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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. typedef struct {

  36.     int asfid2avid[128];                 ///< conversion table from asf ID 2 AVStream ID

  37.     ASFStream streams[128];              ///< it's max number and it's not that big

  38.     uint32_t stream_bitrates[128];       ///< max number of streams, bitrate for each (for streaming)

  39.     AVRational dar[128];

  40.     char stream_languages[128][6];       ///< max number of streams, language for each (RFC1766, e.g. en-US)

  41.     /* non streamed additonnal info */

  42.     /* packet filling */

  43.     int packet_size_left;

  44.     /* only for reading */

  45.     uint64_t data_offset;                ///< beginning of the first data packet

  46.     uint64_t data_object_offset;         ///< data object offset (excl. GUID & size)

  47.     uint64_t data_object_size;           ///< size of the data object

  48.     int index_read;

  49. 

  50.     ASFMainHeader hdr;

  51. 

  52.     int packet_flags;

  53.     int packet_property;

  54.     int packet_timestamp;

  55.     int packet_segsizetype;

  56.     int packet_segments;

  57.     int packet_seq;

  58.     int packet_replic_size;

  59.     int packet_key_frame;

  60.     int packet_padsize;

  61.     unsigned int packet_frag_offset;

  62.     unsigned int packet_frag_size;

  63.     int64_t packet_frag_timestamp;

  64.     int packet_multi_size;

  65.     int packet_obj_size;

  66.     int packet_time_delta;

  67.     int packet_time_start;

  68.     int64_t packet_pos;

  69. 

  70.     int stream_index;

  71. 

  72.     ASFStream* asf_st;                   ///< currently decoded stream

  73. } ASFContext;

  74. 

  75. #undef NDEBUG

  76. #include <assert.h>

  77. 

  78. #define ASF_MAX_STREAMS 127

  79. #define FRAME_HEADER_SIZE 17

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

  81. 

  82. static const ff_asf_guid index_guid = {

  83.     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb

  84. };

  85. 

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

  87.     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2

  88. };

  89. /**********************************/

  90. /* decoding */

  91. 

  92. #ifdef DEBUG

  93. #define PRINT_IF_GUID(g,cmp) \

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

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

  96. 

  97. static void print_guid(const ff_asf_guid *g)

  98. {

  99.     int i;

  100.     PRINT_IF_GUID(g, ff_asf_header);

  101.     else PRINT_IF_GUID(g, ff_asf_file_header);

  102.     else PRINT_IF_GUID(g, ff_asf_stream_header);

  103.     else PRINT_IF_GUID(g, ff_asf_audio_stream);

  104.     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);

  105.     else PRINT_IF_GUID(g, ff_asf_video_stream);

  106.     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);

  107.     else PRINT_IF_GUID(g, ff_asf_command_stream);

  108.     else PRINT_IF_GUID(g, ff_asf_comment_header);

  109.     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);

  110.     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);

  111.     else PRINT_IF_GUID(g, ff_asf_data_header);

  112.     else PRINT_IF_GUID(g, index_guid);

  113.     else PRINT_IF_GUID(g, ff_asf_head1_guid);

  114.     else PRINT_IF_GUID(g, ff_asf_head2_guid);

  115.     else PRINT_IF_GUID(g, ff_asf_my_guid);

  116.     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);

  117.     else PRINT_IF_GUID(g, ff_asf_extended_content_header);

  118.     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);

  119.     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);

  120.     else PRINT_IF_GUID(g, ff_asf_metadata_header);

  121.     else PRINT_IF_GUID(g, ff_asf_marker_header);

  122.     else PRINT_IF_GUID(g, stream_bitrate_guid);

  123.     else PRINT_IF_GUID(g, ff_asf_language_guid);

  124.     else

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

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

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

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

  129. }

  130. #undef PRINT_IF_GUID

  131. #else

  132. #define print_guid(g)

  133. #endif

  134. 

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

  136. {

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

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

  139. }

  140. 

  141. static int asf_probe(AVProbeData *pd)

  142. {

  143.     /* check file header */

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

  145.         return AVPROBE_SCORE_MAX;

  146.     else

  147.         return 0;

  148. }

  149. 

