png: K&R formatting cosmetics

4 files changed, 209 insertions, 185 deletions

diff --git a/libavcodec/png.c b/libavcodec/png.c
index 65d696476a..cd75dc1815 100644
--- a/libavcodec/png.c
+++ b/libavcodec/png.c
@@ -22,8 +22,8 @@
 #include "bytestream.h"
 #include "png.h"
 
-const uint8_t ff_pngsig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
-const uint8_t ff_mngsig[8] = {138, 77, 78, 71, 13, 10, 26, 10};
+const uint8_t ff_pngsig[8] = { 137, 80, 78, 71, 13, 10, 26, 10 };
+const uint8_t ff_mngsig[8] = { 138, 77, 78, 71, 13, 10, 26, 10 };
 
 /* Mask to determine which y pixels are valid in a pass */
 const uint8_t ff_png_pass_ymask[NB_PASSES] = {
@@ -75,7 +75,7 @@ int ff_png_pass_row_size(int pass, int bits_per_pixel, int width)
     xmin = ff_png_pass_xmin[pass];
     if (width <= xmin)
         return 0;
-    shift = ff_png_pass_xshift[pass];
+    shift      = ff_png_pass_xshift[pass];
     pass_width = (width - xmin + (1 << shift) - 1) >> shift;
     return (pass_width * bits_per_pixel + 7) >> 3;
 }
diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c
index e6462967f6..fe5590deee 100644
--- a/libavcodec/pngdec.c
+++ b/libavcodec/pngdec.c
@@ -73,8 +73,8 @@ static const uint8_t png_pass_dsp_mask[NB_PASSES] = {
 };
 
 /* NOTE: we try to construct a good looking image at each pass. width
-   is the original image width. We also do pixel format conversion at
-   this stage */
+ * is the original image width. We also do pixel format conversion at
+ * this stage */
 static void png_put_interlaced_row(uint8_t *dst, int width,
                                    int bits_per_pixel, int pass,
                                    int color_type, const uint8_t *src)
@@ -117,7 +117,7 @@ static void png_put_interlaced_row(uint8_t *dst, int width,
                     s += bpp;
             }
         } else {
-            for(x = 0; x < width; x++) {
+            for (x = 0; x < width; x++) {
                 j = x & 7;
                 if ((dsp_mask << j) & 0x80) {
                     memcpy(d, s, bpp);
@@ -131,7 +131,8 @@ static void png_put_interlaced_row(uint8_t *dst, int width,
     }
 }
 
-void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top, int w, int bpp)
+void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top,
+                                 int w, int bpp)
 {
     int i;
     for (i = 0; i < w; i++) {
@@ -158,34 +159,45 @@ void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top, int w
     }
 }
 
-#define UNROLL1(bpp, op) {\
-                 r = dst[0];\
-    if(bpp >= 2) g = dst[1];\
-    if(bpp >= 3) b = dst[2];\
-    if(bpp >= 4) a = dst[3];\
-    for(; i < size; i+=bpp) {\
-        dst[i+0] = r = op(r, src[i+0], last[i+0]);\
-        if(bpp == 1) continue;\
-        dst[i+1] = g = op(g, src[i+1], last[i+1]);\
-        if(bpp == 2) continue;\
-        dst[i+2] = b = op(b, src[i+2], last[i+2]);\
-        if(bpp == 3) continue;\
-        dst[i+3] = a = op(a, src[i+3], last[i+3]);\
-    }\
+#define UNROLL1(bpp, op) {                                                    \
+        r = dst[0];                                                           \
+        if (bpp >= 2)                                                         \
+            g = dst[1];                                                       \
+        if (bpp >= 3)                                                         \
+            b = dst[2];                                                       \
+        if (bpp >= 4)                                                         \
+            a = dst[3];                                                       \
+        for (; i < size; i += bpp) {                                          \
+            dst[i + 0] = r = op(r, src[i + 0], last[i + 0]);                  \
+            if (bpp == 1)                                                     \
+                continue;                                                     \
+            dst[i + 1] = g = op(g, src[i + 1], last[i + 1]);                  \
+            if (bpp == 2)                                                     \
+                continue;                                                     \
+            dst[i + 2] = b = op(b, src[i + 2], last[i + 2]);                  \
+            if (bpp == 3)                                                     \
+                continue;                                                     \
+            dst[i + 3] = a = op(a, src[i + 3], last[i + 3]);                  \
+        }                                                                     \
 }
 
