YV12，I420，YUV420P的区别与格式转换
YV12和I420的区别
一般来说，直接采集到的视频数据是RGB24的格式，RGB24一帧的大小size＝width×heigth×3 Bit，RGB32的size＝width×heigth×4，如果是I420（即YUV标准格式4：2：0）的数据量是 size＝width×heigth×1.5 Bit。
在采集到RGB24数据后，需要对这个格式的数据进行第一次压缩。即将图像的颜色空间由RGB2YUV。因为，X264在进行编码的时候需要标准的YUV（4：2：0）。但是这里需要注意的是，虽然YV12也是（4：2：0），但是YV12和I420的却是不同的，在存储空间上面有些区别。如下：
YV12 ： 亮度（行×列） ＋ V（行×列/4) + U（行×列/4）
I420 ： 亮度（行×列） ＋ U（行×列/4) + V（行×列/4）
可以看出，YV12和I420基本上是一样的，就是UV的顺序不同。
继续我们的话题，经过第一次数据压缩后RGB24－>YUV（I420）。这样，数据量将减少一半，为什么呢？呵呵，这个就太基础了，我就不多写了。同样，如果是RGB24－>YUV（YV12），也是减少一半。但是，虽然都是一半，如果是YV12的话效果就有很大损失。然后，经过X264编码后，数据量将大大减少。将编码后的数据打包，通过RTP实时传送。到达目的地后，将数据取出，进行解码。完成解码后，数据仍然是YUV格式的，所以，还需要一次转换，这样windows的驱动才可以处理，就是YUV2RGB24。
附一个YUV播放器的源代码： http://download.csdn.net/detail/leixiaohua1020/6374065
查看YUV的时候也可以下载使用成熟的YUV播放器 ——YUV Player Deluxe： http://www.yuvplayer.com/
yuv420p就是I420格式，使用极其广泛，它的示意图：
在采集到RGB24数据后，需要对这个格式的数据进行第一次压缩。即将图像的颜色空间由RGB2YUV。因为，X264在进行编码的时候需要标准的YUV（4：2：0）。但是这里需要注意的是，虽然YV12也是（4：2：0），但是YV12和I420的却是不同的，在存储空间上面有些区别。如下：
YV12 ： 亮度（行×列） ＋ V（行×列/4) + U（行×列/4）
I420 ： 亮度（行×列） ＋ U（行×列/4) + V（行×列/4）
可以看出，YV12和I420基本上是一样的，就是UV的顺序不同。
继续我们的话题，经过第一次数据压缩后RGB24－>YUV（I420）。这样，数据量将减少一半，为什么呢？呵呵，这个就太基础了，我就不多写了。同样，如果是RGB24－>YUV（YV12），也是减少一半。但是，虽然都是一半，如果是YV12的话效果就有很大损失。然后，经过X264编码后，数据量将大大减少。将编码后的数据打包，通过RTP实时传送。到达目的地后，将数据取出，进行解码。完成解码后，数据仍然是YUV格式的，所以，还需要一次转换，这样windows的驱动才可以处理，就是YUV2RGB24。
FFMPEG中的swscale提供了视频原始数据（YUV420，YUV422，YUV444，RGB24...）之间的转换，分辨率变换等操作，使用起来十分方便，在这里记录一下它的用法。
swscale主要用于在2个AVFrame之间进行转换。
下面来看一个视频解码的简单例子，这个程序完成了对"北京移动开发者大会茶歇视频2.flv"（其实就是优酷上的一个普通视频）的解码工作，并将解码后的数据保存为原始数据文件（例如YUV420，YUV422，RGB24等等）。其中略去了很多的代码。
注：完整代码在文章：100行代码实现最简单的基于FFMPEG+SDL的视频播放器
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- //ffmpeg simple player
- //
- //媒资检索系统子系统
- //
- //2013 雷霄骅 [email protected]
- //中国传媒大学/数字电视技术
- //
- #include "stdafx.h"
- int _tmain(int argc, _TCHAR* argv[])
- {
- AVFormatContext *pFormatCtx;
- int i, videoindex;
- AVCodecContext *pCodecCtx;
- AVCodec *pCodec;
- char filepath[]="北京移动开发者大会茶歇视频2.flv";
- av_register_all();
- avformat_network_init();
- pFormatCtx = avformat_alloc_context();
- if(avformat_open_input(&pFormatCtx,filepath,NULL,NULL)!=0){
- printf("无法打开文件\n");
- return -1;
- }
- ......
