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FFmpeg/libavformat/asfdec.c

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  1. /*

  2.  * ASF compatible demuxer

  3.  * Copyright (c) 2000, 2001 Fabrice Bellard

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

  7.  * FFmpeg is free software; you can redistribute it and/or

  8.  * modify it under the terms of the GNU Lesser General Public

  9.  * License as published by the Free Software Foundation; either

  10.  * version 2.1 of the License, or (at your option) any later version.

  11.  *

  12.  * FFmpeg is distributed in the hope that it will be useful,

  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  15.  * Lesser General Public License for more details.

  16.  *

  17.  * You should have received a copy of the GNU Lesser General Public

  18.  * License along with FFmpeg; if not, write to the Free Software

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

  20.  */

  21. 

  22. //#define DEBUG

  23. 

  24. #include "libavutil/common.h"

  25. #include "libavutil/avstring.h"

  26. #include "libavcodec/mpegaudio.h"

  27. #include "avformat.h"

  28. #include "riff.h"

  29. #include "asf.h"

  30. #include "asfcrypt.h"

  31. #include "avlanguage.h"

  32. 

  33. void ff_mms_set_stream_selection(URLContext *h, AVFormatContext *format);

  34. 

  35. typedef struct {

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

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

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

  39.     AVRational dar[128];

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

  41.     /* non streamed additonnal info */

  42.     /* packet filling */

  43.     int packet_size_left;

  44.     /* only for reading */

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

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

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

  48.     int index_read;

  49. 

  50.     ASFMainHeader hdr;

  51. 

  52.     int packet_flags;

  53.     int packet_property;

  54.     int packet_timestamp;

  55.     int packet_segsizetype;

  56.     int packet_segments;

  57.     int packet_seq;

  58.     int packet_replic_size;

  59.     int packet_key_frame;

  60.     int packet_padsize;

  61.     unsigned int packet_frag_offset;

  62.     unsigned int packet_frag_size;

  63.     int64_t packet_frag_timestamp;

  64.     int packet_multi_size;

  65.     int packet_obj_size;

  66.     int packet_time_delta;

  67.     int packet_time_start;

  68.     int64_t packet_pos;

  69. 

  70.     int stream_index;

  71. 

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

  73. } ASFContext;

  74. 

  75. #undef NDEBUG

  76. #include <assert.h>

  77. 

  78. #define ASF_MAX_STREAMS 127

  79. #define FRAME_HEADER_SIZE 17

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

  81. 

  82. static const ff_asf_guid index_guid = {

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

  84. };

  85. 

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

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

  88. };

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

  90. /* decoding */

  91. 

  92. #ifdef DEBUG

  93. #define PRINT_IF_GUID(g,cmp) \

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

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

  96. 

  97. static void print_guid(const ff_asf_guid *g)

  98. {

  99.     int i;

  100.     PRINT_IF_GUID(g, ff_asf_header);

  101.     else PRINT_IF_GUID(g, ff_asf_file_header);

  102.     else PRINT_IF_GUID(g, ff_asf_stream_header);

  103.     else PRINT_IF_GUID(g, ff_asf_audio_stream);

  104.     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);

  105.     else PRINT_IF_GUID(g, ff_asf_video_stream);

  106.     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);

  107.     else PRINT_IF_GUID(g, ff_asf_command_stream);

  108.     else PRINT_IF_GUID(g, ff_asf_comment_header);

  109.     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);

  110.     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);

  111.     else PRINT_IF_GUID(g, ff_asf_data_header);

  112.     else PRINT_IF_GUID(g, index_guid);

  113.     else PRINT_IF_GUID(g, ff_asf_head1_guid);

  114.     else PRINT_IF_GUID(g, ff_asf_head2_guid);

  115.     else PRINT_IF_GUID(g, ff_asf_my_guid);

  116.     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);

  117.     else PRINT_IF_GUID(g, ff_asf_extended_content_header);

  118.     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);

  119.     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);

  120.     else PRINT_IF_GUID(g, ff_asf_metadata_header);

  121.     else PRINT_IF_GUID(g, ff_asf_marker_header);

  122.     else PRINT_IF_GUID(g, stream_bitrate_guid);

  123.     else PRINT_IF_GUID(g, ff_asf_language_guid);

  124.     else

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

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

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

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

  129. }

  130. #undef PRINT_IF_GUID

  131. #else

  132. #define print_guid(g)

  133. #endif

  134. 

