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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 "avformat.h"

  30. #include "internal.h"

  31. #include "avio_internal.h"

  32. #include "riff.h"

  33. #include "asf.h"

  34. #include "asfcrypt.h"

  35. #include "avlanguage.h"

  36. 

  37. typedef struct {

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

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

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

  41.     AVRational dar[128];

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

  43.     /* non streamed additonnal info */

  44.     /* packet filling */

  45.     int packet_size_left;

  46.     /* only for reading */

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

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

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

  50.     int index_read;

  51. 

  52.     ASFMainHeader hdr;

  53. 

  54.     int packet_flags;

  55.     int packet_property;

  56.     int packet_timestamp;

  57.     int packet_segsizetype;

  58.     int packet_segments;

  59.     int packet_seq;

  60.     int packet_replic_size;

  61.     int packet_key_frame;

  62.     int packet_padsize;

  63.     unsigned int packet_frag_offset;

  64.     unsigned int packet_frag_size;

  65.     int64_t packet_frag_timestamp;

  66.     int packet_multi_size;

  67.     int packet_obj_size;

  68.     int packet_time_delta;

  69.     int packet_time_start;

  70.     int64_t packet_pos;

  71. 

  72.     int stream_index;

  73. 

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

  75. } ASFContext;

  76. 

  77. #undef NDEBUG

  78. #include <assert.h>

  79. 

  80. #define ASF_MAX_STREAMS 127

  81. #define FRAME_HEADER_SIZE 17

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

  83. 

  84. #ifdef DEBUG

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

  86.     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2

  87. };

  88. 

  89. #define PRINT_IF_GUID(g,cmp) \

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

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

  92. 

  93. static void print_guid(const ff_asf_guid *g)

  94. {

  95.     int i;

  96.     PRINT_IF_GUID(g, ff_asf_header);

  97.     else PRINT_IF_GUID(g, ff_asf_file_header);

  98.     else PRINT_IF_GUID(g, ff_asf_stream_header);

  99.     else PRINT_IF_GUID(g, ff_asf_audio_stream);

  100.     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);

  101.     else PRINT_IF_GUID(g, ff_asf_video_stream);

  102.     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);

  103.     else PRINT_IF_GUID(g, ff_asf_command_stream);

  104.     else PRINT_IF_GUID(g, ff_asf_comment_header);

  105.     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);

  106.     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);

  107.     else PRINT_IF_GUID(g, ff_asf_data_header);

  108.     else PRINT_IF_GUID(g, ff_asf_simple_index_header);

  109.     else PRINT_IF_GUID(g, ff_asf_head1_guid);

  110.     else PRINT_IF_GUID(g, ff_asf_head2_guid);

  111.     else PRINT_IF_GUID(g, ff_asf_my_guid);

  112.     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);

  113.     else PRINT_IF_GUID(g, ff_asf_extended_content_header);

  114.     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);

  115.     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);

  116.     else PRINT_IF_GUID(g, ff_asf_metadata_header);

  117.     else PRINT_IF_GUID(g, ff_asf_marker_header);

  118.     else PRINT_IF_GUID(g, stream_bitrate_guid);

  119.     else PRINT_IF_GUID(g, ff_asf_language_guid);

  120.     else

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

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

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

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

  125. }

  126. #undef PRINT_IF_GUID

  127. #else

  128. #define print_guid(g)

  129. #endif

  130. 

  131. static int asf_probe(AVProbeData *pd)

  132. {

  133.     /* check file header */

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

  135.         return AVPROBE_SCORE_MAX;

  136.     else

  137.         return 0;

  138. }

  139. 

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

  141.     switch(type){

  142.         case 2: return avio_rl32(pb);

  143.         case 3: return avio_rl32(pb);

  144.         case 4: return avio_rl64(pb);

  145.         case 5: return avio_rl16(pb);

  146.         default:return INT_MIN;

  147.     }

  148. }

  149. 

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

  151. {

  152.     char *value;

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

  154. 

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

  156.         return;

  157. 

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

  159.     if (!value)

  160.         goto finish;

  161. 

