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FFmpeg/libavformat/asf.c

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  1. /*

  2.  * ASF compatible encoder and decoder.

  3.  * Copyright (c) 2000, 2001 Fabrice Bellard.

  4.  *

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

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

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

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

  9.  *

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

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

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

  13.  * Lesser General Public License for more details.

  14.  *

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

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

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

  18.  */

  19. #include "avformat.h"

  20. #include "avi.h"

  21. #include "mpegaudio.h"

  22. 

  23. #define PACKET_SIZE 3200

  24. #define PACKET_HEADER_SIZE 12

  25. #define FRAME_HEADER_SIZE 17

  26. 

  27. typedef struct {

  28.     int num;

  29.     int seq;

  30.     /* use for reading */

  31.     AVPacket pkt;

  32.     int frag_offset;

  33.     int timestamp;

  34.     int64_t duration;

  35. 

  36.     int ds_span;		/* descrambling  */

  37.     int ds_packet_size;

  38.     int ds_chunk_size;

  39.     int ds_data_size;

  40.     int ds_silence_data;

  41. 

  42. } ASFStream;

  43. 

  44. typedef struct {

  45.     uint32_t v1;

  46.     uint16_t v2;

  47.     uint16_t v3;

  48.     uint8_t v4[8];

  49. } GUID;

  50. 

  51. typedef struct {

  52.     GUID guid;			// generated by client computer

  53.     uint64_t file_size;		// in bytes

  54.                                 // invalid if broadcasting

  55.     uint64_t create_time;	// time of creation, in 100-nanosecond units since 1.1.1601

  56.                                 // invalid if broadcasting

  57.     uint64_t packets_count;	// how many packets are there in the file

  58.                                 // invalid if broadcasting

  59.     uint64_t play_time;		// play time, in 100-nanosecond units

  60.                                 // invalid if broadcasting

  61.     uint64_t send_time;		// time to send file, in 100-nanosecond units

  62.                                 // invalid if broadcasting (could be ignored)

  63.     uint32_t preroll;		// timestamp of the first packet, in milliseconds

  64.     				// if nonzero - substract from time

  65.     uint32_t ignore;            // preroll is 64bit - but let's just ignore it

  66.     uint32_t flags;		// 0x01 - broadcast

  67.     				// 0x02 - seekable

  68.                                 // rest is reserved should be 0

  69.     uint32_t min_pktsize;	// size of a data packet

  70.                                 // invalid if broadcasting

  71.     uint32_t max_pktsize;	// shall be the same as for min_pktsize

  72.                                 // invalid if broadcasting

  73.     uint32_t max_bitrate;	// bandwith of stream in bps

  74.     				// should be the sum of bitrates of the

  75.                                 // individual media streams

  76. } ASFMainHeader;

  77. 

  78. 

  79. typedef struct {

  80.     int seqno;

  81.     int packet_size;

  82.     int is_streamed;

  83.     int asfid2avid[128];        /* conversion table from asf ID 2 AVStream ID */

  84.     ASFStream streams[128];	/* it's max number and it's not that big */

  85.     /* non streamed additonnal info */

  86.     int64_t nb_packets;

  87.     int64_t duration; /* in 100ns units */

  88.     /* packet filling */

  89.     int packet_size_left;

  90.     int packet_timestamp_start;

  91.     int packet_timestamp_end;

  92.     int packet_nb_frames;

  93.     uint8_t packet_buf[PACKET_SIZE];

  94.     ByteIOContext pb;

  95.     /* only for reading */

  96.     uint64_t data_offset; /* begining of the first data packet */

  97. 

  98.     ASFMainHeader hdr;

  99. 

  100.     int packet_flags;

  101.     int packet_property;

  102.     int packet_timestamp;

  103.     int packet_segsizetype;

  104.     int packet_segments;

  105.     int packet_seq;

  106.     int packet_replic_size;

  107.     int packet_key_frame;

  108.     int packet_padsize;

  109.     int packet_frag_offset;

  110.     int packet_frag_size;

  111.     int packet_frag_timestamp;

  112.     int packet_multi_size;

  113.     int packet_obj_size;

  114.     int packet_time_delta;

  115.     int packet_time_start;

  116. 

  117.     int stream_index;

  118.     ASFStream* asf_st; /* currently decoded stream */

  119. } ASFContext;

  120. 

  121. static const GUID asf_header = {

  122.     0x75B22630, 0x668E, 0x11CF, { 0xA6, 0xD9, 0x00, 0xAA, 0x00, 0x62, 0xCE, 0x6C },

  123. };

  124. 

  125. static const GUID file_header = {

  126.     0x8CABDCA1, 0xA947, 0x11CF, { 0x8E, 0xE4, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 },

  127. };

  128. 

  129. static const GUID stream_header = {

  130.     0xB7DC0791, 0xA9B7, 0x11CF, { 0x8E, 0xE6, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 },

  131. };

  132. 

  133. static const GUID audio_stream = {

  134.     0xF8699E40, 0x5B4D, 0x11CF, { 0xA8, 0xFD, 0x00, 0x80, 0x5F, 0x5C, 0x44, 0x2B },

  135. };

  136. 

  137. static const GUID audio_conceal_none = {

  138.     // 0x49f1a440, 0x4ece, 0x11d0, { 0xa3, 0xac, 0x00, 0xa0, 0xc9, 0x03, 0x48, 0xf6 },

  139.     // New value lifted from avifile

  140.     0x20fb5700, 0x5b55, 0x11cf, { 0xa8, 0xfd, 0x00, 0x80, 0x5f, 0x5c, 0x44, 0x2b },

  141. };

  142. 

  143. static const GUID video_stream = {

  144.     0xBC19EFC0, 0x5B4D, 0x11CF, { 0xA8, 0xFD, 0x00, 0x80, 0x5F, 0x5C, 0x44, 0x2B },

  145. };

  146. 

  147. static const GUID video_conceal_none = {

  148.     0x20FB5700, 0x5B55, 0x11CF, { 0xA8, 0xFD, 0x00, 0x80, 0x5F, 0x5C, 0x44, 0x2B },

  149. };

  150. 

  151. 

  152. static const GUID comment_header = {

  153.     0x75b22633, 0x668e, 0x11cf, { 0xa6, 0xd9, 0x00, 0xaa, 0x00, 0x62, 0xce, 0x6c },

  154. };

  155. 

  156. static const GUID codec_comment_header = {

  157.     0x86D15240, 0x311D, 0x11D0, { 0xA3, 0xA4, 0x00, 0xA0, 0xC9, 0x03, 0x48, 0xF6 },

  158. };

  159. static const GUID codec_comment1_header = {

  160.     0x86d15241, 0x311d, 0x11d0, { 0xa3, 0xa4, 0x00, 0xa0, 0xc9, 0x03, 0x48, 0xf6 },

  161. };

  162. 

