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ijkplayer源码---FFPlayer结构体5 IJKFF_Pipeline

ijkplayer源代码文章索引_qq_15255121的专栏-CSDN博客

struct IJKFF_Pipeline *pipeline;

struct IJKFF_Pipeline {
    SDL_Class             *opaque_class;
    IJKFF_Pipeline_Opaque *opaque;

    void            (*func_destroy)             (IJKFF_Pipeline *pipeline);
    IJKFF_Pipenode *(*func_open_video_decoder)  (IJKFF_Pipeline *pipeline, FFPlayer *ffp);
    SDL_Aout       *(*func_open_audio_output)   (IJKFF_Pipeline *pipeline, FFPlayer *ffp);
    IJKFF_Pipenode *(*func_init_video_decoder)  (IJKFF_Pipeline *pipeline, FFPlayer *ffp);
    int           (*func_config_video_decoder)  (IJKFF_Pipeline *pipeline, FFPlayer *ffp);
};

opaque_class

我们先看下   SDL_Class             *opaque_class;

我们看到

static SDL_Class g_pipeline_class = {
    .name = "ffpipeline_android_media",
};

IJKFF_Pipeline *ffpipeline_create_from_android(FFPlayer *ffp)
{
    ALOGD("ffpipeline_create_from_android()\n");
    IJKFF_Pipeline *pipeline = ffpipeline_alloc(&g_pipeline_class, sizeof(IJKFF_Pipeline_Opaque));
    if (!pipeline)
        return pipeline;

    IJKFF_Pipeline_Opaque *opaque = pipeline->opaque;
    opaque->ffp                   = ffp;
    opaque->surface_mutex         = SDL_CreateMutex();
    opaque->left_volume           = 1.0f;
    opaque->right_volume          = 1.0f;
    if (!opaque->surface_mutex) {
        ALOGE("ffpipeline-android:create SDL_CreateMutex failed\n");
        goto fail;
    }

    pipeline->func_destroy              = func_destroy;
    pipeline->func_open_video_decoder   = func_open_video_decoder;
    pipeline->func_open_audio_output    = func_open_audio_output;
    pipeline->func_init_video_decoder   = func_init_video_decoder;
    pipeline->func_config_video_decoder = func_config_video_decoder;

    return pipeline;
fail:
    ffpipeline_free_p(&pipeline);
    return NULL;
}


IJKFF_Pipeline *ffpipeline_alloc(SDL_Class *opaque_class, size_t opaque_size)
{
    IJKFF_Pipeline *pipeline = (IJKFF_Pipeline*) calloc(1, sizeof(IJKFF_Pipeline));
    if (!pipeline)
        return NULL;

    pipeline->opaque_class = opaque_class;
    pipeline->opaque       = calloc(1, opaque_size);
    if (!pipeline->opaque) {
        free(pipeline);
        return NULL;
    }

    return pipeline;
}

可以知道是ffpipeline_android_media

IJKFF_Pipeline_Opaque

IJKFF_Pipeline_Opaque *opaque;

typedef struct IJKFF_Pipeline_Opaque {
    FFPlayer      *ffp; //最上层的FFPlayer
    SDL_mutex     *surface_mutex; //surface锁
    jobject        jsurface; //surface 
    volatile bool  is_surface_need_reconfigure;//是否需要重新设置

    bool         (*mediacodec_select_callback)(void *opaque, ijkmp_mediacodecinfo_context *mcc);
    void          *mediacodec_select_callback_opaque;

    SDL_Vout      *weak_vout; //视频输出 弱引用

    float          left_volume; //最小音量
    float          right_volume; //最高音量
} IJKFF_Pipeline_Opaque;

mediacodec_select_callback是什么呢？

static void
IjkMediaPlayer_native_setup(JNIEnv *env, jobject thiz, jobject weak_this)
{
    MPTRACE("%s\n", __func__);
    IjkMediaPlayer *mp = ijkmp_android_create(message_loop);
    JNI_CHECK_GOTO(mp, env, "java/lang/OutOfMemoryError", "mpjni: native_setup: ijkmp_create() failed", LABEL_RETURN);

    jni_set_media_player(env, thiz, mp);
    ijkmp_set_weak_thiz(mp, (*env)->NewGlobalRef(env, weak_this));
    ijkmp_set_inject_opaque(mp, ijkmp_get_weak_thiz(mp));
    ijkmp_set_ijkio_inject_opaque(mp, ijkmp_get_weak_thiz(mp));
    ijkmp_android_set_mediacodec_select_callback(mp, mediacodec_select_callback, ijkmp_get_weak_thiz(mp));

