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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. int ff_guidcmp(const void *g1, const void *g2)

  53. {

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

  55. }

  56. 

  57. #ifdef DEBUG

  58. #define PRINT_IF_GUID(g,cmp) \

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

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

  61. 

  62. static void print_guid(const ff_asf_guid *g)

  63. {

  64.     int i;

  65.     PRINT_IF_GUID(g, ff_asf_header);

  66.     else PRINT_IF_GUID(g, ff_asf_file_header);

  67.     else PRINT_IF_GUID(g, ff_asf_stream_header);

  68.     else PRINT_IF_GUID(g, ff_asf_audio_stream);

  69.     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);

  70.     else PRINT_IF_GUID(g, ff_asf_video_stream);

  71.     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);

  72.     else PRINT_IF_GUID(g, ff_asf_command_stream);

  73.     else PRINT_IF_GUID(g, ff_asf_comment_header);

  74.     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);

  75.     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);

  76.     else PRINT_IF_GUID(g, ff_asf_data_header);

  77.     else PRINT_IF_GUID(g, index_guid);

  78.     else PRINT_IF_GUID(g, ff_asf_head1_guid);

  79.     else PRINT_IF_GUID(g, ff_asf_head2_guid);

  80.     else PRINT_IF_GUID(g, ff_asf_my_guid);

  81.     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);

  82.     else PRINT_IF_GUID(g, ff_asf_extended_content_header);

  83.     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);

  84.     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);

  85.     else PRINT_IF_GUID(g, ff_asf_metadata_header);

  86.     else PRINT_IF_GUID(g, ff_asf_marker_header);

  87.     else PRINT_IF_GUID(g, stream_bitrate_guid);

  88.     else PRINT_IF_GUID(g, ff_asf_language_guid);

  89.     else

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

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

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

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

  94. }

  95. #undef PRINT_IF_GUID

  96. #else

  97. #define print_guid(g)

  98. #endif

  99. 

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

  101. {

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

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

  104. }

  105. 

  106. #if 0

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

  108. {

  109.     int len, c;

  110.     char *q;

  111. 

  112.     len = get_le16(pb);

  113.     q = buf;

  114.     while (len > 0) {

  115.         c = get_le16(pb);

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

  117.             *q++ = c;

  118.         len--;

  119.     }

  120.     *q = '\0';

  121. }

  122. #endif

  123. 

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

  125. {

  126.     char* q = buf;

  127.     while (len > 1) {

  128.         uint8_t tmp;

  129.         uint32_t ch;

  130. 

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

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

  133.     }

  134.     if (len > 0)

  135.         url_fskip(pb, len);

  136.     *q = '\0';

  137. }

  138. 

  139. static int asf_probe(AVProbeData *pd)

  140. {

  141.     /* check file header */

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

  143.         return AVPROBE_SCORE_MAX;

  144.     else

  145.         return 0;

  146. }

  147. 

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

  149.     switch(type){

  150.         case 2: return get_le32(pb);

  151.         case 3: return get_le32(pb);

  152.         case 4: return get_le64(pb);

  153.         case 5: return get_le16(pb);

  154.         default:return INT_MIN;

  155.     }

  156. }

  157. 

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

  159. {

  160.     char *value;

  161. 

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

  163.         return;

  164. 

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

  166.     if (!value)

  167.         return;

  168. 

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

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

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

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

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

  174.     } else {

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

  176.         av_freep(&value);

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

  178.         return;

  179.     }

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

  181.     av_freep(&value);

  182. }

  183. 

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

  185. {

  186.     ASFContext *asf = s->priv_data;

  187.     ff_asf_guid g;

  188.     ByteIOContext *pb = s->pb;

  189.     AVStream *st;

  190.     ASFStream *asf_st;

  191.     int size, i;

  192.     int64_t gsize;

  193.     AVRational dar[128];

  194.     uint32_t bitrate[128];

  195. 

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

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

  198. 

