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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/common.h"

  25. #include "libavutil/avstring.h"

  26. #include "libavcodec/mpegaudio.h"

  27. #include "avformat.h"

  28. #include "avio_internal.h"

  29. #include "riff.h"

  30. #include "asf.h"

  31. #include "asfcrypt.h"

  32. #include "avlanguage.h"

  33. 

  34. typedef struct {

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

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

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

  38.     AVRational dar[128];

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

  40.     /* non streamed additonnal info */

  41.     /* packet filling */

  42.     int packet_size_left;

  43.     /* only for reading */

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

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

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

  47.     int index_read;

  48. 

  49.     ASFMainHeader hdr;

  50. 

  51.     int packet_flags;

  52.     int packet_property;

  53.     int packet_timestamp;

  54.     int packet_segsizetype;

  55.     int packet_segments;

  56.     int packet_seq;

  57.     int packet_replic_size;

  58.     int packet_key_frame;

  59.     int packet_padsize;

  60.     unsigned int packet_frag_offset;

  61.     unsigned int packet_frag_size;

  62.     int64_t packet_frag_timestamp;

  63.     int packet_multi_size;

  64.     int packet_obj_size;

  65.     int packet_time_delta;

  66.     int packet_time_start;

  67.     int64_t packet_pos;

  68. 

  69.     int stream_index;

  70. 

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

  72. } ASFContext;

  73. 

  74. #undef NDEBUG

  75. #include <assert.h>

  76. 

  77. #define ASF_MAX_STREAMS 127

  78. #define FRAME_HEADER_SIZE 17

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

  80. 

  81. static const ff_asf_guid index_guid = {

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

  83. };

  84. 

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

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

  87. };

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

  89. /* decoding */

  90. 

  91. #ifdef DEBUG

  92. #define PRINT_IF_GUID(g,cmp) \

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

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

  95. 

  96. static void print_guid(const ff_asf_guid *g)

  97. {

  98.     int i;

  99.     PRINT_IF_GUID(g, ff_asf_header);

  100.     else PRINT_IF_GUID(g, ff_asf_file_header);

  101.     else PRINT_IF_GUID(g, ff_asf_stream_header);

  102.     else PRINT_IF_GUID(g, ff_asf_audio_stream);

  103.     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);

  104.     else PRINT_IF_GUID(g, ff_asf_video_stream);

  105.     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);

  106.     else PRINT_IF_GUID(g, ff_asf_command_stream);

  107.     else PRINT_IF_GUID(g, ff_asf_comment_header);

  108.     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);

  109.     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);

  110.     else PRINT_IF_GUID(g, ff_asf_data_header);

  111.     else PRINT_IF_GUID(g, index_guid);

  112.     else PRINT_IF_GUID(g, ff_asf_head1_guid);

  113.     else PRINT_IF_GUID(g, ff_asf_head2_guid);

  114.     else PRINT_IF_GUID(g, ff_asf_my_guid);

  115.     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);

  116.     else PRINT_IF_GUID(g, ff_asf_extended_content_header);

  117.     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);

  118.     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);

  119.     else PRINT_IF_GUID(g, ff_asf_metadata_header);

  120.     else PRINT_IF_GUID(g, ff_asf_marker_header);

  121.     else PRINT_IF_GUID(g, stream_bitrate_guid);

  122.     else PRINT_IF_GUID(g, ff_asf_language_guid);

  123.     else

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

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

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

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

  128. }

  129. #undef PRINT_IF_GUID

  130. #else

  131. #define print_guid(g)

  132. #endif

  133. 

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

  135. {

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

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

  138. }

  139. 

  140. static int asf_probe(AVProbeData *pd)

  141. {

  142.     /* check file header */

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

  144.         return AVPROBE_SCORE_MAX;

  145.     else

  146.         return 0;

  147. }

  148. 

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

  150.     switch(type){

  151.         case 2: return avio_rl32(pb);

  152.         case 3: return avio_rl32(pb);

  153.         case 4: return avio_rl64(pb);

  154.         case 5: return avio_rl16(pb);

  155.         default:return INT_MIN;

  156.     }

  157. }

  158. 