LABEL_RETURN:
    ijkmp_dec_ref_p(&mp);
}


void ijkmp_android_set_mediacodec_select_callback(IjkMediaPlayer *mp, bool (*callback)(void *opaque, ijkmp_mediacodecinfo_context *mcc), void *opaque)
{
    if (!mp)
        return;

    MPTRACE("ijkmp_android_set_mediacodec_select_callback()");
    pthread_mutex_lock(&mp->mutex);

    if (mp && mp->ffplayer && mp->ffplayer->pipeline) {
        ffpipeline_set_mediacodec_select_callback(mp->ffplayer->pipeline, callback, opaque);
    }

    pthread_mutex_unlock(&mp->mutex);
    MPTRACE("ijkmp_android_set_mediacodec_select_callback()=void");
}


void ffpipeline_set_mediacodec_select_callback(IJKFF_Pipeline* pipeline, bool (*callback)(void *opaque, ijkmp_mediacodecinfo_context *mcc), void *opaque)
{
    ALOGD("%s\n", __func__);
    if (!check_ffpipeline(pipeline, __func__))
        return;

    pipeline->opaque->mediacodec_select_callback        = callback;
    pipeline->opaque->mediacodec_select_callback_opaque = opaque;
}

我们看到mediacodec_select_callback是ijkplayer/android/ijkplayer_jni.c中的

static bool mediacodec_select_callback(void *opaque, ijkmp_mediacodecinfo_context *mcc)
{
    JNIEnv *env = NULL;
    jobject weak_this = (jobject) opaque;
    const char *found_codec_name = NULL;

    if (JNI_OK != SDL_JNI_SetupThreadEnv(&env)) {
        ALOGE("%s: SetupThreadEnv failed\n", __func__);
        return -1;
    }

    found_codec_name = J4AC_IjkMediaPlayer__onSelectCodec__withCString__asCBuffer(env, weak_this, mcc->mime_type, mcc->profile, mcc->level, mcc->codec_name, sizeof(mcc->codec_name));
    if (J4A_ExceptionCheck__catchAll(env) || !found_codec_name) {
        ALOGE("%s: onSelectCodec failed\n", __func__);
        goto fail;
    }

fail:
    return found_codec_name;
}

通过上面代码可以知道最后调用了IjkMediaPlayer.java的

@CalledByNative
private static String onSelectCodec(Object weakThiz, String mimeType, int profile, int level) {
    if (weakThiz == null || !(weakThiz instanceof WeakReference<?>))
        return null;

    @SuppressWarnings("unchecked")
    WeakReference<IjkMediaPlayer> weakPlayer = (WeakReference<IjkMediaPlayer>) weakThiz;
    IjkMediaPlayer player = weakPlayer.get();
    if (player == null)
        return null;

    OnMediaCodecSelectListener listener = player.mOnMediaCodecSelectListener;
    if (listener == null)
        listener = DefaultMediaCodecSelector.sInstance;

    return listener.onMediaCodecSelect(player, mimeType, profile, level);
}




public static class DefaultMediaCodecSelector implements OnMediaCodecSelectListener {
    public static final DefaultMediaCodecSelector sInstance = new DefaultMediaCodecSelector();

    @SuppressWarnings("deprecation")
    @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
    public String onMediaCodecSelect(IMediaPlayer mp, String mimeType, int profile, int level) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN)
            return null;

        if (TextUtils.isEmpty(mimeType))
            return null;

        Log.i(TAG, String.format(Locale.US, "onSelectCodec: mime=%s, profile=%d, level=%d", mimeType, profile, level));
        ArrayList<IjkMediaCodecInfo> candidateCodecList = new ArrayList<IjkMediaCodecInfo>();
        int numCodecs = MediaCodecList.getCodecCount();
        for (int i = 0; i < numCodecs; i++) {
            MediaCodecInfo codecInfo = MediaCodecList.getCodecInfoAt(i);
            Log.d(TAG, String.format(Locale.US, "  found codec: %s", codecInfo.getName()));
            if (codecInfo.isEncoder())
                continue;

            String[] types = codecInfo.getSupportedTypes();
            if (types == null)
                continue;

            for(String type: types) {
                if (TextUtils.isEmpty(type))
                    continue;

