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FFmpeg/libavformat/asfdec.c

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  1. /*

  2.  * ASF compatible demuxer

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

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. //#define DEBUG

  23. 

  24. #include "libavutil/common.h"

  25. #include "libavutil/avstring.h"

  26. #include "libavcodec/mpegaudio.h"

  27. #include "avformat.h"

  28. #include "riff.h"

  29. #include "asf.h"

  30. #include "asfcrypt.h"

  31. #include "avlanguage.h"

  32. 

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

  34. 

  35. #undef NDEBUG

  36. #include <assert.h>

  37. 

  38. #define FRAME_HEADER_SIZE 17

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

  40. 

  41. static const ff_asf_guid index_guid = {

  42.     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb

  43. };

  44. 

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

  46.     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2

  47. };

  48. /**********************************/

  49. /* decoding */

  50. 

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

  52. {

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

  54. }

  55. 

  56. #ifdef DEBUG

  57. #define PRINT_IF_GUID(g,cmp) \

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

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

  60. 

  61. static void print_guid(const ff_asf_guid *g)

  62. {

  63.     int i;

  64.     PRINT_IF_GUID(g, ff_asf_header);

  65.     else PRINT_IF_GUID(g, ff_asf_file_header);

  66.     else PRINT_IF_GUID(g, ff_asf_stream_header);

  67.     else PRINT_IF_GUID(g, ff_asf_audio_stream);

  68.     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);

  69.     else PRINT_IF_GUID(g, ff_asf_video_stream);

  70.     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);

  71.     else PRINT_IF_GUID(g, ff_asf_command_stream);

  72.     else PRINT_IF_GUID(g, ff_asf_comment_header);

  73.     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);

  74.     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);

  75.     else PRINT_IF_GUID(g, ff_asf_data_header);

  76.     else PRINT_IF_GUID(g, index_guid);

  77.     else PRINT_IF_GUID(g, ff_asf_head1_guid);

  78.     else PRINT_IF_GUID(g, ff_asf_head2_guid);

  79.     else PRINT_IF_GUID(g, ff_asf_my_guid);

  80.     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);

  81.     else PRINT_IF_GUID(g, ff_asf_extended_content_header);

  82.     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);

  83.     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);

  84.     else PRINT_IF_GUID(g, ff_asf_metadata_header);

  85.     else PRINT_IF_GUID(g, stream_bitrate_guid);

  86.     else PRINT_IF_GUID(g, ff_asf_language_guid);

  87.     else

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

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

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

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

  92. }

  93. #undef PRINT_IF_GUID

  94. #else

  95. #define print_guid(g)

  96. #endif

  97. 

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

  99. {

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

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

  102. }

  103. 

  104. #if 0

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

  106. {

  107.     int len, c;

  108.     char *q;

  109. 

  110.     len = get_le16(pb);

  111.     q = buf;

  112.     while (len > 0) {

  113.         c = get_le16(pb);

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

  115.             *q++ = c;

  116.         len--;

  117.     }

  118.     *q = '\0';

  119. }

  120. #endif

  121. 

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

  123. {

  124.     char* q = buf;

  125.     for (; len > 1; len -= 2) {

  126.         uint8_t tmp;

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

  128.     }

  129.     if (len > 0)

  130.         url_fskip(pb, len);

  131.     *q = '\0';

  132. }

  133. 

  134. static int asf_probe(AVProbeData *pd)

  135. {

  136.     /* check file header */

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

  138.         return AVPROBE_SCORE_MAX;

  139.     else

  140.         return 0;

  141. }

  142. 

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

  144.     switch(type){

  145.         case 2: return get_le32(pb);

  146.         case 3: return get_le32(pb);

  147.         case 4: return get_le64(pb);

  148.         case 5: return get_le16(pb);

  149.         default:return INT_MIN;

  150.     }

  151. }

  152. 

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

  154. {

  155.     char *value;

  156. 

  157.     if ((unsigned)len >= UINT_MAX)

  158.         return;

  159. 

  160.     value = av_malloc(len+1);

  161.     if (!value)

  162.         return;

  163. 

