From 2d74541476e268a443b65987d212503dd628bd91 Mon Sep 17 00:00:00 2001
From: Roine Gustafsson <roine@users.sourceforge.net>
Date: Tue, 4 Jan 2005 01:55:50 +0000
Subject: - Writes correct unknown aspect - Adds read and write support for
 yuv422p and yuv444p - New parser will read all well-formed YUV4MPEG2 stream
 headers patch by (Roine Gustafsson <roine users.sourceforge net>)

Originally committed as revision 3800 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavformat/yuv4mpeg.c | 166 ++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 151 insertions(+), 15 deletions(-)

(limited to 'libavformat/yuv4mpeg.c')

diff --git a/libavformat/yuv4mpeg.c b/libavformat/yuv4mpeg.c
index 6ebe185b64..f5c85653dd 100644
--- a/libavformat/yuv4mpeg.c
+++ b/libavformat/yuv4mpeg.c
@@ -30,6 +30,7 @@ static int yuv4_generate_header(AVFormatContext *s, char* buf)
     int width, height;
     int raten, rated, aspectn, aspectd, n;
     char inter;
+    char *colorspace = "";
 
     st = s->streams[0];
     width = st->codec.width;
@@ -40,11 +41,28 @@ static int yuv4_generate_header(AVFormatContext *s, char* buf)
     aspectn = st->codec.sample_aspect_ratio.num;
     aspectd = st->codec.sample_aspect_ratio.den;
     
+    if ( aspectn == 0 && aspectd == 1 ) aspectd = 0;  // 0:0 means unknown
+
     inter = 'p'; /* progressive is the default */
     if (st->codec.coded_frame && st->codec.coded_frame->interlaced_frame) {
         inter = st->codec.coded_frame->top_field_first ? 't' : 'b';
     }
 
+    switch(st->codec.pix_fmt) {
+    case PIX_FMT_YUV411P:
+        colorspace = " C411 XYSCSS=411";
+        break;
+    case PIX_FMT_YUV420P:
+        colorspace = (st->codec.codec_id == CODEC_ID_DVVIDEO)?" C420paldv XYSCSS=420PALDV":" C420mpeg2 XYSCSS=420MPEG2";
+        break;
+    case PIX_FMT_YUV422P:
+        colorspace = " C422 XYSCSS=422";
+        break;
+    case PIX_FMT_YUV444P:
+        colorspace = " C444 XYSCSS=444";
+        break;
+    }
+
     /* construct stream header, if this is the first frame */
     n = snprintf(buf, Y4M_LINE_MAX, "%s W%d H%d F%d:%d I%c A%d:%d%s\n",
                  Y4M_MAGIC,
@@ -53,7 +71,7 @@ static int yuv4_generate_header(AVFormatContext *s, char* buf)
                  raten, rated,
                  inter,
                  aspectn, aspectd,
-		 (st->codec.pix_fmt == PIX_FMT_YUV411P) ? " C411 XYSCSS=411" : " C420mpeg2 XYSCSS=420MPEG2");
+                 colorspace);
 		 
     return n;
 }
@@ -64,7 +82,7 @@ static int yuv4_write_packet(AVFormatContext *s, AVPacket *pkt)
     ByteIOContext *pb = &s->pb;
     AVPicture *picture;
     int* first_pkt = s->priv_data;
-    int width, height;
+    int width, height, h_chroma_shift, v_chroma_shift;
     int i, m;
     char buf2[Y4M_LINE_MAX+1];
     char buf1[20];
@@ -97,8 +115,11 @@ static int yuv4_write_packet(AVFormatContext *s, AVPacket *pkt)
         ptr += picture->linesize[0];
     }
 
