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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. static const ff_asf_guid index_guid = {

  85.     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb

  86. };

  87. 

  88. #ifdef DEBUG

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

  90.     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2

  91. };

  92. 

  93. #define PRINT_IF_GUID(g,cmp) \

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

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

  96. 

  97. static void print_guid(const ff_asf_guid *g)

  98. {

  99.     int i;

  100.     PRINT_IF_GUID(g, ff_asf_header);

  101.     else PRINT_IF_GUID(g, ff_asf_file_header);

  102.     else PRINT_IF_GUID(g, ff_asf_stream_header);

  103.     else PRINT_IF_GUID(g, ff_asf_audio_stream);

  104.     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);

  105.     else PRINT_IF_GUID(g, ff_asf_video_stream);

  106.     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);

  107.     else PRINT_IF_GUID(g, ff_asf_command_stream);

  108.     else PRINT_IF_GUID(g, ff_asf_comment_header);

  109.     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);

  110.     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);

  111.     else PRINT_IF_GUID(g, ff_asf_data_header);

  112.     else PRINT_IF_GUID(g, index_guid);

  113.     else PRINT_IF_GUID(g, ff_asf_head1_guid);

  114.     else PRINT_IF_GUID(g, ff_asf_head2_guid);

  115.     else PRINT_IF_GUID(g, ff_asf_my_guid);

  116.     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);

  117.     else PRINT_IF_GUID(g, ff_asf_extended_content_header);

  118.     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);

  119.     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);

  120.     else PRINT_IF_GUID(g, ff_asf_metadata_header);

  121.     else PRINT_IF_GUID(g, ff_asf_marker_header);

  122.     else PRINT_IF_GUID(g, stream_bitrate_guid);

  123.     else PRINT_IF_GUID(g, ff_asf_language_guid);

  124.     else

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

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

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

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

  129. }

  130. #undef PRINT_IF_GUID

  131. #else

  132. #define print_guid(g)

  133. #endif

  134. 

  135. static int asf_probe(AVProbeData *pd)

  136. {

  137.     /* check file header */

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

  139.         return AVPROBE_SCORE_MAX;

  140.     else

  141.         return 0;

  142. }

  143. 

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

  145.     switch(type){

  146.         case 2: return avio_rl32(pb);

  147.         case 3: return avio_rl32(pb);

  148.         case 4: return avio_rl64(pb);

  149.         case 5: return avio_rl16(pb);

  150.         default:return INT_MIN;

  151.     }

  152. }

  153. 

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

  155. {

  156.     char *value;

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

  158. 

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

  160.         return;

  161. 

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

  163.     if (!value)

  164.         goto finish;

  165. 

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

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

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

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

  170.         value[len]=0;

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

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

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

  174.     } else {

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

  176.         goto finish;

  177.     }

  178.     if (*value)

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

  180. finish:

  181.     av_freep(&value);

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

  183. }

  184. 

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

  186. {

  187.     ASFContext *asf = s->priv_data;

  188.     AVIOContext *pb = s->pb;

  189. 

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

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

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

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

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

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

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

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

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

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

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

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

  202.         return AVERROR_INVALIDDATA;

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

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

  205. 

  206.     return 0;

  207. }

  208. 

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

  210. {

  211.     ASFContext *asf = s->priv_data;

  212.     AVIOContext *pb = s->pb;

  213.     AVStream *st;

  214.     ASFStream *asf_st;

  215.     ff_asf_guid g;

  216.     enum AVMediaType type;

  217.     int type_specific_size, sizeX;

  218.     unsigned int tag1;

  219.     int64_t pos1, pos2, start_time;

  220.     int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  221. 

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

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

  224.         return AVERROR(EINVAL);

  225.     }

  226. 

  227.     pos1 = avio_tell(pb);

  228. 

