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FFmpeg/libavformat/asfdec.c

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  1. /*

  2.  * ASF compatible demuxer

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

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. //#define DEBUG

  23. 

  24. #include "libavutil/bswap.h"

  25. #include "libavutil/common.h"

  26. #include "libavutil/avstring.h"

  27. #include "libavutil/dict.h"

  28. #include "libavutil/mathematics.h"

  29. #include "libavcodec/mpegaudio.h"

  30. #include "avformat.h"

  31. #include "internal.h"

  32. #include "avio_internal.h"

  33. #include "riff.h"

  34. #include "asf.h"

  35. #include "asfcrypt.h"

  36. #include "avlanguage.h"

  37. 

  38. typedef struct {

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

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

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

  42.     AVRational dar[128];

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

  44.     /* non streamed additonnal info */

  45.     /* packet filling */

  46.     int packet_size_left;

  47.     /* only for reading */

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

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

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

  51.     int index_read;

  52. 

  53.     ASFMainHeader hdr;

  54. 

  55.     int packet_flags;

  56.     int packet_property;

  57.     int packet_timestamp;

  58.     int packet_segsizetype;

  59.     int packet_segments;

  60.     int packet_seq;

  61.     int packet_replic_size;

  62.     int packet_key_frame;

  63.     int packet_padsize;

  64.     unsigned int packet_frag_offset;

  65.     unsigned int packet_frag_size;

  66.     int64_t packet_frag_timestamp;

  67.     int packet_multi_size;

  68.     int packet_obj_size;

  69.     int packet_time_delta;

  70.     int packet_time_start;

  71.     int64_t packet_pos;

  72. 

  73.     int stream_index;

  74. 

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

  76. } ASFContext;

  77. 

  78. #undef NDEBUG

  79. #include <assert.h>

  80. 

  81. #define ASF_MAX_STREAMS 127

  82. #define FRAME_HEADER_SIZE 17

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

  84. 

  85. static const ff_asf_guid index_guid = {

  86.     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb

  87. };

  88. 

  89. #ifdef DEBUG

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

  91.     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2

  92. };

  93. 

  94. #define PRINT_IF_GUID(g,cmp) \

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

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

  97. 

  98. static void print_guid(const ff_asf_guid *g)

  99. {

  100.     int i;

  101.     PRINT_IF_GUID(g, ff_asf_header);

  102.     else PRINT_IF_GUID(g, ff_asf_file_header);

  103.     else PRINT_IF_GUID(g, ff_asf_stream_header);

  104.     else PRINT_IF_GUID(g, ff_asf_audio_stream);

  105.     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);

  106.     else PRINT_IF_GUID(g, ff_asf_video_stream);

  107.     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);

  108.     else PRINT_IF_GUID(g, ff_asf_command_stream);

  109.     else PRINT_IF_GUID(g, ff_asf_comment_header);

  110.     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);

  111.     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);

  112.     else PRINT_IF_GUID(g, ff_asf_data_header);

  113.     else PRINT_IF_GUID(g, index_guid);

  114.     else PRINT_IF_GUID(g, ff_asf_head1_guid);

  115.     else PRINT_IF_GUID(g, ff_asf_head2_guid);

  116.     else PRINT_IF_GUID(g, ff_asf_my_guid);

  117.     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);

  118.     else PRINT_IF_GUID(g, ff_asf_extended_content_header);

  119.     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);

  120.     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);

  121.     else PRINT_IF_GUID(g, ff_asf_metadata_header);

  122.     else PRINT_IF_GUID(g, ff_asf_marker_header);

  123.     else PRINT_IF_GUID(g, stream_bitrate_guid);

  124.     else PRINT_IF_GUID(g, ff_asf_language_guid);

  125.     else

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

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

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

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

  130. }

  131. #undef PRINT_IF_GUID

  132. #else

  133. #define print_guid(g)

  134. #endif

  135. 

  136. static int asf_probe(AVProbeData *pd)

  137. {

  138.     /* check file header */

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

  140.         return AVPROBE_SCORE_MAX;

  141.     else

  142.         return 0;

  143. }

  144. 