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

  136. {

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

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

  139. }

  140. 

  141. static int asf_probe(AVProbeData *pd)

  142. {

  143.     /* check file header */

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

  145.         return AVPROBE_SCORE_MAX;

  146.     else

  147.         return 0;

  148. }

  149. 

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

  151.     switch(type){

  152.         case 2: return avio_rl32(pb);

  153.         case 3: return avio_rl32(pb);

  154.         case 4: return avio_rl64(pb);

  155.         case 5: return avio_rl16(pb);

  156.         default:return INT_MIN;

  157.     }

  158. }

  159. 

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

  161. {

  162.     char *value;

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

  164. 

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

  166.         return;

  167. 

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

  169.     if (!value)

  170.         goto finish;

  171. 

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

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

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

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

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

  177.     } else {

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

  179.         goto finish;

  180.     }

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

  182. finish:

  183.     av_freep(&value);

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

  185. }

  186. 

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

  188. {

  189.     ASFContext *asf = s->priv_data;

  190.     AVIOContext *pb = s->pb;

  191. 

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

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

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

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

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

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

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

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

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

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

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

  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.     uint64_t total_size;

  219.     unsigned int tag1;

  220.     int64_t pos1, pos2, start_time;

  221.     int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  222. 

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

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

  225.         return AVERROR(EINVAL);

  226.     }

  227. 

  228.     pos1 = avio_tell(pb);

  229. 

  230.     st = av_new_stream(s, 0);

  231.     if (!st)

  232.         return AVERROR(ENOMEM);

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

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

  235.     if (!asf_st)

  236.         return AVERROR(ENOMEM);

  237.     st->priv_data = asf_st;

  238.     start_time = asf->hdr.preroll;

  239. 

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

  241. 

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

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

  244.             (10000000 / 1000) - start_time;

  245.     }

  246.     ff_get_guid(pb, &g);

  247. 

  248.     test_for_ext_stream_audio = 0;

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

  250.         type = AVMEDIA_TYPE_AUDIO;

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

  252.         type = AVMEDIA_TYPE_VIDEO;

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

  254.         type = AVMEDIA_TYPE_VIDEO;

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

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

  257.         type = AVMEDIA_TYPE_DATA;

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

  259.         test_for_ext_stream_audio = 1;

  260.         type = AVMEDIA_TYPE_UNKNOWN;

  261.     } else {

  262.         return -1;

  263.     }

  264.     ff_get_guid(pb, &g);

  265.     total_size = avio_rl64(pb);

  266.     type_specific_size = avio_rl32(pb);

  267.     avio_rl32(pb);

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

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

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

  271. 

  272.     avio_rl32(pb);

  273. 

  274.     if (test_for_ext_stream_audio) {

  275.         ff_get_guid(pb, &g);

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

  277.             type = AVMEDIA_TYPE_AUDIO;

  278.             is_dvr_ms_audio=1;

  279.             ff_get_guid(pb, &g);

  280.             avio_rl32(pb);

  281.             avio_rl32(pb);

  282.             avio_rl32(pb);

  283.             ff_get_guid(pb, &g);

  284.             avio_rl32(pb);

  285.         }

  286.     }

  287. 