  229.     st = avformat_new_stream(s, NULL);

  230.     if (!st)

  231.         return AVERROR(ENOMEM);

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

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

  234.     if (!asf_st)

  235.         return AVERROR(ENOMEM);

  236.     st->priv_data = asf_st;

  237.     start_time = asf->hdr.preroll;

  238. 

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

  240. 

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

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

  243.             (10000000 / 1000) - start_time;

  244.     }

  245.     ff_get_guid(pb, &g);

  246. 

  247.     test_for_ext_stream_audio = 0;

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

  249.         type = AVMEDIA_TYPE_AUDIO;

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

  251.         type = AVMEDIA_TYPE_VIDEO;

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

  253.         type = AVMEDIA_TYPE_VIDEO;

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

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

  256.         type = AVMEDIA_TYPE_DATA;

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

  258.         test_for_ext_stream_audio = 1;

  259.         type = AVMEDIA_TYPE_UNKNOWN;

  260.     } else {

  261.         return -1;

  262.     }

  263.     ff_get_guid(pb, &g);

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

  265.     type_specific_size = avio_rl32(pb);

  266.     avio_rl32(pb);

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

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

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

  270. 

  271.     avio_rl32(pb);

  272. 

  273.     if (test_for_ext_stream_audio) {

  274.         ff_get_guid(pb, &g);

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

  276.             type = AVMEDIA_TYPE_AUDIO;

  277.             is_dvr_ms_audio=1;

  278.             ff_get_guid(pb, &g);

  279.             avio_rl32(pb);

  280.             avio_rl32(pb);

  281.             avio_rl32(pb);

  282.             ff_get_guid(pb, &g);

  283.             avio_rl32(pb);

  284.         }

  285.     }

  286. 

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

  288.     if (type == AVMEDIA_TYPE_AUDIO) {

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

  290.         if (ret < 0)

  291.             return ret;

  292.         if (is_dvr_ms_audio) {

  293.             // codec_id and codec_tag are unreliable in dvr_ms

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

  295.             st->request_probe= 1;

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

  297.         }

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

  299.             st->need_parsing = AVSTREAM_PARSE_NONE;

  300.         } else {

  301.             st->need_parsing = AVSTREAM_PARSE_FULL;

  302.         }

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

  304.         pos2 = avio_tell(pb);

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

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

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

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

  309.             avio_rl16(pb); //ds_data_size

  310.             avio_r8(pb);   //ds_silence_data

  311.         }

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

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

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

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

  316.             if (!asf_st->ds_chunk_size

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

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

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

  320.         }

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

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

  323.         avio_rl32(pb);

  324.         avio_rl32(pb);

  325.         avio_r8(pb);

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

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

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

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

  330.         /* not available for asf */

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

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

  333.         tag1 = avio_rl32(pb);

  334.         avio_skip(pb, 20);

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

  336.         if (sizeX > 40) {

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

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

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

  340.         }

  341. 

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

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

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

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

  346. #if HAVE_BIGENDIAN

  347.             int i;

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

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

  350. #else

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

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

  353. #endif

  354.             asf_st->palette_changed = 1;

  355.         }

  356. 

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

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

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

  360.             st->need_parsing = AVSTREAM_PARSE_FULL;

  361.             // 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

  362.             st->codec->width  =

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

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

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

  366.         }

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

  368.             st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;

  369.     }

  370.     pos2 = avio_tell(pb);

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

  372. 

  373.     return 0;

  374. }

  375. 

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

  377. {

  378.     ASFContext *asf = s->priv_data;

  379.     AVIOContext *pb = s->pb;

  380.     ff_asf_guid g;

  381.     int ext_len, payload_ext_ct, stream_ct, i;

  382.     uint32_t leak_rate, stream_num;

  383.     unsigned int stream_languageid_index;

  384. 

  385.     avio_rl64(pb); // starttime

  386.     avio_rl64(pb); // endtime

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

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

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

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

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

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

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

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

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

  396. 

