Replace idiotic (what moron wrote that code?) "buffer overflow" message by
[ffmpeg.git] / libavformat / nut.c
index ca80ad3..546bde1 100644 (file)
 /*
- * "NUT" Container Format muxer and demuxer (DRAFT-200403??)
- * Copyright (c) 2003 Alex Beregszaszi
- * Copyright (c) 2004 Michael Niedermayer
+ * nut
+ * Copyright (c) 2004-2007 Michael Niedermayer
  *
- * This library is free software; you can redistribute it and/or
+ * 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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
  *
- * This library is distributed in the hope that it will be useful,
+ * 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 General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
- *
- * NUT DRAFT can be found in MPlayer CVS at DOCS/tech/mpcf.txt
- *
- * AND http://people.fsn.hu/~alex/nut/ (TeX, pdf, ps, dvi, ..)
- *
+ * 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
  */
 
-/*
- * TODO:
- * - checksumming
- * - seeking
- * - index writing
- * - index packet reading support
- * - startcode searching for broken streams
-*/
-
-//#define DEBUG 1
-
-#include <limits.h>
-#include "avformat.h"
-#include "mpegaudio.h"
-#include "avi.h"
-
-#undef NDEBUG
-#include <assert.h>
-
-//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 MAX_TYPE1_DISTANCE (1024*16-1)
-#define MAX_TYPE2_DISTANCE (1024*64-1)
-
-#define MAX_SIZE_LRU 2
-#define MAX_PTS_LRU 3
-
-#define FLAG_FRAME_TYPE      1
-#define FLAG_DATA_SIZE       2
-#define FLAG_PTS            16
-#define FLAG_FULL_PTS        4
-#define FLAG_KEY_FRAME      32
-#define FLAG_PRED_KEY_FRAME 64
-
-typedef struct {
-    uint8_t flags;
-    uint8_t stream_id_plus1;
-    uint8_t size_mul;
-    uint8_t size_lsb;
-} FrameCode;
-
-typedef struct {
-    int last_key_frame;
-    int msb_timestamp_shift;
-    int rate_num;
-    int rate_den;
-    int64_t last_pts;
-    int64_t last_full_pts;
-    int lru_pts_delta[MAX_PTS_LRU];
-    int lru_size[MAX_SIZE_LRU];
-    int initial_pts_predictor[MAX_PTS_LRU];
-    int initial_size_predictor[MAX_SIZE_LRU];
-} StreamContext;
-
-typedef struct {
-    AVFormatContext *avf;
-    int64_t packet_start;
-    int64_t last_packet_start;
-    int written_packet_size;
-    int64_t packet_size_pos;
-    int64_t last_frame_start[3];
-    FrameCode frame_code[256];
-    StreamContext *stream;
-} 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"},
-       {"Titel"                , "UTF8"},
-       {"Description"          , "UTF8"},
-       {"Copyright"            , "UTF8"},
-       {"Encoder"              , "UTF8"},
-       {"Keyword"              , "UTF8"},
-       {"Cover"                , "JPEG"},
-       {"Cover"                , "PNG"},
-};
-
-static void update_lru(int *lru, int current, int count){
-    int i;
-
-    for(i=0; i<count-1; i++){
-        if(lru[i] == current)
-            break;
-    }
-
-    for(; i; i--){
-        lru[i]= lru[i-1];
-    }
-
-    lru[0]= current;
-}
-
-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->last_frame_start[ frame_type ]= frame_start;
-    update_lru(stream->lru_pts_delta, pts - stream->last_pts, 3);
-    update_lru(stream->lru_size     ,                   size, 2);
-    stream->last_pts= pts;
-    if(    nut->frame_code[frame_code].flags & FLAG_PTS 
-        && nut->frame_code[frame_code].flags & FLAG_FULL_PTS)
-        stream->last_full_pts= pts;
-}
+#include "nut.h"