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

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

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

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

  166.         value[len]=0;

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

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

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

  170.     } else {

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

  172.         goto finish;

  173.     }

  174.     if (*value)

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

  176. finish:

  177.     av_freep(&value);

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

  179. }

  180. 

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

  182. {

  183.     ASFContext *asf = s->priv_data;

  184.     AVIOContext *pb = s->pb;

  185. 

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

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

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

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

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

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

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

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

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

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

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

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

  198.         return AVERROR_INVALIDDATA;

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

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

  201. 

  202.     return 0;

  203. }

  204. 

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

  206. {

  207.     ASFContext *asf = s->priv_data;

  208.     AVIOContext *pb = s->pb;

  209.     AVStream *st;

  210.     ASFStream *asf_st;

  211.     ff_asf_guid g;

  212.     enum AVMediaType type;

  213.     int type_specific_size, sizeX;

  214.     unsigned int tag1;

  215.     int64_t pos1, pos2, start_time;

  216.     int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  217. 

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

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

  220.         return AVERROR(EINVAL);

  221.     }

  222. 

  223.     pos1 = avio_tell(pb);

  224. 

  225.     st = avformat_new_stream(s, NULL);

  226.     if (!st)

  227.         return AVERROR(ENOMEM);

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

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

  230.     if (!asf_st)

  231.         return AVERROR(ENOMEM);

  232.     st->priv_data = asf_st;

  233.     start_time = asf->hdr.preroll;

  234. 

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

  236. 

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

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

  239.             (10000000 / 1000) - start_time;

  240.     }

  241.     ff_get_guid(pb, &g);

  242. 

  243.     test_for_ext_stream_audio = 0;

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

  245.         type = AVMEDIA_TYPE_AUDIO;

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

  247.         type = AVMEDIA_TYPE_VIDEO;

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

  249.         type = AVMEDIA_TYPE_VIDEO;

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

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

  252.         type = AVMEDIA_TYPE_DATA;

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

  254.         test_for_ext_stream_audio = 1;

  255.         type = AVMEDIA_TYPE_UNKNOWN;

  256.     } else {

  257.         return -1;

  258.     }

  259.     ff_get_guid(pb, &g);

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

  261.     type_specific_size = avio_rl32(pb);

  262.     avio_rl32(pb);

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

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

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

  266. 

  267.     avio_rl32(pb);

  268. 

  269.     if (test_for_ext_stream_audio) {

  270.         ff_get_guid(pb, &g);

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

  272.             type = AVMEDIA_TYPE_AUDIO;

  273.             is_dvr_ms_audio=1;

  274.             ff_get_guid(pb, &g);

  275.             avio_rl32(pb);

  276.             avio_rl32(pb);

  277.             avio_rl32(pb);

  278.             ff_get_guid(pb, &g);

  279.             avio_rl32(pb);

  280.         }

  281.     }

  282. 

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

  284.     if (type == AVMEDIA_TYPE_AUDIO) {

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

  286.         if (ret < 0)

  287.             return ret;

  288.         if (is_dvr_ms_audio) {

  289.             // codec_id and codec_tag are unreliable in dvr_ms

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

  291.             st->request_probe= 1;

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

  293.         }

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

  295.             st->need_parsing = AVSTREAM_PARSE_NONE;

  296.         } else {

  297.             st->need_parsing = AVSTREAM_PARSE_FULL;

  298.         }

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

  300.         pos2 = avio_tell(pb);

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

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

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

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

  305.             avio_rl16(pb); //ds_data_size

  306.             avio_r8(pb);   //ds_silence_data

  307.         }

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

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

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

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

  312.             if (!asf_st->ds_chunk_size

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

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

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

  316.         }

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

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

  319.         avio_rl32(pb);

  320.         avio_rl32(pb);

  321.         avio_r8(pb);

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

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

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

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

  326.         /* not available for asf */

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

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

  329.         tag1 = avio_rl32(pb);

  330.         avio_skip(pb, 20);

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

  332.         if (sizeX > 40) {

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

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

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

  336.         }

  337. 

