On 2025-04-21 11:59 pm, Stefano Sabatini wrote:
On date Tuesday 2025-04-15 16:09:56 +0530, Gyan Doshi wrote:
Utility function to report seekability features for a given input.
Useful for ffprobe and to extend seek possibilities in fftools.
---
v2:
made constants more descriptive
add exception for rtsp false negative seekability
doc/APIchanges | 3 +++
libavformat/avformat.h | 22 ++++++++++++++++++
libavformat/seek.c | 53 ++++++++++++++++++++++++++++++++++++++++++
libavformat/version.h | 2 +-
4 files changed, 79 insertions(+), 1 deletion(-)
diff --git a/doc/APIchanges b/doc/APIchanges
index 65bf5a9419..879f56b572 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -2,6 +2,9 @@ The last version increases of all libraries were on 2025-03-28
API changes, most recent first:
+2025-04-xx - xxxxxxxxxx - lavf 62.1.100 - avformat.h
+ Add avformat_query_seekable().
+
2025-04-07 - 19e9a203b7 - lavu 60.01.100 - dict.h
Add AV_DICT_DEDUP.
diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index 498c3020a5..f9da5e9e79 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -2338,6 +2338,28 @@ int av_seek_frame(AVFormatContext *s, int stream_index,
int64_t timestamp,
*/
int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts,
int64_t ts, int64_t max_ts, int flags);
+#define AVSEEKABLE_IO_NORMAL 0x00000001 ///< I/O is seekable like a local file
+#define AVSEEKABLE_IO_PROTOCOL 0x00000002 ///< I/O seek is through
protocol request via avio_seek_time
+#define AVSEEKABLE_VIA_DEMUXER 0x00000004 ///< demuxer has a seek function
+#define AVSEEKABLE_VIA_PKTSCAN 0x00000008 ///< seek is performed by
consuming and scanning packet timestamps
+#define AVSEEKABLE_BY_TIME 0x00000100 ///< seek target can be a
timestamp
+#define AVSEEKABLE_BY_BYTE 0x00000200 ///< seek target can be in bytes
+#define AVSEEKABLE_BY_FRAME 0x00000400 ///< seek target can be a frame
index
+#define AVSEEKABLE_PROP_PTS 0x00010000 ///< seek target timestamp is
expected to be PTS
+#define AVSEEKABLE_PROP_FAST 0x00020000 ///< demuxer allows fast but
inaccurate seeking
+#define AVSEEKABLE_PROP_FWDONLY 0x00040000 ///< set seek will be equal or
forward of specified seek point
Not sure I get this, can you clarify/expand?
The framework does not seek to an earlier KF, e.g. if either avio is not
AVIO_SEEKABLE_NORMAL or the index does not correctly mark keyframes.
then a seek to 12s will return frames from 12s and decoding will start
from next KF encountered.
I see now that my test for this can produce false postives. I'll try to
fix it.
+/**
+ * Report if and how a seek can be performed in a given input.
I don't like the "can be performed in a given input" part, I'd use a
terminology closer to the function name: "for this format context".
Also, probably we want to specify that the method should be used after
the open operation or whatever.
Will do.
Regards,
Gyan
_______________________________________________
ffmpeg-devel mailing list
ffmpeg-devel@ffmpeg.org
https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
To unsubscribe, visit link above, or email
ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
