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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 ASF_MAX_STREAMS 127

  39. #define FRAME_HEADER_SIZE 17

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

  41. 

  42. static const ff_asf_guid index_guid = {

  43.     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb

  44. };

  45. 

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

  47.     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2

  48. };

  49. /**********************************/

  50. /* decoding */

  51. 

  52. #ifdef DEBUG

  53. #define PRINT_IF_GUID(g,cmp) \

  54. if (!ff_guidcmp(g, &cmp)) \

  55.     av_dlog(NULL, "(GUID: %s) ", #cmp)

  56. 

  57. static void print_guid(const ff_asf_guid *g)

  58. {

  59.     int i;

  60.     PRINT_IF_GUID(g, ff_asf_header);

  61.     else PRINT_IF_GUID(g, ff_asf_file_header);

  62.     else PRINT_IF_GUID(g, ff_asf_stream_header);

  63.     else PRINT_IF_GUID(g, ff_asf_audio_stream);

  64.     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);

  65.     else PRINT_IF_GUID(g, ff_asf_video_stream);

  66.     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);

  67.     else PRINT_IF_GUID(g, ff_asf_command_stream);

  68.     else PRINT_IF_GUID(g, ff_asf_comment_header);

  69.     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);

  70.     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);

  71.     else PRINT_IF_GUID(g, ff_asf_data_header);

  72.     else PRINT_IF_GUID(g, index_guid);

  73.     else PRINT_IF_GUID(g, ff_asf_head1_guid);

  74.     else PRINT_IF_GUID(g, ff_asf_head2_guid);

  75.     else PRINT_IF_GUID(g, ff_asf_my_guid);

  76.     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);

  77.     else PRINT_IF_GUID(g, ff_asf_extended_content_header);

  78.     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);

  79.     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);

  80.     else PRINT_IF_GUID(g, ff_asf_metadata_header);

  81.     else PRINT_IF_GUID(g, ff_asf_marker_header);

  82.     else PRINT_IF_GUID(g, stream_bitrate_guid);

  83.     else PRINT_IF_GUID(g, ff_asf_language_guid);

  84.     else

  85.         av_dlog(NULL, "(GUID: unknown) ");

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

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

  88.     av_dlog(NULL, "}\n");

  89. }

  90. #undef PRINT_IF_GUID

  91. #else

  92. #define print_guid(g)

  93. #endif

  94. 

  95. void ff_get_guid(ByteIOContext *s, ff_asf_guid *g)

  96. {

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

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

  99. }

  100. 

  101. static int asf_probe(AVProbeData *pd)

  102. {

  103.     /* check file header */

  104.     if (!ff_guidcmp(pd->buf, &ff_asf_header))

  105.         return AVPROBE_SCORE_MAX;

  106.     else

  107.         return 0;

  108. }

  109. 

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

  111.     switch(type){

  112.         case 2: return get_le32(pb);

  113.         case 3: return get_le32(pb);

  114.         case 4: return get_le64(pb);

  115.         case 5: return get_le16(pb);

  116.         default:return INT_MIN;

  117.     }

  118. }

  119. 

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

  121. {

  122.     char *value;

  123.     int64_t off = url_ftell(s->pb);

  124. 

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

  126.         return;

  127. 

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

  129.     if (!value)

  130.         goto finish;

  131. 

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

  133.         avio_get_str16le(s->pb, len, value, 2*len + 1);

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

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

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

  137.     } else {

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

  139.         goto finish;

  140.     }

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

  142. finish:

  143.     av_freep(&value);

  144.     url_fseek(s->pb, off + len, SEEK_SET);

  145. }

  146. 

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

  148. {

  149.     ASFContext *asf = s->priv_data;

  150.     ff_asf_guid g;

  151.     ByteIOContext *pb = s->pb;

  152.     AVStream *st;

  153.     ASFStream *asf_st;

  154.     int size, i;

  155.     int64_t gsize;

  156.     AVRational dar[128];

  157.     uint32_t bitrate[128];

  158. 

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

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

  161. 