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

  398.     if (stream_num < 128)

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

  400. 

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

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

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

  404. 

  405.     if (stream_num < 128)

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

  407. 

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

  409.         avio_rl16(pb);

  410.         ext_len = avio_rl16(pb);

  411.         avio_skip(pb, ext_len);

  412.     }

  413. 

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

  415.         ff_get_guid(pb, &g);

  416.         avio_skip(pb, 2);

  417.         ext_len=avio_rl32(pb);

  418.         avio_skip(pb, ext_len);

  419.     }

  420. 

  421.     return 0;

  422. }

  423. 

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

  425. {

  426.     AVIOContext *pb = s->pb;

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

  428. 

  429.     len1 = avio_rl16(pb);

  430.     len2 = avio_rl16(pb);

  431.     len3 = avio_rl16(pb);

  432.     len4 = avio_rl16(pb);

  433.     len5 = avio_rl16(pb);

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

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

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

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

  438.     avio_skip(pb, len5);

  439. 

  440.     return 0;

  441. }

  442. 

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

  444. {

  445.     AVIOContext *pb = s->pb;

  446.     ASFContext *asf = s->priv_data;

  447.     int desc_count, i, ret;

  448. 

  449.     desc_count = avio_rl16(pb);

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

  451.         int name_len,value_type,value_len;

  452.         char name[1024];

  453. 

  454.         name_len = avio_rl16(pb);

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

  456.             name_len += 1;

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

  458.             avio_skip(pb, name_len - ret);

  459.         value_type = avio_rl16(pb);

  460.         value_len  = avio_rl16(pb);

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

  462.             value_len += 1;

  463.         /**

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

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

  466.          */

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

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

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

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

  471.         } else

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

  473.     }

  474. 

  475.     return 0;

  476. }

  477. 

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

  479. {

  480.     AVIOContext *pb = s->pb;

  481.     ASFContext *asf = s->priv_data;

  482.     int j, ret;

  483.     int stream_count = avio_rl16(pb);

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

  485.         char lang[6];

  486.         unsigned int lang_len = avio_r8(pb);

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

  488.             avio_skip(pb, lang_len - ret);

  489.         if (j < 128)

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

  491.     }

  492. 

  493.     return 0;

  494. }

  495. 

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

  497. {

  498.     AVIOContext *pb = s->pb;

  499.     ASFContext *asf = s->priv_data;

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

  501.     int ret, i;

  502.     n = avio_rl16(pb);

  503. 

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

  505.         char name[1024];

  506. 

  507.         avio_rl16(pb); //lang_list_index

  508.         stream_num= avio_rl16(pb);

  509.         name_len=   avio_rl16(pb);

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

  511.         value_len=  avio_rl32(pb);

  512. 

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

  514.             avio_skip(pb, name_len - ret);

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

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

  517.         avio_skip(pb, value_len - 2);

  518. 

  519.         if(stream_num<128){

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

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

  522.         }

  523.     }

  524. 

  525.     return 0;

  526. }

  527. 

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

  529. {

  530.     AVIOContext *pb = s->pb;

  531.     int i, count, name_len, ret;

  532.     char name[1024];

  533. 

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

  535.     avio_rl64(pb);            // ...

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

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

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

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

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

  541.     }

  542. 

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

  544.         int64_t pres_time;

  545.         int name_len;

  546. 

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

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

  549.         avio_rl16(pb);             // entry length

  550.         avio_rl32(pb);             // send time

  551.         avio_rl32(pb);             // flags

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

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

  554.             avio_skip(pb, name_len - ret);

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

  556.     }

  557. 

  558.     return 0;

  559. }

  560. 

  561. static int asf_read_header(AVFormatContext *s)

  562. {

  563.     ASFContext *asf = s->priv_data;

  564.     ff_asf_guid g;

  565.     AVIOContext *pb = s->pb;

  566.     int i;

  567.     int64_t gsize;

  568. 

