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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. 

  22. #include "libavutil/common.h"

  23. #include "libavcodec/mpegaudio.h"

  24. #include "avformat.h"

  25. #include "riff.h"

  26. #include "asf.h"

  27. #include "asfcrypt.h"

  28. 

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

  30. 

  31. #undef NDEBUG

  32. #include <assert.h>

  33. 

  34. #define FRAME_HEADER_SIZE 17

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

  36. 

  37. static const GUID index_guid = {

  38.     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb

  39. };

  40. 

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

  42.     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2

  43. };

  44. /**********************************/

  45. /* decoding */

  46. 

  47. //#define DEBUG

  48. 

  49. #ifdef DEBUG

  50. #define PRINT_IF_GUID(g,cmp) \

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

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

  53. 

  54. static void print_guid(const GUID *g)

  55. {

  56.     int i;

  57.     PRINT_IF_GUID(g, asf_header);

  58.     else PRINT_IF_GUID(g, file_header);

  59.     else PRINT_IF_GUID(g, stream_header);

  60.     else PRINT_IF_GUID(g, audio_stream);

  61.     else PRINT_IF_GUID(g, audio_conceal_none);

  62.     else PRINT_IF_GUID(g, video_stream);

  63.     else PRINT_IF_GUID(g, video_conceal_none);

  64.     else PRINT_IF_GUID(g, command_stream);

  65.     else PRINT_IF_GUID(g, comment_header);

  66.     else PRINT_IF_GUID(g, codec_comment_header);

  67.     else PRINT_IF_GUID(g, codec_comment1_header);

  68.     else PRINT_IF_GUID(g, data_header);

  69.     else PRINT_IF_GUID(g, index_guid);

  70.     else PRINT_IF_GUID(g, head1_guid);

  71.     else PRINT_IF_GUID(g, head2_guid);

  72.     else PRINT_IF_GUID(g, my_guid);

  73.     else PRINT_IF_GUID(g, ext_stream_header);

  74.     else PRINT_IF_GUID(g, extended_content_header);

  75.     else PRINT_IF_GUID(g, ext_stream_embed_stream_header);

  76.     else PRINT_IF_GUID(g, ext_stream_audio_stream);

  77.     else PRINT_IF_GUID(g, metadata_header);

  78.     else PRINT_IF_GUID(g, stream_bitrate_guid);

  79.     else

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

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

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

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

  84. }

  85. #undef PRINT_IF_GUID

  86. #else

  87. #define print_guid(g)

  88. #endif

  89. 

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

  91. {

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

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

  94. }

  95. 

  96. #if 0

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

  98. {

  99.     int len, c;

  100.     char *q;

  101. 

  102.     len = get_le16(pb);

  103.     q = buf;

  104.     while (len > 0) {

  105.         c = get_le16(pb);

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

  107.             *q++ = c;

  108.         len--;

  109.     }

  110.     *q = '\0';

  111. }

  112. #endif

  113. 

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

  115. {

  116.     char* q = buf;

  117.     len /= 2;

  118.     while (len--) {

  119.         uint8_t tmp;

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

  121.     }

  122.     *q = '\0';

  123. }

  124. 

  125. static int asf_probe(AVProbeData *pd)

  126. {

  127.     /* check file header */

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

  129.         return AVPROBE_SCORE_MAX;

  130.     else

  131.         return 0;

  132. }

  133. 

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

  135.     switch(type){

  136.         case 2: return get_le32(pb);

  137.         case 3: return get_le32(pb);

  138.         case 4: return get_le64(pb);

  139.         case 5: return get_le16(pb);

  140.         default:return INT_MIN;

  141.     }

  142. }

  143. 

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

  145. {

  146.     ASFContext *asf = s->priv_data;

  147.     GUID g;

  148.     ByteIOContext *pb = s->pb;

  149.     AVStream *st;

  150.     ASFStream *asf_st;

  151.     int size, i;

  152.     int64_t gsize;

  153.     AVRational dar[128];

  154.     uint32_t bitrate[128];

  155. 

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

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

  158. 

