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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 Libav.

  6.  *

  7.  * Libav 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.  * Libav 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 Libav; if not, write to the Free Software

  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  20.  */

  21. 

  22. //#define DEBUG

  23. 

  24. #include "libavutil/bswap.h"

  25. #include "libavutil/common.h"

  26. #include "libavutil/avstring.h"

  27. #include "libavutil/dict.h"

  28. #include "libavutil/mathematics.h"

  29. #include "libavutil/opt.h"

  30. #include "avformat.h"

  31. #include "internal.h"

  32. #include "avio_internal.h"

  33. #include "riff.h"

  34. #include "asf.h"

  35. #include "asfcrypt.h"

  36. #include "avlanguage.h"

  37. 

  38. typedef struct {

  39.     const AVClass *class;

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

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

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

  43.     AVRational dar[128];

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

  45.     /* non streamed additonnal info */

  46.     /* packet filling */

  47.     int packet_size_left;

  48.     /* only for reading */

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

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

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

  52.     int index_read;

  53. 

  54.     ASFMainHeader hdr;

  55. 

  56.     int packet_flags;

  57.     int packet_property;

  58.     int packet_timestamp;

  59.     int packet_segsizetype;

  60.     int packet_segments;

  61.     int packet_seq;

  62.     int packet_replic_size;

  63.     int packet_key_frame;

  64.     int packet_padsize;

  65.     unsigned int packet_frag_offset;

  66.     unsigned int packet_frag_size;

  67.     int64_t packet_frag_timestamp;

  68.     int packet_multi_size;

  69.     int packet_obj_size;

  70.     int packet_time_delta;

  71.     int packet_time_start;

  72.     int64_t packet_pos;

  73. 

  74.     int stream_index;

  75. 

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

  77. 

  78.     int no_resync_search;

  79. } ASFContext;

  80. 

  81. static const AVOption options[] = {

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

  83.     { NULL },

  84. };

  85. 

  86. static const AVClass asf_class = {

  87.     .class_name = "asf demuxer",

  88.     .item_name  = av_default_item_name,

  89.     .option     = options,

  90.     .version    = LIBAVUTIL_VERSION_INT,

  91. };

  92. 

  93. #undef NDEBUG

  94. #include <assert.h>

  95. 

  96. #define ASF_MAX_STREAMS 127

  97. #define FRAME_HEADER_SIZE 17

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

  99. 

  100. static const ff_asf_guid index_guid = {

  101.     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb

  102. };

  103. 

  104. #ifdef DEBUG

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

  106.     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2

  107. };

  108. 

  109. #define PRINT_IF_GUID(g,cmp) \

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

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

  112. 

  113. static void print_guid(const ff_asf_guid *g)

  114. {

  115.     int i;

  116.     PRINT_IF_GUID(g, ff_asf_header);

  117.     else PRINT_IF_GUID(g, ff_asf_file_header);

  118.     else PRINT_IF_GUID(g, ff_asf_stream_header);

  119.     else PRINT_IF_GUID(g, ff_asf_audio_stream);

  120.     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);

  121.     else PRINT_IF_GUID(g, ff_asf_video_stream);

  122.     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);

  123.     else PRINT_IF_GUID(g, ff_asf_command_stream);

  124.     else PRINT_IF_GUID(g, ff_asf_comment_header);

  125.     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);

  126.     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);

  127.     else PRINT_IF_GUID(g, ff_asf_data_header);

  128.     else PRINT_IF_GUID(g, index_guid);

  129.     else PRINT_IF_GUID(g, ff_asf_head1_guid);

  130.     else PRINT_IF_GUID(g, ff_asf_head2_guid);

  131.     else PRINT_IF_GUID(g, ff_asf_my_guid);

  132.     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);

  133.     else PRINT_IF_GUID(g, ff_asf_extended_content_header);

  134.     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);

  135.     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);

  136.     else PRINT_IF_GUID(g, ff_asf_metadata_header);

  137.     else PRINT_IF_GUID(g, ff_asf_marker_header);

  138.     else PRINT_IF_GUID(g, stream_bitrate_guid);

  139.     else PRINT_IF_GUID(g, ff_asf_language_guid);

  140.     else

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

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

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

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

  145. }

  146. #undef PRINT_IF_GUID

  147. #else

  148. #define print_guid(g)

  149. #endif

  150. 

