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FFmpeg/libavformat/asfdec.c

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  1. /*

  2.  * ASF compatible demuxer

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

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. //#define DEBUG

  23. 

  24. #include "libavutil/common.h"

  25. #include "libavutil/avstring.h"

  26. #include "libavcodec/mpegaudio.h"

  27. #include "avformat.h"

  28. #include "riff.h"

  29. #include "asf.h"

  30. #include "asfcrypt.h"

  31. #include "avlanguage.h"

  32. 

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

  34. 

  35. #undef NDEBUG

  36. #include <assert.h>

  37. 

  38. #define FRAME_HEADER_SIZE 17

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

  40. 

  41. static const ff_asf_guid index_guid = {

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

  43. };

  44. 

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

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

  47. };

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

  49. /* decoding */

  50. 

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

  52. {

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

  54. }

  55. 

  56. #ifdef DEBUG

  57. #define PRINT_IF_GUID(g,cmp) \

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

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

  60. 

  61. static void print_guid(const ff_asf_guid *g)

  62. {

  63.     int i;

  64.     PRINT_IF_GUID(g, ff_asf_header);

  65.     else PRINT_IF_GUID(g, ff_asf_file_header);

  66.     else PRINT_IF_GUID(g, ff_asf_stream_header);

  67.     else PRINT_IF_GUID(g, ff_asf_audio_stream);

  68.     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);

  69.     else PRINT_IF_GUID(g, ff_asf_video_stream);

  70.     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);

  71.     else PRINT_IF_GUID(g, ff_asf_command_stream);

  72.     else PRINT_IF_GUID(g, ff_asf_comment_header);

  73.     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);

  74.     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);

  75.     else PRINT_IF_GUID(g, ff_asf_data_header);

  76.     else PRINT_IF_GUID(g, index_guid);

  77.     else PRINT_IF_GUID(g, ff_asf_head1_guid);

  78.     else PRINT_IF_GUID(g, ff_asf_head2_guid);

  79.     else PRINT_IF_GUID(g, ff_asf_my_guid);

  80.     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);

  81.     else PRINT_IF_GUID(g, ff_asf_extended_content_header);

  82.     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);

  83.     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);

  84.     else PRINT_IF_GUID(g, ff_asf_metadata_header);

  85.     else PRINT_IF_GUID(g, stream_bitrate_guid);

  86.     else PRINT_IF_GUID(g, ff_asf_language_guid);

  87.     else

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

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

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

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

  92. }

  93. #undef PRINT_IF_GUID

  94. #else

  95. #define print_guid(g)

  96. #endif

  97. 

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

  99. {

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

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

  102. }

  103. 

  104. #if 0

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

  106. {

  107.     int len, c;

  108.     char *q;

  109. 

  110.     len = get_le16(pb);

  111.     q = buf;

  112.     while (len > 0) {

  113.         c = get_le16(pb);

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

  115.             *q++ = c;

  116.         len--;

  117.     }

  118.     *q = '\0';

  119. }

  120. #endif

  121. 

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

  123. {

  124.     char* q = buf;

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

  126.         uint8_t tmp;

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

  128.     }

  129.     if (len > 0)

  130.         url_fskip(pb, len);

  131.     *q = '\0';

  132. }

  133. 

  134. static int asf_probe(AVProbeData *pd)

  135. {

  136.     /* check file header */

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

  138.         return AVPROBE_SCORE_MAX;

  139.     else

  140.         return 0;

  141. }

  142. 

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

  144.     switch(type){

  145.         case 2: return get_le32(pb);

  146.         case 3: return get_le32(pb);

  147.         case 4: return get_le64(pb);

  148.         case 5: return get_le16(pb);

  149.         default:return INT_MIN;

  150.     }

  151. }

  152. 

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

  154. {

  155.     char value[1024];

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

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

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

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

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

  161.     } else {

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

  163.         return;

  164.     }

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

  166.         key += 3;

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

  168. }

  169. 

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

  171. {

  172.     ASFContext *asf = s->priv_data;

  173.     ff_asf_guid g;

  174.     ByteIOContext *pb = s->pb;

  175.     AVStream *st;

  176.     ASFStream *asf_st;

  177.     int size, i;

  178.     int64_t gsize;

  179.     AVRational dar[128];

  180.     uint32_t bitrate[128];

  181. 

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

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

  184. 

