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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/attributes.h"

  25. #include "libavutil/bswap.h"

  26. #include "libavutil/common.h"

  27. #include "libavutil/avstring.h"

  28. #include "libavutil/dict.h"

  29. #include "libavutil/mathematics.h"

  30. #include "libavutil/opt.h"

  31. #include "avformat.h"

  32. #include "internal.h"

  33. #include "avio_internal.h"

  34. #include "id3v2.h"

  35. #include "riff.h"

  36. #include "asf.h"

  37. #include "asfcrypt.h"

  38. #include "avlanguage.h"

  39. 

  40. typedef struct {

  41.     const AVClass *class;

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

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

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

  45.     AVRational dar[128];

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

  47.     /* non streamed additonnal info */

  48.     /* packet filling */

  49.     int packet_size_left;

  50.     /* only for reading */

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

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

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

  54.     int index_read;

  55. 

  56.     ASFMainHeader hdr;

  57. 

  58.     int packet_flags;

  59.     int packet_property;

  60.     int packet_timestamp;

  61.     int packet_segsizetype;

  62.     int packet_segments;

  63.     int packet_seq;

  64.     int packet_replic_size;

  65.     int packet_key_frame;

  66.     int packet_padsize;

  67.     unsigned int packet_frag_offset;

  68.     unsigned int packet_frag_size;

  69.     int64_t packet_frag_timestamp;

  70.     int packet_multi_size;

  71.     int packet_obj_size;

  72.     int packet_time_delta;

  73.     int packet_time_start;

  74.     int64_t packet_pos;

  75. 

  76.     int stream_index;

  77. 

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

  79. 

  80.     int no_resync_search;

  81. } ASFContext;

  82. 

  83. static const AVOption options[] = {

  84.     {"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 },

  85.     { NULL },

  86. };

  87. 

  88. static const AVClass asf_class = {

  89.     .class_name = "asf demuxer",

  90.     .item_name  = av_default_item_name,

  91.     .option     = options,

  92.     .version    = LIBAVUTIL_VERSION_INT,

  93. };

  94. 

  95. #undef NDEBUG

  96. #include <assert.h>

  97. 

  98. #define ASF_MAX_STREAMS 127

  99. #define FRAME_HEADER_SIZE 16

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

  101. 

  102. #ifdef DEBUG

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

  104.     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2

  105. };

  106. 

  107. #define PRINT_IF_GUID(g,cmp) \

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

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

  110. 

  111. static void print_guid(const ff_asf_guid *g)

  112. {

  113.     int i;

  114.     PRINT_IF_GUID(g, ff_asf_header);

  115.     else PRINT_IF_GUID(g, ff_asf_file_header);

  116.     else PRINT_IF_GUID(g, ff_asf_stream_header);

  117.     else PRINT_IF_GUID(g, ff_asf_audio_stream);

  118.     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);

  119.     else PRINT_IF_GUID(g, ff_asf_video_stream);

  120.     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);

  121.     else PRINT_IF_GUID(g, ff_asf_command_stream);

  122.     else PRINT_IF_GUID(g, ff_asf_comment_header);

  123.     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);

  124.     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);

  125.     else PRINT_IF_GUID(g, ff_asf_data_header);

  126.     else PRINT_IF_GUID(g, ff_asf_simple_index_header);

  127.     else PRINT_IF_GUID(g, ff_asf_head1_guid);

  128.     else PRINT_IF_GUID(g, ff_asf_head2_guid);

  129.     else PRINT_IF_GUID(g, ff_asf_my_guid);

  130.     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);

  131.     else PRINT_IF_GUID(g, ff_asf_extended_content_header);

  132.     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);

  133.     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);

  134.     else PRINT_IF_GUID(g, ff_asf_metadata_header);

  135.     else PRINT_IF_GUID(g, ff_asf_marker_header);

  136.     else PRINT_IF_GUID(g, stream_bitrate_guid);

  137.     else PRINT_IF_GUID(g, ff_asf_language_guid);

  138.     else

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

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

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

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

  143. }

  144. #undef PRINT_IF_GUID

  145. #else

  146. #define print_guid(g)

  147. #endif

  148. 

  149. static int asf_probe(AVProbeData *pd)

  150. {

  151.     /* check file header */

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

  153.         return AVPROBE_SCORE_MAX;

  154.     else

  155.         return 0;

  156. }

  157. 

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

  159.     switch(type){

  160.         case 2: return avio_rl32(pb);

  161.         case 3: return avio_rl32(pb);

  162.         case 4: return avio_rl64(pb);

  163.         case 5: return avio_rl16(pb);

  164.         default:return INT_MIN;

  165.     }

  166. }

  167. 

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

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

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

  171. {

  172.     AVPacket pkt = { 0 };

  173.     const CodecMime *mime = ff_id3v2_mime_tags;

  174.     enum  AVCodecID      id = AV_CODEC_ID_NONE;

  175.     char mimetype[64];

  176.     uint8_t  *desc = NULL;

  177.     ASFStream *ast = NULL;

  178.     AVStream   *st = NULL;

  179.     int ret, type, picsize, desc_len;

  180. 