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

  160. {

  161.     char *value;

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

  163. 

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

  165.         return;

  166. 

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

  168.     if (!value)

  169.         goto finish;

  170. 

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

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

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

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

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

  176.     } else {

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

  178.         goto finish;

  179.     }

  180.     if (*value)

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

  182. finish:

  183.     av_freep(&value);

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

  185. }

  186. 

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

  188. {

  189.     ASFContext *asf = s->priv_data;

  190.     AVIOContext *pb = s->pb;

  191. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  205. 

  206.     return 0;

  207. }

  208. 

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

  210. {

  211.     ASFContext *asf = s->priv_data;

  212.     AVIOContext *pb = s->pb;

  213.     AVStream *st;

  214.     ASFStream *asf_st;

  215.     ff_asf_guid g;

  216.     enum AVMediaType type;

  217.     int type_specific_size, sizeX;

  218.     uint64_t total_size;

  219.     unsigned int tag1;

  220.     int64_t pos1, pos2, start_time;

  221.     int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  222. 

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

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

  225.         return AVERROR(EINVAL);

  226.     }

  227. 

  228.     pos1 = avio_tell(pb);

  229. 

  230.     st = av_new_stream(s, 0);

  231.     if (!st)

  232.         return AVERROR(ENOMEM);

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

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

  235.     if (!asf_st)

  236.         return AVERROR(ENOMEM);

  237.     st->priv_data = asf_st;

  238.     st->start_time = 0;

  239.     start_time = asf->hdr.preroll;

  240. 

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

  242. 

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

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

  245.             (10000000 / 1000) - start_time;

  246.     }

  247.     ff_get_guid(pb, &g);

  248. 

  249.     test_for_ext_stream_audio = 0;

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

  251.         type = AVMEDIA_TYPE_AUDIO;

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

  253.         type = AVMEDIA_TYPE_VIDEO;

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

  255.         type = AVMEDIA_TYPE_VIDEO;

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

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

  258.         type = AVMEDIA_TYPE_DATA;

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

  260.         test_for_ext_stream_audio = 1;

  261.         type = AVMEDIA_TYPE_UNKNOWN;

  262.     } else {

  263.         return -1;

  264.     }

  265.     ff_get_guid(pb, &g);

  266.     total_size = avio_rl64(pb);

  267.     type_specific_size = avio_rl32(pb);

  268.     avio_rl32(pb);

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

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

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

  272. 

  273.     avio_rl32(pb);

  274. 

  275.     if (test_for_ext_stream_audio) {

  276.         ff_get_guid(pb, &g);

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

  278.             type = AVMEDIA_TYPE_AUDIO;

  279.             is_dvr_ms_audio=1;

  280.             ff_get_guid(pb, &g);

  281.             avio_rl32(pb);

  282.             avio_rl32(pb);

  283.             avio_rl32(pb);

  284.             ff_get_guid(pb, &g);

  285.             avio_rl32(pb);

  286.         }

  287.     }

  288. 

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

  290.     if (type == AVMEDIA_TYPE_AUDIO) {

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

  292.         if (ret < 0)

  293.             return ret;

  294.         if (is_dvr_ms_audio) {

  295.             // codec_id and codec_tag are unreliable in dvr_ms

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

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

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

  299.         }

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

  301.             st->need_parsing = AVSTREAM_PARSE_NONE;

  302.         } else {

  303.             st->need_parsing = AVSTREAM_PARSE_FULL;

  304.         }

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

  306.         pos2 = avio_tell(pb);

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

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

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

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

  311.             avio_rl16(pb); //ds_data_size

  312.             avio_r8(pb);   //ds_silence_data

  313.         }

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

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

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

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

  318.             if (!asf_st->ds_chunk_size

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

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

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

  322.         }

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

  324.             case CODEC_ID_MP3:

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

  326.                 break;

  327.             case CODEC_ID_PCM_S16LE:

