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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 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 v1;

  46.     UINT16 v2;

  47.     UINT16 v3;

  48.     UINT8 v4[8];

  49. } GUID;

  50. 

  51. typedef struct __attribute__((packed)) {

  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 nb_packets;

  87.     INT64 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 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)*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)*tag++;

  215.         put_le16(s, c);

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

  217.             break;

  218.     }

  219. }

  220. 

  221. static INT64 put_header(ByteIOContext *pb, const GUID *g)

  222. {

  223.     INT64 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 pos)

  233. {

  234.     INT64 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 unix_to_file_time(int ti)

  260. {

  261.     INT64 t;

  262. 

  263.     t = ti * INT64_C(10000000);

  264.     t += INT64_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 file_size, INT64 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 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 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.         /* id */

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

  416.             put_le16(pb, 2);

  417.             put_le16(pb, codec_get_tag(codec_wav_tags, enc->codec_id));

  418.         } else {

  419.             put_le16(pb, 4);

  420.             put_le32(pb, codec_get_tag(codec_bmp_tags, enc->codec_id));

  421.         }

  422.     }

  423.     end_header(pb, hpos);

  424. 

  425.     /* patch the header size fields */

  426. 

  427.     cur_pos = url_ftell(pb);

  428.     header_size = cur_pos - header_offset;

  429.     if (asf->is_streamed) {

  430.         header_size += 8 + 30 + 50;

  431. 

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

  433.         put_le16(pb, header_size);

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

  435.         put_le16(pb, header_size);

  436. 

  437.         header_size -= 8 + 30 + 50;

  438.     }

  439.     header_size += 24 + 6;

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

  441.     put_le64(pb, header_size);

  442.     url_fseek(pb, cur_pos, SEEK_SET);

  443. 

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

  445.     asf->data_offset = cur_pos;

  446.     put_guid(pb, &data_header);

  447.     put_le64(pb, data_chunk_size);

  448.     put_guid(pb, &my_guid);

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

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

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

  452.     return 0;

  453. }

  454. 

  455. static int asf_write_header(AVFormatContext *s)

  456. {

  457.     ASFContext *asf = s->priv_data;

  458. 

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

  460. 

  461.     asf->packet_size = PACKET_SIZE;

  462.     asf->nb_packets = 0;

  463. 

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

  465.         //av_free(asf);

  466.         return -1;

  467.     }

  468. 

  469.     put_flush_packet(&s->pb);

  470. 

  471.     asf->packet_nb_frames = 0;

  472.     asf->packet_timestamp_start = -1;

  473.     asf->packet_timestamp_end = -1;

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

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

  476.                   NULL, NULL, NULL, NULL);

  477. 

  478.     return 0;

  479. }

  480. 

  481. static int asf_write_stream_header(AVFormatContext *s)

  482. {

  483.     ASFContext *asf = s->priv_data;

  484. 

  485.     asf->is_streamed = 1;

  486. 

  487.     return asf_write_header(s);

  488. }

  489. 

  490. /* write a fixed size packet */

  491. static int put_packet(AVFormatContext *s,

  492.                        unsigned int timestamp, unsigned int duration,

  493.                        int nb_frames, int padsize)

  494. {

  495.     ASFContext *asf = s->priv_data;

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

  497.     int flags;

  498. 

  499.     if (asf->is_streamed) {

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

  501.     }

  502. 

  503.     put_byte(pb, 0x82);

  504.     put_le16(pb, 0);

  505. 

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

  507.     if (padsize > 0) {

  508.         if (padsize < 256)

  509.             flags |= 0x08;

  510.         else

  511.             flags |= 0x10;

  512.     }

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

  514.     put_byte(pb, 0x5d);

  515.     if (flags & 0x10)

  516.         put_le16(pb, padsize - 2);

  517.     if (flags & 0x08)

  518.         put_byte(pb, padsize - 1);

  519.     put_le32(pb, timestamp);

  520.     put_le16(pb, duration);

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

  522. 

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

  524. }

  525. 

  526. static void flush_packet(AVFormatContext *s)

  527. {

  528.     ASFContext *asf = s->priv_data;

  529.     int hdr_size, ptr;

  530. 

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

  532.                asf->packet_timestamp_end - asf->packet_timestamp_start,

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

  534. 

  535.     /* Clear out the padding bytes */

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

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

  538. 

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

  540. 