-#define UNROLL_FILTER(op)\
-         if(bpp == 1) UNROLL1(1, op)\
-    else if(bpp == 2) UNROLL1(2, op)\
-    else if(bpp == 3) UNROLL1(3, op)\
-    else if(bpp == 4) UNROLL1(4, op)\
-    else {\
-        for (; i < size; i += bpp) {\
-            int j;\
-            for (j = 0; j < bpp; j++)\
-                dst[i+j] = op(dst[i+j-bpp], src[i+j], last[i+j]);\
-        }\
-    }
+#define UNROLL_FILTER(op)                                                     \
+    if (bpp == 1)                                                             \
+        UNROLL1(1, op)                                                        \
+        else if (bpp == 2)                                                    \
+            UNROLL1(2, op)                                                    \
+            else if (bpp == 3)                                                \
+                UNROLL1(3, op)                                                \
+                else if (bpp == 4)                                            \
+                    UNROLL1(4, op)                                            \
+                    else {                                                    \
+                        for (; i < size; i += bpp) {                          \
+                            int j;                                            \
+                            for (j = 0; j < bpp; j++)                         \
+                                dst[i + j] = op(dst[i + j - bpp],             \
+                                                src[i + j], last[i + j]);     \
+                        }                                                     \
+                    }
 
 /* NOTE: 'dst' can be equal to 'last' */
 static void png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type,
@@ -198,18 +210,17 @@ static void png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type,
         memcpy(dst, src, size);
         break;
     case PNG_FILTER_VALUE_SUB:
-        for (i = 0; i < bpp; i++) {
+        for (i = 0; i < bpp; i++)
             dst[i] = src[i];
-        }
         if (bpp == 4) {
-            p = *(int*)dst;
+            p = *(int *)dst;
             for (; i < size; i += bpp) {
-                int s = *(int*)(src + i);
+                int s = *(int *)(src + i);
                 p = ((s & 0x7f7f7f7f) + (p & 0x7f7f7f7f)) ^ ((s ^ p) & 0x80808080);
-                *(int*)(dst + i) = p;
+                *(int *)(dst + i) = p;
             }
         } else {
-#define OP_SUB(x,s,l) x+s
+#define OP_SUB(x, s, l) x + s
             UNROLL_FILTER(OP_SUB);
         }
         break;
@@ -218,19 +229,20 @@ static void png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type,
         break;
     case PNG_FILTER_VALUE_AVG:
         for (i = 0; i < bpp; i++) {
-            p = (last[i] >> 1);
+            p      = (last[i] >> 1);
             dst[i] = p + src[i];
         }
-#define OP_AVG(x,s,l) (((x + l) >> 1) + s) & 0xff
+#define OP_AVG(x, s, l) (((x + l) >> 1) + s) & 0xff
         UNROLL_FILTER(OP_AVG);
         break;
     case PNG_FILTER_VALUE_PAETH:
         for (i = 0; i < bpp; i++) {
-            p = last[i];
+            p      = last[i];
             dst[i] = p + src[i];
         }
         if (bpp > 1 && size > 4) {
-            // would write off the end of the array if we let it process the last pixel with bpp=3
+            /* would write off the end of the array if we let it process
+             * the last pixel with bpp=3 */
             int w = bpp == 4 ? size : size - 3;
             dsp->add_paeth_prediction(dst + i, src + i, last + i, w - i, bpp);
             i = w;
@@ -256,13 +268,14 @@ static av_always_inline void convert_to_rgb32_loco(uint8_t *dst,
             r = (r + g) & 0xff;
             b = (b + g) & 0xff;
         }
-        *(uint32_t *)dst = (a << 24) | (r << 16) | (g << 8) | b;
+        *(uint32_t *) dst = (a << 24) | (r << 16) | (g << 8) | b;
         dst += 4;
         src += 4;
     }
 }
 
