Android MediaMetadataRetriever取视频封面，Kotlin（1）

Android MediaMetadataRetriever取视频封面，Kotlin（1）

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_MEDIA_IMAGES" />
    <uses-permission android:name="android.permission.READ_MEDIA_VIDEO" />

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="@android:color/white"
    android:padding="1px">

    <ImageView
        android:id="@+id/image"
        android:layout_width="match_parent"
        android:layout_height="180px"
        android:background="@android:color/darker_gray"
        android:scaleType="centerCrop" />

</LinearLayout>

import android.content.ContentUris
import android.content.Context
import android.net.Uri
import android.os.Bundle
import android.provider.MediaStore
import android.util.Log
import androidx.appcompat.app.AppCompatActivity
import androidx.lifecycle.lifecycleScope
import androidx.recyclerview.widget.GridLayoutManager
import androidx.recyclerview.widget.RecyclerView
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch


class MainActivity : AppCompatActivity() {
    companion object {
        const val TAG = "fly"

        const val SPAN_COUNT = 9
        const val VIDEO = 1
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val rv = findViewById<RecyclerView>(R.id.rv)

        val layoutManager = GridLayoutManager(this, SPAN_COUNT)
        layoutManager.orientation = GridLayoutManager.VERTICAL
        rv.layoutManager = layoutManager

        val adapter = MyAdapter(this)

        rv.adapter = adapter
        rv.layoutManager = layoutManager

        val ctx = this
        lifecycleScope.launch(Dispatchers.IO) {
            val videoList = readAllVideo(ctx)

            Log.d(TAG, "readAllVideo size=${videoList.size}")

            val lists = arrayListOf<MyData>()
            lists.addAll(videoList)

            lifecycleScope.launch(Dispatchers.Main) {
                adapter.dataChanged(lists)
            }
        }
    }

    private fun readAllVideo(ctx: Context): ArrayList<MyData> {
        val videos = ArrayList<MyData>()

        //读取视频Video
        val cursor = ctx.contentResolver.query(
            MediaStore.Video.Media.EXTERNAL_CONTENT_URI,
            null,
            null,
            null,
            null
        )

        while (cursor!!.moveToNext()) {
            //路径
            val path = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.DATA))

            val id = cursor.getColumnIndex(MediaStore.Images.ImageColumns._ID)
            val videoUri: Uri = ContentUris.withAppendedId(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, cursor.getLong(id))

            //名称
            //val name = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.DISPLAY_NAME))

            //大小
            //val size = cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.SIZE))

            videos.add(MyData(videoUri, path, VIDEO))
        }

        cursor.close()

        return videos
    }
}

import android.content.Context
import android.graphics.Bitmap
import android.media.MediaMetadataRetriever
import android.util.Log
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ImageView
import androidx.appcompat.app.AppCompatActivity
import androidx.collection.LruCache
import androidx.lifecycle.lifecycleScope
import androidx.recyclerview.widget.RecyclerView
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch
import kotlinx.coroutines.withContext


class MyAdapter : RecyclerView.Adapter<MyAdapter.VideoHolder> {
    private var mCtx: Context? = null
    private var mItems = ArrayList<MyData>()

    private var mFailItemCount = 0
    private var mSuccessItemCount = 0
    private var mTotalCostTime = 0L
    private val mCache = LruCache<String, Bitmap?>(1000)
    private var mIsDecoderCompleted = false

    constructor(ctx: Context) : super() {
        mCtx = ctx
    }

    fun dataChanged(items: ArrayList<MyData>) {
        this.mItems = items

        mSuccessItemCount = 0
        mTotalCostTime = 0
        mFailItemCount = 0

        notifyDataSetChanged()

        (mCtx as AppCompatActivity).lifecycleScope.launch(Dispatchers.IO) {
            mIsDecoderCompleted = false

            mItems.forEachIndexed { idx, data ->
                var bmp: Bitmap? = mCache[data.toString()]
                if (bmp == null) {
                    bmp = getSysMMRBmp(data)

                    if (bmp != null) {
                        mCache.put(data.toString(), bmp)
                    }

                    (mCtx as AppCompatActivity).lifecycleScope.launch(Dispatchers.Main) {
                        notifyItemChanged(idx)
                    }
                }
            }

            mIsDecoderCompleted = true
            withContext(Dispatchers.Main) {
                notifyDataSetChanged()
            }
        }
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): VideoHolder {
        val v = LayoutInflater.from(mCtx).inflate(R.layout.image_layout, null, false)
        return VideoHolder(v)
    }

    override fun onBindViewHolder(holder: VideoHolder, position: Int) {
        loadVideoCover(mItems[position], holder.image)
    }

    override fun getItemCount(): Int {
        return mItems.size
    }

    class VideoHolder : RecyclerView.ViewHolder {
        var image: ImageView? = null

        constructor(itemView: View) : super(itemView) {
            image = itemView.findViewById<ImageView>(R.id.image)
            image?.setImageResource(android.R.drawable.ic_menu_gallery)
        }
    }

    private fun getSysMMRBmp(data: MyData): Bitmap? {
        val sysMMR = MediaMetadataRetriever()

        var bmp: Bitmap? = null
        val t = System.currentTimeMillis()
        try {
            sysMMR.setDataSource(data.path)
            bmp = sysMMR.frameAtTime

            mSuccessItemCount++

            Log.d(
                MainActivity.TAG,
                "android MMR：total success item count=$mSuccessItemCount"
            )
        } catch (e: Exception) {
            Log.e(MainActivity.TAG, "android MMR: total fail item count=${mFailItemCount++} , ${e.message}:$data")
        } finally {
            try {
                sysMMR.release()
                sysMMR.close()
            } catch (exc: Exception) {
                Log.e(MainActivity.TAG, "$exc")
            }
        }

        val costTime = System.currentTimeMillis() - t
        mTotalCostTime = mTotalCostTime + costTime
        Log.d(MainActivity.TAG, "android MMR：total cost time= $mTotalCostTime ms")

        return bmp
    }

    private fun loadVideoCover(data: MyData, image: ImageView?) {
        val bmp: Bitmap? = mCache[data.toString()]
        if (bmp != null) {
            image?.setImageBitmap(bmp)
        } else {
            if (mIsDecoderCompleted) {
                image?.setImageResource(android.R.drawable.stat_notify_error)
            }
        }
    }
}

import android.net.Uri

open class MyData {
    var uri: Uri? = null
    var path: String? = null
    var lastModified = 0L
    var width = 0
    var height = 0

    var position = -1
    var type = -1  //-1未知。1，普通图。2，视频。

    constructor(uri: Uri?, path: String?, type: Int = -1) {
        this.uri = uri
        this.path = path
        this.type = type
    }

    override fun toString(): String {
        return "MyData(uri=$uri, path=$path, lastModified=$lastModified, width=$width, height=$height, position=$position, type=$type)"
    }

    override fun equals(other: Any?): Boolean {
        return (this.toString()) == other.toString()
    }
}

MediaMetadataRetriever抽帧的耗时太长，对于异常或者超规格的视频，基本上10+秒。通常5、6秒。

500个超规格、残破视频，解码耗时和成功率情况：

android MMR: total fail item count=110

android MMR：total success item count=389

android MMR：total cost time= 198679 ms

3分钟+，500个视频才解码完，成功解码389个，解码失败110个。（0开始计数）

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