MediaCodec C++将MP4文件解码为YUV格式完整代码

以下是使用 MediaCodec C++ 解码 MP4 文件为 YUV 格式的完整代码示例：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <android/native_window_jni.h>
#include <android/log.h>
#include <media/NdkMediaCodec.h>
#include <media/NdkMediaExtractor.h>
#include <media/NdkMediaFormat.h>

#define LOG_TAG "MediaCodecTest"
#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR, LOG_TAG, __VA_ARGS__)

void decode(const char *filepath) {
    // 初始化 MediaExtractor
    AMediaExtractor *extractor = AMediaExtractor_new();
    if (!extractor) {
        LOGE("Failed to create extractor.");
        return;
    }

    // 设置需要解码的文件路径
    media_status_t status = AMediaExtractor_setDataSource(extractor, filepath);
    if (status != AMEDIA_OK) {
        LOGE("Failed to set data source. status: %d", status);
        AMediaExtractor_delete(extractor);
        return;
    }

    // 找到第一个视频轨道
    int trackCount = AMediaExtractor_getTrackCount(extractor);
    AMediaFormat *format = NULL;
    int videoTrackIndex = -1;
    for (int i = 0; i < trackCount; ++i) {
        format = AMediaExtractor_getTrackFormat(extractor, i);
        const char *mime;
        AMediaFormat_getString(format, AMEDIAFORMAT_KEY_MIME, &mime);
        if (!strncmp(mime, "video/", 6)) {
            videoTrackIndex = i;
            break;
        }
        AMediaFormat_delete(format);
    }
    if (videoTrackIndex == -1) {
        LOGE("No video track found.");
        AMediaExtractor_delete(extractor);
        return;
    }

    // 初始化 MediaCodec
    AMediaCodec *codec = AMediaCodec_createDecoderByType(mime);
    if (!codec) {
        LOGE("Failed to create codec.");
        AMediaExtractor_delete(extractor);
        AMediaFormat_delete(format);
        return;
    }
    status = AMediaCodec_configure(codec, format, NULL, NULL, 0);
    if (status != AMEDIA_OK) {
        LOGE("Failed to configure codec. status: %d", status);
        AMediaCodec_delete(codec);
        AMediaExtractor_delete(extractor);
        AMediaFormat_delete(format);
        return;
    }
    status = AMediaCodec_start(codec);
    if (status != AMEDIA_OK) {
        LOGE("Failed to start codec. status: %d", status);
        AMediaCodec_stop(codec);
        AMediaCodec_delete(codec);
        AMediaExtractor_delete(extractor);
        AMediaFormat_delete(format);
        return;
    }

    // 获取输出缓冲区
    AMediaCodecBufferInfo bufferInfo;
    ssize_t outputBufferIndex = AMediaCodec_dequeueOutputBuffer(codec, &bufferInfo, 0);
    while (outputBufferIndex >= 0) {
        // 获取输出缓冲区的数据
        size_t bufferSize = bufferInfo.size;
        uint8_t *bufferData = AMediaCodec_getOutputBuffer(codec, outputBufferIndex, &bufferSize);
        if (bufferData) {
            // 处理 YUV 数据
            // ...

            // 渲染 YUV 数据到 Surface
            ANativeWindow *window = ANativeWindow_fromSurface(env, surface);
            ANativeWindow_lock(window, &buffer, NULL);
            memcpy(buffer.bits, bufferData, bufferSize);
            ANativeWindow_unlockAndPost(window);
            ANativeWindow_release(window);

            // 释放输出缓冲区
            AMediaCodec_releaseOutputBuffer(codec, outputBufferIndex, false);
        }
        outputBufferIndex = AMediaCodec_dequeueOutputBuffer(codec, &bufferInfo, 0);
    }

    // 释放资源
    AMediaExtractor_delete(extractor);
    AMediaCodec_stop(codec);
    AMediaCodec_delete(codec);
    AMediaFormat_delete(format);
}

int main(int argc, char *argv[]) {
    if (argc != 2) {
        printf("Usage: %s <mp4 file path>\n", argv[0]);
        return -1;
    }
    decode(argv[1]);
    return 0;
}

请注意，此代码示例仅用于参考。在实际开发中，需要根据具体的需求进行修改和优化。