  151. void ff_get_guid(AVIOContext *s, ff_asf_guid *g)

  152. {

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

  154.     avio_read(s, *g, sizeof(*g));

  155. }

  156. 

  157. static int asf_probe(AVProbeData *pd)

  158. {

  159.     /* check file header */

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

  161.         return AVPROBE_SCORE_MAX;

  162.     else

  163.         return 0;

  164. }

  165. 

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

  167.     switch(type){

  168.         case 2: return avio_rl32(pb);

  169.         case 3: return avio_rl32(pb);

  170.         case 4: return avio_rl64(pb);

  171.         case 5: return avio_rl16(pb);

  172.         default:return INT_MIN;

  173.     }

  174. }

  175. 

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

  177. {

  178.     char *value;

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

  180. 

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

  182.         return;

  183. 

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

  185.     if (!value)

  186.         goto finish;

  187. 

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

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

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

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

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

  193.     } else {

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

  195.         goto finish;

  196.     }

  197.     if (*value)

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

  199. finish:

  200.     av_freep(&value);

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

  202. }

  203. 

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

  205. {

  206.     ASFContext *asf = s->priv_data;

  207.     AVIOContext *pb = s->pb;

  208. 

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

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

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

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

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

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

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

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

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

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

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

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

  221.         return AVERROR_INVALIDDATA;

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

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

  224. 

  225.     return 0;

  226. }

  227. 

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

  229. {

  230.     ASFContext *asf = s->priv_data;

  231.     AVIOContext *pb = s->pb;

  232.     AVStream *st;

  233.     ASFStream *asf_st;

  234.     ff_asf_guid g;

  235.     enum AVMediaType type;

  236.     int type_specific_size, sizeX;

  237.     unsigned int tag1;

  238.     int64_t pos1, pos2, start_time;

  239.     int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  240. 

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

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

  243.         return AVERROR(EINVAL);

  244.     }

  245. 

  246.     pos1 = avio_tell(pb);

  247. 

  248.     st = avformat_new_stream(s, NULL);

  249.     if (!st)

  250.         return AVERROR(ENOMEM);

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

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

  253.     if (!asf_st)

  254.         return AVERROR(ENOMEM);

  255.     st->priv_data = asf_st;

  256.     st->start_time = 0;

  257.     start_time = asf->hdr.preroll;

  258. 

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

  260. 

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

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

  263.             (10000000 / 1000) - start_time;

  264.     }

  265.     ff_get_guid(pb, &g);

  266. 

  267.     test_for_ext_stream_audio = 0;

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

  269.         type = AVMEDIA_TYPE_AUDIO;

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

  271.         type = AVMEDIA_TYPE_VIDEO;

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

  273.         type = AVMEDIA_TYPE_VIDEO;

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

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

  276.         type = AVMEDIA_TYPE_DATA;

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

  278.         test_for_ext_stream_audio = 1;

  279.         type = AVMEDIA_TYPE_UNKNOWN;

  280.     } else {

  281.         return -1;

  282.     }

  283.     ff_get_guid(pb, &g);

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

  285.     type_specific_size = avio_rl32(pb);

  286.     avio_rl32(pb);

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

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

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

  290. 

  291.     avio_rl32(pb);

  292. 

  293.     if (test_for_ext_stream_audio) {

  294.         ff_get_guid(pb, &g);

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

  296.             type = AVMEDIA_TYPE_AUDIO;

  297.             is_dvr_ms_audio=1;

  298.             ff_get_guid(pb, &g);

  299.             avio_rl32(pb);

  300.             avio_rl32(pb);

  301.             avio_rl32(pb);

  302.             ff_get_guid(pb, &g);

  303.             avio_rl32(pb);

  304.         }

  305.     }

  306. 