  199.     ff_get_guid(pb, &g);

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

  201.         return -1;

  202.     get_le64(pb);

  203.     get_le32(pb);

  204.     get_byte(pb);

  205.     get_byte(pb);

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

  207.     for(;;) {

  208.         uint64_t gpos= url_ftell(pb);

  209.         ff_get_guid(pb, &g);

  210.         gsize = get_le64(pb);

  211.         dprintf(s, "%08"PRIx64": ", gpos);

  212.         print_guid(&g);

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

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

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

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

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

  218.                 asf->data_object_size = gsize - 24;

  219.             } else {

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

  221.             }

  222.             break;

  223.         }

  224.         if (gsize < 24)

  225.             return -1;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  241.             enum AVMediaType type;

  242.             int type_specific_size, sizeX;

  243.             uint64_t total_size;

  244.             unsigned int tag1;

  245.             int64_t pos1, pos2, start_time;

  246.             int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  247. 

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

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

  250.                 return AVERROR(EINVAL);

  251.             }

  252. 

  253.             pos1 = url_ftell(pb);

  254. 

  255.             st = av_new_stream(s, 0);

  256.             if (!st)

  257.                 return AVERROR(ENOMEM);

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

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

  260.             if (!asf_st)

  261.                 return AVERROR(ENOMEM);

  262.             st->priv_data = asf_st;

  263.             start_time = asf->hdr.preroll;

  264. 

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

  266. 

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

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

  269.                     (10000000 / 1000) - start_time;

  270.             }

  271.             ff_get_guid(pb, &g);

  272. 

  273.             test_for_ext_stream_audio = 0;

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

  275.                 type = AVMEDIA_TYPE_AUDIO;

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

  277.                 type = AVMEDIA_TYPE_VIDEO;

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

  279.                 type = AVMEDIA_TYPE_VIDEO;

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

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

  282.                 type = AVMEDIA_TYPE_DATA;

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

  284.                 test_for_ext_stream_audio = 1;

  285.                 type = AVMEDIA_TYPE_UNKNOWN;

  286.             } else {

  287.                 return -1;

  288.             }

  289.             ff_get_guid(pb, &g);

  290.             total_size = get_le64(pb);

  291.             type_specific_size = get_le32(pb);

  292.             get_le32(pb);

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

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

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

  296. 

  297.             get_le32(pb);

  298. 

  299.             if (test_for_ext_stream_audio) {

  300.                 ff_get_guid(pb, &g);

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

  302.                     type = AVMEDIA_TYPE_AUDIO;

  303.                     is_dvr_ms_audio=1;

  304.                     ff_get_guid(pb, &g);

  305.                     get_le32(pb);

  306.                     get_le32(pb);

  307.                     get_le32(pb);

  308.                     ff_get_guid(pb, &g);

  309.                     get_le32(pb);

  310.                 }

  311.             }

  312. 

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

  314.             if (type == AVMEDIA_TYPE_AUDIO) {

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

  316.                 if (is_dvr_ms_audio) {

  317.                     // codec_id and codec_tag are unreliable in dvr_ms

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

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

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

  321.                 }

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

  323.                     st->need_parsing = AVSTREAM_PARSE_NONE;

  324.                 } else {

  325.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  326.                 }

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

  328.                 pos2 = url_ftell(pb);

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

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

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

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

  333.                     get_le16(pb); //ds_data_size

  334.                     get_byte(pb); //ds_silence_data

  335.                 }

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

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

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

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

  340.                     if (!asf_st->ds_chunk_size

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

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

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

  344.                 }

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

  346.                 case CODEC_ID_MP3:

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

  348.                     break;

  349.                 case CODEC_ID_PCM_S16LE:

  350.                 case CODEC_ID_PCM_S16BE:

  351.                 case CODEC_ID_PCM_U16LE:

  352.                 case CODEC_ID_PCM_U16BE:

  353.                 case CODEC_ID_PCM_S8:

  354.                 case CODEC_ID_PCM_U8:

  355.                 case CODEC_ID_PCM_ALAW:

  356.                 case CODEC_ID_PCM_MULAW:

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

  358.                     break;

  359.                 default:

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

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

  362.                     break;

  363.                 }

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

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

  366.                 get_le32(pb);

  367.                 get_le32(pb);

  368.                 get_byte(pb);

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

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

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

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

  373.                 /* not available for asf */

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

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

  376.                 tag1 = get_le32(pb);

  377.                 url_fskip(pb, 20);

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

  379.                 size= sizeX;

  380.                 if (size > 40) {

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

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

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

  384.                 }

  385. 

