ffmpeg从内存中读取数据错误（在做一个RTMP视频服务器，需要将内存中的包直接转码）

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在av_format_open_input()打开数据时，多次调用回调函数read_buffer()直至内存溢出

#include "Decode.h"     
#include <iostream>
#include <winerror.h>

using namespace std;

namespace Transcode
{
	Decode::Decode()
	{
		avio_in = NULL;
		inbuffer = NULL;
		packet = NULL;
		frame = NULL;
		dec_ctx = NULL;
		piFmt = NULL;
		av_register_all();											//注册所有编解码器，复用器和解复用器
		ifmt_ctx = avformat_alloc_context();					
	}

	int read_buffer(void *opaque, uint8_t *buf, int buf_size)
	{
		//int ret = -1;
		if (opaque != NULL)
		{
			av_log(NULL,AV_LOG_INFO,"buf_size:%i\n",buf_size);
			memcpy(buf, opaque, buf_size);
			opaque = NULL;
			return buf_size;
		}
		return -1;
	}


	int Decode::decode(int buf_size, const uint8_t *packet)
	{
		int ret;
		int i = 0;
		inbuffer = (unsigned char*)av_malloc(buf_size);            //为输入缓冲区间分配内存

		uint8_t *decodeBuffer = (uint8_t*)av_malloc(buf_size);
		memcpy(decodeBuffer, packet, buf_size);
		/*open input file*/
		av_log(NULL, AV_LOG_INFO, "buf_size1:%i\n", buf_size);
		avio_in = avio_alloc_context(inbuffer, buf_size, 0, decodeBuffer, read_buffer, NULL, NULL);

		if (avio_in == NULL)
			return 0;
		ifmt_ctx->pb = avio_in;

		// Determine the input-format:

		av_probe_input_buffer(avio_in, &piFmt, "", NULL, 0, 0);                            //探测流格式
		ifmt_ctx->flags = AVFMT_FLAG_CUSTOM_IO;                                          //通过标志位说明采用自定义AVIOContext
                //此处报内存错误
		if ((ret = avformat_open_input(&ifmt_ctx, "whatever", NULL, NULL)) < 0) {     
			av_log(NULL, AV_LOG_ERROR, "Cannot open input file\n");
			return ret;
		}
		if ((ret = avformat_find_stream_info(ifmt_ctx, NULL)) < 0) {					
			av_log(NULL, AV_LOG_ERROR, "Cannot find stream information\n");
			return ret;
		}
		printf("***nb_stream%d \n", ifmt_ctx->nb_streams);
		for (i = 0; i < ifmt_ctx->nb_streams; i++) {     
			AVStream *stream;
			AVCodecContext *codec_ctx;
			stream = ifmt_ctx->streams[i];
			codec_ctx = stream->codec;                    
			INFO("nb_stream:",i)
			/* Reencode video & audio and remux subtitles etc. */
			if (codec_ctx->codec_type == AVMEDIA_TYPE_VIDEO){       / 
				printf("video stream\n");
				/* Open decoder */
				ret = avcodec_open2(codec_ctx,						
					avcodec_find_decoder(codec_ctx->codec_id), NULL);    
				if (ret < 0) {
					av_log(NULL, AV_LOG_ERROR, "Failed to open decoder for stream #%u\n", i);
					return ret;
				}
			}
			if (codec_ctx->codec_type == AVMEDIA_TYPE_AUDIO)
				INFO("audio stream:")
		}
		return 1;
	}