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

  151.     switch(type){

  152.         case 2: return get_le32(pb);

  153.         case 3: return get_le32(pb);

  154.         case 4: return get_le64(pb);

  155.         case 5: return get_le16(pb);

  156.         default:return INT_MIN;

  157.     }

  158. }

  159. 

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

  161. {

  162.     char *value;

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

  164. 

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

  166.         return;

  167. 

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

  169.     if (!value)

  170.         goto finish;

  171. 

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

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

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

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

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

  177.     } else {

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

  179.         goto finish;

  180.     }

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

  182. finish:

  183.     av_freep(&value);

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

  185. }

  186. 

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

  188. {

  189.     ASFContext *asf = s->priv_data;

  190.     ff_asf_guid g;

  191.     ByteIOContext *pb = s->pb;

  192.     AVStream *st;

  193.     ASFStream *asf_st;

  194.     int size, i;

  195.     int64_t gsize;

  196. 

  197.     ff_get_guid(pb, &g);

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

  199.         return -1;

  200.     get_le64(pb);

  201.     get_le32(pb);

  202.     get_byte(pb);

  203.     get_byte(pb);

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

  205.     for(;;) {

  206.         uint64_t gpos= url_ftell(pb);

  207.         int ret;

  208.         ff_get_guid(pb, &g);

  209.         gsize = get_le64(pb);

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

  211.         print_guid(&g);

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

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

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

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

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

  217.                 asf->data_object_size = gsize - 24;

  218.             } else {

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

  220.             }

  221.             break;

  222.         }

  223.         if (gsize < 24)

  224.             return -1;

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

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

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

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

  229.             get_le64(pb);                               /* number of packets */

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

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

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

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

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

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

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

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

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

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

  240.             enum AVMediaType type;

  241.             int type_specific_size, sizeX;

  242.             uint64_t total_size;

  243.             unsigned int tag1;

  244.             int64_t pos1, pos2, start_time;

  245.             int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  246. 

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

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

  249.                 return AVERROR(EINVAL);

  250.             }

  251. 

  252.             pos1 = url_ftell(pb);

  253. 

  254.             st = av_new_stream(s, 0);

  255.             if (!st)

  256.                 return AVERROR(ENOMEM);

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

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

  259.             if (!asf_st)

  260.                 return AVERROR(ENOMEM);

  261.             st->priv_data = asf_st;

  262.             start_time = asf->hdr.preroll;

  263. 

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

  265. 

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

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

  268.                     (10000000 / 1000) - start_time;

  269.             }

  270.             ff_get_guid(pb, &g);

  271. 

  272.             test_for_ext_stream_audio = 0;

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

  274.                 type = AVMEDIA_TYPE_AUDIO;

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

  276.                 type = AVMEDIA_TYPE_VIDEO;

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

  278.                 type = AVMEDIA_TYPE_VIDEO;

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

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

  281.                 type = AVMEDIA_TYPE_DATA;

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

  283.                 test_for_ext_stream_audio = 1;

  284.                 type = AVMEDIA_TYPE_UNKNOWN;

  285.             } else {

  286.                 return -1;

  287.             }

  288.             ff_get_guid(pb, &g);

  289.             total_size = get_le64(pb);

  290.             type_specific_size = get_le32(pb);

  291.             get_le32(pb);

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

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

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

  295. 

  296.             get_le32(pb);

  297. 

  298.             if (test_for_ext_stream_audio) {

  299.                 ff_get_guid(pb, &g);

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

  301.                     type = AVMEDIA_TYPE_AUDIO;

  302.                     is_dvr_ms_audio=1;

  303.                     ff_get_guid(pb, &g);

  304.                     get_le32(pb);

  305.                     get_le32(pb);

  306.                     get_le32(pb);

  307.                     ff_get_guid(pb, &g);

  308.                     get_le32(pb);

  309.                 }

  310.             }

  311. 

