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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 Libav.

  6.  *

  7.  * Libav 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.  * Libav 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 Libav; if not, write to the Free Software

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

  20.  */

  21. 

  22. //#define DEBUG

  23. 

  24. #include "libavutil/bswap.h"

  25. #include "libavutil/common.h"

  26. #include "libavutil/avstring.h"

  27. #include "libavutil/dict.h"

  28. #include "libavcodec/mpegaudio.h"

  29. #include "avformat.h"

  30. #include "avio_internal.h"

  31. #include "riff.h"

  32. #include "asf.h"

  33. #include "asfcrypt.h"

  34. #include "avlanguage.h"

  35. 

  36. typedef struct {

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

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

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

  40.     AVRational dar[128];

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

  42.     /* non streamed additonnal info */

  43.     /* packet filling */

  44.     int packet_size_left;

  45.     /* only for reading */

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

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

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

  49.     int index_read;

  50. 

  51.     ASFMainHeader hdr;

  52. 

  53.     int packet_flags;

  54.     int packet_property;

  55.     int packet_timestamp;

  56.     int packet_segsizetype;

  57.     int packet_segments;

  58.     int packet_seq;

  59.     int packet_replic_size;

  60.     int packet_key_frame;

  61.     int packet_padsize;

  62.     unsigned int packet_frag_offset;

  63.     unsigned int packet_frag_size;

  64.     int64_t packet_frag_timestamp;

  65.     int packet_multi_size;

  66.     int packet_obj_size;

  67.     int packet_time_delta;

  68.     int packet_time_start;

  69.     int64_t packet_pos;

  70. 

  71.     int stream_index;

  72. 

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

  74. } ASFContext;

  75. 

  76. #undef NDEBUG

  77. #include <assert.h>

  78. 

  79. #define ASF_MAX_STREAMS 127

  80. #define FRAME_HEADER_SIZE 17

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

  82. 

  83. static const ff_asf_guid index_guid = {

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

  85. };

  86. 

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

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

  89. };

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

  91. /* decoding */

  92. 

  93. #ifdef DEBUG

  94. #define PRINT_IF_GUID(g,cmp) \

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

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

  97. 

  98. static void print_guid(const ff_asf_guid *g)

  99. {

  100.     int i;

  101.     PRINT_IF_GUID(g, ff_asf_header);

  102.     else PRINT_IF_GUID(g, ff_asf_file_header);

  103.     else PRINT_IF_GUID(g, ff_asf_stream_header);

  104.     else PRINT_IF_GUID(g, ff_asf_audio_stream);

  105.     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);

  106.     else PRINT_IF_GUID(g, ff_asf_video_stream);

  107.     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);

  108.     else PRINT_IF_GUID(g, ff_asf_command_stream);

  109.     else PRINT_IF_GUID(g, ff_asf_comment_header);

  110.     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);

  111.     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);

  112.     else PRINT_IF_GUID(g, ff_asf_data_header);

  113.     else PRINT_IF_GUID(g, index_guid);

  114.     else PRINT_IF_GUID(g, ff_asf_head1_guid);

  115.     else PRINT_IF_GUID(g, ff_asf_head2_guid);

  116.     else PRINT_IF_GUID(g, ff_asf_my_guid);

  117.     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);

  118.     else PRINT_IF_GUID(g, ff_asf_extended_content_header);

  119.     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);

  120.     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);

  121.     else PRINT_IF_GUID(g, ff_asf_metadata_header);

  122.     else PRINT_IF_GUID(g, ff_asf_marker_header);

  123.     else PRINT_IF_GUID(g, stream_bitrate_guid);

  124.     else PRINT_IF_GUID(g, ff_asf_language_guid);

  125.     else

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

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

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

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

  130. }

  131. #undef PRINT_IF_GUID

  132. #else

  133. #define print_guid(g)

  134. #endif

  135. 

  136. void ff_get_guid(AVIOContext *s, ff_asf_guid *g)

  137. {

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

  139.     avio_read(s, *g, sizeof(*g));

  140. }

  141. 