  541.     put_flush_packet(&s->pb);

  542.     asf->nb_packets++;

  543.     asf->packet_nb_frames = 0;

  544.     asf->packet_timestamp_start = -1;

  545.     asf->packet_timestamp_end = -1;

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

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

  548.                   NULL, NULL, NULL, NULL);

  549. }

  550. 

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

  552.                              int payload_size, int frag_offset, int frag_len)

  553. {

  554.     ASFContext *asf = s->priv_data;

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

  556.     int val;

  557. 

  558.     val = stream->num;

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

  560.         val |= 0x80;

  561.     put_byte(pb, val);

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

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

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

  565.     put_le32(pb, payload_size);

  566.     put_le32(pb, timestamp);

  567.     put_le16(pb, frag_len);

  568. }

  569. 

  570. 

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

  572. 

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

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

  575.  */

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

  577.                       UINT8 *buf, int payload_size)

  578. {

  579.     ASFContext *asf = s->priv_data;

  580.     int frag_pos, frag_len, frag_len1;

  581. 

  582.     frag_pos = 0;

  583.     while (frag_pos < payload_size) {

  584.         frag_len = payload_size - frag_pos;

  585.         frag_len1 = asf->packet_size_left - FRAME_HEADER_SIZE;

  586.         if (frag_len1 > 0) {

  587.             if (frag_len > frag_len1)

  588.                 frag_len = frag_len1;

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

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

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

  592.             asf->packet_timestamp_end = timestamp;

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

  594.                 asf->packet_timestamp_start = timestamp;

  595.             asf->packet_nb_frames++;

  596.         } else {

  597.             frag_len = 0;

  598.         }

  599.         frag_pos += frag_len;

  600.         buf += frag_len;

  601.         /* output the frame if filled */

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

  603.             flush_packet(s);

  604.     }

  605.     stream->seq++;

  606. }

  607. 

  608. 

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

  610.                             UINT8 *buf, int size, int timestamp)

  611. {

  612.     ASFContext *asf = s->priv_data;

  613.     ASFStream *stream;

  614.     INT64 duration;

  615.     AVCodecContext *codec;

  616. 

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

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

  619. 

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

  621.         duration = (codec->frame_number * codec->frame_size * INT64_C(10000000)) /

  622.             codec->sample_rate;

  623.     } else {

  624.         duration = codec->frame_number *

  625.             ((INT64_C(10000000) * FRAME_RATE_BASE) / codec->frame_rate);

  626.     }

  627.     if (duration > asf->duration)

  628.         asf->duration = duration;

  629. 

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

  631.     return 0;

  632. }

  633. 

  634. static int asf_write_trailer(AVFormatContext *s)

  635. {

  636.     ASFContext *asf = s->priv_data;

  637.     INT64 file_size;

  638. 

  639.     /* flush the current packet */

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

  641.         flush_packet(s);

  642. 

  643.     if (asf->is_streamed) {

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

  645.     } else {

  646.         /* rewrite an updated header */

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

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

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

  650.     }

  651. 

  652.     put_flush_packet(&s->pb);

  653.     return 0;

  654. }

  655. 

  656. /**********************************/

  657. /* decoding */

  658. 

  659. //#define DEBUG

  660. 

  661. #ifdef DEBUG

  662. static void print_guid(const GUID *g)

  663. {

  664.     int i;

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

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

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

  668.     printf("}\n");

  669. }

  670. #endif

  671. 

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

  673. {

  674.     int i;

  675. 

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

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

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

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

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

  681. }

  682. 

  683. #if 0

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

  685. {

  686.     int len, c;

  687.     char *q;

  688. 

  689.     len = get_le16(pb);

  690.     q = buf;

  691.     while (len > 0) {

  692.         c = get_le16(pb);

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

  694.             *q++ = c;

  695.         len--;

  696.     }

  697.     *q = '\0';

  698. }

  699. #endif

  700. 

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

  702. {

  703.     int c;

  704.     char *q;

  705. 

  706.     q = buf;

  707.     while (len > 0) {

  708.         c = get_le16(pb);

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

  710.             *q++ = c;

  711.         len-=2;

  712.     }

  713.     *q = '\0';

  714. }

  715. 

  716. static int asf_probe(AVProbeData *pd)

  717. {

  718.     GUID g;

  719.     const unsigned char *p;

  720.     int i;

  721. 

  722.     /* check file header */

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

  724.         return 0;

  725.     p = pd->buf;

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

  727.     p += 4;

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

  729.     p += 2;

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

  731.     p += 2;

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

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

  734. 

