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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 "libavutil/mathematics.h"

  29. #include "libavcodec/mpegaudio.h"

  30. #include "avformat.h"

  31. #include "internal.h"

  32. #include "avio_internal.h"

  33. #include "riff.h"

  34. #include "asf.h"

  35. #include "asfcrypt.h"

  36. #include "avlanguage.h"

  37. 

  38. typedef struct {

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

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

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

  42.     AVRational dar[128];

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

  44.     /* non streamed additonnal info */

  45.     /* packet filling */

  46.     int packet_size_left;

  47.     /* only for reading */

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

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

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

  51.     int index_read;

  52. 

  53.     ASFMainHeader hdr;

  54. 

  55.     int packet_flags;

  56.     int packet_property;

  57.     int packet_timestamp;

  58.     int packet_segsizetype;

  59.     int packet_segments;

  60.     int packet_seq;

  61.     int packet_replic_size;

  62.     int packet_key_frame;

  63.     int packet_padsize;

  64.     unsigned int packet_frag_offset;

  65.     unsigned int packet_frag_size;

  66.     int64_t packet_frag_timestamp;

  67.     int packet_multi_size;

  68.     int packet_obj_size;

  69.     int packet_time_delta;

  70.     int packet_time_start;

  71.     int64_t packet_pos;

  72. 

  73.     int stream_index;

  74. 

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

  76. } ASFContext;

  77. 

  78. #undef NDEBUG

  79. #include <assert.h>

  80. 

  81. #define ASF_MAX_STREAMS 127

  82. #define FRAME_HEADER_SIZE 17

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

  84. 

  85. static const ff_asf_guid index_guid = {

  86.     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb

  87. };

  88. 

  89. #ifdef DEBUG

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

  91.     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2

  92. };

  93. 

  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) { // ASCII

  170.         avio_read(s->pb, value, len);

  171.         value[len]=0;

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

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

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

  175.     } else {

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

  177.         goto finish;

  178.     }

  179.     if (*value)

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

  181. finish:

  182.     av_freep(&value);

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

  184. }

  185. 

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

  187. {

  188.     ASFContext *asf = s->priv_data;

  189.     AVIOContext *pb = s->pb;

  190. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  204. 

  205.     return 0;

  206. }

  207. 

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

  209. {

  210.     ASFContext *asf = s->priv_data;

  211.     AVIOContext *pb = s->pb;

  212.     AVStream *st;

  213.     ASFStream *asf_st;

  214.     ff_asf_guid g;

  215.     enum AVMediaType type;

  216.     int type_specific_size, sizeX;

  217.     unsigned int tag1;

  218.     int64_t pos1, pos2, start_time;

  219.     int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  220. 

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

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

  223.         return AVERROR(EINVAL);

  224.     }

  225. 

  226.     pos1 = avio_tell(pb);

  227. 

  228.     st = avformat_new_stream(s, NULL);

  229.     if (!st)

  230.         return AVERROR(ENOMEM);

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

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

  233.     if (!asf_st)

  234.         return AVERROR(ENOMEM);

  235.     st->priv_data = asf_st;

  236.     start_time = asf->hdr.preroll;

  237. 

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

  239. 

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

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

  242.             (10000000 / 1000) - start_time;

  243.     }

  244.     ff_get_guid(pb, &g);

  245. 

  246.     test_for_ext_stream_audio = 0;

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

  248.         type = AVMEDIA_TYPE_AUDIO;

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

  250.         type = AVMEDIA_TYPE_VIDEO;

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

  252.         type = AVMEDIA_TYPE_VIDEO;

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

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

  255.         type = AVMEDIA_TYPE_DATA;

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

  257.         test_for_ext_stream_audio = 1;

  258.         type = AVMEDIA_TYPE_UNKNOWN;

  259.     } else {

  260.         return -1;

  261.     }

  262.     ff_get_guid(pb, &g);

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

  264.     type_specific_size = avio_rl32(pb);

  265.     avio_rl32(pb);

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

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

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

  269. 