-    height >>= 1;
-    width >>= 1;
+    // Adjust for smaller Cb and Cr planes
+    avcodec_get_chroma_sub_sample(st->codec.pix_fmt, &h_chroma_shift, &v_chroma_shift);
+    width >>= h_chroma_shift;
+    height >>= v_chroma_shift;
+
     ptr1 = picture->data[1];
     ptr2 = picture->data[2];
     for(i=0;i<height;i++) {		/* Cb */
@@ -121,10 +142,12 @@ static int yuv4_write_header(AVFormatContext *s)
         return AVERROR_IO;
     
     if (s->streams[0]->codec.pix_fmt == PIX_FMT_YUV411P) {
-        av_log(s, AV_LOG_ERROR, "Warning: generating non-standard 4:1:1 YUV stream, some mjpegtools might not work.\n");
+        av_log(s, AV_LOG_ERROR, "Warning: generating rarely used 4:1:1 YUV stream, some mjpegtools might not work.\n");
     } 
-    else if (s->streams[0]->codec.pix_fmt != PIX_FMT_YUV420P) {
-        av_log(s, AV_LOG_ERROR, "ERROR: yuv4mpeg only handles 4:2:0, 4:1:1 YUV data. Use -pix_fmt to select one.\n");
+    else if ((s->streams[0]->codec.pix_fmt != PIX_FMT_YUV420P) && 
+             (s->streams[0]->codec.pix_fmt != PIX_FMT_YUV422P) && 
+             (s->streams[0]->codec.pix_fmt != PIX_FMT_YUV444P)) {
+        av_log(s, AV_LOG_ERROR, "ERROR: yuv4mpeg only handles 4:4:4, 4:2:2, 4:2:0 and 4:1:1 planar YUV data. Use -pix_fmt to select one.\n");
 	return AVERROR_IO;
     }
     
@@ -154,29 +177,142 @@ AVOutputFormat yuv4mpegpipe_oformat = {
 
 /* Header size increased to allow room for optional flags */
 #define MAX_YUV4_HEADER 80
-#define MAX_FRAME_HEADER 10
+#define MAX_FRAME_HEADER 80
 
 static int yuv4_read_header(AVFormatContext *s, AVFormatParameters *ap)
 {
-    char header[MAX_YUV4_HEADER+1];
+    char header[MAX_YUV4_HEADER+10];  // Include headroom for the longest option
+    char *tokstart,*tokend,*header_end;
     int i;
     ByteIOContext *pb = &s->pb;
-    int width, height, raten, rated, aspectn, aspectd;
-    char lacing;
+    int width=-1, height=-1, raten=0, rated=0, aspectn=0, aspectd=0,interlaced_frame=0,top_field_first=0;
+    enum PixelFormat pix_fmt=PIX_FMT_NB,alt_pix_fmt=PIX_FMT_NB;
     AVStream *st;
     
