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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/common.h"

  25. #include "libavutil/avstring.h"

  26. #include "libavcodec/mpegaudio.h"

  27. #include "avformat.h"

  28. #include "riff.h"

  29. #include "asf.h"

  30. #include "asfcrypt.h"

  31. #include "avlanguage.h"

  32. 

  33. void ff_mms_set_stream_selection(URLContext *h, AVFormatContext *format);

  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. void ff_get_guid(ByteIOContext *s, ff_asf_guid *g)

  136. {

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

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

  139. }

  140. 

  141. static int asf_probe(AVProbeData *pd)

  142. {

  143.     /* check file header */

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

  145.         return AVPROBE_SCORE_MAX;

  146.     else

  147.         return 0;

  148. }

  149. 

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

  151.     switch(type){

  152.         case 2: return get_le32(pb);

  153.         case 3: return get_le32(pb);

  154.         case 4: return get_le64(pb);

  155.         case 5: return get_le16(pb);

  156.         default:return INT_MIN;

  157.     }

  158. }

  159. 

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

  161. {

  162.     char *value;

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

  164. 

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

  166.         return;

  167. 

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

  169.     if (!value)

  170.         goto finish;

  171. 

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

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

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

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

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

  177.     } else {

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

  179.         goto finish;

  180.     }

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

  182. finish:

  183.     av_freep(&value);

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

  185. }

  186. 

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

  188. {

  189.     ASFContext *asf = s->priv_data;

  190.     ByteIOContext *pb = s->pb;

  191. 

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

  193.     asf->hdr.file_size          = get_le64(pb);

  194.     asf->hdr.create_time        = get_le64(pb);

  195.     get_le64(pb);                               /* number of packets */

  196.     asf->hdr.play_time          = get_le64(pb);

  197.     asf->hdr.send_time          = get_le64(pb);

  198.     asf->hdr.preroll            = get_le32(pb);

  199.     asf->hdr.ignore             = get_le32(pb);

  200.     asf->hdr.flags              = get_le32(pb);

  201.     asf->hdr.min_pktsize        = get_le32(pb);

  202.     asf->hdr.max_pktsize        = get_le32(pb);

  203.     asf->hdr.max_bitrate        = get_le32(pb);

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

  205. 

  206.     return 0;

  207. }

  208. 

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

  210. {

  211.     ASFContext *asf = s->priv_data;

  212.     ByteIOContext *pb = s->pb;

  213.     AVStream *st;

  214.     ASFStream *asf_st;

  215.     ff_asf_guid g;

  216.     enum AVMediaType type;

  217.     int type_specific_size, sizeX;

  218.     uint64_t total_size;

  219.     unsigned int tag1;

  220.     int64_t pos1, pos2, start_time;

  221.     int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  222. 

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

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

  225.         return AVERROR(EINVAL);

  226.     }

  227. 

  228.     pos1 = url_ftell(pb);

  229. 

  230.     st = av_new_stream(s, 0);

  231.     if (!st)

  232.         return AVERROR(ENOMEM);

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

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

  235.     if (!asf_st)

  236.         return AVERROR(ENOMEM);

  237.     st->priv_data = asf_st;

  238.     start_time = asf->hdr.preroll;

  239. 

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

  241. 

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

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

  244.             (10000000 / 1000) - start_time;

  245.     }

  246.     ff_get_guid(pb, &g);

  247. 

  248.     test_for_ext_stream_audio = 0;

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

  250.         type = AVMEDIA_TYPE_AUDIO;

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

  252.         type = AVMEDIA_TYPE_VIDEO;

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

  254.         type = AVMEDIA_TYPE_VIDEO;

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

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

  257.         type = AVMEDIA_TYPE_DATA;

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

  259.         test_for_ext_stream_audio = 1;

  260.         type = AVMEDIA_TYPE_UNKNOWN;

  261.     } else {

  262.         return -1;

  263.     }

  264.     ff_get_guid(pb, &g);

  265.     total_size = get_le64(pb);

  266.     type_specific_size = get_le32(pb);

  267.     get_le32(pb);

  268.     st->id = get_le16(pb) & 0x7f; /* stream id */

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

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

  271. 

