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img2enc: Make sure the images are atomically written 

Users that want to generate a live-preview and serve it
would otherwise get partial images.
This commit is contained in:
Luca Barbato 2015-10-20 19:49:13 +02:00
parent 1ec72c6c68
commit 22f4d9c303
1 changed files with 5 additions and 2 deletions
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7
libavformat/img2enc.c
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@ -33,6 +33,7 @@ typedef struct VideoMuxData {
int img_number;
int is_pipe;
char path[1024];
char tmp[1024];
int update;
} VideoMuxData;
@ -41,6 +42,7 @@ static int write_header(AVFormatContext *s)
VideoMuxData *img = s->priv_data;
av_strlcpy(img->path, s->filename, sizeof(img->path));
snprintf(img->tmp, sizeof(img->tmp), "%s.tmp", s->filename);
/* find format */
if (s->oformat->flags & AVFMT_NOFILE)
@ -70,9 +72,9 @@ static int write_packet(AVFormatContext *s, AVPacket *pkt)
return AVERROR(EIO);
}
for (i = 0; i < 3; i++) {
if (avio_open2(&pb[i], filename, AVIO_FLAG_WRITE,
if (avio_open2(&pb[i], img->tmp, AVIO_FLAG_WRITE,
&s->interrupt_callback, NULL) < 0) {
av_log(s, AV_LOG_ERROR, "Could not open file : %s\n", filename);
av_log(s, AV_LOG_ERROR, "Could not open file : %s\n", img->tmp);
return AVERROR(EIO);
}
@ -121,6 +123,7 @@ error:
avio_flush(pb[0]);
if (!img->is_pipe) {
avio_close(pb[0]);
ff_rename(img->tmp, filename);
}
img->img_number++;