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FFmpeg/libavformat/asfdec.c

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  1. /*

  2.  * ASF compatible demuxer

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

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

  7.  * FFmpeg is free software; you can redistribute it and/or

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

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

  10.  * version 2.1 of the License, or (at your option) any later version.

  11.  *

  12.  * FFmpeg is distributed in the hope that it will be useful,

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

  18.  * License along with FFmpeg; if not, write to the Free Software

  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  20.  */

  21. 

  22. #include "libavutil/common.h"

  23. #include "libavutil/avstring.h"

  24. #include "libavcodec/mpegaudio.h"

  25. #include "avformat.h"

  26. #include "riff.h"

  27. #include "asf.h"

  28. #include "asfcrypt.h"

  29. #include "avlanguage.h"

  30. 

  31. void ff_mms_set_stream_selection(URLContext *h, AVFormatContext *format);

  32. 

  33. #undef NDEBUG

  34. #include <assert.h>

  35. 

  36. #define FRAME_HEADER_SIZE 17

  37. // Fix Me! FRAME_HEADER_SIZE may be different.

  38. 

  39. static const ff_asf_guid index_guid = {

  40.     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb

  41. };

  42. 

  43. static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */

  44.     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2

  45. };

  46. /**********************************/

  47. /* decoding */

  48. 

  49. //#define DEBUG

  50. 

  51. #ifdef DEBUG

  52. #define PRINT_IF_GUID(g,cmp) \

  53. if (!guidcmp(g, &cmp)) \

  54.     dprintf(NULL, "(GUID: %s) ", #cmp)

  55. 

  56. static void print_guid(const ff_asf_guid *g)

  57. {

  58.     int i;

  59.     PRINT_IF_GUID(g, ff_asf_header);

  60.     else PRINT_IF_GUID(g, ff_asf_file_header);

  61.     else PRINT_IF_GUID(g, ff_asf_stream_header);

  62.     else PRINT_IF_GUID(g, ff_asf_audio_stream);

  63.     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);

  64.     else PRINT_IF_GUID(g, ff_asf_video_stream);

  65.     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);

  66.     else PRINT_IF_GUID(g, ff_asf_command_stream);

  67.     else PRINT_IF_GUID(g, ff_asf_comment_header);

  68.     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);

  69.     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);

  70.     else PRINT_IF_GUID(g, ff_asf_data_header);

  71.     else PRINT_IF_GUID(g, index_guid);

  72.     else PRINT_IF_GUID(g, ff_asf_head1_guid);

  73.     else PRINT_IF_GUID(g, ff_asf_head2_guid);

  74.     else PRINT_IF_GUID(g, ff_asf_my_guid);

  75.     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);

  76.     else PRINT_IF_GUID(g, ff_asf_extended_content_header);

  77.     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);

  78.     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);

  79.     else PRINT_IF_GUID(g, ff_asf_metadata_header);

  80.     else PRINT_IF_GUID(g, stream_bitrate_guid);

  81.     else PRINT_IF_GUID(g, ff_asf_language_guid);

  82.     else

  83.         dprintf(NULL, "(GUID: unknown) ");

  84.     for(i=0;i<16;i++)

  85.         dprintf(NULL, " 0x%02x,", (*g)[i]);

  86.     dprintf(NULL, "}\n");

  87. }

  88. #undef PRINT_IF_GUID

  89. #else

  90. #define print_guid(g)

  91. #endif

  92. 

  93. static int guidcmp(const void *g1, const void *g2)

  94. {

  95.     return memcmp(g1, g2, sizeof(ff_asf_guid));

  96. }

  97. 

  98. static void get_guid(ByteIOContext *s, ff_asf_guid *g)

  99. {

  100.     assert(sizeof(*g) == 16);

  101.     get_buffer(s, *g, sizeof(*g));

  102. }

  103. 

  104. #if 0

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

  106. {

  107.     int len, c;

  108.     char *q;

  109. 

  110.     len = get_le16(pb);

  111.     q = buf;

  112.     while (len > 0) {

  113.         c = get_le16(pb);

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

  115.             *q++ = c;

  116.         len--;

  117.     }

  118.     *q = '\0';

  119. }

  120. #endif

  121. 

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

  123. {

  124.     char* q = buf;

  125.     len /= 2;

  126.     while (len--) {

  127.         uint8_t tmp;

  128.         PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)

  129.     }

  130.     *q = '\0';

  131. }

  132. 

