FFmpeg
ebur128.h
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1 /*
2  * Copyright (c) 2011 Jan Kokemüller
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  *
20  * This file is based on libebur128 which is available at
21  * https://github.com/jiixyj/libebur128/
22  *
23 */
24 
25 #ifndef AVFILTER_EBUR128_H
26 #define AVFILTER_EBUR128_H
27 
28 /** \file ebur128.h
29  * \brief libebur128 - a library for loudness measurement according to
30  * the EBU R128 standard.
31  */
32 
33 #include <stddef.h> /* for size_t */
34 
35 /** \enum channel
36  * Use these values when setting the channel map with ebur128_set_channel().
37  * See definitions in ITU R-REC-BS 1770-4
38  */
39 enum channel {
40  FF_EBUR128_UNUSED = 0, /**< unused channel (for example LFE channel) */
42  FF_EBUR128_Mp030 = 1, /**< itu M+030 */
44  FF_EBUR128_Mm030 = 2, /**< itu M-030 */
46  FF_EBUR128_Mp000 = 3, /**< itu M+000 */
48  FF_EBUR128_Mp110 = 4, /**< itu M+110 */
50  FF_EBUR128_Mm110 = 5, /**< itu M-110 */
51  FF_EBUR128_DUAL_MONO, /**< a channel that is counted twice */
52  FF_EBUR128_MpSC, /**< itu M+SC */
53  FF_EBUR128_MmSC, /**< itu M-SC */
54  FF_EBUR128_Mp060, /**< itu M+060 */
55  FF_EBUR128_Mm060, /**< itu M-060 */
56  FF_EBUR128_Mp090, /**< itu M+090 */
57  FF_EBUR128_Mm090, /**< itu M-090 */
58  FF_EBUR128_Mp135, /**< itu M+135 */
59  FF_EBUR128_Mm135, /**< itu M-135 */
60  FF_EBUR128_Mp180, /**< itu M+180 */
61  FF_EBUR128_Up000, /**< itu U+000 */
62  FF_EBUR128_Up030, /**< itu U+030 */
63  FF_EBUR128_Um030, /**< itu U-030 */
64  FF_EBUR128_Up045, /**< itu U+045 */
65  FF_EBUR128_Um045, /**< itu U-030 */
66  FF_EBUR128_Up090, /**< itu U+090 */
67  FF_EBUR128_Um090, /**< itu U-090 */
68  FF_EBUR128_Up110, /**< itu U+110 */
69  FF_EBUR128_Um110, /**< itu U-110 */
70  FF_EBUR128_Up135, /**< itu U+135 */
71  FF_EBUR128_Um135, /**< itu U-135 */
72  FF_EBUR128_Up180, /**< itu U+180 */
73  FF_EBUR128_Tp000, /**< itu T+000 */
74  FF_EBUR128_Bp000, /**< itu B+000 */
75  FF_EBUR128_Bp045, /**< itu B+045 */
76  FF_EBUR128_Bm045 /**< itu B-045 */
77 };
78 
79 /** \enum mode
80  * Use these values in ebur128_init (or'ed). Try to use the lowest possible
81  * modes that suit your needs, as performance will be better.
82  */
83 enum mode {
84  /** can resurrrect and call ff_ebur128_loudness_momentary */
85  FF_EBUR128_MODE_M = (1 << 0),
86  /** can call ff_ebur128_loudness_shortterm */
88  /** can call ff_ebur128_loudness_global_* and ff_ebur128_relative_threshold */
90  /** can call ff_ebur128_loudness_range */
92  /** can call ff_ebur128_sample_peak */
94 };
95 
96 /** forward declaration of FFEBUR128StateInternal */
98 
99 /** \brief Contains information about the state of a loudness measurement.
100  *
101  * You should not need to modify this struct directly.
102  */
103 typedef struct FFEBUR128State {
104  int mode; /**< The current mode. */
105  unsigned int channels; /**< The number of channels. */
106  unsigned long samplerate; /**< The sample rate. */
107  struct FFEBUR128StateInternal *d; /**< Internal state. */
109 
110 /** \brief Initialize library state.
111  *
112  * @param channels the number of channels.
113  * @param samplerate the sample rate.
114  * @param window set the maximum window size in ms, set to 0 for auto.
