我是Android界的新手,我必须在Android上编写流式视频质量检查应用程序。我必须使用原生StageFright媒体框架来播放视频。据我所知,有一个渲染统计的原生API,但我需要建议如何获得它。谢谢。
答案 0 :(得分:0)
有一个ADB命令可以打印播放帧率。
<强>程序强>
在主机上的Windows(或Linux)上打开控制台。确保已安装所需的驱动程序,以便与设备(Android手机或主板)进行USB连接
运行以下命令
$> adb kill-server
$> adb shell setprop debug.video.showfps 1
运行视频播放。如果使用Android Media Player堆栈运行视频,则会看到报告帧速率达到的打印件。
答案 1 :(得分:0)
欢迎您使用它,在每个渲染帧的开头和结尾调用它。这是来自NDK的一些示例代码的略微修改版本:
stats.c:
#include <sys/time.h>
#include <string.h>
#include <android/log.h>
#include <stdio.h>
#include "stats.h"
#define LOG_TAG "[STATS]"
#define LOGI(...) __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)
#define LOGW(...) __android_log_print(ANDROID_LOG_WARN,LOG_TAG,__VA_ARGS__)
#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR,LOG_TAG,__VA_ARGS__)
#define STATS_DUMP(...) __android_
double now_ms()
{
struct timeval tv;
gettimeofday(&tv, NULL);
return tv.tv_sec*1000. + tv.tv_usec/1000.;
}
void stats_init(Stats* s)
{
s->lastTime = now_ms();
s->firstTime = 0.;
s->firstFrame = 0;
s->numFrames = 0;
s->dump = malloc(128);
memset(s->dump,0,128);
}
void stats_startFrame(Stats* s)
{
s->frameTime = now_ms();
}
void stats_endFrame(Stats* s)
{
double now = now_ms();
double renderTime = now - s->frameTime;
double frameTime = now - s->lastTime;
int nn;
if (now - s->firstTime >= MAX_PERIOD_MS) {
if (s->numFrames > 0) {
double renderTime = now - s->frameTime;
double frameTime = now - s->lastTime;
int nn;
double minRender, maxRender, avgRender;
double minFrame, maxFrame, avgFrame;
int count;
nn = s->firstFrame;
minRender = maxRender = avgRender = s->frames[nn].renderTime;
minFrame = maxFrame = avgFrame = s->frames[nn].frameTime;
for (count = s->numFrames; count > 0; count-- ) {
nn += 1;
if (nn >= MAX_FRAME_STATS)
nn -= MAX_FRAME_STATS;
double render = s->frames[nn].renderTime;
if (render < minRender) minRender = render;
if (render > maxRender) maxRender = render;
double frame = s->frames[nn].frameTime;
if (frame < minFrame) minFrame = frame;
if (frame > maxFrame) maxFrame = frame;
avgRender += render;
avgFrame += frame;
}
avgRender /= s->numFrames;
avgFrame /= s->numFrames;
sprintf(s->dump,"Frames per second - [AVG:%.1f] [MIN:%.1f] [MAX:%.1f]Rendering time ms - [AVG:%.1f] [MIN:%.1f] [MAX:%.1f]", 1000./avgFrame, 1000./maxFrame, 1000./minFrame, avgRender, minRender, maxRender);
//LOGI("Frames per second - [AVG:%.1f] [MIN:%.1f] [MAX:%.1f]Rendering time ms - [AVG:%.1f] [MIN:%.1f] [MAX:%.1f]", 1000./avgFrame, 1000./maxFrame, 1000./minFrame, avgRender, minRender, maxRender);
}
s->numFrames = 0;
s->firstFrame = 0;
s->firstTime = now;
}
nn = s->firstFrame + s->numFrames;
if (nn >= MAX_FRAME_STATS)
nn -= MAX_FRAME_STATS;
s->frames[nn].renderTime = renderTime;
s->frames[nn].frameTime = frameTime;
if (s->numFrames < MAX_FRAME_STATS) {
s->numFrames += 1;
} else {
s->firstFrame += 1;
if (s->firstFrame >= MAX_FRAME_STATS)
s->firstFrame -= MAX_FRAME_STATS;
}
s->lastTime = now;
}
stats.h:
#include <jni.h>
#define MAX_FRAME_STATS 120
#define MAX_PERIOD_MS 5000
typedef struct{
double renderTime;
double frameTime;
} FrameStats;
typedef struct{
double firstTime;
double lastTime;
double frameTime;
int firstFrame;
int numFrames;
FrameStats frames[ MAX_FRAME_STATS ];
char* dump;
} Stats;
extern double now_ms();
extern void stats_init(Stats *);
extern int stats_dump(Stats *);
extern void stats_startFrame(Stats *);
extern void stats_endFrame(Stats *);