Start working on a branch where FFmpeg is not copied, patched and carved to be built with automake but instead imported inline and built using its own build system. This is an import of a slightly modified FFmpeg current tree. xine-lib builds, install and run fine with it, but there are of course plenty of things that needs to be fixed before it can even be considered for a 1.2.x series. Work will continue in the next days of course.

CVS patchset: 8397
CVS date: 2006/12/02 01:19:48

1 files changed, 1457 insertions, 0 deletions

diff --git a/contrib/ffmpeg/libavformat/nut.c b/contrib/ffmpeg/libavformat/nut.c
new file mode 100644
index 000000000..df64caf15
--- /dev/null
+++ b/contrib/ffmpeg/libavformat/nut.c
@@ -0,0 +1,1457 @@
+/*
+ * "NUT" Container Format muxer and demuxer (DRAFT-200403??)
+ * Copyright (c) 2003 Alex Beregszaszi
+ * Copyright (c) 2004 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
+ *
+ *
+ * Visit the official site at http://www.nut.hu/
+ *
+ */
+
+/*
+ * TODO:
+ * - index writing
+ * - index packet reading support
+*/
+
+//#define DEBUG 1
+
+#include <limits.h>
+#include "avformat.h"
+#include "mpegaudio.h"
+#include "riff.h"
+#include "adler32.h"
+
+#undef NDEBUG
+#include <assert.h>
+
+//#define TRACE
+
+//from /dev/random
+
+#define     MAIN_STARTCODE (0x7A561F5F04ADULL + (((uint64_t)('N'<<8) + 'M')<<48))
+#define   STREAM_STARTCODE (0x11405BF2F9DBULL + (((uint64_t)('N'<<8) + 'S')<<48))
+#define KEYFRAME_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*16-1)
+#define MAX_SHORT_DISTANCE (1024*4-1)
+
+#define FLAG_DATA_SIZE       1
+#define FLAG_KEY_FRAME       2
+#define FLAG_INVALID         4
+
+typedef struct {
+    uint8_t flags;
+    uint8_t stream_id_plus1;
+    uint16_t size_mul;
+    uint16_t size_lsb;
+    int16_t timestamp_delta;
+    uint8_t reserved_count;
+} FrameCode;
+
+typedef struct {
+    int last_key_frame;
+    int msb_timestamp_shift;
+    int rate_num;
+    int rate_den;
+    int64_t last_pts;
+    int64_t last_sync_pos;                    ///<pos of last 1/2 type frame
+    int decode_delay;
+} StreamContext;
+
+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];
+    unsigned int stream_count;
+    uint64_t next_startcode;     ///< stores the next startcode if it has alraedy been parsed but the stream isnt seekable
+    StreamContext *stream;
+    int max_distance;
+    int max_short_distance;
+    int rate_num;
+    int rate_den;
+    int short_startcode;
+} NUTContext;
+
+static char *info_table[][2]={
+        {NULL                   ,  NULL }, // end
+        {NULL                   ,  NULL },
+        {NULL                   , "UTF8"},
+        {NULL                   , "v"},
+        {NULL                   , "s"},
+        {"StreamId"             , "v"},
+        {"SegmentId"            , "v"},
+        {"StartTimestamp"       , "v"},
+        {"EndTimestamp"         , "v"},
+        {"Author"               , "UTF8"},
+        {"Title"                , "UTF8"},
+        {"Description"          , "UTF8"},
+        {"Copyright"            , "UTF8"},
+        {"Encoder"              , "UTF8"},
+        {"Keyword"              , "UTF8"},
+        {"Cover"                , "JPEG"},
+        {"Cover"                , "PNG"},
+};
+
+static void update(NUTContext *nut, int stream_index, int64_t frame_start, int frame_type, int frame_code, int key_frame, int size, int64_t pts){
+    StreamContext *stream= &nut->stream[stream_index];
+
+    stream->last_key_frame= key_frame;
+    nut->packet_start[ frame_type ]= frame_start;
+    stream->last_pts= pts;
+}
+
+static void reset(AVFormatContext *s, int64_t global_ts){
+    NUTContext *nut = s->priv_data;
+    int i;
+
+    for(i=0; i<s->nb_streams; i++){
+        StreamContext *stream= &nut->stream[i];
+
+        stream->last_key_frame= 1;
+
+        stream->last_pts= av_rescale(global_ts, stream->rate_num*(int64_t)nut->rate_den, stream->rate_den*(int64_t)nut->rate_num);
+    }
+}
+
+static void build_frame_code(AVFormatContext *s){
+    NUTContext *nut = s->priv_data;
+    int key_frame, index, pred, stream_id;
+    int start=0;
+    int end= 255;
+    int keyframe_0_esc= s->nb_streams > 2;
+    int pred_table[10];
+
+    if(keyframe_0_esc){
+        /* keyframe = 0 escape */
+        FrameCode *ft= &nut->frame_code[start];
+        ft->flags= FLAG_DATA_SIZE;
+        ft->stream_id_plus1= 0;
+        ft->size_mul=1;
+        ft->timestamp_delta=0;
+        start++;
+    }
+
+    for(stream_id= 0; stream_id<s->nb_streams; stream_id++){
+        int start2= start + (end-start)*stream_id / s->nb_streams;
+        int end2  = start + (end-start)*(stream_id+1) / s->nb_streams;
+        AVCodecContext *codec = s->streams[stream_id]->codec;
+        int is_audio= codec->codec_type == CODEC_TYPE_AUDIO;
+        int intra_only= /*codec->intra_only || */is_audio;
+        int pred_count;
+
+        for(key_frame=0; key_frame<2; key_frame++){
+            if(intra_only && keyframe_0_esc && key_frame==0)
+                continue;
+
+            {
+                FrameCode *ft= &nut->frame_code[start2];
+                ft->flags= FLAG_KEY_FRAME*key_frame;
+                ft->flags|= FLAG_DATA_SIZE;
+                ft->stream_id_plus1= stream_id + 1;
+                ft->size_mul=1;
+                ft->timestamp_delta=0;
+                start2++;
+            }
+        }
+
+        key_frame= intra_only;
+#if 1
+        if(is_audio){
+            int frame_bytes= codec->frame_size*(int64_t)codec->bit_rate / (8*codec->sample_rate);