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

  289.     if (type == AVMEDIA_TYPE_AUDIO) {

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

  291.         if (is_dvr_ms_audio) {

  292.             // codec_id and codec_tag are unreliable in dvr_ms

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

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

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

  296.         }

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

  298.             st->need_parsing = AVSTREAM_PARSE_NONE;

  299.         } else {

  300.             st->need_parsing = AVSTREAM_PARSE_FULL;

  301.         }

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

  303.         pos2 = avio_tell(pb);

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

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

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

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

  308.             avio_rl16(pb); //ds_data_size

  309.             avio_r8(pb);   //ds_silence_data

  310.         }

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

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

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

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

  315.             if (!asf_st->ds_chunk_size

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

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

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

  319.         }

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

  321.             case CODEC_ID_MP3:

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

  323.                 break;

  324.             case CODEC_ID_PCM_S16LE:

  325.             case CODEC_ID_PCM_S16BE:

  326.             case CODEC_ID_PCM_U16LE:

  327.             case CODEC_ID_PCM_U16BE:

  328.             case CODEC_ID_PCM_S8:

  329.             case CODEC_ID_PCM_U8:

  330.             case CODEC_ID_PCM_ALAW:

  331.             case CODEC_ID_PCM_MULAW:

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

  333.                 break;

  334.             default:

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

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

  337.                 break;

  338.         }

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

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

  341.         avio_rl32(pb);

  342.         avio_rl32(pb);

  343.         avio_r8(pb);

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

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

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

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

  348.         /* not available for asf */

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

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

  351.         tag1 = avio_rl32(pb);

  352.         avio_seek(pb, 20, SEEK_CUR);

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

  354.         if (sizeX > 40) {

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

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

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

  358.         }

  359. 

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

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

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

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

  364.             int av_unused i;

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

  366. #if HAVE_BIGENDIAN

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

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

  369. #else

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

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

  372. #endif

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

  374.         }

  375. 

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

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

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

  379.             st->need_parsing = AVSTREAM_PARSE_FULL;

  380.             // 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

  381.             st->codec->width  =

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

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

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

  385.         }

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

  387.             st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;

  388.     }

  389.     pos2 = avio_tell(pb);

  390.     avio_seek(pb, size - (pos2 - pos1 + 24), SEEK_CUR);

  391. 

  392.     return 0;

  393. }

  394. 

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

  396. {

  397.     ASFContext *asf = s->priv_data;

  398.     AVIOContext *pb = s->pb;

  399.     ff_asf_guid g;

  400.     int ext_len, payload_ext_ct, stream_ct, i;

  401.     uint32_t ext_d, leak_rate, stream_num;

  402.     unsigned int stream_languageid_index;

  403. 

  404.     avio_rl64(pb); // starttime

  405.     avio_rl64(pb); // endtime

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

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

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

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

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

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

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

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

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

  415. 

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

  417.     if (stream_num < 128)

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

  419. 

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

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

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

  423. 

  424.     if (stream_num < 128)

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

  426. 

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

  428.         avio_rl16(pb);

  429.         ext_len = avio_rl16(pb);

  430.         avio_seek(pb, ext_len, SEEK_CUR);

  431.     }

  432. 

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

  434.         ff_get_guid(pb, &g);

  435.         ext_d=avio_rl16(pb);

  436.         ext_len=avio_rl32(pb);

  437.         avio_seek(pb, ext_len, SEEK_CUR);

  438.     }

  439. 

  440.     return 0;

  441. }

  442. 

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

  444. {

  445.     AVIOContext *pb = s->pb;

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

  447. 

  448.     len1 = avio_rl16(pb);

  449.     len2 = avio_rl16(pb);

  450.     len3 = avio_rl16(pb);

  451.     len4 = avio_rl16(pb);

  452.     len5 = avio_rl16(pb);

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

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

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

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

  457.     avio_seek(pb, len5, SEEK_CUR);

  458. 

  459.     return 0;

  460. }

  461. 

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

  463. {

  464.     AVIOContext *pb = s->pb;

  465.     ASFContext *asf = s->priv_data;

  466.     int desc_count, i, ret;

  467. 

  468.     desc_count = avio_rl16(pb);

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

  470.         int name_len,value_type,value_len;

  471.         char name[1024];

  472. 

  473.         name_len = avio_rl16(pb);

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

  475.             name_len += 1;

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

  477.             avio_seek(pb, name_len - ret, SEEK_CUR);

  478.         value_type = avio_rl16(pb);

  479.         value_len  = avio_rl16(pb);

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

  481.             value_len += 1;

  482.         /**

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

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

  485.          */

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

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

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

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

  490.         } else

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

  492.     }

  493. 

