Add support for reading YUV4MPEG2 files to ivfenc.
A large collection of example files may be found at
http://media.xiph.org/video/derf/
This also fixes a bug in ivfenc for uncompressed IVF input, which previously
appeared not to skip past the file header the second time it opened the file.
I don't actually have an IVF file with which to test this fix, however.
Change-Id: Id69a1e11a3fa16c4a4fa8944e880bcea090cd52b
diff --git a/y4minput.c b/y4minput.c
new file mode 100644
index 0000000..f1f50bc
--- /dev/null
+++ b/y4minput.c
@@ -0,0 +1,880 @@
+/*
+ * Copyright (c) 2010 The VP8 project authors. All Rights Reserved.
+ *
+ * Use of this source code is governed by a BSD-style license and patent
+ * grant that can be found in the LICENSE file in the root of the source
+ * tree. All contributing project authors may be found in the AUTHORS
+ * file in the root of the source tree.
+ *
+ * Based on code from the OggTheora software codec source code,
+ * Copyright (C) 2002-2010 The Xiph.Org Foundation and contributors.
+ */
+#include <stdlib.h>
+#include <string.h>
+#include "y4minput.h"
+
+static int y4m_parse_tags(y4m_input *_y4m,char *_tags){
+ int got_w;
+ int got_h;
+ int got_fps;
+ int got_interlace;
+ int got_par;
+ int got_chroma;
+ char *p;
+ char *q;
+ got_w=got_h=got_fps=got_interlace=got_par=got_chroma=0;
+ for(p=_tags;;p=q){
+ /*Skip any leading spaces.*/
+ while(*p==' ')p++;
+ /*If that's all we have, stop.*/
+ if(p[0]=='\0')break;
+ /*Find the end of this tag.*/
+ for(q=p+1;*q!='\0'&&*q!=' ';q++);
+ /*Process the tag.*/
+ switch(p[0]){
+ case 'W':{
+ if(sscanf(p+1,"%d",&_y4m->pic_w)!=1)return -1;
+ got_w=1;
+ }break;
+ case 'H':{
+ if(sscanf(p+1,"%d",&_y4m->pic_h)!=1)return -1;
+ got_h=1;
+ }break;
+ case 'F':{
+ if(sscanf(p+1,"%d:%d",&_y4m->fps_n,&_y4m->fps_d)!=2){
+ return -1;
+ }
+ got_fps=1;
+ }break;
+ case 'I':{
+ _y4m->interlace=p[1];
+ got_interlace=1;
+ }break;
+ case 'A':{
+ if(sscanf(p+1,"%d:%d",&_y4m->par_n,&_y4m->par_d)!=2){
+ return -1;
+ }
+ got_par=1;
+ }break;
+ case 'C':{
+ if(q-p>16)return -1;
+ memcpy(_y4m->chroma_type,p+1,q-p-1);
+ _y4m->chroma_type[q-p-1]='\0';
+ got_chroma=1;
+ }break;
+ /*Ignore unknown tags.*/
+ }
+ }
+ if(!got_w||!got_h||!got_fps)return -1;
+ if(!got_interlace)_y4m->interlace='?';
+ if(!got_par)_y4m->par_n=_y4m->par_d=0;
+ /*Chroma-type is not specified in older files, e.g., those generated by
+ mplayer.*/
+ if(!got_chroma)strcpy(_y4m->chroma_type,"420");
+ return 0;
+}
+
+
+
+/*All anti-aliasing filters in the following conversion functions are based on
+ one of two window functions:
+ The 6-tap Lanczos window (for down-sampling and shifts):
+ sinc(\pi*t)*sinc(\pi*t/3), |t|<3 (sinc(t)==sin(t)/t)
+ 0, |t|>=3
+ The 4-tap Mitchell window (for up-sampling):
+ 7|t|^3-12|t|^2+16/3, |t|<1
+ -(7/3)|x|^3+12|x|^2-20|x|+32/3, |t|<2
+ 0, |t|>=2
+ The number of taps is intentionally kept small to reduce computational
+ overhead and limit ringing.
+
+ The taps from these filters are scaled so that their sum is 1, and the result
+ is scaled by 128 and rounded to integers to create a filter whose
+ intermediate values fit inside 16 bits.
+ Coefficients are rounded in such a way as to ensure their sum is still 128,
+ which is usually equivalent to normal rounding.
+
+ Conversions which require both horizontal and vertical filtering could
+ have these steps pipelined, for less memory consumption and better cache
+ performance, but we do them separately for simplicity.*/
+
+#define OC_MINI(_a,_b) ((_a)>(_b)?(_b):(_a))
+#define OC_MAXI(_a,_b) ((_a)<(_b)?(_b):(_a))
+#define OC_CLAMPI(_a,_b,_c) (OC_MAXI(_a,OC_MINI(_b,_c)))
+
+/*420jpeg chroma samples are sited like:
+ Y-------Y-------Y-------Y-------
+ | | | |
+ | BR | | BR |
+ | | | |
+ Y-------Y-------Y-------Y-------
+ | | | |
+ | | | |
+ | | | |
+ Y-------Y-------Y-------Y-------
+ | | | |
+ | BR | | BR |
+ | | | |
+ Y-------Y-------Y-------Y-------
+ | | | |
+ | | | |
+ | | | |
+
+ 420mpeg2 chroma samples are sited like:
+ Y-------Y-------Y-------Y-------
+ | | | |
+ BR | BR |
+ | | | |
+ Y-------Y-------Y-------Y-------
+ | | | |
+ | | | |
+ | | | |
+ Y-------Y-------Y-------Y-------
+ | | | |
+ BR | BR |
+ | | | |
+ Y-------Y-------Y-------Y-------
+ | | | |
+ | | | |
+ | | | |
+
+ We use a resampling filter to shift the site locations one quarter pixel (at
+ the chroma plane's resolution) to the right.
