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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
commit | 26a029d407be480d791972afb5975cf62c9360a6 (patch) | |
tree | f435a8308119effd964b339f76abb83a57c29483 /third_party/libwebrtc/modules/video_coding/codecs/h264/h264_decoder_impl.h | |
parent | Initial commit. (diff) | |
download | firefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz firefox-26a029d407be480d791972afb5975cf62c9360a6.zip |
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'third_party/libwebrtc/modules/video_coding/codecs/h264/h264_decoder_impl.h')
-rw-r--r-- | third_party/libwebrtc/modules/video_coding/codecs/h264/h264_decoder_impl.h | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/video_coding/codecs/h264/h264_decoder_impl.h b/third_party/libwebrtc/modules/video_coding/codecs/h264/h264_decoder_impl.h new file mode 100644 index 0000000000..97d091cf4b --- /dev/null +++ b/third_party/libwebrtc/modules/video_coding/codecs/h264/h264_decoder_impl.h @@ -0,0 +1,109 @@ +/* + * Copyright (c) 2015 The WebRTC 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 MODULES_VIDEO_CODING_CODECS_H264_H264_DECODER_IMPL_H_ +#define MODULES_VIDEO_CODING_CODECS_H264_H264_DECODER_IMPL_H_ + +// Everything declared in this header is only required when WebRTC is +// build with H264 support, please do not move anything out of the +// #ifdef unless needed and tested. +#ifdef WEBRTC_USE_H264 + +#if defined(WEBRTC_WIN) && !defined(__clang__) +#error "See: bugs.webrtc.org/9213#c13." +#endif + +#include <memory> + +#include "modules/video_coding/codecs/h264/include/h264.h" + +// CAVEAT: According to ffmpeg docs for avcodec_send_packet, ffmpeg requires a +// few extra padding bytes after the end of input. And in addition, docs for +// AV_INPUT_BUFFER_PADDING_SIZE says "If the first 23 bits of the additional +// bytes are not 0, then damaged MPEG bitstreams could cause overread and +// segfault." +// +// WebRTC doesn't ensure any such padding, and REQUIRES ffmpeg to be compiled +// with CONFIG_SAFE_BITSTREAM_READER, which is intended to eliminate +// out-of-bounds reads. ffmpeg docs doesn't say explicitly what effects this +// flag has on the h.264 decoder or avcodec_send_packet, though, so this is in +// some way depending on undocumented behavior. If any problems turn up, we may +// have to add an extra copy operation, to enforce padding before buffers are +// passed to ffmpeg. + +extern "C" { +#include "third_party/ffmpeg/libavcodec/avcodec.h" +} // extern "C" + +#include "common_video/h264/h264_bitstream_parser.h" +#include "common_video/include/video_frame_buffer_pool.h" + +namespace webrtc { + +struct AVCodecContextDeleter { + void operator()(AVCodecContext* ptr) const { avcodec_free_context(&ptr); } +}; +struct AVFrameDeleter { + void operator()(AVFrame* ptr) const { av_frame_free(&ptr); } +}; + +class H264DecoderImpl : public H264Decoder { + public: + H264DecoderImpl(); + ~H264DecoderImpl() override; + + bool Configure(const Settings& settings) override; + int32_t Release() override; + + int32_t RegisterDecodeCompleteCallback( + DecodedImageCallback* callback) override; + + // `missing_frames`, `fragmentation` and `render_time_ms` are ignored. + int32_t Decode(const EncodedImage& input_image, + bool /*missing_frames*/, + int64_t render_time_ms = -1) override; + + const char* ImplementationName() const override; + + private: + // Called by FFmpeg when it needs a frame buffer to store decoded frames in. + // The `VideoFrame` returned by FFmpeg at `Decode` originate from here. Their + // buffers are reference counted and freed by FFmpeg using `AVFreeBuffer2`. + static int AVGetBuffer2(AVCodecContext* context, + AVFrame* av_frame, + int flags); + // Called by FFmpeg when it is done with a video frame, see `AVGetBuffer2`. + static void AVFreeBuffer2(void* opaque, uint8_t* data); + + bool IsInitialized() const; + + // Reports statistics with histograms. + void ReportInit(); + void ReportError(); + + // Used by ffmpeg via `AVGetBuffer2()` to allocate I420 images. + VideoFrameBufferPool ffmpeg_buffer_pool_; + std::unique_ptr<AVCodecContext, AVCodecContextDeleter> av_context_; + std::unique_ptr<AVFrame, AVFrameDeleter> av_frame_; + + DecodedImageCallback* decoded_image_callback_; + + bool has_reported_init_; + bool has_reported_error_; + + webrtc::H264BitstreamParser h264_bitstream_parser_; +}; + +} // namespace webrtc + +#endif // WEBRTC_USE_H264 + +#endif // MODULES_VIDEO_CODING_CODECS_H264_H264_DECODER_IMPL_H_ |