├── main.lua
├── README.md
├── LICENSE
├── skipsilence.lua
└── images
    └── detection.svg


/main.lua:
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1 | skipsilence.lua


--------------------------------------------------------------------------------
/README.md:
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  1 | # mpv-skipsilence
  2 | 
  3 | Increase playback speed during silence - a revolution in attention-deficit
  4 | induction technology.
  5 | 
  6 | Main repository: https://codeberg.org/ferreum/mpv-skipsilence/
  7 | 
  8 | Based on the script https://gist.github.com/bitingsock/e8a56446ad9c1ed92d872aeb38edf124
  9 | 
 10 | This is inspired by the NewPipe app's built-in "Fast-forward during silence"
 11 | feature.
 12 | 
 13 | > Note: In mpv version 0.36 and below, the `scaletempo2` filter (default since
 14 | > mpv version 0.34) caused audio-video de-synchronization when changing speed
 15 | > a lot. This has been fixed in mpv 0.37. See [mpv issue
 16 | > #12028](https://github.com/mpv-player/mpv/issues/12028). Small, frequent
 17 | > speed changes instead of large steps may help to reduce this problem. The
 18 | > scaletempo and rubberband filters didn't have this problem, but have
 19 | > different audio quality characteristics.
 20 | 
 21 | ## Features:
 22 | 
 23 | - Parameterized speedup ramp, allowing profiles for different kinds of
 24 |   media (`ramp_*`, `speed_*`, `startdelay` options).
 25 | - Noise reduction of the detected signal. This allows to speed up
 26 |   pauses in speech despite background noise. The output audio is
 27 |   unaffected by default (`arnndn_*` options).
 28 | - Saved time estimation.
 29 | - Integration with osd-msg, auto profiles, etc. (with user-data, mpv 0.36 and
 30 |   above only).
 31 | - Experimental: Lookahead for dynamic slowdown and faster reaction time
 32 |   (`lookahead`, `slowdown_ramp_*`, `margin_*` options).
 33 | - Workaround for scaletempo2 audio-video desynchronization in mpv 0.36 and
 34 |   below (`resync_threshold_droppedframes` option).
 35 | - Workaround for clicks during speed changes with scaletempo2 in mpv 0.36 and
 36 |   below (`alt_normal_speed` option).
 37 | 
 38 | ### Silence detection visualized
 39 | 
 40 | The following graph shows an example silence detection and resulting playback
 41 | speed, annotated with options that impact speed changes.
 42 | 
 43 | ![silence detection visualization](./images/detection.svg)
 44 | 
 45 | If the experimental `lookahead` option is set to a positive value, the effect
 46 | of some options changes:
 47 | 
 48 | <sup>1)</sup> Without lookahead, `Silence Start` is delayed by
 49 | `threshold_duration`. If lookahead is active, it reduces this delay by up to
 50 | that configured lookahead duration.
 51 | 
 52 | <sup>2)</sup> `minduration` is only supported with lookahead.
 53 | 
 54 | <sup>3)</sup> `startdelay` is ignored if lookahead is enabled and
 55 | `margin_start` is used instead.
 56 | 
 57 | <sup>4)</sup> The box marked `if lookahead` only applies if lookahead is
 58 | active. Otherwise, the speed is reverted in a single step exactly at the time
 59 | of `Silence End` detection.
 60 | 
 61 | ## Default bindings
 62 | 
 63 | - F2 - toggle
 64 | - F3 - threshold-down
 65 | - F4 - threshold-up
 66 | 
 67 | ## Documentation
 68 | 
 69 | For detailed usage check the comments at the top of the [script](skipsilence.lua).
 70 | 
 71 | ## Recommendations
 72 | 
 73 | ### Temporarily disable display sync
 74 | 
 75 | When using `video-sync=display-*`, speed changes tend to cause increased video
 76 | lag. Because display sync is less useful while speed keeps changing, it's
 77 | recommended to use `video-sync=audio` (the default) while this script is
 78 | active. This results in smoother video playback during speed transitions.
 79 | 
 80 | The following profile can be used to automatically switch to `video-sync=audio`
 81 | when skipsilence is enabled and restore it when disabled (requires mpv 0.36 or
 82 | above for user-data):
 83 | 
 84 |     [auto-skipsilence-videosync]
 85 |     profile-cond=get("user-data/skipsilence/enabled")
 86 |     profile-restore=copy-equal
 87 |     video-sync=audio
 88 | 
 89 | ### Fix clicking sounds/gaps when switching to and from 1x speed
 90 | 
 91 | In the default configuration, mpv automatically inserts scaletempo2 filter when
 92 | changing speed and removes it when returning to 1x playback speed. This often
 93 | causes clicks in audio playback. To prevent this, add `scaletempo2` to the `af`
 94 | filter list explicitly:
 95 | 
 96 |     af-add=scaletempo2
 97 | 
 98 | In mpv 0.36 and below, the scaletempo2 filter itself additionally caused
 99 | similar artifacts when switching to and from 1x speed. This has been fixed in
100 | mpv 0.37. The `alt_normal_speed` option of this script is a workaround for
101 | older versions.
102 | 
103 | ### Fix silence at high playback speed
104 | 
105 | By default, scaletempo2 produces silence above 8x playback speed (4x in mpv
106 | 0.36 and below). To lift this limit, set the `max-speed` parameter in the
107 | filter definition (see above) like this:
108 | 
109 |     af-add=scaletempo2=max-speed=32.0
110 | 
111 | ### Maximize skipping speed
112 | 
113 | Because of the asynchronous nature of scripts, there is latency between silence
114 | detection and speed changes. The higher the playback speed, the more noticeably
115 | playback will overshoot before normal speed is restored. What speeds are
116 | acceptable depends on the performance/latency of the system.
117 | 
118 | To maximize skipping speed, start with the extreme profile (see
119 | [Profiles](#profiles) below). Then adjust `ramp_constant`, `ramp_factor`,
120 | `max_speed` options as needed.
121 | 
122 | - If overshooting happens all the time, even for very short pauses, reduce
123 |   `ramp_constant`.
124 | - If it happens after the speed ramped up more, focus on `ramp_factor`.
125 | - For the occasional long stretch of silence this may be less of a problem, but
126 |   can be improved by reducing `max_speed` at a cost of slower skipping.
127 | - Notice that extreme values of `ramp_exponent` tend to be less useful. It's
128 |   recommended to keep the `ramp_exponent` around 0.9 for aggressive profiles.
129 | 
130 | #### Lookahead
131 | 
132 | The experimental lookahead option makes much higher maximum speed practical by
133 | gradually slowing down before the end of silence is reached. See the
134 | `lookahead`, `slowdown_ramp_*` and `margin_*` options. To maximize skipping
135 | speed, use a slowdown ramp that is as steep as possible without overshooting on
136 | slowdown. `margin_end` can help, but is usually not required.
137 | 
138 | ### Profiles
139 | 
140 | Mpv's profiles can be used to switch between different presets. Create profiles
141 | in `mpv.conf` and apply them with the `apply-profile` command.
142 | 
143 |     [skipsilence-default]
144 |     script-opts-append=skipsilence-ramp_constant=1.25
145 |     script-opts-append=skipsilence-ramp_factor=2.5
146 |     script-opts-append=skipsilence-ramp_exponent=1
147 |     script-opts-append=skipsilence-speed_max=4
148 |     script-opts-append=skipsilence-speed_updateinterval=0.05
149 |     script-opts-append=skipsilence-startdelay=0.05
150 | 
151 | Bind it to a key in `input.conf`:
152 | 
153 |     F5 script-message-to skipsilence enable no-osd; apply-profile skipsilence-default; show-text "skipsilence profile: default"
154 | 
155 | #### Examples
156 | 
157 |     # very smooth speed increase, up to 3x
158 |     [skipsilence-smooth]
159 |     script-opts-append=skipsilence-ramp_constant=1
160 |     script-opts-append=skipsilence-ramp_factor=0.4
161 |     script-opts-append=skipsilence-ramp_exponent=1.45
162 |     script-opts-append=skipsilence-speed_max=3
163 |     script-opts-append=skipsilence-speed_updateinterval=0.05
164 |     script-opts-append=skipsilence-startdelay=0
165 |     script-opts-append=skipsilence-threshold_duration=0.25
166 | 
167 |     # very aggressive skipping, can make it hard to listen
168 |     [skipsilence-extreme]
169 |     script-opts-append=skipsilence-ramp_constant=2.5
170 |     script-opts-append=skipsilence-ramp_factor=10
171 |     script-opts-append=skipsilence-ramp_exponent=0.9
172 |     script-opts-append=skipsilence-speed_max=6
173 |     script-opts-append=skipsilence-speed_updateinterval=0.05
174 |     script-opts-append=skipsilence-startdelay=0
175 |     script-opts-append=skipsilence-threshold_duration=0.05
176 | 
177 |     # long wait (1s) before speeding up quickly
178 |     [skipsilence-patient]
179 |     script-opts-append=skipsilence-ramp_constant=1.25
180 |     script-opts-append=skipsilence-ramp_factor=3
181 |     script-opts-append=skipsilence-ramp_exponent=0.9
182 |     script-opts-append=skipsilence-speed_max=4
183 |     script-opts-append=skipsilence-speed_updateinterval=0.05
184 |     script-opts-append=skipsilence-startdelay=0
185 |     script-opts-append=skipsilence-threshold_duration=1
186 | 
187 | #### Examples with lookahead
188 | 
189 | These use the advanced lookahead feature. It works better with much higher
190 | skipping speeds.