+            int pts;
+            for(pts=0; pts<2; pts++){
+                for(pred=0; pred<2; pred++){
+                    FrameCode *ft= &nut->frame_code[start2];
+                    ft->flags= FLAG_KEY_FRAME*key_frame;
+                    ft->stream_id_plus1= stream_id + 1;
+                    ft->size_mul=frame_bytes + 2;
+                    ft->size_lsb=frame_bytes + pred;
+                    ft->timestamp_delta=pts;
+                    start2++;
+                }
+            }
+        }else{
+            FrameCode *ft= &nut->frame_code[start2];
+            ft->flags= FLAG_KEY_FRAME | FLAG_DATA_SIZE;
+            ft->stream_id_plus1= stream_id + 1;
+            ft->size_mul=1;
+            ft->timestamp_delta=1;
+            start2++;
+        }
+#endif
+
+        if(codec->has_b_frames){
+            pred_count=5;
+            pred_table[0]=-2;
+            pred_table[1]=-1;
+            pred_table[2]=1;
+            pred_table[3]=3;
+            pred_table[4]=4;
+        }else if(codec->codec_id == CODEC_ID_VORBIS){
+            pred_count=3;
+            pred_table[0]=2;
+            pred_table[1]=9;
+            pred_table[2]=16;
+        }else{
+            pred_count=1;
+            pred_table[0]=1;
+        }
+
+        for(pred=0; pred<pred_count; pred++){
+            int start3= start2 + (end2-start2)*pred / pred_count;
+            int end3  = start2 + (end2-start2)*(pred+1) / pred_count;
+
+            for(index=start3; index<end3; index++){
+                FrameCode *ft= &nut->frame_code[index];
+                ft->flags= FLAG_KEY_FRAME*key_frame;
+                ft->flags|= FLAG_DATA_SIZE;
+                ft->stream_id_plus1= stream_id + 1;
+//FIXME use single byte size and pred from last
+                ft->size_mul= end3-start3;
+                ft->size_lsb= index - start3;
+                ft->timestamp_delta= pred_table[pred];
+            }
+        }
+    }
+    memmove(&nut->frame_code['N'+1], &nut->frame_code['N'], sizeof(FrameCode)*(255-'N'));
+    nut->frame_code['N'].flags= FLAG_INVALID;
+}
+
+static uint64_t get_v(ByteIOContext *bc)
+{
+    uint64_t val = 0;
+
+    for(;;)
+    {
+        int tmp = get_byte(bc);
+
+        if (tmp&0x80)
+            val= (val<<7) + tmp - 0x80;
+        else{
+//av_log(NULL, AV_LOG_DEBUG, "get_v()= %"PRId64"\n", (val<<7) + tmp);
+            return (val<<7) + tmp;
+        }
+    }
+    return -1;
+}
+
+static int get_str(ByteIOContext *bc, char *string, unsigned int maxlen){
+    unsigned int len= get_v(bc);
+
+    if(len && maxlen)
+        get_buffer(bc, string, FFMIN(len, maxlen));
+    while(len > maxlen){
+        get_byte(bc);
+        len--;
+    }
+
+    if(maxlen)
+        string[FFMIN(len, maxlen-1)]= 0;
+
+    if(maxlen == len)
+        return -1;
+    else
+        return 0;
+}
+
+static int64_t get_s(ByteIOContext *bc){
+    int64_t v = get_v(bc) + 1;
+
+    if (v&1) return -(v>>1);
+    else     return  (v>>1);
+}
+
+static uint64_t get_vb(ByteIOContext *bc){
+    uint64_t val=0;
+    unsigned int i= get_v(bc);
+
+    if(i>8)
+        return UINT64_MAX;
+
+    while(i--)
+        val = (val<<8) + get_byte(bc);
+
+//av_log(NULL, AV_LOG_DEBUG, "get_vb()= %"PRId64"\n", val);
+    return val;
+}
+
+#ifdef TRACE
+static inline uint64_t get_v_trace(ByteIOContext *bc, char *file, char *func, int line){
+    uint64_t v= get_v(bc);
+
+    printf("get_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
+    return v;
+}
+
+static inline int64_t get_s_trace(ByteIOContext *bc, char *file, char *func, int line){
+    int64_t v= get_s(bc);
+
+    printf("get_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
+    return v;
+}
+
+static inline uint64_t get_vb_trace(ByteIOContext *bc, char *file, char *func, int line){
+    uint64_t v= get_vb(bc);
+
+    printf("get_vb %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
+    return v;
+}
+#define get_v(bc)  get_v_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
+#define get_s(bc)  get_s_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
+#define get_vb(bc)  get_vb_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
+#endif
+
+
+static int get_packetheader(NUTContext *nut, ByteIOContext *bc, int calculate_checksum)
+{
+    int64_t start, size;
+    start= url_ftell(bc) - 8;
+
+    size= get_v(bc);
+
+    init_checksum(bc, calculate_checksum ? av_adler32_update : NULL, 1);
+
+    nut->packet_start[2] = start;
+    nut->written_packet_size= size;
+
+    return size;
+}
+
+static int check_checksum(ByteIOContext *bc){
+    unsigned long checksum= get_checksum(bc);
+    return checksum != get_be32(bc);
+}
+
+/**
+ *
+ */
+static int get_length(uint64_t val){
+    int i;
+
+    for (i=7; val>>i; i+=7);
+
+    return i;
+}
+
+static uint64_t find_any_startcode(ByteIOContext *bc, int64_t pos){
+    uint64_t state=0;
+
+    if(pos >= 0)
+        url_fseek(bc, pos, SEEK_SET); //note, this may fail if the stream isnt seekable, but that shouldnt matter, as in this case we simply start where we are currently
+
+    while(!url_feof(bc)){
+        state= (state<<8) | get_byte(bc);
+        if((state>>56) != 'N')
+            continue;
+        switch(state){
+        case MAIN_STARTCODE:
+        case STREAM_STARTCODE:
+        case KEYFRAME_STARTCODE:
+        case INFO_STARTCODE:
+        case INDEX_STARTCODE:
+            return state;
+        }
+    }
+
+    return 0;
+}
+
+/**
+ * find the given startcode.