  133. static int asf_probe(AVProbeData *pd)

  134. {

  135.     /* check file header */

  136.     if (!guidcmp(pd->buf, &ff_asf_header))

  137.         return AVPROBE_SCORE_MAX;

  138.     else

  139.         return 0;

  140. }

  141. 

  142. static int get_value(ByteIOContext *pb, int type){

  143.     switch(type){

  144.         case 2: return get_le32(pb);

  145.         case 3: return get_le32(pb);

  146.         case 4: return get_le64(pb);

  147.         case 5: return get_le16(pb);

  148.         default:return INT_MIN;

  149.     }

  150. }

  151. 

  152. static void get_tag(AVFormatContext *s, const char *key, int type, int len)

  153. {

  154.     char value[1024];

  155.     if (type <= 1) {         // unicode or byte

  156.         get_str16_nolen(s->pb, len, value, sizeof(value));

  157.     } else if (type <= 5) {  // boolean or DWORD or QWORD or WORD

  158.         uint64_t num = get_value(s->pb, type);

  159.         snprintf(value, sizeof(value), "%"PRIu64, num);

  160.     } else {

  161.         url_fskip(s->pb, len);

  162.         return;

  163.     }

  164.     if (!strncmp(key, "WM/", 3))

  165.         key += 3;

  166.     av_metadata_set(&s->metadata, key, value);

  167. }

  168. 

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

  170. {

  171.     ASFContext *asf = s->priv_data;

  172.     ff_asf_guid g;

  173.     ByteIOContext *pb = s->pb;

  174.     AVStream *st;

  175.     ASFStream *asf_st;

  176.     int size, i;

  177.     int64_t gsize;

  178.     AVRational dar[128];

  179.     uint32_t bitrate[128];

  180. 

  181.     memset(dar, 0, sizeof(dar));

  182.     memset(bitrate, 0, sizeof(bitrate));

  183. 

  184.     get_guid(pb, &g);

  185.     if (guidcmp(&g, &ff_asf_header))

  186.         return -1;

  187.     get_le64(pb);

  188.     get_le32(pb);

  189.     get_byte(pb);

  190.     get_byte(pb);

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

  192.     for(;;) {

  193.         get_guid(pb, &g);

  194.         gsize = get_le64(pb);

  195.         dprintf(s, "%08"PRIx64": ", url_ftell(pb) - 24);

  196.         print_guid(&g);

  197.         dprintf(s, "  size=0x%"PRIx64"\n", gsize);

  198.         if (!guidcmp(&g, &ff_asf_data_header)) {

  199.             asf->data_object_offset = url_ftell(pb);

  200.             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..

  201.             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {

  202.                 asf->data_object_size = gsize - 24;

  203.             } else {

  204.                 asf->data_object_size = (uint64_t)-1;

  205.             }

  206.             break;

  207.         }

  208.         if (gsize < 24)

  209.             return -1;

  210.         if (!guidcmp(&g, &ff_asf_file_header)) {

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

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

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

  214.             asf->nb_packets             = get_le64(pb);

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

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

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

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

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

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

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

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

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

  224.         } else if (!guidcmp(&g, &ff_asf_stream_header)) {

  225.             enum CodecType type;

  226.             int type_specific_size, sizeX;

  227.             uint64_t total_size;

  228.             unsigned int tag1;

  229.             int64_t pos1, pos2, start_time;

  230.             int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  231. 

  232.             pos1 = url_ftell(pb);

  233. 

  234.             st = av_new_stream(s, 0);

  235.             if (!st)

  236.                 return AVERROR(ENOMEM);

  237.             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */

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

  239.             if (!asf_st)

  240.                 return AVERROR(ENOMEM);

  241.             st->priv_data = asf_st;

  242.             start_time = asf->hdr.preroll;

  243. 

  244.             asf_st->stream_language_index = 128; // invalid stream index means no language info

  245. 

  246.             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...

  247.                 st->duration = asf->hdr.send_time /

  248.                     (10000000 / 1000) - start_time;

  249.             }

  250.             get_guid(pb, &g);

  251. 

  252.             test_for_ext_stream_audio = 0;

  253.             if (!guidcmp(&g, &ff_asf_audio_stream)) {

  254.                 type = CODEC_TYPE_AUDIO;

  255.             } else if (!guidcmp(&g, &ff_asf_video_stream)) {

  256.                 type = CODEC_TYPE_VIDEO;

  257.             } else if (!guidcmp(&g, &ff_asf_command_stream)) {

  258.                 type = CODEC_TYPE_DATA;

  259.             } else if (!guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {

  260.                 test_for_ext_stream_audio = 1;

  261.                 type = CODEC_TYPE_UNKNOWN;

  262.             } else {

  263.                 return -1;

  264.             }

  265.             get_guid(pb, &g);

  266.             total_size = get_le64(pb);

  267.             type_specific_size = get_le32(pb);

  268.             get_le32(pb);

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

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

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

  272. 

