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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, ff_asf_marker_header);

  86.     else PRINT_IF_GUID(g, stream_bitrate_guid);

  87.     else PRINT_IF_GUID(g, ff_asf_language_guid);

  88.     else

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

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

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

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

  93. }

  94. #undef PRINT_IF_GUID

  95. #else

  96. #define print_guid(g)

  97. #endif

  98. 

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

  100. {

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

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

  103. }

  104. 

  105. #if 0

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

  107. {

  108.     int len, c;

  109.     char *q;

  110. 

  111.     len = get_le16(pb);

  112.     q = buf;

  113.     while (len > 0) {

  114.         c = get_le16(pb);

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

  116.             *q++ = c;

  117.         len--;

  118.     }

  119.     *q = '\0';

  120. }

  121. #endif

  122. 

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

  124. {

  125.     char* q = buf;

  126.     while (len > 1) {

  127.         uint8_t tmp;

  128.         uint32_t ch;

  129. 

  130.         GET_UTF16(ch, (len -= 2) >= 0 ? get_le16(pb) : 0, break;)

  131.         PUT_UTF8(ch, tmp, if (q - buf < buf_size - 1) *q++ = tmp;)

  132.     }

  133.     if (len > 0)

  134.         url_fskip(pb, len);

  135.     *q = '\0';

  136. }

  137. 

  138. static int asf_probe(AVProbeData *pd)

  139. {

  140.     /* check file header */

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

  142.         return AVPROBE_SCORE_MAX;

  143.     else

  144.         return 0;

  145. }

  146. 

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

  148.     switch(type){

  149.         case 2: return get_le32(pb);

  150.         case 3: return get_le32(pb);

  151.         case 4: return get_le64(pb);

  152.         case 5: return get_le16(pb);

  153.         default:return INT_MIN;

  154.     }

  155. }

  156. 

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

  158. {

  159.     char *value;

  160. 

  161.     if ((unsigned)len >= (UINT_MAX - 1)/2)

  162.         return;

  163. 

  164.     value = av_malloc(2*len+1);

  165.     if (!value)

  166.         return;

  167. 

  168.     if (type == 0) {         // UTF16-LE

  169.         get_str16_nolen(s->pb, len, value, 2*len + 1);

  170.     } else if (type > 1 && type <= 5) {  // boolean or DWORD or QWORD or WORD

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

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

  173.     } else {

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

  175.         av_freep(&value);

  176.         av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);

  177.         return;

  178.     }

  179.     av_metadata_set2(&s->metadata, key, value, 0);

  180.     av_freep(&value);

  181. }

  182. 

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

  184. {

  185.     ASFContext *asf = s->priv_data;

  186.     ff_asf_guid g;

  187.     ByteIOContext *pb = s->pb;

  188.     AVStream *st;

  189.     ASFStream *asf_st;

  190.     int size, i;

  191.     int64_t gsize;

  192.     AVRational dar[128];

  193.     uint32_t bitrate[128];

  194. 

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

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

  197. 

  198.     get_guid(pb, &g);

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

  200.         return -1;

  201.     get_le64(pb);

  202.     get_le32(pb);

  203.     get_byte(pb);

  204.     get_byte(pb);

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

  206.     for(;;) {

  207.         get_guid(pb, &g);

  208.         gsize = get_le64(pb);

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

  210.         print_guid(&g);

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

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

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

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

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

  216.                 asf->data_object_size = gsize - 24;

  217.             } else {

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

  219.             }

  220.             break;

  221.         }

  222.         if (gsize < 24)

  223.             return -1;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  239.             enum AVMediaType type;

  240.             int type_specific_size, sizeX;

  241.             uint64_t total_size;

  242.             unsigned int tag1;

  243.             int64_t pos1, pos2, start_time;

  244.             int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  245. 

  246.             pos1 = url_ftell(pb);

  247. 

  248.             st = av_new_stream(s, 0);

  249.             if (!st)

  250.                 return AVERROR(ENOMEM);

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

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

  253.             if (!asf_st)

  254.                 return AVERROR(ENOMEM);

  255.             st->priv_data = asf_st;

  256.             start_time = asf->hdr.preroll;

  257. 

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

  259. 

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

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

  262.                     (10000000 / 1000) - start_time;

  263.             }

  264.             get_guid(pb, &g);

  265. 