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

  146.     switch(type){

  147.         case 2: return avio_rl32(pb);

  148.         case 3: return avio_rl32(pb);

  149.         case 4: return avio_rl64(pb);

  150.         case 5: return avio_rl16(pb);

  151.         default:return INT_MIN;

  152.     }

  153. }

  154. 

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

  156. {

  157.     char *value;

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

  159. 

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

  161.         return;

  162. 

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

  164.     if (!value)

  165.         goto finish;

  166. 

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

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

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

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

  171.         value[len]=0;

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

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

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

  175.     } else {

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

  177.         goto finish;

  178.     }

  179.     if (*value)

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

  181. finish:

  182.     av_freep(&value);

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

  184. }

  185. 

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

  187. {

  188.     ASFContext *asf = s->priv_data;

  189.     AVIOContext *pb = s->pb;

  190. 

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

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

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

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

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

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

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

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

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

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

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

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

  203.         return AVERROR_INVALIDDATA;

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

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

  206. 

  207.     return 0;

  208. }

  209. 

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

  211. {

  212.     ASFContext *asf = s->priv_data;

  213.     AVIOContext *pb = s->pb;

  214.     AVStream *st;

  215.     ASFStream *asf_st;

  216.     ff_asf_guid g;

  217.     enum AVMediaType type;

  218.     int type_specific_size, sizeX;

  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 = avformat_new_stream(s, NULL);

  231.     if (!st)

  232.         return AVERROR(ENOMEM);

  233.     avpriv_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.     avio_skip(pb, 8); /* total_size */

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

  291.         if (ret < 0)

  292.             return ret;

  293.         if (is_dvr_ms_audio) {

  294.             // codec_id and codec_tag are unreliable in dvr_ms

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

  296.             st->request_probe= 1;

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

  298.         }

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

  300.             st->need_parsing = AVSTREAM_PARSE_NONE;

  301.         } else {

  302.             st->need_parsing = AVSTREAM_PARSE_FULL;

  303.         }

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

  305.         pos2 = avio_tell(pb);

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

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

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

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

  310.             avio_rl16(pb); //ds_data_size

  311.             avio_r8(pb);   //ds_silence_data

  312.         }

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

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

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

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

  317.             if (!asf_st->ds_chunk_size

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

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

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

  321.         }

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

  323.             case CODEC_ID_MP3:

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

  325.                 break;

  326.             case CODEC_ID_PCM_S16LE:

  327.             case CODEC_ID_PCM_S16BE:

  328.             case CODEC_ID_PCM_U16LE:

  329.             case CODEC_ID_PCM_U16BE:

  330.             case CODEC_ID_PCM_S8:

  331.             case CODEC_ID_PCM_U8:

  332.             case CODEC_ID_PCM_ALAW:

  333.             case CODEC_ID_PCM_MULAW:

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

  335.                 break;

  336.             default:

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

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

  339.                 break;

  340.         }

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

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

  343.         avio_rl32(pb);

  344.         avio_rl32(pb);

  345.         avio_r8(pb);

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

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

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

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

  350.         /* not available for asf */

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

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

  353.         tag1 = avio_rl32(pb);

  354.         avio_skip(pb, 20);

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

  356.         if (sizeX > 40) {

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

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

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

  360.         }

  361. 

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

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

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

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

  366.             int av_unused i;

  367. #if HAVE_BIGENDIAN

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

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

  370. #else

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

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

  373. #endif

  374.             asf_st->palette_changed = 1;

  375.         }

  376. 

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

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

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

  380.             st->need_parsing = AVSTREAM_PARSE_FULL;

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

  382.             st->codec->width  =

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

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

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

  386.         }

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

  388.             st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;

  389.     }

  390.     pos2 = avio_tell(pb);

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

  392. 

  393.     return 0;

  394. }

  395. 

