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FFmpeg/libavformat/asfdec.c

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  1. /*

  2.  * ASF compatible demuxer

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

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. #include "libavutil/common.h"

  23. #include "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.                 {

  407.                         int name_len,value_type,value_len;

  408.                         char name[1024];

  409. 

  410.                         name_len = get_le16(pb);

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

  412.                         value_type = get_le16(pb);

  413.                         value_len = get_le16(pb);

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

  415.                 }

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

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

  418.             n = get_le16(pb);

  419. 

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

  421.                 char name[1024];

  422. 

  423.                 get_le16(pb); //lang_list_index

  424.                 stream_num= get_le16(pb);

  425.                 name_len=   get_le16(pb);

  426.                 value_type= get_le16(pb);

  427.                 value_len=  get_le32(pb);

  428. 

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

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

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

  432.                 url_fskip(pb, value_len - 2);

  433. 

  434.                 if(stream_num<128){

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

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

  437.                 }

  438.             }

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

  440.             int ext_len, payload_ext_ct, stream_ct;

  441.             uint32_t ext_d, leak_rate, stream_num;

  442.             int64_t pos_ex_st;

  443.             pos_ex_st = url_ftell(pb);

  444. 

  445.             get_le64(pb); // starttime

  446.             get_le64(pb); // endtime

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

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

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

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

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

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

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

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

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

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

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

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

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

  460. 

  461.             if (stream_num < 128)

  462.                 bitrate[stream_num] = leak_rate;

  463. 

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

  465.                 get_le16(pb);

  466.                 ext_len = get_le16(pb);

  467.                 url_fseek(pb, ext_len, SEEK_CUR);

  468.             }

  469. 

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

  471.                 get_guid(pb, &g);

  472.                 ext_d=get_le16(pb);

  473.                 ext_len=get_le32(pb);

  474.                 url_fseek(pb, ext_len, SEEK_CUR);

  475.             }

  476. 

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

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

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

  480.             int v1, v2;

  481.             get_guid(pb, &g);

  482.             v1 = get_le32(pb);

  483.             v2 = get_le16(pb);

  484. #if 0

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

  486.             int len, v1, n, num;

  487.             char str[256], *q;

  488.             char tag[16];

  489. 

  490.             get_guid(pb, &g);

  491.             print_guid(&g);

  492. 

  493.             n = get_le32(pb);

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

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

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

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

  498.                 len = get_le16(pb);

  499.                 q = tag;

  500.                 while (len > 0) {

  501.                     v1 = get_byte(pb);

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

  503.                         *q++ = v1;

  504.                     len--;

  505.                 }

  506.                 *q = '\0';

  507.             }

  508. #endif

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

  510.             return -1;

  511.         } else {

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

  513.         }

  514.     }

  515.     get_guid(pb, &g);

  516.     get_le64(pb);

  517.     get_byte(pb);

  518.     get_byte(pb);

  519.     if (url_feof(pb))

  520.         return -1;

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

  522.     asf->packet_size_left = 0;

  523. 

  524. 

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

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

  527.         if(stream_num>=0){

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

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

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

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

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

  533.                           &st->sample_aspect_ratio.den,

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

  535. //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);

  536.         }

  537.     }

  538. 

  539.     return 0;

  540. }

  541. 

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

  543.     switch (bits & 3) \

  544.     { \

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

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

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

  548.     default: var = defval; break; \

  549.     }

  550. 

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

  552. {

  553.     ASFContext *asf = s->priv_data;

  554.     uint32_t packet_length, padsize;

  555.     int rsize = 8;

  556.     int c, d, e, off;

  557. 

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

  559. 

  560.     c=d=e=-1;

  561.     while(off-- > 0){

  562.         c=d; d=e;

  563.         e= get_byte(pb);

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

  565.             break;

  566.     }

  567. 

