Support reading packed YUV422 10bit samples from Sveriges Television AB (SVT)

which have AFAIK been created for the jvt:
ftp://vqeg.its.bldrdoc.gov/HDTV/SVT_exports/SVT_YUV10_Exports_/NewMobCal_YUV10_720p5994_/
I have called the format v210x due to its similarity to v210, note though I have
not confirmed that v210x is different from actual v210 samples it just is
different from the description of v210 I am aware of.

Originally committed as revision 18654 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/Makefile

@@ -229,6 +229,7 @@ OBJS-$(CONFIG_TSCC_DECODER)            += tscc.o msrledec.o
 OBJS-$(CONFIG_TTA_DECODER)             += tta.o
 OBJS-$(CONFIG_TXD_DECODER)             += txd.o s3tc.o
 OBJS-$(CONFIG_ULTI_DECODER)            += ulti.o
+OBJS-$(CONFIG_V210X_DECODER)           += v210x.o
 OBJS-$(CONFIG_VB_DECODER)              += vb.o
 OBJS-$(CONFIG_VC1_DECODER)             += vc1.o vc1data.o vc1dsp.o msmpeg4data.o h263dec.o h263.o intrax8.o intrax8dsp.o error_resilience.o mpegvideo.o msmpeg4.o
 OBJS-$(CONFIG_VC1_VAAPI_HWACCEL)       += vc1.o vc1data.o vc1dsp.o msmpeg4data.o h263dec.o h263.o intrax8.o intrax8dsp.o error_resilience.o mpegvideo.o msmpeg4.o vaapi.o vaapi_vc1.o

libavcodec/allcodecs.c

@@ -167,6 +167,7 @@ void avcodec_register_all(void)
     REGISTER_DECODER (TSCC, tscc);
     REGISTER_DECODER (TXD, txd);
     REGISTER_DECODER (ULTI, ulti);
+    REGISTER_DECODER (V210X, v210x);
     REGISTER_DECODER (VB, vb);
     REGISTER_DECODER (VC1, vc1);
     REGISTER_DECODER (VC1_VDPAU, vc1_vdpau);

libavcodec/avcodec.h

@@ -193,6 +193,7 @@ enum CodecID {
     CODEC_ID_TQI,
     CODEC_ID_AURA,
     CODEC_ID_AURA2,
+    CODEC_ID_V210X,
 
     /* various PCM "codecs" */
     CODEC_ID_PCM_S16LE= 0x10000,

libavcodec/v210x.c

@@ -0,0 +1,137 @@
+/*
+ * Copyright (C) 2009 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * 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
+ */
+
+#include "avcodec.h"
+#include "libavutil/bswap.h"
+
+static av_cold int decode_init(AVCodecContext *avctx)
+{
+    if(avctx->width & 1){
+        av_log(avctx, AV_LOG_ERROR, "v210x needs even width\n");
+        return -1;
+    }
+    if(avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0)
+        return -1;
+    avctx->pix_fmt = PIX_FMT_YUV422P16;
+    avctx->bits_per_raw_sample= 10;
+
+    avctx->coded_frame= avcodec_alloc_frame();
+
+    return 0;
+}
+
+static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
+{
+    int y=0;
+    int width= avctx->width;
+    AVFrame *pic= avctx->coded_frame;
+    const uint32_t *src= avpkt->data;
+    uint16_t *ydst, *udst, *vdst, *yend;
+
+    if(pic->data[0])
+        avctx->release_buffer(avctx, pic);
+
+    if(avpkt->size < avctx->width * avctx->height * 8 / 3){
+        av_log(avctx, AV_LOG_ERROR, "Packet too small\n");
+        return -1;
+    }
+
+    if(avpkt->size > avctx->width * avctx->height * 8 / 3){
+        av_log(avctx, AV_LOG_ERROR, "Probably padded data, need sample!\n");
+    }
+
+    pic->reference= 0;
+    if(avctx->get_buffer(avctx, pic) < 0)
+        return -1;
+
+    ydst= pic->data[0];
+    udst= pic->data[1];
+    vdst= pic->data[2];
+    yend= ydst + width;
+    pic->pict_type= FF_I_TYPE;
+    pic->key_frame= 1;
+
+    for(;;){
+        uint32_t v= be2me_32(*src++);
+        *udst++= (v>>16) & 0xFFC0;
+        *ydst++= (v>>6 ) & 0xFFC0;
+        *vdst++= (v<<4 ) & 0xFFC0;
+
+        v= be2me_32(*src++);
+        *ydst++= (v>>16) & 0xFFC0;
+
+        if(ydst >= yend){
+            ydst+= pic->linesize[0]/2 - width;
+            udst+= pic->linesize[1]/2 - width/2;
+            vdst+= pic->linesize[2]/2 - width/2;
+            yend= ydst + width;
+            if(++y >= avctx->height)
+                break;
+        }
+
+        *udst++= (v>>6 ) & 0xFFC0;
+        *ydst++= (v<<4 ) & 0xFFC0;
+
+        v= be2me_32(*src++);
+        *vdst++= (v>>16) & 0xFFC0;
+        *ydst++= (v>>6 ) & 0xFFC0;
+
+        if(ydst >= yend){
+            ydst+= pic->linesize[0]/2 - width;
+            udst+= pic->linesize[1]/2 - width/2;
+            vdst+= pic->linesize[2]/2 - width/2;
+            yend= ydst + width;
+            if(++y >= avctx->height)
+                break;
+        }
+
+        *udst++= (v<<4 ) & 0xFFC0;
+
+        v= be2me_32(*src++);
+        *ydst++= (v>>16) & 0xFFC0;
+        *vdst++= (v>>6 ) & 0xFFC0;
+        *ydst++= (v<<4 ) & 0xFFC0;
+        if(ydst >= yend){
+            ydst+= pic->linesize[0]/2 - width;
+            udst+= pic->linesize[1]/2 - width/2;
+            vdst+= pic->linesize[2]/2 - width/2;
+            yend= ydst + width;
+            if(++y >= avctx->height)
+                break;
+        }
+    }
+
+    *data_size=sizeof(AVFrame);
+    *(AVFrame*)data= *avctx->coded_frame;
+
+    return avpkt->size;
+}
+
+AVCodec v210x_decoder = {
+    "v210x",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_V210X,
+    0,
+    decode_init,
+    NULL,
+    NULL,
+    decode_frame,
+    CODEC_CAP_DR1,
+};