+#include "tree.h"
 
-static void reset(AVFormatContext *s/*, int frame_type*/){
-    NUTContext *nut = s->priv_data;
+void ff_nut_reset_ts(NUTContext *nut, AVRational time_base, int64_t val){
     int i;
-    
-    for(i=0; i<s->nb_streams; i++){
-        StreamContext *stream= &nut->stream[i];
-    
-        stream->last_key_frame= 1;
-        memcpy(stream->lru_pts_delta, stream->initial_pts_predictor, sizeof(int)*MAX_PTS_LRU);
-        memcpy(stream->lru_size, stream->initial_size_predictor, sizeof(int)*MAX_SIZE_LRU);
+    for(i=0; i<nut->avf->nb_streams; i++){
+        nut->stream[i].last_pts= av_rescale_rnd(
+            val / nut->time_base_count,
+            time_base.num * (int64_t)nut->stream[i].time_base->den,
+            time_base.den * (int64_t)nut->stream[i].time_base->num,
+            AV_ROUND_DOWN);
     }
 }
 
-static void build_frame_code(AVFormatContext *s){
-    NUTContext *nut = s->priv_data;
-    int key_frame, frame_type, full_pts, index, pred, stream_id;
-    int start=0;
-    int end= 255;
-    int keyframe_0_esc= s->nb_streams > 2;
-
-    if(keyframe_0_esc){
-        /* keyframe = 0 escapes, 3 codes */
-        for(frame_type=0; frame_type<2; frame_type++){
-            for(full_pts=frame_type; full_pts<2; full_pts++){
-                FrameCode *ft= &nut->frame_code[start];
-                ft->flags= FLAG_FRAME_TYPE*frame_type + FLAG_FULL_PTS*full_pts;
-                ft->flags|= FLAG_DATA_SIZE | FLAG_PTS; 
-                ft->stream_id_plus1= 0;
-                ft->size_mul=1;
-                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;
-            
-            for(frame_type=0; frame_type<2; frame_type++){
-                for(full_pts=frame_type; full_pts<2; full_pts++){
-                    FrameCode *ft= &nut->frame_code[start2];
-                    ft->flags= FLAG_FRAME_TYPE*frame_type + FLAG_FULL_PTS*full_pts + FLAG_KEY_FRAME*key_frame;
-                    ft->flags|= FLAG_DATA_SIZE | FLAG_PTS;
-                    ft->stream_id_plus1= stream_id + 1;
-                    ft->size_mul=1;
-                    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);
-            for(pred=0; pred<MAX_SIZE_LRU; pred++){
-                for(frame_type=0; frame_type<1; frame_type++){
-                    FrameCode *ft= &nut->frame_code[start2];
-                    ft->flags= FLAG_KEY_FRAME*key_frame + (FLAG_FULL_PTS+FLAG_PTS+FLAG_FRAME_TYPE)*frame_type;
-                    ft->stream_id_plus1= stream_id + 1;
-                    ft->size_mul=1;
-                    ft->size_lsb=1 + pred;
-                    start2++;
-                }
-                nut->stream[stream_id].initial_size_predictor[pred]= frame_bytes + pred;
-            }
-        }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;
-            start2++;
-        }
-#endif
-        pred_count= 2 + codec->has_b_frames + (codec->codec_id == CODEC_ID_VORBIS);
-        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 + pred*4;
-                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;
-            }
-            nut->stream[stream_id].initial_pts_predictor[pred]= pred+1;
-        }
-    }
-    memmove(&nut->frame_code['N'+1], &nut->frame_code['N'], sizeof(FrameCode)*(255-'N'));
-    nut->frame_code['N'].flags= 1;
+int64_t ff_lsb2full(StreamContext *stream, int64_t lsb){
