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FFmpeg/libavformat/asf.c

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  1. /*

  2.  * ASF compatible demuxer

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

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. #include "avformat.h"

  22. #include "riff.h"

  23. #include "mpegaudio.h"

  24. #include "asf.h"

  25. #include "common.h"

  26. #include "asfcrypt.h"

  27. 

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

  29. 

  30. #undef NDEBUG

  31. #include <assert.h>

  32. 

  33. #define FRAME_HEADER_SIZE 17

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

  35. 

  36. static const GUID index_guid = {

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

  38. };

  39. 

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

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

  42. };

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

  44. /* decoding */

  45. 

  46. //#define DEBUG

  47. 

  48. #ifdef DEBUG

  49. #define PRINT_IF_GUID(g,cmp) \

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

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

  52. 

  53. static void print_guid(const GUID *g)

  54. {

  55.     int i;

  56.     PRINT_IF_GUID(g, asf_header);

  57.     else PRINT_IF_GUID(g, file_header);

  58.     else PRINT_IF_GUID(g, stream_header);

  59.     else PRINT_IF_GUID(g, audio_stream);

  60.     else PRINT_IF_GUID(g, audio_conceal_none);

  61.     else PRINT_IF_GUID(g, video_stream);

  62.     else PRINT_IF_GUID(g, video_conceal_none);

  63.     else PRINT_IF_GUID(g, command_stream);

  64.     else PRINT_IF_GUID(g, comment_header);

  65.     else PRINT_IF_GUID(g, codec_comment_header);

  66.     else PRINT_IF_GUID(g, codec_comment1_header);

  67.     else PRINT_IF_GUID(g, data_header);

  68.     else PRINT_IF_GUID(g, index_guid);

  69.     else PRINT_IF_GUID(g, head1_guid);

  70.     else PRINT_IF_GUID(g, head2_guid);

  71.     else PRINT_IF_GUID(g, my_guid);

  72.     else PRINT_IF_GUID(g, ext_stream_header);

  73.     else PRINT_IF_GUID(g, extended_content_header);

  74.     else PRINT_IF_GUID(g, ext_stream_embed_stream_header);

  75.     else PRINT_IF_GUID(g, ext_stream_audio_stream);

  76.     else PRINT_IF_GUID(g, metadata_header);

  77.     else PRINT_IF_GUID(g, stream_bitrate_guid);

  78.     else

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

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

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

  82.     printf("}\n");

  83. }

  84. #undef PRINT_IF_GUID

  85. #endif

  86. 

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

  88. {

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

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

  91. }

  92. 

  93. #if 0

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

  95. {

  96.     int len, c;

  97.     char *q;

  98. 

  99.     len = get_le16(pb);

  100.     q = buf;

  101.     while (len > 0) {

  102.         c = get_le16(pb);

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

  104.             *q++ = c;

  105.         len--;

  106.     }

  107.     *q = '\0';

  108. }

  109. #endif

  110. 

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

  112. {

  113.     char* q = buf;

  114.     len /= 2;

  115.     while (len--) {

  116.         uint8_t tmp;

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

  118.     }

  119.     *q = '\0';

  120. }

  121. 

  122. static int asf_probe(AVProbeData *pd)

  123. {

  124.     /* check file header */

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

  126.         return AVPROBE_SCORE_MAX;

  127.     else

  128.         return 0;

  129. }

  130. 

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

  132.     switch(type){

  133.         case 2: return get_le32(pb);

  134.         case 3: return get_le32(pb);

  135.         case 4: return get_le64(pb);

  136.         case 5: return get_le16(pb);

  137.         default:return INT_MIN;

  138.     }

  139. }

  140. 

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

  142. {

  143.     ASFContext *asf = s->priv_data;

  144.     GUID g;

  145.     ByteIOContext *pb = s->pb;

  146.     AVStream *st;

  147.     ASFStream *asf_st;

  148.     int size, i;

  149.     int64_t gsize;

  150.     AVRational dar[128];

  151.     uint32_t bitrate[128];

  152. 

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

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

  155. 

