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mpv/player/core.h
wm4 b9d351f02a Implement backwards playback 
See manpage additions. This is a huge hack. You can bet there are shit
tons of bugs. It's literally forcing square pegs into round holes.
Hopefully, the manpage wall of text makes it clear enough that the whole
shit can easily crash and burn. (Although it shouldn't literally crash.
That would be a bug. It possibly _could_ start a fire by entering some
sort of endless loop, not a literal one, just something where it tries
to do work without making progress.)

(Some obvious bugs I simply ignored for this initial version, but
there's a number of potential bugs I can't even imagine. Normal playback
should remain completely unaffected, though.)

How this works is also described in the manpage. Basically, we demux in
reverse, then we decode in reverse, then we render in reverse.

The decoding part is the simplest: just reorder the decoder output. This
weirdly integrates with the timeline/ordered chapter code, which also
has special requirements on feeding the packets to the decoder in a
non-straightforward way (it doesn't conflict, although a bugmessmass
breaks correct slicing of segments, so EDL/ordered chapter playback is
broken in backward direction).

Backward demuxing is pretty involved. In theory, it could be much
easier: simply iterating the usual demuxer output backward. But this
just doesn't fit into our code, so there's a cthulhu nightmare of shit.
To be specific, each stream (audio, video) is reversed separately. At
least this means we can do backward playback within cached content (for
example, you could play backwards in a live stream; on that note, it
disables prefetching, which would lead to losing new live video, but
this could be avoided).

The fuckmess also meant that I didn't bother trying to support
subtitles. Subtitles are a problem because they're "sparse" streams.
They need to be "passively" demuxed: you don't try to read a subtitle
packet, you demux audio and video, and then look whether there was a
subtitle packet. This means to get subtitles for a time range, you need
to know that you demuxed video and audio over this range, which becomes
pretty messy when you demux audio and video backwards separately.

Backward display is the most weird (and potentially buggy) part. To
avoid that we need to touch a LOT of timing code, we negate all
timestamps. The basic idea is that due to the navigation, all
comparisons and subtractions of timestamps keep working, and you don't
need to touch every single of them to "reverse" them.

E.g.:

    bool before = pts_a < pts_b;

would need to be:

    bool before = forward
        ? pts_a < pts_b
        : pts_a > pts_b;

or:

    bool before = pts_a * dir < pts_b * dir;

or if you, as it's implemented now, just do this after decoding:

    pts_a *= dir;
    pts_b *= dir;

and then in the normal timing/renderer code:

    bool before = pts_a < pts_b;

Consequently, we don't need many changes in the latter code. But some
assumptions inhererently true for forward playback may have been broken
anyway. What is mainly needed is fixing places where values are passed
between positive and negative "domains". For example, seeking and
timestamp user display always uses positive timestamps. The main mess is
that it's not obvious which domain a given variable should or does use.

Well, in my tests with a single file, it suddenly started to work when I
did this. I'm honestly surprised that it did, and that I didn't have to
change a single line in the timing code past decoder (just something
minor to make external/cached text subtitles display). I committed it
immediately while avoiding thinking about it. But there really likely
are subtle problems of all sorts.

As far as I'm aware, gstreamer also supports backward playback. When I
looked at this years ago, I couldn't find a way to actually try this,
and I didn't revisit it now. Back then I also read talk slides from the
person who implemented it, and I'm not sure if and which ideas I might
have taken from it. It's possible that the timestamp reversal is
inspired by it, but I didn't check. (I think it claimed that it could
avoid large changes by changing a sign?)

VapourSynth has some sort of reverse function, which provides a backward
view on a video. The function itself is trivial to implement, as
VapourSynth aims to provide random access to video by frame numbers (so
you just request decreasing frame numbers). From what I remember, it
wasn't exactly fluid, but it worked. It's implemented by creating an
index, and seeking to the target on demand, and a bunch of caching. mpv
could use it, but it would either require using VapourSynth as demuxer
and decoder for everything, or replacing the current file every time
something is supposed to be played backwards.

