- return hwaccel ? hwaccel->next : first_hwaccel;
-}
-
-int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op))
-{
- if (lockmgr_cb) {
- // 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;
- }
-
- return 0;
-}
-
-int ff_lock_avcodec(AVCodecContext *log_ctx, const AVCodec *codec)
-{
- if (codec->caps_internal & FF_CODEC_CAP_INIT_THREADSAFE || !codec->init)
- return 0;
-
- if (lockmgr_cb) {
- if ((*lockmgr_cb)(&codec_mutex, AV_LOCK_OBTAIN))
- return -1;
- }
-
- if (avpriv_atomic_int_add_and_fetch(&entangled_thread_counter, 1) != 1) {
- av_log(log_ctx, AV_LOG_ERROR,
- "Insufficient thread locking. At least %d threads are "
- "calling avcodec_open2() at the same time right now.\n",
- entangled_thread_counter);
- if (!lockmgr_cb)
- av_log(log_ctx, AV_LOG_ERROR, "No lock manager is set, please see av_lockmgr_register()\n");
- ff_avcodec_locked = 1;
- ff_unlock_avcodec(codec);
- return AVERROR(EINVAL);
- }
- av_assert0(!ff_avcodec_locked);
- ff_avcodec_locked = 1;
- return 0;
-}
-
-int ff_unlock_avcodec(const AVCodec *codec)
-{
- if (codec->caps_internal & FF_CODEC_CAP_INIT_THREADSAFE || !codec->init)
- return 0;
-
- av_assert0(ff_avcodec_locked);
- ff_avcodec_locked = 0;
- avpriv_atomic_int_add_and_fetch(&entangled_thread_counter, -1);
- if (lockmgr_cb) {
- if ((*lockmgr_cb)(&codec_mutex, AV_LOCK_RELEASE))
- return -1;
- }
-
- return 0;