  272.     get_le32(pb);

  273. 

  274.     if (test_for_ext_stream_audio) {

  275.         ff_get_guid(pb, &g);

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

  277.             type = AVMEDIA_TYPE_AUDIO;

  278.             is_dvr_ms_audio=1;

  279.             ff_get_guid(pb, &g);

  280.             get_le32(pb);

  281.             get_le32(pb);

  282.             get_le32(pb);

  283.             ff_get_guid(pb, &g);

  284.             get_le32(pb);

  285.         }

  286.     }

  287. 

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

  289.     if (type == AVMEDIA_TYPE_AUDIO) {

  290.         ff_get_wav_header(pb, st->codec, type_specific_size);

  291.         if (is_dvr_ms_audio) {

  292.             // codec_id and codec_tag are unreliable in dvr_ms

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

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

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

  296.         }

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

  298.             st->need_parsing = AVSTREAM_PARSE_NONE;

  299.         } else {

  300.             st->need_parsing = AVSTREAM_PARSE_FULL;

  301.         }

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

  303.         pos2 = url_ftell(pb);

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

  305.             asf_st->ds_span = get_byte(pb);

  306.             asf_st->ds_packet_size = get_le16(pb);

  307.             asf_st->ds_chunk_size = get_le16(pb);

  308.             get_le16(pb); //ds_data_size

  309.             get_byte(pb); //ds_silence_data

  310.         }

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

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

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

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

  315.             if (!asf_st->ds_chunk_size

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

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

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

  319.         }

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

  321.             case CODEC_ID_MP3:

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

  323.                 break;

  324.             case CODEC_ID_PCM_S16LE:

  325.             case CODEC_ID_PCM_S16BE:

  326.             case CODEC_ID_PCM_U16LE:

  327.             case CODEC_ID_PCM_U16BE:

  328.             case CODEC_ID_PCM_S8:

  329.             case CODEC_ID_PCM_U8:

  330.             case CODEC_ID_PCM_ALAW:

  331.             case CODEC_ID_PCM_MULAW:

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

  333.                 break;

  334.             default:

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

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

  337.                 break;

  338.         }

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

  340.             size - (url_ftell(pb) - pos1 + 24) >= 51) {

  341.         get_le32(pb);

  342.         get_le32(pb);

  343.         get_byte(pb);

  344.         get_le16(pb);        /* size */

  345.         sizeX= get_le32(pb); /* size */

  346.         st->codec->width = get_le32(pb);

  347.         st->codec->height = get_le32(pb);

  348.         /* not available for asf */

  349.         get_le16(pb); /* panes */

  350.         st->codec->bits_per_coded_sample = get_le16(pb); /* depth */

  351.         tag1 = get_le32(pb);

  352.         url_fskip(pb, 20);

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

  354.         if (sizeX > 40) {

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

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

  357.             get_buffer(pb, st->codec->extradata, st->codec->extradata_size);

  358.         }

  359. 

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

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

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

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

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

  365. #if HAVE_BIGENDIAN

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

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

  368. #else

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

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

  371. #endif

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

  373.         }

  374. 

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

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

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

  378.             st->need_parsing = AVSTREAM_PARSE_FULL;

  379.             // 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

  380.             st->codec->width  =

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

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

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

  384.         }

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

  386.             st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;

  387.     }

  388.     pos2 = url_ftell(pb);

  389.     url_fskip(pb, size - (pos2 - pos1 + 24));

  390. 

  391.     return 0;

  392. }

  393. 

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

  395. {

  396.     ASFContext *asf = s->priv_data;

  397.     ByteIOContext *pb = s->pb;

  398.     ff_asf_guid g;

  399.     int ext_len, payload_ext_ct, stream_ct, i;

  400.     uint32_t ext_d, leak_rate, stream_num;

  401.     unsigned int stream_languageid_index;

  402. 