     for (i=0; i<MAX_YUV4_HEADER; i++) {
         header[i] = get_byte(pb);
 	if (header[i] == '\n') {
-	    header[i+1] = 0;
+	    header[i+1] = 0x20;  // Add a space after last option. Makes parsing "444" vs "444alpha" easier.
+	    header[i+2] = 0;
 	    break;
 	}
     }
     if (i == MAX_YUV4_HEADER) return -1;
     if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC))) return -1;
-    sscanf(header+strlen(Y4M_MAGIC), " W%d H%d F%d:%d I%c A%d:%d",
-           &width, &height, &raten, &rated, &lacing, &aspectn, &aspectd);
+
+    header_end = &header[i+1]; // Include space
+    for(tokstart = &header[strlen(Y4M_MAGIC) + 1]; tokstart < header_end; tokstart++) {
+        if (*tokstart==0x20) continue;
+        switch (*tokstart++) {
+        case 'W': // Width. Required.
+            width = strtol(tokstart, &tokend, 10);
+            tokstart=tokend;
+            break;
+        case 'H': // Height. Required.
+            height = strtol(tokstart, &tokend, 10);
+            tokstart=tokend;
+            break;
+        case 'C': // Color space
+            if (strncmp("420jpeg",tokstart,7)==0)
+                pix_fmt = PIX_FMT_YUV420P;
+            else if (strncmp("420mpeg2",tokstart,8)==0)
+                pix_fmt = PIX_FMT_YUV420P;
+            else if (strncmp("420paldv", tokstart, 8)==0)
+                pix_fmt = PIX_FMT_YUV420P;
+            else if (strncmp("411", tokstart, 3)==0)
+                pix_fmt = PIX_FMT_YUV411P;
+            else if (strncmp("422", tokstart, 3)==0)
+                pix_fmt = PIX_FMT_YUV422P;
+            else if (strncmp("444alpha", tokstart, 8)==0) {
+                av_log(s, AV_LOG_ERROR, "Cannot handle 4:4:4:4 YUV4MPEG stream.\n");
+                return -1;
+            } else if (strncmp("444", tokstart, 3)==0)
+                pix_fmt = PIX_FMT_YUV444P;
+            else if (strncmp("mono",tokstart, 4)==0) {
+                av_log(s, AV_LOG_ERROR, "Cannot handle luma only YUV4MPEG stream.\n");
+                return -1;
+            } else {
+                av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains an unknown pixel format.\n");
+                return -1;
+            }
+            while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
+            break;
+        case 'I': // Interlace type
+            switch (*tokstart++){
+            case '?':
+                break;
+            case 'p':
+                interlaced_frame=0;
+                break;
+            case 't':
+                interlaced_frame=1;
+                top_field_first=1;
+                break;
+            case 'b':
+                interlaced_frame=1;
+                top_field_first=0;
+                break;
+            case 'm':
+                av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains mixed interlaced and non-interlaced frames.\n");
+                return -1;
+            default:
+                av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
+                return -1;
+            }
+            break;
+        case 'F': // Frame rate
+            sscanf(tokstart,"%d:%d",&raten,&rated); // 0:0 if unknown
+            while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
+            break;
+        case 'A': // Pixel aspect
+            sscanf(tokstart,"%d:%d",&aspectn,&aspectd); // 0:0 if unknown
+            while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
+            break;
+        case 'X': // Vendor extensions
+            if (strncmp("YSCSS=",tokstart,6)==0) {
+                // Older nonstandard pixel format representation
+                tokstart+=6;
+                if (strncmp("420JPEG",tokstart,7)==0)
+                    alt_pix_fmt=PIX_FMT_YUV420P;
+                else if (strncmp("420MPEG2",tokstart,8)==0)
+                    alt_pix_fmt=PIX_FMT_YUV420P;
+                else if (strncmp("420PALDV",tokstart,8)==0)
+                    alt_pix_fmt=PIX_FMT_YUV420P;
+                else if (strncmp("411",tokstart,3)==0)
+                    alt_pix_fmt=PIX_FMT_YUV411P;
+                else if (strncmp("422",tokstart,3)==0)
+                    alt_pix_fmt=PIX_FMT_YUV422P;
+                else if (strncmp("444",tokstart,3)==0)
+                    alt_pix_fmt=PIX_FMT_YUV444P;
+            }
+            while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
+            break;
+        }
+    }            
+
+    if ((width == -1) || (height == -1)) {
+        av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
+        return -1;        
+    }
     
+    if (pix_fmt == PIX_FMT_NB) {
+        if (alt_pix_fmt == PIX_FMT_NB)
+            pix_fmt = PIX_FMT_YUV420P;
+        else
+            pix_fmt = alt_pix_fmt;
+    }
+
+    if (raten == 0 && rated == 0) {
+        // Frame rate unknown
+        raten = 25;
+        rated = 1;
+    }
+
+    if (aspectn == 0 && aspectd == 0) {
+        // Pixel aspect unknown
+        aspectd = 1;
+    }
+        
     st = av_new_stream(s, 0);
     st = s->streams[0];
     st->codec.width = width;
@@ -184,7 +320,7 @@ static int yuv4_read_header(AVFormatContext *s, AVFormatParameters *ap)
     av_reduce(&raten, &rated, raten, rated, (1UL<<31)-1);
     st->codec.frame_rate = raten;
     st->codec.frame_rate_base = rated;
-    st->codec.pix_fmt = PIX_FMT_YUV420P;
+    st->codec.pix_fmt = pix_fmt;
     st->codec.codec_type = CODEC_TYPE_VIDEO;
     st->codec.codec_id = CODEC_ID_RAWVIDEO;
     st->codec.sample_aspect_ratio= (AVRational){aspectn, aspectd};
-- 
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