1 // Copyright 2012 The Chromium Authors
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef MEDIA_FILTERS_FFMPEG_VIDEO_DECODER_H_
6 #define MEDIA_FILTERS_FFMPEG_VIDEO_DECODER_H_
10 #include "base/callback.h"
11 #include "base/memory/raw_ptr.h"
12 #include "base/memory/ref_counted.h"
13 #include "base/sequence_checker.h"
14 #include "media/base/supported_video_decoder_config.h"
15 #include "media/base/video_decoder.h"
16 #include "media/base/video_decoder_config.h"
17 #include "media/base/video_frame_pool.h"
18 #include "media/ffmpeg/ffmpeg_deleters.h"
20 struct AVCodecContext;
26 class FFmpegDecodingLoop;
29 class MEDIA_EXPORT FFmpegVideoDecoder : public VideoDecoder {
31 static bool IsCodecSupported(VideoCodec codec);
32 static SupportedVideoDecoderConfigs SupportedConfigsForWebRTC();
34 explicit FFmpegVideoDecoder(MediaLog* media_log);
36 FFmpegVideoDecoder(const FFmpegVideoDecoder&) = delete;
37 FFmpegVideoDecoder& operator=(const FFmpegVideoDecoder&) = delete;
39 ~FFmpegVideoDecoder() override;
41 // Allow decoding of individual NALU. Entire frames are required by default.
42 // Disables low-latency mode. Must be called before Initialize().
43 void set_decode_nalus(bool decode_nalus) { decode_nalus_ = decode_nalus; }
45 // VideoDecoder implementation.
46 VideoDecoderType GetDecoderType() const override;
47 void Initialize(const VideoDecoderConfig& config,
49 CdmContext* cdm_context,
51 const OutputCB& output_cb,
52 const WaitingCB& waiting_cb) override;
53 void Decode(scoped_refptr<DecoderBuffer> buffer, DecodeCB decode_cb) override;
54 void Reset(base::OnceClosure closure) override;
56 // Callback called from within FFmpeg to allocate a buffer based on
57 // the dimensions of |codec_context|. See AVCodecContext.get_buffer2
58 // documentation inside FFmpeg.
59 int GetVideoBuffer(struct AVCodecContext* codec_context,
63 void force_allocation_error_for_testing() { force_allocation_error_ = true; }
66 enum class DecoderState { kUninitialized, kNormal, kDecodeFinished, kError };
68 // Handles decoding of an unencrypted encoded buffer. A return value of false
69 // indicates that an error has occurred.
70 bool FFmpegDecode(const DecoderBuffer& buffer);
71 bool OnNewFrame(AVFrame* frame);
73 // Handles (re-)initializing the decoder with a (new) config.
74 // Returns true if initialization was successful.
75 bool ConfigureDecoder(const VideoDecoderConfig& config, bool low_delay);
77 // Releases resources associated with |codec_context_|.
78 void ReleaseFFmpegResources();
80 SEQUENCE_CHECKER(sequence_checker_);
82 const raw_ptr<MediaLog> media_log_;
84 DecoderState state_ = DecoderState::kUninitialized;
88 // FFmpeg structures owned by this object.
89 std::unique_ptr<AVCodecContext, ScopedPtrAVFreeContext> codec_context_;
91 VideoDecoderConfig config_;
93 VideoFramePool frame_pool_;
95 bool decode_nalus_ = false;
97 bool force_allocation_error_ = false;
99 std::unique_ptr<FFmpegDecodingLoop> decoding_loop_;
104 #endif // MEDIA_FILTERS_FFMPEG_VIDEO_DECODER_H_