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

  397. {

  398.     ASFContext *asf = s->priv_data;

  399.     AVIOContext *pb = s->pb;

  400.     ff_asf_guid g;

  401.     int ext_len, payload_ext_ct, stream_ct, i;

  402.     uint32_t leak_rate, stream_num;

  403.     unsigned int stream_languageid_index;

  404. 

  405.     avio_rl64(pb); // starttime

  406.     avio_rl64(pb); // endtime

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

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

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

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

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

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

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

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

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

  416. 

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

  418.     if (stream_num < 128)

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

  420. 

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

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

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

  424. 

  425.     if (stream_num < 128)

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

  427. 

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

  429.         avio_rl16(pb);

  430.         ext_len = avio_rl16(pb);

  431.         avio_skip(pb, ext_len);

  432.     }

  433. 

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

  435.         ff_get_guid(pb, &g);

  436.         avio_skip(pb, 2);

  437.         ext_len=avio_rl32(pb);

  438.         avio_skip(pb, ext_len);

  439.     }

  440. 

  441.     return 0;

  442. }

  443. 

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

  445. {

  446.     AVIOContext *pb = s->pb;

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

  448. 

  449.     len1 = avio_rl16(pb);

  450.     len2 = avio_rl16(pb);

  451.     len3 = avio_rl16(pb);

  452.     len4 = avio_rl16(pb);

  453.     len5 = avio_rl16(pb);

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

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

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

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

  458.     avio_skip(pb, len5);

  459. 

  460.     return 0;

  461. }

  462. 

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

  464. {

  465.     AVIOContext *pb = s->pb;

  466.     ASFContext *asf = s->priv_data;

  467.     int desc_count, i, ret;

  468. 

  469.     desc_count = avio_rl16(pb);

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

  471.         int name_len,value_type,value_len;

  472.         char name[1024];

  473. 

  474.         name_len = avio_rl16(pb);

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

  476.             name_len += 1;

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

  478.             avio_skip(pb, name_len - ret);

  479.         value_type = avio_rl16(pb);

  480.         value_len  = avio_rl16(pb);

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

  482.             value_len += 1;

  483.         /**

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

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

  486.          */

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

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

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

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

  491.         } else

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

  493.     }

  494. 

  495.     return 0;

  496. }

  497. 

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

  499. {

  500.     AVIOContext *pb = s->pb;

  501.     ASFContext *asf = s->priv_data;

  502.     int j, ret;

  503.     int stream_count = avio_rl16(pb);

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

  505.         char lang[6];

  506.         unsigned int lang_len = avio_r8(pb);

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

  508.             avio_skip(pb, lang_len - ret);

  509.         if (j < 128)

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

  511.     }

  512. 

  513.     return 0;

  514. }

  515. 

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

  517. {

  518.     AVIOContext *pb = s->pb;

  519.     ASFContext *asf = s->priv_data;

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

  521.     int ret, i;

  522.     n = avio_rl16(pb);

  523. 

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

  525.         char name[1024];

  526. 

  527.         avio_rl16(pb); //lang_list_index

  528.         stream_num= avio_rl16(pb);

  529.         name_len=   avio_rl16(pb);

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

  531.         value_len=  avio_rl32(pb);

  532. 

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

  534.             avio_skip(pb, name_len - ret);

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

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

  537.         avio_skip(pb, value_len - 2);

  538. 

  539.         if(stream_num<128){

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

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

  542.         }

  543.     }

  544. 

  545.     return 0;

  546. }

  547. 

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

  549. {

  550.     AVIOContext *pb = s->pb;

  551.     int i, count, name_len, ret;

  552.     char name[1024];

  553. 

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

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

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

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

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

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

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

  561.     }

  562. 

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

  564.         int64_t pres_time;

  565.         int name_len;

  566. 

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

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

  569.         avio_rl16(pb);             // entry length

  570.         avio_rl32(pb);             // send time

  571.         avio_rl32(pb);             // flags

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

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

  574.             avio_skip(pb, name_len - ret);

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

  576.     }

  577. 

  578.     return 0;

  579. }

  580. 