  266.             test_for_ext_stream_audio = 0;

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

  268.                 type = AVMEDIA_TYPE_AUDIO;

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

  270.                 type = AVMEDIA_TYPE_VIDEO;

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

  272.                 type = AVMEDIA_TYPE_DATA;

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

  274.                 test_for_ext_stream_audio = 1;

  275.                 type = AVMEDIA_TYPE_UNKNOWN;

  276.             } else {

  277.                 return -1;

  278.             }

  279.             get_guid(pb, &g);

  280.             total_size = get_le64(pb);

  281.             type_specific_size = get_le32(pb);

  282.             get_le32(pb);

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

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

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

  286. 

  287.             get_le32(pb);

  288. 

  289.             if (test_for_ext_stream_audio) {

  290.                 get_guid(pb, &g);

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

  292.                     type = AVMEDIA_TYPE_AUDIO;

  293.                     is_dvr_ms_audio=1;

  294.                     get_guid(pb, &g);

  295.                     get_le32(pb);

  296.                     get_le32(pb);

  297.                     get_le32(pb);

  298.                     get_guid(pb, &g);

  299.                     get_le32(pb);

  300.                 }

  301.             }

  302. 

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

  304.             if (type == AVMEDIA_TYPE_AUDIO) {

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

  306.                 if (is_dvr_ms_audio) {

  307.                     // codec_id and codec_tag are unreliable in dvr_ms

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

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

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

  311.                 }

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

  313.                     st->need_parsing = AVSTREAM_PARSE_NONE;

  314.                 } else {

  315.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  316.                 }

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

  318.                 pos2 = url_ftell(pb);

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

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

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

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

  323.                     get_le16(pb); //ds_data_size

  324.                     get_byte(pb); //ds_silence_data

  325.                 }

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

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

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

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

  330.                     if (!asf_st->ds_chunk_size

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

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

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

  334.                 }

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

  336.                 case CODEC_ID_MP3:

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

  338.                     break;

  339.                 case CODEC_ID_PCM_S16LE:

  340.                 case CODEC_ID_PCM_S16BE:

  341.                 case CODEC_ID_PCM_U16LE:

  342.                 case CODEC_ID_PCM_U16BE:

  343.                 case CODEC_ID_PCM_S8:

  344.                 case CODEC_ID_PCM_U8:

  345.                 case CODEC_ID_PCM_ALAW:

  346.                 case CODEC_ID_PCM_MULAW:

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

  348.                     break;

  349.                 default:

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

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

  352.                     break;

  353.                 }

  354.             } else if (type == AVMEDIA_TYPE_VIDEO) {

  355.                 get_le32(pb);

  356.                 get_le32(pb);

  357.                 get_byte(pb);

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

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

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

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

  362.                 /* not available for asf */

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

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

  365.                 tag1 = get_le32(pb);

  366.                 url_fskip(pb, 20);

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

  368.                 size= sizeX;

  369.                 if (size > 40) {

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

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

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

  373.                 }

  374. 

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

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

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

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

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

  380. #if HAVE_BIGENDIAN

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

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

  383. #else

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

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

  386. #endif

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

  388.                 }

  389. 

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

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

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

  393.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  394.             }

  395.             pos2 = url_ftell(pb);

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

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

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

  399. 

  400.             len1 = get_le16(pb);

  401.             len2 = get_le16(pb);

  402.             len3 = get_le16(pb);

  403.             len4 = get_le16(pb);

  404.             len5 = get_le16(pb);

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

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

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

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

  409.             url_fskip(pb, len5);

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

  411.             int stream_count = get_le16(pb);

  412.             int j;

  413. 

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

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

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

  417.                 int flags, bitrate, stream_id;

  418. 

  419.                 flags= get_le16(pb);

  420.                 bitrate= get_le32(pb);

  421.                 stream_id= (flags & 0x7f);

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

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

  424.             }

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

  426.             int j;

  427.             int stream_count = get_le16(pb);

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

  429.                 char lang[6];

  430.                 unsigned int lang_len = get_byte(pb);

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

  432.                 if (j < 128)

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

  434.             }

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

  436.             int desc_count, i;

  437. 

  438.             desc_count = get_le16(pb);

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

  440.                     int name_len,value_type,value_len;

  441.                     char name[1024];

  442. 

  443.                     name_len = get_le16(pb);

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

  445.                         name_len += 1;

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

  447.                     value_type = get_le16(pb);

  448.                     value_len  = get_le16(pb);

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

  450.                         value_len += 1;

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

  452.             }

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

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

  455.             n = get_le16(pb);

  456. 

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

  458.                 char name[1024];

  459. 