  163. static const GUID data_header = {

  164.     0x75b22636, 0x668e, 0x11cf, { 0xa6, 0xd9, 0x00, 0xaa, 0x00, 0x62, 0xce, 0x6c },

  165. };

  166. 

  167. static const GUID index_guid = {

  168.     0x33000890, 0xe5b1, 0x11cf, { 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb },

  169. };

  170. 

  171. static const GUID head1_guid = {

  172.     0x5fbf03b5, 0xa92e, 0x11cf, { 0x8e, 0xe3, 0x00, 0xc0, 0x0c, 0x20, 0x53, 0x65 },

  173. };

  174. 

  175. static const GUID head2_guid = {

  176.     0xabd3d211, 0xa9ba, 0x11cf, { 0x8e, 0xe6, 0x00, 0xc0, 0x0c, 0x20, 0x53, 0x65 },

  177. };

  178. 

  179. /* I am not a number !!! This GUID is the one found on the PC used to

  180.    generate the stream */

  181. static const GUID my_guid = {

  182.     0, 0, 0, { 0, 0, 0, 0, 0, 0, 0, 0 },

  183. };

  184. 

  185. static void put_guid(ByteIOContext *s, const GUID *g)

  186. {

  187.     int i;

  188. 

  189.     put_le32(s, g->v1);

  190.     put_le16(s, g->v2);

  191.     put_le16(s, g->v3);

  192.     for(i=0;i<8;i++)

  193.         put_byte(s, g->v4[i]);

  194. }

  195. 

  196. static void put_str16(ByteIOContext *s, const char *tag)

  197. {

  198.     int c;

  199. 

  200.     put_le16(s,strlen(tag) + 1);

  201.     for(;;) {

  202.         c = (uint8_t)*tag++;

  203.         put_le16(s, c);

  204.         if (c == '\0')

  205.             break;

  206.     }

  207. }

  208. 

  209. static void put_str16_nolen(ByteIOContext *s, const char *tag)

  210. {

  211.     int c;

  212. 

  213.     for(;;) {

  214.         c = (uint8_t)*tag++;

  215.         put_le16(s, c);

  216.         if (c == '\0')

  217.             break;

  218.     }

  219. }

  220. 

  221. static int64_t put_header(ByteIOContext *pb, const GUID *g)

  222. {

  223.     int64_t pos;

  224. 

  225.     pos = url_ftell(pb);

  226.     put_guid(pb, g);

  227.     put_le64(pb, 24);

  228.     return pos;

  229. }

  230. 

  231. /* update header size */

  232. static void end_header(ByteIOContext *pb, int64_t pos)

  233. {

  234.     int64_t pos1;

  235. 

  236.     pos1 = url_ftell(pb);

  237.     url_fseek(pb, pos + 16, SEEK_SET);

  238.     put_le64(pb, pos1 - pos);

  239.     url_fseek(pb, pos1, SEEK_SET);

  240. }

  241. 

  242. /* write an asf chunk (only used in streaming case) */

  243. static void put_chunk(AVFormatContext *s, int type, int payload_length, int flags)

  244. {

  245.     ASFContext *asf = s->priv_data;

  246.     ByteIOContext *pb = &s->pb;

  247.     int length;

  248. 

  249.     length = payload_length + 8;

  250.     put_le16(pb, type);

  251.     put_le16(pb, length);

  252.     put_le32(pb, asf->seqno);

  253.     put_le16(pb, flags); /* unknown bytes */

  254.     put_le16(pb, length);

  255.     asf->seqno++;

  256. }

  257. 

  258. /* convert from unix to windows time */

  259. static int64_t unix_to_file_time(int ti)

  260. {

  261.     int64_t t;

  262. 

  263.     t = ti * int64_t_C(10000000);

  264.     t += int64_t_C(116444736000000000);

  265.     return t;

  266. }

  267. 

  268. /* write the header (used two times if non streamed) */

  269. static int asf_write_header1(AVFormatContext *s, int64_t file_size, int64_t data_chunk_size)

  270. {

  271.     ASFContext *asf = s->priv_data;

  272.     ByteIOContext *pb = &s->pb;

  273.     int header_size, n, extra_size, extra_size2, wav_extra_size, file_time;

  274.     int has_title;

  275.     AVCodecContext *enc;

  276.     int64_t header_offset, cur_pos, hpos;

  277.     int bit_rate;

  278. 

  279.     has_title = (s->title[0] || s->author[0] || s->copyright[0] || s->comment[0]);

  280. 

  281.     bit_rate = 0;

  282.     for(n=0;n<s->nb_streams;n++) {

  283.         enc = &s->streams[n]->codec;

  284. 

  285.         bit_rate += enc->bit_rate;

  286.     }

  287. 

  288.     if (asf->is_streamed) {

  289.         put_chunk(s, 0x4824, 0, 0xc00); /* start of stream (length will be patched later) */

  290.     }

  291. 

  292.     put_guid(pb, &asf_header);

  293.     put_le64(pb, -1); /* header length, will be patched after */

  294.     put_le32(pb, 3 + has_title + s->nb_streams); /* number of chunks in header */

  295.     put_byte(pb, 1); /* ??? */

  296.     put_byte(pb, 2); /* ??? */

  297. 

  298.     /* file header */

  299.     header_offset = url_ftell(pb);

  300.     hpos = put_header(pb, &file_header);

  301.     put_guid(pb, &my_guid);

  302.     put_le64(pb, file_size);

  303.     file_time = 0;

  304.     put_le64(pb, unix_to_file_time(file_time));

  305.     put_le64(pb, asf->nb_packets); /* number of packets */

  306.     put_le64(pb, asf->duration); /* end time stamp (in 100ns units) */

  307.     put_le64(pb, asf->duration); /* duration (in 100ns units) */

  308.     put_le32(pb, 0); /* start time stamp */

  309.     put_le32(pb, 0); /* ??? */

  310.     put_le32(pb, asf->is_streamed ? 1 : 0); /* ??? */

  311.     put_le32(pb, asf->packet_size); /* packet size */

  312.     put_le32(pb, asf->packet_size); /* packet size */

  313.     put_le32(pb, bit_rate); /* Nominal data rate in bps */

  314.     end_header(pb, hpos);

  315. 

  316.     /* unknown headers */

  317.     hpos = put_header(pb, &head1_guid);

  318.     put_guid(pb, &head2_guid);

  319.     put_le32(pb, 6);

  320.     put_le16(pb, 0);

  321.     end_header(pb, hpos);

  322. 