  403.     get_le64(pb); // starttime

  404.     get_le64(pb); // endtime

  405.     leak_rate = get_le32(pb); // leak-datarate

  406.     get_le32(pb); // bucket-datasize

  407.     get_le32(pb); // init-bucket-fullness

  408.     get_le32(pb); // alt-leak-datarate

  409.     get_le32(pb); // alt-bucket-datasize

  410.     get_le32(pb); // alt-init-bucket-fullness

  411.     get_le32(pb); // max-object-size

  412.     get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)

  413.     stream_num = get_le16(pb); // stream-num

  414. 

  415.     stream_languageid_index = get_le16(pb); // stream-language-id-index

  416.     if (stream_num < 128)

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

  418. 

  419.     get_le64(pb); // avg frametime in 100ns units

  420.     stream_ct = get_le16(pb); //stream-name-count

  421.     payload_ext_ct = get_le16(pb); //payload-extension-system-count

  422. 

  423.     if (stream_num < 128)

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

  425. 

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

  427.         get_le16(pb);

  428.         ext_len = get_le16(pb);

  429.         url_fseek(pb, ext_len, SEEK_CUR);

  430.     }

  431. 

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

  433.         ff_get_guid(pb, &g);

  434.         ext_d=get_le16(pb);

  435.         ext_len=get_le32(pb);

  436.         url_fseek(pb, ext_len, SEEK_CUR);

  437.     }

  438. 

  439.     return 0;

  440. }

  441. 

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

  443. {

  444.     ByteIOContext *pb = s->pb;

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

  446. 

  447.     len1 = get_le16(pb);

  448.     len2 = get_le16(pb);

  449.     len3 = get_le16(pb);

  450.     len4 = get_le16(pb);

  451.     len5 = get_le16(pb);

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

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

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

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

  456.     url_fskip(pb, len5);

  457. 

  458.     return 0;

  459. }

  460. 

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

  462. {

  463.     ByteIOContext *pb = s->pb;

  464.     ASFContext *asf = s->priv_data;

  465.     int desc_count, i, ret;

  466. 

  467.     desc_count = get_le16(pb);

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

  469.         int name_len,value_type,value_len;

  470.         char name[1024];

  471. 

  472.         name_len = get_le16(pb);

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

  474.             name_len += 1;

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

  476.             url_fskip(pb, name_len - ret);

  477.         value_type = get_le16(pb);

  478.         value_len  = get_le16(pb);

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

  480.             value_len += 1;

  481.         /**

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

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

  484.          */

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

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

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

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

  489.         } else

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

  491.     }

  492. 

  493.     return 0;

  494. }

  495. 

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

  497. {

  498.     ByteIOContext *pb = s->pb;

  499.     ASFContext *asf = s->priv_data;

  500.     int j, ret;

  501.     int stream_count = get_le16(pb);

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

  503.         char lang[6];

  504.         unsigned int lang_len = get_byte(pb);

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

  506.             url_fskip(pb, lang_len - ret);

  507.         if (j < 128)

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

  509.     }

  510. 

  511.     return 0;

  512. }

  513. 

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

  515. {

  516.     ByteIOContext *pb = s->pb;

  517.     ASFContext *asf = s->priv_data;

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

  519.     int ret, i;

  520.     n = get_le16(pb);

  521. 

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

  523.         char name[1024];

  524. 

  525.         get_le16(pb); //lang_list_index

  526.         stream_num= get_le16(pb);

  527.         name_len=   get_le16(pb);

  528.         value_type= get_le16(pb);

  529.         value_len=  get_le32(pb);

  530. 

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

  532.             url_fskip(pb, name_len - ret);

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

  534.         value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere

  535.         url_fskip(pb, value_len - 2);

  536. 

  537.         if(stream_num<128){

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

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

  540.         }

  541.     }

  542. 

  543.     return 0;

  544. }

  545. 

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

  547. {

  548.     ByteIOContext *pb = s->pb;

  549.     int i, count, name_len, ret;

  550.     char name[1024];

  551. 

  552.     get_le64(pb);            // reserved 16 bytes

  553.     get_le64(pb);            // ...

  554.     count = get_le32(pb);    // markers count

  555.     get_le16(pb);            // reserved 2 bytes

  556.     name_len = get_le16(pb); // name length

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

  558.         get_byte(pb); // skip the name

  559.     }

  560. 