  185.     get_guid(pb, &g);

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

  187.         return -1;

  188.     get_le64(pb);

  189.     get_le32(pb);

  190.     get_byte(pb);

  191.     get_byte(pb);

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

  193.     for(;;) {

  194.         get_guid(pb, &g);

  195.         gsize = get_le64(pb);

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

  197.         print_guid(&g);

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

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

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

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

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

  203.                 asf->data_object_size = gsize - 24;

  204.             } else {

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

  206.             }

  207.             break;

  208.         }

  209.         if (gsize < 24)

  210.             return -1;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  226.             enum CodecType type;

  227.             int type_specific_size, sizeX;

  228.             uint64_t total_size;

  229.             unsigned int tag1;

  230.             int64_t pos1, pos2, start_time;

  231.             int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  232. 

  233.             pos1 = url_ftell(pb);

  234. 

  235.             st = av_new_stream(s, 0);

  236.             if (!st)

  237.                 return AVERROR(ENOMEM);

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

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

  240.             if (!asf_st)

  241.                 return AVERROR(ENOMEM);

  242.             st->priv_data = asf_st;

  243.             start_time = asf->hdr.preroll;

  244. 

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

  246. 

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

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

  249.                     (10000000 / 1000) - start_time;

  250.             }

  251.             get_guid(pb, &g);

  252. 

  253.             test_for_ext_stream_audio = 0;

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

  255.                 type = CODEC_TYPE_AUDIO;

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

  257.                 type = CODEC_TYPE_VIDEO;

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

  259.                 type = CODEC_TYPE_DATA;

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

  261.                 test_for_ext_stream_audio = 1;

  262.                 type = CODEC_TYPE_UNKNOWN;

  263.             } else {

  264.                 return -1;

  265.             }

  266.             get_guid(pb, &g);

  267.             total_size = get_le64(pb);

  268.             type_specific_size = get_le32(pb);

  269.             get_le32(pb);

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

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

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

  273. 

  274.             get_le32(pb);

  275. 

  276.             if (test_for_ext_stream_audio) {

  277.                 get_guid(pb, &g);

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

  279.                     type = CODEC_TYPE_AUDIO;

  280.                     is_dvr_ms_audio=1;

  281.                     get_guid(pb, &g);

  282.                     get_le32(pb);

  283.                     get_le32(pb);

  284.                     get_le32(pb);

  285.                     get_guid(pb, &g);

  286.                     get_le32(pb);

  287.                 }

  288.             }

  289. 

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

  291.             if (type == CODEC_TYPE_AUDIO) {

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

  293.                 if (is_dvr_ms_audio) {

  294.                     // codec_id and codec_tag are unreliable in dvr_ms

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

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

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

  298.                 }

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

  300.                     st->need_parsing = AVSTREAM_PARSE_NONE;

  301.                 } else {

  302.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  303.                 }

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

  305.                 pos2 = url_ftell(pb);

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

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

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

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

  310.                     get_le16(pb); //ds_data_size

  311.                     get_byte(pb); //ds_silence_data

  312.                 }

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

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

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

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

  317.                     if (!asf_st->ds_chunk_size

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

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

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

  321.                 }

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

  323.                 case CODEC_ID_MP3:

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

  325.                     break;

  326.                 case CODEC_ID_PCM_S16LE:

  327.                 case CODEC_ID_PCM_S16BE:

  328.                 case CODEC_ID_PCM_U16LE:

  329.                 case CODEC_ID_PCM_U16BE:

  330.                 case CODEC_ID_PCM_S8:

  331.                 case CODEC_ID_PCM_U8:

  332.                 case CODEC_ID_PCM_ALAW:

  333.                 case CODEC_ID_PCM_MULAW:

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

  335.                     break;

  336.                 default:

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

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

  339.                     break;

  340.                 }

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

  342.                 get_le32(pb);

  343.                 get_le32(pb);

  344.                 get_byte(pb);

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

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

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

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

  349.                 /* not available for asf */

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

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

  352.                 tag1 = get_le32(pb);

  353.                 url_fskip(pb, 20);

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

  355.                 size= sizeX;

  356.                 if (size > 40) {

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

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

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

  360.                 }

  361. 

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

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

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

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

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

  367. #ifdef WORDS_BIGENDIAN

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

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

  370. #else

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

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

  373. #endif

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

  375.                 }

  376. 

