ijkplayer源码---FFPlayer结构体6

struct IJKFF_Pipenode *node_vdec;

struct IJKFF_Pipenode {
    SDL_mutex *mutex;
    void *opaque;

    void (*func_destroy) (IJKFF_Pipenode *node);
    int  (*func_run_sync)(IJKFF_Pipenode *node);
    int  (*func_flush)   (IJKFF_Pipenode *node); // optional
};

通过ijkplayer源码---解码（decode）_qq_15255121的专栏-CSDN博客 我们大致了解到node_vdec就是解码器

static int stream_component_open(FFPlayer *ffp, int stream_index)
{
	case AVMEDIA_TYPE_VIDEO:
        is->video_stream = stream_index;
        is->video_st = ic->streams[stream_index];

        if (ffp->async_init_decoder) {
            while (!is->initialized_decoder) {
                SDL_Delay(5);
            }
            if (ffp->node_vdec) {
                is->viddec.avctx = avctx;
                ret = ffpipeline_config_video_decoder(ffp->pipeline, ffp);
            }
            if (ret || !ffp->node_vdec) {
                decoder_init(&is->viddec, avctx, &is->videoq, is->continue_read_thread);
                ffp->node_vdec = ffpipeline_open_video_decoder(ffp->pipeline, ffp);
                if (!ffp->node_vdec)
                    goto fail;
            }
        } else {
            decoder_init(&is->viddec, avctx, &is->videoq, is->continue_read_thread);
            ffp->node_vdec = ffpipeline_open_video_decoder(ffp->pipeline, ffp);
            if (!ffp->node_vdec)
                goto fail;
        }

}

通过上面我们知道ffp->node_vdec = ffpipeline_open_video_decoder(ffp->pipeline, ffp);

IJKFF_Pipenode* ffpipeline_open_video_decoder(IJKFF_Pipeline *pipeline, FFPlayer *ffp)
{
    return pipeline->func_open_video_decoder(pipeline, ffp);
}

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;
}

通过这篇文章ijkplayer源码---FFPlayer结构体5 IJKFF_Pipeline_qq_15255121的专栏-CSDN博客 我们可以知道node_vdec就是视频解码器

char *video_codec_info;

char *audio_codec_info;

char *subtitle_codec_info;

void ffp_set_video_codec_info(FFPlayer *ffp, const char *module, const char *codec)
{
    av_freep(&ffp->video_codec_info);
    ffp->video_codec_info = av_asprintf("%s, %s", module ? module : "", codec ? codec : "");
    av_log(ffp, AV_LOG_INFO, "VideoCodec: %s\n", ffp->video_codec_info);
}

void ffp_set_audio_codec_info(FFPlayer *ffp, const char *module, const char *codec)
{
    av_freep(&ffp->audio_codec_info);
    ffp->audio_codec_info = av_asprintf("%s, %s", module ? module : "", codec ? codec : "");
    av_log(ffp, AV_LOG_INFO, "AudioCodec: %s\n", ffp->audio_codec_info);
}

void ffp_set_subtitle_codec_info(FFPlayer *ffp, const char *module, const char *codec)
{
    av_freep(&ffp->subtitle_codec_info);
    ffp->subtitle_codec_info = av_asprintf("%s, %s", module ? module : "", codec ? codec : "");
    av_log(ffp, AV_LOG_INFO, "SubtitleCodec: %s\n", ffp->subtitle_codec_info);
}

IJKFF_Pipenode *ffpipenode_create_video_decoder_from_android_mediacodec(FFPlayer *ffp, IJKFF_Pipeline *pipeline, SDL_Vout *vout){
    .....
ffp_set_video_codec_info(ffp, MEDIACODEC_MODULE_NAME, opaque->mcc.codec_name);
.....
}

opaque->mcc.codec_name从哪里来的呢？

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;
}

IJKFF_Pipenode *ffpipenode_create_video_decoder_from_android_mediacodec(FFPlayer *ffp, IJKFF_Pipeline *pipeline, SDL_Vout *vout)
{
        IJKFF_Pipenode *node = ffpipenode_alloc(sizeof(IJKFF_Pipenode_Opaque));

        opaque->mcc.profile = opaque->codecpar->profile;
        opaque->mcc.level   = opaque->codecpar->level;
            if (!ffpipeline_select_mediacodec_l(pipeline, &opaque->mcc) || !opaque->mcc.codec_name[0]) {
        ALOGE("amc: no suitable codec\n");
        goto fail;
    }
        ffp_set_video_codec_info(ffp, MEDIACODEC_MODULE_NAME, opaque->mcc.codec_name);

}

bool ffpipeline_select_mediacodec_l(IJKFF_Pipeline* pipeline, ijkmp_mediacodecinfo_context *mcc)
{
    ALOGD("%s\n", __func__);
    if (!check_ffpipeline(pipeline, __func__))
        return false;

    if (!mcc || !pipeline->opaque->mediacodec_select_callback)
        return false;

    return pipeline->opaque->mediacodec_select_callback(pipeline->opaque->mediacodec_select_callback_opaque, mcc);
}

通过https://blog.csdn.net/qq_15255121/article/details/123280252?spm=1001.2014.3001.5502

我们知道上层调用了

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) {

以及下面的赋值代码

#define J4AC_IjkMediaPlayer__onSelectCodec__withCString__asCBuffer J4AC_tv_danmaku_ijk_media_player_IjkMediaPlayer__onSelectCodec__withCString__asCBuffer


const char *J4AC_tv_danmaku_ijk_media_player_IjkMediaPlayer__onSelectCodec__withCString__asCBuffer(JNIEnv *env, jobject weakThiz, const char *mimeType_cstr__, jint profile, jint level, char *out_buf, int out_len)
{
    const char *ret_value = NULL;
    const char *c_str     = NULL;
    jstring local_string = J4AC_tv_danmaku_ijk_media_player_IjkMediaPlayer__onSelectCodec__withCString(env, weakThiz, mimeType_cstr__, profile, level);
    if (J4A_ExceptionCheck__throwAny(env) || !local_string) {
        goto fail;
    }

    c_str = (*env)->GetStringUTFChars(env, local_string, NULL );
    if (J4A_ExceptionCheck__throwAny(env) || !c_str) {
        goto fail;
    }

    strlcpy(out_buf, c_str, out_len);
    ret_value = out_buf;

fail:
    J4A_ReleaseStringUTFChars__p(env, local_string, &c_str);
    J4A_DeleteLocalRef__p(env, &local_string);
    return ret_value;
}

out_buf就是我们我们的mcc.codec_name

audio和subtitle相对比较简单

#define AVCODEC_MODULE_NAME    "avcodec"



ffp_set_audio_codec_info(ffp, AVCODEC_MODULE_NAME, avcodec_get_name(avctx->codec_id));


ffp_set_subtitle_codec_info(ffp, AVCODEC_MODULE_NAME, avcodec_get_name(avctx->codec_id));