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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 "avio_internal.h"

  29. #include "riff.h"

  30. #include "asf.h"

  31. #include "asfcrypt.h"

  32. #include "avlanguage.h"

  33. 

  34. typedef struct {

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

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

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

  38.     AVRational dar[128];

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

  40.     /* non streamed additonnal info */

  41.     /* packet filling */

  42.     int packet_size_left;

  43.     /* only for reading */

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

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

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

  47.     int index_read;

  48. 

  49.     ASFMainHeader hdr;

  50. 

  51.     int packet_flags;

  52.     int packet_property;

  53.     int packet_timestamp;

  54.     int packet_segsizetype;

  55.     int packet_segments;

  56.     int packet_seq;

  57.     int packet_replic_size;

  58.     int packet_key_frame;

  59.     int packet_padsize;

  60.     unsigned int packet_frag_offset;

  61.     unsigned int packet_frag_size;

  62.     int64_t packet_frag_timestamp;

  63.     int packet_multi_size;

  64.     int packet_obj_size;

  65.     int packet_time_delta;

  66.     int packet_time_start;

  67.     int64_t packet_pos;

  68. 

  69.     int stream_index;

  70. 

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

  72. } ASFContext;

  73. 

  74. #undef NDEBUG

  75. #include <assert.h>

  76. 

  77. #define ASF_MAX_STREAMS 127

  78. #define FRAME_HEADER_SIZE 17

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

  80. 

  81. static const ff_asf_guid index_guid = {

  82.     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb

  83. };

  84. 

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

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

  87. };

  88. /**********************************/

  89. /* decoding */

  90. 

  91. #ifdef DEBUG

  92. #define PRINT_IF_GUID(g,cmp) \

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

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

  95. 

  96. static void print_guid(const ff_asf_guid *g)

  97. {

  98.     int i;

  99.     PRINT_IF_GUID(g, ff_asf_header);

  100.     else PRINT_IF_GUID(g, ff_asf_file_header);

  101.     else PRINT_IF_GUID(g, ff_asf_stream_header);

  102.     else PRINT_IF_GUID(g, ff_asf_audio_stream);

  103.     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);

  104.     else PRINT_IF_GUID(g, ff_asf_video_stream);

  105.     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);

  106.     else PRINT_IF_GUID(g, ff_asf_command_stream);

  107.     else PRINT_IF_GUID(g, ff_asf_comment_header);

  108.     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);

  109.     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);

  110.     else PRINT_IF_GUID(g, ff_asf_data_header);

  111.     else PRINT_IF_GUID(g, index_guid);

  112.     else PRINT_IF_GUID(g, ff_asf_head1_guid);

  113.     else PRINT_IF_GUID(g, ff_asf_head2_guid);

  114.     else PRINT_IF_GUID(g, ff_asf_my_guid);

  115.     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);

  116.     else PRINT_IF_GUID(g, ff_asf_extended_content_header);

  117.     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);

  118.     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);

  119.     else PRINT_IF_GUID(g, ff_asf_metadata_header);

  120.     else PRINT_IF_GUID(g, ff_asf_marker_header);

  121.     else PRINT_IF_GUID(g, stream_bitrate_guid);

  122.     else PRINT_IF_GUID(g, ff_asf_language_guid);

  123.     else

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

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

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

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

  128. }

  129. #undef PRINT_IF_GUID

  130. #else

  131. #define print_guid(g)

  132. #endif

  133. 

  134. static int asf_probe(AVProbeData *pd)

  135. {

  136.     /* check file header */

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

  138.         return AVPROBE_SCORE_MAX;

  139.     else

  140.         return 0;

  141. }

  142. 

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

  144.     switch(type){

  145.         case 2: return avio_rl32(pb);

  146.         case 3: return avio_rl32(pb);

  147.         case 4: return avio_rl64(pb);

  148.         case 5: return avio_rl16(pb);

  149.         default:return INT_MIN;

  150.     }

  151. }

  152. 

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

  154. {

  155.     char *value;

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

  157. 

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

  159.         return;

  160. 