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

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

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

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

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

  391. #if HAVE_BIGENDIAN

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

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

  394. #else

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

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

  397. #endif

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

  399.                 }

  400. 

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

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

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

  404.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  405.                     // 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

  406.                     st->codec->width  =

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

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

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

  410.                 }

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

  412.                     st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;

  413.             }

  414.             pos2 = url_ftell(pb);

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

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

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

  418. 

  419.             len1 = get_le16(pb);

  420.             len2 = get_le16(pb);

  421.             len3 = get_le16(pb);

  422.             len4 = get_le16(pb);

  423.             len5 = get_le16(pb);

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

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

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

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

  428.             url_fskip(pb, len5);

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

  430.             int stream_count = get_le16(pb);

  431.             int j;

  432. 

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

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

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

  436.                 int flags, bitrate, stream_id;

  437. 

  438.                 flags= get_le16(pb);

  439.                 bitrate= get_le32(pb);

  440.                 stream_id= (flags & 0x7f);

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

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

  443.             }

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

  445.             int j;

  446.             int stream_count = get_le16(pb);

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

  448.                 char lang[6];

  449.                 unsigned int lang_len = get_byte(pb);

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

  451.                 if (j < 128)

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

  453.             }

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

  455.             int desc_count, i;

  456. 

  457.             desc_count = get_le16(pb);

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

  459.                     int name_len,value_type,value_len;

  460.                     char name[1024];

  461. 

  462.                     name_len = get_le16(pb);

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

  464.                         name_len += 1;

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

  466.                     value_type = get_le16(pb);

  467.                     value_len  = get_le16(pb);

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

  469.                         value_len += 1;

  470.                     /**

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

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

  473.                      */

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

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

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

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

  478.                     } else

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

  480.             }

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

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

  483.             n = get_le16(pb);

  484. 

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

  486.                 char name[1024];

  487. 

  488.                 get_le16(pb); //lang_list_index

  489.                 stream_num= get_le16(pb);

  490.                 name_len=   get_le16(pb);

  491.                 value_type= get_le16(pb);

  492.                 value_len=  get_le32(pb);

  493. 

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

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

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

  497.                 url_fskip(pb, value_len - 2);

  498. 

  499.                 if(stream_num<128){

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

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

  502.                 }

  503.             }

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

  505.             int ext_len, payload_ext_ct, stream_ct;

  506.             uint32_t ext_d, leak_rate, stream_num;

  507.             unsigned int stream_languageid_index;

  508. 

  509.             get_le64(pb); // starttime

  510.             get_le64(pb); // endtime

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

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

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

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

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

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

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

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

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

  520. 

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

  522.             if (stream_num < 128)

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

  524. 

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

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

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

  528. 

  529.             if (stream_num < 128)

  530.                 bitrate[stream_num] = leak_rate;

  531. 

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

  533.                 get_le16(pb);

  534.                 ext_len = get_le16(pb);

  535.                 url_fseek(pb, ext_len, SEEK_CUR);

  536.             }

  537. 

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

  539.                 ff_get_guid(pb, &g);

  540.                 ext_d=get_le16(pb);

  541.                 ext_len=get_le32(pb);

  542.                 url_fseek(pb, ext_len, SEEK_CUR);

  543.             }

  544. 

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

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

  547.             continue;

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

  549.             int v1, v2;

  550.             ff_get_guid(pb, &g);

  551.             v1 = get_le32(pb);

  552.             v2 = get_le16(pb);

  553.             continue;

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

  555.             int i, count, name_len;

  556.             char name[1024];

  557. 

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

  559.             get_le64(pb);            // ...

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

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

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

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

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

  565.             }

  566. 

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

  568.                 int64_t pres_time;

  569.                 int name_len;

  570. 

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

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

  573.                 get_le16(pb);             // entry length

  574.                 get_le32(pb);             // send time

  575.                 get_le32(pb);             // flags

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

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

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

  579.             }

  580. #if 0

  581.         } else if (!ff_guidcmp(&g, &ff_asf_codec_comment_header)) {

  582.             int len, v1, n, num;

  583.             char str[256], *q;

  584.             char tag[16];

  585. 

