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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/bswap.h"

  25. #include "libavutil/common.h"

  26. #include "libavutil/avstring.h"

  27. #include "libavutil/dict.h"

  28. #include "libavutil/mathematics.h"

  29. #include "libavutil/opt.h"

  30. #include "avformat.h"

  31. #include "internal.h"

  32. #include "avio_internal.h"

  33. #include "riff.h"

  34. #include "asf.h"

  35. #include "asfcrypt.h"

  36. #include "avlanguage.h"

  37. 

  38. typedef struct {

  39.     const AVClass *class;

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

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

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

  43.     AVRational dar[128];

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

  45.     /* non streamed additonnal info */

  46.     /* packet filling */

  47.     int packet_size_left;

  48.     /* only for reading */

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

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

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

  52.     int index_read;

  53. 

  54.     ASFMainHeader hdr;

  55. 

  56.     int packet_flags;

  57.     int packet_property;

  58.     int packet_timestamp;

  59.     int packet_segsizetype;

  60.     int packet_segments;

  61.     int packet_seq;

  62.     int packet_replic_size;

  63.     int packet_key_frame;

  64.     int packet_padsize;

  65.     unsigned int packet_frag_offset;

  66.     unsigned int packet_frag_size;

  67.     int64_t packet_frag_timestamp;

  68.     int packet_multi_size;

  69.     int packet_obj_size;

  70.     int packet_time_delta;

  71.     int packet_time_start;

  72.     int64_t packet_pos;

  73. 

  74.     int stream_index;

  75. 

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

  77. 

  78.     int no_resync_search;

  79. } ASFContext;

  80. 

  81. static const AVOption options[] = {

  82.     {"no_resync_search", "Don't try to resynchronize by looking for a certain optional start code", offsetof(ASFContext, no_resync_search), AV_OPT_TYPE_INT, {.dbl = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },

  83.     { NULL },

  84. };

  85. 

  86. static const AVClass asf_class = {

  87.     .class_name = "asf demuxer",

  88.     .item_name  = av_default_item_name,

  89.     .option     = options,

  90.     .version    = LIBAVUTIL_VERSION_INT,

  91. };

  92. 

  93. #undef NDEBUG

  94. #include <assert.h>

  95. 

  96. #define ASF_MAX_STREAMS 127

  97. #define FRAME_HEADER_SIZE 17

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

  99. 

  100. #ifdef DEBUG

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

  102.     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2

  103. };

  104. 

  105. #define PRINT_IF_GUID(g,cmp) \

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

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

  108. 

  109. static void print_guid(const ff_asf_guid *g)

  110. {

  111.     int i;

  112.     PRINT_IF_GUID(g, ff_asf_header);

  113.     else PRINT_IF_GUID(g, ff_asf_file_header);

  114.     else PRINT_IF_GUID(g, ff_asf_stream_header);

  115.     else PRINT_IF_GUID(g, ff_asf_audio_stream);

  116.     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);

  117.     else PRINT_IF_GUID(g, ff_asf_video_stream);

  118.     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);

  119.     else PRINT_IF_GUID(g, ff_asf_command_stream);

  120.     else PRINT_IF_GUID(g, ff_asf_comment_header);

  121.     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);

  122.     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);

  123.     else PRINT_IF_GUID(g, ff_asf_data_header);

  124.     else PRINT_IF_GUID(g, ff_asf_simple_index_header);

  125.     else PRINT_IF_GUID(g, ff_asf_head1_guid);

  126.     else PRINT_IF_GUID(g, ff_asf_head2_guid);

  127.     else PRINT_IF_GUID(g, ff_asf_my_guid);

  128.     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);

  129.     else PRINT_IF_GUID(g, ff_asf_extended_content_header);

  130.     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);

  131.     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);

  132.     else PRINT_IF_GUID(g, ff_asf_metadata_header);

  133.     else PRINT_IF_GUID(g, ff_asf_marker_header);

  134.     else PRINT_IF_GUID(g, stream_bitrate_guid);

  135.     else PRINT_IF_GUID(g, ff_asf_language_guid);

  136.     else

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

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

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

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

  141. }

  142. #undef PRINT_IF_GUID

  143. #else

  144. #define print_guid(g)

  145. #endif

  146. 

  147. static int asf_probe(AVProbeData *pd)

  148. {

  149.     /* check file header */

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

  151.         return AVPROBE_SCORE_MAX;

  152.     else

  153.         return 0;

  154. }

  155. 

  156. static int get_value(AVIOContext *pb, int type){

  157.     switch(type){

  158.         case 2: return avio_rl32(pb);

  159.         case 3: return avio_rl32(pb);

  160.         case 4: return avio_rl64(pb);

  161.         case 5: return avio_rl16(pb);

  162.         default:return INT_MIN;

  163.     }

  164. }

  165. 

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

  167. {

  168.     char *value;

  169.     int64_t off = avio_tell(s->pb);

  170. 

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

  172.         return;

  173. 

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

  175.     if (!value)

  176.         goto finish;

  177. 

