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int64_t ff_gen_syncpoint_search |
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AVFormatContext * |
s, |
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int |
stream_index, |
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int64_t |
pos, |
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int64_t |
min_ts, |
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int64_t |
ts, |
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int64_t |
max_ts, |
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int |
flags |
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) |
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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.
- Parameters
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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. |
- Returns
- -1 if no such sync point could be found, otherwise stream position (stream is repositioned to this position)
Definition at line 244 of file seek.c.
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).
- Parameters
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s | context from which to save state |
- Returns
- parser state object or NULL if memory could not be allocated
Definition at line 394 of file seek.c.
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.
- Parameters
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s | context to which to restore state (same as used for storing state) |
state | state to restore |
Definition at line 444 of file seek.c.
Free previously saved parser state.
- Parameters
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s | context to which the state belongs (same as used for storing state) |
state | state to free |
Definition at line 489 of file seek.c.