  142. static int asf_probe(AVProbeData *pd)

  143. {

  144.     /* check file header */

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

  146.         return AVPROBE_SCORE_MAX;

  147.     else

  148.         return 0;

  149. }

  150. 

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

  152.     switch(type){

  153.         case 2: return avio_rl32(pb);

  154.         case 3: return avio_rl32(pb);

  155.         case 4: return avio_rl64(pb);

  156.         case 5: return avio_rl16(pb);

  157.         default:return INT_MIN;

  158.     }

  159. }

  160. 

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

  162. {

  163.     char *value;

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

  165. 

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

  167.         return;

  168. 

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

  170.     if (!value)

  171.         goto finish;

  172. 

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

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

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

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

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

  178.     } else {

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

  180.         goto finish;

  181.     }

  182.     if (*value)

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

  184. finish:

  185.     av_freep(&value);

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

  187. }

  188. 

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

  190. {

  191.     ASFContext *asf = s->priv_data;

  192.     AVIOContext *pb = s->pb;

  193. 

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

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

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

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

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

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

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

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

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

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

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

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

  206.         return AVERROR_INVALIDDATA;

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

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

  209. 

  210.     return 0;

  211. }

  212. 

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

  214. {

  215.     ASFContext *asf = s->priv_data;

  216.     AVIOContext *pb = s->pb;

  217.     AVStream *st;

  218.     ASFStream *asf_st;

  219.     ff_asf_guid g;

  220.     enum AVMediaType type;

  221.     int type_specific_size, sizeX;

  222.     unsigned int tag1;

  223.     int64_t pos1, pos2, start_time;

  224.     int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  225. 

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

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

  228.         return AVERROR(EINVAL);

  229.     }

  230. 

  231.     pos1 = avio_tell(pb);

  232. 

  233.     st = av_new_stream(s, 0);

  234.     if (!st)

  235.         return AVERROR(ENOMEM);

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

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

  238.     if (!asf_st)

  239.         return AVERROR(ENOMEM);

  240.     st->priv_data = asf_st;

  241.     st->start_time = 0;

  242.     start_time = asf->hdr.preroll;

  243. 

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

  245. 

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

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

  248.             (10000000 / 1000) - start_time;

  249.     }

  250.     ff_get_guid(pb, &g);

  251. 

  252.     test_for_ext_stream_audio = 0;

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

  254.         type = AVMEDIA_TYPE_AUDIO;

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

  256.         type = AVMEDIA_TYPE_VIDEO;

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

  258.         type = AVMEDIA_TYPE_VIDEO;

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

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

  261.         type = AVMEDIA_TYPE_DATA;

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

  263.         test_for_ext_stream_audio = 1;

  264.         type = AVMEDIA_TYPE_UNKNOWN;

  265.     } else {

  266.         return -1;

  267.     }

  268.     ff_get_guid(pb, &g);

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

  270.     type_specific_size = avio_rl32(pb);

  271.     avio_rl32(pb);

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

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

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

  275. 

  276.     avio_rl32(pb);

  277. 

  278.     if (test_for_ext_stream_audio) {

  279.         ff_get_guid(pb, &g);

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

  281.             type = AVMEDIA_TYPE_AUDIO;

  282.             is_dvr_ms_audio=1;

  283.             ff_get_guid(pb, &g);

  284.             avio_rl32(pb);

  285.             avio_rl32(pb);

  286.             avio_rl32(pb);

  287.             ff_get_guid(pb, &g);

  288.             avio_rl32(pb);

  289.         }

  290.     }

  291. 