  159.     get_guid(pb, &g);

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

  161.         return -1;

  162.     get_le64(pb);

  163.     get_le32(pb);

  164.     get_byte(pb);

  165.     get_byte(pb);

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

  167.     for(;;) {

  168.         get_guid(pb, &g);

  169.         gsize = get_le64(pb);

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

  171.         print_guid(&g);

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

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

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

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

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

  177.                 asf->data_object_size = gsize - 24;

  178.             } else {

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

  180.             }

  181.             break;

  182.         }

  183.         if (gsize < 24)

  184.             return -1;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  200.             enum CodecType type;

  201.             int type_specific_size, sizeX;

  202.             uint64_t total_size;

  203.             unsigned int tag1;

  204.             int64_t pos1, pos2, start_time;

  205.             int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  206. 

  207.             pos1 = url_ftell(pb);

  208. 

  209.             st = av_new_stream(s, 0);

  210.             if (!st)

  211.                 return AVERROR(ENOMEM);

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

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

  214.             if (!asf_st)

  215.                 return AVERROR(ENOMEM);

  216.             st->priv_data = asf_st;

  217.             start_time = asf->hdr.preroll;

  218. 

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

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

  221.                     (10000000 / 1000) - start_time;

  222.             }

  223.             get_guid(pb, &g);

  224. 

  225.             test_for_ext_stream_audio = 0;

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

  227.                 type = CODEC_TYPE_AUDIO;

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

  229.                 type = CODEC_TYPE_VIDEO;

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

  231.                 type = CODEC_TYPE_DATA;

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

  233.                 test_for_ext_stream_audio = 1;

  234.                 type = CODEC_TYPE_UNKNOWN;

  235.             } else {

  236.                 return -1;

  237.             }

  238.             get_guid(pb, &g);

  239.             total_size = get_le64(pb);

  240.             type_specific_size = get_le32(pb);

  241.             get_le32(pb);

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

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

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

  245. 

  246.             get_le32(pb);

  247. 

  248.             if (test_for_ext_stream_audio) {

  249.                 get_guid(pb, &g);

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

  251.                     type = CODEC_TYPE_AUDIO;

  252.                     is_dvr_ms_audio=1;

  253.                     get_guid(pb, &g);

  254.                     get_le32(pb);

  255.                     get_le32(pb);

  256.                     get_le32(pb);

  257.                     get_guid(pb, &g);

  258.                     get_le32(pb);

  259.                 }

  260.             }

  261. 

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

  263.             if (type == CODEC_TYPE_AUDIO) {

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

  265.                 if (is_dvr_ms_audio) {

  266.                     // codec_id and codec_tag are unreliable in dvr_ms

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

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

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

  270.                 }

  271.                 st->need_parsing = AVSTREAM_PARSE_FULL;

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

  273.                 pos2 = url_ftell(pb);

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

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

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

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

  278.                     get_le16(pb); //ds_data_size

  279.                     get_byte(pb); //ds_silence_data

  280.                 }

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

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

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

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

  285.                     if (!asf_st->ds_chunk_size

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

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

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

  289.                 }

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

  291.                 case CODEC_ID_MP3:

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

  293.                     break;

  294.                 case CODEC_ID_PCM_S16LE:

  295.                 case CODEC_ID_PCM_S16BE:

  296.                 case CODEC_ID_PCM_U16LE:

  297.                 case CODEC_ID_PCM_U16BE:

  298.                 case CODEC_ID_PCM_S8:

  299.                 case CODEC_ID_PCM_U8:

  300.                 case CODEC_ID_PCM_ALAW:

  301.                 case CODEC_ID_PCM_MULAW:

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

  303.                     break;

  304.                 default:

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

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

  307.                     break;

  308.                 }

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

  310.                 get_le32(pb);

  311.                 get_le32(pb);

  312.                 get_byte(pb);

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

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

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

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

  317.                 /* not available for asf */

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

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

  320.                 tag1 = get_le32(pb);

  321.                 url_fskip(pb, 20);

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

  323.                 size= sizeX;

  324.                 if (size > 40) {

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

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

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

  328.                 }

  329. 

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

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

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

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

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

  335. #ifdef WORDS_BIGENDIAN

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

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

  338. #else

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

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

  341. #endif

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

  343.         }

  344. 

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

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

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

  348.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  349.             }

  350.             pos2 = url_ftell(pb);

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

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

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

  354. 