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

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

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

  380.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  381.             }

  382.             pos2 = url_ftell(pb);

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

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

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

  386. 

  387.             len1 = get_le16(pb);

  388.             len2 = get_le16(pb);

  389.             len3 = get_le16(pb);

  390.             len4 = get_le16(pb);

  391.             len5 = get_le16(pb);

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

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

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

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

  396.             url_fskip(pb, len5);

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

  398.             int stream_count = get_le16(pb);

  399.             int j;

  400. 

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

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

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

  404.                 int flags, bitrate, stream_id;

  405. 

  406.                 flags= get_le16(pb);

  407.                 bitrate= get_le32(pb);

  408.                 stream_id= (flags & 0x7f);

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

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

  411.             }

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

  413.             int j;

  414.             int stream_count = get_le16(pb);

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

  416.                 char lang[6];

  417.                 unsigned int lang_len = get_byte(pb);

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

  419.                 if (j < 128)

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

  421.             }

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

  423.             int desc_count, i;

  424. 

  425.             desc_count = get_le16(pb);

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

  427.                     int name_len,value_type,value_len;

  428.                     char name[1024];

  429. 

  430.                     name_len = get_le16(pb);

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

  432.                     value_type = get_le16(pb);

  433.                     value_len  = get_le16(pb);

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

  435.             }

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

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

  438.             n = get_le16(pb);

  439. 

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

  441.                 char name[1024];

  442. 

  443.                 get_le16(pb); //lang_list_index

  444.                 stream_num= get_le16(pb);

  445.                 name_len=   get_le16(pb);

  446.                 value_type= get_le16(pb);

  447.                 value_len=  get_le32(pb);

  448. 

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

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

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

  452.                 url_fskip(pb, value_len - 2);

  453. 

  454.                 if(stream_num<128){

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

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

  457.                 }

  458.             }

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

  460.             int ext_len, payload_ext_ct, stream_ct;

  461.             uint32_t ext_d, leak_rate, stream_num;

  462.             unsigned int stream_languageid_index;

  463. 

  464.             get_le64(pb); // starttime

  465.             get_le64(pb); // endtime

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

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

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

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

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

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

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

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

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

  475. 

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

  477.             if (stream_num < 128)

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

  479. 

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

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

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

  483. 

  484.             if (stream_num < 128)

  485.                 bitrate[stream_num] = leak_rate;

  486. 

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

  488.                 get_le16(pb);

  489.                 ext_len = get_le16(pb);

  490.                 url_fseek(pb, ext_len, SEEK_CUR);

  491.             }

  492. 

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

  494.                 get_guid(pb, &g);

  495.                 ext_d=get_le16(pb);

  496.                 ext_len=get_le32(pb);

  497.                 url_fseek(pb, ext_len, SEEK_CUR);

  498.             }

  499. 

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

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

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

  503.             int v1, v2;

  504.             get_guid(pb, &g);

  505.             v1 = get_le32(pb);

  506.             v2 = get_le16(pb);

  507. #if 0

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

  509.             int len, v1, n, num;

  510.             char str[256], *q;

  511.             char tag[16];

  512. 

  513.             get_guid(pb, &g);

  514.             print_guid(&g);

  515. 

  516.             n = get_le32(pb);

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

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

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

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

  521.                 len = get_le16(pb);

  522.                 q = tag;

  523.                 while (len > 0) {

  524.                     v1 = get_byte(pb);

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

  526.                         *q++ = v1;

  527.                     len--;

  528.                 }

  529.                 *q = '\0';

  530.             }

  531. #endif

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

  533.             return -1;

  534.         } else {

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

  536.         }

  537.     }

  538.     get_guid(pb, &g);

  539.     get_le64(pb);

  540.     get_byte(pb);

  541.     get_byte(pb);

  542.     if (url_feof(pb))

  543.         return -1;

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

  545.     asf->packet_size_left = 0;

  546. 

  547. 

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

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

  550.         if(stream_num>=0){

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

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

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

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

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

  556.                           &st->sample_aspect_ratio.den,

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

  558. //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);

  559. 

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

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

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

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

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

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

  566.                     if (iso6392)

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

  568.                 }

  569.             }

  570.         }

  571.     }

  572. 

  573.     return 0;

  574. }

  575. 

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

  577.     switch (bits & 3) \

  578.     { \

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

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

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

  582.     default: var = defval; break; \

  583.     }

  584. 

