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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 "libavutil/opt.h"

  30. #include "avformat.h"

  31. #include "internal.h"

  32. #include "avio_internal.h"

  33. #include "id3v2.h"

  34. #include "riff.h"

  35. #include "asf.h"

  36. #include "asfcrypt.h"

  37. #include "avlanguage.h"

  38. 

  39. typedef struct {

  40.     const AVClass *class;

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

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

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

  44.     AVRational dar[128];

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

  46.     /* non streamed additonnal info */

  47.     /* packet filling */

  48.     int packet_size_left;

  49.     /* only for reading */

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

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

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

  53.     int index_read;

  54. 

  55.     ASFMainHeader hdr;

  56. 

  57.     int packet_flags;

  58.     int packet_property;

  59.     int packet_timestamp;

  60.     int packet_segsizetype;

  61.     int packet_segments;

  62.     int packet_seq;

  63.     int packet_replic_size;

  64.     int packet_key_frame;

  65.     int packet_padsize;

  66.     unsigned int packet_frag_offset;

  67.     unsigned int packet_frag_size;

  68.     int64_t packet_frag_timestamp;

  69.     int packet_multi_size;

  70.     int packet_obj_size;

  71.     int packet_time_delta;

  72.     int packet_time_start;

  73.     int64_t packet_pos;

  74. 

  75.     int stream_index;

  76. 

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

  78. 

  79.     int no_resync_search;

  80. } ASFContext;

  81. 

  82. static const AVOption options[] = {

  83.     {"no_resync_search", "Don't try to resynchronize by looking for a certain optional start code", offsetof(ASFContext, no_resync_search), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },

  84.     { NULL },

  85. };

  86. 

  87. static const AVClass asf_class = {

  88.     .class_name = "asf demuxer",

  89.     .item_name  = av_default_item_name,

  90.     .option     = options,

  91.     .version    = LIBAVUTIL_VERSION_INT,

  92. };

  93. 

  94. #undef NDEBUG

  95. #include <assert.h>

  96. 

  97. #define ASF_MAX_STREAMS 127

  98. #define FRAME_HEADER_SIZE 16

  99. // Fix Me! FRAME_HEADER_SIZE may be different. (17 is known to be too large)

  100. 

  101. #ifdef DEBUG

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

  103.     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2

  104. };

  105. 

  106. #define PRINT_IF_GUID(g,cmp) \

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

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

  109. 

  110. static void print_guid(const ff_asf_guid *g)

  111. {

  112.     int i;

  113.     PRINT_IF_GUID(g, ff_asf_header);

  114.     else PRINT_IF_GUID(g, ff_asf_file_header);

  115.     else PRINT_IF_GUID(g, ff_asf_stream_header);

  116.     else PRINT_IF_GUID(g, ff_asf_audio_stream);

  117.     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);

  118.     else PRINT_IF_GUID(g, ff_asf_video_stream);

  119.     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);

  120.     else PRINT_IF_GUID(g, ff_asf_command_stream);

  121.     else PRINT_IF_GUID(g, ff_asf_comment_header);

  122.     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);

  123.     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);

  124.     else PRINT_IF_GUID(g, ff_asf_data_header);

  125.     else PRINT_IF_GUID(g, ff_asf_simple_index_header);

  126.     else PRINT_IF_GUID(g, ff_asf_head1_guid);

  127.     else PRINT_IF_GUID(g, ff_asf_head2_guid);

  128.     else PRINT_IF_GUID(g, ff_asf_my_guid);

  129.     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);

  130.     else PRINT_IF_GUID(g, ff_asf_extended_content_header);

  131.     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);

  132.     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);

  133.     else PRINT_IF_GUID(g, ff_asf_metadata_header);

  134.     else PRINT_IF_GUID(g, ff_asf_marker_header);

  135.     else PRINT_IF_GUID(g, stream_bitrate_guid);

  136.     else PRINT_IF_GUID(g, ff_asf_language_guid);

  137.     else

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

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

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

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

  142. }

  143. #undef PRINT_IF_GUID

  144. #else

  145. #define print_guid(g)

  146. #endif

  147. 

  148. static int asf_probe(AVProbeData *pd)

  149. {

  150.     /* check file header */

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

  152.         return AVPROBE_SCORE_MAX;

  153.     else

  154.         return 0;

  155. }

  156. 

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

  158.     switch(type){

  159.         case 2: return avio_rl32(pb);

  160.         case 3: return avio_rl32(pb);

  161.         case 4: return avio_rl64(pb);

  162.         case 5: return avio_rl16(pb);

  163.         default:return INT_MIN;

  164.     }

  165. }

  166. 

  167. /* MSDN claims that this should be "compatible with the ID3 frame, APIC",

  168.  * but in reality this is only loosely similar */

  169. static int asf_read_picture(AVFormatContext *s, int len)

  170. {

  171.     AVPacket pkt = { 0 };

  172.     const CodecMime *mime = ff_id3v2_mime_tags;

  173.     enum  AVCodecID      id = AV_CODEC_ID_NONE;

  174.     char mimetype[64];

  175.     uint8_t  *desc = NULL;

  176.     ASFStream *ast = NULL;

  177.     AVStream   *st = NULL;

  178.     int ret, type, picsize, desc_len;

  179. 