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

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

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

  184.         return AVERROR_INVALIDDATA;

  185.     }

  186. 

  187.     /* picture type */

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

  189.     len--;

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

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

  192.         type = 0;

  193.     }

  194. 

  195.     /* picture data size */

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

  197.     len -= 4;

  198. 

  199.     /* picture MIME type */

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

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

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

  203.             id = mime->id;

  204.             break;

  205.         }

  206.         mime++;

  207.     }

  208.     if (id == AV_CODEC_ID_NONE) {

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

  210.                mimetype);

  211.         return 0;

  212.     }

  213. 

  214.     if (picsize >= len) {

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

  216.                picsize, len);

  217.         return AVERROR_INVALIDDATA;

  218.     }

  219. 

  220.     /* picture description */

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

  222.     desc     = av_malloc(desc_len);

  223.     if (!desc)

  224.         return AVERROR(ENOMEM);

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

  226. 

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

  228.     if (ret < 0)

  229.         goto fail;

  230. 

  231.     st = avformat_new_stream(s, NULL);

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

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

  234.         ret = AVERROR(ENOMEM);

  235.         goto fail;

  236.     }

  237.     st->priv_data = ast;

  238. 

  239.     st->disposition      |= AV_DISPOSITION_ATTACHED_PIC;

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

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

  242. 

  243.     st->attached_pic      = pkt;

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

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

  246. 

  247.     if (*desc)

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

  249.     else

  250.         av_freep(&desc);

  251. 

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

  253. 

  254.     return 0;

  255. 

  256. fail:

  257.     av_freep(&ast);

  258.     av_freep(&desc);

  259.     av_free_packet(&pkt);

  260.     return ret;

  261. }

  262. 

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

  264. {

  265.     char *value;

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

  267. 

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

  269.         return;

  270. 

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

  272.     if (!value)

  273.         goto finish;

  274. 

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

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

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

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

  279.         value[len]=0;

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

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

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

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

  284.         asf_read_picture(s, len);

  285.         goto finish;

  286.     } else {

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

  288.         goto finish;

  289.     }

  290.     if (*value)

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

  292. finish:

  293.     av_freep(&value);

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

  295. }

  296. 

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

  298. {

  299.     ASFContext *asf = s->priv_data;

  300.     AVIOContext *pb = s->pb;

  301. 

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

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

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

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

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

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

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

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

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

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

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

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

  314.         return AVERROR_INVALIDDATA;

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

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

  317. 

  318.     return 0;

  319. }

  320. 

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

  322. {

  323.     ASFContext *asf = s->priv_data;

  324.     AVIOContext *pb = s->pb;

  325.     AVStream *st;

  326.     ASFStream *asf_st;

  327.     ff_asf_guid g;

  328.     enum AVMediaType type;

  329.     int type_specific_size, sizeX;

  330.     unsigned int tag1;

  331.     int64_t pos1, pos2, start_time;

  332.     int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  333. 

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

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

  336.         return AVERROR(EINVAL);

  337.     }

  338. 

  339.     pos1 = avio_tell(pb);

  340. 

  341.     st = avformat_new_stream(s, NULL);

  342.     if (!st)

  343.         return AVERROR(ENOMEM);

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

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

  346.     if (!asf_st)

  347.         return AVERROR(ENOMEM);

  348.     st->priv_data = asf_st;

  349.     start_time = asf->hdr.preroll;

  350. 

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

  352. 

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

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

  355.             (10000000 / 1000) - start_time;

  356.     }

  357.     ff_get_guid(pb, &g);

  358. 

  359.     test_for_ext_stream_audio = 0;

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

  361.         type = AVMEDIA_TYPE_AUDIO;

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

  363.         type = AVMEDIA_TYPE_VIDEO;

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

  365.         type = AVMEDIA_TYPE_VIDEO;

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

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

  368.         type = AVMEDIA_TYPE_DATA;

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

  370.         test_for_ext_stream_audio = 1;

  371.         type = AVMEDIA_TYPE_UNKNOWN;

  372.     } else {

  373.         return -1;

  374.     }

  375.     ff_get_guid(pb, &g);

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

  377.     type_specific_size = avio_rl32(pb);

  378.     avio_rl32(pb);

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

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

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

  382. 

  383.     avio_rl32(pb);

  384. 

  385.     if (test_for_ext_stream_audio) {

  386.         ff_get_guid(pb, &g);

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

  388.             type = AVMEDIA_TYPE_AUDIO;

  389.             is_dvr_ms_audio=1;

  390.             ff_get_guid(pb, &g);

  391.             avio_rl32(pb);

  392.             avio_rl32(pb);

  393.             avio_rl32(pb);

  394.             ff_get_guid(pb, &g);

  395.             avio_rl32(pb);

  396.         }

  397.     }

  398. 

