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FFmpeg/libavformat/asf.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. #include "avformat.h"

  22. #include "riff.h"

  23. #include "mpegaudio.h"

  24. #include "asf.h"

  25. #include "common.h"

  26. #include "asfcrypt.h"

  27. 

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

  29. 

  30. #undef NDEBUG

  31. #include <assert.h>

  32. 

  33. #define FRAME_HEADER_SIZE 17

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

  35. 

  36. static const GUID index_guid = {

  37.     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb

  38. };

  39. 

  40. static const GUID stream_bitrate_guid = { /* (http://get.to/sdp) */

  41.     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2

  42. };

  43. /**********************************/

  44. /* decoding */

  45. 

  46. //#define DEBUG

  47. 

  48. #ifdef DEBUG

  49. #define PRINT_IF_GUID(g,cmp) \

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

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

  52. 

  53. static void print_guid(const GUID *g)

  54. {

  55.     int i;

  56.     PRINT_IF_GUID(g, asf_header);

  57.     else PRINT_IF_GUID(g, file_header);

  58.     else PRINT_IF_GUID(g, stream_header);

  59.     else PRINT_IF_GUID(g, audio_stream);

  60.     else PRINT_IF_GUID(g, audio_conceal_none);

  61.     else PRINT_IF_GUID(g, video_stream);

  62.     else PRINT_IF_GUID(g, video_conceal_none);

  63.     else PRINT_IF_GUID(g, command_stream);

  64.     else PRINT_IF_GUID(g, comment_header);

  65.     else PRINT_IF_GUID(g, codec_comment_header);

  66.     else PRINT_IF_GUID(g, codec_comment1_header);

  67.     else PRINT_IF_GUID(g, data_header);

  68.     else PRINT_IF_GUID(g, index_guid);

  69.     else PRINT_IF_GUID(g, head1_guid);

  70.     else PRINT_IF_GUID(g, head2_guid);

  71.     else PRINT_IF_GUID(g, my_guid);

  72.     else PRINT_IF_GUID(g, ext_stream_header);

  73.     else PRINT_IF_GUID(g, extended_content_header);

  74.     else PRINT_IF_GUID(g, ext_stream_embed_stream_header);

  75.     else PRINT_IF_GUID(g, ext_stream_audio_stream);

  76.     else PRINT_IF_GUID(g, metadata_header);

  77.     else PRINT_IF_GUID(g, stream_bitrate_guid);

  78.     else

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

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

  81.         printf(" 0x%02x,", (*g)[i]);

  82.     printf("}\n");

  83. }

  84. #undef PRINT_IF_GUID

  85. #endif

  86. 

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

  88. {

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

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

  91. }

  92. 

  93. #if 0

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

  95. {

  96.     int len, c;

  97.     char *q;

  98. 

  99.     len = get_le16(pb);

  100.     q = buf;

  101.     while (len > 0) {

  102.         c = get_le16(pb);

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

  104.             *q++ = c;

  105.         len--;

  106.     }

  107.     *q = '\0';

  108. }

  109. #endif

  110. 

  111. #ifdef CONFIG_MMSH_PROTOCOL

  112. static int is_mms(ByteIOContext *pb)

  113. {

  114.     return url_fileno(pb) && url_fileno(pb)->prot &&

  115.          !strcmp(url_fileno(pb)->prot->name, "mmsh");

  116. }

  117. #endif

  118. 

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

  120. {

  121.     char* q = buf;

  122.     len /= 2;

  123.     while (len--) {

  124.         uint8_t tmp;

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

  126.     }

  127.     *q = '\0';

  128. }

  129. 

  130. static int asf_probe(AVProbeData *pd)

  131. {

  132.     /* check file header */

  133.     if (!memcmp(pd->buf, &asf_header, sizeof(GUID)))

  134.         return AVPROBE_SCORE_MAX;

  135.     else

  136.         return 0;

  137. }

  138. 

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

  140.     switch(type){

  141.         case 2: return get_le32(pb);

  142.         case 3: return get_le32(pb);

  143.         case 4: return get_le64(pb);

  144.         case 5: return get_le16(pb);

  145.         default:return INT_MIN;

  146.     }

  147. }

  148. 