  569.     ff_get_guid(pb, &g);

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

  571.         return -1;

  572.     avio_rl64(pb);

  573.     avio_rl32(pb);

  574.     avio_r8(pb);

  575.     avio_r8(pb);

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

  577.     for(;;) {

  578.         uint64_t gpos= avio_tell(pb);

  579.         ff_get_guid(pb, &g);

  580.         gsize = avio_rl64(pb);

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

  582.         print_guid(&g);

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

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

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

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

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

  588.                 asf->data_object_size = gsize - 24;

  589.             } else {

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

  591.             }

  592.             break;

  593.         }

  594.         if (gsize < 24)

  595.             return -1;

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

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

  598.             if (ret < 0)

  599.                 return ret;

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

  601.             asf_read_stream_properties(s, gsize);

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

  603.             asf_read_content_desc(s, gsize);

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

  605.             asf_read_language_list(s, gsize);

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

  607.             asf_read_ext_content_desc(s, gsize);

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

  609.             asf_read_metadata(s, gsize);

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

  611.             asf_read_ext_stream_properties(s, gsize);

  612. 

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

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

  615.             continue;

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

  617.             ff_get_guid(pb, &g);

  618.             avio_skip(pb, 6);

  619.             continue;

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

  621.             asf_read_marker(s, gsize);

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

  623.             return -1;

  624.         } else {

  625.             if (!s->keylen) {

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

  627.                     unsigned int len;

  628.                     AVPacket pkt;

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

  630.                     len= avio_rl32(pb);

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

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

  633.                     len= avio_rl32(pb);

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

  635.                     len= avio_rl32(pb);

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

  637.                     len= avio_rl32(pb);

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

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

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

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

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

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

  644.                 }

  645.             }

  646.         }

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

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

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

  650.     }

  651.     ff_get_guid(pb, &g);

  652.     avio_rl64(pb);

  653.     avio_r8(pb);

  654.     avio_r8(pb);

  655.     if (url_feof(pb))

  656.         return -1;

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

  658.     asf->packet_size_left = 0;

  659. 

  660. 

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

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

  663.         if(stream_num>=0){

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

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

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

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

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

  669.                           &st->sample_aspect_ratio.den,

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

  671.             } 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.

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

  673.                           &st->sample_aspect_ratio.den,

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

  675. 

  676. //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);

  677. 

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

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

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

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

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

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

  684.                     if (iso6392)

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

  686.                 }

  687.             }

  688.         }

  689.     }

  690. 

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

  692. 

  693.     return 0;

  694. }

  695. 

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

  697.     switch (bits & 3) \

  698.     { \

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

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

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

  702.     default: var = defval; break; \

  703.     }

  704. 

  705. /**

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

  707.  * @param s demux context

  708.  * @param pb context to read data from

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

  710.  */

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

  712. {

  713.     ASFContext *asf = s->priv_data;

  714.     uint32_t packet_length, padsize;

  715.     int rsize = 8;

  716.     int c, d, e, off;

  717. 

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

  719.     off= 32768;

  720.     if (s->packet_size > 0)

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

  722. 

  723.     c=d=e=-1;

  724.     while(off-- > 0){

  725.         c=d; d=e;

  726.         e= avio_r8(pb);

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

  728.             break;

  729.     }

  730. 

  731.     if (c != 0x82) {

  732.         /**

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

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

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

  736.          * the stream.

  737.          */

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

  739.             return AVERROR(EAGAIN);

  740.         if (!url_feof(pb))

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

  742.     }

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

  744.         if (d || e) {

  745.             if (!url_feof(pb))

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

  747.             return -1;

  748.         }

  749.         c= avio_r8(pb);

  750.         d= avio_r8(pb);

  751.         rsize+=3;

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

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

  754.     }

  755. 

  756.     asf->packet_flags    = c;

  757.     asf->packet_property = d;

  758. 