  273.             get_le32(pb);

  274. 

  275.             if (test_for_ext_stream_audio) {

  276.                 get_guid(pb, &g);

  277.                 if (!guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {

  278.                     type = CODEC_TYPE_AUDIO;

  279.                     is_dvr_ms_audio=1;

  280.                     get_guid(pb, &g);

  281.                     get_le32(pb);

  282.                     get_le32(pb);

  283.                     get_le32(pb);

  284.                     get_guid(pb, &g);

  285.                     get_le32(pb);

  286.                 }

  287.             }

  288. 

  289.             st->codec->codec_type = type;

  290.             if (type == CODEC_TYPE_AUDIO) {

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

  292.                 if (is_dvr_ms_audio) {

  293.                     // codec_id and codec_tag are unreliable in dvr_ms

  294.                     // files. Set them later by probing stream.

  295.                     st->codec->codec_id = CODEC_ID_PROBE;

  296.                     st->codec->codec_tag = 0;

  297.                 }

  298.                 if (st->codec->codec_id == CODEC_ID_AAC) {

  299.                     st->need_parsing = AVSTREAM_PARSE_NONE;

  300.                 } else {

  301.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  302.                 }

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

  304.                 pos2 = url_ftell(pb);

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

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

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

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

  309.                     get_le16(pb); //ds_data_size

  310.                     get_byte(pb); //ds_silence_data

  311.                 }

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

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

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

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

  316.                     if (!asf_st->ds_chunk_size

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

  318.                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)

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

  320.                 }

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

  322.                 case CODEC_ID_MP3:

  323.                     st->codec->frame_size = MPA_FRAME_SIZE;

  324.                     break;

  325.                 case CODEC_ID_PCM_S16LE:

  326.                 case CODEC_ID_PCM_S16BE:

  327.                 case CODEC_ID_PCM_U16LE:

  328.                 case CODEC_ID_PCM_U16BE:

  329.                 case CODEC_ID_PCM_S8:

  330.                 case CODEC_ID_PCM_U8:

  331.                 case CODEC_ID_PCM_ALAW:

  332.                 case CODEC_ID_PCM_MULAW:

  333.                     st->codec->frame_size = 1;

  334.                     break;

  335.                 default:

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

  337.                     st->codec->frame_size = 1;

  338.                     break;

  339.                 }

  340.             } else if (type == CODEC_TYPE_VIDEO) {

  341.                 get_le32(pb);

  342.                 get_le32(pb);

  343.                 get_byte(pb);

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

  345.                 sizeX= get_le32(pb); /* size */

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

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

  348.                 /* not available for asf */

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

  350.                 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */

  351.                 tag1 = get_le32(pb);

  352.                 url_fskip(pb, 20);

  353. //                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);

  354.                 size= sizeX;

  355.                 if (size > 40) {

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

  357.                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

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

  359.                 }

  360. 

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

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

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

  364.                 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {

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

  366. #ifdef WORDS_BIGENDIAN

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

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

  369. #else

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

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

  372. #endif

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

  374.                 }

  375. 

  376.                 st->codec->codec_tag = tag1;

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

  378.                 if(tag1 == MKTAG('D', 'V', 'R', ' '))

  379.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  380.             }

  381.             pos2 = url_ftell(pb);

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

  383.         } else if (!guidcmp(&g, &ff_asf_comment_header)) {

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

  385. 

  386.             len1 = get_le16(pb);

  387.             len2 = get_le16(pb);

  388.             len3 = get_le16(pb);

  389.             len4 = get_le16(pb);

  390.             len5 = get_le16(pb);

  391.             get_tag(s, "title"    , 0, len1);

  392.             get_tag(s, "author"   , 0, len2);

  393.             get_tag(s, "copyright", 0, len3);

  394.             get_tag(s, "comment"  , 0, len4);

  395.             url_fskip(pb, len5);

  396.         } else if (!guidcmp(&g, &stream_bitrate_guid)) {

  397.             int stream_count = get_le16(pb);

  398.             int j;

  399. 

  400. //            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");

  401. //            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);

  402.             for(j = 0; j < stream_count; j++) {

  403.                 int flags, bitrate, stream_id;

  404. 

