Adds support for FFmpeg and later

Obtained from:

https://github.com/archlinux/svntogit-packages/blob/packages/qt5-webengine/trunk/qt5-webengine-ffmpeg5.patch

--- src/3rdparty/chromium/media/ffmpeg/ffmpeg_common.h.orig	2021-12-15 16:12:54 UTC
+++ src/3rdparty/chromium/media/ffmpeg/ffmpeg_common.h
@@ -29,6 +29,7 @@ extern "C" {
 #include <libavformat/avformat.h>
 #include <libavformat/avio.h>
 #include <libavutil/avutil.h>
+#include <libavutil/channel_layout.h>
 #include <libavutil/imgutils.h>
 #include <libavutil/log.h>
 #include <libavutil/mastering_display_metadata.h>
--- src/3rdparty/chromium/media/filters/audio_file_reader.cc.orig	2021-12-15 16:12:54 UTC
+++ src/3rdparty/chromium/media/filters/audio_file_reader.cc
@@ -85,7 +85,7 @@ bool AudioFileReader::OpenDecoder() {
 }
 
 bool AudioFileReader::OpenDecoder() {
-  AVCodec* codec = avcodec_find_decoder(codec_context_->codec_id);
+  const AVCodec* codec = avcodec_find_decoder(codec_context_->codec_id);
   if (codec) {
     // MP3 decodes to S16P which we don't support, tell it to use S16 instead.
     if (codec_context_->sample_fmt == AV_SAMPLE_FMT_S16P)
--- src/3rdparty/chromium/media/filters/ffmpeg_audio_decoder.cc.orig	2021-12-15 16:12:54 UTC
+++ src/3rdparty/chromium/media/filters/ffmpeg_audio_decoder.cc
@@ -329,7 +329,7 @@ bool FFmpegAudioDecoder::ConfigureDecoder(const AudioD
     }
   }
 
-  AVCodec* codec = avcodec_find_decoder(codec_context_->codec_id);
+  const AVCodec* codec = avcodec_find_decoder(codec_context_->codec_id);
   if (!codec ||
       avcodec_open2(codec_context_.get(), codec, &codec_options) < 0) {
     DLOG(ERROR) << "Could not initialize audio decoder: "
--- src/3rdparty/chromium/media/filters/ffmpeg_demuxer.cc.orig	2021-12-15 16:12:54 UTC
+++ src/3rdparty/chromium/media/filters/ffmpeg_demuxer.cc
@@ -98,12 +98,12 @@ static base::TimeDelta ExtractStartTime(AVStream* stre
 
   // Next try to use the first DTS value, for codecs where we know PTS == DTS
   // (excludes all H26x codecs). The start time must be returned in PTS.
-  if (stream->first_dts != kNoFFmpegTimestamp &&
+  if (av_stream_get_first_dts(stream) != kNoFFmpegTimestamp &&
       stream->codecpar->codec_id != AV_CODEC_ID_HEVC &&
       stream->codecpar->codec_id != AV_CODEC_ID_H264 &&
       stream->codecpar->codec_id != AV_CODEC_ID_MPEG4) {
     const base::TimeDelta first_pts =
-        ConvertFromTimeBase(stream->time_base, stream->first_dts);
+        ConvertFromTimeBase(stream->time_base, av_stream_get_first_dts(stream));
     if (first_pts < start_time)
       start_time = first_pts;
   }
@@ -408,11 +408,11 @@ void FFmpegDemuxerStream::EnqueuePacket(ScopedAVPacket
   scoped_refptr<DecoderBuffer> buffer;
 
   if (type() == DemuxerStream::TEXT) {
-    int id_size = 0;
+    size_t id_size = 0;
     uint8_t* id_data = av_packet_get_side_data(
         packet.get(), AV_PKT_DATA_WEBVTT_IDENTIFIER, &id_size);
 
-    int settings_size = 0;
+    size_t settings_size = 0;
     uint8_t* settings_data = av_packet_get_side_data(
         packet.get(), AV_PKT_DATA_WEBVTT_SETTINGS, &settings_size);
 