  180.     /* type + picsize + mime + desc */

  181.     if (len < 1 + 4 + 2 + 2) {

  182.         av_log(s, AV_LOG_ERROR, "Invalid attached picture size: %d.\n", len);

  183.         return AVERROR_INVALIDDATA;

  184.     }

  185. 

  186.     /* picture type */

  187.     type = avio_r8(s->pb);

  188.     len--;

  189.     if (type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types) || type < 0) {

  190.         av_log(s, AV_LOG_WARNING, "Unknown attached picture type: %d.\n", type);

  191.         type = 0;

  192.     }

  193. 

  194.     /* picture data size */

  195.     picsize = avio_rl32(s->pb);

  196.     len -= 4;

  197. 

  198.     /* picture MIME type */

  199.     len -= avio_get_str16le(s->pb, len, mimetype, sizeof(mimetype));

  200.     while (mime->id != AV_CODEC_ID_NONE) {

  201.         if (!strncmp(mime->str, mimetype, sizeof(mimetype))) {

  202.             id = mime->id;

  203.             break;

  204.         }

  205.         mime++;

  206.     }

  207.     if (id == AV_CODEC_ID_NONE) {

  208.         av_log(s, AV_LOG_ERROR, "Unknown attached picture mimetype: %s.\n",

  209.                mimetype);

  210.         return 0;

  211.     }

  212. 

  213.     if (picsize >= len) {

  214.         av_log(s, AV_LOG_ERROR, "Invalid attached picture data size: %d >= %d.\n",

  215.                picsize, len);

  216.         return AVERROR_INVALIDDATA;

  217.     }

  218. 

  219.     /* picture description */

  220.     desc_len = (len - picsize) * 2 + 1;

  221.     desc     = av_malloc(desc_len);

  222.     if (!desc)

  223.         return AVERROR(ENOMEM);

  224.     len -= avio_get_str16le(s->pb, len - picsize, desc, desc_len);

  225. 

  226.     ret = av_get_packet(s->pb, &pkt, picsize);

  227.     if (ret < 0)

  228.         goto fail;

  229. 

  230.     st = avformat_new_stream(s, NULL);

  231.     ast = av_mallocz(sizeof(*ast));

  232.     if (!st || !ast) {

  233.         ret = AVERROR(ENOMEM);

  234.         goto fail;

  235.     }

  236.     st->priv_data = ast;

  237. 

  238.     st->disposition      |= AV_DISPOSITION_ATTACHED_PIC;

  239.     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

  240.     st->codec->codec_id   = id;

  241. 

  242.     st->attached_pic      = pkt;

  243.     st->attached_pic.stream_index = st->index;

  244.     st->attached_pic.flags |= AV_PKT_FLAG_KEY;

  245. 

  246.     if (*desc)

  247.         av_dict_set(&st->metadata, "title", desc, AV_DICT_DONT_STRDUP_VAL);

  248.     else

  249.         av_freep(&desc);

  250. 

  251.     av_dict_set(&st->metadata, "comment", ff_id3v2_picture_types[type], 0);

  252. 

  253.     return 0;

  254. 

  255. fail:

  256.     av_freep(&ast);

  257.     av_freep(&desc);

  258.     av_free_packet(&pkt);

  259.     return ret;

  260. }

  261. 

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

  263. {

  264.     char *value;

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

  266. 

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

  268.         return;

  269. 

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

  271.     if (!value)

  272.         goto finish;

  273. 

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

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

  276.     } else if (type == -1) { // ASCII

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

  278.         value[len]=0;

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

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

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

  282.     } else if (type == 1 && !strcmp(key, "WM/Picture")) { // handle cover art

  283.         asf_read_picture(s, len);

  284.         goto finish;

  285.     } else {

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

  287.         goto finish;

  288.     }

  289.     if (*value)

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

  291. finish:

  292.     av_freep(&value);

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

  294. }

  295. 

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

  297. {

  298.     ASFContext *asf = s->priv_data;

  299.     AVIOContext *pb = s->pb;

  300. 

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

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

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

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

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

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

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

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

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

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

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

  312.     if (asf->hdr.min_pktsize >= (1U<<29))

  313.         return AVERROR_INVALIDDATA;

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

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

  316. 

  317.     return 0;

  318. }

  319. 

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

  321. {

  322.     ASFContext *asf = s->priv_data;

  323.     AVIOContext *pb = s->pb;

  324.     AVStream *st;

  325.     ASFStream *asf_st;

  326.     ff_asf_guid g;

  327.     enum AVMediaType type;

  328.     int type_specific_size, sizeX;

  329.     unsigned int tag1;

  330.     int64_t pos1, pos2, start_time;

  331.     int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  332. 

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

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

  335.         return AVERROR(EINVAL);

  336.     }

  337. 

  338.     pos1 = avio_tell(pb);

  339. 

  340.     st = avformat_new_stream(s, NULL);

  341.     if (!st)

  342.         return AVERROR(ENOMEM);

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

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

  345.     if (!asf_st)

  346.         return AVERROR(ENOMEM);

  347.     st->priv_data = asf_st;

  348.     start_time = asf->hdr.preroll;

  349. 

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

  351. 

