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FFmpeg/libavformat/nut.c

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  1. /*

  2.  * "NUT" Container Format muxer and demuxer (DRAFT-200403??)

  3.  * Copyright (c) 2003 Alex Beregszaszi

  4.  * Copyright (c) 2004 Michael Niedermayer

  5.  *

  6.  * This library is free software; you can redistribute it and/or

  7.  * modify it under the terms of the GNU Lesser General Public

  8.  * License as published by the Free Software Foundation; either

  9.  * version 2 of the License, or (at your option) any later version.

  10.  *

  11.  * This library is distributed in the hope that it will be useful,

  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  14.  * Lesser General Public License for more details.

  15.  *

  16.  * You should have received a copy of the GNU General Public

  17.  * License along with this library; if not, write to the Free Software

  18.  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

  19.  *

  20.  * NUT DRAFT can be found in MPlayer CVS at DOCS/tech/mpcf.txt

  21.  *

  22.  * AND http://people.fsn.hu/~alex/nut/ (TeX, pdf, ps, dvi, ..)

  23.  *

  24.  */

  25. 

  26. /*

  27.  * TODO:

  28.  * - checksumming

  29.  * - seeking

  30.  * - index writing

  31.  * - index packet reading support

  32.  * - startcode searching for broken streams

  33. */

  34. 

  35. //#define DEBUG 1

  36. 

  37. #include <limits.h>

  38. #include "avformat.h"

  39. #include "mpegaudio.h"

  40. #include "avi.h"

  41. 

  42. #undef NDEBUG

  43. #include <assert.h>

  44. 

  45. //from /dev/random

  46. 

  47. #define     MAIN_STARTCODE (0x7A561F5F04ADULL + (((uint64_t)('N'<<8) + 'M')<<48)) 

  48. #define   STREAM_STARTCODE (0x11405BF2F9DBULL + (((uint64_t)('N'<<8) + 'S')<<48)) 

  49. #define KEYFRAME_STARTCODE (0xE4ADEECA4569ULL + (((uint64_t)('N'<<8) + 'K')<<48)) 

  50. #define    INDEX_STARTCODE (0xDD672F23E64EULL + (((uint64_t)('N'<<8) + 'X')<<48)) 

  51. #define     INFO_STARTCODE (0xAB68B596BA78ULL + (((uint64_t)('N'<<8) + 'I')<<48)) 

  52. 

  53. #define MAX_TYPE1_DISTANCE (1024*16-1)

  54. #define MAX_TYPE2_DISTANCE (1024*64-1)

  55. 

  56. #define MAX_SIZE_LRU 2

  57. #define MAX_PTS_LRU 3

  58. 

  59. #define FLAG_FRAME_TYPE      1

  60. #define FLAG_DATA_SIZE       2

  61. #define FLAG_PTS            16

  62. #define FLAG_FULL_PTS        4

  63. #define FLAG_KEY_FRAME      32

  64. #define FLAG_PRED_KEY_FRAME 64

  65. 

  66. typedef struct {

  67.     uint8_t flags;

  68.     uint8_t stream_id_plus1;

  69.     uint8_t size_mul;

  70.     uint8_t size_lsb;

  71. } FrameCode;

  72. 

  73. typedef struct {

  74.     int last_key_frame;

  75.     int msb_timestamp_shift;

  76.     int rate_num;

  77.     int rate_den;

  78.     int64_t last_pts;

  79.     int64_t last_full_pts;

  80.     int lru_pts_delta[MAX_PTS_LRU];

  81.     int lru_size[MAX_SIZE_LRU];

  82.     int initial_pts_predictor[MAX_PTS_LRU];

  83.     int initial_size_predictor[MAX_SIZE_LRU];

  84. } StreamContext;

  85. 

  86. typedef struct {

  87.     AVFormatContext *avf;

  88.     int64_t packet_start;

  89.     int64_t last_packet_start;

  90.     int written_packet_size;

  91.     int64_t packet_size_pos;

  92.     int64_t last_frame_start[3];

  93.     FrameCode frame_code[256];

  94.     StreamContext *stream;

  95. } NUTContext;

  96. 

  97. static char *info_table[][2]={

  98. 	{NULL			,  NULL }, // end

  99. 	{NULL			,  NULL },

  100. 	{NULL			, "UTF8"},

  101. 	{NULL			, "v"},

  102. 	{NULL			, "s"},

  103. 	{"StreamId"		, "v"},

  104. 	{"SegmentId"		, "v"},

  105. 	{"StartTimestamp"	, "v"},

  106. 	{"EndTimestamp"		, "v"},

  107. 	{"Author"		, "UTF8"},

  108. 	{"Titel"		, "UTF8"},

  109. 	{"Description"		, "UTF8"},

  110. 	{"Copyright"		, "UTF8"},

  111. 	{"Encoder"		, "UTF8"},

  112. 	{"Keyword"		, "UTF8"},

  113. 	{"Cover"		, "JPEG"},

  114. 	{"Cover"		, "PNG"},

  115. };

  116. 

  117. static void update_lru(int *lru, int current, int count){

  118.     int i;

  119. 

  120.     for(i=0; i<count-1; i++){

  121.         if(lru[i] == current)

  122.             break;

  123.     }

  124. 

  125.     for(; i; i--){

  126.         lru[i]= lru[i-1];

  127.     }

  128. 

  129.     lru[0]= current;

  130. }

  131. 

  132. 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){

  133.     StreamContext *stream= &nut->stream[stream_index];

  134.     

  135.     stream->last_key_frame= key_frame;

  136.     nut->last_frame_start[ frame_type ]= frame_start;

  137.     update_lru(stream->lru_pts_delta, pts - stream->last_pts, 3);

  138.     update_lru(stream->lru_size     ,                   size, 2);

  139.     stream->last_pts= pts;

  140.     if(    nut->frame_code[frame_code].flags & FLAG_PTS 

  141.         && nut->frame_code[frame_code].flags & FLAG_FULL_PTS)

  142.         stream->last_full_pts= pts;

  143. }

  144. 