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

  582. {

  583.     ASFContext *asf = s->priv_data;

  584.     ff_asf_guid g;

  585.     AVIOContext *pb = s->pb;

  586.     int i;

  587.     int64_t gsize;

  588. 

  589.     ff_get_guid(pb, &g);

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

  591.         return -1;

  592.     avio_rl64(pb);

  593.     avio_rl32(pb);

  594.     avio_r8(pb);

  595.     avio_r8(pb);

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

  597.     for(;;) {

  598.         uint64_t gpos= avio_tell(pb);

  599.         ff_get_guid(pb, &g);

  600.         gsize = avio_rl64(pb);

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

  602.         print_guid(&g);

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

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

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

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

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

  608.                 asf->data_object_size = gsize - 24;

  609.             } else {

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

  611.             }

  612.             break;

  613.         }

  614.         if (gsize < 24)

  615.             return -1;

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

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

  618.             if (ret < 0)

  619.                 return ret;

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

  621.             asf_read_stream_properties(s, gsize);

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

  623.             asf_read_content_desc(s, gsize);

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

  625.             asf_read_language_list(s, gsize);

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

  627.             asf_read_ext_content_desc(s, gsize);

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

  629.             asf_read_metadata(s, gsize);

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

  631.             asf_read_ext_stream_properties(s, gsize);

  632. 

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

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

  635.             continue;

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

  637.             ff_get_guid(pb, &g);

  638.             avio_skip(pb, 6);

  639.             continue;

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

  641.             asf_read_marker(s, gsize);

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

  643.             return -1;

  644.         } else {

  645.             if (!s->keylen) {

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

  647.                     unsigned int len;

  648.                     AVPacket pkt;

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

  650.                     len= avio_rl32(pb);

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

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

  653.                     len= avio_rl32(pb);

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

  655.                     len= avio_rl32(pb);

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

  657.                     len= avio_rl32(pb);

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

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

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

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

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

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

  664.                 }

  665.             }

  666.         }

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

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

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

  670.     }

  671.     ff_get_guid(pb, &g);

  672.     avio_rl64(pb);

  673.     avio_r8(pb);

  674.     avio_r8(pb);

  675.     if (url_feof(pb))

  676.         return -1;

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

  678.     asf->packet_size_left = 0;

  679. 

  680. 

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

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

  683.         if(stream_num>=0){

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

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

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

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

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

  689.                           &st->sample_aspect_ratio.den,

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

  691.             } 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.

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

  693.                           &st->sample_aspect_ratio.den,

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

  695. 

  696. //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);

  697. 

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

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

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

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

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

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

  704.                     if (iso6392)

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

  706.                 }

  707.             }

  708.         }

  709.     }

  710. 

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

  712. 

  713.     return 0;

  714. }

  715. 

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

  717.     switch (bits & 3) \

  718.     { \

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

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

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

  722.     default: var = defval; break; \

  723.     }

  724. 

  725. /**

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

  727.  * @param s demux context

  728.  * @param pb context to read data from

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

  730.  */

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

  732. {

  733.     ASFContext *asf = s->priv_data;

  734.     uint32_t packet_length, padsize;

  735.     int rsize = 8;

  736.     int c, d, e, off;

  737. 

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

  739.     off= 32768;

  740.     if (s->packet_size > 0)

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

  742. 

  743.     c=d=e=-1;

  744.     while(off-- > 0){

  745.         c=d; d=e;

  746.         e= avio_r8(pb);

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

  748.             break;

  749.     }

  750. 

  751.     if (c != 0x82) {

  752.         /**

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

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

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

  756.          * the stream.

  757.          */

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

  759.             return AVERROR(EAGAIN);

  760.         if (!url_feof(pb))

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

  762.     }

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

  764.         if (d || e) {

  765.             if (!url_feof(pb))

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

  767.             return -1;

  768.         }

  769.         c= avio_r8(pb);

  770.         d= avio_r8(pb);

  771.         rsize+=3;

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

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

  774.     }

  775. 