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

  313.             if (type == AVMEDIA_TYPE_AUDIO) {

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

  315.                 if (is_dvr_ms_audio) {

  316.                     // codec_id and codec_tag are unreliable in dvr_ms

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

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

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

  320.                 }

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

  322.                     st->need_parsing = AVSTREAM_PARSE_NONE;

  323.                 } else {

  324.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  325.                 }

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

  327.                 pos2 = url_ftell(pb);

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

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

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

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

  332.                     get_le16(pb); //ds_data_size

  333.                     get_byte(pb); //ds_silence_data

  334.                 }

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

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

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

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

  339.                     if (!asf_st->ds_chunk_size

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

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

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

  343.                 }

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

  345.                 case CODEC_ID_MP3:

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

  347.                     break;

  348.                 case CODEC_ID_PCM_S16LE:

  349.                 case CODEC_ID_PCM_S16BE:

  350.                 case CODEC_ID_PCM_U16LE:

  351.                 case CODEC_ID_PCM_U16BE:

  352.                 case CODEC_ID_PCM_S8:

  353.                 case CODEC_ID_PCM_U8:

  354.                 case CODEC_ID_PCM_ALAW:

  355.                 case CODEC_ID_PCM_MULAW:

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

  357.                     break;

  358.                 default:

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

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

  361.                     break;

  362.                 }

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

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

  365.                 get_le32(pb);

  366.                 get_le32(pb);

  367.                 get_byte(pb);

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

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

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

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

  372.                 /* not available for asf */

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

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

  375.                 tag1 = get_le32(pb);

  376.                 url_fskip(pb, 20);

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

  378.                 size= sizeX;

  379.                 if (size > 40) {

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

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

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

  383.                 }

  384. 

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

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

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

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

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

  390. #if HAVE_BIGENDIAN

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

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

  393. #else

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

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

  396. #endif

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

  398.                 }

  399. 

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

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

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

  403.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  404.                     // 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

  405.                     st->codec->width  =

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

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

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

  409.                 }

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

  411.                     st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;

  412.             }

  413.             pos2 = url_ftell(pb);

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

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

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

  417. 

  418.             len1 = get_le16(pb);

  419.             len2 = get_le16(pb);

  420.             len3 = get_le16(pb);

  421.             len4 = get_le16(pb);

  422.             len5 = get_le16(pb);

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

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

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

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

  427.             url_fskip(pb, len5);

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

  429.             int stream_count = get_le16(pb);

  430.             int j;

  431. 

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

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

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

  435.                 int flags, bitrate, stream_id;

  436. 

  437.                 flags= get_le16(pb);

  438.                 bitrate= get_le32(pb);

  439.                 stream_id= (flags & 0x7f);

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

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

  442.             }

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

  444.             int j;

  445.             int stream_count = get_le16(pb);

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

  447.                 char lang[6];

  448.                 unsigned int lang_len = get_byte(pb);

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

  450.                     url_fskip(pb, lang_len - ret);

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

  466.                         url_fskip(pb, name_len - ret);

  467.                     value_type = get_le16(pb);

  468.                     value_len  = get_le16(pb);

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

  470.                         value_len += 1;

  471.                     /**

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

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

  474.                      */

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

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

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

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

  479.                     } else

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

  481.             }

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

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

  484.             n = get_le16(pb);

  485. 

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

  487.                 char name[1024];

  488. 

  489.                 get_le16(pb); //lang_list_index

  490.                 stream_num= get_le16(pb);

  491.                 name_len=   get_le16(pb);

  492.                 value_type= get_le16(pb);

  493.                 value_len=  get_le32(pb);

  494. 

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

  496.                     url_fskip(pb, name_len - ret);

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

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

  499.                 url_fskip(pb, value_len - 2);

  500. 

  501.                 if(stream_num<128){

  502.                     if     (!strcmp(name, "AspectRatioX")) asf->dar[stream_num].num= value_num;

  503.                     else if(!strcmp(name, "AspectRatioY")) asf->dar[stream_num].den= value_num;

  504.                 }

  505.             }

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

  507.             int ext_len, payload_ext_ct, stream_ct;

  508.             uint32_t ext_d, leak_rate, stream_num;

  509.             unsigned int stream_languageid_index;

  510. 

  511.             get_le64(pb); // starttime

  512.             get_le64(pb); // endtime

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

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

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

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

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

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

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

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

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

  522. 

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

  524.             if (stream_num < 128)

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

  526. 

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

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

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

  530. 

  531.             if (stream_num < 128)

  532.                 asf->stream_bitrates[stream_num] = leak_rate;

  533. 

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

  535.                 get_le16(pb);

  536.                 ext_len = get_le16(pb);

  537.                 url_fseek(pb, ext_len, SEEK_CUR);

  538.             }

  539. 

