// test_ffmpeg.cpp : 此文件包含 "main" 函數(shù)。程序執(zhí)行將在此處開始并結(jié)束。
//
//#include <iostream>
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
//#pragma comment(lib, "libavdevice.a")
//#pragma comment(lib, "libavformat.a")
//#pragma comment(lib, "libavutil.a")
//#pragma comment(lib, "libavcodec.a")
//#pragma comment(lib, "libavfilter.a")
//#pragma comment(lib, "libswresample.a")
//#pragma comment(lib, "libswscale.a")
int main(int arvc, char*argv[]) {
    //av_register_all();
    printf("start...\n");
    AVFormatContext* formatCtx = NULL;
    const AVInputFormat* inputFmt = av_find_input_format(arvc > 1 ? argv[1] : "FLAC");
	int ret = 0;
	printf("format name: %s, long name; %s\n", inputFmt->name, inputFmt->long_name);
    // 打開輸入流
    if ((ret = avformat_open_input(&formatCtx, "D:\\project\\ffmpeg-6.1.1\\test_in.wav", inputFmt, NULL)) != 0) {
        printf("Unable to open input stream: %s\n", av_err2str(ret));
        return -1;
    }
    // 查找音頻流信息
    if (avformat_find_stream_info(formatCtx, NULL) < 0) {
        printf("Unable to find audio stream information: %s\n", av_err2str(ret));
        return -1;
    }
    // 尋找第一個(gè)音頻流索引
    int audioStreamIndex = av_find_best_stream(formatCtx, AVMEDIA_TYPE_AUDIO, -1, -1, NULL, 0);
    if (audioStreamIndex < 0) {
        printf("Unable to find audio stream: %s\n", av_err2str(ret));
        return -1;
    }
    //const AVCodecContext* codecCtx = formatCtx->streams[audioStreamIndex]->codec;
    AVCodecContext* pCodecCtx = avcodec_alloc_context3(NULL);
    if (pCodecCtx == NULL)
    {
        printf("Could not allocate AVCodecContext: %s\n", av_err2str(ret));
        return -1;
    }
    avcodec_parameters_to_context(pCodecCtx, formatCtx->streams[audioStreamIndex]->codecpar);
    // 打開解碼器
    const AVCodec* codec = avcodec_find_decoder(pCodecCtx->codec_id);
    if (avcodec_open2(pCodecCtx, codec, NULL) < 0) {
        printf("Unable to open decoder: %s\n", av_err2str(ret));
        return -1;
    }
    // 創(chuàng)建輸出文件
    FILE* outputFile = fopen("output.pcm", "wb");
    AVPacket packet;
	printf("start read frame...\n");
    while ((ret = av_read_frame(formatCtx, &packet)) == 0) {
        // 如果數(shù)據(jù)包是音頻數(shù)據(jù)
        if (packet.stream_index == audioStreamIndex) {
            AVFrame* frame = av_frame_alloc();
            int gotFrame = 0;
			printf("read frame...index %d\n", audioStreamIndex);
            // 解碼音頻幀
            //avcodec_decode_audio4(pCodecCtx, frame, &gotFrame, &packet);
            if (avcodec_send_packet(pCodecCtx, &packet) < 0
                || (gotFrame = avcodec_receive_frame(pCodecCtx, frame)) < 0) {
                return -1;
            }
			printf("read frame...gotFrame = %d, frame size %d, frame pointer 0x%x\n", (ret), frame->linesize[0], frame->data[0]);
            if (gotFrame == 0) {
                // 處理解碼后的音頻數(shù)據(jù)，例如寫入文件等
                fwrite(frame->data[0], 1, frame->linesize[0], outputFile);
            }
            av_frame_free(&frame);
        }
        //av_free_packet(&packet);
        av_packet_unref(&packet);
    }
	printf("read frame end. ret = %s\n", av_err2str(ret));
    fclose(outputFile);
    avformat_close_input(&formatCtx);
    return 0;
}
// 運(yùn)行程序: Ctrl + F5 或調(diào)試 >“開始執(zhí)行(不調(diào)試)”菜單
// 調(diào)試程序: F5 或調(diào)試 >“開始調(diào)試”菜單
// 入門使用技巧: 
//   1. 使用解決方案資源管理器窗口添加/管理文件
//   2. 使用團(tuán)隊(duì)資源管理器窗口連接到源代碼管理
//   3. 使用輸出窗口查看生成輸出和其他消息
//   4. 使用錯(cuò)誤列表窗口查看錯(cuò)誤
//   5. 轉(zhuǎn)到“項(xiàng)目”>“添加新項(xiàng)”以創(chuàng)建新的代碼文件，或轉(zhuǎn)到“項(xiàng)目”>“添加現(xiàn)有項(xiàng)”以將現(xiàn)有代碼文件添加到項(xiàng)目
//   6. 將來，若要再次打開此項(xiàng)目，請(qǐng)轉(zhuǎn)到“文件”>“打開”>“項(xiàng)目”并選擇 .sln 文件

gcc -c test.c -o test.o -I./ffmpeg-bin/include 
gcc -Llibavcodec -Llibavdevice -Llibavfilter -Llibavformat -Llibavutil -Llibpostproc -Llibswscale -Llibswresample -Wl,--nxcompat,--dynamicbase -Wl,--high-entropy-va -Wl,--as-needed -Wl,--warn-common -Wl,-rpath-link=:libpostproc:libswresample:libswscale:libavfilter:libavdevice:libavformat:libavcodec:libavutil  -Wl,--image-base,0x140000000 -o test_g test.o -lavdevice -lavfilter -lavformat -lavcodec -lswresample -lswscale -lavutil  -lpsapi -lole32 -lstrmiids -luuid -loleaut32 -lshlwapi -lgdi32 -lm -latomic -lvfw32 -lm -latomic -lm -latomic -lz -lsecur32 -lws2_32 -liconv -lm -latomic -lmfuuid -lole32 -lstrmiids -lole32 -luser32 -lz -lm -latomic -lm -latomic -lm -luser32 -lbcrypt -latomic  -lole32 -lpsapi -lshell32
strip -o test_1.exe test_g.exe
# 使用upx壓縮應(yīng)用(需要windows終端執(zhí)行)
upx.exe -9 -o test.exe test_1.exe
rm -rf test_g.exe test_1.exe
./test.exe