of a loudness measurement.
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*
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* You should not need to modify this struct directly.
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*/
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typedef struct {
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int mode; /**< The current mode. */
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unsigned int channels; /**< The number of channels. */
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unsigned long samplerate; /**< The sample rate. */
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struct FFEBUR128StateInternal *d; /**< Internal state. */
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} FFEBUR128State;
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/** \brief Initialize library state.
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*
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* @param channels the number of channels.
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* @param samplerate the sample rate.
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* @param window set the maximum window size in ms, set to 0 for auto.
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* @param mode see the mode enum for possible values.
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* @return an initialized library state.
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*/
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FFEBUR128State *ff_ebur128_init(unsigned int channels,
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unsigned long samplerate,
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unsigned long window, int mode);
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/** \brief Destroy library state.
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*
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* @param st pointer to a library state.
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*/
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void ff_ebur128_destroy(FFEBUR128State ** st);
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/** \brief Set channel type.
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*
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* The default is:
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* - 0 -> FF_EBUR128_LEFT
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* - 1 -> FF_EBUR128_RIGHT
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* - 2 -> FF_EBUR128_CENTER
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* - 3 -> FF_EBUR128_UNUSED
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* - 4 -> FF_EBUR128_LEFT_SURROUND
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* - 5 -> FF_EBUR128_RIGHT_SURROUND
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*
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* @param st library state.
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* @param channel_number zero based channel index.
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* @param value channel type from the "channel" enum.
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* @return
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* - 0 on success.
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* - AVERROR(EINVAL) if invalid channel index.
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*/
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int ff_ebur128_set_channel(FFEBUR128State * st,
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unsigned int channel_number, int value);
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/** \brief Add frames to be processed.
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*
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* @param st library state.
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* @param src array of source frames. Channels must be interleaved.
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* @param frames number of frames. Not number of samples!
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*/
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void ff_ebur128_add_frames_short(FFEBUR128State * st,
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const short *src, size_t frames);
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/** \brief See \ref ebur128_add_frames_short */
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void ff_ebur128_add_frames_int(FFEBUR128State * st,
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const int *src, size_t frames);
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/** \brief See \ref ebur128_add_frames_short */
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void ff_ebur128_add_frames_float(FFEBUR128State * st,
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const float *src, size_t frames);
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/** \brief See \ref ebur128_add_frames_short */
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void ff_ebur128_add_frames_double(FFEBUR128State * st,
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const double *src, size_t frames);
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/** \brief Add frames to be processed.
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*
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* @param st library state.
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* @param srcs array of source frame channel data pointers
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* @param frames number of frames. Not number of samples!
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* @param stride number of samples to skip to for the next sample of the same channel
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*/
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void ff_ebur128_add_frames_planar_short(FFEBUR128State * st,
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const short **srcs,
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size_t frames, int stride);
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/** \brief See \ref ebur128_add_frames_planar_short */
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void ff_ebur128_add_frames_planar_int(FFEBUR128State * st,
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const int **srcs,
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size_t frames, int stride);
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/** \brief See \ref ebur128_add_frames_planar_short */
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void ff_ebur128_add_frames_planar_float(FFEBUR128State * st,
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const float **srcs,
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size_t frames, int stride);
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/** \brief See \ref ebur128_add_frames_planar_short */
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void ff_ebur128_add_frames_planar_double(FFEBUR128State * st,
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const double **srcs,
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size_t frames, int stride);
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/** \brief Get global integrated loudness in LUFS.
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*
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* @param st library state.
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* @param out integrated loudness in LUFS. -HUGE_VAL if result is negative
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* infinity.
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* @return
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* - 0 on success.
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* - AVERROR(EINVAL) if mode "FF_EBUR128_MODE_I" has not been set.
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*/
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int ff_ebur128_loudness_global(FFEBUR128State * st, double *out);
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/** \brief Get global integrated loudness in LUFS across multiple instances.
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*
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* @param sts array of library states.
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* @param size length of sts
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* @param out integrated loudness in LUFS. -HUGE_VAL if result is negative
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* infinity.
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* @return
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* - 0 on success.
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* - AVERROR(EINVAL) if mode "FF_EBUR128_MODE_I" has not been set.
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*/
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int ff_ebur128_loudness_global_multiple(FFEBUR128State ** sts,
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size_t size, double *out);
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/** \brief Get momentary loudness (last 400ms) in LUFS.
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*
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* @param st library state.
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* @param out momentary loudness in LUFS. -HUGE_VAL if result is negative
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* infinity.
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* @return
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* - 0 on success.
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*/
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int ff_ebur128_loudness_momentary(FFEBUR128State * st, double *out);
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/** \brief Get short-term loudness (last 3s) in LUFS.
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*
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* @param st library state.
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* @param out short-term loudness in LUFS. -HUGE_VAL if result is negative
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* infinity.
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* @return
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* - 0 on success.
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* - AVERROR(EINVAL) if mode "FF_EBUR128_MODE_S" has not been set.
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*/
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int ff_ebur128_loudness_shortterm(FFEBUR128State * st, double *out);
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/** \brief Get loudness of the specified window in LUFS.
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*
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* window must not be larger than the current window set in st.
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*
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* @param st library state.
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* @param window window in ms to calculate loudness.
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* @param out loudness in LUFS. -HUGE_VAL if result is negative infinity.
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* @return
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* - 0 on success.
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* - AVERROR(EINVAL) if window larger than current window in st.
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*/
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int ff_ebur128_loudness_window(FFEBUR128State * st,
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unsigned long window, double *out);
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/** \brief Get loudness range (LRA) of programme in LU.
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*
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* Calculates loudness range according to EBU 3342.
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*
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* @param st library state.
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* @param out loudness range (LRA) in LU. Will not be changed in case of
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* error. AVERROR(EINVAL) will be returned in this case.
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* @return
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* - 0 on success.
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* - AVERROR(EINVAL) if mode "FF_EBUR128_MODE_LRA" has not been set.
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*/
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int ff_ebur128_loudness_range(FFEBUR128State * st, double *out);
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/** \brief Get loudness range (LRA) in LU across multiple instances.
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*
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* Calculates loudness range according to EBU 3342.
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*
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* @param sts array of library states.
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* @param size length of sts
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* @param out loudness range (LRA) in LU. Will not be changed in case of
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* error. AVERROR(EINVAL) will be returned in this case.
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* @return
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* - 0 on success.
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* - AVERROR(EINVAL) if mode "FF_EBUR128_MODE_LRA" has not been set.
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*/
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int ff_ebur128_loudness_range_multiple(FFEBUR128State ** sts,
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size_t size, double *out);
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/** \brief Get maximum sample peak of selected channel in float format.
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*
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* @param st library state
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* @param channel_number channel to analyse
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* @param out maximum sample peak in float format (1.0 is 0 dBFS)
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* @return
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* - 0 on success.
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* - AVERROR(EINVAL) if mode "FF_EBUR128_MODE_SAMPLE_PEAK" has not been set.
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* - AVERROR(EINVAL) if invalid channel index.
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*/
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int ff_ebur128_sample_peak(FFEBUR128State * st,
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unsigned int channel_number, double *out);
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/** \brief Get relative threshold in LUFS.
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*
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* @param st library state
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* @param out relative threshold in LUFS.
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* @return
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* - 0 on success.
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* - AVERROR(EINVAL) if mode "FF_EBUR128_MODE_I" has not been set.
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*/
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int ff_ebur128_relative_threshold(FFEBUR128State * st, double *out);
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#endif /* AVFILTER_EBUR128_H */
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