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

  162.     if (!value)

  163.         goto finish;

  164. 

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

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

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

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

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

  170.     } else {

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

  172.         goto finish;

  173.     }

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

  175. finish:

  176.     av_freep(&value);

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

  178. }

  179. 

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

  181. {

  182.     ASFContext *asf = s->priv_data;

  183.     AVIOContext *pb = s->pb;

  184. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  198. 

  199.     return 0;

  200. }

  201. 

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

  203. {

  204.     ASFContext *asf = s->priv_data;

  205.     AVIOContext *pb = s->pb;

  206.     AVStream *st;

  207.     ASFStream *asf_st;

  208.     ff_asf_guid g;

  209.     enum AVMediaType type;

  210.     int type_specific_size, sizeX;

  211.     uint64_t total_size;

  212.     unsigned int tag1;

  213.     int64_t pos1, pos2, start_time;

  214.     int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  215. 

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

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

  218.         return AVERROR(EINVAL);

  219.     }

  220. 

  221.     pos1 = avio_tell(pb);

  222. 

  223.     st = av_new_stream(s, 0);

  224.     if (!st)

  225.         return AVERROR(ENOMEM);

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

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

  228.     if (!asf_st)

  229.         return AVERROR(ENOMEM);

  230.     st->priv_data = asf_st;

  231.     start_time = asf->hdr.preroll;

  232. 

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

  234. 

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

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

  237.             (10000000 / 1000) - start_time;

  238.     }

  239.     ff_get_guid(pb, &g);

  240. 

  241.     test_for_ext_stream_audio = 0;

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

  243.         type = AVMEDIA_TYPE_AUDIO;

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

  245.         type = AVMEDIA_TYPE_VIDEO;

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

  247.         type = AVMEDIA_TYPE_VIDEO;

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

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

  250.         type = AVMEDIA_TYPE_DATA;

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

  252.         test_for_ext_stream_audio = 1;

  253.         type = AVMEDIA_TYPE_UNKNOWN;

  254.     } else {

  255.         return -1;

  256.     }

  257.     ff_get_guid(pb, &g);

  258.     total_size = avio_rl64(pb);

  259.     type_specific_size = avio_rl32(pb);

  260.     avio_rl32(pb);

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

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

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

  264. 

  265.     avio_rl32(pb);

  266. 

  267.     if (test_for_ext_stream_audio) {

  268.         ff_get_guid(pb, &g);

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

  270.             type = AVMEDIA_TYPE_AUDIO;

  271.             is_dvr_ms_audio=1;

  272.             ff_get_guid(pb, &g);

  273.             avio_rl32(pb);

  274.             avio_rl32(pb);

  275.             avio_rl32(pb);

  276.             ff_get_guid(pb, &g);

  277.             avio_rl32(pb);

  278.         }

  279.     }

  280. 

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

  282.     if (type == AVMEDIA_TYPE_AUDIO) {

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

  284.         if (is_dvr_ms_audio) {

  285.             // codec_id and codec_tag are unreliable in dvr_ms

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

  287.             st->request_probe= 1;

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

  289.         }

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

  291.             st->need_parsing = AVSTREAM_PARSE_NONE;

  292.         } else {

  293.             st->need_parsing = AVSTREAM_PARSE_FULL;

  294.         }

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

  296.         pos2 = avio_tell(pb);

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

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

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

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

  301.             avio_rl16(pb); //ds_data_size

  302.             avio_r8(pb);   //ds_silence_data

  303.         }

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

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

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

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

  308.             if (!asf_st->ds_chunk_size

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

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

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

  312.         }

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

  314.             case CODEC_ID_MP3:

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

  316.                 break;

  317.             case CODEC_ID_PCM_S16LE:

  318.             case CODEC_ID_PCM_S16BE:

  319.             case CODEC_ID_PCM_U16LE:

  320.             case CODEC_ID_PCM_U16BE:

  321.             case CODEC_ID_PCM_S8:

  322.             case CODEC_ID_PCM_U8:

  323.             case CODEC_ID_PCM_ALAW:

  324.             case CODEC_ID_PCM_MULAW:

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

  326.                 break;

  327.             default:

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

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

  330.                 break;

  331.         }

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

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

  334.         avio_rl32(pb);

  335.         avio_rl32(pb);

  336.         avio_r8(pb);

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

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

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

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

  341.         /* not available for asf */

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

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

  344.         tag1 = avio_rl32(pb);

  345.         avio_skip(pb, 20);

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

  347.         if (sizeX > 40) {

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

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

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

  351.         }

  352. 