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

  400.     if (type == AVMEDIA_TYPE_AUDIO) {

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

  402.         if (ret < 0)

  403.             return ret;

  404.         if (is_dvr_ms_audio) {

  405.             // codec_id and codec_tag are unreliable in dvr_ms

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

  407.             st->request_probe= 1;

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

  409.         }

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

  411.             st->need_parsing = AVSTREAM_PARSE_NONE;

  412.         } else {

  413.             st->need_parsing = AVSTREAM_PARSE_FULL;

  414.         }

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

  416.         pos2 = avio_tell(pb);

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

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

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

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

  421.             avio_rl16(pb); //ds_data_size

  422.             avio_r8(pb);   //ds_silence_data

  423.         }

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

  425.             if (!asf_st->ds_chunk_size

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

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

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

  429.         }

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

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

  432.         avio_rl32(pb);

  433.         avio_rl32(pb);

  434.         avio_r8(pb);

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

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

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

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

  439.         /* not available for asf */

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

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

  442.         tag1 = avio_rl32(pb);

  443.         avio_skip(pb, 20);

  444.         if (sizeX > 40) {

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

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

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

  448.         }

  449. 

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

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

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

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

  454. #if HAVE_BIGENDIAN

  455.             int i;

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

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

  458. #else

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

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

  461. #endif

  462.             asf_st->palette_changed = 1;

  463.         }

  464. 

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

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

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

  468.             st->need_parsing = AVSTREAM_PARSE_FULL;

  469.             // 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

  470.             st->codec->width  =

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

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

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

  474.         }

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

  476.             st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;

  477.     }

  478.     pos2 = avio_tell(pb);

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

  480. 

  481.     return 0;

  482. }

  483. 

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

  485. {

  486.     ASFContext *asf = s->priv_data;

  487.     AVIOContext *pb = s->pb;

  488.     ff_asf_guid g;

  489.     int ext_len, payload_ext_ct, stream_ct, i;

  490.     uint32_t leak_rate, stream_num;

  491.     unsigned int stream_languageid_index;

  492. 

  493.     avio_rl64(pb); // starttime

  494.     avio_rl64(pb); // endtime

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

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

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

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

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

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

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

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

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

  504. 

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

  506.     if (stream_num < 128)

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

  508. 

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

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

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

  512. 

  513.     if (stream_num < 128)

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

  515. 

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

  517.         avio_rl16(pb);

  518.         ext_len = avio_rl16(pb);

  519.         avio_skip(pb, ext_len);

  520.     }

  521. 

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

  523.         ff_get_guid(pb, &g);

  524.         avio_skip(pb, 2);

  525.         ext_len=avio_rl32(pb);

  526.         avio_skip(pb, ext_len);

  527.     }

  528. 

  529.     return 0;

  530. }

  531. 

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

  533. {

  534.     AVIOContext *pb = s->pb;

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

  536. 

  537.     len1 = avio_rl16(pb);

  538.     len2 = avio_rl16(pb);

  539.     len3 = avio_rl16(pb);

  540.     len4 = avio_rl16(pb);

  541.     len5 = avio_rl16(pb);

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

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

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

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

  546.     avio_skip(pb, len5);

  547. 

  548.     return 0;

  549. }

  550. 

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

  552. {

  553.     AVIOContext *pb = s->pb;

  554.     ASFContext *asf = s->priv_data;

  555.     int desc_count, i, ret;

  556. 

  557.     desc_count = avio_rl16(pb);

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

  559.         int name_len,value_type,value_len;

  560.         char name[1024];

  561. 

  562.         name_len = avio_rl16(pb);

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

  564.             name_len += 1;

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

  566.             avio_skip(pb, name_len - ret);

  567.         value_type = avio_rl16(pb);

  568.         value_len  = avio_rl16(pb);

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

  570.             value_len += 1;

  571.         /**

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

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

  574.          */

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

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

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

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

  579.         } else

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

  581.     }

  582. 

  583.     return 0;

  584. }

  585. 

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

  587. {

  588.     AVIOContext *pb = s->pb;

  589.     ASFContext *asf = s->priv_data;

  590.     int j, ret;

  591.     int stream_count = avio_rl16(pb);

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

  593.         char lang[6];

  594.         unsigned int lang_len = avio_r8(pb);

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

  596.             avio_skip(pb, lang_len - ret);

  597.         if (j < 128)

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

  599.     }

  600. 

  601.     return 0;

  602. }

  603. 

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

  605. {

  606.     AVIOContext *pb = s->pb;

  607.     ASFContext *asf = s->priv_data;

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

  609.     int ret, i;

  610.     n = avio_rl16(pb);

  611. 

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

  613.         char name[1024];

  614.         int av_unused value_type;

  615. 

  616.         avio_rl16(pb); //lang_list_index

  617.         stream_num= avio_rl16(pb);

  618.         name_len=   avio_rl16(pb);

  619.         value_type = avio_rl16(pb); /* value_type */

  620.         value_len=  avio_rl32(pb);

  621. 

