frank
7 years ago
parent
17b18af513
commit
39808aca1c
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//
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// Created by frank on 2018/2/1.
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//
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#include "libavcodec/avcodec.h" |
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#include "libavformat/avformat.h" |
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#include "libswscale/swscale.h" |
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#include <android/native_window.h> |
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#include <android/native_window_jni.h> |
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#include <stdio.h> |
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#include <unistd.h> |
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#include <libavutil/imgutils.h> |
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#include <android/log.h> |
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#define TAG "MediaPlayer" |
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#define LOGI(FORMAT,...) __android_log_print(ANDROID_LOG_INFO, TAG, FORMAT, ##__VA_ARGS__); |
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#define LOGE(FORMAT,...) __android_log_print(ANDROID_LOG_ERROR, TAG, FORMAT, ##__VA_ARGS__); |
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//播放倍率
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float play_rate = 1; |
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//视频总时长
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long duration = 0; |
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JNIEXPORT jint JNICALL Java_com_frank_ffmpeg_VideoPlayer_play |
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(JNIEnv * env, jclass clazz, jstring filePath, jobject surface){ |
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const char * file_name = (*env)->GetStringUTFChars(env, filePath, JNI_FALSE); |
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//注册所有组件
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av_register_all(); |
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//分配上下文
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AVFormatContext * pFormatCtx = avformat_alloc_context(); |
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//打开视频文件
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if(avformat_open_input(&pFormatCtx, file_name, NULL, NULL)!=0) { |
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LOGE("Couldn't open file:%s\n", file_name); |
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return -1; |
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} |
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//检索多媒体流信息
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if(avformat_find_stream_info(pFormatCtx, NULL)<0) { |
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LOGE("Couldn't find stream information."); |
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return -1; |
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} |
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//寻找视频流的第一帧
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int videoStream = -1, i; |
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for (i = 0; i < pFormatCtx->nb_streams; i++) { |
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if (pFormatCtx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO |
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&& videoStream < 0) { |
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videoStream = i; |
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} |
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} |
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if(videoStream==-1) { |
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LOGE("couldn't find a video stream."); |
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return -1; |
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} |
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//获取视频总时长
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if (pFormatCtx->duration != AV_NOPTS_VALUE) { |
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duration = (long) (pFormatCtx->duration / AV_TIME_BASE); |
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LOGE("duration=%d", duration); |
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} |
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//获取codec上下文指针
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AVCodecContext * pCodecCtx = pFormatCtx->streams[videoStream]->codec; |
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//寻找视频流的解码器
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AVCodec * pCodec = avcodec_find_decoder(pCodecCtx->codec_id); |
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if(pCodec==NULL) { |
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LOGE("couldn't find Codec."); |
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return -1; |
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} |
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if(avcodec_open2(pCodecCtx, pCodec, NULL) < 0) { |
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LOGE("Couldn't open codec."); |
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return -1; |
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} |
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// 获取native window
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ANativeWindow* nativeWindow = ANativeWindow_fromSurface(env, surface); |
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// 获取视频宽高
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int videoWidth = pCodecCtx->width; |
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int videoHeight = pCodecCtx->height; |
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// 设置native window的buffer大小,可自动拉伸
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ANativeWindow_setBuffersGeometry(nativeWindow, videoWidth, videoHeight, WINDOW_FORMAT_RGBA_8888); |
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ANativeWindow_Buffer windowBuffer; |
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if(avcodec_open2(pCodecCtx, pCodec, NULL)<0) { |
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LOGE("Couldn't open codec."); |
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return -1; |
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} |
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//申请内存
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AVFrame * pFrame = av_frame_alloc(); |
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AVFrame * pFrameRGBA = av_frame_alloc(); |
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if(pFrameRGBA == NULL || pFrame == NULL) { |
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LOGE("Couldn't allocate video frame."); |
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return -1; |
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} |
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// buffer中数据用于渲染,且格式为RGBA
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int numBytes=av_image_get_buffer_size(AV_PIX_FMT_RGBA, pCodecCtx->width, pCodecCtx->height, 1); |
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uint8_t * buffer=(uint8_t *)av_malloc(numBytes*sizeof(uint8_t)); |
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av_image_fill_arrays(pFrameRGBA->data, pFrameRGBA->linesize, buffer, AV_PIX_FMT_RGBA, |
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pCodecCtx->width, pCodecCtx->height, 1); |
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// 由于解码出来的帧格式不是RGBA的,在渲染之前需要进行格式转换
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struct SwsContext *sws_ctx = sws_getContext(pCodecCtx->width, |
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pCodecCtx->height, |
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pCodecCtx->pix_fmt, |
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pCodecCtx->width, |
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pCodecCtx->height, |
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AV_PIX_FMT_RGBA, |
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SWS_BILINEAR, |
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NULL, |
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NULL, |
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NULL); |
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int frameFinished; |
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AVPacket packet; |
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while(av_read_frame(pFormatCtx, &packet)>=0) { |
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//判断是否为视频流
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if(packet.stream_index==videoStream) { |
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//对该帧进行解码
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avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished, &packet); |
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if (frameFinished) { |
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// lock native window
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ANativeWindow_lock(nativeWindow, &windowBuffer, 0); |
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// 格式转换
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sws_scale(sws_ctx, (uint8_t const * const *)pFrame->data, |
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pFrame->linesize, 0, pCodecCtx->height, |
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pFrameRGBA->data, pFrameRGBA->linesize); |
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// 获取stride
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uint8_t * dst = windowBuffer.bits; |
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int dstStride = windowBuffer.stride * 4; |
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uint8_t * src = pFrameRGBA->data[0]; |
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int srcStride = pFrameRGBA->linesize[0]; |
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// 由于window的stride和帧的stride不同,因此需要逐行复制
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int h; |
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for (h = 0; h < videoHeight; h++) { |
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memcpy(dst + h * dstStride, src + h * srcStride, (size_t) srcStride); |
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} |
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ANativeWindow_unlockAndPost(nativeWindow); |
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} |
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//延迟等待
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usleep((unsigned long) (1000 * 40 * play_rate)); |
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} |
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av_packet_unref(&packet); |
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} |
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//释放内存以及关闭文件
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av_free(buffer); |
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av_free(pFrameRGBA); |
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av_free(pFrame); |
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avcodec_close(pCodecCtx); |