+ The 4:2:2 modes look exactly the same, except there are twice as many chroma
+ lines, and they are vertically co-sited with the luma samples in both the
+ mpeg2 and jpeg cases (thus requiring no vertical resampling).*/
+static void y4m_42xmpeg2_42xjpeg_helper(unsigned char *_dst,
+ const unsigned char *_src,int _c_w,int _c_h){
+ int pli;
+ int y;
+ int x;
+ for(y=0;y<_c_h;y++){
+ /*Filter: [4 -17 114 35 -9 1]/128, derived from a 6-tap Lanczos
+ window.*/
+ for(x=0;x<OC_MINI(_c_w,2);x++){
+ _dst[x]=(unsigned char)OC_CLAMPI(0,(4*_src[0]-17*_src[OC_MAXI(x-1,0)]+
+ 114*_src[x]+35*_src[OC_MINI(x+1,_c_w-1)]-9*_src[OC_MINI(x+2,_c_w-1)]+
+ _src[OC_MINI(x+3,_c_w-1)]+64)>>7,255);
+ }
+ for(;x<_c_w-3;x++){
+ _dst[x]=(unsigned char)OC_CLAMPI(0,(4*_src[x-2]-17*_src[x-1]+
+ 114*_src[x]+35*_src[x+1]-9*_src[x+2]+_src[x+3]+64)>>7,255);
+ }
+ for(;x<_c_w;x++){
+ _dst[x]=(unsigned char)OC_CLAMPI(0,(4*_src[x-2]-17*_src[x-1]+
+ 114*_src[x]+35*_src[OC_MINI(x+1,_c_w-1)]-9*_src[OC_MINI(x+2,_c_w-1)]+
+ _src[_c_w-1]+64)>>7,255);
+ }
+ _dst+=_c_w;
+ _src+=_c_w;
+ }
+}
+
+/*Handles both 422 and 420mpeg2 to 422jpeg and 420jpeg, respectively.*/
+static void y4m_convert_42xmpeg2_42xjpeg(y4m_input *_y4m,unsigned char *_dst,
+ unsigned char *_aux){
+ int c_w;
+ int c_h;
+ int c_sz;
+ int pli;
+ int y;
+ int x;
+ /*Skip past the luma data.*/
+ _dst+=_y4m->pic_w*_y4m->pic_h;
+ /*Compute the size of each chroma plane.*/
+ c_w=(_y4m->pic_w+_y4m->dst_c_dec_h-1)/_y4m->dst_c_dec_h;
+ c_h=(_y4m->pic_h+_y4m->dst_c_dec_v-1)/_y4m->dst_c_dec_v;
+ c_sz=c_w*c_h;
+ for(pli=1;pli<3;pli++){
+ y4m_42xmpeg2_42xjpeg_helper(_dst,_aux,c_w,c_h);
+ _dst+=c_sz;
+ _aux+=c_sz;
+ }
+}
+
+/*This format is only used for interlaced content, but is included for
+ completeness.
+
+ 420jpeg chroma samples are sited like:
+ Y-------Y-------Y-------Y-------
+ | | | |
+ | BR | | BR |
+ | | | |
+ Y-------Y-------Y-------Y-------
+ | | | |
+ | | | |
+ | | | |
+ Y-------Y-------Y-------Y-------
+ | | | |
+ | BR | | BR |
+ | | | |
+ Y-------Y-------Y-------Y-------
+ | | | |
+ | | | |
+ | | | |
+
+ 420paldv chroma samples are sited like:
+ YR------Y-------YR------Y-------
+ | | | |
+ | | | |
+ | | | |
+ YB------Y-------YB------Y-------
+ | | | |
+ | | | |
+ | | | |
+ YR------Y-------YR------Y-------
+ | | | |
+ | | | |
+ | | | |
+ YB------Y-------YB------Y-------
+ | | | |
+ | | | |
+ | | | |
+
+ We use a resampling filter to shift the site locations one quarter pixel (at
+ the chroma plane's resolution) to the right.
+ Then we use another filter to move the C_r location down one quarter pixel,
+ and the C_b location up one quarter pixel.*/
+static void y4m_convert_42xpaldv_42xjpeg(y4m_input *_y4m,unsigned char *_dst,
+ unsigned char *_aux){
+ unsigned char *tmp;
+ int c_w;
+ int c_h;
+ int c_sz;
+ int pli;
+ int y;
+ int x;
+ /*Skip past the luma data.*/
+ _dst+=_y4m->pic_w*_y4m->pic_h;
+ /*Compute the size of each chroma plane.*/
+ c_w=(_y4m->pic_w+1)/2;
+ c_h=(_y4m->pic_h+_y4m->dst_c_dec_h-1)/_y4m->dst_c_dec_h;
+ c_sz=c_w*c_h;
+ tmp=_aux+2*c_sz;
+ for(pli=1;pli<3;pli++){
+ /*First do the horizontal re-sampling.