  568.     if (c != 0x82) {

  569.         if (!url_feof(pb))

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

  571.     }

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

  573.         if (d || e) {

  574.             if (!url_feof(pb))

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

  576.             return -1;

  577.         }

  578.         c= get_byte(pb);

  579.         d= get_byte(pb);

  580.         rsize+=3;

  581.     }else{

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

  583.     }

  584. 

  585.     asf->packet_flags    = c;

  586.     asf->packet_property = d;

  587. 

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

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

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

  591. 

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

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

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

  595.         return -1;

  596.     }

  597.     if(padsize >= packet_length){

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

  599.         return -1;

  600.     }

  601. 

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

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

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

  605. 

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

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

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

  609.     } else {

  610.         asf->packet_segments = 1;

  611.         asf->packet_segsizetype = 0x80;

  612.     }

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

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

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

  616.     asf->packet_padsize = padsize;

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

  618.     return 0;

  619. }

  620. 

  621. /**

  622.  *

  623.  * @return <0 if error

  624.  */

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

  626.     ASFContext *asf = s->priv_data;

  627.     int rsize = 1;

  628.     int num = get_byte(pb);

  629.     int64_t ts0, ts1;

  630. 

  631.     asf->packet_segments--;

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

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

  634.     // sequence should be ignored!

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

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

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

  638. //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);

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

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

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

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

  643.             return -1;

  644.         }

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

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

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

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

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

  650.             url_fskip(pb, 10);

  651.             ts0= get_le64(pb);

  652.             ts1= get_le64(pb);

  653.             url_fskip(pb, 12);

  654.             get_le32(pb);

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

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

  657.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  658.         }else

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

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

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

  662.         // multipacket - frag_offset is beginning timestamp

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

  664.         asf->packet_frag_offset = 0;

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

  666. 

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

  668.         rsize++;

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

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

  671.         return -1;

  672.     }

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

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

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

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

  677.             return -1;

  678.         }

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

  680.     } else {

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

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

  683.     }

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

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

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

  687.             return -1;

  688.     }

  689.     asf->packet_size_left -= rsize;

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

  691. 

  692.     return 0;

  693. }

  694. 

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

  696. {

  697.     ASFContext *asf = s->priv_data;

  698.     ASFStream *asf_st = 0;

  699.     for (;;) {

  700.         if(url_feof(pb))

  701.             return AVERROR(EIO);

  702.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  707.             assert(ret>=0);

  708.             /* fail safe */

  709.             url_fskip(pb, ret);

  710. 

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

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

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

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

  715.             return 1;

  716.         }

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

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

  719.                 asf->packet_segments= 0;

  720.                 continue;

  721.             }

  722.             if (asf->stream_index < 0

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

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

  725.                 ) {

  726.                 asf->packet_time_start = 0;

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

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

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

  730.                 if(asf->stream_index < 0)

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

  732.                 continue;

  733.             }

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

  735.         }

  736.         asf_st = asf->asf_st;

  737. 

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

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

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

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

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

  743.             asf->packet_size_left--;

  744.             asf->packet_multi_size--;

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

  746.             {

  747.                 asf->packet_time_start = 0;

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

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

  750.                 continue;

  751.             }

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

  753.             //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);

  754.         }

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

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

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

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

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

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

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

  762.         }

  763. 

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

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

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

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

  768.                 asf_st->frag_offset = 0;

  769.                 av_free_packet(&asf_st->pkt);

  770.             }

  771.             /* new packet */

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

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

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

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

  776.             asf_st->pkt.pos =

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

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

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

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

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

  782.                 asf->packet_key_frame = 1;

  783.             if (asf->packet_key_frame)

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

  785.         }

  786. 

  787.         /* read data */

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

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

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

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

  792.         if (asf->packet_size_left < 0)

  793.             continue;

  794. 

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

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

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

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

  799.             continue;

  800.         }

  801. 