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

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

  354.             (10000000 / 1000) - start_time;

  355.     }

  356.     ff_get_guid(pb, &g);

  357. 

  358.     test_for_ext_stream_audio = 0;

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

  360.         type = AVMEDIA_TYPE_AUDIO;

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

  362.         type = AVMEDIA_TYPE_VIDEO;

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

  364.         type = AVMEDIA_TYPE_VIDEO;

  365.         st->codec->codec_id = AV_CODEC_ID_MJPEG;

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

  367.         type = AVMEDIA_TYPE_DATA;

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

  369.         test_for_ext_stream_audio = 1;

  370.         type = AVMEDIA_TYPE_UNKNOWN;

  371.     } else {

  372.         return -1;

  373.     }

  374.     ff_get_guid(pb, &g);

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

  376.     type_specific_size = avio_rl32(pb);

  377.     avio_rl32(pb);

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

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

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

  381. 

  382.     avio_rl32(pb);

  383. 

  384.     if (test_for_ext_stream_audio) {

  385.         ff_get_guid(pb, &g);

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

  387.             type = AVMEDIA_TYPE_AUDIO;

  388.             is_dvr_ms_audio=1;

  389.             ff_get_guid(pb, &g);

  390.             avio_rl32(pb);

  391.             avio_rl32(pb);

  392.             avio_rl32(pb);

  393.             ff_get_guid(pb, &g);

  394.             avio_rl32(pb);

  395.         }

  396.     }

  397. 

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

  399.     if (type == AVMEDIA_TYPE_AUDIO) {

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

  401.         if (ret < 0)

  402.             return ret;

  403.         if (is_dvr_ms_audio) {

  404.             // codec_id and codec_tag are unreliable in dvr_ms

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

  406.             st->request_probe= 1;

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

  408.         }

  409.         if (st->codec->codec_id == AV_CODEC_ID_AAC) {

  410.             st->need_parsing = AVSTREAM_PARSE_NONE;

  411.         } else {

  412.             st->need_parsing = AVSTREAM_PARSE_FULL;

  413.         }

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

  415.         pos2 = avio_tell(pb);

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

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

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

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

  420.             avio_rl16(pb); //ds_data_size

  421.             avio_r8(pb);   //ds_silence_data

  422.         }

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

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

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

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

  427.             if (!asf_st->ds_chunk_size

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

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

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

  431.         }

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

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

  434.         avio_rl32(pb);

  435.         avio_rl32(pb);

  436.         avio_r8(pb);

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

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

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

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

  441.         /* not available for asf */

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

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

  444.         tag1 = avio_rl32(pb);

  445.         avio_skip(pb, 20);

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

  447.         if (sizeX > 40) {

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

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

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

  451.         }

  452. 

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

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

  455.         /* This is true for all paletted codecs implemented in libavcodec */

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

  457. #if HAVE_BIGENDIAN

  458.             int i;

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

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

  461. #else

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

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

  464. #endif

  465.             asf_st->palette_changed = 1;

  466.         }

  467. 

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

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

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

  471.             st->need_parsing = AVSTREAM_PARSE_FULL;

  472.             // 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

  473.             st->codec->width  =

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

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

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

  477.         }

  478.         if(st->codec->codec_id == AV_CODEC_ID_H264)

  479.             st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;

  480.     }

  481.     pos2 = avio_tell(pb);

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

  483. 

  484.     return 0;

  485. }

  486. 

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

  488. {

  489.     ASFContext *asf = s->priv_data;

  490.     AVIOContext *pb = s->pb;

  491.     ff_asf_guid g;

  492.     int ext_len, payload_ext_ct, stream_ct, i;

  493.     uint32_t leak_rate, stream_num;

  494.     unsigned int stream_languageid_index;

  495. 

  496.     avio_rl64(pb); // starttime

  497.     avio_rl64(pb); // endtime

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

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

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

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

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

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

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

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

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

  507. 

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

  509.     if (stream_num < 128)

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

  511. 

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

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

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

  515. 

  516.     if (stream_num < 128)

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

  518. 

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

  520.         avio_rl16(pb);

  521.         ext_len = avio_rl16(pb);

  522.         avio_skip(pb, ext_len);

  523.     }

  524. 

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

  526.         ff_get_guid(pb, &g);

  527.         avio_skip(pb, 2);

  528.         ext_len=avio_rl32(pb);

  529.         avio_skip(pb, ext_len);

  530.     }

  531. 

  532.     return 0;

  533. }

  534. 

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

  536. {

  537.     AVIOContext *pb = s->pb;

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

  539. 

  540.     len1 = avio_rl16(pb);

  541.     len2 = avio_rl16(pb);

  542.     len3 = avio_rl16(pb);

  543.     len4 = avio_rl16(pb);

  544.     len5 = avio_rl16(pb);

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

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

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

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

  549.     avio_skip(pb, len5);

  550. 

  551.     return 0;

  552. }

  553. 

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

  555. {

  556.     AVIOContext *pb = s->pb;

  557.     ASFContext *asf = s->priv_data;

  558.     int desc_count, i, ret;

  559. 

  560.     desc_count = avio_rl16(pb);

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

  562.         int name_len,value_type,value_len;

  563.         char name[1024];

  564. 

