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https://github.com/FFmpeg/FFmpeg.git
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c0f867bf50
Change some internal APIs a bit to make it harder to make such mistakes. In particular, have the read chunk functions return an error when the result is incomplete. This might be less flexible, but since there has been no use-case for that so far, avoiding coding mistakes seems better. Add a function to queue a AVBPrint directly (ff_subtitles_queue_insert_bprint). Also fixes a leak in lrcdec when ff_subtitles_queue_insert fails. Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
185 lines
5.4 KiB
C
185 lines
5.4 KiB
C
/*
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* Copyright (c) 2012 Clément Bœsch
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* MPlayer subtitles format demuxer
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*/
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#include "avformat.h"
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#include "internal.h"
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#include "subtitles.h"
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#define TSBASE 10000000
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typedef struct {
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FFDemuxSubtitlesQueue q;
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} MPSubContext;
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static int mpsub_probe(const AVProbeData *p)
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{
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const char *ptr = p->buf;
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const char *ptr_end = p->buf + p->buf_size;
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while (ptr < ptr_end) {
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int inc;
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if (!memcmp(ptr, "FORMAT=TIME", 11))
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return AVPROBE_SCORE_EXTENSION;
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if (!memcmp(ptr, "FORMAT=", 7))
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return AVPROBE_SCORE_EXTENSION / 3;
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inc = ff_subtitles_next_line(ptr);
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if (!inc)
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break;
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ptr += inc;
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}
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return 0;
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}
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static int parse_line(const char *line, int64_t *value, int64_t *value2)
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{
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int vi, p1, p2;
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for (vi = 0; vi < 2; vi++) {
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long long intval, fracval;
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int n = av_sscanf(line, "%lld%n.%lld%n", &intval, &p1, &fracval, &p2);
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if (n <= 0 || intval < INT64_MIN / TSBASE || intval > INT64_MAX / TSBASE)
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return AVERROR_INVALIDDATA;
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intval *= TSBASE;
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if (n == 2) {
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if (fracval < 0)
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return AVERROR_INVALIDDATA;
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for (;p2 - p1 < 7 + 1; p1--)
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fracval *= 10;
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for (;p2 - p1 > 7 + 1; p1++)
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fracval /= 10;
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if (intval > 0) intval = av_sat_add64(intval, fracval);
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else intval = av_sat_sub64(intval, fracval);
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line += p2;
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} else
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line += p1;
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*value = intval;
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value = value2;
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}
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return 0;
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}
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static int mpsub_read_header(AVFormatContext *s)
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{
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MPSubContext *mpsub = s->priv_data;
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AVStream *st;
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AVBPrint buf;
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AVRational pts_info = (AVRational){ TSBASE, 1 }; // ts based by default
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int res = 0;
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int64_t current_pts = 0;
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int i;
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int common_factor = 0;
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av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
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while (!avio_feof(s->pb)) {
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char line[1024];
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int64_t start, duration;
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int fps, len = ff_get_line(s->pb, line, sizeof(line));
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if (!len)
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break;
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line[strcspn(line, "\r\n")] = 0;
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if (sscanf(line, "FORMAT=%d", &fps) == 1 && fps > 3 && fps < 100) {
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/* frame based timing */
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pts_info = (AVRational){ TSBASE * fps, 1 };
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} else if (parse_line(line, &start, &duration) >= 0) {
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AVPacket *sub;
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const int64_t pos = avio_tell(s->pb);
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res = ff_subtitles_read_chunk(s->pb, &buf);
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if (res < 0) goto end;
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if (buf.len) {
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sub = ff_subtitles_queue_insert_bprint(&mpsub->q, &buf, 0);
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if (!sub) {
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res = AVERROR(ENOMEM);
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goto end;
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}
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if ( current_pts < 0 && start < INT64_MIN - current_pts
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|| current_pts > 0 && start > INT64_MAX - current_pts) {
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res = AVERROR_INVALIDDATA;
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goto end;
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}
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sub->pts = current_pts + start;
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if (duration < 0 || sub->pts > INT64_MAX - duration) {
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res = AVERROR_INVALIDDATA;
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goto end;
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}
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sub->duration = duration;
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common_factor = av_gcd(duration, common_factor);
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common_factor = av_gcd(sub->pts, common_factor);
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current_pts = sub->pts + duration;
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sub->pos = pos;
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}
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}
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}
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if (common_factor > 1) {
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common_factor = av_gcd(pts_info.num, common_factor);
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for (i = 0; i < mpsub->q.nb_subs; i++) {
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mpsub->q.subs[i]->pts /= common_factor;
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mpsub->q.subs[i]->duration /= common_factor;
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}
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pts_info.num /= common_factor;
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}
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st = avformat_new_stream(s, NULL);
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if (!st) {
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res = AVERROR(ENOMEM);
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goto end;
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}
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avpriv_set_pts_info(st, 64, pts_info.den, pts_info.num);
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st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
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st->codecpar->codec_id = AV_CODEC_ID_TEXT;
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ff_subtitles_queue_finalize(s, &mpsub->q);
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end:
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av_bprint_finalize(&buf, NULL);
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return res;
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}
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const AVInputFormat ff_mpsub_demuxer = {
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.name = "mpsub",
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.long_name = NULL_IF_CONFIG_SMALL("MPlayer subtitles"),
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.priv_data_size = sizeof(MPSubContext),
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.flags_internal = FF_FMT_INIT_CLEANUP,
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.read_probe = mpsub_probe,
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.read_header = mpsub_read_header,
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.extensions = "sub",
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.read_packet = ff_subtitles_read_packet,
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.read_seek2 = ff_subtitles_read_seek,
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.read_close = ff_subtitles_read_close,
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};
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