  145. static void reset(AVFormatContext *s/*, int frame_type*/){

  146.     NUTContext *nut = s->priv_data;

  147.     int i;

  148.     

  149.     for(i=0; i<s->nb_streams; i++){

  150.         StreamContext *stream= &nut->stream[i];

  151.     

  152.         stream->last_key_frame= 1;

  153.         memcpy(stream->lru_pts_delta, stream->initial_pts_predictor, sizeof(int)*MAX_PTS_LRU);

  154.         memcpy(stream->lru_size, stream->initial_size_predictor, sizeof(int)*MAX_SIZE_LRU);

  155.     }

  156. }

  157. 

  158. static void build_frame_code(AVFormatContext *s){

  159.     NUTContext *nut = s->priv_data;

  160.     int key_frame, frame_type, full_pts, index, pred, stream_id;

  161.     int start=0;

  162.     int end= 255;

  163.     int keyframe_0_esc= s->nb_streams > 2;

  164. 

  165.     if(keyframe_0_esc){

  166.         /* keyframe = 0 escapes, 3 codes */

  167.         for(frame_type=0; frame_type<2; frame_type++){

  168.             for(full_pts=frame_type; full_pts<2; full_pts++){

  169.                 FrameCode *ft= &nut->frame_code[start];

  170.                 ft->flags= FLAG_FRAME_TYPE*frame_type + FLAG_FULL_PTS*full_pts;

  171.                 ft->flags|= FLAG_DATA_SIZE | FLAG_PTS; 

  172.                 ft->stream_id_plus1= 0;

  173.                 ft->size_mul=1;

  174.                 start++;

  175.             }

  176.         }

  177.     }

  178. 

  179.     for(stream_id= 0; stream_id<s->nb_streams; stream_id++){

  180.         int start2= start + (end-start)*stream_id / s->nb_streams;

  181.         int end2  = start + (end-start)*(stream_id+1) / s->nb_streams;

  182.         AVCodecContext *codec = &s->streams[stream_id]->codec;

  183.         int is_audio= codec->codec_type == CODEC_TYPE_AUDIO;

  184.         int intra_only= /*codec->intra_only || */is_audio;

  185.         int pred_count;

  186. 

  187.         for(key_frame=0; key_frame<2; key_frame++){

  188.             if(intra_only && keyframe_0_esc && key_frame==0)

  189.                 continue;

  190.             

  191.             for(frame_type=0; frame_type<2; frame_type++){

  192.                 for(full_pts=frame_type; full_pts<2; full_pts++){

  193.                     FrameCode *ft= &nut->frame_code[start2];

  194.                     ft->flags= FLAG_FRAME_TYPE*frame_type + FLAG_FULL_PTS*full_pts + FLAG_KEY_FRAME*key_frame;

  195.                     ft->flags|= FLAG_DATA_SIZE | FLAG_PTS;

  196.                     ft->stream_id_plus1= stream_id + 1;

  197.                     ft->size_mul=1;

  198.                     start2++;

  199.                 }

  200.             }

  201.         }

  202. 

  203.         key_frame= intra_only;

  204. #if 1

  205.         if(is_audio){

  206.             int frame_bytes= codec->frame_size*(int64_t)codec->bit_rate / (8*codec->sample_rate);

  207.             for(pred=0; pred<MAX_SIZE_LRU; pred++){

  208.                 for(frame_type=0; frame_type<1; frame_type++){

  209.                     FrameCode *ft= &nut->frame_code[start2];

  210.                     ft->flags= FLAG_KEY_FRAME*key_frame + (FLAG_FULL_PTS+FLAG_PTS+FLAG_FRAME_TYPE)*frame_type;

  211.                     ft->stream_id_plus1= stream_id + 1;

  212.                     ft->size_mul=1;

  213.                     ft->size_lsb=1 + pred;

  214.                     start2++;

  215.                 }

  216.                 nut->stream[stream_id].initial_size_predictor[pred]= frame_bytes + pred;

  217.             }

  218.         }else{

  219.             FrameCode *ft= &nut->frame_code[start2];

  220.             ft->flags= FLAG_KEY_FRAME | FLAG_DATA_SIZE;

  221.             ft->stream_id_plus1= stream_id + 1;

  222.             ft->size_mul=1;

  223.             start2++;

  224.         }

  225. #endif

  226.         pred_count= 2 + codec->has_b_frames + (codec->codec_id == CODEC_ID_VORBIS);

  227.         for(pred=0; pred<pred_count; pred++){

  228.             int start3= start2 + (end2-start2)*pred / pred_count;

  229.             int end3  = start2 + (end2-start2)*(pred+1) / pred_count;

  230. 

  231.             for(index=start3; index<end3; index++){

  232.                 FrameCode *ft= &nut->frame_code[index];

  233.                 ft->flags= FLAG_KEY_FRAME*key_frame + pred*4;

  234.                 ft->flags|= FLAG_DATA_SIZE;

  235.                 ft->stream_id_plus1= stream_id + 1;

  236. //FIXME use single byte size and pred from last

  237.                 ft->size_mul= end3-start3;

  238.                 ft->size_lsb= index - start3;

  239.             }

  240.             nut->stream[stream_id].initial_pts_predictor[pred]= pred+1;

  241.         }

  242.     }

  243.     memmove(&nut->frame_code['N'+1], &nut->frame_code['N'], sizeof(FrameCode)*(255-'N'));

  244.     nut->frame_code['N'].flags= 1;

  245. }

  246. 

  247. static int bytes_left(ByteIOContext *bc)

  248. {

  249.     return bc->buf_end - bc->buf_ptr;

  250. }

  251. 