  586.             ff_get_guid(pb, &g);

  587.             print_guid(&g);

  588. 

  589.             n = get_le32(pb);

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

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

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

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

  594.                 len = get_le16(pb);

  595.                 q = tag;

  596.                 while (len > 0) {

  597.                     v1 = get_byte(pb);

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

  599.                         *q++ = v1;

  600.                     len--;

  601.                 }

  602.                 *q = '\0';

  603.             }

  604. #endif

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

  606.             return -1;

  607.         } else {

  608.             if (!s->keylen) {

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

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

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

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

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

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

  615.                 }

  616.             }

  617.         }

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

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

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

  621.     }

  622.     ff_get_guid(pb, &g);

  623.     get_le64(pb);

  624.     get_byte(pb);

  625.     get_byte(pb);

  626.     if (url_feof(pb))

  627.         return -1;

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

  629.     asf->packet_size_left = 0;

  630. 

  631. 

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

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

  634.         if(stream_num>=0){

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

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

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

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

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

  640.                           &st->sample_aspect_ratio.den,

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

  642.             } 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.

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

  644.                           &st->sample_aspect_ratio.den,

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

  646. 

  647. //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);

  648. 

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

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

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

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

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

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

  655.                     if (iso6392)

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

  657.                 }

  658.             }

  659.         }

  660.     }

  661. 

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

  663. 

  664.     return 0;

  665. }

  666. 

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

  668.     switch (bits & 3) \

  669.     { \

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

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

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

  673.     default: var = defval; break; \

  674.     }

  675. 

  676. /**

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

  678.  * @param s demux context

  679.  * @param pb context to read data from

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

  681.  */

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

  683. {

  684.     ASFContext *asf = s->priv_data;

  685.     uint32_t packet_length, padsize;

  686.     int rsize = 8;

  687.     int c, d, e, off;

  688. 

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

  690.     off= 32768;

  691.     if (s->packet_size > 0)

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

  693. 

  694.     c=d=e=-1;

  695.     while(off-- > 0){

  696.         c=d; d=e;

  697.         e= get_byte(pb);

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

  699.             break;

  700.     }

  701. 

  702.     if (c != 0x82) {

  703.         /**

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

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

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

  707.          * the stream.

  708.          */

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

  710.             return AVERROR(EAGAIN);

  711.         if (!url_feof(pb))

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

  713.     }

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

  715.         if (d || e) {

  716.             if (!url_feof(pb))

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

  718.             return -1;

  719.         }

  720.         c= get_byte(pb);

  721.         d= get_byte(pb);

  722.         rsize+=3;

  723.     }else{

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

  725.     }

  726. 

  727.     asf->packet_flags    = c;

  728.     asf->packet_property = d;

  729. 

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

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

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

  733. 

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

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

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

  737.         return -1;

  738.     }

  739.     if(padsize >= packet_length){

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

  741.         return -1;

  742.     }

  743. 

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

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

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

  747. 

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

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

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

  751.     } else {

  752.         asf->packet_segments = 1;

  753.         asf->packet_segsizetype = 0x80;

  754.     }

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

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

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

  758.     asf->packet_padsize = padsize;

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

  760.     return 0;

  761. }

  762. 

  763. /**

  764.  *

  765.  * @return <0 if error

  766.  */

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

  768.     ASFContext *asf = s->priv_data;

  769.     int rsize = 1;

  770.     int num = get_byte(pb);

  771.     int64_t ts0, ts1;

  772. 

  773.     asf->packet_segments--;

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

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

  776.     // sequence should be ignored!

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

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

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

  780. //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);

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

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

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

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

  785.             return -1;

  786.         }

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

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

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

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

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

  792.             url_fskip(pb, 10);

  793.             ts0= get_le64(pb);

  794.             ts1= get_le64(pb);

  795.             url_fskip(pb, 12);

  796.             get_le32(pb);

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

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

  799.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  800.         }else

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

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

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

  804.         // multipacket - frag_offset is beginning timestamp

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

  806.         asf->packet_frag_offset = 0;

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

  808. 