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

  803.                    asf->packet_frag_size);

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

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

  806.                             asf->packet_frag_size);

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

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

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

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

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

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

  813.                 int i;

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

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

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

  817.                     asf_st->frag_offset = 0;

  818.                     av_free_packet(&asf_st->pkt);

  819.                     continue;

  820.                 }

  821.             }

  822. 

  823.             /* return packet */

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

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

  826.                     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);

  827.               }else{

  828.                 /* packet descrambling */

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

  830.                 if (newdata) {

  831.                     int offset = 0;

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

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

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

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

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

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

  838. 

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

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

  841.                         memcpy(newdata + offset,

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

  843.                                asf_st->ds_chunk_size);

  844.                         offset += asf_st->ds_chunk_size;

  845.                     }

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

  847.                     asf_st->pkt.data = newdata;

  848.                 }

  849.               }

  850.             }

  851.             asf_st->frag_offset = 0;

  852.             *pkt= asf_st->pkt;

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

  854.             asf_st->pkt.size = 0;

  855.             asf_st->pkt.data = 0;

  856.             break; // packet completed

  857.         }

  858.     }

  859.     return 0;

  860. }

  861. 

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

  863. {

  864.     ASFContext *asf = s->priv_data;

  865. 

  866.     for (;;) {

  867.         int ret;

  868. 

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

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

  871.             return ret;

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

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

  874.         asf->packet_time_start = 0;

  875.     }

  876. 

  877.     return 0;

  878. }

  879. 

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

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

  882. // leftover information from previous reads

  883. static void asf_reset_header(AVFormatContext *s)

  884. {

  885.     ASFContext *asf = s->priv_data;

  886.     ASFStream *asf_st;

  887.     int i;

  888. 

  889.     asf->packet_nb_frames = 0;

  890.     asf->packet_size_left = 0;

  891.     asf->packet_segments = 0;

  892.     asf->packet_flags = 0;

  893.     asf->packet_property = 0;

  894.     asf->packet_timestamp = 0;

  895.     asf->packet_segsizetype = 0;

  896.     asf->packet_segments = 0;

  897.     asf->packet_seq = 0;

  898.     asf->packet_replic_size = 0;

  899.     asf->packet_key_frame = 0;

  900.     asf->packet_padsize = 0;

  901.     asf->packet_frag_offset = 0;

  902.     asf->packet_frag_size = 0;

  903.     asf->packet_frag_timestamp = 0;

  904.     asf->packet_multi_size = 0;

  905.     asf->packet_obj_size = 0;

  906.     asf->packet_time_delta = 0;

  907.     asf->packet_time_start = 0;

  908. 

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

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

  911.         av_free_packet(&asf_st->pkt);

  912.         asf_st->frag_offset=0;

  913.         asf_st->seq=0;

  914.     }

  915.     asf->asf_st= NULL;

  916. }

  917. 

  918. static int asf_read_close(AVFormatContext *s)

  919. {

  920.     int i;

  921. 

  922.     asf_reset_header(s);

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

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

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

  926.     }

  927.     return 0;

  928. }

  929. 

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

  931. {

  932.     ASFContext *asf = s->priv_data;

  933.     AVPacket pkt1, *pkt = &pkt1;

  934.     ASFStream *asf_st;

  935.     int64_t pts;

  936.     int64_t pos= *ppos;

  937.     int i;

  938.     int64_t start_pos[s->nb_streams];

  939. 

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

  941.         start_pos[i]= pos;

  942.     }

  943. 

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

  945.     *ppos= pos;

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

  947. 

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

  949.     asf_reset_header(s);

  950.     for(;;){

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

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

  953.             return AV_NOPTS_VALUE;

  954.         }

  955. 

  956.         pts= pkt->pts;

  957. 

  958.         av_free_packet(pkt);

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

  960.             i= pkt->stream_index;

  961. 

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

  963. 

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

  965.             pos= asf_st->packet_pos;

  966. 