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

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

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

  762. 

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

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

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

  766.         return -1;

  767.     }

  768.     if(padsize >= packet_length){

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

  770.         return -1;

  771.     }

  772. 

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

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

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

  776. 

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

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

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

  780.     } else {

  781.         asf->packet_segments = 1;

  782.         asf->packet_segsizetype = 0x80;

  783.     }

  784.     if (rsize > packet_length - padsize) {

  785.         asf->packet_size_left = 0;

  786.         av_log(s, AV_LOG_ERROR,

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

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

  789.         return -1;

  790.     }

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

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

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

  794.     asf->packet_padsize = padsize;

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

  796.     return 0;

  797. }

  798. 

  799. /**

  800.  *

  801.  * @return <0 if error

  802.  */

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

  804.     ASFContext *asf = s->priv_data;

  805.     int rsize = 1;

  806.     int num = avio_r8(pb);

  807.     int64_t ts0, ts1 av_unused;

  808. 

  809.     asf->packet_segments--;

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

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

  812.     // sequence should be ignored!

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

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

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

  816. //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);

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

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

  819.         return -1;

  820.     }

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

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

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

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

  825.             return -1;

  826.         }

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

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

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

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

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

  832.             avio_skip(pb, 10);

  833.             ts0= avio_rl64(pb);

  834.             ts1= avio_rl64(pb);

  835.             avio_skip(pb, 12);

  836.             avio_rl32(pb);

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

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

  839.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  840.         }else

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

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

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

  844.         // multipacket - frag_offset is beginning timestamp

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

  846.         asf->packet_frag_offset = 0;

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

  848. 

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

  850.         rsize++;

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

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

  853.         return -1;

  854.     }

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

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

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

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

  859.             return -1;

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

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

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

  863.                 return -1;

  864.             } else {

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

  866.                 asf->packet_size_left += diff;

  867.                 asf->packet_padsize   -= diff;

  868.             }

  869.         }

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

  871.     } else {

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

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

  874.     }

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

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

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

  878.             return -1;

  879.     }

  880.     asf->packet_size_left -= rsize;

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

  882. 

  883.     return 0;

  884. }

  885. 

  886. /**

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

  888.  * with asf_get_packet()).

  889.  * @param s demux context

  890.  * @param pb context to read data from

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

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

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

  894.  */

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

  896. {

  897.     ASFContext *asf = s->priv_data;

  898.     ASFStream *asf_st = 0;

  899.     for (;;) {

  900.         int ret;

  901.         if(url_feof(pb))

  902.             return AVERROR_EOF;

  903.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  908.             assert(ret>=0);

  909.             /* fail safe */

  910.             avio_skip(pb, ret);

  911. 

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

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

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

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

  916.             return 1;

  917.         }

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

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

  920.                 asf->packet_segments= 0;

  921.                 continue;

  922.             }

  923.             if (asf->stream_index < 0

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

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

  926.                 ) {

  927.                 asf->packet_time_start = 0;

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

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

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

  931.                 if(asf->stream_index < 0)

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

  933.                 continue;

  934.             }

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

  936.         }

  937.         asf_st = asf->asf_st;

  938. 

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

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

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

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

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

  944.             asf->packet_size_left--;

  945.             asf->packet_multi_size--;

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

  947.             {

  948.                 asf->packet_time_start = 0;

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

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

  951.                 continue;

  952.             }

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

  954.             //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);

  955.         }

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

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

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

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

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

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

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

  963.         }

  964. 

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

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

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

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

  969.                 asf_st->frag_offset = 0;

  970.                 av_free_packet(&asf_st->pkt);

  971.             }

  972.             /* new packet */

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

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

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

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

  977.             asf_st->pkt.pos =

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

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

  980.                 uint8_t *pal;

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

  982.                                               AVPALETTE_SIZE);

  983.                 if (!pal) {

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

  985.                 } else {

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

  987.                     asf_st->palette_changed = 0;

  988.                 }

  989.             }

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

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

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

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

  994.                 asf->packet_key_frame = 1;

  995.             if (asf->packet_key_frame)

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

  997.         }

  998. 