  565.         name_len = avio_rl16(pb);

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

  567.             name_len += 1;

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

  569.             avio_skip(pb, name_len - ret);

  570.         value_type = avio_rl16(pb);

  571.         value_len  = avio_rl16(pb);

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

  573.             value_len += 1;

  574.         /**

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

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

  577.          */

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

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

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

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

  582.         } else

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

  584.     }

  585. 

  586.     return 0;

  587. }

  588. 

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

  590. {

  591.     AVIOContext *pb = s->pb;

  592.     ASFContext *asf = s->priv_data;

  593.     int j, ret;

  594.     int stream_count = avio_rl16(pb);

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

  596.         char lang[6];

  597.         unsigned int lang_len = avio_r8(pb);

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

  599.             avio_skip(pb, lang_len - ret);

  600.         if (j < 128)

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

  602.     }

  603. 

  604.     return 0;

  605. }

  606. 

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

  608. {

  609.     AVIOContext *pb = s->pb;

  610.     ASFContext *asf = s->priv_data;

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

  612.     int ret, i;

  613.     n = avio_rl16(pb);

  614. 

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

  616.         char name[1024];

  617. 

  618.         avio_rl16(pb); //lang_list_index

  619.         stream_num= avio_rl16(pb);

  620.         name_len=   avio_rl16(pb);

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

  622.         value_len=  avio_rl32(pb);

  623. 

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

  625.             avio_skip(pb, name_len - ret);

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

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

  628.         avio_skip(pb, value_len - 2);

  629. 

  630.         if(stream_num<128){

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

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

  633.         }

  634.     }

  635. 

  636.     return 0;

  637. }

  638. 

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

  640. {

  641.     AVIOContext *pb = s->pb;

  642.     int i, count, name_len, ret;

  643.     char name[1024];

  644. 

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

  646.     avio_rl64(pb);            // ...

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

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

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

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

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

  652.     }

  653. 

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

  655.         int64_t pres_time;

  656.         int name_len;

  657. 

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

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

  660.         avio_rl16(pb);             // entry length

  661.         avio_rl32(pb);             // send time

  662.         avio_rl32(pb);             // flags

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

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

  665.             avio_skip(pb, name_len - ret);

  666.         avpriv_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );

  667.     }

  668. 

  669.     return 0;

  670. }

  671. 

  672. static int asf_read_header(AVFormatContext *s)

  673. {

  674.     ASFContext *asf = s->priv_data;

  675.     ff_asf_guid g;

  676.     AVIOContext *pb = s->pb;

  677.     int i;

  678.     int64_t gsize;

  679. 

  680.     ff_get_guid(pb, &g);

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

  682.         return AVERROR_INVALIDDATA;

  683.     avio_rl64(pb);

  684.     avio_rl32(pb);

  685.     avio_r8(pb);

  686.     avio_r8(pb);

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

  688.     for(;;) {

  689.         uint64_t gpos= avio_tell(pb);

  690.         ff_get_guid(pb, &g);

  691.         gsize = avio_rl64(pb);

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

  693.         print_guid(&g);

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

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

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

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

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

  699.                 asf->data_object_size = gsize - 24;

  700.             } else {

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

  702.             }

  703.             break;

  704.         }

  705.         if (gsize < 24)

  706.             return AVERROR_INVALIDDATA;

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

  708.             int ret = asf_read_file_properties(s, gsize);

  709.             if (ret < 0)

  710.                 return ret;

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

  712.             asf_read_stream_properties(s, gsize);

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

  714.             asf_read_content_desc(s, gsize);

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

  716.             asf_read_language_list(s, gsize);

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

  718.             asf_read_ext_content_desc(s, gsize);

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

  720.             asf_read_metadata(s, gsize);

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

  722.             asf_read_ext_stream_properties(s, gsize);

  723. 

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

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

  726.             continue;

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

  728.             ff_get_guid(pb, &g);

  729.             avio_skip(pb, 6);

  730.             continue;

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

  732.             asf_read_marker(s, gsize);

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

  734.             return AVERROR_EOF;

  735.         } else {

  736.             if (!s->keylen) {

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

  738.                     unsigned int len;

  739.                     AVPacket pkt;

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

  741.                     len= avio_rl32(pb);

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

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

  744.                     len= avio_rl32(pb);

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

  746.                     len= avio_rl32(pb);

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

  748.                     len= avio_rl32(pb);

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

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

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

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

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

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

  755.                 }

  756.             }

  757.         }

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

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

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

  761.     }

  762.     ff_get_guid(pb, &g);

  763.     avio_rl64(pb);

  764.     avio_r8(pb);

  765.     avio_r8(pb);

  766.     if (url_feof(pb))

  767.         return AVERROR_EOF;

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

  769.     asf->packet_size_left = 0;

  770. 

  771. 

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

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

  774.         if(stream_num>=0){

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

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

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

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

  779.                 av_reduce(&st->sample_aspect_ratio.den,

  780.                           &st->sample_aspect_ratio.num,

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

  782.             } 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.

  783.                 av_reduce(&st->sample_aspect_ratio.den,

  784.                           &st->sample_aspect_ratio.num,

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

  786. 

  787. //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);

  788. 

