1 files changed, 138 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavcodec/mpeg4video_parser.c b/contrib/ffmpeg/libavcodec/mpeg4video_parser.c
new file mode 100644
index 000000000..9accc9126
--- /dev/null
+++ b/contrib/ffmpeg/libavcodec/mpeg4video_parser.c
@@ -0,0 +1,138 @@
+/*
+ * MPEG4 Video frame extraction
+ * Copyright (c) 2003 Fabrice Bellard.
+ * Copyright (c) 2003 Michael Niedermayer.
+ *
+ * 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
+ */
+
+#include "parser.h"
+#include "mpegvideo.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,
+                                  const uint8_t *buf, int buf_size)
+{
+    ParseContext1 *pc = s1->priv_data;
+    MpegEncContext *s = pc->enc;
+    GetBitContext gb1, *gb = &gb1;
+    int ret;
+
+    s->avctx = avctx;
+    s->current_picture_ptr = &s->current_picture;
+
+    if (avctx->extradata_size && pc->first_picture){
+        init_get_bits(gb, avctx->extradata, avctx->extradata_size*8);
+        ret = ff_mpeg4_decode_picture_header(s, gb);
+    }
+
+    init_get_bits(gb, buf, 8 * buf_size);
+    ret = ff_mpeg4_decode_picture_header(s, gb);
+    if (s->width) {
+        avcodec_set_dimensions(avctx, s->width, s->height);
+    }
+    s1->pict_type= s->pict_type;
+    pc->first_picture = 0;
+    return ret;
+}
+
+static int mpeg4video_parse_init(AVCodecParserContext *s)
+{
+    ParseContext1 *pc = s->priv_data;
+
+    pc->enc = av_mallocz(sizeof(MpegEncContext));
+    if (!pc->enc)
+        return -1;
+    pc->first_picture = 1;
+    return 0;
+}
+
+static int mpeg4video_parse(AVCodecParserContext *s,
+                           AVCodecContext *avctx,
+                           const uint8_t **poutbuf, int *poutbuf_size,
+                           const uint8_t *buf, int buf_size)
+{
+    ParseContext *pc = s->priv_data;
+    int next;
+
+    if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
+        next= buf_size;
+    }else{
+        next= ff_mpeg4_find_frame_end(pc, buf, buf_size);
+
+        if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
+            *poutbuf = NULL;
+            *poutbuf_size = 0;
+            return buf_size;
+        }
+    }
+    av_mpeg4_decode_header(s, avctx, buf, buf_size);
+
+    *poutbuf = buf;
+    *poutbuf_size = buf_size;
+    return next;
+}
+
+
+AVCodecParser mpeg4video_parser = {
+    { CODEC_ID_MPEG4 },
+    sizeof(ParseContext1),
+    mpeg4video_parse_init,
+    mpeg4video_parse,
+    ff_parse1_close,
+    ff_mpeg4video_split,
+};