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

  293.     if (type == AVMEDIA_TYPE_AUDIO) {

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

  295.         if (ret < 0)

  296.             return ret;

  297.         if (is_dvr_ms_audio) {

  298.             // codec_id and codec_tag are unreliable in dvr_ms

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

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

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

  302.         }

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

  304.             st->need_parsing = AVSTREAM_PARSE_NONE;

  305.         } else {

  306.             st->need_parsing = AVSTREAM_PARSE_FULL;

  307.         }

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

  309.         pos2 = avio_tell(pb);

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

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

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

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

  314.             avio_rl16(pb); //ds_data_size

  315.             avio_r8(pb);   //ds_silence_data

  316.         }

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

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

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

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

  321.             if (!asf_st->ds_chunk_size

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

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

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

  325.         }

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

  327.             case CODEC_ID_MP3:

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

  329.                 break;

  330.             case CODEC_ID_PCM_S16LE:

  331.             case CODEC_ID_PCM_S16BE:

  332.             case CODEC_ID_PCM_U16LE:

  333.             case CODEC_ID_PCM_U16BE:

  334.             case CODEC_ID_PCM_S8:

  335.             case CODEC_ID_PCM_U8:

  336.             case CODEC_ID_PCM_ALAW:

  337.             case CODEC_ID_PCM_MULAW:

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

  339.                 break;

  340.             default:

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

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

  343.                 break;

  344.         }

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

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

  347.         avio_rl32(pb);

  348.         avio_rl32(pb);

  349.         avio_r8(pb);

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

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

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

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

  354.         /* not available for asf */

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

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

  357.         tag1 = avio_rl32(pb);

  358.         avio_skip(pb, 20);

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

  360.         if (sizeX > 40) {

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

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

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

  364.         }

  365. 

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

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

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

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

  370.             int av_unused i;

  371. #if HAVE_BIGENDIAN

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

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

  374. #else

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

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

  377. #endif

  378.             asf_st->palette_changed = 1;

  379.         }

  380. 

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

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

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

  384.             st->need_parsing = AVSTREAM_PARSE_FULL;

  385.             // 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

  386.             st->codec->width  =

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

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

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

  390.         }

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

  392.             st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;

  393.     }

  394.     pos2 = avio_tell(pb);

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

  396. 

  397.     return 0;

  398. }

  399. 

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

  401. {

  402.     ASFContext *asf = s->priv_data;

  403.     AVIOContext *pb = s->pb;

  404.     ff_asf_guid g;

  405.     int ext_len, payload_ext_ct, stream_ct, i;

  406.     uint32_t leak_rate, stream_num;

  407.     unsigned int stream_languageid_index;

  408. 

  409.     avio_rl64(pb); // starttime

  410.     avio_rl64(pb); // endtime

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

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

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

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

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

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

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

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

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

  420. 

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

  422.     if (stream_num < 128)

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

  424. 

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

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

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

  428. 

  429.     if (stream_num < 128)

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

  431. 

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

  433.         avio_rl16(pb);

  434.         ext_len = avio_rl16(pb);

  435.         avio_skip(pb, ext_len);

  436.     }

  437. 

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

  439.         ff_get_guid(pb, &g);

  440.         avio_skip(pb, 2);

  441.         ext_len=avio_rl32(pb);

  442.         avio_skip(pb, ext_len);

  443.     }

  444. 

  445.     return 0;

  446. }

  447. 

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

  449. {

  450.     AVIOContext *pb = s->pb;

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

  452. 

  453.     len1 = avio_rl16(pb);

  454.     len2 = avio_rl16(pb);

  455.     len3 = avio_rl16(pb);

  456.     len4 = avio_rl16(pb);

  457.     len5 = avio_rl16(pb);

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

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

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

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

  462.     avio_skip(pb, len5);

  463. 

  464.     return 0;

  465. }

  466. 

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

  468. {

  469.     AVIOContext *pb = s->pb;

  470.     ASFContext *asf = s->priv_data;

  471.     int desc_count, i, ret;

  472. 

  473.     desc_count = avio_rl16(pb);

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

  475.         int name_len,value_type,value_len;

  476.         char name[1024];

  477. 

  478.         name_len = avio_rl16(pb);

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

  480.             name_len += 1;

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

  482.             avio_skip(pb, name_len - ret);

  483.         value_type = avio_rl16(pb);

  484.         value_len  = avio_rl16(pb);

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

  486.             value_len += 1;

  487.         /**

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

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

  490.          */

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

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

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

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

  495.         } else

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

  497.     }

  498. 

  499.     return 0;

  500. }

  501. 