-static void convert_to_rgb32(uint8_t *dst, const uint8_t *src, int width, int loco)
+static void convert_to_rgb32(uint8_t *dst, const uint8_t *src,
+                             int width, int loco)
 {
     if (loco)
         convert_to_rgb32_loco(dst, src, width, 1);
@@ -292,8 +305,9 @@ static void png_handle_row(PNGDecContext *s)
         if (s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
             png_filter_row(&s->dsp, s->tmp_row, s->crow_buf[0], s->crow_buf + 1,
                            s->last_row, s->row_size, s->bpp);
-            convert_to_rgb32(ptr, s->tmp_row, s->width, s->filter_type == PNG_FILTER_TYPE_LOCO);
-            FFSWAP(uint8_t*, s->last_row, s->tmp_row);
+            convert_to_rgb32(ptr, s->tmp_row, s->width,
+                             s->filter_type == PNG_FILTER_TYPE_LOCO);
+            FFSWAP(uint8_t *, s->last_row, s->tmp_row);
         } else {
             /* in normal case, we avoid one copy */
             if (s->y == 0)
@@ -321,12 +335,12 @@ static void png_handle_row(PNGDecContext *s)
             ptr = s->image_buf + s->image_linesize * s->y;
             if ((ff_png_pass_ymask[s->pass] << (s->y & 7)) & 0x80) {
                 /* if we already read one row, it is time to stop to
-                   wait for the next one */
+                 * wait for the next one */
                 if (got_line)
                     break;
                 png_filter_row(&s->dsp, s->tmp_row, s->crow_buf[0], s->crow_buf + 1,
                                s->last_row, s->pass_row_size, s->bpp);
-                FFSWAP(uint8_t*, s->last_row, s->tmp_row);
+                FFSWAP(uint8_t *, s->last_row, s->tmp_row);
                 got_line = 1;
             }
             if ((png_pass_dsp_ymask[s->pass] << (s->y & 7)) & 0x80) {
@@ -344,8 +358,8 @@ static void png_handle_row(PNGDecContext *s)
                         s->pass++;
                         s->y = 0;
                         s->pass_row_size = ff_png_pass_row_size(s->pass,
-                                                             s->bits_per_pixel,
-                                                             s->width);
+                                                                s->bits_per_pixel,
+                                                                s->width);
                         s->crow_size = s->pass_row_size + 1;
                         if (s->pass_row_size != 0)
                             break;
@@ -354,7 +368,7 @@ static void png_handle_row(PNGDecContext *s)
                 }
             }
         }
-    the_end: ;
+the_end:;
     }
 }
 
@@ -379,7 +393,8 @@ static int png_decode_idat(PNGDecContext *s, int length)
             s->zstream.next_out  = s->crow_buf;
         }
         if (ret == Z_STREAM_END && s->zstream.avail_in > 0) {
-            av_log(NULL, AV_LOG_WARNING, "%d undecompressed bytes left in buffer\n", s->zstream.avail_in);
+            av_log(NULL, AV_LOG_WARNING,
+                   "%d undecompressed bytes left in buffer\n", s->zstream.avail_in);
             return 0;
         }
     }
@@ -390,11 +405,11 @@ static int decode_frame(AVCodecContext *avctx,
                         void *data, int *got_frame,
                         AVPacket *avpkt)
 {
-    PNGDecContext * const s = avctx->priv_data;
-    const uint8_t *buf      = avpkt->data;
-    int buf_size            = avpkt->size;
-    AVFrame *p              = data;
-    uint8_t *crow_buf_base  = NULL;
+    PNGDecContext *const s = avctx->priv_data;
+    const uint8_t *buf     = avpkt->data;
+    int buf_size           = avpkt->size;
+    AVFrame *p             = data;
+    uint8_t *crow_buf_base = NULL;
     uint32_t tag, length;
     int ret;
 