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

  308.     if (type == AVMEDIA_TYPE_AUDIO) {

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

  310.         if (ret < 0)

  311.             return ret;

  312.         if (is_dvr_ms_audio) {

  313.             // codec_id and codec_tag are unreliable in dvr_ms

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

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

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

  317.         }

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

  319.             st->need_parsing = AVSTREAM_PARSE_NONE;

  320.         } else {

  321.             st->need_parsing = AVSTREAM_PARSE_FULL;

  322.         }

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

  324.         pos2 = avio_tell(pb);

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

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

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

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

  329.             avio_rl16(pb); //ds_data_size

  330.             avio_r8(pb);   //ds_silence_data

  331.         }

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

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

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

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

  336.             if (!asf_st->ds_chunk_size

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

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

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

  340.         }

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

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

  343.         avio_rl32(pb);

  344.         avio_rl32(pb);

  345.         avio_r8(pb);

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

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

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

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

  350.         /* not available for asf */

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

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

  353.         tag1 = avio_rl32(pb);

  354.         avio_skip(pb, 20);

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

  356.         if (sizeX > 40) {

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

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

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

  360.         }

  361. 

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

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

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

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

  366. #if HAVE_BIGENDIAN

  367.             int i;

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

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

  370. #else

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

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

  373. #endif

  374.             asf_st->palette_changed = 1;

  375.         }

  376. 

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

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

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

  380.             st->need_parsing = AVSTREAM_PARSE_FULL;

  381.             // 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

  382.             st->codec->width  =

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

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

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

  386.         }

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

  388.             st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;

  389.     }

  390.     pos2 = avio_tell(pb);

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

  392. 

  393.     return 0;

  394. }

  395. 

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

  397. {

  398.     ASFContext *asf = s->priv_data;

  399.     AVIOContext *pb = s->pb;

  400.     ff_asf_guid g;

  401.     int ext_len, payload_ext_ct, stream_ct, i;

  402.     uint32_t leak_rate, stream_num;

  403.     unsigned int stream_languageid_index;

  404. 

  405.     avio_rl64(pb); // starttime

  406.     avio_rl64(pb); // endtime

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

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

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

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

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

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

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

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

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

  416. 

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

  418.     if (stream_num < 128)

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

  420. 

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

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

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

  424. 

  425.     if (stream_num < 128)

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

  427. 

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

  429.         avio_rl16(pb);

  430.         ext_len = avio_rl16(pb);

  431.         avio_skip(pb, ext_len);

  432.     }

  433. 

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

  435.         ff_get_guid(pb, &g);

  436.         avio_skip(pb, 2);

  437.         ext_len=avio_rl32(pb);

  438.         avio_skip(pb, ext_len);

  439.     }

  440. 

  441.     return 0;

  442. }

  443. 

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

  445. {

  446.     AVIOContext *pb = s->pb;

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

  448. 

  449.     len1 = avio_rl16(pb);

  450.     len2 = avio_rl16(pb);

  451.     len3 = avio_rl16(pb);

  452.     len4 = avio_rl16(pb);

  453.     len5 = avio_rl16(pb);

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

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

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

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

  458.     avio_skip(pb, len5);

  459. 

  460.     return 0;

  461. }

  462. 

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

  464. {

  465.     AVIOContext *pb = s->pb;

  466.     ASFContext *asf = s->priv_data;

  467.     int desc_count, i, ret;

  468. 

  469.     desc_count = avio_rl16(pb);

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

  471.         int name_len,value_type,value_len;

  472.         char name[1024];

  473. 

  474.         name_len = avio_rl16(pb);

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

  476.             name_len += 1;

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

  478.             avio_skip(pb, name_len - ret);

  479.         value_type = avio_rl16(pb);

  480.         value_len  = avio_rl16(pb);

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

  482.             value_len += 1;

  483.         /**

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

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

  486.          */

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

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

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

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

  491.         } else

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

  493.     }

  494. 

  495.     return 0;

  496. }

  497. 

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

  499. {

  500.     AVIOContext *pb = s->pb;

  501.     ASFContext *asf = s->priv_data;

  502.     int j, ret;

  503.     int stream_count = avio_rl16(pb);

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

  505.         char lang[6];

  506.         unsigned int lang_len = avio_r8(pb);

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

  508.             avio_skip(pb, lang_len - ret);

  509.         if (j < 128)

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

  511.     }

  512. 

  513.     return 0;

  514. }

  515. 