  355.             len1 = get_le16(pb);

  356.             len2 = get_le16(pb);

  357.             len3 = get_le16(pb);

  358.             len4 = get_le16(pb);

  359.             len5 = get_le16(pb);

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

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

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

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

  364.             url_fskip(pb, len5);

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

  366.             int stream_count = get_le16(pb);

  367.             int j;

  368. 

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

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

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

  372.                 int flags, bitrate, stream_id;

  373. 

  374.                 flags= get_le16(pb);

  375.                 bitrate= get_le32(pb);

  376.                 stream_id= (flags & 0x7f);

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

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

  379.             }

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

  381.                 int desc_count, i;

  382. 

  383.                 desc_count = get_le16(pb);

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

  385.                 {

  386.                         int name_len,value_type,value_len;

  387.                         uint64_t value_num = 0;

  388.                         char name[1024];

  389. 

  390.                         name_len = get_le16(pb);

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

  392.                         value_type = get_le16(pb);

  393.                         value_len = get_le16(pb);

  394.                         if (value_type <= 1) // unicode or byte

  395.                         {

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

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

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

  399.                                     char year[8];

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

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

  402.                                 }

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

  404.                                     char track[8];

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

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

  407.                                 }

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

  409.                                     char track[8];

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

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

  412.                                 }

  413.                                 else url_fskip(pb, value_len);

  414.                         }

  415.                         else if (value_type <= 5) // boolean or DWORD or QWORD or WORD

  416.                         {

  417.                                 value_num= get_value(pb, value_type);

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

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

  420.                         }else

  421.                             url_fskip(pb, value_len);

  422.                 }

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

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

  425.             n = get_le16(pb);

  426. 

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

  428.                 char name[1024];

  429. 

  430.                 get_le16(pb); //lang_list_index

  431.                 stream_num= get_le16(pb);

  432.                 name_len=   get_le16(pb);

  433.                 value_type= get_le16(pb);

  434.                 value_len=  get_le32(pb);

  435. 

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

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

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

  439.                 url_fskip(pb, value_len - 2);

  440. 

  441.                 if(stream_num<128){

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

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

  444.                 }

  445.             }

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

  447.             int ext_len, payload_ext_ct, stream_ct;

  448.             uint32_t ext_d, leak_rate, stream_num;

  449.             int64_t pos_ex_st;

  450.             pos_ex_st = url_ftell(pb);

  451. 

  452.             get_le64(pb); // starttime

  453.             get_le64(pb); // endtime

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

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

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

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

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

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

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

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

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

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

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

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

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

  467. 

  468.             if (stream_num < 128)

  469.                 bitrate[stream_num] = leak_rate;

  470. 

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

  472.                 get_le16(pb);

  473.                 ext_len = get_le16(pb);

  474.                 url_fseek(pb, ext_len, SEEK_CUR);

  475.             }

  476. 

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

  478.                 get_guid(pb, &g);

  479.                 ext_d=get_le16(pb);

  480.                 ext_len=get_le32(pb);

  481.                 url_fseek(pb, ext_len, SEEK_CUR);

  482.             }

  483. 

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

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

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

  487.             int v1, v2;

  488.             get_guid(pb, &g);

  489.             v1 = get_le32(pb);

  490.             v2 = get_le16(pb);

  491. #if 0

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

  493.             int len, v1, n, num;

  494.             char str[256], *q;

  495.             char tag[16];

  496. 

  497.             get_guid(pb, &g);

  498.             print_guid(&g);

  499. 

  500.             n = get_le32(pb);

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

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

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

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

  505.                 len = get_le16(pb);

  506.                 q = tag;

  507.                 while (len > 0) {

  508.                     v1 = get_byte(pb);

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

  510.                         *q++ = v1;

  511.                     len--;

  512.                 }

  513.                 *q = '\0';

  514.             }

  515. #endif

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

  517.             return -1;

  518.         } else {

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

  520.         }

  521.     }

  522.     get_guid(pb, &g);

  523.     get_le64(pb);

  524.     get_byte(pb);

  525.     get_byte(pb);

  526.     if (url_feof(pb))

  527.         return -1;

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

  529.     asf->packet_size_left = 0;

  530. 

  531. 

