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mpv/sub/dec_sub.h
wm4 92a9f11a0b sub: uglify sub decoder with locking
The plan is to make the whole OSD thread-safe, and we start with this.

We just put locks on all entry points (fortunately, dec_sub.c and all
sd_*.c decoders are very closed off, and only the entry points in
dec_sub.h let you access it). I think this is pretty ugly, but at least
it's very simple.

There's a special case with sub_get_bitmaps(): this function returns
pointers to decoder data (specifically, libass images). There's no way
to synchronize this internally, so expose sub_lock/sub_unlock functions.

To make things simpler, and especially because the lock is sort-of
exposed to the outside world, make the locks recursive. Although the
only case where this is actually needed (although trivial) is
sub_set_extradata().

One corner case are ASS subtitles: for some reason, we keep a single
ASS_Renderer instance for subtitles around (probably to avoid rescanning
fonts with ordered chapters), and this ASS_Renderer instance is not
synchronized. Also, demux_libass.c loads ASS_Track objects, which are
directly passed to sd_ass.c. These things are not synchronized (and
would be hard to synchronize), and basically we're out of luck. But I
think for now, accesses happen reasonably serialized, so there is no
actual problem yet, even if we start to access OSD from other threads.
2014-01-17 23:21:17 +01:00

51 lines
1.5 KiB
C

#ifndef MPLAYER_DEC_SUB_H
#define MPLAYER_DEC_SUB_H
#include <stdbool.h>
#include <stdint.h>
#include "osd.h"
struct sh_stream;
struct ass_track;
struct mpv_global;
struct demux_packet;
struct ass_library;
struct ass_renderer;
struct dec_sub;
struct sd;
enum sd_ctrl {
SD_CTRL_SUB_STEP,
SD_CTRL_SET_VIDEO_PARAMS,
SD_CTRL_GET_RESOLUTION,
};
struct dec_sub *sub_create(struct mpv_global *global);
void sub_destroy(struct dec_sub *sub);
void sub_lock(struct dec_sub *sub);
void sub_unlock(struct dec_sub *sub);
void sub_set_video_res(struct dec_sub *sub, int w, int h);
void sub_set_video_fps(struct dec_sub *sub, double fps);
void sub_set_extradata(struct dec_sub *sub, void *data, int data_len);
void sub_set_ass_renderer(struct dec_sub *sub, struct ass_library *ass_library,
struct ass_renderer *ass_renderer);
void sub_init_from_sh(struct dec_sub *sub, struct sh_stream *sh);
bool sub_is_initialized(struct dec_sub *sub);
bool sub_read_all_packets(struct dec_sub *sub, struct sh_stream *sh);
bool sub_accept_packets_in_advance(struct dec_sub *sub);
void sub_decode(struct dec_sub *sub, struct demux_packet *packet);
void sub_get_bitmaps(struct dec_sub *sub, struct mp_osd_res dim, double pts,
struct sub_bitmaps *res);
bool sub_has_get_text(struct dec_sub *sub);
char *sub_get_text(struct dec_sub *sub, double pts);
void sub_reset(struct dec_sub *sub);
int sub_control(struct dec_sub *sub, enum sd_ctrl cmd, void *arg);
#endif