FFmpeg's libavfilter has reversal filters for audio and video. These
require buffering the entire media data of the file, and don't really
fit into mpv's architecture. It could be used by playing a libavfilter
graph that also demuxes, but that's like VapourSynth but worse.
2019-09-19 20:37:04 +02:00

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/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* mpv is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef MPLAYER_MP_CORE_H
#define MPLAYER_MP_CORE_H
#include <stdbool.h>
#include <pthread.h>
#include "osdep/atomic.h"
#include "libmpv/client.h"
#include "common/common.h"
#include "filters/filter.h"
#include "filters/f_output_chain.h"
#include "options/options.h"
#include "sub/osd.h"
#include "audio/aframe.h"
#include "video/mp_image.h"
#include "video/out/vo.h"
// definitions used internally by the core player code
enum stop_play_reason {
KEEP_PLAYING = 0, // playback of a file is actually going on
// must be 0, numeric values of others do not matter
AT_END_OF_FILE, // file has ended, prepare to play next
// also returned on unrecoverable playback errors
PT_NEXT_ENTRY, // prepare to play next entry in playlist
PT_CURRENT_ENTRY, // prepare to play mpctx->playlist->current
PT_STOP, // stop playback, or transient state when going to next
PT_QUIT, // stop playback, quit player
PT_ERROR, // play next playlist entry (due to an error)
};
enum mp_osd_seek_info {
OSD_SEEK_INFO_BAR = 1,
OSD_SEEK_INFO_TEXT = 2,
OSD_SEEK_INFO_CHAPTER_TEXT = 4,
OSD_SEEK_INFO_CURRENT_FILE = 8,
};
enum {
// other constants
OSD_LEVEL_INVISIBLE = 4,
OSD_BAR_SEEK = 256,
MAX_NUM_VO_PTS = 100,
};
enum seek_type {
MPSEEK_NONE = 0,
MPSEEK_RELATIVE,
MPSEEK_ABSOLUTE,
MPSEEK_FACTOR,
MPSEEK_BACKSTEP,
};
enum seek_precision {
// The following values are numerically sorted by increasing precision
MPSEEK_DEFAULT = 0,
MPSEEK_KEYFRAME,
MPSEEK_EXACT,
MPSEEK_VERY_EXACT,
};
enum seek_flags {
MPSEEK_FLAG_DELAY = 1 << 0, // give player chance to coalesce multiple seeks
MPSEEK_FLAG_NOFLUSH = 1 << 1, // keeping remaining data for seamless loops
};
struct seek_params {
enum seek_type type;
enum seek_precision exact;
double amount;
unsigned flags; // MPSEEK_FLAG_*
};
enum video_sync {
VS_DEFAULT = 0,
VS_DISP_RESAMPLE,
VS_DISP_RESAMPLE_VDROP,
VS_DISP_RESAMPLE_NONE,
VS_DISP_ADROP,
VS_DISP_VDROP,
VS_DISP_NONE,
VS_NONE,
};
#define VS_IS_DISP(x) ((x) == VS_DISP_RESAMPLE || \
(x) == VS_DISP_RESAMPLE_VDROP || \
(x) == VS_DISP_RESAMPLE_NONE || \
(x) == VS_DISP_ADROP || \
(x) == VS_DISP_VDROP || \
(x) == VS_DISP_NONE)
// Information about past video frames that have been sent to the VO.
struct frame_info {
double pts;
double duration; // PTS difference to next frame
double approx_duration; // possibly fixed/smoothed out duration
double av_diff; // A/V diff at time of scheduling
int num_vsyncs; // scheduled vsyncs, if using display-sync
};
struct track {
enum stream_type type;
// Currently used for decoding.
bool selected;
// The type specific ID, also called aid (audio), sid (subs), vid (video).
// For UI purposes only; this ID doesn't have anything to do with any
// IDs coming from demuxers or container files.
int user_tid;
int demuxer_id; // same as stream->demuxer_id. -1 if not set.
int ff_index; // same as stream->ff_index, or 0.
char *title;
bool default_track, forced_track, dependent_track;
bool visual_impaired_track, hearing_impaired_track;
bool attached_picture;
char *lang;
// If this track is from an external file (e.g. subtitle file).
bool is_external;
bool no_default; // pretend it's not external for auto-selection
bool no_auto_select;
char *external_filename;
bool auto_loaded;