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

  562.         int64_t pres_time;

  563.         int name_len;

  564. 

  565.         get_le64(pb);             // offset, 8 bytes

  566.         pres_time = get_le64(pb); // presentation time

  567.         get_le16(pb);             // entry length

  568.         get_le32(pb);             // send time

  569.         get_le32(pb);             // flags

  570.         name_len = get_le32(pb);  // name length

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

  572.             url_fskip(pb, name_len - ret);

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

  574.     }

  575. 

  576.     return 0;

  577. }

  578. 

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

  580. {

  581.     ASFContext *asf = s->priv_data;

  582.     ff_asf_guid g;

  583.     ByteIOContext *pb = s->pb;

  584.     int i;

  585.     int64_t gsize;

  586. 

  587.     ff_get_guid(pb, &g);

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

  589.         return -1;

  590.     get_le64(pb);

  591.     get_le32(pb);

  592.     get_byte(pb);

  593.     get_byte(pb);

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

  595.     for(;;) {

  596.         uint64_t gpos= url_ftell(pb);

  597.         ff_get_guid(pb, &g);

  598.         gsize = get_le64(pb);

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

  600.         print_guid(&g);

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

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

  603.             asf->data_object_offset = url_ftell(pb);

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

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

  606.                 asf->data_object_size = gsize - 24;

  607.             } else {

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

  609.             }

  610.             break;

  611.         }

  612.         if (gsize < 24)

  613.             return -1;

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

  615.             asf_read_file_properties(s, gsize);

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

  617.             asf_read_stream_properties(s, gsize);

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

  619.             asf_read_content_desc(s, gsize);

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

  621.             asf_read_language_list(s, gsize);

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

  623.             asf_read_ext_content_desc(s, gsize);

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

  625.             asf_read_metadata(s, gsize);

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

  627.             asf_read_ext_stream_properties(s, gsize);

  628. 

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

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

  631.             continue;

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

  633.             int v1, v2;

  634.             ff_get_guid(pb, &g);

  635.             v1 = get_le32(pb);

  636.             v2 = get_le16(pb);

  637.             continue;

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

  639.             asf_read_marker(s, gsize);

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

  641.             return -1;

  642.         } else {

  643.             if (!s->keylen) {

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

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

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

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

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

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

  650.                 }

  651.             }

  652.         }

  653.         if(url_ftell(pb) != gpos + gsize)

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

  655.         url_fseek(pb, gpos + gsize, SEEK_SET);

  656.     }

  657.     ff_get_guid(pb, &g);

  658.     get_le64(pb);

  659.     get_byte(pb);

  660.     get_byte(pb);

  661.     if (url_feof(pb))

  662.         return -1;

  663.     asf->data_offset = url_ftell(pb);

  664.     asf->packet_size_left = 0;

  665. 

  666. 

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

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

  669.         if(stream_num>=0){

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

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

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

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

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

  675.                           &st->sample_aspect_ratio.den,

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

  677.             } 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.

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

  679.                           &st->sample_aspect_ratio.den,

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

  681. 

  682. //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);

  683. 

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

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

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

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

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

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

  690.                     if (iso6392)

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

  692.                 }

  693.             }

  694.         }

  695.     }

  696. 

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

  698. 

  699.     return 0;

  700. }

  701. 

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

  703.     switch (bits & 3) \

  704.     { \

  705.     case 3: var = get_le32(pb); rsize += 4; break; \

  706.     case 2: var = get_le16(pb); rsize += 2; break; \

  707.     case 1: var = get_byte(pb); rsize++; break; \

  708.     default: var = defval; break; \

  709.     }

  710. 

  711. /**

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

  713.  * @param s demux context

  714.  * @param pb context to read data from

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

  716.  */

  717. static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)

  718. {

  719.     ASFContext *asf = s->priv_data;

  720.     uint32_t packet_length, padsize;

  721.     int rsize = 8;

  722.     int c, d, e, off;

  723. 

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

  725.     off= 32768;

  726.     if (s->packet_size > 0)

  727.         off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;

  728. 

