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FFmpeg/libavformat/asfdec.c

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  1. /*

  2.  * ASF compatible demuxer

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

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. //#define DEBUG

  23. 

  24. #include "libavutil/bswap.h"

  25. #include "libavutil/common.h"

  26. #include "libavutil/avstring.h"

  27. #include "libavutil/dict.h"

  28. #include "libavcodec/mpegaudio.h"

  29. #include "avformat.h"

  30. #include "avio_internal.h"

  31. #include "riff.h"

  32. #include "asf.h"

  33. #include "asfcrypt.h"

  34. #include "avlanguage.h"

  35. 

  36. typedef struct {

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

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

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

  40.     AVRational dar[128];

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

  42.     /* non streamed additonnal info */

  43.     /* packet filling */

  44.     int packet_size_left;

  45.     /* only for reading */

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

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

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

  49.     int index_read;

  50. 

  51.     ASFMainHeader hdr;

  52. 

  53.     int packet_flags;

  54.     int packet_property;

  55.     int packet_timestamp;

  56.     int packet_segsizetype;

  57.     int packet_segments;

  58.     int packet_seq;

  59.     int packet_replic_size;

  60.     int packet_key_frame;

  61.     int packet_padsize;

  62.     unsigned int packet_frag_offset;

  63.     unsigned int packet_frag_size;

  64.     int64_t packet_frag_timestamp;

  65.     int packet_multi_size;

  66.     int packet_obj_size;

  67.     int packet_time_delta;

  68.     int packet_time_start;

  69.     int64_t packet_pos;

  70. 

  71.     int stream_index;

  72. 

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

  74. } ASFContext;

  75. 

  76. #undef NDEBUG

  77. #include <assert.h>

  78. 

  79. #define ASF_MAX_STREAMS 127

  80. #define FRAME_HEADER_SIZE 17

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

  82. 

  83. static const ff_asf_guid index_guid = {

  84.     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb

  85. };

  86. 

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

  88.     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2

  89. };

  90. /**********************************/

  91. /* decoding */

  92. 

  93. #ifdef DEBUG

  94. #define PRINT_IF_GUID(g,cmp) \

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

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

  97. 

  98. static void print_guid(const ff_asf_guid *g)

  99. {

  100.     int i;

  101.     PRINT_IF_GUID(g, ff_asf_header);

  102.     else PRINT_IF_GUID(g, ff_asf_file_header);

  103.     else PRINT_IF_GUID(g, ff_asf_stream_header);

  104.     else PRINT_IF_GUID(g, ff_asf_audio_stream);

  105.     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);

  106.     else PRINT_IF_GUID(g, ff_asf_video_stream);

  107.     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);

  108.     else PRINT_IF_GUID(g, ff_asf_command_stream);

  109.     else PRINT_IF_GUID(g, ff_asf_comment_header);

  110.     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);

  111.     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);

  112.     else PRINT_IF_GUID(g, ff_asf_data_header);

  113.     else PRINT_IF_GUID(g, index_guid);

  114.     else PRINT_IF_GUID(g, ff_asf_head1_guid);

  115.     else PRINT_IF_GUID(g, ff_asf_head2_guid);

  116.     else PRINT_IF_GUID(g, ff_asf_my_guid);

  117.     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);

  118.     else PRINT_IF_GUID(g, ff_asf_extended_content_header);

  119.     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);

  120.     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);

  121.     else PRINT_IF_GUID(g, ff_asf_metadata_header);

  122.     else PRINT_IF_GUID(g, ff_asf_marker_header);

  123.     else PRINT_IF_GUID(g, stream_bitrate_guid);

  124.     else PRINT_IF_GUID(g, ff_asf_language_guid);

  125.     else

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

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

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

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

  130. }

  131. #undef PRINT_IF_GUID

  132. #else

  133. #define print_guid(g)

  134. #endif

  135. 

  136. static int asf_probe(AVProbeData *pd)

  137. {

  138.     /* check file header */

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

  140.         return AVPROBE_SCORE_MAX;

  141.     else

  142.         return 0;

  143. }

  144. 