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

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

  180.     } else if (type == -1) { // ASCII

  181.         avio_read(s->pb, value, len);

  182.         value[len]=0;

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

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

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

  186.     } else {

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

  188.         goto finish;

  189.     }

  190.     if (*value)

  191.         av_dict_set(&s->metadata, key, value, 0);

  192. finish:

  193.     av_freep(&value);

  194.     avio_seek(s->pb, off + len, SEEK_SET);

  195. }

  196. 

  197. static int asf_read_file_properties(AVFormatContext *s, int64_t size)

  198. {

  199.     ASFContext *asf = s->priv_data;

  200.     AVIOContext *pb = s->pb;

  201. 

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

  203.     asf->hdr.file_size          = avio_rl64(pb);

  204.     asf->hdr.create_time        = avio_rl64(pb);

  205.     avio_rl64(pb);                               /* number of packets */

  206.     asf->hdr.play_time          = avio_rl64(pb);

  207.     asf->hdr.send_time          = avio_rl64(pb);

  208.     asf->hdr.preroll            = avio_rl32(pb);

  209.     asf->hdr.ignore             = avio_rl32(pb);

  210.     asf->hdr.flags              = avio_rl32(pb);

  211.     asf->hdr.min_pktsize        = avio_rl32(pb);

  212.     asf->hdr.max_pktsize        = avio_rl32(pb);

  213.     if (asf->hdr.min_pktsize >= (1U<<29))

  214.         return AVERROR_INVALIDDATA;

  215.     asf->hdr.max_bitrate        = avio_rl32(pb);

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

  217. 

  218.     return 0;

  219. }

  220. 

  221. static int asf_read_stream_properties(AVFormatContext *s, int64_t size)

  222. {

  223.     ASFContext *asf = s->priv_data;

  224.     AVIOContext *pb = s->pb;

  225.     AVStream *st;

  226.     ASFStream *asf_st;

  227.     ff_asf_guid g;

  228.     enum AVMediaType type;

  229.     int type_specific_size, sizeX;

  230.     unsigned int tag1;

  231.     int64_t pos1, pos2, start_time;

  232.     int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  233. 

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

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

  236.         return AVERROR(EINVAL);

  237.     }

  238. 

  239.     pos1 = avio_tell(pb);

  240. 

  241.     st = avformat_new_stream(s, NULL);

  242.     if (!st)

  243.         return AVERROR(ENOMEM);

  244.     avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */

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

  246.     if (!asf_st)

  247.         return AVERROR(ENOMEM);

  248.     st->priv_data = asf_st;

  249.     start_time = asf->hdr.preroll;

  250. 

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

  252. 

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

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

  255.             (10000000 / 1000) - start_time;

  256.     }

  257.     ff_get_guid(pb, &g);

  258. 

  259.     test_for_ext_stream_audio = 0;

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

  261.         type = AVMEDIA_TYPE_AUDIO;

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

  263.         type = AVMEDIA_TYPE_VIDEO;

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

  265.         type = AVMEDIA_TYPE_VIDEO;

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

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

  268.         type = AVMEDIA_TYPE_DATA;

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

  270.         test_for_ext_stream_audio = 1;

  271.         type = AVMEDIA_TYPE_UNKNOWN;

  272.     } else {

  273.         return -1;

  274.     }

  275.     ff_get_guid(pb, &g);

  276.     avio_skip(pb, 8); /* total_size */

  277.     type_specific_size = avio_rl32(pb);

  278.     avio_rl32(pb);

  279.     st->id = avio_rl16(pb) & 0x7f; /* stream id */

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

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

  282. 

  283.     avio_rl32(pb);

  284. 

  285.     if (test_for_ext_stream_audio) {

  286.         ff_get_guid(pb, &g);

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

  288.             type = AVMEDIA_TYPE_AUDIO;

  289.             is_dvr_ms_audio=1;

  290.             ff_get_guid(pb, &g);

  291.             avio_rl32(pb);

  292.             avio_rl32(pb);

  293.             avio_rl32(pb);

  294.             ff_get_guid(pb, &g);

  295.             avio_rl32(pb);

  296.         }

  297.     }

  298. 

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

  300.     if (type == AVMEDIA_TYPE_AUDIO) {

  301.         int ret = ff_get_wav_header(pb, st->codec, type_specific_size);

  302.         if (ret < 0)

  303.             return ret;

  304.         if (is_dvr_ms_audio) {

  305.             // codec_id and codec_tag are unreliable in dvr_ms

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

  307.             st->request_probe= 1;

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

  309.         }

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

  311.             st->need_parsing = AVSTREAM_PARSE_NONE;

  312.         } else {

  313.             st->need_parsing = AVSTREAM_PARSE_FULL;

  314.         }

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

  316.         pos2 = avio_tell(pb);

  317.         if (size >= (pos2 + 8 - pos1 + 24)) {

  318.             asf_st->ds_span = avio_r8(pb);

  319.             asf_st->ds_packet_size = avio_rl16(pb);

  320.             asf_st->ds_chunk_size = avio_rl16(pb);

  321.             avio_rl16(pb); //ds_data_size

  322.             avio_r8(pb);   //ds_silence_data

  323.         }

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

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

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

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

  328.             if (!asf_st->ds_chunk_size

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

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

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

  332.         }

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

  334.             size - (avio_tell(pb) - pos1 + 24) >= 51) {

  335.         avio_rl32(pb);