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

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

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

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

  168.         snprintf(value, len, "%"PRIu64, num);

  169.     } else {

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

  171.         av_freep(&value);

  172.         return;

  173.     }

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

  175.         key += 3;

  176.     av_metadata_set2(&s->metadata, key, value, AV_METADATA_DONT_STRDUP_VAL);

  177. }

  178. 

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

  180. {

  181.     ASFContext *asf = s->priv_data;

  182.     ff_asf_guid g;

  183.     ByteIOContext *pb = s->pb;

  184.     AVStream *st;

  185.     ASFStream *asf_st;

  186.     int size, i;

  187.     int64_t gsize;

  188.     AVRational dar[128];

  189.     uint32_t bitrate[128];

  190. 

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

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

  193. 

  194.     get_guid(pb, &g);

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

  196.         return -1;

  197.     get_le64(pb);

  198.     get_le32(pb);

  199.     get_byte(pb);

  200.     get_byte(pb);

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

  202.     for(;;) {

  203.         get_guid(pb, &g);

  204.         gsize = get_le64(pb);

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

  206.         print_guid(&g);

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

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

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

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

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

  212.                 asf->data_object_size = gsize - 24;

  213.             } else {

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

  215.             }

  216.             break;

  217.         }

  218.         if (gsize < 24)

  219.             return -1;

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

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

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

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

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

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

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

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

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

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

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

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

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

  233.             s->packet_size = asf->hdr.max_pktsize;

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

  235.             enum CodecType type;

  236.             int type_specific_size, sizeX;

  237.             uint64_t total_size;

  238.             unsigned int tag1;

  239.             int64_t pos1, pos2, start_time;

  240.             int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  241. 

  242.             pos1 = url_ftell(pb);

  243. 

  244.             st = av_new_stream(s, 0);

  245.             if (!st)

  246.                 return AVERROR(ENOMEM);

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

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

  249.             if (!asf_st)

  250.                 return AVERROR(ENOMEM);

  251.             st->priv_data = asf_st;

  252.             start_time = asf->hdr.preroll;

  253. 

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

  255. 

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

  257.                 st->duration = asf->hdr.play_time /

  258.                     (10000000 / 1000) - start_time;

  259.             }

  260.             get_guid(pb, &g);

  261. 

  262.             test_for_ext_stream_audio = 0;

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

  264.                 type = CODEC_TYPE_AUDIO;

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

  266.                 type = CODEC_TYPE_VIDEO;

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

  268.                 type = CODEC_TYPE_DATA;

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

  270.                 test_for_ext_stream_audio = 1;

  271.                 type = CODEC_TYPE_UNKNOWN;

  272.             } else {

  273.                 return -1;

  274.             }

  275.             get_guid(pb, &g);

  276.             total_size = get_le64(pb);

  277.             type_specific_size = get_le32(pb);

  278.             get_le32(pb);

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

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

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

  282. 

  283.             get_le32(pb);

  284. 

  285.             if (test_for_ext_stream_audio) {

  286.                 get_guid(pb, &g);

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

  288.                     type = CODEC_TYPE_AUDIO;

  289.                     is_dvr_ms_audio=1;

  290.                     get_guid(pb, &g);

  291.                     get_le32(pb);

  292.                     get_le32(pb);

  293.                     get_le32(pb);

  294.                     get_guid(pb, &g);

  295.                     get_le32(pb);

  296.                 }

  297.             }

  298. 

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

  300.             if (type == CODEC_TYPE_AUDIO) {

  301.                 ff_get_wav_header(pb, st->codec, type_specific_size);

  302.                 if (is_dvr_ms_audio) {

  303.                     // codec_id and codec_tag are unreliable in dvr_ms

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

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

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

  307.                 }

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

  309.                     st->need_parsing = AVSTREAM_PARSE_NONE;

  310.                 } else {

  311.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  312.                 }

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

  314.                 pos2 = url_ftell(pb);

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

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

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

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

  319.                     get_le16(pb); //ds_data_size

  320.                     get_byte(pb); //ds_silence_data

  321.                 }

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

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

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

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

  326.                     if (!asf_st->ds_chunk_size

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

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

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

  330.                 }

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

  332.                 case CODEC_ID_MP3:

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

  334.                     break;

  335.                 case CODEC_ID_PCM_S16LE:

  336.                 case CODEC_ID_PCM_S16BE:

  337.                 case CODEC_ID_PCM_U16LE:

  338.                 case CODEC_ID_PCM_U16BE:

  339.                 case CODEC_ID_PCM_S8:

  340.                 case CODEC_ID_PCM_U8:

  341.                 case CODEC_ID_PCM_ALAW:

  342.                 case CODEC_ID_PCM_MULAW:

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

  344.                     break;

  345.                 default:

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

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

  348.                     break;

  349.                 }

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

  351.                 get_le32(pb);

  352.                 get_le32(pb);

  353.                 get_byte(pb);

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

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

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

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

  358.                 /* not available for asf */

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

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

  361.                 tag1 = get_le32(pb);

  362.                 url_fskip(pb, 20);

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

  364.                 size= sizeX;

  365.                 if (size > 40) {

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

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

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

  369.                 }

  370. 

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

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

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

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

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

  376. #if HAVE_BIGENDIAN

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

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

  379. #else

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

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

  382. #endif

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

  384.                 }

  385. 

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

  387.                 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);

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

  389.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  390.             }

  391.             pos2 = url_ftell(pb);

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

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

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

  395. 

  396.             len1 = get_le16(pb);

  397.             len2 = get_le16(pb);

  398.             len3 = get_le16(pb);

  399.             len4 = get_le16(pb);

  400.             len5 = get_le16(pb);

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

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

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

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

  405.             url_fskip(pb, len5);

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

  407.             int stream_count = get_le16(pb);

  408.             int j;

  409. 

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

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

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

  413.                 int flags, bitrate, stream_id;

  414. 

  415.                 flags= get_le16(pb);

  416.                 bitrate= get_le32(pb);

  417.                 stream_id= (flags & 0x7f);

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

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

  420.             }

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

  422.             int j;

  423.             int stream_count = get_le16(pb);

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

  425.                 char lang[6];

  426.                 unsigned int lang_len = get_byte(pb);

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

  428.                 if (j < 128)

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

  430.             }

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

  432.             int desc_count, i;

  433. 

  434.             desc_count = get_le16(pb);

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

  436.                     int name_len,value_type,value_len;

  437.                     char name[1024];

  438. 

  439.                     name_len = get_le16(pb);

  440.                     if (name_len%2)     // must be even, broken lavf versions wrote len-1

  441.                         name_len += 1;

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

  443.                     value_type = get_le16(pb);

  444.                     value_len  = get_le16(pb);

  445.                     if (!value_type && value_len%2)

  446.                         value_len += 1;

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

  448.             }

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

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

  451.             n = get_le16(pb);

  452. 

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

  454.                 char name[1024];

  455. 

  456.                 get_le16(pb); //lang_list_index

  457.                 stream_num= get_le16(pb);

  458.                 name_len=   get_le16(pb);

  459.                 value_type= get_le16(pb);

  460.                 value_len=  get_le32(pb);

  461. 

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

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

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

  465.                 url_fskip(pb, value_len - 2);

  466. 

  467.                 if(stream_num<128){

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

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

  470.                 }

  471.             }

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

  473.             int ext_len, payload_ext_ct, stream_ct;

  474.             uint32_t ext_d, leak_rate, stream_num;

  475.             unsigned int stream_languageid_index;

  476. 

  477.             get_le64(pb); // starttime

  478.             get_le64(pb); // endtime

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

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

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

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

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

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

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

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

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

  488. 

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

  490.             if (stream_num < 128)

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

  492. 

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

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

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

  496. 

  497.             if (stream_num < 128)

  498.                 bitrate[stream_num] = leak_rate;

  499. 

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

  501.                 get_le16(pb);

  502.                 ext_len = get_le16(pb);

  503.                 url_fseek(pb, ext_len, SEEK_CUR);

  504.             }

  505. 

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

  507.                 get_guid(pb, &g);

  508.                 ext_d=get_le16(pb);

  509.                 ext_len=get_le32(pb);

  510.                 url_fseek(pb, ext_len, SEEK_CUR);

  511.             }

  512. 

