cosmetics: fix some typos

Change-Id: I0d6efebd817815139db5ae87236fd8911df4d53c

src/enc/alpha.c

@@ -201,7 +201,7 @@ static uint32_t GetFilterMap(const uint8_t* alpha, int width, int height,
     const int kMinColorsForFilterNone = 16;
     const int kMaxColorsForFilterNone = 192;
     const int num_colors = GetNumColors(alpha, width, height, width);
-    // For low number of colors, NONE yeilds better compression.
+    // For low number of colors, NONE yields better compression.
     filter = (num_colors <= kMinColorsForFilterNone) ? WEBP_FILTER_NONE :
              EstimateBestFilter(alpha, width, height, width);
     bit_map |= 1 << filter;

src/enc/backward_references.c

@@ -156,7 +156,7 @@ static void GetParamsForHashChainFindCopy(int quality, int xsize,
   *window_size = (max_window_size > WINDOW_SIZE) ? WINDOW_SIZE
                : max_window_size;
   *iter_pos = 8 + (quality >> 3);
-  // For lower entropy images, the rigourous search loop in HashChainFindCopy
+  // For lower entropy images, the rigorous search loop in HashChainFindCopy
   // can be relaxed.
   *iter_limit = (cache_bits > 0) ? iter_neg : iter_neg / 2;
 }

src/enc/frame.c

@@ -739,7 +739,7 @@ static double GetPSNR(uint64_t mse, uint64_t size) {
 //------------------------------------------------------------------------------
 //  StatLoop(): only collect statistics (number of skips, token usage, ...).
 //  This is used for deciding optimal probabilities. It also modifies the
-//  quantizer value if some target (size, PNSR) was specified.
+//  quantizer value if some target (size, PSNR) was specified.
 
 static void SetLoopParams(VP8Encoder* const enc, float q) {
   // Make sure the quality parameter is inside valid bounds

src/enc/iterator.c

@@ -285,7 +285,7 @@ void VP8IteratorBytesToNz(VP8EncIterator* const it) {
 #undef BIT
 
 //------------------------------------------------------------------------------
-// Advance to the next position, doing the bookeeping.
+// Advance to the next position, doing the bookkeeping.
 
 void VP8IteratorSaveBoundary(VP8EncIterator* const it) {
   VP8Encoder* const enc = it->enc_;

src/enc/quant.c

@@ -25,7 +25,7 @@
 
 #define MID_ALPHA 64      // neutral value for susceptibility
 #define MIN_ALPHA 30      // lowest usable value for susceptibility
-#define MAX_ALPHA 100     // higher meaninful value for susceptibility
+#define MAX_ALPHA 100     // higher meaningful value for susceptibility
 
 #define SNS_TO_DQ 0.9     // Scaling constant between the sns value and the QP
                           // power-law modulation. Must be strictly less than 1.
@@ -292,7 +292,7 @@ static double QualityToCompression(double c) {
   // exponent is somewhere between 2.8 and 3.2, but we're mostly interested
   // in the mid-quant range. So we scale the compressibility inversely to
   // this power-law: quant ~= compression ^ 1/3. This law holds well for
-  // low quant. Finer modelling for high-quant would make use of kAcTable[]
+  // low quant. Finer modeling for high-quant would make use of kAcTable[]
   // more explicitly.
   const double v = pow(linear_c, 1 / 3.);
   return v;
@@ -814,7 +814,7 @@ static int ReconstructUV(VP8EncIterator* const it, VP8ModeScore* const rd,
 
 //------------------------------------------------------------------------------
 // RD-opt decision. Reconstruct each modes, evalue distortion and bit-cost.
-// Pick the mode is lower RD-cost = Rate + lamba * Distortion.
+// Pick the mode is lower RD-cost = Rate + lambda * Distortion.
 
 static void StoreMaxDelta(VP8SegmentInfo* const dqm, const int16_t DCs[16]) {
   // We look at the first three AC coefficients to determine what is the average

src/enc/vp8enci.h

@@ -256,7 +256,7 @@ typedef struct {
   int lambda_trellis_i16_, lambda_trellis_i4_, lambda_trellis_uv_;
 } VP8SegmentInfo;
 
-// Handy transcient struct to accumulate score and info during RD-optimization
+// Handy transient struct to accumulate score and info during RD-optimization
 // and mode evaluation.
 typedef struct {
   score_t D, SD;              // Distortion, spectral distortion

src/enc/webpenc.c

@@ -157,7 +157,7 @@ static void MapConfigToTools(VP8Encoder* const enc) {
 //             non-zero: 196
 //             lf-stats: 2048
 //                total: 68635
-// Transcient object sizes:
+// Transient object sizes:
 //       VP8EncIterator: 352
 //         VP8ModeScore: 912
 //       VP8SegmentInfo: 532