  323.     /* title and other infos */

  324.     if (has_title) {

  325.         hpos = put_header(pb, &comment_header);

  326.         put_le16(pb, 2 * (strlen(s->title) + 1));

  327.         put_le16(pb, 2 * (strlen(s->author) + 1));

  328.         put_le16(pb, 2 * (strlen(s->copyright) + 1));

  329.         put_le16(pb, 2 * (strlen(s->comment) + 1));

  330.         put_le16(pb, 0);

  331.         put_str16_nolen(pb, s->title);

  332.         put_str16_nolen(pb, s->author);

  333.         put_str16_nolen(pb, s->copyright);

  334.         put_str16_nolen(pb, s->comment);

  335.         end_header(pb, hpos);

  336.     }

  337. 

  338.     /* stream headers */

  339.     for(n=0;n<s->nb_streams;n++) {

  340.         int64_t es_pos;

  341.         //        ASFStream *stream = &asf->streams[n];

  342. 

  343.         enc = &s->streams[n]->codec;

  344.         asf->streams[n].num = n + 1;

  345.         asf->streams[n].seq = 0;

  346. 

  347.         switch(enc->codec_type) {

  348.         case CODEC_TYPE_AUDIO:

  349.             wav_extra_size = 0;

  350.             extra_size = 18 + wav_extra_size;

  351.             extra_size2 = 0;

  352.             break;

  353.         default:

  354.         case CODEC_TYPE_VIDEO:

  355.             wav_extra_size = 0;

  356.             extra_size = 0x33;

  357.             extra_size2 = 0;

  358.             break;

  359.         }

  360. 

  361.         hpos = put_header(pb, &stream_header);

  362.         if (enc->codec_type == CODEC_TYPE_AUDIO) {

  363.             put_guid(pb, &audio_stream);

  364.             put_guid(pb, &audio_conceal_none);

  365.         } else {

  366.             put_guid(pb, &video_stream);

  367.             put_guid(pb, &video_conceal_none);

  368.         }

  369.         put_le64(pb, 0); /* ??? */

  370.         es_pos = url_ftell(pb);

  371.         put_le32(pb, extra_size); /* wav header len */

  372.         put_le32(pb, extra_size2); /* additional data len */

  373.         put_le16(pb, n + 1); /* stream number */

  374.         put_le32(pb, 0); /* ??? */

  375. 

  376.         if (enc->codec_type == CODEC_TYPE_AUDIO) {

  377.             /* WAVEFORMATEX header */

  378.             int wavsize = put_wav_header(pb, enc);

  379. 

  380.             if (wavsize < 0)

  381.                 return -1;

  382.             if (wavsize != extra_size) {

  383.                 cur_pos = url_ftell(pb);

  384.                 url_fseek(pb, es_pos, SEEK_SET);

  385.                 put_le32(pb, wavsize); /* wav header len */

  386.                 url_fseek(pb, cur_pos, SEEK_SET);

  387.             }

  388.         } else {

  389.             put_le32(pb, enc->width);

  390.             put_le32(pb, enc->height);

  391.             put_byte(pb, 2); /* ??? */

  392.             put_le16(pb, 40); /* size */

  393. 

  394.             /* BITMAPINFOHEADER header */

  395.             put_bmp_header(pb, enc, codec_bmp_tags, 1);

  396.         }

  397.         end_header(pb, hpos);

  398.     }

  399. 

  400.     /* media comments */

  401. 

  402.     hpos = put_header(pb, &codec_comment_header);

  403.     put_guid(pb, &codec_comment1_header);

  404.     put_le32(pb, s->nb_streams);

  405.     for(n=0;n<s->nb_streams;n++) {

  406.         AVCodec *p;

  407. 

  408.         enc = &s->streams[n]->codec;

  409.         p = avcodec_find_encoder(enc->codec_id);

  410. 

  411.         put_le16(pb, asf->streams[n].num);

  412.         put_str16(pb, p ? p->name : enc->codec_name);

  413.         put_le16(pb, 0); /* no parameters */

  414.         

  415.         

  416.         /* id */

  417.         if (enc->codec_type == CODEC_TYPE_AUDIO) {

  418.             put_le16(pb, 2);

  419.             if(!enc->codec_tag)

  420.                 enc->codec_tag = codec_get_tag(codec_wav_tags, enc->codec_id);

  421.             if(!enc->codec_tag)

  422.                 return -1;

  423.             put_le16(pb, enc->codec_tag);

  424.         } else {

  425.             put_le16(pb, 4);

  426.             if(!enc->codec_tag)

  427.                 enc->codec_tag = codec_get_tag(codec_bmp_tags, enc->codec_id);

  428.             if(!enc->codec_tag)

  429.                 return -1;

  430.             put_le32(pb, enc->codec_tag);

  431.         }

  432.     }

  433.     end_header(pb, hpos);

  434. 

  435.     /* patch the header size fields */

  436. 

  437.     cur_pos = url_ftell(pb);

  438.     header_size = cur_pos - header_offset;

  439.     if (asf->is_streamed) {

  440.         header_size += 8 + 30 + 50;

  441. 

  442.         url_fseek(pb, header_offset - 10 - 30, SEEK_SET);

  443.         put_le16(pb, header_size);

  444.         url_fseek(pb, header_offset - 2 - 30, SEEK_SET);

  445.         put_le16(pb, header_size);

  446. 

  447.         header_size -= 8 + 30 + 50;

  448.     }

  449.     header_size += 24 + 6;

  450.     url_fseek(pb, header_offset - 14, SEEK_SET);

  451.     put_le64(pb, header_size);

  452.     url_fseek(pb, cur_pos, SEEK_SET);

  453. 

  454.     /* movie chunk, followed by packets of packet_size */

  455.     asf->data_offset = cur_pos;

  456.     put_guid(pb, &data_header);

  457.     put_le64(pb, data_chunk_size);

  458.     put_guid(pb, &my_guid);

  459.     put_le64(pb, asf->nb_packets); /* nb packets */

  460.     put_byte(pb, 1); /* ??? */

  461.     put_byte(pb, 1); /* ??? */

  462.     return 0;

  463. }

  464. 

  465. static int asf_write_header(AVFormatContext *s)

  466. {

  467.     ASFContext *asf = s->priv_data;

  468. 

  469.     av_set_pts_info(s, 32, 1, 1000); /* 32 bit pts in ms */

  470. 

  471.     asf->packet_size = PACKET_SIZE;

  472.     asf->nb_packets = 0;

  473. 

  474.     if (asf_write_header1(s, 0, 50) < 0) {

  475.         //av_free(asf);

  476.         return -1;

  477.     }

  478. 

  479.     put_flush_packet(&s->pb);

  480. 

  481.     asf->packet_nb_frames = 0;

  482.     asf->packet_timestamp_start = -1;

  483.     asf->packet_timestamp_end = -1;

  484.     asf->packet_size_left = asf->packet_size - PACKET_HEADER_SIZE;

  485.     init_put_byte(&asf->pb, asf->packet_buf, asf->packet_size, 1,

  486.                   NULL, NULL, NULL, NULL);

  487. 

  488.     return 0;

  489. }

  490. 