+ * @param code the startcode
+ * @param pos the start position of the search, or -1 if the current position
+ * @returns the position of the startcode or -1 if not found
+ */
+static int64_t find_startcode(ByteIOContext *bc, uint64_t code, int64_t pos){
+    for(;;){
+        uint64_t startcode= find_any_startcode(bc, pos);
+        if(startcode == code)
+            return url_ftell(bc) - 8;
+        else if(startcode == 0)
+            return -1;
+        pos=-1;
+    }
+}
+
+static int64_t lsb2full(StreamContext *stream, int64_t lsb){
+    int64_t mask = (1<<stream->msb_timestamp_shift)-1;
+    int64_t delta= stream->last_pts - mask/2;
+    return  ((lsb - delta)&mask) + delta;
+}
+
+#ifdef CONFIG_MUXERS
+
+static void put_v(ByteIOContext *bc, uint64_t val)
+{
+    int i;
+
+//av_log(NULL, AV_LOG_DEBUG, "put_v()= %"PRId64"\n", val);
+    val &= 0x7FFFFFFFFFFFFFFFULL; // FIXME can only encode upto 63 bits currently
+    i= get_length(val);
+
+    for (i-=7; i>0; i-=7){
+        put_byte(bc, 0x80 | (val>>i));
+    }
+
+    put_byte(bc, val&0x7f);
+}
+
+/**
+ * stores a string as vb.
+ */
+static void put_str(ByteIOContext *bc, const char *string){
+    int len= strlen(string);
+
+    put_v(bc, len);
+    put_buffer(bc, string, len);
+}
+
+static void put_s(ByteIOContext *bc, int64_t val){
+    if (val<=0) put_v(bc, -2*val  );
+    else        put_v(bc,  2*val-1);
+}
+
+static void put_vb(ByteIOContext *bc, uint64_t val){
+    int i;
+
+    for (i=8; val>>i; i+=8);
+
+    put_v(bc, i>>3);
+    for(i-=8; i>=0; i-=8)
+        put_byte(bc, (val>>i)&0xFF);
+}
+
+#ifdef TRACE
+static inline void put_v_trace(ByteIOContext *bc, uint64_t v, char *file, char *func, int line){
+    printf("get_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
+
+    put_v(bc, v);
+}
+
+static inline void put_s_trace(ByteIOContext *bc, int64_t v, char *file, char *func, int line){
+    printf("get_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
+
+    put_s(bc, v);
+}
+
+static inline void put_vb_trace(ByteIOContext *bc, uint64_t v, char *file, char *func, int line){
+    printf("get_vb %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
+
+    put_vb(bc, v);
+}
+#define put_v(bc, v)  put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
+#define put_s(bc, v)  put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
+#define put_vb(bc, v)  put_vb_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
+#endif
+
+static int put_packetheader(NUTContext *nut, ByteIOContext *bc, int max_size, int calculate_checksum)
+{
+    put_flush_packet(bc);
+    nut->packet_start[2]= url_ftell(bc) - 8;
+    nut->written_packet_size = max_size;
+
+    /* packet header */
+    put_v(bc, nut->written_packet_size); /* forward ptr */
+
+    if(calculate_checksum)
+        init_checksum(bc, av_adler32_update, 1);
+
+    return 0;
+}
+
+/**
+ *
+ * must not be called more then once per packet
+ */
+static int update_packetheader(NUTContext *nut, ByteIOContext *bc, int additional_size, int calculate_checksum){
+    int64_t start= nut->packet_start[2];
+    int64_t cur= url_ftell(bc);
+    int size= cur - start - get_length(nut->written_packet_size)/7 - 8;
+
+    if(calculate_checksum)
+        size += 4;
+
+    if(size != nut->written_packet_size){
+        int i;
+
+        assert( size <= nut->written_packet_size );
+
+        url_fseek(bc, start + 8, SEEK_SET);
+        for(i=get_length(size); i < get_length(nut->written_packet_size); i+=7)
+            put_byte(bc, 0x80);
+        put_v(bc, size);
+
+        url_fseek(bc, cur, SEEK_SET);
+        nut->written_packet_size= size; //FIXME may fail if multiple updates with differing sizes, as get_length may differ
+
+        if(calculate_checksum)
+            put_be32(bc, get_checksum(bc));
+    }
+
+    return 0;
+}
+
+static int nut_write_header(AVFormatContext *s)
+{
+    NUTContext *nut = s->priv_data;
+    ByteIOContext *bc = &s->pb;
+    AVCodecContext *codec;
+    int i, j, tmp_time, tmp_flags,tmp_stream, tmp_mul, tmp_size, tmp_fields;
+
+    if (strcmp(s->filename, "./data/b-libav.nut")) {
+        av_log(s, AV_LOG_ERROR, " libavformat NUT is non-compliant and disabled\n");
+        return -1;
+    }
+
+    nut->avf= s;
+
+    nut->stream =
+        av_mallocz(sizeof(StreamContext)*s->nb_streams);
+
+
+    put_buffer(bc, ID_STRING, strlen(ID_STRING));
+    put_byte(bc, 0);
+    nut->packet_start[2]= url_ftell(bc);
+
+    /* main header */
+    put_be64(bc, MAIN_STARTCODE);
+    put_packetheader(nut, bc, 120+5*256, 1);
+    put_v(bc, 2); /* version */
+    put_v(bc, s->nb_streams);
+    put_v(bc, MAX_DISTANCE);
+    put_v(bc, MAX_SHORT_DISTANCE);
+
+    put_v(bc, nut->rate_num=1);
+    put_v(bc, nut->rate_den=2);
+    put_v(bc, nut->short_startcode=0x4EFE79);
+
+    build_frame_code(s);
+    assert(nut->frame_code['N'].flags == FLAG_INVALID);
+
+    tmp_time= tmp_flags= tmp_stream= tmp_mul= tmp_size= /*tmp_res=*/ INT_MAX;
+    for(i=0; i<256;){
+        tmp_fields=0;
+        tmp_size= 0;
+        if(tmp_time   != nut->frame_code[i].timestamp_delta) tmp_fields=1;
+        if(tmp_mul    != nut->frame_code[i].size_mul       ) tmp_fields=2;
+        if(tmp_stream != nut->frame_code[i].stream_id_plus1) tmp_fields=3;
+        if(tmp_size   != nut->frame_code[i].size_lsb       ) tmp_fields=4;
+//        if(tmp_res    != nut->frame_code[i].res            ) tmp_fields=5;
+
+        tmp_time  = nut->frame_code[i].timestamp_delta;
+        tmp_flags = nut->frame_code[i].flags;
+        tmp_stream= nut->frame_code[i].stream_id_plus1;
+        tmp_mul   = nut->frame_code[i].size_mul;