+ This is the same as the mpeg2 case, except that after the horizontal
+ case, we need to apply a second vertical filter.*/
+ y4m_42xmpeg2_42xjpeg_helper(tmp,_aux,c_w,c_h);
+ _aux+=c_sz;
+ switch(pli){
+ case 1:{
+ /*Slide C_b up a quarter-pel.
+ This is the same filter used above, but in the other order.*/
+ for(x=0;x<c_w;x++){
+ for(y=0;y<OC_MINI(c_h,3);y++){
+ _dst[y*c_w]=(unsigned char)OC_CLAMPI(0,(tmp[0]
+ -9*tmp[OC_MAXI(y-2,0)*c_w]+35*tmp[OC_MAXI(y-1,0)*c_w]
+ +114*tmp[y*c_w]-17*tmp[OC_MINI(y+1,c_h-1)*c_w]
+ +4*tmp[OC_MINI(y+2,c_h-1)*c_w]+64)>>7,255);
+ }
+ for(;y<c_h-2;y++){
+ _dst[y*c_w]=(unsigned char)OC_CLAMPI(0,(tmp[(y-3)*c_w]
+ -9*tmp[(y-2)*c_w]+35*tmp[(y-1)*c_w]+114*tmp[y*c_w]
+ -17*tmp[(y+1)*c_w]+4*tmp[(y+2)*c_w]+64)>>7,255);
+ }
+ for(;y<c_h;y++){
+ _dst[y*c_w]=(unsigned char)OC_CLAMPI(0,(tmp[(y-3)*c_w]
+ -9*tmp[(y-2)*c_w]+35*tmp[(y-1)*c_w]+114*tmp[y*c_w]
+ -17*tmp[OC_MINI(y+1,c_h-1)*c_w]+4*tmp[(c_h-1)*c_w]+64)>>7,255);
+ }
+ _dst++;
+ tmp++;
+ }
+ _dst+=c_sz-c_w;
+ tmp-=c_w;
+ }break;
+ case 2:{
+ /*Slide C_r down a quarter-pel.
+ This is the same as the horizontal filter.*/
+ for(x=0;x<c_w;x++){
+ for(y=0;y<OC_MINI(c_h,2);y++){
+ _dst[y*c_w]=(unsigned char)OC_CLAMPI(0,(4*tmp[0]
+ -17*tmp[OC_MAXI(y-1,0)*c_w]+114*tmp[y*c_w]
+ +35*tmp[OC_MINI(y+1,c_h-1)*c_w]-9*tmp[OC_MINI(y+2,c_h-1)*c_w]
+ +tmp[OC_MINI(y+3,c_h-1)*c_w]+64)>>7,255);
+ }
+ for(;y<c_h-3;y++){
+ _dst[y*c_w]=(unsigned char)OC_CLAMPI(0,(4*tmp[(y-2)*c_w]
+ -17*tmp[(y-1)*c_w]+114*tmp[y*c_w]+35*tmp[(y+1)*c_w]
+ -9*tmp[(y+2)*c_w]+tmp[(y+3)*c_w]+64)>>7,255);
+ }
+ for(;y<c_h;y++){
+ _dst[y*c_w]=(unsigned char)OC_CLAMPI(0,(4*tmp[(y-2)*c_w]
+ -17*tmp[(y-1)*c_w]+114*tmp[y*c_w]+35*tmp[OC_MINI(y+1,c_h-1)*c_w]
+ -9*tmp[OC_MINI(y+2,c_h-1)*c_w]+tmp[(c_h-1)*c_w]+64)>>7,255);
+ }
+ _dst++;
+ tmp++;
+ }
+ }break;
+ }
+ /*For actual interlaced material, this would have to be done separately on
+ each field, and the shift amounts would be different.
+ C_r moves down 1/8, C_b up 3/8 in the top field, and C_r moves down 3/8,
+ C_b up 1/8 in the bottom field.
+ The corresponding filters would be:
+ Down 1/8 (reverse order for up): [3 -11 125 15 -4 0]/128
+ Down 3/8 (reverse order for up): [4 -19 98 56 -13 2]/128*/
+ }
+}
+
+/*Perform vertical filtering to reduce a single plane from 4:2:2 to 4:2:0.