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

  517. {

  518.     AVIOContext *pb = s->pb;

  519.     ASFContext *asf = s->priv_data;

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

  521.     int ret, i;

  522.     n = avio_rl16(pb);

  523. 

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

  525.         char name[1024];

  526. 

  527.         avio_rl16(pb); //lang_list_index

  528.         stream_num= avio_rl16(pb);

  529.         name_len=   avio_rl16(pb);

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

  531.         value_len=  avio_rl32(pb);

  532. 

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

  534.             avio_skip(pb, name_len - ret);

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

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

  537.         avio_skip(pb, value_len - 2);

  538. 

  539.         if(stream_num<128){

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

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

  542.         }

  543.     }

  544. 

  545.     return 0;

  546. }

  547. 

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

  549. {

  550.     AVIOContext *pb = s->pb;

  551.     int i, count, name_len, ret;

  552.     char name[1024];

  553. 

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

  555.     avio_rl64(pb);            // ...

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

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

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

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

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

  561.     }

  562. 

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

  564.         int64_t pres_time;

  565.         int name_len;

  566. 

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

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

  569.         avio_rl16(pb);             // entry length

  570.         avio_rl32(pb);             // send time

  571.         avio_rl32(pb);             // flags

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

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

  574.             avio_skip(pb, name_len - ret);

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

  576.     }

  577. 

  578.     return 0;

  579. }

  580. 

  581. static int asf_read_header(AVFormatContext *s)

  582. {

  583.     ASFContext *asf = s->priv_data;

  584.     ff_asf_guid g;

  585.     AVIOContext *pb = s->pb;

  586.     int i;

  587.     int64_t gsize;

  588. 

  589.     ff_get_guid(pb, &g);

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

  591.         return -1;

  592.     avio_rl64(pb);

  593.     avio_rl32(pb);

  594.     avio_r8(pb);

  595.     avio_r8(pb);

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

  597.     for(;;) {

  598.         uint64_t gpos= avio_tell(pb);

  599.         ff_get_guid(pb, &g);

  600.         gsize = avio_rl64(pb);

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

  602.         print_guid(&g);

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

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

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

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

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

  608.                 asf->data_object_size = gsize - 24;

  609.             } else {

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

  611.             }

  612.             break;

  613.         }

  614.         if (gsize < 24)

  615.             return -1;

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

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

  618.             if (ret < 0)

  619.                 return ret;

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

  621.             asf_read_stream_properties(s, gsize);

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

  623.             asf_read_content_desc(s, gsize);

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

  625.             asf_read_language_list(s, gsize);

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

  627.             asf_read_ext_content_desc(s, gsize);

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

  629.             asf_read_metadata(s, gsize);

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

  631.             asf_read_ext_stream_properties(s, gsize);

  632. 

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

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

  635.             continue;

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

  637.             ff_get_guid(pb, &g);

  638.             avio_skip(pb, 6);

  639.             continue;

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

  641.             asf_read_marker(s, gsize);

  642.         } else if (pb->eof_reached) {

  643.             return -1;

  644.         } else {

  645.             if (!s->keylen) {

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

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

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

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

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

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

  652.                 }

  653.             }

  654.         }

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

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

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

  658.     }

  659.     ff_get_guid(pb, &g);

  660.     avio_rl64(pb);

  661.     avio_r8(pb);

  662.     avio_r8(pb);

  663.     if (pb->eof_reached)

  664.         return -1;

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

  666.     asf->packet_size_left = 0;

  667. 

  668. 

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

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

  671.         if(stream_num>=0){

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

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

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

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

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

  677.                           &st->sample_aspect_ratio.den,

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

  679.             } 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.

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

  681.                           &st->sample_aspect_ratio.den,

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

  683. 

  684. //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);

  685. 

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

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

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

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

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

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

  692.                     if (iso6392)

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

  694.                 }

  695.             }

  696.         }

  697.     }

  698. 

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

  700. 

  701.     return 0;

  702. }

  703. 

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

  705.     switch (bits & 3) \

  706.     { \

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

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

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

  710.     default: var = defval; break; \

  711.     }

  712. 

