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FFmpeg/libavformat/asfdec.c

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  1. /*

  2.  * ASF compatible demuxer

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

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. //#define DEBUG

  23. 

  24. #include "libavutil/bswap.h"

  25. #include "libavutil/common.h"

  26. #include "libavutil/avstring.h"

  27. #include "libavcodec/mpegaudio.h"

  28. #include "avformat.h"

  29. #include "avio_internal.h"

  30. #include "riff.h"

  31. #include "asf.h"

  32. #include "asfcrypt.h"

  33. #include "avlanguage.h"

  34. 

  35. typedef struct {

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

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

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

  39.     AVRational dar[128];

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

  41.     /* non streamed additonnal info */

  42.     /* packet filling */

  43.     int packet_size_left;

  44.     /* only for reading */

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

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

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

  48.     int index_read;

  49. 

  50.     ASFMainHeader hdr;

  51. 

  52.     int packet_flags;

  53.     int packet_property;

  54.     int packet_timestamp;

  55.     int packet_segsizetype;

  56.     int packet_segments;

  57.     int packet_seq;

  58.     int packet_replic_size;

  59.     int packet_key_frame;

  60.     int packet_padsize;

  61.     unsigned int packet_frag_offset;

  62.     unsigned int packet_frag_size;

  63.     int64_t packet_frag_timestamp;

  64.     int packet_multi_size;

  65.     int packet_obj_size;

  66.     int packet_time_delta;

  67.     int packet_time_start;

  68.     int64_t packet_pos;

  69. 

  70.     int stream_index;

  71. 

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

  73. } ASFContext;

  74. 

  75. #undef NDEBUG

  76. #include <assert.h>

  77. 

  78. #define ASF_MAX_STREAMS 127

  79. #define FRAME_HEADER_SIZE 17

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

  81. 

  82. static const ff_asf_guid index_guid = {

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

  84. };

  85. 

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

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

  88. };

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

  90. /* decoding */

  91. 

  92. #ifdef DEBUG

  93. #define PRINT_IF_GUID(g,cmp) \

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

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

  96. 

  97. static void print_guid(const ff_asf_guid *g)

  98. {

  99.     int i;

  100.     PRINT_IF_GUID(g, ff_asf_header);

  101.     else PRINT_IF_GUID(g, ff_asf_file_header);

  102.     else PRINT_IF_GUID(g, ff_asf_stream_header);

  103.     else PRINT_IF_GUID(g, ff_asf_audio_stream);

  104.     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);

  105.     else PRINT_IF_GUID(g, ff_asf_video_stream);

  106.     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);

  107.     else PRINT_IF_GUID(g, ff_asf_command_stream);

  108.     else PRINT_IF_GUID(g, ff_asf_comment_header);

  109.     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);

  110.     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);

  111.     else PRINT_IF_GUID(g, ff_asf_data_header);

  112.     else PRINT_IF_GUID(g, index_guid);

  113.     else PRINT_IF_GUID(g, ff_asf_head1_guid);

  114.     else PRINT_IF_GUID(g, ff_asf_head2_guid);

  115.     else PRINT_IF_GUID(g, ff_asf_my_guid);

  116.     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);

  117.     else PRINT_IF_GUID(g, ff_asf_extended_content_header);

  118.     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);

  119.     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);

  120.     else PRINT_IF_GUID(g, ff_asf_metadata_header);

  121.     else PRINT_IF_GUID(g, ff_asf_marker_header);

  122.     else PRINT_IF_GUID(g, stream_bitrate_guid);

  123.     else PRINT_IF_GUID(g, ff_asf_language_guid);

  124.     else

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

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

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

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

  129. }

  130. #undef PRINT_IF_GUID

  131. #else

  132. #define print_guid(g)

  133. #endif

  134. 

  135. static int asf_probe(AVProbeData *pd)

  136. {

  137.     /* check file header */

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

  139.         return AVPROBE_SCORE_MAX;

  140.     else

  141.         return 0;

  142. }

  143. 