191 | 
192 | These use the same `lookahead` duration (1s) and `threshold_duration`, so
193 | switching between them does not cause a playback interruption.
194 | 
195 |     # Good default profile with smooth speed-up and slow-down.
196 |     [skipsilence-normal]
197 |     script-opts-append=skipsilence-lookahead=1
198 |     script-opts-append=skipsilence-ramp_constant=1.25
199 |     script-opts-append=skipsilence-ramp_factor=2.5
200 |     script-opts-append=skipsilence-ramp_exponent=1
201 |     script-opts-append=skipsilence-speed_max=6
202 |     script-opts-append=skipsilence-minduration=0.05
203 |     script-opts-append=skipsilence-margin_start=0.03
204 |     script-opts-append=skipsilence-margin_end=0.02
205 |     script-opts-append=skipsilence-speed_updateinterval=0.02
206 |     script-opts-append=skipsilence-threshold_duration=0.025
207 |     script-opts-append=skipsilence-slowdown_ramp_constant=1
208 |     script-opts-append=skipsilence-slowdown_ramp_factor=3
209 |     script-opts-append=skipsilence-slowdown_ramp_exponent=.5
210 | 
211 |     # Very extreme speed-up and slow-down. You can increase max_speed even
212 |     # higher to skip longer pauses even faster. Make sure you have an updated
213 |     # mpv and unlocked scaletempo2 max-speed parameter (see above).
214 |     [skipsilence-extreme]
215 |     script-opts-append=skipsilence-lookahead=1
216 |     script-opts-append=skipsilence-ramp_constant=5
217 |     script-opts-append=skipsilence-ramp_factor=32
218 |     script-opts-append=skipsilence-ramp_exponent=.9
219 |     script-opts-append=skipsilence-speed_max=16
220 |     script-opts-append=skipsilence-minduration=0.05
221 |     script-opts-append=skipsilence-margin_start=0.05
222 |     script-opts-append=skipsilence-margin_end=0
223 |     script-opts-append=skipsilence-speed_updateinterval=0.02
224 |     script-opts-append=skipsilence-threshold_duration=0.025
225 |     script-opts-append=skipsilence-slowdown_ramp_constant=1.25
226 |     script-opts-append=skipsilence-slowdown_ramp_factor=20
227 |     script-opts-append=skipsilence-slowdown_ramp_exponent=.5
228 | 
229 |     # Very smooth speed-up and slow-down, max_speed 2.5
230 |     [skipsilence-smooth]
231 |     script-opts-append=skipsilence-lookahead=1
232 |     script-opts-append=skipsilence-ramp_constant=1
233 |     script-opts-append=skipsilence-ramp_factor=1.5
234 |     script-opts-append=skipsilence-ramp_exponent=1.2
235 |     script-opts-append=skipsilence-speed_max=2.5
236 |     script-opts-append=skipsilence-minduration=0.25
237 |     script-opts-append=skipsilence-margin_start=0.05
238 |     script-opts-append=skipsilence-margin_end=0.05
239 |     script-opts-append=skipsilence-speed_updateinterval=0.02
240 |     script-opts-append=skipsilence-threshold_duration=0.025
241 |     script-opts-append=skipsilence-slowdown_ramp_constant=1
242 |     script-opts-append=skipsilence-slowdown_ramp_factor=1.5
243 |     script-opts-append=skipsilence-slowdown_ramp_exponent=.8
244 | 


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/LICENSE:
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276 | YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
277 | PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
278 | POSSIBILITY OF SUCH DAMAGES.
279 | 
280 |                      END OF TERMS AND CONDITIONS
281 | 
282 |             How to Apply These Terms to Your New Programs
283 | 
284 |   If you develop a new program, and you want it to be of the greatest
285 | possible use to the public, the best way to achieve this is to make it
286 | free software which everyone can redistribute and change under these terms.
287 | 
288 |   To do so, attach the following notices to the program.  It is safest
289 | to attach them to the start of each source file to most effectively
290 | convey the exclusion of warranty; and each file should have at least
291 | the "copyright" line and a pointer to where the full notice is found.
292 | 
293 |     <one line to give the program's name and a brief idea of what it does.>
294 |     Copyright (C) <year>  <name of author>
295 | 
296 |     This program is free software; you can redistribute it and/or modify
297 |     it under the terms of the GNU General Public License as published by
298 |     the Free Software Foundation; either version 2 of the License, or
299 |     (at your option) any later version.
300 | 
301 |     This program is distributed in the hope that it will be useful,
302 |     but WITHOUT ANY WARRANTY; without even the implied warranty of
303 |     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
304 |     GNU General Public License for more details.
305 | 
306 |     You should have received a copy of the GNU General Public License along
307 |     with this program; if not, write to the Free Software Foundation, Inc.,
308 |     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
309 | 
310 | Also add information on how to contact you by electronic and paper mail.
311 | 
312 | If the program is interactive, make it output a short notice like this
313 | when it starts in an interactive mode:
314 | 
315 |     Gnomovision version 69, Copyright (C) year name of author
316 |     Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
317 |     This is free software, and you are welcome to redistribute it
318 |     under certain conditions; type `show c' for details.
319 | 
320 | The hypothetical commands `show w' and `show c' should show the appropriate
321 | parts of the General Public License.  Of course, the commands you use may
322 | be called something other than `show w' and `show c'; they could even be
323 | mouse-clicks or menu items--whatever suits your program.
324 | 
325 | You should also get your employer (if you work as a programmer) or your
326 | school, if any, to sign a "copyright disclaimer" for the program, if
327 | necessary.  Here is a sample; alter the names:
328 | 
329 |   Yoyodyne, Inc., hereby disclaims all copyright interest in the program
330 |   `Gnomovision' (which makes passes at compilers) written by James Hacker.
331 | 
332 |   <signature of Ty Coon>, 1 April 1989
333 |   Ty Coon, President of Vice
334 | 
335 | This General Public License does not permit incorporating your program into
336 | proprietary programs.  If your program is a subroutine library, you may
337 | consider it more useful to permit linking proprietary applications with the
338 | library.  If this is what you want to do, use the GNU Lesser General
339 | Public License instead of this License.
340 | 


--------------------------------------------------------------------------------
/skipsilence.lua:
--------------------------------------------------------------------------------
   1 | -- Increase playback speed during silence - a revolution in attention-deficit
   2 | -- induction technology.
   3 | --
   4 | -- Main repository: https://codeberg.org/ferreum/mpv-skipsilence/
   5 | --
   6 | -- Based on the script https://gist.github.com/bitingsock/e8a56446ad9c1ed92d872aeb38edf124
   7 | --
   8 | -- This is inspired by the NewPipe app's built-in "Fast-forward during silence"
   9 | -- feature.
  10 | --
  11 | -- Note: In mpv version 0.36 and below, the `scaletempo2` filter (default since
  12 | -- mpv version 0.34) caused audio-video de-synchronization when changing speed
  13 | -- a lot. This has been fixed in mpv 0.37. See [mpv issue
  14 | -- #12028](https://github.com/mpv-player/mpv/issues/12028). Small, frequent
  15 | -- speed changes instead of large steps may help to reduce this problem. The
  16 | -- scaletempo and rubberband filters didn't have this problem, but have
  17 | -- different audio quality characteristics.
  18 | --
  19 | -- Features:
  20 | -- - Parameterized speedup ramp, allowing profiles for different kinds of
  21 | --   media (ramp_*, speed_*, startdelay options).