- AVFrame *pFrame,*pFrameYUV;
- pFrame=avcodec_alloc_frame();
- pFrameYUV=avcodec_alloc_frame();
- uint8_t *out_buffer;
- out_buffer=new uint8_t[avpicture_get_size(PIX_FMT_RGB24, pCodecCtx->width, pCodecCtx->height)];
- avpicture_fill((AVPicture *)pFrameYUV, out_buffer, PIX_FMT_RGB24, pCodecCtx->width, pCodecCtx->height);
- /*
- out_buffer=new uint8_t[avpicture_get_size(PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height)];
- avpicture_fill((AVPicture *)pFrameYUV, out_buffer, PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height);*/
- /*
- out_buffer=new uint8_t[avpicture_get_size(PIX_FMT_UYVY422, pCodecCtx->width, pCodecCtx->height)];
- avpicture_fill((AVPicture *)pFrameYUV, out_buffer, PIX_FMT_UYVY422, pCodecCtx->width, pCodecCtx->height);
- out_buffer=new uint8_t[avpicture_get_size(PIX_FMT_YUV422P, pCodecCtx->width, pCodecCtx->height)];
- avpicture_fill((AVPicture *)pFrameYUV, out_buffer, PIX_FMT_YUV422P, pCodecCtx->width, pCodecCtx->height);*/
- ......
- FILE *output=fopen("out.rgb","wb+");
- //------------------------------
- while(av_read_frame(pFormatCtx, packet)>=0)
- {
- if(packet->stream_index==videoindex)
- {
- ret = avcodec_decode_video2(pCodecCtx, pFrame, &got_picture, packet);
- if(ret < 0)
- {
- printf("解码错误\n");
- return -1;
- }
- if(got_picture)
- {
- /*img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height, PIX_FMT_UYVY422, SWS_BICUBIC, NULL, NULL, NULL);
- sws_scale(img_convert_ctx, (const uint8_t* const*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameYUV->data, pFrameYUV->linesize);
- img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height, PIX_FMT_YUV422P, SWS_BICUBIC, NULL, NULL, NULL);
- sws_scale(img_convert_ctx, (const uint8_t* const*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameYUV->data, pFrameYUV->linesize);*/
- //转换
- img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height, PIX_FMT_RGB24, SWS_BICUBIC, NULL, NULL, NULL);
- sws_scale(img_convert_ctx, (const uint8_t* const*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameYUV->data, pFrameYUV->linesize);
- //RGB
- fwrite(pFrameYUV->data[0],(pCodecCtx->width)*(pCodecCtx->height)*3,1,output);
- /*
- //UYVY
- fwrite(pFrameYUV->data[0],(pCodecCtx->width)*(pCodecCtx->height),2,output);
- //YUV420P
- fwrite(pFrameYUV->data[0],(pCodecCtx->width)*(pCodecCtx->height),1,output);
- fwrite(pFrameYUV->data[1],(pCodecCtx->width)*(pCodecCtx->height)/4,1,output);
- fwrite(pFrameYUV->data[2],(pCodecCtx->width)*(pCodecCtx->height)/4,1,output);
- */
- ......
- }
- }
- av_free_packet(packet);
- }
- fclose(output);
- ......