  162.     ff_get_guid(pb, &g);

  163.     if (ff_guidcmp(&g, &ff_asf_header))

  164.         return -1;

  165.     get_le64(pb);

  166.     get_le32(pb);

  167.     get_byte(pb);

  168.     get_byte(pb);

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

  170.     for(;;) {

  171.         uint64_t gpos= url_ftell(pb);

  172.         int ret;

  173.         ff_get_guid(pb, &g);

  174.         gsize = get_le64(pb);

  175.         av_dlog(s, "%08"PRIx64": ", gpos);

  176.         print_guid(&g);

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

  178.         if (!ff_guidcmp(&g, &ff_asf_data_header)) {

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

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

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

  182.                 asf->data_object_size = gsize - 24;

  183.             } else {

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

  185.             }

  186.             break;

  187.         }

  188.         if (gsize < 24)

  189.             return -1;

  190.         if (!ff_guidcmp(&g, &ff_asf_file_header)) {

  191.             ff_get_guid(pb, &asf->hdr.guid);

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

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

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

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

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

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

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

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

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

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

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

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

  204.         } else if (!ff_guidcmp(&g, &ff_asf_stream_header)) {

  205.             enum AVMediaType type;

  206.             int type_specific_size, sizeX;

  207.             uint64_t total_size;

  208.             unsigned int tag1;

  209.             int64_t pos1, pos2, start_time;

  210.             int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  211. 

  212.             if (s->nb_streams == ASF_MAX_STREAMS) {

  213.                 av_log(s, AV_LOG_ERROR, "too many streams\n");

  214.                 return AVERROR(EINVAL);

  215.             }

  216. 

  217.             pos1 = url_ftell(pb);

  218. 

  219.             st = av_new_stream(s, 0);

  220.             if (!st)

  221.                 return AVERROR(ENOMEM);

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

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

  224.             if (!asf_st)

  225.                 return AVERROR(ENOMEM);

  226.             st->priv_data = asf_st;

  227.             start_time = asf->hdr.preroll;

  228. 

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

  230. 

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

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

  233.                     (10000000 / 1000) - start_time;

  234.             }

  235.             ff_get_guid(pb, &g);

  236. 

  237.             test_for_ext_stream_audio = 0;

  238.             if (!ff_guidcmp(&g, &ff_asf_audio_stream)) {

  239.                 type = AVMEDIA_TYPE_AUDIO;

  240.             } else if (!ff_guidcmp(&g, &ff_asf_video_stream)) {

  241.                 type = AVMEDIA_TYPE_VIDEO;

  242.             } else if (!ff_guidcmp(&g, &ff_asf_jfif_media)) {

  243.                 type = AVMEDIA_TYPE_VIDEO;

  244.                 st->codec->codec_id = CODEC_ID_MJPEG;

  245.             } else if (!ff_guidcmp(&g, &ff_asf_command_stream)) {

  246.                 type = AVMEDIA_TYPE_DATA;

  247.             } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {

  248.                 test_for_ext_stream_audio = 1;

  249.                 type = AVMEDIA_TYPE_UNKNOWN;

  250.             } else {

  251.                 return -1;

  252.             }

  253.             ff_get_guid(pb, &g);

  254.             total_size = get_le64(pb);

  255.             type_specific_size = get_le32(pb);

  256.             get_le32(pb);

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

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

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

  260. 

  261.             get_le32(pb);

  262. 

  263.             if (test_for_ext_stream_audio) {

  264.                 ff_get_guid(pb, &g);

  265.                 if (!ff_guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {

  266.                     type = AVMEDIA_TYPE_AUDIO;

  267.                     is_dvr_ms_audio=1;

  268.                     ff_get_guid(pb, &g);

  269.                     get_le32(pb);

  270.                     get_le32(pb);

  271.                     get_le32(pb);

  272.                     ff_get_guid(pb, &g);

  273.                     get_le32(pb);

  274.                 }

  275.             }

  276. 

