h264: Move start code search functions into separate source files.

This permits re-use with parsers for codecs which use similar start codes.

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

configure

@@ -1578,6 +1578,7 @@ CONFIG_EXTRA="
     rtpdec
     rtpenc_chain
     sinewin
+    startcode
     tpeldsp
     videodsp
     vp3dsp
@@ -1794,7 +1795,7 @@ h263_decoder_select="error_resilience h263_parser h263dsp mpeg_er mpegvideo qpel
 h263_encoder_select="aandcttables h263dsp mpegvideoenc"
 h263i_decoder_select="h263_decoder"
 h263p_encoder_select="h263_encoder"
-h264_decoder_select="cabac golomb h264chroma h264dsp h264pred h264qpel videodsp"
+h264_decoder_select="cabac golomb h264chroma h264dsp h264pred h264qpel startcode videodsp"
 h264_decoder_suggest="error_resilience"
 hevc_decoder_select="bswapdsp cabac golomb videodsp"
 huffyuv_decoder_select="bswapdsp huffyuvdsp"

libavcodec/Makefile

@@ -79,6 +79,7 @@ OBJS-$(CONFIG_RANGECODER)              += rangecoder.o
 RDFT-OBJS-$(CONFIG_HARDCODED_TABLES)   += sin_tables.o
 OBJS-$(CONFIG_RDFT)                    += rdft.o $(RDFT-OBJS-yes)
 OBJS-$(CONFIG_SINEWIN)                 += sinewin.o
+OBJS-$(CONFIG_STARTCODE)               += startcode.o
 OBJS-$(CONFIG_TPELDSP)                 += tpeldsp.o
 OBJS-$(CONFIG_VAAPI)                   += vaapi.o
 OBJS-$(CONFIG_VDA)                     += vda.o

libavcodec/arm/Makefile

@@ -53,7 +53,6 @@ ARMV5TE-OBJS-$(CONFIG_VIDEODSP)        += arm/videodsp_init_armv5te.o   \
 ARMV5TE-OBJS-$(CONFIG_MLP_DECODER)     += arm/mlpdsp_armv5te.o
 
 ARMV6-OBJS-$(CONFIG_AC3DSP)            += arm/ac3dsp_armv6.o
-ARMV6-OBJS-$(CONFIG_H264DSP)           += arm/h264dsp_armv6.o
 ARMV6-OBJS-$(CONFIG_HPELDSP)           += arm/hpeldsp_init_armv6.o      \
                                           arm/hpeldsp_armv6.o
 ARMV6-OBJS-$(CONFIG_IDCTDSP)           += arm/idctdsp_init_armv6.o      \
@@ -65,6 +64,7 @@ ARMV6-OBJS-$(CONFIG_MPEGVIDEOENC)      += arm/mpegvideoencdsp_armv6.o
 ARMV6-OBJS-$(CONFIG_PIXBLOCKDSP)       += arm/pixblockdsp_armv6.o
 
 ARMV6-OBJS-$(CONFIG_MLP_DECODER)       += arm/mlpdsp_armv6.o
+ARMV6-OBJS-$(CONFIG_STARTCODE)         += arm/startcode_armv6.o
 ARMV6-OBJS-$(CONFIG_VP7_DECODER)       += arm/vp8_armv6.o               \
                                           arm/vp8dsp_init_armv6.o       \
                                           arm/vp8dsp_armv6.o

libavcodec/arm/h264dsp_init_arm.c

@@ -23,8 +23,7 @@
 #include "libavutil/attributes.h"
 #include "libavutil/arm/cpu.h"
 #include "libavcodec/h264dsp.h"
-
-int ff_h264_find_start_code_candidate_armv6(const uint8_t *buf, int size);
+#include "libavcodec/arm/startcode.h"
 
 void ff_h264_v_loop_filter_luma_neon(uint8_t *pix, int stride, int alpha,
                                      int beta, int8_t *tc0);
@@ -105,7 +104,7 @@ av_cold void ff_h264dsp_init_arm(H264DSPContext *c, const int bit_depth,
     int cpu_flags = av_get_cpu_flags();
 