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

  145.     switch(type){

  146.         case 2: return avio_rl32(pb);

  147.         case 3: return avio_rl32(pb);

  148.         case 4: return avio_rl64(pb);

  149.         case 5: return avio_rl16(pb);

  150.         default:return INT_MIN;

  151.     }

  152. }

  153. 

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

  155. {

  156.     char *value;

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

  158. 

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

  160.         return;

  161. 

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

  163.     if (!value)

  164.         goto finish;

  165. 

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

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

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

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

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

  171.     } else {

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

  173.         goto finish;

  174.     }

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

  176. finish:

  177.     av_freep(&value);

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

  179. }

  180. 

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

  182. {

  183.     ASFContext *asf = s->priv_data;

  184.     AVIOContext *pb = s->pb;

  185. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  199. 

  200.     return 0;

  201. }

  202. 

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

  204. {

  205.     ASFContext *asf = s->priv_data;

  206.     AVIOContext *pb = s->pb;

  207.     AVStream *st;

  208.     ASFStream *asf_st;

  209.     ff_asf_guid g;

  210.     enum AVMediaType type;

  211.     int type_specific_size, sizeX;

  212.     uint64_t total_size av_unused;

  213.     unsigned int tag1;

  214.     int64_t pos1, pos2, start_time;

  215.     int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  216. 

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

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

  219.         return AVERROR(EINVAL);

  220.     }

  221. 

  222.     pos1 = avio_tell(pb);

  223. 

  224.     st = av_new_stream(s, 0);

  225.     if (!st)

  226.         return AVERROR(ENOMEM);

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

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

  229.     if (!asf_st)

  230.         return AVERROR(ENOMEM);

  231.     st->priv_data = asf_st;

  232.     start_time = asf->hdr.preroll;

  233. 

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

  235. 

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

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

  238.             (10000000 / 1000) - start_time;

  239.     }

  240.     ff_get_guid(pb, &g);

  241. 

  242.     test_for_ext_stream_audio = 0;

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

  244.         type = AVMEDIA_TYPE_AUDIO;

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

  246.         type = AVMEDIA_TYPE_VIDEO;

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

  248.         type = AVMEDIA_TYPE_VIDEO;

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

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

  251.         type = AVMEDIA_TYPE_DATA;

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

  253.         test_for_ext_stream_audio = 1;

  254.         type = AVMEDIA_TYPE_UNKNOWN;

  255.     } else {

  256.         return -1;

  257.     }

  258.     ff_get_guid(pb, &g);

  259.     total_size = avio_rl64(pb);

  260.     type_specific_size = avio_rl32(pb);

  261.     avio_rl32(pb);

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

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

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

  265. 

  266.     avio_rl32(pb);

  267. 

  268.     if (test_for_ext_stream_audio) {

  269.         ff_get_guid(pb, &g);

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

  271.             type = AVMEDIA_TYPE_AUDIO;

  272.             is_dvr_ms_audio=1;

  273.             ff_get_guid(pb, &g);

  274.             avio_rl32(pb);

  275.             avio_rl32(pb);

  276.             avio_rl32(pb);

  277.             ff_get_guid(pb, &g);

  278.             avio_rl32(pb);

  279.         }

  280.     }

  281. 

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

  283.     if (type == AVMEDIA_TYPE_AUDIO) {

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

  285.         if (ret < 0)

  286.             return ret;

  287.         if (is_dvr_ms_audio) {

  288.             // codec_id and codec_tag are unreliable in dvr_ms

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

  290.             st->request_probe= 1;

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

  292.         }

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

  294.             st->need_parsing = AVSTREAM_PARSE_NONE;

  295.         } else {

  296.             st->need_parsing = AVSTREAM_PARSE_FULL;

  297.         }

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

  299.         pos2 = avio_tell(pb);

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

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

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

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

  304.             avio_rl16(pb); //ds_data_size

  305.             avio_r8(pb);   //ds_silence_data

  306.         }

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

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

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

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

  311.             if (!asf_st->ds_chunk_size

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

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

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

  315.         }

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

  317.             case CODEC_ID_MP3:

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

  319.                 break;