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

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

  534.         if(stream_num>=0){

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

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

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

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

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

  540.                           &st->sample_aspect_ratio.den,

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

  542. //av_log(NULL, 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);

  543.         }

  544.     }

  545. 

  546.     return 0;

  547. }

  548. 

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

  550.     switch (bits & 3) \

  551.     { \

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

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

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

  555.     default: var = defval; break; \

  556.     }

  557. 

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

  559. {

  560.     ASFContext *asf = s->priv_data;

  561.     uint32_t packet_length, padsize;

  562.     int rsize = 8;

  563.     int c, d, e, off;

  564. 

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

  566. 

  567.     c=d=e=-1;

  568.     while(off-- > 0){

  569.         c=d; d=e;

  570.         e= get_byte(pb);

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

  572.             break;

  573.     }

  574. 

  575.     if (c != 0x82) {

  576.         if (!url_feof(pb))

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

  578.     }

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

  580.         if (d || e) {

  581.             if (!url_feof(pb))

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

  583.             return -1;

  584.         }

  585.         c= get_byte(pb);

  586.         d= get_byte(pb);

  587.         rsize+=3;

  588.     }else{

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

  590.     }

  591. 

  592.     asf->packet_flags    = c;

  593.     asf->packet_property = d;

  594. 

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

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

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

  598. 

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

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

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

  602.         return -1;

  603.     }

  604.     if(padsize >= packet_length){

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

  606.         return -1;

  607.     }

  608. 

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

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

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

  612. 

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

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

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

  616.     } else {

  617.         asf->packet_segments = 1;

  618.         asf->packet_segsizetype = 0x80;

  619.     }

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

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

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

  623.     asf->packet_padsize = padsize;

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

  625.     return 0;

  626. }

  627. 

  628. /**

  629.  *

  630.  * @return <0 if error

  631.  */

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

  633.     ASFContext *asf = s->priv_data;

  634.     int rsize = 1;

  635.     int num = get_byte(pb);

  636.     int64_t ts0, ts1;

  637. 

  638.     asf->packet_segments--;

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

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

  641.     // sequence should be ignored!

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

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

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

  645. //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);

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

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

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

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

  650.             return -1;

  651.         }

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

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

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

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

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

  657.             url_fskip(pb, 10);

  658.             ts0= get_le64(pb);

  659.             ts1= get_le64(pb);

  660.             url_fskip(pb, 12);

  661.             get_le32(pb);

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

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

  664.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  665.         }else

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

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

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

  669.         // multipacket - frag_offset is beginning timestamp

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

  671.         asf->packet_frag_offset = 0;

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

  673. 

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

  675.         rsize++;

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

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

  678.         return -1;

  679.     }

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

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

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

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

  684.             return -1;

  685.         }

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

  687.     } else {

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

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

  690.     }

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

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

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

  694.             return -1;

  695.     }

  696.     asf->packet_size_left -= rsize;

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

  698. 

  699.     return 0;

  700. }

  701. 

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

  703. {

  704.     ASFContext *asf = s->priv_data;

  705.     ASFStream *asf_st = 0;

  706.     for (;;) {

  707.         if(url_feof(pb))

  708.             return AVERROR(EIO);

  709.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  714.             assert(ret>=0);

  715.             /* fail safe */

  716.             url_fskip(pb, ret);

  717. 

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

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

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

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

  722.             return 1;

  723.         }

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

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

  726.                 asf->packet_segments= 0;

  727.                 continue;

  728.             }

  729.             if (asf->stream_index < 0

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

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

  732.                 ) {

  733.                 asf->packet_time_start = 0;

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

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

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

  737.                 if(asf->stream_index < 0)

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

  739.                 continue;

  740.             }

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

  742.         }

  743.         asf_st = asf->asf_st;

  744. 

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

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

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

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

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

  750.             asf->packet_size_left--;

  751.             asf->packet_multi_size--;

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

  753.             {

  754.                 asf->packet_time_start = 0;

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

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

  757.                 continue;

  758.             }

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

  760.             //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);

  761.         }

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

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

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

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

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

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

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

  769.         }

  770. 

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

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

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

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

  775.                 asf_st->frag_offset = 0;

  776.                 av_free_packet(&asf_st->pkt);

  777.             }

  778.             /* new packet */

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

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

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

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

  783.             asf_st->pkt.pos =

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

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

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

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

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

  789.                 asf->packet_key_frame = 1;

  790.             if (asf->packet_key_frame)

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

  792.         }

  793. 