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

  810.         rsize++;

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

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

  813.         return -1;

  814.     }

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

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

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

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

  819.             return -1;

  820.         }

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

  822.     } else {

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

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

  825.     }

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

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

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

  829.             return -1;

  830.     }

  831.     asf->packet_size_left -= rsize;

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

  833. 

  834.     return 0;

  835. }

  836. 

  837. /**

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

  839.  * with asf_get_packet()).

  840.  * @param s demux context

  841.  * @param pb context to read data from

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

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

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

  845.  */

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

  847. {

  848.     ASFContext *asf = s->priv_data;

  849.     ASFStream *asf_st = 0;

  850.     for (;;) {

  851.         int ret;

  852.         if(url_feof(pb))

  853.             return AVERROR_EOF;

  854.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  859.             assert(ret>=0);

  860.             /* fail safe */

  861.             url_fskip(pb, ret);

  862. 

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

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

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

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

  867.             return 1;

  868.         }

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

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

  871.                 asf->packet_segments= 0;

  872.                 continue;

  873.             }

  874.             if (asf->stream_index < 0

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

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

  877.                 ) {

  878.                 asf->packet_time_start = 0;

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

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

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

  882.                 if(asf->stream_index < 0)

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

  884.                 continue;

  885.             }

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

  887.         }

  888.         asf_st = asf->asf_st;

  889. 

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

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

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

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

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

  895.             asf->packet_size_left--;

  896.             asf->packet_multi_size--;

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

  898.             {

  899.                 asf->packet_time_start = 0;

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

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

  902.                 continue;

  903.             }

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

  905.             //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);

  906.         }

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

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

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

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

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

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

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

  914.         }

  915. 

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

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

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

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

  920.                 asf_st->frag_offset = 0;

  921.                 av_free_packet(&asf_st->pkt);

  922.             }

  923.             /* new packet */

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

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

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

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

  928.             asf_st->pkt.pos =

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

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

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

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

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

  934.                 asf->packet_key_frame = 1;

  935.             if (asf->packet_key_frame)

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

  937.         }

  938. 

  939.         /* read data */

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

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

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

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

  944.         if (asf->packet_size_left < 0)

  945.             continue;

  946. 

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

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

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

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

  951.             continue;

  952.         }

  953. 

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

  955.                          asf->packet_frag_size);

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

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

  958.                 return ret < 0 ? ret : AVERROR_EOF;

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

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

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

  962.                 // fragment?

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

  964.                        asf->packet_frag_size - ret);

  965.                 ret = asf->packet_frag_size;

  966.             } else

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

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

  969.         }

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

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

  972.                             ret);

  973.         asf_st->frag_offset += ret;

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

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

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

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

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

  979.                 int i;

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

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

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

  983.                     asf_st->frag_offset = 0;

  984.                     av_free_packet(&asf_st->pkt);

  985.                     continue;

  986.                 }

  987.             }

  988. 

  989.             /* return packet */

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

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

  992.                     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);

  993.               }else{

  994.                 /* packet descrambling */

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

  996.                 if (newdata) {

  997.                     int offset = 0;

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

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

  1000.                         int off = offset / asf_st->ds_chunk_size;

  1001.                         int row = off / asf_st->ds_span;

  1002.                         int col = off % asf_st->ds_span;

  1003.                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;

  1004.                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);

  1005. 

  1006.                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);

  1007.                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);

  1008.                         memcpy(newdata + offset,

  1009.                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,

  1010.                                asf_st->ds_chunk_size);

  1011.                         offset += asf_st->ds_chunk_size;

  1012.                     }

  1013.                     av_free(asf_st->pkt.data);

  1014.                     asf_st->pkt.data = newdata;

  1015.                 }

  1016.               }

  1017.             }

  1018.             asf_st->frag_offset = 0;

  1019.             *pkt= asf_st->pkt;

  1020.             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);

  1021.             asf_st->pkt.size = 0;

  1022.             asf_st->pkt.data = 0;

  1023.             break; // packet completed

  1024.         }

  1025.     }

  1026.     return 0;

  1027. }

  1028. 

  1029. static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)

  1030. {

  1031.     ASFContext *asf = s->priv_data;

  1032. 

  1033.     for (;;) {

  1034.         int ret;

  1035. 

