Remove WebM support (and deps libvpx and opus)

We've had many issues with WebM support and specifically the libvpx library
over the years, mostly due to its poor integration in Godot's buildsystem,
but without anyone really interested in improving this state.

With the new GDExtensions in Godot 4.0, we intend to move video decoding to
first-party extensions, and this would likely be done using something like
libvlc to expose more codecs.

Removing the `webm` module means we can remove libsimplewebm, libvpx and
opus, which we were only used for that purpose. Both libvpx and opus were
fairly complex pieces of the buildsystem, so this is a nice cleanup.

This also removes the compile-time dependency on `yasm`.

Fixes lots of compilation or non-working WebM issues which will be linked
in the PR.

1 files changed, 0 insertions, 98 deletions

diff --git a/thirdparty/libvpx/vp8/common/treecoder.h b/thirdparty/libvpx/vp8/common/treecoder.h
deleted file mode 100644
index d22b7c570c..0000000000
--- a/thirdparty/libvpx/vp8/common/treecoder.h
+++ /dev/null
@@ -1,98 +0,0 @@
-/*
- *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-
-#ifndef VP8_COMMON_TREECODER_H_
-#define VP8_COMMON_TREECODER_H_
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-typedef unsigned char vp8bc_index_t; /* probability index */
-
-
-typedef unsigned char vp8_prob;
-
-#define vp8_prob_half ( (vp8_prob) 128)
-
-typedef signed char vp8_tree_index;
-struct bool_coder_spec;
-
-typedef struct bool_coder_spec bool_coder_spec;
-typedef struct bool_writer bool_writer;
-typedef struct bool_reader bool_reader;
-
-typedef const bool_coder_spec c_bool_coder_spec;
-typedef const bool_writer c_bool_writer;
-typedef const bool_reader c_bool_reader;
-
-
-
-# define vp8_complement( x) (255 - x)
-
-
-/* We build coding trees compactly in arrays.
-   Each node of the tree is a pair of vp8_tree_indices.
-   Array index often references a corresponding probability table.
-   Index <= 0 means done encoding/decoding and value = -Index,
-   Index > 0 means need another bit, specification at index.
-   Nonnegative indices are always even;  processing begins at node 0. */
-
-typedef const vp8_tree_index vp8_tree[], *vp8_tree_p;
-
-
-typedef const struct vp8_token_struct
-{
-    int value;
-    int Len;
-} vp8_token;
-
-/* Construct encoding array from tree. */
-
-void vp8_tokens_from_tree(struct vp8_token_struct *, vp8_tree);
-void vp8_tokens_from_tree_offset(struct vp8_token_struct *, vp8_tree,
-                                 int offset);
-
-
-/* Convert array of token occurrence counts into a table of probabilities
-   for the associated binary encoding tree.  Also writes count of branches
-   taken for each node on the tree; this facilitiates decisions as to
-   probability updates. */
-
-void vp8_tree_probs_from_distribution(
-    int n,                      /* n = size of alphabet */
-    vp8_token tok               [ /* n */ ],
-    vp8_tree tree,
-    vp8_prob probs          [ /* n-1 */ ],
-    unsigned int branch_ct       [ /* n-1 */ ] [2],
-    const unsigned int num_events[ /* n */ ],
-    unsigned int Pfactor,
-    int Round
-);
-
-/* Variant of above using coder spec rather than hardwired 8-bit probs. */
-
-void vp8bc_tree_probs_from_distribution(
-    int n,                      /* n = size of alphabet */
-    vp8_token tok               [ /* n */ ],
-    vp8_tree tree,
-    vp8_prob probs          [ /* n-1 */ ],
-    unsigned int branch_ct       [ /* n-1 */ ] [2],
-    const unsigned int num_events[ /* n */ ],
-    c_bool_coder_spec *s
-);
-
-
-#ifdef __cplusplus
-}  // extern "C"
-#endif
-
-#endif  // VP8_COMMON_TREECODER_H_