  320.             case CODEC_ID_PCM_S16LE:

  321.             case CODEC_ID_PCM_S16BE:

  322.             case CODEC_ID_PCM_U16LE:

  323.             case CODEC_ID_PCM_U16BE:

  324.             case CODEC_ID_PCM_S8:

  325.             case CODEC_ID_PCM_U8:

  326.             case CODEC_ID_PCM_ALAW:

  327.             case CODEC_ID_PCM_MULAW:

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

  329.                 break;

  330.             default:

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

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

  333.                 break;

  334.         }

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

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

  337.         avio_rl32(pb);

  338.         avio_rl32(pb);

  339.         avio_r8(pb);

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

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

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

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

  344.         /* not available for asf */

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

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

  347.         tag1 = avio_rl32(pb);

  348.         avio_skip(pb, 20);

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

  350.         if (sizeX > 40) {

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

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

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

  354.         }

  355. 

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

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

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

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

  360.             int av_unused i;

  361. #if HAVE_BIGENDIAN

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

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

  364. #else

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

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

  367. #endif

  368.             asf_st->palette_changed = 1;

  369.         }

  370. 

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

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

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

  374.             st->need_parsing = AVSTREAM_PARSE_FULL;

  375.             // 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

  376.             st->codec->width  =

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

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

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

  380.         }

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

  382.             st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;

  383.     }

  384.     pos2 = avio_tell(pb);

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

  386. 

  387.     return 0;

  388. }

  389. 

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

  391. {

  392.     ASFContext *asf = s->priv_data;

  393.     AVIOContext *pb = s->pb;

  394.     ff_asf_guid g;

  395.     int ext_len, payload_ext_ct, stream_ct, i;

  396.     uint32_t ext_d av_unused, leak_rate, stream_num;

  397.     unsigned int stream_languageid_index;

  398. 

  399.     avio_rl64(pb); // starttime

  400.     avio_rl64(pb); // endtime

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

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

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

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

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

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

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

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

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

  410. 

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

  412.     if (stream_num < 128)

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

  414. 

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

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

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

  418. 

  419.     if (stream_num < 128)

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

  421. 

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

  423.         avio_rl16(pb);

  424.         ext_len = avio_rl16(pb);

  425.         avio_skip(pb, ext_len);

  426.     }

  427. 

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

  429.         ff_get_guid(pb, &g);

  430.         ext_d=avio_rl16(pb);

  431.         ext_len=avio_rl32(pb);

  432.         avio_skip(pb, ext_len);

  433.     }

  434. 

  435.     return 0;

  436. }

  437. 

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

  439. {

  440.     AVIOContext *pb = s->pb;

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

  442. 

  443.     len1 = avio_rl16(pb);

  444.     len2 = avio_rl16(pb);

  445.     len3 = avio_rl16(pb);

  446.     len4 = avio_rl16(pb);

  447.     len5 = avio_rl16(pb);

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

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

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

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

  452.     avio_skip(pb, len5);

  453. 

  454.     return 0;

  455. }

  456. 

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

  458. {

  459.     AVIOContext *pb = s->pb;

  460.     ASFContext *asf = s->priv_data;

  461.     int desc_count, i, ret;

  462. 

  463.     desc_count = avio_rl16(pb);

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

  465.         int name_len,value_type,value_len;

  466.         char name[1024];

  467. 

  468.         name_len = avio_rl16(pb);

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

  470.             name_len += 1;

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

  472.             avio_skip(pb, name_len - ret);

  473.         value_type = avio_rl16(pb);

  474.         value_len  = avio_rl16(pb);

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

  476.             value_len += 1;

  477.         /**

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

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

  480.          */

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

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

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

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

  485.         } else

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

  487.     }

  488. 

  489.     return 0;

  490. }

  491. 

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

  493. {

  494.     AVIOContext *pb = s->pb;

  495.     ASFContext *asf = s->priv_data;

  496.     int j, ret;

  497.     int stream_count = avio_rl16(pb);

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

  499.         char lang[6];

  500.         unsigned int lang_len = avio_r8(pb);

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

  502.             avio_skip(pb, lang_len - ret);

  503.         if (j < 128)

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

  505.     }

  506. 

