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Rework experimental video reader to avoid duplication + add enable_ti…
…mestamps Signed-off-by: Joaquin Anton Guirao <[email protected]>
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| Original file line number | Diff line number | Diff line change |
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| // Copyright (c) 2022, NVIDIA CORPORATION & AFFILIATES. All rights reserved. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
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| #ifndef DALI_OPERATORS_READER_LOADER_VIDEO_VIDEO_LOADER_DECODER_BASE_H_ | ||
| #define DALI_OPERATORS_READER_LOADER_VIDEO_VIDEO_LOADER_DECODER_BASE_H_ | ||
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| #include <string> | ||
| #include <vector> | ||
| #include "dali/core/cuda_stream_pool.h" | ||
| #include "dali/operators/video/frames_decoder_base.h" | ||
| #include "dali/operators/video/frames_decoder_gpu.h" | ||
| #include "dali/operators/video/frames_decoder_cpu.h" | ||
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| namespace dali { | ||
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| struct VideoSampleDesc { | ||
| VideoSampleDesc(std::string filename = {}, int label = -1, int start = -1, int end = -1, | ||
| int stride = -1) | ||
| : filename_(filename), label_(label), start_(start), end_(end), stride_(stride) {} | ||
| std::string filename_; | ||
| int label_ = -1; | ||
| int start_ = -1; | ||
| int end_ = -1; | ||
| int stride_ = -1; | ||
| }; | ||
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| template <typename Backend> | ||
| struct VideoSample : public VideoSampleDesc { | ||
| VideoSample(std::string filename = {}, int label = -1, int start = -1, int end = -1, | ||
| int stride = -1) | ||
| : VideoSampleDesc{filename, label, start, end, stride} {} | ||
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| VideoSample(const VideoSampleDesc &other) noexcept | ||
| : VideoSampleDesc(other) {} | ||
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| // to be filled by Prefetch | ||
| Tensor<Backend> data_; | ||
| int64_t start_timestamp_ = -1; | ||
| }; | ||
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| template <typename Backend, typename FramesDecoderImpl, typename Sample = VideoSample<Backend>> | ||
| class VideoLoaderDecoder : public Loader<Backend, Sample, true> { | ||
| public: | ||
| explicit inline VideoLoaderDecoder(const OpSpec &spec): | ||
| Loader<Backend, Sample, true>(spec), | ||
| filenames_(spec.GetRepeatedArgument<std::string>("filenames")), | ||
| sequence_len_(spec.GetArgument<int>("sequence_length")), | ||
| stride_(spec.GetArgument<int>("stride")), | ||
| step_(spec.GetArgument<int>("step")) { | ||
| has_labels_ = spec.TryGetRepeatedArgument(labels_, "labels"); | ||
| DALI_ENFORCE( | ||
| !has_labels_ || labels_.size() == filenames_.size(), | ||
| make_string( | ||
| "Number of provided files and labels should match. Provided ", | ||
| filenames_.size(), " files and ", labels_.size(), " labels.")); | ||
| if (step_ <= 0) { | ||
| step_ = stride_ * sequence_len_; | ||
| } | ||
| } | ||
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| void PrepareEmpty(Sample &sample) { | ||
| sample = Sample(); | ||
| } | ||
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| void ReadSample(Sample &sample) override { | ||
| sample = Sample(samples_[current_index_]); | ||
| MoveToNextShard(++current_index_); | ||
| } | ||
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| void Skip() override { | ||
| MoveToNextShard(++current_index_); | ||
| } | ||
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| Index SizeImpl() override { | ||
| return samples_.size(); | ||
| } | ||
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| void PrepareMetadataImpl() override { | ||
| std::unique_ptr<FramesDecoderImpl> decoder; | ||
| for (size_t i = 0; i < filenames_.size(); ++i) { | ||
| const auto &filename = filenames_[i]; | ||
| int label = has_labels_ ? labels_[i] : -1; | ||
| decoder = std::make_unique<FramesDecoderImpl>(filename, true); | ||
| if (!decoder->IsValid()) { | ||
| LOG_LINE << "Invalid video file: " << filename << std::endl; | ||
| continue; | ||
| } | ||
| int64_t num_frames = decoder->NumFrames(); | ||
| for (int start = 0; start + stride_ * sequence_len_ <= num_frames; | ||
| start += step_) { | ||
| LOG_LINE << "Sample #" << samples_.size() << ": " << filename << " " << label << " " | ||
| << start << ".." << start + stride_ * sequence_len_ << std::endl; | ||
| samples_.emplace_back(filename, label, start, start + stride_ * sequence_len_, stride_); | ||
| } | ||
| } | ||
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| if (shuffle_) { | ||
| // seeded with hardcoded value to get | ||
| // the same sequence on every shard | ||
| std::mt19937 g(kDaliDataloaderSeed); | ||
| std::shuffle(std::begin(samples_), std::end(samples_), g); | ||
| } | ||
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| // set the initial index for each shard | ||
| Reset(true); | ||
| } | ||
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| void Reset(bool wrap_to_shard) override { | ||
| current_index_ = wrap_to_shard ? start_index(virtual_shard_id_, num_shards_, SizeImpl()) : 0; | ||
| } | ||
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| protected: | ||
| using Base = Loader<Backend, Sample, true>; | ||
| using Base::shard_id_; | ||
| using Base::virtual_shard_id_; | ||
| using Base::num_shards_; | ||
| using Base::stick_to_shard_; | ||
| using Base::shuffle_; | ||
| using Base::dont_use_mmap_; | ||
| using Base::initial_buffer_fill_; | ||
| using Base::copy_read_data_; | ||
| using Base::read_ahead_; | ||
| using Base::IsCheckpointingEnabled; | ||
| using Base::PrepareEmptyTensor; | ||
| using Base::MoveToNextShard; | ||
| using Base::ShouldSkipImage; | ||
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| std::vector<std::string> filenames_; | ||
| std::vector<int> labels_; | ||
| bool has_labels_ = false; | ||
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| Index current_index_ = 0; | ||
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| int sequence_len_; | ||
| int stride_; | ||
| int step_; | ||
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| std::vector<VideoSampleDesc> samples_; | ||
| CUDAStreamLease cuda_stream_; | ||
| }; | ||
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| } // namespace dali | ||
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| #endif // DALI_OPERATORS_READER_LOADER_VIDEO_VIDEO_LOADER_DECODER_BASE_H_ |
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