  156.     get_guid(pb, &g);

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

  158.         goto fail;

  159.     get_le64(pb);

  160.     get_le32(pb);

  161.     get_byte(pb);

  162.     get_byte(pb);

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

  164.     for(;;) {

  165.         get_guid(pb, &g);

  166.         gsize = get_le64(pb);

  167. #ifdef DEBUG

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

  169.         print_guid(&g);

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

  171. #endif

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

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

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

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

  176.                 asf->data_object_size = gsize - 24;

  177.             } else {

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

  179.             }

  180.             break;

  181.         }

  182.         if (gsize < 24)

  183.             goto fail;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  199.             int type, type_specific_size, sizeX;

  200.             uint64_t total_size;

  201.             unsigned int tag1;

  202.             int64_t pos1, pos2, start_time;

  203.             int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  204. 

  205.             pos1 = url_ftell(pb);

  206. 

  207.             st = av_new_stream(s, 0);

  208.             if (!st)

  209.                 goto fail;

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

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

  212.             if (!asf_st)

  213.                 goto fail;

  214.             st->priv_data = asf_st;

  215.             start_time = asf->hdr.preroll;

  216. 

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

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

  219.                     (10000000 / 1000) - start_time;

  220.             }

  221.             get_guid(pb, &g);

  222. 

  223.             test_for_ext_stream_audio = 0;

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

  225.                 type = CODEC_TYPE_AUDIO;

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

  227.                 type = CODEC_TYPE_VIDEO;

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

  229.                 type = CODEC_TYPE_UNKNOWN;

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

  231.                 test_for_ext_stream_audio = 1;

  232.                 type = CODEC_TYPE_UNKNOWN;

  233.             } else {

  234.                 goto fail;

  235.             }

  236.             get_guid(pb, &g);

  237.             total_size = get_le64(pb);

  238.             type_specific_size = get_le32(pb);

  239.             get_le32(pb);

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

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

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

  243. 

  244.             get_le32(pb);

  245. 

  246.             if (test_for_ext_stream_audio) {

  247.                 get_guid(pb, &g);

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

  249.                     type = CODEC_TYPE_AUDIO;

  250.                     is_dvr_ms_audio=1;

  251.                     get_guid(pb, &g);

  252.                     get_le32(pb);

  253.                     get_le32(pb);

  254.                     get_le32(pb);

  255.                     get_guid(pb, &g);

  256.                     get_le32(pb);

  257.                 }

  258.             }

  259. 

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

  261.             if (type == CODEC_TYPE_AUDIO) {

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

  263.                 if (is_dvr_ms_audio) {

  264.                     // codec_id and codec_tag are unreliable in dvr_ms

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

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

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

  268.                 }

  269.                 st->need_parsing = AVSTREAM_PARSE_FULL;

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

  271.                 pos2 = url_ftell(pb);

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

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

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

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

  276.                     get_le16(pb); //ds_data_size

  277.                     get_byte(pb); //ds_silence_data

  278.                 }

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

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

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

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

  283.                     if (!asf_st->ds_chunk_size

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

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

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

  287.                 }

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

  289.                 case CODEC_ID_MP3:

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

  291.                     break;

  292.                 case CODEC_ID_PCM_S16LE:

  293.                 case CODEC_ID_PCM_S16BE:

  294.                 case CODEC_ID_PCM_U16LE:

  295.                 case CODEC_ID_PCM_U16BE:

  296.                 case CODEC_ID_PCM_S8:

  297.                 case CODEC_ID_PCM_U8:

  298.                 case CODEC_ID_PCM_ALAW:

  299.                 case CODEC_ID_PCM_MULAW:

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

  301.                     break;

  302.                 default:

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

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

  305.                     break;

  306.                 }

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

  308.                 get_le32(pb);

  309.                 get_le32(pb);

  310.                 get_byte(pb);

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

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

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

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

  315.                 /* not available for asf */

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

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

  318.                 tag1 = get_le32(pb);

  319.                 url_fskip(pb, 20);

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

  321.                 size= sizeX;

  322.                 if (size > 40) {

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

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

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

  326.                 }

  327. 

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

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

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

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

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

  333. #ifdef WORDS_BIGENDIAN

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

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

  336. #else

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

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

  339. #endif

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

  341.         }

  342. 

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

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

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

  346.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  347.             }

  348.             pos2 = url_ftell(pb);

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

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

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

  352. 