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

  736.         return AVPROBE_SCORE_MAX;

  737.     else

  738.         return 0;

  739. }

  740. 

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

  742. {

  743.     ASFContext *asf = s->priv_data;

  744.     GUID g;

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

  746.     AVStream *st;

  747.     ASFStream *asf_st;

  748.     int size, i;

  749.     INT64 gsize;

  750. 

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

  752. 

  753.     get_guid(pb, &g);

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

  755.         goto fail;

  756.     get_le64(pb);

  757.     get_le32(pb);

  758.     get_byte(pb);

  759.     get_byte(pb);

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

  761.     for(;;) {

  762.         get_guid(pb, &g);

  763.         gsize = get_le64(pb);

  764. #ifdef DEBUG

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

  766.         print_guid(&g);

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

  768. #endif

  769.         if (gsize < 24)

  770.             goto fail;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  787.             int type, total_size;

  788.             unsigned int tag1;

  789.             INT64 pos1, pos2;

  790. 

  791.             pos1 = url_ftell(pb);

  792. 

  793.             st = av_mallocz(sizeof(AVStream));

  794.             if (!st)

  795.                 goto fail;

  796.             s->streams[s->nb_streams] = st;

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

  798.             if (!asf_st)

  799.                 goto fail;

  800.             st->priv_data = asf_st;

  801. 	    st->time_length = (asf->hdr.send_time - asf->hdr.preroll) / 10; // us

  802.             get_guid(pb, &g);

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

  804.                 type = CODEC_TYPE_AUDIO;

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

  806.                 type = CODEC_TYPE_VIDEO;

  807.             } else {

  808.                 goto fail;

  809.             }

  810.             get_guid(pb, &g);

  811.             total_size = get_le64(pb);

  812.             get_le32(pb);

  813.             get_le32(pb);

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

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

  816.             asf->asfid2avid[st->id] = s->nb_streams++;

  817. 

  818.             get_le32(pb);

  819. 	    st->codec.codec_type = type;

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

  821.             if (type == CODEC_TYPE_AUDIO) {

  822.                 get_wav_header(pb, &st->codec, 1);

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

  824. 		pos2 = url_ftell(pb);

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

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

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

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

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

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

  831. 		}

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

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

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

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

  836. 		    if (!asf_st->ds_chunk_size

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

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

  839. 		}

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

  841.                 case CODEC_ID_MP3LAME:

  842.                     st->codec.frame_size = MPA_FRAME_SIZE;

  843.                     break;

  844.                 case CODEC_ID_PCM_S16LE:

  845.                 case CODEC_ID_PCM_S16BE:

  846.                 case CODEC_ID_PCM_U16LE:

  847.                 case CODEC_ID_PCM_U16BE:

  848.                 case CODEC_ID_PCM_S8:

  849.                 case CODEC_ID_PCM_U8:

  850.                 case CODEC_ID_PCM_ALAW:

  851.                 case CODEC_ID_PCM_MULAW:

  852.                     st->codec.frame_size = 1;

  853.                     break;

  854.                 default:

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

  856.                     st->codec.frame_size = 1;

  857.                     break;

  858.                 }

  859.             } else {

  860. 		get_le32(pb);

  861.                 get_le32(pb);

  862.                 get_byte(pb);

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

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

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

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

  867.                 /* not available for asf */

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

  869.                 get_le16(pb); /* depth */

  870.                 tag1 = get_le32(pb);

  871. 		url_fskip(pb, 20);

  872. 		if (size > 40) {

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

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

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

  876. 		}

  877.                 st->codec.codec_tag = st->codec.fourcc = tag1;

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

  879.             }

  880.             pos2 = url_ftell(pb);

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

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

  883.             break;

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

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

  886. 

  887.             len1 = get_le16(pb);

  888.             len2 = get_le16(pb);

  889.             len3 = get_le16(pb);

  890.             len4 = get_le16(pb);

  891.             len5 = get_le16(pb);

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

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

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

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

  896. 	    url_fskip(pb, len5);

  897. #if 0

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

  899.             int v1, v2;

  900.             get_guid(pb, &g);

  901.             v1 = get_le32(pb);

  902.             v2 = get_le16(pb);

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

  904.             int len, v1, n, num;

  905.             char str[256], *q;

  906.             char tag[16];

  907. 

  908.             get_guid(pb, &g);

  909.             print_guid(&g);

  910. 