  328.             case CODEC_ID_PCM_S16BE:

  329.             case CODEC_ID_PCM_U16LE:

  330.             case CODEC_ID_PCM_U16BE:

  331.             case CODEC_ID_PCM_S8:

  332.             case CODEC_ID_PCM_U8:

  333.             case CODEC_ID_PCM_ALAW:

  334.             case CODEC_ID_PCM_MULAW:

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

  336.                 break;

  337.             default:

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

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

  340.                 break;

  341.         }

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

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

  344.         avio_rl32(pb);

  345.         avio_rl32(pb);

  346.         avio_r8(pb);

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

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

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

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

  351.         /* not available for asf */

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

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

  354.         tag1 = avio_rl32(pb);

  355.         avio_skip(pb, 20);

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

  357.         if (sizeX > 40) {

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

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

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

  361.         }

  362. 

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

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

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

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

  367.             int av_unused i;

  368. #if HAVE_BIGENDIAN

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

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

  371. #else

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

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

  374. #endif

  375.             asf_st->palette_changed = 1;

  376.         }

  377. 

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

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

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

  381.             st->need_parsing = AVSTREAM_PARSE_FULL;

  382.             // 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

  383.             st->codec->width  =

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

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

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

  387.         }

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

  389.             st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;

  390.     }

  391.     pos2 = avio_tell(pb);

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

  393. 

  394.     return 0;

  395. }

  396. 

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

  398. {

  399.     ASFContext *asf = s->priv_data;

  400.     AVIOContext *pb = s->pb;

  401.     ff_asf_guid g;

  402.     int ext_len, payload_ext_ct, stream_ct, i;

  403.     uint32_t ext_d, leak_rate, stream_num;

  404.     unsigned int stream_languageid_index;

  405. 

  406.     avio_rl64(pb); // starttime

  407.     avio_rl64(pb); // endtime

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

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

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

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

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

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

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

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

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

  417. 

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

  419.     if (stream_num < 128)

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

  421. 

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

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

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

  425. 

  426.     if (stream_num < 128)

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

  428. 

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

  430.         avio_rl16(pb);

  431.         ext_len = avio_rl16(pb);

  432.         avio_skip(pb, ext_len);

  433.     }

  434. 

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

  436.         ff_get_guid(pb, &g);

  437.         ext_d=avio_rl16(pb);

  438.         ext_len=avio_rl32(pb);

  439.         avio_skip(pb, ext_len);

  440.     }

  441. 

  442.     return 0;

  443. }

  444. 

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

  446. {

  447.     AVIOContext *pb = s->pb;

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

  449. 

  450.     len1 = avio_rl16(pb);

  451.     len2 = avio_rl16(pb);

  452.     len3 = avio_rl16(pb);

  453.     len4 = avio_rl16(pb);

  454.     len5 = avio_rl16(pb);

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

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

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

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

  459.     avio_skip(pb, len5);

  460. 

  461.     return 0;

  462. }

  463. 

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

  465. {

  466.     AVIOContext *pb = s->pb;

  467.     ASFContext *asf = s->priv_data;

  468.     int desc_count, i, ret;

  469. 

  470.     desc_count = avio_rl16(pb);

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

  472.         int name_len,value_type,value_len;

  473.         char name[1024];

  474. 

  475.         name_len = avio_rl16(pb);

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

  477.             name_len += 1;

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

  479.             avio_skip(pb, name_len - ret);

  480.         value_type = avio_rl16(pb);

  481.         value_len  = avio_rl16(pb);

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

  483.             value_len += 1;

  484.         /**

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

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

  487.          */

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

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

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

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

  492.         } else

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

  494.     }

  495. 

  496.     return 0;

  497. }

  498. 

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

  500. {

  501.     AVIOContext *pb = s->pb;

  502.     ASFContext *asf = s->priv_data;

  503.     int j, ret;

  504.     int stream_count = avio_rl16(pb);

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

  506.         char lang[6];

  507.         unsigned int lang_len = avio_r8(pb);

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

  509.             avio_skip(pb, lang_len - ret);

  510.         if (j < 128)

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

  512.     }

  513. 

