[FFmpeg-devel] [PATCH] avformat/cache - delete cache file after closing handle
Gyan
ffmpeg at gyani.pro
Fri May 24 08:54:45 EEST 2019
On 24-05-2019 02:06 AM, Hendrik Leppkes wrote:
> On Thu, May 23, 2019 at 9:55 PM Gyan <ffmpeg at gyani.pro> wrote:
>>
>>
>> On 24-05-2019 12:58 AM, Nicolas George wrote:
>>> Gyan (12019-05-24):
>>>> avpriv_io_delete will call the file protocol's delete which is guarded
>>>> with a header check, not done here.
>>> Do you have report of a build failure caused by unlink()?
>> No. I assume that the guard in the file proto callback is germane and
>> the patch was subject to review. Do you know it isn't?
>>
>>>> Since we now have a generic wrapper function, isn't that better for
>>>> future maintenance?
>>> Not that I see. Something that makes it harder to follow the code from
>>> the call site to the actual function is not good for maintenance.
>> The point of modularizing the op here is to have a single interface -
>> why stick with a direct external call? At the time it was added, there
>> was no alternative.
>> Don't mind it either way, but this feels like a useless game of ping-pong.
>>
> Just stick to unlink. If there is no reason to change it, then the
> preference is to just keep it as-is.
> We're not using the file protocol to create the file, so no reason to
> use it to delete it.
Revised.
Gyan
-------------- next part --------------
From ce3f3853af36b6a601e013da0257d8e7b34b7ede Mon Sep 17 00:00:00 2001
From: Gyan Doshi <ffmpeg at gyani.pro>
Date: Wed, 22 May 2019 18:05:04 +0530
Subject: [PATCH v4] avformat/cache - delete cache file after closing handle
Verified that cache files get deleted on Windows.
---
libavformat/cache.c | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/libavformat/cache.c b/libavformat/cache.c
index 66bbbf54c9..3425be9350 100644
--- a/libavformat/cache.c
+++ b/libavformat/cache.c
@@ -54,6 +54,7 @@ typedef struct CacheEntry {
typedef struct Context {
AVClass *class;
int fd;
+ char *filename;
struct AVTreeNode *root;
int64_t logical_pos;
int64_t cache_pos;
@@ -72,6 +73,7 @@ static int cmp(const void *key, const void *node)
static int cache_open(URLContext *h, const char *arg, int flags, AVDictionary **options)
{
+ int ret;
char *buffername;
Context *c= h->priv_data;
@@ -83,8 +85,12 @@ static int cache_open(URLContext *h, const char *arg, int flags, AVDictionary **
return c->fd;
}
- unlink(buffername);
- av_freep(&buffername);
+ ret = unlink(buffername);
+
+ if (ret >= 0)
+ av_freep(&buffername);
+ else
+ c->filename = buffername;
return ffurl_open_whitelist(&c->inner, arg, flags, &h->interrupt_callback,
options, h->protocol_whitelist, h->protocol_blacklist, h);
@@ -292,11 +298,18 @@ static int enu_free(void *opaque, void *elem)
static int cache_close(URLContext *h)
{
Context *c= h->priv_data;
+ int ret;
av_log(h, AV_LOG_INFO, "Statistics, cache hits:%"PRId64" cache misses:%"PRId64"\n",
c->cache_hit, c->cache_miss);
close(c->fd);
+ if (c->filename) {
+ ret = unlink(c->filename);
+ if (ret < 0)
+ av_log(h, AV_LOG_ERROR, "Could not delete %s.\n", c->filename);
+ av_freep(&c->filename);
+ }
ffurl_close(c->inner);
av_tree_enumerate(c->root, NULL, NULL, enu_free);
av_tree_destroy(c->root);
--
2.21.0
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