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

  623.             avio_skip(pb, name_len - ret);

  624.         av_dlog(s, "%d %d %d %d %d <%s>\n",

  625.                 i, stream_num, name_len, value_type, value_len, name);

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

  627.         avio_skip(pb, value_len - 2);

  628. 

  629.         if(stream_num<128){

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

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

  632.         }

  633.     }

  634. 

  635.     return 0;

  636. }

  637. 

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

  639. {

  640.     AVIOContext *pb = s->pb;

  641.     int i, count, name_len, ret;

  642.     char name[1024];

  643. 

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

  645.     avio_rl64(pb);            // ...

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

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

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

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

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

  651.     }

  652. 

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

  654.         int64_t pres_time;

  655.         int name_len;

  656. 

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

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

  659.         avio_rl16(pb);             // entry length

  660.         avio_rl32(pb);             // send time

  661.         avio_rl32(pb);             // flags

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

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

  664.             avio_skip(pb, name_len - ret);

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

  666.     }

  667. 

  668.     return 0;

  669. }

  670. 

  671. static int asf_read_header(AVFormatContext *s)

  672. {

  673.     ASFContext *asf = s->priv_data;

  674.     ff_asf_guid g;

  675.     AVIOContext *pb = s->pb;

  676.     int i;

  677.     int64_t gsize;

  678. 

  679.     ff_get_guid(pb, &g);

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

  681.         return AVERROR_INVALIDDATA;

  682.     avio_rl64(pb);

  683.     avio_rl32(pb);

  684.     avio_r8(pb);

  685.     avio_r8(pb);

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

  687.     for(;;) {

  688.         uint64_t gpos= avio_tell(pb);

  689.         ff_get_guid(pb, &g);

  690.         gsize = avio_rl64(pb);

  691.         print_guid(&g);

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

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

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

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

  696.                 asf->data_object_size = gsize - 24;

  697.             } else {

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

  699.             }

  700.             break;

  701.         }

  702.         if (gsize < 24)

  703.             return AVERROR_INVALIDDATA;

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

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

  706.             if (ret < 0)

  707.                 return ret;

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

  709.             asf_read_stream_properties(s, gsize);

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

  711.             asf_read_content_desc(s, gsize);

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

  713.             asf_read_language_list(s, gsize);

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

  715.             asf_read_ext_content_desc(s, gsize);

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

  717.             asf_read_metadata(s, gsize);

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

  719.             asf_read_ext_stream_properties(s, gsize);

  720. 

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

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

  723.             continue;

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

  725.             ff_get_guid(pb, &g);

  726.             avio_skip(pb, 6);

  727.             continue;

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

  729.             asf_read_marker(s, gsize);

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

  731.             return AVERROR_EOF;

  732.         } else {

  733.             if (!s->keylen) {

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

  735.                     unsigned int len;

  736.                     AVPacket pkt;

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

  738.                     len= avio_rl32(pb);

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

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

  741.                     len= avio_rl32(pb);

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

  743.                     len= avio_rl32(pb);

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

  745.                     len= avio_rl32(pb);

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

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

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

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

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

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

  752.                 }

  753.             }

  754.         }

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

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

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

  758.     }

  759.     ff_get_guid(pb, &g);

  760.     avio_rl64(pb);

  761.     avio_r8(pb);

  762.     avio_r8(pb);

  763.     if (url_feof(pb))

  764.         return AVERROR_EOF;

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

  766.     asf->packet_size_left = 0;

  767. 

  768. 

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

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

  771.         if(stream_num>=0){

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

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

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

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

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

  777.                           &st->sample_aspect_ratio.num,

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

  779.             } 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.

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

  781.                           &st->sample_aspect_ratio.num,

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

  783. 

  784.             av_dlog(s, "i=%d, st->codec->codec_type:%d, asf->dar %d:%d sar=%d:%d\n",

  785.                     i, st->codec->codec_type, asf->dar[i].num, asf->dar[i].den,

  786.                     st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);

  787. 

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

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

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

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

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

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

  794.                     if (iso6392)

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

  796.                 }

  797.             }

  798.         }

  799.     }

  800. 

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

  802. 

  803.     return 0;

  804. }

  805. 

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

  807.     switch (bits & 3) \

  808.     { \

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

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

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

  812.     default: var = defval; break; \

  813.     }

  814. 

  815. /**

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

  817.  * @param s demux context

  818.  * @param pb context to read data from

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

  820.  */

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

  822. {

  823.     ASFContext *asf = s->priv_data;

  824.     uint32_t packet_length, padsize;

  825.     int rsize = 8;

  826.     int c, d, e, off;

  827. 

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

  829.     off= 32768;

  830.     if (asf->no_resync_search)

  831.         off = 3;

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

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

  834. 

  835.     c=d=e=-1;

  836.     while(off-- > 0){

  837.         c=d; d=e;

  838.         e= avio_r8(pb);

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

  840.             break;

  841.     }

  842. 

  843.     if (c != 0x82) {

  844.         /**

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

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

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

  848.          * the stream.