  460.                 get_le16(pb); //lang_list_index

  461.                 stream_num= get_le16(pb);

  462.                 name_len=   get_le16(pb);

  463.                 value_type= get_le16(pb);

  464.                 value_len=  get_le32(pb);

  465. 

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

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

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

  469.                 url_fskip(pb, value_len - 2);

  470. 

  471.                 if(stream_num<128){

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

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

  474.                 }

  475.             }

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

  477.             int ext_len, payload_ext_ct, stream_ct;

  478.             uint32_t ext_d, leak_rate, stream_num;

  479.             unsigned int stream_languageid_index;

  480. 

  481.             get_le64(pb); // starttime

  482.             get_le64(pb); // endtime

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

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

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

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

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

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

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

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

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

  492. 

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

  494.             if (stream_num < 128)

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

  496. 

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

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

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

  500. 

  501.             if (stream_num < 128)

  502.                 bitrate[stream_num] = leak_rate;

  503. 

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

  505.                 get_le16(pb);

  506.                 ext_len = get_le16(pb);

  507.                 url_fseek(pb, ext_len, SEEK_CUR);

  508.             }

  509. 

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

  511.                 get_guid(pb, &g);

  512.                 ext_d=get_le16(pb);

  513.                 ext_len=get_le32(pb);

  514.                 url_fseek(pb, ext_len, SEEK_CUR);

  515.             }

  516. 

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

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

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

  520.             int v1, v2;

  521.             get_guid(pb, &g);

  522.             v1 = get_le32(pb);

  523.             v2 = get_le16(pb);

  524.         } else if (!guidcmp(&g, &ff_asf_marker_header)) {

  525.             int i, count, name_len;

  526.             char name[1024];

  527. 

  528.             get_le64(pb);            // reserved 16 bytes

  529.             get_le64(pb);            // ...

  530.             count = get_le32(pb);    // markers count

  531.             get_le16(pb);            // reserved 2 bytes

  532.             name_len = get_le16(pb); // name length

  533.             for(i=0;i<name_len;i++){

  534.                 get_byte(pb); // skip the name

  535.             }

  536. 

  537.             for(i=0;i<count;i++){

  538.                 int64_t pres_time;

  539.                 int name_len;

  540. 

  541.                 get_le64(pb);             // offset, 8 bytes

  542.                 pres_time = get_le64(pb); // presentation time

  543.                 get_le16(pb);             // entry length

  544.                 get_le32(pb);             // send time

  545.                 get_le32(pb);             // flags

  546.                 name_len = get_le32(pb);  // name length

  547.                 get_str16_nolen(pb, name_len * 2, name, sizeof(name));

  548.                 ff_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );

  549.             }

  550. #if 0

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

  552.             int len, v1, n, num;

  553.             char str[256], *q;

  554.             char tag[16];

  555. 

  556.             get_guid(pb, &g);

  557.             print_guid(&g);

  558. 

  559.             n = get_le32(pb);

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

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

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

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

  564.                 len = get_le16(pb);

  565.                 q = tag;

  566.                 while (len > 0) {

  567.                     v1 = get_byte(pb);

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

  569.                         *q++ = v1;

  570.                     len--;

  571.                 }

  572.                 *q = '\0';

  573.             }

  574. #endif

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

  576.             return -1;

  577.         } else {

  578.             if (!s->keylen) {

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

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

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

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

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

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

  585.                 }

  586.             }

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

  588.         }

  589.     }

  590.     get_guid(pb, &g);

  591.     get_le64(pb);

  592.     get_byte(pb);

  593.     get_byte(pb);

  594.     if (url_feof(pb))

  595.         return -1;

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

  597.     asf->packet_size_left = 0;

  598. 

  599. 

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

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

  602.         if(stream_num>=0){

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

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

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

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

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

  608.                           &st->sample_aspect_ratio.den,

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

  610. //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);

  611. 

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

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

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

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

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

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

  618.                     if (iso6392)

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

  620.                 }

  621.             }

  622.         }

  623.     }

  624. 

  625.     return 0;

  626. }

  627. 

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

  629.     switch (bits & 3) \

  630.     { \

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

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

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

  634.     default: var = defval; break; \

  635.     }

  636. 

  637. /**

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

  639.  * @param s demux context

  640.  * @param pb context to read data from

  641.  * @return 0 on success, <0 on error

  642.  */

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

  644. {

  645.     ASFContext *asf = s->priv_data;

  646.     uint32_t packet_length, padsize;

  647.     int rsize = 8;

  648.     int c, d, e, off;

  649. 