  252. static uint64_t get_v(ByteIOContext *bc)

  253. {

  254.     uint64_t val = 0;

  255. 

  256.     for(; bytes_left(bc) > 0; )

  257.     {

  258. 	int tmp = get_byte(bc);

  259. 

  260. 	if (tmp&0x80)

  261. 	    val= (val<<7) + tmp - 0x80;

  262. 	else

  263. 	    return (val<<7) + tmp;

  264.     }

  265.     return -1;

  266. }

  267. 

  268. static int get_str(ByteIOContext *bc, char *string, int maxlen){

  269.     int len= get_v(bc);

  270.     

  271.     if(len && maxlen)

  272.         get_buffer(bc, string, FFMIN(len, maxlen));

  273.     while(len > maxlen){

  274.         get_byte(bc);

  275.         len--;

  276.     }

  277. 

  278.     if(maxlen)

  279.         string[FFMIN(len, maxlen-1)]= 0;

  280.     

  281.     if(maxlen == len)

  282.         return -1;

  283.     else

  284.         return 0;

  285. }

  286. 

  287. static int get_packetheader(NUTContext *nut, ByteIOContext *bc, int prefix_length)

  288. {

  289.     int64_t start, size, last_size;

  290.     start= url_ftell(bc) - prefix_length;

  291. 

  292.     if(start != nut->packet_start + nut->written_packet_size){

  293.         av_log(nut->avf, AV_LOG_ERROR, "get_packetheader called at weird position\n");

  294.         return -1;

  295.     }

  296. 

  297.     size= get_v(bc);

  298.     last_size= get_v(bc);

  299.     if(nut->written_packet_size != last_size){

  300.         av_log(nut->avf, AV_LOG_ERROR, "packet size missmatch %d != %lld at %lld\n", nut->written_packet_size, last_size, start);

  301.         return -1;

  302.     }

  303. 

  304.     nut->last_packet_start = nut->packet_start;

  305.     nut->packet_start = start;

  306.     nut->written_packet_size= size;

  307. 

  308.     return size;

  309. }

  310. 

  311. /**

  312.  * 

  313.  */

  314. static int get_length(uint64_t val){

  315.     int i;

  316. 

  317.     for (i=7; ; i+=7)

  318. 	if ((val>>i) == 0)

  319. 	    return i;

  320. 

  321.     return 7; //not reached

  322. }

  323. 

  324. #ifdef CONFIG_ENCODERS

  325. static int put_v(ByteIOContext *bc, uint64_t val)

  326. {

  327.     int i;

  328. //    if (bytes_left(s)*8 < 9)

  329. //	return -1;

  330. 

  331.     if (bytes_left(bc) < 1)

  332. 	return -1;

  333. 

  334.     val &= 0x7FFFFFFFFFFFFFFFULL; // FIXME can only encode upto 63 bits currently

  335.     i= get_length(val);

  336. 

  337.     for (i-=7; i>0; i-=7){

  338. 	put_byte(bc, 0x80 | (val>>i));

  339.     }

  340. 

  341.     put_byte(bc, val&0x7f);

  342. 

  343.     return 0;

  344. }

  345. 

  346. static int put_str(ByteIOContext *bc, const char *string){

  347.     int len= strlen(string);

  348.     

  349.     put_v(bc, len);

  350.     put_buffer(bc, string, len);

  351.     

  352.     return 0;

  353. }

  354. 

  355. static int put_packetheader(NUTContext *nut, ByteIOContext *bc, int max_size)

  356. {

  357.     put_flush_packet(bc);

  358.     nut->last_packet_start= nut->packet_start;

  359.     nut->packet_start+= nut->written_packet_size;

  360.     nut->packet_size_pos = url_ftell(bc);

  361.     nut->written_packet_size = max_size;

  362. 

  363.     /* packet header */

  364.     put_v(bc, nut->written_packet_size); /* forward ptr */

  365.     put_v(bc, nut->packet_start - nut->last_packet_start); /* backward ptr */

  366. 

  367.     return 0;

  368. }

  369. 

  370. static int update_packetheader(NUTContext *nut, ByteIOContext *bc, int additional_size){

  371.     int64_t start= nut->packet_start;

  372.     int64_t cur= url_ftell(bc);

  373.     int size= cur - start + additional_size;

  374.     

  375.     if(size != nut->written_packet_size){

  376.         int i;

  377. 

  378.         assert( size <= nut->written_packet_size );

  379.     

  380.         url_fseek(bc, nut->packet_size_pos, SEEK_SET);

  381.         for(i=get_length(size); i < get_length(nut->written_packet_size); i+=7)

  382.             put_byte(bc, 0x80);

  383.         put_v(bc, size);

  384. 

  385.         url_fseek(bc, cur, SEEK_SET);

  386.         nut->written_packet_size= size; //FIXME may fail if multiple updates with differing sizes, as get_length may differ

  387.     }

  388.     

  389.     return 0;

  390. }

  391. 

  392. static int nut_write_header(AVFormatContext *s)

  393. {

  394.     NUTContext *nut = s->priv_data;

  395.     ByteIOContext *bc = &s->pb;

  396.     AVCodecContext *codec;

  397.     int i, j;

  398. 

  399.     nut->avf= s;

  400.     

  401.     nut->stream =	

  402. 	av_mallocz(sizeof(StreamContext)*s->nb_streams);

  403.     

  404.     av_set_pts_info(s, 60, 1, AV_TIME_BASE);

  405.     

  406.     /* main header */

  407.     put_be64(bc, MAIN_STARTCODE);

  408.     put_packetheader(nut, bc, 120+5*256);

  409.     put_v(bc, 1); /* version */

  410.     put_v(bc, s->nb_streams);

  411.     put_v(bc, 3); /* checksum threshold */

  412.     