+    int64_t mask = (1<<stream->msb_pts_shift)-1;
+    int64_t delta= stream->last_pts - mask/2;
+    return  ((lsb - delta)&mask) + delta;
 }
 
-static int bytes_left(ByteIOContext *bc)
-{
-    return bc->buf_end - bc->buf_ptr;
-}
-
-static uint64_t get_v(ByteIOContext *bc)
-{
-    uint64_t val = 0;
-
-    for(; bytes_left(bc) > 0; )
-    {
-       int tmp = get_byte(bc);
-
-       if (tmp&0x80)
-           val= (val<<7) + tmp - 0x80;
-       else
-           return (val<<7) + tmp;
-    }
-    return -1;
+int ff_nut_sp_pos_cmp(syncpoint_t *a, syncpoint_t *b){
+    return ((a->pos - b->pos) >> 32) - ((b->pos - a->pos) >> 32);
 }
 
-static int get_str(ByteIOContext *bc, char *string, int maxlen){
-    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;
+int ff_nut_sp_pts_cmp(syncpoint_t *a, syncpoint_t *b){
+    return ((a->ts - b->ts) >> 32) - ((b->ts - a->ts) >> 32);
 }
 
-static int get_packetheader(NUTContext *nut, ByteIOContext *bc, int prefix_length)
-{
-    int64_t start, size, last_size;
-    start= url_ftell(bc) - prefix_length;
-
-    if(start != nut->packet_start + nut->written_packet_size){
-        av_log(nut->avf, AV_LOG_ERROR, "get_packetheader called at weird position\n");
-        return -1;
-    }
-
-    size= get_v(bc);
-    last_size= get_v(bc);
-    if(nut->written_packet_size != last_size){
-        av_log(nut->avf, AV_LOG_ERROR, "packet size missmatch %d != %lld at %lld\n", nut->written_packet_size, last_size, start);
-        return -1;
-    }
-
-    nut->last_packet_start = nut->packet_start;
-    nut->packet_start = start;
-    nut->written_packet_size= size;
-
-    return size;
-}
-
-/**
- * 
- */
-static int get_length(uint64_t val){
-    int i;
-
-    for (i=7; ; i+=7)
-       if ((val>>i) == 0)
-           return i;
-
-    return 7; //not reached
-}
-
-#ifdef CONFIG_ENCODERS
-static int put_v(ByteIOContext *bc, uint64_t val)
-{
-    int i;
-//    if (bytes_left(s)*8 < 9)
-//     return -1;
-
-    if (bytes_left(bc) < 1)
-       return -1;
-
-    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);
-
-    return 0;
-}
-
-static int put_str(ByteIOContext *bc, const char *string){
-    int len= strlen(string);
-    
-    put_v(bc, len);
-    put_buffer(bc, string, len);
-    
-    return 0;
-}
-
-static int put_packetheader(NUTContext *nut, ByteIOContext *bc, int max_size)
-{
-    put_flush_packet(bc);
-    nut->last_packet_start= nut->packet_start;
-    nut->packet_start+= nut->written_packet_size;
-    nut->packet_size_pos = url_ftell(bc);
-    nut->written_packet_size = max_size;
-
-    /* packet header */
-    put_v(bc, nut->written_packet_size); /* forward ptr */
-    put_v(bc, nut->packet_start - nut->last_packet_start); /* backward ptr */
-
-    return 0;
-}
-
-static int update_packetheader(NUTContext *nut, ByteIOContext *bc, int additional_size){
-    int64_t start= nut->packet_start;
-    int64_t cur= url_ftell(bc);
-    int size= cur - start + additional_size;
-    
-    if(size != nut->written_packet_size){
-        int i;
-
-        assert( size <= nut->written_packet_size );
-    
-        url_fseek(bc, nut->packet_size_pos, 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
-    }
-    
-    return 0;
-}
-
-static int nut_write_header(AVFormatContext *s)
-{
-    NUTContext *nut = s->priv_data;
-    ByteIOContext *bc = &s->pb;
-    AVCodecContext *codec;
-    int i, j;
-
-    nut->avf= s;
-    
