mirror of
https://github.com/mpv-player/mpv
synced 2024-12-24 07:42:17 +00:00
be882175d8
MPlayer traditionally had completely separate sh_ structs for audio/video/subs, without a good way to share fields. This meant that fields shared across all these headers had to be duplicated. This commit deduplicates essentially the last remaining duplicated fields.
112 lines
3.6 KiB
C
112 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->extradata = cbuf.start;
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sh->extradata_size = cbuf.len;
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demuxer->seekable = true;
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demuxer->fully_read = 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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