  849.          */

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

  851.             return AVERROR(EAGAIN);

  852.         if (!url_feof(pb))

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

  854.     }

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

  856.         if (d || e) {

  857.             if (!url_feof(pb))

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

  859.             return AVERROR_INVALIDDATA;

  860.         }

  861.         c= avio_r8(pb);

  862.         d= avio_r8(pb);

  863.         rsize+=3;

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

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

  866.     }

  867. 

  868.     asf->packet_flags    = c;

  869.     asf->packet_property = d;

  870. 

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

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

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

  874. 

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

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

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

  878.         return AVERROR_INVALIDDATA;

  879.     }

  880.     if(padsize >= packet_length){

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

  882.         return AVERROR_INVALIDDATA;

  883.     }

  884. 

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

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

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

  888. 

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

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

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

  892.     } else {

  893.         asf->packet_segments = 1;

  894.         asf->packet_segsizetype = 0x80;

  895.     }

  896.     if (rsize > packet_length - padsize) {

  897.         asf->packet_size_left = 0;

  898.         av_log(s, AV_LOG_ERROR,

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

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

  901.         return AVERROR_INVALIDDATA;

  902.     }

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

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

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

  906.     asf->packet_padsize = padsize;

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

  908.     return 0;

  909. }

  910. 

  911. /**

  912.  *

  913.  * @return <0 if error

  914.  */

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

  916.     ASFContext *asf = s->priv_data;

  917.     int rsize = 1;

  918.     int num = avio_r8(pb);

  919.     int64_t ts0, ts1 av_unused;

  920. 

  921.     asf->packet_segments--;

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

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

  924.     // sequence should be ignored!

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

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

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

  928.     av_dlog(asf, "key:%d stream:%d seq:%d offset:%d replic_size:%d\n",

  929.             asf->packet_key_frame, asf->stream_index, asf->packet_seq,

  930.             asf->packet_frag_offset, asf->packet_replic_size);

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

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

  933.         return AVERROR_INVALIDDATA;

  934.     }

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

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

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

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

  939.             return AVERROR_INVALIDDATA;

  940.         }

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

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

  943.             avio_skip(pb, 10);

  944.             ts0= avio_rl64(pb);

  945.             ts1= avio_rl64(pb);

  946.             avio_skip(pb, 12);

  947.             avio_rl32(pb);

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

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

  950.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  951.         }else

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

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

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

  955.         // multipacket - frag_offset is beginning timestamp

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

  957.         asf->packet_frag_offset = 0;

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

  959. 

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

  961.         rsize++;

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

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

  964.         return AVERROR_INVALIDDATA;

  965.     }

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

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

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

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

  970.             return AVERROR_INVALIDDATA;

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

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

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

  974.                 return AVERROR_INVALIDDATA;

  975.             } else {

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

  977.                 asf->packet_size_left += diff;

  978.                 asf->packet_padsize   -= diff;

  979.             }

  980.         }

  981.     } else {

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

  983.     }

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

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

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

  987.             return AVERROR_INVALIDDATA;

  988.     }

  989.     asf->packet_size_left -= rsize;

  990. 

  991.     return 0;

  992. }

  993. 

  994. /**

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

  996.  * with asf_get_packet()).

  997.  * @param s demux context

  998.  * @param pb context to read data from

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

  1000.  * @return 0 if data was stored in pkt, <0 on error or 1 if more ASF

  1001.  *          packets need to be loaded (through asf_get_packet())

  1002.  */

  1003. static int ff_asf_parse_packet(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)

  1004. {

  1005.     ASFContext *asf = s->priv_data;

  1006.     ASFStream *asf_st = 0;

  1007.     for (;;) {

  1008.         int ret;

  1009.         if(url_feof(pb))

  1010.             return AVERROR_EOF;

  1011.         if (asf->packet_size_left < FRAME_HEADER_SIZE

  1012.             || asf->packet_segments < 1) {

  1013.             //asf->packet_size_left <= asf->packet_padsize) {

  1014.             int ret = asf->packet_size_left + asf->packet_padsize;

  1015.             assert(ret>=0);

  1016.             /* fail safe */

  1017.             avio_skip(pb, ret);

  1018. 

  1019.             asf->packet_pos= avio_tell(pb);

  1020.             if (asf->data_object_size != (uint64_t)-1 &&

  1021.                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))

  1022.                 return AVERROR_EOF; /* Do not exceed the size of the data object */

  1023.             return 1;

  1024.         }

  1025.         if (asf->packet_time_start == 0) {

  1026.             if(asf_read_frame_header(s, pb) < 0){

  1027.                 asf->packet_segments= 0;

  1028.                 continue;

  1029.             }

  1030.             if (asf->stream_index < 0

  1031.                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL

  1032.                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)

  1033.                 ) {

  1034.                 asf->packet_time_start = 0;

  1035.                 /* unhandled packet (should not happen) */

  1036.                 avio_skip(pb, asf->packet_frag_size);

  1037.                 asf->packet_size_left -= asf->packet_frag_size;

  1038.                 if(asf->stream_index < 0)

  1039.                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);

  1040.                 continue;

  1041.             }

  1042.             asf->asf_st = s->streams[asf->stream_index]->priv_data;

  1043.         }

  1044.         asf_st = asf->asf_st;

  1045. 