  999.         /* read data */

  1000.         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",

  1001.         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,

  1002.         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);

  1003.         asf->packet_size_left -= asf->packet_frag_size;

  1004.         if (asf->packet_size_left < 0)

  1005.             continue;

  1006. 

  1007.         if(   asf->packet_frag_offset >= asf_st->pkt.size

  1008.            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){

  1009.             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",

  1010.                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);

  1011.             continue;

  1012.         }

  1013. 

  1014.         ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,

  1015.                          asf->packet_frag_size);

  1016.         if (ret != asf->packet_frag_size) {

  1017.             if (ret < 0 || asf->packet_frag_offset + ret == 0)

  1018.                 return ret < 0 ? ret : AVERROR_EOF;

  1019.             if (asf_st->ds_span > 1) {

  1020.                 // scrambling, we can either drop it completely or fill the remainder

  1021.                 // TODO: should we fill the whole packet instead of just the current

  1022.                 // fragment?

  1023.                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,

  1024.                        asf->packet_frag_size - ret);

  1025.                 ret = asf->packet_frag_size;

  1026.             } else

  1027.                 // no scrambling, so we can return partial packets

  1028.                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);

  1029.         }

  1030.         if (s->key && s->keylen == 20)

  1031.             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,

  1032.                             ret);

  1033.         asf_st->frag_offset += ret;

  1034.         /* test if whole packet is read */

  1035.         if (asf_st->frag_offset == asf_st->pkt.size) {

  1036.             //workaround for macroshit radio DVR-MS files

  1037.             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO

  1038.                && asf_st->pkt.size > 100){

  1039.                 int i;

  1040.                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);

  1041.                 if(i == asf_st->pkt.size){

  1042.                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");

  1043.                     asf_st->frag_offset = 0;

  1044.                     av_free_packet(&asf_st->pkt);

  1045.                     continue;

  1046.                 }

  1047.             }

  1048. 

  1049.             /* return packet */

  1050.             if (asf_st->ds_span > 1) {

  1051.               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){

  1052.                     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);

  1053.               }else{

  1054.                 /* packet descrambling */

  1055.                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);

  1056.                 if (newdata) {

  1057.                     int offset = 0;

  1058.                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

  1059.                     while (offset < asf_st->pkt.size) {

  1060.                         int off = offset / asf_st->ds_chunk_size;

  1061.                         int row = off / asf_st->ds_span;

  1062.                         int col = off % asf_st->ds_span;

  1063.                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;

  1064.                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);

  1065. 

  1066.                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);

  1067.                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);

  1068.                         memcpy(newdata + offset,

  1069.                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,

  1070.                                asf_st->ds_chunk_size);

  1071.                         offset += asf_st->ds_chunk_size;

  1072.                     }

  1073.                     av_free(asf_st->pkt.data);

  1074.                     asf_st->pkt.data = newdata;

  1075.                 }

  1076.               }

  1077.             }

  1078.             asf_st->frag_offset = 0;

  1079.             *pkt= asf_st->pkt;

  1080.             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);

  1081.             asf_st->pkt.size = 0;

  1082.             asf_st->pkt.data = 0;

  1083.             asf_st->pkt.side_data_elems = 0;

  1084.             asf_st->pkt.side_data = NULL;

  1085.             break; // packet completed

  1086.         }

  1087.     }

  1088.     return 0;

  1089. }

  1090. 

  1091. static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)

  1092. {

  1093.     ASFContext *asf = s->priv_data;

  1094. 

  1095.     for (;;) {

  1096.         int ret;

  1097. 