- return 0;
- }
从代码中可以看出，解码后的视频帧数据保存在pFrame变量中，然后经过swscale函数转换后，将视频帧数据保存在pFrameYUV变量中。最后将pFrameYUV中的数据写入成文件。
在本代码中，将数据保存成了RGB24的格式。如果想保存成其他格式，比如YUV420，YUV422等，需要做2个步骤：
1.初始化pFrameYUV的时候，设定想要转换的格式：
[cpp] view plain copy
- AVFrame *pFrame,*pFrameYUV;
- pFrame=avcodec_alloc_frame();
- pFrameYUV=avcodec_alloc_frame();
- uint8_t *out_buffer;
- out_buffer=new uint8_t[avpicture_get_size(PIX_FMT_RGB24, pCodecCtx->width, pCodecCtx->height)];
- avpicture_fill((AVPicture *)pFrameYUV, out_buffer, PIX_FMT_RGB24, pCodecCtx->width, pCodecCtx->height);
2.在sws_getContext()中更改想要转换的格式：
[cpp] view plain copy
- img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height, PIX_FMT_RGB24, SWS_BICUBIC, NULL, NULL, NULL);
最后，如果想将转换后的原始数据存成文件，只需要将pFrameYUV的data指针指向的数据写入文件就可以了。
例如，保存YUV420P格式的数据，用以下代码：
[cpp] view plain copy
- fwrite(pFrameYUV->data[0],(pCodecCtx->width)*(pCodecCtx->height),1,output);
- fwrite(pFrameYUV->data[1],(pCodecCtx->width)*(pCodecCtx->height)/4,1,output);
- fwrite(pFrameYUV->data[2],(pCodecCtx->width)*(pCodecCtx->height)/4,1,output);
保存RGB24格式的数据，用以下代码：
[cpp] view plain copy
- fwrite(pFrameYUV->data[0],(pCodecCtx->width)*(pCodecCtx->height)*3,1,output);
保存UYVY格式的数据，用以下代码：
[cpp] view plain copy
- fwrite(pFrameYUV->data[0],(pCodecCtx->width)*(pCodecCtx->height),2,output);
在这里又有一个问题，YUV420P格式需要写入data[0]，data[1]，data[2]；而RGB24，UYVY格式却仅仅是写入data[0]，他们的区别到底是什么呢？经过研究发现，在FFMPEG中，图像原始数据包括两种：planar和packed。planar就是将几个分量分开存，比如YUV420中，data[0]专门存Y，data[1]专门存U，data[2]专门存V。而packed则是打包存，所有数据都存在data[0]中。
具体哪个格式是planar，哪个格式是packed，可以查看pixfmt.h文件。注：有些格式名称后面是LE或BE，分别对应little-endian或big-endian。另外名字后面有P的是planar格式。
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- /* 雷霄骅
- * 中国传媒大学/数字电视技术
- * [email protected]
- *
- */
- /*
- * copyright (c) 2006 Michael Niedermayer
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
- #ifndef AVUTIL_PIXFMT_H
- #define AVUTIL_PIXFMT_H
- /**
- * @file
- * pixel format definitions
- *
- */
- #include "libavutil/avconfig.h"
- /**
- * Pixel format.
- *
- * @note
- * PIX_FMT_RGB32 is handled in an endian-specific manner. An RGBA
- * color is put together as:
- * (A << 24) | (R << 16) | (G << 8) | B
- * This is stored as BGRA on little-endian CPU architectures and ARGB on
- * big-endian CPUs.
- *
- * @par
- * When the pixel format is palettized RGB (PIX_FMT_PAL8), the palettized
- * image data is stored in AVFrame.data[0]. The palette is transported in
- * AVFrame.data[1], is 1024 bytes long (256 4-byte entries) and is
- * formatted the same as in PIX_FMT_RGB32 described above (i.e., it is
- * also endian-specific). Note also that the individual RGB palette
- * components stored in AVFrame.data[1] should be in the range 0..255.
- * This is important as many custom PAL8 video codecs that were designed
- * to run on the IBM VGA graphics adapter use 6-bit palette components.
- *
- * @par
- * For all the 8bit per pixel formats, an RGB32 palette is in data[1] like
- * for pal8. This palette is filled in automatically by the function
- * allocating the picture.
