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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. static const GUID extended_content_header = {

  180.         0xD2D0A440, 0xE307, 0x11D2, { 0x97, 0xF0, 0x00, 0xA0, 0xC9, 0x5E, 0xA8, 0x50 },

  181. };

  182. 

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

  184.    generate the stream */

  185. static const GUID my_guid = {

  186.     0, 0, 0, { 0, 0, 0, 0, 0, 0, 0, 0 },

  187. };

  188. 

  189. #ifdef CONFIG_ENCODERS

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

  191. {

  192.     int i;

  193. 

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

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

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

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

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

  199. }

  200. 

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

  202. {

  203.     int c;

  204. 

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

  206.     for(;;) {

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

  208.         put_le16(s, c);

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

  210.             break;

  211.     }

  212. }

  213. 

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

  215. {

  216.     int c;

  217. 

  218.     for(;;) {

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

  220.         put_le16(s, c);

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

  222.             break;

  223.     }

  224. }

  225. 

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

  227. {

  228.     int64_t pos;

  229. 

  230.     pos = url_ftell(pb);

  231.     put_guid(pb, g);

  232.     put_le64(pb, 24);

  233.     return pos;

  234. }

  235. 

  236. /* update header size */

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

  238. {

  239.     int64_t pos1;

  240. 

  241.     pos1 = url_ftell(pb);

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

  243.     put_le64(pb, pos1 - pos);

  244.     url_fseek(pb, pos1, SEEK_SET);

  245. }

  246. 

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

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

  249. {

  250.     ASFContext *asf = s->priv_data;

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

  252.     int length;

  253. 

  254.     length = payload_length + 8;

  255.     put_le16(pb, type);

  256.     put_le16(pb, length);

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

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

  259.     put_le16(pb, length);

  260.     asf->seqno++;

  261. }

  262. 

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

  264. static int64_t unix_to_file_time(int ti)

  265. {

  266.     int64_t t;

  267. 

  268.     t = ti * int64_t_C(10000000);

  269.     t += int64_t_C(116444736000000000);

  270.     return t;

  271. }

  272. 

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

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

  275. {

  276.     ASFContext *asf = s->priv_data;

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

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

  279.     int has_title;

  280.     AVCodecContext *enc;

  281.     int64_t header_offset, cur_pos, hpos;

  282.     int bit_rate;

  283. 

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

  285. 

  286.     bit_rate = 0;

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

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

  289. 

  290.         bit_rate += enc->bit_rate;

  291.     }

  292. 

  293.     if (asf->is_streamed) {

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

  295.     }

  296. 

  297.     put_guid(pb, &asf_header);

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

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

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

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

  302. 

  303.     /* file header */

  304.     header_offset = url_ftell(pb);

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

  306.     put_guid(pb, &my_guid);

  307.     put_le64(pb, file_size);

  308.     file_time = 0;

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

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

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

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

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

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

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

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

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

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

  319.     end_header(pb, hpos);

  320. 

  321.     /* unknown headers */

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

  323.     put_guid(pb, &head2_guid);

  324.     put_le32(pb, 6);

  325.     put_le16(pb, 0);

  326.     end_header(pb, hpos);

  327. 

  328.     /* title and other infos */

  329.     if (has_title) {

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

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

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

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

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

  335.         put_le16(pb, 0);

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

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

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

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

  340.         end_header(pb, hpos);

  341.     }

  342. 

  343.     /* stream headers */

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

  345.         int64_t es_pos;

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

  347. 

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

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

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

  351. 

  352.         switch(enc->codec_type) {

  353.         case CODEC_TYPE_AUDIO:

  354.             wav_extra_size = 0;

  355.             extra_size = 18 + wav_extra_size;

  356.             extra_size2 = 0;

  357.             break;

  358.         default:

  359.         case CODEC_TYPE_VIDEO:

  360.             wav_extra_size = 0;

  361.             extra_size = 0x33;

  362.             extra_size2 = 0;

  363.             break;

  364.         }

  365. 

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

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

  368.             put_guid(pb, &audio_stream);

  369.             put_guid(pb, &audio_conceal_none);

  370.         } else {

  371.             put_guid(pb, &video_stream);

  372.             put_guid(pb, &video_conceal_none);

  373.         }

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

  375.         es_pos = url_ftell(pb);

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

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

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

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

  380. 

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

  382.             /* WAVEFORMATEX header */

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

  384. 

  385.             if (wavsize < 0)

  386.                 return -1;

  387.             if (wavsize != extra_size) {

  388.                 cur_pos = url_ftell(pb);

  389.                 url_fseek(pb, es_pos, SEEK_SET);

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

  391.                 url_fseek(pb, cur_pos, SEEK_SET);

  392.             }

  393.         } else {

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

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

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

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

  398. 