  494.     return 0;

  495. }

  496. 

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

  498. {

  499.     AVIOContext *pb = s->pb;

  500.     ASFContext *asf = s->priv_data;

  501.     int j, ret;

  502.     int stream_count = avio_rl16(pb);

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

  504.         char lang[6];

  505.         unsigned int lang_len = avio_r8(pb);

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

  507.             avio_seek(pb, lang_len - ret, SEEK_CUR);

  508.         if (j < 128)

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

  510.     }

  511. 

  512.     return 0;

  513. }

  514. 

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

  516. {

  517.     AVIOContext *pb = s->pb;

  518.     ASFContext *asf = s->priv_data;

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

  520.     int ret, i;

  521.     n = avio_rl16(pb);

  522. 

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

  524.         char name[1024];

  525. 

  526.         avio_rl16(pb); //lang_list_index

  527.         stream_num= avio_rl16(pb);

  528.         name_len=   avio_rl16(pb);

  529.         value_type= avio_rl16(pb);

  530.         value_len=  avio_rl32(pb);

  531. 

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

  533.             avio_seek(pb, name_len - ret, SEEK_CUR);

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

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

  536.         avio_seek(pb, value_len - 2, SEEK_CUR);

  537. 

  538.         if(stream_num<128){

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

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

  541.         }

  542.     }

  543. 

  544.     return 0;

  545. }

  546. 

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

  548. {

  549.     AVIOContext *pb = s->pb;

  550.     int i, count, name_len, ret;

  551.     char name[1024];

  552. 

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

  554.     avio_rl64(pb);            // ...

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

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

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

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

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

  560.     }

  561. 

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

  563.         int64_t pres_time;

  564.         int name_len;

  565. 

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

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

  568.         avio_rl16(pb);             // entry length

  569.         avio_rl32(pb);             // send time

  570.         avio_rl32(pb);             // flags

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

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

  573.             avio_seek(pb, name_len - ret, SEEK_CUR);

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

  575.     }

  576. 

  577.     return 0;

  578. }

  579. 

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

  581. {

  582.     ASFContext *asf = s->priv_data;

  583.     ff_asf_guid g;

  584.     AVIOContext *pb = s->pb;

  585.     int i;

  586.     int64_t gsize;

  587. 

  588.     ff_get_guid(pb, &g);

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

  590.         return -1;

  591.     avio_rl64(pb);

  592.     avio_rl32(pb);

  593.     avio_r8(pb);

  594.     avio_r8(pb);

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

  596.     for(;;) {

  597.         uint64_t gpos= avio_tell(pb);

  598.         ff_get_guid(pb, &g);

  599.         gsize = avio_rl64(pb);

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

  601.         print_guid(&g);

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

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

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

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

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

  607.                 asf->data_object_size = gsize - 24;

  608.             } else {

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

  610.             }

  611.             break;

  612.         }

  613.         if (gsize < 24)

  614.             return -1;

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

  616.             asf_read_file_properties(s, gsize);

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

  618.             asf_read_stream_properties(s, gsize);

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

  620.             asf_read_content_desc(s, gsize);

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

  622.             asf_read_language_list(s, gsize);

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

  624.             asf_read_ext_content_desc(s, gsize);

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

  626.             asf_read_metadata(s, gsize);

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

  628.             asf_read_ext_stream_properties(s, gsize);

  629. 

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

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

  632.             continue;

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

  634.             int v1, v2;

  635.             ff_get_guid(pb, &g);

  636.             v1 = avio_rl32(pb);

  637.             v2 = avio_rl16(pb);

  638.             continue;

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

  640.             asf_read_marker(s, gsize);

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

  642.             return -1;

  643.         } else {

  644.             if (!s->keylen) {

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

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

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

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

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

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

  651.                 }

  652.             }

  653.         }

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

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

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

  657.     }

  658.     ff_get_guid(pb, &g);

  659.     avio_rl64(pb);

  660.     avio_r8(pb);

  661.     avio_r8(pb);

  662.     if (url_feof(pb))

  663.         return -1;

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

  665.     asf->packet_size_left = 0;

  666. 

