windows 使用ffmpeg .a静态库读取Wav音频并保存PCM的方法

#include <stdio.h>
#include <stdlib.h>
#include <libavformat/avformat.h>
<p>int main() {
// 定义输入和输出文件
const char<em> inputFile = "input.wav";
const char</em> outputFile = "output.pcm";</p><pre class="brush:php;toolbar:false">// 打开输入文件
AVFormatContext* inputContext = NULL;
if (avformat_open_input(&inputContext, inputFile, NULL, NULL) != 0) {
    fprintf(stderr, "无法打开输入文件\n");
    return -1;
}

// 查找音频流
AVStream* audioStream = NULL;
for (int i = 0; i < inputContext->nb_streams; i++) {
    if (inputContext->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
        audioStream = inputContext->streams[i];
        break;
    }
}

// 打开输出文件
AVFormatContext* outputContext = NULL;
if (avformat_alloc_output_context2(&outputContext, NULL, NULL, outputFile) != 0) {
    fprintf(stderr, "无法分配输出上下文\n");
    avformat_close_input(&inputContext);
    return -1;
}

// 添加音频流到输出上下文
AVStream* outputAudioStream = NULL;
outputAudioStream = avformat_new_stream(outputContext, NULL);
if (outputAudioStream == NULL) {
    fprintf(stderr, "无法添加音频流到输出上下文\n");
    avformat_close_input(&inputContext);
    avformat_free_context(outputContext);
    return -1;
}

// 初始化编码器
AVCodecContext* outputCodecContext = NULL;
outputCodecContext = outputAudioStream->codec;
outputCodecContext->codec_id = AV_CODEC_ID_PCM_S16LE;
outputCodecContext->sample_rate = audioStream->codecpar->sample_rate;
outputCodecContext->channels = audioStream->codecpar->channels;
outputCodecContext->sample_fmt = AV_SAMPLE_FMT_S16;
if (avcodec_open2(outputCodecContext, NULL, NULL) != 0) {
    fprintf(stderr, "无法初始化编码器\n");
    avformat_close_input(&inputContext);
    avformat_free_context(outputContext);
    return -1;
}

// 读取和写入数据
int packetIndex = 0;
AVPacket* inputPacket = av_packet_alloc();
while (av_read_frame(inputContext, inputPacket) >= 0) {
    if (inputPacket->stream_index == audioStream->index) {
        AVPacket* outputPacket = av_packet_alloc();
        if (avcodec_send_packet(outputCodecContext, inputPacket) == 0) {
            if (avcodec_receive_packet(outputCodecContext, outputPacket) == 0) {
                if (av_write_frame(outputContext, outputPacket) == 0) {
                    packetIndex++;
                }
                av_packet_free(&outputPacket);
            }
        }
    }
    av_packet_unref(inputPacket);
}
av_packet_free(&inputPacket);

// 关闭文件和清理资源
avcodec_close(outputCodecContext);
avformat_close_input(&inputContext);
avio_closep(&outputContext->pb);
avformat_free_context(outputContext);

printf("成功处理 %d 个数据包\n", packetIndex);
return 0;