  1098.         /* parse cached packets, if any */

  1099.         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)

  1100.             return ret;

  1101.         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)

  1102.             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);

  1103.         asf->packet_time_start = 0;

  1104.     }

  1105. }

  1106. 

  1107. // Added to support seeking after packets have been read

  1108. // If information is not reset, read_packet fails due to

  1109. // leftover information from previous reads

  1110. static void asf_reset_header(AVFormatContext *s)

  1111. {

  1112.     ASFContext *asf = s->priv_data;

  1113.     ASFStream *asf_st;

  1114.     int i;

  1115. 

  1116.     asf->packet_size_left = 0;

  1117.     asf->packet_segments = 0;

  1118.     asf->packet_flags = 0;

  1119.     asf->packet_property = 0;

  1120.     asf->packet_timestamp = 0;

  1121.     asf->packet_segsizetype = 0;

  1122.     asf->packet_segments = 0;

  1123.     asf->packet_seq = 0;

  1124.     asf->packet_replic_size = 0;

  1125.     asf->packet_key_frame = 0;

  1126.     asf->packet_padsize = 0;

  1127.     asf->packet_frag_offset = 0;

  1128.     asf->packet_frag_size = 0;

  1129.     asf->packet_frag_timestamp = 0;

  1130.     asf->packet_multi_size = 0;

  1131.     asf->packet_obj_size = 0;

  1132.     asf->packet_time_delta = 0;

  1133.     asf->packet_time_start = 0;

  1134. 

  1135.     for(i=0; i<s->nb_streams; i++){

  1136.         asf_st= s->streams[i]->priv_data;

  1137.         av_free_packet(&asf_st->pkt);

  1138.         asf_st->frag_offset=0;

  1139.         asf_st->seq=0;

  1140.     }

  1141.     asf->asf_st= NULL;

  1142. }

  1143. 

  1144. static int asf_read_close(AVFormatContext *s)

  1145. {

  1146.     asf_reset_header(s);

  1147. 

  1148.     return 0;

  1149. }

  1150. 

  1151. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  1152. {

  1153.     AVPacket pkt1, *pkt = &pkt1;

  1154.     ASFStream *asf_st;

  1155.     int64_t pts;

  1156.     int64_t pos= *ppos;

  1157.     int i;

  1158.     int64_t start_pos[ASF_MAX_STREAMS];

  1159. 

  1160.     for(i=0; i<s->nb_streams; i++){

  1161.         start_pos[i]= pos;

  1162.     }

  1163. 

  1164.     if (s->packet_size > 0)

  1165.         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;

  1166.     *ppos= pos;

  1167.     if (avio_seek(s->pb, pos, SEEK_SET) < 0)

  1168.         return AV_NOPTS_VALUE;

  1169. 

  1170. //printf("asf_read_pts\n");

  1171.     asf_reset_header(s);

  1172.     for(;;){

  1173.         if (av_read_frame(s, pkt) < 0){

  1174.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1175.             return AV_NOPTS_VALUE;

  1176.         }

  1177. 

  1178.         pts = pkt->dts;

  1179. 

  1180.         av_free_packet(pkt);

  1181.         if(pkt->flags&AV_PKT_FLAG_KEY){

  1182.             i= pkt->stream_index;

  1183. 

  1184.             asf_st= s->streams[i]->priv_data;

  1185. 

  1186. //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);

  1187.             pos= asf_st->packet_pos;

  1188. 

  1189.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1190.             start_pos[i]= asf_st->packet_pos + 1;

  1191. 

  1192.             if(pkt->stream_index == stream_index)

  1193.                break;

  1194.         }

  1195.     }

  1196. 

  1197.     *ppos= pos;

  1198. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1199. 

  1200.     return pts;

  1201. }

  1202. 

  1203. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1204. {

  1205.     ff_asf_guid g;

  1206.     ASFContext *asf = s->priv_data;

  1207.     int64_t current_pos= avio_tell(s->pb);

  1208. 