- *
- * @note
- * make sure that all newly added big endian formats have pix_fmt&1==1
- * and that all newly added little endian formats have pix_fmt&1==0
- * this allows simpler detection of big vs little endian.
- */
- enum PixelFormat {
- PIX_FMT_NONE= -1,
- PIX_FMT_YUV420P, ///< planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
- PIX_FMT_YUYV422, ///< packed YUV 4:2:2, 16bpp, Y0 Cb Y1 Cr
- PIX_FMT_RGB24, ///< packed RGB 8:8:8, 24bpp, RGBRGB...
- PIX_FMT_BGR24, ///< packed RGB 8:8:8, 24bpp, BGRBGR...
- PIX_FMT_YUV422P, ///< planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
- PIX_FMT_YUV444P, ///< planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
- PIX_FMT_YUV410P, ///< planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
- PIX_FMT_YUV411P, ///< planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
- PIX_FMT_GRAY8, ///< Y , 8bpp
- PIX_FMT_MONOWHITE, ///< Y , 1bpp, 0 is white, 1 is black, in each byte pixels are ordered from the msb to the lsb
- PIX_FMT_MONOBLACK, ///< Y , 1bpp, 0 is black, 1 is white, in each byte pixels are ordered from the msb to the lsb
- PIX_FMT_PAL8, ///< 8 bit with PIX_FMT_RGB32 palette
- PIX_FMT_YUVJ420P, ///< planar YUV 4:2:0, 12bpp, full scale (JPEG), deprecated in favor of PIX_FMT_YUV420P and setting color_range
- PIX_FMT_YUVJ422P, ///< planar YUV 4:2:2, 16bpp, full scale (JPEG), deprecated in favor of PIX_FMT_YUV422P and setting color_range
- PIX_FMT_YUVJ444P, ///< planar YUV 4:4:4, 24bpp, full scale (JPEG), deprecated in favor of PIX_FMT_YUV444P and setting color_range
- PIX_FMT_XVMC_MPEG2_MC,///< XVideo Motion Acceleration via common packet passing
- PIX_FMT_XVMC_MPEG2_IDCT,
- PIX_FMT_UYVY422, ///< packed YUV 4:2:2, 16bpp, Cb Y0 Cr Y1
- PIX_FMT_UYYVYY411, ///< packed YUV 4:1:1, 12bpp, Cb Y0 Y1 Cr Y2 Y3
- PIX_FMT_BGR8, ///< packed RGB 3:3:2, 8bpp, (msb)2B 3G 3R(lsb)
- PIX_FMT_BGR4, ///< packed RGB 1:2:1 bitstream, 4bpp, (msb)1B 2G 1R(lsb), a byte contains two pixels, the first pixel in the byte is the one composed by the 4 msb bits
- PIX_FMT_BGR4_BYTE, ///< packed RGB 1:2:1, 8bpp, (msb)1B 2G 1R(lsb)
- PIX_FMT_RGB8, ///< packed RGB 3:3:2, 8bpp, (msb)2R 3G 3B(lsb)
- PIX_FMT_RGB4, ///< packed RGB 1:2:1 bitstream, 4bpp, (msb)1R 2G 1B(lsb), a byte contains two pixels, the first pixel in the byte is the one composed by the 4 msb bits
- PIX_FMT_RGB4_BYTE, ///< packed RGB 1:2:1, 8bpp, (msb)1R 2G 1B(lsb)
- PIX_FMT_NV12, ///< planar YUV 4:2:0, 12bpp, 1 plane for Y and 1 plane for the UV components, which are interleaved (first byte U and the following byte V)
- PIX_FMT_NV21, ///< as above, but U and V bytes are swapped
- PIX_FMT_ARGB, ///< packed ARGB 8:8:8:8, 32bpp, ARGBARGB...
- PIX_FMT_RGBA, ///< packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
- PIX_FMT_ABGR, ///< packed ABGR 8:8:8:8, 32bpp, ABGRABGR...
