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FFmpeg/libavformat/asfdec.c

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  1. /*

  2.  * ASF compatible demuxer

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

  4.  *

  5.  * This file is part of Libav.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. //#define DEBUG

  23. 

  24. #include "libavutil/bswap.h"

  25. #include "libavutil/common.h"

  26. #include "libavutil/avstring.h"

  27. #include "libavutil/dict.h"

  28. #include "libavutil/mathematics.h"

  29. #include "avformat.h"

  30. #include "internal.h"

  31. #include "avio_internal.h"

  32. #include "riff.h"

  33. #include "asf.h"

  34. #include "asfcrypt.h"

  35. #include "avlanguage.h"

  36. 

  37. typedef struct {

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

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

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

  41.     AVRational dar[128];

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

  43.     /* non streamed additonnal info */

  44.     /* packet filling */

  45.     int packet_size_left;

  46.     /* only for reading */

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

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

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

  50.     int index_read;

  51. 

  52.     ASFMainHeader hdr;

  53. 

  54.     int packet_flags;

  55.     int packet_property;

  56.     int packet_timestamp;

  57.     int packet_segsizetype;

  58.     int packet_segments;

  59.     int packet_seq;

  60.     int packet_replic_size;

  61.     int packet_key_frame;

  62.     int packet_padsize;

  63.     unsigned int packet_frag_offset;

  64.     unsigned int packet_frag_size;

  65.     int64_t packet_frag_timestamp;

  66.     int packet_multi_size;

  67.     int packet_obj_size;

  68.     int packet_time_delta;

  69.     int packet_time_start;

  70.     int64_t packet_pos;

  71. 

  72.     int stream_index;

  73. 

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

  75. } ASFContext;

  76. 

  77. #undef NDEBUG

  78. #include <assert.h>

  79. 

  80. #define ASF_MAX_STREAMS 127

  81. #define FRAME_HEADER_SIZE 17

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

  83. 

  84. static const ff_asf_guid index_guid = {

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

  86. };

  87. 

  88. #ifdef DEBUG

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

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

  91. };

  92. 

  93. #define PRINT_IF_GUID(g,cmp) \

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

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

  96. 

  97. static void print_guid(const ff_asf_guid *g)

  98. {

  99.     int i;

  100.     PRINT_IF_GUID(g, ff_asf_header);

  101.     else PRINT_IF_GUID(g, ff_asf_file_header);

  102.     else PRINT_IF_GUID(g, ff_asf_stream_header);

  103.     else PRINT_IF_GUID(g, ff_asf_audio_stream);

  104.     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);

  105.     else PRINT_IF_GUID(g, ff_asf_video_stream);

  106.     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);

  107.     else PRINT_IF_GUID(g, ff_asf_command_stream);

  108.     else PRINT_IF_GUID(g, ff_asf_comment_header);

  109.     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);

  110.     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);

  111.     else PRINT_IF_GUID(g, ff_asf_data_header);

  112.     else PRINT_IF_GUID(g, index_guid);

  113.     else PRINT_IF_GUID(g, ff_asf_head1_guid);

  114.     else PRINT_IF_GUID(g, ff_asf_head2_guid);

  115.     else PRINT_IF_GUID(g, ff_asf_my_guid);

  116.     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);

  117.     else PRINT_IF_GUID(g, ff_asf_extended_content_header);

  118.     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);

  119.     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);

  120.     else PRINT_IF_GUID(g, ff_asf_metadata_header);

  121.     else PRINT_IF_GUID(g, ff_asf_marker_header);

  122.     else PRINT_IF_GUID(g, stream_bitrate_guid);

  123.     else PRINT_IF_GUID(g, ff_asf_language_guid);

  124.     else

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

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

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

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

  129. }

  130. #undef PRINT_IF_GUID

  131. #else

  132. #define print_guid(g)

  133. #endif

  134. 

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

  136. {

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

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

  139. }

  140. 