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

  651.     off= 32768;

  652.     if (s->packet_size > 0)

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

  654. 

  655.     c=d=e=-1;

  656.     while(off-- > 0){

  657.         c=d; d=e;

  658.         e= get_byte(pb);

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

  660.             break;

  661.     }

  662. 

  663.     if (c != 0x82) {

  664.         /**

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

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

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

  668.          * the stream.

  669.          */

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

  671.             return AVERROR(EAGAIN);

  672.         if (!url_feof(pb))

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

  674.     }

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

  676.         if (d || e) {

  677.             if (!url_feof(pb))

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

  679.             return -1;

  680.         }

  681.         c= get_byte(pb);

  682.         d= get_byte(pb);

  683.         rsize+=3;

  684.     }else{

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

  686.     }

  687. 

  688.     asf->packet_flags    = c;

  689.     asf->packet_property = d;

  690. 

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

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

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

  694. 

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

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

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

  698.         return -1;

  699.     }

  700.     if(padsize >= packet_length){

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

  702.         return -1;

  703.     }

  704. 

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

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

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

  708. 

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

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

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

  712.     } else {

  713.         asf->packet_segments = 1;

  714.         asf->packet_segsizetype = 0x80;

  715.     }

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

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

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

  719.     asf->packet_padsize = padsize;

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

  721.     return 0;

  722. }

  723. 

  724. /**

  725.  *

  726.  * @return <0 if error

  727.  */

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

  729.     ASFContext *asf = s->priv_data;

  730.     int rsize = 1;

  731.     int num = get_byte(pb);

  732.     int64_t ts0, ts1;

  733. 

  734.     asf->packet_segments--;

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

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

  737.     // sequence should be ignored!

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

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

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

  741. //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);

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

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

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

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

  746.             return -1;

  747.         }

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

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

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

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

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

  753.             url_fskip(pb, 10);

  754.             ts0= get_le64(pb);

  755.             ts1= get_le64(pb);

  756.             url_fskip(pb, 12);

  757.             get_le32(pb);

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

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

  760.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  761.         }else

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

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

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

  765.         // multipacket - frag_offset is beginning timestamp

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

  767.         asf->packet_frag_offset = 0;

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

  769. 

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

  771.         rsize++;

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

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

  774.         return -1;

  775.     }

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

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

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

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

  780.             return -1;

  781.         }

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

  783.     } else {

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

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

  786.     }

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

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

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

  790.             return -1;

  791.     }

  792.     asf->packet_size_left -= rsize;

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

  794. 

  795.     return 0;

  796. }

  797. 

  798. /**

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

  800.  * with asf_get_packet()).

  801.  * @param s demux context

  802.  * @param pb context to read data from

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

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

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

  806.  */

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

  808. {

  809.     ASFContext *asf = s->priv_data;

  810.     ASFStream *asf_st = 0;

  811.     for (;;) {

  812.         if(url_feof(pb))

  813.             return AVERROR_EOF;

  814.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  819.             assert(ret>=0);

  820.             /* fail safe */

  821.             url_fskip(pb, ret);

  822. 

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

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

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

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

  827.             return 1;

  828.         }

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

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

  831.                 asf->packet_segments= 0;

  832.                 continue;

  833.             }

  834.             if (asf->stream_index < 0

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

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

  837.                 ) {

  838.                 asf->packet_time_start = 0;

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

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

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

  842.                 if(asf->stream_index < 0)

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

  844.                 continue;

  845.             }

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

  847.         }

  848.         asf_st = asf->asf_st;

  849. 

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

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

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

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

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

  855.             asf->packet_size_left--;

  856.             asf->packet_multi_size--;

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

  858.             {

  859.                 asf->packet_time_start = 0;

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

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

  862.                 continue;

  863.             }

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

  865.             //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);

  866.         }

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

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

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

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

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

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

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

  874.         }

  875. 

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

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

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

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

  880.                 asf_st->frag_offset = 0;

  881.                 av_free_packet(&asf_st->pkt);

  882.             }

  883.             /* new packet */

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

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

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

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

  888.             asf_st->pkt.pos =

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

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

  891. //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,

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

  893.             if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)

  894.                 asf->packet_key_frame = 1;

  895.             if (asf->packet_key_frame)

  896.                 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;

  897.         }

  898. 

  899.         /* read data */

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

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

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

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

  904.         if (asf->packet_size_left < 0)

  905.             continue;

  906. 

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

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

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

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

  911.             continue;

  912.         }

  913. 