  413.     build_frame_code(s);

  414.     assert(nut->frame_code['N'].flags == 1);

  415.     for(i=0; i<256;){

  416.         int tmp_flags = nut->frame_code[i].flags;

  417.         int tmp_stream= nut->frame_code[i].stream_id_plus1;

  418.         int tmp_mul   = nut->frame_code[i].size_mul;

  419.         int tmp_size  = nut->frame_code[i].size_lsb;

  420.         put_v(bc, tmp_flags);

  421.         put_v(bc, tmp_stream);

  422.         put_v(bc, tmp_mul);

  423.         put_v(bc, tmp_size);

  424. 

  425.         for(j=0; i<256; j++,i++){

  426.             if(nut->frame_code[i].flags           != tmp_flags ) break;

  427.             if(nut->frame_code[i].stream_id_plus1 != tmp_stream) break;

  428.             if(nut->frame_code[i].size_mul        != tmp_mul   ) break;

  429.             if(nut->frame_code[i].size_lsb        != tmp_size  ) break;

  430.             if(++tmp_size >= tmp_mul){

  431.                 tmp_size=0;

  432.                 tmp_stream++;

  433.             }

  434.         }

  435.         put_v(bc, j);

  436.     }

  437. 

  438.     put_be32(bc, 0); /* FIXME: checksum */

  439.     

  440.     update_packetheader(nut, bc, 0);

  441.     

  442.     /* stream headers */

  443.     for (i = 0; i < s->nb_streams; i++)

  444.     {

  445. 	int nom, denom, gcd;

  446. 

  447. 	codec = &s->streams[i]->codec;

  448. 	

  449. 	put_be64(bc, STREAM_STARTCODE);

  450. 	put_packetheader(nut, bc, 120 + codec->extradata_size);

  451. 	put_v(bc, i /*s->streams[i]->index*/);

  452. 	put_v(bc, (codec->codec_type == CODEC_TYPE_AUDIO) ? 32 : 0);

  453. 	if (codec->codec_tag)

  454. 	    put_v(bc, codec->codec_tag);

  455. 	else if (codec->codec_type == CODEC_TYPE_VIDEO)

  456. 	{

  457. 	    put_v(bc, codec_get_bmp_tag(codec->codec_id));

  458. 	}

  459. 	else if (codec->codec_type == CODEC_TYPE_AUDIO)

  460. 	{

  461. 	    put_v(bc, codec_get_wav_tag(codec->codec_id));

  462. 	}

  463.         else

  464.             put_v(bc, 0);

  465. 

  466. 	if (codec->codec_type == CODEC_TYPE_VIDEO)

  467. 	{

  468. 	    nom = codec->frame_rate;

  469. 	    denom = codec->frame_rate_base;

  470. 	}

  471. 	else

  472. 	{

  473. 	    nom = codec->sample_rate;

  474.             if(codec->frame_size>0)

  475.                 denom= codec->frame_size;

  476.             else

  477.                 denom= 1; //unlucky

  478. 	}

  479.         gcd= ff_gcd(nom, denom);

  480.         nom   /= gcd;

  481.         denom /= gcd;

  482.         nut->stream[i].rate_num= nom;

  483.         nut->stream[i].rate_den= denom;

  484. 

  485. 	put_v(bc, codec->bit_rate);

  486. 	put_v(bc, 0); /* no language code */

  487. 	put_v(bc, nom);

  488. 	put_v(bc, denom);

  489.         if(nom / denom < 1000)

  490. 	    nut->stream[i].msb_timestamp_shift = 7;

  491.         else

  492. 	    nut->stream[i].msb_timestamp_shift = 14;

  493. 	put_v(bc, nut->stream[i].msb_timestamp_shift);

  494. 	for(j=0; j<3; j++)

  495. 		put_v(bc, nut->stream[i].initial_pts_predictor[j]);

  496. 	for(j=0; j<2; j++)

  497. 		put_v(bc, nut->stream[i].initial_size_predictor[j]);

  498. 	put_byte(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */

  499. 	

  500.         if(codec->extradata_size){

  501.             put_v(bc, 1);

  502.             put_v(bc, codec->extradata_size);

  503.             put_buffer(bc, codec->extradata, codec->extradata_size);            

  504.         }

  505. 	put_v(bc, 0); /* end of codec specific headers */

  506. 	

  507. 	switch(codec->codec_type)

  508. 	{

  509. 	    case CODEC_TYPE_AUDIO:

  510. 		put_v(bc, (codec->sample_rate * denom) / nom);

  511. 		put_v(bc, codec->channels);

  512. 		break;

  513. 	    case CODEC_TYPE_VIDEO:

  514. 		put_v(bc, codec->width);

  515. 		put_v(bc, codec->height);

  516. 		put_v(bc, codec->sample_aspect_ratio.num);

  517. 		put_v(bc, codec->sample_aspect_ratio.den);

  518. 		put_v(bc, 0); /* csp type -- unknown */

  519. 		break;

  520.             default:

  521.                 break;

  522. 	}

  523. 	put_be32(bc, 0); /* FIXME: checksum */

  524.         update_packetheader(nut, bc, 0);

  525.     }

  526. 

  527.     /* info header */

  528.     put_be64(bc, INFO_STARTCODE);

  529.     put_packetheader(nut, bc, 30+strlen(s->author)+strlen(s->title)+

  530.         strlen(s->comment)+strlen(s->copyright)+strlen(LIBAVFORMAT_IDENT)); 

  531.     if (s->author[0])

  532.     {

  533.         put_v(bc, 9); /* type */

  534.         put_str(bc, s->author);

  535.     }

  536.     if (s->title[0])

  537.     {

  538.         put_v(bc, 10); /* type */

  539.         put_str(bc, s->title);

  540.     }

  541.     if (s->comment[0])

  542.     {

  543.         put_v(bc, 11); /* type */

  544.         put_str(bc, s->comment);

  545.     }

  546.     if (s->copyright[0])

  547.     {

  548.         put_v(bc, 12); /* type */

  549.         put_str(bc, s->copyright);

  550.     }

  551.     /* encoder */

  552.     put_v(bc, 13); /* type */

  553.     put_str(bc, LIBAVFORMAT_IDENT);

  554.     

