gif: K&R formatting cosmetics

Signed-off-by: Diego Biurrun <diego@biurrun.de>

libavformat/gif.c

@@ -53,7 +53,9 @@
 #define GIF_CHUNKS 100
 
 /* slows down the decoding (and some browsers don't like it) */
-/* update on the 'some browsers don't like it issue from above: this was probably due to missing 'Data Sub-block Terminator' (byte 19) in the app_header */
+/* update on the 'some browsers don't like it issue from above:
+ * this was probably due to missing 'Data Sub-block Terminator'
+ * (byte 19) in the app_header */
 #define GIF_ADD_APP_HEADER // required to enable looping of animated gif
 
 typedef struct {
@@ -65,8 +67,15 @@ typedef struct {
 /* we use the standard 216 color palette */
 
 /* this script was used to create the palette:
- * for r in 00 33 66 99 cc ff; do for g in 00 33 66 99 cc ff; do echo -n "    "; for b in 00 33 66 99 cc ff; do
- *   echo -n "{ 0x$r, 0x$g, 0x$b }, "; done; echo ""; done; done
+ * for r in 00 33 66 99 cc ff; do
+ *     for g in 00 33 66 99 cc ff; do
+ *         echo -n "    "
+ *         for b in 00 33 66 99 cc ff; do
+ *             echo -n "{ 0x$r, 0x$g, 0x$b }, "
+ *         done
+ *         echo ""
+ *     done
+ * done
  */
 
 static const rgb_triplet gif_clut[216] = {
@@ -109,9 +118,8 @@ static const rgb_triplet gif_clut[216] = {
 };
 
 /* GIF header */
-static int gif_image_write_header(AVIOContext *pb,
-                                  int width, int height, int loop_count,
-                                  uint32_t *palette)
+static int gif_image_write_header(AVIOContext *pb, int width, int height,
+                                  int loop_count, uint32_t *palette)
 {
     int i;
     unsigned int v;
@@ -127,44 +135,45 @@ static int gif_image_write_header(AVIOContext *pb,
 
     /* the global palette */
     if (!palette) {
-        avio_write(pb, (const unsigned char *)gif_clut, 216*3);
-        for(i=0;i<((256-216)*3);i++)
+        avio_write(pb, (const unsigned char *)gif_clut, 216 * 3);
+        for (i = 0; i < ((256 - 216) * 3); i++)
             avio_w8(pb, 0);
     } else {
-        for(i=0;i<256;i++) {
+        for (i = 0; i < 256; i++) {
             v = palette[i];
             avio_w8(pb, (v >> 16) & 0xff);
-            avio_w8(pb, (v >> 8) & 0xff);
-            avio_w8(pb, (v) & 0xff);
+            avio_w8(pb, (v >>  8) & 0xff);
+            avio_w8(pb, (v)       & 0xff);
         }
     }
 
-        /*        update: this is the 'NETSCAPE EXTENSION' that allows for looped animated gif
-                see http://members.aol.com/royalef/gifabout.htm#net-extension
-
-                byte   1       : 33 (hex 0x21) GIF Extension code
-                byte   2       : 255 (hex 0xFF) Application Extension Label
-                byte   3       : 11 (hex (0x0B) Length of Application Block
-                                         (eleven bytes of data to follow)
-                bytes  4 to 11 : "NETSCAPE"
-                bytes 12 to 14 : "2.0"
-                byte  15       : 3 (hex 0x03) Length of Data Sub-Block
-                                         (three bytes of data to follow)
-                byte  16       : 1 (hex 0x01)
-                bytes 17 to 18 : 0 to 65535, an unsigned integer in
-                                         lo-hi byte format. This indicate the
-                                         number of iterations the loop should
-                                         be executed.
-                bytes 19       : 0 (hex 0x00) a Data Sub-block Terminator
-        */
+    /* update: this is the 'NETSCAPE EXTENSION' that allows for looped animated
+     * GIF, see http://members.aol.com/royalef/gifabout.htm#net-extension
+     *
+     * byte   1       : 33 (hex 0x21) GIF Extension code
+     * byte   2       : 255 (hex 0xFF) Application Extension Label
+     * byte   3       : 11 (hex (0x0B) Length of Application Block
+     *                          (eleven bytes of data to follow)
+     * bytes  4 to 11 : "NETSCAPE"
+     * bytes 12 to 14 : "2.0"
+     * byte  15       : 3 (hex 0x03) Length of Data Sub-Block
+     *                          (three bytes of data to follow)
+     * byte  16       : 1 (hex 0x01)
+     * bytes 17 to 18 : 0 to 65535, an unsigned integer in
+     *                          lo-hi byte format. This indicate the
+     *                          number of iterations the loop should
+     *                          be executed.
+     * bytes 19       : 0 (hex 0x00) a Data Sub-block Terminator
+     */
 
