v210: Use separate sample_factors

The 10bit and the 8bit functions can now be implemented to process
a different amount of samples.

And while at it simplify a little the code.

libavcodec/v210enc.c

@@ -86,7 +86,8 @@ av_cold void ff_v210enc_init(V210EncContext *s)
 {
     s->pack_line_8  = v210_planar_pack_8_c;
     s->pack_line_10 = v210_planar_pack_10_c;
-    s->sample_factor = 1;
+    s->sample_factor_8  = 1;
+    s->sample_factor_10 = 1;
 
     if (ARCH_X86)
         ff_v210enc_init_x86(s);
@@ -133,15 +134,19 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
         const uint16_t *y = (const uint16_t *)pic->data[0];
         const uint16_t *u = (const uint16_t *)pic->data[1];
         const uint16_t *v = (const uint16_t *)pic->data[2];
+
+        const int sample_size = 6 * s->sample_factor_10;
+        const int sample_w    = avctx->width / sample_size;
+
         for (h = 0; h < avctx->height; h++) {
             uint32_t val;
-            w = (avctx->width / (6 * s->sample_factor)) * 6 * s->sample_factor;
+            w = sample_w * sample_size;
             s->pack_line_10(y, u, v, dst, w);
 
             y += w;
             u += w >> 1;
             v += w >> 1;
-            dst += (w / (6 * s->sample_factor)) * 16 * s->sample_factor;
+            dst += sample_w * 16 * s->sample_factor_10;
 
             for (; w < avctx->width - 5; w += 6) {
                 WRITE_PIXELS(u, y, v);
@@ -178,15 +183,19 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
         const uint8_t *y = pic->data[0];
         const uint8_t *u = pic->data[1];
         const uint8_t *v = pic->data[2];
+
+        const int sample_size = 12 * s->sample_factor_8;
+        const int sample_w    = avctx->width / sample_size;
+
         for (h = 0; h < avctx->height; h++) {
             uint32_t val;
-            w = (avctx->width / (12 * s->sample_factor)) * 12 * s->sample_factor;
+            w = sample_w * sample_size;
             s->pack_line_8(y, u, v, dst, w);
 
             y += w;
             u += w >> 1;
             v += w >> 1;
-            dst += (w / (12 * s->sample_factor)) * 32 * s->sample_factor;
+            dst += sample_w * 32 * s->sample_factor_8;
 
             for (; w < avctx->width - 5; w += 6) {
                 WRITE_PIXELS8(u, y, v);

libavcodec/v210enc.h

@@ -28,7 +28,8 @@ typedef struct V210EncContext {
                         const uint8_t *v, uint8_t *dst, ptrdiff_t width);
     void (*pack_line_10)(const uint16_t *y, const uint16_t *u,
                          const uint16_t *v, uint8_t *dst, ptrdiff_t width);
-    int sample_factor;
+    int sample_factor_8;
+    int sample_factor_10;
 } V210EncContext;
 
 void ff_v210enc_init(V210EncContext *s);

libavcodec/x86/v210enc_init.c

@@ -46,8 +46,9 @@ av_cold void ff_v210enc_init_x86(V210EncContext *s)
         s->pack_line_8 = ff_v210_planar_pack_8_avx;
 
     if (EXTERNAL_AVX2(cpu_flags)) {
-        s->sample_factor = 2;
-        s->pack_line_8   = ff_v210_planar_pack_8_avx2;
-        s->pack_line_10  = ff_v210_planar_pack_10_avx2;
+        s->sample_factor_8  = 2;
+        s->pack_line_8      = ff_v210_planar_pack_8_avx2;
+        s->sample_factor_10 = 2;
+        s->pack_line_10     = ff_v210_planar_pack_10_avx2;
     }
 }