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

  150. {

  151.     ASFContext *asf = s->priv_data;

  152.     GUID g;

  153.     ByteIOContext *pb = s->pb;

  154.     AVStream *st;

  155.     ASFStream *asf_st;

  156.     int size, i;

  157.     int64_t gsize;

  158.     AVRational dar[128];

  159.     uint32_t bitrate[128];

  160. 

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

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

  163. 

  164.     get_guid(pb, &g);

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

  166.         goto fail;

  167.     get_le64(pb);

  168.     get_le32(pb);

  169.     get_byte(pb);

  170.     get_byte(pb);

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

  172.     for(;;) {

  173.         get_guid(pb, &g);

  174.         gsize = get_le64(pb);

  175. #ifdef DEBUG

  176.         printf("%08"PRIx64": ", url_ftell(pb) - 24);

  177.         print_guid(&g);

  178.         printf("  size=0x%"PRIx64"\n", gsize);

  179. #endif

  180.         if (!memcmp(&g, &data_header, sizeof(GUID))) {

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

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

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

  184.                 asf->data_object_size = gsize - 24;

  185.             } else {

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

  187.             }

  188.             break;

  189.         }

  190.         if (gsize < 24)

  191.             goto fail;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  207.             int type, type_specific_size, sizeX;

  208.             uint64_t total_size;

  209.             unsigned int tag1;

  210.             int64_t pos1, pos2, start_time;

  211.             int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  212. 

  213.             pos1 = url_ftell(pb);

  214. 

  215.             st = av_new_stream(s, 0);

  216.             if (!st)

  217.                 goto fail;

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

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

  220.             if (!asf_st)

  221.                 goto fail;

  222.             st->priv_data = asf_st;

  223.             start_time = asf->hdr.preroll;

  224. 

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

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

  227.                     (10000000 / 1000) - start_time;

  228.             }

  229.             get_guid(pb, &g);

  230. 

  231.             test_for_ext_stream_audio = 0;

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

  233.                 type = CODEC_TYPE_AUDIO;

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

  235.                 type = CODEC_TYPE_VIDEO;

  236.             } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {

  237.                 type = CODEC_TYPE_UNKNOWN;

  238.             } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {

  239.                 test_for_ext_stream_audio = 1;

  240.                 type = CODEC_TYPE_UNKNOWN;

  241.             } else {

  242.                 goto fail;

  243.             }

  244.             get_guid(pb, &g);

  245.             total_size = get_le64(pb);

  246.             type_specific_size = get_le32(pb);

  247.             get_le32(pb);

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

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

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

  251. 

  252.             get_le32(pb);

  253. 

  254.             if (test_for_ext_stream_audio) {

  255.                 get_guid(pb, &g);

  256.                 if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {

  257.                     type = CODEC_TYPE_AUDIO;

  258.                     is_dvr_ms_audio=1;

  259.                     get_guid(pb, &g);

  260.                     get_le32(pb);

  261.                     get_le32(pb);

  262.                     get_le32(pb);

  263.                     get_guid(pb, &g);

  264.                     get_le32(pb);

  265.                 }

  266.             }

  267. 

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

  269.             if (type == CODEC_TYPE_AUDIO) {

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

  271.                 if (is_dvr_ms_audio) {

  272.                     // codec_id and codec_tag are unreliable in dvr_ms

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

  274.                     st->codec->codec_id = CODEC_ID_NONE;

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

  276.                 }

  277.                 st->need_parsing = AVSTREAM_PARSE_FULL;

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

  279.                 pos2 = url_ftell(pb);

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

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

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

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

  284.                     get_le16(pb); //ds_data_size

  285.                     get_byte(pb); //ds_silence_data

  286.                 }

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

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

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

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

  291.                     if (!asf_st->ds_chunk_size

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

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

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

  295.                 }

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

  297.                 case CODEC_ID_MP3:

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

  299.                     break;

  300.                 case CODEC_ID_PCM_S16LE:

  301.                 case CODEC_ID_PCM_S16BE:

  302.                 case CODEC_ID_PCM_U16LE:

  303.                 case CODEC_ID_PCM_U16BE:

  304.                 case CODEC_ID_PCM_S8:

  305.                 case CODEC_ID_PCM_U8:

  306.                 case CODEC_ID_PCM_ALAW:

  307.                 case CODEC_ID_PCM_MULAW:

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

  309.                     break;

  310.                 default:

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

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

  313.                     break;

  314.                 }

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

  316.                 get_le32(pb);

  317.                 get_le32(pb);

  318.                 get_byte(pb);

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

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

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

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

  323.                 /* not available for asf */

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

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

  326.                 tag1 = get_le32(pb);

  327.                 url_fskip(pb, 20);

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

  329.                 size= sizeX;

  330.                 if (size > 40) {

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

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

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

  334.                 }

  335. 

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

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

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

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

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

  341. #ifdef WORDS_BIGENDIAN

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

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

  344. #else

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

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

  347. #endif

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

  349.         }

  350. 

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

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

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

  354.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  355.             }

  356.             pos2 = url_ftell(pb);

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

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

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

  360. 

  361.             len1 = get_le16(pb);

  362.             len2 = get_le16(pb);

  363.             len3 = get_le16(pb);

  364.             len4 = get_le16(pb);

  365.             len5 = get_le16(pb);

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

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

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

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

  370.             url_fskip(pb, len5);

  371.         } else if (!memcmp(&g, &stream_bitrate_guid, sizeof(GUID))) {

  372.             int stream_count = get_le16(pb);

  373.             int j;

  374. 

  375. //            av_log(NULL, AV_LOG_ERROR, "stream bitrate properties\n");

  376. //            av_log(NULL, AV_LOG_ERROR, "streams %d\n", streams);

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

  378.                 int flags, bitrate, stream_id;

  379. 

  380.                 flags= get_le16(pb);

  381.                 bitrate= get_le32(pb);

  382.                 stream_id= (flags & 0x7f);

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

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

  385.             }

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

  387.                 int desc_count, i;

  388. 

  389.                 desc_count = get_le16(pb);

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

  391.                 {

  392.                         int name_len,value_type,value_len;

  393.                         uint64_t value_num = 0;

  394.                         char name[1024];

  395. 

  396.                         name_len = get_le16(pb);

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

  398.                         value_type = get_le16(pb);

  399.                         value_len = get_le16(pb);

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

  401.                         {

  402.                                 if     (!strcmp(name,"WM/AlbumTitle")) get_str16_nolen(pb, value_len, s->album, sizeof(s->album));

  403.                                 else if(!strcmp(name,"WM/Genre"     )) get_str16_nolen(pb, value_len, s->genre, sizeof(s->genre));

  404.                                 else if(!strcmp(name,"WM/Year"      )) {

  405.                                     char year[8];

  406.                                     get_str16_nolen(pb, value_len, year, sizeof(year));

  407.                                     s->year = atoi(year);

  408.                                 }

  409.                                 else if(!strcmp(name,"WM/Track") && s->track == 0) {

  410.                                     char track[8];

  411.                                     get_str16_nolen(pb, value_len, track, sizeof(track));

  412.                                     s->track = strtol(track, NULL, 10) + 1;

  413.                                 }

  414.                                 else if(!strcmp(name,"WM/TrackNumber")) {

  415.                                     char track[8];

  416.                                     get_str16_nolen(pb, value_len, track, sizeof(track));

  417.                                     s->track = strtol(track, NULL, 10);

  418.                                 }

  419.                                 else url_fskip(pb, value_len);

  420.                         }

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

  422.                         {

  423.                                 value_num= get_value(pb, value_type);

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

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

  426.                         }

  427.                 }

  428.         } else if (!memcmp(&g, &metadata_header, sizeof(GUID))) {

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

  430.             n = get_le16(pb);

  431. 

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

  433.                 char name[1024];

  434. 

  435.                 get_le16(pb); //lang_list_index

  436.                 stream_num= get_le16(pb);

  437.                 name_len=   get_le16(pb);

  438.                 value_type= get_le16(pb);

  439.                 value_len=  get_le32(pb);

  440. 