  336.         avio_rl32(pb);

  337.         avio_r8(pb);

  338.         avio_rl16(pb);        /* size */

  339.         sizeX= avio_rl32(pb); /* size */

  340.         st->codec->width = avio_rl32(pb);

  341.         st->codec->height = avio_rl32(pb);

  342.         /* not available for asf */

  343.         avio_rl16(pb); /* panes */

  344.         st->codec->bits_per_coded_sample = avio_rl16(pb); /* depth */

  345.         tag1 = avio_rl32(pb);

  346.         avio_skip(pb, 20);

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

  348.         if (sizeX > 40) {

  349.             st->codec->extradata_size = sizeX - 40;

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

  351.             avio_read(pb, st->codec->extradata, st->codec->extradata_size);

  352.         }

  353. 

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

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

  356.         /* This is true for all paletted codecs implemented in libavcodec */

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

  358. #if HAVE_BIGENDIAN

  359.             int i;

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

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

  362. #else

  363.             memcpy(asf_st->palette, st->codec->extradata,

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

  365. #endif

  366.             asf_st->palette_changed = 1;

  367.         }

  368. 

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

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

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

  372.             st->need_parsing = AVSTREAM_PARSE_FULL;

  373.             // 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

  374.             st->codec->width  =

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

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

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

  378.         }

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

  380.             st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;

  381.     }

  382.     pos2 = avio_tell(pb);

  383.     avio_skip(pb, size - (pos2 - pos1 + 24));

  384. 

  385.     return 0;

  386. }

  387. 

  388. static int asf_read_ext_stream_properties(AVFormatContext *s, int64_t size)

  389. {

  390.     ASFContext *asf = s->priv_data;

  391.     AVIOContext *pb = s->pb;

  392.     ff_asf_guid g;

  393.     int ext_len, payload_ext_ct, stream_ct, i;

  394.     uint32_t leak_rate, stream_num;

  395.     unsigned int stream_languageid_index;

  396. 

  397.     avio_rl64(pb); // starttime

  398.     avio_rl64(pb); // endtime

  399.     leak_rate = avio_rl32(pb); // leak-datarate

  400.     avio_rl32(pb); // bucket-datasize

  401.     avio_rl32(pb); // init-bucket-fullness

  402.     avio_rl32(pb); // alt-leak-datarate

  403.     avio_rl32(pb); // alt-bucket-datasize

  404.     avio_rl32(pb); // alt-init-bucket-fullness

  405.     avio_rl32(pb); // max-object-size

  406.     avio_rl32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)

  407.     stream_num = avio_rl16(pb); // stream-num

  408. 

  409.     stream_languageid_index = avio_rl16(pb); // stream-language-id-index

  410.     if (stream_num < 128)

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

  412. 

  413.     avio_rl64(pb); // avg frametime in 100ns units

  414.     stream_ct = avio_rl16(pb); //stream-name-count

  415.     payload_ext_ct = avio_rl16(pb); //payload-extension-system-count

  416. 

  417.     if (stream_num < 128)

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

  419. 

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

  421.         avio_rl16(pb);

  422.         ext_len = avio_rl16(pb);

  423.         avio_skip(pb, ext_len);

  424.     }

  425. 

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

  427.         ff_get_guid(pb, &g);

  428.         avio_skip(pb, 2);

  429.         ext_len=avio_rl32(pb);

  430.         avio_skip(pb, ext_len);

  431.     }

  432. 

  433.     return 0;

  434. }

  435. 

  436. static int asf_read_content_desc(AVFormatContext *s, int64_t size)

  437. {

  438.     AVIOContext *pb = s->pb;

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

  440. 

  441.     len1 = avio_rl16(pb);

  442.     len2 = avio_rl16(pb);

  443.     len3 = avio_rl16(pb);

  444.     len4 = avio_rl16(pb);

  445.     len5 = avio_rl16(pb);

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

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

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

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

  450.     avio_skip(pb, len5);

  451. 

  452.     return 0;

  453. }

  454. 

  455. static int asf_read_ext_content_desc(AVFormatContext *s, int64_t size)

  456. {

  457.     AVIOContext *pb = s->pb;

  458.     ASFContext *asf = s->priv_data;

  459.     int desc_count, i, ret;

  460. 

  461.     desc_count = avio_rl16(pb);

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

  463.         int name_len,value_type,value_len;

  464.         char name[1024];

  465. 

  466.         name_len = avio_rl16(pb);

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

  468.             name_len += 1;

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

  470.             avio_skip(pb, name_len - ret);

  471.         value_type = avio_rl16(pb);

  472.         value_len  = avio_rl16(pb);

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

  474.             value_len += 1;

  475.         /**

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

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

  478.          */

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

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

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

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

  483.         } else

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

  485.     }

  486. 

  487.     return 0;

  488. }

  489. 

  490. static int asf_read_language_list(AVFormatContext *s, int64_t size)

  491. {

  492.     AVIOContext *pb = s->pb;

  493.     ASFContext *asf = s->priv_data;

  494.     int j, ret;

  495.     int stream_count = avio_rl16(pb);

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

  497.         char lang[6];

  498.         unsigned int lang_len = avio_r8(pb);

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

  500.             avio_skip(pb, lang_len - ret);

  501.         if (j < 128)

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

  503.     }

  504. 