  555.     put_v(bc, 0); /* eof info */

  556. 

  557.     put_be32(bc, 0); /* FIXME: checksum */

  558.     update_packetheader(nut, bc, 0);

  559.         

  560.     put_flush_packet(bc);

  561.     

  562.     return 0;

  563. }

  564. 

  565. static int nut_write_packet(AVFormatContext *s, int stream_index, 

  566. 			    const uint8_t *buf, int size, int64_t pts)

  567. {

  568.     NUTContext *nut = s->priv_data;

  569.     StreamContext *stream= &nut->stream[stream_index];

  570.     ByteIOContext *bc = &s->pb;

  571.     int key_frame = 0, full_pts=0;

  572.     AVCodecContext *enc;

  573.     int64_t lsb_pts, delta_pts;

  574.     int frame_type, best_length, frame_code, flags, i, size_mul, size_lsb;

  575.     const int64_t frame_start= url_ftell(bc);

  576. 

  577.     if (stream_index > s->nb_streams)

  578. 	return 1;

  579.         

  580.     pts= (av_rescale(pts, stream->rate_num, stream->rate_den) + AV_TIME_BASE/2) / AV_TIME_BASE;

  581. 

  582.     enc = &s->streams[stream_index]->codec;

  583.     key_frame = enc->coded_frame->key_frame;

  584.     delta_pts= pts - stream->last_pts;

  585.     

  586.     frame_type=0;

  587.     if(frame_start + size + 20 - FFMAX(nut->last_frame_start[1], nut->last_frame_start[2]) > MAX_TYPE1_DISTANCE)

  588.         frame_type=1;

  589.     if(key_frame){

  590.         if(frame_type==1 && frame_start + size - nut->last_frame_start[2] > MAX_TYPE2_DISTANCE)

  591.             frame_type=2;

  592.         if(!stream->last_key_frame)

  593.             frame_type=2;

  594.     }

  595. 

  596.     if(frame_type>0){

  597.         update_packetheader(nut, bc, 0);

  598.         reset(s);

  599.         full_pts=1;

  600.     }

  601.     //FIXME ensure that the timestamp can be represented by either delta or lsb or full_pts=1

  602. 

  603.     lsb_pts = pts & ((1 << stream->msb_timestamp_shift)-1);

  604. 

  605.     best_length=INT_MAX;

  606.     frame_code= -1;

  607.     for(i=0; i<256; i++){

  608.         int stream_id_plus1= nut->frame_code[i].stream_id_plus1;

  609.         int fc_key_frame= stream->last_key_frame;

  610.         int length=0;

  611.         size_mul= nut->frame_code[i].size_mul;

  612.         size_lsb= nut->frame_code[i].size_lsb;

  613.         flags= nut->frame_code[i].flags;

  614. 

  615.         if(stream_id_plus1 == 0) length+= get_length(stream_index);

  616.         else if(stream_id_plus1 - 1 != stream_index)

  617.             continue;

  618.         if(flags & FLAG_PRED_KEY_FRAME){

  619.             if(flags & FLAG_KEY_FRAME)

  620.                 fc_key_frame= !fc_key_frame;

  621.         }else{

  622.             fc_key_frame= !!(flags & FLAG_KEY_FRAME);

  623.         }

  624.         assert(key_frame==0 || key_frame==1);

  625.         if(fc_key_frame != key_frame)

  626.             continue;

  627. 

  628.         if((!!(flags & FLAG_FRAME_TYPE)) != (frame_type > 0))

  629.             continue;

  630.         

  631.         if(size_mul <= size_lsb){

  632.             int p= stream->lru_size[size_lsb - size_mul];

  633.             if(p != size)

  634.                 continue;

  635.         }else{

  636.             if(size % size_mul != size_lsb)

  637.                 continue;

  638.             if(flags & FLAG_DATA_SIZE)

  639.                 length += get_length(size / size_mul);

  640.             else if(size/size_mul)

  641.                 continue;

  642.         }

  643. 

  644.         if(full_pts != ((flags & FLAG_PTS) && (flags & FLAG_FULL_PTS)))

  645.             continue;

  646.             

  647.         if(flags&FLAG_PTS){

  648.             if(flags&FLAG_FULL_PTS){

  649.                 length += get_length(pts);

  650.             }else{

  651.                 length += get_length(lsb_pts);

  652.             }

  653.         }else{

  654.             int delta= stream->lru_pts_delta[(flags & 12)>>2];

  655.             if(delta != pts - stream->last_pts)

  656.                 continue;

  657.             assert(frame_type == 0);

  658.         }

  659. 

  660.         if(length < best_length){

  661.             best_length= length;

  662.             frame_code=i;

  663.         }

  664. //    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);

  665.     }

  666. 

  667.     assert(frame_code != -1);

  668.     flags= nut->frame_code[frame_code].flags;

  669.     size_mul= nut->frame_code[frame_code].size_mul;

  670.     size_lsb= nut->frame_code[frame_code].size_lsb;

  671. #if 0

  672.     best_length /= 7;

  673.     best_length ++; //frame_code

  674.     if(frame_type>0){

  675.         best_length += 4; //packet header

  676.         if(frame_type>1)

  677.             best_length += 8; // startcode

  678.     }

  679.     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));

  680. #endif

  681. 