-    nut->stream =      
-       av_mallocz(sizeof(StreamContext)*s->nb_streams);
-    
-    av_set_pts_info(s, 60, 1, AV_TIME_BASE);
-    
-    /* main header */
-    put_be64(bc, MAIN_STARTCODE);
-    put_packetheader(nut, bc, 120+5*256);
-    put_v(bc, 1); /* version */
-    put_v(bc, s->nb_streams);
-    put_v(bc, 3); /* checksum threshold */
-    
-    build_frame_code(s);
-    assert(nut->frame_code['N'].flags == 1);
-    for(i=0; i<256;){
-        int tmp_flags = nut->frame_code[i].flags;
-        int tmp_stream= nut->frame_code[i].stream_id_plus1;
-        int tmp_mul   = nut->frame_code[i].size_mul;
-        int tmp_size  = nut->frame_code[i].size_lsb;
-        put_v(bc, tmp_flags);
-        put_v(bc, tmp_stream);
-        put_v(bc, tmp_mul);
-        put_v(bc, tmp_size);
-
-        for(j=0; i<256; j++,i++){
-            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  ) break;
-            if(++tmp_size >= tmp_mul){
-                tmp_size=0;
-                tmp_stream++;
-            }
-        }
-        put_v(bc, j);
-    }
-
-    put_be32(bc, 0); /* FIXME: checksum */
-    
-    update_packetheader(nut, bc, 0);
-    
-    /* stream headers */
-    for (i = 0; i < s->nb_streams; i++)
-    {
-       int nom, denom, gcd;
-
-       codec = &s->streams[i]->codec;
-       
-       put_be64(bc, STREAM_STARTCODE);
-       put_packetheader(nut, bc, 120 + codec->extradata_size);
-       put_v(bc, i /*s->streams[i]->index*/);
-       put_v(bc, (codec->codec_type == CODEC_TYPE_AUDIO) ? 32 : 0);
-       if (codec->codec_tag)
-           put_v(bc, codec->codec_tag);
-       else if (codec->codec_type == CODEC_TYPE_VIDEO)
-       {
-           put_v(bc, codec_get_bmp_tag(codec->codec_id));
-       }
-       else if (codec->codec_type == CODEC_TYPE_AUDIO)
-       {
-           put_v(bc, codec_get_wav_tag(codec->codec_id));
-       }
-        else
-            put_v(bc, 0);
-
-       if (codec->codec_type == CODEC_TYPE_VIDEO)
-       {
-           nom = codec->frame_rate;
-           denom = codec->frame_rate_base;
-       }
-       else
-       {
-           nom = codec->sample_rate;
-            if(codec->frame_size>0)
-                denom= codec->frame_size;
-            else
-                denom= 1; //unlucky
-       }
-        gcd= ff_gcd(nom, denom);
-        nom   /= gcd;
-        denom /= gcd;
-        nut->stream[i].rate_num= nom;
-        nut->stream[i].rate_den= denom;
-
-       put_v(bc, codec->bit_rate);
-       put_v(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);
-       for(j=0; j<3; j++)
-               put_v(bc, nut->stream[i].initial_pts_predictor[j]);
-       for(j=0; j<2; j++)
-               put_v(bc, nut->stream[i].initial_size_predictor[j]);
-       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 * denom) / nom);
-               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;
-       }
-       put_be32(bc, 0); /* FIXME: checksum */
-        update_packetheader(nut, bc, 0);
-    }
+void ff_nut_add_sp(NUTContext *nut, int64_t pos, int64_t back_ptr, int64_t ts){
+    syncpoint_t *sp= av_mallocz(sizeof(syncpoint_t));
+    struct AVTreeNode *node= av_mallocz(av_tree_node_size);
 
-    /* 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)); 
-    if (s->author[0])
-    {
-        put_v(bc, 9); /* type */
-        put_str(bc, s->author);
+    sp->pos= pos;
+    sp->back_ptr= back_ptr;