  585. /**

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

  587.  * @param s demux context

  588.  * @param pb context to read data from

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

  590.  */

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

  592. {

  593.     ASFContext *asf = s->priv_data;

  594.     uint32_t packet_length, padsize;

  595.     int rsize = 8;

  596.     int c, d, e, off;

  597. 

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

  599. 

  600.     c=d=e=-1;

  601.     while(off-- > 0){

  602.         c=d; d=e;

  603.         e= get_byte(pb);

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

  605.             break;

  606.     }

  607. 

  608.     if (c != 0x82) {

  609.         if (!url_feof(pb))

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

  611.     }

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

  613.         if (d || e) {

  614.             if (!url_feof(pb))

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

  616.             return -1;

  617.         }

  618.         c= get_byte(pb);

  619.         d= get_byte(pb);

  620.         rsize+=3;

  621.     }else{

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

  623.     }

  624. 

  625.     asf->packet_flags    = c;

  626.     asf->packet_property = d;

  627. 

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

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

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

  631. 

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

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

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

  635.         return -1;

  636.     }

  637.     if(padsize >= packet_length){

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

  639.         return -1;

  640.     }

  641. 

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

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

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

  645. 

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

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

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

  649.     } else {

  650.         asf->packet_segments = 1;

  651.         asf->packet_segsizetype = 0x80;

  652.     }

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

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

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

  656.     asf->packet_padsize = padsize;

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

  658.     return 0;

  659. }

  660. 

  661. /**

  662.  *

  663.  * @return <0 if error

  664.  */

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

  666.     ASFContext *asf = s->priv_data;

  667.     int rsize = 1;

  668.     int num = get_byte(pb);

  669.     int64_t ts0, ts1;

  670. 

  671.     asf->packet_segments--;

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

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

  674.     // sequence should be ignored!

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

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

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

  678. //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);

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

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

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

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

  683.             return -1;

  684.         }

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

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

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

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

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

  690.             url_fskip(pb, 10);

  691.             ts0= get_le64(pb);

  692.             ts1= get_le64(pb);

  693.             url_fskip(pb, 12);

  694.             get_le32(pb);

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

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

  697.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  698.         }else

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

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

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

  702.         // multipacket - frag_offset is beginning timestamp

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

  704.         asf->packet_frag_offset = 0;

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

  706. 

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

  708.         rsize++;

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

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

  711.         return -1;

  712.     }

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

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

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

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

  717.             return -1;

  718.         }

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

  720.     } else {

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

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

  723.     }

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

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

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

  727.             return -1;

  728.     }

  729.     asf->packet_size_left -= rsize;

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

  731. 

  732.     return 0;

  733. }

  734. 

  735. /**

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

  737.  * with asf_get_packet()).

  738.  * @param s demux context

  739.  * @param pb context to read data from

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

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

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

  743.  */

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

  745. {

  746.     ASFContext *asf = s->priv_data;

  747.     ASFStream *asf_st = 0;

  748.     for (;;) {

  749.         if(url_feof(pb))

  750.             return AVERROR_EOF;

  751.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  756.             assert(ret>=0);

  757.             /* fail safe */

  758.             url_fskip(pb, ret);

  759. 

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

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

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

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

  764.             return 1;

  765.         }

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

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

  768.                 asf->packet_segments= 0;

  769.                 continue;

  770.             }

  771.             if (asf->stream_index < 0

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

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

  774.                 ) {

  775.                 asf->packet_time_start = 0;

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

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

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

  779.                 if(asf->stream_index < 0)

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

  781.                 continue;

  782.             }

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

  784.         }

  785.         asf_st = asf->asf_st;

  786. 

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

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

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

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

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

  792.             asf->packet_size_left--;

  793.             asf->packet_multi_size--;

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

  795.             {

  796.                 asf->packet_time_start = 0;

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

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

  799.                 continue;

  800.             }

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

  802.             //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);

  803.         }

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

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

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

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

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

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

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

  811.         }

  812. 

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

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

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

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

  817.                 asf_st->frag_offset = 0;

  818.                 av_free_packet(&asf_st->pkt);

  819.             }

  820.             /* new packet */

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

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

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

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

  825.             asf_st->pkt.pos =

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

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

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

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

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

  831.                 asf->packet_key_frame = 1;

  832.             if (asf->packet_key_frame)

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

  834.         }

  835. 