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

  541.                 ff_get_guid(pb, &g);

  542.                 ext_d=get_le16(pb);

  543.                 ext_len=get_le32(pb);

  544.                 url_fseek(pb, ext_len, SEEK_CUR);

  545.             }

  546. 

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

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

  549.             continue;

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

  551.             int v1, v2;

  552.             ff_get_guid(pb, &g);

  553.             v1 = get_le32(pb);

  554.             v2 = get_le16(pb);

  555.             continue;

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

  557.             int i, count, name_len;

  558.             char name[1024];

  559. 

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

  561.             get_le64(pb);            // ...

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

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

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

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

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

  567.             }

  568. 

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

  570.                 int64_t pres_time;

  571.                 int name_len;

  572. 

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

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

  575.                 get_le16(pb);             // entry length

  576.                 get_le32(pb);             // send time

  577.                 get_le32(pb);             // flags

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

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

  580.                     url_fskip(pb, name_len - ret);

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

  582.             }

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

  584.             return -1;

  585.         } else {

  586.             if (!s->keylen) {

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

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

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

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

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

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

  593.                 }

  594.             }

  595.         }

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

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

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

  599.     }

  600.     ff_get_guid(pb, &g);

  601.     get_le64(pb);

  602.     get_byte(pb);

  603.     get_byte(pb);

  604.     if (url_feof(pb))

  605.         return -1;

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

  607.     asf->packet_size_left = 0;

  608. 

  609. 

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

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

  612.         if(stream_num>=0){

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

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

  615.                 st->codec->bit_rate = asf->stream_bitrates[i];

  616.             if (asf->dar[i].num > 0 && asf->dar[i].den > 0){

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

  618.                           &st->sample_aspect_ratio.den,

  619.                           asf->dar[i].num, asf->dar[i].den, INT_MAX);

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

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

  622.                           &st->sample_aspect_ratio.den,

  623.                           asf->dar[0].num, asf->dar[0].den, INT_MAX);

  624. 

  625. //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);

  626. 

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

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

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

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

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

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

  633.                     if (iso6392)

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

  635.                 }

  636.             }

  637.         }

  638.     }

  639. 

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

  641. 

  642.     return 0;

  643. }

  644. 

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

  646.     switch (bits & 3) \

  647.     { \

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

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

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

  651.     default: var = defval; break; \

  652.     }

  653. 

  654. /**

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

  656.  * @param s demux context

  657.  * @param pb context to read data from

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

  659.  */

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

  661. {

  662.     ASFContext *asf = s->priv_data;

  663.     uint32_t packet_length, padsize;

  664.     int rsize = 8;

  665.     int c, d, e, off;

  666. 

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

  668.     off= 32768;

  669.     if (s->packet_size > 0)

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

  671. 

  672.     c=d=e=-1;

  673.     while(off-- > 0){

  674.         c=d; d=e;

  675.         e= get_byte(pb);

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

  677.             break;

  678.     }

  679. 

  680.     if (c != 0x82) {

  681.         /**

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

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

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

  685.          * the stream.

  686.          */

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

  688.             return AVERROR(EAGAIN);

  689.         if (!url_feof(pb))

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

  691.     }

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

  693.         if (d || e) {

  694.             if (!url_feof(pb))

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

  696.             return -1;

  697.         }

  698.         c= get_byte(pb);

  699.         d= get_byte(pb);

  700.         rsize+=3;

  701.     }else{

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

  703.     }

  704. 

  705.     asf->packet_flags    = c;

  706.     asf->packet_property = d;

  707. 

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

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

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

  711. 

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

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

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

  715.         return -1;

  716.     }

  717.     if(padsize >= packet_length){

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

  719.         return -1;

  720.     }

  721. 

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

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

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

  725. 

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

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

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

  729.     } else {

  730.         asf->packet_segments = 1;

  731.         asf->packet_segsizetype = 0x80;

  732.     }

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

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

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

  736.     asf->packet_padsize = padsize;

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

  738.     return 0;

  739. }

  740. 

  741. /**

  742.  *

  743.  * @return <0 if error

  744.  */

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

  746.     ASFContext *asf = s->priv_data;

  747.     int rsize = 1;

  748.     int num = get_byte(pb);

  749.     int64_t ts0, ts1;

  750. 

  751.     asf->packet_segments--;

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

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

  754.     // sequence should be ignored!