  776.     asf->packet_flags    = c;

  777.     asf->packet_property = d;

  778. 

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

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

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

  782. 

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

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

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

  786.         return -1;

  787.     }

  788.     if(padsize >= packet_length){

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

  790.         return -1;

  791.     }

  792. 

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

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

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

  796. 

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

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

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

  800.     } else {

  801.         asf->packet_segments = 1;

  802.         asf->packet_segsizetype = 0x80;

  803.     }

  804.     if (rsize > packet_length - padsize) {

  805.         asf->packet_size_left = 0;

  806.         av_log(s, AV_LOG_ERROR,

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

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

  809.         return -1;

  810.     }

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

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

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

  814.     asf->packet_padsize = padsize;

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

  816.     return 0;

  817. }

  818. 

  819. /**

  820.  *

  821.  * @return <0 if error

  822.  */

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

  824.     ASFContext *asf = s->priv_data;

  825.     int rsize = 1;

  826.     int num = avio_r8(pb);

  827.     int64_t ts0, ts1 av_unused;

  828. 

  829.     asf->packet_segments--;

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

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

  832.     // sequence should be ignored!

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

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

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

  836. //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);

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

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

  839.         return -1;

  840.     }

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

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

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

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

  845.             return -1;

  846.         }

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

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

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

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

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

  852.             avio_skip(pb, 10);

  853.             ts0= avio_rl64(pb);

  854.             ts1= avio_rl64(pb);

  855.             avio_skip(pb, 12);

  856.             avio_rl32(pb);

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

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

  859.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  860.         }else

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

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

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

  864.         // multipacket - frag_offset is beginning timestamp

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

  866.         asf->packet_frag_offset = 0;

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

  868. 

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

  870.         rsize++;

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

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

  873.         return -1;

  874.     }

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

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

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

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

  879.             return -1;

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

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

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

  883.                 return -1;

  884.             } else {

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

  886.                 asf->packet_size_left += diff;

  887.                 asf->packet_padsize   -= diff;

  888.             }

  889.         }

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

  891.     } else {

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

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

  894.     }

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

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

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

  898.             return -1;

  899.     }

  900.     asf->packet_size_left -= rsize;

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

  902. 

  903.     return 0;

  904. }

  905. 

  906. /**

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

  908.  * with asf_get_packet()).

  909.  * @param s demux context

  910.  * @param pb context to read data from

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

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

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

  914.  */

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

  916. {

  917.     ASFContext *asf = s->priv_data;

  918.     ASFStream *asf_st = 0;

  919.     for (;;) {

  920.         int ret;

  921.         if(url_feof(pb))

  922.             return AVERROR_EOF;

  923.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  928.             assert(ret>=0);

  929.             /* fail safe */

  930.             avio_skip(pb, ret);

  931. 

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

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

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

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

  936.             return 1;

  937.         }

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

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

  940.                 asf->packet_segments= 0;

  941.                 continue;

  942.             }

  943.             if (asf->stream_index < 0

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

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

  946.                 ) {

  947.                 asf->packet_time_start = 0;

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

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

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

  951.                 if(asf->stream_index < 0)

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

  953.                 continue;

  954.             }

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

  956.         }

  957.         asf_st = asf->asf_st;

  958. 

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

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

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

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

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

  964.             asf->packet_size_left--;

  965.             asf->packet_multi_size--;

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

  967.             {

  968.                 asf->packet_time_start = 0;

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

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

  971.                 continue;

  972.             }

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

  974.             //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);

  975.         }

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

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

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

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

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

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

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

  983.         }

  984. 