  836.         /* read data */

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

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

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

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

  841.         if (asf->packet_size_left < 0)

  842.             continue;

  843. 

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

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

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

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

  848.             continue;

  849.         }

  850. 

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

  852.                    asf->packet_frag_size);

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

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

  855.                             asf->packet_frag_size);

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

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

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

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

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

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

  862.                 int i;

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

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

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

  866.                     asf_st->frag_offset = 0;

  867.                     av_free_packet(&asf_st->pkt);

  868.                     continue;

  869.                 }

  870.             }

  871. 

  872.             /* return packet */

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

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

  875.                     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);

  876.               }else{

  877.                 /* packet descrambling */

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

  879.                 if (newdata) {

  880.                     int offset = 0;

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

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

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

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

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

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

  887. 

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

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

  890.                         memcpy(newdata + offset,

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

  892.                                asf_st->ds_chunk_size);

  893.                         offset += asf_st->ds_chunk_size;

  894.                     }

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

  896.                     asf_st->pkt.data = newdata;

  897.                 }

  898.               }

  899.             }

  900.             asf_st->frag_offset = 0;

  901.             *pkt= asf_st->pkt;

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

  903.             asf_st->pkt.size = 0;

  904.             asf_st->pkt.data = 0;

  905.             break; // packet completed

  906.         }

  907.     }

  908.     return 0;

  909. }

  910. 

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

  912. {

  913.     ASFContext *asf = s->priv_data;

  914. 

  915.     for (;;) {

  916.         int ret;

  917. 

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

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

  920.             return ret;

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

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

  923.         asf->packet_time_start = 0;

  924.     }

  925. 

  926.     return 0;

  927. }

  928. 

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

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

  931. // leftover information from previous reads

  932. static void asf_reset_header(AVFormatContext *s)

  933. {

  934.     ASFContext *asf = s->priv_data;

  935.     ASFStream *asf_st;

  936.     int i;

  937. 

  938.     asf->packet_nb_frames = 0;

  939.     asf->packet_size_left = 0;

  940.     asf->packet_segments = 0;

  941.     asf->packet_flags = 0;

  942.     asf->packet_property = 0;

  943.     asf->packet_timestamp = 0;

  944.     asf->packet_segsizetype = 0;

  945.     asf->packet_segments = 0;

  946.     asf->packet_seq = 0;

  947.     asf->packet_replic_size = 0;

  948.     asf->packet_key_frame = 0;

  949.     asf->packet_padsize = 0;

  950.     asf->packet_frag_offset = 0;

  951.     asf->packet_frag_size = 0;

  952.     asf->packet_frag_timestamp = 0;

  953.     asf->packet_multi_size = 0;

  954.     asf->packet_obj_size = 0;

  955.     asf->packet_time_delta = 0;

  956.     asf->packet_time_start = 0;

  957. 

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

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

  960.         av_free_packet(&asf_st->pkt);

  961.         asf_st->frag_offset=0;

  962.         asf_st->seq=0;

  963.     }

  964.     asf->asf_st= NULL;

  965. }

  966. 

  967. static int asf_read_close(AVFormatContext *s)

  968. {

  969.     int i;

  970. 

  971.     asf_reset_header(s);

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

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

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

  975.     }

  976.     return 0;

  977. }

  978. 

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

  980. {

  981.     ASFContext *asf = s->priv_data;

  982.     AVPacket pkt1, *pkt = &pkt1;

  983.     ASFStream *asf_st;

  984.     int64_t pts;

  985.     int64_t pos= *ppos;

  986.     int i;

  987.     int64_t start_pos[s->nb_streams];

  988. 

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

  990.         start_pos[i]= pos;

  991.     }

  992. 

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

  994.     *ppos= pos;

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

  996. 

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

  998.     asf_reset_header(s);

  999.     for(;;){

  1000.         if (av_read_frame(s, pkt) < 0){

  1001.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1002.             return AV_NOPTS_VALUE;

  1003.         }

  1004. 

  1005.         pts= pkt->pts;

  1006. 

  1007.         av_free_packet(pkt);

  1008.         if(pkt->flags&PKT_FLAG_KEY){

  1009.             i= pkt->stream_index;

  1010. 

  1011.             asf_st= s->streams[i]->priv_data;

  1012. 