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

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

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

  516.             int v1, v2;

  517.             get_guid(pb, &g);

  518.             v1 = get_le32(pb);

  519.             v2 = get_le16(pb);

  520. #if 0

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

  522.             int len, v1, n, num;

  523.             char str[256], *q;

  524.             char tag[16];

  525. 

  526.             get_guid(pb, &g);

  527.             print_guid(&g);

  528. 

  529.             n = get_le32(pb);

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

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

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

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

  534.                 len = get_le16(pb);

  535.                 q = tag;

  536.                 while (len > 0) {

  537.                     v1 = get_byte(pb);

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

  539.                         *q++ = v1;

  540.                     len--;

  541.                 }

  542.                 *q = '\0';

  543.             }

  544. #endif

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

  546.             return -1;

  547.         } else {

  548.             if (!s->keylen) {

  549.                 if (!guidcmp(&g, &ff_asf_content_encryption)) {

  550.                     av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");

  551.                 } else if (!guidcmp(&g, &ff_asf_ext_content_encryption)) {

  552.                     av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");

  553.                 } else if (!guidcmp(&g, &ff_asf_digital_signature)) {

  554.                     av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");

  555.                 }

  556.             }

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

  558.         }

  559.     }

  560.     get_guid(pb, &g);

  561.     get_le64(pb);

  562.     get_byte(pb);

  563.     get_byte(pb);

  564.     if (url_feof(pb))

  565.         return -1;

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

  567.     asf->packet_size_left = 0;

  568. 

  569. 

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

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

  572.         if(stream_num>=0){

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

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

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

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

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

  578.                           &st->sample_aspect_ratio.den,

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

  580. //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);

  581. 

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

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

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

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

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

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

  588.                     if (iso6392)

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

  590.                 }

  591.             }

  592.         }

  593.     }

  594. 

  595.     return 0;

  596. }

  597. 

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

  599.     switch (bits & 3) \

  600.     { \

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

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

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

  604.     default: var = defval; break; \

  605.     }

  606. 

  607. /**

  608.  * Load a single ASF packet into the demuxer.

  609.  * @param s demux context

  610.  * @param pb context to read data from

  611.  * @returns 0 on success, <0 on error

  612.  */

  613. static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)

  614. {

  615.     ASFContext *asf = s->priv_data;

  616.     uint32_t packet_length, padsize;

  617.     int rsize = 8;

  618.     int c, d, e, off;

  619. 

  620.     // if we do not know packet size, allow skipping up to 32 kB

  621.     off= 32768;

  622.     if (s->packet_size > 0)

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

  624. 

  625.     c=d=e=-1;

  626.     while(off-- > 0){

  627.         c=d; d=e;

  628.         e= get_byte(pb);

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

  630.             break;

  631.     }

  632. 

  633.     if (c != 0x82) {

  634.         /**

  635.          * This code allows handling of -EAGAIN at packet boundaries (i.e.

  636.          * if the packet sync code above triggers -EAGAIN). This does not

  637.          * imply complete -EAGAIN handling support at random positions in

  638.          * the stream.

  639.          */

  640.         if (url_ferror(pb) == AVERROR(EAGAIN))

  641.             return AVERROR(EAGAIN);

  642.         if (!url_feof(pb))

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

  644.     }

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

  646.         if (d || e) {

  647.             if (!url_feof(pb))

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

  649.             return -1;

  650.         }

  651.         c= get_byte(pb);

  652.         d= get_byte(pb);

  653.         rsize+=3;

  654.     }else{

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

  656.     }

  657. 

  658.     asf->packet_flags    = c;

  659.     asf->packet_property = d;

  660. 

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

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

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

  664. 

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

  666.     if(!packet_length || packet_length >= (1U<<29)){

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

  668.         return -1;

  669.     }

  670.     if(padsize >= packet_length){

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

  672.         return -1;

  673.     }

  674. 

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

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

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

  678. 