  713. /**

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

  715.  * @param s demux context

  716.  * @param pb context to read data from

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

  718.  */

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

  720. {

  721.     ASFContext *asf = s->priv_data;

  722.     uint32_t packet_length, padsize;

  723.     int rsize = 8;

  724.     int c, d, e, off;

  725. 

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

  727.     off= 32768;

  728.     if (asf->no_resync_search)

  729.         off = 3;

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

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

  732. 

  733.     c=d=e=-1;

  734.     while(off-- > 0){

  735.         c=d; d=e;

  736.         e= avio_r8(pb);

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

  738.             break;

  739.     }

  740. 

  741.     if (c != 0x82) {

  742.         /**

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

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

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

  746.          * the stream.

  747.          */

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

  749.             return AVERROR(EAGAIN);

  750.         if (!pb->eof_reached)

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

  752.     }

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

  754.         if (d || e) {

  755.             if (!pb->eof_reached)

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

  757.             return -1;

  758.         }

  759.         c= avio_r8(pb);

  760.         d= avio_r8(pb);

  761.         rsize+=3;

  762.     } else if (!pb->eof_reached) {

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

  764.     }

  765. 

  766.     asf->packet_flags    = c;

  767.     asf->packet_property = d;

  768. 

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

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

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

  772. 

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

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

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

  776.         return -1;

  777.     }

  778.     if(padsize >= packet_length){

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

  780.         return -1;

  781.     }

  782. 

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

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

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

  786. 

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

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

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

  790.     } else {

  791.         asf->packet_segments = 1;

  792.         asf->packet_segsizetype = 0x80;

  793.     }

  794.     if (rsize > packet_length - padsize) {

  795.         asf->packet_size_left = 0;

  796.         av_log(s, AV_LOG_ERROR,

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

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

  799.         return -1;

  800.     }

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

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

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

  804.     asf->packet_padsize = padsize;

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

  806.     return 0;

  807. }

  808. 

  809. /**

  810.  *

  811.  * @return <0 if error

  812.  */

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

  814.     ASFContext *asf = s->priv_data;

  815.     int rsize = 1;

  816.     int num = avio_r8(pb);

  817.     int64_t ts0;

  818. 

  819.     asf->packet_segments--;

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

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

  822.     // sequence should be ignored!

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

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

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

  826. //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);

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

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

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

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

  831.             return -1;

  832.         }

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

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

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

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

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

  838.             avio_skip(pb, 10);

  839.             ts0= avio_rl64(pb);

  840.             avio_skip(pb, 8);;

  841.             avio_skip(pb, 12);

  842.             avio_rl32(pb);

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

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

  845.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  846.         }else

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

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

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

  850.         // multipacket - frag_offset is beginning timestamp

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

  852.         asf->packet_frag_offset = 0;

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

  854. 

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

  856.         rsize++;

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

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

  859.         return -1;

  860.     }

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

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

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

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

  865.             return -1;

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

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

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

  869.                 return -1;

  870.             } else {

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

  872.                 asf->packet_size_left += diff;

  873.                 asf->packet_padsize   -= diff;

  874.             }

  875.         }

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

  877.     } else {

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

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

  880.             return -1;

  881.         }

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

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

  884.     }

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

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

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

  888.             return -1;

  889.     }

  890.     asf->packet_size_left -= rsize;

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

  892. 

  893.     return 0;

  894. }

  895. 

  896. /**

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

  898.  * with asf_get_packet()).

  899.  * @param s demux context

  900.  * @param pb context to read data from

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

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

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

  904.  */

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

  906. {

  907.     ASFContext *asf = s->priv_data;

  908.     ASFStream *asf_st = 0;

  909.     for (;;) {

  910.         int ret;

  911.         if(pb->eof_reached)

  912.             return AVERROR_EOF;

  913.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  918.             assert(ret>=0);

  919.             /* fail safe */

  920.             avio_skip(pb, ret);

  921. 

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

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

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

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

  926.             return 1;

  927.         }

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

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

  930.                 asf->packet_segments= 0;

  931.                 continue;

  932.             }

  933.             if (asf->stream_index < 0

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

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

  936.                 ) {

  937.                 asf->packet_time_start = 0;

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

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

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

  941.                 if(asf->stream_index < 0)

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

  943.                 continue;

  944.             }

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

  946.         }

  947.         asf_st = asf->asf_st;

  948. 