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

  503. {

  504.     AVIOContext *pb = s->pb;

  505.     ASFContext *asf = s->priv_data;

  506.     int j, ret;

  507.     int stream_count = avio_rl16(pb);

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

  509.         char lang[6];

  510.         unsigned int lang_len = avio_r8(pb);

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

  512.             avio_skip(pb, lang_len - ret);

  513.         if (j < 128)

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

  515.     }

  516. 

  517.     return 0;

  518. }

  519. 

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

  521. {

  522.     AVIOContext *pb = s->pb;

  523.     ASFContext *asf = s->priv_data;

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

  525.     int ret, i;

  526.     n = avio_rl16(pb);

  527. 

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

  529.         char name[1024];

  530. 

  531.         avio_rl16(pb); //lang_list_index

  532.         stream_num= avio_rl16(pb);

  533.         name_len=   avio_rl16(pb);

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

  535.         value_len=  avio_rl32(pb);

  536. 

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

  538.             avio_skip(pb, name_len - ret);

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

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

  541.         avio_skip(pb, value_len - 2);

  542. 

  543.         if(stream_num<128){

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

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

  546.         }

  547.     }

  548. 

  549.     return 0;

  550. }

  551. 

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

  553. {

  554.     AVIOContext *pb = s->pb;

  555.     int i, count, name_len, ret;

  556.     char name[1024];

  557. 

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

  559.     avio_rl64(pb);            // ...

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

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

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

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

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

  565.     }

  566. 

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

  568.         int64_t pres_time;

  569.         int name_len;

  570. 

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

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

  573.         avio_rl16(pb);             // entry length

  574.         avio_rl32(pb);             // send time

  575.         avio_rl32(pb);             // flags

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

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

  578.             avio_skip(pb, name_len - ret);

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

  580.     }

  581. 

  582.     return 0;

  583. }

  584. 

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

  586. {

  587.     ASFContext *asf = s->priv_data;

  588.     ff_asf_guid g;

  589.     AVIOContext *pb = s->pb;

  590.     int i;

  591.     int64_t gsize;

  592. 

  593.     ff_get_guid(pb, &g);

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

  595.         return -1;

  596.     avio_rl64(pb);

  597.     avio_rl32(pb);

  598.     avio_r8(pb);

  599.     avio_r8(pb);

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

  601.     for(;;) {

  602.         uint64_t gpos= avio_tell(pb);

  603.         ff_get_guid(pb, &g);

  604.         gsize = avio_rl64(pb);

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

  606.         print_guid(&g);

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

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

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

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

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

  612.                 asf->data_object_size = gsize - 24;

  613.             } else {

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

  615.             }

  616.             break;

  617.         }

  618.         if (gsize < 24)

  619.             return -1;

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

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

  622.             if (ret < 0)

  623.                 return ret;

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

  625.             asf_read_stream_properties(s, gsize);

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

  627.             asf_read_content_desc(s, gsize);

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

  629.             asf_read_language_list(s, gsize);

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

  631.             asf_read_ext_content_desc(s, gsize);

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

  633.             asf_read_metadata(s, gsize);

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

  635.             asf_read_ext_stream_properties(s, gsize);

  636. 

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

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

  639.             continue;

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

  641.             ff_get_guid(pb, &g);

  642.             avio_skip(pb, 6);

  643.             continue;

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

  645.             asf_read_marker(s, gsize);

  646.         } else if (pb->eof_reached) {

  647.             return -1;

  648.         } else {

  649.             if (!s->keylen) {

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

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

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

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

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

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

  656.                 }

  657.             }

  658.         }

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

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

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

  662.     }

  663.     ff_get_guid(pb, &g);

  664.     avio_rl64(pb);

  665.     avio_r8(pb);

  666.     avio_r8(pb);

  667.     if (pb->eof_reached)

  668.         return -1;

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

  670.     asf->packet_size_left = 0;

  671. 

  672. 

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

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

  675.         if(stream_num>=0){

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

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

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

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

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

  681.                           &st->sample_aspect_ratio.den,

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

  683.             } 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.

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

  685.                           &st->sample_aspect_ratio.den,

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

  687. 

  688. //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);

  689. 