@@ -444,7 +459,7 @@ static int decode_frame(AVCodecContext *avctx,
             bytestream2_skip(&s->gb, 4); /* crc */
             s->state |= PNG_IHDR;
             av_dlog(avctx, "width=%d height=%d depth=%d color_type=%d "
-                    "compression_type=%d filter_type=%d interlace_type=%d\n",
+                           "compression_type=%d filter_type=%d interlace_type=%d\n",
                     s->width, s->height, s->bit_depth, s->color_type,
                     s->compression_type, s->filter_type, s->interlace_type);
             break;
@@ -501,10 +516,10 @@ static int decode_frame(AVCodecContext *avctx,
                 if (!s->interlace_type) {
                     s->crow_size = s->row_size + 1;
                 } else {
-                    s->pass = 0;
+                    s->pass          = 0;
                     s->pass_row_size = ff_png_pass_row_size(s->pass,
-                                                         s->bits_per_pixel,
-                                                         s->width);
+                                                            s->bits_per_pixel,
+                                                            s->width);
                     s->crow_size = s->pass_row_size + 1;
                 }
                 av_dlog(avctx, "row_size=%d crow_size =%d\n",
@@ -540,42 +555,41 @@ static int decode_frame(AVCodecContext *avctx,
             bytestream2_skip(&s->gb, 4); /* crc */
             break;
         case MKTAG('P', 'L', 'T', 'E'):
-            {
-                int n, i, r, g, b;
-
-                if ((length % 3) != 0 || length > 256 * 3)
-                    goto skip_tag;
-                /* read the palette */
-                n = length / 3;
-                for (i = 0; i < n; i++) {
-                    r = bytestream2_get_byte(&s->gb);
-                    g = bytestream2_get_byte(&s->gb);
-                    b = bytestream2_get_byte(&s->gb);
-                    s->palette[i] = (0xff << 24) | (r << 16) | (g << 8) | b;
-                }
-                for (; i < 256; i++) {
-                    s->palette[i] = (0xff << 24);
-                }
-                s->state |= PNG_PLTE;
-                bytestream2_skip(&s->gb, 4); /* crc */
+        {
+            int n, i, r, g, b;
+
+            if ((length % 3) != 0 || length > 256 * 3)
+                goto skip_tag;
+            /* read the palette */
+            n = length / 3;
+            for (i = 0; i < n; i++) {
+                r = bytestream2_get_byte(&s->gb);
+                g = bytestream2_get_byte(&s->gb);
+                b = bytestream2_get_byte(&s->gb);
+                s->palette[i] = (0xff << 24) | (r << 16) | (g << 8) | b;
             }
-            break;
+            for (; i < 256; i++)
+                s->palette[i] = (0xff << 24);
+            s->state |= PNG_PLTE;
+            bytestream2_skip(&s->gb, 4);     /* crc */
+        }
+        break;
         case MKTAG('t', 'R', 'N', 'S'):
-            {
-                int v, i;
-
-                /* read the transparency. XXX: Only palette mode supported */
-                if (s->color_type != PNG_COLOR_TYPE_PALETTE ||
-                    length > 256 ||
-                    !(s->state & PNG_PLTE))
-                    goto skip_tag;
-                for (i = 0; i < length; i++) {
-                    v = bytestream2_get_byte(&s->gb);
-                    s->palette[i] = (s->palette[i] & 0x00ffffff) | (v << 24);
-                }
-                bytestream2_skip(&s->gb, 4); /* crc */
+        {
+            int v, i;
+
+            /* read the transparency. XXX: Only palette mode supported */
+            if (s->color_type != PNG_COLOR_TYPE_PALETTE ||
+                length > 256 ||
+                !(s->state & PNG_PLTE))
+                goto skip_tag;
+            for (i = 0; i < length; i++) {
+                v = bytestream2_get_byte(&s->gb);
+                s->palette[i] = (s->palette[i] & 0x00ffffff) | (v << 24);
             }
-            break;
+            bytestream2_skip(&s->gb, 4);     /* crc */
+        }
+        break;
         case MKTAG('I', 'E', 'N', 'D'):
             if (!(s->state & PNG_ALLIMAGE))
                 goto fail;
@@ -583,44 +597,43 @@ static int decode_frame(AVCodecContext *avctx,
             goto exit_loop;
         default:
             /* skip tag */
-        skip_tag:
+skip_tag:
             bytestream2_skip(&s->gb, length + 4);
             break;
         }
     }
- exit_loop:
-     /* handle p-frames only if a predecessor frame is available */
-     if (s->prev->data[0]) {
-         if (!(avpkt->flags & AV_PKT_FLAG_KEY)) {
+exit_loop:
+    /* handle p-frames only if a predecessor frame is available */
+    if (s->prev->data[0]) {
+        if (!(avpkt->flags & AV_PKT_FLAG_KEY)) {
             int i, j;
             uint8_t *pd      = p->data[0];
             uint8_t *pd_last = s->prev->data[0];
 
             for (j = 0; j < s->height; j++) {
-                for (i = 0; i < s->width * s->bpp; i++) {
+                for (i = 0; i < s->width * s->bpp; i++)
                     pd[i] += pd_last[i];
-                }
                 pd      += s->image_linesize;
                 pd_last += s->image_linesize;
             }
         }
     }
 
-     av_frame_unref(s->prev);
-     if ((ret = av_frame_ref(s->prev, p)) < 0)
-         goto fail;
+    av_frame_unref(s->prev);
+    if ((ret = av_frame_ref(s->prev, p)) < 0)
+        goto fail;
 
     *got_frame = 1;
 
     ret = bytestream2_tell(&s->gb);
- the_end:
+the_end:
     inflateEnd(&s->zstream);
     av_free(crow_buf_base);
     s->crow_buf = NULL;
     av_freep(&s->last_row);
     av_freep(&s->tmp_row);
     return ret;
- fail:
+fail:
     ret = -1;
     goto the_end;
 }
diff --git a/libavcodec/pngdsp.c b/libavcodec/pngdsp.c
index 5cc41c4e80..c0e9402948 100644
--- a/libavcodec/pngdsp.c
+++ b/libavcodec/pngdsp.c
@@ -25,13 +25,13 @@
 #include "pngdsp.h"
 