  505.     return 0;

  506. }

  507. 

  508. static int asf_read_metadata(AVFormatContext *s, int64_t size)

  509. {

  510.     AVIOContext *pb = s->pb;

  511.     ASFContext *asf = s->priv_data;

  512.     int n, stream_num, name_len, value_len, value_num;

  513.     int ret, i;

  514.     n = avio_rl16(pb);

  515. 

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

  517.         char name[1024];

  518. 

  519.         avio_rl16(pb); //lang_list_index

  520.         stream_num= avio_rl16(pb);

  521.         name_len=   avio_rl16(pb);

  522.         avio_skip(pb, 2); /* value_type */

  523.         value_len=  avio_rl32(pb);

  524. 

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

  526.             avio_skip(pb, name_len - ret);

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

  528.         value_num= avio_rl16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere

  529.         avio_skip(pb, value_len - 2);

  530. 

  531.         if(stream_num<128){

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

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

  534.         }

  535.     }

  536. 

  537.     return 0;

  538. }

  539. 

  540. static int asf_read_marker(AVFormatContext *s, int64_t size)

  541. {

  542.     AVIOContext *pb = s->pb;

  543.     int i, count, name_len, ret;

  544.     char name[1024];

  545. 

  546.     avio_rl64(pb);            // reserved 16 bytes

  547.     avio_rl64(pb);            // ...

  548.     count = avio_rl32(pb);    // markers count

  549.     avio_rl16(pb);            // reserved 2 bytes

  550.     name_len = avio_rl16(pb); // name length

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

  552.         avio_r8(pb); // skip the name

  553.     }

  554. 

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

  556.         int64_t pres_time;

  557.         int name_len;

  558. 

  559.         avio_rl64(pb);             // offset, 8 bytes

  560.         pres_time = avio_rl64(pb); // presentation time

  561.         avio_rl16(pb);             // entry length

  562.         avio_rl32(pb);             // send time

  563.         avio_rl32(pb);             // flags

  564.         name_len = avio_rl32(pb);  // name length

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

  566.             avio_skip(pb, name_len - ret);

  567.         avpriv_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );

  568.     }

  569. 

  570.     return 0;

  571. }

  572. 

  573. static int asf_read_header(AVFormatContext *s)

  574. {

  575.     ASFContext *asf = s->priv_data;

  576.     ff_asf_guid g;

  577.     AVIOContext *pb = s->pb;

  578.     int i;

  579.     int64_t gsize;

  580. 

  581.     ff_get_guid(pb, &g);

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

  583.         return -1;

  584.     avio_rl64(pb);

  585.     avio_rl32(pb);

  586.     avio_r8(pb);

  587.     avio_r8(pb);

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

  589.     for(;;) {

  590.         uint64_t gpos= avio_tell(pb);

  591.         ff_get_guid(pb, &g);

  592.         gsize = avio_rl64(pb);

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

  594.         print_guid(&g);

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

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

  597.             asf->data_object_offset = avio_tell(pb);

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

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

  600.                 asf->data_object_size = gsize - 24;

  601.             } else {

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

  603.             }

  604.             break;

  605.         }

  606.         if (gsize < 24)

  607.             return -1;

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

  609.             int ret = asf_read_file_properties(s, gsize);

  610.             if (ret < 0)

  611.                 return ret;

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

  613.             asf_read_stream_properties(s, gsize);

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

  615.             asf_read_content_desc(s, gsize);

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

  617.             asf_read_language_list(s, gsize);

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

  619.             asf_read_ext_content_desc(s, gsize);

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

  621.             asf_read_metadata(s, gsize);

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

  623.             asf_read_ext_stream_properties(s, gsize);

  624. 

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

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

  627.             continue;

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

  629.             ff_get_guid(pb, &g);

  630.             avio_skip(pb, 6);

  631.             continue;

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

  633.             asf_read_marker(s, gsize);

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

  635.             return -1;

  636.         } else {

  637.             if (!s->keylen) {

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

  639.                     unsigned int len;

  640.                     AVPacket pkt;

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

  642.                     len= avio_rl32(pb);

  643.                     av_log(s, AV_LOG_DEBUG, "Secret data:\n");

  644.                     av_get_packet(pb, &pkt, len); av_hex_dump_log(s, AV_LOG_DEBUG, pkt.data, pkt.size); av_free_packet(&pkt);

  645.                     len= avio_rl32(pb);

  646.                     get_tag(s, "ASF_Protection_Type", -1, len);

  647.                     len= avio_rl32(pb);

  648.                     get_tag(s, "ASF_Key_ID", -1, len);

  649.                     len= avio_rl32(pb);

  650.                     get_tag(s, "ASF_License_URL", -1, len);

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

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

  653.                     av_dict_set(&s->metadata, "encryption", "ASF Extended Content Encryption", 0);

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

  655.                     av_log(s, AV_LOG_INFO, "Digital signature detected!\n");

  656.                 }

  657.             }

  658.         }

  659.         if(avio_tell(pb) != gpos + gsize)

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

  661.         avio_seek(pb, gpos + gsize, SEEK_SET);

  662.     }

  663.     ff_get_guid(pb, &g);

  664.     avio_rl64(pb);

  665.     avio_r8(pb);

  666.     avio_r8(pb);

  667.     if (url_feof(pb))

  668.         return -1;

  669.     asf->data_offset = avio_tell(pb);

  670.     asf->packet_size_left = 0;

  671. 