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

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

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

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

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

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

  696.                     if (iso6392)

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

  698.                 }

  699.             }

  700.         }

  701.     }

  702. 

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

  704. 

  705.     return 0;

  706. }

  707. 

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

  709.     switch (bits & 3) \

  710.     { \

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

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

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

  714.     default: var = defval; break; \

  715.     }

  716. 

  717. /**

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

  719.  * @param s demux context

  720.  * @param pb context to read data from

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

  722.  */

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

  724. {

  725.     ASFContext *asf = s->priv_data;

  726.     uint32_t packet_length, padsize;

  727.     int rsize = 8;

  728.     int c, d, e, off;

  729. 

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

  731.     off= 32768;

  732.     if (s->packet_size > 0)

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

  734. 

  735.     c=d=e=-1;

  736.     while(off-- > 0){

  737.         c=d; d=e;

  738.         e= avio_r8(pb);

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

  740.             break;

  741.     }

  742. 

  743.     if (c != 0x82) {

  744.         /**

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

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

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

  748.          * the stream.

  749.          */

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

  751.             return AVERROR(EAGAIN);

  752.         if (!pb->eof_reached)

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

  754.     }

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

  756.         if (d || e) {

  757.             if (!pb->eof_reached)

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

  759.             return -1;

  760.         }

  761.         c= avio_r8(pb);

  762.         d= avio_r8(pb);

  763.         rsize+=3;

  764.     } else if (!pb->eof_reached) {

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

  766.     }

  767. 

  768.     asf->packet_flags    = c;

  769.     asf->packet_property = d;

  770. 

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

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

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

  774. 

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

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

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

  778.         return -1;

  779.     }

  780.     if(padsize >= packet_length){

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

  782.         return -1;

  783.     }

  784. 

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

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

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

  788. 

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

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

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

  792.     } else {

  793.         asf->packet_segments = 1;

  794.         asf->packet_segsizetype = 0x80;

  795.     }

  796.     if (rsize > packet_length - padsize) {

  797.         asf->packet_size_left = 0;

  798.         av_log(s, AV_LOG_ERROR,

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

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

  801.         return -1;

  802.     }

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

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

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

  806.     asf->packet_padsize = padsize;

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

  808.     return 0;

  809. }

  810. 

  811. /**

  812.  *

  813.  * @return <0 if error

  814.  */

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

  816.     ASFContext *asf = s->priv_data;

  817.     int rsize = 1;

  818.     int num = avio_r8(pb);

  819.     int64_t ts0;

  820. 

  821.     asf->packet_segments--;

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

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

  824.     // sequence should be ignored!

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

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

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

  828. //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);

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

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

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

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

  833.             return -1;

  834.         }

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

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

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

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

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

  840.             avio_skip(pb, 10);

  841.             ts0= avio_rl64(pb);

  842.             avio_skip(pb, 8);;

  843.             avio_skip(pb, 12);

  844.             avio_rl32(pb);

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

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

  847.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  848.         }else

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

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

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

  852.         // multipacket - frag_offset is beginning timestamp

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

  854.         asf->packet_frag_offset = 0;

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

  856. 

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

  858.         rsize++;

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

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

  861.         return -1;

  862.     }

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

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

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

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

  867.             return -1;

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

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

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

  871.                 return -1;

  872.             } else {

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

  874.                 asf->packet_size_left += diff;

  875.                 asf->packet_padsize   -= diff;

  876.             }

  877.         }

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

  879.     } else {

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

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

  882.             return -1;

  883.         }

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

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

  886.     }

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

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

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

  890.             return -1;

  891.     }

  892.     asf->packet_size_left -= rsize;

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

  894. 

  895.     return 0;

  896. }

  897. 

  898. /**

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

  900.  * with asf_get_packet()).

  901.  * @param s demux context

  902.  * @param pb context to read data from

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

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

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

  906.  */

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

  908. {

  909.     ASFContext *asf = s->priv_data;

  910.     ASFStream *asf_st = 0;

  911.     for (;;) {

  912.         int ret;

  913.         if(pb->eof_reached)

  914.             return AVERROR_EOF;

  915.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  920.             assert(ret>=0);

  921.             /* fail safe */

  922.             avio_skip(pb, ret);

  923. 

