falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
18758 Commits
32 Branches
380MB
Tree: d4da3e4790
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from 'd4da3e4790'
${ noResults }
FFmpeg/libavformat/asfdec.c

1091 lines
39KB
Raw Blame History 

  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, ff_asf_header);

  58.     else PRINT_IF_GUID(g, ff_asf_file_header);

  59.     else PRINT_IF_GUID(g, ff_asf_stream_header);

  60.     else PRINT_IF_GUID(g, ff_asf_audio_stream);

  61.     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);

  62.     else PRINT_IF_GUID(g, ff_asf_video_stream);

  63.     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);

  64.     else PRINT_IF_GUID(g, ff_asf_command_stream);

  65.     else PRINT_IF_GUID(g, ff_asf_comment_header);

  66.     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);

  67.     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);

  68.     else PRINT_IF_GUID(g, ff_asf_data_header);

  69.     else PRINT_IF_GUID(g, index_guid);

  70.     else PRINT_IF_GUID(g, ff_asf_head1_guid);

  71.     else PRINT_IF_GUID(g, ff_asf_head2_guid);

  72.     else PRINT_IF_GUID(g, ff_asf_my_guid);

  73.     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);

  74.     else PRINT_IF_GUID(g, ff_asf_extended_content_header);

  75.     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);

  76.     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);

  77.     else PRINT_IF_GUID(g, ff_asf_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, &ff_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 void get_tag(AVFormatContext *s, const char *key, int type, int len)

  145. {

  146.     char value[1024];

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

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

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

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

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

  152.     } else {

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

  154.         return;

  155.     }

  156.     if (strncmp(key, "WM/", 3))

  157.         key += 3;

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

  159. }

  160. 

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

  162. {

  163.     ASFContext *asf = s->priv_data;

  164.     GUID g;

  165.     ByteIOContext *pb = s->pb;

  166.     AVStream *st;

  167.     ASFStream *asf_st;

  168.     int size, i;

  169.     int64_t gsize;

  170.     AVRational dar[128];

  171.     uint32_t bitrate[128];

  172. 

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

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

  175. 

  176.     get_guid(pb, &g);

  177.     if (memcmp(&g, &ff_asf_header, sizeof(GUID)))

  178.         return -1;

  179.     get_le64(pb);

  180.     get_le32(pb);

  181.     get_byte(pb);

  182.     get_byte(pb);

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

  184.     for(;;) {

  185.         get_guid(pb, &g);

  186.         gsize = get_le64(pb);

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

  188.         print_guid(&g);

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

  190.         if (!memcmp(&g, &ff_asf_data_header, sizeof(GUID))) {

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

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

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

  194.                 asf->data_object_size = gsize - 24;

  195.             } else {

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

  197.             }

  198.             break;

  199.         }

  200.         if (gsize < 24)

  201.             return -1;

  202.         if (!memcmp(&g, &ff_asf_file_header, sizeof(GUID))) {

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

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

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

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

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

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

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

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

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

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

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

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

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

  216.         } else if (!memcmp(&g, &ff_asf_stream_header, sizeof(GUID))) {

  217.             enum CodecType type;

  218.             int type_specific_size, sizeX;

  219.             uint64_t total_size;

  220.             unsigned int tag1;

  221.             int64_t pos1, pos2, start_time;

  222.             int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  223. 

  224.             pos1 = url_ftell(pb);

  225. 

  226.             st = av_new_stream(s, 0);

  227.             if (!st)

  228.                 return AVERROR(ENOMEM);

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

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

  231.             if (!asf_st)

  232.                 return AVERROR(ENOMEM);

  233.             st->priv_data = asf_st;

  234.             start_time = asf->hdr.preroll;

  235. 

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

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

  238.                     (10000000 / 1000) - start_time;

  239.             }

  240.             get_guid(pb, &g);

  241. 