  270.     avio_rl32(pb);

  271. 

  272.     if (test_for_ext_stream_audio) {

  273.         ff_get_guid(pb, &g);

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

  275.             type = AVMEDIA_TYPE_AUDIO;

  276.             is_dvr_ms_audio=1;

  277.             ff_get_guid(pb, &g);

  278.             avio_rl32(pb);

  279.             avio_rl32(pb);

  280.             avio_rl32(pb);

  281.             ff_get_guid(pb, &g);

  282.             avio_rl32(pb);

  283.         }

  284.     }

  285. 

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

  287.     if (type == AVMEDIA_TYPE_AUDIO) {

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

  289.         if (ret < 0)

  290.             return ret;

  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->request_probe= 1;

  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 = avio_tell(pb);

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

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

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

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

  308.             avio_rl16(pb); //ds_data_size

  309.             avio_r8(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 - (avio_tell(pb) - pos1 + 24) >= 51) {

  341.         avio_rl32(pb);

  342.         avio_rl32(pb);

  343.         avio_r8(pb);

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

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

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

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

  348.         /* not available for asf */

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

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

  351.         tag1 = avio_rl32(pb);

  352.         avio_skip(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.             avio_read(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 libavcodec */

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

  364.             int av_unused i;

  365. #if HAVE_BIGENDIAN

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

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

  368. #else

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

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

  371. #endif

  372.             asf_st->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 = avio_tell(pb);

  389.     avio_skip(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.     AVIOContext *pb = s->pb;

  398.     ff_asf_guid g;

  399.     int ext_len, payload_ext_ct, stream_ct, i;

  400.     uint32_t leak_rate, stream_num;

  401.     unsigned int stream_languageid_index;

  402. 

  403.     avio_rl64(pb); // starttime

  404.     avio_rl64(pb); // endtime

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

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

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

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

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

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

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

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

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

  414. 

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

  416.     if (stream_num < 128)

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

  418. 

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

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

  421.     payload_ext_ct = avio_rl16(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.         avio_rl16(pb);

  428.         ext_len = avio_rl16(pb);

  429.         avio_skip(pb, ext_len);

  430.     }

  431. 

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

  433.         ff_get_guid(pb, &g);

  434.         avio_skip(pb, 2);

  435.         ext_len=avio_rl32(pb);

  436.         avio_skip(pb, ext_len);

  437.     }

  438. 

  439.     return 0;

  440. }

  441. 

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

  443. {

  444.     AVIOContext *pb = s->pb;

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

  446. 

  447.     len1 = avio_rl16(pb);

  448.     len2 = avio_rl16(pb);

  449.     len3 = avio_rl16(pb);

  450.     len4 = avio_rl16(pb);

  451.     len5 = avio_rl16(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.     avio_skip(pb, len5);

  457. 

  458.     return 0;

  459. }

  460. 

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

  462. {

  463.     AVIOContext *pb = s->pb;

  464.     ASFContext *asf = s->priv_data;

  465.     int desc_count, i, ret;

  466. 

  467.     desc_count = avio_rl16(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 = avio_rl16(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.             avio_skip(pb, name_len - ret);

  477.         value_type = avio_rl16(pb);

  478.         value_len  = avio_rl16(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.     AVIOContext *pb = s->pb;

  499.     ASFContext *asf = s->priv_data;

  500.     int j, ret;

  501.     int stream_count = avio_rl16(pb);

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

  503.         char lang[6];

  504.         unsigned int lang_len = avio_r8(pb);

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

  506.             avio_skip(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.     AVIOContext *pb = s->pb;

  517.     ASFContext *asf = s->priv_data;

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

  519.     int ret, i;

  520.     n = avio_rl16(pb);

  521. 

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

  523.         char name[1024];

  524. 

  525.         avio_rl16(pb); //lang_list_index

  526.         stream_num= avio_rl16(pb);

  527.         name_len=   avio_rl16(pb);

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

  529.         value_len=  avio_rl32(pb);

  530. 