- PIX_FMT_BGRA, ///< packed BGRA 8:8:8:8, 32bpp, BGRABGRA...
- PIX_FMT_GRAY16BE, ///< Y , 16bpp, big-endian
- PIX_FMT_GRAY16LE, ///< Y , 16bpp, little-endian
- PIX_FMT_YUV440P, ///< planar YUV 4:4:0 (1 Cr & Cb sample per 1x2 Y samples)
- PIX_FMT_YUVJ440P, ///< planar YUV 4:4:0 full scale (JPEG), deprecated in favor of PIX_FMT_YUV440P and setting color_range
- PIX_FMT_YUVA420P, ///< planar YUV 4:2:0, 20bpp, (1 Cr & Cb sample per 2x2 Y & A samples)
- PIX_FMT_VDPAU_H264,///< H.264 HW decoding with VDPAU, data[0] contains a vdpau_render_state struct which contains the bitstream of the slices as well as various fields extracted from headers
- PIX_FMT_VDPAU_MPEG1,///< MPEG-1 HW decoding with VDPAU, data[0] contains a vdpau_render_state struct which contains the bitstream of the slices as well as various fields extracted from headers
- PIX_FMT_VDPAU_MPEG2,///< MPEG-2 HW decoding with VDPAU, data[0] contains a vdpau_render_state struct which contains the bitstream of the slices as well as various fields extracted from headers
- PIX_FMT_VDPAU_WMV3,///< WMV3 HW decoding with VDPAU, data[0] contains a vdpau_render_state struct which contains the bitstream of the slices as well as various fields extracted from headers
- PIX_FMT_VDPAU_VC1, ///< VC-1 HW decoding with VDPAU, data[0] contains a vdpau_render_state struct which contains the bitstream of the slices as well as various fields extracted from headers
- PIX_FMT_RGB48BE, ///< packed RGB 16:16:16, 48bpp, 16R, 16G, 16B, the 2-byte value for each R/G/B component is stored as big-endian
- PIX_FMT_RGB48LE, ///< packed RGB 16:16:16, 48bpp, 16R, 16G, 16B, the 2-byte value for each R/G/B component is stored as little-endian
- PIX_FMT_RGB565BE, ///< packed RGB 5:6:5, 16bpp, (msb) 5R 6G 5B(lsb), big-endian
- PIX_FMT_RGB565LE, ///< packed RGB 5:6:5, 16bpp, (msb) 5R 6G 5B(lsb), little-endian
- PIX_FMT_RGB555BE, ///< packed RGB 5:5:5, 16bpp, (msb)1A 5R 5G 5B(lsb), big-endian, most significant bit to 0
- PIX_FMT_RGB555LE, ///< packed RGB 5:5:5, 16bpp, (msb)1A 5R 5G 5B(lsb), little-endian, most significant bit to 0
- PIX_FMT_BGR565BE, ///< packed BGR 5:6:5, 16bpp, (msb) 5B 6G 5R(lsb), big-endian
- PIX_FMT_BGR565LE, ///< packed BGR 5:6:5, 16bpp, (msb) 5B 6G 5R(lsb), little-endian
- PIX_FMT_BGR555BE, ///< packed BGR 5:5:5, 16bpp, (msb)1A 5B 5G 5R(lsb), big-endian, most significant bit to 1
- PIX_FMT_BGR555LE, ///< packed BGR 5:5:5, 16bpp, (msb)1A 5B 5G 5R(lsb), little-endian, most significant bit to 1
- PIX_FMT_VAAPI_MOCO, ///< HW acceleration through VA API at motion compensation entry-point, Picture.data[3] contains a vaapi_render_state struct which contains macroblocks as well as various fields extracted from headers