  911.             n = get_le32(pb);

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

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

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

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

  916.                 len = get_le16(pb);

  917.                 q = tag;

  918.                 while (len > 0) {

  919.                     v1 = get_byte(pb);

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

  921.                         *q++ = v1;

  922.                     len--;

  923.                 }

  924.                 *q = '\0';

  925.             }

  926. #endif

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

  928.             goto fail;

  929.         } else {

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

  931.         }

  932.     }

  933.     get_guid(pb, &g);

  934.     get_le64(pb);

  935.     get_byte(pb);

  936.     get_byte(pb);

  937.     if (url_feof(pb))

  938.         goto fail;

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

  940.     asf->packet_size_left = 0;

  941. 

  942.     return 0;

  943. 

  944.  fail:

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

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

  947. 	if (st) {

  948. 	    av_free(st->priv_data);

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

  950. 	}

  951.         av_free(st);

  952.     }

  953.     return -1;

  954. }

  955. 

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

  957.     switch (bits & 3) \

  958.     { \

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

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

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

  962.     default: var = defval; break; \

  963.     }

  964. 

  965. static int asf_get_packet(AVFormatContext *s)

  966. {

  967.     ASFContext *asf = s->priv_data;

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

  969.     uint32_t packet_length, padsize;

  970.     int rsize = 11;

  971.     int c = get_byte(pb);

  972.     if (c != 0x82) {

  973.         if (!url_feof(pb))

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

  975. 	return -EIO;

  976.     }

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

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

  979.             if (!url_feof(pb))

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

  981. 	    return -EIO;

  982. 	}

  983.     }

  984. 

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

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

  987. 

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

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

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

  991. 

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

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

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

  995. 

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

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

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

  999.     } else {

  1000. 	asf->packet_segments = 1;

  1001.         asf->packet_segsizetype = 0x80;

  1002.     }

  1003.     asf->packet_size_left = packet_length - padsize - rsize;

  1004.     if (packet_length < asf->hdr.min_pktsize)

  1005.         padsize += asf->hdr.min_pktsize - packet_length;

  1006.     asf->packet_padsize = padsize;

  1007. #ifdef DEBUG

  1008.     printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);

  1009. #endif

  1010.     return 0;

  1011. }

  1012. 

  1013. static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)

  1014. {

  1015.     ASFContext *asf = s->priv_data;

  1016.     ASFStream *asf_st = 0;

  1017.     ByteIOContext *pb = &s->pb;

  1018.     //static int pc = 0;

  1019.     for (;;) {

  1020. 	int rsize = 0;

  1021. 	if (asf->packet_size_left < FRAME_HEADER_SIZE

  1022. 	    || asf->packet_segments < 1) {

  1023. 	    //asf->packet_size_left <= asf->packet_padsize) {

  1024. 	    int ret = asf->packet_size_left + asf->packet_padsize;

  1025. 	    //printf("PacketLeftSize:%d  Pad:%d Pos:%Ld\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));

  1026. 	    /* fail safe */

  1027. 	    url_fskip(pb, ret);

  1028. 	    ret = asf_get_packet(s);

  1029. 	    //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);

  1030. 	    if (ret < 0 || url_feof(pb))

  1031. 		return -EIO;

  1032.             asf->packet_time_start = 0;

  1033.             continue;

  1034. 	}

  1035. 	if (asf->packet_time_start == 0) {

  1036. 	    /* read frame header */

  1037.             int num = get_byte(pb);

  1038. 	    asf->packet_segments--;

  1039. 	    rsize++;

  1040. 	    asf->packet_key_frame = (num & 0x80) >> 7;

  1041. 	    asf->stream_index = asf->asfid2avid[num & 0x7f];

  1042. 	    // sequence should be ignored!

  1043. 	    DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);

  1044. 	    DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);

  1045. 	    DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);

  1046. 

  1047. 	    if (asf->packet_replic_size > 1) {

  1048.                 // it should be always at least 8 bytes - FIXME validate

  1049. 		asf->packet_obj_size = get_le32(pb);

  1050. 		asf->packet_frag_timestamp = get_le32(pb); // timestamp

  1051. 		if (asf->packet_replic_size > 8)

  1052. 		    url_fskip(pb, asf->packet_replic_size - 8);

  1053. 		rsize += asf->packet_replic_size; // FIXME - check validity

  1054. 	    } else {

  1055. 		// multipacket - frag_offset is begining timestamp

  1056. 		asf->packet_time_start = asf->packet_frag_offset;

  1057.                 asf->packet_frag_offset = 0;

  1058. 		asf->packet_frag_timestamp = asf->packet_timestamp;

  1059. 