+ This is used as a helper by several converation routines.*/
+static void y4m_422jpeg_420jpeg_helper(unsigned char *_dst,
+ const unsigned char *_src,int _c_w,int _c_h){
+ int y;
+ int x;
+ /*Filter: [3 -17 78 78 -17 3]/128, derived from a 6-tap Lanczos window.*/
+ for(x=0;x<_c_w;x++){
+ for(y=0;y<OC_MINI(_c_h,2);y+=2){
+ _dst[(y>>1)*_c_w]=OC_CLAMPI(0,(64*_src[0]
+ +78*_src[OC_MINI(1,_c_h-1)*_c_w]
+ -17*_src[OC_MINI(2,_c_h-1)*_c_w]
+ +3*_src[OC_MINI(3,_c_h-1)*_c_w]+64)>>7,255);
+ }
+ for(;y<_c_h-3;y+=2){
+ _dst[(y>>1)*_c_w]=OC_CLAMPI(0,(3*(_src[(y-2)*_c_w]+_src[(y+3)*_c_w])
+ -17*(_src[(y-1)*_c_w]+_src[(y+2)*_c_w])
+ +78*(_src[y*_c_w]+_src[(y+1)*_c_w])+64)>>7,255);
+ }
+ for(;y<_c_h;y+=2){
+ _dst[(y>>1)*_c_w]=OC_CLAMPI(0,(3*(_src[(y-2)*_c_w]
+ +_src[(_c_h-1)*_c_w])-17*(_src[(y-1)*_c_w]
+ +_src[OC_MINI(y+2,_c_h-1)*_c_w])
+ +78*(_src[y*_c_w]+_src[OC_MINI(y+1,_c_h-1)*_c_w])+64)>>7,255);
+ }
+ _src++;
+ _dst++;
+ }
+}
+
+/*420jpeg chroma samples are sited like:
+ Y-------Y-------Y-------Y-------
+ | | | |
+ | BR | | BR |
+ | | | |
+ Y-------Y-------Y-------Y-------
+ | | | |
+ | | | |
+ | | | |
+ Y-------Y-------Y-------Y-------
+ | | | |
+ | BR | | BR |
+ | | | |
+ Y-------Y-------Y-------Y-------
+ | | | |
+ | | | |
+ | | | |
+
+ 422jpeg chroma samples are sited like:
+ Y---BR--Y-------Y---BR--Y-------
+ | | | |
+ | | | |
+ | | | |
+ Y---BR--Y-------Y---BR--Y-------
+ | | | |
+ | | | |
+ | | | |
+ Y---BR--Y-------Y---BR--Y-------
+ | | | |
+ | | | |
+ | | | |
+ Y---BR--Y-------Y---BR--Y-------
+ | | | |
+ | | | |
+ | | | |
+
+ We use a resampling filter to decimate the chroma planes by two in the
+ vertical direction.*/
+static void y4m_convert_422jpeg_420jpeg(y4m_input *_y4m,unsigned char *_dst,
+ unsigned char *_aux){
+ int c_w;
+ int c_h;
+ int c_sz;
+ int dst_c_w;
+ int dst_c_h;
+ int dst_c_sz;
+ int tmp_sz;
+ int pic_sz;
+ int pli;
+ /*Skip past the luma data.*/
+ _dst+=_y4m->pic_w*_y4m->pic_h;
+ /*Compute the size of each chroma plane.*/
+ c_w=(_y4m->pic_w+_y4m->src_c_dec_h-1)/_y4m->src_c_dec_h;
+ c_h=_y4m->pic_h;
+ dst_c_w=(_y4m->pic_w+_y4m->dst_c_dec_h-1)/_y4m->dst_c_dec_h;
+ dst_c_h=(_y4m->pic_h+_y4m->dst_c_dec_v-1)/_y4m->dst_c_dec_v;
+ c_sz=c_w*c_h;
+ dst_c_sz=dst_c_w*dst_c_h;
+ for(pli=1;pli<3;pli++){
+ y4m_422jpeg_420jpeg_helper(_dst,_aux,c_w,c_h);
+ _aux+=c_sz;
+ _dst+=dst_c_sz;
+ }
+}
+
+/*420jpeg chroma samples are sited like:
+ Y-------Y-------Y-------Y-------
+ | | | |
+ | BR | | BR |
+ | | | |
+ Y-------Y-------Y-------Y-------
+ | | | |
+ | | | |
+ | | | |
+ Y-------Y-------Y-------Y-------
+ | | | |
+ | BR | | BR |
+ | | | |
+ Y-------Y-------Y-------Y-------
+ | | | |
+ | | | |
+ | | | |
+
+ 422 chroma samples are sited like:
+ YBR-----Y-------YBR-----Y-------
+ | | | |
+ | | | |
+ | | | |
+ YBR-----Y-------YBR-----Y-------
+ | | | |
+ | | | |
+ | | | |
+ YBR-----Y-------YBR-----Y-------
+ | | | |
+ | | | |
+ | | | |
+ YBR-----Y-------YBR-----Y-------
+ | | | |
+ | | | |
+ | | | |
+
+ We use a resampling filter to shift the original site locations one quarter
+ pixel (at the original chroma resolution) to the right.