  399.             /* BITMAPINFOHEADER header */

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

  401.         }

  402.         end_header(pb, hpos);

  403.     }

  404. 

  405.     /* media comments */

  406. 

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

  408.     put_guid(pb, &codec_comment1_header);

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

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

  411.         AVCodec *p;

  412. 

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

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

  415. 

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

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

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

  419.         

  420.         

  421.         /* id */

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

  423.             put_le16(pb, 2);

  424.             if(!enc->codec_tag)

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

  426.             if(!enc->codec_tag)

  427.                 return -1;

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

  429.         } else {

  430.             put_le16(pb, 4);

  431.             if(!enc->codec_tag)

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

  433.             if(!enc->codec_tag)

  434.                 return -1;

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

  436.         }

  437.     }

  438.     end_header(pb, hpos);

  439. 

  440.     /* patch the header size fields */

  441. 

  442.     cur_pos = url_ftell(pb);

  443.     header_size = cur_pos - header_offset;

  444.     if (asf->is_streamed) {

  445.         header_size += 8 + 30 + 50;

  446. 

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

  448.         put_le16(pb, header_size);

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

  450.         put_le16(pb, header_size);

  451. 

  452.         header_size -= 8 + 30 + 50;

  453.     }

  454.     header_size += 24 + 6;

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

  456.     put_le64(pb, header_size);

  457.     url_fseek(pb, cur_pos, SEEK_SET);

  458. 

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

  460.     asf->data_offset = cur_pos;

  461.     put_guid(pb, &data_header);

  462.     put_le64(pb, data_chunk_size);

  463.     put_guid(pb, &my_guid);

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

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

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

  467.     return 0;

  468. }

  469. 

  470. static int asf_write_header(AVFormatContext *s)

  471. {

  472.     ASFContext *asf = s->priv_data;

  473. 

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

  475. 

  476.     asf->packet_size = PACKET_SIZE;

  477.     asf->nb_packets = 0;

  478. 

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

  480.         //av_free(asf);

  481.         return -1;

  482.     }

  483. 

  484.     put_flush_packet(&s->pb);

  485. 

  486.     asf->packet_nb_frames = 0;

  487.     asf->packet_timestamp_start = -1;

  488.     asf->packet_timestamp_end = -1;

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

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

  491.                   NULL, NULL, NULL, NULL);

  492. 

  493.     return 0;

  494. }

  495. 

  496. static int asf_write_stream_header(AVFormatContext *s)

  497. {

  498.     ASFContext *asf = s->priv_data;

  499. 

  500.     asf->is_streamed = 1;

  501. 

  502.     return asf_write_header(s);

  503. }

  504. 

  505. /* write a fixed size packet */

  506. static int put_packet(AVFormatContext *s,

  507.                        unsigned int timestamp, unsigned int duration,

  508.                        int nb_frames, int padsize)

  509. {

  510.     ASFContext *asf = s->priv_data;

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

  512.     int flags;

  513. 

  514.     if (asf->is_streamed) {

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

  516.     }

  517. 

  518.     put_byte(pb, 0x82);

  519.     put_le16(pb, 0);

  520. 

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

  522.     if (padsize > 0) {

  523.         if (padsize < 256)

  524.             flags |= 0x08;

  525.         else

  526.             flags |= 0x10;

  527.     }

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

  529.     put_byte(pb, 0x5d);

  530.     if (flags & 0x10)

  531.         put_le16(pb, padsize - 2);

  532.     if (flags & 0x08)

  533.         put_byte(pb, padsize - 1);

  534.     put_le32(pb, timestamp);

  535.     put_le16(pb, duration);

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

  537. 

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

  539. }

  540. 

  541. static void flush_packet(AVFormatContext *s)

  542. {

  543.     ASFContext *asf = s->priv_data;

  544.     int hdr_size, ptr;

  545. 

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

  547.                asf->packet_timestamp_end - asf->packet_timestamp_start,

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

  549. 

  550.     /* Clear out the padding bytes */

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

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

  553. 

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

  555. 

  556.     put_flush_packet(&s->pb);

  557.     asf->nb_packets++;

  558.     asf->packet_nb_frames = 0;

  559.     asf->packet_timestamp_start = -1;

  560.     asf->packet_timestamp_end = -1;

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

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

  563.                   NULL, NULL, NULL, NULL);

  564. }

  565. 

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

  567.                              int payload_size, int frag_offset, int frag_len)

  568. {

  569.     ASFContext *asf = s->priv_data;

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

  571.     int val;

  572. 