  353.             len1 = get_le16(pb);

  354.             len2 = get_le16(pb);

  355.             len3 = get_le16(pb);

  356.             len4 = get_le16(pb);

  357.             len5 = get_le16(pb);

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

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

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

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

  362.             url_fskip(pb, len5);

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

  364.             int stream_count = get_le16(pb);

  365.             int j;

  366. 

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

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

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

  370.                 int flags, bitrate, stream_id;

  371. 

  372.                 flags= get_le16(pb);

  373.                 bitrate= get_le32(pb);

  374.                 stream_id= (flags & 0x7f);

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

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

  377.             }

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

  379.                 int desc_count, i;

  380. 

  381.                 desc_count = get_le16(pb);

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

  383.                 {

  384.                         int name_len,value_type,value_len;

  385.                         uint64_t value_num = 0;

  386.                         char name[1024];

  387. 

  388.                         name_len = get_le16(pb);

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

  390.                         value_type = get_le16(pb);

  391.                         value_len = get_le16(pb);

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

  393.                         {

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

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

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

  397.                                     char year[8];

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

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

  400.                                 }

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

  402.                                     char track[8];

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

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

  405.                                 }

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

  407.                                     char track[8];

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

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

  410.                                 }

  411.                                 else url_fskip(pb, value_len);

  412.                         }

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

  414.                         {

  415.                                 value_num= get_value(pb, value_type);

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

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

  418.                         }else

  419.                             url_fskip(pb, value_len);

  420.                 }

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

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

  423.             n = get_le16(pb);

  424. 

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

  426.                 char name[1024];

  427. 

  428.                 get_le16(pb); //lang_list_index

  429.                 stream_num= get_le16(pb);

  430.                 name_len=   get_le16(pb);

  431.                 value_type= get_le16(pb);

  432.                 value_len=  get_le32(pb);

  433. 

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

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

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

  437.                 url_fskip(pb, value_len - 2);

  438. 

  439.                 if(stream_num<128){

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

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

  442.                 }

  443.             }

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

  445.             int ext_len, payload_ext_ct, stream_ct;

  446.             uint32_t ext_d, leak_rate, stream_num;

  447.             int64_t pos_ex_st;

  448.             pos_ex_st = url_ftell(pb);

  449. 

  450.             get_le64(pb); // starttime

  451.             get_le64(pb); // endtime

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

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

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

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

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

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

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

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

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

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

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

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

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

  465. 

  466.             if (stream_num < 128)

  467.                 bitrate[stream_num] = leak_rate;

  468. 

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

  470.                 get_le16(pb);

  471.                 ext_len = get_le16(pb);

  472.                 url_fseek(pb, ext_len, SEEK_CUR);

  473.             }

  474. 

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

  476.                 get_guid(pb, &g);

  477.                 ext_d=get_le16(pb);

  478.                 ext_len=get_le32(pb);

  479.                 url_fseek(pb, ext_len, SEEK_CUR);

  480.             }

  481. 

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

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

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

  485.             int v1, v2;

  486.             get_guid(pb, &g);

  487.             v1 = get_le32(pb);

  488.             v2 = get_le16(pb);

  489. #if 0

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

  491.             int len, v1, n, num;

  492.             char str[256], *q;

  493.             char tag[16];

  494. 

  495.             get_guid(pb, &g);

  496.             print_guid(&g);

  497. 

  498.             n = get_le32(pb);

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

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

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

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

  503.                 len = get_le16(pb);

  504.                 q = tag;

  505.                 while (len > 0) {

  506.                     v1 = get_byte(pb);

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

  508.                         *q++ = v1;

  509.                     len--;

  510.                 }

  511.                 *q = '\0';

  512.             }

  513. #endif

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

  515.             goto fail;

  516.         } else {

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

  518.         }

  519.     }

  520.     get_guid(pb, &g);

  521.     get_le64(pb);

  522.     get_byte(pb);

  523.     get_byte(pb);

  524.     if (url_feof(pb))

  525.         goto fail;

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

  527.     asf->packet_size_left = 0;

  528. 

  529. 

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

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

  532.         if(stream_num>=0){

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

  534.             if (!codec->bit_rate)

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

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

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

  538.                           &codec->sample_aspect_ratio.den,

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

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

  541.         }

  542.     }

  543. 

  544.     return 0;

  545. 