  22 | -- - Noise reduction of the detected signal. This allows to speed up
  23 | --   pauses in speech despite background noise. The output audio is
  24 | --   unaffected by default (arnndn_* options).
  25 | -- - Saved time estimation.
  26 | -- - Integration with osd-msg, auto profiles, etc. (with user-data, mpv 0.36
  27 | --   and above only).
  28 | -- - Experimental: Lookahead for dynamic slowdown and faster reaction time
  29 | --   (`lookahead`, `slowdown_ramp_*`, `margin_*` options).
  30 | -- - Workaround for scaletempo2 audio-video desynchronization in mpv 0.36 and
  31 | --   below (resync_threshold_droppedframes option).
  32 | -- - Workaround for clicks during speed changes with scaletempo2 in mpv 0.36
  33 | --   and below (alt_normal_speed option).
  34 | --
  35 | -- Default bindings:
  36 | --
  37 | -- F2 - toggle
  38 | -- F3 - threshold-down
  39 | -- F4 - threshold-up
  40 | --
  41 | -- All supported bindings (bind with 'script-binding skipsilence/<name>'):
  42 | --
  43 | -- enable - enable the script, if it wasn't enabled.
  44 | -- disable - disable the script, if it was enabled.
  45 | -- toggle - toggle the script
  46 | -- threshold-down - decrease threshold_db by 1 (reduce amount skipped)
  47 | -- threshold-up - increase threshold_db by 1 (increase amount skipped)
  48 | -- info - show state info in osd
  49 | -- reset-total - reset total saved time statistic
  50 | -- cycle-info-style - cycle the infostyle option
  51 | -- toggle-arnndn - toggle the arnndn_enable option
  52 | -- toggle-arnndn-output - toggle the arnndn_output option
  53 | --
  54 | -- Script messages (use with 'script-message-to skipsilence <msg> ...'):
  55 | --
  56 | -- adjust-threshold-db <n>
  57 | --      Adjust threshold_db by n.
  58 | -- enable [no-osd]
  59 | --      Enable the script. Passing 'no-osd' suppresses the osd message.
  60 | -- disable [<speed>] [no-osd]
  61 | --      Disable the script. If speed is specified, set the playback speed to
  62 | --      the given value instead of the normal playback speed. Passing 'no-osd'
  63 | --      suppresses the osd message.
  64 | -- toggle [no-osd]
  65 | --      Toggle the script. Passing 'no-osd' suppresses the osd message.
  66 | -- info [<style>]
  67 | --      Show state as osd message. If style is specified, use it instead of
  68 | --      the infostyle option. Defaults to "verbose" if "off".
  69 | -- adjust-speed add|multiply|set <n>
  70 | --      During silence, adjust the base speed by adding it to n, multiplying
  71 | --      it with n, or setting it to n. This allows changing speed more
  72 | --      reliably than the apply_speed_change option.
  73 | --
  74 | --      Usage:
  75 | --      - Ensure that apply_speed_change is 'off' (default)
  76 | --      - Add an adjust-speed message to every speed change binding like so:
  77 | --
  78 | --          } multiply speed 2; script-message-to skipsilence adjust-speed multiply 2
  79 | --          ] add speed 0.1; script-message-to skipsilence adjust-speed add 0.1
  80 | --          X set speed 1; script-message-to skipsilence adjust-speed set 1
  81 | --
  82 | --      This is designed such that these bindings still work without
  83 | --      skipsilence being loaded.
  84 | --
  85 | -- User-data (mpv 0.36 and above):
  86 | --
  87 | -- user-data/skipsilence/enabled
  88 | --      true/false according to enabled state
  89 | -- user-data/skipsilence/base_speed
  90 | --      the original playback speed. Only updated while the script is enabled.
  91 | -- user-data/skipsilence/info
  92 | --      the current info according to the infostyle option
  93 | -- user-data/skipsilence/saved_total
  94 | --      the total time saved in seconds
  95 | --
  96 | -- These allow showing the state in osd like this:
  97 | --
  98 | --      osd-msg3=...${?user-data/skipsilence/enabled==true:S}...${user-data/skipsilence/info}
  99 | --
 100 | -- This shows "S" when skipsilence is enabled and shows the selected infostyle
 101 | -- in the next lines (infostyle=compact recommended).
 102 | --
 103 | -- Configuration:
 104 | --
 105 | -- For how to use these options, search the mpv man page for 'script-opts',
 106 | -- 'change-list', 'Key/value list options', and 'Configuration' for the
 107 | -- 'script-opts/osc.conf' documentation.
 108 | -- Use the prefix 'skipsilence' (unless the script was renamed).
 109 | local opts = {
 110 |     -- Whether skipsilence should be enabled by default. Can also be changed
 111 |     -- at runtime and reflects the current enabled state.
 112 |     enabled = false,
 113 | 
 114 |     -- The silence threshold in decibel. Anything quieter than this is
 115 |     -- detected as silence. Can be adjusted with the threshold-up,
 116 |     -- threshold-down bindings, and adjust-threshold-db script message.
 117 |     threshold_db = -30,
 118 |     -- Minimum duration of silence to be detected, in seconds. This is
 119 |     -- measured in seconds of stream time, as if playback speed was 1.
 120 |     threshold_duration = 0.1,
 121 |     -- How long to wait before speedup. This is measured in seconds of real
 122 |     -- time, thus higher playback speeds would reduce the length of content
 123 |     -- skipped.
 124 |     --
 125 |     -- Ignored while `lookahead` is used. Use `margin_start` instead.
 126 |     startdelay = 0.05,
 127 | 
 128 |     -- How long to look ahead to allow slowing down ahead of end of silence.
 129 |     --
 130 |     -- EXPERIMENTAL: Enabling this completely changes internal timing logic. It
 131 |     -- may be less reliable than operation without lookahead.
 132 |     --
 133 |     -- Low values (~0.2s) tend to make filter adjustments (threshold_*) more
 134 |     -- jarring because of skipped audio. Higher values (~1.0s) cause a seek
 135 |     -- event instead, which may be less problematic. Do not set this too high,
 136 |     -- as it introduces additional buffering and could reduce timing precision.
 137 |     --
 138 |     -- Recommended values are between 0.5 and 1.0.
 139 |     --
 140 |     -- Option filter_persistent should be enabled for seamless toggling of the
 141 |     -- script.
 142 |     lookahead = 0,
 143 | 
 144 |     -- EXPERIMENTAL: For lookahead: Extra margin at start and end of detected
 145 |     -- silence. `margin_start` delays speed-up, `margin_end` slows down
 146 |     -- earlier, by the specified time.
 147 |     --
 148 |     -- Measured in seconds of stream time. Negative values are allowed, having
 149 |     -- the opposite effect.
 150 |     --
 151 |     -- Requires lookahead to be active. Maximum backwards adjustment is limited
 152 |     -- by the lookahead period (positive `margin_end` or negative
 153 |     -- `margin_start`).
 154 |     margin_start = 0.05,
 155 |     margin_end = 0,
 156 | 
 157 |     -- EXPERIMENTAL: For lookahead: minimum length of silence for speed to be
 158 |     -- increased. This is a way to extend `threshold_duration` without needing
 159 |     -- to update the filter.
 160 |     --
 161 |     -- Increases the required duration of silence, without delaying the
 162 |     -- starting point like startdelay (by up to the lookahead duration).
 163 |     -- Measured in seconds of stream time.
 164 |     minduration = 0,
 165 | 
 166 |     -- How often to update the speed during silence, in seconds of real time.
 167 |     speed_updateinterval = 0.05,
 168 |     -- The maximum playback speed during silence.
 169 |     speed_max = 4,
 170 | 
 171 |     -- Speedup ramp parameters. The formula for playback speedup is:
 172 |     --
 173 |     --     ramp_constant + (time * ramp_factor) ^ ramp_exponent
 174 |     --
 175 |     -- Where time is the real time in seconds passed since start of speedup.
 176 |     -- The result is multiplied with the original playback speed.
 177 |     --
 178 |     -- - ramp_constant should always be greater or equal to one, otherwise it
 179 |     --   will slow down at the start of silence.
 180 |     -- - Setting ramp_factor to 0 disables the ramp, resulting in a constant
 181 |     --   speed during silence.
 182 |     -- - ramp_exponent is the "acceleration" of the curve. A value of 1
 183 |     --   results in a linear curve, values above 1 increase the speed faster
 184 |     --   the more time has passed, while values below 1 speed up at
 185 |     --   decreasing intervals.