  514.     return 0;

  515. }

  516. 

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

  518. {

  519.     AVIOContext *pb = s->pb;

  520.     ASFContext *asf = s->priv_data;

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

  522.     int ret, i;

  523.     n = avio_rl16(pb);

  524. 

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

  526.         char name[1024];

  527. 

  528.         avio_rl16(pb); //lang_list_index

  529.         stream_num= avio_rl16(pb);

  530.         name_len=   avio_rl16(pb);

  531.         value_type= avio_rl16(pb);

  532.         value_len=  avio_rl32(pb);

  533. 

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

  535.             avio_skip(pb, name_len - ret);

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

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

  538.         avio_skip(pb, value_len - 2);

  539. 

  540.         if(stream_num<128){

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

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

  543.         }

  544.     }

  545. 

  546.     return 0;

  547. }

  548. 

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

  550. {

  551.     AVIOContext *pb = s->pb;

  552.     int i, count, name_len, ret;

  553.     char name[1024];

  554. 

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

  556.     avio_rl64(pb);            // ...

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

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

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

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

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

  562.     }

  563. 

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

  565.         int64_t pres_time;

  566.         int name_len;

  567. 

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

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

  570.         avio_rl16(pb);             // entry length

  571.         avio_rl32(pb);             // send time

  572.         avio_rl32(pb);             // flags

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

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

  575.             avio_skip(pb, name_len - ret);

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

  577.     }

  578. 

  579.     return 0;

  580. }

  581. 

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

  583. {

  584.     ASFContext *asf = s->priv_data;

  585.     ff_asf_guid g;

  586.     AVIOContext *pb = s->pb;

  587.     int i;

  588.     int64_t gsize;

  589. 

  590.     ff_get_guid(pb, &g);

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

  592.         return -1;

  593.     avio_rl64(pb);

  594.     avio_rl32(pb);

  595.     avio_r8(pb);

  596.     avio_r8(pb);

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

  598.     for(;;) {

  599.         uint64_t gpos= avio_tell(pb);

  600.         ff_get_guid(pb, &g);

  601.         gsize = avio_rl64(pb);

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

  603.         print_guid(&g);

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

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

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

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

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

  609.                 asf->data_object_size = gsize - 24;

  610.             } else {

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

  612.             }

  613.             break;

  614.         }

  615.         if (gsize < 24)

  616.             return -1;

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

  618.             asf_read_file_properties(s, gsize);

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

  620.             asf_read_stream_properties(s, gsize);

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

  622.             asf_read_content_desc(s, gsize);

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

  624.             asf_read_language_list(s, gsize);

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

  626.             asf_read_ext_content_desc(s, gsize);

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

  628.             asf_read_metadata(s, gsize);

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

  630.             asf_read_ext_stream_properties(s, gsize);

  631. 

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

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

  634.             continue;

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

  636.             int v1, v2;

  637.             ff_get_guid(pb, &g);

  638.             v1 = avio_rl32(pb);

  639.             v2 = avio_rl16(pb);

  640.             continue;

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

  642.             asf_read_marker(s, gsize);

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

  644.             return -1;

  645.         } else {

  646.             if (!s->keylen) {

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

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

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

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

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

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

  653.                 }

  654.             }

  655.         }

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

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

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

  659.     }

  660.     ff_get_guid(pb, &g);

  661.     avio_rl64(pb);

  662.     avio_r8(pb);

  663.     avio_r8(pb);

  664.     if (pb->eof_reached)

  665.         return -1;

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

  667.     asf->packet_size_left = 0;

  668. 

  669. 

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

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

  672.         if(stream_num>=0){

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

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

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

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

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

  678.                           &st->sample_aspect_ratio.den,

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

  680.             } 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.

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

  682.                           &st->sample_aspect_ratio.den,

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

  684. 

  685. //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);

  686. 

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

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

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

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

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

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

  693.                     if (iso6392)

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

  695.                 }

  696.             }

  697.         }

  698.     }

  699. 