+ Then we use a second resampling filter to decimate the chroma planes by two
+ in the vertical direction.*/
+static void y4m_convert_422_420jpeg(y4m_input *_y4m,unsigned char *_dst,
+ unsigned char *_aux){
+ unsigned char *tmp;
+ int c_w;
+ int c_h;
+ int c_sz;
+ int dst_c_w;
+ int dst_c_h;
+ int dst_c_sz;
+ int pli;
+ int y;
+ int x;
+ /*Skip past the luma data.*/
+ _dst+=_y4m->pic_w*_y4m->pic_h;
+ /*Compute the size of each chroma plane.*/
+ c_w=(_y4m->pic_w+_y4m->src_c_dec_h-1)/_y4m->src_c_dec_h;
+ c_h=_y4m->pic_h;
+ dst_c_h=(_y4m->pic_h+_y4m->dst_c_dec_v-1)/_y4m->dst_c_dec_v;
+ c_sz=c_w*c_h;
+ dst_c_sz=c_w*dst_c_h;
+ tmp=_aux+2*c_sz;
+ for(pli=1;pli<3;pli++){
+ /*In reality, the horizontal and vertical steps could be pipelined, for
+ less memory consumption and better cache performance, but we do them
+ separately for simplicity.*/
+ /*First do horizontal filtering (convert to 422jpeg)*/
+ y4m_42xmpeg2_42xjpeg_helper(tmp,_aux,c_w,c_h);
+ /*Now do the vertical filtering.*/
+ y4m_422jpeg_420jpeg_helper(_dst,tmp,c_w,c_h);
+ _aux+=c_sz;
+ _dst+=dst_c_sz;
+ }
+}
+
+/*420jpeg chroma samples are sited like:
+ Y-------Y-------Y-------Y-------
+ | | | |
+ | BR | | BR |
+ | | | |
+ Y-------Y-------Y-------Y-------
+ | | | |
+ | | | |
+ | | | |
+ Y-------Y-------Y-------Y-------
+ | | | |
+ | BR | | BR |
+ | | | |
+ Y-------Y-------Y-------Y-------
+ | | | |
+ | | | |
+ | | | |
+
+ 411 chroma samples are sited like:
+ YBR-----Y-------Y-------Y-------
+ | | | |
+ | | | |
+ | | | |
+ YBR-----Y-------Y-------Y-------
+ | | | |
+ | | | |
+ | | | |
+ YBR-----Y-------Y-------Y-------
+ | | | |
+ | | | |
+ | | | |
+ YBR-----Y-------Y-------Y-------
+ | | | |
+ | | | |
+ | | | |
+
+ We use a filter to resample at site locations one eighth pixel (at the source
+ chroma plane's horizontal resolution) and five eighths of a pixel to the
+ right.
+ Then we use another filter to decimate the planes by 2 in the vertical
+ direction.*/
+static void y4m_convert_411_420jpeg(y4m_input *_y4m,unsigned char *_dst,
+ unsigned char *_aux){
+ unsigned char *tmp;
+ int c_w;
+ int c_h;
+ int c_sz;
+ int dst_c_w;
+ int dst_c_h;
+ int dst_c_sz;
+ int tmp_sz;
+ int pli;
+ int y;
+ int x;
+ /*Skip past the luma data.*/
+ _dst+=_y4m->pic_w*_y4m->pic_h;
+ /*Compute the size of each chroma plane.*/
+ c_w=(_y4m->pic_w+_y4m->src_c_dec_h-1)/_y4m->src_c_dec_h;
+ c_h=_y4m->pic_h;
+ dst_c_w=(_y4m->pic_w+_y4m->dst_c_dec_h-1)/_y4m->dst_c_dec_h;
+ dst_c_h=(_y4m->pic_h+_y4m->dst_c_dec_v-1)/_y4m->dst_c_dec_v;
+ c_sz=c_w*c_h;
+ dst_c_sz=dst_c_w*dst_c_h;
+ tmp_sz=dst_c_w*c_h;
+ tmp=_aux+2*c_sz;
+ for(pli=1;pli<3;pli++){
+ /*In reality, the horizontal and vertical steps could be pipelined, for
+ less memory consumption and better cache performance, but we do them
+ separately for simplicity.*/
+ /*First do horizontal filtering (convert to 422jpeg)*/
+ for(y=0;y<c_h;y++){
+ /*Filters: [1 110 18 -1]/128 and [-3 50 86 -5]/128, both derived from a
+ 4-tap Mitchell window.*/
+ for(x=0;x<OC_MINI(c_w,1);x++){
+ tmp[x<<1]=(unsigned char)OC_CLAMPI(0,(111*_aux[0]
+ +18*_aux[OC_MINI(1,c_w-1)]-_aux[OC_MINI(2,c_w-1)]+64)>>7,255);
+ tmp[x<<1|1]=(unsigned char)OC_CLAMPI(0,(47*_aux[0]
+ +86*_aux[OC_MINI(1,c_w-1)]-5*_aux[OC_MINI(2,c_w-1)]+64)>>7,255);
+ }
+ for(;x<c_w-2;x++){
+ tmp[x<<1]=(unsigned char)OC_CLAMPI(0,(_aux[x-1]+110*_aux[x]
+ +18*_aux[x+1]-_aux[x+2]+64)>>7,255);
+ tmp[x<<1|1]=(unsigned char)OC_CLAMPI(0,(-3*_aux[x-1]+50*_aux[x]
+ +86*_aux[x+1]-5*_aux[x+2]+64)>>7,255);
+ }
+ for(;x<c_w;x++){
+ tmp[x<<1]=(unsigned char)OC_CLAMPI(0,(_aux[x-1]+110*_aux[x]
+ +18*_aux[OC_MINI(x+1,c_w-1)]-_aux[c_w-1]+64)>>7,255);
+ if((x<<1|1)<dst_c_w){
+ tmp[x<<1|1]=(unsigned char)OC_CLAMPI(0,(-3*_aux[x-1]+50*_aux[x]
+ +86*_aux[OC_MINI(x+1,c_w-1)]-5*_aux[c_w-1]+64)>>7,255);
+ }
+ }
+ tmp+=dst_c_w;
+ _aux+=c_w;
+ }
+ tmp-=tmp_sz;
+ /*Now do the vertical filtering.*/
+ y4m_422jpeg_420jpeg_helper(_dst,tmp,dst_c_w,c_h);
+ _dst+=dst_c_sz;
+ }
+}
+
+/*Convert 444 to 420jpeg.*/