 186 |     ramp_constant = 1.25,
 187 |     ramp_factor = 2.5,
 188 |     ramp_exponent = 1,
 189 | 
 190 |     -- EXPERIMENTAL: Same as ramp_* options, but for slowdown when using
 191 |     -- lookahead. 'time' is the remaining time to the end of silence.
 192 |     -- Note this is measured in stream time, different from the ramp_*
 193 |     -- options, which use real time. Choose a lower exponent to compensate.
 194 |     --
 195 |     -- While slowdown ramp is active, always the lower speed calculated by the
 196 |     -- two ramps is used.
 197 |     slowdown_ramp_constant = 1,
 198 |     slowdown_ramp_factor = 3,
 199 |     slowdown_ramp_exponent = 0.6,
 200 | 
 201 |     -- Noise reduction filter configuration.
 202 |     --
 203 |     -- This allows removing noise from the audio stream before the
 204 |     -- silencedetect filter, allowing to speed up pauses in speech despite
 205 |     -- background noise. The output audio is unaffected by default.
 206 |     --
 207 |     -- Whether the detected audio signal should be preprocessed with arnndn.
 208 |     -- If arnndn_modelpath is empty, this has no effect
 209 |     arnndn_enable = true,
 210 |     -- Path to the rnnn file containing the model parameters. If empty,
 211 |     -- noise reduction is disabled.
 212 |     -- The value is expanded with the expand-path command. See "Paths" in the
 213 |     -- mpv manual.
 214 |     -- Avoid special characters in this option, they must be escaped to
 215 |     -- work with "af add lavfi=[arnndn='...']".
 216 |     arnndn_modelpath = "",
 217 |     -- Whether the denoised signal should be used as the output. Disabled by
 218 |     -- default, so the output is unaffected.
 219 |     arnndn_output = false,
 220 | 
 221 |     -- If >= 0, use this value instead of a playback speed of 1.
 222 |     -- This is a work around to stop audio clicks when switching between
 223 |     -- normal playback and speeding up. Playing back at a slightly different
 224 |     -- speed (e.g. 1.01x), keeps the scaletempo2 filter active, so audio is
 225 |     -- played back without interruptions.
 226 |     alt_normal_speed = -1,
 227 | 
 228 |     -- Workaround for audio-video de-synchronization with scaletempo2 in
 229 |     -- mpv 0.36 and below. When disabling skipsilence, fix audio sync if this
 230 |     -- many frames have been dropped since the last playback restart
 231 |     -- (seek, etc.). Disabled if value is less than 0.
 232 |     --
 233 |     -- When disabling skipsilence while frame-drop-count is greater or equal
 234 |     -- to configured value, audio-video sync is fixed by running
 235 |     -- 'seek 0 exact'. May produce a short pause and/or audio repeat.
 236 |     --
 237 |     -- Note that frame-drop-count does not exactly correspond to the
 238 |     -- audio-video desynchronization. It is used as a heuristic to avoid
 239 |     -- resyncing every time the script is disabled. Recommended value: 100.
 240 |     resync_threshold_droppedframes = -1,
 241 | 
 242 |     -- Keep the filter added while the script is disabled. This prevents
 243 |     -- most audio interruptions/clicks when toggling the script.
 244 |     -- If arnndn_output is enabled, noise reduction also stays active while
 245 |     -- the script is disabled.
 246 |     filter_persistent = false,
 247 | 
 248 |     -- Info style used for the 'user-data/skipsilence/info' property and
 249 |     -- the default of the 'info' script-message/binding.
 250 |     -- May be one of
 251 |     -- - 'off' (no information),
 252 |     -- - 'total' (show total saved time),
 253 |     -- - 'compact' (show total and latest saved time),
 254 |     -- - 'verbose' (show most information).
 255 |     infostyle = "off",
 256 | 
 257 |     -- When to reset the total saved time.
 258 |     -- May be one of
 259 |     -- - 'file-start' (when a new file starts)
 260 |     -- - 'never' (do not reset total)
 261 |     reset_total = "file-start",
 262 | 
 263 |     -- How to apply external speed change during silence.
 264 |     -- This makes speed change bindings work during fast forward. Set the
 265 |     -- value according to what command you use to change speed:
 266 |     -- - 'add' - add the difference to the normal speed
 267 |     -- - 'multiply' - multiply the normal speed with factor of change
 268 |     -- If 'off', the script will override the speed during silence.
 269 |     -- Note: this option is unreliable in cases where the script changes speed
 270 |     -- at the exact same time. Prefer the adjust-speed message instead.
 271 |     apply_speed_change = "off",
 272 | 
 273 |     debug = false,
 274 | }
 275 | 
 276 | local is_enabled = false
 277 | local base_speed = 1
 278 | local is_silent = false
 279 | local is_filter_added = false
 280 | local filter_lookahead = 0
 281 | local filter_threshold_duration = 0
 282 | local expected_speed = 1
 283 | local last_speed_change_time = -1
 284 | local filter_reapply_time = -1
 285 | local is_paused = false
 286 | local total_saved_time = 0
 287 | 
 288 | local latest_speed = 1
 289 | local filter_restarted = false
 290 | local filter_restart_time_pos = nil
 291 | local input_ref_pts = nil
 292 | local input_ref_time = 0
 293 | local input_ref_pause_time = nil
 294 | 
 295 | local events_ifirst = 1
 296 | local events_ilast = 0
 297 | local events = {}
 298 | 
 299 | local check_time_timer = nil
 300 | local reapply_filter_timer = nil
 301 | 
 302 | local detect_filter_label = mp.get_script_name() .. "_silencedetect"
 303 | local detect_filter_ffmpeg_id = mp.get_script_name() .. "_detection"
 304 | 
 305 | local function dprint(...)
 306 |     if opts.debug then
 307 |         print(("%.3f"):format(mp.get_time()), ...)
 308 |     end
 309 | end
 310 | 
 311 | -- like math.min with 2 args, but ignore nil
 312 | local function take_lower(a, b)
 313 |     if not a then return b end
 314 |     if not b then return a end
 315 |     if a < b then return a end
 316 |     return b
 317 | end
 318 | 
 319 | -- Get current detection filter input pts.
 320 | -- Precondition: requires `input_ref_pts` to be set.
 321 | local function get_input_pts(opt_now)
 322 |     local now = input_ref_pause_time or opt_now or mp.get_time()
 323 |     return input_ref_pts + (now - input_ref_time) * latest_speed
 324 | end
 325 | 
 326 | -- Estimate input time based on time-pos.
 327 | -- This is needed to cover the initial filter period of lookahead length,
 328 | -- because these events arrive before playback starts.
 329 | local function estimate_input_time(now)
 330 |     local time_pos = mp.get_property_number("time-pos")
 331 |     if time_pos then
 332 |         local buff = mp.get_property_number("audio-buffer", 0.2)
 333 |         input_ref_pts = time_pos + buff * latest_speed + filter_lookahead
 334 |         input_ref_time = now
 335 |         filter_restart_time_pos = input_ref_pts
 336 |         if is_paused then
 337 |             input_ref_pause_time = now
 338 |         end
 339 |         dprint("estimated input time:", input_ref_pts)
 340 |     else
 341 |         -- wait for core-idle false to estimate time
 342 |         filter_restarted = true
 343 |         filter_restart_time_pos = nil
 344 |     end
 345 | end
 346 | 
 347 | local function get_silence_filter()
 348 |     local filter = "silencedetect@"..detect_filter_ffmpeg_id
 349 |         .."=n="..opts.threshold_db.."dB:d="..opts.threshold_duration
 350 |     local branch_detection = false
 351 |     local split_prefix = ""
 352 | 
 353 |     if opts.arnndn_enable and opts.arnndn_modelpath ~= "" then
 354 |         local path = mp.command_native{"expand-path", opts.arnndn_modelpath}
 355 |         local rnn = "arnndn='"..path.."',"
 356 | 
 357 |         if opts.lookahead > 0 and opts.arnndn_output then
 358 |             split_prefix = rnn
 359 |         else
 360 |             filter = rnn..filter
 361 |             -- arnndn requires 48kHz float; request it before asplit so amix
 362 |             -- does not require a second conversion for original audio
 363 |             split_prefix = "aformat=f=fltp:r=48000,"
 364 |             if not opts.arnndn_output then
 365 |                 branch_detection = true
 366 |             end
 367 |         end
 368 |     end
 369 | 
 370 |     if opts.lookahead > 0 then
 371 |         -- Cut off beginning of audio after silencedetect filter. This causes
 372 |         -- detection to run ahead of the current audio playback.