  729.     c=d=e=-1;

  730.     while(off-- > 0){

  731.         c=d; d=e;

  732.         e= get_byte(pb);

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

  734.             break;

  735.     }

  736. 

  737.     if (c != 0x82) {

  738.         /**

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

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

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

  742.          * the stream.

  743.          */

  744.         if (url_ferror(pb) == AVERROR(EAGAIN))

  745.             return AVERROR(EAGAIN);

  746.         if (!url_feof(pb))

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

  748.     }

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

  750.         if (d || e) {

  751.             if (!url_feof(pb))

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

  753.             return -1;

  754.         }

  755.         c= get_byte(pb);

  756.         d= get_byte(pb);

  757.         rsize+=3;

  758.     }else{

  759.         url_fseek(pb, -1, SEEK_CUR); //FIXME

  760.     }

  761. 

  762.     asf->packet_flags    = c;

  763.     asf->packet_property = d;

  764. 

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

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

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

  768. 

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

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

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

  772.         return -1;

  773.     }

  774.     if(padsize >= packet_length){

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

  776.         return -1;

  777.     }

  778. 

  779.     asf->packet_timestamp = get_le32(pb);

  780.     get_le16(pb); /* duration */

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

  782. 

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

  784.         asf->packet_segsizetype = get_byte(pb); rsize++;

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

  786.     } else {

  787.         asf->packet_segments = 1;

  788.         asf->packet_segsizetype = 0x80;

  789.     }

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

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

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

  793.     asf->packet_padsize = padsize;

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

  795.     return 0;

  796. }

  797. 

  798. /**

  799.  *

  800.  * @return <0 if error

  801.  */

  802. static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){

  803.     ASFContext *asf = s->priv_data;

  804.     int rsize = 1;

  805.     int num = get_byte(pb);

  806.     int64_t ts0, ts1;

  807. 

  808.     asf->packet_segments--;

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

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

  811.     // sequence should be ignored!

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

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

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

  815. //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);

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

  817.         asf->packet_obj_size = get_le32(pb);

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

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

  820.             return -1;

  821.         }

  822.         asf->packet_frag_timestamp = get_le32(pb); // timestamp

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

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

  825. //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));

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

  827.             url_fskip(pb, 10);

  828.             ts0= get_le64(pb);

  829.             ts1= get_le64(pb);

  830.             url_fskip(pb, 12);

  831.             get_le32(pb);

  832.             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);

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

  834.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  835.         }else

  836.             url_fskip(pb, asf->packet_replic_size - 8);

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

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

  839.         // multipacket - frag_offset is beginning timestamp

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

  841.         asf->packet_frag_offset = 0;

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

  843. 

  844.         asf->packet_time_delta = get_byte(pb);

  845.         rsize++;

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

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

  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(asf->packet_frag_size > asf->packet_size_left - rsize){

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

  854.             return -1;

  855.         }

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

  857.     } else {

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

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

  860.     }

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

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

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

  864.             return -1;

  865.     }

  866.     asf->packet_size_left -= rsize;

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

  868. 

  869.     return 0;

  870. }

  871. 

  872. /**

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

  874.  * with asf_get_packet()).

  875.  * @param s demux context

  876.  * @param pb context to read data from

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

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

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

  880.  */

  881. static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)

  882. {

  883.     ASFContext *asf = s->priv_data;

  884.     ASFStream *asf_st = 0;

  885.     for (;;) {

  886.         int ret;

  887.         if(url_feof(pb))

  888.             return AVERROR_EOF;

  889.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  894.             assert(ret>=0);

  895.             /* fail safe */

  896.             url_fskip(pb, ret);

  897. 

  898.             asf->packet_pos= url_ftell(pb);

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

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

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

  902.             return 1;

  903.         }

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

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

  906.                 asf->packet_segments= 0;

  907.                 continue;

  908.             }

  909.             if (asf->stream_index < 0

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

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

  912.                 ) {

  913.                 asf->packet_time_start = 0;

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

  915.                 url_fskip(pb, asf->packet_frag_size);

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

  917.                 if(asf->stream_index < 0)

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

  919.                 continue;

  920.             }

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

  922.         }

  923.         asf_st = asf->asf_st;

  924. 