  141. static int asf_probe(AVProbeData *pd)

  142. {

  143.     /* check file header */

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

  145.         return AVPROBE_SCORE_MAX;

  146.     else

  147.         return 0;

  148. }

  149. 

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

  151.     switch(type){

  152.         case 2: return avio_rl32(pb);

  153.         case 3: return avio_rl32(pb);

  154.         case 4: return avio_rl64(pb);

  155.         case 5: return avio_rl16(pb);

  156.         default:return INT_MIN;

  157.     }

  158. }

  159. 

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

  161. {

  162.     char *value;

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

  164. 

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

  166.         return;

  167. 

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

  169.     if (!value)

  170.         goto finish;

  171. 

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

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

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

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

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

  177.     } else {

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

  179.         goto finish;

  180.     }

  181.     if (*value)

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

  183. finish:

  184.     av_freep(&value);

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

  186. }

  187. 

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

  189. {

  190.     ASFContext *asf = s->priv_data;

  191.     AVIOContext *pb = s->pb;

  192. 

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

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

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

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

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

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

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

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

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

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

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

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

  205.         return AVERROR_INVALIDDATA;

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

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

  208. 

  209.     return 0;

  210. }

  211. 

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

  213. {

  214.     ASFContext *asf = s->priv_data;

  215.     AVIOContext *pb = s->pb;

  216.     AVStream *st;

  217.     ASFStream *asf_st;

  218.     ff_asf_guid g;

  219.     enum AVMediaType type;

  220.     int type_specific_size, sizeX;

  221.     unsigned int tag1;

  222.     int64_t pos1, pos2, start_time;

  223.     int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  224. 

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

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

  227.         return AVERROR(EINVAL);

  228.     }

  229. 

  230.     pos1 = avio_tell(pb);

  231. 

  232.     st = avformat_new_stream(s, NULL);

  233.     if (!st)

  234.         return AVERROR(ENOMEM);

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

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

  237.     if (!asf_st)

  238.         return AVERROR(ENOMEM);

  239.     st->priv_data = asf_st;

  240.     st->start_time = 0;

  241.     start_time = asf->hdr.preroll;

  242. 

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

  244. 

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

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

  247.             (10000000 / 1000) - start_time;

  248.     }

  249.     ff_get_guid(pb, &g);

  250. 

  251.     test_for_ext_stream_audio = 0;

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

  253.         type = AVMEDIA_TYPE_AUDIO;

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

  255.         type = AVMEDIA_TYPE_VIDEO;

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

  257.         type = AVMEDIA_TYPE_VIDEO;

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

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

  260.         type = AVMEDIA_TYPE_DATA;

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

  262.         test_for_ext_stream_audio = 1;

  263.         type = AVMEDIA_TYPE_UNKNOWN;

  264.     } else {

  265.         return -1;

  266.     }

  267.     ff_get_guid(pb, &g);

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

  269.     type_specific_size = avio_rl32(pb);

  270.     avio_rl32(pb);

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

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

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

  274. 

  275.     avio_rl32(pb);

  276. 

  277.     if (test_for_ext_stream_audio) {

  278.         ff_get_guid(pb, &g);

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

  280.             type = AVMEDIA_TYPE_AUDIO;

  281.             is_dvr_ms_audio=1;

  282.             ff_get_guid(pb, &g);

  283.             avio_rl32(pb);

  284.             avio_rl32(pb);

  285.             avio_rl32(pb);

  286.             ff_get_guid(pb, &g);

  287.             avio_rl32(pb);

  288.         }

  289.     }

  290. 