  573.     val = stream->num;

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

  575.         val |= 0x80;

  576.     put_byte(pb, val);

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

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

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

  580.     put_le32(pb, payload_size);

  581.     put_le32(pb, timestamp);

  582.     put_le16(pb, frag_len);

  583. }

  584. 

  585. 

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

  587. 

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

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

  590.  */

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

  592.                       const uint8_t *buf, int payload_size)

  593. {

  594.     ASFContext *asf = s->priv_data;

  595.     int frag_pos, frag_len, frag_len1;

  596. 

  597.     frag_pos = 0;

  598.     while (frag_pos < payload_size) {

  599.         frag_len = payload_size - frag_pos;

  600.         frag_len1 = asf->packet_size_left - FRAME_HEADER_SIZE;

  601.         if (frag_len1 > 0) {

  602.             if (frag_len > frag_len1)

  603.                 frag_len = frag_len1;

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

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

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

  607.             asf->packet_timestamp_end = timestamp;

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

  609.                 asf->packet_timestamp_start = timestamp;

  610.             asf->packet_nb_frames++;

  611.         } else {

  612.             frag_len = 0;

  613.         }

  614.         frag_pos += frag_len;

  615.         buf += frag_len;

  616.         /* output the frame if filled */

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

  618.             flush_packet(s);

  619.     }

  620.     stream->seq++;

  621. }

  622. 

  623. 

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

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

  626. {

  627.     ASFContext *asf = s->priv_data;

  628.     ASFStream *stream;

  629.     int64_t duration;

  630.     AVCodecContext *codec;

  631. 

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

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

  634. 

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

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

  637.             codec->sample_rate;

  638.     } else {

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

  640.     }

  641.     if (duration > asf->duration)

  642.         asf->duration = duration;

  643. 

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

  645.     return 0;

  646. }

  647. 

  648. static int asf_write_trailer(AVFormatContext *s)

  649. {

  650.     ASFContext *asf = s->priv_data;

  651.     int64_t file_size;

  652. 

  653.     /* flush the current packet */

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

  655.         flush_packet(s);

  656. 

  657.     if (asf->is_streamed) {

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

  659.     } else {

  660.         /* rewrite an updated header */

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

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

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

  664.     }

  665. 

  666.     put_flush_packet(&s->pb);

  667.     return 0;

  668. }

  669. #endif //CONFIG_ENCODERS

  670. 

  671. /**********************************/

  672. /* decoding */

  673. 

  674. //#define DEBUG

  675. 

  676. #ifdef DEBUG

  677. #define PRINT_IF_GUID(g,cmp) \

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

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

  680. 

  681. static void print_guid(const GUID *g)

  682. {

  683.     int i;

  684.     PRINT_IF_GUID(g, asf_header);

  685.     else PRINT_IF_GUID(g, file_header);

  686.     else PRINT_IF_GUID(g, stream_header);

  687.     else PRINT_IF_GUID(g, audio_stream);

  688.     else PRINT_IF_GUID(g, audio_conceal_none);

  689.     else PRINT_IF_GUID(g, video_stream);

  690.     else PRINT_IF_GUID(g, video_conceal_none);

  691.     else PRINT_IF_GUID(g, comment_header);

  692.     else PRINT_IF_GUID(g, codec_comment_header);

  693.     else PRINT_IF_GUID(g, codec_comment1_header);

  694.     else PRINT_IF_GUID(g, data_header);

  695.     else PRINT_IF_GUID(g, index_guid);

  696.     else PRINT_IF_GUID(g, head1_guid);

  697.     else PRINT_IF_GUID(g, head2_guid);

  698.     else PRINT_IF_GUID(g, my_guid);

  699.     else

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

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

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

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

  704.     printf("}\n");

  705. }

  706. #undef PRINT_IF_GUID(g,cmp)

  707. #endif

  708. 

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

  710. {

  711.     int i;

  712. 

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

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

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

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

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

  718. }

  719. 

  720. #if 0

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

  722. {

  723.     int len, c;

  724.     char *q;

  725. 

  726.     len = get_le16(pb);

  727.     q = buf;

  728.     while (len > 0) {

  729.         c = get_le16(pb);

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

  731.             *q++ = c;

  732.         len--;

  733.     }

  734.     *q = '\0';

  735. }

  736. #endif

  737. 

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

  739. {

  740.     int c;

  741.     char *q;

  742. 

  743.     q = buf;

  744.     while (len > 0) {

  745.         c = get_le16(pb);

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

  747.             *q++ = c;

  748.         len-=2;

  749.     }

  750.     *q = '\0';

  751. }

  752. 