  1046.         if (asf->packet_replic_size == 1) {

  1047.             // frag_offset is here used as the beginning timestamp

  1048.             asf->packet_frag_timestamp = asf->packet_time_start;

  1049.             asf->packet_time_start += asf->packet_time_delta;

  1050.             asf->packet_obj_size = asf->packet_frag_size = avio_r8(pb);

  1051.             asf->packet_size_left--;

  1052.             asf->packet_multi_size--;

  1053.             if (asf->packet_multi_size < asf->packet_obj_size)

  1054.             {

  1055.                 asf->packet_time_start = 0;

  1056.                 avio_skip(pb, asf->packet_multi_size);

  1057.                 asf->packet_size_left -= asf->packet_multi_size;

  1058.                 continue;

  1059.             }

  1060.             asf->packet_multi_size -= asf->packet_obj_size;

  1061.         }

  1062.         if(   /*asf->packet_frag_size == asf->packet_obj_size*/

  1063.               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size

  1064.            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){

  1065.             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",

  1066.                 asf_st->frag_offset, asf->packet_frag_size,

  1067.                 asf->packet_obj_size, asf_st->pkt.size);

  1068.             asf->packet_obj_size= asf_st->pkt.size;

  1069.         }

  1070. 

  1071.         if (   asf_st->pkt.size != asf->packet_obj_size

  1072.             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?

  1073.             if(asf_st->pkt.data){

  1074.                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);

  1075.                 asf_st->frag_offset = 0;

  1076.                 av_free_packet(&asf_st->pkt);

  1077.             }

  1078.             /* new packet */

  1079.             av_new_packet(&asf_st->pkt, asf->packet_obj_size);

  1080.             asf_st->seq = asf->packet_seq;

  1081.             asf_st->pkt.dts = asf->packet_frag_timestamp - asf->hdr.preroll;

  1082.             asf_st->pkt.stream_index = asf->stream_index;

  1083.             asf_st->pkt.pos =

  1084.             asf_st->packet_pos= asf->packet_pos;

  1085.             if (asf_st->pkt.data && asf_st->palette_changed) {

  1086.                 uint8_t *pal;

  1087.                 pal = av_packet_new_side_data(&asf_st->pkt, AV_PKT_DATA_PALETTE,

  1088.                                               AVPALETTE_SIZE);

  1089.                 if (!pal) {

  1090.                     av_log(s, AV_LOG_ERROR, "Cannot append palette to packet\n");

  1091.                 } else {

  1092.                     memcpy(pal, asf_st->palette, AVPALETTE_SIZE);

  1093.                     asf_st->palette_changed = 0;

  1094.                 }

  1095.             }

  1096.             av_dlog(asf, "new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",

  1097.                     asf->stream_index, asf->packet_key_frame,

  1098.                     asf_st->pkt.flags & AV_PKT_FLAG_KEY,

  1099.                     s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO,

  1100.                     asf->packet_obj_size);

  1101.             if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)

  1102.                 asf->packet_key_frame = 1;

  1103.             if (asf->packet_key_frame)

  1104.                 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;

  1105.         }

  1106. 

  1107.         /* read data */

  1108.         av_dlog(asf, "READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",

  1109.                 s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,

  1110.                 asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);

  1111.         asf->packet_size_left -= asf->packet_frag_size;

  1112.         if (asf->packet_size_left < 0)

  1113.             continue;

  1114. 

  1115.         if(   asf->packet_frag_offset >= asf_st->pkt.size

  1116.            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){

  1117.             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",

  1118.                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);

  1119.             continue;

  1120.         }

  1121. 

  1122.         ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,

  1123.                          asf->packet_frag_size);

  1124.         if (ret != asf->packet_frag_size) {

  1125.             if (ret < 0 || asf->packet_frag_offset + ret == 0)

  1126.                 return ret < 0 ? ret : AVERROR_EOF;

  1127.             if (asf_st->ds_span > 1) {

  1128.                 // scrambling, we can either drop it completely or fill the remainder

  1129.                 // TODO: should we fill the whole packet instead of just the current

  1130.                 // fragment?

  1131.                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,

  1132.                        asf->packet_frag_size - ret);

  1133.                 ret = asf->packet_frag_size;

  1134.             } else

  1135.                 // no scrambling, so we can return partial packets

  1136.                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);

  1137.         }

  1138.         if (s->key && s->keylen == 20)

  1139.             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,

  1140.                             ret);

  1141.         asf_st->frag_offset += ret;

  1142.         /* test if whole packet is read */

  1143.         if (asf_st->frag_offset == asf_st->pkt.size) {

  1144.             //workaround for macroshit radio DVR-MS files

  1145.             if(   s->streams[asf->stream_index]->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO

  1146.                && asf_st->pkt.size > 100){

  1147.                 int i;

  1148.                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);

  1149.                 if(i == asf_st->pkt.size){

  1150.                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");

  1151.                     asf_st->frag_offset = 0;

  1152.                     av_free_packet(&asf_st->pkt);

  1153.                     continue;

  1154.                 }

  1155.             }

  1156. 