 373 |         filter = filter..",asetpts=PTS-STARTPTS,atrim=start="..opts.lookahead
 374 |         branch_detection = true
 375 |         -- amix ends output early by the lookahead amount. Pad input with
 376 |         -- silence to fix this.
 377 |         split_prefix = split_prefix.."apad=pad_dur="..opts.lookahead..","
 378 |     end
 379 | 
 380 |     if branch_detection then
 381 |         -- need amix to keep the detection filter branch advancing with
 382 |         -- the playback stream. Weights only keep the original audio.
 383 |         --
 384 |         -- Parameter "duration" doesn't seem to affect output cutoff problem
 385 |         -- with lookahead. Explicit duration=shortest chosen that ought to
 386 |         -- resemble the required behavior for the workaround.
 387 |         filter = split_prefix.."asplit[ao],"..filter..",[ao]amix='weights=1 0':normalize=0:duration=shortest"
 388 |     end
 389 | 
 390 |     return "@"..detect_filter_label..":lavfi=["..filter.."]"
 391 | end
 392 | 
 393 | local function clear_events()
 394 |     events_ifirst = 1
 395 |     events_ilast = 0
 396 |     events = {}
 397 | end
 398 | 
 399 | local function drop_event()
 400 |     local i = events_ifirst
 401 |     assert(i <= events_ilast, "event list is empty")
 402 |     events[i] = nil
 403 |     events_ifirst = i + 1
 404 | end
 405 | 
 406 | local function drop_last_event()
 407 |     local i = events_ilast
 408 |     assert(i >= events_ifirst, "event list is empty")
 409 |     events[i] = nil
 410 |     events_ilast = i - 1
 411 | end
 412 | 
 413 | local speed_stats
 414 | local function stats_clear()
 415 |     speed_stats = {
 416 |         saved_current = 0,
 417 |         period_current = 0,
 418 |         silence_start_time = 0,
 419 |         time = nil,
 420 |         speed = 1,
 421 |         pause_start_time = nil,
 422 |     }
 423 | end
 424 | stats_clear()
 425 | 
 426 | local function get_saved_time(now)
 427 |     local s = speed_stats
 428 |     if not s.time then
 429 |         return s.saved_current, s.period_current
 430 |     end
 431 |     local period = (s.pause_start_time or now) - s.time
 432 |     local period_orig = period * s.speed / base_speed
 433 |     local saved = period_orig - period
 434 |     -- avoid negative value caused by float precision
 435 |     if saved > -0.001 and saved <= 0 then saved = 0 end
 436 |     return s.saved_current + saved, s.period_current + period_orig
 437 | end
 438 | 
 439 | local function stats_accumulate(now, speed)
 440 |     local s = speed_stats
 441 |     s.saved_current, s.period_current = get_saved_time(now)
 442 |     s.time = s.pause_start_time or now
 443 |     s.speed = speed
 444 | end
 445 | 
 446 | local function stats_start_current(now, speed)
 447 |     local s = speed_stats
 448 |     s.saved_current = 0
 449 |     s.period_current = 0
 450 |     s.silence_start_time = s.pause_start_time or now
 451 |     s.time = s.pause_start_time or now
 452 |     s.speed = speed
 453 | end
 454 | 
 455 | local function stats_end_current(now)
 456 |     local s = speed_stats
 457 |     stats_accumulate(now, s.speed)
 458 |     total_saved_time = total_saved_time + s.saved_current
 459 |     s.silence_start_time = nil
 460 |     s.time = nil
 461 | end
 462 | 
 463 | local function stats_handle_pause(now, pause)
 464 |     local s = speed_stats
 465 |     if pause then
 466 |         if not s.pause_start_time then
 467 |             s.pause_start_time = now
 468 |         end
 469 |     else
 470 |         if s.pause_start_time and is_silent then
 471 |             local pause_delta = now - s.pause_start_time
 472 |             s.silence_start_time = s.silence_start_time + pause_delta
 473 |             s.time = s.time + pause_delta
 474 |         end
 475 |         s.pause_start_time = nil
 476 |     end
 477 | end
 478 | 
 479 | local function stats_silence_length(now)
 480 |     local s = speed_stats
 481 |     return (s.pause_start_time or now) - s.silence_start_time
 482 | end
 483 | 
 484 | local function get_current_stats(now)
 485 |     local s = speed_stats
 486 |     local saved, period_current = get_saved_time(now)
 487 |     local saved_total = total_saved_time + (s.time and saved or 0)
 488 |     return saved_total, period_current, saved
 489 | end
 490 | 
 491 | local function format_info(style, saved_total, period_current, saved)
 492 |     if style == "total" then
 493 |         return ("Saved total: %.3fs"):format(saved_total)
 494 |     end
 495 | 
 496 |     local s_stats = ("Saved total: %.3fs\nLatest: %.3fs, %.3fs saved")
 497 |         :format(saved_total, period_current, saved)
 498 |     if style == "compact" then
 499 |         return s_stats
 500 |     end
 501 | 
 502 |     local s_threshold, s_lookahead
 503 |     if filter_lookahead > 0 then
 504 |         s_threshold = ("Threshold: %gdB, %gs (min: %gs)\n")
 505 |                 :format(opts.threshold_db, opts.threshold_duration, opts.minduration)
 506 |             ..("Margin start: %gs, End: %gs\n")
 507 |                 :format(opts.margin_start, opts.margin_end)
 508 |         s_lookahead = ("Lookahead: %gs\n")
 509 |                 :format(filter_lookahead)
 510 |             ..("Slowdown ramp: %g + (time * %g) ^ %g\n")
 511 |                 :format(opts.slowdown_ramp_constant, opts.slowdown_ramp_factor, opts.slowdown_ramp_exponent)
 512 |     else
 513 |         s_threshold = ("Threshold: %+gdB, %gs (+%gs)\n")
 514 |             :format(opts.threshold_db, opts.threshold_duration, opts.startdelay)
 515 |         s_lookahead = ""
 516 |     end
 517 | 
 518 |     return "Status: "..(is_enabled and "enabled" or "disabled").."\n"
 519 |         ..s_threshold
 520 |         .."Arnndn: "..(opts.arnndn_enable and opts.arnndn_modelpath ~= ""
 521 |                         and "enabled"..(opts.arnndn_output and " with output" or "") or "disabled").."\n"
 522 |         ..("Speedup ramp: %g + (time * %g) ^ %g\n")
 523 |             :format(opts.ramp_constant, opts.ramp_factor, opts.ramp_exponent)
 524 |         ..s_lookahead
 525 |         ..("Max speed: %gx, Update interval: %gs\n")
 526 |             :format(opts.speed_max, opts.speed_updateinterval)
 527 |         ..s_stats
 528 | end
 529 | 
 530 | local function update_info(opt_now)
 531 |     local now = opt_now or mp.get_time()
 532 |     local saved_total, period_current, saved = get_current_stats(now)
 533 |     mp.set_property("user-data/skipsilence/saved_total", ("%.3f"):format(saved_total))
 534 |     if opts.infostyle == "total" or opts.infostyle == "compact" or opts.infostyle == "verbose" then
 535 |         local s = speed_stats
 536 |         if (opts.infostyle == "total" or opts.infostyle == "compact")
 537 |             and saved_total + s.saved_current == 0 and s.time == nil then
 538 |             return false
 539 |         end
 540 |         local text = format_info(opts.infostyle, saved_total, period_current, saved)
 541 |         mp.set_property("user-data/skipsilence/info", "\n"..text)
 542 |         return true
 543 |     end
 544 |     return false
 545 | end
 546 | 
 547 | local function update_info_now(opt_now)
 548 |     if not update_info(opt_now) then
 549 |         mp.set_property("user-data/skipsilence/info", "")
 550 |     end
 551 | end
 552 | 
 553 | local update_info_timer = nil
 554 | local function schedule_update_info(opt_now)
 555 |     if is_enabled and not is_paused and is_silent then
 556 |         if not update_info_timer then
 557 |             -- long fractional part to prevent stats digits from lining up
 558 |             -- with update interval
 559 |             update_info_timer = mp.add_periodic_timer(0.0217, update_info)
 560 |         else
 561 |             update_info_timer:resume()
 562 |         end
 563 |     else
 564 |         if update_info_timer then
 565 |             update_info_timer:kill()
 566 |         end
 567 |     end
 568 |     update_info_now(opt_now)
 569 | end
 570 | 
 571 | local function set_base_speed(speed)
 572 |     base_speed = speed
 573 |     mp.set_property_number("user-data/skipsilence/base_speed", speed)
 574 | end
 575 | 
 576 | local function update_filter_opts()
 577 |     filter_lookahead = opts.lookahead
 578 |     filter_threshold_duration = opts.threshold_duration
 579 | end
 580 | 
 581 | local function reapply_filter()
 582 |     -- debounce with timer to avoid disrupting playback with repeated calls
 583 |     if reapply_filter_timer then
 584 |         reapply_filter_timer:kill()
 585 |     end
 586 |     reapply_filter_timer = mp.add_timeout(0.4, function()
 587 |         dprint("reapply filter")
 588 |         clear_events()
 589 | 
 590 |         local now = mp.get_time()
 591 |         -- remember last time filters were changed. Used to preserve
 592 |         -- silence state when changing options in some cases.