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

  146.     switch(type){

  147.         case 2: return avio_rl32(pb);

  148.         case 3: return avio_rl32(pb);

  149.         case 4: return avio_rl64(pb);

  150.         case 5: return avio_rl16(pb);

  151.         default:return INT_MIN;

  152.     }

  153. }

  154. 

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

  156. {

  157.     char *value;

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

  159. 

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

  161.         return;

  162. 

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

  164.     if (!value)

  165.         goto finish;

  166. 

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

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

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

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

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

  172.     } else {

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

  174.         goto finish;

  175.     }

  176.     if (*value)

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

  178. finish:

  179.     av_freep(&value);

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

  181. }

  182. 

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

  184. {

  185.     ASFContext *asf = s->priv_data;

  186.     AVIOContext *pb = s->pb;

  187. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  201. 

  202.     return 0;

  203. }

  204. 

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

  206. {

  207.     ASFContext *asf = s->priv_data;

  208.     AVIOContext *pb = s->pb;

  209.     AVStream *st;

  210.     ASFStream *asf_st;

  211.     ff_asf_guid g;

  212.     enum AVMediaType type;

  213.     int type_specific_size, sizeX;

  214.     unsigned int tag1;

  215.     int64_t pos1, pos2, start_time;

  216.     int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  217. 

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

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

  220.         return AVERROR(EINVAL);

  221.     }

  222. 

  223.     pos1 = avio_tell(pb);

  224. 

  225.     st = av_new_stream(s, 0);

  226.     if (!st)

  227.         return AVERROR(ENOMEM);

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

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

  230.     if (!asf_st)

  231.         return AVERROR(ENOMEM);

  232.     st->priv_data = asf_st;

  233.     start_time = asf->hdr.preroll;

  234. 

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

  236. 

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

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

  239.             (10000000 / 1000) - start_time;

  240.     }

  241.     ff_get_guid(pb, &g);

  242. 

  243.     test_for_ext_stream_audio = 0;

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

  245.         type = AVMEDIA_TYPE_AUDIO;

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

  247.         type = AVMEDIA_TYPE_VIDEO;

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

  249.         type = AVMEDIA_TYPE_VIDEO;

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

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

  252.         type = AVMEDIA_TYPE_DATA;

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

  254.         test_for_ext_stream_audio = 1;

  255.         type = AVMEDIA_TYPE_UNKNOWN;

  256.     } else {

  257.         return -1;

  258.     }

  259.     ff_get_guid(pb, &g);

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

  261.     type_specific_size = avio_rl32(pb);

  262.     avio_rl32(pb);

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

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

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

  266. 

  267.     avio_rl32(pb);

  268. 

  269.     if (test_for_ext_stream_audio) {

  270.         ff_get_guid(pb, &g);

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

  272.             type = AVMEDIA_TYPE_AUDIO;

  273.             is_dvr_ms_audio=1;

  274.             ff_get_guid(pb, &g);

  275.             avio_rl32(pb);

  276.             avio_rl32(pb);

  277.             avio_rl32(pb);

  278.             ff_get_guid(pb, &g);

  279.             avio_rl32(pb);

  280.         }

  281.     }

  282. 

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

  284.     if (type == AVMEDIA_TYPE_AUDIO) {

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

  286.         if (ret < 0)

  287.             return ret;

  288.         if (is_dvr_ms_audio) {

  289.             // codec_id and codec_tag are unreliable in dvr_ms

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

  291.             st->request_probe= 1;

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

  293.         }

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

  295.             st->need_parsing = AVSTREAM_PARSE_NONE;

  296.         } else {

  297.             st->need_parsing = AVSTREAM_PARSE_FULL;

  298.         }

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

  300.         pos2 = avio_tell(pb);

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

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

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

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

  305.             avio_rl16(pb); //ds_data_size

  306.             avio_r8(pb);   //ds_silence_data

  307.         }

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

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

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

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

  312.             if (!asf_st->ds_chunk_size

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

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

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

  316.         }

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

  318.             case CODEC_ID_MP3:

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

  320.                 break;

  321.             case CODEC_ID_PCM_S16LE:

  322.             case CODEC_ID_PCM_S16BE:

  323.             case CODEC_ID_PCM_U16LE:

  324.             case CODEC_ID_PCM_U16BE:

  325.             case CODEC_ID_PCM_S8:

  326.             case CODEC_ID_PCM_U8:

  327.             case CODEC_ID_PCM_ALAW:

  328.             case CODEC_ID_PCM_MULAW:

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

  330.                 break;

  331.             default:

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

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

  334.                 break;

  335.         }

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

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

  338.         avio_rl32(pb);

  339.         avio_rl32(pb);

  340.         avio_r8(pb);

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

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

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

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

  345.         /* not available for asf */

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

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

  348.         tag1 = avio_rl32(pb);

  349.         avio_skip(pb, 20);

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

  351.         if (sizeX > 40) {

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

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

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

  355.         }

  356. 

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

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

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

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

  361.             int av_unused i;

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

  363. #if HAVE_BIGENDIAN

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

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

  366. #else

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

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

  369. #endif

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

  371.         }

  372. 

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

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

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

  376.             st->need_parsing = AVSTREAM_PARSE_FULL;

  377.             // 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

  378.             st->codec->width  =

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

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

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

  382.         }

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

  384.             st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;

  385.     }

  386.     pos2 = avio_tell(pb);

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

  388. 

  389.     return 0;

  390. }

  391. 

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

  393. {

  394.     ASFContext *asf = s->priv_data;

  395.     AVIOContext *pb = s->pb;

  396.     ff_asf_guid g;

  397.     int ext_len, payload_ext_ct, stream_ct, i;

  398.     uint32_t leak_rate, stream_num;

  399.     unsigned int stream_languageid_index;

  400. 

  401.     avio_rl64(pb); // starttime

  402.     avio_rl64(pb); // endtime

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

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

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

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

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

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

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

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

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

  412. 

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

  414.     if (stream_num < 128)

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

  416. 

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

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

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

  420. 

  421.     if (stream_num < 128)

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

  423. 

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

  425.         avio_rl16(pb);

  426.         ext_len = avio_rl16(pb);

  427.         avio_skip(pb, ext_len);

  428.     }

  429. 

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

  431.         ff_get_guid(pb, &g);

  432.         avio_skip(pb, 2);

  433.         ext_len=avio_rl32(pb);

  434.         avio_skip(pb, ext_len);

  435.     }

  436. 

  437.     return 0;

  438. }

  439. 

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

  441. {

  442.     AVIOContext *pb = s->pb;

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

  444. 

  445.     len1 = avio_rl16(pb);

  446.     len2 = avio_rl16(pb);

  447.     len3 = avio_rl16(pb);

  448.     len4 = avio_rl16(pb);

  449.     len5 = avio_rl16(pb);

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

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

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

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

  454.     avio_skip(pb, len5);

  455. 

  456.     return 0;

  457. }

  458. 

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

  460. {

  461.     AVIOContext *pb = s->pb;

  462.     ASFContext *asf = s->priv_data;

  463.     int desc_count, i, ret;

  464. 

  465.     desc_count = avio_rl16(pb);

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

  467.         int name_len,value_type,value_len;

  468.         char name[1024];

  469. 

  470.         name_len = avio_rl16(pb);

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

  472.             name_len += 1;

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

  474.             avio_skip(pb, name_len - ret);

  475.         value_type = avio_rl16(pb);

  476.         value_len  = avio_rl16(pb);

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

  478.             value_len += 1;

  479.         /**

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

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

  482.          */

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

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

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

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

  487.         } else

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

  489.     }

  490. 

  491.     return 0;

  492. }

  493. 