  1060. 		if (asf->packet_replic_size == 1) {

  1061. 		    asf->packet_time_delta = get_byte(pb);

  1062. 		    rsize++;

  1063. 		}

  1064. 	    }

  1065. 	    if (asf->packet_flags & 0x01) {

  1066. 		DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal

  1067. #undef DO_2BITS

  1068. 		//printf("Fragsize %d\n", asf->packet_frag_size);

  1069. 	    } else {

  1070. 		asf->packet_frag_size = asf->packet_size_left - rsize;

  1071. 		//printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);

  1072. 	    }

  1073. 	    if (asf->packet_replic_size == 1) {

  1074. 		asf->packet_multi_size = asf->packet_frag_size;

  1075. 		if (asf->packet_multi_size > asf->packet_size_left) {

  1076. 		    asf->packet_segments = 0;

  1077.                     continue;

  1078. 		}

  1079. 	    }

  1080. 	    asf->packet_size_left -= rsize;

  1081. 	    //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);

  1082. 

  1083. 	    if (asf->stream_index < 0) {

  1084.                 asf->packet_time_start = 0;

  1085. 		/* unhandled packet (should not happen) */

  1086. 		url_fskip(pb, asf->packet_frag_size);

  1087. 		asf->packet_size_left -= asf->packet_frag_size;

  1088. 		printf("ff asf skip %d  %d\n", asf->packet_frag_size, num & 0x7f);

  1089.                 continue;

  1090. 	    }

  1091. 	    asf->asf_st = s->streams[asf->stream_index]->priv_data;

  1092. 	}

  1093. 	asf_st = asf->asf_st;

  1094. 

  1095. 	if ((asf->packet_frag_offset != asf_st->frag_offset

  1096. 	     || (asf->packet_frag_offset

  1097. 		 && asf->packet_seq != asf_st->seq)) // seq should be ignored

  1098. 	   ) {

  1099. 	    /* cannot continue current packet: free it */

  1100. 	    // FIXME better check if packet was already allocated

  1101. 	    printf("ff asf parser skips: %d - %d     o:%d - %d    %d %d   fl:%d\n",

  1102. 		   asf_st->pkt.size,

  1103. 		   asf->packet_obj_size,

  1104. 		   asf->packet_frag_offset, asf_st->frag_offset,

  1105. 		   asf->packet_seq, asf_st->seq, asf->packet_frag_size);

  1106. 	    if (asf_st->pkt.size)

  1107. 		av_free_packet(&asf_st->pkt);

  1108. 	    asf_st->frag_offset = 0;

  1109. 	    if (asf->packet_frag_offset != 0) {

  1110. 		url_fskip(pb, asf->packet_frag_size);

  1111. 		printf("ff asf parser skiping %db\n", asf->packet_frag_size);

  1112. 		asf->packet_size_left -= asf->packet_frag_size;

  1113. 		continue;

  1114. 	    }

  1115. 	}

  1116. 	if (asf->packet_replic_size == 1) {

  1117. 	    // frag_offset is here used as the begining timestamp

  1118. 	    asf->packet_frag_timestamp = asf->packet_time_start;

  1119. 	    asf->packet_time_start += asf->packet_time_delta;

  1120. 	    asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);

  1121. 	    asf->packet_size_left--;

  1122.             asf->packet_multi_size--;

  1123. 	    if (asf->packet_multi_size < asf->packet_obj_size)

  1124. 	    {

  1125. 		asf->packet_time_start = 0;

  1126. 		url_fskip(pb, asf->packet_multi_size);

  1127. 		asf->packet_size_left -= asf->packet_multi_size;

  1128.                 continue;

  1129. 	    }

  1130. 	    asf->packet_multi_size -= asf->packet_obj_size;

  1131. 	    //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);

  1132. 	}

  1133. 	if (asf_st->frag_offset == 0) {

  1134. 	    /* new packet */

  1135. 	    av_new_packet(&asf_st->pkt, asf->packet_obj_size);

  1136. 	    asf_st->seq = asf->packet_seq;

  1137. 	    asf_st->pkt.pts = asf->packet_frag_timestamp - asf->hdr.preroll;

  1138. 	    asf_st->pkt.stream_index = asf->stream_index;

  1139. 	    if (asf->packet_key_frame)

  1140. 		asf_st->pkt.flags |= PKT_FLAG_KEY;

  1141. 	}

  1142. 