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

  701. 

  702.     return 0;

  703. }

  704. 

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

  706.     switch (bits & 3) \

  707.     { \

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

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

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

  711.     default: var = defval; break; \

  712.     }

  713. 

  714. /**

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

  716.  * @param s demux context

  717.  * @param pb context to read data from

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

  719.  */

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

  721. {

  722.     ASFContext *asf = s->priv_data;

  723.     uint32_t packet_length, padsize;

  724.     int rsize = 8;

  725.     int c, d, e, off;

  726. 

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

  728.     off= 32768;

  729.     if (s->packet_size > 0)

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

  731. 

  732.     c=d=e=-1;

  733.     while(off-- > 0){

  734.         c=d; d=e;

  735.         e= avio_r8(pb);

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

  737.             break;

  738.     }

  739. 

  740.     if (c != 0x82) {

  741.         /**

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

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

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

  745.          * the stream.

  746.          */

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

  748.             return AVERROR(EAGAIN);

  749.         if (!pb->eof_reached)

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

  751.     }

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

  753.         if (d || e) {

  754.             if (!pb->eof_reached)

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

  756.             return -1;

  757.         }

  758.         c= avio_r8(pb);

  759.         d= avio_r8(pb);

  760.         rsize+=3;

  761.     }else{

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

  763.     }

  764. 

  765.     asf->packet_flags    = c;

  766.     asf->packet_property = d;

  767. 

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

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

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

  771. 

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

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

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

  775.         return -1;

  776.     }

  777.     if(padsize >= packet_length){

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

  779.         return -1;

  780.     }

  781. 

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

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

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

  785. 

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

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

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

  789.     } else {

  790.         asf->packet_segments = 1;

  791.         asf->packet_segsizetype = 0x80;

  792.     }

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

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

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

  796.     asf->packet_padsize = padsize;

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

  798.     return 0;

  799. }

  800. 

  801. /**

  802.  *

  803.  * @return <0 if error

  804.  */

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

  806.     ASFContext *asf = s->priv_data;

  807.     int rsize = 1;

  808.     int num = avio_r8(pb);

  809.     int64_t ts0, ts1;

  810. 

  811.     asf->packet_segments--;

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

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

  814.     // sequence should be ignored!

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

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

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

  818. //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);

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

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

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

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

  823.             return -1;

  824.         }

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

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

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

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

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

  830.             avio_skip(pb, 10);

  831.             ts0= avio_rl64(pb);

  832.             ts1= avio_rl64(pb);

  833.             avio_skip(pb, 12);

  834.             avio_rl32(pb);

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

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

  837.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  838.         }else

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

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

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

  842.         // multipacket - frag_offset is beginning timestamp

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

  844.         asf->packet_frag_offset = 0;

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

  846. 

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

  848.         rsize++;

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

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

  851.         return -1;

  852.     }

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

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

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

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

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

  858.                 return -1;

  859.             } else {

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

  861.                 asf->packet_size_left += diff;

  862.                 asf->packet_padsize   -= diff;

  863.             }

  864.         }

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

  866.     } else {

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

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

  869.             return -1;

  870.         }

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

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

  873.     }

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

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

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

  877.             return -1;

  878.     }

  879.     asf->packet_size_left -= rsize;

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

  881. 

  882.     return 0;

  883. }

  884. 

  885. /**

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

  887.  * with asf_get_packet()).

  888.  * @param s demux context

  889.  * @param pb context to read data from

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

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

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

  893.  */

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

  895. {

  896.     ASFContext *asf = s->priv_data;

  897.     ASFStream *asf_st = 0;

  898.     for (;;) {

  899.         int ret;

  900.         if(pb->eof_reached)

  901.             return AVERROR_EOF;

  902.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  907.             assert(ret>=0);

  908.             /* fail safe */

  909.             avio_skip(pb, ret);

  910. 