 // 0x7f7f7f7f or 0x7f7f7f7f7f7f7f7f or whatever, depending on the cpu's native arithmetic size
-#define pb_7f (~0UL/255 * 0x7f)
-#define pb_80 (~0UL/255 * 0x80)
+#define pb_7f (~0UL / 255 * 0x7f)
+#define pb_80 (~0UL / 255 * 0x80)
 
 static void add_bytes_l2_c(uint8_t *dst, uint8_t *src1, uint8_t *src2, int w)
 {
     long i;
-    for (i = 0; i <= w - (int)sizeof(long); i += sizeof(long)) {
+    for (i = 0; i <= w - (int) sizeof(long); i += sizeof(long)) {
         long a = *(long *)(src1 + i);
         long b = *(long *)(src2 + i);
         *(long *)(dst + i) = ((a & pb_7f) + (b & pb_7f)) ^ ((a ^ b) & pb_80);
@@ -45,5 +45,6 @@ av_cold void ff_pngdsp_init(PNGDSPContext *dsp)
     dsp->add_bytes_l2         = add_bytes_l2_c;
     dsp->add_paeth_prediction = ff_add_png_paeth_prediction;
 
-    if (ARCH_X86) ff_pngdsp_init_x86(dsp);
+    if (ARCH_X86)
+        ff_pngdsp_init_x86(dsp);
 }
diff --git a/libavcodec/pngenc.c b/libavcodec/pngenc.c
index f58f7158a3..ccc5f7dada 100644
--- a/libavcodec/pngenc.c
+++ b/libavcodec/pngenc.c
@@ -18,6 +18,7 @@
  * License along with Libav; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
+
 #include "avcodec.h"
 #include "bytestream.h"
 #include "dsputil.h"
@@ -53,11 +54,11 @@ static void png_get_interlaced_row(uint8_t *dst, int row_size,
     const uint8_t *s;
 
     mask = ff_png_pass_mask[pass];
-    switch(bits_per_pixel) {
+    switch (bits_per_pixel) {
     case 1:
         memset(dst, 0, row_size);
         dst_x = 0;
-        for(x = 0; x < width; x++) {
+        for (x = 0; x < width; x++) {
             j = (x & 7);
             if ((mask << j) & 0x80) {
                 b = (src[x >> 3] >> (7 - j)) & 1;
@@ -70,7 +71,7 @@ static void png_get_interlaced_row(uint8_t *dst, int row_size,
         bpp = bits_per_pixel >> 3;
         d = dst;
         s = src;
-        for(x = 0; x < width; x++) {
+        for (x = 0; x < width; x++) {
             j = x & 7;
             if ((mask << j) & 0x80) {
                 memcpy(d, s, bpp);
@@ -82,17 +83,18 @@ static void png_get_interlaced_row(uint8_t *dst, int row_size,
     }
 }
 
-static void sub_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top, int w, int bpp)
+static void sub_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top,
+                                     int w, int bpp)
 {
     int i;
-    for(i = 0; i < w; i++) {
+    for (i = 0; i < w; i++) {
         int a, b, c, p, pa, pb, pc;
 
         a = src[i - bpp];
         b = top[i];
         c = top[i - bpp];
 
-        p = b - c;
+        p  = b - c;
         pc = a - c;
 
         pa = abs(p);
@@ -114,27 +116,27 @@ static void png_filter_row(DSPContext *dsp, uint8_t *dst, int filter_type,
 {
     int i;
 
-    switch(filter_type) {
+    switch (filter_type) {
     case PNG_FILTER_VALUE_NONE:
         memcpy(dst, src, size);
         break;
     case PNG_FILTER_VALUE_SUB:
-        dsp->diff_bytes(dst, src, src-bpp, size);
+        dsp->diff_bytes(dst, src, src - bpp, size);
         memcpy(dst, src, bpp);
         break;
     case PNG_FILTER_VALUE_UP:
         dsp->diff_bytes(dst, src, top, size);
         break;
     case PNG_FILTER_VALUE_AVG:
-        for(i = 0; i < bpp; i++)
+        for (i = 0; i < bpp; i++)
             dst[i] = src[i] - (top[i] >> 1);
-        for(; i < size; i++)
-            dst[i] = src[i] - ((src[i-bpp] + top[i]) >> 1);
+        for (; i < size; i++)
+            dst[i] = src[i] - ((src[i - bpp] + top[i]) >> 1);
         break;
     case PNG_FILTER_VALUE_PAETH:
-        for(i = 0; i < bpp; i++)
+        for (i = 0; i < bpp; i++)
             dst[i] = src[i] - top[i];
-        sub_png_paeth_prediction(dst+i, src+i, top+i, size-i, bpp);
+        sub_png_paeth_prediction(dst + i, src + i, top + i, size - i, bpp);
         break;
     }
 }
@@ -144,26 +146,26 @@ static uint8_t *png_choose_filter(PNGEncContext *s, uint8_t *dst,
 {
     int pred = s->filter_type;
     assert(bpp || !pred);
-    if(!top && pred)
+    if (!top && pred)
         pred = PNG_FILTER_VALUE_SUB;
-    if(pred == PNG_FILTER_VALUE_MIXED) {
+    if (pred == PNG_FILTER_VALUE_MIXED) {
         int i;
         int cost, bcost = INT_MAX;
         uint8_t *buf1 = dst, *buf2 = dst + size + 16;
-        for(pred=0; pred<5; pred++) {
-            png_filter_row(&s->dsp, buf1+1, pred, src, top, size, bpp);
+        for (pred = 0; pred < 5; pred++) {
+            png_filter_row(&s->dsp, buf1 + 1, pred, src, top, size, bpp);
             buf1[0] = pred;
             cost = 0;
-            for(i=0; i<=size; i++)
-                cost += abs((int8_t)buf1[i]);
-            if(cost < bcost) {
+            for (i = 0; i <= size; i++)
+                cost += abs((int8_t) buf1[i]);
+            if (cost < bcost) {
                 bcost = cost;
-                FFSWAP(uint8_t*, buf1, buf2);
+                FFSWAP(uint8_t *, buf1, buf2);
             }
         }
         return buf2;
     } else {
-        png_filter_row(&s->dsp, dst+1, pred, src, top, size, bpp);
+        png_filter_row(&s->dsp, dst + 1, pred, src, top, size, bpp);
         dst[0] = pred;
         return dst;
     }
@@ -176,13 +178,13 @@ static void convert_from_rgb32(uint8_t *dst, const uint8_t *src, int width)
     unsigned int v;
 