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

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

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

  758. //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);

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

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

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

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

  763.             return -1;

  764.         }

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

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

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

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

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

  770.             url_fskip(pb, 10);

  771.             ts0= get_le64(pb);

  772.             ts1= get_le64(pb);

  773.             url_fskip(pb, 12);

  774.             get_le32(pb);

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

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

  777.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  778.         }else

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

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

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

  782.         // multipacket - frag_offset is beginning timestamp

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

  784.         asf->packet_frag_offset = 0;

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

  786. 

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

  788.         rsize++;

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

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

  791.         return -1;

  792.     }

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

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

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

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

  797.             return -1;

  798.         }

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

  800.     } else {

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

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

  803.     }

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

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

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

  807.             return -1;

  808.     }

  809.     asf->packet_size_left -= rsize;

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

  811. 

  812.     return 0;

  813. }

  814. 

  815. /**

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

  817.  * with asf_get_packet()).

  818.  * @param s demux context

  819.  * @param pb context to read data from

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

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

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

  823.  */

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

  825. {

  826.     ASFContext *asf = s->priv_data;

  827.     ASFStream *asf_st = 0;

  828.     for (;;) {

  829.         int ret;

  830.         if(url_feof(pb))

  831.             return AVERROR_EOF;

  832.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  837.             assert(ret>=0);

  838.             /* fail safe */

  839.             url_fskip(pb, ret);

  840. 

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

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

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

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

  845.             return 1;

  846.         }

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

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

  849.                 asf->packet_segments= 0;

  850.                 continue;

  851.             }

  852.             if (asf->stream_index < 0

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

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

  855.                 ) {

  856.                 asf->packet_time_start = 0;

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

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

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

  860.                 if(asf->stream_index < 0)

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

  862.                 continue;

  863.             }

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

  865.         }

  866.         asf_st = asf->asf_st;

  867. 

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

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

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

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

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

  873.             asf->packet_size_left--;

  874.             asf->packet_multi_size--;

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

  876.             {

  877.                 asf->packet_time_start = 0;

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

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

  880.                 continue;

  881.             }

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

  883.             //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);

  884.         }

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

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

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

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

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

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

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

  892.         }

  893. 

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

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

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

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

  898.                 asf_st->frag_offset = 0;

  899.                 av_free_packet(&asf_st->pkt);

  900.             }

  901.             /* new packet */

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

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

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

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

  906.             asf_st->pkt.pos =

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

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

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

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

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

  912.                 asf->packet_key_frame = 1;

  913.             if (asf->packet_key_frame)

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

  915.         }

  916. 

  917.         /* read data */

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

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

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

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

  922.         if (asf->packet_size_left < 0)

  923.             continue;

  924. 

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

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

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

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

  929.             continue;

  930.         }

  931. 

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

  933.                          asf->packet_frag_size);

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

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

  936.                 return ret < 0 ? ret : AVERROR_EOF;

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

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

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

  940.                 // fragment?

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

  942.                        asf->packet_frag_size - ret);

  943.                 ret = asf->packet_frag_size;

  944.             } else

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

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

  947.         }

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

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

  950.                             ret);

  951.         asf_st->frag_offset += ret;

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

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

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

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

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

  957.                 int i;

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

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

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

  961.                     asf_st->frag_offset = 0;

  962.                     av_free_packet(&asf_st->pkt);

  963.                     continue;

  964.                 }

  965.             }

  966. 

  967.             /* return packet */

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

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

  970.                     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);

  971.               }else{

  972.                 /* packet descrambling */

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

  974.                 if (newdata) {

  975.                     int offset = 0;

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

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

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

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

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

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

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

  983. 

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

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

  986.                         memcpy(newdata + offset,

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

  988.                                asf_st->ds_chunk_size);

  989.                         offset += asf_st->ds_chunk_size;

  990.                     }

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

  992.                     asf_st->pkt.data = newdata;

  993.                 }

  994.               }

  995.             }

  996.             asf_st->frag_offset = 0;

  997.             *pkt= asf_st->pkt;

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

  999.             asf_st->pkt.size = 0;

  1000.             asf_st->pkt.data = 0;

  1001.             break; // packet completed

  1002.         }

  1003.     }

  1004.     return 0;

  1005. }

  1006. 