 593 |         -- Note: lookahead tends to case a backwards seek event on filter
 594 |         -- change, which prevents handling this.
 595 |         filter_reapply_time = now
 596 | 
 597 |         mp.commandv("af", "pre", get_silence_filter())
 598 |         update_filter_opts()
 599 |         update_info_now(now)
 600 |         estimate_input_time(now)
 601 |     end)
 602 | end
 603 | 
 604 | local function clear_silence_state()
 605 |     if is_silent then
 606 |         stats_end_current(mp.get_time())
 607 |         expected_speed = base_speed
 608 |         mp.set_property_number("speed", base_speed)
 609 |     end
 610 |     clear_events()
 611 |     is_silent = false
 612 |     input_ref_pts = nil
 613 |     input_ref_time = nil
 614 |     input_ref_pause_time = nil
 615 |     if check_time_timer ~= nil then
 616 |         check_time_timer:kill()
 617 |     end
 618 | end
 619 | 
 620 | local schedule_check_time -- function
 621 | local function check_time()
 622 |     local now = mp.get_time()
 623 |     local input_pts = nil
 624 |     local prev_speed = mp.get_property_number("speed")
 625 | 
 626 |     local new_speed = prev_speed
 627 |     local did_change = false
 628 |     local was_silent = is_silent
 629 |     local next_delay = nil
 630 |     local next_delay_pts = nil
 631 | 
 632 |     local index_current = events_ifirst
 633 | 
 634 |     for index = events_ifirst, events_ilast do
 635 |         local ev = events[index]
 636 | 
 637 |         if filter_lookahead > 0 then
 638 |             -- calc time based on pts while lookahead
 639 |             if not input_pts then
 640 |                 input_pts = get_input_pts(now)
 641 |             end
 642 | 
 643 |             local offset
 644 |             if ev.is_silent then
 645 |                 offset = opts.margin_start
 646 |             else
 647 |                 offset = -opts.margin_end
 648 |             end
 649 |             local remaining_pts = offset + (ev.pts - input_pts) + filter_lookahead
 650 | 
 651 |             if ev.is_silent and opts.minduration > 0 and not events[index+1] then
 652 |                 remaining_pts = math.max(remaining_pts,
 653 |                     ev.pts + opts.minduration - input_pts)
 654 |             end
 655 | 
 656 |             dprint("input_pts:", input_pts, "ev.pts:", ev.pts, "remaining:", remaining_pts)
 657 |             if remaining_pts > 0 then
 658 |                 next_delay_pts = remaining_pts
 659 |                 break
 660 |             end
 661 |         else
 662 |             local remaining = 0
 663 |             if ev.is_silent ~= was_silent then
 664 |                 if ev.is_silent then
 665 |                     remaining = opts.startdelay - (now - ev.recv_time)
 666 |                 else
 667 |                     -- events on filter reapply:
 668 |                     -- 1. filters removed and added
 669 |                     -- 2. (if silent)
 670 |                     --    silence end message
 671 |                     -- 3. (if still silent for new filter)
 672 |                     --    silence start message
 673 |                     --
 674 |                     -- wait before stopping the gap after reapply to preserve
 675 |                     -- speed if playback is still silent
 676 |                     remaining = 0.05 - (now - ev.filter_cleanup_time)
 677 |                 end
 678 |             end
 679 |             if remaining > 0 and not events[index+1] then
 680 |                 dprint("recheck in", remaining)
 681 |                 next_delay = remaining
 682 |                 break
 683 |             end
 684 |         end
 685 | 
 686 |         if ev.is_silent ~= is_silent then
 687 |             is_silent = ev.is_silent
 688 |             did_change = true
 689 |             ev.current = true
 690 |         end
 691 |         index_current = index
 692 |     end
 693 | 
 694 |     -- drop outdated events
 695 |     for _ = events_ifirst, index_current-1 do
 696 |         drop_event()
 697 |     end
 698 | 
 699 |     if did_change then
 700 |         if was_silent then
 701 |             stats_end_current(now)
 702 | 
 703 |             dprint("silence end, saved:", get_saved_time(now, prev_speed))
 704 |             new_speed = base_speed
 705 |         end
 706 |         if is_silent then
 707 |             stats_start_current(now, new_speed)
 708 |             dprint("silence start")
 709 | 
 710 |             if not was_silent then
 711 |                 local new_base_speed = prev_speed
 712 |                 if opts.alt_normal_speed >= 0 and math.abs(prev_speed - 1) < 0.001 then
 713 |                     new_base_speed = opts.alt_normal_speed
 714 |                     new_speed = new_base_speed
 715 |                 end
 716 |                 if new_base_speed ~= base_speed then
 717 |                     set_base_speed(new_base_speed)
 718 |                 end
 719 |             end
 720 |             last_speed_change_time = -1
 721 |         end
 722 |         schedule_update_info(now)
 723 |     end
 724 |     if is_silent then
 725 |         local remaining = opts.speed_updateinterval - (now - last_speed_change_time)
 726 |         if remaining > 0 then
 727 |             dprint("last speed change too recent; recheck in", remaining)
 728 |             next_delay = take_lower(next_delay, remaining)
 729 |         else
 730 |             local s = base_speed * (opts.ramp_constant
 731 |                 + (stats_silence_length(now) * opts.ramp_factor) ^ opts.ramp_exponent)
 732 |             if next_delay_pts then
 733 |                 s = math.min(s, base_speed * (opts.slowdown_ramp_constant
 734 |                     + (next_delay_pts * opts.slowdown_ramp_factor) ^ opts.slowdown_ramp_exponent))
 735 |             end
 736 |             if next_delay_pts or s <= opts.speed_max or new_speed ~= opts.speed_max then
 737 |                 new_speed = math.min(s, opts.speed_max)
 738 |                 last_speed_change_time = now
 739 |                 if next_delay_pts or new_speed ~= opts.speed_max then
 740 |                     next_delay = take_lower(next_delay, opts.speed_updateinterval)
 741 |                 end
 742 |             end
 743 |         end
 744 |     end
 745 |     if new_speed ~= prev_speed then
 746 |         expected_speed = new_speed
 747 |         mp.set_property_number("speed", new_speed)
 748 |     end
 749 |     if next_delay_pts then
 750 |         next_delay = take_lower(next_delay, next_delay_pts / new_speed)
 751 |     end
 752 |     if next_delay then
 753 |         schedule_check_time(next_delay)
 754 |     end
 755 |     dprint("check_time: new_speed:", new_speed, "is_silent:", is_silent, "next_delay:", next_delay, "next_delay_pts:", next_delay_pts)
 756 | end
 757 | 
 758 | function schedule_check_time(time)
 759 |     -- no scheduling while paused; will check on resume
 760 |     if is_paused then return end
 761 |     if check_time_timer == nil then
 762 |         check_time_timer = mp.add_timeout(time, check_time)
 763 |     else
 764 |         check_time_timer:kill()
 765 |         check_time_timer.timeout = time
 766 |         check_time_timer:resume()
 767 |     end
 768 | end
 769 | 
 770 | local function handle_pause(name, paused)
 771 |     dprint("handle_pause", name, paused)
 772 |     is_paused = paused
 773 |     local now = mp.get_time()
 774 |     if input_ref_pts then
 775 |         if paused then
 776 |             if not input_ref_pause_time then
 777 |                 input_ref_pause_time = now
 778 |             end
 779 |         elseif input_ref_pause_time then
 780 |             local delta = now - input_ref_pause_time
 781 |             input_ref_time = input_ref_time + delta
 782 |             input_ref_pause_time = nil
 783 |         end
 784 |     end
 785 | 
 786 |     if filter_lookahead > 0 and not paused and filter_restarted then
 787 |         filter_restarted = false
 788 |         estimate_input_time(now)
 789 |     end
 790 | 
 791 |     stats_handle_pause(now, paused)
 792 |     if is_enabled then
 793 |         if paused then
 794 |             if check_time_timer then
 795 |                 check_time_timer:kill()
 796 |             end
 797 |         else
 798 |             check_time()
 799 |         end
 800 |         schedule_update_info(now)
 801 |     end
 802 | end
 803 | 
 804 | local function handle_speed(_, speed)
 805 |     dprint("handle_speed", speed)
 806 |     local time = nil
 807 |     if input_ref_pts ~= nil then
 808 |         time = mp.get_time()
 809 |         input_ref_pts = get_input_pts(time)
 810 |         input_ref_time = input_ref_pause_time or time
 811 |     end
 812 |     latest_speed = speed
 813 |     if is_silent then
 814 |         time = time or mp.get_time()
 815 |         stats_accumulate(time, speed)
 816 |     end
 817 | 
 818 |     if is_enabled and math.abs(speed - expected_speed) > 0.01 then
 819 |         local do_check = false
 820 |         dprint("handle_speed: external speed change: got", speed, "instead of", expected_speed)
 821 |         if is_silent then
 822 |             if opts.apply_speed_change == "add" then
 823 |                 set_base_speed(base_speed + speed - expected_speed)
 824 |                 do_check = true
 825 |             elseif opts.apply_speed_change == "multiply" then
 826 |                 set_base_speed(base_speed * speed / expected_speed)
 827 |                 do_check = true
 828 |             end
 829 |         else
 830 |             set_base_speed(speed)
 831 |         end
 832 |         expected_speed = speed
 833 |         if do_check then
 834 |             last_speed_change_time = -1
 835 |             check_time()
 836 |         end
 837 |     end
 838 | end
 839 | 
 840 | local function add_event(silent, pts)
 841 |     local prev = events[events_ilast]
 842 | 
 843 |     -- After reapply_filter, events can arrive late from the removed filter.