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

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

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

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

  915.             return 1;

  916.         }

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

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

  919.                 asf->packet_segments= 0;

  920.                 continue;

  921.             }

  922.             if (asf->stream_index < 0

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

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

  925.                 ) {

  926.                 asf->packet_time_start = 0;

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

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

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

  930.                 if(asf->stream_index < 0)

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

  932.                 continue;

  933.             }

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

  935.         }

  936.         asf_st = asf->asf_st;

  937. 

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

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

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

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

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

  943.             asf->packet_size_left--;

  944.             asf->packet_multi_size--;

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

  946.             {

  947.                 asf->packet_time_start = 0;

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

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

  950.                 continue;

  951.             }

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

  953.             //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);

  954.         }

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

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

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

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

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

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

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

  962.         }

  963. 

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

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

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

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

  968.                 asf_st->frag_offset = 0;

  969.                 av_free_packet(&asf_st->pkt);

  970.             }

  971.             /* new packet */

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

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

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

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

  976.             asf_st->pkt.pos =

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

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

  979.                 uint8_t *pal;

  980.                 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE,

  981.                                               AVPALETTE_SIZE);

  982.                 if (!pal) {

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

  984.                 } else {

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

  986.                     asf_st->palette_changed = 0;

  987.                 }

  988.             }

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

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

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

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

  993.                 asf->packet_key_frame = 1;

  994.             if (asf->packet_key_frame)

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

  996.         }

  997. 

  998.         /* read data */

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

  1000.         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,

  1001.         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);

  1002.         asf->packet_size_left -= asf->packet_frag_size;

  1003.         if (asf->packet_size_left < 0)

  1004.             continue;

  1005. 

  1006.         if(   asf->packet_frag_offset >= asf_st->pkt.size

  1007.            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){

  1008.             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",

  1009.                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);

  1010.             continue;

  1011.         }

  1012. 

  1013.         ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,

  1014.                          asf->packet_frag_size);

  1015.         if (ret != asf->packet_frag_size) {

  1016.             if (ret < 0 || asf->packet_frag_offset + ret == 0)

  1017.                 return ret < 0 ? ret : AVERROR_EOF;

  1018.             if (asf_st->ds_span > 1) {

  1019.                 // scrambling, we can either drop it completely or fill the remainder

  1020.                 // TODO: should we fill the whole packet instead of just the current

  1021.                 // fragment?

  1022.                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,

  1023.                        asf->packet_frag_size - ret);

  1024.                 ret = asf->packet_frag_size;

  1025.             } else

  1026.                 // no scrambling, so we can return partial packets

  1027.                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);

  1028.         }

  1029.         if (s->key && s->keylen == 20)

  1030.             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,

  1031.                             ret);

  1032.         asf_st->frag_offset += ret;

  1033.         /* test if whole packet is read */

  1034.         if (asf_st->frag_offset == asf_st->pkt.size) {

  1035.             //workaround for macroshit radio DVR-MS files

  1036.             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO

  1037.                && asf_st->pkt.size > 100){

  1038.                 int i;

  1039.                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);

  1040.                 if(i == asf_st->pkt.size){

  1041.                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");

  1042.                     asf_st->frag_offset = 0;

  1043.                     av_free_packet(&asf_st->pkt);

  1044.                     continue;

  1045.                 }

  1046.             }

  1047. 

  1048.             /* return packet */

  1049.             if (asf_st->ds_span > 1) {

  1050.               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){

  1051.                     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);

  1052.               }else{

  1053.                 /* packet descrambling */

  1054.                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);

  1055.                 if (newdata) {

  1056.                     int offset = 0;

  1057.                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

  1058.                     while (offset < asf_st->pkt.size) {

  1059.                         int off = offset / asf_st->ds_chunk_size;

  1060.                         int row = off / asf_st->ds_span;

  1061.                         int col = off % asf_st->ds_span;

  1062.                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;

  1063.                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);

  1064. 