     d = dst;
-    for(j = 0; j < width; j++) {
-        v = ((const uint32_t *)src)[j];
+    for (j = 0; j < width; j++) {
+        v    = ((const uint32_t *) src)[j];
         d[0] = v >> 16;
         d[1] = v >> 8;
         d[2] = v;
         d[3] = v >> 24;
-        d += 4;
+        d   += 4;
     }
 }
 
@@ -211,16 +213,17 @@ static int png_write_row(PNGEncContext *s, const uint8_t *data, int size)
     int ret;
 
     s->zstream.avail_in = size;
-    s->zstream.next_in = (uint8_t *)data;
+    s->zstream.next_in  = (uint8_t *)data;
     while (s->zstream.avail_in > 0) {
         ret = deflate(&s->zstream, Z_NO_FLUSH);
         if (ret != Z_OK)
             return -1;
         if (s->zstream.avail_out == 0) {
-            if(s->bytestream_end - s->bytestream > IOBUF_SIZE + 100)
-                png_write_chunk(&s->bytestream, MKTAG('I', 'D', 'A', 'T'), s->buf, IOBUF_SIZE);
+            if (s->bytestream_end - s->bytestream > IOBUF_SIZE + 100)
+                png_write_chunk(&s->bytestream,
+                                MKTAG('I', 'D', 'A', 'T'), s->buf, IOBUF_SIZE);
             s->zstream.avail_out = IOBUF_SIZE;
-            s->zstream.next_out = s->buf;
+            s->zstream.next_out  = s->buf;
         }
     }
     return 0;
@@ -229,55 +232,55 @@ static int png_write_row(PNGEncContext *s, const uint8_t *data, int size)
 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                         const AVFrame *pict, int *got_packet)
 {
-    PNGEncContext *s = avctx->priv_data;
-    const AVFrame * const p = pict;
+    PNGEncContext *s       = avctx->priv_data;
+    const AVFrame *const p = pict;
     int bit_depth, color_type, y, len, row_size, ret, is_progressive;
     int bits_per_pixel, pass_row_size, enc_row_size, max_packet_size;
     int compression_level;
-    uint8_t *ptr, *top;
-    uint8_t *crow_base = NULL, *crow_buf, *crow;
+    uint8_t *ptr, *top, *crow_buf, *crow;
+    uint8_t *crow_base       = NULL;
     uint8_t *progressive_buf = NULL;
-    uint8_t *rgba_buf = NULL;
-    uint8_t *top_buf = NULL;
+    uint8_t *rgba_buf        = NULL;
+    uint8_t *top_buf         = NULL;
 