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

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

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

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

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

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

  795.                     if (iso6392)

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

  797.                 }

  798.             }

  799.         }

  800.     }

  801. 

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

  803. 

  804.     return 0;

  805. }

  806. 

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

  808.     switch (bits & 3) \

  809.     { \

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

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

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

  813.     default: var = defval; break; \

  814.     }

  815. 

  816. /**

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

  818.  * @param s demux context

  819.  * @param pb context to read data from

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

  821.  */

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

  823. {

  824.     ASFContext *asf = s->priv_data;

  825.     uint32_t packet_length, padsize;

  826.     int rsize = 8;

  827.     int c, d, e, off;

  828. 

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

  830.     off= 32768;

  831.     if (asf->no_resync_search)

  832.         off = 3;

  833.     else if (s->packet_size > 0)

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

  835. 

  836.     c=d=e=-1;

  837.     while(off-- > 0){

  838.         c=d; d=e;

  839.         e= avio_r8(pb);

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

  841.             break;

  842.     }

  843. 

  844.     if (c != 0x82) {

  845.         /**

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

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

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

  849.          * the stream.

  850.          */

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

  852.             return AVERROR(EAGAIN);

  853.         if (!url_feof(pb))

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

  855.     }

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

  857.         if (d || e) {

  858.             if (!url_feof(pb))

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

  860.             return AVERROR_INVALIDDATA;

  861.         }

  862.         c= avio_r8(pb);

  863.         d= avio_r8(pb);

  864.         rsize+=3;

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

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

  867.     }

  868. 

  869.     asf->packet_flags    = c;

  870.     asf->packet_property = d;

  871. 

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

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

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

  875. 

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

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

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

  879.         return AVERROR_INVALIDDATA;

  880.     }

  881.     if(padsize >= packet_length){

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

  883.         return AVERROR_INVALIDDATA;

  884.     }

  885. 

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

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

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

  889. 

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

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

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

  893.     } else {

  894.         asf->packet_segments = 1;

  895.         asf->packet_segsizetype = 0x80;

  896.     }

  897.     if (rsize > packet_length - padsize) {

  898.         asf->packet_size_left = 0;

  899.         av_log(s, AV_LOG_ERROR,

  900.                "invalid packet header length %d for pktlen %d-%d at %"PRId64"\n",

  901.                rsize, packet_length, padsize, avio_tell(pb));

  902.         return AVERROR_INVALIDDATA;

  903.     }

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

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

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

  907.     asf->packet_padsize = padsize;

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

  909.     return 0;

  910. }

  911. 

  912. /**

  913.  *

  914.  * @return <0 if error

  915.  */

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

  917.     ASFContext *asf = s->priv_data;

  918.     int rsize = 1;

  919.     int num = avio_r8(pb);

  920.     int64_t ts0, ts1 av_unused;

  921. 

  922.     asf->packet_segments--;

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

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

  925.     // sequence should be ignored!

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

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

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

  929. //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);

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

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

  932.         return AVERROR_INVALIDDATA;

  933.     }

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

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

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

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

  938.             return AVERROR_INVALIDDATA;

  939.         }

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

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

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

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

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

  945.             avio_skip(pb, 10);

  946.             ts0= avio_rl64(pb);

  947.             ts1= avio_rl64(pb);

  948.             avio_skip(pb, 12);

  949.             avio_rl32(pb);

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

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

  952.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  953.         }else

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

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

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

  957.         // multipacket - frag_offset is beginning timestamp

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

  959.         asf->packet_frag_offset = 0;

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

  961. 

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

  963.         rsize++;

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

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

  966.         return AVERROR_INVALIDDATA;

  967.     }

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

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

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

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

  972.             return AVERROR_INVALIDDATA;

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

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

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

  976.                 return AVERROR_INVALIDDATA;

  977.             } else {

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

  979.                 asf->packet_size_left += diff;

  980.                 asf->packet_padsize   -= diff;

  981.             }

  982.         }

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

  984.     } else {

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

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

  987.     }

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

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

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

  991.             return AVERROR_INVALIDDATA;

  992.     }

  993.     asf->packet_size_left -= rsize;

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

  995. 

  996.     return 0;

  997. }

  998. 

  999. /**

  1000.  * Parse data from individual ASF packets (which were previously loaded

  1001.  * with asf_get_packet()).

  1002.  * @param s demux context

  1003.  * @param pb context to read data from

  1004.  * @param pkt pointer to store packet data into

  1005.  * @return 0 if data was stored in pkt, <0 on error or 1 if more ASF

  1006.  *          packets need to be loaded (through asf_get_packet())

  1007.  */

  1008. static int ff_asf_parse_packet(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)

  1009. {

  1010.     ASFContext *asf = s->priv_data;

  1011.     ASFStream *asf_st = 0;

  1012.     for (;;) {

  1013.         int ret;

  1014.         if(url_feof(pb))

  1015.             return AVERROR_EOF;

  1016.         if (asf->packet_size_left < FRAME_HEADER_SIZE

  1017.             || asf->packet_segments < 1) {

  1018.             //asf->packet_size_left <= asf->packet_padsize) {

  1019.             int ret = asf->packet_size_left + asf->packet_padsize;

  1020.             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, avio_tell(pb));

  1021.             assert(ret>=0);

  1022.             /* fail safe */

  1023.             avio_skip(pb, ret);

  1024. 