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

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

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

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

  989.                 asf_st->frag_offset = 0;

  990.                 av_free_packet(&asf_st->pkt);

  991.             }

  992.             /* new packet */

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

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

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

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

  997.             asf_st->pkt.pos =

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

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

  1000.                 uint8_t *pal;

  1001.                 pal = av_packet_new_side_data(&asf_st->pkt, AV_PKT_DATA_PALETTE,

  1002.                                               AVPALETTE_SIZE);

  1003.                 if (!pal) {

  1004.                     av_log(s, AV_LOG_ERROR, "Cannot append palette to packet\n");

  1005.                 } else {

  1006.                     memcpy(pal, asf_st->palette, AVPALETTE_SIZE);

  1007.                     asf_st->palette_changed = 0;

  1008.                 }

  1009.             }

  1010. //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",

  1011. //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,

  1012. //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);

  1013.             if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)

  1014.                 asf->packet_key_frame = 1;

  1015.             if (asf->packet_key_frame)

  1016.                 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;

  1017.         }

  1018. 

  1019.         /* read data */

  1020.         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",

  1021.         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,

  1022.         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);

  1023.         asf->packet_size_left -= asf->packet_frag_size;

  1024.         if (asf->packet_size_left < 0)

  1025.             continue;

  1026. 

  1027.         if(   asf->packet_frag_offset >= asf_st->pkt.size

  1028.            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){

  1029.             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",

  1030.                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);

  1031.             continue;

  1032.         }

  1033. 

  1034.         ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,

  1035.                          asf->packet_frag_size);

  1036.         if (ret != asf->packet_frag_size) {

  1037.             if (ret < 0 || asf->packet_frag_offset + ret == 0)

  1038.                 return ret < 0 ? ret : AVERROR_EOF;

  1039.             if (asf_st->ds_span > 1) {

  1040.                 // scrambling, we can either drop it completely or fill the remainder

  1041.                 // TODO: should we fill the whole packet instead of just the current

  1042.                 // fragment?

  1043.                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,

  1044.                        asf->packet_frag_size - ret);

  1045.                 ret = asf->packet_frag_size;

  1046.             } else

  1047.                 // no scrambling, so we can return partial packets

  1048.                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);

  1049.         }

  1050.         if (s->key && s->keylen == 20)

  1051.             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,

  1052.                             ret);

  1053.         asf_st->frag_offset += ret;

  1054.         /* test if whole packet is read */

  1055.         if (asf_st->frag_offset == asf_st->pkt.size) {

  1056.             //workaround for macroshit radio DVR-MS files

  1057.             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO

  1058.                && asf_st->pkt.size > 100){

  1059.                 int i;

  1060.                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);

  1061.                 if(i == asf_st->pkt.size){

  1062.                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");

  1063.                     asf_st->frag_offset = 0;

  1064.                     av_free_packet(&asf_st->pkt);

  1065.                     continue;

  1066.                 }

  1067.             }

  1068. 

  1069.             /* return packet */

  1070.             if (asf_st->ds_span > 1) {

  1071.               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){

  1072.                     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);

  1073.               }else{

  1074.                 /* packet descrambling */

  1075.                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);

  1076.                 if (newdata) {

  1077.                     int offset = 0;

  1078.                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

  1079.                     while (offset < asf_st->pkt.size) {

  1080.                         int off = offset / asf_st->ds_chunk_size;

  1081.                         int row = off / asf_st->ds_span;

  1082.                         int col = off % asf_st->ds_span;

  1083.                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;

  1084.                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);

  1085. 

  1086.                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);

  1087.                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);

  1088.                         memcpy(newdata + offset,

  1089.                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,

  1090.                                asf_st->ds_chunk_size);

  1091.                         offset += asf_st->ds_chunk_size;

  1092.                     }

  1093.                     av_free(asf_st->pkt.data);

  1094.                     asf_st->pkt.data = newdata;

  1095.                 }

  1096.               }

  1097.             }

  1098.             asf_st->frag_offset = 0;

  1099.             *pkt= asf_st->pkt;

  1100.             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);

  1101.             asf_st->pkt.size = 0;

  1102.             asf_st->pkt.data = 0;

  1103.             asf_st->pkt.side_data_elems = 0;

  1104.             asf_st->pkt.side_data = NULL;

  1105.             break; // packet completed

  1106.         }

  1107.     }

  1108.     return 0;

  1109. }

  1110. 

