mirror of https://github.com/mpv-player/mpv
111 lines
3.6 KiB
C
111 lines
3.6 KiB
C
/*
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* This file is part of mpv.
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*
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* mpv 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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* mpv 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 mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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// Note: just wraps libass, and makes the subtitle track available though
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// sh_sub->track. It doesn't produce packets and doesn't support seeking.
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#include <ass/ass.h>
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#include <ass/ass_types.h>
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#include "options/options.h"
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#include "common/msg.h"
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#include "misc/charset_conv.h"
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#include "stream/stream.h"
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#include "demux.h"
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#define PROBE_SIZE (8 * 1024)
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static void message_callback(int level, const char *format, va_list va, void *ctx)
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{
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// ignore
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}
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static int d_check_file(struct demuxer *demuxer, enum demux_check check)
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{
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const char *user_cp = demuxer->opts->sub_cp;
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struct stream *s = demuxer->stream;
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struct mp_log *log = demuxer->log;
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if (!demuxer->params || !demuxer->params->expect_subtitle)
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return -1;
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if (check >= DEMUX_CHECK_UNSAFE) {
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ASS_Library *lib = ass_library_init();
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if (!lib)
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return -1;
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ass_set_message_cb(lib, message_callback, NULL);
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// Probe by loading a part of the beginning of the file with libass.
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// Incomplete scripts are usually ok, and we hope libass is not verbose
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// when dealing with (from its perspective) completely broken binary
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// garbage.
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bstr buf = stream_peek(s, PROBE_SIZE);
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// Older versions of libass will overwrite the input buffer, and despite
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// passing length, expect a 0 termination.
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void *tmp = talloc_size(NULL, buf.len + 1);
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memcpy(tmp, buf.start, buf.len);
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buf.start = tmp;
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buf.start[buf.len] = '\0';
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bstr cbuf = mp_charset_guess_and_conv_to_utf8(log, buf, user_cp,
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MP_ICONV_ALLOW_CUTOFF);
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if (cbuf.start == NULL)
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cbuf = buf;
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ASS_Track *track = ass_read_memory(lib, cbuf.start, cbuf.len, NULL);
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bool ok = !!track;
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if (cbuf.start != buf.start)
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talloc_free(cbuf.start);
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talloc_free(buf.start);
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if (track)
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ass_free_track(track);
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ass_library_done(lib);
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if (!ok)
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return -1;
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}
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// Actually load the full thing.
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bstr buf = stream_read_complete(s, NULL, 100000000);
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if (!buf.start) {
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MP_ERR(demuxer, "Refusing to load subtitle file "
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"larger than 100 MB: %s\n", demuxer->filename);
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return -1;
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}
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bstr cbuf = mp_charset_guess_and_conv_to_utf8(log, buf, user_cp,
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MP_ICONV_VERBOSE);
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if (cbuf.start == NULL)
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cbuf = buf;
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if (cbuf.start != buf.start)
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talloc_free(buf.start);
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talloc_steal(demuxer, cbuf.start);
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struct sh_stream *sh = new_sh_stream(demuxer, STREAM_SUB);
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sh->codec = "ass";
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sh->sub->extradata = cbuf.start;
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sh->sub->extradata_len = cbuf.len;
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demuxer->seekable = true;
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return 0;
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}
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const struct demuxer_desc demuxer_desc_libass = {
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.name = "libass",
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.desc = "ASS/SSA subtitles (libass)",
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.open = d_check_file,
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};
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