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|helper structure describing keyframe search state of one stream More...|
|static int64_t||ts_distance (int64_t ts_hi, AVRational tb_hi, int64_t ts_lo, AVRational tb_lo)|
|Compute a distance between timestamps. |
|static void||search_hi_lo_keyframes (AVFormatContext *s, int64_t timestamp, AVRational timebase, int flags, AVSyncPoint *sync, int keyframes_to_find, int *found_lo, int *found_hi, int first_iter)|
|Partial search for keyframes in multiple streams. |
|int64_t||ff_gen_syncpoint_search (AVFormatContext *s, int stream_index, int64_t pos, int64_t ts_min, int64_t ts, int64_t ts_max, int flags)|
|Search for the sync point of all active streams. |
|AVParserState *||ff_store_parser_state (AVFormatContext *s)|
|Store current parser state and file position. |
|void||ff_restore_parser_state (AVFormatContext *s, AVParserState *state)|
|Restore previously saved parser state and file position. |
|static void||free_packet_list (AVPacketList *pktl)|
|void||ff_free_parser_state (AVFormatContext *s, AVParserState *state)|
|Free previously saved parser state. |
|void ff_free_parser_state||(||AVFormatContext *||s,|
|int64_t ff_gen_syncpoint_search||(||AVFormatContext *||s,|
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.
|stream_index||stream index for time base reference of timestamps|
|pos||approximate position where to start searching for key frames|
|min_ts||minimum allowed timestamp (position, if AVSEEK_FLAG_BYTE set)|
|ts||target timestamp (or position, if AVSEEK_FLAG_BYTE set in flags)|
|max_ts||maximum allowed timestamp (position, if AVSEEK_FLAG_BYTE set)|
|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.|
|void ff_restore_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.
|s||context to which to restore state (same as used for storing state)|
|state||state to restore|
|AVParserState* ff_store_parser_state||(||AVFormatContext *||s||)|
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.
|s||context from which to save state|
|static void free_packet_list||(||AVPacketList *||pktl||)||
Definition at line 487 of file seek.c.
Referenced by ff_free_parser_state().
|static void search_hi_lo_keyframes||(||AVFormatContext *||s,|
Partial search for keyframes in multiple streams.
This routine searches in each stream for the next lower and the next higher timestamp compared to the given target timestamp. The search starts at the current file position and ends at the file position, where all streams have already been examined (or when all higher key frames are found in the first iteration).
This routine is called iteratively with an exponential backoff to find the lower timestamp.
|timestamp||target timestamp (or position, if AVSEEK_FLAG_BYTE)|
|timebase||time base for timestamps|
|sync||array with information per stream|
|keyframes_to_find||count of keyframes to find in total|
|found_lo||ptr to the count of already found low timestamp keyframes|
|found_hi||ptr to the count of already found high timestamp keyframes|
|first_iter||flag for first iteration|
Definition at line 97 of file seek.c.
Referenced by ff_gen_syncpoint_search().
|static int64_t ts_distance||(||int64_t||ts_hi,|
Compute a distance between timestamps.
Distances are only comparable, if same time bases are used for computing distances.
|tb_hi||high timestamp time base|
|tb_lo||low timestamp time base|
Definition at line 63 of file seek.c.
Referenced by ff_gen_syncpoint_search().