  491. static int asf_write_stream_header(AVFormatContext *s)

  492. {

  493.     ASFContext *asf = s->priv_data;

  494. 

  495.     asf->is_streamed = 1;

  496. 

  497.     return asf_write_header(s);

  498. }

  499. 

  500. /* write a fixed size packet */

  501. static int put_packet(AVFormatContext *s,

  502.                        unsigned int timestamp, unsigned int duration,

  503.                        int nb_frames, int padsize)

  504. {

  505.     ASFContext *asf = s->priv_data;

  506.     ByteIOContext *pb = &s->pb;

  507.     int flags;

  508. 

  509.     if (asf->is_streamed) {

  510.         put_chunk(s, 0x4424, asf->packet_size, 0);

  511.     }

  512. 

  513.     put_byte(pb, 0x82);

  514.     put_le16(pb, 0);

  515. 

  516.     flags = 0x01; /* nb segments present */

  517.     if (padsize > 0) {

  518.         if (padsize < 256)

  519.             flags |= 0x08;

  520.         else

  521.             flags |= 0x10;

  522.     }

  523.     put_byte(pb, flags); /* flags */

  524.     put_byte(pb, 0x5d);

  525.     if (flags & 0x10)

  526.         put_le16(pb, padsize - 2);

  527.     if (flags & 0x08)

  528.         put_byte(pb, padsize - 1);

  529.     put_le32(pb, timestamp);

  530.     put_le16(pb, duration);

  531.     put_byte(pb, nb_frames | 0x80);

  532. 

  533.     return PACKET_HEADER_SIZE + ((flags & 0x18) >> 3);

  534. }

  535. 

  536. static void flush_packet(AVFormatContext *s)

  537. {

  538.     ASFContext *asf = s->priv_data;

  539.     int hdr_size, ptr;

  540. 

  541.     hdr_size = put_packet(s, asf->packet_timestamp_start,

  542.                asf->packet_timestamp_end - asf->packet_timestamp_start,

  543.                asf->packet_nb_frames, asf->packet_size_left);

  544. 

  545.     /* Clear out the padding bytes */

  546.     ptr = asf->packet_size - hdr_size - asf->packet_size_left;

  547.     memset(asf->packet_buf + ptr, 0, asf->packet_size_left);

  548. 

  549.     put_buffer(&s->pb, asf->packet_buf, asf->packet_size - hdr_size);

  550. 

  551.     put_flush_packet(&s->pb);

  552.     asf->nb_packets++;

  553.     asf->packet_nb_frames = 0;

  554.     asf->packet_timestamp_start = -1;

  555.     asf->packet_timestamp_end = -1;

  556.     asf->packet_size_left = asf->packet_size - PACKET_HEADER_SIZE;

  557.     init_put_byte(&asf->pb, asf->packet_buf, asf->packet_size, 1,

  558.                   NULL, NULL, NULL, NULL);

  559. }

  560. 

  561. static void put_frame_header(AVFormatContext *s, ASFStream *stream, int timestamp,

  562.                              int payload_size, int frag_offset, int frag_len)

  563. {

  564.     ASFContext *asf = s->priv_data;

  565.     ByteIOContext *pb = &asf->pb;

  566.     int val;

  567. 

  568.     val = stream->num;

  569.     if (s->streams[val - 1]->codec.coded_frame->key_frame /* && frag_offset == 0 */)

  570.         val |= 0x80;

  571.     put_byte(pb, val);

  572.     put_byte(pb, stream->seq);

  573.     put_le32(pb, frag_offset); /* fragment offset */

  574.     put_byte(pb, 0x08); /* flags */

  575.     put_le32(pb, payload_size);

  576.     put_le32(pb, timestamp);

  577.     put_le16(pb, frag_len);

  578. }

  579. 

  580. 

  581. /* Output a frame. We suppose that payload_size <= PACKET_SIZE.

  582. 

  583.    It is there that you understand that the ASF format is really

  584.    crap. They have misread the MPEG Systems spec !

  585.  */

  586. static void put_frame(AVFormatContext *s, ASFStream *stream, int timestamp,

  587.                       const uint8_t *buf, int payload_size)

  588. {

  589.     ASFContext *asf = s->priv_data;

  590.     int frag_pos, frag_len, frag_len1;

  591. 

  592.     frag_pos = 0;

  593.     while (frag_pos < payload_size) {

  594.         frag_len = payload_size - frag_pos;

  595.         frag_len1 = asf->packet_size_left - FRAME_HEADER_SIZE;

  596.         if (frag_len1 > 0) {

  597.             if (frag_len > frag_len1)

  598.                 frag_len = frag_len1;

  599.             put_frame_header(s, stream, timestamp+1, payload_size, frag_pos, frag_len);

  600.             put_buffer(&asf->pb, buf, frag_len);

  601.             asf->packet_size_left -= (frag_len + FRAME_HEADER_SIZE);

  602.             asf->packet_timestamp_end = timestamp;

  603.             if (asf->packet_timestamp_start == -1)

  604.                 asf->packet_timestamp_start = timestamp;

  605.             asf->packet_nb_frames++;

  606.         } else {

  607.             frag_len = 0;

  608.         }

  609.         frag_pos += frag_len;

  610.         buf += frag_len;

  611.         /* output the frame if filled */

  612.         if (asf->packet_size_left <= FRAME_HEADER_SIZE)

  613.             flush_packet(s);

  614.     }

  615.     stream->seq++;

  616. }

  617. 

  618. 

  619. static int asf_write_packet(AVFormatContext *s, int stream_index,

  620.                             const uint8_t *buf, int size, int64_t timestamp)

  621. {

  622.     ASFContext *asf = s->priv_data;

  623.     ASFStream *stream;

  624.     int64_t duration;

  625.     AVCodecContext *codec;

  626. 

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

  628.     stream = &asf->streams[stream_index];

  629. 

  630.     if (codec->codec_type == CODEC_TYPE_AUDIO) {

  631.         duration = (codec->frame_number * codec->frame_size * int64_t_C(10000000)) /

  632.             codec->sample_rate;

  633.     } else {

  634.         duration = av_rescale(codec->frame_number * codec->frame_rate_base, 10000000, codec->frame_rate);

  635.     }

  636.     if (duration > asf->duration)

  637.         asf->duration = duration;

  638. 

  639.     put_frame(s, stream, timestamp, buf, size);

  640.     return 0;

  641. }

  642. 

  643. static int asf_write_trailer(AVFormatContext *s)

  644. {

  645.     ASFContext *asf = s->priv_data;

  646.     int64_t file_size;

  647. 

  648.     /* flush the current packet */

  649.     if (asf->pb.buf_ptr > asf->pb.buffer)

  650.         flush_packet(s);

  651. 