  1111. static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)

  1112. {

  1113.     ASFContext *asf = s->priv_data;

  1114. 

  1115.     for (;;) {

  1116.         int ret;

  1117. 

  1118.         /* parse cached packets, if any */

  1119.         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)

  1120.             return ret;

  1121.         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)

  1122.             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);

  1123.         asf->packet_time_start = 0;

  1124.     }

  1125. }

  1126. 

  1127. // Added to support seeking after packets have been read

  1128. // If information is not reset, read_packet fails due to

  1129. // leftover information from previous reads

  1130. static void asf_reset_header(AVFormatContext *s)

  1131. {

  1132.     ASFContext *asf = s->priv_data;

  1133.     ASFStream *asf_st;

  1134.     int i;

  1135. 

  1136.     asf->packet_size_left = 0;

  1137.     asf->packet_segments = 0;

  1138.     asf->packet_flags = 0;

  1139.     asf->packet_property = 0;

  1140.     asf->packet_timestamp = 0;

  1141.     asf->packet_segsizetype = 0;

  1142.     asf->packet_segments = 0;

  1143.     asf->packet_seq = 0;

  1144.     asf->packet_replic_size = 0;

  1145.     asf->packet_key_frame = 0;

  1146.     asf->packet_padsize = 0;

  1147.     asf->packet_frag_offset = 0;

  1148.     asf->packet_frag_size = 0;

  1149.     asf->packet_frag_timestamp = 0;

  1150.     asf->packet_multi_size = 0;

  1151.     asf->packet_obj_size = 0;

  1152.     asf->packet_time_delta = 0;

  1153.     asf->packet_time_start = 0;

  1154. 

  1155.     for(i=0; i<s->nb_streams; i++){

  1156.         asf_st= s->streams[i]->priv_data;

  1157.         av_free_packet(&asf_st->pkt);

  1158.         asf_st->frag_offset=0;

  1159.         asf_st->seq=0;

  1160.     }

  1161.     asf->asf_st= NULL;

  1162. }

  1163. 

  1164. static int asf_read_close(AVFormatContext *s)

  1165. {

  1166.     asf_reset_header(s);

  1167. 

  1168.     return 0;

  1169. }

  1170. 

  1171. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  1172. {

  1173.     AVPacket pkt1, *pkt = &pkt1;

  1174.     ASFStream *asf_st;

  1175.     int64_t pts;

  1176.     int64_t pos= *ppos;

  1177.     int i;

  1178.     int64_t start_pos[ASF_MAX_STREAMS];

  1179. 

  1180.     for(i=0; i<s->nb_streams; i++){

  1181.         start_pos[i]= pos;

  1182.     }

  1183. 

  1184.     if (s->packet_size > 0)

  1185.         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;

  1186.     *ppos= pos;

  1187.     if (avio_seek(s->pb, pos, SEEK_SET) < 0)

  1188.         return AV_NOPTS_VALUE;

  1189. 

  1190. //printf("asf_read_pts\n");

  1191.     asf_reset_header(s);

  1192.     for(;;){

  1193.         if (av_read_frame(s, pkt) < 0){

  1194.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1195.             return AV_NOPTS_VALUE;

  1196.         }

  1197. 

  1198.         pts = pkt->dts;

  1199. 

  1200.         av_free_packet(pkt);

  1201.         if(pkt->flags&AV_PKT_FLAG_KEY){

  1202.             i= pkt->stream_index;

  1203. 

  1204.             asf_st= s->streams[i]->priv_data;

  1205. 

  1206. //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);

  1207.             pos= asf_st->packet_pos;

  1208. 

  1209.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1210.             start_pos[i]= asf_st->packet_pos + 1;

  1211. 

  1212.             if(pkt->stream_index == stream_index)

  1213.                break;

  1214.         }

  1215.     }

  1216. 

  1217.     *ppos= pos;

  1218. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1219. 

  1220.     return pts;

  1221. }

  1222. 