+static void y4m_convert_444_420jpeg(y4m_input *_y4m,unsigned char *_dst,
+ unsigned char *_aux){
+ unsigned char *tmp;
+ int c_w;
+ int c_h;
+ int c_sz;
+ int dst_c_w;
+ int dst_c_h;
+ int dst_c_sz;
+ int tmp_sz;
+ int pli;
+ int y;
+ int x;
+ /*Skip past the luma data.*/
+ _dst+=_y4m->pic_w*_y4m->pic_h;
+ /*Compute the size of each chroma plane.*/
+ c_w=(_y4m->pic_w+_y4m->src_c_dec_h-1)/_y4m->src_c_dec_h;
+ c_h=_y4m->pic_h;
+ dst_c_w=(_y4m->pic_w+_y4m->dst_c_dec_h-1)/_y4m->dst_c_dec_h;
+ dst_c_h=(_y4m->pic_h+_y4m->dst_c_dec_v-1)/_y4m->dst_c_dec_v;
+ c_sz=c_w*c_h;
+ dst_c_sz=dst_c_w*dst_c_h;
+ tmp_sz=dst_c_w*c_h;
+ tmp=_aux+2*c_sz;
+ for(pli=1;pli<3;pli++){
+ /*Filter: [3 -17 78 78 -17 3]/128, derived from a 6-tap Lanczos window.*/
+ for(y=0;y<c_h;y++){
+ for(x=0;x<OC_MINI(c_w,2);x+=2){
+ tmp[x>>1]=OC_CLAMPI(0,(64*_aux[0]+78*_aux[OC_MINI(1,c_w-1)]
+ -17*_aux[OC_MINI(2,c_w-1)]
+ +3*_aux[OC_MINI(3,c_w-1)]+64)>>7,255);
+ }
+ for(;x<c_w-3;x+=2){
+ tmp[x>>1]=OC_CLAMPI(0,(3*(_aux[x-2]+_aux[x+3])
+ -17*(_aux[x-1]+_aux[x+2])+78*(_aux[x]+_aux[x+1])+64)>>7,255);
+ }
+ for(;x<c_w;x+=2){
+ tmp[x>>1]=OC_CLAMPI(0,(3*(_aux[x-2]+_aux[c_w-1])-
+ 17*(_aux[x-1]+_aux[OC_MINI(x+2,c_w-1)])+
+ 78*(_aux[x]+_aux[OC_MINI(x+1,c_w-1)])+64)>>7,255);
+ }
+ tmp+=dst_c_w;
+ _aux+=c_w;
+ }
+ tmp-=tmp_sz;
+ /*Now do the vertical filtering.*/
+ y4m_422jpeg_420jpeg_helper(_dst,tmp,dst_c_w,c_h);
+ _dst+=dst_c_sz;
+ }
+}
+
+/*The image is padded with empty chroma components at 4:2:0.*/
+static void y4m_convert_mono_420jpeg(y4m_input *_y4m,unsigned char *_dst,
+ unsigned char *_aux){
+ int c_sz;
+ _dst+=_y4m->pic_w*_y4m->pic_h;
+ c_sz=((_y4m->pic_w+_y4m->dst_c_dec_h-1)/_y4m->dst_c_dec_h)*
+ ((_y4m->pic_h+_y4m->dst_c_dec_v-1)/_y4m->dst_c_dec_v);
+ memset(_dst,128,c_sz*2);
+}
+
+/*No conversion function needed.*/
+static void y4m_convert_null(y4m_input *_y4m,unsigned char *_dst,
+ unsigned char *_aux){
+}
+
+int y4m_input_open(y4m_input *_y4m,FILE *_fin,char *_skip,int _nskip){
+ char buffer[80];
+ int ret;
+ int i;
+ /*Read until newline, or 80 cols, whichever happens first.*/
+ for(i=0;i<79;i++){
+ if(_nskip>0){
+ buffer[i]=*_skip++;
+ _nskip--;
+ }
+ else{
+ ret=fread(buffer+i,1,1,_fin);
+ if(ret<1)return -1;
+ }
+ if(buffer[i]=='\n')break;
+ }
+ /*We skipped too much header data.*/
+ if(_nskip>0)return -1;
+ if(i==79){
+ fprintf(stderr,"Error parsing header; not a YUV2MPEG2 file?\n");
+ return -1;
+ }
+ buffer[i]='\0';
+ if(memcmp(buffer,"YUV4MPEG",8)){
+ fprintf(stderr,"Incomplete magic for YUV4MPEG file.\n");
+ return -1;
+ }
+ if(buffer[8]!='2'){
+ fprintf(stderr,"Incorrect YUV input file version; YUV4MPEG2 required.\n");
+ }
+ ret=y4m_parse_tags(_y4m,buffer+5);
+ if(ret<0){
+ fprintf(stderr,"Error parsing YUV4MPEG2 header.\n");
+ return ret;
+ }
+ if(_y4m->interlace=='?'){
+ fprintf(stderr,"Warning: Input video interlacing format unknown; "
+ "assuming progressive scan.\n");
+ }
+ else if(_y4m->interlace!='p'){
+ fprintf(stderr,"Input video is interlaced; "
+ "Only progressive scan handled.\n");
+ return -1;
+ }
+ if(strcmp(_y4m->chroma_type,"420")==0||
+ strcmp(_y4m->chroma_type,"420jpeg")==0){
+ _y4m->src_c_dec_h=_y4m->dst_c_dec_h=_y4m->src_c_dec_v=_y4m->dst_c_dec_v=2;
+ _y4m->dst_buf_read_sz=_y4m->pic_w*_y4m->pic_h
+ +2*((_y4m->pic_w+1)/2)*((_y4m->pic_h+1)/2);
+ /*Natively supported: no conversion required.*/
+ _y4m->aux_buf_sz=_y4m->aux_buf_read_sz=0;
+ _y4m->convert=y4m_convert_null;
+ }
+ else if(strcmp(_y4m->chroma_type,"420mpeg2")==0){
+ _y4m->src_c_dec_h=_y4m->dst_c_dec_h=_y4m->src_c_dec_v=_y4m->dst_c_dec_v=2;
+ _y4m->dst_buf_read_sz=_y4m->pic_w*_y4m->pic_h;
+ /*Chroma filter required: read into the aux buf first.*/
+ _y4m->aux_buf_sz=_y4m->aux_buf_read_sz=
+ 2*((_y4m->pic_w+1)/2)*((_y4m->pic_h+1)/2);
+ _y4m->convert=y4m_convert_42xmpeg2_42xjpeg;
+ }
+ else if(strcmp(_y4m->chroma_type,"420paldv")==0){
+ _y4m->src_c_dec_h=_y4m->dst_c_dec_h=_y4m->src_c_dec_v=_y4m->dst_c_dec_v=2;
+ _y4m->dst_buf_read_sz=_y4m->pic_w*_y4m->pic_h;
+ /*Chroma filter required: read into the aux buf first.