  507.     return 0;

  508. }

  509. 

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

  511. {

  512.     AVIOContext *pb = s->pb;

  513.     ASFContext *asf = s->priv_data;

  514.     int n, stream_num, name_len, value_len, value_type av_unused, value_num;

  515.     int ret, i;

  516.     n = avio_rl16(pb);

  517. 

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

  519.         char name[1024];

  520. 

  521.         avio_rl16(pb); //lang_list_index

  522.         stream_num= avio_rl16(pb);

  523.         name_len=   avio_rl16(pb);

  524.         value_type= avio_rl16(pb);

  525.         value_len=  avio_rl32(pb);

  526. 

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

  528.             avio_skip(pb, name_len - ret);

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

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

  531.         avio_skip(pb, value_len - 2);

  532. 

  533.         if(stream_num<128){

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

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

  536.         }

  537.     }

  538. 

  539.     return 0;

  540. }

  541. 

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

  543. {

  544.     AVIOContext *pb = s->pb;

  545.     int i, count, name_len, ret;

  546.     char name[1024];

  547. 

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

  549.     avio_rl64(pb);            // ...

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

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

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

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

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

  555.     }

  556. 

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

  558.         int64_t pres_time;

  559.         int name_len;

  560. 

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

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

  563.         avio_rl16(pb);             // entry length

  564.         avio_rl32(pb);             // send time

  565.         avio_rl32(pb);             // flags

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

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

  568.             avio_skip(pb, name_len - ret);

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

  570.     }

  571. 

  572.     return 0;

  573. }

  574. 

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

  576. {

  577.     ASFContext *asf = s->priv_data;

  578.     ff_asf_guid g;

  579.     AVIOContext *pb = s->pb;

  580.     int i;

  581.     int64_t gsize;

  582. 

  583.     ff_get_guid(pb, &g);

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

  585.         return -1;

  586.     avio_rl64(pb);

  587.     avio_rl32(pb);

  588.     avio_r8(pb);

  589.     avio_r8(pb);

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

  591.     for(;;) {

  592.         uint64_t gpos= avio_tell(pb);

  593.         ff_get_guid(pb, &g);

  594.         gsize = avio_rl64(pb);

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

  596.         print_guid(&g);

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

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

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

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

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

  602.                 asf->data_object_size = gsize - 24;

  603.             } else {

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

  605.             }

  606.             break;

  607.         }

  608.         if (gsize < 24)

  609.             return -1;

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

  611.             asf_read_file_properties(s, gsize);

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

  613.             asf_read_stream_properties(s, gsize);

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

  615.             asf_read_content_desc(s, gsize);

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

  617.             asf_read_language_list(s, gsize);

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

  619.             asf_read_ext_content_desc(s, gsize);

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

  621.             asf_read_metadata(s, gsize);

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

  623.             asf_read_ext_stream_properties(s, gsize);

  624. 

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

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

  627.             continue;

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

  629.             av_unused int v1, v2;

  630.             ff_get_guid(pb, &g);

  631.             v1 = avio_rl32(pb);

  632.             v2 = avio_rl16(pb);

  633.             continue;

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

  635.             asf_read_marker(s, gsize);

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

  637.             return -1;

  638.         } else {

  639.             if (!s->keylen) {

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

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

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

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

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

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

  646.                 }

  647.             }

  648.         }

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

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

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

  652.     }

  653.     ff_get_guid(pb, &g);

  654.     avio_rl64(pb);

  655.     avio_r8(pb);

  656.     avio_r8(pb);

  657.     if (url_feof(pb))

  658.         return -1;

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

  660.     asf->packet_size_left = 0;

  661. 

  662. 

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

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

  665.         if(stream_num>=0){

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

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

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

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

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

  671.                           &st->sample_aspect_ratio.den,

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

  673.             } 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.

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

  675.                           &st->sample_aspect_ratio.den,

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

  677. 

  678. //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);

  679. 