- PIX_FMT_VAAPI_IDCT, ///< HW acceleration through VA API at IDCT entry-point, Picture.data[3] contains a vaapi_render_state struct which contains fields extracted from headers
- PIX_FMT_VAAPI_VLD, ///< HW decoding through VA API, Picture.data[3] contains a vaapi_render_state struct which contains the bitstream of the slices as well as various fields extracted from headers
- PIX_FMT_YUV420P16LE, ///< planar YUV 4:2:0, 24bpp, (1 Cr & Cb sample per 2x2 Y samples), little-endian
- PIX_FMT_YUV420P16BE, ///< planar YUV 4:2:0, 24bpp, (1 Cr & Cb sample per 2x2 Y samples), big-endian
- PIX_FMT_YUV422P16LE, ///< planar YUV 4:2:2, 32bpp, (1 Cr & Cb sample per 2x1 Y samples), little-endian
- PIX_FMT_YUV422P16BE, ///< planar YUV 4:2:2, 32bpp, (1 Cr & Cb sample per 2x1 Y samples), big-endian
- PIX_FMT_YUV444P16LE, ///< planar YUV 4:4:4, 48bpp, (1 Cr & Cb sample per 1x1 Y samples), little-endian
- PIX_FMT_YUV444P16BE, ///< planar YUV 4:4:4, 48bpp, (1 Cr & Cb sample per 1x1 Y samples), big-endian
- PIX_FMT_VDPAU_MPEG4, ///< MPEG4 HW decoding with VDPAU, data[0] contains a vdpau_render_state struct which contains the bitstream of the slices as well as various fields extracted from headers
- PIX_FMT_DXVA2_VLD, ///< HW decoding through DXVA2, Picture.data[3] contains a LPDIRECT3DSURFACE9 pointer
- PIX_FMT_RGB444LE, ///< packed RGB 4:4:4, 16bpp, (msb)4A 4R 4G 4B(lsb), little-endian, most significant bits to 0
- PIX_FMT_RGB444BE, ///< packed RGB 4:4:4, 16bpp, (msb)4A 4R 4G 4B(lsb), big-endian, most significant bits to 0
- PIX_FMT_BGR444LE, ///< packed BGR 4:4:4, 16bpp, (msb)4A 4B 4G 4R(lsb), little-endian, most significant bits to 1
- PIX_FMT_BGR444BE, ///< packed BGR 4:4:4, 16bpp, (msb)4A 4B 4G 4R(lsb), big-endian, most significant bits to 1
- PIX_FMT_GRAY8A, ///< 8bit gray, 8bit alpha
- PIX_FMT_BGR48BE, ///< packed RGB 16:16:16, 48bpp, 16B, 16G, 16R, the 2-byte value for each R/G/B component is stored as big-endian
- PIX_FMT_BGR48LE, ///< packed RGB 16:16:16, 48bpp, 16B, 16G, 16R, the 2-byte value for each R/G/B component is stored as little-endian
- //the following 10 formats have the disadvantage of needing 1 format for each bit depth, thus
- //If you want to support multiple bit depths, then using PIX_FMT_YUV420P16* with the bpp stored seperately
- //is better
- PIX_FMT_YUV420P9BE, ///< planar YUV 4:2:0, 13.5bpp, (1 Cr & Cb sample per 2x2 Y samples), big-endian
- PIX_FMT_YUV420P9LE, ///< planar YUV 4:2:0, 13.5bpp, (1 Cr & Cb sample per 2x2 Y samples), little-endian
- PIX_FMT_YUV420P10BE,///< planar YUV 4:2:0, 15bpp, (1 Cr & Cb sample per 2x2 Y samples), big-endian
- PIX_FMT_YUV420P10LE,///< planar YUV 4:2:0, 15bpp, (1 Cr & Cb sample per 2x2 Y samples), little-endian
- PIX_FMT_YUV422P10BE,///< planar YUV 4:2:2, 20bpp, (1 Cr & Cb sample per 2x1 Y samples), big-endian