  1036.         /* parse cached packets, if any */

  1037.         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)

  1038.             return ret;

  1039.         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)

  1040.             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);

  1041.         asf->packet_time_start = 0;

  1042.     }

  1043. 

  1044.     return 0;

  1045. }

  1046. 

  1047. // Added to support seeking after packets have been read

  1048. // If information is not reset, read_packet fails due to

  1049. // leftover information from previous reads

  1050. static void asf_reset_header(AVFormatContext *s)

  1051. {

  1052.     ASFContext *asf = s->priv_data;

  1053.     ASFStream *asf_st;

  1054.     int i;

  1055. 

  1056.     asf->packet_nb_frames = 0;

  1057.     asf->packet_size_left = 0;

  1058.     asf->packet_segments = 0;

  1059.     asf->packet_flags = 0;

  1060.     asf->packet_property = 0;

  1061.     asf->packet_timestamp = 0;

  1062.     asf->packet_segsizetype = 0;

  1063.     asf->packet_segments = 0;

  1064.     asf->packet_seq = 0;

  1065.     asf->packet_replic_size = 0;

  1066.     asf->packet_key_frame = 0;

  1067.     asf->packet_padsize = 0;

  1068.     asf->packet_frag_offset = 0;

  1069.     asf->packet_frag_size = 0;

  1070.     asf->packet_frag_timestamp = 0;

  1071.     asf->packet_multi_size = 0;

  1072.     asf->packet_obj_size = 0;

  1073.     asf->packet_time_delta = 0;

  1074.     asf->packet_time_start = 0;

  1075. 

  1076.     for(i=0; i<s->nb_streams; i++){

  1077.         asf_st= s->streams[i]->priv_data;

  1078.         av_free_packet(&asf_st->pkt);

  1079.         asf_st->frag_offset=0;

  1080.         asf_st->seq=0;

  1081.     }

  1082.     asf->asf_st= NULL;

  1083. }

  1084. 

  1085. static int asf_read_close(AVFormatContext *s)

  1086. {

  1087.     int i;

  1088. 

  1089.     asf_reset_header(s);

  1090.     for(i=0;i<s->nb_streams;i++) {

  1091.         AVStream *st = s->streams[i];

  1092.         av_free(st->codec->palctrl);

  1093.     }

  1094.     return 0;

  1095. }

  1096. 

  1097. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  1098. {

  1099.     AVPacket pkt1, *pkt = &pkt1;

  1100.     ASFStream *asf_st;

  1101.     int64_t pts;

  1102.     int64_t pos= *ppos;

  1103.     int i;

  1104.     int64_t start_pos[ASF_MAX_STREAMS];

  1105. 

  1106.     for(i=0; i<s->nb_streams; i++){

  1107.         start_pos[i]= pos;

  1108.     }

  1109. 

  1110.     if (s->packet_size > 0)

  1111.         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;

  1112.     *ppos= pos;

  1113.     url_fseek(s->pb, pos, SEEK_SET);

  1114. 

  1115. //printf("asf_read_pts\n");

  1116.     asf_reset_header(s);

  1117.     for(;;){

  1118.         if (av_read_frame(s, pkt) < 0){

  1119.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1120.             return AV_NOPTS_VALUE;

  1121.         }

  1122. 

  1123.         pts= pkt->pts;

  1124. 

  1125.         av_free_packet(pkt);

  1126.         if(pkt->flags&AV_PKT_FLAG_KEY){

  1127.             i= pkt->stream_index;

  1128. 

  1129.             asf_st= s->streams[i]->priv_data;

  1130. 

  1131. //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);

  1132.             pos= asf_st->packet_pos;

  1133. 

  1134.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1135.             start_pos[i]= asf_st->packet_pos + 1;

  1136. 

  1137.             if(pkt->stream_index == stream_index)

  1138.                break;

  1139.         }

  1140.     }

  1141. 

  1142.     *ppos= pos;

  1143. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1144. 

  1145.     return pts;

  1146. }

  1147. 

  1148. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1149. {

  1150.     ff_asf_guid g;

  1151.     ASFContext *asf = s->priv_data;

  1152.     int64_t current_pos= url_ftell(s->pb);

  1153.     int i;

  1154. 

  1155.     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);

  1156.     ff_get_guid(s->pb, &g);

  1157. 