  753. static int asf_probe(AVProbeData *pd)

  754. {

  755.     GUID g;

  756.     const unsigned char *p;

  757.     int i;

  758. 

  759.     /* check file header */

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

  761.         return 0;

  762.     p = pd->buf;

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

  764.     p += 4;

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

  766.     p += 2;

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

  768.     p += 2;

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

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

  771. 

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

  773.         return AVPROBE_SCORE_MAX;

  774.     else

  775.         return 0;

  776. }

  777. 

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

  779. {

  780.     ASFContext *asf = s->priv_data;

  781.     GUID g;

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

  783.     AVStream *st;

  784.     ASFStream *asf_st;

  785.     int size, i;

  786.     int64_t gsize;

  787. 

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

  789. 

  790.     get_guid(pb, &g);

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

  792.         goto fail;

  793.     get_le64(pb);

  794.     get_le32(pb);

  795.     get_byte(pb);

  796.     get_byte(pb);

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

  798.     for(;;) {

  799.         get_guid(pb, &g);

  800.         gsize = get_le64(pb);

  801. #ifdef DEBUG

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

  803.         print_guid(&g);

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

  805. #endif

  806.         if (gsize < 24)

  807.             goto fail;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  824.             int type, total_size, type_specific_size;

  825.             unsigned int tag1;

  826.             int64_t pos1, pos2;

  827. 

  828.             pos1 = url_ftell(pb);

  829. 

  830.             st = av_new_stream(s, 0);

  831.             if (!st)

  832.                 goto fail;

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

  834.             if (!asf_st)

  835.                 goto fail;

  836.             st->priv_data = asf_st;

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

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

  839.                 (10000000 / AV_TIME_BASE);

  840.             get_guid(pb, &g);

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

  842.                 type = CODEC_TYPE_AUDIO;

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

  844.                 type = CODEC_TYPE_VIDEO;

  845.             } else {

  846.                 goto fail;

  847.             }

  848.             get_guid(pb, &g);

  849.             total_size = get_le64(pb);

  850.             type_specific_size = get_le32(pb);

  851.             get_le32(pb);

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

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

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

  855. 

  856.             get_le32(pb);

  857. 	    st->codec.codec_type = type;

  858.             /* 1 fps default (XXX: put 0 fps instead) */

  859.             st->codec.frame_rate = 1; 

  860.             st->codec.frame_rate_base = 1;

  861.             if (type == CODEC_TYPE_AUDIO) {

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

  863.                 st->need_parsing = 1;

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

  865. 		pos2 = url_ftell(pb);

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

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

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

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

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

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

  872. 		}

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

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

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

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

  877. 		    if (!asf_st->ds_chunk_size

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

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

  880. 		}

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

  882.                 case CODEC_ID_MP3:

  883.                     st->codec.frame_size = MPA_FRAME_SIZE;

  884.                     break;

  885.                 case CODEC_ID_PCM_S16LE:

  886.                 case CODEC_ID_PCM_S16BE:

  887.                 case CODEC_ID_PCM_U16LE:

  888.                 case CODEC_ID_PCM_U16BE:

  889.                 case CODEC_ID_PCM_S8:

  890.                 case CODEC_ID_PCM_U8:

  891.                 case CODEC_ID_PCM_ALAW:

  892.                 case CODEC_ID_PCM_MULAW:

  893.                     st->codec.frame_size = 1;

  894.                     break;

  895.                 default:

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

  897.                     st->codec.frame_size = 1;

  898.                     break;

  899.                 }

  900.             } else {

  901. 		get_le32(pb);

  902.                 get_le32(pb);

  903.                 get_byte(pb);

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

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

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

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

  908.                 /* not available for asf */

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

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

  911.                 tag1 = get_le32(pb);

  912. 		url_fskip(pb, 20);

  913. 		if (size > 40) {

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

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

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

  917. 		}

  918. 

  919.         /* Extract palette from extradata if bpp <= 8 */

  920.         /* This code assumes that extradata contains only palette */

  921.         /* This is true for all paletted codecs implemented in ffmpeg */

  922.         if (st->codec.extradata_size && (st->codec.bits_per_sample <= 8)) {

  923.             st->codec.palctrl = av_mallocz(sizeof(AVPaletteControl));

  924. #ifdef WORDS_BIGENDIAN

  925.             for (i = 0; i < FFMIN(st->codec.extradata_size, AVPALETTE_SIZE)/4; i++)

  926.                 st->codec.palctrl->palette[i] = bswap_32(((uint32_t*)st->codec.extradata)[i]);

  927. #else

  928.             memcpy(st->codec.palctrl->palette, st->codec.extradata,

  929.                    FFMIN(st->codec.extradata_size, AVPALETTE_SIZE));

  930. #endif

  931.             st->codec.palctrl->palette_changed = 1;

  932.         }

  933. 

