VP3 & Theora parser to extract keyframe flags.

This parser is not able to split random bitstream pieces.

Originally committed as revision 13986 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/Makefile

@@ -350,6 +350,7 @@ OBJS-$(CONFIG_MPEGAUDIO_PARSER)        += mpegaudio_parser.o mpegaudiodecheader.
 OBJS-$(CONFIG_MPEGVIDEO_PARSER)        += mpegvideo_parser.o mpeg12.o mpeg12data.o mpegvideo.o error_resilience.o
 OBJS-$(CONFIG_PNM_PARSER)              += pnm_parser.o pnm.o
 OBJS-$(CONFIG_VC1_PARSER)              += vc1_parser.o
+OBJS-$(CONFIG_VP3_PARSER)              += vp3_parser.o
 
 OBJS-$(CONFIG_DUMP_EXTRADATA_BSF)         += dump_extradata_bsf.o
 OBJS-$(CONFIG_H264_MP4TOANNEXB_BSF)       += h264_mp4toannexb_bsf.o

libavcodec/allcodecs.c

@@ -310,6 +310,7 @@ void avcodec_register_all(void)
     REGISTER_PARSER  (MPEGVIDEO, mpegvideo);
     REGISTER_PARSER  (PNM, pnm);
     REGISTER_PARSER  (VC1, vc1);
+    REGISTER_PARSER  (VP3, vp3);
 
     /* bitstream filters */
     REGISTER_BSF     (DUMP_EXTRADATA, dump_extradata);

libavcodec/vp3_parser.c

+/*
+ * Copyright (C) 2008 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"
+
+static int parse(AVCodecParserContext *s,
+                           AVCodecContext *avctx,
+                           const uint8_t **poutbuf, int *poutbuf_size,
+                           const uint8_t *buf, int buf_size)
+{
+    if(avctx->codec_id == CODEC_ID_THEORA)
+        s->pict_type= (buf[0]&0x40) ? FF_P_TYPE : FF_I_TYPE;
+    else
+        s->pict_type= (buf[0]&0x80) ? FF_P_TYPE : FF_I_TYPE;
+
+    *poutbuf = buf;
+    *poutbuf_size = buf_size;
+    return buf_size;
+}
+
+AVCodecParser vp3_parser = {
+    { CODEC_ID_THEORA, CODEC_ID_VP3 },
+    0,
+    NULL,
+    parse,
+};