+    sp->ts= ts;
+    av_tree_insert(&nut->syncpoints, sp, ff_nut_sp_pos_cmp, &node);
+    if(node){
+        av_free(sp);
+        av_free(node);
     }
-    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 */
-    put_v(bc, 13); /* type */
-    put_str(bc, LIBAVFORMAT_IDENT);
-    
-    put_v(bc, 0); /* eof info */
-
-    put_be32(bc, 0); /* FIXME: checksum */
-    update_packetheader(nut, bc, 0);
-        
-    put_flush_packet(bc);
-    
-    return 0;
-}
-
-static int nut_write_packet(AVFormatContext *s, int stream_index, 
-                           const uint8_t *buf, int size, int64_t pts)
-{
-    NUTContext *nut = s->priv_data;
-    StreamContext *stream= &nut->stream[stream_index];
-    ByteIOContext *bc = &s->pb;
-    int key_frame = 0, full_pts=0;
-    AVCodecContext *enc;
-    int64_t lsb_pts, delta_pts;
-    int frame_type, best_length, frame_code, flags, i, size_mul, size_lsb;
-    const int64_t frame_start= url_ftell(bc);
-
-    if (stream_index > s->nb_streams)
-       return 1;
-        
-    pts= (av_rescale(pts, stream->rate_num, stream->rate_den) + AV_TIME_BASE/2) / AV_TIME_BASE;
-
-    enc = &s->streams[stream_index]->codec;
-    key_frame = enc->coded_frame->key_frame;
-    delta_pts= pts - stream->last_pts;
-    
-    frame_type=0;
-    if(frame_start + size + 20 - FFMAX(nut->last_frame_start[1], nut->last_frame_start[2]) > MAX_TYPE1_DISTANCE)
-        frame_type=1;
-    if(key_frame){
-        if(frame_type==1 && frame_start + size - nut->last_frame_start[2] > MAX_TYPE2_DISTANCE)
-            frame_type=2;
-        if(!stream->last_key_frame)
-            frame_type=2;
-    }
-
-    if(frame_type>0){
-        update_packetheader(nut, bc, 0);
-        reset(s);
-        full_pts=1;
-    }
-    //FIXME ensure that the timestamp can be represented by either delta or lsb or full_pts=1
-
-    lsb_pts = pts & ((1 << stream->msb_timestamp_shift)-1);
-
-    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= stream->last_key_frame;
-        int length=0;
-        size_mul= nut->frame_code[i].size_mul;
-        size_lsb= nut->frame_code[i].size_lsb;
-        flags= nut->frame_code[i].flags;
-
-        if(stream_id_plus1 == 0) length+= get_length(stream_index);
-        else if(stream_id_plus1 - 1 != stream_index)
-            continue;
-        if(flags & FLAG_PRED_KEY_FRAME){
-            if(flags & FLAG_KEY_FRAME)
-                fc_key_frame= !fc_key_frame;
-        }else{
-            fc_key_frame= !!(flags & FLAG_KEY_FRAME);
-        }
-        assert(key_frame==0 || key_frame==1);
-        if(fc_key_frame != key_frame)
-            continue;
-
-        if((!!(flags & FLAG_FRAME_TYPE)) != (frame_type > 0))
-            continue;
-        
-        if(size_mul <= size_lsb){
-            int p= stream->lru_size[size_lsb - size_mul];
-            if(p != size)
-                continue;
-        }else{
-            if(size % size_mul != size_lsb)
-                continue;
-            if(flags & FLAG_DATA_SIZE)
-                length += get_length(size / size_mul);
-            else if(size/size_mul)
-                continue;
-        }
-
-        if(full_pts != ((flags & FLAG_PTS) && (flags & FLAG_FULL_PTS)))
-            continue;
-            
-        if(flags&FLAG_PTS){
-            if(flags&FLAG_FULL_PTS){
-                length += get_length(pts);
-            }else{