  1007. static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)

  1008. {

  1009.     ASFContext *asf = s->priv_data;

  1010. 

  1011.     for (;;) {

  1012.         int ret;

  1013. 

  1014.         /* parse cached packets, if any */

  1015.         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)

  1016.             return ret;

  1017.         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)

  1018.             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);

  1019.         asf->packet_time_start = 0;

  1020.     }

  1021. 

  1022.     return 0;

  1023. }

  1024. 

  1025. // Added to support seeking after packets have been read

  1026. // If information is not reset, read_packet fails due to

  1027. // leftover information from previous reads

  1028. static void asf_reset_header(AVFormatContext *s)

  1029. {

  1030.     ASFContext *asf = s->priv_data;

  1031.     ASFStream *asf_st;

  1032.     int i;

  1033. 

  1034.     asf->packet_size_left = 0;

  1035.     asf->packet_segments = 0;

  1036.     asf->packet_flags = 0;

  1037.     asf->packet_property = 0;

  1038.     asf->packet_timestamp = 0;

  1039.     asf->packet_segsizetype = 0;

  1040.     asf->packet_segments = 0;

  1041.     asf->packet_seq = 0;

  1042.     asf->packet_replic_size = 0;

  1043.     asf->packet_key_frame = 0;

  1044.     asf->packet_padsize = 0;

  1045.     asf->packet_frag_offset = 0;

  1046.     asf->packet_frag_size = 0;

  1047.     asf->packet_frag_timestamp = 0;

  1048.     asf->packet_multi_size = 0;

  1049.     asf->packet_obj_size = 0;

  1050.     asf->packet_time_delta = 0;

  1051.     asf->packet_time_start = 0;

  1052. 

  1053.     for(i=0; i<s->nb_streams; i++){

  1054.         asf_st= s->streams[i]->priv_data;

  1055.         av_free_packet(&asf_st->pkt);

  1056.         asf_st->frag_offset=0;

  1057.         asf_st->seq=0;

  1058.     }

  1059.     asf->asf_st= NULL;

  1060. }

  1061. 

  1062. static int asf_read_close(AVFormatContext *s)

  1063. {

  1064.     int i;

  1065. 

  1066.     asf_reset_header(s);

  1067.     for(i=0;i<s->nb_streams;i++) {

  1068.         AVStream *st = s->streams[i];

  1069.         av_free(st->codec->palctrl);

  1070.     }

  1071.     return 0;

  1072. }

  1073. 

  1074. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  1075. {

  1076.     AVPacket pkt1, *pkt = &pkt1;

  1077.     ASFStream *asf_st;

  1078.     int64_t pts;

  1079.     int64_t pos= *ppos;

  1080.     int i;

  1081.     int64_t start_pos[ASF_MAX_STREAMS];

  1082. 

  1083.     for(i=0; i<s->nb_streams; i++){

  1084.         start_pos[i]= pos;

  1085.     }

  1086. 

  1087.     if (s->packet_size > 0)

  1088.         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;

  1089.     *ppos= pos;

  1090.     url_fseek(s->pb, pos, SEEK_SET);

  1091. 

  1092. //printf("asf_read_pts\n");

  1093.     asf_reset_header(s);

  1094.     for(;;){

  1095.         if (av_read_frame(s, pkt) < 0){

  1096.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1097.             return AV_NOPTS_VALUE;

  1098.         }

  1099. 

  1100.         pts= pkt->pts;

  1101. 

  1102.         av_free_packet(pkt);

  1103.         if(pkt->flags&AV_PKT_FLAG_KEY){

  1104.             i= pkt->stream_index;

  1105. 

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

  1107. 

  1108. //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);

  1109.             pos= asf_st->packet_pos;

  1110. 

  1111.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1112.             start_pos[i]= asf_st->packet_pos + 1;

  1113. 

  1114.             if(pkt->stream_index == stream_index)

  1115.                break;

  1116.         }

  1117.     }

  1118. 

  1119.     *ppos= pos;

  1120. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1121. 

  1122.     return pts;

  1123. }

  1124. 

  1125. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1126. {

  1127.     ff_asf_guid g;

  1128.     ASFContext *asf = s->priv_data;

  1129.     int64_t current_pos= url_ftell(s->pb);

  1130.     int i;

  1131. 