  667. 

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

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

  670.         if(stream_num>=0){

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

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

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

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

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

  676.                           &st->sample_aspect_ratio.den,

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

  678.             } 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.

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

  680.                           &st->sample_aspect_ratio.den,

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

  682. 

  683. //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);

  684. 

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

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

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

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

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

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

  691.                     if (iso6392)

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

  693.                 }

  694.             }

  695.         }

  696.     }

  697. 

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

  699. 

  700.     return 0;

  701. }

  702. 

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

  704.     switch (bits & 3) \

  705.     { \

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

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

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

  709.     default: var = defval; break; \

  710.     }

  711. 

  712. /**

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

  714.  * @param s demux context

  715.  * @param pb context to read data from

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

  717.  */

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

  719. {

  720.     ASFContext *asf = s->priv_data;

  721.     uint32_t packet_length, padsize;

  722.     int rsize = 8;

  723.     int c, d, e, off;

  724. 

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

  726.     off= 32768;

  727.     if (s->packet_size > 0)

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

  729. 

  730.     c=d=e=-1;

  731.     while(off-- > 0){

  732.         c=d; d=e;

  733.         e= avio_r8(pb);

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

  735.             break;

  736.     }

  737. 

  738.     if (c != 0x82) {

  739.         /**

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

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

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

  743.          * the stream.

  744.          */

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

  746.             return AVERROR(EAGAIN);

  747.         if (!url_feof(pb))

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

  749.     }

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

  751.         if (d || e) {

  752.             if (!url_feof(pb))

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

  754.             return -1;

  755.         }

  756.         c= avio_r8(pb);

  757.         d= avio_r8(pb);

  758.         rsize+=3;

  759.     }else{

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

  761.     }

  762. 

  763.     asf->packet_flags    = c;

  764.     asf->packet_property = d;

  765. 

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

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

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

  769. 

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

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

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

  773.         return -1;

  774.     }

  775.     if(padsize >= packet_length){

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

  777.         return -1;

  778.     }

  779. 

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

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

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

  783. 

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

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

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

  787.     } else {

  788.         asf->packet_segments = 1;

  789.         asf->packet_segsizetype = 0x80;

  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;

  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 (asf->packet_replic_size >= 8) {

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

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

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

  821.             return -1;

  822.         }

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

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

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

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

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

  828.             avio_seek(pb, 10, SEEK_CUR);

  829.             ts0= avio_rl64(pb);

  830.             ts1= avio_rl64(pb);

  831.             avio_seek(pb, 12, SEEK_CUR);

  832.             avio_rl32(pb);

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

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

  835.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  836.         }else

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

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

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

  840.         // multipacket - frag_offset is beginning timestamp

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

  842.         asf->packet_frag_offset = 0;

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

  844. 

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

  846.         rsize++;

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

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

  849.         return -1;

  850.     }

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

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

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

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

  855.             return -1;

  856.         }

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

  858.     } else {

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

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

  861.     }

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

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

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

  865.             return -1;

  866.     }

  867.     asf->packet_size_left -= rsize;

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

  869. 

  870.     return 0;

  871. }

  872. 

  873. /**

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

  875.  * with asf_get_packet()).

  876.  * @param s demux context

  877.  * @param pb context to read data from

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

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

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

  881.  */

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

  883. {

  884.     ASFContext *asf = s->priv_data;

  885.     ASFStream *asf_st = 0;

  886.     for (;;) {

  887.         int ret;

  888.         if(url_feof(pb))

  889.             return AVERROR_EOF;

  890.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  895.             assert(ret>=0);

  896.             /* fail safe */

  897.             avio_seek(pb, ret, SEEK_CUR);

  898. 

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

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

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

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

  903.             return 1;

  904.         }

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

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

  907.                 asf->packet_segments= 0;

  908.                 continue;

  909.             }

  910.             if (asf->stream_index < 0

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

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

  913.                 ) {

  914.                 asf->packet_time_start = 0;

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

  916.                 avio_seek(pb, asf->packet_frag_size, SEEK_CUR);

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

  918.                 if(asf->stream_index < 0)

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

  920.                 continue;

  921.             }

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

  923.         }

  924.         asf_st = asf->asf_st;

  925. 