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

  292.     if (type == AVMEDIA_TYPE_AUDIO) {

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

  294.         if (ret < 0)

  295.             return ret;

  296.         if (is_dvr_ms_audio) {

  297.             // codec_id and codec_tag are unreliable in dvr_ms

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

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

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

  301.         }

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

  303.             st->need_parsing = AVSTREAM_PARSE_NONE;

  304.         } else {

  305.             st->need_parsing = AVSTREAM_PARSE_FULL;

  306.         }

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

  308.         pos2 = avio_tell(pb);

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

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

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

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

  313.             avio_rl16(pb); //ds_data_size

  314.             avio_r8(pb);   //ds_silence_data

  315.         }

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

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

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

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

  320.             if (!asf_st->ds_chunk_size

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

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

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

  324.         }

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

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

  327.         avio_rl32(pb);

  328.         avio_rl32(pb);

  329.         avio_r8(pb);

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

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

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

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

  334.         /* not available for asf */

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

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

  337.         tag1 = avio_rl32(pb);

  338.         avio_skip(pb, 20);

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

  340.         if (sizeX > 40) {

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

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

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

  344.         }

  345. 

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

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

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

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

  350. #if HAVE_BIGENDIAN

  351.             int i;

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

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

  354. #else

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

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

  357. #endif

  358.             asf_st->palette_changed = 1;

  359.         }

  360. 

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

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

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

  364.             st->need_parsing = AVSTREAM_PARSE_FULL;

  365.             // 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

  366.             st->codec->width  =

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

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

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

  370.         }

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

  372.             st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;

  373.     }

  374.     pos2 = avio_tell(pb);

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

  376. 

  377.     return 0;

  378. }

  379. 

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

  381. {

  382.     ASFContext *asf = s->priv_data;

  383.     AVIOContext *pb = s->pb;

  384.     ff_asf_guid g;

  385.     int ext_len, payload_ext_ct, stream_ct, i;

  386.     uint32_t leak_rate, stream_num;

  387.     unsigned int stream_languageid_index;

  388. 

  389.     avio_rl64(pb); // starttime

  390.     avio_rl64(pb); // endtime

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

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

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

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

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

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

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

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

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

  400. 

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

  402.     if (stream_num < 128)

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

  404. 

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

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

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

  408. 

  409.     if (stream_num < 128)

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

  411. 

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

  413.         avio_rl16(pb);

  414.         ext_len = avio_rl16(pb);

  415.         avio_skip(pb, ext_len);

  416.     }

  417. 

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

  419.         ff_get_guid(pb, &g);

  420.         avio_skip(pb, 2);

  421.         ext_len=avio_rl32(pb);

  422.         avio_skip(pb, ext_len);

  423.     }

  424. 

  425.     return 0;

  426. }

  427. 

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

  429. {

  430.     AVIOContext *pb = s->pb;

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

  432. 

  433.     len1 = avio_rl16(pb);

  434.     len2 = avio_rl16(pb);

  435.     len3 = avio_rl16(pb);

  436.     len4 = avio_rl16(pb);

  437.     len5 = avio_rl16(pb);

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

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

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

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

  442.     avio_skip(pb, len5);

  443. 

  444.     return 0;

  445. }

  446. 

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

  448. {

  449.     AVIOContext *pb = s->pb;

  450.     ASFContext *asf = s->priv_data;

  451.     int desc_count, i, ret;

  452. 

  453.     desc_count = avio_rl16(pb);

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

  455.         int name_len,value_type,value_len;

  456.         char name[1024];

  457. 

  458.         name_len = avio_rl16(pb);

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

  460.             name_len += 1;

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

  462.             avio_skip(pb, name_len - ret);

  463.         value_type = avio_rl16(pb);

  464.         value_len  = avio_rl16(pb);

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

  466.             value_len += 1;

  467.         /**

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

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

  470.          */

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

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

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

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

  475.         } else

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

  477.     }

  478. 

  479.     return 0;

  480. }

  481. 

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

  483. {

  484.     AVIOContext *pb = s->pb;

  485.     ASFContext *asf = s->priv_data;

  486.     int j, ret;

  487.     int stream_count = avio_rl16(pb);

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

  489.         char lang[6];

  490.         unsigned int lang_len = avio_r8(pb);

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

  492.             avio_skip(pb, lang_len - ret);

  493.         if (j < 128)

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

  495.     }

  496. 

  497.     return 0;

  498. }

  499. 

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

  501. {

  502.     AVIOContext *pb = s->pb;

  503.     ASFContext *asf = s->priv_data;

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

  505.     int ret, i;

  506.     n = avio_rl16(pb);

  507. 