  934.                 st->codec.codec_tag = tag1;

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

  936.             }

  937.             pos2 = url_ftell(pb);

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

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

  940.             break;

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

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

  943. 

  944.             len1 = get_le16(pb);

  945.             len2 = get_le16(pb);

  946.             len3 = get_le16(pb);

  947.             len4 = get_le16(pb);

  948.             len5 = get_le16(pb);

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

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

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

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

  953. 	    url_fskip(pb, len5);

  954.        } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {

  955.                 int desc_count, i;

  956. 

  957.                 desc_count = get_le16(pb);

  958.                 for(i=0;i<desc_count;i++)

  959.                 {

  960.                         int name_len,value_type,value_len,value_num = 0;

  961.                         char *name, *value;

  962. 

  963.                         name_len = get_le16(pb);

  964.                         name = (char *)av_mallocz(name_len);

  965.                         get_str16_nolen(pb, name_len, name, name_len);

  966.                         value_type = get_le16(pb);

  967.                         value_len = get_le16(pb);

  968.                         if ((value_type == 0) || (value_type == 1)) // unicode or byte

  969.                         {

  970.                                 value = (char *)av_mallocz(value_len);

  971.                                 get_str16_nolen(pb, value_len, value, value_len);

  972.                                 if (strcmp(name,"WM/AlbumTitle")==0) { strcpy(s->album, value); }

  973.                                 av_free(value);

  974.                         }

  975.                         if ((value_type >= 2) || (value_type <= 5)) // boolean or DWORD or QWORD or WORD

  976.                         {

  977.                                 if (value_type==2) value_num = get_le32(pb);

  978.                                 if (value_type==3) value_num = get_le32(pb);

  979.                                 if (value_type==4) value_num = get_le64(pb);

  980.                                 if (value_type==5) value_num = get_le16(pb);

  981.                                 if (strcmp(name,"WM/Track")==0) s->track = value_num + 1;

  982.                                 if (strcmp(name,"WM/TrackNumber")==0) s->track = value_num;

  983.                         }

  984.                         av_free(name);

  985.                 }

  986. #if 0

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

  988.             int v1, v2;

  989.             get_guid(pb, &g);

  990.             v1 = get_le32(pb);

  991.             v2 = get_le16(pb);

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

  993.             int len, v1, n, num;

  994.             char str[256], *q;

  995.             char tag[16];

  996. 

  997.             get_guid(pb, &g);

  998.             print_guid(&g);

  999. 

  1000.             n = get_le32(pb);

  1001.             for(i=0;i<n;i++) {

  1002.                 num = get_le16(pb); /* stream number */

  1003.                 get_str16(pb, str, sizeof(str));

  1004.                 get_str16(pb, str, sizeof(str));

  1005.                 len = get_le16(pb);

  1006.                 q = tag;

  1007.                 while (len > 0) {

  1008.                     v1 = get_byte(pb);

  1009.                     if ((q - tag) < sizeof(tag) - 1)

  1010.                         *q++ = v1;

  1011.                     len--;

  1012.                 }

  1013.                 *q = '\0';

  1014.             }

  1015. #endif

  1016.         } else if (url_feof(pb)) {

  1017.             goto fail;

  1018.         } else {

  1019.             url_fseek(pb, gsize - 24, SEEK_CUR);

  1020.         }

  1021.     }

  1022.     get_guid(pb, &g);

  1023.     get_le64(pb);

  1024.     get_byte(pb);

  1025.     get_byte(pb);

  1026.     if (url_feof(pb))

  1027.         goto fail;

  1028.     asf->data_offset = url_ftell(pb);

  1029.     asf->packet_size_left = 0;

  1030. 

  1031.     return 0;

  1032. 

  1033.  fail:

  1034.      for(i=0;i<s->nb_streams;i++) {

  1035.         AVStream *st = s->streams[i];

  1036. 	if (st) {

  1037. 	    av_free(st->priv_data);

  1038.             av_free(st->codec.extradata);

  1039. 	}

  1040.         av_free(st);

  1041.     }

  1042.     return -1;

  1043. }

  1044. 

  1045. #define DO_2BITS(bits, var, defval) \

  1046.     switch (bits & 3) \

  1047.     { \

  1048.     case 3: var = get_le32(pb); rsize += 4; break; \

  1049.     case 2: var = get_le16(pb); rsize += 2; break; \

  1050.     case 1: var = get_byte(pb); rsize++; break; \

  1051.     default: var = defval; break; \

  1052.     }

  1053. 