     /* application extension header */
 #ifdef GIF_ADD_APP_HEADER
     if (loop_count >= 0 && loop_count <= 65535) {
-    avio_w8(pb, 0x21);
-    avio_w8(pb, 0xff);
-    avio_w8(pb, 0x0b);
-        avio_write(pb, "NETSCAPE2.0", sizeof("NETSCAPE2.0") - 1);  // bytes 4 to 14
+        avio_w8(pb, 0x21);
+        avio_w8(pb, 0xff);
+        avio_w8(pb, 0x0b);
+        // bytes 4 to 14
+        avio_write(pb, "NETSCAPE2.0", sizeof("NETSCAPE2.0") - 1);
         avio_w8(pb, 0x03); // byte 15
         avio_w8(pb, 0x01); // byte 16
         avio_wl16(pb, (uint16_t)loop_count);
@@ -180,7 +189,6 @@ static inline unsigned char gif_clut_index(uint8_t r, uint8_t g, uint8_t b)
     return (((r) / 47) % 6) * 6 * 6 + (((g) / 47) % 6) * 6 + (((b) / 47) % 6);
 }
 
-
 static int gif_image_write_image(AVIOContext *pb,
                                  int x1, int y1, int width, int height,
                                  const uint8_t *buf, int linesize, int pix_fmt)
@@ -201,45 +209,44 @@ static int gif_image_write_image(AVIOContext *pb,
 
     avio_w8(pb, 0x08);
 
-    left= width * height;
+    left = width * height;
 
     init_put_bits(&p, buffer, 130);
 
 /*
- * the thing here is the bitstream is written as little packets, with a size byte before
- * but it's still the same bitstream between packets (no flush !)
+ * the thing here is the bitstream is written as little packets, with a size
+ * byte before but it's still the same bitstream between packets (no flush !)
  */
     ptr = buf;
-    w = width;
-    while(left>0) {
-
+    w   = width;
+    while (left > 0) {
         put_bits(&p, 9, 0x0100); /* clear code */
 
-        for(i=(left<GIF_CHUNKS)?left:GIF_CHUNKS;i;i--) {
+        for (i = (left < GIF_CHUNKS) ? left : GIF_CHUNKS; i; i--) {
             if (pix_fmt == PIX_FMT_RGB24) {
-                v = gif_clut_index(ptr[0], ptr[1], ptr[2]);
-                ptr+=3;
+                v    = gif_clut_index(ptr[0], ptr[1], ptr[2]);
+                ptr += 3;
             } else {
                 v = *ptr++;
             }
             put_bits(&p, 9, v);
             if (--w == 0) {
-                w = width;
+                w    = width;
                 buf += linesize;
-                ptr = buf;
+                ptr  = buf;
             }
         }
 
-        if(left<=GIF_CHUNKS) {
+        if (left <= GIF_CHUNKS) {
             put_bits(&p, 9, 0x101); /* end of stream */
             flush_put_bits(&p);
         }
-        if(put_bits_ptr(&p) - p.buf > 0) {
+        if (put_bits_ptr(&p) - p.buf > 0) {
             avio_w8(pb, put_bits_ptr(&p) - p.buf); /* byte count of the packet */
             avio_write(pb, p.buf, put_bits_ptr(&p) - p.buf); /* the actual buffer */
             p.buf_ptr = p.buf; /* dequeue the bytes off the bitstream */
         }
-        left-=GIF_CHUNKS;
+        left -= GIF_CHUNKS;
     }
     avio_w8(pb, 0x00); /* end of image block */
 
