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Each subtitle track gets its own decoder instance (sd_ass). But they use a shared ASS_Renderer. This is done mainly because of fontconfig. Initializing fontconfig is very slow when using it with memory fonts, so there's a practical need to cache this memory font state, which is done by not creating separate ASS_Renderers. This is very dirty and very evil, but we probably can't get rid of it any time soon. The shared ASS_Renderer was not properly synchronized. While the program logic guarantees that only one sd_ass instance is visible at a time, there are other interactions that require synchronization. In particular, I suspect concurrent execution of mp_ass_configure_fonts() and sd_ass.get_bitmaps cause issues in a newer libass development branch. So here's a shitty hack that hopefully fixes things, hopefully only until libass becomes less dependent on fontconfig.
76 lines
2.1 KiB
C
76 lines
2.1 KiB
C
#ifndef MPLAYER_SD_H
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#define MPLAYER_SD_H
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#include "dec_sub.h"
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#include "demux/packet.h"
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struct sd {
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struct mp_log *log;
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struct MPOpts *opts;
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const struct sd_functions *driver;
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void *priv;
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const char *codec;
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// Extra header data passed from demuxer
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char *extradata;
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int extradata_len;
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// Set to !=NULL if the input packets are being converted from another
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// format.
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const char *converted_from;
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// Video resolution used for subtitle decoding. Doesn't necessarily match
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// the resolution of the VO, nor does it have to be the OSD resolution.
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int sub_video_w, sub_video_h;
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// Shared renderer for ASS - done to avoid reloading embedded fonts.
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struct ass_library *ass_library;
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struct ass_renderer *ass_renderer;
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pthread_mutex_t *ass_lock;
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// If false, try to remove multiple subtitles.
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// (Only for decoders which have accept_packets_in_advance set.)
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bool no_remove_duplicates;
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// Set by sub converter
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const char *output_codec;
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char *output_extradata;
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int output_extradata_len;
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// Internal buffer for sd_conv_* functions
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struct sd_conv_buffer *sd_conv_buffer;
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};
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struct sd_functions {
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const char *name;
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bool accept_packets_in_advance;
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bool (*supports_format)(const char *format);
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int (*init)(struct sd *sd);
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void (*decode)(struct sd *sd, struct demux_packet *packet);
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void (*reset)(struct sd *sd);
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void (*uninit)(struct sd *sd);
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void (*fix_events)(struct sd *sd);
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int (*control)(struct sd *sd, enum sd_ctrl cmd, void *arg);
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// decoder
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void (*get_bitmaps)(struct sd *sd, struct mp_osd_res dim, double pts,
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struct sub_bitmaps *res);
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char *(*get_text)(struct sd *sd, double pts);
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// converter
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struct demux_packet *(*get_converted)(struct sd *sd);
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};
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void sd_conv_add_packet(struct sd *sd, void *data, int data_len, double pts,
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double duration);
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struct demux_packet *sd_conv_def_get_converted(struct sd *sd);
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void sd_conv_def_reset(struct sd *sd);
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void sd_conv_def_uninit(struct sd *sd);
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#define SD_MAX_LINE_LEN 1000
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#endif
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