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

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

  535.         avio_skip(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.     AVIOContext *pb = s->pb;

  549.     int i, count, name_len, ret;

  550.     char name[1024];

  551. 

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

  553.     avio_rl64(pb);            // ...

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

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

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

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

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

  559.     }

  560. 

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

  562.         int64_t pres_time;

  563.         int name_len;

  564. 

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

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

  567.         avio_rl16(pb);             // entry length

  568.         avio_rl32(pb);             // send time

  569.         avio_rl32(pb);             // flags

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

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

  572.             avio_skip(pb, name_len - ret);

  573.         avpriv_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.     AVIOContext *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.     avio_rl64(pb);

  591.     avio_rl32(pb);

  592.     avio_r8(pb);

  593.     avio_r8(pb);

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

  595.     for(;;) {

  596.         uint64_t gpos= avio_tell(pb);

  597.         ff_get_guid(pb, &g);

  598.         gsize = avio_rl64(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 = avio_tell(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.             ff_get_guid(pb, &g);

  634.             avio_skip(pb, 6);

  635.             continue;

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

  637.             asf_read_marker(s, gsize);

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

  639.             return -1;

  640.         } else {

  641.             if (!s->keylen) {

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

  643.                     unsigned int len;

  644.                     AVPacket pkt;

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

  646.                     len= avio_rl32(pb);

  647.                     av_log(s, AV_LOG_DEBUG, "Secret data:\n");

  648.                     av_get_packet(pb, &pkt, len); av_hex_dump_log(s, AV_LOG_DEBUG, pkt.data, pkt.size); av_free_packet(&pkt);

  649.                     len= avio_rl32(pb);

  650.                     get_tag(s, "ASF_Protection_Type", -1, len);

  651.                     len= avio_rl32(pb);

  652.                     get_tag(s, "ASF_Key_ID", -1, len);

  653.                     len= avio_rl32(pb);

  654.                     get_tag(s, "ASF_License_URL", -1, len);

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

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

  657.                     av_dict_set(&s->metadata, "encryption", "ASF Extended Content Encryption", 0);

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

  659.                     av_log(s, AV_LOG_INFO, "Digital signature detected!\n");

  660.                 }

  661.             }

  662.         }

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

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

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

  666.     }

  667.     ff_get_guid(pb, &g);

  668.     avio_rl64(pb);

  669.     avio_r8(pb);

  670.     avio_r8(pb);

  671.     if (url_feof(pb))

  672.         return -1;

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

  674.     asf->packet_size_left = 0;

  675. 

  676. 

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

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

  679.         if(stream_num>=0){

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

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

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

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

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

  685.                           &st->sample_aspect_ratio.den,

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

  687.             } 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.

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

  689.                           &st->sample_aspect_ratio.den,

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

  691. 

  692. //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);

  693. 

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

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

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

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

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

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

  700.                     if (iso6392)

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

  702.                 }

  703.             }

  704.         }

  705.     }

  706. 

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

  708. 

  709.     return 0;

  710. }

  711. 

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

  713.     switch (bits & 3) \

  714.     { \

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

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

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

  718.     default: var = defval; break; \

  719.     }

  720. 

  721. /**

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

  723.  * @param s demux context

  724.  * @param pb context to read data from

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

  726.  */

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

  728. {

  729.     ASFContext *asf = s->priv_data;

  730.     uint32_t packet_length, padsize;

  731.     int rsize = 8;

  732.     int c, d, e, off;

  733. 

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

  735.     off= 32768;

  736.     if (s->packet_size > 0)

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

  738. 

  739.     c=d=e=-1;

  740.     while(off-- > 0){

  741.         c=d; d=e;

  742.         e= avio_r8(pb);

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

  744.             break;

  745.     }

  746. 

  747.     if (c != 0x82) {

  748.         /**

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

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

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

  752.          * the stream.

