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translte video_player.c into English

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translte video_player.c into English
pull/166/head
xufulong 5 years ago
parent 2c65398174
commit a661a76dcc
1 changed files with 42 additions and 63 deletions
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  1. 105
      app/src/main/cpp/video_player.c

105
app/src/main/cpp/video_player.c
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@ -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;
}
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