  1054. static int asf_get_packet(AVFormatContext *s)

  1055. {

  1056.     ASFContext *asf = s->priv_data;

  1057.     ByteIOContext *pb = &s->pb;

  1058.     uint32_t packet_length, padsize;

  1059.     int rsize = 11;

  1060.     int c = get_byte(pb);

  1061.     if (c != 0x82) {

  1062.         if (!url_feof(pb))

  1063. 	    printf("ff asf bad header %x  at:%lld\n", c, url_ftell(pb));

  1064. 	return -EIO;

  1065.     }

  1066.     if ((c & 0x0f) == 2) { // always true for now

  1067. 	if (get_le16(pb) != 0) {

  1068.             if (!url_feof(pb))

  1069. 		printf("ff asf bad non zero\n");

  1070. 	    return -EIO;

  1071. 	}

  1072.     }

  1073. 

  1074.     asf->packet_flags = get_byte(pb);

  1075.     asf->packet_property = get_byte(pb);

  1076. 

  1077.     DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);

  1078.     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored

  1079.     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length

  1080. 

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

  1082.     get_le16(pb); /* duration */

  1083.     // rsize has at least 11 bytes which have to be present

  1084. 

  1085.     if (asf->packet_flags & 0x01) {

  1086. 	asf->packet_segsizetype = get_byte(pb); rsize++;

  1087.         asf->packet_segments = asf->packet_segsizetype & 0x3f;

  1088.     } else {

  1089. 	asf->packet_segments = 1;

  1090.         asf->packet_segsizetype = 0x80;

  1091.     }

  1092.     asf->packet_size_left = packet_length - padsize - rsize;

  1093.     if (packet_length < asf->hdr.min_pktsize)

  1094.         padsize += asf->hdr.min_pktsize - packet_length;

  1095.     asf->packet_padsize = padsize;

  1096. #ifdef DEBUG

  1097.     printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);

  1098. #endif

  1099.     return 0;

  1100. }

  1101. 

  1102. static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)

  1103. {

  1104.     ASFContext *asf = s->priv_data;

  1105.     ASFStream *asf_st = 0;

  1106.     ByteIOContext *pb = &s->pb;

  1107.     //static int pc = 0;

  1108.     for (;;) {

  1109. 	int rsize = 0;

  1110. 	if (asf->packet_size_left < FRAME_HEADER_SIZE

  1111. 	    || asf->packet_segments < 1) {

  1112. 	    //asf->packet_size_left <= asf->packet_padsize) {

  1113. 	    int ret = asf->packet_size_left + asf->packet_padsize;

  1114. 	    //printf("PacketLeftSize:%d  Pad:%d Pos:%Ld\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));

  1115. 	    /* fail safe */

  1116. 	    url_fskip(pb, ret);

  1117. 	    ret = asf_get_packet(s);

  1118. 	    //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);

  1119. 	    if (ret < 0 || url_feof(pb))

  1120. 		return -EIO;

  1121.             asf->packet_time_start = 0;

  1122.             continue;

  1123. 	}

  1124. 	if (asf->packet_time_start == 0) {

  1125. 	    /* read frame header */

  1126.             int num = get_byte(pb);

  1127. 	    asf->packet_segments--;

  1128. 	    rsize++;

  1129. 	    asf->packet_key_frame = (num & 0x80) >> 7;

  1130. 	    asf->stream_index = asf->asfid2avid[num & 0x7f];

  1131. 	    // sequence should be ignored!

  1132. 	    DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);

  1133. 	    DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);

  1134. 	    DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);

  1135. 

  1136. 	    if (asf->packet_replic_size > 1) {

  1137.                 // it should be always at least 8 bytes - FIXME validate

  1138. 		asf->packet_obj_size = get_le32(pb);

  1139. 		asf->packet_frag_timestamp = get_le32(pb); // timestamp

  1140. 		if (asf->packet_replic_size > 8)

  1141. 		    url_fskip(pb, asf->packet_replic_size - 8);

  1142. 		rsize += asf->packet_replic_size; // FIXME - check validity

  1143. 	    } else {

  1144. 		// multipacket - frag_offset is begining timestamp

  1145. 		asf->packet_time_start = asf->packet_frag_offset;

  1146.                 asf->packet_frag_offset = 0;

  1147. 		asf->packet_frag_timestamp = asf->packet_timestamp;

  1148. 