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

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

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

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

  357.             int av_unused i;

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

  359. #if HAVE_BIGENDIAN

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

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

  362. #else

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

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

  365. #endif

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

  367.         }

  368. 

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

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

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

  372.             st->need_parsing = AVSTREAM_PARSE_FULL;

  373.             // issue658 containse wrong w/h and MS even puts a fake seq header with wrong w/h in extradata while a correct one is in te stream. maximum lameness

  374.             st->codec->width  =

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

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

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

  378.         }

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

  380.             st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;

  381.     }

  382.     pos2 = avio_tell(pb);

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

  384. 

  385.     return 0;

  386. }

  387. 

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

  389. {

  390.     ASFContext *asf = s->priv_data;

  391.     AVIOContext *pb = s->pb;

  392.     ff_asf_guid g;

  393.     int ext_len, payload_ext_ct, stream_ct, i;

  394.     uint32_t ext_d, leak_rate, stream_num;

  395.     unsigned int stream_languageid_index;

  396. 

  397.     avio_rl64(pb); // starttime

  398.     avio_rl64(pb); // endtime

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

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

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

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

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

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

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

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

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

  408. 

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

  410.     if (stream_num < 128)

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

  412. 

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

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

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

  416. 

  417.     if (stream_num < 128)

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

  419. 

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

  421.         avio_rl16(pb);

  422.         ext_len = avio_rl16(pb);

  423.         avio_skip(pb, ext_len);

  424.     }

  425. 

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

  427.         ff_get_guid(pb, &g);

  428.         ext_d=avio_rl16(pb);

  429.         ext_len=avio_rl32(pb);

  430.         avio_skip(pb, ext_len);

  431.     }

  432. 

  433.     return 0;

  434. }

  435. 

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

  437. {

  438.     AVIOContext *pb = s->pb;

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

  440. 

  441.     len1 = avio_rl16(pb);

  442.     len2 = avio_rl16(pb);

  443.     len3 = avio_rl16(pb);

  444.     len4 = avio_rl16(pb);

  445.     len5 = avio_rl16(pb);

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

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

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

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

  450.     avio_skip(pb, len5);

  451. 

  452.     return 0;

  453. }

  454. 

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

  456. {

  457.     AVIOContext *pb = s->pb;

  458.     ASFContext *asf = s->priv_data;

  459.     int desc_count, i, ret;

  460. 

  461.     desc_count = avio_rl16(pb);

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

  463.         int name_len,value_type,value_len;

  464.         char name[1024];

  465. 

  466.         name_len = avio_rl16(pb);

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

  468.             name_len += 1;

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

  470.             avio_skip(pb, name_len - ret);

  471.         value_type = avio_rl16(pb);

  472.         value_len  = avio_rl16(pb);

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

  474.             value_len += 1;

  475.         /**

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

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

  478.          */

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

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

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

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

  483.         } else

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

  485.     }

  486. 

  487.     return 0;

  488. }

  489. 

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

  491. {

  492.     AVIOContext *pb = s->pb;

  493.     ASFContext *asf = s->priv_data;

  494.     int j, ret;

  495.     int stream_count = avio_rl16(pb);

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

  497.         char lang[6];

  498.         unsigned int lang_len = avio_r8(pb);

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

  500.             avio_skip(pb, lang_len - ret);

  501.         if (j < 128)

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

  503.     }

  504. 

  505.     return 0;

  506. }

  507. 