  682.     if (frame_type==2)

  683. 	put_be64(bc, KEYFRAME_STARTCODE);

  684.     put_byte(bc, frame_code);

  685. 

  686.     if(frame_type>0)

  687.         put_packetheader(nut, bc, FFMAX(size+20, MAX_TYPE1_DISTANCE));

  688.     if(nut->frame_code[frame_code].stream_id_plus1 == 0)

  689.         put_v(bc, stream_index);

  690.     if (flags & FLAG_PTS){

  691.         if (flags & FLAG_FULL_PTS)

  692.             put_v(bc, pts);

  693.         else

  694.             put_v(bc, lsb_pts);

  695.     }

  696.     if(flags & FLAG_DATA_SIZE)

  697.         put_v(bc, size / size_mul);

  698.     if(size > MAX_TYPE1_DISTANCE){

  699.         assert(frame_type > 0);

  700.         update_packetheader(nut, bc, size);

  701.     }

  702.     

  703.     put_buffer(bc, buf, size);

  704. 

  705.     update(nut, stream_index, frame_start, frame_type, frame_code, key_frame, size, pts);

  706.     

  707.     return 0;

  708. }

  709. 

  710. static int nut_write_trailer(AVFormatContext *s)

  711. {

  712.     NUTContext *nut = s->priv_data;

  713.     ByteIOContext *bc = &s->pb;

  714. 

  715.     update_packetheader(nut, bc, 0);

  716. 

  717. #if 0

  718.     int i;

  719. 

  720.     /* WRITE INDEX */

  721. 

  722.     for (i = 0; s->nb_streams; i++)

  723.     {

  724. 	put_be64(bc, INDEX_STARTCODE);

  725. 	put_packetheader(nut, bc, 64);

  726. 	put_v(bc, s->streams[i]->id);

  727. 	put_v(bc, ...);

  728. 	put_be32(bc, 0); /* FIXME: checksum */

  729.         update_packetheader(nut, bc, 0);

  730.     }

  731. #endif

  732. 

  733.     put_flush_packet(bc);

  734.     

  735.     av_freep(&nut->stream);

  736. 

  737.     return 0;

  738. }

  739. #endif //CONFIG_ENCODERS

  740. 

  741. static int nut_probe(AVProbeData *p)

  742. {

  743.     int i;

  744.     uint64_t code;

  745. 

  746.     code = 0xff;

  747.     for (i = 0; i < p->buf_size; i++) {

  748.         int c = p->buf[i];

  749.         code = (code << 8) | c;

  750.         if (code == MAIN_STARTCODE)

  751.             return AVPROBE_SCORE_MAX;

  752.     }

  753.     return 0;

  754. }

  755. 

  756. static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap)

  757. {

  758.     NUTContext *nut = s->priv_data;

  759.     ByteIOContext *bc = &s->pb;

  760.     uint64_t tmp;

  761.     int cur_stream, nb_streams, i, j;

  762. 

  763.     nut->avf= s;

  764.     

  765.     av_set_pts_info(s, 60, 1, AV_TIME_BASE);

  766. 

  767.     /* main header */

  768.     tmp = get_be64(bc);

  769.     if (tmp != MAIN_STARTCODE)

  770. 	av_log(s, AV_LOG_ERROR, "damaged? startcode!=1 (%Ld)\n", tmp);

  771.     get_packetheader(nut, bc, 8);

  772.     

  773.     tmp = get_v(bc);

  774.     if (tmp != 1)

  775. 	av_log(s, AV_LOG_ERROR, "bad version (%Ld)\n", tmp);

  776.     

  777.     nb_streams = get_v(bc);

  778.     get_v(bc); //checksum threshold

  779. 

  780.     for(i=0; i<256;){

  781.         int tmp_flags = get_v(bc);

  782.         int tmp_stream= get_v(bc);

  783.         int tmp_mul   = get_v(bc);

  784.         int tmp_size  = get_v(bc);

  785.         int count     = get_v(bc);

  786. 

  787.         if(count == 0 || i+count > 256){

  788.             av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);

  789.             return -1;

  790.         }

  791. 

  792.         if((tmp_flags & FLAG_FRAME_TYPE) && tmp_flags != 1){

  793.             if(tmp_flags & FLAG_PRED_KEY_FRAME){

  794.                 av_log(s, AV_LOG_ERROR, "keyframe prediction in non 0 frame type\n");

  795.                 return -1;

  796.             }

  797.             if(!(tmp_flags & FLAG_PTS) || !(tmp_flags & FLAG_FULL_PTS) ){

  798.                 av_log(s, AV_LOG_ERROR, "no full pts in non 0 frame type\n");

  799.                 return -1;

  800.             }

  801.         }

  802. 

  803.         for(j=0; j<count; j++,i++){

  804.             if(tmp_stream > nb_streams + 1){

  805.                 av_log(s, AV_LOG_ERROR, "illegal stream number\n");

  806.                 return -1;

  807.             }

  808. 

  809.             nut->frame_code[i].flags           = tmp_flags ;

  810.             nut->frame_code[i].stream_id_plus1 = tmp_stream;

  811.             nut->frame_code[i].size_mul        = tmp_mul   ;

  812.             nut->frame_code[i].size_lsb        = tmp_size  ;

  813.             if(++tmp_size >= tmp_mul){

  814.                 tmp_size=0;

  815.                 tmp_stream++;

  816.             }

  817.         }

  818.     }

  819.     if(nut->frame_code['N'].flags != 1){

  820.         av_log(s, AV_LOG_ERROR, "illegal frame_code table\n");

  821.         return -1;

  822.     }

  823.     

  824.     get_be32(bc); /* checkusm */

  825.     

  826.     s->bit_rate = 0;

  827. 

  828.     nut->stream = av_malloc(sizeof(StreamContext)*nb_streams);

  829.     