  405.                 flags= get_le16(pb);

  406.                 bitrate= get_le32(pb);

  407.                 stream_id= (flags & 0x7f);

  408. //                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);

  409.                 asf->stream_bitrates[stream_id]= bitrate;

  410.             }

  411.         } else if (!guidcmp(&g, &ff_asf_language_guid)) {

  412.             int j;

  413.             int stream_count = get_le16(pb);

  414.             for(j = 0; j < stream_count; j++) {

  415.                 char lang[6];

  416.                 unsigned int lang_len = get_byte(pb);

  417.                 get_str16_nolen(pb, lang_len, lang, sizeof(lang));

  418.                 if (j < 128)

  419.                     av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));

  420.             }

  421.         } else if (!guidcmp(&g, &ff_asf_extended_content_header)) {

  422.             int desc_count, i;

  423. 

  424.             desc_count = get_le16(pb);

  425.             for(i=0;i<desc_count;i++) {

  426.                     int name_len,value_type,value_len;

  427.                     char name[1024];

  428. 

  429.                     name_len = get_le16(pb);

  430.                     get_str16_nolen(pb, name_len, name, sizeof(name));

  431.                     value_type = get_le16(pb);

  432.                     value_len  = get_le16(pb);

  433.                     get_tag(s, name, value_type, value_len);

  434.             }

  435.         } else if (!guidcmp(&g, &ff_asf_metadata_header)) {

  436.             int n, stream_num, name_len, value_len, value_type, value_num;

  437.             n = get_le16(pb);

  438. 

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

  440.                 char name[1024];

  441. 

  442.                 get_le16(pb); //lang_list_index

  443.                 stream_num= get_le16(pb);

  444.                 name_len=   get_le16(pb);

  445.                 value_type= get_le16(pb);

  446.                 value_len=  get_le32(pb);

  447. 

  448.                 get_str16_nolen(pb, name_len, name, sizeof(name));

  449. //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);

  450.                 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere

  451.                 url_fskip(pb, value_len - 2);

  452. 

  453.                 if(stream_num<128){

  454.                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;

  455.                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;

  456.                 }

  457.             }

  458.         } else if (!guidcmp(&g, &ff_asf_ext_stream_header)) {

  459.             int ext_len, payload_ext_ct, stream_ct;

  460.             uint32_t ext_d, leak_rate, stream_num;

  461.             unsigned int stream_languageid_index;

  462. 

  463.             get_le64(pb); // starttime

  464.             get_le64(pb); // endtime

  465.             leak_rate = get_le32(pb); // leak-datarate

  466.             get_le32(pb); // bucket-datasize

  467.             get_le32(pb); // init-bucket-fullness

  468.             get_le32(pb); // alt-leak-datarate

  469.             get_le32(pb); // alt-bucket-datasize

  470.             get_le32(pb); // alt-init-bucket-fullness

  471.             get_le32(pb); // max-object-size

  472.             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)

  473.             stream_num = get_le16(pb); // stream-num

  474. 

  475.             stream_languageid_index = get_le16(pb); // stream-language-id-index

  476.             if (stream_num < 128)

  477.                 asf->streams[stream_num].stream_language_index = stream_languageid_index;

  478. 

  479.             get_le64(pb); // avg frametime in 100ns units

  480.             stream_ct = get_le16(pb); //stream-name-count

  481.             payload_ext_ct = get_le16(pb); //payload-extension-system-count

  482. 

  483.             if (stream_num < 128)

  484.                 bitrate[stream_num] = leak_rate;

  485. 

  486.             for (i=0; i<stream_ct; i++){

  487.                 get_le16(pb);

  488.                 ext_len = get_le16(pb);

  489.                 url_fseek(pb, ext_len, SEEK_CUR);

  490.             }

  491. 

  492.             for (i=0; i<payload_ext_ct; i++){

  493.                 get_guid(pb, &g);

  494.                 ext_d=get_le16(pb);

  495.                 ext_len=get_le32(pb);

  496.                 url_fseek(pb, ext_len, SEEK_CUR);

  497.             }

  498. 

  499.             // there could be a optional stream properties object to follow

  500.             // if so the next iteration will pick it up

  501.         } else if (!guidcmp(&g, &ff_asf_head1_guid)) {

  502.             int v1, v2;

  503.             get_guid(pb, &g);

  504.             v1 = get_le32(pb);

  505.             v2 = get_le16(pb);

  506. #if 0

  507.         } else if (!guidcmp(&g, &ff_asf_codec_comment_header)) {

  508.             int len, v1, n, num;

  509.             char str[256], *q;

  510.             char tag[16];

  511. 

