opt.c

来自「播放H264文件的播放器」· C语言 代码 · 共 471 行 · 第 1/2 页

    return av_set_number(obj, name, 1, 1, n);
}

/**
 *
 * @param buf a buffer which is used for returning non string values as strings, can be NULL
 * @param buf_len allocated length in bytes of buf
 */
const char *av_get_string(void *obj, const char *name, const AVOption **o_out, char *buf, int buf_len){
    const AVOption *o= av_find_opt(obj, name, NULL, 0, 0);
    void *dst;
    uint8_t *bin;
    int len, i;
    if(!o || o->offset<=0)
        return NULL;
    if(o->type != FF_OPT_TYPE_STRING && (!buf || !buf_len))
        return NULL;

    dst= ((uint8_t*)obj) + o->offset;
    if(o_out) *o_out= o;

    switch(o->type){
    case FF_OPT_TYPE_FLAGS:     snprintf(buf, buf_len, "0x%08X",*(int    *)dst);break;
    case FF_OPT_TYPE_INT:       snprintf(buf, buf_len, "%d" , *(int    *)dst);break;
    case FF_OPT_TYPE_INT64:     snprintf(buf, buf_len, "%"PRId64, *(int64_t*)dst);break;
    case FF_OPT_TYPE_FLOAT:     snprintf(buf, buf_len, "%f" , *(float  *)dst);break;
    case FF_OPT_TYPE_DOUBLE:    snprintf(buf, buf_len, "%f" , *(double *)dst);break;
    case FF_OPT_TYPE_RATIONAL:  snprintf(buf, buf_len, "%d/%d", ((AVRational*)dst)->num, ((AVRational*)dst)->den);break;
    case FF_OPT_TYPE_STRING:    return *(void**)dst;
    case FF_OPT_TYPE_BINARY:
        len = *(int*)(((uint8_t *)dst) + sizeof(uint8_t *));
        if(len >= (buf_len + 1)/2) return NULL;
        bin = *(uint8_t**)dst;
        for(i = 0; i < len; i++) snprintf(buf + i*2, 3, "%02X", bin[i]);
        break;
    default: return NULL;
    }
    return buf;
}

static int av_get_number(void *obj, const char *name, const AVOption **o_out, double *num, int *den, int64_t *intnum){
    const AVOption *o= av_find_opt(obj, name, NULL, 0, 0);
    void *dst;
    if(!o || o->offset<=0)
        goto error;

    dst= ((uint8_t*)obj) + o->offset;

    if(o_out) *o_out= o;

    switch(o->type){
    case FF_OPT_TYPE_FLAGS:     *intnum= *(unsigned int*)dst;return 0;
    case FF_OPT_TYPE_INT:       *intnum= *(int    *)dst;return 0;
    case FF_OPT_TYPE_INT64:     *intnum= *(int64_t*)dst;return 0;
    case FF_OPT_TYPE_FLOAT:     *num=    *(float  *)dst;return 0;
    case FF_OPT_TYPE_DOUBLE:    *num=    *(double *)dst;return 0;
    case FF_OPT_TYPE_RATIONAL:  *intnum= ((AVRational*)dst)->num;
                                *den   = ((AVRational*)dst)->den;
                                                        return 0;
    }
error:
    *den=*intnum=0;
    return -1;
}

double av_get_double(void *obj, const char *name, const AVOption **o_out){
    int64_t intnum=1;
    double num=1;
    int den=1;

    av_get_number(obj, name, o_out, &num, &den, &intnum);
    return num*intnum/den;
}

AVRational av_get_q(void *obj, const char *name, const AVOption **o_out){
    int64_t intnum=1;
    double num=1;
    int den=1;

    av_get_number(obj, name, o_out, &num, &den, &intnum);
    if(num == 1.0 && (int)intnum == intnum)
	{
		AVRational Ret;
		Ret.num = intnum;
		Ret.den = den;
        return Ret;//(AVRational){intnum, den};
	}
    else
        return av_d2q(num*intnum/den, 1<<24);
}

int64_t av_get_int(void *obj, const char *name, const AVOption **o_out){
    int64_t intnum=1;
    double num=1;
    int den=1;

    av_get_number(obj, name, o_out, &num, &den, &intnum);
    return num*intnum/den;
}

static void opt_list(void *obj, void *av_log_obj, const char *unit)
{
    const AVOption *opt=NULL;

    while((opt= av_next_option(obj, opt))){
        if(!(opt->flags & (AV_OPT_FLAG_ENCODING_PARAM|AV_OPT_FLAG_DECODING_PARAM)))
            continue;