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

  915.                    asf->packet_frag_size);

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

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

  918.                             asf->packet_frag_size);

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

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

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

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

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

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

  925.                 int i;

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

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

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

  929.                     asf_st->frag_offset = 0;

  930.                     av_free_packet(&asf_st->pkt);

  931.                     continue;

  932.                 }

  933.             }

  934. 

  935.             /* return packet */

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

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

  938.                     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);

  939.               }else{

  940.                 /* packet descrambling */

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

  942.                 if (newdata) {

  943.                     int offset = 0;

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

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

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

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

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

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

  950. 

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

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

  953.                         memcpy(newdata + offset,

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

  955.                                asf_st->ds_chunk_size);

  956.                         offset += asf_st->ds_chunk_size;

  957.                     }

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

  959.                     asf_st->pkt.data = newdata;

  960.                 }

  961.               }

  962.             }

  963.             asf_st->frag_offset = 0;

  964.             *pkt= asf_st->pkt;

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

  966.             asf_st->pkt.size = 0;

  967.             asf_st->pkt.data = 0;

  968.             break; // packet completed

  969.         }

  970.     }

  971.     return 0;

  972. }

  973. 

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

  975. {

  976.     ASFContext *asf = s->priv_data;

  977. 

  978.     for (;;) {

  979.         int ret;

  980. 

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

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

  983.             return ret;

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

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

  986.         asf->packet_time_start = 0;

  987.     }

  988. 

  989.     return 0;

  990. }

  991. 

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

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

  994. // leftover information from previous reads

  995. static void asf_reset_header(AVFormatContext *s)

  996. {

  997.     ASFContext *asf = s->priv_data;

  998.     ASFStream *asf_st;

  999.     int i;

  1000. 

  1001.     asf->packet_nb_frames = 0;

  1002.     asf->packet_size_left = 0;

  1003.     asf->packet_segments = 0;

  1004.     asf->packet_flags = 0;

  1005.     asf->packet_property = 0;

  1006.     asf->packet_timestamp = 0;

  1007.     asf->packet_segsizetype = 0;

  1008.     asf->packet_segments = 0;

  1009.     asf->packet_seq = 0;

  1010.     asf->packet_replic_size = 0;

  1011.     asf->packet_key_frame = 0;

  1012.     asf->packet_padsize = 0;

  1013.     asf->packet_frag_offset = 0;

  1014.     asf->packet_frag_size = 0;

  1015.     asf->packet_frag_timestamp = 0;

  1016.     asf->packet_multi_size = 0;

  1017.     asf->packet_obj_size = 0;

  1018.     asf->packet_time_delta = 0;

  1019.     asf->packet_time_start = 0;

  1020. 

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

  1022.         asf_st= s->streams[i]->priv_data;

  1023.         av_free_packet(&asf_st->pkt);

  1024.         asf_st->frag_offset=0;

  1025.         asf_st->seq=0;

  1026.     }

  1027.     asf->asf_st= NULL;

  1028. }

  1029. 

  1030. static int asf_read_close(AVFormatContext *s)

  1031. {

  1032.     int i;

  1033. 

  1034.     asf_reset_header(s);

  1035.     for(i=0;i<s->nb_streams;i++) {

  1036.         AVStream *st = s->streams[i];

  1037.         av_free(st->codec->palctrl);

  1038.     }

  1039.     return 0;

  1040. }

  1041. 

  1042. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  1043. {

  1044.     AVPacket pkt1, *pkt = &pkt1;

  1045.     ASFStream *asf_st;

  1046.     int64_t pts;

  1047.     int64_t pos= *ppos;

  1048.     int i;

  1049.     int64_t start_pos[s->nb_streams];

  1050. 

  1051.     for(i=0; i<s->nb_streams; i++){

  1052.         start_pos[i]= pos;

  1053.     }

  1054. 

  1055.     if (s->packet_size > 0)

  1056.         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;

  1057.     *ppos= pos;

  1058.     url_fseek(s->pb, pos, SEEK_SET);

  1059. 

  1060. //printf("asf_read_pts\n");

  1061.     asf_reset_header(s);

  1062.     for(;;){

  1063.         if (av_read_frame(s, pkt) < 0){

  1064.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1065.             return AV_NOPTS_VALUE;

  1066.         }

  1067. 

  1068.         pts= pkt->pts;

  1069. 

  1070.         av_free_packet(pkt);

  1071.         if(pkt->flags&AV_PKT_FLAG_KEY){

  1072.             i= pkt->stream_index;

  1073. 