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

  278.             if (type == AVMEDIA_TYPE_AUDIO) {

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

  280.                 if (is_dvr_ms_audio) {

  281.                     // codec_id and codec_tag are unreliable in dvr_ms

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

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

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

  285.                 }

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

  287.                     st->need_parsing = AVSTREAM_PARSE_NONE;

  288.                 } else {

  289.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  290.                 }

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

  292.                 pos2 = url_ftell(pb);

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

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

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

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

  297.                     get_le16(pb); //ds_data_size

  298.                     get_byte(pb); //ds_silence_data

  299.                 }

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

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

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

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

  304.                     if (!asf_st->ds_chunk_size

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

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

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

  308.                 }

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

  310.                 case CODEC_ID_MP3:

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

  312.                     break;

  313.                 case CODEC_ID_PCM_S16LE:

  314.                 case CODEC_ID_PCM_S16BE:

  315.                 case CODEC_ID_PCM_U16LE:

  316.                 case CODEC_ID_PCM_U16BE:

  317.                 case CODEC_ID_PCM_S8:

  318.                 case CODEC_ID_PCM_U8:

  319.                 case CODEC_ID_PCM_ALAW:

  320.                 case CODEC_ID_PCM_MULAW:

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

  322.                     break;

  323.                 default:

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

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

  326.                     break;

  327.                 }

  328.             } else if (type == AVMEDIA_TYPE_VIDEO &&

  329.                        gsize - (url_ftell(pb) - pos1 + 24) >= 51) {

  330.                 get_le32(pb);

  331.                 get_le32(pb);

  332.                 get_byte(pb);

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

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

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

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

  337.                 /* not available for asf */

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

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

  340.                 tag1 = get_le32(pb);

  341.                 url_fskip(pb, 20);

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

  343.                 size= sizeX;

  344.                 if (size > 40) {

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

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

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

  348.                 }

  349. 

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

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

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

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

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

  355. #if HAVE_BIGENDIAN

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

  357.                         st->codec->palctrl->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);

  358. #else

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

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

  361. #endif

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

  363.                 }

  364. 

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

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

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

  368.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  369.                     // issue658 containse wrong w/h and MS even puts a fake seq header with wrong w/h in extradata while a correct one is in te stream. maximum lameness

  370.                     st->codec->width  =

  371.                     st->codec->height = 0;

  372.                     av_freep(&st->codec->extradata);

  373.                     st->codec->extradata_size=0;

  374.                 }

  375.                 if(st->codec->codec_id == CODEC_ID_H264)

  376.                     st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;

  377.             }

  378.             pos2 = url_ftell(pb);

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

  380.         } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {

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

  382. 

  383.             len1 = get_le16(pb);

  384.             len2 = get_le16(pb);

  385.             len3 = get_le16(pb);

  386.             len4 = get_le16(pb);

  387.             len5 = get_le16(pb);

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

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

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

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

  392.             url_fskip(pb, len5);

  393.         } else if (!ff_guidcmp(&g, &stream_bitrate_guid)) {

  394.             int stream_count = get_le16(pb);

  395.             int j;

  396. 

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

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

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

  400.                 int flags, bitrate, stream_id;

  401. 

  402.                 flags= get_le16(pb);

  403.                 bitrate= get_le32(pb);

  404.                 stream_id= (flags & 0x7f);

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

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

  407.             }

  408.         } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {

  409.             int j;

  410.             int stream_count = get_le16(pb);

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

  412.                 char lang[6];

  413.                 unsigned int lang_len = get_byte(pb);

  414.                 if ((ret = avio_get_str16le(pb, lang_len, lang, sizeof(lang))) < lang_len)

  415.                     url_fskip(pb, lang_len - ret);

  416.                 if (j < 128)

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

  418.             }

  419.         } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {

  420.             int desc_count, i;

  421. 

  422.             desc_count = get_le16(pb);

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

  424.                     int name_len,value_type,value_len;

  425.                     char name[1024];

  426. 