  753.          */

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

  755.             return AVERROR(EAGAIN);

  756.         if (!url_feof(pb))

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

  758.     }

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

  760.         if (d || e) {

  761.             if (!url_feof(pb))

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

  763.             return -1;

  764.         }

  765.         c= avio_r8(pb);

  766.         d= avio_r8(pb);

  767.         rsize+=3;

  768.     }else if(!url_feof(pb)){

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

  770.     }

  771. 

  772.     asf->packet_flags    = c;

  773.     asf->packet_property = d;

  774. 

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

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

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

  778. 

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

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

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

  782.         return -1;

  783.     }

  784.     if(padsize >= packet_length){

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

  786.         return -1;

  787.     }

  788. 

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

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

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

  792. 

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

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

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

  796.     } else {

  797.         asf->packet_segments = 1;

  798.         asf->packet_segsizetype = 0x80;

  799.     }

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

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

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

  803.     asf->packet_padsize = padsize;

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

  805.     return 0;

  806. }

  807. 

  808. /**

  809.  *

  810.  * @return <0 if error

  811.  */

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

  813.     ASFContext *asf = s->priv_data;

  814.     int rsize = 1;

  815.     int num = avio_r8(pb);

  816.     int64_t ts0, ts1 av_unused;

  817. 

  818.     asf->packet_segments--;

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

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

  821.     // sequence should be ignored!

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

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

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

  825. //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);

  826.     if (rsize+asf->packet_replic_size > asf->packet_size_left) {

  827.         av_log(s, AV_LOG_ERROR, "packet_replic_size %d is invalid\n", asf->packet_replic_size);

  828.         return -1;

  829.     }

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

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

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

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

  834.             return -1;

  835.         }

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

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

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

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

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

  841.             avio_skip(pb, 10);

  842.             ts0= avio_rl64(pb);

  843.             ts1= avio_rl64(pb);

  844.             avio_skip(pb, 12);

  845.             avio_rl32(pb);

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

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

  848.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  849.         }else

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

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

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

  853.         // multipacket - frag_offset is beginning timestamp

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

  855.         asf->packet_frag_offset = 0;

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

  857. 

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

  859.         rsize++;

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

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

  862.         return -1;

  863.     }

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

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

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

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

  868.             return -1;

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

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

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

  872.                 return -1;

  873.             } else {

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

  875.                 asf->packet_size_left += diff;

  876.                 asf->packet_padsize   -= diff;

  877.             }

  878.         }

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

  880.     } else {

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

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

  883.     }

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

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

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

  887.             return -1;

  888.     }

  889.     asf->packet_size_left -= rsize;

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

  891. 

  892.     return 0;

  893. }

  894. 

  895. /**

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

  897.  * with asf_get_packet()).

  898.  * @param s demux context

  899.  * @param pb context to read data from

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

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

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

  903.  */

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

  905. {

  906.     ASFContext *asf = s->priv_data;

  907.     ASFStream *asf_st = 0;

  908.     for (;;) {

  909.         int ret;

  910.         if(url_feof(pb))

  911.             return AVERROR_EOF;

  912.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  917.             assert(ret>=0);

  918.             /* fail safe */

  919.             avio_skip(pb, ret);

  920. 

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

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

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

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

  925.             return 1;

  926.         }

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

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

  929.                 asf->packet_segments= 0;

  930.                 continue;

  931.             }

  932.             if (asf->stream_index < 0

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

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

  935.                 ) {

  936.                 asf->packet_time_start = 0;

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

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

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

  940.                 if(asf->stream_index < 0)

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

  942.                 continue;

  943.             }

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

  945.         }

  946.         asf_st = asf->asf_st;

  947. 

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

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

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

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

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

  953.             asf->packet_size_left--;

  954.             asf->packet_multi_size--;

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

  956.             {

  957.                 asf->packet_time_start = 0;

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

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

  960.                 continue;

  961.             }

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

  963.             //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);

  964.         }

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

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

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

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

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

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

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

  972.         }

  973. 