+        tmp_size  = nut->frame_code[i].size_lsb;
+//        tmp_res   = nut->frame_code[i].res;
+
+        for(j=0; i<256; j++,i++){
+            if(nut->frame_code[i].timestamp_delta != tmp_time  ) break;
+            if(nut->frame_code[i].flags           != tmp_flags ) break;
+            if(nut->frame_code[i].stream_id_plus1 != tmp_stream) break;
+            if(nut->frame_code[i].size_mul        != tmp_mul   ) break;
+            if(nut->frame_code[i].size_lsb        != tmp_size+j) break;
+//            if(nut->frame_code[i].res             != tmp_res   ) break;
+        }
+        if(j != tmp_mul - tmp_size) tmp_fields=6;
+
+        put_v(bc, tmp_flags);
+        put_v(bc, tmp_fields);
+        if(tmp_fields>0) put_s(bc, tmp_time);
+        if(tmp_fields>1) put_v(bc, tmp_mul);
+        if(tmp_fields>2) put_v(bc, tmp_stream);
+        if(tmp_fields>3) put_v(bc, tmp_size);
+        if(tmp_fields>4) put_v(bc, 0 /*tmp_res*/);
+        if(tmp_fields>5) put_v(bc, j);
+    }
+
+    update_packetheader(nut, bc, 0, 1);
+
+    /* stream headers */
+    for (i = 0; i < s->nb_streams; i++)
+    {
+        int nom, denom, ssize;
+
+        codec = s->streams[i]->codec;
+
+        put_be64(bc, STREAM_STARTCODE);
+        put_packetheader(nut, bc, 120 + codec->extradata_size, 1);
+        put_v(bc, i /*s->streams[i]->index*/);
+        switch(codec->codec_type){
+        case CODEC_TYPE_VIDEO: put_v(bc, 0); break;
+        case CODEC_TYPE_AUDIO: put_v(bc, 1); break;
+//        case CODEC_TYPE_TEXT : put_v(bc, 2); break;
+        case CODEC_TYPE_DATA : put_v(bc, 3); break;
+        default: return -1;
+        }
+        if (codec->codec_tag)
+            put_vb(bc, codec->codec_tag);
+        else if (codec->codec_type == CODEC_TYPE_VIDEO)
+        {
+            put_vb(bc, codec_get_bmp_tag(codec->codec_id));
+        }
+        else if (codec->codec_type == CODEC_TYPE_AUDIO)
+        {
+            put_vb(bc, codec_get_wav_tag(codec->codec_id));
+        }
+        else
+            put_vb(bc, 0);
+
+        ff_parse_specific_params(codec, &nom, &ssize, &denom);
+
+        nut->stream[i].rate_num= nom;
+        nut->stream[i].rate_den= denom;
+        av_set_pts_info(s->streams[i], 60, denom, nom);
+
+        put_v(bc, codec->bit_rate);
+        put_vb(bc, 0); /* no language code */
+        put_v(bc, nom);
+        put_v(bc, denom);
+        if(nom / denom < 1000)
+            nut->stream[i].msb_timestamp_shift = 7;
+        else
+            nut->stream[i].msb_timestamp_shift = 14;
+        put_v(bc, nut->stream[i].msb_timestamp_shift);
+        put_v(bc, codec->has_b_frames);
+        put_byte(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
+
+        if(codec->extradata_size){
+            put_v(bc, 1);
+            put_v(bc, codec->extradata_size);
+            put_buffer(bc, codec->extradata, codec->extradata_size);
+        }
+        put_v(bc, 0); /* end of codec specific headers */
+
+        switch(codec->codec_type)
+        {
+            case CODEC_TYPE_AUDIO:
+                put_v(bc, codec->sample_rate);
+                put_v(bc, 1);
+                put_v(bc, codec->channels);
+                break;
+            case CODEC_TYPE_VIDEO:
+                put_v(bc, codec->width);
+                put_v(bc, codec->height);
+                put_v(bc, codec->sample_aspect_ratio.num);
+                put_v(bc, codec->sample_aspect_ratio.den);
+                put_v(bc, 0); /* csp type -- unknown */
+                break;
+            default:
+                break;
+        }
+        update_packetheader(nut, bc, 0, 1);
+    }
+
+    /* info header */
+    put_be64(bc, INFO_STARTCODE);
+    put_packetheader(nut, bc, 30+strlen(s->author)+strlen(s->title)+
+        strlen(s->comment)+strlen(s->copyright)+strlen(LIBAVFORMAT_IDENT), 1);
+    if (s->author[0])
+    {
+        put_v(bc, 9); /* type */
+        put_str(bc, s->author);
+    }
+    if (s->title[0])
+    {
+        put_v(bc, 10); /* type */
+        put_str(bc, s->title);
+    }
+    if (s->comment[0])
+    {
+        put_v(bc, 11); /* type */
+        put_str(bc, s->comment);
+    }
+    if (s->copyright[0])
+    {
+        put_v(bc, 12); /* type */
+        put_str(bc, s->copyright);
+    }
+    /* encoder */
+    if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)){
+        put_v(bc, 13); /* type */
+        put_str(bc, LIBAVFORMAT_IDENT);
+    }
+
+    put_v(bc, 0); /* eof info */
+    update_packetheader(nut, bc, 0, 1);
+
+    put_flush_packet(bc);
+
+    return 0;
+}
+
+static int nut_write_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    NUTContext *nut = s->priv_data;
+    StreamContext *stream= &nut->stream[pkt->stream_index];
+    ByteIOContext *bc = &s->pb;
+    int key_frame = 0, full_pts=0;
+    AVCodecContext *enc;
+    int64_t coded_pts;
+    int frame_type, best_length, frame_code, flags, i, size_mul, size_lsb, time_delta;
+    const int64_t frame_start= url_ftell(bc);
+    int64_t pts= pkt->pts;
+    int size= pkt->size;
+    int stream_index= pkt->stream_index;
+
+    enc = s->streams[stream_index]->codec;
+    key_frame = !!(pkt->flags & PKT_FLAG_KEY);
+
+    frame_type=0;
+    if(frame_start + size + 20 - FFMAX(nut->packet_start[1], nut->packet_start[2]) > MAX_DISTANCE)
+        frame_type=2;
+    if(key_frame && !stream->last_key_frame)
+        frame_type=2;
+
+    if(frame_type>1){
+        int64_t global_ts= av_rescale(pts, stream->rate_den*(int64_t)nut->rate_num, stream->rate_num*(int64_t)nut->rate_den);
+        reset(s, global_ts);