  427.                     name_len = get_le16(pb);

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

  429.                         name_len += 1;

  430.                     if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)

  431.                         url_fskip(pb, name_len - ret);

  432.                     value_type = get_le16(pb);

  433.                     value_len  = get_le16(pb);

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

  435.                         value_len += 1;

  436.                     /**

  437.                      * My sample has that stream set to 0 maybe that mean the container.

  438.                      * Asf stream count start at 1. I am using 0 to the container value since it's unused

  439.                      */

  440.                     if (!strcmp(name, "AspectRatioX")){

  441.                         dar[0].num= get_value(s->pb, value_type);

  442.                     } else if(!strcmp(name, "AspectRatioY")){

  443.                         dar[0].den= get_value(s->pb, value_type);

  444.                     } else

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

  446.             }

  447.         } else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {

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

  449.             n = get_le16(pb);

  450. 

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

  452.                 char name[1024];

  453. 

  454.                 get_le16(pb); //lang_list_index

  455.                 stream_num= get_le16(pb);

  456.                 name_len=   get_le16(pb);

  457.                 value_type= get_le16(pb);

  458.                 value_len=  get_le32(pb);

  459. 

  460.                 if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)

  461.                     url_fskip(pb, name_len - ret);

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

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

  464.                 url_fskip(pb, value_len - 2);

  465. 

  466.                 if(stream_num<128){

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

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

  469.                 }

  470.             }

  471.         } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_header)) {

  472.             int ext_len, payload_ext_ct, stream_ct;

  473.             uint32_t ext_d, leak_rate, stream_num;

  474.             unsigned int stream_languageid_index;

  475. 

  476.             get_le64(pb); // starttime

  477.             get_le64(pb); // endtime

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

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

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

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

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

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

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

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

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

  487. 

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

  489.             if (stream_num < 128)

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

  491. 

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

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

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

  495. 

  496.             if (stream_num < 128)

  497.                 bitrate[stream_num] = leak_rate;

  498. 

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

  500.                 get_le16(pb);

  501.                 ext_len = get_le16(pb);

  502.                 url_fseek(pb, ext_len, SEEK_CUR);

  503.             }

  504. 

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

  506.                 ff_get_guid(pb, &g);

  507.                 ext_d=get_le16(pb);

  508.                 ext_len=get_le32(pb);

  509.                 url_fseek(pb, ext_len, SEEK_CUR);

  510.             }

  511. 

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

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

  514.             continue;

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

  516.             int v1, v2;

  517.             ff_get_guid(pb, &g);

  518.             v1 = get_le32(pb);

  519.             v2 = get_le16(pb);

  520.             continue;

  521.         } else if (!ff_guidcmp(&g, &ff_asf_marker_header)) {

  522.             int i, count, name_len;

  523.             char name[1024];

  524. 

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

  526.             get_le64(pb);            // ...

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

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

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

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

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

  532.             }

  533. 

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

  535.                 int64_t pres_time;

  536.                 int name_len;

  537. 

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

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

  540.                 get_le16(pb);             // entry length

  541.                 get_le32(pb);             // send time

  542.                 get_le32(pb);             // flags

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

  544.                 if ((ret = avio_get_str16le(pb, name_len * 2, name, sizeof(name))) < name_len)

  545.                     url_fskip(pb, name_len - ret);

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

  547.             }

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

  549.             return -1;

  550.         } else {

  551.             if (!s->keylen) {

  552.                 if (!ff_guidcmp(&g, &ff_asf_content_encryption)) {

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

  554.                 } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {

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

  556.                 } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {

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

  558.                 }

  559.             }

  560.         }

  561.         if(url_ftell(pb) != gpos + gsize)

  562.             av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", url_ftell(pb)-gpos, gsize);

  563.         url_fseek(pb, gpos + gsize, SEEK_SET);

  564.     }

  565.     ff_get_guid(pb, &g);

  566.     get_le64(pb);

  567.     get_byte(pb);

  568.     get_byte(pb);

  569.     if (url_feof(pb))

  570.         return -1;

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

  572.     asf->packet_size_left = 0;

  573. 

  574. 

