blob: 5e66e079e4b669fc3e625441fc51555ff0166cad [file] [log] [blame]
* 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.
#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/i420_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 {
~H264DecoderImpl() override;
// If |codec_settings| is NULL it is ignored. If it is not NULL,
// |codec_settings->codecType| must be |kVideoCodecH264|.
int32_t InitDecode(const VideoCodec* codec_settings,
int32_t number_of_cores) 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;
const bool kEnable8bitHdrFix_;
// 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();
I420BufferPool 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