  1149. 		if (asf->packet_replic_size == 1) {

  1150. 		    asf->packet_time_delta = get_byte(pb);

  1151. 		    rsize++;

  1152. 		}

  1153. 	    }

  1154. 	    if (asf->packet_flags & 0x01) {

  1155. 		DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal

  1156. #undef DO_2BITS

  1157. 		//printf("Fragsize %d\n", asf->packet_frag_size);

  1158. 	    } else {

  1159. 		asf->packet_frag_size = asf->packet_size_left - rsize;

  1160. 		//printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);

  1161. 	    }

  1162. 	    if (asf->packet_replic_size == 1) {

  1163. 		asf->packet_multi_size = asf->packet_frag_size;

  1164. 		if (asf->packet_multi_size > asf->packet_size_left) {

  1165. 		    asf->packet_segments = 0;

  1166.                     continue;

  1167. 		}

  1168. 	    }

  1169. 	    asf->packet_size_left -= rsize;

  1170. 	    //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);

  1171. 

  1172. 	    if (asf->stream_index < 0) {

  1173.                 asf->packet_time_start = 0;

  1174. 		/* unhandled packet (should not happen) */

  1175. 		url_fskip(pb, asf->packet_frag_size);

  1176. 		asf->packet_size_left -= asf->packet_frag_size;

  1177. 		printf("ff asf skip %d  %d\n", asf->packet_frag_size, num & 0x7f);

  1178.                 continue;

  1179. 	    }

  1180. 	    asf->asf_st = s->streams[asf->stream_index]->priv_data;

  1181. 	}

  1182. 	asf_st = asf->asf_st;

  1183. 

  1184. 	if ((asf->packet_frag_offset != asf_st->frag_offset

  1185. 	     || (asf->packet_frag_offset

  1186. 		 && asf->packet_seq != asf_st->seq)) // seq should be ignored

  1187. 	   ) {

  1188. 	    /* cannot continue current packet: free it */

  1189. 	    // FIXME better check if packet was already allocated

  1190. 	    printf("ff asf parser skips: %d - %d     o:%d - %d    %d %d   fl:%d\n",

  1191. 		   asf_st->pkt.size,

  1192. 		   asf->packet_obj_size,

  1193. 		   asf->packet_frag_offset, asf_st->frag_offset,

  1194. 		   asf->packet_seq, asf_st->seq, asf->packet_frag_size);

  1195. 	    if (asf_st->pkt.size)

  1196. 		av_free_packet(&asf_st->pkt);

  1197. 	    asf_st->frag_offset = 0;

  1198. 	    if (asf->packet_frag_offset != 0) {

  1199. 		url_fskip(pb, asf->packet_frag_size);

  1200. 		printf("ff asf parser skiping %db\n", asf->packet_frag_size);

  1201. 		asf->packet_size_left -= asf->packet_frag_size;

  1202. 		continue;

  1203. 	    }

  1204. 	}

  1205. 	if (asf->packet_replic_size == 1) {

  1206. 	    // frag_offset is here used as the begining timestamp

  1207. 	    asf->packet_frag_timestamp = asf->packet_time_start;

  1208. 	    asf->packet_time_start += asf->packet_time_delta;

  1209. 	    asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);

  1210. 	    asf->packet_size_left--;

  1211.             asf->packet_multi_size--;

  1212. 	    if (asf->packet_multi_size < asf->packet_obj_size)

  1213. 	    {

  1214. 		asf->packet_time_start = 0;

  1215. 		url_fskip(pb, asf->packet_multi_size);

  1216. 		asf->packet_size_left -= asf->packet_multi_size;

  1217.                 continue;

  1218. 	    }

  1219. 	    asf->packet_multi_size -= asf->packet_obj_size;

  1220. 	    //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);

  1221. 	}

  1222. 	if (asf_st->frag_offset == 0) {

  1223. 	    /* new packet */

  1224. 	    av_new_packet(&asf_st->pkt, asf->packet_obj_size);

  1225. 	    asf_st->seq = asf->packet_seq;

  1226. 	    asf_st->pkt.pts = asf->packet_frag_timestamp - asf->hdr.preroll;

  1227. 	    asf_st->pkt.stream_index = asf->stream_index;

  1228. 	    if (asf->packet_key_frame)

  1229. 		asf_st->pkt.flags |= PKT_FLAG_KEY;

  1230. 	}

  1231. 