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

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

  577.         if(stream_num>=0){

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

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

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

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

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

  583.                           &st->sample_aspect_ratio.den,

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

  585.             } else if ((dar[0].num > 0) && (dar[0].den > 0) && (st->codec->codec_type==AVMEDIA_TYPE_VIDEO)) // Use ASF container value if the stream doesn't AR set.

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

  587.                           &st->sample_aspect_ratio.den,

  588.                           dar[0].num, dar[0].den, INT_MAX);

  589. 

  590. //av_log(s, AV_LOG_INFO, "i=%d, st->codec->codec_type:%d, dar %d:%d sar=%d:%d\n", i, st->codec->codec_type, dar[i].num, dar[i].den, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);

  591. 

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

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

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

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

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

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

  598.                     if (iso6392)

  599.                         av_metadata_set2(&st->metadata, "language", iso6392, 0);

  600.                 }

  601.             }

  602.         }

  603.     }

  604. 

  605.     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);

  606. 

  607.     return 0;

  608. }

  609. 

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

  611.     switch (bits & 3) \

  612.     { \

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

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

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

  616.     default: var = defval; break; \

  617.     }

  618. 

  619. /**

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

  621.  * @param s demux context

  622.  * @param pb context to read data from

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

  624.  */

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

  626. {

  627.     ASFContext *asf = s->priv_data;

  628.     uint32_t packet_length, padsize;

  629.     int rsize = 8;

  630.     int c, d, e, off;

  631. 

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

  633.     off= 32768;

  634.     if (s->packet_size > 0)

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

  636. 

  637.     c=d=e=-1;

  638.     while(off-- > 0){

  639.         c=d; d=e;

  640.         e= get_byte(pb);

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

  642.             break;

  643.     }

  644. 

  645.     if (c != 0x82) {

  646.         /**

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

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

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

  650.          * the stream.

  651.          */

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

  653.             return AVERROR(EAGAIN);

  654.         if (!url_feof(pb))

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

  656.     }

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

  658.         if (d || e) {

  659.             if (!url_feof(pb))

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

  661.             return -1;

  662.         }

  663.         c= get_byte(pb);

  664.         d= get_byte(pb);

  665.         rsize+=3;

  666.     }else{

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

  668.     }

  669. 

  670.     asf->packet_flags    = c;

  671.     asf->packet_property = d;

  672. 

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

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

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

  676. 

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

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

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

  680.         return -1;

  681.     }

  682.     if(padsize >= packet_length){

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

  684.         return -1;

  685.     }

  686. 

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

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

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

  690. 

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

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

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

  694.     } else {

  695.         asf->packet_segments = 1;

  696.         asf->packet_segsizetype = 0x80;

  697.     }

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

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

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

  701.     asf->packet_padsize = padsize;

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

  703.     return 0;

  704. }

  705. 

  706. /**

  707.  *

  708.  * @return <0 if error

  709.  */

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

  711.     ASFContext *asf = s->priv_data;

  712.     int rsize = 1;

  713.     int num = get_byte(pb);

  714.     int64_t ts0, ts1;

  715. 

  716.     asf->packet_segments--;

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

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

  719.     // sequence should be ignored!

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

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

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

  723. //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);

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

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

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

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

  728.             return -1;

  729.         }

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

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

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

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

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

  735.             url_fskip(pb, 10);

  736.             ts0= get_le64(pb);

  737.             ts1= get_le64(pb);

  738.             url_fskip(pb, 12);

  739.             get_le32(pb);

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

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

  742.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  743.         }else

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

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

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

  747.         // multipacket - frag_offset is beginning timestamp

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

  749.         asf->packet_frag_offset = 0;

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

  751. 

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

  753.         rsize++;

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

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

  756.         return -1;

  757.     }

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

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

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

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

  762.             return -1;

  763.         }

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

  765.     } else {

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

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

  768.     }

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

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

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

  772.             return -1;

  773.     }

  774.     asf->packet_size_left -= rsize;

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

  776. 

  777.     return 0;

  778. }

  779. 

  780. /**

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

  782.  * with asf_get_packet()).