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

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

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

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

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

  931.             asf->packet_size_left--;

  932.             asf->packet_multi_size--;

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

  934.             {

  935.                 asf->packet_time_start = 0;

  936.                 avio_seek(pb, asf->packet_multi_size, SEEK_CUR);

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

  938.                 continue;

  939.             }

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

  941.             //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);

  942.         }

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

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

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

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

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

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

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

  950.         }

  951. 

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

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

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

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

  956.                 asf_st->frag_offset = 0;

  957.                 av_free_packet(&asf_st->pkt);

  958.             }

  959.             /* new packet */

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

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

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

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

  964.             asf_st->pkt.pos =

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

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

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

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

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

  970.                 asf->packet_key_frame = 1;

  971.             if (asf->packet_key_frame)

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

  973.         }

  974. 

  975.         /* read data */

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

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

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

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

  980.         if (asf->packet_size_left < 0)

  981.             continue;

  982. 

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

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

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

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

  987.             continue;

  988.         }

  989. 

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

  991.                          asf->packet_frag_size);

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

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

  994.                 return ret < 0 ? ret : AVERROR_EOF;

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

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

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

  998.                 // fragment?

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

  1000.                        asf->packet_frag_size - ret);

  1001.                 ret = asf->packet_frag_size;

  1002.             } else

  1003.                 // no scrambling, so we can return partial packets

  1004.                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);

  1005.         }

  1006.         if (s->key && s->keylen == 20)

  1007.             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,

  1008.                             ret);

  1009.         asf_st->frag_offset += ret;

  1010.         /* test if whole packet is read */

  1011.         if (asf_st->frag_offset == asf_st->pkt.size) {

  1012.             //workaround for macroshit radio DVR-MS files

  1013.             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO

  1014.                && asf_st->pkt.size > 100){

  1015.                 int i;

  1016.                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);

  1017.                 if(i == asf_st->pkt.size){

  1018.                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");

  1019.                     asf_st->frag_offset = 0;

  1020.                     av_free_packet(&asf_st->pkt);

  1021.                     continue;

  1022.                 }

  1023.             }

  1024. 

  1025.             /* return packet */

  1026.             if (asf_st->ds_span > 1) {

  1027.               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){

  1028.                     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);

  1029.               }else{

  1030.                 /* packet descrambling */

  1031.                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);

  1032.                 if (newdata) {

  1033.                     int offset = 0;

  1034.                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

  1035.                     while (offset < asf_st->pkt.size) {

  1036.                         int off = offset / asf_st->ds_chunk_size;

  1037.                         int row = off / asf_st->ds_span;

  1038.                         int col = off % asf_st->ds_span;

  1039.                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;

  1040.                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);

  1041. 

  1042.                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);

  1043.                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);

  1044.                         memcpy(newdata + offset,

  1045.                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,

  1046.                                asf_st->ds_chunk_size);

  1047.                         offset += asf_st->ds_chunk_size;

  1048.                     }

  1049.                     av_free(asf_st->pkt.data);

  1050.                     asf_st->pkt.data = newdata;

  1051.                 }

  1052.               }

  1053.             }

  1054.             asf_st->frag_offset = 0;

  1055.             *pkt= asf_st->pkt;

  1056.             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);

  1057.             asf_st->pkt.size = 0;

  1058.             asf_st->pkt.data = 0;

  1059.             break; // packet completed

  1060.         }

  1061.     }

  1062.     return 0;

  1063. }

  1064. 

  1065. static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)

  1066. {

  1067.     ASFContext *asf = s->priv_data;

  1068. 

  1069.     for (;;) {

  1070.         int ret;

  1071. 

  1072.         /* parse cached packets, if any */

  1073.         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)

  1074.             return ret;

  1075.         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)

  1076.             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);

  1077.         asf->packet_time_start = 0;

  1078.     }

  1079. 

  1080.     return 0;

  1081. }

  1082. 

