ffmpeg-2.8.5

git-svn-id: svn://kolibrios.org@6147 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/ffmpeg/ffmpeg-2.8/libavformat/aqtitledec.c

@@ -0,0 +1,148 @@
+/*
+ * Copyright (c) 2012 Clément Bœsch
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * AQTitle subtitles format demuxer
+ *
+ * @see http://web.archive.org/web/20070210095721/http://www.volny.cz/aberka/czech/aqt.html
+ * @see https://trac.annodex.net/wiki/AQTitle
+ */
+
+#include "avformat.h"
+#include "internal.h"
+#include "subtitles.h"
+#include "libavutil/opt.h"
+
+typedef struct {
+    const AVClass *class;
+    FFDemuxSubtitlesQueue q;
+    AVRational frame_rate;
+} AQTitleContext;
+
+static int aqt_probe(AVProbeData *p)
+{
+    int frame;
+    const char *ptr = p->buf;
+
+    if (sscanf(ptr, "-->> %d", &frame) == 1)
+        return AVPROBE_SCORE_EXTENSION;
+    return 0;
+}
+
+static int aqt_read_header(AVFormatContext *s)
+{
+    AQTitleContext *aqt = s->priv_data;
+    AVStream *st = avformat_new_stream(s, NULL);
+    int new_event = 1;
+    int64_t pos = 0, frame = AV_NOPTS_VALUE;
+    AVPacket *sub = NULL;
+
+    if (!st)
+        return AVERROR(ENOMEM);
+    avpriv_set_pts_info(st, 64, aqt->frame_rate.den, aqt->frame_rate.num);
+    st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
+    st->codec->codec_id   = AV_CODEC_ID_TEXT;
+
+    while (!avio_feof(s->pb)) {
+        char line[4096];
+        int len = ff_get_line(s->pb, line, sizeof(line));
+
+        if (!len)
+            break;
+
+        line[strcspn(line, "\r\n")] = 0;
+
+        if (sscanf(line, "-->> %"SCNd64, &frame) == 1) {
+            new_event = 1;
+            pos = avio_tell(s->pb);
+            if (sub) {
+                sub->duration = frame - sub->pts;
+                sub = NULL;
+            }
+        } else if (*line) {
+            if (!new_event) {
+                sub = ff_subtitles_queue_insert(&aqt->q, "\n", 1, 1);
+                if (!sub)
+                    return AVERROR(ENOMEM);
+            }
+            sub = ff_subtitles_queue_insert(&aqt->q, line, strlen(line), !new_event);
+            if (!sub)
+                return AVERROR(ENOMEM);
+            if (new_event) {
+                sub->pts = frame;
+                sub->duration = -1;
+                sub->pos = pos;
+            }
+            new_event = 0;
+        }
+    }
+
+    ff_subtitles_queue_finalize(&aqt->q);
+    return 0;
+}
+
+static int aqt_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    AQTitleContext *aqt = s->priv_data;
+    return ff_subtitles_queue_read_packet(&aqt->q, pkt);
+}
+
+static int aqt_read_seek(AVFormatContext *s, int stream_index,
+                         int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
+{
+    AQTitleContext *aqt = s->priv_data;
+    return ff_subtitles_queue_seek(&aqt->q, s, stream_index,
+                                   min_ts, ts, max_ts, flags);
+}
+
+static int aqt_read_close(AVFormatContext *s)
+{
+    AQTitleContext *aqt = s->priv_data;
+    ff_subtitles_queue_clean(&aqt->q);
+    return 0;
+}
+
+#define OFFSET(x) offsetof(AQTitleContext, x)
+#define SD AV_OPT_FLAG_SUBTITLE_PARAM|AV_OPT_FLAG_DECODING_PARAM
+static const AVOption aqt_options[] = {
+    { "subfps", "set the movie frame rate", OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, {.dbl=25}, 0, INT_MAX, SD },
+    { NULL }
+};
+
+static const AVClass aqt_class = {
+    .class_name = "aqtdec",
+    .item_name  = av_default_item_name,
+    .option     = aqt_options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+AVInputFormat ff_aqtitle_demuxer = {
+    .name           = "aqtitle",
+    .long_name      = NULL_IF_CONFIG_SMALL("AQTitle subtitles"),
+    .priv_data_size = sizeof(AQTitleContext),
+    .read_probe     = aqt_probe,
+    .read_header    = aqt_read_header,
+    .read_packet    = aqt_read_packet,
+    .read_seek2     = aqt_read_seek,
+    .read_close     = aqt_read_close,
+    .extensions     = "aqt",
+    .priv_class     = &aqt_class,
+};