rattatwinko
1a00e98661
--- more thorough commit message which was generated by the wonderful copilot AI tool: Refactor and enhance audio encoding and decoding pipelines - Introduced CodecUtils.h for utility functions related to audio codec selection, including sample format and bitrate clamping. - Added DecoderPipeline.h to manage audio decoding, including opening files and retrieving audio stream information. - Implemented EncoderPipeline.h to handle audio encoding, including encoder setup, resampling, and writing output files. - Created OutputPathBuilder.h to generate output file paths based on reencode job specifications. - Refactored SpectrogramWidget to improve OpenGL handling and ensure safe context usage. - Updated ReencodeDialog.h to enhance code readability and maintainability. - Improved error handling and logging throughout the audio processing components.
46 lines
1.1 KiB
C++
46 lines
1.1 KiB
C++
#pragma once
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extern "C" {
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#include <libavcodec/avcodec.h>
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}
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namespace engine {
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/**
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* @brief Selection Priority:
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* 1. Exact match with sourceRate
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* 2. Lowest supported rate that is >= sourceRate (upsample as little as possible)
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* 3. Highest supported rate overall
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* rates are below sourceRate, eg a low rate phone codec at 8khz
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*/
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inline int pickSampleRate(const AVCodec *encoder, int sourceRate)
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{
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if (!encoder->supported_samplerates)
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return sourceRate;
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// 1: exact match
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for (const int *r = encoder->supported_samplerates; *r != 0; ++r)
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if (*r == sourceRate)
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return sourceRate;
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// 2: lowest rate >= sourceRate (minimal upsampling)
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int best = 0;
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for (const int *r = encoder->supported_samplerates; *r != 0; ++r) {
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if (*r >= sourceRate) {
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if (best == 0 || *r < best)
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best = *r;
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}
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}
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if (best != 0)
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return best;
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// 3: all supported rates are below sourceRate
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for (const int *r = encoder->supported_samplerates; *r != 0; ++r)
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if (*r > best)
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best = *r;
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return best;
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}
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} // namespace engine
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