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

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

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

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

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

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

  686.                     if (iso6392)

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

  688.                 }

  689.             }

  690.         }

  691.     }

  692. 

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

  694. 

  695.     return 0;

  696. }

  697. 

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

  699.     switch (bits & 3) \

  700.     { \

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

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

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

  704.     default: var = defval; break; \

  705.     }

  706. 

  707. /**

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

  709.  * @param s demux context

  710.  * @param pb context to read data from

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

  712.  */

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

  714. {

  715.     ASFContext *asf = s->priv_data;

  716.     uint32_t packet_length, padsize;

  717.     int rsize = 8;

  718.     int c, d, e, off;

  719. 

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

  721.     off= 32768;

  722.     if (s->packet_size > 0)

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

  724. 

  725.     c=d=e=-1;

  726.     while(off-- > 0){

  727.         c=d; d=e;

  728.         e= avio_r8(pb);

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

  730.             break;

  731.     }

  732. 

  733.     if (c != 0x82) {

  734.         /**

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

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

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

  738.          * the stream.

  739.          */

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

  741.             return AVERROR(EAGAIN);

  742.         if (!url_feof(pb))

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

  744.     }

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

  746.         if (d || e) {

  747.             if (!url_feof(pb))

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

  749.             return -1;

  750.         }

  751.         c= avio_r8(pb);

  752.         d= avio_r8(pb);

  753.         rsize+=3;

  754.     }else{

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

  756.     }

  757. 

  758.     asf->packet_flags    = c;

  759.     asf->packet_property = d;

  760. 

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

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

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

  764. 

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

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

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

  768.         return -1;

  769.     }

  770.     if(padsize >= packet_length){

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

  772.         return -1;

  773.     }

  774. 

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

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

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

  778. 

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

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

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

  782.     } else {

  783.         asf->packet_segments = 1;

  784.         asf->packet_segsizetype = 0x80;

  785.     }

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

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

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

  789.     asf->packet_padsize = padsize;

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

  791.     return 0;

  792. }

  793. 

  794. /**

  795.  *

  796.  * @return <0 if error

  797.  */

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

  799.     ASFContext *asf = s->priv_data;

  800.     int rsize = 1;

  801.     int num = avio_r8(pb);

  802.     int64_t ts0, ts1 av_unused;

  803. 

  804.     asf->packet_segments--;

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

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

  807.     // sequence should be ignored!

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

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

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

  811. //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);

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

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

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

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

  816.             return -1;

  817.         }

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

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

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

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

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

  823.             avio_skip(pb, 10);

  824.             ts0= avio_rl64(pb);

  825.             ts1= avio_rl64(pb);

  826.             avio_skip(pb, 12);

  827.             avio_rl32(pb);

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

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

  830.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  831.         }else

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

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

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

  835.         // multipacket - frag_offset is beginning timestamp

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

  837.         asf->packet_frag_offset = 0;

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

  839. 

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

  841.         rsize++;

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

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

  844.         return -1;

  845.     }

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

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

  848.         return -1;

  849.     }

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

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

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

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

  854.             return -1;

  855.         } else 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.         asf->packet_frag_size = asf->packet_size_left - rsize;

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

  869.     }

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

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

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

  873.             return -1;

  874.     }

  875.     asf->packet_size_left -= rsize;

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

  877. 

  878.     return 0;

  879. }

  880. 

  881. /**

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

  883.  * with asf_get_packet()).

  884.  * @param s demux context

  885.  * @param pb context to read data from

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

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

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

  889.  */

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

  891. {

  892.     ASFContext *asf = s->priv_data;

  893.     ASFStream *asf_st = 0;

  894.     for (;;) {

  895.         int ret;

  896.         if(url_feof(pb))

  897.             return AVERROR_EOF;

  898.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  903.             assert(ret>=0);

  904.             /* fail safe */

  905.             avio_skip(pb, ret);

  906. 