        /* Don't print CONST's on level one.
         * Don't print anything but CONST's on level two.
         * Only print items from the requested unit.
         */
        if (!unit && opt->type==FF_OPT_TYPE_CONST)
            continue;
        else if (unit && opt->type!=FF_OPT_TYPE_CONST)
            continue;
        else if (unit && opt->type==FF_OPT_TYPE_CONST && strcmp(unit, opt->unit))
            continue;
        else if (unit && opt->type == FF_OPT_TYPE_CONST)
            av_log(av_log_obj, AV_LOG_INFO, "   %-15s ", opt->name);
        else
            av_log(av_log_obj, AV_LOG_INFO, "-%-17s ", opt->name);

        switch( opt->type )
        {
            case FF_OPT_TYPE_FLAGS:
                av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<flags>" );
                break;
            case FF_OPT_TYPE_INT:
                av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<int>" );
                break;
            case FF_OPT_TYPE_INT64:
                av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<int64>" );
                break;
            case FF_OPT_TYPE_DOUBLE:
                av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<double>" );
                break;
            case FF_OPT_TYPE_FLOAT:
                av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<float>" );
                break;
            case FF_OPT_TYPE_STRING:
                av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<string>" );
                break;
            case FF_OPT_TYPE_RATIONAL:
                av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<rational>" );
                break;
            case FF_OPT_TYPE_BINARY:
                av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "<binary>" );
                break;
            case FF_OPT_TYPE_CONST:
            default:
                av_log( av_log_obj, AV_LOG_INFO, "%-7s ", "" );
                break;
        }
        av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_ENCODING_PARAM) ? 'E' : '.');
        av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_DECODING_PARAM) ? 'D' : '.');
        av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_VIDEO_PARAM   ) ? 'V' : '.');
        av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_AUDIO_PARAM   ) ? 'A' : '.');
        av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_SUBTITLE_PARAM) ? 'S' : '.');

        if(opt->help)
            av_log(av_log_obj, AV_LOG_INFO, " %s", opt->help);
        av_log(av_log_obj, AV_LOG_INFO, "\n");
        if (opt->unit && opt->type != FF_OPT_TYPE_CONST) {
            opt_list(obj, av_log_obj, opt->unit);
        }
    }
}

int av_opt_show(void *obj, void *av_log_obj){
    if(!obj)
        return -1;

    av_log(av_log_obj, AV_LOG_INFO, "%s AVOptions:\n", (*(AVClass**)obj)->class_name);

    opt_list(obj, av_log_obj, NULL);

    return 0;
}

/** Set the values of the AVCodecContext or AVFormatContext structure.
 * They are set to the defaults specified in the according AVOption options
 * array default_val field.
 *
 * @param s AVCodecContext or AVFormatContext for which the defaults will be set
 */
void av_opt_set_defaults2(void *s, int mask, int flags)
{
    const AVOption *opt = NULL;
    while ((opt = av_next_option(s, opt)) != NULL) {
        if((opt->flags & mask) != flags)
            continue;
        switch(opt->type) {
            case FF_OPT_TYPE_CONST:
                /* Nothing to be done here */
            break;
            case FF_OPT_TYPE_FLAGS:
            case FF_OPT_TYPE_INT: {
                int val;
                val = opt->default_val;
                av_set_int(s, opt->name, val);
            }
            break;
            case FF_OPT_TYPE_INT64:
                if((double)(opt->default_val+0.6) == opt->default_val)
                    av_log(s, AV_LOG_DEBUG, "loss of precission in default of %s\n", opt->name);
                av_set_int(s, opt->name, opt->default_val);
            break;
            case FF_OPT_TYPE_FLOAT: {
                double val;
                val = opt->default_val;
                av_set_double(s, opt->name, val);
            }
            break;
            case FF_OPT_TYPE_RATIONAL: {
                AVRational val;
                val = av_d2q(opt->default_val, INT_MAX);
                av_set_q(s, opt->name, val);
            }
            break;
            case FF_OPT_TYPE_STRING:
            case FF_OPT_TYPE_BINARY:
                /* Cannot set default for string as default_val is of type * double */
            break;
            default:
                av_log(s, AV_LOG_DEBUG, "AVOption type %d of option %s not implemented yet\n", opt->type, opt->name);
        }
    }
}

void av_opt_set_defaults(void *s){
    av_opt_set_defaults2(s, 0, 0);
}