  242.             test_for_ext_stream_audio = 0;

  243.             if (!memcmp(&g, &ff_asf_audio_stream, sizeof(GUID))) {

  244.                 type = CODEC_TYPE_AUDIO;

  245.             } else if (!memcmp(&g, &ff_asf_video_stream, sizeof(GUID))) {

  246.                 type = CODEC_TYPE_VIDEO;

  247.             } else if (!memcmp(&g, &ff_asf_command_stream, sizeof(GUID))) {

  248.                 type = CODEC_TYPE_DATA;

  249.             } else if (!memcmp(&g, &ff_asf_ext_stream_embed_stream_header, sizeof(GUID))) {

  250.                 test_for_ext_stream_audio = 1;

  251.                 type = CODEC_TYPE_UNKNOWN;

  252.             } else {

  253.                 return -1;

  254.             }

  255.             get_guid(pb, &g);

  256.             total_size = get_le64(pb);

  257.             type_specific_size = get_le32(pb);

  258.             get_le32(pb);

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

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

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

  262. 

  263.             get_le32(pb);

  264. 

  265.             if (test_for_ext_stream_audio) {

  266.                 get_guid(pb, &g);

  267.                 if (!memcmp(&g, &ff_asf_ext_stream_audio_stream, sizeof(GUID))) {

  268.                     type = CODEC_TYPE_AUDIO;

  269.                     is_dvr_ms_audio=1;

  270.                     get_guid(pb, &g);

  271.                     get_le32(pb);

  272.                     get_le32(pb);

  273.                     get_le32(pb);

  274.                     get_guid(pb, &g);

  275.                     get_le32(pb);

  276.                 }

  277.             }

  278. 

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

  280.             if (type == CODEC_TYPE_AUDIO) {

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

  282.                 if (is_dvr_ms_audio) {

  283.                     // codec_id and codec_tag are unreliable in dvr_ms

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

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

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

  287.                 }

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

  289.                     st->need_parsing = AVSTREAM_PARSE_NONE;

  290.                 } else {

  291.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  292.                 }

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

  294.                 pos2 = url_ftell(pb);

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

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

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

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

  299.                     get_le16(pb); //ds_data_size

  300.                     get_byte(pb); //ds_silence_data

  301.                 }

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

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

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

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

  306.                     if (!asf_st->ds_chunk_size

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

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

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

  310.                 }

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

  312.                 case CODEC_ID_MP3:

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

  314.                     break;

  315.                 case CODEC_ID_PCM_S16LE:

  316.                 case CODEC_ID_PCM_S16BE:

  317.                 case CODEC_ID_PCM_U16LE:

  318.                 case CODEC_ID_PCM_U16BE:

  319.                 case CODEC_ID_PCM_S8:

  320.                 case CODEC_ID_PCM_U8:

  321.                 case CODEC_ID_PCM_ALAW:

  322.                 case CODEC_ID_PCM_MULAW:

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

  324.                     break;

  325.                 default:

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

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

  328.                     break;

  329.                 }

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

  331.                 get_le32(pb);

  332.                 get_le32(pb);

  333.                 get_byte(pb);

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

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

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

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

  338.                 /* not available for asf */

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

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

  341.                 tag1 = get_le32(pb);

  342.                 url_fskip(pb, 20);

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

  344.                 size= sizeX;

  345.                 if (size > 40) {

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

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

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

  349.                 }

  350. 

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

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

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

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

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

  356. #ifdef WORDS_BIGENDIAN

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

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

  359. #else

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

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

  362. #endif

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

  364.                 }

  365. 

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

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

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

  369.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  370.             }

  371.             pos2 = url_ftell(pb);

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

  373.         } else if (!memcmp(&g, &ff_asf_comment_header, sizeof(GUID))) {

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

  375. 

  376.             len1 = get_le16(pb);

  377.             len2 = get_le16(pb);

  378.             len3 = get_le16(pb);

  379.             len4 = get_le16(pb);

  380.             len5 = get_le16(pb);

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

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

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

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

  385.             url_fskip(pb, len5);

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

  387.             int stream_count = get_le16(pb);

  388.             int j;

  389. 

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

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

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

  393.                 int flags, bitrate, stream_id;

  394. 