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

  509. {

  510.     AVIOContext *pb = s->pb;

  511.     ASFContext *asf = s->priv_data;

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

  513.     int ret, i;

  514.     n = avio_rl16(pb);

  515. 

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

  517.         char name[1024];

  518. 

  519.         avio_rl16(pb); //lang_list_index

  520.         stream_num= avio_rl16(pb);

  521.         name_len=   avio_rl16(pb);

  522.         value_type= avio_rl16(pb);

  523.         value_len=  avio_rl32(pb);

  524. 

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

  526.             avio_skip(pb, name_len - ret);

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

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

  529.         avio_skip(pb, value_len - 2);

  530. 

  531.         if(stream_num<128){

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

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

  534.         }

  535.     }

  536. 

  537.     return 0;

  538. }

  539. 

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

  541. {

  542.     AVIOContext *pb = s->pb;

  543.     int i, count, name_len, ret;

  544.     char name[1024];

  545. 

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

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

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

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

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

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

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

  553.     }

  554. 

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

  556.         int64_t pres_time;

  557.         int name_len;

  558. 

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

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

  561.         avio_rl16(pb);             // entry length

  562.         avio_rl32(pb);             // send time

  563.         avio_rl32(pb);             // flags

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

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

  566.             avio_skip(pb, name_len - ret);

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

  568.     }

  569. 

  570.     return 0;

  571. }

  572. 

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

  574. {

  575.     ASFContext *asf = s->priv_data;

  576.     ff_asf_guid g;

  577.     AVIOContext *pb = s->pb;

  578.     int i;

  579.     int64_t gsize;

  580. 

  581.     ff_get_guid(pb, &g);

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

  583.         return -1;

  584.     avio_rl64(pb);

  585.     avio_rl32(pb);

  586.     avio_r8(pb);

  587.     avio_r8(pb);

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

  589.     for(;;) {

  590.         uint64_t gpos= avio_tell(pb);

  591.         ff_get_guid(pb, &g);

  592.         gsize = avio_rl64(pb);

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

  594.         print_guid(&g);

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

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

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

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

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

  600.                 asf->data_object_size = gsize - 24;

  601.             } else {

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

  603.             }

  604.             break;

  605.         }

  606.         if (gsize < 24)

  607.             return -1;

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

  609.             asf_read_file_properties(s, gsize);

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

  611.             asf_read_stream_properties(s, gsize);

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

  613.             asf_read_content_desc(s, gsize);

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

  615.             asf_read_language_list(s, gsize);

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

  617.             asf_read_ext_content_desc(s, gsize);

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

  619.             asf_read_metadata(s, gsize);

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

  621.             asf_read_ext_stream_properties(s, gsize);

  622. 

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

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

  625.             continue;

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

  627.             int v1, v2;

  628.             ff_get_guid(pb, &g);

  629.             v1 = avio_rl32(pb);

  630.             v2 = avio_rl16(pb);

  631.             continue;

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

  633.             asf_read_marker(s, gsize);

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

  635.             return -1;

  636.         } else {

  637.             if (!s->keylen) {

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

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

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

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

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

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

  644.                 }

  645.             }

  646.         }

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

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

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

  650.     }

  651.     ff_get_guid(pb, &g);

  652.     avio_rl64(pb);

  653.     avio_r8(pb);

  654.     avio_r8(pb);

  655.     if (url_feof(pb))

  656.         return -1;

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

  658.     asf->packet_size_left = 0;

  659. 

  660. 

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

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

  663.         if(stream_num>=0){

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

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

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

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

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

  669.                           &st->sample_aspect_ratio.den,

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

  671.             } else if ((asf->dar[0].num > 0) && (asf->dar[0].den > 0) && (st->codec->codec_type==AVMEDIA_TYPE_VIDEO)) // Use ASF container value if the stream doesn't AR set.

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

  673.                           &st->sample_aspect_ratio.den,

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

  675. 

  676. //av_log(s, AV_LOG_INFO, "i=%d, st->codec->codec_type:%d, dar %d:%d sar=%d:%d\n", i, st->codec->codec_type, dar[i].num, dar[i].den, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);

  677. 