  512.             get_guid(pb, &g);

  513.             print_guid(&g);

  514. 

  515.             n = get_le32(pb);

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

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

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

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

  520.                 len = get_le16(pb);

  521.                 q = tag;

  522.                 while (len > 0) {

  523.                     v1 = get_byte(pb);

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

  525.                         *q++ = v1;

  526.                     len--;

  527.                 }

  528.                 *q = '\0';

  529.             }

  530. #endif

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

  532.             return -1;

  533.         } else {

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

  535.         }

  536.     }

  537.     get_guid(pb, &g);

  538.     get_le64(pb);

  539.     get_byte(pb);

  540.     get_byte(pb);

  541.     if (url_feof(pb))

  542.         return -1;

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

  544.     asf->packet_size_left = 0;

  545. 

  546. 

  547.     for(i=0; i<128; i++){

  548.         int stream_num= asf->asfid2avid[i];

  549.         if(stream_num>=0){

  550.             AVStream *st = s->streams[stream_num];

  551.             if (!st->codec->bit_rate)

  552.                 st->codec->bit_rate = bitrate[i];

  553.             if (dar[i].num > 0 && dar[i].den > 0)

  554.                 av_reduce(&st->sample_aspect_ratio.num,

  555.                           &st->sample_aspect_ratio.den,

  556.                           dar[i].num, dar[i].den, INT_MAX);

  557. //av_log(s, AV_LOG_ERROR, "dar %d:%d sar=%d:%d\n", dar[i].num, dar[i].den, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);

  558. 

  559.             // copy and convert language codes to the frontend

  560.             if (asf->streams[i].stream_language_index < 128) {

  561.                 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];

  562.                 if (rfc1766 && strlen(rfc1766) > 1) {

  563.                     const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any

  564.                     const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);

  565.                     if (iso6392)

  566.                         av_metadata_set(&st->metadata, "language", iso6392);

  567.                 }

  568.             }

  569.         }

  570.     }

  571. 

  572.     return 0;

  573. }

  574. 

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

  576.     switch (bits & 3) \

  577.     { \

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

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

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

  581.     default: var = defval; break; \

  582.     }

  583. 

  584. int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)

  585. {

  586.     ASFContext *asf = s->priv_data;

  587.     uint32_t packet_length, padsize;

  588.     int rsize = 8;

  589.     int c, d, e, off;

  590. 

  591.     off= (url_ftell(pb) - s->data_offset) % asf->packet_size + 3;

  592. 

  593.     c=d=e=-1;

  594.     while(off-- > 0){

  595.         c=d; d=e;

  596.         e= get_byte(pb);

  597.         if(c == 0x82 && !d && !e)

  598.             break;

  599.     }

  600. 

  601.     if (c != 0x82) {

  602.         if (!url_feof(pb))

  603.             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));

  604.     }

  605.     if ((c & 0x8f) == 0x82) {

  606.         if (d || e) {

  607.             if (!url_feof(pb))

  608.                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");

  609.             return -1;

  610.         }

  611.         c= get_byte(pb);

  612.         d= get_byte(pb);

  613.         rsize+=3;

  614.     }else{

  615.         url_fseek(pb, -1, SEEK_CUR); //FIXME

  616.     }

  617. 

  618.     asf->packet_flags    = c;

  619.     asf->packet_property = d;

  620. 

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

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

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

  624. 

  625.     //the following checks prevent overflows and infinite loops

  626.     if(packet_length >= (1U<<29)){

  627.         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));

  628.         return -1;

  629.     }

  630.     if(padsize >= packet_length){

  631.         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));

  632.         return -1;

  633.     }

  634. 

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

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

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

  638. 

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

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

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

  642.     } else {

  643.         asf->packet_segments = 1;

  644.         asf->packet_segsizetype = 0x80;

  645.     }

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

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

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

  649.     asf->packet_padsize = padsize;

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

  651.     return 0;

  652. }

  653. 

  654. /**

  655.  *

  656.  * @return <0 if error

  657.  */

  658. static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){

  659.     ASFContext *asf = s->priv_data;

  660.     int rsize = 1;

  661.     int num = get_byte(pb);

  662.     int64_t ts0, ts1;

  663. 

  664.     asf->packet_segments--;

  665.     asf->packet_key_frame = num >> 7;

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

  667.     // sequence should be ignored!

