lavf: remove unused code

Nothing uses it, and it provides no public API.

Archeological finds:

Commit 101036ad added the API.
Commit a8dd8dc6 made mpegts.c use it.
Commit af8aae3f disabled it by default in mpegts.c.
Commit ae2bb52c removed all uses of this from mpegts.c.
Signed-off-by: Anton Khirnov <anton@khirnov.net>

libavformat/Makefile

@@ -19,7 +19,6 @@ OBJS = allformats.o         \
        os_support.o         \
        riff.o               \
        sdp.o                \
-       seek.o               \
        url.o                \
        utils.o              \
 

libavformat/mpegts.c

@@ -33,7 +33,6 @@
 #include "mpegts.h"
 #include "internal.h"
 #include "avio_internal.h"
-#include "seek.h"
 #include "mpeg.h"
 #include "isom.h"
 

libavformat/seek.h

-/*
- * seek utility functions for use within format handlers
- *
- * Copyright (c) 2009 Ivan Schreter
- *
- * This file is part of Libav.
- *
- * Libav 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.
- *
- * Libav 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 Libav; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#ifndef AVFORMAT_SEEK_H
-#define AVFORMAT_SEEK_H
-
-#include "avformat.h"
-
-/**
- * structure to store parser state of one AVStream
- */
-typedef struct AVParserStreamState {
-    // saved members of AVStream
-    AVCodecParserContext   *parser;
-    int64_t                 last_IP_pts;
-    int64_t                 cur_dts;
-    int                     probe_packets;
-} AVParserStreamState;
-
-/**
- * structure to store parser state of AVFormat
- */
-typedef struct AVParserState {
-    int64_t         fpos;                   ///< file position at the time of call
-
-    // saved members of AVFormatContext
-    AVPacketList   *packet_buffer;          ///< packet buffer of original state
-    AVPacketList   *parse_queue;            ///< parse queue of original state
-    AVPacketList   *raw_packet_buffer;      ///< raw packet buffer of original state
-    int raw_packet_buffer_remaining_size;   ///< remaining space in raw_packet_buffer
-
-    // saved info for streams
-    int                  nb_streams;        ///< number of streams with stored state
-    AVParserStreamState *stream_states;     ///< states of individual streams (array)
-} AVParserState;
-
-/**
- * Search for the sync point of all active streams.
- *
- * This routine is not supposed to be called directly by a user application,
- * but by demuxers.
- *
- * A sync point is defined as a point in stream, such that, when decoding start
- * from this point, the decoded output of all streams synchronizes closest
- * to the given timestamp ts. This routine also takes timestamp limits into account.
- * Thus, the output will synchronize no sooner than ts_min and no later than ts_max.
- *
- * @param stream_index stream index for time base reference of timestamps
- * @param pos          approximate position where to start searching for key frames
- * @param min_ts       minimum allowed timestamp (position, if AVSEEK_FLAG_BYTE set)
- * @param ts           target timestamp (or position, if AVSEEK_FLAG_BYTE set in flags)
- * @param max_ts       maximum allowed timestamp (position, if AVSEEK_FLAG_BYTE set)
- * @param flags        if AVSEEK_FLAG_ANY is set, seek to any frame, otherwise only
- *                     to a keyframe. If AVSEEK_FLAG_BYTE is set, search by
- *                     position, not by timestamp.
- * @return -1 if no such sync point could be found, otherwise stream position
- *                     (stream is repositioned to this position)
- */
-int64_t ff_gen_syncpoint_search(AVFormatContext *s,
-                                int stream_index,
-                                int64_t pos,
-                                int64_t min_ts,
-                                int64_t ts,
-                                int64_t max_ts,
-                                int flags);
-
-/**
- * Store current parser state and file position.
- *
- * This function can be used by demuxers before a destructive seeking algorithm
- * to store the parser state. Depending on the outcome of the seek, either the original
- * state can be restored or the new state kept and the original state freed.
- *
- * @note As a side effect, the original parser state is reset, since structures
- *       are relinked to the stored state instead of being deeply-copied (for
- *       performance reasons and to keep the code simple).
- *
- * @param s context from which to save state
- * @return parser state object or NULL if memory could not be allocated
- */
-AVParserState *ff_store_parser_state(AVFormatContext *s);
-
-/**
- * Restore previously saved parser state and file position.
- *
- * Saved state will be invalidated and freed by this call, since internal
- * structures will be relinked back to the stored state instead of being
- * deeply-copied.
- *
- * @param s     context to which to restore state (same as used for storing state)
- * @param state state to restore
- */
-void ff_restore_parser_state(AVFormatContext *s, AVParserState *state);
-
-/**
- * Free previously saved parser state.
- *
- * @param s     context to which the state belongs (same as used for storing state)
- * @param state state to free
- */
-void ff_free_parser_state(AVFormatContext *s, AVParserState *state);
-
-#endif /* AVFORMAT_SEEK_H */