ffmpeg-2.1.1: move directory

git-svn-id: svn://kolibrios.org@6148 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/ffmpeg/ffmpeg-2.1/libavformat/microdvddec.c

@@ -0,0 +1,167 @@
+/*
+ * MicroDVD subtitle demuxer
+ * Copyright (c) 2010  Aurelien Jacobs <aurel@gnuage.org>
+ * Copyright (c) 2012  Clément Bœsch <u pkh me>
+ *
+ * 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
+ */
+
+#include "avformat.h"
+#include "internal.h"
+#include "subtitles.h"
+#include "libavutil/intreadwrite.h"
+
+#define MAX_LINESIZE 2048
+
+
+typedef struct {
+    FFDemuxSubtitlesQueue q;
+} MicroDVDContext;
+
+
+static int microdvd_probe(AVProbeData *p)
+{
+    unsigned char c;
+    const uint8_t *ptr = p->buf;
+    int i;
+
+    if (AV_RB24(ptr) == 0xEFBBBF)
+        ptr += 3;  /* skip UTF-8 BOM */
+
+    for (i=0; i<3; i++) {
+        if (sscanf(ptr, "{%*d}{}%c",     &c) != 1 &&
+            sscanf(ptr, "{%*d}{%*d}%c",  &c) != 1 &&
+            sscanf(ptr, "{DEFAULT}{}%c", &c) != 1)
+            return 0;
+        ptr += ff_subtitles_next_line(ptr);
+    }
+    return AVPROBE_SCORE_MAX;
+}
+
+static int64_t get_pts(const char *buf)
+{
+    int frame;
+    char c;
+
+    if (sscanf(buf, "{%d}{%c", &frame, &c) == 2)
+        return frame;
+    return AV_NOPTS_VALUE;
+}
+
+static int get_duration(const char *buf)
+{
+    int frame_start, frame_end;
+
+    if (sscanf(buf, "{%d}{%d}", &frame_start, &frame_end) == 2)
+        return frame_end - frame_start;
+    return -1;
+}
+
+static int microdvd_read_header(AVFormatContext *s)
+{
+    AVRational pts_info = (AVRational){ 2997, 125 };  /* default: 23.976 fps */
+    MicroDVDContext *microdvd = s->priv_data;
+    AVStream *st = avformat_new_stream(s, NULL);
+    int i = 0;
+    char line[MAX_LINESIZE];
+
+    if (!st)
+        return AVERROR(ENOMEM);
+
+    while (!url_feof(s->pb)) {
+        char *p = line;
+        AVPacket *sub;
+        int64_t pos = avio_tell(s->pb);
+        int len = ff_get_line(s->pb, line, sizeof(line));
+
+        if (!len)
+            break;
+        line[strcspn(line, "\r\n")] = 0;
+        if (i++ < 3) {
+            int frame;
+            double fps;
+            char c;
+
+            if ((sscanf(line, "{%d}{}%6lf",    &frame, &fps) == 2 ||
+                 sscanf(line, "{%d}{%*d}%6lf", &frame, &fps) == 2)
+                && frame <= 1 && fps > 3 && fps < 100)
+                pts_info = av_d2q(fps, 100000);
+            if (!st->codec->extradata && sscanf(line, "{DEFAULT}{}%c", &c) == 1) {
+                st->codec->extradata = av_strdup(line + 11);
+                if (!st->codec->extradata)
+                    return AVERROR(ENOMEM);
+                st->codec->extradata_size = strlen(st->codec->extradata) + 1;
+                continue;
+            }
+        }
+#define SKIP_FRAME_ID                                       \
+    p = strchr(p, '}');                                     \
+    if (!p) {                                               \
+        av_log(s, AV_LOG_WARNING, "Invalid event \"%s\""    \
+               " at line %d\n", line, i);                   \
+        continue;                                           \
+    }                                                       \
+    p++
+        SKIP_FRAME_ID;
+        SKIP_FRAME_ID;
+        if (!*p)
+            continue;
+        sub = ff_subtitles_queue_insert(&microdvd->q, p, strlen(p), 0);
+        if (!sub)
+            return AVERROR(ENOMEM);
+        sub->pos = pos;
+        sub->pts = get_pts(line);
+        sub->duration = get_duration(line);
+    }
+    ff_subtitles_queue_finalize(&microdvd->q);
+    avpriv_set_pts_info(st, 64, pts_info.den, pts_info.num);
+    st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
+    st->codec->codec_id   = AV_CODEC_ID_MICRODVD;
+    return 0;
+}
+
+static int microdvd_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    MicroDVDContext *microdvd = s->priv_data;
+    return ff_subtitles_queue_read_packet(&microdvd->q, pkt);
+}
+
+static int microdvd_read_seek(AVFormatContext *s, int stream_index,
+                             int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
+{
+    MicroDVDContext *microdvd = s->priv_data;
+    return ff_subtitles_queue_seek(&microdvd->q, s, stream_index,
+                                   min_ts, ts, max_ts, flags);
+}
+
+static int microdvd_read_close(AVFormatContext *s)
+{
+    MicroDVDContext *microdvd = s->priv_data;
+    ff_subtitles_queue_clean(&microdvd->q);
+    return 0;
+}
+
+AVInputFormat ff_microdvd_demuxer = {
+    .name           = "microdvd",
+    .long_name      = NULL_IF_CONFIG_SMALL("MicroDVD subtitle format"),
+    .priv_data_size = sizeof(MicroDVDContext),
+    .read_probe     = microdvd_probe,
+    .read_header    = microdvd_read_header,
+    .read_packet    = microdvd_read_packet,
+    .read_seek2     = microdvd_read_seek,
+    .read_close     = microdvd_read_close,
+};