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

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

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

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

  342. #if HAVE_BIGENDIAN

  343.             int i;

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

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

  346. #else

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

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

  349. #endif

  350.             asf_st->palette_changed = 1;

  351.         }

  352. 

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

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

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

  356.             st->need_parsing = AVSTREAM_PARSE_FULL;

  357.             // 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

  358.             st->codec->width  =

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

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

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

  362.         }

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

  364.             st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;

  365.     }

  366.     pos2 = avio_tell(pb);

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

  368. 

  369.     return 0;

  370. }

  371. 

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

  373. {

  374.     ASFContext *asf = s->priv_data;

  375.     AVIOContext *pb = s->pb;

  376.     ff_asf_guid g;

  377.     int ext_len, payload_ext_ct, stream_ct, i;

  378.     uint32_t leak_rate, stream_num;

  379.     unsigned int stream_languageid_index;

  380. 

  381.     avio_rl64(pb); // starttime

  382.     avio_rl64(pb); // endtime

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

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

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

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

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

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

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

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

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

  392. 

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

  394.     if (stream_num < 128)

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

  396. 

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

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

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

  400. 

  401.     if (stream_num < 128)

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

  403. 

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

  405.         avio_rl16(pb);

  406.         ext_len = avio_rl16(pb);

  407.         avio_skip(pb, ext_len);

  408.     }

  409. 

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

  411.         ff_get_guid(pb, &g);

  412.         avio_skip(pb, 2);

  413.         ext_len=avio_rl32(pb);

  414.         avio_skip(pb, ext_len);

  415.     }

  416. 

  417.     return 0;

  418. }

  419. 

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

  421. {

  422.     AVIOContext *pb = s->pb;

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

  424. 

  425.     len1 = avio_rl16(pb);

  426.     len2 = avio_rl16(pb);

  427.     len3 = avio_rl16(pb);

  428.     len4 = avio_rl16(pb);

  429.     len5 = avio_rl16(pb);

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

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

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

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

  434.     avio_skip(pb, len5);

  435. 

  436.     return 0;

  437. }

  438. 

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

  440. {

  441.     AVIOContext *pb = s->pb;

  442.     ASFContext *asf = s->priv_data;

  443.     int desc_count, i, ret;

  444. 

  445.     desc_count = avio_rl16(pb);

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

  447.         int name_len,value_type,value_len;

  448.         char name[1024];

  449. 

  450.         name_len = avio_rl16(pb);

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

  452.             name_len += 1;

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

  454.             avio_skip(pb, name_len - ret);

  455.         value_type = avio_rl16(pb);

  456.         value_len  = avio_rl16(pb);

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

  458.             value_len += 1;

  459.         /**

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

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

  462.          */

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

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

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

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

  467.         } else

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

  469.     }

  470. 

  471.     return 0;

  472. }

  473. 

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

  475. {

  476.     AVIOContext *pb = s->pb;

  477.     ASFContext *asf = s->priv_data;

  478.     int j, ret;

  479.     int stream_count = avio_rl16(pb);

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

  481.         char lang[6];

  482.         unsigned int lang_len = avio_r8(pb);

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

  484.             avio_skip(pb, lang_len - ret);

  485.         if (j < 128)

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

  487.     }

  488. 

  489.     return 0;

  490. }

  491. 

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

  493. {

  494.     AVIOContext *pb = s->pb;

  495.     ASFContext *asf = s->priv_data;

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

  497.     int ret, i;

  498.     n = avio_rl16(pb);

  499. 

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

  501.         char name[1024];

  502. 

  503.         avio_rl16(pb); //lang_list_index

  504.         stream_num= avio_rl16(pb);

  505.         name_len=   avio_rl16(pb);

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

  507.         value_len=  avio_rl32(pb);

  508. 

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

  510.             avio_skip(pb, name_len - ret);

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

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

  513.         avio_skip(pb, value_len - 2);

  514. 

  515.         if(stream_num<128){

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

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

  518.         }

  519.     }

  520. 

  521.     return 0;

  522. }

  523. 

