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mpv/player/core.h
wm4 031555fbe6 player: add display sync mode 
If this mode is enabled, the player tries to strictly synchronize video
to display refresh. It will adjust playback speed to match the display,
so if you play 23.976 fps video on a 24 Hz screen, playback speed is
increased by approximately 1/1000. Audio wll be resampled to keep up
with playback.

This is different from the default sync mode, which will sync video to
audio, with the consequence that video might skip or repeat a frame once
in a while to make video keep up with audio.

This is still unpolished. There are some major problems as well; in
particular, mkv VFR files won't work well. The reason is that Matroska
is terrible and rounds timestamps to milliseconds. This makes it rather
hard to guess the framerate of a section of video that is playing. We
could probably fix this by just accepting jittery timestamps (instead
of explicitly disabling the sync code in this case), but I'm not ready
to accept such a solution yet.

Another issue is that we are extremely reliant on OS video and audio
APIs working in an expected manner, which of course is not too often
the case. Consequently, the new sync mode is a bit fragile.
2015-08-10 18:48:45 +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 General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU 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 "libmpv/client.h"
#include "common/common.h"
#include "options/options.h"
#include "sub/osd.h"
#include "demux/timeline.h"
#include "video/out/vo.h"
// definitions used internally by the core player code
enum stop_play_reason {
KEEP_PLAYING = 0, // 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, clear playlist
PT_RELOAD_FILE, // restart playback
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_EDITION = 8,
OSD_SEEK_INFO_CURRENT_FILE = 16,
};
enum {
// other constants
MAX_OSD_LEVEL = 3,
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,
};
enum seek_precision {
MPSEEK_DEFAULT = 0,
// The following values are numerically sorted by increasing precision
MPSEEK_KEYFRAME,
MPSEEK_EXACT,
MPSEEK_VERY_EXACT,
};
// Comes from the assumption that some formats round timestamps to ms.
#define FRAME_DURATION_TOLERANCE 0.0011
enum video_sync {
VS_DEFAULT = 0,
VS_DISP_RESAMPLE,
VS_DISP_RESAMPLE_VDROP,
VS_DISP_RESAMPLE_NONE,
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_VDROP || \
(x) == VS_DISP_NONE)
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;
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
char *external_filename;
bool auto_loaded;
// If the track's stream changes with the timeline (ordered chapters).
bool under_timeline;
// Does not change with under_timeline, but it useless for most purposes.
struct sh_stream *original_stream;
// Value can change if under_timeline==true.
struct demuxer *demuxer;
// Invariant: !stream || stream->demuxer == demuxer
struct sh_stream *stream;
// For external subtitles, which are read fully on init. Do not attempt
// to read packets from them.
bool preloaded;
};
/* 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 autodetach;
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;
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;
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;
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 stream *stream; // stream that was initially opened
struct demuxer **sources; // all open demuxers
int num_sources;
struct timeline *tl;
struct timeline_part *timeline;
int num_timeline_parts;
int timeline_part;
struct demux_chapter *chapters;
int num_chapters;
double video_offset;
struct demuxer *demuxer; // can change with timeline
struct mp_tags *filtered_tags;
struct track **tracks;
int num_tracks;
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 dec_video *d_video;
struct dec_audio *d_audio;
struct dec_sub *d_sub[2];
// Uses: accessing metadata (consider ordered chapters case, where the main
// demuxer defines metadata), or special purpose demuxers like TV.
struct demuxer *master_demuxer;
struct demuxer *track_layout; // complication for ordered chapters
struct mixer *mixer;
struct ao *ao;
struct mp_audio *ao_decoder_fmt; // for weak gapless audio check
struct mp_audio_buffer *ao_buffer; // queued audio; passed to ao_play() later
struct vo *video_out;
// next_frame[0] is the next frame, next_frame[1] the one after that.
struct mp_image *next_frames[VO_MAX_REQ_FRAMES];
int num_next_frames;
struct mp_image *saved_frame; // for hrseek_lastframe
enum playback_status video_status, audio_status;
bool restart_complete;
// 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 broken_fps_header;
double display_sync_frameduration;
int display_sync_drift_dir;
// Timing error (in seconds) due to rounding on vsync boundaries
double display_sync_error;
int display_sync_disable_counter;
/* Set if audio should be timed to start with video frame after seeking,
* not set when e.g. playing cover art */
bool sync_audio_to_video;
bool hrseek_active; // skip all data until hrseek_pts
bool hrseek_framedrop; // allow decoder to drop frames before hrseek_pts
bool hrseek_lastframe; // drop everything until last frame reached
double hrseek_pts;
// 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;
// Total number of dropped frames that were dropped by decoder.
int dropped_frames_total;
// Number of frames dropped in a row.
int dropped_frames;