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avformat_close_input(&pFormatCtx); |
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return 0; |
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} |
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//设置播放速率
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JNIEXPORT jint JNICALL Java_com_frank_ffmpeg_VideoPlayer_setPlayRate |
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(JNIEnv * env, jclass clazz, jfloat playRate){ |
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play_rate = playRate; |
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} |
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//获取视频总时长
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JNIEXPORT jint JNICALL Java_com_frank_ffmpeg_VideoPlayer_getDuration |
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(JNIEnv * env, jclass clazz){ |
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return duration; |
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} |
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@ -0,0 +1,16 @@ |
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package com.frank.ffmpeg; |
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/** |
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* 视频播放器 |
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* Created by frank on 2018/2/1 |
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*/ |
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public class VideoPlayer { |
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static { |
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System.loadLibrary("media-handle"); |
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} |
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public native int play(String filePath, Object surface); |
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public native int setPlayRate(float playRate); |
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} |
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@ -0,0 +1,101 @@ |
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package com.frank.ffmpeg.activity; |
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import android.os.Bundle; |
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import android.os.Environment; |
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import android.support.v7.app.AppCompatActivity; |
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import android.util.Log; |
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import android.view.SurfaceHolder; |
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import android.view.SurfaceView; |
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import android.view.View; |
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import android.widget.Button; |
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import com.frank.ffmpeg.R; |
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import com.frank.ffmpeg.VideoPlayer; |
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import java.io.File; |
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/** |
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* 使用ffmpeg播放视频 |
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* Created by frank on 2018/2/1. |
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*/ |
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public class VideoPlayerActivity extends AppCompatActivity implements SurfaceHolder.Callback { |
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private static final String TAG = MainActivity.class.getSimpleName(); |
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SurfaceHolder surfaceHolder; |
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private final static String PATH = Environment.getExternalStorageDirectory().getPath() + File.separator; |
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private String filePath = PATH + "hello.mp4"; |
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private VideoPlayer videoPlayer; |
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//播放倍率
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private float playRate = 1; |
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@Override |
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protected void onCreate(Bundle savedInstanceState) { |
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super.onCreate(savedInstanceState); |
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setContentView(R.layout.activity_video_player); |
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initView(); |
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initPlayer(); |
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} |
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private void initView(){ |
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SurfaceView surfaceView = (SurfaceView) findViewById(R.id.surface_view); |
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surfaceHolder = surfaceView.getHolder(); |
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surfaceHolder.addCallback(this); |
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Button btn_slow = (Button) findViewById(R.id.btn_slow); |
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btn_slow.setOnClickListener(new View.OnClickListener() { |
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@Override |
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public void onClick(View view) { |
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if(playRate <= 32){ |
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playRate *= 2; |
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} |
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Log.i(TAG, "playRate=" + playRate); |
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videoPlayer.setPlayRate(playRate); |
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} |
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}); |
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Button btn_fast = (Button) findViewById(R.id.btn_fast); |
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btn_fast.setOnClickListener(new View.OnClickListener() { |
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@Override |
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public void onClick(View view) { |
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if(playRate >= 1/32){ |
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playRate *= 0.5; |
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} |
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Log.i(TAG, "playRate=" + playRate); |
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videoPlayer.setPlayRate(playRate); |
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} |
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}); |
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} |
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private void initPlayer(){ |
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videoPlayer = new VideoPlayer(); |
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} |
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@Override |
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public void surfaceCreated(SurfaceHolder holder) { |
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new Thread(new Runnable() { |
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@Override |
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public void run() { |
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videoPlayer.play(filePath, surfaceHolder.getSurface()); |
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} |
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}).start(); |
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} |
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@Override |
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public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { |
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} |
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@Override |
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public void surfaceDestroyed(SurfaceHolder holder) { |
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} |
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@Override |
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protected void onDestroy() { |
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super.onDestroy(); |
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if(videoPlayer != null){ |
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videoPlayer = null; |
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} |
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} |
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} |
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@ -0,0 +1,31 @@ |
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<?xml version="1.0" encoding="utf-8"?> |
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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" |
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xmlns:tools="http://schemas.android.com/tools" |
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android:layout_width="match_parent" |
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android:layout_height="match_parent" |
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tools:context="com.frank.ffmpeg.activity.VideoPlayerActivity"> |
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<SurfaceView |
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android:id="@+id/surface_view" |
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android:layout_width="match_parent" |
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android:layout_height="match_parent" /> |
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<Button |
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android:id="@+id/btn_slow" |
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android:layout_width="wrap_content" |
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android:layout_height="wrap_content" |
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android:layout_alignParentBottom="true" |
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android:layout_alignParentStart="true" |
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android:layout_margin="16dp" |
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android:text="@string/video_slow"/> |
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<Button |
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android:id="@+id/btn_fast" |
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android:layout_width="wrap_content" |
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android:layout_height="wrap_content" |
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android:layout_alignParentBottom="true" |
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android:layout_alignParentEnd="true" |
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android:layout_margin="16dp" |
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android:text="@string/video_fast"/> |
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</RelativeLayout> |
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