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

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

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

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

  929.             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);

  930.             asf->packet_size_left--;

  931.             asf->packet_multi_size--;

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

  933.             {

  934.                 asf->packet_time_start = 0;

  935.                 url_fskip(pb, asf->packet_multi_size);

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

  937.                 continue;

  938.             }

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

  940.             //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);

  941.         }

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

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

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

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

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

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

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

  949.         }

  950. 

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

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

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

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

  955.                 asf_st->frag_offset = 0;

  956.                 av_free_packet(&asf_st->pkt);

  957.             }

  958.             /* new packet */

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

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

  961.             asf_st->pkt.dts = asf->packet_frag_timestamp;

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

  963.             asf_st->pkt.pos =

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

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

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

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

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

  969.                 asf->packet_key_frame = 1;

  970.             if (asf->packet_key_frame)

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

  972.         }

  973. 

  974.         /* read data */

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

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

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

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

  979.         if (asf->packet_size_left < 0)

  980.             continue;

  981. 

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

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

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

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

  986.             continue;

  987.         }

  988. 

  989.         ret = get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,

  990.                          asf->packet_frag_size);

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

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

  993.                 return ret < 0 ? ret : AVERROR_EOF;

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

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

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

  997.                 // fragment?

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

  999.                        asf->packet_frag_size - ret);

  1000.                 ret = asf->packet_frag_size;

  1001.             } else

  1002.                 // no scrambling, so we can return partial packets

  1003.                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);

  1004.         }

  1005.         if (s->key && s->keylen == 20)

  1006.             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,

  1007.                             ret);

  1008.         asf_st->frag_offset += ret;

  1009.         /* test if whole packet is read */

  1010.         if (asf_st->frag_offset == asf_st->pkt.size) {

  1011.             //workaround for macroshit radio DVR-MS files

  1012.             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO

  1013.                && asf_st->pkt.size > 100){

  1014.                 int i;

  1015.                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);

  1016.                 if(i == asf_st->pkt.size){

  1017.                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");

  1018.                     asf_st->frag_offset = 0;

  1019.                     av_free_packet(&asf_st->pkt);

  1020.                     continue;

  1021.                 }

  1022.             }

  1023. 

  1024.             /* return packet */

  1025.             if (asf_st->ds_span > 1) {

  1026.               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){

  1027.                     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);

  1028.               }else{

  1029.                 /* packet descrambling */

  1030.                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);

  1031.                 if (newdata) {

  1032.                     int offset = 0;

  1033.                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

  1034.                     while (offset < asf_st->pkt.size) {

  1035.                         int off = offset / asf_st->ds_chunk_size;

  1036.                         int row = off / asf_st->ds_span;

  1037.                         int col = off % asf_st->ds_span;

  1038.                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;

  1039.                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);

  1040. 

  1041.                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);

  1042.                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);

  1043.                         memcpy(newdata + offset,

  1044.                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,

  1045.                                asf_st->ds_chunk_size);

  1046.                         offset += asf_st->ds_chunk_size;

  1047.                     }

  1048.                     av_free(asf_st->pkt.data);

  1049.                     asf_st->pkt.data = newdata;

  1050.                 }

  1051.               }

  1052.             }

  1053.             asf_st->frag_offset = 0;

  1054.             *pkt= asf_st->pkt;

  1055.             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);

  1056.             asf_st->pkt.size = 0;

  1057.             asf_st->pkt.data = 0;

  1058.             break; // packet completed

  1059.         }

  1060.     }

  1061.     return 0;

  1062. }

  1063. 

  1064. static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)

  1065. {

  1066.     ASFContext *asf = s->priv_data;

  1067. 

  1068.     for (;;) {

  1069.         int ret;

  1070. 

  1071.         /* parse cached packets, if any */

  1072.         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)

  1073.             return ret;

  1074.         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)

  1075.             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);

  1076.         asf->packet_time_start = 0;

  1077.     }

  1078. 

  1079.     return 0;

  1080. }

  1081. 

