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-rw-r--r--libavformat/microdvddec.c204
1 files changed, 204 insertions, 0 deletions
diff --git a/libavformat/microdvddec.c b/libavformat/microdvddec.c
new file mode 100644
index 0000000000..a3839051a4
--- /dev/null
+++ b/libavformat/microdvddec.c
@@ -0,0 +1,204 @@
+/*
+ * 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"
+#include "libavutil/opt.h"
+
+#define MAX_LINESIZE 2048
+
+
+typedef struct {
+ const AVClass *class;
+ FFDemuxSubtitlesQueue q;
+ AVRational frame_rate;
+} 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 const char *bom = "\xEF\xBB\xBF";
+
+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_buf[MAX_LINESIZE];
+ int has_real_fps = 0;
+
+ if (!st)
+ return AVERROR(ENOMEM);
+
+ while (!avio_feof(s->pb)) {
+ char *p;
+ AVPacket *sub;
+ int64_t pos = avio_tell(s->pb);
+ int len = ff_get_line(s->pb, line_buf, sizeof(line_buf));
+ char *line = line_buf;
+
+ if (!strncmp(line, bom, 3))
+ line += 3;
+ p = 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);
+ has_real_fps = 1;
+ continue;
+ }
+ 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);
+ if (has_real_fps) {
+ /* export the FPS info only if set in the file */
+ microdvd->frame_rate = pts_info;
+ } else if (microdvd->frame_rate.num) {
+ /* fallback on user specified frame rate */
+ pts_info = microdvd->frame_rate;
+ }
+ 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;
+}
+
+
+#define OFFSET(x) offsetof(MicroDVDContext, x)
+#define SD AV_OPT_FLAG_SUBTITLE_PARAM|AV_OPT_FLAG_DECODING_PARAM
+static const AVOption microdvd_options[] = {
+ { "subfps", "set the movie frame rate fallback", OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, SD },
+ { NULL }
+};
+
+static const AVClass microdvd_class = {
+ .class_name = "microdvddec",
+ .item_name = av_default_item_name,
+ .option = microdvd_options,
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
+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,
+ .priv_class = &microdvd_class,
+};