ffmpeg dec中AVCodecHWConfigInternal在那里使用

news2024/9/24 1:19:39

在做ffmpeg decode插件的时候，发现需要增加一个AVCodecHWConfigInternal数组，

//就是这个数组
static const AVCodecHWConfigInternal *efcodec_hw_configs[] = {
    &(const AVCodecHWConfigInternal) {
        .public= {
            .pix_fmt     = AV_PIX_FMT_EFCCODEC,
            .methods     = AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX |
                           AV_CODEC_HW_CONFIG_METHOD_INTERNAL,
            .device_type = AV_HWDEVICE_TYPE_EFCODEC
        },
        .hwaccel = NULL,
    },
    NULL
};

#define EFCODEC_CLASS(NAME) \
    static const AVClass efcodec_ ## NAME ## _dec_class = { \
        .class_name = #NAME "_efcodec_decoder", \
        .item_name  = av_default_item_name, \
        .option     = options, \
        .version    = LIBAVUTIL_VERSION_INT, \
    };

#define EFCODECDEC(NAME, LONGNAME, CODEC, bsf_name) \
    EFCODEC_CLASS(NAME) \
    const AVCodec ff_ ## NAME ## _efcodec_decoder = { \
        .name           = #NAME "_efcodec" , \
        .long_name      = NULL_IF_CONFIG_SMALL("EFCODEC DEC " LONGNAME " decoder wrapper"), \
        .type           = AVMEDIA_TYPE_VIDEO, \
        .id             = CODEC , \
        .priv_data_size = sizeof(EFCodecDecContext_t), \
        .priv_class     = &efcodec_ ## NAME ## _dec_class, \
        .init           = efcodec_decode_init, \
        .receive_frame  = efcodec_receive_frame, \
        .close          = efcodec_decode_close, \
        .bsfs           = bsf_name, \
        .capabilities   = AV_CODEC_CAP_HARDWARE | AV_CODEC_CAP_DELAY | AV_CODEC_CAP_AVOID_PROBING, \
        .caps_internal  = FF_CODEC_CAP_SETS_PKT_DTS | FF_CODEC_CAP_INIT_CLEANUP, \
        .pix_fmts       = (const enum AVPixelFormat[]){AV_PIX_FMT_EFCCODEC,   AV_PIX_FMT_YUV420P,    \
                                                        AV_PIX_FMT_NV12,      AV_PIX_FMT_NV21,       \
                                                        AV_PIX_FMT_RGB24,     AV_PIX_FMT_RGB24P,     \
                                                        AV_PIX_FMT_BGR24,     AV_PIX_FMT_BGR24P,     \
                                                        AV_PIX_FMT_YUV444P,   AV_PIX_FMT_YUV444P10LE,\
                                                        AV_PIX_FMT_P010,      AV_PIX_FMT_P010LE,     \
                                                        AV_PIX_FMT_GRAY8,     AV_PIX_FMT_GRAY10,    AV_PIX_FMT_NONE },  \
        .hw_configs     = efcodec_hw_configs, \
        .wrapper_name   = "efcodec", \
    }

一直不清楚这个结构是做干什么用的，后来看ffmpeg.c的时候发现，实在avcodec_get_hw_config（）函数中使用：
在这里插入图片描述

const AVCodecHWConfig *avcodec_get_hw_config(const AVCodec *codec, int index)
{
    int i;
    if (!codec->hw_configs || index < 0)
        return NULL;
    for (i = 0; i <= index; i++)
        if (!codec->hw_configs[i])
            return NULL;
    return &codec->hw_configs[index]->public;
}