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

  525. {

  526.     AVIOContext *pb = s->pb;

  527.     int i, count, name_len, ret;

  528.     char name[1024];

  529. 

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

  531.     avio_rl64(pb);            // ...

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

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

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

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

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

  537.     }

  538. 

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

  540.         int64_t pres_time;

  541.         int name_len;

  542. 

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

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

  545.         avio_rl16(pb);             // entry length

  546.         avio_rl32(pb);             // send time

  547.         avio_rl32(pb);             // flags

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

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

  550.             avio_skip(pb, name_len - ret);

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

  552.     }

  553. 

  554.     return 0;

  555. }

  556. 

  557. static int asf_read_header(AVFormatContext *s)

  558. {

  559.     ASFContext *asf = s->priv_data;

  560.     ff_asf_guid g;

  561.     AVIOContext *pb = s->pb;

  562.     int i;

  563.     int64_t gsize;

  564. 

  565.     ff_get_guid(pb, &g);

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

  567.         return -1;

  568.     avio_rl64(pb);

  569.     avio_rl32(pb);

  570.     avio_r8(pb);

  571.     avio_r8(pb);

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

  573.     for(;;) {

  574.         uint64_t gpos= avio_tell(pb);

  575.         ff_get_guid(pb, &g);

  576.         gsize = avio_rl64(pb);

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

  578.         print_guid(&g);

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

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

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

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

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

  584.                 asf->data_object_size = gsize - 24;

  585.             } else {

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

  587.             }

  588.             break;

  589.         }

  590.         if (gsize < 24)

  591.             return -1;

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

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

  594.             if (ret < 0)

  595.                 return ret;

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

  597.             asf_read_stream_properties(s, gsize);

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

  599.             asf_read_content_desc(s, gsize);

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

  601.             asf_read_language_list(s, gsize);

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

  603.             asf_read_ext_content_desc(s, gsize);

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

  605.             asf_read_metadata(s, gsize);

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

  607.             asf_read_ext_stream_properties(s, gsize);

  608. 

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

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

  611.             continue;

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

  613.             ff_get_guid(pb, &g);

  614.             avio_skip(pb, 6);

  615.             continue;

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

  617.             asf_read_marker(s, gsize);

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

  619.             return -1;

  620.         } else {

  621.             if (!s->keylen) {

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

  623.                     unsigned int len;

  624.                     AVPacket pkt;

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

  626.                     len= avio_rl32(pb);

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

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

  629.                     len= avio_rl32(pb);

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

  631.                     len= avio_rl32(pb);

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

  633.                     len= avio_rl32(pb);

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

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

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

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

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

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

  640.                 }

  641.             }

  642.         }

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

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

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

  646.     }

  647.     ff_get_guid(pb, &g);

  648.     avio_rl64(pb);

  649.     avio_r8(pb);

  650.     avio_r8(pb);

  651.     if (url_feof(pb))

  652.         return -1;

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

  654.     asf->packet_size_left = 0;

  655. 

  656. 

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

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

  659.         if(stream_num>=0){

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

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

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

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

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

  665.                           &st->sample_aspect_ratio.den,

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

  667.             } 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.

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

  669.                           &st->sample_aspect_ratio.den,

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

  671. 

  672. //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);

  673. 

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

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

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

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

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

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

  680.                     if (iso6392)

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

  682.                 }

  683.             }

  684.         }

  685.     }

  686. 

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

  688. 

  689.     return 0;

  690. }

  691. 

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

  693.     switch (bits & 3) \

  694.     { \

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

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

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

  698.     default: var = defval; break; \

  699.     }

  700. 

  701. /**

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

  703.  * @param s demux context

  704.  * @param pb context to read data from

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

  706.  */

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

  708. {

  709.     ASFContext *asf = s->priv_data;

  710.     uint32_t packet_length, padsize;

  711.     int rsize = 8;

  712.     int c, d, e, off;

  713. 

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

  715.     off= 32768;

  716.     if (s->packet_size > 0)

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

  718. 