  783.  * @param s demux context

  784.  * @param pb context to read data from

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

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

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

  788.  */

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

  790. {

  791.     ASFContext *asf = s->priv_data;

  792.     ASFStream *asf_st = 0;

  793.     for (;;) {

  794.         int ret;

  795.         if(url_feof(pb))

  796.             return AVERROR_EOF;

  797.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  802.             assert(ret>=0);

  803.             /* fail safe */

  804.             url_fskip(pb, ret);

  805. 

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

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

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

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

  810.             return 1;

  811.         }

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

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

  814.                 asf->packet_segments= 0;

  815.                 continue;

  816.             }

  817.             if (asf->stream_index < 0

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

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

  820.                 ) {

  821.                 asf->packet_time_start = 0;

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

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

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

  825.                 if(asf->stream_index < 0)

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

  827.                 continue;

  828.             }

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

  830.         }

  831.         asf_st = asf->asf_st;

  832. 

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

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

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

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

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

  838.             asf->packet_size_left--;

  839.             asf->packet_multi_size--;

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

  841.             {

  842.                 asf->packet_time_start = 0;

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

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

  845.                 continue;

  846.             }

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

  848.             //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);

  849.         }

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

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

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

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

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

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

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

  857.         }

  858. 

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

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

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

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

  863.                 asf_st->frag_offset = 0;

  864.                 av_free_packet(&asf_st->pkt);

  865.             }

  866.             /* new packet */

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

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

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

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

  871.             asf_st->pkt.pos =

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

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

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

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

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

  877.                 asf->packet_key_frame = 1;

  878.             if (asf->packet_key_frame)

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

  880.         }

  881. 

  882.         /* read data */

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

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

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

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

  887.         if (asf->packet_size_left < 0)

  888.             continue;

  889. 

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

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

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

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

  894.             continue;

  895.         }

  896. 

  897.         ret = get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,

  898.                          asf->packet_frag_size);

  899.         if (ret != asf->packet_frag_size) {

  900.             if (ret < 0 || asf->packet_frag_offset + ret == 0)

  901.                 return ret < 0 ? ret : AVERROR_EOF;

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

  903.                 // scrambling, we can either drop it completely or fill the remainder

  904.                 // TODO: should we fill the whole packet instead of just the current

  905.                 // fragment?

  906.                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,

  907.                        asf->packet_frag_size - ret);

  908.                 ret = asf->packet_frag_size;

  909.             } else

  910.                 // no scrambling, so we can return partial packets

  911.                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);

  912.         }

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

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

  915.                             ret);

  916.         asf_st->frag_offset += ret;

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

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

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

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

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

  922.                 int i;

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

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

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

  926.                     asf_st->frag_offset = 0;

  927.                     av_free_packet(&asf_st->pkt);

  928.                     continue;

  929.                 }

  930.             }

  931. 

  932.             /* return packet */

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

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

  935.                     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);

  936.               }else{

  937.                 /* packet descrambling */

  938.                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);

  939.                 if (newdata) {

  940.                     int offset = 0;

  941.                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

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

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

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

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

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

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

  948. 

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

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

  951.                         memcpy(newdata + offset,

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

  953.                                asf_st->ds_chunk_size);

  954.                         offset += asf_st->ds_chunk_size;

  955.                     }

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

  957.                     asf_st->pkt.data = newdata;

  958.                 }

  959.               }

  960.             }

  961.             asf_st->frag_offset = 0;

  962.             *pkt= asf_st->pkt;

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

  964.             asf_st->pkt.size = 0;

  965.             asf_st->pkt.data = 0;

  966.             break; // packet completed

  967.         }

  968.     }

  969.     return 0;

  970. }

  971. 

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

  973. {

  974.     ASFContext *asf = s->priv_data;

  975. 

  976.     for (;;) {

  977.         int ret;

  978. 

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

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

  981.             return ret;

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

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

  984.         asf->packet_time_start = 0;

  985.     }

  986. 

  987.     return 0;

  988. }

  989. 

