android ffmpeg视频硬解码例子

android ffmpeg mediacodec 硬解码

ffmpeg 3.1以后 ffmpeg加入了硬解。
用法其实很简单，首先编译一个带硬解码的ffmpeg 库文件。

#!/bin/bashPLATFORM=/Users/lake/test/android-ndk-r14b/platforms/android-19/arch-arm/TOOLCHAIN=/Users/lake/test/android-ndk-r14b/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64PREFIX=./androidfunction build_one{./configure \--prefix=$PREFIX \--target-os=android \--cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \--arch=arm \--sysroot=$PLATFORM \--extra-cflags="-I$PLATFORM/usr/include" \--cc=$TOOLCHAIN/bin/arm-linux-androideabi-gcc \--nm=$TOOLCHAIN/bin/arm-linux-androideabi-nm \--disable-shared \--disable-ffmpeg \--disable-ffplay \--disable-ffprobe \--disable-ffserver \--disable-doc \--disable-symver \--enable-small \--enable-gpl \--enable-asm \--enable-jni \--enable-mediacodec \--enable-decoder=h264_mediacodec \--enable-hwaccel=h264_mediacodec \--enable-decoder=hevc_mediacodec \--enable-decoder=mpeg4_mediacodec \--enable-decoder=vp8_mediacodec \--enable-decoder=vp9_mediacodec \--enable-nonfree \--enable-version3 \--extra-cflags="-Os -fpic $ADDI_CFLAGS" \--extra-ldflags="$ADDI_LDFLAGS" \$ADDITIONAL_CONFIGURE_FLAG    make clean    make j8    make install$TOOLCHAIN/bin/arm-linux-androideabi-ld \-rpath-link=$PLATFORM/usr/lib \-L$PLATFORM/usr/lib \-L$PREFIX/lib \-soname libffmpeg.so -shared -nostdlib -Bsymbolic --whole-archive --no-undefined -o \$PREFIX/libffmpeg.so \libavcodec/libavcodec.a \libavfilter/libavfilter.a \libswresample/libswresample.a \libavformat/libavformat.a \libavutil/libavutil.a \libswscale/libswscale.a \libavdevice/libavdevice.a \libpostproc/libpostproc.a \-lc -lm -lz -ldl -llog --dynamic-linker=/system/bin/linker \$TOOLCHAIN/lib/gcc/arm-linux-androideabi/4.9.x/libgcc.a}# arm v7vfpCPU=armOPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfp -marm -march=$CPU "ADDI_CFLAGS="-marm"build_one