  1143. 	/* read data */

  1144. 	//printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",

  1145. 	//       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,

  1146. 	//       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);

  1147. 	asf->packet_size_left -= asf->packet_frag_size;

  1148. 	if (asf->packet_size_left < 0)

  1149.             continue;

  1150. 	get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,

  1151. 		   asf->packet_frag_size);

  1152. 	asf_st->frag_offset += asf->packet_frag_size;

  1153. 	/* test if whole packet is read */

  1154. 	if (asf_st->frag_offset == asf_st->pkt.size) {

  1155. 	    /* return packet */

  1156. 	    if (asf_st->ds_span > 1) {

  1157. 		/* packet descrambling */

  1158. 		char* newdata = av_malloc(asf_st->pkt.size);

  1159. 		if (newdata) {

  1160. 		    int offset = 0;

  1161. 		    while (offset < asf_st->pkt.size) {

  1162. 			int off = offset / asf_st->ds_chunk_size;

  1163. 			int row = off / asf_st->ds_span;

  1164. 			int col = off % asf_st->ds_span;

  1165. 			int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;

  1166. 			//printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);

  1167. 			memcpy(newdata + offset,

  1168. 			       asf_st->pkt.data + idx * asf_st->ds_chunk_size,

  1169. 			       asf_st->ds_chunk_size);

  1170. 			offset += asf_st->ds_chunk_size;

  1171. 		    }

  1172. 		    av_free(asf_st->pkt.data);

  1173. 		    asf_st->pkt.data = newdata;

  1174. 		}

  1175. 	    }

  1176. 	    asf_st->frag_offset = 0;

  1177. 	    memcpy(pkt, &asf_st->pkt, sizeof(AVPacket));

  1178. 	    //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);

  1179. 	    asf_st->pkt.size = 0;

  1180. 	    asf_st->pkt.data = 0;

  1181. 	    break; // packet completed

  1182. 	}

  1183.     }

  1184.     return 0;

  1185. }

  1186. 

  1187. static int asf_read_close(AVFormatContext *s)

  1188. {

  1189.     int i;

  1190. 

  1191.     for(i=0;i<s->nb_streams;i++) {

  1192. 	AVStream *st = s->streams[i];

  1193. 	av_free(st->priv_data);

  1194. 	av_free(st->codec.extradata);

  1195.     }

  1196.     return 0;

  1197. }

  1198. 

  1199. static int asf_read_seek(AVFormatContext *s, int64_t pts)

  1200. {

  1201.     printf("SEEK TO %Ld", pts);

  1202.     return -1;

  1203. }

  1204. 

  1205. static AVInputFormat asf_iformat = {

  1206.     "asf",

  1207.     "asf format",

  1208.     sizeof(ASFContext),

  1209.     asf_probe,

  1210.     asf_read_header,

  1211.     asf_read_packet,

  1212.     asf_read_close,

  1213.     asf_read_seek,

  1214. };

  1215. 

  1216. static AVOutputFormat asf_oformat = {

  1217.     "asf",

  1218.     "asf format",

  1219.     "application/octet-stream",

  1220.     "asf,wmv",

  1221.     sizeof(ASFContext),

  1222. #ifdef CONFIG_MP3LAME

  1223.     CODEC_ID_MP3LAME,

  1224. #else

  1225.     CODEC_ID_MP2,

  1226. #endif

  1227.     CODEC_ID_MSMPEG4V3,

  1228.     asf_write_header,

  1229.     asf_write_packet,

  1230.     asf_write_trailer,

  1231. };

  1232. 

  1233. static AVOutputFormat asf_stream_oformat = {

  1234.     "asf_stream",

  1235.     "asf format",

  1236.     "application/octet-stream",

  1237.     "asf,wmv",

  1238.     sizeof(ASFContext),

  1239. #ifdef CONFIG_MP3LAME

  1240.     CODEC_ID_MP3LAME,

  1241. #else

  1242.     CODEC_ID_MP2,

  1243. #endif

  1244.     CODEC_ID_MSMPEG4V3,

  1245.     asf_write_stream_header,

  1246.     asf_write_packet,

  1247.     asf_write_trailer,

  1248. };

  1249. 

  1250. int asf_init(void)

  1251. {

  1252.     av_register_input_format(&asf_iformat);

  1253.     av_register_output_format(&asf_oformat);

  1254.     av_register_output_format(&asf_stream_oformat);

  1255.     return 0;

  1256. }