  546.  fail:

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

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

  549.         if (st) {

  550.             av_free(st->priv_data);

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

  552.         }

  553.         av_free(st);

  554.     }

  555.     return -1;

  556. }

  557. 

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

  559.     switch (bits & 3) \

  560.     { \

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

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

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

  564.     default: var = defval; break; \

  565.     }

  566. 

  567. /**

  568.  *

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

  570.  */

  571. static int asf_get_packet(AVFormatContext *s)

  572. {

  573.     ASFContext *asf = s->priv_data;

  574.     ByteIOContext *pb = s->pb;

  575.     uint32_t packet_length, padsize;

  576.     int rsize = 8;

  577.     int c, d, e, off;

  578. 

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

  580. 

  581.     c=d=e=-1;

  582.     while(off-- > 0){

  583.         c=d; d=e;

  584.         e= get_byte(pb);

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

  586.             break;

  587.     }

  588. 

  589.     if (c != 0x82) {

  590.         if (!url_feof(pb))

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

  592.     }

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

  594.         if (d || e) {

  595.             if (!url_feof(pb))

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

  597.             return -1;

  598.         }

  599.         c= get_byte(pb);

  600.         d= get_byte(pb);

  601.         rsize+=3;

  602.     }else{

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

  604.     }

  605. 

  606.     asf->packet_flags    = c;

  607.     asf->packet_property = d;

  608. 

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

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

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

  612. 

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

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

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

  616.         return -1;

  617.     }

  618.     if(padsize >= packet_length){

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

  620.         return -1;

  621.     }

  622. 

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

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

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

  626. 

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

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

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

  630.     } else {

  631.         asf->packet_segments = 1;

  632.         asf->packet_segsizetype = 0x80;

  633.     }

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

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

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

  637.     asf->packet_padsize = padsize;

  638. #ifdef DEBUG

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

  640. #endif

  641.     return 0;

  642. }

  643. 

  644. /**

  645.  *

  646.  * @return <0 if error

  647.  */

  648. static int asf_read_frame_header(AVFormatContext *s){

  649.     ASFContext *asf = s->priv_data;

  650.     ByteIOContext *pb = s->pb;

  651.     int rsize = 1;

  652.     int num = get_byte(pb);

  653.     int64_t ts0, ts1;

  654. 

  655.     asf->packet_segments--;

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

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

  658.     // sequence should be ignored!

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

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

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

  662. //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);

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

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

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

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

  667.             return -1;

  668.         }

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

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

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

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

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

  674.             url_fskip(pb, 10);

  675.             ts0= get_le64(pb);

  676.             ts1= get_le64(pb);

  677.             url_fskip(pb, 12);

  678.             get_le32(pb);

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

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

  681.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  682.         }else

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

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

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

  686.         // multipacket - frag_offset is beginning timestamp

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

  688.         asf->packet_frag_offset = 0;

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

  690. 

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

  692.         rsize++;

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

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

  695.         return -1;

  696.     }

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

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

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

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

  701.             return -1;

  702.         }

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

  704.     } else {

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

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

  707.     }

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

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

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

  711.             return -1;

  712.     }

  713.     asf->packet_size_left -= rsize;

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

  715. 

  716.     return 0;

  717. }

  718. 

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

  720. {

  721.     ASFContext *asf = s->priv_data;

  722.     ASFStream *asf_st = 0;

  723.     ByteIOContext *pb = s->pb;

  724.     //static int pc = 0;

  725.     for (;;) {

  726.         if(url_feof(pb))

  727.             return AVERROR(EIO);

  728.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  733.             assert(ret>=0);

  734.             /* fail safe */

  735.             url_fskip(pb, ret);

  736. 

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

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

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

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

  741.             ret = asf_get_packet(s);

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

  743.             if (ret < 0)

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

  745.             asf->packet_time_start = 0;

  746.             continue;

  747.         }

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

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

  750.                 asf->packet_segments= 0;

  751.                 continue;

  752.             }

  753.             if (asf->stream_index < 0

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

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

  756.                 ) {

  757.                 asf->packet_time_start = 0;

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

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

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

  761.                 if(asf->stream_index < 0)

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

  763.                 continue;

  764.             }

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

  766.         }

  767.         asf_st = asf->asf_st;

  768. 

