android平台下基于ffmpeg和ANativeWindow实现简单的视频播放器

音视频实践学习

• android全平台编译ffmpeg以及x264与fdk-aac实践
• ubuntu下使用nginx和nginx-rtmp-module配置直播推流服务器
• android全平台编译ffmpeg合并为单个库实践
• android-studio使用cmake编译ffmpeg实践
• android全平台下基于ffmpeg解码MP4视频文件为YUV文件
• android全平台编译ffmpeg支持命令行实践
• android全平台基于ffmpeg解码本地MP4视频推流到RTMP服务器
• android平台下音频编码之编译LAME库转码PCM为MP3
• ubuntu平台下编译vlc-android视频播放器实践
• 图解YU12、I420、YV12、NV12、NV21、YUV420P、YUV420SP、YUV422P、YUV444P的区别
• 图解RGB565、RGB555、RGB16、RGB24、RGB32、ARGB32等格式的区别
• YUV420P、YUV420SP、NV12、NV21和RGB互相转换并存储为JPEG以及PNG图片
• android全平台编译libyuv库实现YUV和RGB的转换
• android平台下基于ffmpeg对相机采集的NV21数据编码为MP4视频文件
• android平台下基于ffmpeg采集Camera数据编码成H.264推流到RTMP服务器
• android平台下基于ffmpeg和ANativeWindow实现简单的视频播放器

概述

本节内容旨在了解本地视频的解码播放过程&＃xff0c;暂时不设计音频的解码同步播放操作。

流程分析

工程实践

新建工程ffmpeg-single-play

定义java层的播放类&＃xff1a;

package com.onzhou.ffmpeg.player;public class NativePlayer {static {System.loadLibrary("native-player");}public native int playVideo(String videoPath, Object surface);}


定义好本地的播放器头文件&＃xff1a;native_play.h

class NativePlayer {private:int width &＃61; 0;int height &＃61; 0;int bufferSize &＃61; 0;int videoIndex &＃61; -1;AVPacket *vPacket &＃61; NULL;AVFrame *vFrame &＃61; NULL, *pFrameRGBA &＃61; NULL;AVCodecContext *vCodecCtx &＃61; NULL;SwsContext *sws_ctx &＃61; NULL;AVFormatContext *pFormatCtx &＃61; NULL;uint8_t *out_buffer &＃61; NULL;ANativeWindow_Buffer windowBuffer;AVCodec *vCodec &＃61; NULL;public:int PlayVideo(const char *input_str, ANativeWindow *nativeWindow);};


定义相关的实现类文件&＃xff1a;native_play.cpp

int NativePlayer::PlayVideo(const char *input_str, ANativeWindow *nativeWindow) {//1.初始化所有组件av_register_all();//分配一个AVFormatContext结构pFormatCtx &＃61; avformat_alloc_context();//2.打开输入文件if (avformat_open_input(&pFormatCtx, input_str, NULL, NULL) !&＃61; 0) {LOGE("Could not open input stream");goto end_line;}//3.查找文件的流信息if (avformat_find_stream_info(pFormatCtx, NULL) < 0) {LOGE("Could not find stream information");goto end_line;}//4.查找视频轨for (int index &＃61; 0; index < pFormatCtx->nb_streams; index&＃43;&＃43;) {if (pFormatCtx->streams[index]->codecpar->codec_type &＃61;&＃61; AVMEDIA_TYPE_VIDEO) {videoIndex &＃61; index;break;}}if (videoIndex &＃61;&＃61; -1) {LOGE("Could not find a video stream");goto end_line;}//5.查找解码器vCodec &＃61; avcodec_find_decoder(pFormatCtx->streams[videoIndex]->codecpar->codec_id);if (vCodec &＃61;&＃61; NULL) {LOGE("could not find codec");goto end_line;}//6.配置解码器vCodecCtx &＃61; avcodec_alloc_context3(vCodec);avcodec_parameters_to_context(vCodecCtx, pFormatCtx->streams[videoIndex]->codecpar);//7.打开解码器if (avcodec_open2(vCodecCtx, vCodec, NULL) < 0) {LOGE("Could not open codec");goto end_line;}width &＃61; vCodecCtx->width;height &＃61; vCodecCtx->height;//分配一个帧指针&＃xff0c;指向解码后的原始帧vFrame &＃61; av_frame_alloc();vPacket &＃61; (AVPacket *) av_malloc(sizeof(AVPacket));pFrameRGBA &＃61; av_frame_alloc();//绑定输出bufferbufferSize &＃61; av_image_get_buffer_size(AV_PIX_FMT_RGBA, width, height, 1);out_buffer &＃61; (uint8_t *) av_malloc(bufferSize * sizeof(uint8_t));av_image_fill_arrays(pFrameRGBA->data, pFrameRGBA->linesize, out_buffer, AV_PIX_FMT_RGBA,width, height, 1);sws_ctx &＃61; sws_getContext(width, height, vCodecCtx->pix_fmt,width, height, AV_PIX_FMT_RGBA, SWS_BICUBIC, NULL, NULL, NULL);//默认为RGB565if (ANativeWindow_setBuffersGeometry(nativeWindow, width, height, WINDOW_FORMAT_RGBA_8888) <0) {LOGE("Could not set buffers geometry");ANativeWindow_release(nativeWindow);goto end_line;}//读取帧while (av_read_frame(pFormatCtx, vPacket) >&＃61; 0) {if (vPacket->stream_index &＃61;&＃61; videoIndex) {//视频解码if (avcodec_send_packet(vCodecCtx, vPacket) !&＃61; 0) {return -1;}while (avcodec_receive_frame(vCodecCtx, vFrame) &＃61;&＃61; 0) {//转化格式sws_scale(sws_ctx, (const uint8_t *const *) vFrame->data, vFrame->linesize,0,vCodecCtx->height,pFrameRGBA->data, pFrameRGBA->linesize);if (ANativeWindow_lock(nativeWindow, &windowBuffer, NULL) < 0) {LOGE("cannot lock window");} else {//逐行复制uint8_t *bufferBits &＃61; (uint8_t *) windowBuffer.bits;for (int h &＃61; 0; h < height; h&＃43;&＃43;) {memcpy(bufferBits &＃43; h * windowBuffer.stride * 4,out_buffer &＃43; h * pFrameRGBA->linesize[0],pFrameRGBA->linesize[0]);}ANativeWindow_unlockAndPost(nativeWindow);}}}av_packet_unref(vPacket);}//释放内存sws_freeContext(sws_ctx);end_line:av_free(vPacket);av_free(pFrameRGBA);avcodec_close(vCodecCtx);avformat_close_input(&pFormatCtx);return 0;
}


最终播放效果如下&＃xff1a;

项目地址&＃xff1a;ffmpeg-single-play
https://github.com/byhook/ffmpeg4android