  652.     if (asf->is_streamed) {

  653.         put_chunk(s, 0x4524, 0, 0); /* end of stream */

  654.     } else {

  655.         /* rewrite an updated header */

  656.         file_size = url_ftell(&s->pb);

  657.         url_fseek(&s->pb, 0, SEEK_SET);

  658.         asf_write_header1(s, file_size, file_size - asf->data_offset);

  659.     }

  660. 

  661.     put_flush_packet(&s->pb);

  662.     return 0;

  663. }

  664. 

  665. /**********************************/

  666. /* decoding */

  667. 

  668. //#define DEBUG

  669. 

  670. #ifdef DEBUG

  671. #define PRINT_IF_GUID(g,cmp) \

  672. if (!memcmp(g, &cmp, sizeof(GUID))) \

  673.     printf("(GUID: %s) ", #cmp)

  674. 

  675. static void print_guid(const GUID *g)

  676. {

  677.     int i;

  678.     PRINT_IF_GUID(g, asf_header);

  679.     else PRINT_IF_GUID(g, file_header);

  680.     else PRINT_IF_GUID(g, stream_header);

  681.     else PRINT_IF_GUID(g, audio_stream);

  682.     else PRINT_IF_GUID(g, audio_conceal_none);

  683.     else PRINT_IF_GUID(g, video_stream);

  684.     else PRINT_IF_GUID(g, video_conceal_none);

  685.     else PRINT_IF_GUID(g, comment_header);

  686.     else PRINT_IF_GUID(g, codec_comment_header);

  687.     else PRINT_IF_GUID(g, codec_comment1_header);

  688.     else PRINT_IF_GUID(g, data_header);

  689.     else PRINT_IF_GUID(g, index_guid);

  690.     else PRINT_IF_GUID(g, head1_guid);

  691.     else PRINT_IF_GUID(g, head2_guid);

  692.     else PRINT_IF_GUID(g, my_guid);

  693.     else

  694.         printf("(GUID: unknown) ");

  695.     printf("0x%08x, 0x%04x, 0x%04x, {", g->v1, g->v2, g->v3);

  696.     for(i=0;i<8;i++)

  697.         printf(" 0x%02x,", g->v4[i]);

  698.     printf("}\n");

  699. }

  700. #undef PRINT_IF_GUID(g,cmp)

  701. #endif

  702. 

  703. static void get_guid(ByteIOContext *s, GUID *g)

  704. {

  705.     int i;

  706. 

  707.     g->v1 = get_le32(s);

  708.     g->v2 = get_le16(s);

  709.     g->v3 = get_le16(s);

  710.     for(i=0;i<8;i++)

  711.         g->v4[i] = get_byte(s);

  712. }

  713. 

  714. #if 0

  715. static void get_str16(ByteIOContext *pb, char *buf, int buf_size)

  716. {

  717.     int len, c;

  718.     char *q;

  719. 

  720.     len = get_le16(pb);

  721.     q = buf;

  722.     while (len > 0) {

  723.         c = get_le16(pb);

  724.         if ((q - buf) < buf_size - 1)

  725.             *q++ = c;

  726.         len--;

  727.     }

  728.     *q = '\0';

  729. }

  730. #endif

  731. 

  732. static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)

  733. {

  734.     int c;

  735.     char *q;

  736. 

  737.     q = buf;

  738.     while (len > 0) {

  739.         c = get_le16(pb);

  740.         if ((q - buf) < buf_size - 1)

  741.             *q++ = c;

  742.         len-=2;

  743.     }

  744.     *q = '\0';

  745. }

  746. 

  747. static int asf_probe(AVProbeData *pd)

  748. {

  749.     GUID g;

  750.     const unsigned char *p;

  751.     int i;

  752. 

  753.     /* check file header */

  754.     if (pd->buf_size <= 32)

  755.         return 0;

  756.     p = pd->buf;

  757.     g.v1 = p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);

  758.     p += 4;

  759.     g.v2 = p[0] | (p[1] << 8);

  760.     p += 2;

  761.     g.v3 = p[0] | (p[1] << 8);

  762.     p += 2;

  763.     for(i=0;i<8;i++)

  764.         g.v4[i] = *p++;

  765. 

  766.     if (!memcmp(&g, &asf_header, sizeof(GUID)))

  767.         return AVPROBE_SCORE_MAX;

  768.     else

  769.         return 0;

  770. }

  771. 

  772. static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)

  773. {

  774.     ASFContext *asf = s->priv_data;

  775.     GUID g;

  776.     ByteIOContext *pb = &s->pb;

  777.     AVStream *st;

  778.     ASFStream *asf_st;

  779.     int size, i;

  780.     int64_t gsize;

  781. 

  782.     av_set_pts_info(s, 32, 1, 1000); /* 32 bit pts in ms */

  783. 

  784.     get_guid(pb, &g);

  785.     if (memcmp(&g, &asf_header, sizeof(GUID)))

  786.         goto fail;

  787.     get_le64(pb);

  788.     get_le32(pb);

  789.     get_byte(pb);

  790.     get_byte(pb);

  791.     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));

  792.     for(;;) {

  793.         get_guid(pb, &g);

  794.         gsize = get_le64(pb);

  795. #ifdef DEBUG

  796.         printf("%08Lx: ", url_ftell(pb) - 24);

  797.         print_guid(&g);

  798.         printf("  size=0x%Lx\n", gsize);

  799. #endif

  800.         if (gsize < 24)

  801.             goto fail;

  802.         if (!memcmp(&g, &file_header, sizeof(GUID))) {

  803.             get_guid(pb, &asf->hdr.guid);

  804. 	    asf->hdr.file_size		= get_le64(pb);

  805. 	    asf->hdr.create_time	= get_le64(pb);

  806. 	    asf->hdr.packets_count	= get_le64(pb);

  807. 	    asf->hdr.play_time		= get_le64(pb);

  808. 	    asf->hdr.send_time		= get_le64(pb);

  809. 	    asf->hdr.preroll		= get_le32(pb);

  810. 	    asf->hdr.ignore		= get_le32(pb);

  811. 	    asf->hdr.flags		= get_le32(pb);

  812. 	    asf->hdr.min_pktsize	= get_le32(pb);

  813. 	    asf->hdr.max_pktsize	= get_le32(pb);

  814. 	    asf->hdr.max_bitrate	= get_le32(pb);

  815. 	    asf->packet_size = asf->hdr.max_pktsize;

  816.             asf->nb_packets = asf->hdr.packets_count;

  817.         } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {

  818.             int type, total_size, type_specific_size;

  819.             unsigned int tag1;

  820.             int64_t pos1, pos2;

  821. 

  822.             pos1 = url_ftell(pb);

  823. 