     if (have_setend(cpu_flags))
-        c->h264_find_start_code_candidate = ff_h264_find_start_code_candidate_armv6;
+        c->startcode_find_candidate = ff_startcode_find_candidate_armv6;
     if (have_neon(cpu_flags))
         h264dsp_init_neon(c, bit_depth, chroma_format_idc);
 }

libavcodec/arm/startcode.h

@@ -0,0 +1,26 @@
+/*
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVCODEC_ARM_STARTCODE_H
+#define AVCODEC_ARM_STARTCODE_H
+
+#include <stdint.h>
+
+int ff_startcode_find_candidate_armv6(const uint8_t *buf, int size);
+
+#endif /* AVCODEC_ARM_STARTCODE_H */

libavcodec/arm/h264dsp_armv6.S → libavcodec/arm/startcode_armv6.S

@@ -69,8 +69,8 @@ TMP3    .req    lr
         andseq  TMP3, TMP3, PATTERN
 .endm
 
-/* int ff_h264_find_start_code_candidate_armv6(const uint8_t *buf, int size) */
-function ff_h264_find_start_code_candidate_armv6, export=1
+/* int ff_startcode_find_candidate_armv6(const uint8_t *buf, int size) */
+function ff_startcode_find_candidate_armv6, export=1
         push    {v1-v6,lr}
         mov     PTR, BUF
         @ Ensure there are at least (PRELOAD_DISTANCE+2) complete cachelines to go

libavcodec/h264_parser.c

@@ -48,7 +48,7 @@ static int h264_find_frame_end(H264Context *h, const uint8_t *buf,
 
     for (i = 0; i < buf_size; i++) {
         if (state == 7) {
-            i += h->h264dsp.h264_find_start_code_candidate(buf + i, buf_size - i);
+            i += h->h264dsp.startcode_find_candidate(buf + i, buf_size - i);
             if (i < buf_size)
                 state = 2;
         } else if (state <= 2) {

libavcodec/h264dsp.c

@@ -31,6 +31,7 @@
 #include "avcodec.h"
 #include "h264dsp.h"
 #include "h264idct.h"
+#include "startcode.h"
 #include "libavutil/common.h"
 
 #define BIT_DEPTH 8
@@ -53,34 +54,6 @@
 #include "h264addpx_template.c"
 #undef BIT_DEPTH
 
-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)
 {
@@ -161,7 +134,7 @@ av_cold void ff_h264dsp_init(H264DSPContext *c, const int bit_depth,
         H264_DSP(8);
         break;
     }
-    c->h264_find_start_code_candidate = h264_find_start_code_candidate_c;
+    c->startcode_find_candidate = ff_startcode_find_candidate_c;
 
     if (ARCH_AARCH64) ff_h264dsp_init_aarch64(c, bit_depth, chroma_format_idc);
     if (ARCH_ARM) ff_h264dsp_init_arm(c, bit_depth, chroma_format_idc);

libavcodec/h264dsp.h

@@ -113,7 +113,7 @@ typedef struct H264DSPContext {
      * one or more further zero bytes and a one byte. Better still, filter
      * out any bytes that form the trailing_zero_8bits syntax element too.
      */
-    int (*h264_find_start_code_candidate)(const uint8_t *buf, int size);
+    int (*startcode_find_candidate)(const uint8_t *buf, int size);
 } H264DSPContext;
 
 void ff_h264dsp_init(H264DSPContext *c, const int bit_depth,

libavcodec/startcode.c

@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2003-2010 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * Accelerated start code search function for start codes common to
+ * MPEG-1/2/4 video, VC-1, H.264/5
+ * @author Michael Niedermayer <michaelni@gmx.at>
+ */
+
+#include "startcode.h"
+#include "config.h"
+
+int ff_startcode_find_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;
+}

libavcodec/startcode.h

@@ -0,0 +1,26 @@
+/*
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVCODEC_STARTCODE_H
+#define AVCODEC_STARTCODE_H
+
+#include <stdint.h>
+
+int ff_startcode_find_candidate_c(const uint8_t *buf, int size);
+
+#endif /* AVCODEC_STARTCODE_H */