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

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

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

  682.     } else {

  683.         asf->packet_segments = 1;

  684.         asf->packet_segsizetype = 0x80;

  685.     }

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

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

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

  689.     asf->packet_padsize = padsize;

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

  691.     return 0;

  692. }

  693. 

  694. /**

  695.  *

  696.  * @return <0 if error

  697.  */

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

  699.     ASFContext *asf = s->priv_data;

  700.     int rsize = 1;

  701.     int num = get_byte(pb);

  702.     int64_t ts0, ts1;

  703. 

  704.     asf->packet_segments--;

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

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

  707.     // sequence should be ignored!

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

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

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

  711. //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);

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

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

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

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

  716.             return -1;

  717.         }

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

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

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

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

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

  723.             url_fskip(pb, 10);

  724.             ts0= get_le64(pb);

  725.             ts1= get_le64(pb);

  726.             url_fskip(pb, 12);

  727.             get_le32(pb);

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

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

  730.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  731.         }else

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

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

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

  735.         // multipacket - frag_offset is beginning timestamp

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

  737.         asf->packet_frag_offset = 0;

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

  739. 

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

  741.         rsize++;

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

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

  744.         return -1;

  745.     }

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

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

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

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

  750.             return -1;

  751.         }

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

  753.     } else {

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

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

  756.     }

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

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

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

  760.             return -1;

  761.     }

  762.     asf->packet_size_left -= rsize;

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

  764. 

  765.     return 0;

  766. }

  767. 

  768. /**

  769.  * Parse data from individual ASF packets (which were previously loaded

  770.  * with asf_get_packet()).

  771.  * @param s demux context

  772.  * @param pb context to read data from

  773.  * @param pkt pointer to store packet data into

  774.  * @returns 0 if data was stored in pkt, <0 on error or 1 if more ASF

  775.  *          packets need to be loaded (through asf_get_packet())

  776.  */

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

  778. {

  779.     ASFContext *asf = s->priv_data;

  780.     ASFStream *asf_st = 0;

  781.     for (;;) {

  782.         if(url_feof(pb))

  783.             return AVERROR_EOF;

  784.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  789.             assert(ret>=0);

  790.             /* fail safe */

  791.             url_fskip(pb, ret);

  792. 

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

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

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

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

  797.             return 1;

  798.         }

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

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

  801.                 asf->packet_segments= 0;

  802.                 continue;

  803.             }

  804.             if (asf->stream_index < 0

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

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

  807.                 ) {

  808.                 asf->packet_time_start = 0;

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

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

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

  812.                 if(asf->stream_index < 0)

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

  814.                 continue;

  815.             }

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

  817.         }

  818.         asf_st = asf->asf_st;

  819. 

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

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

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

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

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

  825.             asf->packet_size_left--;

  826.             asf->packet_multi_size--;

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

  828.             {

  829.                 asf->packet_time_start = 0;

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

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

  832.                 continue;

  833.             }

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

  835.             //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);

  836.         }

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

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

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

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

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

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

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

  844.         }

  845. 

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

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

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

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

  850.                 asf_st->frag_offset = 0;

  851.                 av_free_packet(&asf_st->pkt);

  852.             }

  853.             /* new packet */

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

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

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

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

  858.             asf_st->pkt.pos =

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

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

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

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

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

  864.                 asf->packet_key_frame = 1;

  865.             if (asf->packet_key_frame)

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

  867.         }

  868. 

  869.         /* read data */

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

  871.         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,

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

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

  874.         if (asf->packet_size_left < 0)

  875.             continue;

  876. 

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

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

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

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

  881.             continue;

  882.         }

  883. 

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

  885.                    asf->packet_frag_size);

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

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

  888.                             asf->packet_frag_size);

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

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

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

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

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

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

  895.                 int i;

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

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

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

  899.                     asf_st->frag_offset = 0;

  900.                     av_free_packet(&asf_st->pkt);

  901.                     continue;

  902.                 }

  903.             }

  904. 

  905.             /* return packet */

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

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

  908.                     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);

  909.               }else{

  910.                 /* packet descrambling */

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

  912.                 if (newdata) {

  913.                     int offset = 0;

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

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

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

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

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

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

  920. 