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

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

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

  671. //printf("key:%d stream:%d seq:%d offset:%d replic_size:%d\n", asf->packet_key_frame, asf->stream_index, asf->packet_seq, //asf->packet_frag_offset, asf->packet_replic_size);

  672.     if (asf->packet_replic_size >= 8) {

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

  674.         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){

  675.             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");

  676.             return -1;

  677.         }

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

  679.         if(asf->packet_replic_size >= 8+38+4){

  680. //            for(i=0; i<asf->packet_replic_size-8; i++)

  681. //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));

  682. //            av_log(s, AV_LOG_DEBUG, "\n");

  683.             url_fskip(pb, 10);

  684.             ts0= get_le64(pb);

  685.             ts1= get_le64(pb);

  686.             url_fskip(pb, 12);

  687.             get_le32(pb);

  688.             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);

  689.             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;

  690.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  691.         }else

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

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

  694.     } else if (asf->packet_replic_size==1){

  695.         // multipacket - frag_offset is beginning timestamp

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

  697.         asf->packet_frag_offset = 0;

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

  699. 

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

  701.         rsize++;

  702.     }else if(asf->packet_replic_size!=0){

  703.         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);

  704.         return -1;

  705.     }

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

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

  708.         if(asf->packet_frag_size > asf->packet_size_left - rsize){

  709.             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");

  710.             return -1;

  711.         }

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

  713.     } else {

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

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

  716.     }

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

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

  719.         if (asf->packet_multi_size > asf->packet_size_left)

  720.             return -1;

  721.     }

  722.     asf->packet_size_left -= rsize;

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

  724. 

  725.     return 0;

  726. }

  727. 

  728. int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)

  729. {

  730.     ASFContext *asf = s->priv_data;

  731.     ASFStream *asf_st = 0;

  732.     for (;;) {

  733.         if(url_feof(pb))

  734.             return AVERROR_EOF;

  735.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

  739.             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));

  740.             assert(ret>=0);

  741.             /* fail safe */

  742.             url_fskip(pb, ret);

  743. 

  744.             asf->packet_pos= url_ftell(pb);

  745.             if (asf->data_object_size != (uint64_t)-1 &&

  746.                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))

  747.                 return AVERROR_EOF; /* Do not exceed the size of the data object */

  748.             return 1;

  749.         }

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

  751.             if(asf_read_frame_header(s, pb) < 0){

  752.                 asf->packet_segments= 0;

  753.                 continue;

  754.             }

  755.             if (asf->stream_index < 0

  756.                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL

  757.                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)

  758.                 ) {

  759.                 asf->packet_time_start = 0;

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

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

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

  763.                 if(asf->stream_index < 0)

  764.                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);

  765.                 continue;

  766.             }

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

  768.         }

  769.         asf_st = asf->asf_st;

  770. 

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

  772.             // frag_offset is here used as the beginning timestamp

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

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

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

  776.             asf->packet_size_left--;

  777.             asf->packet_multi_size--;

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

  779.             {

  780.                 asf->packet_time_start = 0;

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

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

  783.                 continue;

  784.             }

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

  786.             //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);

  787.         }

  788.         if(   /*asf->packet_frag_size == asf->packet_obj_size*/

  789.               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size

  790.            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){

  791.             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",

  792.                 asf_st->frag_offset, asf->packet_frag_size,

  793.                 asf->packet_obj_size, asf_st->pkt.size);

  794.             asf->packet_obj_size= asf_st->pkt.size;

  795.         }

  796. 

  797.         if (   asf_st->pkt.size != asf->packet_obj_size

  798.             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?

  799.             if(asf_st->pkt.data){

  800.                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);

  801.                 asf_st->frag_offset = 0;

  802.                 av_free_packet(&asf_st->pkt);

  803.             }

  804.             /* new packet */

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

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

  807.             asf_st->pkt.dts = asf->packet_frag_timestamp;

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

  809.             asf_st->pkt.pos =

  810.             asf_st->packet_pos= asf->packet_pos;

  811. //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",

  812. //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,

  813. //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);

  814.             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)

  815.                 asf->packet_key_frame = 1;

  816.             if (asf->packet_key_frame)

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

  818.         }

  819. 

  820.         /* read data */

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

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

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

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

  825.         if (asf->packet_size_left < 0)

  826.             continue;

  827. 

  828.         if(   asf->packet_frag_offset >= asf_st->pkt.size

  829.            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){

  830.             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",

  831.                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);

  832.             continue;

  833.         }

  834. 