  1083. // Added to support seeking after packets have been read

  1084. // If information is not reset, read_packet fails due to

  1085. // leftover information from previous reads

  1086. static void asf_reset_header(AVFormatContext *s)

  1087. {

  1088.     ASFContext *asf = s->priv_data;

  1089.     ASFStream *asf_st;

  1090.     int i;

  1091. 

  1092.     asf->packet_size_left = 0;

  1093.     asf->packet_segments = 0;

  1094.     asf->packet_flags = 0;

  1095.     asf->packet_property = 0;

  1096.     asf->packet_timestamp = 0;

  1097.     asf->packet_segsizetype = 0;

  1098.     asf->packet_segments = 0;

  1099.     asf->packet_seq = 0;

  1100.     asf->packet_replic_size = 0;

  1101.     asf->packet_key_frame = 0;

  1102.     asf->packet_padsize = 0;

  1103.     asf->packet_frag_offset = 0;

  1104.     asf->packet_frag_size = 0;

  1105.     asf->packet_frag_timestamp = 0;

  1106.     asf->packet_multi_size = 0;

  1107.     asf->packet_obj_size = 0;

  1108.     asf->packet_time_delta = 0;

  1109.     asf->packet_time_start = 0;

  1110. 

  1111.     for(i=0; i<s->nb_streams; i++){

  1112.         asf_st= s->streams[i]->priv_data;

  1113.         av_free_packet(&asf_st->pkt);

  1114.         asf_st->frag_offset=0;

  1115.         asf_st->seq=0;

  1116.     }

  1117.     asf->asf_st= NULL;

  1118. }

  1119. 

  1120. static int asf_read_close(AVFormatContext *s)

  1121. {

  1122.     int i;

  1123. 

  1124.     asf_reset_header(s);

  1125.     for(i=0;i<s->nb_streams;i++) {

  1126.         AVStream *st = s->streams[i];

  1127.         av_free(st->codec->palctrl);

  1128.     }

  1129.     return 0;

  1130. }

  1131. 

  1132. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  1133. {

  1134.     AVPacket pkt1, *pkt = &pkt1;

  1135.     ASFStream *asf_st;

  1136.     int64_t pts;

  1137.     int64_t pos= *ppos;

  1138.     int i;

  1139.     int64_t start_pos[ASF_MAX_STREAMS];

  1140. 

  1141.     for(i=0; i<s->nb_streams; i++){

  1142.         start_pos[i]= pos;

  1143.     }

  1144. 

  1145.     if (s->packet_size > 0)

  1146.         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;

  1147.     *ppos= pos;

  1148.     avio_seek(s->pb, pos, SEEK_SET);

  1149. 

  1150. //printf("asf_read_pts\n");

  1151.     asf_reset_header(s);

  1152.     for(;;){

  1153.         if (av_read_frame(s, pkt) < 0){

  1154.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1155.             return AV_NOPTS_VALUE;

  1156.         }

  1157. 

  1158.         pts= pkt->pts;

  1159. 

  1160.         av_free_packet(pkt);

  1161.         if(pkt->flags&AV_PKT_FLAG_KEY){

  1162.             i= pkt->stream_index;

  1163. 

  1164.             asf_st= s->streams[i]->priv_data;

  1165. 

  1166. //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);

  1167.             pos= asf_st->packet_pos;

  1168. 

  1169.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1170.             start_pos[i]= asf_st->packet_pos + 1;

  1171. 

  1172.             if(pkt->stream_index == stream_index)

  1173.                break;

  1174.         }

  1175.     }

  1176. 

  1177.     *ppos= pos;

  1178. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1179. 

  1180.     return pts;

  1181. }

  1182. 

  1183. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1184. {

  1185.     ff_asf_guid g;

  1186.     ASFContext *asf = s->priv_data;

  1187.     int64_t current_pos= avio_tell(s->pb);

  1188.     int i;

  1189. 

  1190.     avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);

  1191.     ff_get_guid(s->pb, &g);

  1192. 