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

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

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

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

  911.             return 1;

  912.         }

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

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

  915.                 asf->packet_segments= 0;

  916.                 continue;

  917.             }

  918.             if (asf->stream_index < 0

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

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

  921.                 ) {

  922.                 asf->packet_time_start = 0;

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

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

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

  926.                 if(asf->stream_index < 0)

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

  928.                 continue;

  929.             }

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

  931.         }

  932.         asf_st = asf->asf_st;

  933. 

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

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

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

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

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

  939.             asf->packet_size_left--;

  940.             asf->packet_multi_size--;

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

  942.             {

  943.                 asf->packet_time_start = 0;

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

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

  946.                 continue;

  947.             }

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

  949.             //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);

  950.         }

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

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

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

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

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

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

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

  958.         }

  959. 

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

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

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

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

  964.                 asf_st->frag_offset = 0;

  965.                 av_free_packet(&asf_st->pkt);

  966.             }

  967.             /* new packet */

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

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

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

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

  972.             asf_st->pkt.pos =

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

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

  975.                 uint8_t *pal;

  976.                 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE,

  977.                                               AVPALETTE_SIZE);

  978.                 if (!pal) {

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

  980.                 } else {

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

  982.                     asf_st->palette_changed = 0;

  983.                 }

  984.             }

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

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

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

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

  989.                 asf->packet_key_frame = 1;

  990.             if (asf->packet_key_frame)

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

  992.         }

  993. 

  994.         /* read data */

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

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

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

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

  999.         if (asf->packet_size_left < 0)

  1000.             continue;

  1001. 

  1002.         if(   asf->packet_frag_offset >= asf_st->pkt.size

  1003.            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){

  1004.             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",

  1005.                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);

  1006.             continue;

  1007.         }

  1008. 

  1009.         ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,

  1010.                          asf->packet_frag_size);

  1011.         if (ret != asf->packet_frag_size) {

  1012.             if (ret < 0 || asf->packet_frag_offset + ret == 0)

  1013.                 return ret < 0 ? ret : AVERROR_EOF;

  1014.             if (asf_st->ds_span > 1) {

  1015.                 // scrambling, we can either drop it completely or fill the remainder

  1016.                 // TODO: should we fill the whole packet instead of just the current

  1017.                 // fragment?

  1018.                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,

  1019.                        asf->packet_frag_size - ret);

  1020.                 ret = asf->packet_frag_size;

  1021.             } else

  1022.                 // no scrambling, so we can return partial packets

  1023.                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);

  1024.         }

  1025.         if (s->key && s->keylen == 20)

  1026.             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,

  1027.                             ret);

  1028.         asf_st->frag_offset += ret;

  1029.         /* test if whole packet is read */

  1030.         if (asf_st->frag_offset == asf_st->pkt.size) {

  1031.             //workaround for macroshit radio DVR-MS files

  1032.             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO

  1033.                && asf_st->pkt.size > 100){

  1034.                 int i;

  1035.                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);

  1036.                 if(i == asf_st->pkt.size){

  1037.                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");

  1038.                     asf_st->frag_offset = 0;

  1039.                     av_free_packet(&asf_st->pkt);

  1040.                     continue;

  1041.                 }

  1042.             }

  1043. 

  1044.             /* return packet */

  1045.             if (asf_st->ds_span > 1) {

  1046.               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){

  1047.                     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);

  1048.               }else{

  1049.                 /* packet descrambling */

  1050.                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);

  1051.                 if (newdata) {

  1052.                     int offset = 0;

  1053.                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

  1054.                     while (offset < asf_st->pkt.size) {

  1055.                         int off = offset / asf_st->ds_chunk_size;

  1056.                         int row = off / asf_st->ds_span;

  1057.                         int col = off % asf_st->ds_span;

  1058.                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;

  1059.                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);

  1060. 

  1061.                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);

  1062.                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);

  1063.                         memcpy(newdata + offset,

  1064.                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,

  1065.                                asf_st->ds_chunk_size);

  1066.                         offset += asf_st->ds_chunk_size;

  1067.                     }

  1068.                     av_free(asf_st->pkt.data);

  1069.                     asf_st->pkt.data = newdata;

  1070.                 }

  1071.               }

  1072.             }

  1073.             asf_st->frag_offset = 0;

  1074.             *pkt= asf_st->pkt;

  1075.             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);

  1076.             asf_st->pkt.size = 0;

  1077.             asf_st->pkt.data = 0;

  1078.             break; // packet completed

  1079.         }

  1080.     }

  1081.     return 0;

  1082. }

  1083. 