  1158.     /* the data object can be followed by other top-level objects,

  1159.        skip them until the simple index object is reached */

  1160.     while (ff_guidcmp(&g, &index_guid)) {

  1161.         int64_t gsize= get_le64(s->pb);

  1162.         if (gsize < 24 || url_feof(s->pb)) {

  1163.             url_fseek(s->pb, current_pos, SEEK_SET);

  1164.             return;

  1165.         }

  1166.         url_fseek(s->pb, gsize-24, SEEK_CUR);

  1167.         ff_get_guid(s->pb, &g);

  1168.     }

  1169. 

  1170.     {

  1171.         int64_t itime, last_pos=-1;

  1172.         int pct, ict;

  1173.         int64_t av_unused gsize= get_le64(s->pb);

  1174.         ff_get_guid(s->pb, &g);

  1175.         itime=get_le64(s->pb);

  1176.         pct=get_le32(s->pb);

  1177.         ict=get_le32(s->pb);

  1178.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1179. 

  1180.         for (i=0;i<ict;i++){

  1181.             int pktnum=get_le32(s->pb);

  1182.             int pktct =get_le16(s->pb);

  1183.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1184.             int64_t index_pts= av_rescale(itime, i, 10000);

  1185. 

  1186.             if(pos != last_pos){

  1187.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);

  1188.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1189.             last_pos=pos;

  1190.             }

  1191.         }

  1192.         asf->index_read= 1;

  1193.     }

  1194.     url_fseek(s->pb, current_pos, SEEK_SET);

  1195. }

  1196. 

  1197. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1198. {

  1199.     ASFContext *asf = s->priv_data;

  1200.     AVStream *st = s->streams[stream_index];

  1201.     int64_t pos;

  1202.     int index;

  1203. 

  1204.     if (s->packet_size <= 0)

  1205.         return -1;

  1206. 

  1207.     /* Try using the protocol's read_seek if available */

  1208.     if(s->pb) {

  1209.         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);

  1210.         if(ret >= 0)

  1211.             asf_reset_header(s);

  1212.         if (ret != AVERROR(ENOSYS))

  1213.             return ret;

  1214.     }

  1215. 

  1216.     if (!asf->index_read)

  1217.         asf_build_simple_index(s, stream_index);

  1218. 

  1219.     if(!(asf->index_read && st->index_entries)){

  1220.         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)

  1221.             return -1;

  1222.     }else{

  1223.         index= av_index_search_timestamp(st, pts, flags);

  1224.         if(index<0)

  1225.             return -1;

  1226. 

  1227.         /* find the position */

  1228.         pos = st->index_entries[index].pos;

  1229. 

  1230.     // various attempts to find key frame have failed so far

  1231.     //    asf_reset_header(s);

  1232.     //    url_fseek(s->pb, pos, SEEK_SET);

  1233.     //    key_pos = pos;

  1234.     //     for(i=0;i<16;i++){

  1235.     //         pos = url_ftell(s->pb);

  1236.     //         if (av_read_frame(s, &pkt) < 0){

  1237.     //             av_log(s, AV_LOG_INFO, "seek failed\n");

  1238.     //             return -1;

  1239.     //         }

  1240.     //         asf_st = s->streams[stream_index]->priv_data;

  1241.     //         pos += st->parser->frame_offset;

  1242.     //

  1243.     //         if (pkt.size > b) {

  1244.     //             b = pkt.size;

  1245.     //             key_pos = pos;

  1246.     //         }

  1247.     //

  1248.     //         av_free_packet(&pkt);

  1249.     //     }

  1250. 

  1251.         /* do the seek */

  1252.         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1253.         url_fseek(s->pb, pos, SEEK_SET);

  1254.     }

  1255.     asf_reset_header(s);

  1256.     return 0;

  1257. }

  1258. 

  1259. AVInputFormat asf_demuxer = {

  1260.     "asf",

  1261.     NULL_IF_CONFIG_SMALL("ASF format"),

  1262.     sizeof(ASFContext),

  1263.     asf_probe,

  1264.     asf_read_header,

  1265.     asf_read_packet,

  1266.     asf_read_close,

  1267.     asf_read_seek,

  1268.     asf_read_pts,

  1269. };