  1065.                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);

  1066.                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);

  1067.                         memcpy(newdata + offset,

  1068.                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,

  1069.                                asf_st->ds_chunk_size);

  1070.                         offset += asf_st->ds_chunk_size;

  1071.                     }

  1072.                     av_free(asf_st->pkt.data);

  1073.                     asf_st->pkt.data = newdata;

  1074.                 }

  1075.               }

  1076.             }

  1077.             asf_st->frag_offset = 0;

  1078.             *pkt= asf_st->pkt;

  1079.             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);

  1080.             asf_st->pkt.size = 0;

  1081.             asf_st->pkt.data = 0;

  1082.             break; // packet completed

  1083.         }

  1084.     }

  1085.     return 0;

  1086. }

  1087. 

  1088. static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)

  1089. {

  1090.     ASFContext *asf = s->priv_data;

  1091. 

  1092.     for (;;) {

  1093.         int ret;

  1094. 

  1095.         /* parse cached packets, if any */

  1096.         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)

  1097.             return ret;

  1098.         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)

  1099.             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);

  1100.         asf->packet_time_start = 0;

  1101.     }

  1102. 

  1103.     return 0;

  1104. }

  1105. 

  1106. // Added to support seeking after packets have been read

  1107. // If information is not reset, read_packet fails due to

  1108. // leftover information from previous reads

  1109. static void asf_reset_header(AVFormatContext *s)

  1110. {

  1111.     ASFContext *asf = s->priv_data;

  1112.     ASFStream *asf_st;

  1113.     int i;

  1114. 

  1115.     asf->packet_size_left = 0;

  1116.     asf->packet_segments = 0;

  1117.     asf->packet_flags = 0;

  1118.     asf->packet_property = 0;

  1119.     asf->packet_timestamp = 0;

  1120.     asf->packet_segsizetype = 0;

  1121.     asf->packet_segments = 0;

  1122.     asf->packet_seq = 0;

  1123.     asf->packet_replic_size = 0;

  1124.     asf->packet_key_frame = 0;

  1125.     asf->packet_padsize = 0;

  1126.     asf->packet_frag_offset = 0;

  1127.     asf->packet_frag_size = 0;

  1128.     asf->packet_frag_timestamp = 0;

  1129.     asf->packet_multi_size = 0;

  1130.     asf->packet_obj_size = 0;

  1131.     asf->packet_time_delta = 0;

  1132.     asf->packet_time_start = 0;

  1133. 

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

  1135.         asf_st= s->streams[i]->priv_data;

  1136.         av_free_packet(&asf_st->pkt);

  1137.         asf_st->frag_offset=0;

  1138.         asf_st->seq=0;

  1139.     }

  1140.     asf->asf_st= NULL;

  1141. }

  1142. 

  1143. static int asf_read_close(AVFormatContext *s)

  1144. {

  1145.     asf_reset_header(s);

  1146. 

  1147.     return 0;

  1148. }

  1149. 

  1150. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  1151. {

  1152.     AVPacket pkt1, *pkt = &pkt1;

  1153.     ASFStream *asf_st;

  1154.     int64_t pts;

  1155.     int64_t pos= *ppos;

  1156.     int i;

  1157.     int64_t start_pos[ASF_MAX_STREAMS];

  1158. 

  1159.     for(i=0; i<s->nb_streams; i++){

  1160.         start_pos[i]= pos;

  1161.     }

  1162. 

  1163.     if (s->packet_size > 0)

  1164.         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;

  1165.     *ppos= pos;

  1166.     avio_seek(s->pb, pos, SEEK_SET);

  1167. 

  1168. //printf("asf_read_pts\n");

  1169.     asf_reset_header(s);

  1170.     for(;;){

  1171.         if (av_read_frame(s, pkt) < 0){

  1172.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1173.             return AV_NOPTS_VALUE;

  1174.         }

  1175. 

  1176.         pts= pkt->pts;

  1177. 

  1178.         av_free_packet(pkt);

  1179.         if(pkt->flags&AV_PKT_FLAG_KEY){

  1180.             i= pkt->stream_index;

  1181. 

  1182.             asf_st= s->streams[i]->priv_data;

  1183. 