+ We need to make two filter passes, so we need some extra space in the
+ aux buffer.*/
+ _y4m->aux_buf_sz=3*((_y4m->pic_w+1)/2)*((_y4m->pic_h+1)/2);
+ _y4m->aux_buf_read_sz=2*((_y4m->pic_w+1)/2)*((_y4m->pic_h+1)/2);
+ _y4m->convert=y4m_convert_42xpaldv_42xjpeg;
+ }
+ else if(strcmp(_y4m->chroma_type,"422jpeg")==0){
+ _y4m->src_c_dec_h=_y4m->dst_c_dec_h=2;
+ _y4m->src_c_dec_v=1;
+ _y4m->dst_c_dec_v=2;
+ _y4m->dst_buf_read_sz=_y4m->pic_w*_y4m->pic_h;
+ /*Chroma filter required: read into the aux buf first.*/
+ _y4m->aux_buf_sz=_y4m->aux_buf_read_sz=2*((_y4m->pic_w+1)/2)*_y4m->pic_h;
+ _y4m->convert=y4m_convert_422jpeg_420jpeg;
+ }
+ else if(strcmp(_y4m->chroma_type,"422")==0){
+ _y4m->src_c_dec_h=_y4m->dst_c_dec_h=2;
+ _y4m->src_c_dec_v=1;
+ _y4m->dst_c_dec_v=2;
+ _y4m->dst_buf_read_sz=_y4m->pic_w*_y4m->pic_h;
+ /*Chroma filter required: read into the aux buf first.
+ We need to make two filter passes, so we need some extra space in the
+ aux buffer.*/
+ _y4m->aux_buf_read_sz=2*((_y4m->pic_w+1)/2)*_y4m->pic_h;
+ _y4m->aux_buf_sz=_y4m->aux_buf_read_sz+((_y4m->pic_w+1)/2)*_y4m->pic_h;
+ _y4m->convert=y4m_convert_422_420jpeg;
+ }
+ else if(strcmp(_y4m->chroma_type,"411")==0){
+ _y4m->src_c_dec_h=4;
+ _y4m->dst_c_dec_h=2;
+ _y4m->src_c_dec_v=1;
+ _y4m->dst_c_dec_v=2;
+ _y4m->dst_buf_read_sz=_y4m->pic_w*_y4m->pic_h;
+ /*Chroma filter required: read into the aux buf first.
+ We need to make two filter passes, so we need some extra space in the
+ aux buffer.*/
+ _y4m->aux_buf_read_sz=2*((_y4m->pic_w+3)/4)*_y4m->pic_h;
+ _y4m->aux_buf_sz=_y4m->aux_buf_read_sz+((_y4m->pic_w+1)/2)*_y4m->pic_h;
+ _y4m->convert=y4m_convert_411_420jpeg;
+ }
+ else if(strcmp(_y4m->chroma_type,"444")==0){
+ _y4m->src_c_dec_h=1;
+ _y4m->dst_c_dec_h=2;
+ _y4m->src_c_dec_v=1;
+ _y4m->dst_c_dec_v=2;
+ _y4m->dst_buf_read_sz=_y4m->pic_w*_y4m->pic_h;
+ /*Chroma filter required: read into the aux buf first.
+ We need to make two filter passes, so we need some extra space in the
+ aux buffer.*/
+ _y4m->aux_buf_read_sz=2*_y4m->pic_w*_y4m->pic_h;
+ _y4m->aux_buf_sz=_y4m->aux_buf_read_sz+((_y4m->pic_w+1)/2)*_y4m->pic_h;
+ _y4m->convert=y4m_convert_444_420jpeg;
+ }
+ else if(strcmp(_y4m->chroma_type,"444alpha")==0){
+ _y4m->src_c_dec_h=1;
+ _y4m->dst_c_dec_h=2;
+ _y4m->src_c_dec_v=1;
+ _y4m->dst_c_dec_v=2;
+ _y4m->dst_buf_read_sz=_y4m->pic_w*_y4m->pic_h;
+ /*Chroma filter required: read into the aux buf first.