  395.                 flags= get_le16(pb);

  396.                 bitrate= get_le32(pb);

  397.                 stream_id= (flags & 0x7f);

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

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

  400.             }

  401.         } else if (!memcmp(&g, &ff_asf_extended_content_header, sizeof(GUID))) {

  402.             int desc_count, i;

  403. 

  404.             desc_count = get_le16(pb);

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

  406.                     int name_len,value_type,value_len;

  407.                     char name[1024];

  408. 

  409.                     name_len = get_le16(pb);

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

  411.                     value_type = get_le16(pb);

  412.                     value_len  = get_le16(pb);

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

  414.             }

  415.         } else if (!memcmp(&g, &ff_asf_metadata_header, sizeof(GUID))) {

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

  417.             n = get_le16(pb);

  418. 

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

  420.                 char name[1024];

  421. 

  422.                 get_le16(pb); //lang_list_index

  423.                 stream_num= get_le16(pb);

  424.                 name_len=   get_le16(pb);

  425.                 value_type= get_le16(pb);

  426.                 value_len=  get_le32(pb);

  427. 

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

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

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

  431.                 url_fskip(pb, value_len - 2);

  432. 

  433.                 if(stream_num<128){

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

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

  436.                 }

  437.             }

  438.         } else if (!memcmp(&g, &ff_asf_ext_stream_header, sizeof(GUID))) {

  439.             int ext_len, payload_ext_ct, stream_ct;

  440.             uint32_t ext_d, leak_rate, stream_num;

  441.             int64_t pos_ex_st;

  442.             pos_ex_st = url_ftell(pb);

  443. 

  444.             get_le64(pb); // starttime

  445.             get_le64(pb); // endtime

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

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

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

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

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

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

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

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

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

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

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

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

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

  459. 

  460.             if (stream_num < 128)

  461.                 bitrate[stream_num] = leak_rate;

  462. 

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

  464.                 get_le16(pb);

  465.                 ext_len = get_le16(pb);

  466.                 url_fseek(pb, ext_len, SEEK_CUR);

  467.             }

  468. 

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

  470.                 get_guid(pb, &g);

  471.                 ext_d=get_le16(pb);

  472.                 ext_len=get_le32(pb);

  473.                 url_fseek(pb, ext_len, SEEK_CUR);

  474.             }

  475. 

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

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

  478.         } else if (!memcmp(&g, &ff_asf_head1_guid, sizeof(GUID))) {

  479.             int v1, v2;

  480.             get_guid(pb, &g);

  481.             v1 = get_le32(pb);

  482.             v2 = get_le16(pb);

  483. #if 0

  484.         } else if (!memcmp(&g, &ff_asf_codec_comment_header, sizeof(GUID))) {

  485.             int len, v1, n, num;

  486.             char str[256], *q;

  487.             char tag[16];

  488. 

  489.             get_guid(pb, &g);

  490.             print_guid(&g);

  491. 

  492.             n = get_le32(pb);

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

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

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

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

  497.                 len = get_le16(pb);

  498.                 q = tag;

  499.                 while (len > 0) {

  500.                     v1 = get_byte(pb);

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

  502.                         *q++ = v1;

  503.                     len--;

  504.                 }

  505.                 *q = '\0';

  506.             }

  507. #endif

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

  509.             return -1;

  510.         } else {

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

  512.         }

  513.     }

  514.     get_guid(pb, &g);

  515.     get_le64(pb);

  516.     get_byte(pb);

  517.     get_byte(pb);

  518.     if (url_feof(pb))

  519.         return -1;

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

  521.     asf->packet_size_left = 0;

  522. 

  523. 

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

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

  526.         if(stream_num>=0){

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

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

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

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

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

  532.                           &st->sample_aspect_ratio.den,

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

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

  535.         }

  536.     }

  537. 

  538.     return 0;

  539. }

  540. 

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

  542.     switch (bits & 3) \

  543.     { \

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

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

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

  547.     default: var = defval; break; \

  548.     }

  549. 