PLATFORM和TOOLCHAIN请用自己电脑的路径
温馨提示，请不要用as自带的ndk-bundle，因为这个自带的ndk版本是不完全的，编译会出错哦。

这个编出来是单独一个ffmpeg这个so文件有点大哈5，60mb样子

然后硬解码的代码

#include #include #include #include extern "C" {#include #include #include #include }#ifdef ANDROID#include #include #include #define LOGE(format, ...)  __android_log_print(ANDROID_LOG_ERROR, "(>_<)", format, ##__VA_ARGS__)#define LOGI(format, ...)  __android_log_print(ANDROID_LOG_INFO,  "(^_^)", format, ##__VA_ARGS__)#else#define LOGE(format, ...)  printf("(>_<) " format "\n", ##__VA_ARGS__)#define LOGI(format, ...)  printf("(^_^) " format "\n", ##__VA_ARGS__)#endifextern "C"JNIEXPORT jint JNICALL Java_com_lake_ndktest_FFmpeg_play        (JNIEnv *env, jobject obj, jstring input_jstr, jobject surface) {    LOGI("play");    // sd卡中的视频文件地址,可自行修改或者通过jni传入    const char *file_name = env->GetStringUTFChars(input_jstr, NULL);    LOGI("file_name:%s\n", file_name);    av_register_all();    AVFormatContext *pFormatCtx = avformat_alloc_context();    // Open video file    if (avformat_open_input(&pFormatCtx, file_name, NULL, NULL) != 0) {        LOGE("Couldn't open file:%s\n", file_name);        return -1; // Couldn't open file    }    // Retrieve stream information    if (avformat_find_stream_info(pFormatCtx, NULL) < 0) {        LOGE("Couldn't find stream information.");        return -1;    }    // Find the first video stream    //找到第一个视频流，因为里面的流还有可能是音频流或者其他的，我们摄像头只关心视频流    int videoStream = -1, i;    for (i = 0; i < pFormatCtx->nb_streams; i++) {        if (pFormatCtx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO            && videoStream < 0) {            videoStream = i;            break;        }    }    if (videoStream == -1) {        LOGE("Didn't find a video stream or audio steam.");        return -1; // Didn't find a video stream    }    LOGI("找到视频流");    AVCodecParameters *pCodecPar = pFormatCtx->streams[videoStream]->codecpar;    //查找解码器    //获取一个合适的编码器pCodec find a decoder for the video stream    //AVCodec *pCodec = avcodec_find_decoder(pCodecPar->codec_id);    AVCodec *pCodec;    switch (pCodecPar->codec_id){        case AV_CODEC_ID_H264:            pCodec = avcodec_find_decoder_by_name("h264_mediacodec");//硬解码264            if (pCodec == NULL) {                LOGE("Couldn't find Codec.\n");                return -1;            }            break;        case AV_CODEC_ID_MPEG4:            pCodec = avcodec_find_decoder_by_name("mpeg4_mediacodec");//硬解码mpeg4            if (pCodec == NULL) {                LOGE("Couldn't find Codec.\n");                return -1;            }            break;        case AV_CODEC_ID_HEVC:            pCodec = avcodec_find_decoder_by_name("hevc_mediacodec");//硬解码265            if (pCodec == NULL) {                LOGE("Couldn't find Codec.\n");                return -1;            }            break;        default:            pCodec = avcodec_find_decoder(pCodecPar->codec_id);//软解            if (pCodec == NULL) {                LOGE("Couldn't find Codec.\n");                return -1;            }            break;    }    LOGI("获取解码器");    //打开这个编码器，pCodecCtx表示编码器上下文，里面有流数据的信息    // Get a pointer to the codec context for the video stream    AVCodecContext *pCodecCtx = avcodec_alloc_context3(pCodec);    // Copy context    if (avcodec_parameters_to_context(pCodecCtx, pCodecPar) != 0) {        fprintf(stderr, "Couldn't copy codec context");        return -1; // Error copying codec context    }    LOGI("视频流帧率：%d fps\n", pFormatCtx->streams[videoStream]->r_frame_rate.num /                           pFormatCtx->streams[videoStream]->r_frame_rate.den);    int iTotalSeconds = (int) pFormatCtx->duration / 1000000;    int iHour = iTotalSeconds / 3600;//小时    int iMinute = iTotalSeconds % 3600 / 60;//分钟    int iSecond = iTotalSeconds % 60;//秒    LOGI("持续时间：%02d:%02d:%02d\n", iHour, iMinute, iSecond);    LOGI("视频时长：%lld微秒\n", pFormatCtx->streams[videoStream]->duration);    LOGI("持续时间：%lld微秒\n", pFormatCtx->duration);    LOGI("获取解码器SUCESS");    if (avcodec_open2(pCodecCtx, pCodec, NULL) < 0) {        LOGE("Could not open codec.");        return -1; // Could not open codec    }    LOGI("获取native window");    // 获取native window    ANativeWindow *nativeWindow = ANativeWindow_fromSurface(env, surface);    LOGI("获取视频宽高");    // 获取视频宽高    int videoWidth = pCodecCtx->width;    int videoHeight = pCodecCtx->height;    LOGI("设置native window的buffer大小,可自动拉伸");    // 设置native window的buffer大小,可自动拉伸    ANativeWindow_setBuffersGeometry(nativeWindow, videoWidth, videoHeight,                                     WINDOW_FORMAT_RGBA_8888);    ANativeWindow_Buffer windowBuffer;    LOGI("Allocate video frame");    // Allocate video frame    AVFrame *pFrame = av_frame_alloc();    LOGI("用于渲染");    // 用于渲染    AVFrame *pFrameRGBA = av_frame_alloc();    if (pFrameRGBA == NULL || pFrame == NULL) {        LOGE("Could not allocate video frame.");        return -1;    }    LOGI("Determine required buffer size and allocate buffer");    // Determine required buffer size and allocate buffer    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));    av_image_fill_arrays(pFrameRGBA->data, pFrameRGBA->linesize, buffer, AV_PIX_FMT_RGBA,                         pCodecCtx->width, pCodecCtx->height, 1);    LOGI("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");    // 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/*视频宽度*/, pCodecCtx->height/*视频高度*/,                                                pCodecCtx->pix_fmt/*像素格式*/,                                                pCodecCtx->width/*目标宽度*/,                                                pCodecCtx->height/*目标高度*/, AV_PIX_FMT_RGBA/*目标格式*/,                                                SWS_BICUBIC/*图像转换的一些算法*/, NULL, NULL, NULL);    if (sws_ctx == NULL) {        LOGE("Cannot initialize the conversion context!\n");        return -1;    }    LOGI("格式转换成功");    LOGE("开始播放");    int ret;    AVPacket packet;    while (av_read_frame(pFormatCtx, &packet) >= 0) {        // Is this a packet from the video stream?        if (packet.stream_index == videoStream) {            //该楨位置            float timestamp = packet.pts * av_q2d(pFormatCtx->streams[videoStream]->time_base);            LOGI("timestamp=%f", timestamp);            // 解码            ret = avcodec_send_packet(pCodecCtx, &packet);            if (ret < 0) {                break;            }            while (avcodec_receive_frame(pCodecCtx, pFrame) == 0) {//绘图                // lock native window buffer                ANativeWindow_lock(nativeWindow, &windowBuffer, 0);                // 格式转换                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 = (uint8_t *) windowBuffer.bits;                int dstStride = windowBuffer.stride * 4;                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, srcStride);                }                ANativeWindow_unlockAndPost(nativeWindow);            }        }        av_packet_unref(&packet);    }    LOGE("播放完成");    av_free(buffer);    av_free(pFrameRGBA);    // Free the YUV frame    av_free(pFrame);    // Close the codecs    avcodec_close(pCodecCtx);    // Close the video file    avformat_close_input(&pFormatCtx);    return 0;}jint JNI_OnLoad(JavaVM* vm, void* reserved)//这个类似android的生命周期，加载jni的时候会自己调用{    LOGI("ffmpeg JNI_OnLoad");    av_jni_set_java_vm(vm, reserved);    return JNI_VERSION_1_6;}

软解和硬解区别太大了，尤其1080p的视频，软解很慢，硬解速度非常快，质的提升啊。所以理论上手机支持硬解的视频优先硬解，不支持再调用ffmpeg的软解。

demo例子 https://github.com/lakehubo/NDKtest/tree/ffmpeg-meidacodec

android ffmpeg mediacodec 硬解码

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