Bug 1766646 - Vendor libwebrtc from 41a111d5b9

Upstream commit: https://webrtc.googlesource.com/src/+/41a111d5b944d48fcb1fbdcbf08622624b5750f7
    Switch to av_packet_alloc()

    ffmpeg is going to be hiding the implementation of AVPacket, so we can't
    allocate them on the stack anymore. av_init_packet is marked deprecated
    on TOT ffmpeg, so remove its use everywhere in favor of av_packet_alloc
    and av_packet_free.

    Bug: chromium:1211508
    Change-Id: I154311071123110dd749c71dec1ec2a0452b3908
    Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/217780
    Commit-Queue: Ted Meyer <tmathmeyer@google.com>
    Reviewed-by: Sergey Silkin <ssilkin@webrtc.org>
    Cr-Commit-Position: refs/heads/master@{#34106}

third_party/libwebrtc/README.moz-ff-commit

@@ -5856,3 +5856,6 @@ ae0d117d51
 # MOZ_LIBWEBRTC_SRC=/home/mfroman/git-checkouts/trial-webrtc-builds/moz-libwebrtc-checkout/src MOZ_LIBWEBRTC_COMMIT=mjfdev bash dom/media/webrtc/third_party_build/fast-forward-libwebrtc.sh
 # base of lastest vendoring
 0f506780aa
+# MOZ_LIBWEBRTC_SRC=/home/mfroman/git-checkouts/trial-webrtc-builds/moz-libwebrtc-checkout/src MOZ_LIBWEBRTC_COMMIT=mjfdev bash dom/media/webrtc/third_party_build/fast-forward-libwebrtc.sh
+# base of lastest vendoring
+41a111d5b9

third_party/libwebrtc/README.mozilla

@@ -3906,3 +3906,5 @@ libwebrtc updated from /home/mfroman/git-checkouts/trial-webrtc-builds/moz-libwe
 libwebrtc updated from /home/mfroman/git-checkouts/trial-webrtc-builds/moz-libwebrtc-checkout/src commit mjfdev on 2022-05-26T16:48:48.280531.
 # python3 vendor-libwebrtc.py --from-local /home/mfroman/git-checkouts/trial-webrtc-builds/moz-libwebrtc-checkout/src --commit mjfdev libwebrtc
 libwebrtc updated from /home/mfroman/git-checkouts/trial-webrtc-builds/moz-libwebrtc-checkout/src commit mjfdev on 2022-05-26T17:01:43.999257.
+# python3 vendor-libwebrtc.py --from-local /home/mfroman/git-checkouts/trial-webrtc-builds/moz-libwebrtc-checkout/src --commit mjfdev libwebrtc
+libwebrtc updated from /home/mfroman/git-checkouts/trial-webrtc-builds/moz-libwebrtc-checkout/src commit mjfdev on 2022-05-26T17:04:54.294085.

third_party/libwebrtc/modules/video_coding/codecs/h264/h264_decoder_impl.cc

@@ -54,6 +54,16 @@ enum H264DecoderImplEvent {
   kH264DecoderEventMax = 16,
 };
 
+struct ScopedPtrAVFreePacket {
+  void operator()(AVPacket* packet) { av_packet_free(&packet); }
+};
+typedef std::unique_ptr<AVPacket, ScopedPtrAVFreePacket> ScopedAVPacket;
+
+ScopedAVPacket MakeScopedAVPacket() {
+  ScopedAVPacket packet(av_packet_alloc());
+  return packet;
+}
+
 }  // namespace
 
 int H264DecoderImpl::AVGetBuffer2(AVCodecContext* context,
@@ -202,7 +212,7 @@ int32_t H264DecoderImpl::InitDecode(const VideoCodec* codec_settings,
   // 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.
@@ -261,21 +271,25 @@ int32_t H264DecoderImpl::Decode(const EncodedImage& input_image,
     return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
   }
 
-  AVPacket packet;
-  av_init_packet(&packet);
+  ScopedAVPacket packet = MakeScopedAVPacket();
+  if (!packet) {
+    ReportError();
+    return WEBRTC_VIDEO_CODEC_ERROR;
+  }
   // packet.data has a non-const type, but isn't modified by
   // avcodec_send_packet.
-  packet.data = const_cast<uint8_t*>(input_image.data());
+  packet->data = const_cast<uint8_t*>(input_image.data());
   if (input_image.size() >
       static_cast<size_t>(std::numeric_limits<int>::max())) {
     ReportError();
     return WEBRTC_VIDEO_CODEC_ERROR;
   }
-  packet.size = static_cast<int>(input_image.size());
+  packet->size = static_cast<int>(input_image.size());
   int64_t frame_timestamp_us = input_image.ntp_time_ms_ * 1000;  // ms -> μs
   av_context_->reordered_opaque = frame_timestamp_us;
 
-  int result = avcodec_send_packet(av_context_.get(), &packet);
+  int result = avcodec_send_packet(av_context_.get(), packet.get());
+
   if (result < 0) {
     RTC_LOG(LS_ERROR) << "avcodec_send_packet error: " << result;
     ReportError();