  824.             st = av_new_stream(s, 0);

  825.             if (!st)

  826.                 goto fail;

  827.             asf_st = av_mallocz(sizeof(ASFStream));

  828.             if (!asf_st)

  829.                 goto fail;

  830.             st->priv_data = asf_st;

  831.             st->start_time = asf->hdr.preroll / (10000000 / AV_TIME_BASE);

  832. 	    st->duration = (asf->hdr.send_time - asf->hdr.preroll) / 

  833.                 (10000000 / AV_TIME_BASE);

  834.             get_guid(pb, &g);

  835.             if (!memcmp(&g, &audio_stream, sizeof(GUID))) {

  836.                 type = CODEC_TYPE_AUDIO;

  837.             } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {

  838.                 type = CODEC_TYPE_VIDEO;

  839.             } else {

  840.                 goto fail;

  841.             }

  842.             get_guid(pb, &g);

  843.             total_size = get_le64(pb);

  844.             type_specific_size = get_le32(pb);

  845.             get_le32(pb);

  846. 	    st->id = get_le16(pb) & 0x7f; /* stream id */

  847.             // mapping of asf ID to AV stream ID;

  848.             asf->asfid2avid[st->id] = s->nb_streams - 1;

  849. 

  850.             get_le32(pb);

  851. 	    st->codec.codec_type = type;

  852.             st->codec.frame_rate = 15 * s->pts_den / s->pts_num; // 15 fps default

  853.             if (type == CODEC_TYPE_AUDIO) {

  854.                 get_wav_header(pb, &st->codec, type_specific_size);

  855. 		/* We have to init the frame size at some point .... */

  856. 		pos2 = url_ftell(pb);

  857. 		if (gsize > (pos2 + 8 - pos1 + 24)) {

  858. 		    asf_st->ds_span = get_byte(pb);

  859. 		    asf_st->ds_packet_size = get_le16(pb);

  860. 		    asf_st->ds_chunk_size = get_le16(pb);

  861. 		    asf_st->ds_data_size = get_le16(pb);

  862. 		    asf_st->ds_silence_data = get_byte(pb);

  863. 		}

  864. 		//printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",

  865. 		//       asf_st->ds_packet_size, asf_st->ds_chunk_size,

  866. 		//       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);

  867. 		if (asf_st->ds_span > 1) {

  868. 		    if (!asf_st->ds_chunk_size

  869. 			|| (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1))

  870. 			asf_st->ds_span = 0; // disable descrambling

  871. 		}

  872.                 switch (st->codec.codec_id) {

  873.                 case CODEC_ID_MP3:

  874.                     st->codec.frame_size = MPA_FRAME_SIZE;

  875.                     break;

  876.                 case CODEC_ID_PCM_S16LE:

  877.                 case CODEC_ID_PCM_S16BE:

  878.                 case CODEC_ID_PCM_U16LE:

  879.                 case CODEC_ID_PCM_U16BE:

  880.                 case CODEC_ID_PCM_S8:

  881.                 case CODEC_ID_PCM_U8:

  882.                 case CODEC_ID_PCM_ALAW:

  883.                 case CODEC_ID_PCM_MULAW:

  884.                     st->codec.frame_size = 1;

  885.                     break;

  886.                 default:

  887.                     /* This is probably wrong, but it prevents a crash later */

  888.                     st->codec.frame_size = 1;

  889.                     break;

  890.                 }

  891.             } else {

  892. 		get_le32(pb);

  893.                 get_le32(pb);

  894.                 get_byte(pb);

  895.                 size = get_le16(pb); /* size */

  896.                 get_le32(pb); /* size */

  897.                 st->codec.width = get_le32(pb);

  898. 		st->codec.height = get_le32(pb);

  899.                 /* not available for asf */

  900.                 get_le16(pb); /* panes */

  901. 		st->codec.bits_per_sample = get_le16(pb); /* depth */

  902.                 tag1 = get_le32(pb);

  903. 		url_fskip(pb, 20);

  904. 		if (size > 40) {

  905. 		    st->codec.extradata_size = size - 40;

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

  907. 		    get_buffer(pb, st->codec.extradata, st->codec.extradata_size);

  908. 		}

  909.                 st->codec.codec_tag = tag1;

  910. 		st->codec.codec_id = codec_get_id(codec_bmp_tags, tag1);

  911.             }

  912.             pos2 = url_ftell(pb);

  913.             url_fskip(pb, gsize - (pos2 - pos1 + 24));

  914.         } else if (!memcmp(&g, &data_header, sizeof(GUID))) {

  915.             break;

  916.         } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {

  917.             int len1, len2, len3, len4, len5;

  918. 

  919.             len1 = get_le16(pb);

  920.             len2 = get_le16(pb);

  921.             len3 = get_le16(pb);

  922.             len4 = get_le16(pb);

  923.             len5 = get_le16(pb);

  924.             get_str16_nolen(pb, len1, s->title, sizeof(s->title));

  925.             get_str16_nolen(pb, len2, s->author, sizeof(s->author));

  926.             get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));

  927.             get_str16_nolen(pb, len4, s->comment, sizeof(s->comment));

  928. 	    url_fskip(pb, len5);

  929. #if 0

  930.         } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {

  931.             int v1, v2;

  932.             get_guid(pb, &g);

  933.             v1 = get_le32(pb);

  934.             v2 = get_le16(pb);

  935.         } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {

  936.             int len, v1, n, num;

  937.             char str[256], *q;

  938.             char tag[16];

  939. 

  940.             get_guid(pb, &g);

  941.             print_guid(&g);

  942. 

  943.             n = get_le32(pb);

  944.             for(i=0;i<n;i++) {

  945.                 num = get_le16(pb); /* stream number */

  946.                 get_str16(pb, str, sizeof(str));

  947.                 get_str16(pb, str, sizeof(str));

  948.                 len = get_le16(pb);

  949.                 q = tag;

  950.                 while (len > 0) {

  951.                     v1 = get_byte(pb);

  952.                     if ((q - tag) < sizeof(tag) - 1)

  953.                         *q++ = v1;

  954.                     len--;

  955.                 }

  956.                 *q = '\0';

  957.             }

  958. #endif

  959.         } else if (url_feof(pb)) {

  960.             goto fail;

  961.         } else {

  962.             url_fseek(pb, gsize - 24, SEEK_CUR);

  963.         }

  964.     }

  965.     get_guid(pb, &g);

  966.     get_le64(pb);

  967.     get_byte(pb);

  968.     get_byte(pb);

  969.     if (url_feof(pb))

  970.         goto fail;

  971.     asf->data_offset = url_ftell(pb);

  972.     asf->packet_size_left = 0;

  973. 

  974.     return 0;

  975. 

  976.  fail:

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

  978.         AVStream *st = s->streams[i];

  979. 	if (st) {

  980. 	    av_free(st->priv_data);

  981.             av_free(st->codec.extradata);

  982. 	}

  983.         av_free(st);

  984.     }

  985.     return -1;

  986. }

  987. 