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

  509.         char name[1024];

  510. 

  511.         avio_rl16(pb); //lang_list_index

  512.         stream_num= avio_rl16(pb);

  513.         name_len=   avio_rl16(pb);

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

  515.         value_len=  avio_rl32(pb);

  516. 

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

  518.             avio_skip(pb, name_len - ret);

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

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

  521.         avio_skip(pb, value_len - 2);

  522. 

  523.         if(stream_num<128){

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

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

  526.         }

  527.     }

  528. 

  529.     return 0;

  530. }

  531. 

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

  533. {

  534.     AVIOContext *pb = s->pb;

  535.     int i, count, name_len, ret;

  536.     char name[1024];

  537. 

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

  539.     avio_rl64(pb);            // ...

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

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

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

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

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

  545.     }

  546. 

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

  548.         int64_t pres_time;

  549.         int name_len;

  550. 

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

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

  553.         avio_rl16(pb);             // entry length

  554.         avio_rl32(pb);             // send time

  555.         avio_rl32(pb);             // flags

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

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

  558.             avio_skip(pb, name_len - ret);

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

  560.     }

  561. 

  562.     return 0;

  563. }

  564. 

  565. static int asf_read_header(AVFormatContext *s)

  566. {

  567.     ASFContext *asf = s->priv_data;

  568.     ff_asf_guid g;

  569.     AVIOContext *pb = s->pb;

  570.     int i;

  571.     int64_t gsize;

  572. 

  573.     ff_get_guid(pb, &g);

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

  575.         return -1;

  576.     avio_rl64(pb);

  577.     avio_rl32(pb);

  578.     avio_r8(pb);

  579.     avio_r8(pb);

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

  581.     for(;;) {

  582.         uint64_t gpos= avio_tell(pb);

  583.         ff_get_guid(pb, &g);

  584.         gsize = avio_rl64(pb);

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

  586.         print_guid(&g);

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

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

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

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

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

  592.                 asf->data_object_size = gsize - 24;

  593.             } else {

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

  595.             }

  596.             break;

  597.         }

  598.         if (gsize < 24)

  599.             return -1;

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

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

  602.             if (ret < 0)

  603.                 return ret;

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

  605.             asf_read_stream_properties(s, gsize);

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

  607.             asf_read_content_desc(s, gsize);

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

  609.             asf_read_language_list(s, gsize);

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

  611.             asf_read_ext_content_desc(s, gsize);

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

  613.             asf_read_metadata(s, gsize);

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

  615.             asf_read_ext_stream_properties(s, gsize);

  616. 

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

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

  619.             continue;

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

  621.             ff_get_guid(pb, &g);

  622.             avio_skip(pb, 6);

  623.             continue;

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

  625.             asf_read_marker(s, gsize);

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

  627.             return -1;

  628.         } else {

  629.             if (!s->keylen) {

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

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

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

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

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

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

  636.                 }

  637.             }

  638.         }

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

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

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

  642.     }

  643.     ff_get_guid(pb, &g);

  644.     avio_rl64(pb);

  645.     avio_r8(pb);

  646.     avio_r8(pb);

  647.     if (pb->eof_reached)

  648.         return -1;

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

  650.     asf->packet_size_left = 0;

  651. 

  652. 

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

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

  655.         if(stream_num>=0){

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

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

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

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

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

  661.                           &st->sample_aspect_ratio.den,

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

  663.             } 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.

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

  665.                           &st->sample_aspect_ratio.den,

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

  667. 

  668. //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);

  669. 

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

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

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

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

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

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

  676.                     if (iso6392)

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

  678.                 }

  679.             }

  680.         }

  681.     }

  682. 

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

  684. 

  685.     return 0;

  686. }

  687. 

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

  689.     switch (bits & 3) \

  690.     { \

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

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

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

  694.     default: var = defval; break; \

  695.     }

  696. 