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

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

  992. // leftover information from previous reads

  993. static void asf_reset_header(AVFormatContext *s)

  994. {

  995.     ASFContext *asf = s->priv_data;

  996.     ASFStream *asf_st;

  997.     int i;

  998. 

  999.     asf->packet_nb_frames = 0;

  1000.     asf->packet_size_left = 0;

  1001.     asf->packet_segments = 0;

  1002.     asf->packet_flags = 0;

  1003.     asf->packet_property = 0;

  1004.     asf->packet_timestamp = 0;

  1005.     asf->packet_segsizetype = 0;

  1006.     asf->packet_segments = 0;

  1007.     asf->packet_seq = 0;

  1008.     asf->packet_replic_size = 0;

  1009.     asf->packet_key_frame = 0;

  1010.     asf->packet_padsize = 0;

  1011.     asf->packet_frag_offset = 0;

  1012.     asf->packet_frag_size = 0;

  1013.     asf->packet_frag_timestamp = 0;

  1014.     asf->packet_multi_size = 0;

  1015.     asf->packet_obj_size = 0;

  1016.     asf->packet_time_delta = 0;

  1017.     asf->packet_time_start = 0;

  1018. 

  1019.     for(i=0; i<s->nb_streams; i++){

  1020.         asf_st= s->streams[i]->priv_data;

  1021.         av_free_packet(&asf_st->pkt);

  1022.         asf_st->frag_offset=0;

  1023.         asf_st->seq=0;

  1024.     }

  1025.     asf->asf_st= NULL;

  1026. }

  1027. 

  1028. static int asf_read_close(AVFormatContext *s)

  1029. {

  1030.     int i;

  1031. 

  1032.     asf_reset_header(s);

  1033.     for(i=0;i<s->nb_streams;i++) {

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

  1035.         av_free(st->codec->palctrl);

  1036.     }

  1037.     return 0;

  1038. }

  1039. 

  1040. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  1041. {

  1042.     AVPacket pkt1, *pkt = &pkt1;

  1043.     ASFStream *asf_st;

  1044.     int64_t pts;

  1045.     int64_t pos= *ppos;

  1046.     int i;

  1047.     int64_t start_pos[ASF_MAX_STREAMS];

  1048. 

  1049.     for(i=0; i<s->nb_streams; i++){

  1050.         start_pos[i]= pos;

  1051.     }

  1052. 

  1053.     if (s->packet_size > 0)

  1054.         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;

  1055.     *ppos= pos;

  1056.     url_fseek(s->pb, pos, SEEK_SET);

  1057. 

  1058. //printf("asf_read_pts\n");

  1059.     asf_reset_header(s);

  1060.     for(;;){

  1061.         if (av_read_frame(s, pkt) < 0){

  1062.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1063.             return AV_NOPTS_VALUE;

  1064.         }

  1065. 

  1066.         pts= pkt->pts;

  1067. 

  1068.         av_free_packet(pkt);

  1069.         if(pkt->flags&AV_PKT_FLAG_KEY){

  1070.             i= pkt->stream_index;

  1071. 

  1072.             asf_st= s->streams[i]->priv_data;

  1073. 

  1074. //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);

  1075.             pos= asf_st->packet_pos;

  1076. 

  1077.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1078.             start_pos[i]= asf_st->packet_pos + 1;

  1079. 

  1080.             if(pkt->stream_index == stream_index)

  1081.                break;

  1082.         }

  1083.     }

  1084. 

  1085.     *ppos= pos;

  1086. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1087. 

  1088.     return pts;

  1089. }

  1090. 

  1091. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1092. {

  1093.     ff_asf_guid g;

  1094.     ASFContext *asf = s->priv_data;

  1095.     int64_t current_pos= url_ftell(s->pb);

  1096.     int i;

  1097. 

  1098.     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);

  1099.     ff_get_guid(s->pb, &g);

  1100. 