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

  551. {

  552.     ASFContext *asf = s->priv_data;

  553.     uint32_t packet_length, padsize;

  554.     int rsize = 8;

  555.     int c, d, e, off;

  556. 

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

  558. 

  559.     c=d=e=-1;

  560.     while(off-- > 0){

  561.         c=d; d=e;

  562.         e= get_byte(pb);

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

  564.             break;

  565.     }

  566. 

  567.     if (c != 0x82) {

  568.         if (!url_feof(pb))

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

  570.     }

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

  572.         if (d || e) {

  573.             if (!url_feof(pb))

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

  575.             return -1;

  576.         }

  577.         c= get_byte(pb);

  578.         d= get_byte(pb);

  579.         rsize+=3;

  580.     }else{

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

  582.     }

  583. 

  584.     asf->packet_flags    = c;

  585.     asf->packet_property = d;

  586. 

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

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

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

  590. 

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

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

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

  594.         return -1;

  595.     }

  596.     if(padsize >= packet_length){

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

  598.         return -1;

  599.     }

  600. 

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

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

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

  604. 

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

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

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

  608.     } else {

  609.         asf->packet_segments = 1;

  610.         asf->packet_segsizetype = 0x80;

  611.     }

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

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

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

  615.     asf->packet_padsize = padsize;

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

  617.     return 0;

  618. }

  619. 

  620. /**

  621.  *

  622.  * @return <0 if error

  623.  */

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

  625.     ASFContext *asf = s->priv_data;

  626.     int rsize = 1;

  627.     int num = get_byte(pb);

  628.     int64_t ts0, ts1;

  629. 

  630.     asf->packet_segments--;

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

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

  633.     // sequence should be ignored!

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

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

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

  637. //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);

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

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

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

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

  642.             return -1;

  643.         }

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

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

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

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

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

  649.             url_fskip(pb, 10);

  650.             ts0= get_le64(pb);

  651.             ts1= get_le64(pb);

  652.             url_fskip(pb, 12);

  653.             get_le32(pb);

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

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

  656.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  657.         }else

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

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

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

  661.         // multipacket - frag_offset is beginning timestamp

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

  663.         asf->packet_frag_offset = 0;

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

  665. 

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

  667.         rsize++;

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

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

  670.         return -1;

  671.     }

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

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

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

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

  676.             return -1;

  677.         }

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

  679.     } else {

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

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

  682.     }

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

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

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

  686.             return -1;

  687.     }

  688.     asf->packet_size_left -= rsize;

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

  690. 

  691.     return 0;

  692. }

  693. 

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

  695. {

  696.     ASFContext *asf = s->priv_data;

  697.     ASFStream *asf_st = 0;

  698.     for (;;) {

  699.         if(url_feof(pb))

  700.             return AVERROR(EIO);

  701.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  706.             assert(ret>=0);

  707.             /* fail safe */

  708.             url_fskip(pb, ret);

  709. 

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

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

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

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

  714.             return 1;

  715.         }

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

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

  718.                 asf->packet_segments= 0;

  719.                 continue;

  720.             }

  721.             if (asf->stream_index < 0

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

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

  724.                 ) {

  725.                 asf->packet_time_start = 0;

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

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

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

  729.                 if(asf->stream_index < 0)

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

  731.                 continue;

  732.             }

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

  734.         }

  735.         asf_st = asf->asf_st;

  736. 

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

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

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

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

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

  742.             asf->packet_size_left--;

  743.             asf->packet_multi_size--;

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

  745.             {

  746.                 asf->packet_time_start = 0;

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

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

  749.                 continue;

  750.             }

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

  752.             //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);

  753.         }

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

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

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

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

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

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

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

  761.         }

  762. 

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

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

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

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

  767.                 asf_st->frag_offset = 0;

  768.                 av_free_packet(&asf_st->pkt);

  769.             }

  770.             /* new packet */

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

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

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

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

  775.             asf_st->pkt.pos =

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

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

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

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

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

  781.                 asf->packet_key_frame = 1;

  782.             if (asf->packet_key_frame)

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

  784.         }

  785. 