  697. /**

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

  699.  * @param s demux context

  700.  * @param pb context to read data from

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

  702.  */

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

  704. {

  705.     ASFContext *asf = s->priv_data;

  706.     uint32_t packet_length, padsize;

  707.     int rsize = 8;

  708.     int c, d, e, off;

  709. 

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

  711.     off= 32768;

  712.     if (s->packet_size > 0)

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

  714. 

  715.     c=d=e=-1;

  716.     while(off-- > 0){

  717.         c=d; d=e;

  718.         e= avio_r8(pb);

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

  720.             break;

  721.     }

  722. 

  723.     if (c != 0x82) {

  724.         /**

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

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

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

  728.          * the stream.

  729.          */

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

  731.             return AVERROR(EAGAIN);

  732.         if (!pb->eof_reached)

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

  734.     }

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

  736.         if (d || e) {

  737.             if (!pb->eof_reached)

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

  739.             return -1;

  740.         }

  741.         c= avio_r8(pb);

  742.         d= avio_r8(pb);

  743.         rsize+=3;

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

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

  746.     }

  747. 

  748.     asf->packet_flags    = c;

  749.     asf->packet_property = d;

  750. 

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

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

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

  754. 

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

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

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

  758.         return -1;

  759.     }

  760.     if(padsize >= packet_length){

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

  762.         return -1;

  763.     }

  764. 

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

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

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

  768. 

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

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

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

  772.     } else {

  773.         asf->packet_segments = 1;

  774.         asf->packet_segsizetype = 0x80;

  775.     }

  776.     if (rsize > packet_length - padsize) {

  777.         asf->packet_size_left = 0;

  778.         av_log(s, AV_LOG_ERROR,

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

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

  781.         return -1;

  782.     }

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

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

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

  786.     asf->packet_padsize = padsize;

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

  788.     return 0;

  789. }

  790. 

  791. /**

  792.  *

  793.  * @return <0 if error

  794.  */

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

  796.     ASFContext *asf = s->priv_data;

  797.     int rsize = 1;

  798.     int num = avio_r8(pb);

  799.     int64_t ts0;

  800. 

  801.     asf->packet_segments--;

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

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

  804.     // sequence should be ignored!

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

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

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

  808. //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);

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

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

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

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

  813.             return -1;

  814.         }

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

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

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

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

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

  820.             avio_skip(pb, 10);

  821.             ts0= avio_rl64(pb);

  822.             avio_skip(pb, 8);;

  823.             avio_skip(pb, 12);

  824.             avio_rl32(pb);

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

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

  827.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  828.         }else

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

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

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

  832.         // multipacket - frag_offset is beginning timestamp

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

  834.         asf->packet_frag_offset = 0;

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

  836. 

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

  838.         rsize++;

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

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

  841.         return -1;

  842.     }

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

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

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

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

  847.             return -1;

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

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

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

  851.                 return -1;

  852.             } else {

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

  854.                 asf->packet_size_left += diff;

  855.                 asf->packet_padsize   -= diff;

  856.             }

  857.         }

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

  859.     } else {

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

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

  862.             return -1;

  863.         }

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

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

  866.     }

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

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

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

  870.             return -1;

  871.     }

  872.     asf->packet_size_left -= rsize;

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

  874. 

  875.     return 0;

  876. }

  877. 

  878. /**

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

  880.  * with asf_get_packet()).

  881.  * @param s demux context

  882.  * @param pb context to read data from

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

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

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

  886.  */

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

  888. {

  889.     ASFContext *asf = s->priv_data;

  890.     ASFStream *asf_st = 0;

  891.     for (;;) {

  892.         int ret;

  893.         if(pb->eof_reached)

  894.             return AVERROR_EOF;

  895.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  900.             assert(ret>=0);

  901.             /* fail safe */

  902.             avio_skip(pb, ret);

  903. 

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

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

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

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

  908.             return 1;

  909.         }

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

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

  912.                 asf->packet_segments= 0;

  913.                 continue;

  914.             }

  915.             if (asf->stream_index < 0

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

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

  918.                 ) {

  919.                 asf->packet_time_start = 0;

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

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

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

  923.                 if(asf->stream_index < 0)

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

  925.                 continue;

  926.             }

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

  928.         }

  929.         asf_st = asf->asf_st;

  930. 