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

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

  923.                         memcpy(newdata + offset,

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

  925.                                asf_st->ds_chunk_size);

  926.                         offset += asf_st->ds_chunk_size;

  927.                     }

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

  929.                     asf_st->pkt.data = newdata;

  930.                 }

  931.               }

  932.             }

  933.             asf_st->frag_offset = 0;

  934.             *pkt= asf_st->pkt;

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

  936.             asf_st->pkt.size = 0;

  937.             asf_st->pkt.data = 0;

  938.             break; // packet completed

  939.         }

  940.     }

  941.     return 0;

  942. }

  943. 

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

  945. {

  946.     ASFContext *asf = s->priv_data;

  947. 

  948.     for (;;) {

  949.         int ret;

  950. 

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

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

  953.             return ret;

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

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

  956.         asf->packet_time_start = 0;

  957.     }

  958. 

  959.     return 0;

  960. }

  961. 

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

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

  964. // leftover information from previous reads

  965. static void asf_reset_header(AVFormatContext *s)

  966. {

  967.     ASFContext *asf = s->priv_data;

  968.     ASFStream *asf_st;

  969.     int i;

  970. 

  971.     asf->packet_nb_frames = 0;

  972.     asf->packet_size_left = 0;

  973.     asf->packet_segments = 0;

  974.     asf->packet_flags = 0;

  975.     asf->packet_property = 0;

  976.     asf->packet_timestamp = 0;

  977.     asf->packet_segsizetype = 0;

  978.     asf->packet_segments = 0;

  979.     asf->packet_seq = 0;

  980.     asf->packet_replic_size = 0;

  981.     asf->packet_key_frame = 0;

  982.     asf->packet_padsize = 0;

  983.     asf->packet_frag_offset = 0;

  984.     asf->packet_frag_size = 0;

  985.     asf->packet_frag_timestamp = 0;

  986.     asf->packet_multi_size = 0;

  987.     asf->packet_obj_size = 0;

  988.     asf->packet_time_delta = 0;

  989.     asf->packet_time_start = 0;

  990. 

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

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

  993.         av_free_packet(&asf_st->pkt);

  994.         asf_st->frag_offset=0;

  995.         asf_st->seq=0;

  996.     }

  997.     asf->asf_st= NULL;

  998. }

  999. 

  1000. static int asf_read_close(AVFormatContext *s)

  1001. {

  1002.     int i;

  1003. 

  1004.     asf_reset_header(s);

  1005.     for(i=0;i<s->nb_streams;i++) {

  1006.         AVStream *st = s->streams[i];

  1007.         av_free(st->codec->palctrl);

  1008.     }

  1009.     return 0;

  1010. }

  1011. 

  1012. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  1013. {

  1014.     AVPacket pkt1, *pkt = &pkt1;

  1015.     ASFStream *asf_st;

  1016.     int64_t pts;

  1017.     int64_t pos= *ppos;

  1018.     int i;

  1019.     int64_t start_pos[s->nb_streams];

  1020. 

  1021.     for(i=0; i<s->nb_streams; i++){

  1022.         start_pos[i]= pos;

  1023.     }

  1024. 

  1025.     if (s->packet_size > 0)

  1026.         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;

  1027.     *ppos= pos;

  1028.     url_fseek(s->pb, pos, SEEK_SET);

  1029. 

  1030. //printf("asf_read_pts\n");

  1031.     asf_reset_header(s);

  1032.     for(;;){

  1033.         if (av_read_frame(s, pkt) < 0){

  1034.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1035.             return AV_NOPTS_VALUE;

  1036.         }

  1037. 

  1038.         pts= pkt->pts;

  1039. 

  1040.         av_free_packet(pkt);

  1041.         if(pkt->flags&PKT_FLAG_KEY){

  1042.             i= pkt->stream_index;

  1043. 

  1044.             asf_st= s->streams[i]->priv_data;

  1045. 

  1046. //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);

  1047.             pos= asf_st->packet_pos;

  1048. 

  1049.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1050.             start_pos[i]= asf_st->packet_pos + 1;

  1051. 

  1052.             if(pkt->stream_index == stream_index)

  1053.                break;

  1054.         }

  1055.     }

  1056. 