     is_progressive = !!(avctx->flags & CODEC_FLAG_INTERLACED_DCT);
-    switch(avctx->pix_fmt) {
+    switch (avctx->pix_fmt) {
     case AV_PIX_FMT_RGB32:
-        bit_depth = 8;
+        bit_depth  = 8;
         color_type = PNG_COLOR_TYPE_RGB_ALPHA;
         break;
     case AV_PIX_FMT_RGB24:
-        bit_depth = 8;
+        bit_depth  = 8;
         color_type = PNG_COLOR_TYPE_RGB;
         break;
     case AV_PIX_FMT_GRAY16BE:
-        bit_depth = 16;
+        bit_depth  = 16;
         color_type = PNG_COLOR_TYPE_GRAY;
         break;
     case AV_PIX_FMT_GRAY8:
-        bit_depth = 8;
+        bit_depth  = 8;
         color_type = PNG_COLOR_TYPE_GRAY;
         break;
     case AV_PIX_FMT_MONOBLACK:
-        bit_depth = 1;
+        bit_depth  = 1;
         color_type = PNG_COLOR_TYPE_GRAY;
         break;
     case AV_PIX_FMT_PAL8:
-        bit_depth = 8;
+        bit_depth  = 8;
         color_type = PNG_COLOR_TYPE_PALETTE;
         break;
     default:
         return -1;
     }
     bits_per_pixel = ff_png_get_nb_channels(color_type) * bit_depth;
-    row_size = (avctx->width * bits_per_pixel + 7) >> 3;
+    row_size       = (avctx->width * bits_per_pixel + 7) >> 3;
 
     s->zstream.zalloc = ff_png_zalloc;
-    s->zstream.zfree = ff_png_zfree;
+    s->zstream.zfree  = ff_png_zfree;
     s->zstream.opaque = NULL;
-    compression_level = avctx->compression_level == FF_COMPRESSION_DEFAULT ?
-                            Z_DEFAULT_COMPRESSION :
-                            av_clip(avctx->compression_level, 0, 9);
+    compression_level = avctx->compression_level == FF_COMPRESSION_DEFAULT
+                      ? Z_DEFAULT_COMPRESSION
+                      : av_clip(avctx->compression_level, 0, 9);
     ret = deflateInit2(&s->zstream, compression_level,
                        Z_DEFLATED, 15, 8, Z_DEFAULT_STRATEGY);
     if (ret != Z_OK)
@@ -301,7 +304,8 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
     crow_base = av_malloc((row_size + 32) << (s->filter_type == PNG_FILTER_VALUE_MIXED));
     if (!crow_base)
         goto fail;
-    crow_buf = crow_base + 15; // pixel data should be aligned, but there's a control byte before it
+    // pixel data should be aligned, but there's a control byte before it
+    crow_buf = crow_base + 15;
     if (is_progressive) {
         progressive_buf = av_malloc(row_size + 1);
         if (!progressive_buf)
@@ -324,8 +328,8 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
 
     AV_WB32(s->buf, avctx->width);
     AV_WB32(s->buf + 4, avctx->height);
-    s->buf[8] = bit_depth;
-    s->buf[9] = color_type;
+    s->buf[8]  = bit_depth;
+    s->buf[9]  = color_type;
     s->buf[10] = 0; /* compression type */
     s->buf[11] = 0; /* filter type */
     s->buf[12] = is_progressive; /* interlace type */
@@ -339,40 +343,42 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
         uint32_t *palette;
         uint8_t *alpha_ptr;
 
-        palette = (uint32_t *)p->data[1];
-        ptr = s->buf;
+        palette   = (uint32_t *)p->data[1];
+        ptr       = s->buf;
         alpha_ptr = s->buf + 256 * 3;
         has_alpha = 0;
-        for(i = 0; i < 256; i++) {
-            v = palette[i];
+        for (i = 0; i < 256; i++) {
+            v     = palette[i];
             alpha = v >> 24;
             if (alpha && alpha != 0xff)
                 has_alpha = 1;
             *alpha_ptr++ = alpha;
             bytestream_put_be24(&ptr, v);
         }
-        png_write_chunk(&s->bytestream, MKTAG('P', 'L', 'T', 'E'), s->buf, 256 * 3);
+        png_write_chunk(&s->bytestream,
+                        MKTAG('P', 'L', 'T', 'E'), s->buf, 256 * 3);
         if (has_alpha) {
-            png_write_chunk(&s->bytestream, MKTAG('t', 'R', 'N', 'S'), s->buf + 256 * 3, 256);
+            png_write_chunk(&s->bytestream,
+                            MKTAG('t', 'R', 'N', 'S'), s->buf + 256 * 3, 256);
         }
     }
 
     /* now put each row */
     s->zstream.avail_out = IOBUF_SIZE;
-    s->zstream.next_out = s->buf;
+    s->zstream.next_out  = s->buf;
     if (is_progressive) {
         int pass;
 