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

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

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

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

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

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

  684.                     if (iso6392)

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

  686.                 }

  687.             }

  688.         }

  689.     }

  690. 

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

  692. 

  693.     return 0;

  694. }

  695. 

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

  697.     switch (bits & 3) \

  698.     { \

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

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

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

  702.     default: var = defval; break; \

  703.     }

  704. 

  705. /**

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

  707.  * @param s demux context

  708.  * @param pb context to read data from

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

  710.  */

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

  712. {

  713.     ASFContext *asf = s->priv_data;

  714.     uint32_t packet_length, padsize;

  715.     int rsize = 8;

  716.     int c, d, e, off;

  717. 

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

  719.     off= 32768;

  720.     if (s->packet_size > 0)

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

  722. 

  723.     c=d=e=-1;

  724.     while(off-- > 0){

  725.         c=d; d=e;

  726.         e= avio_r8(pb);

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

  728.             break;

  729.     }

  730. 

  731.     if (c != 0x82) {

  732.         /**

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

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

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

  736.          * the stream.

  737.          */

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

  739.             return AVERROR(EAGAIN);

  740.         if (!url_feof(pb))

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

  742.     }

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

  744.         if (d || e) {

  745.             if (!url_feof(pb))

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

  747.             return -1;

  748.         }

  749.         c= avio_r8(pb);

  750.         d= avio_r8(pb);

  751.         rsize+=3;

  752.     }else{

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

  754.     }

  755. 

  756.     asf->packet_flags    = c;

  757.     asf->packet_property = d;

  758. 

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

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

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

  762. 

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

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

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

  766.         return -1;

  767.     }

  768.     if(padsize >= packet_length){

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

  770.         return -1;

  771.     }

  772. 

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

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

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

  776. 

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

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

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

  780.     } else {

  781.         asf->packet_segments = 1;

  782.         asf->packet_segsizetype = 0x80;

  783.     }

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

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

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

  787.     asf->packet_padsize = padsize;

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

  789.     return 0;

  790. }

  791. 

  792. /**

  793.  *

  794.  * @return <0 if error

  795.  */

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

  797.     ASFContext *asf = s->priv_data;

  798.     int rsize = 1;

  799.     int num = avio_r8(pb);

  800.     int64_t ts0, ts1;

  801. 

  802.     asf->packet_segments--;

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

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

  805.     // sequence should be ignored!

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

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

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

  809. //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);

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

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

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

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

  814.             return -1;

  815.         }

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

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

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

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

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

  821.             avio_skip(pb, 10);

  822.             ts0= avio_rl64(pb);

  823.             ts1= avio_rl64(pb);

  824.             avio_skip(pb, 12);

  825.             avio_rl32(pb);

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

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

  828.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  829.         }else

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

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

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

  833.         // multipacket - frag_offset is beginning timestamp

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

  835.         asf->packet_frag_offset = 0;

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

  837. 

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

  839.         rsize++;

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

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

  842.         return -1;

  843.     }

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

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

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

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

  848.             return -1;

  849.         }

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

  851.     } else {

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

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

  854.     }

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

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

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

  858.             return -1;

  859.     }

  860.     asf->packet_size_left -= rsize;

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

  862. 

  863.     return 0;

  864. }

  865. 

  866. /**

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

  868.  * with asf_get_packet()).

  869.  * @param s demux context

  870.  * @param pb context to read data from

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

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

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

  874.  */

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

  876. {

  877.     ASFContext *asf = s->priv_data;

  878.     ASFStream *asf_st = 0;

  879.     for (;;) {

  880.         int ret;

  881.         if(url_feof(pb))

  882.             return AVERROR_EOF;

  883.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  888.             assert(ret>=0);

  889.             /* fail safe */

  890.             avio_skip(pb, ret);

  891. 

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

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

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

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

  896.             return 1;

  897.         }

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

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

  900.                 asf->packet_segments= 0;

  901.                 continue;

  902.             }

  903.             if (asf->stream_index < 0

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

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

  906.                 ) {

  907.                 asf->packet_time_start = 0;

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

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

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

  911.                 if(asf->stream_index < 0)

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

  913.                 continue;

  914.             }

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

  916.         }

  917.         asf_st = asf->asf_st;

  918. 