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

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

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

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

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

  774.             asf->packet_size_left--;

  775.             asf->packet_multi_size--;

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

  777.             {

  778.                 asf->packet_time_start = 0;

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

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

  781.                 continue;

  782.             }

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

  784.             //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);

  785.         }

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

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

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

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

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

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

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

  793.         }

  794. 

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

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

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

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

  799.                 asf_st->frag_offset = 0;

  800.                 av_free_packet(&asf_st->pkt);

  801.             }

  802.             /* new packet */

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

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

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

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

  807.             asf_st->pkt.pos =

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

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

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

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

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

  813.                 asf->packet_key_frame = 1;

  814.             if (asf->packet_key_frame)

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

  816.         }

  817. 

  818.         /* read data */

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

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

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

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

  823.         if (asf->packet_size_left < 0)

  824.             continue;

  825. 

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

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

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

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

  830.             continue;

  831.         }

  832. 

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

  834.                    asf->packet_frag_size);

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

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

  837.                             asf->packet_frag_size);

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

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

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

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

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

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

  844.                 int i;

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

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

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

  848.                     asf_st->frag_offset = 0;

  849.                     av_free_packet(&asf_st->pkt);

  850.                     continue;

  851.                 }

  852.             }

  853. 

  854.             /* return packet */

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

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

  857.                     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);

  858.               }else{

  859.                 /* packet descrambling */

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

  861.                 if (newdata) {

  862.                     int offset = 0;

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

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

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

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

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

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

  869. 

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

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

  872.                         memcpy(newdata + offset,

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

  874.                                asf_st->ds_chunk_size);

  875.                         offset += asf_st->ds_chunk_size;

  876.                     }

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

  878.                     asf_st->pkt.data = newdata;

  879.                 }

  880.               }

  881.             }

  882.             asf_st->frag_offset = 0;

  883.             *pkt= asf_st->pkt;

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

  885.             asf_st->pkt.size = 0;

  886.             asf_st->pkt.data = 0;

  887.             break; // packet completed

  888.         }

  889.     }

  890.     return 0;

  891. }

  892. 

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

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

  895. // leftover information from previous reads

  896. static void asf_reset_header(AVFormatContext *s)

  897. {

  898.     ASFContext *asf = s->priv_data;

  899.     ASFStream *asf_st;

  900.     int i;

  901. 

  902.     asf->packet_nb_frames = 0;

  903.     asf->packet_size_left = 0;

  904.     asf->packet_segments = 0;

  905.     asf->packet_flags = 0;

  906.     asf->packet_property = 0;

  907.     asf->packet_timestamp = 0;

  908.     asf->packet_segsizetype = 0;

  909.     asf->packet_segments = 0;

  910.     asf->packet_seq = 0;

  911.     asf->packet_replic_size = 0;

  912.     asf->packet_key_frame = 0;

  913.     asf->packet_padsize = 0;

  914.     asf->packet_frag_offset = 0;

  915.     asf->packet_frag_size = 0;

  916.     asf->packet_frag_timestamp = 0;

  917.     asf->packet_multi_size = 0;

  918.     asf->packet_obj_size = 0;

  919.     asf->packet_time_delta = 0;

  920.     asf->packet_time_start = 0;

  921. 

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

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

  924.         av_free_packet(&asf_st->pkt);

  925.         asf_st->frag_offset=0;

  926.         asf_st->seq=0;

  927.     }

  928.     asf->asf_st= NULL;

  929. }

  930. 

  931. static int asf_read_close(AVFormatContext *s)

  932. {

  933.     int i;

  934. 

  935.     asf_reset_header(s);

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

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

  938.         av_free(st->priv_data);

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

  940.     }

  941.     return 0;

  942. }

  943. 

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

  945. {

  946.     ASFContext *asf = s->priv_data;

  947.     AVPacket pkt1, *pkt = &pkt1;

  948.     ASFStream *asf_st;

  949.     int64_t pts;

  950.     int64_t pos= *ppos;

  951.     int i;

  952.     int64_t start_pos[s->nb_streams];

  953. 

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

  955.         start_pos[i]= pos;

  956.     }

  957. 

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

  959.     *ppos= pos;

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

  961. 

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

  963.     asf_reset_header(s);

  964.     for(;;){

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

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

  967.             return AV_NOPTS_VALUE;

  968.         }

  969. 

  970.         pts= pkt->pts;

  971. 

