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158 lines
5.4 KiB
158 lines
5.4 KiB
//
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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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#include "ffmpeg_jni_define.h"
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#define TAG "VideoPlayer"
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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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VIDEOO_PLAYER_FUNC(jint, play, jstring filePath, jobject surface){
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const char * file_name = (*env)->GetStringUTFChars(env, filePath, JNI_FALSE);
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LOGE(TAG, "open file:%s\n", file_name);
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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(TAG, "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(TAG, "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(TAG, "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(TAG, "duration==%ld", 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(TAG, "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(TAG, "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(TAG, "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(TAG, "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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VIDEOO_PLAYER_FUNC(jint, setPlayRate, 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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VIDEOO_PLAYER_FUNC(jint, getDuration){
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return duration;
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} |