updating nut demuxer to latest spec

no muxing yet
no index yet
no seeking yet
libnuts crcs dont match mine (didnt investigate yet)
samplerate is stored wrong by libnut (demuxer has a workaround)
code is not clean or beautifull yet, but i thought its better to commit early before someone unneccesarily wastes his time duplicating the work
demuxer split from muxer

Originally committed as revision 6966 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/Makefile

@@ -73,8 +73,8 @@ OBJS-$(CONFIG_MPEGTS_MUXER)              += mpegtsenc.o
 OBJS-$(CONFIG_MPJPEG_MUXER)              += mpjpeg.o
 OBJS-$(CONFIG_MXF_DEMUXER)               += mxf.o
 OBJS-$(CONFIG_NSV_DEMUXER)               += nsvdec.o riff.o
-OBJS-$(CONFIG_NUT_DEMUXER)               += nut.o riff.o
-OBJS-$(CONFIG_NUT_MUXER)                 += nut.o riff.o
+OBJS-$(CONFIG_NUT_DEMUXER)               += nutdec.o riff.o
+#OBJS-$(CONFIG_NUT_MUXER)                 += nutenc.o riff.o
 OBJS-$(CONFIG_NUV_DEMUXER)               += nuv.o riff.o
 OBJS-$(CONFIG_OGG_DEMUXER)               += ogg2.o           \
                                             oggparsevorbis.o \

libavformat/allformats.c

@@ -249,7 +249,7 @@ void av_register_all(void)
     av_register_input_format(&nut_demuxer);
 #endif
 #ifdef CONFIG_NUT_MUXER
-    av_register_output_format(&nut_muxer);
+//    av_register_output_format(&nut_muxer);
 #endif
 #ifdef CONFIG_NUV_DEMUXER
     av_register_input_format(&nuv_demuxer);

libavformat/nut.h

+/*
+ * "NUT" Container Format (de)muxer
+ * Copyright (c) 2006 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 <limits.h>
+#include "avformat.h"
+#include "crc.h"
+//#include "mpegaudio.h"
+#include "riff.h"
+//#include "adler32.h"
+
+#define      MAIN_STARTCODE (0x7A561F5F04ADULL + (((uint64_t)('N'<<8) + 'M')<<48))
+#define    STREAM_STARTCODE (0x11405BF2F9DBULL + (((uint64_t)('N'<<8) + 'S')<<48))
+#define SYNCPOINT_STARTCODE (0xE4ADEECA4569ULL + (((uint64_t)('N'<<8) + 'K')<<48))
+#define     INDEX_STARTCODE (0xDD672F23E64EULL + (((uint64_t)('N'<<8) + 'X')<<48))
+#define      INFO_STARTCODE (0xAB68B596BA78ULL + (((uint64_t)('N'<<8) + 'I')<<48))
+
+#define ID_STRING "nut/multimedia container\0"
+
+#define MAX_DISTANCE (1024*32-1)
+
+typedef enum{
+    FLAG_KEY        =   1, ///<if set, frame is keyframe
+    FLAG_EOR        =   2, ///<if set, stream has no relevance on presentation. (EOR)
+    FLAG_CODED_PTS  =   8, ///<if set, coded_pts is in the frame header
+    FLAG_STREAM_ID  =  16, ///<if set, stream_id is coded in the frame header
+    FLAG_SIZE_MSB   =  32, ///<if set, data_size_msb is at frame header, otherwise data_size_msb is 0
+    FLAG_CHECKSUM   =  64, ///<if set then the frame header contains a checksum
+    FLAG_RESERVED   = 128, ///<if set, reserved_count is coded in the frame header
+    FLAG_CODED      =4096, ///<if set, coded_flags are stored in the frame header.
+    FLAG_INVALID    =8192, ///<if set, frame_code is invalid.
+}flag_t;
+
+typedef struct {
+    uint32_t pos; //64gb limit if div16 (change this to 64 if thats too little)
+    uint64_t global_key_pts;
+    uint32_t back_ptr_div16; //is stored /16
+} syncpoint_t;
+
+typedef struct {
+    uint16_t flags;
+    uint8_t  stream_id;
+    uint16_t size_mul;
+    uint16_t size_lsb;
+    int16_t  pts_delta;
+    uint8_t  reserved_count;
+} FrameCode; // maybe s/FrameCode/framecode_t/ or change all to java style but dont mix
+
+typedef struct {
+    int last_key_frame;  ///<was the last frame a keyfraeme
+    int64_t last_pts;
+    int time_base_id;
+    AVRational time_base;
+    int msb_pts_shift;
+    int max_pts_distance;
+    int decode_delay; //FIXME duplicate of has_b_frames
+} StreamContext;// maybe s/StreamContext/streamcontext_t/
+
+typedef struct {
+    AVFormatContext *avf;
+//    int written_packet_size;
+//    int64_t packet_start[3]; //0-> startcode less, 1-> short startcode 2-> long startcodes
+    FrameCode frame_code[256];
+    uint64_t next_startcode;     ///< stores the next startcode if it has alraedy been parsed but the stream isnt seekable
+    StreamContext *stream;
+    unsigned int max_distance;
+    unsigned int time_base_count;
+    int64_t last_syncpoint_pos;
+    AVRational *time_base;
+} NUTContext;
+
+
+//FIXME move to a common spot, like crc.c/h
+static unsigned long av_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf, unsigned int len){
+    return av_crc(av_crc04C11DB7, checksum, buf, len);
+}