vo_opengl: add infrastructure for hardware decoding OpenGL interop

Most hardware decoding APIs provide some OpenGL interop. This allows
using vo_opengl, without having to read the video data back from GPU.

This requires adding a backend for each hardware decoding API. (Each
backend is an entry in gl_hwdec_vaglx[].) The backends expose video data
as a set of OpenGL textures.

Add infrastructure to support this. The next commit will add support for
VA-API.

1 files changed, 2 insertions, 0 deletions

diff --git a/video/decode/lavc.h b/video/decode/lavc.h
index 9e2533cbd5..af206bc82a 100644
--- a/video/decode/lavc.h
+++ b/video/decode/lavc.h
@@ -86,6 +86,8 @@ bool hwdec_check_codec_support(const char *decoder,
                                const struct hwdec_profile_entry *table);
 int hwdec_get_max_refs(struct lavc_ctx *ctx);
 
+void hwdec_request_api(struct mp_hwdec_info *info, const char *api_name);
+
 // lavc_dr1.c
 int mp_codec_get_buffer(AVCodecContext *s, AVFrame *frame);
 void mp_codec_release_buffer(AVCodecContext *s, AVFrame *frame);