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

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

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

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

  928.             return 1;

  929.         }

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

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

  932.                 asf->packet_segments= 0;

  933.                 continue;

  934.             }

  935.             if (asf->stream_index < 0

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

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

  938.                 ) {

  939.                 asf->packet_time_start = 0;

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

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

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

  943.                 if(asf->stream_index < 0)

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

  945.                 continue;

  946.             }

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

  948.         }

  949.         asf_st = asf->asf_st;

  950. 

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

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

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

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

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

  956.             asf->packet_size_left--;

  957.             asf->packet_multi_size--;

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

  959.             {

  960.                 asf->packet_time_start = 0;

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

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

  963.                 continue;

  964.             }

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

  966.             //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);

  967.         }

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

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

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

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

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

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

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

  975.         }

  976. 

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

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

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

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

  981.                 asf_st->frag_offset = 0;

  982.                 av_free_packet(&asf_st->pkt);

  983.             }

  984.             /* new packet */

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

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

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

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

  989.             asf_st->pkt.pos =

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

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

  992.                 uint8_t *pal;

  993.                 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE,

  994.                                               AVPALETTE_SIZE);

  995.                 if (!pal) {

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

  997.                 } else {

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

  999.                     asf_st->palette_changed = 0;

  1000.                 }

  1001.             }

  1002. //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",

  1003. //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,

  1004. //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);

  1005.             if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)

  1006.                 asf->packet_key_frame = 1;

  1007.             if (asf->packet_key_frame)

  1008.                 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;

  1009.         }

  1010. 

  1011.         /* read data */

  1012.         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",

  1013.         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,

  1014.         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);

  1015.         asf->packet_size_left -= asf->packet_frag_size;

  1016.         if (asf->packet_size_left < 0)

  1017.             continue;

  1018. 

  1019.         if(   asf->packet_frag_offset >= asf_st->pkt.size

  1020.            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){

  1021.             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",

  1022.                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);

  1023.             continue;

  1024.         }

  1025. 

  1026.         ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,

  1027.                          asf->packet_frag_size);

  1028.         if (ret != asf->packet_frag_size) {

  1029.             if (ret < 0 || asf->packet_frag_offset + ret == 0)

  1030.                 return ret < 0 ? ret : AVERROR_EOF;

  1031.             if (asf_st->ds_span > 1) {

  1032.                 // scrambling, we can either drop it completely or fill the remainder

  1033.                 // TODO: should we fill the whole packet instead of just the current

  1034.                 // fragment?

  1035.                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,

  1036.                        asf->packet_frag_size - ret);

  1037.                 ret = asf->packet_frag_size;

  1038.             } else

  1039.                 // no scrambling, so we can return partial packets

  1040.                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);

  1041.         }

  1042.         if (s->key && s->keylen == 20)

  1043.             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,

  1044.                             ret);

  1045.         asf_st->frag_offset += ret;

  1046.         /* test if whole packet is read */

  1047.         if (asf_st->frag_offset == asf_st->pkt.size) {

  1048.             //workaround for macroshit radio DVR-MS files

  1049.             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO

  1050.                && asf_st->pkt.size > 100){

  1051.                 int i;

  1052.                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);

  1053.                 if(i == asf_st->pkt.size){

  1054.                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");

  1055.                     asf_st->frag_offset = 0;

  1056.                     av_free_packet(&asf_st->pkt);

  1057.                     continue;

  1058.                 }

  1059.             }

  1060. 

  1061.             /* return packet */

  1062.             if (asf_st->ds_span > 1) {

  1063.               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){

  1064.                     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);

  1065.               }else{

  1066.                 /* packet descrambling */

  1067.                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);

  1068.                 if (newdata) {

  1069.                     int offset = 0;

  1070.                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

  1071.                     while (offset < asf_st->pkt.size) {

  1072.                         int off = offset / asf_st->ds_chunk_size;

  1073.                         int row = off / asf_st->ds_span;

  1074.                         int col = off % asf_st->ds_span;

  1075.                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;

  1076.                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);

  1077. 