@@ -261,14 +268,14 @@ static int gif_write_header(AVFormatContext *s)
     int i, width, height /*, rate*/;
 
 /* XXX: do we reject audio streams or just ignore them ?
-    if(s->nb_streams > 1)
-        return -1;
-*/
-    gif->time = 0;
+ *  if (s->nb_streams > 1)
+ *      return -1;
+ */
+    gif->time      = 0;
     gif->file_time = 0;
 
     video_enc = NULL;
-    for(i=0;i<s->nb_streams;i++) {
+    for (i = 0; i < s->nb_streams; i++) {
         enc = s->streams[i]->codec;
         if (enc->codec_type != AVMEDIA_TYPE_AUDIO)
             video_enc = enc;
@@ -278,13 +285,14 @@ static int gif_write_header(AVFormatContext *s)
         av_free(gif);
         return -1;
     } else {
-        width = video_enc->width;
+        width  = video_enc->width;
         height = video_enc->height;
 //        rate = video_enc->time_base.den;
     }
 
     if (video_enc->pix_fmt != PIX_FMT_RGB24) {
-        av_log(s, AV_LOG_ERROR, "ERROR: gif only handles the rgb24 pixel format. Use -pix_fmt rgb24.\n");
+        av_log(s, AV_LOG_ERROR,
+               "ERROR: gif only handles the rgb24 pixel format. Use -pix_fmt rgb24.\n");
         return AVERROR(EIO);
     }
 
@@ -294,8 +302,8 @@ static int gif_write_header(AVFormatContext *s)
     return 0;
 }
 
-static int gif_write_video(AVFormatContext *s,
-                           AVCodecContext *enc, const uint8_t *buf, int size)
+static int gif_write_video(AVFormatContext *s, AVCodecContext *enc,
+                           const uint8_t *buf, int size)
 {
     AVIOContext *pb = s->pb;
     int jiffies;
@@ -311,7 +319,7 @@ static int gif_write_video(AVFormatContext *s,
     /* XXX: should use delay, in order to be more accurate */
     /* instead of using the same rounded value each time */
     /* XXX: don't even remember if I really use it for now */
-    jiffies = (70*enc->time_base.num/enc->time_base.den) - 1;
+    jiffies = (70 * enc->time_base.num / enc->time_base.den) - 1;
 
     avio_wl16(pb, jiffies);
 
@@ -346,7 +354,8 @@ static int gif_write_trailer(AVFormatContext *s)
 #define OFFSET(x) offsetof(GIFContext, x)
 #define ENC AV_OPT_FLAG_ENCODING_PARAM
 static const AVOption options[] = {
-    { "loop", "Number of times to loop the output.", OFFSET(loop), AV_OPT_TYPE_INT, {0}, 0, 65535, ENC },
+    { "loop", "Number of times to loop the output.", OFFSET(loop),
+      AV_OPT_TYPE_INT, { 0 }, 0, 65535, ENC },
     { NULL },
 };
 
@@ -358,15 +367,15 @@ static const AVClass gif_muxer_class = {
 };
 
 AVOutputFormat ff_gif_muxer = {
-    .name              = "gif",
-    .long_name         = NULL_IF_CONFIG_SMALL("GIF Animation"),
-    .mime_type         = "image/gif",
-    .extensions        = "gif",
-    .priv_data_size    = sizeof(GIFContext),
-    .audio_codec       = CODEC_ID_NONE,
-    .video_codec       = CODEC_ID_RAWVIDEO,
-    .write_header      = gif_write_header,
-    .write_packet      = gif_write_packet,
-    .write_trailer     = gif_write_trailer,
-    .priv_class = &gif_muxer_class,
+    .name           = "gif",
+    .long_name      = NULL_IF_CONFIG_SMALL("GIF Animation"),
+    .mime_type      = "image/gif",
+    .extensions     = "gif",
+    .priv_data_size = sizeof(GIFContext),
+    .audio_codec    = CODEC_ID_NONE,
+    .video_codec    = CODEC_ID_RAWVIDEO,
+    .write_header   = gif_write_header,
+    .write_packet   = gif_write_packet,
+    .write_trailer  = gif_write_trailer,
+    .priv_class     = &gif_muxer_class,
 };