struct demuxer *demuxer;
// Invariant: !stream || stream->demuxer == demuxer
struct sh_stream *stream;
// Current subtitle state (or cached state if selected==false).
struct dec_sub *d_sub;
// Current decoding state (NULL if selected==false)
struct mp_decoder_wrapper *dec;
// Where the decoded result goes to (one of them is not NULL if active)
struct vo_chain *vo_c;
struct ao_chain *ao_c;
struct mp_pin *sink;
// For stream recording (remuxing mode).
struct mp_recorder_sink *remux_sink;
};
// Summarizes video filtering and output.
struct vo_chain {
struct mp_log *log;
struct mp_output_chain *filter;
//struct vf_chain *vf;
struct vo *vo;
struct track *track;
struct mp_pin *filter_src;
struct mp_pin *dec_src;
// - video consists of a single picture, which should be shown only once
// - do not sync audio to video in any way
bool is_coverart;
// - video consists of sparse still images
bool is_sparse;
};
// Like vo_chain, for audio.
struct ao_chain {
struct mp_log *log;
bool spdif_passthrough, spdif_failed;
struct mp_output_chain *filter;
struct ao *ao;
struct mp_audio_buffer *ao_buffer;
double ao_resume_time;
// 1-element output frame queue.
struct mp_aframe *output_frame;
bool out_eof;
double last_out_pts;
struct track *track;
struct mp_pin *filter_src;
struct mp_pin *dec_src;
};
/* Note that playback can be paused, stopped, etc. at any time. While paused,
* playback restart is still active, because you want seeking to work even
* if paused.
* The main purpose of distinguishing these states is proper reinitialization
* of A/V sync.
*/
enum playback_status {
// code may compare status values numerically
STATUS_SYNCING, // seeking for a position to resume
STATUS_FILLING, // decoding more data (so you start with full buffers)
STATUS_READY, // buffers full, playback can be started any time
STATUS_PLAYING, // normal playback
STATUS_DRAINING, // decoding has ended; still playing out queued buffers
STATUS_EOF, // playback has ended, or is disabled
};
#define NUM_PTRACKS 2
typedef struct MPContext {
bool initialized;
bool is_cli;
struct mpv_global *global;
struct MPOpts *opts;
struct mp_log *log;
struct m_config *mconfig;
struct input_ctx *input;
struct mp_client_api *clients;
struct mp_dispatch_queue *dispatch;
struct mp_cancel *playback_abort;
// Number of asynchronous tasks that still need to finish until MPContext
// destruction is ok. It's implied that the async tasks call
// mp_wakeup_core() each time this is decremented.
// As using an atomic+wakeup would be racy, this is a normal integer, and
// mp_dispatch_lock must be called to change it.
int64_t outstanding_async;
struct mp_thread_pool *thread_pool; // for coarse I/O, often during loading
struct mp_log *statusline;
struct osd_state *osd;
char *term_osd_text;
char *term_osd_status;
char *term_osd_subs;
char *term_osd_contents;
char *last_window_title;
struct voctrl_playback_state vo_playback_state;
int add_osd_seek_info; // bitfield of enum mp_osd_seek_info
double osd_visible; // for the osd bar only
int osd_function;
double osd_function_visible;
double osd_msg_visible;
double osd_msg_next_duration;
double osd_last_update;
bool osd_force_update, osd_idle_update;
char *osd_msg_text;
bool osd_show_pos;
struct osd_progbar_state osd_progbar;
struct playlist *playlist;
struct playlist_entry *playing; // currently playing file
char *filename; // immutable copy of playing->filename (or NULL)
char *stream_open_filename;
enum stop_play_reason stop_play;
bool playback_initialized; // playloop can be run/is running
int error_playing;
// Return code to use with PT_QUIT
int quit_custom_rc;
bool has_quit_custom_rc;
char **resume_defaults;