  719.     c=d=e=-1;

  720.     while(off-- > 0){

  721.         c=d; d=e;

  722.         e= avio_r8(pb);

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

  724.             break;

  725.     }

  726. 

  727.     if (c != 0x82) {

  728.         /**

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

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

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

  732.          * the stream.

  733.          */

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

  735.             return AVERROR(EAGAIN);

  736.         if (!url_feof(pb))

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

  738.     }

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

  740.         if (d || e) {

  741.             if (!url_feof(pb))

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

  743.             return -1;

  744.         }

  745.         c= avio_r8(pb);

  746.         d= avio_r8(pb);

  747.         rsize+=3;

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

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

  750.     }

  751. 

  752.     asf->packet_flags    = c;

  753.     asf->packet_property = d;

  754. 

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

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

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

  758. 

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

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

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

  762.         return -1;

  763.     }

  764.     if(padsize >= packet_length){

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

  766.         return -1;

  767.     }

  768. 

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

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

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

  772. 

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

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

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

  776.     } else {

  777.         asf->packet_segments = 1;

  778.         asf->packet_segsizetype = 0x80;

  779.     }

  780.     if (rsize > packet_length - padsize) {

  781.         asf->packet_size_left = 0;

  782.         av_log(s, AV_LOG_ERROR,

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

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

  785.         return -1;

  786.     }

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

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

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

  790.     asf->packet_padsize = padsize;

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

  792.     return 0;

  793. }

  794. 

  795. /**

  796.  *

  797.  * @return <0 if error

  798.  */

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

  800.     ASFContext *asf = s->priv_data;

  801.     int rsize = 1;

  802.     int num = avio_r8(pb);

  803.     int64_t ts0, ts1 av_unused;

  804. 

  805.     asf->packet_segments--;

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

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

  808.     // sequence should be ignored!

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

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

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

  812. //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);

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

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

  815.         return -1;

  816.     }

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

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

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

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

  821.             return -1;

  822.         }

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

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

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

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

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

  828.             avio_skip(pb, 10);

  829.             ts0= avio_rl64(pb);

  830.             ts1= avio_rl64(pb);

  831.             avio_skip(pb, 12);

  832.             avio_rl32(pb);

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

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

  835.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  836.         }else

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

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

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

  840.         // multipacket - frag_offset is beginning timestamp

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

  842.         asf->packet_frag_offset = 0;

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

  844. 

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

  846.         rsize++;

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

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

  849.         return -1;

  850.     }

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

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

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

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

  855.             return -1;

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

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

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

  859.                 return -1;

  860.             } else {

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

  862.                 asf->packet_size_left += diff;

  863.                 asf->packet_padsize   -= diff;

  864.             }

  865.         }

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

  867.     } else {

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

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

  870.     }

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

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

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

  874.             return -1;

  875.     }

  876.     asf->packet_size_left -= rsize;

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

  878. 

  879.     return 0;

  880. }

  881. 

  882. /**

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

  884.  * with asf_get_packet()).

  885.  * @param s demux context

  886.  * @param pb context to read data from

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

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

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

  890.  */

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

  892. {

  893.     ASFContext *asf = s->priv_data;

  894.     ASFStream *asf_st = 0;

  895.     for (;;) {

  896.         int ret;

  897.         if(url_feof(pb))

  898.             return AVERROR_EOF;

  899.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  904.             assert(ret>=0);

  905.             /* fail safe */

  906.             avio_skip(pb, ret);

  907. 

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

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

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

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

  912.             return 1;

  913.         }

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

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

  916.                 asf->packet_segments= 0;

  917.                 continue;

  918.             }

  919.             if (asf->stream_index < 0

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

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

  922.                 ) {

  923.                 asf->packet_time_start = 0;

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

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

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

  927.                 if(asf->stream_index < 0)

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

  929.                 continue;

  930.             }

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

  932.         }

  933.         asf_st = asf->asf_st;

  934. 

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

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

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

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

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

  940.             asf->packet_size_left--;

  941.             asf->packet_multi_size--;

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

  943.             {

  944.                 asf->packet_time_start = 0;

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

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

  947.                 continue;

  948.             }

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

  950.             //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);

  951.         }

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

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

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

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

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

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

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

  959.         }

  960. 

