1 files changed, 90 insertions, 0 deletions
diff --git a/video/hwdec.c b/video/hwdec.c
new file mode 100644
index 0000000000..6db8d57869
--- /dev/null
+++ b/video/hwdec.c
@@ -0,0 +1,90 @@
+#include <pthread.h>
+#include <assert.h>
+
+#include "hwdec.h"
+
+struct mp_hwdec_devices {
+    pthread_mutex_t lock;
+
+    struct mp_hwdec_ctx *hwctx;
+
+    void (*load_api)(void *ctx, enum hwdec_type type);
+    void *load_api_ctx;
+};
+
+struct mp_hwdec_devices *hwdec_devices_create(void)
+{
+    struct mp_hwdec_devices *devs = talloc_zero(NULL, struct mp_hwdec_devices);
+    pthread_mutex_init(&devs->lock, NULL);
+    return devs;
+}
+
+void hwdec_devices_destroy(struct mp_hwdec_devices *devs)
+{
+    if (!devs)
+        return;
+    assert(!devs->hwctx); // must have been hwdec_devices_remove()ed
+    assert(!devs->load_api); // must have been unset
+    pthread_mutex_destroy(&devs->lock);
+    talloc_free(devs);
+}
+
+struct mp_hwdec_ctx *hwdec_devices_get(struct mp_hwdec_devices *devs,
+                                       enum hwdec_type type)
+{
+    struct mp_hwdec_ctx *res = NULL;
+    pthread_mutex_lock(&devs->lock);
+    if (devs->hwctx && devs->hwctx->type == type)
+        res = devs->hwctx;
+    pthread_mutex_unlock(&devs->lock);
+    return res;
+}
+
+struct mp_hwdec_ctx *hwdec_devices_get_first(struct mp_hwdec_devices *devs)
+{
+    pthread_mutex_lock(&devs->lock);
+    struct mp_hwdec_ctx *res = devs->hwctx;
+    pthread_mutex_unlock(&devs->lock);
+    return res;
+}
+
+void hwdec_devices_add(struct mp_hwdec_devices *devs, struct mp_hwdec_ctx *ctx)
+{
+    pthread_mutex_lock(&devs->lock);
+    // We support only 1 device; ignore the rest.
+    if (!devs->hwctx)
+        devs->hwctx = ctx;
+    pthread_mutex_unlock(&devs->lock);
+}
+
+void hwdec_devices_remove(struct mp_hwdec_devices *devs, struct mp_hwdec_ctx *ctx)
+{
+    pthread_mutex_lock(&devs->lock);
+    if (devs->hwctx == ctx)
+        devs->hwctx = NULL;
+    pthread_mutex_unlock(&devs->lock);
+}
+
+void hwdec_devices_set_loader(struct mp_hwdec_devices *devs,
+    void (*load_api)(void *ctx, enum hwdec_type type), void *load_api_ctx)
+{
+    devs->load_api = load_api;
+    devs->load_api_ctx = load_api_ctx;
+}
+
+// Cause VO to lazily load the requested device, and will block until this is
+// done (even if not available).
+void hwdec_devices_request(struct mp_hwdec_devices *devs, enum hwdec_type type)
+{
+    if (devs->load_api && !hwdec_devices_get_first(devs))
+        devs->load_api(devs->load_api_ctx, type);
+}
+
+void *hwdec_devices_load(struct mp_hwdec_devices *devs, enum hwdec_type type)
+{
+    if (!devs)
+        return NULL;
+    hwdec_devices_request(devs, type);
+    struct mp_hwdec_ctx *hwctx = hwdec_devices_get(devs, type);
+    return hwctx ? hwctx->ctx : NULL;
+}