  1078.                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);

  1079.                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);

  1080.                         memcpy(newdata + offset,

  1081.                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,

  1082.                                asf_st->ds_chunk_size);

  1083.                         offset += asf_st->ds_chunk_size;

  1084.                     }

  1085.                     av_free(asf_st->pkt.data);

  1086.                     asf_st->pkt.data = newdata;

  1087.                 }

  1088.               }

  1089.             }

  1090.             asf_st->frag_offset = 0;

  1091.             *pkt= asf_st->pkt;

  1092.             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);

  1093.             asf_st->pkt.size = 0;

  1094.             asf_st->pkt.data = 0;

  1095.             break; // packet completed

  1096.         }

  1097.     }

  1098.     return 0;

  1099. }

  1100. 

  1101. static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)

  1102. {

  1103.     ASFContext *asf = s->priv_data;

  1104. 

  1105.     for (;;) {

  1106.         int ret;

  1107. 

  1108.         /* parse cached packets, if any */

  1109.         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)

  1110.             return ret;

  1111.         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)

  1112.             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);

  1113.         asf->packet_time_start = 0;

  1114.     }

  1115. 

  1116.     return 0;

  1117. }

  1118. 

  1119. // Added to support seeking after packets have been read

  1120. // If information is not reset, read_packet fails due to

  1121. // leftover information from previous reads

  1122. static void asf_reset_header(AVFormatContext *s)

  1123. {

  1124.     ASFContext *asf = s->priv_data;

  1125.     ASFStream *asf_st;

  1126.     int i;

  1127. 

  1128.     asf->packet_size_left = 0;

  1129.     asf->packet_segments = 0;

  1130.     asf->packet_flags = 0;

  1131.     asf->packet_property = 0;

  1132.     asf->packet_timestamp = 0;

  1133.     asf->packet_segsizetype = 0;

  1134.     asf->packet_segments = 0;

  1135.     asf->packet_seq = 0;

  1136.     asf->packet_replic_size = 0;

  1137.     asf->packet_key_frame = 0;

  1138.     asf->packet_padsize = 0;

  1139.     asf->packet_frag_offset = 0;

  1140.     asf->packet_frag_size = 0;

  1141.     asf->packet_frag_timestamp = 0;

  1142.     asf->packet_multi_size = 0;

  1143.     asf->packet_obj_size = 0;

  1144.     asf->packet_time_delta = 0;

  1145.     asf->packet_time_start = 0;

  1146. 

  1147.     for(i=0; i<s->nb_streams; i++){

  1148.         asf_st= s->streams[i]->priv_data;

  1149.         av_free_packet(&asf_st->pkt);

  1150.         asf_st->frag_offset=0;

  1151.         asf_st->seq=0;

  1152.     }

  1153.     asf->asf_st= NULL;

  1154. }

  1155. 

  1156. static int asf_read_close(AVFormatContext *s)

  1157. {

  1158.     asf_reset_header(s);

  1159. 

  1160.     return 0;

  1161. }

  1162. 

  1163. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  1164. {

  1165.     AVPacket pkt1, *pkt = &pkt1;

  1166.     ASFStream *asf_st;

  1167.     int64_t pts;

  1168.     int64_t pos= *ppos;

  1169.     int i;

  1170.     int64_t start_pos[ASF_MAX_STREAMS];

  1171. 

  1172.     for(i=0; i<s->nb_streams; i++){

  1173.         start_pos[i]= pos;

  1174.     }

  1175. 

  1176.     if (s->packet_size > 0)

  1177.         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;

  1178.     *ppos= pos;

  1179.     avio_seek(s->pb, pos, SEEK_SET);

  1180. 

  1181. //printf("asf_read_pts\n");

  1182.     asf_reset_header(s);

  1183.     for(;;){

  1184.         if (av_read_frame(s, pkt) < 0){

  1185.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1186.             return AV_NOPTS_VALUE;

  1187.         }

  1188. 

  1189.         pts= pkt->pts;

  1190. 