- PIX_FMT_YUV422P10LE,///< planar YUV 4:2:2, 20bpp, (1 Cr & Cb sample per 2x1 Y samples), little-endian
- PIX_FMT_YUV444P9BE, ///< planar YUV 4:4:4, 27bpp, (1 Cr & Cb sample per 1x1 Y samples), big-endian
- PIX_FMT_YUV444P9LE, ///< planar YUV 4:4:4, 27bpp, (1 Cr & Cb sample per 1x1 Y samples), little-endian
- PIX_FMT_YUV444P10BE,///< planar YUV 4:4:4, 30bpp, (1 Cr & Cb sample per 1x1 Y samples), big-endian
- PIX_FMT_YUV444P10LE,///< planar YUV 4:4:4, 30bpp, (1 Cr & Cb sample per 1x1 Y samples), little-endian
- PIX_FMT_YUV422P9BE, ///< planar YUV 4:2:2, 18bpp, (1 Cr & Cb sample per 2x1 Y samples), big-endian
- PIX_FMT_YUV422P9LE, ///< planar YUV 4:2:2, 18bpp, (1 Cr & Cb sample per 2x1 Y samples), little-endian
- PIX_FMT_VDA_VLD, ///< hardware decoding through VDA
- #ifdef AV_PIX_FMT_ABI_GIT_MASTER
- PIX_FMT_RGBA64BE, ///< packed RGBA 16:16:16:16, 64bpp, 16R, 16G, 16B, 16A, the 2-byte value for each R/G/B/A component is stored as big-endian
- PIX_FMT_RGBA64LE, ///< packed RGBA 16:16:16:16, 64bpp, 16R, 16G, 16B, 16A, the 2-byte value for each R/G/B/A component is stored as little-endian
- PIX_FMT_BGRA64BE, ///< packed RGBA 16:16:16:16, 64bpp, 16B, 16G, 16R, 16A, the 2-byte value for each R/G/B/A component is stored as big-endian
- PIX_FMT_BGRA64LE, ///< packed RGBA 16:16:16:16, 64bpp, 16B, 16G, 16R, 16A, the 2-byte value for each R/G/B/A component is stored as little-endian
- #endif
- PIX_FMT_GBRP, ///< planar GBR 4:4:4 24bpp
- PIX_FMT_GBRP9BE, ///< planar GBR 4:4:4 27bpp, big endian
- PIX_FMT_GBRP9LE, ///< planar GBR 4:4:4 27bpp, little endian
- PIX_FMT_GBRP10BE, ///< planar GBR 4:4:4 30bpp, big endian
- PIX_FMT_GBRP10LE, ///< planar GBR 4:4:4 30bpp, little endian
- PIX_FMT_GBRP16BE, ///< planar GBR 4:4:4 48bpp, big endian
- PIX_FMT_GBRP16LE, ///< planar GBR 4:4:4 48bpp, little endian
- #ifndef AV_PIX_FMT_ABI_GIT_MASTER
- PIX_FMT_RGBA64BE=0x123, ///< packed RGBA 16:16:16:16, 64bpp, 16R, 16G, 16B, 16A, the 2-byte value for each R/G/B/A component is stored as big-endian
- PIX_FMT_RGBA64LE, ///< packed RGBA 16:16:16:16, 64bpp, 16R, 16G, 16B, 16A, the 2-byte value for each R/G/B/A component is stored as little-endian
- PIX_FMT_BGRA64BE, ///< packed RGBA 16:16:16:16, 64bpp, 16B, 16G, 16R, 16A, the 2-byte value for each R/G/B/A component is stored as big-endian
- PIX_FMT_BGRA64LE, ///< packed RGBA 16:16:16:16, 64bpp, 16B, 16G, 16R, 16A, the 2-byte value for each R/G/B/A component is stored as little-endian
- #endif
- PIX_FMT_0RGB=0x123+4, ///< packed RGB 8:8:8, 32bpp, 0RGB0RGB...
- PIX_FMT_RGB0, ///< packed RGB 8:8:8, 32bpp, RGB0RGB0...
- PIX_FMT_0BGR, ///< packed BGR 8:8:8, 32bpp, 0BGR0BGR...
- PIX_FMT_BGR0, ///< packed BGR 8:8:8, 32bpp, BGR0BGR0...