+        put_be64(bc, KEYFRAME_STARTCODE);
+        put_v(bc, global_ts);
+    }
+    assert(stream->last_pts != AV_NOPTS_VALUE);
+    coded_pts = pts & ((1<<stream->msb_timestamp_shift)-1);
+    if(lsb2full(stream, coded_pts) != pts)
+        full_pts=1;
+
+    if(full_pts)
+        coded_pts= pts + (1<<stream->msb_timestamp_shift);
+
+    best_length=INT_MAX;
+    frame_code= -1;
+    for(i=0; i<256; i++){
+        int stream_id_plus1= nut->frame_code[i].stream_id_plus1;
+        int fc_key_frame;
+        int length=0;
+        size_mul= nut->frame_code[i].size_mul;
+        size_lsb= nut->frame_code[i].size_lsb;
+        time_delta= nut->frame_code[i].timestamp_delta;
+        flags= nut->frame_code[i].flags;
+
+        assert(size_mul > size_lsb);
+
+        if(stream_id_plus1 == 0) length+= get_length(stream_index);
+        else if(stream_id_plus1 - 1 != stream_index)
+            continue;
+        fc_key_frame= !!(flags & FLAG_KEY_FRAME);
+
+        assert(key_frame==0 || key_frame==1);
+        if(fc_key_frame != key_frame)
+            continue;
+
+        if(flags & FLAG_DATA_SIZE){
+            if(size % size_mul != size_lsb)
+                continue;
+            length += get_length(size / size_mul);
+        }else if(size != size_lsb)
+            continue;
+
+        if(full_pts && time_delta)
+            continue;
+
+        if(!time_delta){
+            length += get_length(coded_pts);
+        }else{
+            if(time_delta != pts - stream->last_pts)
+                continue;
+        }
+
+        if(length < best_length){
+            best_length= length;
+            frame_code=i;
+        }
+//    av_log(s, AV_LOG_DEBUG, "%d %d %d %d %d %d %d %d %d %d\n", key_frame, frame_type, full_pts, size, stream_index, flags, size_mul, size_lsb, stream_id_plus1, length);
+    }
+
+    assert(frame_code != -1);
+    flags= nut->frame_code[frame_code].flags;
+    size_mul= nut->frame_code[frame_code].size_mul;
+    size_lsb= nut->frame_code[frame_code].size_lsb;
+    time_delta= nut->frame_code[frame_code].timestamp_delta;
+#ifdef TRACE
+    best_length /= 7;
+    best_length ++; //frame_code
+    if(frame_type==2){
+        best_length += 8; // startcode
+    }
+    av_log(s, AV_LOG_DEBUG, "kf:%d ft:%d pt:%d fc:%2X len:%2d size:%d stream:%d flag:%d mul:%d lsb:%d s+1:%d pts_delta:%d pts:%"PRId64" fs:%"PRId64"\n", key_frame, frame_type, full_pts ? 1 : 0, frame_code, best_length, size, stream_index, flags, size_mul, size_lsb, nut->frame_code[frame_code].stream_id_plus1,(int)(pts - stream->last_pts), pts, frame_start);
+//    av_log(s, AV_LOG_DEBUG, "%d %d %d\n", stream->lru_pts_delta[0], stream->lru_pts_delta[1], stream->lru_pts_delta[2]);
+#endif
+
+    assert(frame_type != 1); //short startcode not implemented yet
+    put_byte(bc, frame_code);
+
+    if(nut->frame_code[frame_code].stream_id_plus1 == 0)
+        put_v(bc, stream_index);
+    if (!time_delta){
+        put_v(bc, coded_pts);
+    }
+    if(flags & FLAG_DATA_SIZE)
+        put_v(bc, size / size_mul);
+    else
+        assert(size == size_lsb);
+    if(size > MAX_DISTANCE){
+        assert(frame_type > 1);
+    }
+
+    put_buffer(bc, pkt->data, size);
+
+    update(nut, stream_index, frame_start, frame_type, frame_code, key_frame, size, pts);
+
+    return 0;
+}
+
+static int nut_write_trailer(AVFormatContext *s)
+{
+    NUTContext *nut = s->priv_data;
+    ByteIOContext *bc = &s->pb;
+
+#if 0
+    int i;
+
+    /* WRITE INDEX */
+
+    for (i = 0; s->nb_streams; i++)
+    {
+        put_be64(bc, INDEX_STARTCODE);
+        put_packetheader(nut, bc, 64, 1);
+        put_v(bc, s->streams[i]->id);
+        put_v(bc, ...);
+        update_packetheader(nut, bc, 0, 1);
+    }
+#endif
+
+    put_flush_packet(bc);
+
+    av_freep(&nut->stream);
+
+    return 0;
+}
+#endif //CONFIG_MUXERS
+
+static int nut_probe(AVProbeData *p)
+{
+    int i;
+    uint64_t code= 0xff;
+
+    for (i = 0; i < p->buf_size; i++) {
+        code = (code << 8) | p->buf[i];
+        if (code == MAIN_STARTCODE)
+            return AVPROBE_SCORE_MAX;
+    }
+    return 0;
+}
+
+static int decode_main_header(NUTContext *nut){
+    AVFormatContext *s= nut->avf;
+    ByteIOContext *bc = &s->pb;
+    uint64_t tmp;
+    int i, j, tmp_stream, tmp_mul, tmp_time, tmp_size, count, tmp_res;
+
+    get_packetheader(nut, bc, 1);
+
+    tmp = get_v(bc);
+    if (tmp != 2){
+        av_log(s, AV_LOG_ERROR, "bad version (%"PRId64")\n", tmp);
+        return -1;
+    }
+
+    nut->stream_count = get_v(bc);
+    if(nut->stream_count > MAX_STREAMS){
+        av_log(s, AV_LOG_ERROR, "too many streams\n");
+        return -1;
+    }
+    nut->max_distance = get_v(bc);
+    nut->max_short_distance = get_v(bc);
+    nut->rate_num= get_v(bc);
+    nut->rate_den= get_v(bc);
+    nut->short_startcode= get_v(bc);
+    if(nut->short_startcode>>16 != 'N'){
+        av_log(s, AV_LOG_ERROR, "invalid short startcode %X\n", nut->short_startcode);
+        return -1;
+    }
+
+    for(i=0; i<256;){
+        int tmp_flags = get_v(bc);
+        int tmp_fields= get_v(bc);
+        if(tmp_fields>0) tmp_time  = get_s(bc);
+        if(tmp_fields>1) tmp_mul   = get_v(bc);
+        if(tmp_fields>2) tmp_stream= get_v(bc);
+        if(tmp_fields>3) tmp_size  = get_v(bc);
+        else             tmp_size  = 0;
+        if(tmp_fields>4) tmp_res   = get_v(bc);
+        else             tmp_res   = 0;
+        if(tmp_fields>5) count     = get_v(bc);
+        else             count     = tmp_mul - tmp_size;
+
+        while(tmp_fields-- > 6)
+           get_v(bc);
+