 844 |     -- Workaround: remove all events when there is a jump back.
 845 |     if prev and prev.pts > pts then
 846 |         clear_events()
 847 |         prev = nil
 848 |     end
 849 | 
 850 |     if not prev or silent ~= prev.is_silent then
 851 |         local time = mp.get_time()
 852 |         if not filter_restart_time_pos or pts >= filter_restart_time_pos then
 853 |             if silent then
 854 |                 -- start message reports start of silence, so current pts is
 855 |                 -- after threshold duration
 856 |                 input_ref_pts = pts + filter_threshold_duration
 857 |             else
 858 |                 input_ref_pts = pts
 859 |             end
 860 |             input_ref_time = time
 861 |             if is_paused then
 862 |                 input_ref_pause_time = time
 863 |             end
 864 |         end
 865 | 
 866 |         if filter_lookahead and not silent and prev and not prev.current then
 867 |             if pts - prev.pts < opts.minduration then
 868 |                 -- ignore too short silence
 869 |                 drop_last_event()
 870 |                 return
 871 |             end
 872 |         end
 873 | 
 874 |         local i = events_ilast + 1
 875 |         events[i] = {
 876 |             recv_time = time,
 877 |             is_silent = silent,
 878 |             filter_cleanup_time = filter_reapply_time,
 879 |             pts = pts,
 880 |         }
 881 |         events_ilast = i
 882 |         if not is_paused and is_enabled then
 883 |             check_time()
 884 |         end
 885 |     end
 886 |     if not is_enabled then
 887 |         -- remove outdated events: keep the newest event in the past relative
 888 |         -- to input time
 889 |         local input_pts = pts
 890 |         if filter_lookahead > 0 then
 891 |             input_pts = input_pts - filter_lookahead
 892 |         end
 893 |         for i = events_ifirst+1, events_ilast-1 do
 894 |             if events[i].pts > input_pts then
 895 |                 drop_event()
 896 |             end
 897 |         end
 898 |     end
 899 | end
 900 | 
 901 | -- example messages:
 902 | --
 903 | --     [ffmpeg] silencedetect@filterId: silence_start: 6.07669
 904 | --     [ffmpeg] silencedetect@filterId: silence_end: 7.06427 | silence_duration: 0.987583
 905 | --
 906 | -- before ffmpeg 8.1: no @filterId
 907 | 
 908 | -- ffmpeg 8.1 and newer
 909 | local msg_pattern_with_id = "^silencedetect@"..detect_filter_ffmpeg_id..": silence_(%a+): ([0-9%.]+)"
 910 | -- ffmpeg 8.0 and older
 911 | local msg_pattern_no_id = "^silencedetect: silence_(%a+): ([0-9%.]+)"
 912 | 
 913 | local function handle_silence_msg(msg)
 914 |     if msg.prefix ~= "ffmpeg" then return end
 915 |     -- find without pattern is significantly faster; jump out fast
 916 |     if msg.text:find("silencedetect", 1, true) ~= 1 then return end
 917 | 
 918 |     local pattern = msg_pattern_no_id
 919 |     -- Check presence of @filterId in silencedetect@filterId by
 920 |     -- index to avoid multiple match calls.
 921 |     if msg.text:sub(14, 14) == "@" then
 922 |         pattern = msg_pattern_with_id
 923 |     end
 924 | 
 925 |     local startend, pts = msg.text:match(pattern)
 926 |     pts = tonumber(pts)
 927 | 
 928 |     if startend == "start" and pts then
 929 |         filter_reapply_time = -1
 930 |         dprint("got silence start message", pts)
 931 |         add_event(true, pts)
 932 |     elseif startend == "end" and pts then
 933 |         dprint("got silence end message", pts)
 934 |         add_event(false, pts)
 935 |     else
 936 |         dprint("invalid match:", msg.text)
 937 |     end
 938 | end
 939 | 
 940 | local function set_option(opt_name, value)
 941 |     mp.commandv("change-list", "script-opts", "append",
 942 |         mp.get_script_name().."-"..opt_name.."="..value)
 943 | end
 944 | 
 945 | local function adjust_thresholdDB(change)
 946 |     local value = opts.threshold_db + change
 947 |     set_option("threshold_db", tostring(value))
 948 |     mp.osd_message("silence threshold: "..value.."dB")
 949 | end
 950 | 
 951 | local function adjust_speed(method, number_str)
 952 |     local number = tonumber(number_str)
 953 |     if method ~= "add" and method ~= "multiply" and method ~= "set" or not number then
 954 |         mp.msg.error("invalid arguments; usage: adjust-speed add|multiply|set <number>")
 955 |         return
 956 |     end
 957 | 
 958 |     if is_silent then
 959 |         if method == "add" then
 960 |             set_base_speed(base_speed + number)
 961 |         elseif method == "multiply" then
 962 |             set_base_speed(base_speed * number)
 963 |         elseif method == "set" then
 964 |             set_base_speed(number)
 965 |         end
 966 |         last_speed_change_time = -1
 967 |         check_time()
 968 |     end
 969 | end
 970 | 
 971 | local function toggle_option(opt_name)
 972 |     local value = not opts[opt_name]
 973 |     local str = value and "yes" or "no"
 974 |     set_option(opt_name, str)
 975 |     mp.osd_message(mp.get_script_name().."-"..opt_name..": "..str)
 976 | end
 977 | 
 978 | local function cycle_info_style(style)
 979 |     local value = style or (
 980 |         opts.infostyle == "total" and "compact" or (
 981 |         opts.infostyle == "compact" and "verbose" or (
 982 |         opts.infostyle == "verbose" and "off" or "total")))
 983 |     set_option("infostyle", value)
 984 |     mp.osd_message(mp.get_script_name().."-infostyle: "..value)
 985 | end
 986 | 
 987 | -- called regardless of enabled state
 988 | local function handle_start_file()
 989 |     dprint("handle_start_file")
 990 |     clear_silence_state()
 991 |     filter_restarted = true
 992 |     filter_restart_time_pos = nil
 993 |     stats_clear()
 994 |     if opts.reset_total == "file-start" then
 995 |         total_saved_time = 0
 996 |     end
 997 |     update_info_now()
 998 | end
 999 | 
1000 | -- events on seek:
1001 | -- 1. seek event
1002 | -- 2. core-idle=true
1003 | -- 3. seeking=true
1004 | -- 4. (if target is silent) silence start msg
1005 | -- 5. playback-restart event
1006 | -- 6. core-idle=false
1007 | -- 7. seeking=false
1008 | local function handle_seek()
1009 |     dprint("handle_seek")
1010 |     clear_silence_state()
1011 |     filter_restarted = true
1012 |     filter_restart_time_pos = nil
1013 | end
1014 | 
1015 | local function insert_detect_filter()
1016 |     if not is_filter_added then
1017 |         -- if filter was added externally, silence start messages are
1018 |         -- missed; ensure it's removed first
1019 |         if mp.get_property("af"):find("@"..detect_filter_label..":[^!]") then
1020 |             -- replace with disabled anull to preserve filter position
1021 |             mp.commandv("af", "pre", "@"..detect_filter_label..":!anull")
1022 |         end
1023 |     end
1024 |     mp.commandv("af", "pre", get_silence_filter())
1025 | 
1026 |     if not mp.get_property("af"):find("@"..detect_filter_label..":", 1, true) then
1027 |         return false
1028 |     end
1029 |     update_filter_opts()
1030 | 