// Global file statistics
int files_played; // played without issues (even if stopped by user)
int files_errored; // played, but errors happened at one point
int files_broken; // couldn't be played at all
// Current file statistics
int64_t shown_vframes, shown_aframes;
struct demux_chapter *chapters;
int num_chapters;
struct demuxer *demuxer;
struct mp_tags *filtered_tags;
struct track **tracks;
int num_tracks;
int64_t death_hack; // don't fucking ask, just don't
char *track_layout_hash;
// Selected tracks. NULL if no track selected.
// There can be NUM_PTRACKS of the same STREAM_TYPE selected at once.
// Currently, this is used for the secondary subtitle track only.
struct track *current_track[NUM_PTRACKS][STREAM_TYPE_COUNT];
struct mp_filter *filter_root;
struct mp_filter *lavfi;
char *lavfi_graph;
struct ao *ao;
struct mp_aframe *ao_filter_fmt; // for weak gapless audio check
struct ao_chain *ao_chain;
struct vo_chain *vo_chain;
struct vo *video_out;
// next_frame[0] is the next frame, next_frame[1] the one after that.
// The +1 is for adding 1 additional frame in backstep mode.
struct mp_image *next_frames[VO_MAX_REQ_FRAMES + 1];
int num_next_frames;
struct mp_image *saved_frame; // for hrseek_lastframe and hrseek_backstep
enum playback_status video_status, audio_status;
bool restart_complete;
int play_dir;
// Factors to multiply with opts->playback_speed to get the total audio or
// video speed (usually 1.0, but can be set to by the sync code).
double speed_factor_v, speed_factor_a;
// Redundant values set from opts->playback_speed and speed_factor_*.
// update_playback_speed() updates them from the other fields.
double audio_speed, video_speed;
bool display_sync_active;
bool display_sync_broken;
int display_sync_drift_dir;
// Timing error (in seconds) due to rounding on vsync boundaries
double display_sync_error;
double audio_drop_throttle;
// Number of mistimed frames.
int mistimed_frames_total;
bool hrseek_active; // skip all data until hrseek_pts
bool hrseek_lastframe; // drop everything until last frame reached
bool hrseek_backstep; // go to frame before seek target
double hrseek_pts;
struct seek_params current_seek;
bool ab_loop_clip; // clip to the "b" part of an A-B loop if available
// AV sync: the next frame should be shown when the audio out has this
// much (in seconds) buffered data left. Increased when more data is
// written to the ao, decreased when moving to the next video frame.
double delay;
// AV sync: time in seconds until next frame should be shown
double time_frame;
// How much video timing has been changed to make it match the audio
// timeline. Used for status line information only.
double total_avsync_change;
// A-V sync difference when last frame was displayed. Kept to display
// the same value if the status line is updated at a time where no new
// video frame is shown.
double last_av_difference;
/* timestamp of video frame currently visible on screen
* (or at least queued to be flipped by VO) */
double video_pts;
double last_seek_pts;
// As video_pts, but is not reset when seeking away. (For the very short
// period of time until a new frame is decoded and shown.)
double last_vo_pts;
// Frame duration field from demuxer. Only used for duration of the last
// video frame.
double last_frame_duration;
// Video PTS, or audio PTS if video has ended.
double playback_pts;
// audio stats only
int64_t audio_stat_start;
double written_audio;
int last_chapter;
// Past timestamps etc.
// The newest frame is at index 0.
struct frame_info *past_frames;
int num_past_frames;
double last_idle_tick;
double next_cache_update;