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

  836.                    asf->packet_frag_size);

  837.         if (s->key && s->keylen == 20)

  838.             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,

  839.                             asf->packet_frag_size);

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

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

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

  843.             //workaround for macroshit radio DVR-MS files

  844.             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO

  845.                && asf_st->pkt.size > 100){

  846.                 int i;

  847.                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);

  848.                 if(i == asf_st->pkt.size){

  849.                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");

  850.                     asf_st->frag_offset = 0;

  851.                     av_free_packet(&asf_st->pkt);

  852.                     continue;

  853.                 }

  854.             }

  855. 

  856.             /* return packet */

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

  858.               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){

  859.                     av_log(s, AV_LOG_ERROR, "pkt.size != ds_packet_size * ds_span (%d %d %d)\n", asf_st->pkt.size, asf_st->ds_packet_size, asf_st->ds_span);

  860.               }else{

  861.                 /* packet descrambling */

  862.                 uint8_t *newdata = av_malloc(asf_st->pkt.size);

  863.                 if (newdata) {

  864.                     int offset = 0;

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

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

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

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

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

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

  871. 

  872.                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);

  873.                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);

  874.                         memcpy(newdata + offset,

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

  876.                                asf_st->ds_chunk_size);

  877.                         offset += asf_st->ds_chunk_size;

  878.                     }

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

  880.                     asf_st->pkt.data = newdata;

  881.                 }

  882.               }

  883.             }

  884.             asf_st->frag_offset = 0;

  885.             *pkt= asf_st->pkt;

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

  887.             asf_st->pkt.size = 0;

  888.             asf_st->pkt.data = 0;

  889.             break; // packet completed

  890.         }

  891.     }

  892.     return 0;

  893. }

  894. 

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

  896. {

  897.     ASFContext *asf = s->priv_data;

  898. 

  899.     for (;;) {

  900.         int ret;

  901. 

  902.         /* parse cached packets, if any */

  903.         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)

  904.             return ret;

  905.         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)

  906.             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);

  907.         asf->packet_time_start = 0;

  908.     }

  909. 

  910.     return 0;

  911. }

  912. 

  913. // Added to support seeking after packets have been read

  914. // If information is not reset, read_packet fails due to

  915. // leftover information from previous reads

  916. static void asf_reset_header(AVFormatContext *s)

  917. {

  918.     ASFContext *asf = s->priv_data;

  919.     ASFStream *asf_st;

  920.     int i;

  921. 

  922.     asf->packet_nb_frames = 0;

  923.     asf->packet_size_left = 0;

  924.     asf->packet_segments = 0;

  925.     asf->packet_flags = 0;

  926.     asf->packet_property = 0;

  927.     asf->packet_timestamp = 0;

  928.     asf->packet_segsizetype = 0;

  929.     asf->packet_segments = 0;

  930.     asf->packet_seq = 0;

  931.     asf->packet_replic_size = 0;

  932.     asf->packet_key_frame = 0;

  933.     asf->packet_padsize = 0;

  934.     asf->packet_frag_offset = 0;

  935.     asf->packet_frag_size = 0;

  936.     asf->packet_frag_timestamp = 0;

  937.     asf->packet_multi_size = 0;

  938.     asf->packet_obj_size = 0;

  939.     asf->packet_time_delta = 0;

  940.     asf->packet_time_start = 0;

  941. 

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

  943.         asf_st= s->streams[i]->priv_data;

  944.         av_free_packet(&asf_st->pkt);

  945.         asf_st->frag_offset=0;

  946.         asf_st->seq=0;

  947.     }

  948.     asf->asf_st= NULL;

  949. }

  950. 

  951. static int asf_read_close(AVFormatContext *s)

  952. {

  953.     int i;

  954. 

  955.     asf_reset_header(s);

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

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

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

  959.     }

  960.     return 0;

  961. }

  962. 

  963. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  964. {

  965.     ASFContext *asf = s->priv_data;

  966.     AVPacket pkt1, *pkt = &pkt1;

  967.     ASFStream *asf_st;

  968.     int64_t pts;

  969.     int64_t pos= *ppos;

  970.     int i;

  971.     int64_t start_pos[s->nb_streams];

  972. 

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

  974.         start_pos[i]= pos;

  975.     }

  976. 

  977.     pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;

  978.     *ppos= pos;

  979.     url_fseek(s->pb, pos, SEEK_SET);

  980. 

  981. //printf("asf_read_pts\n");

  982.     asf_reset_header(s);

  983.     for(;;){

  984.         if (av_read_frame(s, pkt) < 0){

  985.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  986.             return AV_NOPTS_VALUE;

  987.         }

  988. 

  989.         pts= pkt->pts;

  990. 

  991.         av_free_packet(pkt);

  992.         if(pkt->flags&PKT_FLAG_KEY){

  993.             i= pkt->stream_index;

  994. 