  1193.     /* the data object can be followed by other top-level objects,

  1194.        skip them until the simple index object is reached */

  1195.     while (ff_guidcmp(&g, &index_guid)) {

  1196.         int64_t gsize= avio_rl64(s->pb);

  1197.         if (gsize < 24 || url_feof(s->pb)) {

  1198.             avio_seek(s->pb, current_pos, SEEK_SET);

  1199.             return;

  1200.         }

  1201.         avio_seek(s->pb, gsize-24, SEEK_CUR);

  1202.         ff_get_guid(s->pb, &g);

  1203.     }

  1204. 

  1205.     {

  1206.         int64_t itime, last_pos=-1;

  1207.         int pct, ict;

  1208.         int64_t av_unused gsize= avio_rl64(s->pb);

  1209.         ff_get_guid(s->pb, &g);

  1210.         itime=avio_rl64(s->pb);

  1211.         pct=avio_rl32(s->pb);

  1212.         ict=avio_rl32(s->pb);

  1213.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1214. 

  1215.         for (i=0;i<ict;i++){

  1216.             int pktnum=avio_rl32(s->pb);

  1217.             int pktct =avio_rl16(s->pb);

  1218.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1219.             int64_t index_pts= av_rescale(itime, i, 10000);

  1220. 

  1221.             if(pos != last_pos){

  1222.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);

  1223.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1224.             last_pos=pos;

  1225.             }

  1226.         }

  1227.         asf->index_read= 1;

  1228.     }

  1229.     avio_seek(s->pb, current_pos, SEEK_SET);

  1230. }

  1231. 

  1232. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1233. {

  1234.     ASFContext *asf = s->priv_data;

  1235.     AVStream *st = s->streams[stream_index];

  1236.     int64_t pos;

  1237.     int index;

  1238. 

  1239.     if (s->packet_size <= 0)

  1240.         return -1;

  1241. 

  1242.     /* Try using the protocol's read_seek if available */

  1243.     if(s->pb) {

  1244.         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);

  1245.         if(ret >= 0)

  1246.             asf_reset_header(s);

  1247.         if (ret != AVERROR(ENOSYS))

  1248.             return ret;

  1249.     }

  1250. 

  1251.     if (!asf->index_read)

  1252.         asf_build_simple_index(s, stream_index);

  1253. 

  1254.     if(!(asf->index_read && st->index_entries)){

  1255.         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)

  1256.             return -1;

  1257.     }else{

  1258.         index= av_index_search_timestamp(st, pts, flags);

  1259.         if(index<0)

  1260.             return -1;

  1261. 

  1262.         /* find the position */

  1263.         pos = st->index_entries[index].pos;

  1264. 

  1265.     // various attempts to find key frame have failed so far

  1266.     //    asf_reset_header(s);

  1267.     //    avio_seek(s->pb, pos, SEEK_SET);

  1268.     //    key_pos = pos;

  1269.     //     for(i=0;i<16;i++){

  1270.     //         pos = avio_tell(s->pb);

  1271.     //         if (av_read_frame(s, &pkt) < 0){

  1272.     //             av_log(s, AV_LOG_INFO, "seek failed\n");

  1273.     //             return -1;

  1274.     //         }

  1275.     //         asf_st = s->streams[stream_index]->priv_data;

  1276.     //         pos += st->parser->frame_offset;

  1277.     //

  1278.     //         if (pkt.size > b) {

  1279.     //             b = pkt.size;

  1280.     //             key_pos = pos;

  1281.     //         }

  1282.     //

  1283.     //         av_free_packet(&pkt);

  1284.     //     }

  1285. 

  1286.         /* do the seek */

  1287.         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1288.         avio_seek(s->pb, pos, SEEK_SET);

  1289.     }

  1290.     asf_reset_header(s);

  1291.     return 0;

  1292. }

  1293. 

  1294. AVInputFormat ff_asf_demuxer = {

  1295.     "asf",

  1296.     NULL_IF_CONFIG_SMALL("ASF format"),

  1297.     sizeof(ASFContext),

  1298.     asf_probe,

  1299.     asf_read_header,

  1300.     asf_read_packet,

  1301.     asf_read_close,

  1302.     asf_read_seek,

  1303.     asf_read_pts,

  1304. };