让ffmpeg支持RMVB解码

已经编译好的ffmpeg库不用改，把这段代码写在一个c文件，加到调用ffmpeg的工程。
在调用完av_register_all()后调用register_rm_binary_codec，注册rm的解码器
不过有几点注意：
1、原代码中g_hInstance变量实际上是不需要的。GetModuleFileName的第一个参数可以为NULL
if (rvdec->frame.data[0])
avctx->release_buffer(avctx, &rvdec->frame);
if(avctx->get_buffer(avctx, &rvdec->frame) < 0){
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
#endif
#include "./libavcodec/avcodec.h"
#include <stdio.h>
#include <string.h>
#ifdef WIN32
typedef HRESULT (WINAPI *PRVCustomMessage)(void*, uint32_t);
代码也可以参考mplayer，它的代码还包含了Linux下解码的部分
http://svn.mplayerhq.hu/mplayer/trunk/libmpcodecs/vd_realvid.c?view=markup
/***************************************************************
void ResizeRow(uint8_t* pIn, uint32_t wi, uint32_t dpi, uint8_t* pOut, uint32_t wo, uint32_t dpo);
void Resize(uint8_t* pIn, uint32_t wi, uint32_t hi, uint8_t* pOut, uint32_t wo, uint32_t ho);
{
if(wi == wo) memcpy(pOut, pIn, wo);
else ResizeRow(pIn, wi, 1, pOut, wo, 1);
}
}
void ResizeHeight(uint8_t* pIn, uint32_t wi, uint32_t hi, uint8_t* pOut, uint32_t wo, uint32_t ho)
ResizeHeight(pOut + so, wo/2, hi/2, pIn + so, wo/2, ho/2);
ResizeHeight(pOut + so + so/4, wo/2, hi/2, pIn + so + so/4, wo/2, ho/2);
}
return -1;
}
以及RealVideoDecoderClose()函数中
if (rvdec->frame.data[0])
avctx->release_buffer(avctx, &rvdec->frame);
这两段代码是多余的，要删除。而且这样写会引起堆出错
if(wi == wo) return;
//ASSERT(0); // this is uncreachable code, but anyway... looks nice being so symmetric
ResizeWidth(pOut, wi, ho, pIn, wo, ho);
PRVFree RVFree;
PRVInit RVInit;
PRVTransform RVTransform;
#ifdef WIN32
HMODULE m_hDrvDll;
#else
void *m_hDrvDll;
#endif
uint32_t m_dwCookie;
让ffmpeg支持RMVB解码
参考的代码在
/viewthread.php?tid=2406
/index.php?title=%E9%99%A4%E4%BA%86%E7%94%A8avisynth%2C%E8%BF%98%E6%9C%89%E6%94%AF%E6%8C%81rmvb%E7%9A%84%E6%96%B9%E6%B3%95%E5%90%97%3F&oldid=325
else if(hi < ho)
{
ResizeHeight(pIn, wi, hi, pOut, wo, ho);
ResizeHeight(pIn + si, wi/2, hi/2, pOut + so, wo/2, ho/2);
ResizeHeight(pIn + si + si/4, wi/2, hi/2, pOut + so + so/4, wo/2, ho/2);
if(dpo == 1)
{
for( i = 0, j = 0, dj = (wi<<16)/wo; i < wo-1; i++, pOut++, j += dj)
uint8_t *m_pI420;
uint8_t *m_pI420Temp;
AVFrame frame;
}RealVideoDecContext;
//FIXME: redundant?
static uint32_t rm_swap(unsigned int x)
{
#else
typedef unsigned long (*PRVCustomMessage)(void*, uint32_t);
typedef unsigned long (*PRVFree)(uint32_t);
typedef unsigned long (*PRVInit)(void*, uint32_t* dwCookie);
* @file realvideocodec.c
* rmvideo decoder using the RealNetwork Binary DLLs
* பைடு நூலகம்
* Implementation of RealNetwork video interface wrapper for FFmpeg
* Created by [email=dev@]dev@[/email],2007/04/25--2007/05/02
}
void ResizeWidth(uint8_t* pIn, uint32_t wi, uint32_t hi, uint8_t* pOut, uint32_t wo, uint32_t ho)
{
uint32_t y;
for( y = 0; y < hi; y++, pIn += wi, pOut += wo)
ResizeWidth(pIn + si + si/4, wi/2, hi/2, pOut + so + so/4, wo/2, ho/2);
if(hi == ho) return;
ResizeHeight(pOut, wo, hi, pIn, wo, ho);
2、把GetModuleFileName改为GetModuleFileNameA，LoadLibrary改为LoadLibraryA，确保UNICODE版本的程序也可以正确运行。
3、RealVideoDecoderTransform()函数中
len = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
void ResizeWidth(uint8_t* pIn, uint32_t wi, uint32_t hi, uint8_t* pOut, uint32_t wo, uint32_t ho);
typedef struct RealVideoDecContext
{
PRVCustomMessage RVCustomMessage;
typedef unsigned long (*PRVTransform)(uint8_t*, uint8_t*, void*, void*, uint32_t);
#endif
void ResizeHeight(uint8_t* pIn, uint32_t wi, uint32_t hi, uint8_t* pOut, uint32_t wo, uint32_t ho);
x = ((x<<8)&0xFF00FF00) | ((x>>8)&0x00FF00FF);
x = (x>>16) | (x<<16);
return x;
}
void Resize(uint8_t* pIn, uint32_t wi, uint32_t hi, uint8_t* pOut, uint32_t wo, uint32_t ho)
}
}
void ResizeRow(uint8_t* pIn, uint32_t wi, uint32_t dpi, uint8_t* pOut, uint32_t wo, uint32_t dpo)
{
//ASSERT(wi < wo);