diff --git a/app/src/main/cpp/video_player.c b/app/src/main/cpp/video_player.c index 4447742..8ba996b 100644 --- a/app/src/main/cpp/video_player.c +++ b/app/src/main/cpp/video_player.c @@ -14,131 +14,112 @@ #define TAG "VideoPlayer" -//播放倍率 float play_rate = 1; -//视频总时长 long duration = 0; -VIDEO_PLAYER_FUNC(jint, play, jstring filePath, jobject surface){ +VIDEO_PLAYER_FUNC(jint, play, jstring filePath, jobject surface) { - const char * file_name = (*env)->GetStringUTFChars(env, filePath, JNI_FALSE); + const char *file_name = (*env)->GetStringUTFChars(env, filePath, JNI_FALSE); LOGE(TAG, "open file:%s\n", file_name); - //注册所有组件 av_register_all(); - //分配上下文 - AVFormatContext * pFormatCtx = avformat_alloc_context(); - //打开视频文件 - if(avformat_open_input(&pFormatCtx, file_name, NULL, NULL)!=0) { + AVFormatContext *pFormatCtx = avformat_alloc_context(); + if (avformat_open_input(&pFormatCtx, file_name, NULL, NULL) != 0) { LOGE(TAG, "Couldn't open file:%s\n", file_name); return -1; } - //检索多媒体流信息 - if(avformat_find_stream_info(pFormatCtx, NULL)<0) { + if (avformat_find_stream_info(pFormatCtx, NULL) < 0) { LOGE(TAG, "Couldn't find stream information."); return -1; } - //寻找视频流的第一帧 int videoStream = -1, i; for (i = 0; i < pFormatCtx->nb_streams; i++) { if (pFormatCtx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO - && videoStream < 0) { + && videoStream < 0) { videoStream = i; } } - if(videoStream==-1) { + if (videoStream == -1) { LOGE(TAG, "couldn't find a video stream."); return -1; } - //获取视频总时长 + //get duration of video if (pFormatCtx->duration != AV_NOPTS_VALUE) { - duration = (long) (pFormatCtx->duration / AV_TIME_BASE); + duration = (long) (pFormatCtx->duration / AV_TIME_BASE); LOGE(TAG, "duration==%ld", duration); } - //获取codec上下文指针 - AVCodecContext * pCodecCtx = pFormatCtx->streams[videoStream]->codec; - //寻找视频流的解码器 - AVCodec * pCodec = avcodec_find_decoder(pCodecCtx->codec_id); - if(pCodec==NULL) { + AVCodecContext *pCodecCtx = pFormatCtx->streams[videoStream]->codec; + AVCodec *pCodec = avcodec_find_decoder(pCodecCtx->codec_id); + if (pCodec == NULL) { LOGE(TAG, "couldn't find Codec."); return -1; } - if(avcodec_open2(pCodecCtx, pCodec, NULL) < 0) { + if (avcodec_open2(pCodecCtx, pCodec, NULL) < 0) { LOGE(TAG, "Couldn't open codec."); return -1; } - // 获取native window - ANativeWindow* nativeWindow = ANativeWindow_fromSurface(env, surface); - // 获取视频宽高 + + ANativeWindow *nativeWindow = ANativeWindow_fromSurface(env, surface); int videoWidth = pCodecCtx->width; int videoHeight = pCodecCtx->height; - // 设置native window的buffer大小,可自动拉伸 - ANativeWindow_setBuffersGeometry(nativeWindow, videoWidth, videoHeight, WINDOW_FORMAT_RGBA_8888); + ANativeWindow_setBuffersGeometry(nativeWindow, videoWidth, videoHeight, + WINDOW_FORMAT_RGBA_8888); ANativeWindow_Buffer windowBuffer; - if(avcodec_open2(pCodecCtx, pCodec, NULL)<0) { + if (avcodec_open2(pCodecCtx, pCodec, NULL) < 