encoderFFmpeg.hpp

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#pragma once
 
 
 
extern "C" {
#include <libavcodec/avcodec.h>
}
 
#include "uvgvpcc/uvgvpcc.hpp"
#include "abstract2DMapEncoder.hpp"
 
#include <map>
 
using namespace uvgvpcc_enc;
 
class EncoderFFmpeg : public Abstract2DMapEncoder {
public:
    EncoderFFmpeg(
        const ENCODER_TYPE& encoderType, 
        const std::string&codecName, // ex: "libx265"
        const std::string& deviceType,
        const std::string& codecOptions, // Set general options, ex: "preset=fast:crf=26"
        const std::string& codecParams // Set codec specific params, ex: "x265-params=log-level=0:crf=26:qp=22"
    ) : Abstract2DMapEncoder(encoderType), codecName_(codecName), deviceType_(deviceType) {
        char delimiter = ':';
        size_t start = 0;
        size_t end = 0;
 
        // Check if the general options, that are specified by the codec, are separated by colons (:)
        if (codecOptions != "")
        {
            end = codecOptions.find(delimiter);
            while (end != std::string::npos) {
                std::string temp = codecOptions.substr(start, end - start);
                size_t end_temp = temp.find('=');
                std::string key = temp.substr(0, end_temp);
                std::string value = temp.substr(end_temp+1, temp.length() - end_temp);
                codecOptions_[key] = value;
                start = end + 1;
                end = codecOptions.find(delimiter, start);
            }
            std::string temp = codecOptions.substr(start);
            size_t end_temp = temp.find('=', 0);
            codecOptions_[temp.substr(0, end_temp)] = temp.substr(end_temp+1, temp.length() - end_temp);
        } 
 
        if (codecParams == "")
        {
            codecParamsEnabler_ = "";
            codecParamsValues_ = "";
            return;
        }
 
        // Get the param enabler for the codec, ex: "x265-params" or "kvazaar-params"
        start = 0;
        delimiter = '=';
        end = codecParams.find(delimiter);
        codecParamsEnabler_ = codecParams.substr(start, end - start);
        
        // Get the param values for the codec, ex: "log-level=0:crf=26:qp=22". Two possible separators: comma (,) or colon (:)
        /*
            Commas (,) separators are required by some specific codecs (e.g., libkvazaar); however, they conflict with the --uvgvpc setting
            that uses commas(,) to separate global parameters.
            
            Thus, to work around this issue, we use plus (+) as separators in the --uvgvpc setting and then convert them to commas (,).
            
            Example: preset=fast+threads=40+period=1+psnr=0+info=0+qp=22 --> preset=fast,threads=40,period=1,psnr=0,info=0,qp=22
        */
        if (codecParams.find('+', end+1) != std::string::npos)
        {
            delimiter = '+';
            start = end + 1;
            end = codecParams.find(delimiter, start);
            std::string params_temp = "";
            while (end != std::string::npos) {
                params_temp += codecParams.substr(start, end - start)+ ",";
                start = end + 1;
                end = codecParams.find(delimiter, start);
            }
            params_temp += codecParams.substr(start, codecParams.length() - start);
            //printf("params_temp: %s\n", params_temp.c_str());
            codecParamsValues_ = params_temp;
        } else { // Else the params are separated by colons (:) as other codecs
            codecParamsValues_ = codecParams.substr(end+1, codecParams.length() - end);
        }
    };
    static void initializeLogCallback();
    void encodeGOFMaps(const std::shared_ptr<uvgvpcc_enc::GOF>& gof) override;
 
private:
    const std::string codecName_;
    const std::string deviceType_;
    std::string codecParamsEnabler_;
    std::string codecParamsValues_;
    std::map<std::string, std::string> codecOptions_;
};