  1209.     if(avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET) < 0) {

  1210.         asf->index_read= -1;

  1211.         return;

  1212.     }

  1213. 

  1214.     ff_get_guid(s->pb, &g);

  1215. 

  1216.     /* the data object can be followed by other top-level objects,

  1217.        skip them until the simple index object is reached */

  1218.     while (ff_guidcmp(&g, &index_guid)) {

  1219.         int64_t gsize= avio_rl64(s->pb);

  1220.         if (gsize < 24 || url_feof(s->pb)) {

  1221.             avio_seek(s->pb, current_pos, SEEK_SET);

  1222.             asf->index_read= -1;

  1223.             return;

  1224.         }

  1225.         avio_skip(s->pb, gsize-24);

  1226.         ff_get_guid(s->pb, &g);

  1227.     }

  1228. 

  1229.     {

  1230.         int64_t itime, last_pos=-1;

  1231.         int pct, ict;

  1232.         int i;

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

  1234.         ff_get_guid(s->pb, &g);

  1235.         itime=avio_rl64(s->pb);

  1236.         pct=avio_rl32(s->pb);

  1237.         ict=avio_rl32(s->pb);

  1238.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1239. 

  1240.         for (i=0;i<ict;i++){

  1241.             int pktnum=avio_rl32(s->pb);

  1242.             int pktct =avio_rl16(s->pb);

  1243.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1244.             int64_t index_pts= FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);

  1245. 

  1246.             if(pos != last_pos){

  1247.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d  pts: %"PRId64"\n", pktnum, pktct, index_pts);

  1248.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1249.             last_pos=pos;

  1250.             }

  1251.         }

  1252.         asf->index_read= ict > 0;

  1253.     }

  1254.     avio_seek(s->pb, current_pos, SEEK_SET);

  1255. }

  1256. 

  1257. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1258. {

  1259.     ASFContext *asf = s->priv_data;

  1260.     AVStream *st = s->streams[stream_index];

  1261. 

  1262.     if (s->packet_size <= 0)

  1263.         return -1;

  1264. 

  1265.     /* Try using the protocol's read_seek if available */

  1266.     if(s->pb) {

  1267.         int ret = avio_seek_time(s->pb, stream_index, pts, flags);

  1268.         if(ret >= 0)

  1269.             asf_reset_header(s);

  1270.         if (ret != AVERROR(ENOSYS))

  1271.             return ret;

  1272.     }

  1273. 

  1274.     if (!asf->index_read)

  1275.         asf_build_simple_index(s, stream_index);

  1276. 

  1277.     if((asf->index_read > 0 && st->index_entries)){

  1278.         int index= av_index_search_timestamp(st, pts, flags);

  1279.         if(index >= 0) {

  1280.             /* find the position */

  1281.             uint64_t pos = st->index_entries[index].pos;

  1282. 

  1283.             /* do the seek */

  1284.             av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1285.             if(avio_seek(s->pb, pos, SEEK_SET) < 0)

  1286.                 return -1;

  1287.             asf_reset_header(s);

  1288.             return 0;

  1289.         }

  1290.     }

  1291.     /* no index or seeking by index failed */

  1292.     if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)

  1293.         return -1;

  1294.     asf_reset_header(s);

  1295.     return 0;

  1296. }

  1297. 

  1298. AVInputFormat ff_asf_demuxer = {

  1299.     .name           = "asf",

  1300.     .long_name      = NULL_IF_CONFIG_SMALL("ASF format"),

  1301.     .priv_data_size = sizeof(ASFContext),

  1302.     .read_probe     = asf_probe,

  1303.     .read_header    = asf_read_header,

  1304.     .read_packet    = asf_read_packet,

  1305.     .read_close     = asf_read_close,

  1306.     .read_seek      = asf_read_seek,

  1307.     .read_timestamp = asf_read_pts,

  1308.     .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,

  1309. };