  1025.             asf->packet_pos= avio_tell(pb);

  1026.             if (asf->data_object_size != (uint64_t)-1 &&

  1027.                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))

  1028.                 return AVERROR_EOF; /* Do not exceed the size of the data object */

  1029.             return 1;

  1030.         }

  1031.         if (asf->packet_time_start == 0) {

  1032.             if(asf_read_frame_header(s, pb) < 0){

  1033.                 asf->packet_segments= 0;

  1034.                 continue;

  1035.             }

  1036.             if (asf->stream_index < 0

  1037.                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL

  1038.                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)

  1039.                 ) {

  1040.                 asf->packet_time_start = 0;

  1041.                 /* unhandled packet (should not happen) */

  1042.                 avio_skip(pb, asf->packet_frag_size);

  1043.                 asf->packet_size_left -= asf->packet_frag_size;

  1044.                 if(asf->stream_index < 0)

  1045.                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);

  1046.                 continue;

  1047.             }

  1048.             asf->asf_st = s->streams[asf->stream_index]->priv_data;

  1049.         }

  1050.         asf_st = asf->asf_st;

  1051. 

  1052.         if (asf->packet_replic_size == 1) {

  1053.             // frag_offset is here used as the beginning timestamp

  1054.             asf->packet_frag_timestamp = asf->packet_time_start;

  1055.             asf->packet_time_start += asf->packet_time_delta;

  1056.             asf->packet_obj_size = asf->packet_frag_size = avio_r8(pb);

  1057.             asf->packet_size_left--;

  1058.             asf->packet_multi_size--;

  1059.             if (asf->packet_multi_size < asf->packet_obj_size)

  1060.             {

  1061.                 asf->packet_time_start = 0;

  1062.                 avio_skip(pb, asf->packet_multi_size);

  1063.                 asf->packet_size_left -= asf->packet_multi_size;

  1064.                 continue;

  1065.             }

  1066.             asf->packet_multi_size -= asf->packet_obj_size;

  1067.             //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);

  1068.         }

  1069.         if(   /*asf->packet_frag_size == asf->packet_obj_size*/

  1070.               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size

  1071.            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){

  1072.             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",

  1073.                 asf_st->frag_offset, asf->packet_frag_size,

  1074.                 asf->packet_obj_size, asf_st->pkt.size);

  1075.             asf->packet_obj_size= asf_st->pkt.size;

  1076.         }

  1077. 

  1078.         if (   asf_st->pkt.size != asf->packet_obj_size

  1079.             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?

  1080.             if(asf_st->pkt.data){

  1081.                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);

  1082.                 asf_st->frag_offset = 0;

  1083.                 av_free_packet(&asf_st->pkt);

  1084.             }

  1085.             /* new packet */

  1086.             av_new_packet(&asf_st->pkt, asf->packet_obj_size);

  1087.             asf_st->seq = asf->packet_seq;

  1088.             asf_st->pkt.dts = asf->packet_frag_timestamp - asf->hdr.preroll;

  1089.             asf_st->pkt.stream_index = asf->stream_index;

  1090.             asf_st->pkt.pos =

  1091.             asf_st->packet_pos= asf->packet_pos;

  1092.             if (asf_st->pkt.data && asf_st->palette_changed) {

  1093.                 uint8_t *pal;

  1094.                 pal = av_packet_new_side_data(&asf_st->pkt, AV_PKT_DATA_PALETTE,

  1095.                                               AVPALETTE_SIZE);

  1096.                 if (!pal) {

  1097.                     av_log(s, AV_LOG_ERROR, "Cannot append palette to packet\n");

  1098.                 } else {

  1099.                     memcpy(pal, asf_st->palette, AVPALETTE_SIZE);

  1100.                     asf_st->palette_changed = 0;

  1101.                 }

  1102.             }

  1103. //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",

  1104. //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,

  1105. //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);

  1106.             if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)

  1107.                 asf->packet_key_frame = 1;

  1108.             if (asf->packet_key_frame)

  1109.                 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;

  1110.         }

  1111. 

  1112.         /* read data */

  1113.         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",

  1114.         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,

  1115.         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);

  1116.         asf->packet_size_left -= asf->packet_frag_size;

  1117.         if (asf->packet_size_left < 0)

  1118.             continue;

  1119. 

  1120.         if(   asf->packet_frag_offset >= asf_st->pkt.size

  1121.            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){

  1122.             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",

  1123.                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);

  1124.             continue;

  1125.         }

  1126. 

  1127.         ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,

  1128.                          asf->packet_frag_size);

  1129.         if (ret != asf->packet_frag_size) {

  1130.             if (ret < 0 || asf->packet_frag_offset + ret == 0)

  1131.                 return ret < 0 ? ret : AVERROR_EOF;

  1132.             if (asf_st->ds_span > 1) {

  1133.                 // scrambling, we can either drop it completely or fill the remainder

  1134.                 // TODO: should we fill the whole packet instead of just the current

  1135.                 // fragment?

