mirror of
https://github.com/mpv-player/mpv.git
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7bb10e7ce2
Originally, when rendering plaintext subs with libass, the subtitles were first converted to the "struct subtitle" form with sub_add_text() and then from that to libass events. Change sd_ass to convert the subtitles directly to libass events without using the old sub machinery. The new conversion at least fixes some timing issues. Also use the markup support added in the previous commit, so that HTML-style markup is also supported in "plaintext" subs rendered with libass.
153 lines
4.4 KiB
C
153 lines
4.4 KiB
C
/*
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* This file is part of MPlayer.
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*
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* MPlayer is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* MPlayer is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with MPlayer; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <stdlib.h>
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#include <ass/ass.h>
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#include <assert.h>
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#include <string.h>
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#include "talloc.h"
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#include "mpcommon.h"
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#include "libmpdemux/stheader.h"
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#include "libvo/sub.h"
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#include "ass_mp.h"
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#include "sd.h"
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#include "subassconvert.h"
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struct sd_ass_priv {
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struct ass_track *ass_track;
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bool incomplete_event;
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};
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static void free_last_event(ASS_Track *track)
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{
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assert(track->n_events > 0);
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ass_free_event(track, track->n_events - 1);
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track->n_events--;
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}
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static void init(struct sh_sub *sh, struct osd_state *osd)
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{
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struct sd_ass_priv *ctx;
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if (sh->initialized) {
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ctx = sh->context;
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} else {
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ctx = talloc_zero(NULL, struct sd_ass_priv);
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sh->context = ctx;
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if (sh->type == 'a') {
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ctx->ass_track = ass_new_track(ass_library);
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if (sh->extradata)
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ass_process_codec_private(ctx->ass_track, sh->extradata,
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sh->extradata_len);
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} else
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ctx->ass_track = ass_default_track(ass_library);
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}
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assert(osd->ass_track == NULL);
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osd->ass_track = ctx->ass_track;
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}
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static void decode(struct sh_sub *sh, struct osd_state *osd, void *data,
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int data_len, double pts, double duration)
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{
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unsigned char *text = data;
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struct sd_ass_priv *ctx = sh->context;
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ASS_Track *track = ctx->ass_track;
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if (sh->type == 'a') { // ssa/ass subs
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ass_process_chunk(track, data, data_len,
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(long long)(pts*1000 + 0.5),
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(long long)(duration*1000 + 0.5));
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return;
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}
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// plaintext subs
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if (pts == MP_NOPTS_VALUE) {
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mp_msg(MSGT_SUBREADER, MSGL_WARN, "Subtitle without pts, ignored\n");
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return;
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}
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long long ipts = pts * 1000 + 0.5;
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long long iduration = duration * 1000 + 0.5;
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if (ctx->incomplete_event) {
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ctx->incomplete_event = false;
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ASS_Event *event = track->events + track->n_events - 1;
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if (ipts <= event->Start)
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free_last_event(track);
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else
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event->Duration = ipts - event->Start;
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}
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// Note: we rely on there being guaranteed 0 bytes after data packets
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int len = strlen(text);
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if (len < 5) {
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// Some tracks use a whitespace (but not empty) packet to mark end
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// of previous subtitle.
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for (int i = 0; i < len; i++)
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if (!strchr(" \f\n\r\t\v", text[i]))
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goto not_all_whitespace;
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return;
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}
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not_all_whitespace:;
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char buf[500];
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subassconvert_subrip(text, buf, sizeof(buf));
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for (int i = 0; i < track->n_events; i++)
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if (track->events[i].Start == ipts
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&& (duration <= 0 || track->events[i].Duration == iduration)
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&& strcmp(track->events[i].Text, buf) == 0)
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return; // We've already added this subtitle
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if (duration <= 0) {
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iduration = 10000;
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ctx->incomplete_event = true;
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}
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int eid = ass_alloc_event(track);
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ASS_Event *event = track->events + eid;
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event->Start = ipts;
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event->Duration = iduration;
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event->Text = strdup(buf);
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}
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static void reset(struct sh_sub *sh, struct osd_state *osd)
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{
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struct sd_ass_priv *ctx = sh->context;
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if (ctx->incomplete_event)
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free_last_event(ctx->ass_track);
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ctx->incomplete_event = false;
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}
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static void switch_off(struct sh_sub *sh, struct osd_state *osd)
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{
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reset(sh, osd);
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osd->ass_track = NULL;
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}
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static void uninit(struct sh_sub *sh)
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{
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struct sd_ass_priv *ctx = sh->context;
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ass_free_track(ctx->ass_track);
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talloc_free(ctx);
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}
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const struct sd_functions sd_ass = {
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.init = init,
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.decode = decode,
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.reset = reset,
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.switch_off = switch_off,
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.uninit = uninit,
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};
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