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mpv/player/core.h
wm4 05b2cd08dc sub: make preloading more robust 
Subtitles can be preloaded, which means they're fully read and copied
into ASS_Track. This in turn is mainly for the sake of being able to do
subtitle seeking (when it comes down to it, subtitle seeking is the
cause for most trouble here).

Commit a714f8e92 broke preloaded subtitles which have events with
unknown duration, such as some MicroDVD samples. The event list gets
cleared on every seek, so the property of being preloaded obviously gets
lost.

Fix this by moving most of the preloading logic to dec_sub.c. If the
subtitle list gets cleared, they are not considered preloaded anymore,
and the logic for demuxed subtitles is used.

As another minor thing, preloadeding subtitles did neither disable the
demux stream, nor did it discard packets. Thus you could get queue
overflows in theory (harmless, but annoying). Fix this by explicitly
discarding packets in preloaded mode.

In summary, now the only difference between preloaded and normal
demuxing are:
1. a seek is issued, and all packets are read on start
2. during playback, discard the packets instead of feeding them to the
   subtitle decoder

This is still petty annoying. It would be nice if maintaining the
subtitle index (and maybe a subtitle packet cache for instant subtitle
presentation when seeking back) could be maintained in the demuxer
instead. Half of all file formats with interleaved subtitles have
this anyway (mp4, mkv muxed with newer mkvmerge).
2016-03-06 15:17:59 +01:00

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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 "audio/audio.h"
#include "video/mp_image.h"
#include "video/out/vo.h"
#include "lavfi.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,
MPSEEK_BACKSTEP,
};
enum seek_precision {
MPSEEK_DEFAULT = 0,
// The following values are numerically sorted by increasing precision
MPSEEK_KEYFRAME,
MPSEEK_EXACT,
MPSEEK_VERY_EXACT,
};
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;
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;
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 dec_video *d_video;
struct dec_audio *d_audio;
// 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 lavfi_pad *sink;
};
// Summarizes video filtering and output.
struct vo_chain {
struct mp_log *log;
struct mp_hwdec_info *hwdec_info;
double container_fps;
struct vf_chain *vf;
struct vo *vo;
// 1-element input frame queue.
struct mp_image *input_mpi;
// Last known input_mpi format (so vf can be reinitialized any time).
struct mp_image_params input_format;
struct track *track;
struct lavfi_pad *filter_src;
struct dec_video *video_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;
};
// Like vo_chain, for audio.
struct ao_chain {
struct mp_log *log;
double pts; // timestamp of first sample output by decoder
bool spdif_passthrough, spdif_failed;
bool pts_reset;
struct af_stream *af;
struct ao *ao;
struct mp_audio_buffer *ao_buffer;
// 1-element input frame queue.
struct mp_audio *input_frame;
// Last known input_mpi format (so vf can be reinitialized any time).
struct mp_audio input_format;
struct track *track;
struct lavfi_pad *filter_src;
struct dec_audio *audio_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 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;
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;
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;
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 lavfi *lavfi;
struct mixer *mixer;
struct ao *ao;
struct mp_audio *ao_decoder_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;
// 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_framedrop; // allow decoder to drop frames before hrseek_pts
bool hrseek_lastframe; // drop everything until last frame reached
bool hrseek_backstep; // go to frame before seek target
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;
// Used to compute the number of frames dropped in a row.
int dropped_frames_start;
// 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;
// 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 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;
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 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 lavfi_pad *src);
// 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);
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_stream(struct MPContext *mpctx, struct track *track);
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 rel_time_to_abs(struct MPContext *mpctx, struct m_rel_time t);
double get_play_end_pts(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_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);
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 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, double sleeptime);
void mp_process_input(struct MPContext *mpctx);
double get_relative_time(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);
int handle_force_window(struct MPContext *mpctx, bool force);
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 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);
int video_vf_vo_control(struct vo_chain *vo_c, int vf_cmd, void *data);
void reset_video_state(struct MPContext *mpctx);
int init_video_decoder(struct MPContext *mpctx, struct track *track);
int reinit_video_chain(struct MPContext *mpctx);
int reinit_video_chain_src(struct MPContext *mpctx, struct lavfi_pad *src);
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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