  988. #define DO_2BITS(bits, var, defval) \

  989.     switch (bits & 3) \

  990.     { \

  991.     case 3: var = get_le32(pb); rsize += 4; break; \

  992.     case 2: var = get_le16(pb); rsize += 2; break; \

  993.     case 1: var = get_byte(pb); rsize++; break; \

  994.     default: var = defval; break; \

  995.     }

  996. 

  997. static int asf_get_packet(AVFormatContext *s)

  998. {

  999.     ASFContext *asf = s->priv_data;

  1000.     ByteIOContext *pb = &s->pb;

  1001.     uint32_t packet_length, padsize;

  1002.     int rsize = 11;

  1003.     int c = get_byte(pb);

  1004.     if (c != 0x82) {

  1005.         if (!url_feof(pb))

  1006. 	    printf("ff asf bad header %x  at:%lld\n", c, url_ftell(pb));

  1007. 	return -EIO;

  1008.     }

  1009.     if ((c & 0x0f) == 2) { // always true for now

  1010. 	if (get_le16(pb) != 0) {

  1011.             if (!url_feof(pb))

  1012. 		printf("ff asf bad non zero\n");

  1013. 	    return -EIO;

  1014. 	}

  1015.     }

  1016. 

  1017.     asf->packet_flags = get_byte(pb);

  1018.     asf->packet_property = get_byte(pb);

  1019. 

  1020.     DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);

  1021.     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored

  1022.     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length

  1023. 

  1024.     asf->packet_timestamp = get_le32(pb);

  1025.     get_le16(pb); /* duration */

  1026.     // rsize has at least 11 bytes which have to be present

  1027. 

  1028.     if (asf->packet_flags & 0x01) {

  1029. 	asf->packet_segsizetype = get_byte(pb); rsize++;

  1030.         asf->packet_segments = asf->packet_segsizetype & 0x3f;

  1031.     } else {

  1032. 	asf->packet_segments = 1;

  1033.         asf->packet_segsizetype = 0x80;

  1034.     }

  1035.     asf->packet_size_left = packet_length - padsize - rsize;

  1036.     if (packet_length < asf->hdr.min_pktsize)

  1037.         padsize += asf->hdr.min_pktsize - packet_length;

  1038.     asf->packet_padsize = padsize;

  1039. #ifdef DEBUG

  1040.     printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);

  1041. #endif

  1042.     return 0;

  1043. }

  1044. 

  1045. static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)

  1046. {

  1047.     ASFContext *asf = s->priv_data;

  1048.     ASFStream *asf_st = 0;

  1049.     ByteIOContext *pb = &s->pb;

  1050.     //static int pc = 0;

  1051.     for (;;) {

  1052. 	int rsize = 0;

  1053. 	if (asf->packet_size_left < FRAME_HEADER_SIZE

  1054. 	    || asf->packet_segments < 1) {

  1055. 	    //asf->packet_size_left <= asf->packet_padsize) {

  1056. 	    int ret = asf->packet_size_left + asf->packet_padsize;

  1057. 	    //printf("PacketLeftSize:%d  Pad:%d Pos:%Ld\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));

  1058. 	    /* fail safe */

  1059. 	    url_fskip(pb, ret);

  1060. 	    ret = asf_get_packet(s);

  1061. 	    //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);

  1062. 	    if (ret < 0 || url_feof(pb))

  1063. 		return -EIO;

  1064.             asf->packet_time_start = 0;

  1065.             continue;

  1066. 	}

  1067. 	if (asf->packet_time_start == 0) {

  1068. 	    /* read frame header */

  1069.             int num = get_byte(pb);

  1070. 	    asf->packet_segments--;

  1071. 	    rsize++;

  1072. 	    asf->packet_key_frame = (num & 0x80) >> 7;

  1073. 	    asf->stream_index = asf->asfid2avid[num & 0x7f];

  1074. 	    // sequence should be ignored!

  1075. 	    DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);

  1076. 	    DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);

  1077. 	    DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);

  1078. 

  1079. 	    if (asf->packet_replic_size > 1) {

  1080.                 // it should be always at least 8 bytes - FIXME validate

  1081. 		asf->packet_obj_size = get_le32(pb);

  1082. 		asf->packet_frag_timestamp = get_le32(pb); // timestamp

  1083. 		if (asf->packet_replic_size > 8)

  1084. 		    url_fskip(pb, asf->packet_replic_size - 8);

  1085. 		rsize += asf->packet_replic_size; // FIXME - check validity

  1086. 	    } else {

  1087. 		// multipacket - frag_offset is begining timestamp

  1088. 		asf->packet_time_start = asf->packet_frag_offset;

  1089.                 asf->packet_frag_offset = 0;

  1090. 		asf->packet_frag_timestamp = asf->packet_timestamp;

  1091. 

  1092. 		if (asf->packet_replic_size == 1) {

  1093. 		    asf->packet_time_delta = get_byte(pb);

  1094. 		    rsize++;

  1095. 		}

  1096. 	    }

  1097. 	    if (asf->packet_flags & 0x01) {

  1098. 		DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal

  1099. #undef DO_2BITS

  1100. 		//printf("Fragsize %d\n", asf->packet_frag_size);

  1101. 	    } else {

  1102. 		asf->packet_frag_size = asf->packet_size_left - rsize;

  1103. 		//printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);

  1104. 	    }

  1105. 	    if (asf->packet_replic_size == 1) {

  1106. 		asf->packet_multi_size = asf->packet_frag_size;

  1107. 		if (asf->packet_multi_size > asf->packet_size_left) {

  1108. 		    asf->packet_segments = 0;

  1109.                     continue;

  1110. 		}

  1111. 	    }

  1112. 	    asf->packet_size_left -= rsize;

  1113. 	    //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);

  1114. 

  1115. 	    if (asf->stream_index < 0) {

  1116.                 asf->packet_time_start = 0;

  1117. 		/* unhandled packet (should not happen) */

  1118. 		url_fskip(pb, asf->packet_frag_size);

  1119. 		asf->packet_size_left -= asf->packet_frag_size;

  1120. 		printf("ff asf skip %d  %d\n", asf->packet_frag_size, num & 0x7f);

  1121.                 continue;

  1122. 	    }

  1123. 	    asf->asf_st = s->streams[asf->stream_index]->priv_data;

  1124. 	}

  1125. 	asf_st = asf->asf_st;

  1126. 

