falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
27575 Commits
32 Branches
2.4GB
Tree: aef669cdfd
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from 'aef669cdfd'
${ noResults }
FFmpeg/libavformat/asfdec.c

1254 lines
48KB
Raw Blame History 

  1. /*

  2.  * ASF compatible demuxer

  3.  * Copyright (c) 2000, 2001 Fabrice Bellard

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

  7.  * FFmpeg is free software; you can redistribute it and/or

  8.  * modify it under the terms of the GNU Lesser General Public

  9.  * License as published by the Free Software Foundation; either

  10.  * version 2.1 of the License, or (at your option) any later version.

  11.  *

  12.  * FFmpeg is distributed in the hope that it will be useful,

  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  15.  * Lesser General Public License for more details.

  16.  *

  17.  * You should have received a copy of the GNU Lesser General Public

  18.  * License along with FFmpeg; if not, write to the Free Software

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

  20.  */

  21. 

  22. //#define DEBUG

  23. 

  24. #include "libavutil/common.h"

  25. #include "libavutil/avstring.h"

  26. #include "libavcodec/mpegaudio.h"

  27. #include "avformat.h"

  28. #include "riff.h"

  29. #include "asf.h"

  30. #include "asfcrypt.h"

  31. #include "avlanguage.h"

  32. 

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

  34. 

  35. typedef struct {

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

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

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

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

  40.     /* non streamed additonnal info */

  41.     uint64_t nb_packets;                 ///< how many packets are there in the file, invalid if broadcasting

  42.     /* packet filling */

  43.     int packet_size_left;

  44.     int packet_nb_frames;

  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(ByteIOContext *s, ff_asf_guid *g)

  137. {

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

  139.     get_buffer(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(ByteIOContext *pb, int type){

  152.     switch(type){

  153.         case 2: return get_le32(pb);

  154.         case 3: return get_le32(pb);

  155.         case 4: return get_le64(pb);

  156.         case 5: return get_le16(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 = url_ftell(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.     av_metadata_set2(&s->metadata, key, value, 0);

  183. finish:

  184.     av_freep(&value);

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

  186. }

  187. 

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

  189. {

  190.     ASFContext *asf = s->priv_data;

  191.     ff_asf_guid g;

  192.     ByteIOContext *pb = s->pb;

  193.     AVStream *st;

  194.     ASFStream *asf_st;

  195.     int size, i;

  196.     int64_t gsize;

  197.     AVRational dar[128];

  198.     uint32_t bitrate[128];

  199. 

  200.     memset(dar, 0, sizeof(dar));

  201.     memset(bitrate, 0, sizeof(bitrate));

  202. 

  203.     ff_get_guid(pb, &g);

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

  205.         return -1;

  206.     get_le64(pb);

  207.     get_le32(pb);

  208.     get_byte(pb);

  209.     get_byte(pb);

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

  211.     for(;;) {

  212.         uint64_t gpos= url_ftell(pb);

  213.         int ret;

  214.         ff_get_guid(pb, &g);

  215.         gsize = get_le64(pb);

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

  217.         print_guid(&g);

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

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

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

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

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

  223.                 asf->data_object_size = gsize - 24;

  224.             } else {

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

  226.             }

  227.             break;

  228.         }

  229.         if (gsize < 24)

  230.             return -1;

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

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

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

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

  235.             asf->nb_packets             = get_le64(pb);

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

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

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

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

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

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

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

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

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

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

  246.             enum AVMediaType type;

  247.             int type_specific_size, sizeX;

  248.             uint64_t total_size;

  249.             unsigned int tag1;

  250.             int64_t pos1, pos2, start_time;

  251.             int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  252. 

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

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

  255.                 return AVERROR(EINVAL);

  256.             }

  257. 

  258.             pos1 = url_ftell(pb);

  259. 

  260.             st = av_new_stream(s, 0);

  261.             if (!st)

  262.                 return AVERROR(ENOMEM);

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

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

  265.             if (!asf_st)

  266.                 return AVERROR(ENOMEM);

  267.             st->priv_data = asf_st;

  268.             start_time = asf->hdr.preroll;

  269. 

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

  271. 

