md5: cosmetics

[ffmpeg] / libavcodec / mpeg4video_parser.c

diff --git a/libavcodec/mpeg4video_parser.c b/libavcodec/mpeg4video_parser.c
index 4771ca0b443fef1897c63db50e80affc4513b730..2e498d100c621fd0489913d9ff55364b8445c24c 100644 (file)
--- a/libavcodec/mpeg4video_parser.c
+++ b/libavcodec/mpeg4video_parser.c
@@ -1,29 +1,68 @@
 /*
  * MPEG4 Video frame extraction
- * Copyright (c) 2003 Fabrice Bellard.
- * Copyright (c) 2003 Michael Niedermayer.
+ * Copyright (c) 2003 Fabrice Bellard
+ * Copyright (c) 2003 Michael Niedermayer
  *
- * This file is part of FFmpeg.
+ * This file is part of Libav.
  *
- * FFmpeg is free software; you can redistribute it and/or
+ * 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.
  *
- * FFmpeg is distributed in the hope that it will be useful,
+ * 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 FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "parser.h"
 #include "mpegvideo.h"
+#include "mpeg4video.h"
+#include "mpeg4video_parser.h"
 
 
+int ff_mpeg4_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){
+    int vop_found, i;
+    uint32_t state;
+
+    vop_found= pc->frame_start_found;
+    state= pc->state;
+
+    i=0;
+    if(!vop_found){
+        for(i=0; i<buf_size; i++){
+            state= (state<<8) | buf[i];
+            if(state == 0x1B6){
+                i++;
+                vop_found=1;
+                break;
+            }
+        }
+    }
+
+    if(vop_found){
+        /* EOF considered as end of frame */
+        if (buf_size == 0)
+            return 0;
+        for(; i<buf_size; i++){
+            state= (state<<8) | buf[i];
+            if((state&0xFFFFFF00) == 0x100){
+                pc->frame_start_found=0;
+                pc->state=-1;
+                return i-3;
+            }
+        }
+    }
+    pc->frame_start_found= vop_found;
+    pc->state= state;
+    return END_NOT_FOUND;
+}
+
 /* XXX: make it use less memory */
 static int av_mpeg4_decode_header(AVCodecParserContext *s1,
                                   AVCodecContext *avctx,
@@ -44,7 +83,7 @@ static int av_mpeg4_decode_header(AVCodecParserContext *s1,
 
     init_get_bits(gb, buf, 8 * buf_size);
     ret = ff_mpeg4_decode_picture_header(s, gb);
-    if (s->width) {
+    if (s->width && (!avctx->width || !avctx->height || !avctx->coded_width || !avctx->coded_height)) {
         avcodec_set_dimensions(avctx, s->width, s->height);
     }
     s1->pict_type= s->pict_type;
@@ -52,7 +91,7 @@ static int av_mpeg4_decode_header(AVCodecParserContext *s1,
     return ret;
 }
 
-static int mpeg4video_parse_init(AVCodecParserContext *s)
+static av_cold int mpeg4video_parse_init(AVCodecParserContext *s)
 {
     ParseContext1 *pc = s->priv_data;
 
@@ -90,7 +129,7 @@ static int mpeg4video_parse(AVCodecParserContext *s,
 }
 
 
-AVCodecParser mpeg4video_parser = {
+AVCodecParser ff_mpeg4video_parser = {
     { CODEC_ID_MPEG4 },
     sizeof(ParseContext1),
     mpeg4video_parse_init,