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

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

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

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

  965.                 asf_st->frag_offset = 0;

  966.                 av_free_packet(&asf_st->pkt);

  967.             }

  968.             /* new packet */

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

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

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

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

  973.             asf_st->pkt.pos =

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

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

  976.                 uint8_t *pal;

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

  978.                                               AVPALETTE_SIZE);

  979.                 if (!pal) {

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

  981.                 } else {

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

  983.                     asf_st->palette_changed = 0;

  984.                 }

  985.             }

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

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

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

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

  990.                 asf->packet_key_frame = 1;

  991.             if (asf->packet_key_frame)

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

  993.         }

  994. 

  995.         /* read data */

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

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

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

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

  1000.         if (asf->packet_size_left < 0)

  1001.             continue;

  1002. 

  1003.         if(   asf->packet_frag_offset >= asf_st->pkt.size

  1004.            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){

  1005.             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",

  1006.                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);

  1007.             continue;

  1008.         }

  1009. 

  1010.         ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,

  1011.                          asf->packet_frag_size);

  1012.         if (ret != asf->packet_frag_size) {

  1013.             if (ret < 0 || asf->packet_frag_offset + ret == 0)

  1014.                 return ret < 0 ? ret : AVERROR_EOF;

  1015.             if (asf_st->ds_span > 1) {

  1016.                 // scrambling, we can either drop it completely or fill the remainder

  1017.                 // TODO: should we fill the whole packet instead of just the current

  1018.                 // fragment?

  1019.                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,

  1020.                        asf->packet_frag_size - ret);

  1021.                 ret = asf->packet_frag_size;

  1022.             } else

  1023.                 // no scrambling, so we can return partial packets

  1024.                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);

  1025.         }

  1026.         if (s->key && s->keylen == 20)

  1027.             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,

  1028.                             ret);

  1029.         asf_st->frag_offset += ret;

  1030.         /* test if whole packet is read */

  1031.         if (asf_st->frag_offset == asf_st->pkt.size) {

  1032.             //workaround for macroshit radio DVR-MS files

  1033.             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO

  1034.                && asf_st->pkt.size > 100){

  1035.                 int i;

  1036.                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);

  1037.                 if(i == asf_st->pkt.size){

  1038.                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");

  1039.                     asf_st->frag_offset = 0;

  1040.                     av_free_packet(&asf_st->pkt);

  1041.                     continue;

  1042.                 }

  1043.             }

  1044. 

  1045.             /* return packet */

  1046.             if (asf_st->ds_span > 1) {

  1047.               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){

  1048.                     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);

  1049.               }else{

  1050.                 /* packet descrambling */

  1051.                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);

  1052.                 if (newdata) {

  1053.                     int offset = 0;

  1054.                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

  1055.                     while (offset < asf_st->pkt.size) {

  1056.                         int off = offset / asf_st->ds_chunk_size;

  1057.                         int row = off / asf_st->ds_span;

  1058.                         int col = off % asf_st->ds_span;

  1059.                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;

  1060.                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);

  1061. 

  1062.                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);

  1063.                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);

  1064.                         memcpy(newdata + offset,

  1065.                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,

  1066.                                asf_st->ds_chunk_size);

  1067.                         offset += asf_st->ds_chunk_size;

  1068.                     }

  1069.                     av_free(asf_st->pkt.data);

  1070.                     asf_st->pkt.data = newdata;

  1071.                 }

  1072.               }

  1073.             }

  1074.             asf_st->frag_offset = 0;

  1075.             *pkt= asf_st->pkt;

  1076.             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);

  1077.             asf_st->pkt.size = 0;

  1078.             asf_st->pkt.data = 0;

  1079.             asf_st->pkt.side_data_elems = 0;

  1080.             asf_st->pkt.side_data = NULL;

  1081.             break; // packet completed

  1082.         }

  1083.     }

  1084.     return 0;

  1085. }

  1086. 