  1157.             /* return packet */

  1158.             if (asf_st->ds_span > 1) {

  1159.               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){

  1160.                     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);

  1161.               }else{

  1162.                 /* packet descrambling */

  1163.                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);

  1164.                 if (newdata) {

  1165.                     int offset = 0;

  1166.                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

  1167.                     while (offset < asf_st->pkt.size) {

  1168.                         int off = offset / asf_st->ds_chunk_size;

  1169.                         int row = off / asf_st->ds_span;

  1170.                         int col = off % asf_st->ds_span;

  1171.                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;

  1172.                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);

  1173.                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);

  1174.                         memcpy(newdata + offset,

  1175.                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,

  1176.                                asf_st->ds_chunk_size);

  1177.                         offset += asf_st->ds_chunk_size;

  1178.                     }

  1179.                     av_free(asf_st->pkt.data);

  1180.                     asf_st->pkt.data = newdata;

  1181.                 }

  1182.               }

  1183.             }

  1184.             asf_st->frag_offset = 0;

  1185.             *pkt= asf_st->pkt;

  1186.             asf_st->pkt.size = 0;

  1187.             asf_st->pkt.data = 0;

  1188.             asf_st->pkt.side_data_elems = 0;

  1189.             asf_st->pkt.side_data = NULL;

  1190.             break; // packet completed

  1191.         }

  1192.     }

  1193.     return 0;

  1194. }

  1195. 

  1196. static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)

  1197. {

  1198.     ASFContext *asf = s->priv_data;

  1199. 

  1200.     for (;;) {

  1201.         int ret;

  1202. 

  1203.         /* parse cached packets, if any */

  1204.         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)

  1205.             return ret;

  1206.         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)

  1207.             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);

  1208.         asf->packet_time_start = 0;

  1209.     }

  1210. }

  1211. 

  1212. // Added to support seeking after packets have been read

  1213. // If information is not reset, read_packet fails due to

  1214. // leftover information from previous reads

  1215. static void asf_reset_header(AVFormatContext *s)

  1216. {

  1217.     ASFContext *asf = s->priv_data;

  1218.     ASFStream *asf_st;

  1219.     int i;

  1220. 

  1221.     asf->packet_size_left = 0;

  1222.     asf->packet_segments = 0;

  1223.     asf->packet_flags = 0;

  1224.     asf->packet_property = 0;

  1225.     asf->packet_timestamp = 0;

  1226.     asf->packet_segsizetype = 0;

  1227.     asf->packet_segments = 0;

  1228.     asf->packet_seq = 0;

  1229.     asf->packet_replic_size = 0;

  1230.     asf->packet_key_frame = 0;

  1231.     asf->packet_padsize = 0;

  1232.     asf->packet_frag_offset = 0;

  1233.     asf->packet_frag_size = 0;

  1234.     asf->packet_frag_timestamp = 0;

  1235.     asf->packet_multi_size = 0;

  1236.     asf->packet_obj_size = 0;

  1237.     asf->packet_time_delta = 0;

  1238.     asf->packet_time_start = 0;

  1239. 

  1240.     for(i=0; i<s->nb_streams; i++){

  1241.         asf_st= s->streams[i]->priv_data;

  1242.         av_free_packet(&asf_st->pkt);

  1243.         asf_st->frag_offset=0;

  1244.         asf_st->seq=0;

  1245.     }

  1246.     asf->asf_st= NULL;

  1247. }

  1248. 

  1249. static int asf_read_close(AVFormatContext *s)

  1250. {

  1251.     asf_reset_header(s);

  1252. 

  1253.     return 0;

  1254. }

  1255. 

  1256. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  1257. {

  1258.     AVPacket pkt1, *pkt = &pkt1;

  1259.     ASFStream *asf_st;

  1260.     int64_t pts;

  1261.     int64_t pos= *ppos;

  1262.     int i;

  1263.     int64_t start_pos[ASF_MAX_STREAMS];

  1264. 

  1265.     for(i=0; i<s->nb_streams; i++){

  1266.         start_pos[i]= pos;

  1267.     }

  1268. 

  1269.     if (s->packet_size > 0)

  1270.         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;

  1271.     *ppos= pos;

  1272.     if (avio_seek(s->pb, pos, SEEK_SET) < 0)

  1273.         return AV_NOPTS_VALUE;

  1274. 

  1275.     asf_reset_header(s);

  1276.     for(;;){

  1277.         if (av_read_frame(s, pkt) < 0){

  1278.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1279.             return AV_NOPTS_VALUE;

  1280.         }

  1281. 