                Log.d(TAG, String.format(Locale.US, "    mime: %s", type));
                if (!type.equalsIgnoreCase(mimeType))
                    continue;

                IjkMediaCodecInfo candidate = IjkMediaCodecInfo.setupCandidate(codecInfo, mimeType);
                if (candidate == null)
                    continue;

                candidateCodecList.add(candidate);
                Log.i(TAG, String.format(Locale.US, "candidate codec: %s rank=%d", codecInfo.getName(), candidate.mRank));
                candidate.dumpProfileLevels(mimeType);
            }
        }

        if (candidateCodecList.isEmpty()) {
            return null;
        }

        IjkMediaCodecInfo bestCodec = candidateCodecList.get(0);

        for (IjkMediaCodecInfo codec : candidateCodecList) {
            if (codec.mRank > bestCodec.mRank) {
                bestCodec = codec;
            }
        }

        if (bestCodec.mRank < IjkMediaCodecInfo.RANK_LAST_CHANCE) {
            Log.w(TAG, String.format(Locale.US, "unaccetable codec: %s", bestCodec.mCodecInfo.getName()));
            return null;
        }

        Log.i(TAG, String.format(Locale.US, "selected codec: %s rank=%d", bestCodec.mCodecInfo.getName(), bestCodec.mRank));
        return bestCodec.mCodecInfo.getName();
    }
}

返回的是解码器的名字，进而最后如果有名字返回true，没名字返回false。

    ijkmp_android_set_mediacodec_select_callback(mp, mediacodec_select_callback, ijkmp_get_weak_thiz(mp));

这句话同时告诉我们mediacodec_select_callback_opaque是java层的

IjkMediaPlayer

func_init_video_decoder

static IJKFF_Pipenode *func_init_video_decoder(IJKFF_Pipeline *pipeline, FFPlayer *ffp)
{
    IJKFF_Pipeline_Opaque *opaque = pipeline->opaque;
    IJKFF_Pipenode        *node = NULL;

    if (ffp->mediacodec_all_videos || ffp->mediacodec_avc || ffp->mediacodec_hevc || ffp->mediacodec_mpeg2)
        node = ffpipenode_init_decoder_from_android_mediacodec(ffp, pipeline, opaque->weak_vout);

    return node;
}

创建decoder解码器

func_config_video_decoder

static int func_config_video_decoder(IJKFF_Pipeline *pipeline, FFPlayer *ffp)
{
    IJKFF_Pipeline_Opaque *opaque = pipeline->opaque;
    int                       ret = NULL;

    if (ffp->node_vdec) {
        ret = ffpipenode_config_from_android_mediacodec(ffp, pipeline, opaque->weak_vout, ffp->node_vdec);
    }

    return ret;
}

设置解码器参数

func_open_video_decoder

static IJKFF_Pipenode *func_open_video_decoder(IJKFF_Pipeline *pipeline, FFPlayer *ffp)
{
    IJKFF_Pipeline_Opaque *opaque = pipeline->opaque;
    IJKFF_Pipenode        *node = NULL;

    if (ffp->mediacodec_all_videos || ffp->mediacodec_avc || ffp->mediacodec_hevc || ffp->mediacodec_mpeg2)
        node = ffpipenode_create_video_decoder_from_android_mediacodec(ffp, pipeline, opaque->weak_vout);
    if (!node) {
        node = ffpipenode_create_video_decoder_from_ffplay(ffp);
    }

    return node;
}

打开解码器，并开始工作

func_open_audio_output

static SDL_Aout *func_open_audio_output(IJKFF_Pipeline *pipeline, FFPlayer *ffp)
{
    SDL_Aout *aout = NULL;
    if (ffp->opensles) {
        aout = SDL_AoutAndroid_CreateForOpenSLES();
    } else {
        aout = SDL_AoutAndroid_CreateForAudioTrack();
    }
    if (aout)
        SDL_AoutSetStereoVolume(aout, pipeline->opaque->left_volume, pipeline->opaque->right_volume);
    return aout;
}

下面两篇文章对理解，上面方法的调用以及硬解码有帮组。

Android解码API

Android手机直播（四）Android Media API - 简书

硬解码使用的

ijkplayer 解码实现分析——硬解篇 - 知乎

悦读

道可道，非常道；名可名，非常名。 无名，天地之始，有名，万物之母。 故常无欲，以观其妙，常有欲，以观其徼。 此两者，同出而异名，同谓之玄，玄之又玄，众妙之门。

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