  1191.         av_free_packet(pkt);

  1192.         if(pkt->flags&AV_PKT_FLAG_KEY){

  1193.             i= pkt->stream_index;

  1194. 

  1195.             asf_st= s->streams[i]->priv_data;

  1196. 

  1197. //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);

  1198.             pos= asf_st->packet_pos;

  1199. 

  1200.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1201.             start_pos[i]= asf_st->packet_pos + 1;

  1202. 

  1203.             if(pkt->stream_index == stream_index)

  1204.                break;

  1205.         }

  1206.     }

  1207. 

  1208.     *ppos= pos;

  1209. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1210. 

  1211.     return pts;

  1212. }

  1213. 

  1214. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1215. {

  1216.     ff_asf_guid g;

  1217.     ASFContext *asf = s->priv_data;

  1218.     int64_t current_pos= avio_tell(s->pb);

  1219.     int i;

  1220. 

  1221.     avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);

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

  1223. 

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

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

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

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

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

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

  1230.             return;

  1231.         }

  1232.         avio_skip(s->pb, gsize-24);

  1233.         ff_get_guid(s->pb, &g);

  1234.     }

  1235. 

  1236.     {

  1237.         int64_t itime, last_pos=-1;

  1238.         int pct, ict;

  1239.         int64_t av_unused gsize= avio_rl64(s->pb);

  1240.         ff_get_guid(s->pb, &g);

  1241.         itime=avio_rl64(s->pb);

  1242.         pct=avio_rl32(s->pb);

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

  1244.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1245. 

  1246.         for (i=0;i<ict;i++){

  1247.             int pktnum=avio_rl32(s->pb);

  1248.             int pktct =avio_rl16(s->pb);

  1249.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1250.             int64_t index_pts= FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);

  1251. 

  1252.             if(pos != last_pos){

  1253.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d  pts: %"PRId64"\n", pktnum, pktct, index_pts);

  1254.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1255.             last_pos=pos;

  1256.             }

  1257.         }

  1258.         asf->index_read= 1;

  1259.     }

  1260.     avio_seek(s->pb, current_pos, SEEK_SET);

  1261. }

  1262. 

  1263. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1264. {

  1265.     ASFContext *asf = s->priv_data;

  1266.     AVStream *st = s->streams[stream_index];

  1267.     int64_t pos;

  1268.     int index;

  1269. 

  1270.     if (s->packet_size <= 0)

  1271.         return -1;

  1272. 

  1273.     /* Try using the protocol's read_seek if available */

  1274.     if(s->pb) {

  1275.         int ret = avio_seek_time(s->pb, stream_index, pts, flags);

  1276.         if(ret >= 0)

  1277.             asf_reset_header(s);

  1278.         if (ret != AVERROR(ENOSYS))

  1279.             return ret;

  1280.     }

  1281. 

  1282.     if (!asf->index_read)

  1283.         asf_build_simple_index(s, stream_index);

  1284. 

  1285.     if((asf->index_read && st->index_entries)){

  1286.         index= av_index_search_timestamp(st, pts, flags);

  1287.         if(index >= 0) {

  1288.             /* find the position */

  1289.             pos = st->index_entries[index].pos;

  1290. 

  1291.             /* do the seek */

  1292.             av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1293.             avio_seek(s->pb, pos, SEEK_SET);

  1294.             asf_reset_header(s);

  1295.             return 0;

  1296.         }

  1297.     }

  1298.     /* no index or seeking by index failed */

  1299.     if(av_seek_frame_binary(s, stream_index, pts, flags)<0)

  1300.         return -1;

  1301.     asf_reset_header(s);

  1302.     return 0;

  1303. }

  1304. 

  1305. AVInputFormat ff_asf_demuxer = {

  1306.     "asf",

  1307.     NULL_IF_CONFIG_SMALL("ASF format"),

  1308.     sizeof(ASFContext),

  1309.     asf_probe,

  1310.     asf_read_header,

  1311.     asf_read_packet,

  1312.     asf_read_close,

  1313.     asf_read_seek,

  1314.     asf_read_pts,

  1315.     .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,

  1316. };