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

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

  274.                     (10000000 / 1000) - start_time;

  275.             }

  276.             ff_get_guid(pb, &g);

  277. 

  278.             test_for_ext_stream_audio = 0;

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

  280.                 type = AVMEDIA_TYPE_AUDIO;

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

  282.                 type = AVMEDIA_TYPE_VIDEO;

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

  284.                 type = AVMEDIA_TYPE_VIDEO;

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

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

  287.                 type = AVMEDIA_TYPE_DATA;

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

  289.                 test_for_ext_stream_audio = 1;

  290.                 type = AVMEDIA_TYPE_UNKNOWN;

  291.             } else {

  292.                 return -1;

  293.             }

  294.             ff_get_guid(pb, &g);

  295.             total_size = get_le64(pb);

  296.             type_specific_size = get_le32(pb);

  297.             get_le32(pb);

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

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

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

  301. 

  302.             get_le32(pb);

  303. 

  304.             if (test_for_ext_stream_audio) {

  305.                 ff_get_guid(pb, &g);

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

  307.                     type = AVMEDIA_TYPE_AUDIO;

  308.                     is_dvr_ms_audio=1;

  309.                     ff_get_guid(pb, &g);

  310.                     get_le32(pb);

  311.                     get_le32(pb);

  312.                     get_le32(pb);

  313.                     ff_get_guid(pb, &g);

  314.                     get_le32(pb);

  315.                 }

  316.             }

  317. 

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

  319.             if (type == AVMEDIA_TYPE_AUDIO) {

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

  321.                 if (is_dvr_ms_audio) {

  322.                     // codec_id and codec_tag are unreliable in dvr_ms

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

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

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

  326.                 }

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

  328.                     st->need_parsing = AVSTREAM_PARSE_NONE;

  329.                 } else {

  330.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  331.                 }

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

  333.                 pos2 = url_ftell(pb);

  334.                 if (gsize >= (pos2 + 8 - pos1 + 24)) {

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

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

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

  338.                     get_le16(pb); //ds_data_size

  339.                     get_byte(pb); //ds_silence_data

  340.                 }

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

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

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

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

  345.                     if (!asf_st->ds_chunk_size

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

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

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

  349.                 }

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

  351.                 case CODEC_ID_MP3:

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

  353.                     break;

  354.                 case CODEC_ID_PCM_S16LE:

  355.                 case CODEC_ID_PCM_S16BE:

  356.                 case CODEC_ID_PCM_U16LE:

  357.                 case CODEC_ID_PCM_U16BE:

  358.                 case CODEC_ID_PCM_S8:

  359.                 case CODEC_ID_PCM_U8:

  360.                 case CODEC_ID_PCM_ALAW:

  361.                 case CODEC_ID_PCM_MULAW:

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

  363.                     break;

  364.                 default:

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

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

  367.                     break;

  368.                 }

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

  370.                        gsize - (url_ftell(pb) - pos1 + 24) >= 51) {

  371.                 get_le32(pb);

  372.                 get_le32(pb);

  373.                 get_byte(pb);

  374.                 size = get_le16(pb); /* size */

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

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

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

  378.                 /* not available for asf */

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

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

  381.                 tag1 = get_le32(pb);

  382.                 url_fskip(pb, 20);

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

  384.                 size= sizeX;

  385.                 if (size > 40) {

  386.                     st->codec->extradata_size = size - 40;

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

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

  389.                 }

  390. 

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

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

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

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

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

  396. #if HAVE_BIGENDIAN

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

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

  399. #else

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

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

  402. #endif

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

  404.                 }

  405. 

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

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

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

  409.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  410.                     // 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

  411.                     st->codec->width  =

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

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

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

  415.                 }

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

  417.                     st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;

  418.             }

  419.             pos2 = url_ftell(pb);

  420.             url_fskip(pb, gsize - (pos2 - pos1 + 24));

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

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

  423. 

  424.             len1 = get_le16(pb);

  425.             len2 = get_le16(pb);

  426.             len3 = get_le16(pb);

  427.             len4 = get_le16(pb);

  428.             len5 = get_le16(pb);

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

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

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

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

  433.             url_fskip(pb, len5);

  434.         } else if (!ff_guidcmp(&g, &stream_bitrate_guid)) {

  435.             int stream_count = get_le16(pb);

  436.             int j;

  437. 

