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Unified Diff: services/media/framework_ffmpeg/ffmpeg_decoder_base.h

Issue 1686363002: Motown: ffmpeg implementations of framework 'parts' (Closed) Base URL: https://github.com/domokit/mojo.git@master
Patch Set: Changed the way AVBuffer allocation/deallocation is done in the ffmpeg audio decoder. Created 4 years, 10 months ago
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Index: services/media/framework_ffmpeg/ffmpeg_decoder_base.h
diff --git a/services/media/framework_ffmpeg/ffmpeg_decoder_base.h b/services/media/framework_ffmpeg/ffmpeg_decoder_base.h
new file mode 100644
index 0000000000000000000000000000000000000000..833673f2e7a08db484ed5c6d39d7d99971b81f9c
--- /dev/null
+++ b/services/media/framework_ffmpeg/ffmpeg_decoder_base.h
@@ -0,0 +1,87 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef SERVICES_MEDIA_FRAMEWORK_FFMPEG_FFMPEG_DECODER_BASE_H_
+#define SERVICES_MEDIA_FRAMEWORK_FFMPEG_FFMPEG_DECODER_BASE_H_
+
+#include "services/media/framework/parts/decoder.h"
+#include "services/media/framework_ffmpeg/ffmpeg_type_converters.h"
+extern "C" {
+#include "third_party/ffmpeg/libavcodec/avcodec.h"
+}
+
+namespace mojo {
+namespace media {
+
+// Abstract base class for ffmpeg-based decoders.
+class FfmpegDecoderBase : public Decoder {
+ public:
+ FfmpegDecoderBase(AvCodecContextPtr av_codec_context);
+
+ ~FfmpegDecoderBase() override;
+
+ // Decoder implementation.
+ std::unique_ptr<StreamType> output_stream_type() override;
+
+ // Transform implementation.
+ void Flush() override;
+
+ bool TransformPacket(
+ const PacketPtr& input,
+ bool new_input,
+ PayloadAllocator* allocator,
+ PacketPtr* output) override;
+
+ protected:
+ struct AVFrameDeleter {
+ inline void operator()(AVFrame* ptr) const {
+ av_frame_free(&ptr);
+ }
+ };
+
+ // Decodes from av_packet_ into av_frame_. The result indicates how many
+ // bytes were consumed from av_packet_. *frame_decoded_out indicates whether
+ // av_frame_ contains a complete frame.
+ virtual int Decode(PayloadAllocator* allocator, bool* frame_decoded_out) = 0;
+
+ // Creates a Packet from av_frame_.
+ virtual PacketPtr CreateOutputPacket(PayloadAllocator* allocator) = 0;
+
+ // Creates an end-of-stream packet with no payload.
+ virtual PacketPtr CreateOutputEndOfStreamPacket() = 0;
+
+ protected:
+ // The ffmpeg codec context.
+ const AvCodecContextPtr& context() {
+ return av_codec_context_;
+ }
+
+ // Ffmpeg's representation of the input packet.
+ const AVPacket& packet() {
+ return av_packet_;
+ }
+
+ // Ffmpeg's representation of the output packet.
+ const std::unique_ptr<AVFrame, AVFrameDeleter>& frame() {
+ return av_frame_;
+ }
+
+ private:
+ // Prepares to process a new input packet.
+ void PrepareInputPacket(const PacketPtr& input);
+
+ // Finishes up after processing of an input packet has completed, possibly
+ // producing a zero-size end-of-stream packet. Returns true to indicate that
+ // a new input packet is required.
+ bool UnprepareInputPacket(const PacketPtr& input, PacketPtr* output);
+
+ AvCodecContextPtr av_codec_context_;
+ AVPacket av_packet_;
+ std::unique_ptr<AVFrame, AVFrameDeleter> av_frame_;
+};
+
+} // namespace media
+} // namespace mojo
+
+#endif // SERVICES_MEDIA_FRAMEWORK_FFMPEG_FFMPEG_DECODER_BASE_H_

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