split h264.c to move parser in its own file

Originally committed as revision 8985 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 149 insertions, 0 deletions

diff --git a/libavcodec/h264_parser.c b/libavcodec/h264_parser.c
new file mode 100644
index 0000000000..4adb6cbe22
--- /dev/null
+++ b/libavcodec/h264_parser.c
@@ -0,0 +1,149 @@
+/*
+ * H.26L/H.264/AVC/JVT/14496-10/... parser
+ * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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.
+ *
+ * FFmpeg 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ */
+
+/**
+ * @file h264_parser.c
+ * H.264 / AVC / MPEG4 part10 parser.
+ * @author Michael Niedermayer <michaelni@gmx.at>
+ */
+
+#include "parser.h"
+#include "h264_parser.h"
+
+#include <assert.h>
+
+
+int ff_h264_find_frame_end(H264Context *h, const uint8_t *buf, int buf_size)
+{
+    int i;
+    uint32_t state;
+    ParseContext *pc = &(h->s.parse_context);
+//printf("first %02X%02X%02X%02X\n", buf[0], buf[1],buf[2],buf[3]);
+//    mb_addr= pc->mb_addr - 1;
+    state= pc->state;
+    if(state>13)
+        state= 7;
+
+    for(i=0; i<buf_size; i++){
+        if(state==7){
+            for(; i<buf_size; i++){
+                if(!buf[i]){
+                    state=2;
+                    break;
+                }
+            }
+        }else if(state<=2){
+            if(buf[i]==1)   state^= 5; //2->7, 1->4, 0->5
+            else if(buf[i]) state = 7;
+            else            state>>=1; //2->1, 1->0, 0->0
+        }else if(state<=5){
+            int v= buf[i] & 0x1F;
+            if(v==7 || v==8 || v==9){
+                if(pc->frame_start_found){
+                    i++;
+found:
+                    pc->state=7;
+                    pc->frame_start_found= 0;
+                    return i-(state&5);
+                }
+            }else if(v==1 || v==2 || v==5){
+                if(pc->frame_start_found){
+                    state+=8;
+                    continue;
+                }else
+                    pc->frame_start_found = 1;
+            }
+            state= 7;
+        }else{
+            if(buf[i] & 0x80)
+                goto found;
+            state= 7;
+        }
+    }
+    pc->state= state;
+    return END_NOT_FOUND;
+}
+
+static int h264_parse(AVCodecParserContext *s,
+                      AVCodecContext *avctx,
+                      const uint8_t **poutbuf, int *poutbuf_size,
+                      const uint8_t *buf, int buf_size)
+{
+    H264Context *h = s->priv_data;
+    ParseContext *pc = &h->s.parse_context;
+    int next;
+
+    if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
+        next= buf_size;
+    }else{
+        next= ff_h264_find_frame_end(h, buf, buf_size);
+
+        if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
+            *poutbuf = NULL;
+            *poutbuf_size = 0;
+            return buf_size;
+        }
+
+        if(next<0 && next != END_NOT_FOUND){
+            assert(pc->last_index + next >= 0 );
+            ff_h264_find_frame_end(h, &pc->buffer[pc->last_index + next], -next); //update state
+        }
+    }
+
+    *poutbuf = buf;
+    *poutbuf_size = buf_size;
+    return next;
+}
+
+static int h264_split(AVCodecContext *avctx,
+                      const uint8_t *buf, int buf_size)
+{
+    int i;
+    uint32_t state = -1;
+    int has_sps= 0;
+
+    for(i=0; i<=buf_size; i++){
+        if((state&0xFFFFFF1F) == 0x107)
+            has_sps=1;
+/*        if((state&0xFFFFFF1F) == 0x101 || (state&0xFFFFFF1F) == 0x102 || (state&0xFFFFFF1F) == 0x105){
+        }*/
+        if((state&0xFFFFFF00) == 0x100 && (state&0xFFFFFF1F) != 0x107 && (state&0xFFFFFF1F) != 0x108 && (state&0xFFFFFF1F) != 0x109){
+            if(has_sps){
+                while(i>4 && buf[i-5]==0) i--;
+                return i-4;
+            }
+        }
+        if (i<buf_size)
+            state= (state<<8) | buf[i];
+    }
+    return 0;
+}
+
+
+AVCodecParser h264_parser = {
+    { CODEC_ID_H264 },
+    sizeof(H264Context),
+    NULL,
+    h264_parse,
+    ff_parse_close,
+    h264_split,
+};