double sleeptime; // number of seconds to sleep before next iteration
double mouse_timer;
unsigned int mouse_event_ts;
bool mouse_cursor_visible;
// used to prevent hanging in some error cases
double start_timestamp;
// Timestamp from the last time some timing functions read the
// current time, in microseconds.
// Used to turn a new time value to a delta from last time.
int64_t last_time;
struct seek_params seek;
// Can be temporarily set to an external audio track after seeks. Then it
// must be seeked to the video position once video is done seeking.
struct track *seek_slave;
/* Heuristic for relative chapter seeks: keep track which chapter
* the user wanted to go to, even if we aren't exactly within the
* boundaries of that chapter due to an inaccurate seek. */
int last_chapter_seek;
double last_chapter_pts;
bool paused; // internal pause state
bool playback_active; // not paused, restarting, loading, unloading
bool in_playloop;
// step this many frames, then pause
int step_frames;
// Counted down each frame, stop playback if 0 is reached. (-1 = disable)
int max_frames;
bool playing_msg_shown;
bool paused_for_cache;
double cache_stop_time;
int cache_buffer;
// Set after showing warning about decoding being too slow for realtime
// playback rate. Used to avoid showing it multiple times.
bool drop_message_shown;
struct mp_recorder *recorder;
char *cached_watch_later_configdir;
struct screenshot_ctx *screenshot_ctx;
struct command_ctx *command_ctx;
struct encode_lavc_context *encode_lavc_ctx;
struct mp_ipc_ctx *ipc_ctx;
pthread_mutex_t abort_lock;
// --- The following fields are protected by abort_lock
struct mp_abort_entry **abort_list;
int num_abort_list;
bool abort_all; // during final termination
// --- Owned by MPContext
pthread_t open_thread;
bool open_active; // open_thread is a valid thread handle, all setup
atomic_bool open_done;
// --- All fields below are immutable while open_active is true.
// Otherwise, they're owned by MPContext.
struct mp_cancel *open_cancel;
char *open_url;
char *open_format;
int open_url_flags;
// --- All fields below are owned by open_thread, unless open_done was set
// to true.
struct demuxer *open_res_demuxer;
int open_res_error;
} MPContext;
// Contains information about an asynchronous work item, how it can be aborted,
// and when. All fields are protected by MPContext.abort_lock.
struct mp_abort_entry {
// General conditions.
bool coupled_to_playback; // trigger when playback is terminated
// Actual trigger to abort the work.
struct mp_cancel *cancel;
// For client API.
struct mpv_handle *client; // non-NULL if done by a client API user
int client_work_type; // client API type, e.h. MPV_EVENT_COMMAND_REPLY
uint64_t client_work_id; // client API user reply_userdata value
// (only valid if client_work_type set)
};
// audio.c
void reset_audio_state(struct MPContext *mpctx);
void reinit_audio_chain(struct MPContext *mpctx);
int init_audio_decoder(struct MPContext *mpctx, struct track *track);
int reinit_audio_filters(struct MPContext *mpctx);
double playing_audio_pts(struct MPContext *mpctx);
void fill_audio_out_buffers(struct MPContext *mpctx);
double written_audio_pts(struct MPContext *mpctx);
void clear_audio_output_buffers(struct MPContext *mpctx);
void update_playback_speed(struct MPContext *mpctx);
void uninit_audio_out(struct MPContext *mpctx);
void uninit_audio_chain(struct MPContext *mpctx);
int init_audio_decoder(struct MPContext *mpctx, struct track *track);
void reinit_audio_chain_src(struct MPContext *mpctx, struct track *track);
void audio_update_volume(struct MPContext *mpctx);
void audio_update_balance(struct MPContext *mpctx);
void reload_audio_output(struct MPContext *mpctx);