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

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

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

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

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

  954.             asf->packet_size_left--;

  955.             asf->packet_multi_size--;

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

  957.             {

  958.                 asf->packet_time_start = 0;

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

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

  961.                 continue;

  962.             }

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

  964.             //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);

  965.         }

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

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

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

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

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

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

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

  973.         }

  974. 

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

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

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

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

  979.                 asf_st->frag_offset = 0;

  980.                 av_free_packet(&asf_st->pkt);

  981.             }

  982.             /* new packet */

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

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

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

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

  987.             asf_st->pkt.pos =

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

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

  990.                 uint8_t *pal;

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

  992.                                               AVPALETTE_SIZE);

  993.                 if (!pal) {

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

  995.                 } else {

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

  997.                     asf_st->palette_changed = 0;

  998.                 }

  999.             }

  1000. //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",

  1001. //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,

  1002. //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);

  1003.             if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)

  1004.                 asf->packet_key_frame = 1;

  1005.             if (asf->packet_key_frame)

  1006.                 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;

  1007.         }

  1008. 

  1009.         /* read data */

  1010.         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",

  1011.         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,

  1012.         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);

  1013.         asf->packet_size_left -= asf->packet_frag_size;

  1014.         if (asf->packet_size_left < 0)

  1015.             continue;

  1016. 

  1017.         if(   asf->packet_frag_offset >= asf_st->pkt.size

  1018.            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){

  1019.             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",

  1020.                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);

  1021.             continue;

  1022.         }

  1023. 

  1024.         ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,

  1025.                          asf->packet_frag_size);

  1026.         if (ret != asf->packet_frag_size) {

  1027.             if (ret < 0 || asf->packet_frag_offset + ret == 0)

  1028.                 return ret < 0 ? ret : AVERROR_EOF;

  1029.             if (asf_st->ds_span > 1) {

  1030.                 // scrambling, we can either drop it completely or fill the remainder

  1031.                 // TODO: should we fill the whole packet instead of just the current

  1032.                 // fragment?

  1033.                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,

  1034.                        asf->packet_frag_size - ret);

  1035.                 ret = asf->packet_frag_size;

  1036.             } else

  1037.                 // no scrambling, so we can return partial packets

  1038.                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);

  1039.         }

  1040.         if (s->key && s->keylen == 20)

  1041.             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,

  1042.                             ret);

  1043.         asf_st->frag_offset += ret;

  1044.         /* test if whole packet is read */

  1045.         if (asf_st->frag_offset == asf_st->pkt.size) {

  1046.             //workaround for macroshit radio DVR-MS files

  1047.             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO

  1048.                && asf_st->pkt.size > 100){

  1049.                 int i;

  1050.                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);

  1051.                 if(i == asf_st->pkt.size){

  1052.                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");

  1053.                     asf_st->frag_offset = 0;

  1054.                     av_free_packet(&asf_st->pkt);

  1055.                     continue;

  1056.                 }

  1057.             }

  1058. 

  1059.             /* return packet */

  1060.             if (asf_st->ds_span > 1) {

  1061.               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){

  1062.                     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);

  1063.               }else{

  1064.                 /* packet descrambling */

  1065.                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);

  1066.                 if (newdata) {

  1067.                     int offset = 0;

  1068.                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

  1069.                     while (offset < asf_st->pkt.size) {

  1070.                         int off = offset / asf_st->ds_chunk_size;

  1071.                         int row = off / asf_st->ds_span;

  1072.                         int col = off % asf_st->ds_span;

  1073.                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;

  1074.                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);

  1075. 

  1076.                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);

  1077.                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);

  1078.                         memcpy(newdata + offset,

  1079.                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,

  1080.                                asf_st->ds_chunk_size);

  1081.                         offset += asf_st->ds_chunk_size;

  1082.                     }

  1083.                     av_free(asf_st->pkt.data);

  1084.                     asf_st->pkt.data = newdata;

  1085.                 }

  1086.               }

  1087.             }

  1088.             asf_st->frag_offset = 0;

  1089.             *pkt= asf_st->pkt;

  1090.             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);

  1091.             asf_st->pkt.size = 0;

  1092.             asf_st->pkt.data = 0;

  1093.             asf_st->pkt.side_data_elems = 0;

  1094.             asf_st->pkt.side_data = NULL;

  1095.             break; // packet completed

  1096.         }

  1097.     }

  1098.     return 0;

  1099. }

  1100. 