  672. 

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

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

  675.         if(stream_num>=0){

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

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

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

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

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

  681.                           &st->sample_aspect_ratio.den,

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

  683.             } 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.

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

  685.                           &st->sample_aspect_ratio.den,

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

  687. 

  688. //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);

  689. 

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

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

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

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

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

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

  696.                     if (iso6392)

  697.                         av_dict_set(&st->metadata, "language", iso6392, 0);

  698.                 }

  699.             }

  700.         }

  701.     }

  702. 

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

  704. 

  705.     return 0;

  706. }

  707. 

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

  709.     switch (bits & 3) \

  710.     { \

  711.     case 3: var = avio_rl32(pb); rsize += 4; break; \

  712.     case 2: var = avio_rl16(pb); rsize += 2; break; \

  713.     case 1: var = avio_r8(pb);   rsize++; break; \

  714.     default: var = defval; break; \

  715.     }

  716. 

  717. /**

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

  719.  * @param s demux context

  720.  * @param pb context to read data from

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

  722.  */

  723. static int ff_asf_get_packet(AVFormatContext *s, AVIOContext *pb)

  724. {

  725.     ASFContext *asf = s->priv_data;

  726.     uint32_t packet_length, padsize;

  727.     int rsize = 8;

  728.     int c, d, e, off;

  729. 

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

  731.     off= 32768;

  732.     if (asf->no_resync_search)

  733.         off = 3;

  734.     else if (s->packet_size > 0)

  735.         off= (avio_tell(pb) - s->data_offset) % s->packet_size + 3;

  736. 

  737.     c=d=e=-1;

  738.     while(off-- > 0){

  739.         c=d; d=e;

  740.         e= avio_r8(pb);

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

  742.             break;

  743.     }

  744. 

  745.     if (c != 0x82) {

  746.         /**

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

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

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

  750.          * the stream.

  751.          */

  752.         if (pb->error == AVERROR(EAGAIN))

  753.             return AVERROR(EAGAIN);

  754.         if (!url_feof(pb))

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

  756.     }

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

  758.         if (d || e) {

  759.             if (!url_feof(pb))

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

  761.             return -1;

  762.         }

  763.         c= avio_r8(pb);

  764.         d= avio_r8(pb);

  765.         rsize+=3;

  766.     }else if(!url_feof(pb)){

  767.         avio_seek(pb, -1, SEEK_CUR); //FIXME

  768.     }

  769. 

  770.     asf->packet_flags    = c;

  771.     asf->packet_property = d;

  772. 

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

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

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

  776. 

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

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

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

  780.         return -1;

  781.     }

  782.     if(padsize >= packet_length){

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

  784.         return -1;

  785.     }

  786. 

  787.     asf->packet_timestamp = avio_rl32(pb);

  788.     avio_rl16(pb); /* duration */

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

  790. 

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

  792.         asf->packet_segsizetype = avio_r8(pb); rsize++;

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

  794.     } else {

  795.         asf->packet_segments = 1;

  796.         asf->packet_segsizetype = 0x80;

  797.     }

  798.     if (rsize > packet_length - padsize) {

  799.         asf->packet_size_left = 0;

  800.         av_log(s, AV_LOG_ERROR,

  801.                "invalid packet header length %d for pktlen %d-%d at %"PRId64"\n",

  802.                rsize, packet_length, padsize, avio_tell(pb));

  803.         return -1;

  804.     }

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

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

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

  808.     asf->packet_padsize = padsize;

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

  810.     return 0;

  811. }

  812. 

  813. /**

  814.  *

  815.  * @return <0 if error

  816.  */

  817. static int asf_read_frame_header(AVFormatContext *s, AVIOContext *pb){

  818.     ASFContext *asf = s->priv_data;

  819.     int rsize = 1;

  820.     int num = avio_r8(pb);

  821.     int64_t ts0, ts1 av_unused;

  822. 

  823.     asf->packet_segments--;

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

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

  826.     // sequence should be ignored!

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

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

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

  830. //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);

  831.     if (rsize+asf->packet_replic_size > asf->packet_size_left) {

  832.         av_log(s, AV_LOG_ERROR, "packet_replic_size %d is invalid\n", asf->packet_replic_size);

  833.         return -1;

  834.     }

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

  836.         asf->packet_obj_size = avio_rl32(pb);

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

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

  839.             return -1;

  840.         }

  841.         asf->packet_frag_timestamp = avio_rl32(pb); // timestamp

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

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

  844. //                av_log(s, AV_LOG_DEBUG, "%02X ",avio_r8(pb));

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

  846.             avio_skip(pb, 10);

  847.             ts0= avio_rl64(pb);

  848.             ts1= avio_rl64(pb);

  849.             avio_skip(pb, 12);

  850.             avio_rl32(pb);

  851.             avio_skip(pb, asf->packet_replic_size - 8 - 38 - 4);

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

  853.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  854.         }else

  855.             avio_skip(pb, asf->packet_replic_size - 8);

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

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

  858.         // multipacket - frag_offset is beginning timestamp

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

  860.         asf->packet_frag_offset = 0;

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

  862. 