// configfiles.c
void mp_parse_cfgfiles(struct MPContext *mpctx);
void mp_load_auto_profiles(struct MPContext *mpctx);
void mp_get_resume_defaults(struct MPContext *mpctx);
void mp_load_playback_resume(struct MPContext *mpctx, const char *file);
void mp_write_watch_later_conf(struct MPContext *mpctx);
struct playlist_entry *mp_check_playlist_resume(struct MPContext *mpctx,
struct playlist *playlist);
// loadfile.c
void mp_abort_playback_async(struct MPContext *mpctx);
void mp_abort_add(struct MPContext *mpctx, struct mp_abort_entry *abort);
void mp_abort_remove(struct MPContext *mpctx, struct mp_abort_entry *abort);
void mp_abort_recheck_locked(struct MPContext *mpctx,
struct mp_abort_entry *abort);
void mp_abort_trigger_locked(struct MPContext *mpctx,
struct mp_abort_entry *abort);
void uninit_player(struct MPContext *mpctx, unsigned int mask);
int mp_add_external_file(struct MPContext *mpctx, char *filename,
enum stream_type filter, struct mp_cancel *cancel);
#define FLAG_MARK_SELECTION 1
void mp_switch_track(struct MPContext *mpctx, enum stream_type type,
struct track *track, int flags);
void mp_switch_track_n(struct MPContext *mpctx, int order,
enum stream_type type, struct track *track, int flags);
void mp_deselect_track(struct MPContext *mpctx, struct track *track);
struct track *mp_track_by_tid(struct MPContext *mpctx, enum stream_type type,
int tid);
void add_demuxer_tracks(struct MPContext *mpctx, struct demuxer *demuxer);
bool mp_remove_track(struct MPContext *mpctx, struct track *track);
struct playlist_entry *mp_next_file(struct MPContext *mpctx, int direction,
bool force, bool mutate);
void mp_set_playlist_entry(struct MPContext *mpctx, struct playlist_entry *e);
void mp_play_files(struct MPContext *mpctx);
void update_demuxer_properties(struct MPContext *mpctx);
void print_track_list(struct MPContext *mpctx, const char *msg);
void reselect_demux_stream(struct MPContext *mpctx, struct track *track);
void prepare_playlist(struct MPContext *mpctx, struct playlist *pl);
void autoload_external_files(struct MPContext *mpctx, struct mp_cancel *cancel);
struct track *select_default_track(struct MPContext *mpctx, int order,
enum stream_type type);
void prefetch_next(struct MPContext *mpctx);
void close_recorder(struct MPContext *mpctx);
void close_recorder_and_error(struct MPContext *mpctx);
void open_recorder(struct MPContext *mpctx, bool on_init);
void update_lavfi_complex(struct MPContext *mpctx);
// main.c
int mp_initialize(struct MPContext *mpctx, char **argv);
struct MPContext *mp_create(void);
void mp_destroy(struct MPContext *mpctx);
void mp_print_version(struct mp_log *log, int always);
void mp_update_logging(struct MPContext *mpctx, bool preinit);
void issue_refresh_seek(struct MPContext *mpctx, enum seek_precision min_prec);
// misc.c
double rel_time_to_abs(struct MPContext *mpctx, struct m_rel_time t);
double get_play_end_pts(struct MPContext *mpctx);
double get_play_start_pts(struct MPContext *mpctx);
double get_ab_loop_start_time(struct MPContext *mpctx);
void merge_playlist_files(struct playlist *pl);
void update_vo_playback_state(struct MPContext *mpctx);
void update_window_title(struct MPContext *mpctx, bool force);
void error_on_track(struct MPContext *mpctx, struct track *track);
int stream_dump(struct MPContext *mpctx, const char *source_filename);
double get_track_seek_offset(struct MPContext *mpctx, struct track *track);
// osd.c
void set_osd_bar(struct MPContext *mpctx, int type,
double min, double max, double neutral, double val);
bool set_osd_msg(struct MPContext *mpctx, int level, int time,
const char* fmt, ...) PRINTF_ATTRIBUTE(4,5);