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

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

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

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

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

  936.             asf->packet_size_left--;

  937.             asf->packet_multi_size--;

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

  939.             {

  940.                 asf->packet_time_start = 0;

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

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

  943.                 continue;

  944.             }

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

  946.             //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);

  947.         }

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

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

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

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

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

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

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

  955.         }

  956. 

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

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

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

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

  961.                 asf_st->frag_offset = 0;

  962.                 av_free_packet(&asf_st->pkt);

  963.             }

  964.             /* new packet */

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

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

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

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

  969.             asf_st->pkt.pos =

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

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

  972.                 uint8_t *pal;

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

  974.                                               AVPALETTE_SIZE);

  975.                 if (!pal) {

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

  977.                 } else {

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

  979.                     asf_st->palette_changed = 0;

  980.                 }

  981.             }

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

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

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

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

  986.                 asf->packet_key_frame = 1;

  987.             if (asf->packet_key_frame)

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

  989.         }

  990. 

  991.         /* read data */

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

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

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

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

  996.         if (asf->packet_size_left < 0)

  997.             continue;

  998. 

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

  1000.            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){

  1001.             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",

  1002.                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);

  1003.             continue;

  1004.         }

  1005. 

  1006.         ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,

  1007.                          asf->packet_frag_size);

  1008.         if (ret != asf->packet_frag_size) {

  1009.             if (ret < 0 || asf->packet_frag_offset + ret == 0)

  1010.                 return ret < 0 ? ret : AVERROR_EOF;

  1011.             if (asf_st->ds_span > 1) {

  1012.                 // scrambling, we can either drop it completely or fill the remainder

  1013.                 // TODO: should we fill the whole packet instead of just the current

  1014.                 // fragment?

  1015.                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,

  1016.                        asf->packet_frag_size - ret);

  1017.                 ret = asf->packet_frag_size;

  1018.             } else

  1019.                 // no scrambling, so we can return partial packets

  1020.                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);

  1021.         }

  1022.         if (s->key && s->keylen == 20)

  1023.             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,

  1024.                             ret);

  1025.         asf_st->frag_offset += ret;

  1026.         /* test if whole packet is read */

  1027.         if (asf_st->frag_offset == asf_st->pkt.size) {

  1028.             //workaround for macroshit radio DVR-MS files

  1029.             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO

  1030.                && asf_st->pkt.size > 100){

  1031.                 int i;

  1032.                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);

  1033.                 if(i == asf_st->pkt.size){

  1034.                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");

  1035.                     asf_st->frag_offset = 0;

  1036.                     av_free_packet(&asf_st->pkt);

  1037.                     continue;

  1038.                 }

  1039.             }

  1040. 

  1041.             /* return packet */

  1042.             if (asf_st->ds_span > 1) {

  1043.               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){

  1044.                     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);

  1045.               }else{

  1046.                 /* packet descrambling */

  1047.                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);

  1048.                 if (newdata) {

  1049.                     int offset = 0;

  1050.                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

  1051.                     while (offset < asf_st->pkt.size) {

  1052.                         int off = offset / asf_st->ds_chunk_size;

  1053.                         int row = off / asf_st->ds_span;

  1054.                         int col = off % asf_st->ds_span;

  1055.                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;

  1056.                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);

  1057. 

  1058.                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);

  1059.                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);

  1060.                         memcpy(newdata + offset,

  1061.                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,

  1062.                                asf_st->ds_chunk_size);

  1063.                         offset += asf_st->ds_chunk_size;

  1064.                     }

  1065.                     av_free(asf_st->pkt.data);

  1066.                     asf_st->pkt.data = newdata;

  1067.                 }

  1068.               }

  1069.             }

  1070.             asf_st->frag_offset = 0;

  1071.             *pkt= asf_st->pkt;

  1072.             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);

  1073.             asf_st->pkt.size = 0;

  1074.             asf_st->pkt.data = 0;

  1075.             break; // packet completed

  1076.         }

  1077.     }

  1078.     return 0;

  1079. }

  1080. 