// 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;
// Mostly unused; for proper audio resync on speed changes.
double video_next_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;
// Video PTS, or audio PTS if video has ended.
double playback_pts;
int last_chapter;
// History of video frames timestamps that were queued in the VO
// This includes even skipped frames during hr-seek
double vo_pts_history_pts[MAX_NUM_VO_PTS];
// Whether the PTS at vo_pts_history[n] is after a seek reset
uint64_t vo_pts_history_seek[MAX_NUM_VO_PTS];
uint64_t vo_pts_history_seek_ts;
uint64_t backstep_start_seek_ts;
bool backstep_active;
double next_heartbeat;
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;
// Used to communicate the parameters of a seek between parts
struct seek_params {
enum seek_type type;
enum seek_precision exact;
double amount;
bool immediate; // disable seek delay logic
} seek;
/* 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;
/* Subtitle renderer. This is separate, because we want to keep fonts
* loaded across ordered chapters, instead of reloading and rescanning
* them on each transition. (Both of these objects contain this state.)
*/
pthread_mutex_t ass_lock;
struct ass_renderer *ass_renderer;
struct ass_library *ass_library;
struct mp_log *ass_log;
int last_dvb_step;
bool paused;
// 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, cache_wait_time;
// Set after showing warning about decoding being too slow for realtime
// playback rate. Used to avoid showing it multiple times.
bool drop_message_shown;
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;
struct mpv_opengl_cb_context *gl_cb_ctx;
} MPContext;
// audio.c
void reset_audio_state(struct MPContext *mpctx);
void reinit_audio_chain(struct MPContext *mpctx);
int reinit_audio_filters(struct MPContext *mpctx);
double playing_audio_pts(struct MPContext *mpctx);
void fill_audio_out_buffers(struct MPContext *mpctx, double endpts);
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);
// 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 uninit_player(struct MPContext *mpctx, unsigned int mask);
struct track *mp_add_external_file(struct MPContext *mpctx, char *filename,
enum stream_type filter);
#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);
double timeline_set_from_time(struct MPContext *mpctx, double pts, bool *need_reset);
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);
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_streams(struct MPContext *mpctx);
void prepare_playlist(struct MPContext *mpctx, struct playlist *pl);
void autoload_external_files(struct MPContext *mpctx);
struct track *select_default_track(struct MPContext *mpctx, int order,
enum stream_type type);
// 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 wakeup_playloop(void *ctx);
// misc.c
double get_start_time(struct MPContext *mpctx);
double get_main_demux_pts(struct MPContext *mpctx);
double get_track_video_offset(struct MPContext *mpctx, struct track *track);
double rel_time_to_abs(struct MPContext *mpctx, struct m_rel_time t);
double get_play_end_pts(struct MPContext *mpctx);
double get_relative_time(struct MPContext *mpctx);
void merge_playlist_files(struct playlist *pl);
float mp_get_cache_percent(struct MPContext *mpctx);
bool mp_get_cache_idle(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);
int mpctx_run_reentrant(struct MPContext *mpctx, void (*thread_fn)(void *arg),
void *thread_arg);
struct mpv_global *create_sub_global(struct MPContext *mpctx);
// 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 set_osd_subtitle(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, double sleeptime);
void mp_process_input(struct MPContext *mpctx);
void reset_playback_state(struct MPContext *mpctx);
void pause_player(struct MPContext *mpctx);
void unpause_player(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, bool immediate);
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);
double 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);
void handle_force_window(struct MPContext *mpctx, bool reconfig);
void add_frame_pts(struct MPContext *mpctx, double pts);
int get_past_frame_durations(struct MPContext *mpctx, double *fd, int num);
void seek_to_last_frame(struct MPContext *mpctx);
// scripting.c
struct mp_scripting {
const char *file_ext; // e.g. "lua"
int (*load)(struct mpv_handle *client, const char *filename);
};
void mp_load_scripts(struct MPContext *mpctx);
// sub.c
void reset_subtitle_state(struct MPContext *mpctx);
void uninit_stream_sub_decoders(struct demuxer *demuxer);
void reinit_subs(struct MPContext *mpctx, int order);
void uninit_sub(struct MPContext *mpctx, int order);
void uninit_sub_all(struct MPContext *mpctx);
void update_osd_msg(struct MPContext *mpctx);
void update_subtitles(struct MPContext *mpctx);
void uninit_sub_renderer(struct MPContext *mpctx);
void update_osd_sub_state(struct MPContext *mpctx, int order,
struct osd_sub_state *out_state);
// video.c
void reset_video_state(struct MPContext *mpctx);
int reinit_video_chain(struct MPContext *mpctx);
int reinit_video_filters(struct MPContext *mpctx);
void write_video(struct MPContext *mpctx, double endpts);
void mp_force_video_refresh(struct MPContext *mpctx);
void uninit_video_out(struct MPContext *mpctx);
void uninit_video_chain(struct MPContext *mpctx);
double stabilize_frame_duration(struct MPContext *mpctx, bool require_exact);
#endif /* MPLAYER_MP_CORE_H */
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