  995.             asf_st= s->streams[i]->priv_data;

  996. 

  997. //            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);

  998.             pos= asf_st->packet_pos;

  999. 

  1000.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1001.             start_pos[i]= asf_st->packet_pos + 1;

  1002. 

  1003.             if(pkt->stream_index == stream_index)

  1004.                break;

  1005.         }

  1006.     }

  1007. 

  1008.     *ppos= pos;

  1009. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1010. 

  1011.     return pts;

  1012. }

  1013. 

  1014. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1015. {

  1016.     ff_asf_guid g;

  1017.     ASFContext *asf = s->priv_data;

  1018.     int64_t current_pos= url_ftell(s->pb);

  1019.     int i;

  1020. 

  1021.     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);

  1022.     get_guid(s->pb, &g);

  1023.     if (!guidcmp(&g, &index_guid)) {

  1024.         int64_t itime;

  1025.         int pct, ict;

  1026.         int64_t av_unused gsize= get_le64(s->pb);

  1027.         get_guid(s->pb, &g);

  1028.         itime=get_le64(s->pb);

  1029.         pct=get_le32(s->pb);

  1030.         ict=get_le32(s->pb);

  1031.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1032. 

  1033.         for (i=0;i<ict;i++){

  1034.             int pktnum=get_le32(s->pb);

  1035.             int pktct =get_le16(s->pb);

  1036.             int64_t pos      = s->data_offset + asf->packet_size*(int64_t)pktnum;

  1037.             int64_t index_pts= av_rescale(itime, i, 10000);

  1038. 

  1039.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);

  1040.             av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);

  1041.         }

  1042.         asf->index_read= 1;

  1043.     }

  1044.     url_fseek(s->pb, current_pos, SEEK_SET);

  1045. }

  1046. 

  1047. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1048. {

  1049.     ASFContext *asf = s->priv_data;

  1050.     AVStream *st = s->streams[stream_index];

  1051.     int64_t pos;

  1052.     int index;

  1053. 

  1054.     if (asf->packet_size <= 0)

  1055.         return -1;

  1056. 

  1057.     /* Try using the protocol's read_seek if available */

  1058.     if(s->pb) {

  1059.         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);

  1060.         if(ret >= 0)

  1061.             asf_reset_header(s);

  1062.         if (ret != AVERROR(ENOSYS))

  1063.             return ret;

  1064.     }

  1065. 

  1066.     if (!asf->index_read)

  1067.         asf_build_simple_index(s, stream_index);

  1068. 

  1069.     if(!(asf->index_read && st->index_entries)){

  1070.         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)

  1071.             return -1;

  1072.     }else{

  1073.         index= av_index_search_timestamp(st, pts, flags);

  1074.         if(index<0)

  1075.             return -1;

  1076. 

  1077.         /* find the position */

  1078.         pos = st->index_entries[index].pos;

  1079. 

  1080.     // various attempts to find key frame have failed so far

  1081.     //    asf_reset_header(s);

  1082.     //    url_fseek(s->pb, pos, SEEK_SET);

  1083.     //    key_pos = pos;

  1084.     //     for(i=0;i<16;i++){

  1085.     //         pos = url_ftell(s->pb);

  1086.     //         if (av_read_frame(s, &pkt) < 0){

  1087.     //             av_log(s, AV_LOG_INFO, "seek failed\n");

  1088.     //             return -1;

  1089.     //         }

  1090.     //         asf_st = s->streams[stream_index]->priv_data;

  1091.     //         pos += st->parser->frame_offset;

  1092.     //

  1093.     //         if (pkt.size > b) {

  1094.     //             b = pkt.size;

  1095.     //             key_pos = pos;

  1096.     //         }

  1097.     //

  1098.     //         av_free_packet(&pkt);

  1099.     //     }

  1100. 

  1101.         /* do the seek */

  1102.         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1103.         url_fseek(s->pb, pos, SEEK_SET);

  1104.     }

  1105.     asf_reset_header(s);

  1106.     return 0;

  1107. }

  1108. 

  1109. AVInputFormat asf_demuxer = {

  1110.     "asf",

  1111.     NULL_IF_CONFIG_SMALL("ASF format"),

  1112.     sizeof(ASFContext),

  1113.     asf_probe,

  1114.     asf_read_header,

  1115.     asf_read_packet,

  1116.     asf_read_close,

  1117.     asf_read_seek,

  1118.     asf_read_pts,

  1119.     .metadata_conv = ff_asf_metadata_conv,

  1120. };