-                length += get_length(lsb_pts);
-            }
-        }else{
-            int delta= stream->lru_pts_delta[(flags & 12)>>2];
-            if(delta != pts - stream->last_pts)
-                continue;
-            assert(frame_type == 0);
-        }
-
-        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;
-#if 0
-    best_length /= 7;
-    best_length ++; //frame_code
-    if(frame_type>0){
-        best_length += 4; //packet header
-        if(frame_type>1)
-            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\n", key_frame, frame_type, full_pts ? 2 : ((flags & FLAG_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));
-#endif
-
-    if (frame_type==2)
-       put_be64(bc, KEYFRAME_STARTCODE);
-    put_byte(bc, frame_code);
-
-    if(frame_type>0)
-        put_packetheader(nut, bc, FFMAX(size+20, MAX_TYPE1_DISTANCE));
-    if(nut->frame_code[frame_code].stream_id_plus1 == 0)
-        put_v(bc, stream_index);
-    if (flags & FLAG_PTS){
-        if (flags & FLAG_FULL_PTS)
-            put_v(bc, pts);
-        else
-            put_v(bc, lsb_pts);
-    }
-    if(flags & FLAG_DATA_SIZE)
-        put_v(bc, size / size_mul);
-    if(size > MAX_TYPE1_DISTANCE){
-        assert(frame_type > 0);
-        update_packetheader(nut, bc, size);
-    }
-    
-    put_buffer(bc, buf, 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;
-
-    update_packetheader(nut, bc, 0);
-
-#if 0
-    int i;
-
-    /* WRITE INDEX */
-
-    for (i = 0; s->nb_streams; i++)
-    {
-       put_be64(bc, INDEX_STARTCODE);
-       put_packetheader(nut, bc, 64);
-       put_v(bc, s->streams[i]->id);
-       put_v(bc, ...);
-       put_be32(bc, 0); /* FIXME: checksum */
-        update_packetheader(nut, bc, 0);
-    }
-#endif
-
-    put_flush_packet(bc);
-    
-    av_freep(&nut->stream);
-
-    return 0;
-}
-#endif //CONFIG_ENCODERS
-
-static int nut_probe(AVProbeData *p)
-{
-    int i;
-    uint64_t code;
-
-    code = 0xff;
-    for (i = 0; i < p->buf_size; i++) {
-        int c = p->buf[i];
-        code = (code << 8) | c;
-        if (code == MAIN_STARTCODE)
-            return AVPROBE_SCORE_MAX;
-    }
-    return 0;
-}
-
-static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap)
-{
-    NUTContext *nut = s->priv_data;
-    ByteIOContext *bc = &s->pb;
-    uint64_t tmp;
-    int cur_stream, nb_streams, i, j;
-
-    nut->avf= s;
-    
-    av_set_pts_info(s, 60, 1, AV_TIME_BASE);
-
-    /* main header */
-    tmp = get_be64(bc);
-    if (tmp != MAIN_STARTCODE)
-       av_log(s, AV_LOG_ERROR, "damaged? startcode!=1 (%Ld)\n", tmp);
-    get_packetheader(nut, bc, 8);
-    
-    tmp = get_v(bc);
-    if (tmp != 1)
-       av_log(s, AV_LOG_ERROR, "bad version (%Ld)\n", tmp);
-    
-    nb_streams = get_v(bc);
-    get_v(bc); //checksum threshold
-
-    for(i=0; i<256;){
-        int tmp_flags = get_v(bc);
-        int tmp_stream= get_v(bc);
-        int tmp_mul   = get_v(bc);
-        int tmp_size  = get_v(bc);
-        int count     = 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_flags & FLAG_FRAME_TYPE) && tmp_flags != 1){
-            if(tmp_flags & FLAG_PRED_KEY_FRAME){
-                av_log(s, AV_LOG_ERROR, "keyframe prediction in non 0 frame type\n");
-                return -1;
-            }
-            if(!(tmp_flags & FLAG_PTS) || !(tmp_flags & FLAG_FULL_PTS) ){
-                av_log(s, AV_LOG_ERROR, "no full pts in non 0 frame type\n");