  1101.     /* the data object can be followed by other top-level objects,

  1102.        skip them until the simple index object is reached */

  1103.     while (ff_guidcmp(&g, &index_guid)) {

  1104.         int64_t gsize= get_le64(s->pb);

  1105.         if (gsize < 24 || url_feof(s->pb)) {

  1106.             url_fseek(s->pb, current_pos, SEEK_SET);

  1107.             return;

  1108.         }

  1109.         url_fseek(s->pb, gsize-24, SEEK_CUR);

  1110.         ff_get_guid(s->pb, &g);

  1111.     }

  1112. 

  1113.     {

  1114.         int64_t itime, last_pos=-1;

  1115.         int pct, ict;

  1116.         int64_t av_unused gsize= get_le64(s->pb);

  1117.         ff_get_guid(s->pb, &g);

  1118.         itime=get_le64(s->pb);

  1119.         pct=get_le32(s->pb);

  1120.         ict=get_le32(s->pb);

  1121.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1122. 

  1123.         for (i=0;i<ict;i++){

  1124.             int pktnum=get_le32(s->pb);

  1125.             int pktct =get_le16(s->pb);

  1126.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1127.             int64_t index_pts= av_rescale(itime, i, 10000);

  1128. 

  1129.             if(pos != last_pos){

  1130.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);

  1131.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1132.             last_pos=pos;

  1133.             }

  1134.         }

  1135.         asf->index_read= 1;

  1136.     }

  1137.     url_fseek(s->pb, current_pos, SEEK_SET);

  1138. }

  1139. 

  1140. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1141. {

  1142.     ASFContext *asf = s->priv_data;

  1143.     AVStream *st = s->streams[stream_index];

  1144.     int64_t pos;

  1145.     int index;

  1146. 

  1147.     if (s->packet_size <= 0)

  1148.         return -1;

  1149. 

  1150.     /* Try using the protocol's read_seek if available */

  1151.     if(s->pb) {

  1152.         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);

  1153.         if(ret >= 0)

  1154.             asf_reset_header(s);

  1155.         if (ret != AVERROR(ENOSYS))

  1156.             return ret;

  1157.     }

  1158. 

  1159.     if (!asf->index_read)

  1160.         asf_build_simple_index(s, stream_index);

  1161. 

  1162.     if(!(asf->index_read && st->index_entries)){

  1163.         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)

  1164.             return -1;

  1165.     }else{

  1166.         index= av_index_search_timestamp(st, pts, flags);

  1167.         if(index<0)

  1168.             return -1;

  1169. 

  1170.         /* find the position */

  1171.         pos = st->index_entries[index].pos;

  1172. 

  1173.     // various attempts to find key frame have failed so far

  1174.     //    asf_reset_header(s);

  1175.     //    url_fseek(s->pb, pos, SEEK_SET);

  1176.     //    key_pos = pos;

  1177.     //     for(i=0;i<16;i++){

  1178.     //         pos = url_ftell(s->pb);

  1179.     //         if (av_read_frame(s, &pkt) < 0){

  1180.     //             av_log(s, AV_LOG_INFO, "seek failed\n");

  1181.     //             return -1;

  1182.     //         }

  1183.     //         asf_st = s->streams[stream_index]->priv_data;

  1184.     //         pos += st->parser->frame_offset;

  1185.     //

  1186.     //         if (pkt.size > b) {

  1187.     //             b = pkt.size;

  1188.     //             key_pos = pos;

  1189.     //         }

  1190.     //

  1191.     //         av_free_packet(&pkt);

  1192.     //     }

  1193. 

  1194.         /* do the seek */

  1195.         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1196.         url_fseek(s->pb, pos, SEEK_SET);

  1197.     }

  1198.     asf_reset_header(s);

  1199.     return 0;

  1200. }

  1201. 

  1202. AVInputFormat ff_asf_demuxer = {

  1203.     "asf",

  1204.     NULL_IF_CONFIG_SMALL("ASF format"),

  1205.     sizeof(ASFContext),

  1206.     asf_probe,

  1207.     asf_read_header,

  1208.     asf_read_packet,

  1209.     asf_read_close,

  1210.     asf_read_seek,

  1211.     asf_read_pts,

  1212. };