+        if(count == 0 || i+count > 256){
+            av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);
+            return -1;
+        }
+        if(tmp_stream > nut->stream_count + 1){
+            av_log(s, AV_LOG_ERROR, "illegal stream number\n");
+            return -1;
+        }
+
+        for(j=0; j<count; j++,i++){
+            nut->frame_code[i].flags           = tmp_flags ;
+            nut->frame_code[i].timestamp_delta = tmp_time  ;
+            nut->frame_code[i].stream_id_plus1 = tmp_stream;
+            nut->frame_code[i].size_mul        = tmp_mul   ;
+            nut->frame_code[i].size_lsb        = tmp_size+j;
+            nut->frame_code[i].reserved_count  = tmp_res   ;
+        }
+    }
+    if(nut->frame_code['N'].flags != FLAG_INVALID){
+        av_log(s, AV_LOG_ERROR, "illegal frame_code table\n");
+        return -1;
+    }
+
+    if(check_checksum(bc)){
+        av_log(s, AV_LOG_ERROR, "Main header checksum mismatch\n");
+        return -1;
+    }
+
+    return 0;
+}
+
+static int decode_stream_header(NUTContext *nut){
+    AVFormatContext *s= nut->avf;
+    ByteIOContext *bc = &s->pb;
+    int class, nom, denom, stream_id;
+    uint64_t tmp;
+    AVStream *st;
+
+    get_packetheader(nut, bc, 1);
+    stream_id= get_v(bc);
+    if(stream_id >= nut->stream_count || s->streams[stream_id])
+        return -1;
+
+    st = av_new_stream(s, stream_id);
+    if (!st)
+        return AVERROR_NOMEM;
+
+    class = get_v(bc);
+    tmp = get_vb(bc);
+    st->codec->codec_tag= tmp;
+    switch(class)
+    {
+        case 0:
+            st->codec->codec_type = CODEC_TYPE_VIDEO;
+            st->codec->codec_id = codec_get_bmp_id(tmp);
+            if (st->codec->codec_id == CODEC_ID_NONE)
+                av_log(s, AV_LOG_ERROR, "Unknown codec?!\n");
+            break;
+        case 1:
+        case 32: //compatibility
+            st->codec->codec_type = CODEC_TYPE_AUDIO;
+            st->codec->codec_id = codec_get_wav_id(tmp);
+            if (st->codec->codec_id == CODEC_ID_NONE)
+                av_log(s, AV_LOG_ERROR, "Unknown codec?!\n");
+            break;
+        case 2:
+//            st->codec->codec_type = CODEC_TYPE_TEXT;
+//            break;
+        case 3:
+            st->codec->codec_type = CODEC_TYPE_DATA;
+            break;
+        default:
+            av_log(s, AV_LOG_ERROR, "Unknown stream class (%d)\n", class);
+            return -1;
+    }
+    s->bit_rate += get_v(bc);
+    get_vb(bc); /* language code */
+    nom = get_v(bc);
+    denom = get_v(bc);
+    nut->stream[stream_id].msb_timestamp_shift = get_v(bc);
+    st->codec->has_b_frames=
+    nut->stream[stream_id].decode_delay= get_v(bc);
+    get_byte(bc); /* flags */
+
+    /* codec specific data headers */
+    while(get_v(bc) != 0){
+        st->codec->extradata_size= get_v(bc);
+        if((unsigned)st->codec->extradata_size > (1<<30))
+            return -1;
+        st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
+        get_buffer(bc, st->codec->extradata, st->codec->extradata_size);
+//            url_fskip(bc, get_v(bc));
+    }
+
+    if (st->codec->codec_type == CODEC_TYPE_VIDEO) /* VIDEO */
+    {
+        st->codec->width = get_v(bc);
+        st->codec->height = get_v(bc);
+        st->codec->sample_aspect_ratio.num= get_v(bc);
+        st->codec->sample_aspect_ratio.den= get_v(bc);
+        get_v(bc); /* csp type */
+    }
+    if (st->codec->codec_type == CODEC_TYPE_AUDIO) /* AUDIO */
+    {
+        st->codec->sample_rate = get_v(bc);
+        get_v(bc); // samplerate_den
+        st->codec->channels = get_v(bc);
+    }
+    if(check_checksum(bc)){
+        av_log(s, AV_LOG_ERROR, "Stream header %d checksum mismatch\n", stream_id);
+        return -1;
+    }
+    av_set_pts_info(s->streams[stream_id], 60, denom, nom);
+    nut->stream[stream_id].rate_num= nom;
+    nut->stream[stream_id].rate_den= denom;
+    return 0;
+}
+
+static int decode_info_header(NUTContext *nut){
+    AVFormatContext *s= nut->avf;
+    ByteIOContext *bc = &s->pb;
+
+    get_packetheader(nut, bc, 1);
+
+    for(;;){
+        int id= get_v(bc);
+        char *name, *type, custom_name[256], custom_type[256];
+
+        if(!id)
+            break;
+        else if(id >= sizeof(info_table)/sizeof(info_table[0])){
+            av_log(s, AV_LOG_ERROR, "info id is too large %d %zd\n", id, sizeof(info_table)/sizeof(info_table[0]));
+            return -1;
+        }
+
+        type= info_table[id][1];
+        name= info_table[id][0];
+//av_log(s, AV_LOG_DEBUG, "%d %s %s\n", id, type, name);
+
+        if(!type){
+            get_str(bc, custom_type, sizeof(custom_type));
+            type= custom_type;
+        }
+        if(!name){
+            get_str(bc, custom_name, sizeof(custom_name));
+            name= custom_name;
+        }
+
+        if(!strcmp(type, "v")){
+            get_v(bc);
+        }else{
+            if(!strcmp(name, "Author"))
+                get_str(bc, s->author, sizeof(s->author));
+            else if(!strcmp(name, "Title"))
+                get_str(bc, s->title, sizeof(s->title));
+            else if(!strcmp(name, "Copyright"))
+                get_str(bc, s->copyright, sizeof(s->copyright));
+            else if(!strcmp(name, "Description"))
+                get_str(bc, s->comment, sizeof(s->comment));
+            else
+                get_str(bc, NULL, 0);
+        }
+    }
+    if(check_checksum(bc)){
+        av_log(s, AV_LOG_ERROR, "Info header checksum mismatch\n");
+        return -1;
+    }
+    return 0;
+}
+
+static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap)