  1087. static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)

  1088. {

  1089.     ASFContext *asf = s->priv_data;

  1090. 

  1091.     for (;;) {

  1092.         int ret;

  1093. 

  1094.         /* parse cached packets, if any */

  1095.         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)

  1096.             return ret;

  1097.         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)

  1098.             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);

  1099.         asf->packet_time_start = 0;

  1100.     }

  1101. }

  1102. 

  1103. // Added to support seeking after packets have been read

  1104. // If information is not reset, read_packet fails due to

  1105. // leftover information from previous reads

  1106. static void asf_reset_header(AVFormatContext *s)

  1107. {

  1108.     ASFContext *asf = s->priv_data;

  1109.     ASFStream *asf_st;

  1110.     int i;

  1111. 

  1112.     asf->packet_size_left = 0;

  1113.     asf->packet_segments = 0;

  1114.     asf->packet_flags = 0;

  1115.     asf->packet_property = 0;

  1116.     asf->packet_timestamp = 0;

  1117.     asf->packet_segsizetype = 0;

  1118.     asf->packet_segments = 0;

  1119.     asf->packet_seq = 0;

  1120.     asf->packet_replic_size = 0;

  1121.     asf->packet_key_frame = 0;

  1122.     asf->packet_padsize = 0;

  1123.     asf->packet_frag_offset = 0;

  1124.     asf->packet_frag_size = 0;

  1125.     asf->packet_frag_timestamp = 0;

  1126.     asf->packet_multi_size = 0;

  1127.     asf->packet_obj_size = 0;

  1128.     asf->packet_time_delta = 0;

  1129.     asf->packet_time_start = 0;

  1130. 

  1131.     for(i=0; i<s->nb_streams; i++){

  1132.         asf_st= s->streams[i]->priv_data;

  1133.         av_free_packet(&asf_st->pkt);

  1134.         asf_st->frag_offset=0;

  1135.         asf_st->seq=0;

  1136.     }

  1137.     asf->asf_st= NULL;

  1138. }

  1139. 

  1140. static int asf_read_close(AVFormatContext *s)

  1141. {

  1142.     asf_reset_header(s);

  1143. 

  1144.     return 0;

  1145. }

  1146. 

  1147. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  1148. {

  1149.     AVPacket pkt1, *pkt = &pkt1;

  1150.     ASFStream *asf_st;

  1151.     int64_t pts;

  1152.     int64_t pos= *ppos;

  1153.     int i;

  1154.     int64_t start_pos[ASF_MAX_STREAMS];

  1155. 

  1156.     for(i=0; i<s->nb_streams; i++){

  1157.         start_pos[i]= pos;

  1158.     }

  1159. 

  1160.     if (s->packet_size > 0)

  1161.         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;

  1162.     *ppos= pos;

  1163.     if (avio_seek(s->pb, pos, SEEK_SET) < 0)

  1164.         return AV_NOPTS_VALUE;

  1165. 

  1166. //printf("asf_read_pts\n");

  1167.     asf_reset_header(s);

  1168.     for(;;){

  1169.         if (av_read_frame(s, pkt) < 0){

  1170.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1171.             return AV_NOPTS_VALUE;

  1172.         }

  1173. 

  1174.         pts = pkt->dts;

  1175. 

  1176.         av_free_packet(pkt);

  1177.         if(pkt->flags&AV_PKT_FLAG_KEY){

  1178.             i= pkt->stream_index;

  1179. 

  1180.             asf_st= s->streams[i]->priv_data;

  1181. 

  1182. //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);

  1183.             pos= asf_st->packet_pos;

  1184. 

  1185.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1186.             start_pos[i]= asf_st->packet_pos + 1;

  1187. 

  1188.             if(pkt->stream_index == stream_index)

  1189.                break;

  1190.         }

  1191.     }

  1192. 

  1193.     *ppos= pos;

  1194. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1195. 

  1196.     return pts;

  1197. }

  1198. 

  1199. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1200. {

  1201.     ff_asf_guid g;

  1202.     ASFContext *asf = s->priv_data;

  1203.     int64_t current_pos= avio_tell(s->pb);

  1204. 