  794.         /* read data */

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

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

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

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

  799.         if (asf->packet_size_left < 0)

  800.             continue;

  801. 

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

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

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

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

  806.             continue;

  807.         }

  808. 

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

  810.                    asf->packet_frag_size);

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

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

  813.                             asf->packet_frag_size);

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

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

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

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

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

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

  820.                 int i;

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

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

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

  824.                     asf_st->frag_offset = 0;

  825.                     av_free_packet(&asf_st->pkt);

  826.                     continue;

  827.                 }

  828.             }

  829. 

  830.             /* return packet */

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

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

  833.                     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);

  834.               }else{

  835.                 /* packet descrambling */

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

  837.                 if (newdata) {

  838.                     int offset = 0;

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

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

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

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

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

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

  845. 

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

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

  848.                         memcpy(newdata + offset,

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

  850.                                asf_st->ds_chunk_size);

  851.                         offset += asf_st->ds_chunk_size;

  852.                     }

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

  854.                     asf_st->pkt.data = newdata;

  855.                 }

  856.               }

  857.             }

  858.             asf_st->frag_offset = 0;

  859.             *pkt= asf_st->pkt;

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

  861.             asf_st->pkt.size = 0;

  862.             asf_st->pkt.data = 0;

  863.             break; // packet completed

  864.         }

  865.     }

  866.     return 0;

  867. }

  868. 

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

  870. {

  871.     ASFContext *asf = s->priv_data;

  872. 

  873.     for (;;) {

  874.         int ret;

  875. 

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

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

  878.             return ret;

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

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

  881.         asf->packet_time_start = 0;

  882.     }

  883. 

  884.     return 0;

  885. }

  886. 

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

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

  889. // leftover information from previous reads

  890. static void asf_reset_header(AVFormatContext *s)

  891. {

  892.     ASFContext *asf = s->priv_data;

  893.     ASFStream *asf_st;

  894.     int i;

  895. 

  896.     asf->packet_nb_frames = 0;

  897.     asf->packet_size_left = 0;

  898.     asf->packet_segments = 0;

  899.     asf->packet_flags = 0;

  900.     asf->packet_property = 0;

  901.     asf->packet_timestamp = 0;

  902.     asf->packet_segsizetype = 0;

  903.     asf->packet_segments = 0;

  904.     asf->packet_seq = 0;

  905.     asf->packet_replic_size = 0;

  906.     asf->packet_key_frame = 0;

  907.     asf->packet_padsize = 0;

  908.     asf->packet_frag_offset = 0;

  909.     asf->packet_frag_size = 0;

  910.     asf->packet_frag_timestamp = 0;

  911.     asf->packet_multi_size = 0;

  912.     asf->packet_obj_size = 0;

  913.     asf->packet_time_delta = 0;

  914.     asf->packet_time_start = 0;

  915. 

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

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

  918.         av_free_packet(&asf_st->pkt);

  919.         asf_st->frag_offset=0;

  920.         asf_st->seq=0;

  921.     }

  922.     asf->asf_st= NULL;

  923. }

  924. 

  925. static int asf_read_close(AVFormatContext *s)

  926. {

  927.     int i;

  928. 

  929.     asf_reset_header(s);

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

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

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

  933.     }

  934.     return 0;

  935. }

  936. 

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

  938. {

  939.     ASFContext *asf = s->priv_data;

  940.     AVPacket pkt1, *pkt = &pkt1;

  941.     ASFStream *asf_st;

  942.     int64_t pts;

  943.     int64_t pos= *ppos;

  944.     int i;

  945.     int64_t start_pos[s->nb_streams];

  946. 

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

  948.         start_pos[i]= pos;

  949.     }

  950. 

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

  952.     *ppos= pos;

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

  954. 

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

  956.     asf_reset_header(s);

  957.     for(;;){

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

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

  960.             return AV_NOPTS_VALUE;

  961.         }

  962. 

  963.         pts= pkt->pts;

  964. 

  965.         av_free_packet(pkt);

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

  967.             i= pkt->stream_index;

  968. 