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

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

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

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

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

  924.             asf->packet_size_left--;

  925.             asf->packet_multi_size--;

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

  927.             {

  928.                 asf->packet_time_start = 0;

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

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

  931.                 continue;

  932.             }

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

  934.             //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);

  935.         }

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

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

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

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

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

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

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

  943.         }

  944. 

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

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

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

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

  949.                 asf_st->frag_offset = 0;

  950.                 av_free_packet(&asf_st->pkt);

  951.             }

  952.             /* new packet */

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

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

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

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

  957.             asf_st->pkt.pos =

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

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

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

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

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

  963.                 asf->packet_key_frame = 1;

  964.             if (asf->packet_key_frame)

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

  966.         }

  967. 

  968.         /* read data */

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

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

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

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

  973.         if (asf->packet_size_left < 0)

  974.             continue;

  975. 

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

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

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

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

  980.             continue;

  981.         }

  982. 

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

  984.                          asf->packet_frag_size);

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

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

  987.                 return ret < 0 ? ret : AVERROR_EOF;

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

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

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

  991.                 // fragment?

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

  993.                        asf->packet_frag_size - ret);

  994.                 ret = asf->packet_frag_size;

  995.             } else

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

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

  998.         }

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

  1000.             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,

  1001.                             ret);

  1002.         asf_st->frag_offset += ret;

  1003.         /* test if whole packet is read */

  1004.         if (asf_st->frag_offset == asf_st->pkt.size) {

  1005.             //workaround for macroshit radio DVR-MS files

  1006.             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO

  1007.                && asf_st->pkt.size > 100){

  1008.                 int i;

  1009.                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);

  1010.                 if(i == asf_st->pkt.size){

  1011.                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");

  1012.                     asf_st->frag_offset = 0;

  1013.                     av_free_packet(&asf_st->pkt);

  1014.                     continue;

  1015.                 }

  1016.             }

  1017. 

  1018.             /* return packet */

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

  1020.               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){

  1021.                     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);

  1022.               }else{

  1023.                 /* packet descrambling */

  1024.                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);

  1025.                 if (newdata) {

  1026.                     int offset = 0;

  1027.                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

  1028.                     while (offset < asf_st->pkt.size) {

  1029.                         int off = offset / asf_st->ds_chunk_size;

  1030.                         int row = off / asf_st->ds_span;

  1031.                         int col = off % asf_st->ds_span;

  1032.                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;

  1033.                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);

  1034. 

  1035.                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);

  1036.                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);

  1037.                         memcpy(newdata + offset,

  1038.                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,

  1039.                                asf_st->ds_chunk_size);

  1040.                         offset += asf_st->ds_chunk_size;

  1041.                     }

  1042.                     av_free(asf_st->pkt.data);

  1043.                     asf_st->pkt.data = newdata;

  1044.                 }

  1045.               }

  1046.             }

  1047.             asf_st->frag_offset = 0;

  1048.             *pkt= asf_st->pkt;

  1049.             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);

  1050.             asf_st->pkt.size = 0;

  1051.             asf_st->pkt.data = 0;

  1052.             break; // packet completed

  1053.         }

  1054.     }

  1055.     return 0;

  1056. }

  1057. 

  1058. static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)

  1059. {

  1060.     ASFContext *asf = s->priv_data;

  1061. 

  1062.     for (;;) {

  1063.         int ret;

  1064. 

  1065.         /* parse cached packets, if any */

  1066.         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)

  1067.             return ret;

  1068.         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)

  1069.             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);

  1070.         asf->packet_time_start = 0;

  1071.     }

  1072. 

  1073.     return 0;

  1074. }

  1075. 

  1076. // Added to support seeking after packets have been read

  1077. // If information is not reset, read_packet fails due to

  1078. // leftover information from previous reads

  1079. static void asf_reset_header(AVFormatContext *s)

  1080. {

  1081.     ASFContext *asf = s->priv_data;

  1082.     ASFStream *asf_st;

  1083.     int i;

  1084. 