  1084. static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)

  1085. {

  1086.     ASFContext *asf = s->priv_data;

  1087. 

  1088.     for (;;) {

  1089.         int ret;

  1090. 

  1091.         /* parse cached packets, if any */

  1092.         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)

  1093.             return ret;

  1094.         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)

  1095.             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);

  1096.         asf->packet_time_start = 0;

  1097.     }

  1098. 

  1099.     return 0;

  1100. }

  1101. 

  1102. // Added to support seeking after packets have been read

  1103. // If information is not reset, read_packet fails due to

  1104. // leftover information from previous reads

  1105. static void asf_reset_header(AVFormatContext *s)

  1106. {

  1107.     ASFContext *asf = s->priv_data;

  1108.     ASFStream *asf_st;

  1109.     int i;

  1110. 

  1111.     asf->packet_size_left = 0;

  1112.     asf->packet_segments = 0;

  1113.     asf->packet_flags = 0;

  1114.     asf->packet_property = 0;

  1115.     asf->packet_timestamp = 0;

  1116.     asf->packet_segsizetype = 0;

  1117.     asf->packet_segments = 0;

  1118.     asf->packet_seq = 0;

  1119.     asf->packet_replic_size = 0;

  1120.     asf->packet_key_frame = 0;

  1121.     asf->packet_padsize = 0;

  1122.     asf->packet_frag_offset = 0;

  1123.     asf->packet_frag_size = 0;

  1124.     asf->packet_frag_timestamp = 0;

  1125.     asf->packet_multi_size = 0;

  1126.     asf->packet_obj_size = 0;

  1127.     asf->packet_time_delta = 0;

  1128.     asf->packet_time_start = 0;

  1129. 

  1130.     for(i=0; i<s->nb_streams; i++){

  1131.         asf_st= s->streams[i]->priv_data;

  1132.         av_free_packet(&asf_st->pkt);

  1133.         asf_st->frag_offset=0;

  1134.         asf_st->seq=0;

  1135.     }

  1136.     asf->asf_st= NULL;

  1137. }

  1138. 

  1139. static int asf_read_close(AVFormatContext *s)

  1140. {

  1141.     asf_reset_header(s);

  1142. 

  1143.     return 0;

  1144. }

  1145. 

  1146. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  1147. {

  1148.     AVPacket pkt1, *pkt = &pkt1;

  1149.     ASFStream *asf_st;

  1150.     int64_t pts;

  1151.     int64_t pos= *ppos;

  1152.     int i;

  1153.     int64_t start_pos[ASF_MAX_STREAMS];

  1154. 

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

  1156.         start_pos[i]= pos;

  1157.     }

  1158. 

  1159.     if (s->packet_size > 0)

  1160.         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;

  1161.     *ppos= pos;

  1162.     avio_seek(s->pb, pos, SEEK_SET);

  1163. 

  1164. //printf("asf_read_pts\n");

  1165.     asf_reset_header(s);

  1166.     for(;;){

  1167.         if (av_read_frame(s, pkt) < 0){

  1168.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1169.             return AV_NOPTS_VALUE;

  1170.         }

  1171. 

  1172.         pts= pkt->pts;

  1173. 

  1174.         av_free_packet(pkt);

  1175.         if(pkt->flags&AV_PKT_FLAG_KEY){

  1176.             i= pkt->stream_index;

  1177. 

  1178.             asf_st= s->streams[i]->priv_data;

  1179. 

  1180. //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);

  1181.             pos= asf_st->packet_pos;

  1182. 

  1183.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1184.             start_pos[i]= asf_st->packet_pos + 1;

  1185. 

  1186.             if(pkt->stream_index == stream_index)

  1187.                break;

  1188.         }

  1189.     }

  1190. 