  863.         asf->packet_time_delta = avio_r8(pb);

  864.         rsize++;

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

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

  867.         return -1;

  868.     }

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

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

  871.         if (rsize > asf->packet_size_left) {

  872.             av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");

  873.             return -1;

  874.         } else if(asf->packet_frag_size > asf->packet_size_left - rsize){

  875.             if (asf->packet_frag_size > asf->packet_size_left - rsize + asf->packet_padsize) {

  876.                 av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid (%d-%d)\n", asf->packet_size_left, rsize);

  877.                 return -1;

  878.             } else {

  879.                 int diff = asf->packet_frag_size - (asf->packet_size_left - rsize);

  880.                 asf->packet_size_left += diff;

  881.                 asf->packet_padsize   -= diff;

  882.             }

  883.         }

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

  885.     } else {

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

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

  888.     }

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

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

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

  892.             return -1;

  893.     }

  894.     asf->packet_size_left -= rsize;

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

  896. 

  897.     return 0;

  898. }

  899. 

  900. /**

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

  902.  * with asf_get_packet()).

  903.  * @param s demux context

  904.  * @param pb context to read data from

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

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

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

  908.  */

  909. static int ff_asf_parse_packet(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)

  910. {

  911.     ASFContext *asf = s->priv_data;

  912.     ASFStream *asf_st = 0;

  913.     for (;;) {

  914.         int ret;

  915.         if(url_feof(pb))

  916.             return AVERROR_EOF;

  917.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  922.             assert(ret>=0);

  923.             /* fail safe */

  924.             avio_skip(pb, ret);

  925. 

  926.             asf->packet_pos= avio_tell(pb);

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

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

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

  930.             return 1;

  931.         }

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

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

  934.                 asf->packet_segments= 0;

  935.                 continue;

  936.             }

  937.             if (asf->stream_index < 0

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

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

  940.                 ) {

  941.                 asf->packet_time_start = 0;

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

  943.                 avio_skip(pb, asf->packet_frag_size);

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

  945.                 if(asf->stream_index < 0)

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

  947.                 continue;

  948.             }

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

  950.         }

  951.         asf_st = asf->asf_st;

  952. 

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

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

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

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

  957.             asf->packet_obj_size = asf->packet_frag_size = avio_r8(pb);

  958.             asf->packet_size_left--;

  959.             asf->packet_multi_size--;

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

  961.             {

  962.                 asf->packet_time_start = 0;

  963.                 avio_skip(pb, asf->packet_multi_size);

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

  965.                 continue;

  966.             }

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

  968.             //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);

  969.         }

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

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

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

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

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

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

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

  977.         }

  978. 

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

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

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

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

  983.                 asf_st->frag_offset = 0;

  984.                 av_free_packet(&asf_st->pkt);

  985.             }

  986.             /* new packet */

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

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

  989.             asf_st->pkt.dts = asf->packet_frag_timestamp - asf->hdr.preroll;

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

  991.             asf_st->pkt.pos =

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

  993.             if (asf_st->pkt.data && asf_st->palette_changed) {

  994.                 uint8_t *pal;

  995.                 pal = av_packet_new_side_data(&asf_st->pkt, AV_PKT_DATA_PALETTE,

  996.                                               AVPALETTE_SIZE);

  997.                 if (!pal) {

  998.                     av_log(s, AV_LOG_ERROR, "Cannot append palette to packet\n");

  999.                 } else {

  1000.                     memcpy(pal, asf_st->palette, AVPALETTE_SIZE);

  1001.                     asf_st->palette_changed = 0;

  1002.                 }

  1003.             }

  1004. //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",

  1005. //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,

  1006. //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);

  1007.             if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)

  1008.                 asf->packet_key_frame = 1;

  1009.             if (asf->packet_key_frame)

  1010.                 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;

  1011.         }

  1012. 

  1013.         /* read data */

  1014.         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",

  1015.         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,

  1016.         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);

  1017.         asf->packet_size_left -= asf->packet_frag_size;

  1018.         if (asf->packet_size_left < 0)

  1019.             continue;

  1020. 

  1021.         if(   asf->packet_frag_offset >= asf_st->pkt.size

  1022.            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){

  1023.             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",

  1024.                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);

  1025.             continue;

  1026.         }

  1027. 

  1028.         ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,

  1029.                          asf->packet_frag_size);

  1030.         if (ret != asf->packet_frag_size) {

  1031.             if (ret < 0 || asf->packet_frag_offset + ret == 0)

  1032.                 return ret < 0 ? ret : AVERROR_EOF;

  1033.             if (asf_st->ds_span > 1) {

  1034.                 // scrambling, we can either drop it completely or fill the remainder

  1035.                 // TODO: should we fill the whole packet instead of just the current

  1036.                 // fragment?