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

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

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

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

  978.                 asf_st->frag_offset = 0;

  979.                 av_free_packet(&asf_st->pkt);

  980.             }

  981.             /* new packet */

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

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

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

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

  986.             asf_st->pkt.pos =

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

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

  989.                 uint8_t *pal;

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

  991.                                               AVPALETTE_SIZE);

  992.                 if (!pal) {

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

  994.                 } else {

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

  996.                     asf_st->palette_changed = 0;

  997.                 }

  998.             }

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

  1000. //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,

  1001. //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);

  1002.             if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)

  1003.                 asf->packet_key_frame = 1;

  1004.             if (asf->packet_key_frame)

  1005.                 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;

  1006.         }

  1007. 

  1008.         /* read data */

  1009.         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",

  1010.         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,

  1011.         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);

  1012.         asf->packet_size_left -= asf->packet_frag_size;

  1013.         if (asf->packet_size_left < 0)

  1014.             continue;

  1015. 

  1016.         if(   asf->packet_frag_offset >= asf_st->pkt.size

  1017.            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){

  1018.             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",

  1019.                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);

  1020.             continue;

  1021.         }

  1022. 

  1023.         ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,

  1024.                          asf->packet_frag_size);

  1025.         if (ret != asf->packet_frag_size) {

  1026.             if (ret < 0 || asf->packet_frag_offset + ret == 0)

  1027.                 return ret < 0 ? ret : AVERROR_EOF;

  1028.             if (asf_st->ds_span > 1) {

  1029.                 // scrambling, we can either drop it completely or fill the remainder

  1030.                 // TODO: should we fill the whole packet instead of just the current

  1031.                 // fragment?

  1032.                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,

  1033.                        asf->packet_frag_size - ret);

  1034.                 ret = asf->packet_frag_size;

  1035.             } else

  1036.                 // no scrambling, so we can return partial packets

  1037.                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);

  1038.         }

  1039.         if (s->key && s->keylen == 20)

  1040.             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,

  1041.                             ret);

  1042.         asf_st->frag_offset += ret;

  1043.         /* test if whole packet is read */

  1044.         if (asf_st->frag_offset == asf_st->pkt.size) {

  1045.             //workaround for macroshit radio DVR-MS files

  1046.             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO

  1047.                && asf_st->pkt.size > 100){

  1048.                 int i;

  1049.                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);

  1050.                 if(i == asf_st->pkt.size){

  1051.                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");

  1052.                     asf_st->frag_offset = 0;

  1053.                     av_free_packet(&asf_st->pkt);

  1054.                     continue;

  1055.                 }

  1056.             }

  1057. 

  1058.             /* return packet */

  1059.             if (asf_st->ds_span > 1) {

  1060.               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){

  1061.                     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);

  1062.               }else{

  1063.                 /* packet descrambling */

  1064.                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);

  1065.                 if (newdata) {

  1066.                     int offset = 0;

  1067.                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

  1068.                     while (offset < asf_st->pkt.size) {

  1069.                         int off = offset / asf_st->ds_chunk_size;

  1070.                         int row = off / asf_st->ds_span;

  1071.                         int col = off % asf_st->ds_span;

  1072.                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;

  1073.                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);

  1074. 

  1075.                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);

  1076.                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);

  1077.                         memcpy(newdata + offset,

  1078.                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,

  1079.                                asf_st->ds_chunk_size);

  1080.                         offset += asf_st->ds_chunk_size;

  1081.                     }

  1082.                     av_free(asf_st->pkt.data);

  1083.                     asf_st->pkt.data = newdata;

  1084.                 }

  1085.               }

  1086.             }

  1087.             asf_st->frag_offset = 0;

  1088.             *pkt= asf_st->pkt;

  1089.             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);

  1090.             asf_st->pkt.size = 0;

  1091.             asf_st->pkt.data = 0;

  1092.             break; // packet completed

  1093.         }

  1094.     }

  1095.     return 0;

  1096. }

  1097. 

  1098. static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)

  1099. {

  1100.     ASFContext *asf = s->priv_data;

  1101. 

  1102.     for (;;) {

  1103.         int ret;

  1104. 