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

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

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

  444.                 url_fskip(pb, value_len - 2);

  445. 

  446.                 if(stream_num<128){

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

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

  449.                 }

  450.             }

  451.         } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {

  452.             int ext_len, payload_ext_ct, stream_ct;

  453.             uint32_t ext_d, leak_rate, stream_num;

  454.             int64_t pos_ex_st;

  455.             pos_ex_st = url_ftell(pb);

  456. 

  457.             get_le64(pb); // starttime

  458.             get_le64(pb); // endtime

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

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

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

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

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

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

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

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

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

  468.             get_le16(pb); // stream-language-id-index

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

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

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

  472. 

  473.             if (stream_num < 128)

  474.                 bitrate[stream_num] = leak_rate;

  475. 

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

  477.                 get_le16(pb);

  478.                 ext_len = get_le16(pb);

  479.                 url_fseek(pb, ext_len, SEEK_CUR);

  480.             }

  481. 

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

  483.                 get_guid(pb, &g);

  484.                 ext_d=get_le16(pb);

  485.                 ext_len=get_le32(pb);

  486.                 url_fseek(pb, ext_len, SEEK_CUR);

  487.             }

  488. 

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

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

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

  492.             int v1, v2;

  493.             get_guid(pb, &g);

  494.             v1 = get_le32(pb);

  495.             v2 = get_le16(pb);

  496. #if 0

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

  498.             int len, v1, n, num;

  499.             char str[256], *q;

  500.             char tag[16];

  501. 

  502.             get_guid(pb, &g);

  503.             print_guid(&g);

  504. 

  505.             n = get_le32(pb);

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

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

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

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

  510.                 len = get_le16(pb);

  511.                 q = tag;

  512.                 while (len > 0) {

  513.                     v1 = get_byte(pb);

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

  515.                         *q++ = v1;

  516.                     len--;

  517.                 }

  518.                 *q = '\0';

  519.             }

  520. #endif

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

  522.             goto fail;

  523.         } else {

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

  525.         }

  526.     }

  527.     get_guid(pb, &g);

  528.     get_le64(pb);

  529.     get_byte(pb);

  530.     get_byte(pb);

  531.     if (url_feof(pb))

  532.         goto fail;

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

  534.     asf->packet_size_left = 0;

  535. 

  536. 

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

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

  539.         if(stream_num>=0){

  540.             AVCodecContext *codec= s->streams[stream_num]->codec;

  541.             if (!codec->bit_rate)

  542.                 codec->bit_rate = bitrate[i];

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

  544.                 av_reduce(&codec->sample_aspect_ratio.num,

  545.                           &codec->sample_aspect_ratio.den,

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

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

  548.         }

  549.     }

  550. 

  551. #ifdef CONFIG_MMSH_PROTOCOL

  552.     /* Give info about ourselves to the mms protocol */

  553.     if(is_mms(pb))

  554.         ff_mms_set_stream_selection(url_fileno(pb), s);

  555. #endif

  556. 

  557.     return 0;

  558. 

  559.  fail:

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

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

  562.         if (st) {

  563.             av_free(st->priv_data);

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

  565.         }

  566.         av_free(st);

  567.     }

  568.     return -1;

  569. }

  570. 

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

  572.     switch (bits & 3) \

  573.     { \

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

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

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

  577.     default: var = defval; break; \

  578.     }

  579. 

  580. /**

  581.  *

  582.  * @return <0 in case of an error

  583.  */

  584. static int asf_get_packet(AVFormatContext *s)

  585. {

  586.     ASFContext *asf = s->priv_data;

  587.     ByteIOContext *pb = s->pb;

  588.     uint32_t packet_length, padsize;

  589.     int rsize = 8;

  590.     int c, d, e, off;

  591. 

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

  593. 

  594.     c=d=e=-1;

  595.     while(off-- > 0){

  596.         c=d; d=e;

  597.         e= get_byte(pb);

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

  599.             break;

  600.     }

  601. 