  1082. // Added to support seeking after packets have been read

  1083. // If information is not reset, read_packet fails due to

  1084. // leftover information from previous reads

  1085. static void asf_reset_header(AVFormatContext *s)

  1086. {

  1087.     ASFContext *asf = s->priv_data;

  1088.     ASFStream *asf_st;

  1089.     int i;

  1090. 

  1091.     asf->packet_size_left = 0;

  1092.     asf->packet_segments = 0;

  1093.     asf->packet_flags = 0;

  1094.     asf->packet_property = 0;

  1095.     asf->packet_timestamp = 0;

  1096.     asf->packet_segsizetype = 0;

  1097.     asf->packet_segments = 0;

  1098.     asf->packet_seq = 0;

  1099.     asf->packet_replic_size = 0;

  1100.     asf->packet_key_frame = 0;

  1101.     asf->packet_padsize = 0;

  1102.     asf->packet_frag_offset = 0;

  1103.     asf->packet_frag_size = 0;

  1104.     asf->packet_frag_timestamp = 0;

  1105.     asf->packet_multi_size = 0;

  1106.     asf->packet_obj_size = 0;

  1107.     asf->packet_time_delta = 0;

  1108.     asf->packet_time_start = 0;

  1109. 

  1110.     for(i=0; i<s->nb_streams; i++){

  1111.         asf_st= s->streams[i]->priv_data;

  1112.         av_free_packet(&asf_st->pkt);

  1113.         asf_st->frag_offset=0;

  1114.         asf_st->seq=0;

  1115.     }

  1116.     asf->asf_st= NULL;

  1117. }

  1118. 

  1119. static int asf_read_close(AVFormatContext *s)

  1120. {

  1121.     int i;

  1122. 

  1123.     asf_reset_header(s);

  1124.     for(i=0;i<s->nb_streams;i++) {

  1125.         AVStream *st = s->streams[i];

  1126.         av_free(st->codec->palctrl);

  1127.     }

  1128.     return 0;

  1129. }

  1130. 

  1131. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  1132. {

  1133.     AVPacket pkt1, *pkt = &pkt1;

  1134.     ASFStream *asf_st;

  1135.     int64_t pts;

  1136.     int64_t pos= *ppos;

  1137.     int i;

  1138.     int64_t start_pos[ASF_MAX_STREAMS];

  1139. 

  1140.     for(i=0; i<s->nb_streams; i++){

  1141.         start_pos[i]= pos;

  1142.     }

  1143. 

  1144.     if (s->packet_size > 0)

  1145.         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;

  1146.     *ppos= pos;

  1147.     url_fseek(s->pb, pos, SEEK_SET);

  1148. 

  1149. //printf("asf_read_pts\n");

  1150.     asf_reset_header(s);

  1151.     for(;;){

  1152.         if (av_read_frame(s, pkt) < 0){

  1153.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1154.             return AV_NOPTS_VALUE;

  1155.         }

  1156. 

  1157.         pts= pkt->pts;

  1158. 

  1159.         av_free_packet(pkt);

  1160.         if(pkt->flags&AV_PKT_FLAG_KEY){

  1161.             i= pkt->stream_index;

  1162. 

  1163.             asf_st= s->streams[i]->priv_data;

  1164. 

  1165. //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);

  1166.             pos= asf_st->packet_pos;

  1167. 

  1168.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1169.             start_pos[i]= asf_st->packet_pos + 1;

  1170. 

  1171.             if(pkt->stream_index == stream_index)

  1172.                break;

  1173.         }

  1174.     }

  1175. 

  1176.     *ppos= pos;

  1177. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1178. 

  1179.     return pts;

  1180. }

  1181. 

  1182. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1183. {

  1184.     ff_asf_guid g;

  1185.     ASFContext *asf = s->priv_data;

  1186.     int64_t current_pos= url_ftell(s->pb);

  1187.     int i;

  1188. 

  1189.     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);

  1190.     ff_get_guid(s->pb, &g);

  1191. 