0) { LOGE(TAG, "Couldn't open codec."); return -1; } - //申请内存 - AVFrame * pFrame = av_frame_alloc(); - AVFrame * pFrameRGBA = av_frame_alloc(); - if(pFrameRGBA == NULL || pFrame == NULL) { + AVFrame *pFrame = av_frame_alloc(); + AVFrame *pFrameRGBA = av_frame_alloc(); + if (pFrameRGBA == NULL || pFrame == NULL) { LOGE(TAG, "Couldn't allocate video frame."); return -1; } - // buffer中数据用于渲染,且格式为RGBA - int numBytes=av_image_get_buffer_size(AV_PIX_FMT_RGBA, pCodecCtx->width, pCodecCtx->height, 1); + int numBytes = av_image_get_buffer_size(AV_PIX_FMT_RGBA, pCodecCtx->width, pCodecCtx->height, + 1); - uint8_t * buffer=(uint8_t *)av_malloc(numBytes*sizeof(uint8_t)); + uint8_t *buffer = (uint8_t *) av_malloc(numBytes * sizeof(uint8_t)); av_image_fill_arrays(pFrameRGBA->data, pFrameRGBA->linesize, buffer, AV_PIX_FMT_RGBA, pCodecCtx->width, pCodecCtx->height, 1); - // 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 struct SwsContext *sws_ctx = sws_getContext(pCodecCtx->width, - pCodecCtx->height, - pCodecCtx->pix_fmt, - pCodecCtx->width, - pCodecCtx->height, - AV_PIX_FMT_RGBA, - SWS_BILINEAR, - NULL, - NULL, - NULL); + pCodecCtx->height, + pCodecCtx->pix_fmt, + pCodecCtx->width, + pCodecCtx->height, + AV_PIX_FMT_RGBA, + SWS_BILINEAR, + NULL, + NULL, + NULL); int frameFinished; AVPacket packet; - while(av_read_frame(pFormatCtx, &packet)>=0) { - //判断是否为视频流 - if(packet.stream_index==videoStream) { - //对该帧进行解码 + while (av_read_frame(pFormatCtx, &packet) >= 0) { + if (packet.stream_index == videoStream) { avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished, &packet); if (frameFinished) { // lock native window ANativeWindow_lock(nativeWindow, &windowBuffer, 0); - // 格式转换 - sws_scale(sws_ctx, (uint8_t const * const *)pFrame->data, + sws_scale(sws_ctx, (uint8_t const *const *) pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameRGBA->data, pFrameRGBA->linesize); - // 获取stride - uint8_t * dst = windowBuffer.bits; + uint8_t *dst = windowBuffer.bits; int dstStride = windowBuffer.stride * 4; - uint8_t * src = pFrameRGBA->data[0]; + uint8_t *src = pFrameRGBA->data[0]; int srcStride = pFrameRGBA->linesize[0]; - // 由于window的stride和帧的stride不同,因此需要逐行复制 int h; for (h = 0; h < videoHeight; h++) { memcpy(dst + h * dstStride, src + h * srcStride, (size_t) srcStride); } ANativeWindow_unlockAndPost(nativeWindow); } - //延迟等待 usleep((unsigned long) (1000 * 40 * play_rate)); } av_packet_unref(&packet); } - //释放内存以及关闭文件 av_free(buffer); av_free(pFrameRGBA); av_free(pFrame); @@ -147,12 +128,10 @@ VIDEO_PLAYER_FUNC(jint, play, jstring filePath, jobject surface){ return 0; } -//设置播放速率 -VIDEO_PLAYER_FUNC(void, setPlayRate, jfloat playRate){ - play_rate = playRate; +VIDEO_PLAYER_FUNC(void, setPlayRate, jfloat playRate) { + play_rate = playRate; } -//获取视频总时长 -VIDEO_PLAYER_FUNC(jint, getDuration){ - return duration; +VIDEO_PLAYER_FUNC(jint, getDuration) { + return duration; } \ No newline at end of file