  1223. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1224. {

  1225.     ff_asf_guid g;

  1226.     ASFContext *asf = s->priv_data;

  1227.     int64_t current_pos= avio_tell(s->pb);

  1228. 

  1229.     if(avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET) < 0) {

  1230.         asf->index_read= -1;

  1231.         return;

  1232.     }

  1233. 

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

  1235. 

  1236.     /* the data object can be followed by other top-level objects,

  1237.        skip them until the simple index object is reached */

  1238.     while (ff_guidcmp(&g, &index_guid)) {

  1239.         int64_t gsize= avio_rl64(s->pb);

  1240.         if (gsize < 24 || url_feof(s->pb)) {

  1241.             avio_seek(s->pb, current_pos, SEEK_SET);

  1242.             asf->index_read= -1;

  1243.             return;

  1244.         }

  1245.         avio_skip(s->pb, gsize-24);

  1246.         ff_get_guid(s->pb, &g);

  1247.     }

  1248. 

  1249.     {

  1250.         int64_t itime, last_pos=-1;

  1251.         int pct, ict;

  1252.         int i;

  1253.         int64_t av_unused gsize= avio_rl64(s->pb);

  1254.         ff_get_guid(s->pb, &g);

  1255.         itime=avio_rl64(s->pb);

  1256.         pct=avio_rl32(s->pb);

  1257.         ict=avio_rl32(s->pb);

  1258.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1259. 

  1260.         for (i=0;i<ict;i++){

  1261.             int pktnum=avio_rl32(s->pb);

  1262.             int pktct =avio_rl16(s->pb);

  1263.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1264.             int64_t index_pts= FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);

  1265. 

  1266.             if(pos != last_pos){

  1267.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d  pts: %"PRId64"\n", pktnum, pktct, index_pts);

  1268.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1269.             last_pos=pos;

  1270.             }

  1271.         }

  1272.         asf->index_read= 1;

  1273.     }

  1274.     avio_seek(s->pb, current_pos, SEEK_SET);

  1275. }

  1276. 

  1277. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1278. {

  1279.     ASFContext *asf = s->priv_data;

  1280.     AVStream *st = s->streams[stream_index];

  1281. 

  1282.     if (s->packet_size <= 0)

  1283.         return -1;

  1284. 

  1285.     /* Try using the protocol's read_seek if available */

  1286.     if(s->pb) {

  1287.         int ret = avio_seek_time(s->pb, stream_index, pts, flags);

  1288.         if(ret >= 0)

  1289.             asf_reset_header(s);

  1290.         if (ret != AVERROR(ENOSYS))

  1291.             return ret;

  1292.     }

  1293. 

  1294.     if (!asf->index_read)

  1295.         asf_build_simple_index(s, stream_index);

  1296. 

  1297.     if((asf->index_read > 0 && st->index_entries)){

  1298.         int index= av_index_search_timestamp(st, pts, flags);

  1299.         if(index >= 0) {

  1300.             /* find the position */

  1301.             uint64_t pos = st->index_entries[index].pos;

  1302. 

  1303.             /* do the seek */

  1304.             av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1305.             if(avio_seek(s->pb, pos, SEEK_SET) < 0)

  1306.                 return -1;

  1307.             asf_reset_header(s);

  1308.             return 0;

  1309.         }

  1310.     }

  1311.     /* no index or seeking by index failed */

  1312.     if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)

  1313.         return -1;

  1314.     asf_reset_header(s);

  1315.     return 0;

  1316. }

  1317. 

  1318. AVInputFormat ff_asf_demuxer = {

  1319.     .name           = "asf",

  1320.     .long_name      = NULL_IF_CONFIG_SMALL("ASF format"),

  1321.     .priv_data_size = sizeof(ASFContext),

  1322.     .read_probe     = asf_probe,

  1323.     .read_header    = asf_read_header,

  1324.     .read_packet    = asf_read_packet,

  1325.     .read_close     = asf_read_close,

  1326.     .read_seek      = asf_read_seek,

  1327.     .read_timestamp = asf_read_pts,

  1328.     .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,

  1329. };