C++ 如何将位图作为帧写入C\C+中的Ogg Theora+；？
如何在C\C++中将位图作为帧写入Ogg Theora 一些源代码示例如下！） 这是和C++ 如何将位图作为帧写入C\C+中的Ogg Theora+；？,c++,c,ogg-theora,C++,C,Ogg Theora,如何在C\C++中将位图作为帧写入Ogg Theora 一些源代码示例如下！） 这是和 下面是一个演示如何使用theora二进制文件的示例。当编码器读取原始、未压缩的“yuv4mpeg”视频数据时，您也可以通过将视频帧传输到编码器来从应用程序中使用这些数据。整个解决方案在这里作为代码示例发布有点长，但如果您从Xiph.org下载liborea，则有一个示例png2theora。我将要提到的所有库函数都可以在Xiph.org上的theora和ogg文档中找到 调用th_info_init（）初始化
下面是一个演示如何使用theora二进制文件的示例。当编码器读取原始、未压缩的“yuv4mpeg”视频数据时，您也可以通过将视频帧传输到编码器来从应用程序中使用这些数据。整个解决方案在这里作为代码示例发布有点长，但如果您从Xiph.org下载liborea，则有一个示例png2theora。我将要提到的所有库函数都可以在Xiph.org上的theora和ogg文档中找到
int theora_write_frame(int outputFd, unsigned long w, unsigned long h, unsigned char *yuv_y, unsigned char *yuv_u, unsigned char *yuv_v, int last)
{
th_ycbcr_buffer ycbcr;
ogg_packet op;
ogg_page og;
unsigned long yuv_w;
unsigned long yuv_h;
/* Must hold: yuv_w >= w */
yuv_w = (w + 15) & ~15;
/* Must hold: yuv_h >= h */
yuv_h = (h + 15) & ~15;
//Fill out the ycbcr buffer
ycbcr[0].width = yuv_w;
ycbcr[0].height = yuv_h;
ycbcr[0].stride = yuv_w;
ycbcr[1].width = yuv_w;
ycbcr[1].stride = ycbcr[1].width;
ycbcr[1].height = yuv_h;
ycbcr[2].width = ycbcr[1].width;
ycbcr[2].stride = ycbcr[1].stride;
ycbcr[2].height = ycbcr[1].height;
if(encoderInfo->pixel_fmt == TH_PF_420)
{
//Chroma is decimated by 2 in both directions
ycbcr[1].width = yuv_w >> 1;
ycbcr[2].width = yuv_w >> 1;
ycbcr[1].height = yuv_h >> 1;
ycbcr[2].height = yuv_h >> 1;
}else if(encoderInfo->pixel_fmt == TH_PF_422)
{
ycbcr[1].width = yuv_w >> 1;
ycbcr[2].width = yuv_w >> 1;
}else if(encoderInfo->pixel_fmt != TH_PF_422)
{
//Then we have an unknown pixel format
//We don't know how long the arrays are!
fprintf(stderr, "[theora_write_frame] Unknown pixel format in writeFrame!\n");
return -1;
}
ycbcr[0].data = yuv_y;
ycbcr[1].data = yuv_u;
ycbcr[2].data = yuv_v;
/* Theora is a one-frame-in,one-frame-out system; submit a frame
for compression and pull out the packet */
if(th_encode_ycbcr_in(encoderContext, ycbcr)) {
fprintf(stderr, "[theora_write_frame] Error: could not encode frame\n");
return -1;
}
if(!th_encode_packetout(encoderContext, last, &op)) {
fprintf(stderr, "[theora_write_frame] Error: could not read packets\n");
return -1;
}
ogg_stream_packetin(&theoraStreamState, &op);
ssize_t bytesWritten = 0;
int pagesOut = 0;
while(ogg_stream_pageout(&theoraStreamState, &og)) {
pagesOut ++;
bytesWritten = write(outputFd, og.header, og.header_len);
if(bytesWritten != og.header_len)
{
fprintf(stderr, "[theora_write_frame] Error: Could not write to file\n");
return -1;
}
bytesWritten = write(outputFd, og.body, og.body_len);
if(bytesWritten != og.body_len)
{
bytesWritten = fprintf(stderr, "[theora_write_frame] Error: Could not write to file\n");
return -1;
}
}
return pagesOut;
}