Android硬解码视频

首先需要使用MediaExtractor

MediaExtractor extractor = new MediaExtractor();

设置本地视频

extractor.setDataSource(videoFilePath);

遍历视频所有轨道

for (int i = 0; i < extractor.getTrackCount(); i++)

获取轨道的格式

MediaFormat tempFormat = extractor.getTrackFormat(i);
String mime = tempFormat.getString(MediaFormat.KEY_MIME);

接下来进行视频的解码，先构造出一个解码器

 MediaCodec codec = MediaCodec.createDecoderByType(format.getString(MediaFormat.KEY_MIME));
            codec.configure(format, null, null, 0);
            codec.start();
            
 //初始化输入和输出缓冲区数组
ByteBuffer[] inputBuffers = codec.getInputBuffers();
ByteBuffer[] outputBuffers = codec.getOutputBuffers();

解码循环

while (!isEOS) {
                int inputBufferIndex = codec.dequeueInputBuffer(10000);
                if (inputBufferIndex >= 0) {
                    ByteBuffer inputBuffer = inputBuffers[inputBufferIndex];
                    int sampleSize = extractor.readSampleData(inputBuffer, 0);
                    long presentationTimeUs = extractor.getSampleTime();
                    if (sampleSize < 0) {
                        isEOS = true;
                        codec.queueInputBuffer(inputBufferIndex, 0, 0, 0, 0);
                    } else {
                        codec.queueInputBuffer(inputBufferIndex, 0, sampleSize, presentationTimeUs, 0);
                        extractor.advance();
                    }
                }

                // 输出解码的帧
                int outputBufferIndex = codec.dequeueOutputBuffer(new MediaCodec.BufferInfo(), 2000);
                while (outputBufferIndex >= 0) {
                		//将获取到的ByteBuffer数据转为byte[]
                 		ByteBuffer outputBuffer = outputBuffers[outputBufferIndex];
                    byte[] yuvBytes = new byte[outputBuffer.remaining()];
                    outputBuffer.get(yuvBytes);
                    // 释放输出缓冲区
                    codec.releaseOutputBuffer(outputBufferIndex, false);
                    outputBufferIndex = codec.dequeueOutputBuffer(new MediaCodec.BufferInfo(), 0);
                }
            }

最后循环完成后记得将资源释放！！！

完整代码(根据代码提示自行添加try  catch)

public static void extractFrames(String videoFilePath){

		 MediaExtractor extractor = new MediaExtractor();
 		 extractor.setDataSource(videoFilePath);
     MediaFormat format = null;
     int trackIndex = -1;
     
      // 找到视频轨道
     for (int i = 0; i < extractor.getTrackCount(); i++) {
         MediaFormat tempFormat = extractor.getTrackFormat(i);
         String mime = tempFormat.getString(MediaFormat.KEY_MIME);
         //检查MIME类型
         if (mime.startsWith("video/")) {
             format = tempFormat;
             trackIndex = i;
             extractor.selectTrack(trackIndex);
             
             //获取视频的宽高(根据需求看是否需要)
             width = format.getInteger(MediaFormat.KEY_WIDTH);
             height = format.getInteger(MediaFormat.KEY_HEIGHT);
             
             // 获取帧率(根据需求看是否需要)
             int frameRate = format.getInteger(MediaFormat.KEY_FRAME_RATE);
             if (frameRate < 0) {
                frameRate = 0;
             }
             totalFrames = format.getLong(MediaFormat.KEY_DURATION) / 1000000 * frameRate;
             break;
          }
      }
    
     MediaCodec codec = MediaCodec.createDecoderByType(format.getString(MediaFormat.KEY_MIME));
     codec.configure(format, null, null, 0);
     codec.start();

		 //初始化输入和输出缓冲区数组
     ByteBuffer[] inputBuffers = codec.getInputBuffers();
     ByteBuffer[] outputBuffers = codec.getOutputBuffers();
     boolean isEOS = false;     
     
     while (!isEOS) {
           int inputBufferIndex = codec.dequeueInputBuffer(10000);
          if (inputBufferIndex >= 0) {
              ByteBuffer inputBuffer = inputBuffers[inputBufferIndex];
              int sampleSize = extractor.readSampleData(inputBuffer, 0);
              long presentationTimeUs = extractor.getSampleTime();
              if (sampleSize < 0) {
                  isEOS = true;
                  codec.queueInputBuffer(inputBufferIndex, 0, 0, 0, 0);
              } else {
                 codec.queueInputBuffer(inputBufferIndex, 0, sampleSize, presentationTimeUs, 0);
                 extractor.advance();
                }
             }

             // 输出解码的帧
             int outputBufferIndex = codec.dequeueOutputBuffer(new MediaCodec.BufferInfo(), 2000);
             while (outputBufferIndex >= 0) {
                //将获取到的ByteBuffer数据转为byte[]
                 	ByteBuffer outputBuffer = outputBuffers[outputBufferIndex];
                  byte[] yuvBytes = new byte[outputBuffer.remaining()];
                  outputBuffer.get(yuvBytes);
                  // 释放输出缓冲区
                  codec.releaseOutputBuffer(outputBufferIndex, false);
                  outputBufferIndex = codec.dequeueOutputBuffer(new MediaCodec.BufferInfo(), 0);
              }
     }
     
    codec.stop();
    codec.release();
    extractor.release();
}