  1081. static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)

  1082. {

  1083.     ASFContext *asf = s->priv_data;

  1084. 

  1085.     for (;;) {

  1086.         int ret;

  1087. 

  1088.         /* parse cached packets, if any */

  1089.         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)

  1090.             return ret;

  1091.         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)

  1092.             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);

  1093.         asf->packet_time_start = 0;

  1094.     }

  1095. }

  1096. 

  1097. // Added to support seeking after packets have been read

  1098. // If information is not reset, read_packet fails due to

  1099. // leftover information from previous reads

  1100. static void asf_reset_header(AVFormatContext *s)

  1101. {

  1102.     ASFContext *asf = s->priv_data;

  1103.     ASFStream *asf_st;

  1104.     int i;

  1105. 

  1106.     asf->packet_size_left = 0;

  1107.     asf->packet_segments = 0;

  1108.     asf->packet_flags = 0;

  1109.     asf->packet_property = 0;

  1110.     asf->packet_timestamp = 0;

  1111.     asf->packet_segsizetype = 0;

  1112.     asf->packet_segments = 0;

  1113.     asf->packet_seq = 0;

  1114.     asf->packet_replic_size = 0;

  1115.     asf->packet_key_frame = 0;

  1116.     asf->packet_padsize = 0;

  1117.     asf->packet_frag_offset = 0;

  1118.     asf->packet_frag_size = 0;

  1119.     asf->packet_frag_timestamp = 0;

  1120.     asf->packet_multi_size = 0;

  1121.     asf->packet_obj_size = 0;

  1122.     asf->packet_time_delta = 0;

  1123.     asf->packet_time_start = 0;

  1124. 

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

  1126.         asf_st= s->streams[i]->priv_data;

  1127.         av_free_packet(&asf_st->pkt);

  1128.         asf_st->frag_offset=0;

  1129.         asf_st->seq=0;

  1130.     }

  1131.     asf->asf_st= NULL;

  1132. }

  1133. 

  1134. static int asf_read_close(AVFormatContext *s)

  1135. {

  1136.     asf_reset_header(s);

  1137. 

  1138.     return 0;

  1139. }

  1140. 

  1141. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  1142. {

  1143.     AVPacket pkt1, *pkt = &pkt1;

  1144.     ASFStream *asf_st;

  1145.     int64_t pts;

  1146.     int64_t pos= *ppos;

  1147.     int i;

  1148.     int64_t start_pos[ASF_MAX_STREAMS];

  1149. 

  1150.     for(i=0; i<s->nb_streams; i++){

  1151.         start_pos[i]= pos;

  1152.     }

  1153. 

  1154.     if (s->packet_size > 0)

  1155.         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;

  1156.     *ppos= pos;

  1157.     avio_seek(s->pb, pos, SEEK_SET);

  1158. 

  1159. //printf("asf_read_pts\n");

  1160.     asf_reset_header(s);

  1161.     for(;;){

  1162.         if (asf_read_packet(s, pkt) < 0){

  1163.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1164.             return AV_NOPTS_VALUE;

  1165.         }

  1166. 

  1167.         pts = pkt->dts;

  1168. 

  1169.         av_free_packet(pkt);

  1170.         if(pkt->flags&AV_PKT_FLAG_KEY){

  1171.             i= pkt->stream_index;

  1172. 

  1173.             asf_st= s->streams[i]->priv_data;

  1174. 

  1175. //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);

  1176.             pos= asf_st->packet_pos;

  1177. 

  1178.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1179.             start_pos[i]= asf_st->packet_pos + 1;

  1180. 

  1181.             if(pkt->stream_index == stream_index)

  1182.                break;

  1183.         }

  1184.     }

  1185. 

  1186.     *ppos= pos;

  1187. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1188. 