  602.     if (c != 0x82) {

  603.         if (!url_feof(pb))

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

  605.     }

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

  607.         if (d || e) {

  608.             if (!url_feof(pb))

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

  610.             return -1;

  611.         }

  612.         c= get_byte(pb);

  613.         d= get_byte(pb);

  614.         rsize+=3;

  615.     }else{

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

  617.     }

  618. 

  619.     asf->packet_flags    = c;

  620.     asf->packet_property = d;

  621. 

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

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

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

  625. 

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

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

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

  629.         return -1;

  630.     }

  631.     if(padsize >= packet_length){

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

  633.         return -1;

  634.     }

  635. 

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

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

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

  639. 

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

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

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

  643.     } else {

  644.         asf->packet_segments = 1;

  645.         asf->packet_segsizetype = 0x80;

  646.     }

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

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

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

  650.     asf->packet_padsize = padsize;

  651. #ifdef DEBUG

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

  653. #endif

  654.     return 0;

  655. }

  656. 

  657. /**

  658.  *

  659.  * @return <0 if error

  660.  */

  661. static int asf_read_frame_header(AVFormatContext *s){

  662.     ASFContext *asf = s->priv_data;

  663.     ByteIOContext *pb = s->pb;

  664.     int rsize = 1;

  665.     int num = get_byte(pb);

  666.     int64_t ts0, ts1;

  667. 

  668.     asf->packet_segments--;

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

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

  671.     // sequence should be ignored!

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

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

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

  675. //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);

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

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

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

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

  680.             return -1;

  681.         }

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

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

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

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

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

  687.             url_fskip(pb, 10);

  688.             ts0= get_le64(pb);

  689.             ts1= get_le64(pb);

  690.             url_fskip(pb, 12);

  691.             get_le32(pb);

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

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

  694.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  695.         }else

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

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

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

  699.         // multipacket - frag_offset is beginning timestamp

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

  701.         asf->packet_frag_offset = 0;

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

  703. 

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

  705.         rsize++;

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

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

  708.         return -1;

  709.     }

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

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

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

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

  714.             return -1;

  715.         }

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

  717.     } else {

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

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

  720.     }

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

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

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

  724.             return -1;

  725.     }

  726.     asf->packet_size_left -= rsize;

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

  728. 

  729.     return 0;

  730. }

  731. 

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

  733. {

  734.     ASFContext *asf = s->priv_data;

  735.     ASFStream *asf_st = 0;

  736.     ByteIOContext *pb = s->pb;

  737.     //static int pc = 0;

  738.     for (;;) {

  739.         if(url_feof(pb))

  740.             return AVERROR(EIO);

  741.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  746.             assert(ret>=0);

  747.             /* fail safe */

  748.             url_fskip(pb, ret);

  749. 

  750.             asf->packet_pos= url_ftell(s->pb);

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

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

  753.                 return AVERROR(EIO); /* Do not exceed the size of the data object */

  754.             ret = asf_get_packet(s);

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

  756.             if (ret < 0)

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

  758.             asf->packet_time_start = 0;

  759.             continue;

  760.         }

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

  762.             if(asf_read_frame_header(s) < 0){

  763.                 asf->packet_segments= 0;

  764.                 continue;

  765.             }

  766.             if (asf->stream_index < 0

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

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

  769.                 ) {

  770.                 asf->packet_time_start = 0;

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

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

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

  774.                 if(asf->stream_index < 0)

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

  776.                 continue;

  777.             }

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

  779.         }

  780.         asf_st = asf->asf_st;

  781. 

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

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

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

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

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

  787.             asf->packet_size_left--;

  788.             asf->packet_multi_size--;

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

  790.             {

  791.                 asf->packet_time_start = 0;

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

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

  794.                 continue;

  795.             }

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

  797.             //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);

  798.         }

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

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

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

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

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

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

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

  806.         }

  807. 

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

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

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

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

  812.                 asf_st->frag_offset = 0;

  813.                 av_free_packet(&asf_st->pkt);

  814.             }

  815.             /* new packet */

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

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

  818.             asf_st->pkt.pts = asf->packet_frag_timestamp;

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

  820.             asf_st->pkt.pos =

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

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

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

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

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

  826.                 asf->packet_key_frame = 1;

  827.             if (asf->packet_key_frame)

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

  829.         }

  830. 