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

  495. {

  496.     AVIOContext *pb = s->pb;

  497.     ASFContext *asf = s->priv_data;

  498.     int j, ret;

  499.     int stream_count = avio_rl16(pb);

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

  501.         char lang[6];

  502.         unsigned int lang_len = avio_r8(pb);

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

  504.             avio_skip(pb, lang_len - ret);

  505.         if (j < 128)

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

  507.     }

  508. 

  509.     return 0;

  510. }

  511. 

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

  513. {

  514.     AVIOContext *pb = s->pb;

  515.     ASFContext *asf = s->priv_data;

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

  517.     int ret, i;

  518.     n = avio_rl16(pb);

  519. 

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

  521.         char name[1024];

  522. 

  523.         avio_rl16(pb); //lang_list_index

  524.         stream_num= avio_rl16(pb);

  525.         name_len=   avio_rl16(pb);

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

  527.         value_len=  avio_rl32(pb);

  528. 

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

  530.             avio_skip(pb, name_len - ret);

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

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

  533.         avio_skip(pb, value_len - 2);

  534. 

  535.         if(stream_num<128){

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

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

  538.         }

  539.     }

  540. 

  541.     return 0;

  542. }

  543. 

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

  545. {

  546.     AVIOContext *pb = s->pb;

  547.     int i, count, name_len, ret;

  548.     char name[1024];

  549. 

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

  551.     avio_rl64(pb);            // ...

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

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

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

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

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

  557.     }

  558. 

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

  560.         int64_t pres_time;

  561.         int name_len;

  562. 

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

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

  565.         avio_rl16(pb);             // entry length

  566.         avio_rl32(pb);             // send time

  567.         avio_rl32(pb);             // flags

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

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

  570.             avio_skip(pb, name_len - ret);

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

  572.     }

  573. 

  574.     return 0;

  575. }

  576. 

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

  578. {

  579.     ASFContext *asf = s->priv_data;

  580.     ff_asf_guid g;

  581.     AVIOContext *pb = s->pb;

  582.     int i;

  583.     int64_t gsize;

  584. 

  585.     ff_get_guid(pb, &g);

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

  587.         return -1;

  588.     avio_rl64(pb);

  589.     avio_rl32(pb);

  590.     avio_r8(pb);

  591.     avio_r8(pb);

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

  593.     for(;;) {

  594.         uint64_t gpos= avio_tell(pb);

  595.         ff_get_guid(pb, &g);

  596.         gsize = avio_rl64(pb);

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

  598.         print_guid(&g);

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

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

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

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

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

  604.                 asf->data_object_size = gsize - 24;

  605.             } else {

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

  607.             }

  608.             break;

  609.         }

  610.         if (gsize < 24)

  611.             return -1;

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

  613.             asf_read_file_properties(s, gsize);

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

  615.             asf_read_stream_properties(s, gsize);

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

  617.             asf_read_content_desc(s, gsize);

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

  619.             asf_read_language_list(s, gsize);

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

  621.             asf_read_ext_content_desc(s, gsize);

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

  623.             asf_read_metadata(s, gsize);

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

  625.             asf_read_ext_stream_properties(s, gsize);

  626. 

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

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

  629.             continue;

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

  631.             ff_get_guid(pb, &g);

  632.             avio_skip(pb, 6);

  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_dict_set(&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;

  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.             avio_skip(pb, 8);;

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

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

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

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

  978.                 asf->packet_key_frame = 1;

  979.             if (asf->packet_key_frame)

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

  981.         }

  982. 

  983.         /* read data */

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

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

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

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

  988.         if (asf->packet_size_left < 0)

  989.             continue;

  990. 

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

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

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

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

  995.             continue;

  996.         }

  997. 

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

  999.                          asf->packet_frag_size);

  1000.         if (ret != asf->packet_frag_size) {

  1001.             if (ret < 0 || asf->packet_frag_offset + ret == 0)

  1002.                 return ret < 0 ? ret : AVERROR_EOF;

  1003.             if (asf_st->ds_span > 1) {

  1004.                 // scrambling, we can either drop it completely or fill the remainder

  1005.                 // TODO: should we fill the whole packet instead of just the current

  1006.                 // fragment?