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

  970. 

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

  972.             pos= asf_st->packet_pos;

  973. 

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

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

  976. 

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

  978.                break;

  979.         }

  980.     }

  981. 

  982.     *ppos= pos;

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

  984. 

  985.     return pts;

  986. }

  987. 

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

  989. {

  990.     GUID g;

  991.     ASFContext *asf = s->priv_data;

  992.     int64_t gsize, itime;

  993.     int64_t pos, current_pos, index_pts;

  994.     int i;

  995.     int pct,ict;

  996. 

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

  998. 

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

  1000.     get_guid(s->pb, &g);

  1001.     if (!memcmp(&g, &index_guid, sizeof(GUID))) {

  1002.         gsize = get_le64(s->pb);

  1003.         get_guid(s->pb, &g);

  1004.         itime=get_le64(s->pb);

  1005.         pct=get_le32(s->pb);

  1006.         ict=get_le32(s->pb);

  1007.         av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1008. 

  1009.         for (i=0;i<ict;i++){

  1010.             int pktnum=get_le32(s->pb);

  1011.             int pktct =get_le16(s->pb);

  1012.             av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);

  1013. 

  1014.             pos=s->data_offset + asf->packet_size*(int64_t)pktnum;

  1015.             index_pts=av_rescale(itime, i, 10000);

  1016. 

  1017.             av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);

  1018.         }

  1019.         asf->index_read= 1;

  1020.     }

  1021.     url_fseek(s->pb, current_pos, SEEK_SET);

  1022. }

  1023. 

  1024. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1025. {

  1026.     ASFContext *asf = s->priv_data;

  1027.     AVStream *st = s->streams[stream_index];

  1028.     int64_t pos;

  1029.     int index;

  1030. 

  1031.     if (asf->packet_size <= 0)

  1032.         return -1;

  1033. 

  1034.     /* Try using the protocol's read_seek if available */

  1035.     if(s->pb) {

  1036.         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);

  1037.         if(ret >= 0)

  1038.             asf_reset_header(s);

  1039.         if (ret != AVERROR(ENOSYS))

  1040.             return ret;

  1041.     }

  1042. 

  1043.     if (!asf->index_read)

  1044.         asf_build_simple_index(s, stream_index);

  1045. 

  1046.     if(!(asf->index_read && st->index_entries)){

  1047.         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)

  1048.             return -1;

  1049.     }else{

  1050.         index= av_index_search_timestamp(st, pts, flags);

  1051.         if(index<0)

  1052.             return -1;

  1053. 

  1054.         /* find the position */

  1055.         pos = st->index_entries[index].pos;

  1056.         pts = st->index_entries[index].timestamp;

  1057. 

  1058.     // various attempts to find key frame have failed so far

  1059.     //    asf_reset_header(s);

  1060.     //    url_fseek(s->pb, pos, SEEK_SET);

  1061.     //    key_pos = pos;

  1062.     //     for(i=0;i<16;i++){

  1063.     //         pos = url_ftell(s->pb);

  1064.     //         if (av_read_frame(s, &pkt) < 0){

  1065.     //             av_log(s, AV_LOG_INFO, "seek failed\n");

  1066.     //             return -1;

  1067.     //         }

  1068.     //         asf_st = s->streams[stream_index]->priv_data;

  1069.     //         pos += st->parser->frame_offset;

  1070.     //

  1071.     //         if (pkt.size > b) {

  1072.     //             b = pkt.size;

  1073.     //             key_pos = pos;

  1074.     //         }

  1075.     //

  1076.     //         av_free_packet(&pkt);

  1077.     //     }

  1078. 

  1079.         /* do the seek */

  1080.         av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1081.         url_fseek(s->pb, pos, SEEK_SET);

  1082.     }

  1083.     asf_reset_header(s);

  1084.     return 0;

  1085. }

  1086. 

  1087. AVInputFormat asf_demuxer = {

  1088.     "asf",

  1089.     NULL_IF_CONFIG_SMALL("ASF format"),

  1090.     sizeof(ASFContext),

  1091.     asf_probe,

  1092.     asf_read_header,

  1093.     asf_read_packet,

  1094.     asf_read_close,

  1095.     asf_read_seek,

  1096.     asf_read_pts,

  1097. };