  1085.     asf->packet_size_left = 0;

  1086.     asf->packet_segments = 0;

  1087.     asf->packet_flags = 0;

  1088.     asf->packet_property = 0;

  1089.     asf->packet_timestamp = 0;

  1090.     asf->packet_segsizetype = 0;

  1091.     asf->packet_segments = 0;

  1092.     asf->packet_seq = 0;

  1093.     asf->packet_replic_size = 0;

  1094.     asf->packet_key_frame = 0;

  1095.     asf->packet_padsize = 0;

  1096.     asf->packet_frag_offset = 0;

  1097.     asf->packet_frag_size = 0;

  1098.     asf->packet_frag_timestamp = 0;

  1099.     asf->packet_multi_size = 0;

  1100.     asf->packet_obj_size = 0;

  1101.     asf->packet_time_delta = 0;

  1102.     asf->packet_time_start = 0;

  1103. 

  1104.     for(i=0; i<s->nb_streams; i++){

  1105.         asf_st= s->streams[i]->priv_data;

  1106.         av_free_packet(&asf_st->pkt);

  1107.         asf_st->frag_offset=0;

  1108.         asf_st->seq=0;

  1109.     }

  1110.     asf->asf_st= NULL;

  1111. }

  1112. 

  1113. static int asf_read_close(AVFormatContext *s)

  1114. {

  1115.     int i;

  1116. 

  1117.     asf_reset_header(s);

  1118.     for(i=0;i<s->nb_streams;i++) {

  1119.         AVStream *st = s->streams[i];

  1120.         av_free(st->codec->palctrl);

  1121.     }

  1122.     return 0;

  1123. }

  1124. 

  1125. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  1126. {

  1127.     AVPacket pkt1, *pkt = &pkt1;

  1128.     ASFStream *asf_st;

  1129.     int64_t pts;

  1130.     int64_t pos= *ppos;

  1131.     int i;

  1132.     int64_t start_pos[ASF_MAX_STREAMS];

  1133. 

  1134.     for(i=0; i<s->nb_streams; i++){

  1135.         start_pos[i]= pos;

  1136.     }

  1137. 

  1138.     if (s->packet_size > 0)

  1139.         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;

  1140.     *ppos= pos;

  1141.     avio_seek(s->pb, pos, SEEK_SET);

  1142. 

  1143. //printf("asf_read_pts\n");

  1144.     asf_reset_header(s);

  1145.     for(;;){

  1146.         if (av_read_frame(s, pkt) < 0){

  1147.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1148.             return AV_NOPTS_VALUE;

  1149.         }

  1150. 

  1151.         pts= pkt->pts;

  1152. 

  1153.         av_free_packet(pkt);

  1154.         if(pkt->flags&AV_PKT_FLAG_KEY){

  1155.             i= pkt->stream_index;

  1156. 

  1157.             asf_st= s->streams[i]->priv_data;

  1158. 

  1159. //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);

  1160.             pos= asf_st->packet_pos;

  1161. 

  1162.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1163.             start_pos[i]= asf_st->packet_pos + 1;

  1164. 

  1165.             if(pkt->stream_index == stream_index)

  1166.                break;

  1167.         }

  1168.     }

  1169. 

  1170.     *ppos= pos;

  1171. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1172. 

  1173.     return pts;

  1174. }

  1175. 

  1176. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1177. {

  1178.     ff_asf_guid g;

  1179.     ASFContext *asf = s->priv_data;

  1180.     int64_t current_pos= avio_tell(s->pb);

  1181.     int i;

  1182. 

  1183.     avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);

  1184.     ff_get_guid(s->pb, &g);

  1185. 