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

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

  969. 

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

  971.                break;

  972.         }

  973.     }

  974. 

  975.     *ppos= pos;

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

  977. 

  978.     return pts;

  979. }

  980. 

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

  982. {

  983.     GUID g;

  984.     ASFContext *asf = s->priv_data;

  985.     int64_t gsize, itime;

  986.     int64_t pos, current_pos, index_pts;

  987.     int i;

  988.     int pct,ict;

  989. 

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

  991. 

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

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

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

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

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

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

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

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

  1000.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1001. 

  1002.         for (i=0;i<ict;i++){

  1003.             int pktnum=get_le32(s->pb);

  1004.             int pktct =get_le16(s->pb);

  1005.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);

  1006. 

  1007.             pos=s->data_offset + asf->packet_size*(int64_t)pktnum;

  1008.             index_pts=av_rescale(itime, i, 10000);

  1009. 

  1010.             av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);

  1011.         }

  1012.         asf->index_read= 1;

  1013.     }

  1014.     url_fseek(s->pb, current_pos, SEEK_SET);

  1015. }

  1016. 

  1017. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1018. {

  1019.     ASFContext *asf = s->priv_data;

  1020.     AVStream *st = s->streams[stream_index];

  1021.     int64_t pos;

  1022.     int index;

  1023. 

  1024.     if (asf->packet_size <= 0)

  1025.         return -1;

  1026. 

  1027.     /* Try using the protocol's read_seek if available */

  1028.     if(s->pb) {

  1029.         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);

  1030.         if(ret >= 0)

  1031.             asf_reset_header(s);

  1032.         if (ret != AVERROR(ENOSYS))

  1033.             return ret;

  1034.     }

  1035. 

  1036.     if (!asf->index_read)

  1037.         asf_build_simple_index(s, stream_index);

  1038. 

  1039.     if(!(asf->index_read && st->index_entries)){

  1040.         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)

  1041.             return -1;

  1042.     }else{

  1043.         index= av_index_search_timestamp(st, pts, flags);

  1044.         if(index<0)

  1045.             return -1;

  1046. 

  1047.         /* find the position */

  1048.         pos = st->index_entries[index].pos;

  1049.         pts = st->index_entries[index].timestamp;

  1050. 

  1051.     // various attempts to find key frame have failed so far

  1052.     //    asf_reset_header(s);

  1053.     //    url_fseek(s->pb, pos, SEEK_SET);

  1054.     //    key_pos = pos;

  1055.     //     for(i=0;i<16;i++){

  1056.     //         pos = url_ftell(s->pb);

  1057.     //         if (av_read_frame(s, &pkt) < 0){

  1058.     //             av_log(s, AV_LOG_INFO, "seek failed\n");

  1059.     //             return -1;

  1060.     //         }

  1061.     //         asf_st = s->streams[stream_index]->priv_data;

  1062.     //         pos += st->parser->frame_offset;

  1063.     //

  1064.     //         if (pkt.size > b) {

  1065.     //             b = pkt.size;

  1066.     //             key_pos = pos;

  1067.     //         }

  1068.     //

  1069.     //         av_free_packet(&pkt);

  1070.     //     }

  1071. 

  1072.         /* do the seek */

  1073.         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1074.         url_fseek(s->pb, pos, SEEK_SET);

  1075.     }

  1076.     asf_reset_header(s);

  1077.     return 0;

  1078. }

  1079. 

  1080. AVInputFormat asf_demuxer = {

  1081.     "asf",

  1082.     NULL_IF_CONFIG_SMALL("ASF format"),

  1083.     sizeof(ASFContext),

  1084.     asf_probe,

  1085.     asf_read_header,

  1086.     asf_read_packet,

  1087.     asf_read_close,

  1088.     asf_read_seek,

  1089.     asf_read_pts,

  1090.     .metadata_conv = ff_asf_metadata_conv,

  1091. };