  1136.                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,

  1137.                        asf->packet_frag_size - ret);

  1138.                 ret = asf->packet_frag_size;

  1139.             } else

  1140.                 // no scrambling, so we can return partial packets

  1141.                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);

  1142.         }

  1143.         if (s->key && s->keylen == 20)

  1144.             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,

  1145.                             ret);

  1146.         asf_st->frag_offset += ret;

  1147.         /* test if whole packet is read */

  1148.         if (asf_st->frag_offset == asf_st->pkt.size) {

  1149.             //workaround for macroshit radio DVR-MS files

  1150.             if(   s->streams[asf->stream_index]->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO

  1151.                && asf_st->pkt.size > 100){

  1152.                 int i;

  1153.                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);

  1154.                 if(i == asf_st->pkt.size){

  1155.                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");

  1156.                     asf_st->frag_offset = 0;

  1157.                     av_free_packet(&asf_st->pkt);

  1158.                     continue;

  1159.                 }

  1160.             }

  1161. 

  1162.             /* return packet */

  1163.             if (asf_st->ds_span > 1) {

  1164.               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){

  1165.                     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);

  1166.               }else{

  1167.                 /* packet descrambling */

  1168.                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);

  1169.                 if (newdata) {

  1170.                     int offset = 0;

  1171.                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

  1172.                     while (offset < asf_st->pkt.size) {

  1173.                         int off = offset / asf_st->ds_chunk_size;

  1174.                         int row = off / asf_st->ds_span;

  1175.                         int col = off % asf_st->ds_span;

  1176.                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;

  1177.                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);

  1178. 

  1179.                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);

  1180.                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);

  1181.                         memcpy(newdata + offset,

  1182.                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,

  1183.                                asf_st->ds_chunk_size);

  1184.                         offset += asf_st->ds_chunk_size;

  1185.                     }

  1186.                     av_free(asf_st->pkt.data);

  1187.                     asf_st->pkt.data = newdata;

  1188.                 }

  1189.               }

  1190.             }

  1191.             asf_st->frag_offset = 0;

  1192.             *pkt= asf_st->pkt;

  1193.             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);

  1194.             asf_st->pkt.size = 0;

  1195.             asf_st->pkt.data = 0;

  1196.             asf_st->pkt.side_data_elems = 0;

  1197.             asf_st->pkt.side_data = NULL;

  1198.             break; // packet completed

  1199.         }

  1200.     }

  1201.     return 0;

  1202. }

  1203. 

  1204. static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)

  1205. {

  1206.     ASFContext *asf = s->priv_data;

  1207. 

  1208.     for (;;) {

  1209.         int ret;

  1210. 

  1211.         /* parse cached packets, if any */

  1212.         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)

  1213.             return ret;

  1214.         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)

  1215.             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);

  1216.         asf->packet_time_start = 0;

  1217.     }

  1218. }

  1219. 

  1220. // Added to support seeking after packets have been read

  1221. // If information is not reset, read_packet fails due to

  1222. // leftover information from previous reads

  1223. static void asf_reset_header(AVFormatContext *s)

  1224. {

  1225.     ASFContext *asf = s->priv_data;

  1226.     ASFStream *asf_st;

  1227.     int i;

  1228. 

  1229.     asf->packet_size_left = 0;

  1230.     asf->packet_segments = 0;

  1231.     asf->packet_flags = 0;

  1232.     asf->packet_property = 0;

  1233.     asf->packet_timestamp = 0;

  1234.     asf->packet_segsizetype = 0;

  1235.     asf->packet_segments = 0;

  1236.     asf->packet_seq = 0;

  1237.     asf->packet_replic_size = 0;

  1238.     asf->packet_key_frame = 0;

  1239.     asf->packet_padsize = 0;

  1240.     asf->packet_frag_offset = 0;

  1241.     asf->packet_frag_size = 0;

  1242.     asf->packet_frag_timestamp = 0;

  1243.     asf->packet_multi_size = 0;

  1244.     asf->packet_obj_size = 0;

  1245.     asf->packet_time_delta = 0;

  1246.     asf->packet_time_start = 0;

  1247. 

  1248.     for(i=0; i<s->nb_streams; i++){

  1249.         asf_st= s->streams[i]->priv_data;

  1250.         av_free_packet(&asf_st->pkt);

  1251.         asf_st->frag_offset=0;

  1252.         asf_st->seq=0;

  1253.     }

  1254.     asf->asf_st= NULL;

  1255. }

  1256. 

  1257. static int asf_read_close(AVFormatContext *s)

  1258. {

  1259.     asf_reset_header(s);

  1260. 

  1261.     return 0;

  1262. }

  1263. 

  1264. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  1265. {

  1266.     AVPacket pkt1, *pkt = &pkt1;

  1267.     ASFStream *asf_st;

  1268.     int64_t pts;

  1269.     int64_t pos= *ppos;

  1270.     int i;

  1271.     int64_t start_pos[ASF_MAX_STREAMS];

  1272. 

  1273.     for(i=0; i<s->nb_streams; i++){

  1274.         start_pos[i]= pos;

  1275.     }

  1276. 

  1277.     if (s->packet_size > 0)

  1278.         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;

  1279.     *ppos= pos;

  1280.     if (avio_seek(s->pb, pos, SEEK_SET) < 0)

  1281.         return AV_NOPTS_VALUE;

  1282. 