  1057.     *ppos= pos;

  1058. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1059. 

  1060.     return pts;

  1061. }

  1062. 

  1063. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1064. {

  1065.     ff_asf_guid g;

  1066.     ASFContext *asf = s->priv_data;

  1067.     int64_t current_pos= url_ftell(s->pb);

  1068.     int i;

  1069. 

  1070.     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);

  1071.     get_guid(s->pb, &g);

  1072.     if (!guidcmp(&g, &index_guid)) {

  1073.         int64_t itime, last_pos=-1;

  1074.         int pct, ict;

  1075.         int64_t av_unused gsize= get_le64(s->pb);

  1076.         get_guid(s->pb, &g);

  1077.         itime=get_le64(s->pb);

  1078.         pct=get_le32(s->pb);

  1079.         ict=get_le32(s->pb);

  1080.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1081. 

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

  1083.             int pktnum=get_le32(s->pb);

  1084.             int pktct =get_le16(s->pb);

  1085.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1086.             int64_t index_pts= av_rescale(itime, i, 10000);

  1087. 

  1088.             if(pos != last_pos){

  1089.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);

  1090.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1091.             last_pos=pos;

  1092.             }

  1093.         }

  1094.         asf->index_read= 1;

  1095.     }

  1096.     url_fseek(s->pb, current_pos, SEEK_SET);

  1097. }

  1098. 

  1099. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1100. {

  1101.     ASFContext *asf = s->priv_data;

  1102.     AVStream *st = s->streams[stream_index];

  1103.     int64_t pos;

  1104.     int index;

  1105. 

  1106.     if (s->packet_size <= 0)

  1107.         return -1;

  1108. 

  1109.     /* Try using the protocol's read_seek if available */

  1110.     if(s->pb) {

  1111.         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);

  1112.         if(ret >= 0)

  1113.             asf_reset_header(s);

  1114.         if (ret != AVERROR(ENOSYS))

  1115.             return ret;

  1116.     }

  1117. 

  1118.     if (!asf->index_read)

  1119.         asf_build_simple_index(s, stream_index);

  1120. 

  1121.     if(!(asf->index_read && st->index_entries)){

  1122.         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)

  1123.             return -1;

  1124.     }else{

  1125.         index= av_index_search_timestamp(st, pts, flags);

  1126.         if(index<0)

  1127.             return -1;

  1128. 

  1129.         /* find the position */

  1130.         pos = st->index_entries[index].pos;

  1131. 

  1132.     // various attempts to find key frame have failed so far

  1133.     //    asf_reset_header(s);

  1134.     //    url_fseek(s->pb, pos, SEEK_SET);

  1135.     //    key_pos = pos;

  1136.     //     for(i=0;i<16;i++){

  1137.     //         pos = url_ftell(s->pb);

  1138.     //         if (av_read_frame(s, &pkt) < 0){

  1139.     //             av_log(s, AV_LOG_INFO, "seek failed\n");

  1140.     //             return -1;

  1141.     //         }

  1142.     //         asf_st = s->streams[stream_index]->priv_data;

  1143.     //         pos += st->parser->frame_offset;

  1144.     //

  1145.     //         if (pkt.size > b) {

  1146.     //             b = pkt.size;

  1147.     //             key_pos = pos;

  1148.     //         }

  1149.     //

  1150.     //         av_free_packet(&pkt);

  1151.     //     }

  1152. 

  1153.         /* do the seek */

  1154.         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1155.         url_fseek(s->pb, pos, SEEK_SET);

  1156.     }

  1157.     asf_reset_header(s);

  1158.     return 0;

  1159. }

  1160. 

  1161. AVInputFormat asf_demuxer = {

  1162.     "asf",

  1163.     NULL_IF_CONFIG_SMALL("ASF format"),

  1164.     sizeof(ASFContext),

  1165.     asf_probe,

  1166.     asf_read_header,

  1167.     asf_read_packet,

  1168.     asf_read_close,

  1169.     asf_read_seek,

  1170.     asf_read_pts,

  1171.     .metadata_conv = ff_asf_metadata_conv,

  1172. };