package goffmpeg

/*
#include <stdlib.h>
#include "libcffmpeg.h"
*/
import "C"
import "unsafe"

// BuildDecoder build decoder
func (h *GoFFMPEG) BuildDecoder() {
	C.wrap_fn_decoder(unsafe.Pointer(libcffmpeg), h.ffmpeg)
}

// GetYUV get yuv data
func (h *GoFFMPEG) GetYUV() ([]byte, int, int, int64) {
	var fid C.long
	var length C.int
	var srcW, srcH, srcF C.int

	var yuv *C.uchar
	r := C.wrap_fn_decoder_pic(unsafe.Pointer(libcffmpeg), h.ffmpeg, &yuv, &srcW, &srcH, &srcF, &length, &fid)

	if r < 0 {
		return nil, int(r), int(r), int64(r)
	}

	if yuv == nil || length == 0 || srcW == 0 || srcH == 0 {
		return nil, 0, 0, 0
	}

	defer C.free(unsafe.Pointer(yuv))

	return C.GoBytes(unsafe.Pointer(yuv), length), int(srcW), int(srcH), int64(fid)
}

// GetYUV2 get yuv data
func (h *GoFFMPEG) GetYUV2() (unsafe.Pointer, []byte, int, int, int64) {
	var fid C.long
	var length C.int
	var srcW, srcH, srcF C.int

	var yuv *C.uchar
	r := C.wrap_fn_decoder_pic(unsafe.Pointer(libcffmpeg), h.ffmpeg, &yuv, &srcW, &srcH, &srcF, &length, &fid)

	if r < 0 {
		return nil, nil, int(r), int(r), int64(r)
	}

	if yuv == nil || length == 0 || srcW == 0 || srcH == 0 {
		return nil, nil, 0, 0, 0
	}

	const maxLen = 0x7fffffff
	size := int(length)
	data := (*[maxLen]byte)(unsafe.Pointer(yuv))[:size:size]

	return unsafe.Pointer(yuv), data, int(srcW), int(srcH), int64(fid)
}

// SetDecMinDuration min duration
// 主要是如果解码文件时长太短，可能在sdk收到解码数据前解码进程运行结束，所以设定一个最短的duration
func (h *GoFFMPEG) SetDecMinDuration(min, max int) {
	C.wrap_fn_rec_duration(unsafe.Pointer(libcffmpeg), h.ffmpeg, C.int(min), C.int(max))
}