  1007.                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,

  1008.                        asf->packet_frag_size - ret);

  1009.                 ret = asf->packet_frag_size;

  1010.             } else

  1011.                 // no scrambling, so we can return partial packets

  1012.                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);

  1013.         }

  1014.         if (s->key && s->keylen == 20)

  1015.             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,

  1016.                             ret);

  1017.         asf_st->frag_offset += ret;

  1018.         /* test if whole packet is read */

  1019.         if (asf_st->frag_offset == asf_st->pkt.size) {

  1020.             //workaround for macroshit radio DVR-MS files

  1021.             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO

  1022.                && asf_st->pkt.size > 100){

  1023.                 int i;

  1024.                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);

  1025.                 if(i == asf_st->pkt.size){

  1026.                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");

  1027.                     asf_st->frag_offset = 0;

  1028.                     av_free_packet(&asf_st->pkt);

  1029.                     continue;

  1030.                 }

  1031.             }

  1032. 

  1033.             /* return packet */

  1034.             if (asf_st->ds_span > 1) {

  1035.               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){

  1036.                     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);

  1037.               }else{

  1038.                 /* packet descrambling */

  1039.                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);

  1040.                 if (newdata) {

  1041.                     int offset = 0;

  1042.                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

  1043.                     while (offset < asf_st->pkt.size) {

  1044.                         int off = offset / asf_st->ds_chunk_size;

  1045.                         int row = off / asf_st->ds_span;

  1046.                         int col = off % asf_st->ds_span;

  1047.                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;

  1048.                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);

  1049. 

  1050.                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);

  1051.                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);

  1052.                         memcpy(newdata + offset,

  1053.                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,

  1054.                                asf_st->ds_chunk_size);

  1055.                         offset += asf_st->ds_chunk_size;

  1056.                     }

  1057.                     av_free(asf_st->pkt.data);

  1058.                     asf_st->pkt.data = newdata;

  1059.                 }

  1060.               }

  1061.             }

  1062.             asf_st->frag_offset = 0;

  1063.             *pkt= asf_st->pkt;

  1064.             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);

  1065.             asf_st->pkt.size = 0;

  1066.             asf_st->pkt.data = 0;

  1067.             break; // packet completed

  1068.         }

  1069.     }

  1070.     return 0;

  1071. }

  1072. 

  1073. static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)

  1074. {

  1075.     ASFContext *asf = s->priv_data;

  1076. 

  1077.     for (;;) {

  1078.         int ret;

  1079. 

  1080.         /* parse cached packets, if any */

  1081.         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)

  1082.             return ret;

  1083.         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)

  1084.             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);

  1085.         asf->packet_time_start = 0;

  1086.     }

  1087. 

  1088.     return 0;

  1089. }

  1090. 

  1091. // Added to support seeking after packets have been read

  1092. // If information is not reset, read_packet fails due to

  1093. // leftover information from previous reads

  1094. static void asf_reset_header(AVFormatContext *s)

  1095. {

  1096.     ASFContext *asf = s->priv_data;

  1097.     ASFStream *asf_st;

  1098.     int i;

  1099. 

  1100.     asf->packet_size_left = 0;

  1101.     asf->packet_segments = 0;

  1102.     asf->packet_flags = 0;

  1103.     asf->packet_property = 0;

  1104.     asf->packet_timestamp = 0;

  1105.     asf->packet_segsizetype = 0;

  1106.     asf->packet_segments = 0;

  1107.     asf->packet_seq = 0;

  1108.     asf->packet_replic_size = 0;

  1109.     asf->packet_key_frame = 0;

  1110.     asf->packet_padsize = 0;

  1111.     asf->packet_frag_offset = 0;

  1112.     asf->packet_frag_size = 0;

  1113.     asf->packet_frag_timestamp = 0;

  1114.     asf->packet_multi_size = 0;

  1115.     asf->packet_obj_size = 0;

  1116.     asf->packet_time_delta = 0;

  1117.     asf->packet_time_start = 0;

  1118. 