  830.     /* stream header */

  831.     for (cur_stream = 0; cur_stream < nb_streams; cur_stream++)

  832.     {

  833. 	int class, nom, denom;

  834. 	AVStream *st;

  835. 	

  836. 	tmp = get_be64(bc);

  837. 	if (tmp != STREAM_STARTCODE)

  838. 	    av_log(s, AV_LOG_ERROR, "damaged? startcode!=1 (%Ld)\n", tmp);

  839. 	get_packetheader(nut, bc, 8);

  840. 	st = av_new_stream(s, get_v(bc));

  841. 	if (!st)

  842. 	    return AVERROR_NOMEM;

  843. 	class = get_v(bc);

  844. 	tmp = get_v(bc);

  845. 	switch(class)

  846. 	{

  847. 	    case 0:

  848. 		st->codec.codec_type = CODEC_TYPE_VIDEO;

  849. 		st->codec.codec_id = codec_get_bmp_id(tmp);

  850. 		if (st->codec.codec_id == CODEC_ID_NONE)

  851. 		    av_log(s, AV_LOG_ERROR, "Unknown codec?!\n");

  852. 		break;

  853. 	    case 32:

  854. 		st->codec.codec_type = CODEC_TYPE_AUDIO;

  855. 		st->codec.codec_id = codec_get_wav_id(tmp);

  856. 		if (st->codec.codec_id == CODEC_ID_NONE)

  857. 		    av_log(s, AV_LOG_ERROR, "Unknown codec?!\n");

  858. 		break;

  859. 	    default:

  860. 		av_log(s, AV_LOG_ERROR, "Unknown stream class (%d)\n", class);

  861. 		return -1;

  862. 	}

  863. 	s->bit_rate += get_v(bc);

  864. 	get_v(bc); /* language code */

  865. 	nom = get_v(bc);

  866. 	denom = get_v(bc);

  867. 	nut->stream[cur_stream].msb_timestamp_shift = get_v(bc);

  868. 	for(i=0; i<3; i++)

  869. 		nut->stream[cur_stream].initial_pts_predictor[i]= get_v(bc);

  870. 	for(i=0; i<2; i++)

  871. 		nut->stream[cur_stream].initial_size_predictor[i]= get_v(bc);

  872. 	get_byte(bc); /* flags */

  873. 

  874. 	/* codec specific data headers */

  875. 	while(get_v(bc) != 0){

  876.             st->codec.extradata_size= get_v(bc);

  877.             st->codec.extradata= av_mallocz(st->codec.extradata_size);

  878.             get_buffer(bc, st->codec.extradata, st->codec.extradata_size);            

  879. //	    url_fskip(bc, get_v(bc));

  880.         }

  881. 	

  882. 	if (class == 0) /* VIDEO */

  883. 	{

  884. 	    st->codec.width = get_v(bc);

  885. 	    st->codec.height = get_v(bc);

  886. 	    st->codec.sample_aspect_ratio.num= get_v(bc);

  887. 	    st->codec.sample_aspect_ratio.den= get_v(bc);

  888. 	    get_v(bc); /* csp type */

  889. 

  890. 	    st->codec.frame_rate = nom;

  891. 	    st->codec.frame_rate_base = denom;

  892. 	}

  893. 	if (class == 32) /* AUDIO */

  894. 	{

  895. 	    st->codec.sample_rate = (get_v(bc) * nom) / denom;

  896. 	    st->codec.channels = get_v(bc);

  897. 	}

  898.         get_be32(bc); /* checksum */

  899.         nut->stream[cur_stream].rate_num= nom;

  900.         nut->stream[cur_stream].rate_den= denom;

  901.     }

  902.         

  903.     tmp = get_be64(bc);

  904.     if (tmp == INFO_STARTCODE){

  905. 	get_packetheader(nut, bc, 8);

  906.     

  907.         for(;;){

  908.             int id= get_v(bc);

  909.             char *name, *type, custom_name[256], custom_type[256];

  910. 

  911.             if(!id)

  912.                 break;

  913.             else if(id >= sizeof(info_table)/sizeof(info_table[0])){

  914.                 av_log(s, AV_LOG_ERROR, "info id is too large %d %d\n", id, sizeof(info_table)/sizeof(info_table[0]));

  915.                 return -1;

  916.             }

  917. 

  918.             type= info_table[id][1];

  919.             name= info_table[id][0];

  920. //av_log(s, AV_LOG_DEBUG, "%d %s %s\n", id, type, name);

  921. 

  922.             if(!type){

  923.                 get_str(bc, custom_type, sizeof(custom_type));

  924.                 type= custom_type;

  925.             }

  926.             if(!name){

  927.                 get_str(bc, custom_name, sizeof(custom_name));

  928.                 name= custom_name;

  929.             }

  930.             

  931.             if(!strcmp(type, "v")){

  932.                 int value= get_v(bc);

  933.             }else{

  934.                 if(!strcmp(name, "Author"))

  935.                     get_str(bc, s->author, sizeof(s->author));

  936.                 else if(!strcmp(name, "Title"))

  937.                     get_str(bc, s->title, sizeof(s->title));

  938.                 else if(!strcmp(name, "Copyright"))

  939.                     get_str(bc, s->copyright, sizeof(s->copyright));

  940.                 else if(!strcmp(name, "Description"))

  941.                     get_str(bc, s->comment, sizeof(s->comment));

  942.                 else

  943.                     get_str(bc, NULL, 0);

  944.             }

  945.         }

  946.         get_be32(bc); /* checksum */

  947.     }else

  948.         url_fseek(bc, -8, SEEK_CUR);

  949.     

  950.     return 0;

  951. }

  952. 