  831.         /* read data */

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

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

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

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

  836.         if (asf->packet_size_left < 0)

  837.             continue;

  838. 

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

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

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

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

  843.             continue;

  844.         }

  845. 

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

  847.                    asf->packet_frag_size);

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

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

  850.                             asf->packet_frag_size);

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

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

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

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

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

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

  857.                 int i;

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

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

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

  861.                     asf_st->frag_offset = 0;

  862.                     av_free_packet(&asf_st->pkt);

  863.                     continue;

  864.                 }

  865.             }

  866. 

  867.             /* return packet */

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

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

  870.                     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);

  871.               }else{

  872.                 /* packet descrambling */

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

  874.                 if (newdata) {

  875.                     int offset = 0;

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

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

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

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

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

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

  882. 

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

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

  885.                         memcpy(newdata + offset,

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

  887.                                asf_st->ds_chunk_size);

  888.                         offset += asf_st->ds_chunk_size;

  889.                     }

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

  891.                     asf_st->pkt.data = newdata;

  892.                 }

  893.               }

  894.             }

  895.             asf_st->frag_offset = 0;

  896.             *pkt= asf_st->pkt;

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

  898.             asf_st->pkt.size = 0;

  899.             asf_st->pkt.data = 0;

  900.             break; // packet completed

  901.         }

  902.     }

  903.     return 0;

  904. }

  905. 

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

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

  908. // leftover information from previous reads

  909. static void asf_reset_header(AVFormatContext *s)

  910. {

  911.     ASFContext *asf = s->priv_data;

  912.     ASFStream *asf_st;

  913.     int i;

  914. 

  915.     asf->packet_nb_frames = 0;

  916.     asf->packet_size_left = 0;

  917.     asf->packet_segments = 0;

  918.     asf->packet_flags = 0;

  919.     asf->packet_property = 0;

  920.     asf->packet_timestamp = 0;

  921.     asf->packet_segsizetype = 0;

  922.     asf->packet_segments = 0;

  923.     asf->packet_seq = 0;

  924.     asf->packet_replic_size = 0;

  925.     asf->packet_key_frame = 0;

  926.     asf->packet_padsize = 0;

  927.     asf->packet_frag_offset = 0;

  928.     asf->packet_frag_size = 0;

  929.     asf->packet_frag_timestamp = 0;

  930.     asf->packet_multi_size = 0;

  931.     asf->packet_obj_size = 0;

  932.     asf->packet_time_delta = 0;

  933.     asf->packet_time_start = 0;

  934. 

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

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

  937.         av_free_packet(&asf_st->pkt);

  938.         asf_st->frag_offset=0;

  939.         asf_st->seq=0;

  940.     }

  941.     asf->asf_st= NULL;

  942. }

  943. 

  944. static int asf_read_close(AVFormatContext *s)

  945. {

  946.     int i;

  947. 

  948.     asf_reset_header(s);

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

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

  951.         av_free(st->priv_data);

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

  953.     }

  954.     return 0;

  955. }

  956. 

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

  958. {

  959.     ASFContext *asf = s->priv_data;

  960.     AVPacket pkt1, *pkt = &pkt1;

  961.     ASFStream *asf_st;

  962.     int64_t pts;

  963.     int64_t pos= *ppos;

  964.     int i;

  965.     int64_t start_pos[s->nb_streams];

  966. 

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

  968.         start_pos[i]= pos;

  969.     }

  970. 

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

  972.     *ppos= pos;

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

  974. 

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

  976.     asf_reset_header(s);

  977.     for(;;){

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

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

  980.             return AV_NOPTS_VALUE;

  981.         }

  982. 

  983.         pts= pkt->pts;

  984. 

  985.         av_free_packet(pkt);

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

  987.             i= pkt->stream_index;

  988. 

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

  990. 

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

  992.             pos= asf_st->packet_pos;

  993. 

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

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

  996. 

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

  998.                break;

  999.         }

  1000.     }

  1001. 

  1002.     *ppos= pos;

  1003. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1004. 