  786.         /* read data */

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

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

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

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

  791.         if (asf->packet_size_left < 0)

  792.             continue;

  793. 

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

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

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

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

  798.             continue;

  799.         }

  800. 

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

  802.                    asf->packet_frag_size);

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

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

  805.                             asf->packet_frag_size);

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

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

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

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

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

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

  812.                 int i;

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

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

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

  816.                     asf_st->frag_offset = 0;

  817.                     av_free_packet(&asf_st->pkt);

  818.                     continue;

  819.                 }

  820.             }

  821. 

  822.             /* return packet */

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

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

  825.                     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);

  826.               }else{

  827.                 /* packet descrambling */

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

  829.                 if (newdata) {

  830.                     int offset = 0;

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

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

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

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

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

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

  837. 

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

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

  840.                         memcpy(newdata + offset,

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

  842.                                asf_st->ds_chunk_size);

  843.                         offset += asf_st->ds_chunk_size;

  844.                     }

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

  846.                     asf_st->pkt.data = newdata;

  847.                 }

  848.               }

  849.             }

  850.             asf_st->frag_offset = 0;

  851.             *pkt= asf_st->pkt;

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

  853.             asf_st->pkt.size = 0;

  854.             asf_st->pkt.data = 0;

  855.             break; // packet completed

  856.         }

  857.     }

  858.     return 0;

  859. }

  860. 

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

  862. {

  863.     ASFContext *asf = s->priv_data;

  864. 

  865.     for (;;) {

  866.         int ret;

  867. 

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

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

  870.             return ret;

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

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

  873.         asf->packet_time_start = 0;

  874.     }

  875. 

  876.     return 0;

  877. }

  878. 

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

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

  881. // leftover information from previous reads

  882. static void asf_reset_header(AVFormatContext *s)

  883. {

  884.     ASFContext *asf = s->priv_data;

  885.     ASFStream *asf_st;

  886.     int i;

  887. 

  888.     asf->packet_nb_frames = 0;

  889.     asf->packet_size_left = 0;

  890.     asf->packet_segments = 0;

  891.     asf->packet_flags = 0;

  892.     asf->packet_property = 0;

  893.     asf->packet_timestamp = 0;

  894.     asf->packet_segsizetype = 0;

  895.     asf->packet_segments = 0;

  896.     asf->packet_seq = 0;

  897.     asf->packet_replic_size = 0;

  898.     asf->packet_key_frame = 0;

  899.     asf->packet_padsize = 0;

  900.     asf->packet_frag_offset = 0;

  901.     asf->packet_frag_size = 0;

  902.     asf->packet_frag_timestamp = 0;

  903.     asf->packet_multi_size = 0;

  904.     asf->packet_obj_size = 0;

  905.     asf->packet_time_delta = 0;

  906.     asf->packet_time_start = 0;

  907. 

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

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

  910.         av_free_packet(&asf_st->pkt);

  911.         asf_st->frag_offset=0;

  912.         asf_st->seq=0;

  913.     }

  914.     asf->asf_st= NULL;

  915. }

  916. 

  917. static int asf_read_close(AVFormatContext *s)

  918. {

  919.     int i;

  920. 

  921.     asf_reset_header(s);

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

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

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

  925.     }

  926.     return 0;

  927. }

  928. 

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

  930. {

  931.     ASFContext *asf = s->priv_data;

  932.     AVPacket pkt1, *pkt = &pkt1;

  933.     ASFStream *asf_st;

  934.     int64_t pts;

  935.     int64_t pos= *ppos;

  936.     int i;

  937.     int64_t start_pos[s->nb_streams];

  938. 

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

  940.         start_pos[i]= pos;

  941.     }

  942. 

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

  944.     *ppos= pos;

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

  946. 

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

  948.     asf_reset_header(s);

  949.     for(;;){

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

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

  952.             return AV_NOPTS_VALUE;

  953.         }

  954. 

  955.         pts= pkt->pts;

  956. 