  1283. //printf("asf_read_pts\n");

  1284.     asf_reset_header(s);

  1285.     for(;;){

  1286.         if (av_read_frame(s, pkt) < 0){

  1287.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1288.             return AV_NOPTS_VALUE;

  1289.         }

  1290. 

  1291.         pts = pkt->dts;

  1292. 

  1293.         av_free_packet(pkt);

  1294.         if(pkt->flags&AV_PKT_FLAG_KEY){

  1295.             i= pkt->stream_index;

  1296. 

  1297.             asf_st= s->streams[i]->priv_data;

  1298. 

  1299. //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);

  1300.             pos= asf_st->packet_pos;

  1301. 

  1302.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1303.             start_pos[i]= asf_st->packet_pos + 1;

  1304. 

  1305.             if(pkt->stream_index == stream_index)

  1306.                break;

  1307.         }

  1308.     }

  1309. 

  1310.     *ppos= pos;

  1311. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1312. 

  1313.     return pts;

  1314. }

  1315. 

  1316. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1317. {

  1318.     ff_asf_guid g;

  1319.     ASFContext *asf = s->priv_data;

  1320.     int64_t current_pos= avio_tell(s->pb);

  1321. 

  1322.     if(avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET) < 0) {

  1323.         asf->index_read= -1;

  1324.         return;

  1325.     }

  1326. 

  1327.     ff_get_guid(s->pb, &g);

  1328. 

  1329.     /* the data object can be followed by other top-level objects,

  1330.        skip them until the simple index object is reached */

  1331.     while (ff_guidcmp(&g, &ff_asf_simple_index_header)) {

  1332.         int64_t gsize= avio_rl64(s->pb);

  1333.         if (gsize < 24 || url_feof(s->pb)) {

  1334.             avio_seek(s->pb, current_pos, SEEK_SET);

  1335.             asf->index_read= -1;

  1336.             return;

  1337.         }

  1338.         avio_skip(s->pb, gsize-24);

  1339.         ff_get_guid(s->pb, &g);

  1340.     }

  1341. 

  1342.     {

  1343.         int64_t itime, last_pos=-1;

  1344.         int pct, ict;

  1345.         int i;

  1346.         int64_t av_unused gsize= avio_rl64(s->pb);

  1347.         ff_get_guid(s->pb, &g);

  1348.         itime=avio_rl64(s->pb);

  1349.         pct=avio_rl32(s->pb);

  1350.         ict=avio_rl32(s->pb);

  1351.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1352. 

  1353.         for (i=0;i<ict;i++){

  1354.             int pktnum=avio_rl32(s->pb);

  1355.             int pktct =avio_rl16(s->pb);

  1356.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1357.             int64_t index_pts= FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);

  1358. 

  1359.             if(pos != last_pos){

  1360.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d  pts: %"PRId64"\n", pktnum, pktct, index_pts);

  1361.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1362.             last_pos=pos;

  1363.             }

  1364.         }

  1365.         asf->index_read= ict > 1;

  1366.     }

  1367.     avio_seek(s->pb, current_pos, SEEK_SET);

  1368. }

  1369. 

  1370. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1371. {

  1372.     ASFContext *asf = s->priv_data;

  1373.     AVStream *st = s->streams[stream_index];

  1374. 

  1375.     if (s->packet_size <= 0)

  1376.         return -1;

  1377. 

  1378.     /* Try using the protocol's read_seek if available */

  1379.     if(s->pb) {

  1380.         int ret = avio_seek_time(s->pb, stream_index, pts, flags);

  1381.         if(ret >= 0)

  1382.             asf_reset_header(s);

  1383.         if (ret != AVERROR(ENOSYS))

  1384.             return ret;

  1385.     }

  1386. 

  1387.     if (!asf->index_read)

  1388.         asf_build_simple_index(s, stream_index);

  1389. 

  1390.     if((asf->index_read > 0 && st->index_entries)){

  1391.         int index= av_index_search_timestamp(st, pts, flags);

  1392.         if(index >= 0) {

  1393.             /* find the position */

  1394.             uint64_t pos = st->index_entries[index].pos;

  1395. 

  1396.             /* do the seek */

  1397.             av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1398.             if(avio_seek(s->pb, pos, SEEK_SET) < 0)

  1399.                 return -1;

  1400.             asf_reset_header(s);

  1401.             return 0;

  1402.         }

  1403.     }

  1404.     /* no index or seeking by index failed */

  1405.     if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)

  1406.         return -1;

  1407.     asf_reset_header(s);

  1408.     return 0;

  1409. }

  1410. 

  1411. AVInputFormat ff_asf_demuxer = {

  1412.     .name           = "asf",

  1413.     .long_name      = NULL_IF_CONFIG_SMALL("ASF (Advanced / Active Streaming Format)"),

  1414.     .priv_data_size = sizeof(ASFContext),

  1415.     .read_probe     = asf_probe,

  1416.     .read_header    = asf_read_header,

  1417.     .read_packet    = asf_read_packet,

  1418.     .read_close     = asf_read_close,

  1419.     .read_seek      = asf_read_seek,

  1420.     .read_timestamp = asf_read_pts,

  1421.     .flags          = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,

  1422.     .priv_class     = &asf_class,

  1423. };