  1192.     /* the data object can be followed by other top-level objects,

  1193.        skip them until the simple index object is reached */

  1194.     while (ff_guidcmp(&g, &index_guid)) {

  1195.         int64_t gsize= get_le64(s->pb);

  1196.         if (gsize < 24 || url_feof(s->pb)) {

  1197.             url_fseek(s->pb, current_pos, SEEK_SET);

  1198.             return;

  1199.         }

  1200.         url_fseek(s->pb, gsize-24, SEEK_CUR);

  1201.         ff_get_guid(s->pb, &g);

  1202.     }

  1203. 

  1204.     {

  1205.         int64_t itime, last_pos=-1;

  1206.         int pct, ict;

  1207.         int64_t av_unused gsize= get_le64(s->pb);

  1208.         ff_get_guid(s->pb, &g);

  1209.         itime=get_le64(s->pb);

  1210.         pct=get_le32(s->pb);

  1211.         ict=get_le32(s->pb);

  1212.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1213. 

  1214.         for (i=0;i<ict;i++){

  1215.             int pktnum=get_le32(s->pb);

  1216.             int pktct =get_le16(s->pb);

  1217.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1218.             int64_t index_pts= av_rescale(itime, i, 10000);

  1219. 

  1220.             if(pos != last_pos){

  1221.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);

  1222.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1223.             last_pos=pos;

  1224.             }

  1225.         }

  1226.         asf->index_read= 1;

  1227.     }

  1228.     url_fseek(s->pb, current_pos, SEEK_SET);

  1229. }

  1230. 

  1231. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1232. {

  1233.     ASFContext *asf = s->priv_data;

  1234.     AVStream *st = s->streams[stream_index];

  1235.     int64_t pos;

  1236.     int index;

  1237. 

  1238.     if (s->packet_size <= 0)

  1239.         return -1;

  1240. 

  1241.     /* Try using the protocol's read_seek if available */

  1242.     if(s->pb) {

  1243.         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);

  1244.         if(ret >= 0)

  1245.             asf_reset_header(s);

  1246.         if (ret != AVERROR(ENOSYS))

  1247.             return ret;

  1248.     }

  1249. 

  1250.     if (!asf->index_read)

  1251.         asf_build_simple_index(s, stream_index);

  1252. 

  1253.     if(!(asf->index_read && st->index_entries)){

  1254.         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)

  1255.             return -1;

  1256.     }else{

  1257.         index= av_index_search_timestamp(st, pts, flags);

  1258.         if(index<0)

  1259.             return -1;

  1260. 

  1261.         /* find the position */

  1262.         pos = st->index_entries[index].pos;

  1263. 

  1264.     // various attempts to find key frame have failed so far

  1265.     //    asf_reset_header(s);

  1266.     //    url_fseek(s->pb, pos, SEEK_SET);

  1267.     //    key_pos = pos;

  1268.     //     for(i=0;i<16;i++){

  1269.     //         pos = url_ftell(s->pb);

  1270.     //         if (av_read_frame(s, &pkt) < 0){

  1271.     //             av_log(s, AV_LOG_INFO, "seek failed\n");

  1272.     //             return -1;

  1273.     //         }

  1274.     //         asf_st = s->streams[stream_index]->priv_data;

  1275.     //         pos += st->parser->frame_offset;

  1276.     //

  1277.     //         if (pkt.size > b) {

  1278.     //             b = pkt.size;

  1279.     //             key_pos = pos;

  1280.     //         }

  1281.     //

  1282.     //         av_free_packet(&pkt);

  1283.     //     }

  1284. 

  1285.         /* do the seek */

  1286.         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1287.         url_fseek(s->pb, pos, SEEK_SET);

  1288.     }

  1289.     asf_reset_header(s);

  1290.     return 0;

  1291. }

  1292. 

  1293. AVInputFormat ff_asf_demuxer = {

  1294.     "asf",

  1295.     NULL_IF_CONFIG_SMALL("ASF format"),

  1296.     sizeof(ASFContext),

  1297.     asf_probe,

  1298.     asf_read_header,

  1299.     asf_read_packet,

  1300.     asf_read_close,

  1301.     asf_read_seek,

  1302.     asf_read_pts,

  1303. };