  1184. //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);

  1185.             pos= asf_st->packet_pos;

  1186. 

  1187.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1188.             start_pos[i]= asf_st->packet_pos + 1;

  1189. 

  1190.             if(pkt->stream_index == stream_index)

  1191.                break;

  1192.         }

  1193.     }

  1194. 

  1195.     *ppos= pos;

  1196. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1197. 

  1198.     return pts;

  1199. }

  1200. 

  1201. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1202. {

  1203.     ff_asf_guid g;

  1204.     ASFContext *asf = s->priv_data;

  1205.     int64_t current_pos= avio_tell(s->pb);

  1206.     int i;

  1207. 

  1208.     avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);

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

  1210. 

  1211.     /* the data object can be followed by other top-level objects,

  1212.        skip them until the simple index object is reached */

  1213.     while (ff_guidcmp(&g, &index_guid)) {

  1214.         int64_t gsize= avio_rl64(s->pb);

  1215.         if (gsize < 24 || s->pb->eof_reached) {

  1216.             avio_seek(s->pb, current_pos, SEEK_SET);

  1217.             return;

  1218.         }

  1219.         avio_skip(s->pb, gsize-24);

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

  1221.     }

  1222. 

  1223.     {

  1224.         int64_t itime, last_pos=-1;

  1225.         int pct, ict;

  1226.         int64_t av_unused gsize= avio_rl64(s->pb);

  1227.         ff_get_guid(s->pb, &g);

  1228.         itime=avio_rl64(s->pb);

  1229.         pct=avio_rl32(s->pb);

  1230.         ict=avio_rl32(s->pb);

  1231.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1232. 

  1233.         for (i=0;i<ict;i++){

  1234.             int pktnum=avio_rl32(s->pb);

  1235.             int pktct =avio_rl16(s->pb);

  1236.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1237.             int64_t index_pts= FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);

  1238. 

  1239.             if(pos != last_pos){

  1240.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d  pts: %"PRId64"\n", pktnum, pktct, index_pts);

  1241.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1242.             last_pos=pos;

  1243.             }

  1244.         }

  1245.         asf->index_read= 1;

  1246.     }

  1247.     avio_seek(s->pb, current_pos, SEEK_SET);

  1248. }

  1249. 

  1250. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1251. {

  1252.     ASFContext *asf = s->priv_data;

  1253.     AVStream *st = s->streams[stream_index];

  1254.     int64_t pos;

  1255.     int index;

  1256. 

  1257.     if (s->packet_size <= 0)

  1258.         return -1;

  1259. 

  1260.     /* Try using the protocol's read_seek if available */

  1261.     if(s->pb) {

  1262.         int ret = avio_seek_time(s->pb, stream_index, pts, flags);

  1263.         if(ret >= 0)

  1264.             asf_reset_header(s);

  1265.         if (ret != AVERROR(ENOSYS))

  1266.             return ret;

  1267.     }

  1268. 

  1269.     if (!asf->index_read)

  1270.         asf_build_simple_index(s, stream_index);

  1271. 

  1272.     if(!(asf->index_read && st->index_entries)){

  1273.         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)

  1274.             return -1;

  1275.     }else{

  1276.         index= av_index_search_timestamp(st, pts, flags);

  1277.         if(index<0)

  1278.             return -1;

  1279. 

  1280.         /* find the position */

  1281.         pos = st->index_entries[index].pos;

  1282. 

  1283.         /* do the seek */

  1284.         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1285.         avio_seek(s->pb, pos, SEEK_SET);

  1286.     }

  1287.     asf_reset_header(s);

  1288.     return 0;

  1289. }

  1290. 

  1291. AVInputFormat ff_asf_demuxer = {

  1292.     "asf",

  1293.     NULL_IF_CONFIG_SMALL("ASF format"),

  1294.     sizeof(ASFContext),

  1295.     asf_probe,

  1296.     asf_read_header,

  1297.     asf_read_packet,

  1298.     asf_read_close,

  1299.     asf_read_seek,

  1300.     asf_read_pts,

  1301. };