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lavf: Don't try to update files atomically with renames on windows

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On windows, rename(2) will fail if the target file exists. On
unix this trick is used to make sure that people reading the file
either will get the full previous file, or the full new version
of the file, but no intermediate version.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö
2014-11-18 14:06:19 +02:00
parent 40665d27e3
commit b9d08c77a4
4 changed files with 30 additions and 14 deletions
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16
libavformat/hdsenc.c
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@@ -163,6 +163,7 @@ static int write_manifest(AVFormatContext *s, int final)
HDSContext *c = s->priv_data;
AVIOContext *out;
char filename[1024], temp_filename[1024];
const char *write_filename;
int ret, i;
float duration = 0;
@@ -171,10 +172,11 @@ static int write_manifest(AVFormatContext *s, int final)
snprintf(filename, sizeof(filename), "%s/index.f4m", s->filename);
snprintf(temp_filename, sizeof(temp_filename), "%s/index.f4m.tmp", s->filename);
ret = avio_open2(&out, temp_filename, AVIO_FLAG_WRITE,
write_filename = USE_RENAME_REPLACE ? temp_filename : filename;
ret = avio_open2(&out, write_filename, AVIO_FLAG_WRITE,
&s->interrupt_callback, NULL);
if (ret < 0) {
av_log(s, AV_LOG_ERROR, "Unable to open %s for writing\n", temp_filename);
av_log(s, AV_LOG_ERROR, "Unable to open %s for writing\n", write_filename);
return ret;
}
avio_printf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
@@ -204,7 +206,7 @@ static int write_manifest(AVFormatContext *s, int final)
avio_printf(out, "</manifest>\n");
avio_flush(out);
avio_close(out);
return ff_rename(temp_filename, filename);
return USE_RENAME_REPLACE ? ff_rename(temp_filename, filename) : 0;
}
static void update_size(AVIOContext *out, int64_t pos)
@@ -223,6 +225,7 @@ static int write_abst(AVFormatContext *s, OutputStream *os, int final)
HDSContext *c = s->priv_data;
AVIOContext *out;
char filename[1024], temp_filename[1024];
const char *write_filename;
int i, ret;
int64_t asrt_pos, afrt_pos;
int start = 0, fragments;
@@ -240,10 +243,11 @@ static int write_abst(AVFormatContext *s, OutputStream *os, int final)
"%s/stream%d.abst", s->filename, index);
snprintf(temp_filename, sizeof(temp_filename),
"%s/stream%d.abst.tmp", s->filename, index);
ret = avio_open2(&out, temp_filename, AVIO_FLAG_WRITE,
write_filename = USE_RENAME_REPLACE ? temp_filename : filename;
ret = avio_open2(&out, write_filename, AVIO_FLAG_WRITE,
&s->interrupt_callback, NULL);
if (ret < 0) {
av_log(s, AV_LOG_ERROR, "Unable to open %s for writing\n", temp_filename);
av_log(s, AV_LOG_ERROR, "Unable to open %s for writing\n", write_filename);
return ret;
}
avio_wb32(out, 0); // abst size
@@ -285,7 +289,7 @@ static int write_abst(AVFormatContext *s, OutputStream *os, int final)
update_size(out, afrt_pos);
update_size(out, 0);
avio_close(out);
return ff_rename(temp_filename, filename);
return USE_RENAME_REPLACE ? ff_rename(temp_filename, filename) : 0;
}
static int init_file(AVFormatContext *s, OutputStream *os, int64_t start_ts)