  1101. static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)

  1102. {

  1103.     ASFContext *asf = s->priv_data;

  1104. 

  1105.     for (;;) {

  1106.         int ret;

  1107. 

  1108.         /* parse cached packets, if any */

  1109.         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)

  1110.             return ret;

  1111.         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)

  1112.             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);

  1113.         asf->packet_time_start = 0;

  1114.     }

  1115. }

  1116. 

  1117. // Added to support seeking after packets have been read

  1118. // If information is not reset, read_packet fails due to

  1119. // leftover information from previous reads

  1120. static void asf_reset_header(AVFormatContext *s)

  1121. {

  1122.     ASFContext *asf = s->priv_data;

  1123.     ASFStream *asf_st;

  1124.     int i;

  1125. 

  1126.     asf->packet_size_left = 0;

  1127.     asf->packet_segments = 0;

  1128.     asf->packet_flags = 0;

  1129.     asf->packet_property = 0;

  1130.     asf->packet_timestamp = 0;

  1131.     asf->packet_segsizetype = 0;

  1132.     asf->packet_segments = 0;

  1133.     asf->packet_seq = 0;

  1134.     asf->packet_replic_size = 0;

  1135.     asf->packet_key_frame = 0;

  1136.     asf->packet_padsize = 0;

  1137.     asf->packet_frag_offset = 0;

  1138.     asf->packet_frag_size = 0;

  1139.     asf->packet_frag_timestamp = 0;

  1140.     asf->packet_multi_size = 0;

  1141.     asf->packet_obj_size = 0;

  1142.     asf->packet_time_delta = 0;

  1143.     asf->packet_time_start = 0;

  1144. 

  1145.     for(i=0; i<s->nb_streams; i++){

  1146.         asf_st= s->streams[i]->priv_data;

  1147.         av_free_packet(&asf_st->pkt);

  1148.         asf_st->frag_offset=0;

  1149.         asf_st->seq=0;

  1150.     }

  1151.     asf->asf_st= NULL;

  1152. }

  1153. 

  1154. static int asf_read_close(AVFormatContext *s)

  1155. {

  1156.     asf_reset_header(s);

  1157. 

  1158.     return 0;

  1159. }

  1160. 

  1161. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  1162. {

  1163.     AVPacket pkt1, *pkt = &pkt1;

  1164.     ASFStream *asf_st;

  1165.     int64_t pts;

  1166.     int64_t pos= *ppos;

  1167.     int i;

  1168.     int64_t start_pos[ASF_MAX_STREAMS];

  1169. 

  1170.     for(i=0; i<s->nb_streams; i++){

  1171.         start_pos[i]= pos;

  1172.     }

  1173. 

  1174.     if (s->packet_size > 0)

  1175.         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;

  1176.     *ppos= pos;

  1177.     avio_seek(s->pb, pos, SEEK_SET);

  1178. 

  1179. //printf("asf_read_pts\n");

  1180.     asf_reset_header(s);

  1181.     for(;;){

  1182.         if (asf_read_packet(s, pkt) < 0){

  1183.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1184.             return AV_NOPTS_VALUE;

  1185.         }

  1186. 

  1187.         pts = pkt->dts;

  1188. 

  1189.         av_free_packet(pkt);

  1190.         if(pkt->flags&AV_PKT_FLAG_KEY){

  1191.             i= pkt->stream_index;

  1192. 

  1193.             asf_st= s->streams[i]->priv_data;

  1194. 

  1195. //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);

  1196.             pos= asf_st->packet_pos;

  1197. 

  1198.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1199.             start_pos[i]= asf_st->packet_pos + 1;

  1200. 

  1201.             if(pkt->stream_index == stream_index)

  1202.                break;

  1203.         }

  1204.     }

  1205. 

