X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fh264dsp.c;h=a901dbb9e1da4555db33757d8934627fb34ab3d6;hb=2df7f7714a12a59d31058aba15fb1e348e36b0ab;hp=6ba465bced6ec89719e7dcc518e8cd2170095c6f;hpb=38282149b6ce8f4b8361e3b84542ba9aa8a1f32f;p=ffmpeg

diff --git a/libavcodec/h264dsp.c b/libavcodec/h264dsp.c
index 6ba465bced6..a901dbb9e1d 100644
--- a/libavcodec/h264dsp.c
+++ b/libavcodec/h264dsp.c
@@ -26,6 +26,8 @@
  */
 
 #include <stdint.h>
+
+#include "libavutil/attributes.h"
 #include "avcodec.h"
 #include "h264dsp.h"
 #include "h264idct.h"
@@ -51,7 +53,36 @@
 #include "h264addpx_template.c"
 #undef BIT_DEPTH
 
-void ff_h264dsp_init(H264DSPContext *c, const int bit_depth, const int chroma_format_idc)
+static int h264_find_start_code_candidate_c(const uint8_t *buf, int size)
+{
+    int i = 0;
+#if HAVE_FAST_UNALIGNED
+    /* we check i < size instead of i + 3 / 7 because it is
+     * simpler and there must be FF_INPUT_BUFFER_PADDING_SIZE
+     * bytes at the end.
+     */
+#if HAVE_FAST_64BIT
+    while (i < size &&
+            !((~*(const uint64_t *)(buf + i) &
+                    (*(const uint64_t *)(buf + i) - 0x0101010101010101ULL)) &
+                    0x8080808080808080ULL))
+        i += 8;
+#else
+    while (i < size &&
+            !((~*(const uint32_t *)(buf + i) &
+                    (*(const uint32_t *)(buf + i) - 0x01010101U)) &
+                    0x80808080U))
+        i += 4;
+#endif
+#endif
+    for (; i < size; i++)
+        if (!buf[i])
+            break;
+    return i;
+}
+
+av_cold void ff_h264dsp_init(H264DSPContext *c, const int bit_depth,
+                             const int chroma_format_idc)
 {
 #undef FUNC
 #define FUNC(a, depth) a ## _ ## depth ## _c
@@ -130,6 +161,7 @@ void ff_h264dsp_init(H264DSPContext *c, const int bit_depth, const int chroma_fo
         H264_DSP(8);
         break;
     }
+    c->h264_find_start_code_candidate = h264_find_start_code_candidate_c;
 
     if (ARCH_ARM) ff_h264dsp_init_arm(c, bit_depth, chroma_format_idc);
     if (ARCH_PPC) ff_h264dsp_init_ppc(c, bit_depth, chroma_format_idc);