  1074.             asf_st= s->streams[i]->priv_data;

  1075. 

  1076. //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);

  1077.             pos= asf_st->packet_pos;

  1078. 

  1079.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1080.             start_pos[i]= asf_st->packet_pos + 1;

  1081. 

  1082.             if(pkt->stream_index == stream_index)

  1083.                break;

  1084.         }

  1085.     }

  1086. 

  1087.     *ppos= pos;

  1088. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1089. 

  1090.     return pts;

  1091. }

  1092. 

  1093. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1094. {

  1095.     ff_asf_guid g;

  1096.     ASFContext *asf = s->priv_data;

  1097.     int64_t current_pos= url_ftell(s->pb);

  1098.     int i;

  1099. 

  1100.     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);

  1101.     get_guid(s->pb, &g);

  1102.     if (!guidcmp(&g, &index_guid)) {

  1103.         int64_t itime, last_pos=-1;

  1104.         int pct, ict;

  1105.         int64_t av_unused gsize= get_le64(s->pb);

  1106.         get_guid(s->pb, &g);

  1107.         itime=get_le64(s->pb);

  1108.         pct=get_le32(s->pb);

  1109.         ict=get_le32(s->pb);

  1110.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1111. 

  1112.         for (i=0;i<ict;i++){

  1113.             int pktnum=get_le32(s->pb);

  1114.             int pktct =get_le16(s->pb);

  1115.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1116.             int64_t index_pts= av_rescale(itime, i, 10000);

  1117. 

  1118.             if(pos != last_pos){

  1119.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);

  1120.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1121.             last_pos=pos;

  1122.             }

  1123.         }

  1124.         asf->index_read= 1;

  1125.     }

  1126.     url_fseek(s->pb, current_pos, SEEK_SET);

  1127. }

  1128. 

  1129. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1130. {

  1131.     ASFContext *asf = s->priv_data;

  1132.     AVStream *st = s->streams[stream_index];

  1133.     int64_t pos;

  1134.     int index;

  1135. 

  1136.     if (s->packet_size <= 0)

  1137.         return -1;

  1138. 

  1139.     /* Try using the protocol's read_seek if available */

  1140.     if(s->pb) {

  1141.         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);

  1142.         if(ret >= 0)

  1143.             asf_reset_header(s);

  1144.         if (ret != AVERROR(ENOSYS))

  1145.             return ret;

  1146.     }

  1147. 

  1148.     if (!asf->index_read)

  1149.         asf_build_simple_index(s, stream_index);

  1150. 

  1151.     if(!(asf->index_read && st->index_entries)){

  1152.         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)

  1153.             return -1;

  1154.     }else{

  1155.         index= av_index_search_timestamp(st, pts, flags);

  1156.         if(index<0)

  1157.             return -1;

  1158. 

  1159.         /* find the position */

  1160.         pos = st->index_entries[index].pos;

  1161. 

  1162.     // various attempts to find key frame have failed so far

  1163.     //    asf_reset_header(s);

  1164.     //    url_fseek(s->pb, pos, SEEK_SET);

  1165.     //    key_pos = pos;

  1166.     //     for(i=0;i<16;i++){

  1167.     //         pos = url_ftell(s->pb);

  1168.     //         if (av_read_frame(s, &pkt) < 0){

  1169.     //             av_log(s, AV_LOG_INFO, "seek failed\n");

  1170.     //             return -1;

  1171.     //         }

  1172.     //         asf_st = s->streams[stream_index]->priv_data;

  1173.     //         pos += st->parser->frame_offset;

  1174.     //

  1175.     //         if (pkt.size > b) {

  1176.     //             b = pkt.size;

  1177.     //             key_pos = pos;

  1178.     //         }

  1179.     //

  1180.     //         av_free_packet(&pkt);

  1181.     //     }

  1182. 

  1183.         /* do the seek */

  1184.         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1185.         url_fseek(s->pb, pos, SEEK_SET);

  1186.     }

  1187.     asf_reset_header(s);

  1188.     return 0;

  1189. }

  1190. 

  1191. AVInputFormat asf_demuxer = {

  1192.     "asf",

  1193.     NULL_IF_CONFIG_SMALL("ASF format"),

  1194.     sizeof(ASFContext),

  1195.     asf_probe,

  1196.     asf_read_header,

  1197.     asf_read_packet,

  1198.     asf_read_close,

  1199.     asf_read_seek,

  1200.     asf_read_pts,

  1201.     .metadata_conv = ff_asf_metadata_conv,

  1202. };