  1282.         pts = pkt->dts;

  1283. 

  1284.         av_free_packet(pkt);

  1285.         if(pkt->flags&AV_PKT_FLAG_KEY){

  1286.             i= pkt->stream_index;

  1287. 

  1288.             asf_st= s->streams[i]->priv_data;

  1289. 

  1290. //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);

  1291.             pos= asf_st->packet_pos;

  1292. 

  1293.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1294.             start_pos[i]= asf_st->packet_pos + 1;

  1295. 

  1296.             if(pkt->stream_index == stream_index)

  1297.                break;

  1298.         }

  1299.     }

  1300. 

  1301.     *ppos= pos;

  1302.     return pts;

  1303. }

  1304. 

  1305. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1306. {

  1307.     ff_asf_guid g;

  1308.     ASFContext *asf = s->priv_data;

  1309.     int64_t current_pos= avio_tell(s->pb);

  1310. 

  1311.     if(avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET) < 0) {

  1312.         asf->index_read= -1;

  1313.         return;

  1314.     }

  1315. 

  1316.     ff_get_guid(s->pb, &g);

  1317. 

  1318.     /* the data object can be followed by other top-level objects,

  1319.        skip them until the simple index object is reached */

  1320.     while (ff_guidcmp(&g, &ff_asf_simple_index_header)) {

  1321.         int64_t gsize= avio_rl64(s->pb);

  1322.         if (gsize < 24 || url_feof(s->pb)) {

  1323.             avio_seek(s->pb, current_pos, SEEK_SET);

  1324.             asf->index_read= -1;

  1325.             return;

  1326.         }

  1327.         avio_skip(s->pb, gsize-24);

  1328.         ff_get_guid(s->pb, &g);

  1329.     }

  1330. 

  1331.     {

  1332.         int64_t itime, last_pos=-1;

  1333.         int pct, ict;

  1334.         int i;

  1335.         int64_t av_unused gsize= avio_rl64(s->pb);

  1336.         ff_get_guid(s->pb, &g);

  1337.         itime=avio_rl64(s->pb);

  1338.         pct=avio_rl32(s->pb);

  1339.         ict=avio_rl32(s->pb);

  1340.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1341. 

  1342.         for (i=0;i<ict;i++){

  1343.             int pktnum=avio_rl32(s->pb);

  1344.             int pktct =avio_rl16(s->pb);

  1345.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1346.             int64_t index_pts= FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);

  1347. 

  1348.             if(pos != last_pos){

  1349.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d  pts: %"PRId64"\n", pktnum, pktct, index_pts);

  1350.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1351.             last_pos=pos;

  1352.             }

  1353.         }

  1354.         asf->index_read= ict > 1;

  1355.     }

  1356.     avio_seek(s->pb, current_pos, SEEK_SET);

  1357. }

  1358. 

  1359. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1360. {

  1361.     ASFContext *asf = s->priv_data;

  1362.     AVStream *st = s->streams[stream_index];

  1363. 

  1364.     if (s->packet_size <= 0)

  1365.         return -1;

  1366. 

  1367.     /* Try using the protocol's read_seek if available */

  1368.     if(s->pb) {

  1369.         int ret = avio_seek_time(s->pb, stream_index, pts, flags);

  1370.         if(ret >= 0)

  1371.             asf_reset_header(s);

  1372.         if (ret != AVERROR(ENOSYS))

  1373.             return ret;

  1374.     }

  1375. 

  1376.     if (!asf->index_read)

  1377.         asf_build_simple_index(s, stream_index);

  1378. 

  1379.     if((asf->index_read > 0 && st->index_entries)){

  1380.         int index= av_index_search_timestamp(st, pts, flags);

  1381.         if(index >= 0) {

  1382.             /* find the position */

  1383.             uint64_t pos = st->index_entries[index].pos;

  1384. 

  1385.             /* do the seek */

  1386.             av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1387.             if(avio_seek(s->pb, pos, SEEK_SET) < 0)

  1388.                 return -1;

  1389.             asf_reset_header(s);

  1390.             return 0;

  1391.         }

  1392.     }

  1393.     /* no index or seeking by index failed */

  1394.     if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)

  1395.         return -1;

  1396.     asf_reset_header(s);

  1397.     return 0;

  1398. }

  1399. 

  1400. AVInputFormat ff_asf_demuxer = {

  1401.     .name           = "asf",

  1402.     .long_name      = NULL_IF_CONFIG_SMALL("ASF (Advanced / Active Streaming Format)"),

  1403.     .priv_data_size = sizeof(ASFContext),

  1404.     .read_probe     = asf_probe,

  1405.     .read_header    = asf_read_header,

  1406.     .read_packet    = asf_read_packet,

  1407.     .read_close     = asf_read_close,

  1408.     .read_seek      = asf_read_seek,

  1409.     .read_timestamp = asf_read_pts,

  1410.     .flags          = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,

  1411.     .priv_class     = &asf_class,

  1412. };