  1189.     return pts;

  1190. }

  1191. 

  1192. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1193. {

  1194.     ff_asf_guid g;

  1195.     ASFContext *asf = s->priv_data;

  1196.     int64_t current_pos= avio_tell(s->pb);

  1197.     int i;

  1198. 

  1199.     avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);

  1200.     ff_get_guid(s->pb, &g);

  1201. 

  1202.     /* the data object can be followed by other top-level objects,

  1203.        skip them until the simple index object is reached */

  1204.     while (ff_guidcmp(&g, &index_guid)) {

  1205.         int64_t gsize= avio_rl64(s->pb);

  1206.         if (gsize < 24 || s->pb->eof_reached) {

  1207.             avio_seek(s->pb, current_pos, SEEK_SET);

  1208.             return;

  1209.         }

  1210.         avio_skip(s->pb, gsize-24);

  1211.         ff_get_guid(s->pb, &g);

  1212.     }

  1213. 

  1214.     {

  1215.         int64_t itime, last_pos=-1;

  1216.         int pct, ict;

  1217.         int64_t av_unused gsize= avio_rl64(s->pb);

  1218.         ff_get_guid(s->pb, &g);

  1219.         itime=avio_rl64(s->pb);

  1220.         pct=avio_rl32(s->pb);

  1221.         ict=avio_rl32(s->pb);

  1222.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1223. 

  1224.         for (i=0;i<ict;i++){

  1225.             int pktnum=avio_rl32(s->pb);

  1226.             int pktct =avio_rl16(s->pb);

  1227.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1228.             int64_t index_pts= FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);

  1229. 

  1230.             if(pos != last_pos){

  1231.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d  pts: %"PRId64"\n", pktnum, pktct, index_pts);

  1232.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1233.             last_pos=pos;

  1234.             }

  1235.         }

  1236.         asf->index_read= 1;

  1237.     }

  1238.     avio_seek(s->pb, current_pos, SEEK_SET);

  1239. }

  1240. 

  1241. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1242. {

  1243.     ASFContext *asf = s->priv_data;

  1244.     AVStream *st = s->streams[stream_index];

  1245.     int64_t pos;

  1246.     int index;

  1247. 

  1248.     if (s->packet_size <= 0)

  1249.         return -1;

  1250. 

  1251.     /* Try using the protocol's read_seek if available */

  1252.     if(s->pb) {

  1253.         int ret = avio_seek_time(s->pb, stream_index, pts, flags);

  1254.         if(ret >= 0)

  1255.             asf_reset_header(s);

  1256.         if (ret != AVERROR(ENOSYS))

  1257.             return ret;

  1258.     }

  1259. 

  1260.     if (!asf->index_read)

  1261.         asf_build_simple_index(s, stream_index);

  1262. 

  1263.     if((asf->index_read && st->index_entries)){

  1264.         index= av_index_search_timestamp(st, pts, flags);

  1265.         if(index >= 0) {

  1266.             /* find the position */

  1267.             pos = st->index_entries[index].pos;

  1268. 

  1269.             /* do the seek */

  1270.             av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1271.             avio_seek(s->pb, pos, SEEK_SET);

  1272.             asf_reset_header(s);

  1273.             return 0;

  1274.         }

  1275.     }

  1276.     /* no index or seeking by index failed */

  1277.     if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)

  1278.         return -1;

  1279.     asf_reset_header(s);

  1280.     return 0;

  1281. }

  1282. 

  1283. AVInputFormat ff_asf_demuxer = {

  1284.     .name           = "asf",

  1285.     .long_name      = NULL_IF_CONFIG_SMALL("ASF format"),

  1286.     .priv_data_size = sizeof(ASFContext),

  1287.     .read_probe     = asf_probe,

  1288.     .read_header    = asf_read_header,

  1289.     .read_packet    = asf_read_packet,

  1290.     .read_close     = asf_read_close,

  1291.     .read_seek      = asf_read_seek,

  1292.     .read_timestamp = asf_read_pts,

  1293.     .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,

  1294. };