1 files changed, 145 insertions, 0 deletions
diff --git a/libavformat/demux.h b/libavformat/demux.h
new file mode 100644
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+++ b/libavformat/demux.h
@@ -0,0 +1,145 @@
+/*
+ * copyright (c) 2001 Fabrice Bellard
+ *
+ * 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
+ */
+
+#ifndef AVFORMAT_DEMUX_H
+#define AVFORMAT_DEMUX_H
+
+#include <stdint.h>
+#include "libavutil/rational.h"
+#include "libavcodec/packet.h"
+#include "avformat.h"
+
+#define RELATIVE_TS_BASE (INT64_MAX - (1LL << 48))
+
+static av_always_inline int is_relative(int64_t ts)
+{
+    return ts > (RELATIVE_TS_BASE - (1LL << 48));
+}
+
+/**
+ * Wrap a given time stamp, if there is an indication for an overflow
+ *
+ * @param st stream
+ * @param timestamp the time stamp to wrap
+ * @return resulting time stamp
+ */
+int64_t ff_wrap_timestamp(const AVStream *st, int64_t timestamp);
+
+/**
+ * Read a transport packet from a media file.
+ *
+ * @param s media file handle
+ * @param pkt is filled
+ * @return 0 if OK, AVERROR_xxx on error
+ */
+int ff_read_packet(AVFormatContext *s, AVPacket *pkt);
+
+void ff_read_frame_flush(AVFormatContext *s);
+
+/**
+ * Perform a binary search using av_index_search_timestamp() and
+ * AVInputFormat.read_timestamp().
+ *
+ * @param target_ts target timestamp in the time base of the given stream
+ * @param stream_index stream number
+ */
+int ff_seek_frame_binary(AVFormatContext *s, int stream_index,
+                         int64_t target_ts, int flags);
+
+/**
+ * Update cur_dts of all streams based on the given timestamp and AVStream.
+ *
+ * Stream ref_st unchanged, others set cur_dts in their native time base.
+ * Only needed for timestamp wrapping or if (dts not set and pts!=dts).
+ * @param timestamp new dts expressed in time_base of param ref_st
+ * @param ref_st reference stream giving time_base of param timestamp
+ */
+void avpriv_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
+
+int ff_find_last_ts(AVFormatContext *s, int stream_index, int64_t *ts, int64_t *pos,
+                    int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
+
+/**
+ * Perform a binary search using read_timestamp().
+ *
+ * @param target_ts target timestamp in the time base of the given stream
+ * @param stream_index stream number
+ */
+int64_t ff_gen_search(AVFormatContext *s, int stream_index,
+                      int64_t target_ts, int64_t pos_min,
+                      int64_t pos_max, int64_t pos_limit,
+                      int64_t ts_min, int64_t ts_max,
+                      int flags, int64_t *ts_ret,
+                      int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
+
+/**
+ * Internal version of av_index_search_timestamp
+ */
+int ff_index_search_timestamp(const AVIndexEntry *entries, int nb_entries,
+                              int64_t wanted_timestamp, int flags);
+
+/**
+ * Internal version of av_add_index_entry
+ */
+int ff_add_index_entry(AVIndexEntry **index_entries,
+                       int *nb_index_entries,
+                       unsigned int *index_entries_allocated_size,
+                       int64_t pos, int64_t timestamp, int size, int distance, int flags);
+
+void ff_configure_buffers_for_index(AVFormatContext *s, int64_t time_tolerance);
+
+/**
+ * Ensure the index uses less memory than the maximum specified in
+ * AVFormatContext.max_index_size by discarding entries if it grows
+ * too large.
+ */
+void ff_reduce_index(AVFormatContext *s, int stream_index);
+
+/**
+ * add frame for rfps calculation.
+ *
+ * @param dts timestamp of the i-th frame
+ * @return 0 if OK, AVERROR_xxx on error
+ */
+int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t dts);
+
+void ff_rfps_calculate(AVFormatContext *ic);
+
+/**
+ * Rescales a timestamp and the endpoints of an interval to which the temstamp
+ * belongs, from a timebase `tb_in` to a timebase `tb_out`.
+ *
+ * The upper (lower) bound of the output interval is rounded up (down) such that
+ * the output interval always falls within the intput interval. The timestamp is
+ * rounded to the nearest integer and halfway cases away from zero, and can
+ * therefore fall outside of the output interval.
+ *
+ * Useful to simplify the rescaling of the arguments of AVInputFormat::read_seek2()
+ *
+ * @param[in] tb_in      Timebase of the input `min_ts`, `ts` and `max_ts`
+ * @param[in] tb_out     Timebase of the ouput `min_ts`, `ts` and `max_ts`
+ * @param[in,out] min_ts Lower bound of the interval
+ * @param[in,out] ts     Timestamp
+ * @param[in,out] max_ts Upper bound of the interval
+ */
+void ff_rescale_interval(AVRational tb_in, AVRational tb_out,
+                         int64_t *min_ts, int64_t *ts, int64_t *max_ts);
+
+#endif /* AVFORMAT_DEMUX_H */