-                return -1;
-            }
-        }
-
-        for(j=0; j<count; j++,i++){
-            if(tmp_stream > nb_streams + 1){
-                av_log(s, AV_LOG_ERROR, "illegal stream number\n");
-                return -1;
-            }
-
-            nut->frame_code[i].flags           = tmp_flags ;
-            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  ;
-            if(++tmp_size >= tmp_mul){
-                tmp_size=0;
-                tmp_stream++;
-            }
-        }
-    }
-    if(nut->frame_code['N'].flags != 1){
-        av_log(s, AV_LOG_ERROR, "illegal frame_code table\n");
-        return -1;
-    }
-    
-    get_be32(bc); /* checkusm */
-    
-    s->bit_rate = 0;
-
-    nut->stream = av_malloc(sizeof(StreamContext)*nb_streams);
-    
-    /* stream header */
-    for (cur_stream = 0; cur_stream < nb_streams; cur_stream++)
-    {
-       int class, nom, denom;
-       AVStream *st;
-       
-       tmp = get_be64(bc);
-       if (tmp != STREAM_STARTCODE)
-           av_log(s, AV_LOG_ERROR, "damaged? startcode!=1 (%Ld)\n", tmp);
-       get_packetheader(nut, bc, 8);
-       st = av_new_stream(s, get_v(bc));
-       if (!st)
-           return AVERROR_NOMEM;
-       class = get_v(bc);
-       tmp = get_v(bc);
-       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 32:
-               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;
-           default:
-               av_log(s, AV_LOG_ERROR, "Unknown stream class (%d)\n", class);
-               return -1;
-       }
-       s->bit_rate += get_v(bc);
-       get_v(bc); /* language code */
-       nom = get_v(bc);
-       denom = get_v(bc);
-       nut->stream[cur_stream].msb_timestamp_shift = get_v(bc);
-       for(i=0; i<3; i++)
-               nut->stream[cur_stream].initial_pts_predictor[i]= get_v(bc);
-       for(i=0; i<2; i++)
-               nut->stream[cur_stream].initial_size_predictor[i]= get_v(bc);
-       get_byte(bc); /* flags */
-
-       /* codec specific data headers */
-       while(get_v(bc) != 0){
-            st->codec.extradata_size= get_v(bc);
-            st->codec.extradata= av_mallocz(st->codec.extradata_size);
-            get_buffer(bc, st->codec.extradata, st->codec.extradata_size);            
-//         url_fskip(bc, get_v(bc));
-        }
-       
-       if (class == 0) /* 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 */
-
-           st->codec.frame_rate = nom;
-           st->codec.frame_rate_base = denom;
-       }
-       if (class == 32) /* AUDIO */
-       {
-           st->codec.sample_rate = (get_v(bc) * nom) / denom;
-           st->codec.channels = get_v(bc);
-       }
-        get_be32(bc); /* checksum */
-        nut->stream[cur_stream].rate_num= nom;
-        nut->stream[cur_stream].rate_den= denom;
-    }
-        
-    tmp = get_be64(bc);
-    if (tmp == INFO_STARTCODE){
-       get_packetheader(nut, bc, 8);
-    
-        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 %d\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")){
-                int value= 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);
-            }
-        }
-        get_be32(bc); /* checksum */
-    }else
-        url_fseek(bc, -8, SEEK_CUR);
-    
-    return 0;
-}
-
-static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
-{
-    NUTContext *nut = s->priv_data;