  1206.     *ppos= pos;

  1207. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1208. 

  1209.     return pts;

  1210. }

  1211. 

  1212. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1213. {

  1214.     ff_asf_guid g;

  1215.     ASFContext *asf = s->priv_data;

  1216.     int64_t current_pos= avio_tell(s->pb);

  1217.     int i;

  1218. 

  1219.     avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);

  1220.     ff_get_guid(s->pb, &g);

  1221. 

  1222.     /* the data object can be followed by other top-level objects,

  1223.        skip them until the simple index object is reached */

  1224.     while (ff_guidcmp(&g, &index_guid)) {

  1225.         int64_t gsize= avio_rl64(s->pb);

  1226.         if (gsize < 24 || s->pb->eof_reached) {

  1227.             avio_seek(s->pb, current_pos, SEEK_SET);

  1228.             return;

  1229.         }

  1230.         avio_skip(s->pb, gsize-24);

  1231.         ff_get_guid(s->pb, &g);

  1232.     }

  1233. 

  1234.     {

  1235.         int64_t itime, last_pos=-1;

  1236.         int pct, ict;

  1237.         int64_t av_unused gsize= avio_rl64(s->pb);

  1238.         ff_get_guid(s->pb, &g);

  1239.         itime=avio_rl64(s->pb);

  1240.         pct=avio_rl32(s->pb);

  1241.         ict=avio_rl32(s->pb);

  1242.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1243. 

  1244.         for (i=0;i<ict;i++){

  1245.             int pktnum=avio_rl32(s->pb);

  1246.             int pktct =avio_rl16(s->pb);

  1247.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1248.             int64_t index_pts= FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);

  1249. 

  1250.             if(pos != last_pos){

  1251.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d  pts: %"PRId64"\n", pktnum, pktct, index_pts);

  1252.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1253.             last_pos=pos;

  1254.             }

  1255.         }

  1256.         asf->index_read= ict > 0;

  1257.     }

  1258.     avio_seek(s->pb, current_pos, SEEK_SET);

  1259. }

  1260. 

  1261. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1262. {

  1263.     ASFContext *asf = s->priv_data;

  1264.     AVStream *st = s->streams[stream_index];

  1265.     int64_t pos;

  1266.     int index;

  1267. 

  1268.     if (s->packet_size <= 0)

  1269.         return -1;

  1270. 

  1271.     /* Try using the protocol's read_seek if available */

  1272.     if(s->pb) {

  1273.         int ret = avio_seek_time(s->pb, stream_index, pts, flags);

  1274.         if(ret >= 0)

  1275.             asf_reset_header(s);

  1276.         if (ret != AVERROR(ENOSYS))

  1277.             return ret;

  1278.     }

  1279. 

  1280.     if (!asf->index_read)

  1281.         asf_build_simple_index(s, stream_index);

  1282. 

  1283.     if((asf->index_read && st->index_entries)){

  1284.         index= av_index_search_timestamp(st, pts, flags);

  1285.         if(index >= 0) {

  1286.             /* find the position */

  1287.             pos = st->index_entries[index].pos;

  1288. 

  1289.             /* do the seek */

  1290.             av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1291.             avio_seek(s->pb, pos, SEEK_SET);

  1292.             asf_reset_header(s);

  1293.             return 0;

  1294.         }

  1295.     }

  1296.     /* no index or seeking by index failed */

  1297.     if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)

  1298.         return -1;

  1299.     asf_reset_header(s);

  1300.     return 0;

  1301. }

  1302. 

  1303. AVInputFormat ff_asf_demuxer = {

  1304.     .name           = "asf",

  1305.     .long_name      = NULL_IF_CONFIG_SMALL("ASF format"),

  1306.     .priv_data_size = sizeof(ASFContext),

  1307.     .read_probe     = asf_probe,

  1308.     .read_header    = asf_read_header,

  1309.     .read_packet    = asf_read_packet,

  1310.     .read_close     = asf_read_close,

  1311.     .read_seek      = asf_read_seek,

  1312.     .read_timestamp = asf_read_pts,

  1313.     .flags          = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,

  1314.     .priv_class     = &asf_class,

  1315. };