  1013. //            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);

  1014.             pos= asf_st->packet_pos;

  1015. 

  1016.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1017.             start_pos[i]= asf_st->packet_pos + 1;

  1018. 

  1019.             if(pkt->stream_index == stream_index)

  1020.                break;

  1021.         }

  1022.     }

  1023. 

  1024.     *ppos= pos;

  1025. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1026. 

  1027.     return pts;

  1028. }

  1029. 

  1030. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1031. {

  1032.     ff_asf_guid g;

  1033.     ASFContext *asf = s->priv_data;

  1034.     int64_t current_pos= url_ftell(s->pb);

  1035.     int i;

  1036. 

  1037.     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);

  1038.     get_guid(s->pb, &g);

  1039.     if (!guidcmp(&g, &index_guid)) {

  1040.         int64_t itime;

  1041.         int pct, ict;

  1042.         int64_t av_unused gsize= get_le64(s->pb);

  1043.         get_guid(s->pb, &g);

  1044.         itime=get_le64(s->pb);

  1045.         pct=get_le32(s->pb);

  1046.         ict=get_le32(s->pb);

  1047.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1048. 

  1049.         for (i=0;i<ict;i++){

  1050.             int pktnum=get_le32(s->pb);

  1051.             int pktct =get_le16(s->pb);

  1052.             int64_t pos      = s->data_offset + asf->packet_size*(int64_t)pktnum;

  1053.             int64_t index_pts= av_rescale(itime, i, 10000);

  1054. 

  1055.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);

  1056.             av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);

  1057.         }

  1058.         asf->index_read= 1;

  1059.     }

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

  1061. }

  1062. 

  1063. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1064. {

  1065.     ASFContext *asf = s->priv_data;

  1066.     AVStream *st = s->streams[stream_index];

  1067.     int64_t pos;

  1068.     int index;

  1069. 

  1070.     if (asf->packet_size <= 0)

  1071.         return -1;

  1072. 

  1073.     /* Try using the protocol's read_seek if available */

  1074.     if(s->pb) {

  1075.         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);

  1076.         if(ret >= 0)

  1077.             asf_reset_header(s);

  1078.         if (ret != AVERROR(ENOSYS))

  1079.             return ret;

  1080.     }

  1081. 

  1082.     if (!asf->index_read)

  1083.         asf_build_simple_index(s, stream_index);

  1084. 

  1085.     if(!(asf->index_read && st->index_entries)){

  1086.         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)

  1087.             return -1;

  1088.     }else{

  1089.         index= av_index_search_timestamp(st, pts, flags);

  1090.         if(index<0)

  1091.             return -1;

  1092. 

  1093.         /* find the position */

  1094.         pos = st->index_entries[index].pos;

  1095. 

  1096.     // various attempts to find key frame have failed so far

  1097.     //    asf_reset_header(s);

  1098.     //    url_fseek(s->pb, pos, SEEK_SET);

  1099.     //    key_pos = pos;

  1100.     //     for(i=0;i<16;i++){

  1101.     //         pos = url_ftell(s->pb);

  1102.     //         if (av_read_frame(s, &pkt) < 0){

  1103.     //             av_log(s, AV_LOG_INFO, "seek failed\n");

  1104.     //             return -1;

  1105.     //         }

  1106.     //         asf_st = s->streams[stream_index]->priv_data;

  1107.     //         pos += st->parser->frame_offset;

  1108.     //

  1109.     //         if (pkt.size > b) {

  1110.     //             b = pkt.size;

  1111.     //             key_pos = pos;

  1112.     //         }

  1113.     //

  1114.     //         av_free_packet(&pkt);

  1115.     //     }

  1116. 

  1117.         /* do the seek */

  1118.         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1119.         url_fseek(s->pb, pos, SEEK_SET);

  1120.     }

  1121.     asf_reset_header(s);

  1122.     return 0;

  1123. }

  1124. 

  1125. AVInputFormat asf_demuxer = {

  1126.     "asf",

  1127.     NULL_IF_CONFIG_SMALL("ASF format"),

  1128.     sizeof(ASFContext),

  1129.     asf_probe,

  1130.     asf_read_header,

  1131.     asf_read_packet,

  1132.     asf_read_close,

  1133.     asf_read_seek,

  1134.     asf_read_pts,

  1135.     .metadata_conv = ff_asf_metadata_conv,

  1136. };