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Code Issues Releases Activity

avformat/cache: remember EOF point if hit and use it to handle SEEK_END

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-12-25 21:27:04 +01:00
parent 0c0168a210
commit 681559d3ff
1 changed files with 10 additions and 0 deletions
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10
libavformat/cache.c
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@ -57,6 +57,7 @@ typedef struct Context {
int64_t cache_pos;
int64_t inner_pos;
int64_t end;
int is_true_eof;
URLContext *inner;
int64_t cache_hit, cache_miss;
} Context;
@ -174,6 +175,10 @@ static int cache_read(URLContext *h, unsigned char *buf, int size)
}
r = ffurl_read(c->inner, buf, size);
if (r == 0 && size>0) {
c->is_true_eof = 1;
av_assert0(c->end >= c->logical_pos);
}
if (r<=0)
return r;
c->inner_pos += r;
@ -198,6 +203,8 @@ static int64_t cache_seek(URLContext *h, int64_t pos, int whence)
if (ffurl_seek(c->inner, c->inner_pos, SEEK_SET) < 0)
av_log(h, AV_LOG_ERROR, "Inner protocol failed to seekback\n");
}
if (pos > 0)
c->is_true_eof = 1;
c->end = FFMAX(c->end, pos);
return pos;
}
@ -205,6 +212,9 @@ static int64_t cache_seek(URLContext *h, int64_t pos, int whence)
if (whence == SEEK_CUR) {
whence = SEEK_SET;
pos += c->logical_pos;
} else if (whence == SEEK_END && c->is_true_eof) {
whence = SEEK_SET;
pos += c->end;
}
if (whence == SEEK_SET && pos >= 0 && pos < c->end) {