  1127. 	if ((asf->packet_frag_offset != asf_st->frag_offset

  1128. 	     || (asf->packet_frag_offset

  1129. 		 && asf->packet_seq != asf_st->seq)) // seq should be ignored

  1130. 	   ) {

  1131. 	    /* cannot continue current packet: free it */

  1132. 	    // FIXME better check if packet was already allocated

  1133. 	    printf("ff asf parser skips: %d - %d     o:%d - %d    %d %d   fl:%d\n",

  1134. 		   asf_st->pkt.size,

  1135. 		   asf->packet_obj_size,

  1136. 		   asf->packet_frag_offset, asf_st->frag_offset,

  1137. 		   asf->packet_seq, asf_st->seq, asf->packet_frag_size);

  1138. 	    if (asf_st->pkt.size)

  1139. 		av_free_packet(&asf_st->pkt);

  1140. 	    asf_st->frag_offset = 0;

  1141. 	    if (asf->packet_frag_offset != 0) {

  1142. 		url_fskip(pb, asf->packet_frag_size);

  1143. 		printf("ff asf parser skiping %db\n", asf->packet_frag_size);

  1144. 		asf->packet_size_left -= asf->packet_frag_size;

  1145. 		continue;

  1146. 	    }

  1147. 	}

  1148. 	if (asf->packet_replic_size == 1) {

  1149. 	    // frag_offset is here used as the begining timestamp

  1150. 	    asf->packet_frag_timestamp = asf->packet_time_start;

  1151. 	    asf->packet_time_start += asf->packet_time_delta;

  1152. 	    asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);

  1153. 	    asf->packet_size_left--;

  1154.             asf->packet_multi_size--;

  1155. 	    if (asf->packet_multi_size < asf->packet_obj_size)

  1156. 	    {

  1157. 		asf->packet_time_start = 0;

  1158. 		url_fskip(pb, asf->packet_multi_size);

  1159. 		asf->packet_size_left -= asf->packet_multi_size;

  1160.                 continue;

  1161. 	    }

  1162. 	    asf->packet_multi_size -= asf->packet_obj_size;

  1163. 	    //printf("COMPRESS size  %d  %d  %d   ms:%d\n", asf->packet_obj_size, asf->packet_frag_timestamp, asf->packet_size_left, asf->packet_multi_size);

  1164. 	}

  1165. 	if (asf_st->frag_offset == 0) {

  1166. 	    /* new packet */

  1167. 	    av_new_packet(&asf_st->pkt, asf->packet_obj_size);

  1168. 	    asf_st->seq = asf->packet_seq;

  1169. 	    asf_st->pkt.pts = asf->packet_frag_timestamp - asf->hdr.preroll;

  1170. 	    asf_st->pkt.stream_index = asf->stream_index;

  1171. 	    if (asf->packet_key_frame)

  1172. 		asf_st->pkt.flags |= PKT_FLAG_KEY;

  1173. 	}

  1174. 

  1175. 	/* read data */

  1176. 	//printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",

  1177. 	//       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,

  1178. 	//       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);

  1179. 	asf->packet_size_left -= asf->packet_frag_size;

  1180. 	if (asf->packet_size_left < 0)

  1181.             continue;

  1182. 	get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,

  1183. 		   asf->packet_frag_size);

  1184. 	asf_st->frag_offset += asf->packet_frag_size;

  1185. 	/* test if whole packet is read */

  1186. 	if (asf_st->frag_offset == asf_st->pkt.size) {

  1187. 	    /* return packet */

  1188. 	    if (asf_st->ds_span > 1) {

  1189. 		/* packet descrambling */

  1190. 		char* newdata = av_malloc(asf_st->pkt.size);

  1191. 		if (newdata) {

  1192. 		    int offset = 0;

  1193. 		    while (offset < asf_st->pkt.size) {

  1194. 			int off = offset / asf_st->ds_chunk_size;

  1195. 			int row = off / asf_st->ds_span;

  1196. 			int col = off % asf_st->ds_span;

  1197. 			int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;

  1198. 			//printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);

  1199. 			memcpy(newdata + offset,

  1200. 			       asf_st->pkt.data + idx * asf_st->ds_chunk_size,

  1201. 			       asf_st->ds_chunk_size);

  1202. 			offset += asf_st->ds_chunk_size;

  1203. 		    }

  1204. 		    av_free(asf_st->pkt.data);

  1205. 		    asf_st->pkt.data = newdata;

  1206. 		}

  1207. 	    }

  1208. 	    asf_st->frag_offset = 0;

  1209. 	    memcpy(pkt, &asf_st->pkt, sizeof(AVPacket));

  1210. 	    //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);

  1211. 	    asf_st->pkt.size = 0;

  1212. 	    asf_st->pkt.data = 0;

  1213. 	    break; // packet completed

  1214. 	}

  1215.     }

  1216.     return 0;

  1217. }

  1218. 

  1219. static int asf_read_close(AVFormatContext *s)

  1220. {

  1221.     int i;

  1222. 

  1223.     for(i=0;i<s->nb_streams;i++) {

  1224. 	AVStream *st = s->streams[i];

  1225. 	av_free(st->priv_data);

  1226. 	av_free(st->codec.extradata);

  1227.     }

  1228.     return 0;

  1229. }

  1230. 

  1231. static int asf_read_seek(AVFormatContext *s, int64_t pts)

  1232. {

  1233.     printf("SEEK TO %lld", pts);

  1234.     return -1;

  1235. }

  1236. 

  1237. static AVInputFormat asf_iformat = {

  1238.     "asf",

  1239.     "asf format",

  1240.     sizeof(ASFContext),

  1241.     asf_probe,

  1242.     asf_read_header,

  1243.     asf_read_packet,

  1244.     asf_read_close,

  1245.     asf_read_seek,

  1246. };

  1247. 

  1248. static AVOutputFormat asf_oformat = {

  1249.     "asf",

  1250.     "asf format",

  1251.     "video/x-ms-asf",

  1252.     "asf,wmv",

  1253.     sizeof(ASFContext),

  1254. #ifdef CONFIG_MP3LAME

  1255.     CODEC_ID_MP3,

  1256. #else

  1257.     CODEC_ID_MP2,

  1258. #endif

  1259.     CODEC_ID_MSMPEG4V3,

  1260.     asf_write_header,

  1261.     asf_write_packet,

  1262.     asf_write_trailer,

  1263. };

  1264. 

  1265. static AVOutputFormat asf_stream_oformat = {

  1266.     "asf_stream",

  1267.     "asf format",

  1268.     "video/x-ms-asf",

  1269.     "asf,wmv",

  1270.     sizeof(ASFContext),

  1271. #ifdef CONFIG_MP3LAME

  1272.     CODEC_ID_MP3,

  1273. #else

  1274.     CODEC_ID_MP2,

  1275. #endif

  1276.     CODEC_ID_MSMPEG4V3,

  1277.     asf_write_stream_header,

  1278.     asf_write_packet,

  1279.     asf_write_trailer,

  1280. };

  1281. 

  1282. int asf_init(void)

  1283. {

  1284.     av_register_input_format(&asf_iformat);

  1285.     av_register_output_format(&asf_oformat);

  1286.     av_register_output_format(&asf_stream_oformat);

  1287.     return 0;

  1288. }