- PIX_FMT_YUVA444P, ///< planar YUV 4:4:4 32bpp, (1 Cr & Cb sample per 1x1 Y & A samples)
- PIX_FMT_NB, ///< number of pixel formats, DO NOT USE THIS if you want to link with shared libav* because the number of formats might differ between versions
- };
- #define PIX_FMT_Y400A PIX_FMT_GRAY8A
- #define PIX_FMT_GBR24P PIX_FMT_GBRP
- #if AV_HAVE_BIGENDIAN
- # define PIX_FMT_NE(be, le) PIX_FMT_##be
- #else
- # define PIX_FMT_NE(be, le) PIX_FMT_##le
- #endif
- #define PIX_FMT_RGB32 PIX_FMT_NE(ARGB, BGRA)
- #define PIX_FMT_RGB32_1 PIX_FMT_NE(RGBA, ABGR)
- #define PIX_FMT_BGR32 PIX_FMT_NE(ABGR, RGBA)
- #define PIX_FMT_BGR32_1 PIX_FMT_NE(BGRA, ARGB)
- #define PIX_FMT_0RGB32 PIX_FMT_NE(0RGB, BGR0)
- #define PIX_FMT_0BGR32 PIX_FMT_NE(0BGR, RGB0)
- #define PIX_FMT_GRAY16 PIX_FMT_NE(GRAY16BE, GRAY16LE)
- #define PIX_FMT_RGB48 PIX_FMT_NE(RGB48BE, RGB48LE)
- #define PIX_FMT_RGB565 PIX_FMT_NE(RGB565BE, RGB565LE)
- #define PIX_FMT_RGB555 PIX_FMT_NE(RGB555BE, RGB555LE)
- #define PIX_FMT_RGB444 PIX_FMT_NE(RGB444BE, RGB444LE)
- #define PIX_FMT_BGR48 PIX_FMT_NE(BGR48BE, BGR48LE)
- #define PIX_FMT_BGR565 PIX_FMT_NE(BGR565BE, BGR565LE)
- #define PIX_FMT_BGR555 PIX_FMT_NE(BGR555BE, BGR555LE)
- #define PIX_FMT_BGR444 PIX_FMT_NE(BGR444BE, BGR444LE)
- #define PIX_FMT_YUV420P9 PIX_FMT_NE(YUV420P9BE , YUV420P9LE)
- #define PIX_FMT_YUV422P9 PIX_FMT_NE(YUV422P9BE , YUV422P9LE)
- #define PIX_FMT_YUV444P9 PIX_FMT_NE(YUV444P9BE , YUV444P9LE)
- #define PIX_FMT_YUV420P10 PIX_FMT_NE(YUV420P10BE, YUV420P10LE)
- #define PIX_FMT_YUV422P10 PIX_FMT_NE(YUV422P10BE, YUV422P10LE)
- #define PIX_FMT_YUV444P10 PIX_FMT_NE(YUV444P10BE, YUV444P10LE)
- #define PIX_FMT_YUV420P16 PIX_FMT_NE(YUV420P16BE, YUV420P16LE)
- #define PIX_FMT_YUV422P16 PIX_FMT_NE(YUV422P16BE, YUV422P16LE)
- #define PIX_FMT_YUV444P16 PIX_FMT_NE(YUV444P16BE, YUV444P16LE)
- #define PIX_FMT_RGBA64 PIX_FMT_NE(RGBA64BE, RGBA64LE)
- #define PIX_FMT_BGRA64 PIX_FMT_NE(BGRA64BE, BGRA64LE)
- #define PIX_FMT_GBRP9 PIX_FMT_NE(GBRP9BE , GBRP9LE)
- #define PIX_FMT_GBRP10 PIX_FMT_NE(GBRP10BE, GBRP10LE)
- #define PIX_FMT_GBRP16 PIX_FMT_NE(GBRP16BE, GBRP16LE)
- #endif /* AVUTIL_PIXFMT_H */
转载：http://blog.csdn.net/leixiaohua1020/article/details/12234821