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, 154 deletions

diff --git a/thirdparty/libsimplewebm/VPXDecoder.cpp b/thirdparty/libsimplewebm/VPXDecoder.cpp
deleted file mode 100644
index e2606f83ba..0000000000
--- a/thirdparty/libsimplewebm/VPXDecoder.cpp
+++ /dev/null
@@ -1,154 +0,0 @@
-/*
-	MIT License
-
-	Copyright (c) 2016 Błażej Szczygieł
-
-	Permission is hereby granted, free of charge, to any person obtaining a copy
-	of this software and associated documentation files (the "Software"), to deal
-	in the Software without restriction, including without limitation the rights
-	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-	copies of the Software, and to permit persons to whom the Software is
-	furnished to do so, subject to the following conditions:
-
-	The above copyright notice and this permission notice shall be included in all
-	copies or substantial portions of the Software.
-
-	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-	SOFTWARE.
-*/
-
-#include "VPXDecoder.hpp"
-
-#include <vpx/vpx_decoder.h>
-#include <vpx/vp8dx.h>
-
-#include <stdlib.h>
-#include <string.h>
-
-VPXDecoder::VPXDecoder(const WebMDemuxer &demuxer, unsigned threads) :
-	m_ctx(NULL),
-	m_iter(NULL),
-	m_delay(0),
-	m_last_space(VPX_CS_UNKNOWN)
-{
-	if (threads > 8)
-		threads = 8;
-	else if (threads < 1)
-		threads = 1;
-
-	const vpx_codec_dec_cfg_t codecCfg = {
-		threads,
-		0,
-		0
-	};
-	vpx_codec_iface_t *codecIface = NULL;
-
-	switch (demuxer.getVideoCodec())
-	{
-		case WebMDemuxer::VIDEO_VP8:
-			codecIface = vpx_codec_vp8_dx();
-			break;
-		case WebMDemuxer::VIDEO_VP9:
-			codecIface = vpx_codec_vp9_dx();
-			m_delay = threads - 1;
-			break;
-		default:
-			return;
-	}
-
-	m_ctx = new vpx_codec_ctx_t;
-	if (vpx_codec_dec_init(m_ctx, codecIface, &codecCfg, m_delay > 0 ? VPX_CODEC_USE_FRAME_THREADING : 0))
-	{
-		delete m_ctx;
-		m_ctx = NULL;
-	}
-}
-VPXDecoder::~VPXDecoder()
-{
-	if (m_ctx)
-	{
-		vpx_codec_destroy(m_ctx);
-		delete m_ctx;
-	}
-}
-
-bool VPXDecoder::decode(const WebMFrame &frame)
-{
-	m_iter = NULL;
-	return !vpx_codec_decode(m_ctx, frame.buffer, frame.bufferSize, NULL, 0);
-}
-VPXDecoder::IMAGE_ERROR VPXDecoder::getImage(Image &image)
-{
-	IMAGE_ERROR err = NO_FRAME;
-	if (vpx_image_t *img = vpx_codec_get_frame(m_ctx, &m_iter))
-	{
-		// It seems to be a common problem that UNKNOWN comes up a lot, yet FFMPEG is somehow getting accurate colour-space information.
-		// After checking FFMPEG code, *they're* getting colour-space information, so I'm assuming something like this is going on.
-		// It appears to work, at least.
-		if (img->cs != VPX_CS_UNKNOWN)
-			m_last_space = img->cs;
-		if ((img->fmt & VPX_IMG_FMT_PLANAR) && !(img->fmt & (VPX_IMG_FMT_HAS_ALPHA | VPX_IMG_FMT_HIGHBITDEPTH)))
-		{
-			if (img->stride[0] && img->stride[1] && img->stride[2])
-			{
-				const int uPlane = !!(img->fmt & VPX_IMG_FMT_UV_FLIP) + 1;
-				const int vPlane =  !(img->fmt & VPX_IMG_FMT_UV_FLIP) + 1;
-
-				image.w = img->d_w;
-				image.h = img->d_h;
-				image.cs = m_last_space;
-				image.chromaShiftW = img->x_chroma_shift;
-				image.chromaShiftH = img->y_chroma_shift;
-
-				image.planes[0] = img->planes[0];
-				image.planes[1] = img->planes[uPlane];
-				image.planes[2] = img->planes[vPlane];
-
-				image.linesize[0] = img->stride[0];
-				image.linesize[1] = img->stride[uPlane];
-				image.linesize[2] = img->stride[vPlane];
-
-				err = NO_ERROR;
-			}
-		}
-		else
-		{
-			err = UNSUPPORTED_FRAME;
-		}
-	}
-	return err;
-}
-
-/**/
-
-// -- GODOT begin --
-#if 0
-// -- GODOT end --
-
-static inline int ceilRshift(int val, int shift)
-{
-	return (val + (1 << shift) - 1) >> shift;
-}
-
-int VPXDecoder::Image::getWidth(int plane) const
-{
-	if (!plane)
-		return w;
-	return ceilRshift(w, chromaShiftW);
-}
-int VPXDecoder::Image::getHeight(int plane) const
-{
-	if (!plane)
-		return h;
-	return ceilRshift(h, chromaShiftH);
-}
-
-// -- GODOT begin --
-#endif
-// -- GODOT end --
-