  972.         av_free_packet(pkt);

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

  974.             i= pkt->stream_index;

  975. 

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

  977. 

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

  979.             pos= asf_st->packet_pos;

  980. 

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

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

  983. 

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

  985.                break;

  986.         }

  987.     }

  988. 

  989.     *ppos= pos;

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

  991. 

  992.     return pts;

  993. }

  994. 

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

  996. {

  997.     GUID g;

  998.     ASFContext *asf = s->priv_data;

  999.     int64_t gsize, itime;

  1000.     int64_t pos, current_pos, index_pts;

  1001.     int i;

  1002.     int pct,ict;

  1003. 

  1004.     current_pos = url_ftell(s->pb);

  1005. 

  1006.     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);

  1007.     get_guid(s->pb, &g);

  1008.     if (!memcmp(&g, &index_guid, sizeof(GUID))) {

  1009.         gsize = get_le64(s->pb);

  1010.         get_guid(s->pb, &g);

  1011.         itime=get_le64(s->pb);

  1012.         pct=get_le32(s->pb);

  1013.         ict=get_le32(s->pb);

  1014.         av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1015. 

  1016.         for (i=0;i<ict;i++){

  1017.             int pktnum=get_le32(s->pb);

  1018.             int pktct =get_le16(s->pb);

  1019.             av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);

  1020. 

  1021.             pos=s->data_offset + asf->packet_size*(int64_t)pktnum;

  1022.             index_pts=av_rescale(itime, i, 10000);

  1023. 

  1024.             av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);

  1025.         }

  1026.         asf->index_read= 1;

  1027.     }

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

  1029. }

  1030. 

  1031. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1032. {

  1033.     ASFContext *asf = s->priv_data;

  1034.     AVStream *st = s->streams[stream_index];

  1035.     int64_t pos;

  1036.     int index;

  1037. 

  1038.     if (asf->packet_size <= 0)

  1039.         return -1;

  1040. 

  1041.     /* Try using the protocol's read_seek if available */

  1042.     if(s->pb) {

  1043.         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);

  1044.         if(ret >= 0)

  1045.             asf_reset_header(s);

  1046.         if (ret != AVERROR(ENOSYS))

  1047.             return ret;

  1048.     }

  1049. 

  1050.     if (!asf->index_read)

  1051.         asf_build_simple_index(s, stream_index);

  1052. 

  1053.     if(!(asf->index_read && st->index_entries)){

  1054.         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)

  1055.             return -1;

  1056.     }else{

  1057.         index= av_index_search_timestamp(st, pts, flags);

  1058.         if(index<0)

  1059.             return -1;

  1060. 

  1061.         /* find the position */

  1062.         pos = st->index_entries[index].pos;

  1063.         pts = st->index_entries[index].timestamp;

  1064. 

  1065.     // various attempts to find key frame have failed so far

  1066.     //    asf_reset_header(s);

  1067.     //    url_fseek(s->pb, pos, SEEK_SET);

  1068.     //    key_pos = pos;

  1069.     //     for(i=0;i<16;i++){

  1070.     //         pos = url_ftell(s->pb);

  1071.     //         if (av_read_frame(s, &pkt) < 0){

  1072.     //             av_log(s, AV_LOG_INFO, "seek failed\n");

  1073.     //             return -1;

  1074.     //         }

  1075.     //         asf_st = s->streams[stream_index]->priv_data;

  1076.     //         pos += st->parser->frame_offset;

  1077.     //

  1078.     //         if (pkt.size > b) {

  1079.     //             b = pkt.size;

  1080.     //             key_pos = pos;

  1081.     //         }

  1082.     //

  1083.     //         av_free_packet(&pkt);

  1084.     //     }

  1085. 

  1086.         /* do the seek */

  1087.         av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1088.         url_fseek(s->pb, pos, SEEK_SET);

  1089.     }

  1090.     asf_reset_header(s);

  1091.     return 0;

  1092. }

  1093. 

  1094. AVInputFormat asf_demuxer = {

  1095.     "asf",

  1096.     "asf format",

  1097.     sizeof(ASFContext),

  1098.     asf_probe,

  1099.     asf_read_header,

  1100.     asf_read_packet,

  1101.     asf_read_close,

  1102.     asf_read_seek,

  1103.     asf_read_pts,

  1104. };