  1105.         /* parse cached packets, if any */

  1106.         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)

  1107.             return ret;

  1108.         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)

  1109.             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);

  1110.         asf->packet_time_start = 0;

  1111.     }

  1112. }

  1113. 

  1114. // Added to support seeking after packets have been read

  1115. // If information is not reset, read_packet fails due to

  1116. // leftover information from previous reads

  1117. static void asf_reset_header(AVFormatContext *s)

  1118. {

  1119.     ASFContext *asf = s->priv_data;

  1120.     ASFStream *asf_st;

  1121.     int i;

  1122. 

  1123.     asf->packet_size_left = 0;

  1124.     asf->packet_segments = 0;

  1125.     asf->packet_flags = 0;

  1126.     asf->packet_property = 0;

  1127.     asf->packet_timestamp = 0;

  1128.     asf->packet_segsizetype = 0;

  1129.     asf->packet_segments = 0;

  1130.     asf->packet_seq = 0;

  1131.     asf->packet_replic_size = 0;

  1132.     asf->packet_key_frame = 0;

  1133.     asf->packet_padsize = 0;

  1134.     asf->packet_frag_offset = 0;

  1135.     asf->packet_frag_size = 0;

  1136.     asf->packet_frag_timestamp = 0;

  1137.     asf->packet_multi_size = 0;

  1138.     asf->packet_obj_size = 0;

  1139.     asf->packet_time_delta = 0;

  1140.     asf->packet_time_start = 0;

  1141. 

  1142.     for(i=0; i<s->nb_streams; i++){

  1143.         asf_st= s->streams[i]->priv_data;

  1144.         av_free_packet(&asf_st->pkt);

  1145.         asf_st->frag_offset=0;

  1146.         asf_st->seq=0;

  1147.     }

  1148.     asf->asf_st= NULL;

  1149. }

  1150. 

  1151. static int asf_read_close(AVFormatContext *s)

  1152. {

  1153.     asf_reset_header(s);

  1154. 

  1155.     return 0;

  1156. }

  1157. 

  1158. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  1159. {

  1160.     AVPacket pkt1, *pkt = &pkt1;

  1161.     ASFStream *asf_st;

  1162.     int64_t pts;

  1163.     int64_t pos= *ppos;

  1164.     int i;

  1165.     int64_t start_pos[ASF_MAX_STREAMS];

  1166. 

  1167.     for(i=0; i<s->nb_streams; i++){

  1168.         start_pos[i]= pos;

  1169.     }

  1170. 

  1171.     if (s->packet_size > 0)

  1172.         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;

  1173.     *ppos= pos;

  1174.     if (avio_seek(s->pb, pos, SEEK_SET) < 0)

  1175.         return AV_NOPTS_VALUE;

  1176. 

  1177. //printf("asf_read_pts\n");

  1178.     asf_reset_header(s);

  1179.     for(;;){

  1180.         if (av_read_frame(s, pkt) < 0){

  1181.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1182.             return AV_NOPTS_VALUE;

  1183.         }

  1184. 

  1185.         pts = pkt->dts;

  1186. 

  1187.         av_free_packet(pkt);

  1188.         if(pkt->flags&AV_PKT_FLAG_KEY){

  1189.             i= pkt->stream_index;

  1190. 

  1191.             asf_st= s->streams[i]->priv_data;

  1192. 

  1193. //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);

  1194.             pos= asf_st->packet_pos;

  1195. 

  1196.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1197.             start_pos[i]= asf_st->packet_pos + 1;

  1198. 

  1199.             if(pkt->stream_index == stream_index)

  1200.                break;

  1201.         }

  1202.     }

  1203. 

  1204.     *ppos= pos;

  1205. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1206. 

  1207.     return pts;

  1208. }

  1209. 

  1210. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1211. {

  1212.     ff_asf_guid g;

  1213.     ASFContext *asf = s->priv_data;

  1214.     int64_t current_pos= avio_tell(s->pb);

  1215.     int i;

  1216. 

