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avformat/subfile: allow to extract till EOF

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Users can set end offset as 0 to extract till end of file.
Tested locally and documented.
This commit is contained in:
Gyan Doshi 2017-11-15 17:36:19 +05:30 committed by Nicolas George
parent 4f4e19914d
commit e75fe0ef21
2 changed files with 9 additions and 0 deletions
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6
doc/protocols.texi
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@ -1186,6 +1186,7 @@ Accepted options:
Start offset of the extracted segment, in bytes. Start offset of the extracted segment, in bytes.
@item end @item end
End offset of the extracted segment, in bytes. End offset of the extracted segment, in bytes.
If set to 0, extract till end of file.
@end table @end table
Examples: Examples:
@ -1201,6 +1202,11 @@ Play an AVI file directly from a TAR archive:
subfile,,start,183241728,end,366490624,,:archive.tar subfile,,start,183241728,end,366490624,,:archive.tar
@end example @end example
Play a MPEG-TS file from start offset till end:
@example
subfile,,start,32815239,end,0,,:video.ts
@end example
@section tee @section tee
Writes the output to multiple protocols. The individual outputs are separated Writes the output to multiple protocols. The individual outputs are separated

3
libavformat/subfile.c
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@ -72,6 +72,9 @@ static int subfile_open(URLContext *h, const char *filename, int flags,
SubfileContext *c = h->priv_data; SubfileContext *c = h->priv_data;
int ret; int ret;
if (!c->end)
c->end = INT64_MAX;
if (c->end <= c->start) { if (c->end <= c->start) {
av_log(h, AV_LOG_ERROR, "end before start\n"); av_log(h, AV_LOG_ERROR, "end before start\n");
return AVERROR(EINVAL); return AVERROR(EINVAL);