From 4ddbd609e537acbf5610651772d969ea59f99a4c Mon Sep 17 00:00:00 2001 From: lonkaars Date: Sat, 3 Jun 2023 16:21:05 +0200 Subject: add comments and remove non-working align method --- os2eindopdracht/Arguments.h | 3 +++ os2eindopdracht/FilterWorker.h | 2 ++ os2eindopdracht/SampleStream.cpp | 6 ------ os2eindopdracht/SampleStream.h | 4 +++- os2eindopdracht/main.cpp | 19 +++++++++++++++---- 5 files changed, 23 insertions(+), 11 deletions(-) (limited to 'os2eindopdracht') diff --git a/os2eindopdracht/Arguments.h b/os2eindopdracht/Arguments.h index c61d3a9..c5c9cd5 100644 --- a/os2eindopdracht/Arguments.h +++ b/os2eindopdracht/Arguments.h @@ -4,6 +4,7 @@ using std::string; +/** @brief wrapper for magic numbers */ struct Coefficients { double b0; double b1; @@ -14,6 +15,7 @@ struct Coefficients { class Arguments { public: + /** @brief parse arguments using getopt */ Arguments(int argc, char** argv); public: @@ -24,6 +26,7 @@ public: Coefficients treble; private: + /** @brief calculate magic coefficients using bass and treble gain value */ void calculate_coefficients(); private: diff --git a/os2eindopdracht/FilterWorker.h b/os2eindopdracht/FilterWorker.h index 2883d8b..f5fdb6d 100644 --- a/os2eindopdracht/FilterWorker.h +++ b/os2eindopdracht/FilterWorker.h @@ -5,7 +5,9 @@ class FilterWorker { public: + /** @brief set input and output sample block */ FilterWorker(SampleBlock& input, SampleBlock& output); + /** @brief apply filtering using bass and treble coefficients to output sample block */ void filter(Coefficients bass, Coefficients treble); private: diff --git a/os2eindopdracht/SampleStream.cpp b/os2eindopdracht/SampleStream.cpp index e97c474..e037c5e 100644 --- a/os2eindopdracht/SampleStream.cpp +++ b/os2eindopdracht/SampleStream.cpp @@ -8,9 +8,6 @@ using std::min; SampleStream::SampleStream(string input_stream) { load(input_stream); - - // test direct sample editing: - // std::transform(_stream.begin(), _stream.end(), _stream.begin(), [](int16_t s) { return s/2; }); } void SampleStream::load(string input) { @@ -40,6 +37,3 @@ vector SampleStream::split(size_t block_size) { return out; } -void SampleStream::align(size_t block_size) { - return; -} diff --git a/os2eindopdracht/SampleStream.h b/os2eindopdracht/SampleStream.h index 5657b06..7ff5594 100644 --- a/os2eindopdracht/SampleStream.h +++ b/os2eindopdracht/SampleStream.h @@ -13,10 +13,12 @@ public: SampleStream(string input_stream); public: + /** @brief load raw pcm sample bytes (signed 16-bit little endian) to _stream */ void load(string input); + /** @brief print raw pcb sample bytes from _stream */ string save(); + /** @brief return array of SampleBlock for _stream using block_size */ vector split(size_t block_size); - void align(size_t block_size); public: vector _stream; diff --git a/os2eindopdracht/main.cpp b/os2eindopdracht/main.cpp index bc7ce17..b451652 100644 --- a/os2eindopdracht/main.cpp +++ b/os2eindopdracht/main.cpp @@ -14,37 +14,48 @@ using std::vector; using std::counting_semaphore; using std::thread; +using std::ref; #define SAMPLE_BLOCK_SIZE 1024 int main(int argc, char** argv) { + // parse arguments Arguments args(argc, argv); + // read input file to std::string std::fstream file_input(args.file_input, std::ios::in | std::ios::binary); std::stringstream file_input_content; file_input_content << file_input.rdbuf(); file_input.close(); + // convert std::string to vector SampleStream input(file_input_content.str()); + // split into 1024-sample blocks vector input_blocks = input.split(SAMPLE_BLOCK_SIZE); + // do the same for output stream (input stream is later used as reference but not mutated) SampleStream output(file_input_content.str()); vector output_blocks = output.split(SAMPLE_BLOCK_SIZE); + // c++20 semaphore for limiting active thread count counting_semaphore semaphore(args.max_threads); + // thread array vector threads; for (size_t i = 0; i < input_blocks.size(); i++) { - semaphore.acquire(); + semaphore.acquire(); // wait until less than args.max_threads threads are running + // create thread threads.push_back(thread([&args, &semaphore](SampleBlock& input, SampleBlock& output) { + // apply filter to output FilterWorker(input, output).filter(args.bass, args.treble); + // allow new thread to be created semaphore.release(); - }, std::ref(input_blocks[i]), std::ref(output_blocks[i]))); + }, ref(input_blocks[i]), ref(output_blocks[i]))); } + // make sure all threads are done for (thread& t : threads) t.join(); - output.align(SAMPLE_BLOCK_SIZE); - + // write pcm stream to output file std::fstream file_output(args.file_output, std::ios::out | std::ios::binary); std::string edited_stream = output.save(); file_output.write(edited_stream.c_str(), edited_stream.size()); -- cgit v1.2.3