1031 |     if not is_filter_added then
1032 |         mp.register_event("seek", handle_seek)
1033 |         mp.register_event("log-message", handle_silence_msg)
1034 |         mp.observe_property("speed", "number", handle_speed)
1035 |         mp.observe_property("core-idle", "bool", handle_pause)
1036 |     end
1037 |     is_filter_added = true
1038 |     estimate_input_time(mp.get_time())
1039 |     return true
1040 | end
1041 | 
1042 | local function remove_detect_filter()
1043 |     if reapply_filter_timer then
1044 |         reapply_filter_timer:kill()
1045 |     end
1046 |     mp.unregister_event(handle_seek)
1047 |     mp.unregister_event(handle_silence_msg)
1048 |     mp.unobserve_property(handle_speed)
1049 |     mp.unobserve_property(handle_pause)
1050 |     -- replace with disabled anull to preserve filter position
1051 |     mp.commandv("af", "pre", "@"..detect_filter_label..":!anull")
1052 |     is_filter_added = false
1053 |     clear_events()
1054 | end
1055 | 
1056 | local function enable(flag)
1057 |     local no_osd = flag == "no-osd"
1058 | 
1059 |     if not is_enabled then
1060 |         if not insert_detect_filter() then
1061 |             if opts.enabled then set_option("enabled", "no") end
1062 |             mp.osd_message("skipsilence enable failed: see console output")
1063 |             return
1064 |         end
1065 |         is_enabled = true
1066 |         if not no_osd then
1067 |             mp.osd_message("skipsilence enabled")
1068 |         end
1069 |         set_base_speed(mp.get_property_number("speed"))
1070 | 
1071 |         check_time()
1072 |     end
1073 | 
1074 |     set_option("enabled", "yes")
1075 |     mp.set_property_bool("user-data/skipsilence/enabled", true)
1076 | end
1077 | 
1078 | local function disable(arg1, arg2)
1079 |     local no_osd = false
1080 |     local opt_base_speed = nil
1081 |     if arg1 == "no-osd" then
1082 |         no_osd = true
1083 |     else
1084 |         opt_base_speed = tonumber(arg1)
1085 |         if not opt_base_speed and arg1 then
1086 |             mp.msg.warn("invalid number:", arg1)
1087 |         end
1088 |         if arg2 == "no-osd" then
1089 |             no_osd = true
1090 |         end
1091 |     end
1092 | 
1093 |     if check_time_timer then
1094 |         check_time_timer:kill()
1095 |     end
1096 | 
1097 |     if is_enabled then
1098 |         if not opts.filter_persistent then
1099 |             remove_detect_filter()
1100 |         end
1101 | 
1102 |         if opt_base_speed then
1103 |             mp.set_property_number("speed", opt_base_speed)
1104 |         else
1105 |             local speed = is_silent and base_speed or mp.get_property_number("speed")
1106 |             if opts.alt_normal_speed and math.abs(speed - opts.alt_normal_speed) < 0.001 then
1107 |                 mp.set_property_number("speed", 1)
1108 |             elseif is_silent then
1109 |                 mp.set_property_number("speed", speed)
1110 |             end
1111 |         end
1112 | 
1113 |         if is_silent then
1114 |             stats_end_current(mp.get_time())
1115 |         end
1116 |         is_silent = false
1117 |         is_enabled = false
1118 |         schedule_update_info()
1119 |         if not no_osd then
1120 |             mp.osd_message("skipsilence disabled")
1121 |         end
1122 | 
1123 |         if opts.resync_threshold_droppedframes >= 0 then
1124 |             local drops = mp.get_property_number("frame-drop-count")
1125 |             if drops and drops >= opts.resync_threshold_droppedframes then
1126 |                 mp.commandv("seek", "0", "exact")
1127 |             end
1128 |         end
1129 |     end
1130 | 
1131 |     if opts.enabled then set_option("enabled", "no") end
1132 |     mp.set_property_bool("user-data/skipsilence/enabled", false)
1133 | end
1134 | 
1135 | local function toggle(flag)
1136 |     local arg
1137 |     if flag == "no-osd" then
1138 |         arg = "no-osd"
1139 |     end
1140 |     if is_enabled then
1141 |         disable(arg)
1142 |     else
1143 |         enable(arg)
1144 |     end
1145 | end
1146 | 
1147 | local function info(style)
1148 |     mp.osd_message(format_info(
1149 |         style or opts.infostyle,
1150 |         get_current_stats(mp.get_time())))
1151 | end
1152 | 
1153 | local function reset_total_saved_time()
1154 |     total_saved_time = 0
1155 |     update_info_now()
1156 | end
1157 | 
1158 | (require "mp.options").read_options(opts, nil, function(list)
1159 |     if list["enabled"] and not opts.enabled and is_enabled then
1160 |         disable("no-osd")
1161 |     end
1162 |     if list["threshold_db"] or list["threshold_duration"] or list["lookahead"]
1163 |         or list["arnndn_enable"] or list["arnndn_modelpath"]
1164 |         or list["arnndn_output"] then
1165 |         if is_filter_added then
1166 |             reapply_filter()
1167 |         else
1168 |             update_filter_opts()
1169 |         end
1170 |     end
1171 |     if list["ramp_constant"] or list["ramp_factor"] or list["ramp_exponent"]
1172 |         or list["slowdown_ramp_constant"] or list["slowdown_ramp_factor"]
1173 |         or list["slowdown_ramp_exponent"] or list["minduration"]
1174 |         or list["startdelay"] or list["margin_start"] or list["margin_end"]
1175 |         or list["speed_updateinterval"] or list["speed_max"] then
1176 |         if is_enabled then
1177 |             check_time()
1178 |         end
1179 |         update_info_now()
1180 |     elseif list["infostyle"] then
1181 |         update_info_now()
1182 |     end
1183 |     if list["filter_persistent"] then
1184 |         if not opts.filter_persistent and not is_enabled and is_filter_added then
1185 |             remove_detect_filter()
1186 |         end
1187 |     end
1188 |     if list["enabled"] and opts.enabled and not is_enabled then
1189 |         enable("no-osd")
1190 |     end
1191 | end)
1192 | 
1193 | mp.enable_messages("v")
1194 | mp.add_key_binding(nil, "enable", enable)
1195 | mp.add_key_binding(nil, "disable", disable)
1196 | mp.add_key_binding("F2", "toggle", toggle)
1197 | mp.register_script_message("adjust-threshold-db", adjust_thresholdDB)
1198 | mp.add_key_binding("F3", "threshold-down", function() adjust_thresholdDB(-1) end, "repeatable")
1199 | mp.add_key_binding("F4", "threshold-up", function() adjust_thresholdDB(1) end, "repeatable")
1200 | mp.register_script_message("adjust-speed", adjust_speed, "repeatable")
1201 | mp.add_key_binding(nil, "info", info, "repeatable")
1202 | mp.add_key_binding(nil, "cycle-info-style", cycle_info_style)
1203 | mp.add_key_binding(nil, "reset-total", reset_total_saved_time)
1204 | mp.add_key_binding(nil, "toggle-arnndn", function() toggle_option("arnndn_enable") end)
1205 | mp.add_key_binding(nil, "toggle-arnndn-output", function() toggle_option("arnndn_output") end)
1206 | mp.register_event("start-file", handle_start_file)
1207 | 
1208 | set_base_speed(1)
1209 | 
1210 | update_filter_opts()
1211 | update_info_now()
1212 | if opts.enabled then
1213 |     enable("no-osd")
1214 | end
1215 | 
1216 | -- vim:set sw=4 sts=0 et tw=0:
1217 | 


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