+{
+    NUTContext *nut = s->priv_data;
+    ByteIOContext *bc = &s->pb;
+    int64_t pos;
+    int inited_stream_count;
+
+    nut->avf= s;
+
+    /* main header */
+    pos=0;
+    for(;;){
+        pos= find_startcode(bc, MAIN_STARTCODE, pos)+1;
+        if (pos<0){
+            av_log(s, AV_LOG_ERROR, "no main startcode found\n");
+            return -1;
+        }
+        if(decode_main_header(nut) >= 0)
+            break;
+    }
+
+
+    s->bit_rate = 0;
+
+    nut->stream = av_malloc(sizeof(StreamContext)*nut->stream_count);
+
+    /* stream headers */
+    pos=0;
+    for(inited_stream_count=0; inited_stream_count < nut->stream_count;){
+        pos= find_startcode(bc, STREAM_STARTCODE, pos)+1;
+        if (pos<0+1){
+            av_log(s, AV_LOG_ERROR, "not all stream headers found\n");
+            return -1;
+        }
+        if(decode_stream_header(nut) >= 0)
+            inited_stream_count++;
+    }
+
+    /* info headers */
+    pos=0;
+    for(;;){
+        uint64_t startcode= find_any_startcode(bc, pos);
+        pos= url_ftell(bc);
+
+        if(startcode==0){
+            av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
+            return -1;
+        }else if(startcode == KEYFRAME_STARTCODE){
+            nut->next_startcode= startcode;
+            break;
+        }else if(startcode != INFO_STARTCODE){
+            continue;
+        }
+
+        decode_info_header(nut);
+    }
+
+    return 0;
+}
+
+static int decode_frame_header(NUTContext *nut, int *key_frame_ret, int64_t *pts_ret, int *stream_id_ret, int frame_code, int frame_type, int64_t frame_start){
+    AVFormatContext *s= nut->avf;
+    StreamContext *stream;
+    ByteIOContext *bc = &s->pb;
+    int size, flags, size_mul, size_lsb, stream_id, time_delta;
+    int64_t pts = 0;
+
+    if(frame_type < 2 && frame_start - nut->packet_start[2] > nut->max_distance){
+        av_log(s, AV_LOG_ERROR, "last frame must have been damaged\n");
+        return -1;
+    }
+
+    if(frame_type)
+        nut->packet_start[ frame_type ]= frame_start; //otherwise 1 goto 1 may happen
+
+    flags= nut->frame_code[frame_code].flags;
+    size_mul= nut->frame_code[frame_code].size_mul;
+    size_lsb= nut->frame_code[frame_code].size_lsb;
+    stream_id= nut->frame_code[frame_code].stream_id_plus1 - 1;
+    time_delta= nut->frame_code[frame_code].timestamp_delta;
+
+    if(stream_id==-1)
+        stream_id= get_v(bc);
+    if(stream_id >= s->nb_streams){
+        av_log(s, AV_LOG_ERROR, "illegal stream_id\n");
+        return -1;
+    }
+    stream= &nut->stream[stream_id];
+
+//    av_log(s, AV_LOG_DEBUG, "ft:%d ppts:%d %d %d\n", frame_type, stream->lru_pts_delta[0], stream->lru_pts_delta[1], stream->lru_pts_delta[2]);
+
+    *key_frame_ret= !!(flags & FLAG_KEY_FRAME);
+
+    if(!time_delta){
+        int64_t mask = (1<<stream->msb_timestamp_shift)-1;
+        pts= get_v(bc);
+        if(pts > mask){
+            pts -= mask+1;
+        }else{
+            if(stream->last_pts == AV_NOPTS_VALUE){
+                av_log(s, AV_LOG_ERROR, "no reference pts available\n");
+                return -1;
+            }
+            pts= lsb2full(stream, pts);
+        }
+    }else{
+        if(stream->last_pts == AV_NOPTS_VALUE){
+            av_log(s, AV_LOG_ERROR, "no reference pts available\n");
+            return -1;
+        }
+        pts= stream->last_pts + time_delta;
+    }
+
+    if(*key_frame_ret){
+//        av_log(s, AV_LOG_DEBUG, "stream:%d start:%"PRId64" pts:%"PRId64" length:%"PRId64"\n",stream_id, frame_start, av_pts, frame_start - nut->stream[stream_id].last_sync_pos);
+        av_add_index_entry(
+            s->streams[stream_id],
+            frame_start,
+            pts,
+            0,
+            frame_start - nut->stream[stream_id].last_sync_pos,
+            AVINDEX_KEYFRAME);
+        nut->stream[stream_id].last_sync_pos= frame_start;
+//                assert(nut->packet_start == frame_start);
+    }
+
+    assert(size_mul > size_lsb);
+    size= size_lsb;
+    if(flags & FLAG_DATA_SIZE)
+        size+= size_mul*get_v(bc);
+
+#ifdef TRACE
+av_log(s, AV_LOG_DEBUG, "fs:%"PRId64" fc:%d ft:%d kf:%d pts:%"PRId64" size:%d mul:%d lsb:%d flags:%d delta:%d\n", frame_start, frame_code, frame_type, *key_frame_ret, pts, size, size_mul, size_lsb, flags, time_delta);
+#endif
+
+    if(frame_type==0 && url_ftell(bc) - nut->packet_start[2] + size > nut->max_distance){
+        av_log(s, AV_LOG_ERROR, "frame size too large\n");
+        return -1;
+    }
+
+    *stream_id_ret = stream_id;
+    *pts_ret = pts;
+
+    update(nut, stream_id, frame_start, frame_type, frame_code, *key_frame_ret, size, pts);
+
+    return size;
+}
+
+static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code, int frame_type, int64_t frame_start){
+    AVFormatContext *s= nut->avf;
+    ByteIOContext *bc = &s->pb;
+    int size, stream_id, key_frame, discard;
+    int64_t pts, last_IP_pts;
+
+    size= decode_frame_header(nut, &key_frame, &pts, &stream_id, frame_code, frame_type, frame_start);
+    if(size < 0)
+        return -1;
+
+    discard= s->streams[ stream_id ]->discard;
+    last_IP_pts= s->streams[ stream_id ]->last_IP_pts;
+    if(  (discard >= AVDISCARD_NONKEY && !key_frame)
+       ||(discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE && last_IP_pts > pts)
+       || discard >= AVDISCARD_ALL){
+        url_fskip(bc, size);
+        return 1;
+    }
+
+    av_get_packet(bc, pkt, size);
+    pkt->stream_index = stream_id;
+    if (key_frame)
+        pkt->flags |= PKT_FLAG_KEY;