  1132.     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);

  1133.     ff_get_guid(s->pb, &g);

  1134. 

  1135.     /* the data object can be followed by other top-level objects,

  1136.        skip them until the simple index object is reached */

  1137.     while (ff_guidcmp(&g, &index_guid)) {

  1138.         int64_t gsize= get_le64(s->pb);

  1139.         if (gsize < 24 || url_feof(s->pb)) {

  1140.             url_fseek(s->pb, current_pos, SEEK_SET);

  1141.             return;

  1142.         }

  1143.         url_fseek(s->pb, gsize-24, SEEK_CUR);

  1144.         ff_get_guid(s->pb, &g);

  1145.     }

  1146. 

  1147.     {

  1148.         int64_t itime, last_pos=-1;

  1149.         int pct, ict;

  1150.         int64_t av_unused gsize= get_le64(s->pb);

  1151.         ff_get_guid(s->pb, &g);

  1152.         itime=get_le64(s->pb);

  1153.         pct=get_le32(s->pb);

  1154.         ict=get_le32(s->pb);

  1155.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1156. 

  1157.         for (i=0;i<ict;i++){

  1158.             int pktnum=get_le32(s->pb);

  1159.             int pktct =get_le16(s->pb);

  1160.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1161.             int64_t index_pts= av_rescale(itime, i, 10000);

  1162. 

  1163.             if(pos != last_pos){

  1164.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);

  1165.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1166.             last_pos=pos;

  1167.             }

  1168.         }

  1169.         asf->index_read= 1;

  1170.     }

  1171.     url_fseek(s->pb, current_pos, SEEK_SET);

  1172. }

  1173. 

  1174. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1175. {

  1176.     ASFContext *asf = s->priv_data;

  1177.     AVStream *st = s->streams[stream_index];

  1178.     int64_t pos;

  1179.     int index;

  1180. 

  1181.     if (s->packet_size <= 0)

  1182.         return -1;

  1183. 

  1184.     /* Try using the protocol's read_seek if available */

  1185.     if(s->pb) {

  1186.         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);

  1187.         if(ret >= 0)

  1188.             asf_reset_header(s);

  1189.         if (ret != AVERROR(ENOSYS))

  1190.             return ret;

  1191.     }

  1192. 

  1193.     if (!asf->index_read)

  1194.         asf_build_simple_index(s, stream_index);

  1195. 

  1196.     if(!(asf->index_read && st->index_entries)){

  1197.         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)

  1198.             return -1;

  1199.     }else{

  1200.         index= av_index_search_timestamp(st, pts, flags);

  1201.         if(index<0)

  1202.             return -1;

  1203. 

  1204.         /* find the position */

  1205.         pos = st->index_entries[index].pos;

  1206. 

  1207.     // various attempts to find key frame have failed so far

  1208.     //    asf_reset_header(s);

  1209.     //    url_fseek(s->pb, pos, SEEK_SET);

  1210.     //    key_pos = pos;

  1211.     //     for(i=0;i<16;i++){

  1212.     //         pos = url_ftell(s->pb);

  1213.     //         if (av_read_frame(s, &pkt) < 0){

  1214.     //             av_log(s, AV_LOG_INFO, "seek failed\n");

  1215.     //             return -1;

  1216.     //         }

  1217.     //         asf_st = s->streams[stream_index]->priv_data;

  1218.     //         pos += st->parser->frame_offset;

  1219.     //

  1220.     //         if (pkt.size > b) {

  1221.     //             b = pkt.size;

  1222.     //             key_pos = pos;

  1223.     //         }

  1224.     //

  1225.     //         av_free_packet(&pkt);

  1226.     //     }

  1227. 

  1228.         /* do the seek */

  1229.         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1230.         url_fseek(s->pb, pos, SEEK_SET);

  1231.     }

  1232.     asf_reset_header(s);

  1233.     return 0;

  1234. }

  1235. 

  1236. AVInputFormat ff_asf_demuxer = {

  1237.     "asf",

  1238.     NULL_IF_CONFIG_SMALL("ASF format"),

  1239.     sizeof(ASFContext),

  1240.     asf_probe,

  1241.     asf_read_header,

  1242.     asf_read_packet,

  1243.     asf_read_close,

  1244.     asf_read_seek,

  1245.     asf_read_pts,

  1246. };