  1037.                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,

  1038.                        asf->packet_frag_size - ret);

  1039.                 ret = asf->packet_frag_size;

  1040.             } else

  1041.                 // no scrambling, so we can return partial packets

  1042.                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);

  1043.         }

  1044.         if (s->key && s->keylen == 20)

  1045.             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,

  1046.                             ret);

  1047.         asf_st->frag_offset += ret;

  1048.         /* test if whole packet is read */

  1049.         if (asf_st->frag_offset == asf_st->pkt.size) {

  1050.             //workaround for macroshit radio DVR-MS files

  1051.             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO

  1052.                && asf_st->pkt.size > 100){

  1053.                 int i;

  1054.                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);

  1055.                 if(i == asf_st->pkt.size){

  1056.                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");

  1057.                     asf_st->frag_offset = 0;

  1058.                     av_free_packet(&asf_st->pkt);

  1059.                     continue;

  1060.                 }

  1061.             }

  1062. 

  1063.             /* return packet */

  1064.             if (asf_st->ds_span > 1) {

  1065.               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){

  1066.                     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);

  1067.               }else{

  1068.                 /* packet descrambling */

  1069.                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);

  1070.                 if (newdata) {

  1071.                     int offset = 0;

  1072.                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

  1073.                     while (offset < asf_st->pkt.size) {

  1074.                         int off = offset / asf_st->ds_chunk_size;

  1075.                         int row = off / asf_st->ds_span;

  1076.                         int col = off % asf_st->ds_span;

  1077.                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;

  1078.                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);

  1079. 

  1080.                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);

  1081.                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);

  1082.                         memcpy(newdata + offset,

  1083.                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,

  1084.                                asf_st->ds_chunk_size);

  1085.                         offset += asf_st->ds_chunk_size;

  1086.                     }

  1087.                     av_free(asf_st->pkt.data);

  1088.                     asf_st->pkt.data = newdata;

  1089.                 }

  1090.               }

  1091.             }

  1092.             asf_st->frag_offset = 0;

  1093.             *pkt= asf_st->pkt;

  1094.             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);

  1095.             asf_st->pkt.size = 0;

  1096.             asf_st->pkt.data = 0;

  1097.             asf_st->pkt.side_data_elems = 0;

  1098.             asf_st->pkt.side_data = NULL;

  1099.             break; // packet completed

  1100.         }

  1101.     }

  1102.     return 0;

  1103. }

  1104. 

  1105. static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)

  1106. {

  1107.     ASFContext *asf = s->priv_data;

  1108. 

  1109.     for (;;) {

  1110.         int ret;

  1111. 

  1112.         /* parse cached packets, if any */

  1113.         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)

  1114.             return ret;

  1115.         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)

  1116.             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);

  1117.         asf->packet_time_start = 0;

  1118.     }

  1119. }

  1120. 

  1121. // Added to support seeking after packets have been read

  1122. // If information is not reset, read_packet fails due to

  1123. // leftover information from previous reads

  1124. static void asf_reset_header(AVFormatContext *s)

  1125. {

  1126.     ASFContext *asf = s->priv_data;

  1127.     ASFStream *asf_st;

  1128.     int i;

  1129. 

  1130.     asf->packet_size_left = 0;

  1131.     asf->packet_segments = 0;

  1132.     asf->packet_flags = 0;

  1133.     asf->packet_property = 0;

  1134.     asf->packet_timestamp = 0;

  1135.     asf->packet_segsizetype = 0;

  1136.     asf->packet_segments = 0;

  1137.     asf->packet_seq = 0;

  1138.     asf->packet_replic_size = 0;

  1139.     asf->packet_key_frame = 0;

  1140.     asf->packet_padsize = 0;

  1141.     asf->packet_frag_offset = 0;

  1142.     asf->packet_frag_size = 0;

  1143.     asf->packet_frag_timestamp = 0;

  1144.     asf->packet_multi_size = 0;

  1145.     asf->packet_obj_size = 0;

  1146.     asf->packet_time_delta = 0;

  1147.     asf->packet_time_start = 0;

  1148. 

  1149.     for(i=0; i<s->nb_streams; i++){

  1150.         asf_st= s->streams[i]->priv_data;

  1151.         av_free_packet(&asf_st->pkt);

  1152.         asf_st->frag_offset=0;

  1153.         asf_st->seq=0;

  1154.     }

  1155.     asf->asf_st= NULL;

  1156. }

  1157. 

  1158. static int asf_read_close(AVFormatContext *s)

  1159. {

  1160.     asf_reset_header(s);

  1161. 

  1162.     return 0;

  1163. }

  1164. 

  1165. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  1166. {

  1167.     AVPacket pkt1, *pkt = &pkt1;

  1168.     ASFStream *asf_st;

  1169.     int64_t pts;

  1170.     int64_t pos= *ppos;

  1171.     int i;

  1172.     int64_t start_pos[ASF_MAX_STREAMS];

  1173. 

  1174.     for(i=0; i<s->nb_streams; i++){

  1175.         start_pos[i]= pos;

  1176.     }

  1177. 

  1178.     if (s->packet_size > 0)

  1179.         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;

  1180.     *ppos= pos;

  1181.     if (avio_seek(s->pb, pos, SEEK_SET) < 0)

  1182.         return AV_NOPTS_VALUE;

  1183. 