  1191.     *ppos= pos;

  1192. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1193. 

  1194.     return pts;

  1195. }

  1196. 

  1197. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1198. {

  1199.     ff_asf_guid g;

  1200.     ASFContext *asf = s->priv_data;

  1201.     int64_t current_pos= avio_tell(s->pb);

  1202.     int i;

  1203. 

  1204.     avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);

  1205.     ff_get_guid(s->pb, &g);

  1206. 

  1207.     /* the data object can be followed by other top-level objects,

  1208.        skip them until the simple index object is reached */

  1209.     while (ff_guidcmp(&g, &index_guid)) {

  1210.         int64_t gsize= avio_rl64(s->pb);

  1211.         if (gsize < 24 || url_feof(s->pb)) {

  1212.             avio_seek(s->pb, current_pos, SEEK_SET);

  1213.             return;

  1214.         }

  1215.         avio_skip(s->pb, gsize-24);

  1216.         ff_get_guid(s->pb, &g);

  1217.     }

  1218. 

  1219.     {

  1220.         int64_t itime, last_pos=-1;

  1221.         int pct, ict;

  1222.         int64_t av_unused gsize= avio_rl64(s->pb);

  1223.         ff_get_guid(s->pb, &g);

  1224.         itime=avio_rl64(s->pb);

  1225.         pct=avio_rl32(s->pb);

  1226.         ict=avio_rl32(s->pb);

  1227.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1228. 

  1229.         for (i=0;i<ict;i++){

  1230.             int pktnum=avio_rl32(s->pb);

  1231.             int pktct =avio_rl16(s->pb);

  1232.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1233.             int64_t index_pts= FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);

  1234. 

  1235.             if(pos != last_pos){

  1236.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d  pts: %"PRId64"\n", pktnum, pktct, index_pts);

  1237.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1238.             last_pos=pos;

  1239.             }

  1240.         }

  1241.         asf->index_read= 1;

  1242.     }

  1243.     avio_seek(s->pb, current_pos, SEEK_SET);

  1244. }

  1245. 

  1246. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1247. {

  1248.     ASFContext *asf = s->priv_data;

  1249.     AVStream *st = s->streams[stream_index];

  1250.     int64_t pos;

  1251.     int index;

  1252. 

  1253.     if (s->packet_size <= 0)

  1254.         return -1;

  1255. 

  1256.     /* Try using the protocol's read_seek if available */

  1257.     if(s->pb) {

  1258.         int ret = avio_seek_time(s->pb, stream_index, pts, flags);

  1259.         if(ret >= 0)

  1260.             asf_reset_header(s);

  1261.         if (ret != AVERROR(ENOSYS))

  1262.             return ret;

  1263.     }

  1264. 

  1265.     if (!asf->index_read)

  1266.         asf_build_simple_index(s, stream_index);

  1267. 

  1268.     if((asf->index_read && st->index_entries)){

  1269.         index= av_index_search_timestamp(st, pts, flags);

  1270.         if(index >= 0) {

  1271.             /* find the position */

  1272.             pos = st->index_entries[index].pos;

  1273. 

  1274.             /* do the seek */

  1275.             av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1276.             avio_seek(s->pb, pos, SEEK_SET);

  1277.             asf_reset_header(s);

  1278.             return 0;

  1279.         }

  1280.     }

  1281.     /* no index or seeking by index failed */

  1282.     if(av_seek_frame_binary(s, stream_index, pts, flags)<0)

  1283.         return -1;

  1284.     asf_reset_header(s);

  1285.     return 0;

  1286. }

  1287. 

  1288. AVInputFormat ff_asf_demuxer = {

  1289.     "asf",

  1290.     NULL_IF_CONFIG_SMALL("ASF format"),

  1291.     sizeof(ASFContext),

  1292.     asf_probe,

  1293.     asf_read_header,

  1294.     asf_read_packet,

  1295.     asf_read_close,

  1296.     asf_read_seek,

  1297.     asf_read_pts,

  1298.     .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,

  1299. };