115  * @param mode see the mode enum for possible values.
116  * @return an initialized library state.
117  */
119  unsigned long samplerate,
120  unsigned long window, int mode);
121 
122 /** \brief Destroy library state.
123  *
124  * @param st pointer to a library state.
125  */
127 
128 /** \brief Set channel type.
129  *
130  * The default is:
131  * - 0 -> FF_EBUR128_LEFT
132  * - 1 -> FF_EBUR128_RIGHT
133  * - 2 -> FF_EBUR128_CENTER
134  * - 3 -> FF_EBUR128_UNUSED
135  * - 4 -> FF_EBUR128_LEFT_SURROUND
136  * - 5 -> FF_EBUR128_RIGHT_SURROUND
137  *
138  * @param st library state.
139  * @param channel_number zero based channel index.
140  * @param value channel type from the "channel" enum.
141  * @return
142  * - 0 on success.
143  * - AVERROR(EINVAL) if invalid channel index.
144  */
146  unsigned int channel_number, int value);
147 
148 /** \brief Add frames to be processed.
149  *
150  * @param st library state.
151  * @param src array of source frames. Channels must be interleaved.
152  * @param frames number of frames. Not number of samples!
153  */
155  const double *src, size_t frames);
156 
157 /** \brief Get global integrated loudness in LUFS.
158  *
159  * @param st library state.
160  * @param out integrated loudness in LUFS. -HUGE_VAL if result is negative
161  * infinity.
162  * @return
163  * - 0 on success.
164  * - AVERROR(EINVAL) if mode "FF_EBUR128_MODE_I" has not been set.
165  */
167 
168 /** \brief Get short-term loudness (last 3s) in LUFS.
169  *
170  * @param st library state.
171  * @param out short-term loudness in LUFS. -HUGE_VAL if result is negative
172  * infinity.
173  * @return
174  * - 0 on success.
175  * - AVERROR(EINVAL) if mode "FF_EBUR128_MODE_S" has not been set.
176  */
178 
179 /** \brief Get loudness range (LRA) of programme in LU.
180  *
181  * Calculates loudness range according to EBU 3342.
182  *
183  * @param st library state.
184  * @param out loudness range (LRA) in LU. Will not be changed in case of
185  * error. AVERROR(EINVAL) will be returned in this case.
186  * @return
187  * - 0 on success.
188  * - AVERROR(EINVAL) if mode "FF_EBUR128_MODE_LRA" has not been set.
189  */
190 int ff_ebur128_loudness_range(FFEBUR128State * st, double *out);
191 /** \brief Get loudness range (LRA) in LU across multiple instances.
192  *
193  * Calculates loudness range according to EBU 3342.
194  *
195  * @param sts array of library states.
196  * @param size length of sts
197  * @param out loudness range (LRA) in LU. Will not be changed in case of
198  * error. AVERROR(EINVAL) will be returned in this case.
199  * @return
200  * - 0 on success.
201  * - AVERROR(EINVAL) if mode "FF_EBUR128_MODE_LRA" has not been set.
202  */
204  size_t size, double *out);
205 
206 /** \brief Get maximum sample peak of selected channel in float format.
207  *
208  * @param st library state
209  * @param channel_number channel to analyse
210  * @param out maximum sample peak in float format (1.0 is 0 dBFS)
211  * @return
212  * - 0 on success.
213  * - AVERROR(EINVAL) if mode "FF_EBUR128_MODE_SAMPLE_PEAK" has not been set.
214  * - AVERROR(EINVAL) if invalid channel index.
215  */
217  unsigned int channel_number, double *out);
218 
219 /** \brief Get relative threshold in LUFS.
220  *
221  * @param st library state
222  * @param out relative threshold in LUFS.
223  * @return
224  * - 0 on success.
225  * - AVERROR(EINVAL) if mode "FF_EBUR128_MODE_I" has not been set.
226  */
228 
229 #endif /* AVFILTER_EBUR128_H */
int ff_ebur128_loudness_global(FFEBUR128State *st, double *out)
Get global integrated loudness in LUFS.
Definition: ebur128.c:595
int ff_ebur128_set_channel(FFEBUR128State *st, unsigned int channel_number, int value)
Set channel type.