  957.         av_free_packet(pkt);

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

  959.             i= pkt->stream_index;

  960. 

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

  962. 

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

  964.             pos= asf_st->packet_pos;

  965. 

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

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

  968. 

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

  970.                break;

  971.         }

  972.     }

  973. 

  974.     *ppos= pos;

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

  976. 

  977.     return pts;

  978. }

  979. 

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

  981. {

  982.     GUID g;

  983.     ASFContext *asf = s->priv_data;

  984.     int64_t gsize, itime;

  985.     int64_t pos, current_pos, index_pts;

  986.     int i;

  987.     int pct,ict;

  988. 

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

  990. 

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

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

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

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

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

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

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

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

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

  1000. 

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

  1002.             int pktnum=get_le32(s->pb);

  1003.             int pktct =get_le16(s->pb);

  1004.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);

  1005. 

  1006.             pos=s->data_offset + asf->packet_size*(int64_t)pktnum;

  1007.             index_pts=av_rescale(itime, i, 10000);

  1008. 

  1009.             av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);

  1010.         }

  1011.         asf->index_read= 1;

  1012.     }

  1013.     url_fseek(s->pb, current_pos, SEEK_SET);

  1014. }

  1015. 

  1016. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1017. {

  1018.     ASFContext *asf = s->priv_data;

  1019.     AVStream *st = s->streams[stream_index];

  1020.     int64_t pos;

  1021.     int index;

  1022. 

  1023.     if (asf->packet_size <= 0)

  1024.         return -1;

  1025. 

  1026.     /* Try using the protocol's read_seek if available */

  1027.     if(s->pb) {

  1028.         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);

  1029.         if(ret >= 0)

  1030.             asf_reset_header(s);

  1031.         if (ret != AVERROR(ENOSYS))

  1032.             return ret;

  1033.     }

  1034. 

  1035.     if (!asf->index_read)

  1036.         asf_build_simple_index(s, stream_index);

  1037. 

  1038.     if(!(asf->index_read && st->index_entries)){

  1039.         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)

  1040.             return -1;

  1041.     }else{

  1042.         index= av_index_search_timestamp(st, pts, flags);

  1043.         if(index<0)

  1044.             return -1;

  1045. 

  1046.         /* find the position */

  1047.         pos = st->index_entries[index].pos;

  1048.         pts = st->index_entries[index].timestamp;

  1049. 

  1050.     // various attempts to find key frame have failed so far

  1051.     //    asf_reset_header(s);

  1052.     //    url_fseek(s->pb, pos, SEEK_SET);

  1053.     //    key_pos = pos;

  1054.     //     for(i=0;i<16;i++){

  1055.     //         pos = url_ftell(s->pb);

  1056.     //         if (av_read_frame(s, &pkt) < 0){

  1057.     //             av_log(s, AV_LOG_INFO, "seek failed\n");

  1058.     //             return -1;

  1059.     //         }

  1060.     //         asf_st = s->streams[stream_index]->priv_data;

  1061.     //         pos += st->parser->frame_offset;

  1062.     //

  1063.     //         if (pkt.size > b) {

  1064.     //             b = pkt.size;

  1065.     //             key_pos = pos;

  1066.     //         }

  1067.     //

  1068.     //         av_free_packet(&pkt);

  1069.     //     }

  1070. 

  1071.         /* do the seek */

  1072.         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1073.         url_fseek(s->pb, pos, SEEK_SET);

  1074.     }

  1075.     asf_reset_header(s);

  1076.     return 0;

  1077. }

  1078. 

  1079. AVInputFormat asf_demuxer = {

  1080.     "asf",

  1081.     NULL_IF_CONFIG_SMALL("ASF format"),

  1082.     sizeof(ASFContext),

  1083.     asf_probe,

  1084.     asf_read_header,

  1085.     asf_read_packet,

  1086.     asf_read_close,

  1087.     asf_read_seek,

  1088.     asf_read_pts,

  1089.     .metadata_conv = ff_asf_metadata_conv,

  1090. };