- if (lockmgr_cb(&codec_mutex, AV_LOCK_DESTROY))
- return -1;
- if (lockmgr_cb(&avformat_mutex, AV_LOCK_DESTROY))
- return -1;
+ // There is no good way to rollback a failure to destroy the
+ // mutex, so we ignore failures.
+ lockmgr_cb(&codec_mutex, AV_LOCK_DESTROY);
+ lockmgr_cb(&avformat_mutex, AV_LOCK_DESTROY);
+ lockmgr_cb = NULL;
+ codec_mutex = NULL;
+ avformat_mutex = NULL;
+ }
+
+ if (cb) {
+ void *new_codec_mutex = NULL;
+ void *new_avformat_mutex = NULL;
+ int err;
+ if (err = cb(&new_codec_mutex, AV_LOCK_CREATE)) {
+ return err > 0 ? AVERROR_UNKNOWN : err;
+ }
+ if (err = cb(&new_avformat_mutex, AV_LOCK_CREATE)) {
+ // Ignore failures to destroy the newly created mutex.
+ cb(&new_codec_mutex, AV_LOCK_DESTROY);
+ return err > 0 ? AVERROR_UNKNOWN : err;
+ }
+ lockmgr_cb = cb;
+ codec_mutex = new_codec_mutex;
+ avformat_mutex = new_avformat_mutex;