  1184. //printf("asf_read_pts\n");

  1185.     asf_reset_header(s);

  1186.     for(;;){

  1187.         if (av_read_frame(s, pkt) < 0){

  1188.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1189.             return AV_NOPTS_VALUE;

  1190.         }

  1191. 

  1192.         pts = pkt->dts;

  1193. 

  1194.         av_free_packet(pkt);

  1195.         if(pkt->flags&AV_PKT_FLAG_KEY){

  1196.             i= pkt->stream_index;

  1197. 

  1198.             asf_st= s->streams[i]->priv_data;

  1199. 

  1200. //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);

  1201.             pos= asf_st->packet_pos;

  1202. 

  1203.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1204.             start_pos[i]= asf_st->packet_pos + 1;

  1205. 

  1206.             if(pkt->stream_index == stream_index)

  1207.                break;

  1208.         }

  1209.     }

  1210. 

  1211.     *ppos= pos;

  1212. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1213. 

  1214.     return pts;

  1215. }

  1216. 

  1217. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1218. {

  1219.     ff_asf_guid g;

  1220.     ASFContext *asf = s->priv_data;

  1221.     int64_t current_pos= avio_tell(s->pb);

  1222. 

  1223.     if(avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET) < 0) {

  1224.         asf->index_read= -1;

  1225.         return;

  1226.     }

  1227. 

  1228.     ff_get_guid(s->pb, &g);

  1229. 

  1230.     /* the data object can be followed by other top-level objects,

  1231.        skip them until the simple index object is reached */

  1232.     while (ff_guidcmp(&g, &ff_asf_simple_index_header)) {

  1233.         int64_t gsize= avio_rl64(s->pb);

  1234.         if (gsize < 24 || url_feof(s->pb)) {

  1235.             avio_seek(s->pb, current_pos, SEEK_SET);

  1236.             asf->index_read= -1;

  1237.             return;

  1238.         }

  1239.         avio_skip(s->pb, gsize-24);

  1240.         ff_get_guid(s->pb, &g);

  1241.     }

  1242. 

  1243.     {

  1244.         int64_t itime, last_pos=-1;

  1245.         int pct, ict;

  1246.         int i;

  1247.         int64_t av_unused gsize= avio_rl64(s->pb);

  1248.         ff_get_guid(s->pb, &g);

  1249.         itime=avio_rl64(s->pb);

  1250.         pct=avio_rl32(s->pb);

  1251.         ict=avio_rl32(s->pb);

  1252.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1253. 

  1254.         for (i=0;i<ict;i++){

  1255.             int pktnum=avio_rl32(s->pb);

  1256.             int pktct =avio_rl16(s->pb);

  1257.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1258.             int64_t index_pts= FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);

  1259. 

  1260.             if(pos != last_pos){

  1261.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d  pts: %"PRId64"\n", pktnum, pktct, index_pts);

  1262.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1263.             last_pos=pos;

  1264.             }

  1265.         }

  1266.         asf->index_read= ict > 0;

  1267.     }

  1268.     avio_seek(s->pb, current_pos, SEEK_SET);

  1269. }

  1270. 

  1271. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1272. {

  1273.     ASFContext *asf = s->priv_data;

  1274.     AVStream *st = s->streams[stream_index];

  1275. 

  1276.     if (s->packet_size <= 0)

  1277.         return -1;

  1278. 

  1279.     /* Try using the protocol's read_seek if available */

  1280.     if(s->pb) {

  1281.         int ret = avio_seek_time(s->pb, stream_index, pts, flags);

  1282.         if(ret >= 0)

  1283.             asf_reset_header(s);

  1284.         if (ret != AVERROR(ENOSYS))

  1285.             return ret;

  1286.     }

  1287. 

  1288.     if (!asf->index_read)

  1289.         asf_build_simple_index(s, stream_index);

  1290. 

  1291.     if((asf->index_read > 0 && st->index_entries)){

  1292.         int index= av_index_search_timestamp(st, pts, flags);

  1293.         if(index >= 0) {

  1294.             /* find the position */

  1295.             uint64_t pos = st->index_entries[index].pos;

  1296. 

  1297.             /* do the seek */

  1298.             av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1299.             if(avio_seek(s->pb, pos, SEEK_SET) < 0)

  1300.                 return -1;

  1301.             asf_reset_header(s);

  1302.             return 0;

  1303.         }

  1304.     }

  1305.     /* no index or seeking by index failed */

  1306.     if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)

  1307.         return -1;

  1308.     asf_reset_header(s);

  1309.     return 0;

  1310. }

  1311. 

  1312. AVInputFormat ff_asf_demuxer = {

  1313.     .name           = "asf",

  1314.     .long_name      = NULL_IF_CONFIG_SMALL("ASF format"),

  1315.     .priv_data_size = sizeof(ASFContext),

  1316.     .read_probe     = asf_probe,

  1317.     .read_header    = asf_read_header,

  1318.     .read_packet    = asf_read_packet,

  1319.     .read_close     = asf_read_close,

  1320.     .read_seek      = asf_read_seek,

  1321.     .read_timestamp = asf_read_pts,

  1322.     .flags          = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,

  1323.     .priv_class     = &asf_class,

  1324. };