  1232. 	/* read data */

  1233. 	//printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",

  1234. 	//       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,

  1235. 	//       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);

  1236. 	asf->packet_size_left -= asf->packet_frag_size;

  1237. 	if (asf->packet_size_left < 0)

  1238.             continue;

  1239. 	get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,

  1240. 		   asf->packet_frag_size);

  1241. 	asf_st->frag_offset += asf->packet_frag_size;

  1242. 	/* test if whole packet is read */

  1243. 	if (asf_st->frag_offset == asf_st->pkt.size) {

  1244. 	    /* return packet */

  1245. 	    if (asf_st->ds_span > 1) {

  1246. 		/* packet descrambling */

  1247. 		char* newdata = av_malloc(asf_st->pkt.size);

  1248. 		if (newdata) {

  1249. 		    int offset = 0;

  1250. 		    while (offset < asf_st->pkt.size) {

  1251. 			int off = offset / asf_st->ds_chunk_size;

  1252. 			int row = off / asf_st->ds_span;

  1253. 			int col = off % asf_st->ds_span;

  1254. 			int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;

  1255. 			//printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);

  1256. 			memcpy(newdata + offset,

  1257. 			       asf_st->pkt.data + idx * asf_st->ds_chunk_size,

  1258. 			       asf_st->ds_chunk_size);

  1259. 			offset += asf_st->ds_chunk_size;

  1260. 		    }

  1261. 		    av_free(asf_st->pkt.data);

  1262. 		    asf_st->pkt.data = newdata;

  1263. 		}

  1264. 	    }

  1265. 	    asf_st->frag_offset = 0;

  1266. 	    memcpy(pkt, &asf_st->pkt, sizeof(AVPacket));

  1267. 	    //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);

  1268. 	    asf_st->pkt.size = 0;

  1269. 	    asf_st->pkt.data = 0;

  1270. 	    break; // packet completed

  1271. 	}

  1272.     }

  1273.     return 0;

  1274. }

  1275. 

  1276. static int asf_read_close(AVFormatContext *s)

  1277. {

  1278.     int i;

  1279. 

  1280.     for(i=0;i<s->nb_streams;i++) {

  1281. 	AVStream *st = s->streams[i];

  1282. 	av_free(st->priv_data);

  1283. 	av_free(st->codec.extradata);

  1284.     av_free(st->codec.palctrl);

  1285.     }

  1286.     return 0;

  1287. }

  1288. 

  1289. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts)

  1290. {

  1291. #if 0

  1292.     ASFContext *asf = s->priv_data;

  1293.     int i;

  1294. 

  1295.     for(i = 0;; i++) {

  1296.         url_fseek(&s->pb, asf->data_offset + i * asf->packet_size, SEEK_SET);

  1297.         if (asf_get_packet(s) < 0)

  1298.             break;

  1299.         printf("timestamp=%0.3f\n",  asf->packet_timestamp / 1000.0);

  1300.     }

  1301. #endif

  1302.     return -1;

  1303. }

  1304. 

  1305. static AVInputFormat asf_iformat = {

  1306.     "asf",

  1307.     "asf format",

  1308.     sizeof(ASFContext),

  1309.     asf_probe,

  1310.     asf_read_header,

  1311.     asf_read_packet,

  1312.     asf_read_close,

  1313.     asf_read_seek,

  1314. };

  1315. 

  1316. #ifdef CONFIG_ENCODERS

  1317. static AVOutputFormat asf_oformat = {

  1318.     "asf",

  1319.     "asf format",

  1320.     "video/x-ms-asf",

  1321.     "asf,wmv",

  1322.     sizeof(ASFContext),

  1323. #ifdef CONFIG_MP3LAME

  1324.     CODEC_ID_MP3,

  1325. #else

  1326.     CODEC_ID_MP2,

  1327. #endif

  1328.     CODEC_ID_MSMPEG4V3,

  1329.     asf_write_header,

  1330.     asf_write_packet,

  1331.     asf_write_trailer,

  1332. };

  1333. 

  1334. static AVOutputFormat asf_stream_oformat = {

  1335.     "asf_stream",

  1336.     "asf format",

  1337.     "video/x-ms-asf",

  1338.     "asf,wmv",

  1339.     sizeof(ASFContext),

  1340. #ifdef CONFIG_MP3LAME

  1341.     CODEC_ID_MP3,

  1342. #else

  1343.     CODEC_ID_MP2,

  1344. #endif

  1345.     CODEC_ID_MSMPEG4V3,

  1346.     asf_write_stream_header,

  1347.     asf_write_packet,

  1348.     asf_write_trailer,

  1349. };

  1350. #endif //CONFIG_ENCODERS

  1351. 

  1352. int asf_init(void)

  1353. {

  1354.     av_register_input_format(&asf_iformat);

  1355. #ifdef CONFIG_ENCODERS

  1356.     av_register_output_format(&asf_oformat);

  1357.     av_register_output_format(&asf_stream_oformat);

  1358. #endif //CONFIG_ENCODERS

  1359.     return 0;

  1360. }