void set_osd_function(struct MPContext *mpctx, int osd_function);
void term_osd_set_subs(struct MPContext *mpctx, const char *text);
void get_current_osd_sym(struct MPContext *mpctx, char *buf, size_t buf_size);
void set_osd_bar_chapters(struct MPContext *mpctx, int type);
// playloop.c
void mp_wait_events(struct MPContext *mpctx);
void mp_set_timeout(struct MPContext *mpctx, double sleeptime);
void mp_wakeup_core(struct MPContext *mpctx);
void mp_wakeup_core_cb(void *ctx);
void mp_core_lock(struct MPContext *mpctx);
void mp_core_unlock(struct MPContext *mpctx);
void mp_process_input(struct MPContext *mpctx);
double get_relative_time(struct MPContext *mpctx);
void reset_playback_state(struct MPContext *mpctx);
void set_pause_state(struct MPContext *mpctx, bool user_pause);
void update_internal_pause_state(struct MPContext *mpctx);
void update_core_idle_state(struct MPContext *mpctx);
void add_step_frame(struct MPContext *mpctx, int dir);
void queue_seek(struct MPContext *mpctx, enum seek_type type, double amount,
enum seek_precision exact, int flags);
double get_time_length(struct MPContext *mpctx);
double get_current_time(struct MPContext *mpctx);
double get_playback_time(struct MPContext *mpctx);
int get_percent_pos(struct MPContext *mpctx);
double get_current_pos_ratio(struct MPContext *mpctx, bool use_range);
int get_current_chapter(struct MPContext *mpctx);
char *chapter_display_name(struct MPContext *mpctx, int chapter);
char *chapter_name(struct MPContext *mpctx, int chapter);
double chapter_start_time(struct MPContext *mpctx, int chapter);
int get_chapter_count(struct MPContext *mpctx);
int get_cache_buffering_percentage(struct MPContext *mpctx);
void execute_queued_seek(struct MPContext *mpctx);
void run_playloop(struct MPContext *mpctx);
void mp_idle(struct MPContext *mpctx);
void idle_loop(struct MPContext *mpctx);
int handle_force_window(struct MPContext *mpctx, bool force);
void seek_to_last_frame(struct MPContext *mpctx);
void update_screensaver_state(struct MPContext *mpctx);
// scripting.c
struct mp_scripting {
const char *name; // e.g. "lua script"
const char *file_ext; // e.g. "lua"
int (*load)(struct mpv_handle *client, const char *filename);
};
void mp_load_scripts(struct MPContext *mpctx);
void mp_load_builtin_scripts(struct MPContext *mpctx);
int mp_load_user_script(struct MPContext *mpctx, const char *fname);
// sub.c
void reset_subtitle_state(struct MPContext *mpctx);
void reinit_sub(struct MPContext *mpctx, struct track *track);
void reinit_sub_all(struct MPContext *mpctx);
void uninit_sub(struct MPContext *mpctx, struct track *track);
void uninit_sub_all(struct MPContext *mpctx);
void update_osd_msg(struct MPContext *mpctx);
bool update_subtitles(struct MPContext *mpctx, double video_pts);
// video.c
int video_get_colors(struct vo_chain *vo_c, const char *item, int *value);
int video_set_colors(struct vo_chain *vo_c, const char *item, int value);
void reset_video_state(struct MPContext *mpctx);
int init_video_decoder(struct MPContext *mpctx, struct track *track);
void reinit_video_chain(struct MPContext *mpctx);
void reinit_video_chain_src(struct MPContext *mpctx, struct track *track);
int reinit_video_filters(struct MPContext *mpctx);
void write_video(struct MPContext *mpctx);
void mp_force_video_refresh(struct MPContext *mpctx);
void uninit_video_out(struct MPContext *mpctx);
void uninit_video_chain(struct MPContext *mpctx);
double calc_average_frame_duration(struct MPContext *mpctx);
int init_video_decoder(struct MPContext *mpctx, struct track *track);
#endif /* MPLAYER_MP_CORE_H */
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