  1119.     for(i=0; i<s->nb_streams; i++){

  1120.         asf_st= s->streams[i]->priv_data;

  1121.         av_free_packet(&asf_st->pkt);

  1122.         asf_st->frag_offset=0;

  1123.         asf_st->seq=0;

  1124.     }

  1125.     asf->asf_st= NULL;

  1126. }

  1127. 

  1128. static int asf_read_close(AVFormatContext *s)

  1129. {

  1130.     int i;

  1131.     asf_reset_header(s);

  1132. 

  1133.     for(i=0;i<s->nb_streams;i++) {

  1134.         AVStream *st = s->streams[i];

  1135.         av_free(st->codec->palctrl);

  1136.     }

  1137. 

  1138.     return 0;

  1139. }

  1140. 

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

  1142. {

  1143.     AVPacket pkt1, *pkt = &pkt1;

  1144.     ASFStream *asf_st;

  1145.     int64_t pts;

  1146.     int64_t pos= *ppos;

  1147.     int i;

  1148.     int64_t start_pos[ASF_MAX_STREAMS];

  1149. 

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

  1151.         start_pos[i]= pos;

  1152.     }

  1153. 

  1154.     if (s->packet_size > 0)

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

  1156.     *ppos= pos;

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

  1158. 

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

  1160.     asf_reset_header(s);

  1161.     for(;;){

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

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

  1164.             return AV_NOPTS_VALUE;

  1165.         }

  1166. 

  1167.         pts= pkt->pts;

  1168. 

  1169.         av_free_packet(pkt);

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

  1171.             i= pkt->stream_index;

  1172. 

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

  1174. 

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

  1176.             pos= asf_st->packet_pos;

  1177. 

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

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

  1180. 

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

  1182.                break;

  1183.         }

  1184.     }

  1185. 

  1186.     *ppos= pos;

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

  1188. 

  1189.     return pts;

  1190. }

  1191. 

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

  1193. {

  1194.     ff_asf_guid g;

  1195.     ASFContext *asf = s->priv_data;

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

  1197.     int i;

  1198. 

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

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

  1201. 

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

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

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

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

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

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

  1208.             return;

  1209.         }

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

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

  1212.     }

  1213. 

  1214.     {

  1215.         int64_t itime, last_pos=-1;

  1216.         int pct, ict;

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

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

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

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

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

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

  1223. 

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

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

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

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

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

  1229. 

  1230.             if(pos != last_pos){

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

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

  1233.             last_pos=pos;

  1234.             }

  1235.         }

  1236.         asf->index_read= 1;

  1237.     }

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

  1239. }

  1240. 

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

  1242. {

  1243.     ASFContext *asf = s->priv_data;

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

  1245.     int64_t pos;

  1246.     int index;

  1247. 

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

  1249.         return -1;

  1250. 

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

  1252.     if(s->pb) {

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

  1254.         if(ret >= 0)

  1255.             asf_reset_header(s);

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

  1257.             return ret;

  1258.     }

  1259. 

  1260.     if (!asf->index_read)

  1261.         asf_build_simple_index(s, stream_index);

  1262. 

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

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

  1265.         if(index >= 0) {

  1266.             /* find the position */

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

  1268. 

  1269.             /* do the seek */

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

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

  1272.             asf_reset_header(s);

  1273.             return 0;

  1274.         }

  1275.     }

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

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

  1278.         return -1;

  1279.     asf_reset_header(s);

  1280.     return 0;

  1281. }

  1282. 

  1283. AVInputFormat ff_asf_demuxer = {

  1284.     "asf",

  1285.     NULL_IF_CONFIG_SMALL("ASF format"),

  1286.     sizeof(ASFContext),

  1287.     asf_probe,

  1288.     asf_read_header,

  1289.     asf_read_packet,

  1290.     asf_read_close,

  1291.     asf_read_seek,

  1292.     asf_read_pts,

  1293.     .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,

  1294. };