-        for(pass = 0; pass < NB_PASSES; pass++) {
+        for (pass = 0; pass < NB_PASSES; pass++) {
             /* NOTE: a pass is completely omitted if no pixels would be
-               output */
+             * output */
             pass_row_size = ff_png_pass_row_size(pass, bits_per_pixel, avctx->width);
             if (pass_row_size > 0) {
                 top = NULL;
-                for(y = 0; y < avctx->height; y++) {
+                for (y = 0; y < avctx->height; y++)
                     if ((ff_png_pass_ymask[pass] << (y & 7)) & 0x80) {
                         ptr = p->data[0] + y * p->linesize[0];
-                        FFSWAP(uint8_t*, progressive_buf, top_buf);
+                        FFSWAP(uint8_t *, progressive_buf, top_buf);
                         if (color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
                             convert_from_rgb32(rgba_buf, ptr, avctx->width);
                             ptr = rgba_buf;
@@ -380,29 +386,30 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                         png_get_interlaced_row(progressive_buf, pass_row_size,
                                                bits_per_pixel, pass,
                                                ptr, avctx->width);
-                        crow = png_choose_filter(s, crow_buf, progressive_buf, top, pass_row_size, bits_per_pixel>>3);
+                        crow = png_choose_filter(s, crow_buf, progressive_buf,
+                                                 top, pass_row_size, bits_per_pixel >> 3);
                         png_write_row(s, crow, pass_row_size + 1);
                         top = progressive_buf;
                     }
-                }
             }
         }
     } else {
         top = NULL;
-        for(y = 0; y < avctx->height; y++) {
+        for (y = 0; y < avctx->height; y++) {
             ptr = p->data[0] + y * p->linesize[0];
             if (color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
-                FFSWAP(uint8_t*, rgba_buf, top_buf);
+                FFSWAP(uint8_t *, rgba_buf, top_buf);
                 convert_from_rgb32(rgba_buf, ptr, avctx->width);
                 ptr = rgba_buf;
             }
-            crow = png_choose_filter(s, crow_buf, ptr, top, row_size, bits_per_pixel>>3);
+            crow = png_choose_filter(s, crow_buf, ptr, top,
+                                     row_size, bits_per_pixel >> 3);
             png_write_row(s, crow, row_size + 1);
             top = ptr;
         }
     }
     /* compress last bytes */
-    for(;;) {
+    for (;;) {
         ret = deflate(&s->zstream, Z_FINISH);
         if (ret == Z_OK || ret == Z_STREAM_END) {
             len = IOBUF_SIZE - s->zstream.avail_out;
@@ -410,7 +417,7 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                 png_write_chunk(&s->bytestream, MKTAG('I', 'D', 'A', 'T'), s->buf, len);
             }
             s->zstream.avail_out = IOBUF_SIZE;
-            s->zstream.next_out = s->buf;
+            s->zstream.next_out  = s->buf;
             if (ret == Z_STREAM_END)
                 break;
         } else {
@@ -424,19 +431,20 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
     *got_packet = 1;
     ret         = 0;
 
- the_end:
+the_end:
     av_free(crow_base);
     av_free(progressive_buf);
     av_free(rgba_buf);
     av_free(top_buf);
     deflateEnd(&s->zstream);
     return ret;
- fail:
+fail:
     ret = -1;
     goto the_end;
 }
 
-static av_cold int png_enc_init(AVCodecContext *avctx){
+static av_cold int png_enc_init(AVCodecContext *avctx)
+{
     PNGEncContext *s = avctx->priv_data;
 
     avctx->coded_frame = av_frame_alloc();
@@ -448,8 +456,10 @@ static av_cold int png_enc_init(AVCodecContext *avctx){
 
     ff_dsputil_init(&s->dsp, avctx);
 
-    s->filter_type = av_clip(avctx->prediction_method, PNG_FILTER_VALUE_NONE, PNG_FILTER_VALUE_MIXED);
-    if(avctx->pix_fmt == AV_PIX_FMT_MONOBLACK)
+    s->filter_type = av_clip(avctx->prediction_method,
+                             PNG_FILTER_VALUE_NONE,
+                             PNG_FILTER_VALUE_MIXED);
+    if (avctx->pix_fmt == AV_PIX_FMT_MONOBLACK)
         s->filter_type = PNG_FILTER_VALUE_NONE;
 
     return 0;
@@ -470,7 +480,7 @@ AVCodec ff_png_encoder = {
     .init           = png_enc_init,
     .close          = png_enc_close,
     .encode2        = encode_frame,
-    .pix_fmts       = (const enum AVPixelFormat[]){
+    .pix_fmts       = (const enum AVPixelFormat[]) {
         AV_PIX_FMT_RGB24, AV_PIX_FMT_RGB32, AV_PIX_FMT_PAL8, AV_PIX_FMT_GRAY8,
         AV_PIX_FMT_GRAY16BE,
         AV_PIX_FMT_MONOBLACK, AV_PIX_FMT_NONE