  1217.     if(avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET) < 0) {

  1218.         asf->index_read= -1;

  1219.         return;

  1220.     }

  1221. 

  1222.     ff_get_guid(s->pb, &g);

  1223. 

  1224.     /* the data object can be followed by other top-level objects,

  1225.        skip them until the simple index object is reached */

  1226.     while (ff_guidcmp(&g, &index_guid)) {

  1227.         int64_t gsize= avio_rl64(s->pb);

  1228.         if (gsize < 24 || url_feof(s->pb)) {

  1229.             avio_seek(s->pb, current_pos, SEEK_SET);

  1230.             asf->index_read= -1;

  1231.             return;

  1232.         }

  1233.         avio_skip(s->pb, gsize-24);

  1234.         ff_get_guid(s->pb, &g);

  1235.     }

  1236. 

  1237.     {

  1238.         int64_t itime, last_pos=-1;

  1239.         int pct, ict;

  1240.         int64_t av_unused gsize= avio_rl64(s->pb);

  1241.         ff_get_guid(s->pb, &g);

  1242.         itime=avio_rl64(s->pb);

  1243.         pct=avio_rl32(s->pb);

  1244.         ict=avio_rl32(s->pb);

  1245.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1246. 

  1247.         for (i=0;i<ict;i++){

  1248.             int pktnum=avio_rl32(s->pb);

  1249.             int pktct =avio_rl16(s->pb);

  1250.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1251.             int64_t index_pts= FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);

  1252. 

  1253.             if(pos != last_pos){

  1254.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d  pts: %"PRId64"\n", pktnum, pktct, index_pts);

  1255.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1256.             last_pos=pos;

  1257.             }

  1258.         }

  1259.         asf->index_read= 1;

  1260.     }

  1261.     avio_seek(s->pb, current_pos, SEEK_SET);

  1262. }

  1263. 

  1264. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1265. {

  1266.     ASFContext *asf = s->priv_data;

  1267.     AVStream *st = s->streams[stream_index];

  1268.     int64_t pos;

  1269.     int index;

  1270. 

  1271.     if (s->packet_size <= 0)

  1272.         return -1;

  1273. 

  1274.     /* Try using the protocol's read_seek if available */

  1275.     if(s->pb) {

  1276.         int ret = avio_seek_time(s->pb, stream_index, pts, flags);

  1277.         if(ret >= 0)

  1278.             asf_reset_header(s);

  1279.         if (ret != AVERROR(ENOSYS))

  1280.             return ret;

  1281.     }

  1282. 

  1283.     if (!asf->index_read)

  1284.         asf_build_simple_index(s, stream_index);

  1285. 

  1286.     if((asf->index_read > 0 && st->index_entries)){

  1287.         index= av_index_search_timestamp(st, pts, flags);

  1288.         if(index >= 0) {

  1289.             /* find the position */

  1290.             pos = st->index_entries[index].pos;

  1291. 

  1292.             /* do the seek */

  1293.             av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1294.             if(avio_seek(s->pb, pos, SEEK_SET) < 0)

  1295.                 return -1;

  1296.             asf_reset_header(s);

  1297.             return 0;

  1298.         }

  1299.     }

  1300.     /* no index or seeking by index failed */

  1301.     if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)

  1302.         return -1;

  1303.     asf_reset_header(s);

  1304.     return 0;

  1305. }

  1306. 

  1307. AVInputFormat ff_asf_demuxer = {

  1308.     .name           = "asf",

  1309.     .long_name      = NULL_IF_CONFIG_SMALL("ASF format"),

  1310.     .priv_data_size = sizeof(ASFContext),

  1311.     .read_probe     = asf_probe,

  1312.     .read_header    = asf_read_header,

  1313.     .read_packet    = asf_read_packet,

  1314.     .read_close     = asf_read_close,

  1315.     .read_seek      = asf_read_seek,

  1316.     .read_timestamp = asf_read_pts,

  1317.     .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,

  1318. };