+    pkt->pts = pts;
+
+    return 0;
+}
+
+static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    NUTContext *nut = s->priv_data;
+    ByteIOContext *bc = &s->pb;
+    int i, frame_code=0, ret;
+
+    for(;;){
+        int64_t pos= url_ftell(bc);
+        int frame_type= 0;
+        uint64_t tmp= nut->next_startcode;
+        nut->next_startcode=0;
+
+        if (url_feof(bc))
+            return -1;
+
+        if(tmp){
+            pos-=8;
+        }else{
+            frame_code = get_byte(bc);
+            if(frame_code == 'N'){
+                tmp= frame_code;
+                for(i=1; i<8; i++)
+                    tmp = (tmp<<8) + get_byte(bc);
+            }
+        }
+        switch(tmp){
+        case MAIN_STARTCODE:
+        case STREAM_STARTCODE:
+        case INDEX_STARTCODE:
+            get_packetheader(nut, bc, 0);
+            assert(nut->packet_start[2] == pos);
+            url_fseek(bc, nut->written_packet_size, SEEK_CUR);
+            break;
+        case INFO_STARTCODE:
+            if(decode_info_header(nut)<0)
+                goto resync;
+            break;
+        case KEYFRAME_STARTCODE:
+            frame_type = 2;
+            reset(s, get_v(bc));
+            frame_code = get_byte(bc);
+        case 0:
+            ret= decode_frame(nut, pkt, frame_code, frame_type, pos);
+            if(ret==0)
+                return 0;
+            else if(ret==1) //ok but discard packet
+                break;
+        default:
+resync:
+av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", nut->packet_start[2]+1);
+            tmp= find_any_startcode(bc, nut->packet_start[2]+1);
+            if(tmp==0)
+                return -1;
+av_log(s, AV_LOG_DEBUG, "sync\n");
+            nut->next_startcode= tmp;
+        }
+    }
+}
+
+static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index, int64_t *pos_arg, int64_t pos_limit){
+    NUTContext *nut = s->priv_data;
+    StreamContext *stream;
+    ByteIOContext *bc = &s->pb;
+    int64_t pos, pts;
+    uint64_t code;
+    int frame_code,step, stream_id, i,size, key_frame;
+av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n", stream_index, *pos_arg, pos_limit);
+
+    if(*pos_arg < 0)
+        return AV_NOPTS_VALUE;
+
+    pos= *pos_arg;
+    step= FFMIN(16*1024, pos);
+    do{
+        pos-= step;
+        code= find_any_startcode(bc, pos);
+
+        if(code && url_ftell(bc) - 8 <= *pos_arg)
+            break;
+        step= FFMIN(2*step, pos);
+    }while(step);
+
+    if(!code) //nothing found, not even after pos_arg
+        return AV_NOPTS_VALUE;
+
+    url_fseek(bc, -8, SEEK_CUR);
+    for(i=0; i<s->nb_streams; i++)
+        nut->stream[i].last_sync_pos= url_ftell(bc);
+
+    for(;;){
+        int frame_type=0;
+        int64_t pos= url_ftell(bc);
+        uint64_t tmp=0;
+
+        if(pos > pos_limit || url_feof(bc))
+            return AV_NOPTS_VALUE;
+
+        frame_code = get_byte(bc);
+        if(frame_code == 'N'){
+            tmp= frame_code;
+            for(i=1; i<8; i++)
+                tmp = (tmp<<8) + get_byte(bc);
+        }
+//av_log(s, AV_LOG_DEBUG, "before switch %"PRIX64" at=%"PRId64"\n", tmp, pos);
+
+        switch(tmp){
+        case MAIN_STARTCODE:
+        case STREAM_STARTCODE:
+        case INDEX_STARTCODE:
+        case INFO_STARTCODE:
+            get_packetheader(nut, bc, 0);
+            assert(nut->packet_start[2]==pos);
+            url_fseek(bc, nut->written_packet_size, SEEK_CUR);
+            break;
+        case KEYFRAME_STARTCODE:
+            frame_type=2;
+            reset(s, get_v(bc));
+            frame_code = get_byte(bc);
+        case 0:
+            size= decode_frame_header(nut, &key_frame, &pts, &stream_id, frame_code, frame_type, pos);
+            if(size < 0)
+                goto resync;
+
+            stream= &nut->stream[stream_id];
+            if(stream_id != stream_index || !key_frame || pos < *pos_arg){
+                url_fseek(bc, size, SEEK_CUR);
+                break;
+            }
+
+            *pos_arg= pos;
+            return pts;
+        default:
+resync:
+av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", nut->packet_start[2]+1);
+            if(!find_any_startcode(bc, nut->packet_start[2]+1))
+                return AV_NOPTS_VALUE;
+
+            url_fseek(bc, -8, SEEK_CUR);
+        }
+    }
+    return AV_NOPTS_VALUE;
+}
+
+static int nut_read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
+//    NUTContext *nut = s->priv_data;
+    int64_t pos;
+
+    if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
+        return -1;
+
+    pos= url_ftell(&s->pb);
+    nut_read_timestamp(s, stream_index, &pos, pos-1);
+
+    return 0;
+}
+
+static int nut_read_close(AVFormatContext *s)
+{
+    NUTContext *nut = s->priv_data;
+
+    av_freep(&nut->stream);
+
+    return 0;
+}
+
+#ifdef CONFIG_NUT_DEMUXER
+AVInputFormat nut_demuxer = {
+    "nut",
+    "nut format",
+    sizeof(NUTContext),
+    nut_probe,
+    nut_read_header,
+    nut_read_packet,
+    nut_read_close,
+    nut_read_seek,
+    nut_read_timestamp,
+    .extensions = "nut",
+};
+#endif
+#ifdef CONFIG_NUT_MUXER
+AVOutputFormat nut_muxer = {
+    "nut",
+    "nut format",
+    "video/x-nut",
+    "nut",
+    sizeof(NUTContext),
+#ifdef CONFIG_LIBVORBIS
+    CODEC_ID_VORBIS,
+#elif defined(CONFIG_MP3LAME)
+    CODEC_ID_MP3,
+#else
+    CODEC_ID_MP2, /* AC3 needs liba52 decoder */
+#endif
+    CODEC_ID_MPEG4,
+    nut_write_header,
+    nut_write_packet,
+    nut_write_trailer,
+    .flags = AVFMT_GLOBALHEADER,
+};
+#endif