  1186.     /* the data object can be followed by other top-level objects,

  1187.        skip them until the simple index object is reached */

  1188.     while (ff_guidcmp(&g, &index_guid)) {

  1189.         int64_t gsize= avio_rl64(s->pb);

  1190.         if (gsize < 24 || url_feof(s->pb)) {

  1191.             avio_seek(s->pb, current_pos, SEEK_SET);

  1192.             return;

  1193.         }

  1194.         avio_skip(s->pb, gsize-24);

  1195.         ff_get_guid(s->pb, &g);

  1196.     }

  1197. 

  1198.     {

  1199.         int64_t itime, last_pos=-1;

  1200.         int pct, ict;

  1201.         int64_t av_unused gsize= avio_rl64(s->pb);

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

  1203.         itime=avio_rl64(s->pb);

  1204.         pct=avio_rl32(s->pb);

  1205.         ict=avio_rl32(s->pb);

  1206.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1207. 

  1208.         for (i=0;i<ict;i++){

  1209.             int pktnum=avio_rl32(s->pb);

  1210.             int pktct =avio_rl16(s->pb);

  1211.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1212.             int64_t index_pts= FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);

  1213. 

  1214.             if(pos != last_pos){

  1215.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d  pts: %"PRId64"\n", pktnum, pktct, index_pts);

  1216.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1217.             last_pos=pos;

  1218.             }

  1219.         }

  1220.         asf->index_read= 1;

  1221.     }

  1222.     avio_seek(s->pb, current_pos, SEEK_SET);

  1223. }

  1224. 

  1225. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1226. {

  1227.     ASFContext *asf = s->priv_data;

  1228.     AVStream *st = s->streams[stream_index];

  1229.     int64_t pos;

  1230.     int index;

  1231. 

  1232.     if (s->packet_size <= 0)

  1233.         return -1;

  1234. 

  1235.     /* Try using the protocol's read_seek if available */

  1236.     if(s->pb) {

  1237.         int ret = ffio_read_seek(s->pb, stream_index, pts, flags);

  1238.         if(ret >= 0)

  1239.             asf_reset_header(s);

  1240.         if (ret != AVERROR(ENOSYS))

  1241.             return ret;

  1242.     }

  1243. 

  1244.     if (!asf->index_read)

  1245.         asf_build_simple_index(s, stream_index);

  1246. 

  1247.     if(!(asf->index_read && st->index_entries)){

  1248.         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)

  1249.             return -1;

  1250.     }else{

  1251.         index= av_index_search_timestamp(st, pts, flags);

  1252.         if(index<0)

  1253.             return -1;

  1254. 

  1255.         /* find the position */

  1256.         pos = st->index_entries[index].pos;

  1257. 

  1258.     // various attempts to find key frame have failed so far

  1259.     //    asf_reset_header(s);

  1260.     //    avio_seek(s->pb, pos, SEEK_SET);

  1261.     //    key_pos = pos;

  1262.     //     for(i=0;i<16;i++){

  1263.     //         pos = avio_tell(s->pb);

  1264.     //         if (av_read_frame(s, &pkt) < 0){

  1265.     //             av_log(s, AV_LOG_INFO, "seek failed\n");

  1266.     //             return -1;

  1267.     //         }

  1268.     //         asf_st = s->streams[stream_index]->priv_data;

  1269.     //         pos += st->parser->frame_offset;

  1270.     //

  1271.     //         if (pkt.size > b) {

  1272.     //             b = pkt.size;

  1273.     //             key_pos = pos;

  1274.     //         }

  1275.     //

  1276.     //         av_free_packet(&pkt);

  1277.     //     }

  1278. 

  1279.         /* do the seek */

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

  1281.         avio_seek(s->pb, pos, SEEK_SET);

  1282.     }

  1283.     asf_reset_header(s);

  1284.     return 0;

  1285. }

  1286. 

  1287. AVInputFormat ff_asf_demuxer = {

  1288.     "asf",

  1289.     NULL_IF_CONFIG_SMALL("ASF format"),

  1290.     sizeof(ASFContext),

  1291.     asf_probe,

  1292.     asf_read_header,

  1293.     asf_read_packet,

  1294.     asf_read_close,

  1295.     asf_read_seek,

  1296.     asf_read_pts,

  1297. };