-    StreamContext *stream;
-    ByteIOContext *bc = &s->pb;
-    int size, frame_code, flags, size_mul, size_lsb, stream_id;
-    int key_frame = 0;
-    int frame_type= 0;
-    int64_t pts = 0;
-    const int64_t frame_start= url_ftell(bc);
-
-    if (url_feof(bc))
-       return -1;
-    
-    frame_code = get_byte(bc);
-    if(frame_code == 'N'){
-        uint64_t tmp= frame_code;
-       tmp<<=8 ; tmp |= get_byte(bc);
-       tmp<<=16; tmp |= get_be16(bc);
-       tmp<<=32; tmp |= get_be32(bc);
-       if (tmp == KEYFRAME_STARTCODE)
-       {
-           frame_code = get_byte(bc);
-            frame_type = 2;
-       }
-       else
-           av_log(s, AV_LOG_ERROR, "error in zero bit / startcode %LX\n", tmp);
-    }
-    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;
-
-    if(flags & FLAG_FRAME_TYPE){
-        reset(s);
-        if(frame_type==2){
-            get_packetheader(nut, bc, 8+1);
-        }else{
-            get_packetheader(nut, bc, 1);
-            frame_type= 1;
-        }
-    }
-
-    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];
-    
-    if(flags & FLAG_PRED_KEY_FRAME){
-        if(flags & FLAG_KEY_FRAME)
-            key_frame= !stream->last_key_frame;
-        else
-            key_frame= stream->last_key_frame;
-    }else{
-        key_frame= !!(flags & FLAG_KEY_FRAME);
-    }
-
-    if(flags & FLAG_PTS){
-        if(flags & FLAG_FULL_PTS){
-            pts= get_v(bc);
-        }else{
-            int64_t mask = (1<<stream->msb_timestamp_shift)-1;
-            int64_t delta= stream->last_pts - mask/2;
-            pts= ((get_v(bc) - delta)&mask) + delta;
-        }
-    }else{
-        pts= stream->last_pts + stream->lru_pts_delta[(flags&12)>>2];
-    }
-  
-    if(size_mul <= size_lsb){
-        size= stream->lru_size[size_lsb - size_mul];
-    }else{
-        if(flags & FLAG_DATA_SIZE)
-            size= size_mul*get_v(bc) + size_lsb;
-        else
-            size= size_lsb;
-    }
-      
-//av_log(s, AV_LOG_DEBUG, "fs:%lld fc:%d ft:%d kf:%d pts:%lld\n", frame_start, frame_code, frame_type, key_frame, pts);
-    
-    av_new_packet(pkt, size);
-    get_buffer(bc, pkt->data, size);
-    pkt->stream_index = stream_id;
-    if (key_frame)
-       pkt->flags |= PKT_FLAG_KEY;
-    pkt->pts = pts * AV_TIME_BASE * stream->rate_den / stream->rate_num;
-
-    update(nut, stream_id, frame_start, frame_type, frame_code, key_frame, size, pts);
-
-    return 0;
-}
-
-static int nut_read_close(AVFormatContext *s)
-{
-    NUTContext *nut = s->priv_data;
-    int i;
-
-    for(i=0;i<s->nb_streams;i++) {
-        av_freep(&s->streams[i]->codec.extradata);
-    }
-    av_freep(&nut->stream);
-
-    return 0;
-}
-
-static AVInputFormat nut_iformat = {
-    "nut",
-    "nut format",
-    sizeof(NUTContext),
-    nut_probe,
-    nut_read_header,
-    nut_read_packet,
-    nut_read_close,
-//    nut_read_seek,
-    .extensions = "nut",
-};
-
-#ifdef CONFIG_ENCODERS
-static AVOutputFormat nut_oformat = {
-    "nut",
-    "nut format",
-    "video/x-nut",
-    "nut",
-    sizeof(NUTContext),
-#ifdef CONFIG_VORBIS
-    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,
-};
-#endif //CONFIG_ENCODERS
-
-int nut_init(void)
-{
-    av_register_input_format(&nut_iformat);
-#ifdef CONFIG_ENCODERS
-    av_register_output_format(&nut_oformat);
-#endif //CONFIG_ENCODERS
-    return 0;
 }