+ We need to make two filter passes, so we need some extra space in the
+ aux buffer.
+ The extra plane also gets read into the aux buf.
+ It will be discarded.*/
+ _y4m->aux_buf_sz=_y4m->aux_buf_read_sz=3*_y4m->pic_w*_y4m->pic_h;
+ _y4m->convert=y4m_convert_444_420jpeg;
+ }
+ else if(strcmp(_y4m->chroma_type,"mono")==0){
+ _y4m->src_c_dec_h=_y4m->src_c_dec_v=0;
+ _y4m->dst_c_dec_h=_y4m->dst_c_dec_v=2;
+ _y4m->dst_buf_read_sz=_y4m->pic_w*_y4m->pic_h;
+ /*No extra space required, but we need to clear the chroma planes.*/
+ _y4m->aux_buf_sz=_y4m->aux_buf_read_sz=0;
+ _y4m->convert=y4m_convert_mono_420jpeg;
+ }
+ else{
+ fprintf(stderr,"Unknown chroma sampling type: %s\n",_y4m->chroma_type);
+ return -1;
+ }
+ /*The size of the final frame buffers is always computed from the
+ destination chroma decimation type.*/
+ _y4m->dst_buf_sz=_y4m->pic_w*_y4m->pic_h
+ +2*((_y4m->pic_w+_y4m->dst_c_dec_h-1)/_y4m->dst_c_dec_h)*
+ ((_y4m->pic_h+_y4m->dst_c_dec_v-1)/_y4m->dst_c_dec_v);
+ _y4m->dst_buf=(unsigned char *)malloc(_y4m->dst_buf_sz);
+ _y4m->aux_buf=(unsigned char *)malloc(_y4m->aux_buf_sz);
+ return 0;
+}
+
+void y4m_input_close(y4m_input *_y4m){
+ free(_y4m->dst_buf);
+ free(_y4m->aux_buf);
+}
+
+int y4m_input_fetch_frame(y4m_input *_y4m,FILE *_fin,vpx_image_t *_img){
+ char frame[6];
+ int pic_sz;
+ int frame_c_w;
+ int frame_c_h;
+ int c_w;
+ int c_h;
+ int c_sz;
+ int ret;
+ /*Read and skip the frame header.*/
+ ret=fread(frame,1,6,_fin);
+ if(ret<6)return 0;
+ if(memcmp(frame,"FRAME",5)){
+ fprintf(stderr,"Loss of framing in Y4M input data\n");
+ return -1;
+ }
+ if(frame[5]!='\n'){
+ char c;
+ int j;
+ for(j=0;j<79&&fread(&c,1,1,_fin)&&c!='\n';j++);
+ if(j==79){
+ fprintf(stderr,"Error parsing Y4M frame header\n");
+ return -1;
+ }
+ }
+ /*Read the frame data that needs no conversion.*/
+ if(fread(_y4m->dst_buf,1,_y4m->dst_buf_read_sz,_fin)!=_y4m->dst_buf_read_sz){
+ fprintf(stderr,"Error reading Y4M frame data.\n");
+ return -1;
+ }
+ /*Read the frame data that does need conversion.*/
+ if(fread(_y4m->aux_buf,1,_y4m->aux_buf_read_sz,_fin)!=_y4m->aux_buf_read_sz){
+ fprintf(stderr,"Error reading Y4M frame data.\n");
+ return -1;
+ }
+ /*Now convert the just read frame.*/
+ (*_y4m->convert)(_y4m,_y4m->dst_buf,_y4m->aux_buf);
+ /*Fill in the frame buffer pointers.
+ We don't use vpx_img_wrap() because it forces padding for odd picture
+ sizes, which would require a separate fread call for every row.*/
+ memset(_img,0,sizeof(*_img));
+ /*Y4M has the planes in Y'CbCr order, which libvpx calls Y, U, and V.*/
+ _img->fmt=IMG_FMT_I420;
+ _img->w=_img->d_w=_y4m->pic_w;
+ _img->h=_img->d_h=_y4m->pic_h;
+ /*This is hard-coded to 4:2:0 for now, as that's all VP8 supports.*/
+ _img->x_chroma_shift=1;
+ _img->y_chroma_shift=1;
+ _img->bps=12;
+ /*Set up the buffer pointers.*/
+ pic_sz=_y4m->pic_w*_y4m->pic_h;
+ c_w=(_y4m->pic_w+_y4m->dst_c_dec_h-1)/_y4m->dst_c_dec_h;
+ c_h=(_y4m->pic_h+_y4m->dst_c_dec_v-1)/_y4m->dst_c_dec_v;
+ c_sz=c_w*c_h;
+ _img->stride[PLANE_Y]=_y4m->pic_w;
+ _img->stride[PLANE_U]=_img->stride[PLANE_V]=c_w;
+ _img->planes[PLANE_Y]=_y4m->dst_buf;
+ _img->planes[PLANE_U]=_y4m->dst_buf+pic_sz;
+ _img->planes[PLANE_V]=_y4m->dst_buf+pic_sz+c_sz;
+ return 0;
+}
