107 lines
3.6 KiB
C++
107 lines
3.6 KiB
C++
// Copyright 2019 The MediaPipe Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "mediapipe/framework/calculator_framework.h"
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#include "mediapipe/framework/formats/matrix.h"
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#include "mediapipe/framework/port/logging.h"
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#include "mediapipe/framework/port/status.h"
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#include "mediapipe/util/audio_decoder.h"
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#include "mediapipe/util/audio_decoder.pb.h"
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namespace mediapipe {
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// The AudioDecoderCalculator decodes an audio stream of the media file. It
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// produces two output streams contain audio packets and the header infomation.
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//
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// Output Streams:
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// AUDIO: Output audio frames (Matrix).
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// AUDIO_HEADER:
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// Optional audio header information output
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// Input Side Packets:
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// INPUT_FILE_PATH: The input file path.
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//
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// Example config:
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// node {
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// calculator: "AudioDecoderCalculator"
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// input_side_packet: "INPUT_FILE_PATH:input_file_path"
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// output_stream: "AUDIO:audio"
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// output_stream: "AUDIO_HEADER:audio_header"
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// node_options {
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// [type.googleapis.com/mediapipe.AudioDecoderOptions]: {
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// audio_stream { stream_index: 0 }
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// start_time: 0
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// end_time: 1
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// }
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// }
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//
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// TODO: support decoding multiple streams.
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class AudioDecoderCalculator : public CalculatorBase {
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public:
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static ::mediapipe::Status GetContract(CalculatorContract* cc);
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::mediapipe::Status Open(CalculatorContext* cc) override;
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::mediapipe::Status Process(CalculatorContext* cc) override;
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::mediapipe::Status Close(CalculatorContext* cc) override;
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private:
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std::unique_ptr<AudioDecoder> decoder_;
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};
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::mediapipe::Status AudioDecoderCalculator::GetContract(
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CalculatorContract* cc) {
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cc->InputSidePackets().Tag("INPUT_FILE_PATH").Set<std::string>();
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cc->Outputs().Tag("AUDIO").Set<Matrix>();
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if (cc->Outputs().HasTag("AUDIO_HEADER")) {
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cc->Outputs().Tag("AUDIO_HEADER").SetNone();
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}
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return ::mediapipe::OkStatus();
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}
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::mediapipe::Status AudioDecoderCalculator::Open(CalculatorContext* cc) {
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const std::string& input_file_path =
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cc->InputSidePackets().Tag("INPUT_FILE_PATH").Get<std::string>();
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const auto& decoder_options = cc->Options<mediapipe::AudioDecoderOptions>();
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decoder_ = absl::make_unique<AudioDecoder>();
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MP_RETURN_IF_ERROR(decoder_->Initialize(input_file_path, decoder_options));
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std::unique_ptr<mediapipe::TimeSeriesHeader> header =
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absl::make_unique<mediapipe::TimeSeriesHeader>();
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if (decoder_->FillAudioHeader(decoder_options.audio_stream(0), header.get())
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.ok()) {
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// Only pass on a header if the decoder could actually produce one.
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// otherwise, the header will be empty.
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cc->Outputs().Tag("AUDIO_HEADER").SetHeader(Adopt(header.release()));
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}
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cc->Outputs().Tag("AUDIO_HEADER").Close();
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return ::mediapipe::OkStatus();
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}
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::mediapipe::Status AudioDecoderCalculator::Process(CalculatorContext* cc) {
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Packet data;
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int options_index = -1;
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auto status = decoder_->GetData(&options_index, &data);
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if (status.ok()) {
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cc->Outputs().Tag("AUDIO").AddPacket(data);
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}
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return status;
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}
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::mediapipe::Status AudioDecoderCalculator::Close(CalculatorContext* cc) {
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return decoder_->Close();
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}
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REGISTER_CALCULATOR(AudioDecoderCalculator);
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} // namespace mediapipe
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