  1205.     if(avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET) < 0) {

  1206.         asf->index_read= -1;

  1207.         return;

  1208.     }

  1209. 

  1210.     ff_get_guid(s->pb, &g);

  1211. 

  1212.     /* the data object can be followed by other top-level objects,

  1213.        skip them until the simple index object is reached */

  1214.     while (ff_guidcmp(&g, &ff_asf_simple_index_header)) {

  1215.         int64_t gsize= avio_rl64(s->pb);

  1216.         if (gsize < 24 || url_feof(s->pb)) {

  1217.             avio_seek(s->pb, current_pos, SEEK_SET);

  1218.             asf->index_read= -1;

  1219.             return;

  1220.         }

  1221.         avio_skip(s->pb, gsize-24);

  1222.         ff_get_guid(s->pb, &g);

  1223.     }

  1224. 

  1225.     {

  1226.         int64_t itime, last_pos=-1;

  1227.         int pct, ict;

  1228.         int i;

  1229.         int64_t av_unused gsize= avio_rl64(s->pb);

  1230.         ff_get_guid(s->pb, &g);

  1231.         itime=avio_rl64(s->pb);

  1232.         pct=avio_rl32(s->pb);

  1233.         ict=avio_rl32(s->pb);

  1234.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1235. 

  1236.         for (i=0;i<ict;i++){

  1237.             int pktnum=avio_rl32(s->pb);

  1238.             int pktct =avio_rl16(s->pb);

  1239.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1240.             int64_t index_pts= FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);

  1241. 

  1242.             if(pos != last_pos){

  1243.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d  pts: %"PRId64"\n", pktnum, pktct, index_pts);

  1244.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1245.             last_pos=pos;

  1246.             }

  1247.         }

  1248.         asf->index_read= ict > 0;

  1249.     }

  1250.     avio_seek(s->pb, current_pos, SEEK_SET);

  1251. }

  1252. 

  1253. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1254. {

  1255.     ASFContext *asf = s->priv_data;

  1256.     AVStream *st = s->streams[stream_index];

  1257. 

  1258.     if (s->packet_size <= 0)

  1259.         return -1;

  1260. 

  1261.     /* Try using the protocol's read_seek if available */

  1262.     if(s->pb) {

  1263.         int ret = avio_seek_time(s->pb, stream_index, pts, flags);

  1264.         if(ret >= 0)

  1265.             asf_reset_header(s);

  1266.         if (ret != AVERROR(ENOSYS))

  1267.             return ret;

  1268.     }

  1269. 

  1270.     if (!asf->index_read)

  1271.         asf_build_simple_index(s, stream_index);

  1272. 

  1273.     if((asf->index_read > 0 && st->index_entries)){

  1274.         int index= av_index_search_timestamp(st, pts, flags);

  1275.         if(index >= 0) {

  1276.             /* find the position */

  1277.             uint64_t pos = st->index_entries[index].pos;

  1278. 

  1279.             /* do the seek */

  1280.             av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1281.             if(avio_seek(s->pb, pos, SEEK_SET) < 0)

  1282.                 return -1;

  1283.             asf_reset_header(s);

  1284.             return 0;

  1285.         }

  1286.     }

  1287.     /* no index or seeking by index failed */

  1288.     if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)

  1289.         return -1;

  1290.     asf_reset_header(s);

  1291.     return 0;

  1292. }

  1293. 

  1294. AVInputFormat ff_asf_demuxer = {

  1295.     .name           = "asf",

  1296.     .long_name      = NULL_IF_CONFIG_SMALL("ASF format"),

  1297.     .priv_data_size = sizeof(ASFContext),

  1298.     .read_probe     = asf_probe,

  1299.     .read_header    = asf_read_header,

  1300.     .read_packet    = asf_read_packet,

  1301.     .read_close     = asf_read_close,

  1302.     .read_seek      = asf_read_seek,

  1303.     .read_timestamp = asf_read_pts,

  1304.     .flags          = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,

  1305. };