  1005.     return pts;

  1006. }

  1007. 

  1008. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1009. {

  1010.     GUID g;

  1011.     ASFContext *asf = s->priv_data;

  1012.     int64_t gsize, itime;

  1013.     int64_t pos, current_pos, index_pts;

  1014.     int i;

  1015.     int pct,ict;

  1016. 

  1017.     current_pos = url_ftell(s->pb);

  1018. 

  1019.     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);

  1020.     get_guid(s->pb, &g);

  1021.     if (!memcmp(&g, &index_guid, sizeof(GUID))) {

  1022.         gsize = get_le64(s->pb);

  1023.         get_guid(s->pb, &g);

  1024.         itime=get_le64(s->pb);

  1025.         pct=get_le32(s->pb);

  1026.         ict=get_le32(s->pb);

  1027.         av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1028. 

  1029.         for (i=0;i<ict;i++){

  1030.             int pktnum=get_le32(s->pb);

  1031.             int pktct =get_le16(s->pb);

  1032.             av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);

  1033. 

  1034.             pos=s->data_offset + asf->packet_size*(int64_t)pktnum;

  1035.             index_pts=av_rescale(itime, i, 10000);

  1036. 

  1037.             av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);

  1038.         }

  1039.         asf->index_read= 1;

  1040.     }

  1041.     url_fseek(s->pb, current_pos, SEEK_SET);

  1042. }

  1043. 

  1044. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1045. {

  1046.     ASFContext *asf = s->priv_data;

  1047.     AVStream *st = s->streams[stream_index];

  1048.     int64_t pos;

  1049.     int index;

  1050. 

  1051.     if (asf->packet_size <= 0)

  1052.         return -1;

  1053. 

  1054.     /* Try using the protocol's read_seek if available */

  1055.     if(s->pb) {

  1056.         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);

  1057.         if(ret >= 0)

  1058.             asf_reset_header(s);

  1059.         if (ret != AVERROR(ENOSYS))

  1060.             return ret;

  1061.     }

  1062. 

  1063.     if (!asf->index_read)

  1064.         asf_build_simple_index(s, stream_index);

  1065. 

  1066.     if(!(asf->index_read && st->index_entries)){

  1067.         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)

  1068.             return -1;

  1069.     }else{

  1070.         index= av_index_search_timestamp(st, pts, flags);

  1071.         if(index<0)

  1072.             return -1;

  1073. 

  1074.         /* find the position */

  1075.         pos = st->index_entries[index].pos;

  1076.         pts = st->index_entries[index].timestamp;

  1077. 

  1078.     // various attempts to find key frame have failed so far

  1079.     //    asf_reset_header(s);

  1080.     //    url_fseek(s->pb, pos, SEEK_SET);

  1081.     //    key_pos = pos;

  1082.     //     for(i=0;i<16;i++){

  1083.     //         pos = url_ftell(s->pb);

  1084.     //         if (av_read_frame(s, &pkt) < 0){

  1085.     //             av_log(s, AV_LOG_INFO, "seek failed\n");

  1086.     //             return -1;

  1087.     //         }

  1088.     //         asf_st = s->streams[stream_index]->priv_data;

  1089.     //         pos += st->parser->frame_offset;

  1090.     //

  1091.     //         if (pkt.size > b) {

  1092.     //             b = pkt.size;

  1093.     //             key_pos = pos;

  1094.     //         }

  1095.     //

  1096.     //         av_free_packet(&pkt);

  1097.     //     }

  1098. 

  1099.         /* do the seek */

  1100.         av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1101.         url_fseek(s->pb, pos, SEEK_SET);

  1102.     }

  1103.     asf_reset_header(s);

  1104.     return 0;

  1105. }

  1106. 

  1107. AVInputFormat asf_demuxer = {

  1108.     "asf",

  1109.     "asf format",

  1110.     sizeof(ASFContext),

  1111.     asf_probe,

  1112.     asf_read_header,

  1113.     asf_read_packet,

  1114.     asf_read_close,

  1115.     asf_read_seek,

  1116.     asf_read_pts,

  1117. };