Definition: ebur128.c:444
itu U+045
Definition: ebur128.h:64
itu U+090
Definition: ebur128.h:66
itu U+110
Definition: ebur128.h:68
itu U-030
Definition: ebur128.h:65
int ff_ebur128_loudness_range(FFEBUR128State *st, double *out)
Get loudness range (LRA) of programme in LU.
Definition: ebur128.c:708
can call ff_ebur128_loudness_global_* and ff_ebur128_relative_threshold
Definition: ebur128.h:89
a channel that is counted twice
Definition: ebur128.h:51
itu T+000
Definition: ebur128.h:73
can call ff_ebur128_sample_peak
Definition: ebur128.h:93
if it could not because there are no more frames
itu M+180
Definition: ebur128.h:60
itu U-090
Definition: ebur128.h:67
itu M-SC
Definition: ebur128.h:53
void ff_ebur128_add_frames_double(FFEBUR128State *st, const double *src, size_t frames)
Add frames to be processed.
itu U+180
Definition: ebur128.h:72
GLsizei GLboolean const GLfloat * value
Definition: opengl_enc.c:108
itu U-030
Definition: ebur128.h:63
itu U-135
Definition: ebur128.h:71
ptrdiff_t size
Definition: opengl_enc.c:100
channels
Definition: aptx.h:33
struct FFEBUR128StateInternal * d
Internal state.
Definition: ebur128.h:107
FFEBUR128State * ff_ebur128_init(unsigned int channels, unsigned long samplerate, unsigned long window, int mode)
Initialize library state.
Definition: ebur128.c:218
itu U+030
Definition: ebur128.h:62
#define src
Definition: vp8dsp.c:255
unsigned long samplerate
The sample rate.
Definition: ebur128.h:106
int ff_ebur128_sample_peak(FFEBUR128State *st, unsigned int channel_number, double *out)
Get maximum sample peak of selected channel in float format.
Definition: ebur128.c:713
can call ff_ebur128_loudness_shortterm
Definition: ebur128.h:87
unused channel (for example LFE channel)
Definition: ebur128.h:40
itu M-110
Definition: ebur128.h:50
itu M-090
Definition: ebur128.h:57
itu B-045
Definition: ebur128.h:76
itu M-030
Definition: ebur128.h:44
can call ff_ebur128_loudness_range
Definition: ebur128.h:91
itu B+000
Definition: ebur128.h:74
static SDL_Window * window
Definition: ffplay.c:366
itu M-060
Definition: ebur128.h:55
Contains information about the state of a loudness measurement.
Definition: ebur128.h:103
itu M-135
Definition: ebur128.h:59
itu M+SC
Definition: ebur128.h:52
itu M+090
Definition: ebur128.h:56
itu M+060
Definition: ebur128.h:54
itu U+000
Definition: ebur128.h:61
void ff_ebur128_destroy(FFEBUR128State **st)
Destroy library state.
Definition: ebur128.c:303
unsigned int channels
The number of channels.
Definition: ebur128.h:105
int mode
The current mode.
Definition: ebur128.h:104
itu M+110
Definition: ebur128.h:48
itu M+030
Definition: ebur128.h:42
int ff_ebur128_relative_threshold(FFEBUR128State *st, double *out)
Get relative threshold in LUFS.
Definition: ebur128.c:579
itu M+000
Definition: ebur128.h:46
can resurrrect and call ff_ebur128_loudness_momentary
Definition: ebur128.h:85
channel
Use these values when setting the channel map with ebur128_set_channel().
Definition: ebur128.h:39
itu U+135
Definition: ebur128.h:70
int ff_ebur128_loudness_shortterm(FFEBUR128State *st, double *out)
Get short-term loudness (last 3s) in LUFS.
Definition: ebur128.c:616
itu B+045
Definition: ebur128.h:75
itu M+135
Definition: ebur128.h:58
itu U-110
Definition: ebur128.h:69
FILE * out
Definition: movenc.c:54
mode
Use these values in ebur128_init (or&#39;ed).
Definition: ebur128.h:83
int ff_ebur128_loudness_range_multiple(FFEBUR128State **sts, size_t size, double *out)
Get loudness range (LRA) in LU across multiple instances.
Definition: ebur128.c:631