  953. static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)

  954. {

  955.     NUTContext *nut = s->priv_data;

  956.     StreamContext *stream;

  957.     ByteIOContext *bc = &s->pb;

  958.     int size, frame_code, flags, size_mul, size_lsb, stream_id;

  959.     int key_frame = 0;

  960.     int frame_type= 0;

  961.     int64_t pts = 0;

  962.     const int64_t frame_start= url_ftell(bc);

  963. 

  964.     if (url_feof(bc))

  965. 	return -1;

  966.     

  967.     frame_code = get_byte(bc);

  968.     if(frame_code == 'N'){

  969.         uint64_t tmp= frame_code;

  970. 	tmp<<=8 ; tmp |= get_byte(bc);

  971. 	tmp<<=16; tmp |= get_be16(bc);

  972. 	tmp<<=32; tmp |= get_be32(bc);

  973. 	if (tmp == KEYFRAME_STARTCODE)

  974. 	{

  975. 	    frame_code = get_byte(bc);

  976.             frame_type = 2;

  977. 	}

  978. 	else

  979. 	    av_log(s, AV_LOG_ERROR, "error in zero bit / startcode %LX\n", tmp);

  980.     }

  981.     flags= nut->frame_code[frame_code].flags;

  982.     size_mul= nut->frame_code[frame_code].size_mul;

  983.     size_lsb= nut->frame_code[frame_code].size_lsb;

  984.     stream_id= nut->frame_code[frame_code].stream_id_plus1 - 1;

  985. 

  986.     if(flags & FLAG_FRAME_TYPE){

  987.         reset(s);

  988.         if(frame_type==2){

  989.             get_packetheader(nut, bc, 8+1);

  990.         }else{

  991.             get_packetheader(nut, bc, 1);

  992.             frame_type= 1;

  993.         }

  994.     }

  995. 

  996.     if(stream_id==-1)

  997.         stream_id= get_v(bc);

  998.     if(stream_id >= s->nb_streams){

  999.         av_log(s, AV_LOG_ERROR, "illegal stream_id\n");

  1000.         return -1;

  1001.     }

  1002.     stream= &nut->stream[stream_id];

  1003.     

  1004.     if(flags & FLAG_PRED_KEY_FRAME){

  1005.         if(flags & FLAG_KEY_FRAME)

  1006.             key_frame= !stream->last_key_frame;

  1007.         else

  1008.             key_frame= stream->last_key_frame;

  1009.     }else{

  1010.         key_frame= !!(flags & FLAG_KEY_FRAME);

  1011.     }

  1012. 

  1013.     if(flags & FLAG_PTS){

  1014.         if(flags & FLAG_FULL_PTS){

  1015.             pts= get_v(bc);

  1016.         }else{

  1017.             int64_t mask = (1<<stream->msb_timestamp_shift)-1;

  1018.             int64_t delta= stream->last_pts - mask/2;

  1019.             pts= ((get_v(bc) - delta)&mask) + delta;

  1020.         }

  1021.     }else{

  1022.         pts= stream->last_pts + stream->lru_pts_delta[(flags&12)>>2];

  1023.     }

  1024.   

  1025.     if(size_mul <= size_lsb){

  1026.         size= stream->lru_size[size_lsb - size_mul];

  1027.     }else{

  1028.         if(flags & FLAG_DATA_SIZE)

  1029.             size= size_mul*get_v(bc) + size_lsb;

  1030.         else

  1031.             size= size_lsb;

  1032.     }

  1033.       

  1034. //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);

  1035.     

  1036.     av_new_packet(pkt, size);

  1037.     get_buffer(bc, pkt->data, size);

  1038.     pkt->stream_index = stream_id;

  1039.     if (key_frame)

  1040. 	pkt->flags |= PKT_FLAG_KEY;

  1041.     pkt->pts = pts * AV_TIME_BASE * stream->rate_den / stream->rate_num;

  1042. 

  1043.     update(nut, stream_id, frame_start, frame_type, frame_code, key_frame, size, pts);

  1044. 

  1045.     return 0;

  1046. }

  1047. 

  1048. static int nut_read_close(AVFormatContext *s)

  1049. {

  1050.     NUTContext *nut = s->priv_data;

  1051.     int i;

  1052. 

  1053.     for(i=0;i<s->nb_streams;i++) {

  1054.         av_freep(&s->streams[i]->codec.extradata);

  1055.     }

  1056.     av_freep(&nut->stream);

  1057. 

  1058.     return 0;

  1059. }

  1060. 

  1061. static AVInputFormat nut_iformat = {

  1062.     "nut",

  1063.     "nut format",

  1064.     sizeof(NUTContext),

  1065.     nut_probe,

  1066.     nut_read_header,

  1067.     nut_read_packet,

  1068.     nut_read_close,

  1069. //    nut_read_seek,

  1070.     .extensions = "nut",

  1071. };

  1072. 

  1073. #ifdef CONFIG_ENCODERS

  1074. static AVOutputFormat nut_oformat = {

  1075.     "nut",

  1076.     "nut format",

  1077.     "video/x-nut",

  1078.     "nut",

  1079.     sizeof(NUTContext),

  1080. #ifdef CONFIG_VORBIS

  1081.     CODEC_ID_VORBIS,

  1082. #elif defined(CONFIG_MP3LAME)

  1083.     CODEC_ID_MP3,

  1084. #else

  1085.     CODEC_ID_MP2, /* AC3 needs liba52 decoder */

  1086. #endif

  1087.     CODEC_ID_MPEG4,

  1088.     nut_write_header,

  1089.     nut_write_packet,

  1090.     nut_write_trailer,

  1091. };

  1092. #endif //CONFIG_ENCODERS

  1093. 

  1094. int nut_init(void)

  1095. {

  1096.     av_register_input_format(&nut_iformat);

  1097. #ifdef CONFIG_ENCODERS

  1098.     av_register_output_format(&nut_oformat);

  1099. #endif //CONFIG_ENCODERS

  1100.     return 0;

  1101. }