@@ -424,7 +424,7 @@ void FFmpegDemuxerStream::EnqueuePacket(ScopedAVPacket
     buffer = DecoderBuffer::CopyFrom(packet->data, packet->size,
                                      side_data.data(), side_data.size());
   } else {
-    int side_data_size = 0;
+    size_t side_data_size = 0;
     uint8_t* side_data = av_packet_get_side_data(
         packet.get(), AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL, &side_data_size);
 
@@ -485,7 +485,7 @@ void FFmpegDemuxerStream::EnqueuePacket(ScopedAVPacket
                                        packet->size - data_offset);
     }
 
-    int skip_samples_size = 0;
+    size_t skip_samples_size = 0;
     const uint32_t* skip_samples_ptr =
         reinterpret_cast<const uint32_t*>(av_packet_get_side_data(
             packet.get(), AV_PKT_DATA_SKIP_SAMPLES, &skip_samples_size));
--- src/3rdparty/chromium/media/filters/ffmpeg_glue.cc.orig	2021-12-15 16:12:54 UTC
+++ src/3rdparty/chromium/media/filters/ffmpeg_glue.cc
@@ -59,7 +59,6 @@ void FFmpegGlue::InitializeFFmpeg() {
 }
 
 void FFmpegGlue::InitializeFFmpeg() {
-  av_register_all();
 }
 
 static void LogContainer(bool is_local_file,
@@ -94,9 +93,6 @@ FFmpegGlue::FFmpegGlue(FFmpegURLProtocol* protocol) {
 
   // Enable fast, but inaccurate seeks for MP3.
   format_context_->flags |= AVFMT_FLAG_FAST_SEEK;
-
-  // Ensures we can read out various metadata bits like vp8 alpha.
-  format_context_->flags |= AVFMT_FLAG_KEEP_SIDE_DATA;
 
   // Ensures format parsing errors will bail out. From an audit on 11/2017, all
   // instances were real failures. Solves bugs like http://crbug.com/710791.
--- src/3rdparty/chromium/media/filters/ffmpeg_video_decoder.cc.orig	2021-12-15 16:12:54 UTC
+++ src/3rdparty/chromium/media/filters/ffmpeg_video_decoder.cc
@@ -391,7 +391,7 @@ bool FFmpegVideoDecoder::ConfigureDecoder(const VideoD
   if (decode_nalus_)
     codec_context_->flags2 |= AV_CODEC_FLAG2_CHUNKS;
 
-  AVCodec* codec = avcodec_find_decoder(codec_context_->codec_id);
+  const AVCodec* codec = avcodec_find_decoder(codec_context_->codec_id);
   if (!codec || avcodec_open2(codec_context_.get(), codec, NULL) < 0) {
     ReleaseFFmpegResources();
     return false;
--- src/3rdparty/chromium/media/filters/media_file_checker.cc.orig	2021-12-15 16:12:54 UTC
+++ src/3rdparty/chromium/media/filters/media_file_checker.cc
@@ -68,7 +68,7 @@ bool MediaFileChecker::Start(base::TimeDelta check_tim
       auto context = AVStreamToAVCodecContext(format_context->streams[i]);
       if (!context)
         continue;
-      AVCodec* codec = avcodec_find_decoder(cp->codec_id);
+      const AVCodec* codec = avcodec_find_decoder(cp->codec_id);
       if (codec && avcodec_open2(context.get(), codec, nullptr) >= 0) {
         auto loop = std::make_unique<FFmpegDecodingLoop>(context.get());
         stream_contexts[i] = {std::move(context), std::move(loop)};
--- src/3rdparty/chromium/third_party/webrtc/modules/video_coding/codecs/h264/h264_decoder_impl.cc.orig	2021-12-15 16:12:54 UTC
+++ src/3rdparty/chromium/third_party/webrtc/modules/video_coding/codecs/h264/h264_decoder_impl.cc
@@ -203,7 +203,7 @@ int32_t H264DecoderImpl::InitDecode(const VideoCodec* 
   // a pointer |this|.
   av_context_->opaque = this;
 
-  AVCodec* codec = avcodec_find_decoder(av_context_->codec_id);
+  const AVCodec* codec = avcodec_find_decoder(av_context_->codec_id);
   if (!codec) {
     // This is an indication that FFmpeg has not been initialized or it has not
     // been compiled/initialized with the correct set of codecs.