  438. //            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");

  439. //            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);

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

  441.                 int flags, bitrate, stream_id;

  442. 

  443.                 flags= get_le16(pb);

  444.                 bitrate= get_le32(pb);

  445.                 stream_id= (flags & 0x7f);

  446. //                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);

  447.                 asf->stream_bitrates[stream_id]= bitrate;

  448.             }

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

  450.             int j;

  451.             int stream_count = get_le16(pb);

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

  453.                 char lang[6];

  454.                 unsigned int lang_len = get_byte(pb);

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

  456.                     url_fskip(pb, lang_len - ret);

  457.                 if (j < 128)

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

  459.             }

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

  461.             int desc_count, i;

  462. 

  463.             desc_count = get_le16(pb);

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

  465.                     int name_len,value_type,value_len;

  466.                     char name[1024];

  467. 

  468.                     name_len = get_le16(pb);

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

  470.                         name_len += 1;

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

  472.                         url_fskip(pb, name_len - ret);

  473.                     value_type = get_le16(pb);

  474.                     value_len  = get_le16(pb);

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

  476.                         value_len += 1;

  477.                     /**

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

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

  480.                      */

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

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

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

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

  485.                     } else

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

  487.             }

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

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

  490.             n = get_le16(pb);

  491. 

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

  493.                 char name[1024];

  494. 

  495.                 get_le16(pb); //lang_list_index

  496.                 stream_num= get_le16(pb);

  497.                 name_len=   get_le16(pb);

  498.                 value_type= get_le16(pb);

  499.                 value_len=  get_le32(pb);

  500. 

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

  502.                     url_fskip(pb, name_len - ret);

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

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

  505.                 url_fskip(pb, value_len - 2);

  506. 

  507.                 if(stream_num<128){

  508.                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;

  509.                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;

  510.                 }

  511.             }

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

  513.             int ext_len, payload_ext_ct, stream_ct;

  514.             uint32_t ext_d, leak_rate, stream_num;

  515.             unsigned int stream_languageid_index;

  516. 

  517.             get_le64(pb); // starttime

  518.             get_le64(pb); // endtime

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

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

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

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

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

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

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

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

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

  528. 

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

  530.             if (stream_num < 128)

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

  532. 

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

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

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

  536. 

  537.             if (stream_num < 128)

  538.                 bitrate[stream_num] = leak_rate;

  539. 

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

  541.                 get_le16(pb);

  542.                 ext_len = get_le16(pb);

  543.                 url_fseek(pb, ext_len, SEEK_CUR);

  544.             }

  545. 

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

  547.                 ff_get_guid(pb, &g);

  548.                 ext_d=get_le16(pb);

  549.                 ext_len=get_le32(pb);

  550.                 url_fseek(pb, ext_len, SEEK_CUR);

  551.             }

  552. 

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

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

  555.             continue;

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

  557.             int v1, v2;

  558.             ff_get_guid(pb, &g);

  559.             v1 = get_le32(pb);

  560.             v2 = get_le16(pb);

  561.             continue;

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

  563.             int i, count, name_len;

  564.             char name[1024];

  565. 

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

  567.             get_le64(pb);            // ...

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

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

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

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

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

  573.             }

  574. 

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

  576.                 int64_t pres_time;

  577.                 int name_len;

  578. 

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

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

  581.                 get_le16(pb);             // entry length

  582.                 get_le32(pb);             // send time

  583.                 get_le32(pb);             // flags

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

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

  586.                     url_fskip(pb, name_len - ret);

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

  588.             }

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

  590.             return -1;

  591.         } else {

  592.             if (!s->keylen) {

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

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

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

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

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

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

  599.                 }

  600.             }

  601.         }

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

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

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

  605.     }

  606.     ff_get_guid(pb, &g);

  607.     get_le64(pb);

  608.     get_byte(pb);

  609.     get_byte(pb);

  610.     if (url_feof(pb))

  611.         return -1;

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

  613.     asf->packet_size_left = 0;

  614. 

  615. 

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

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

  618.         if(stream_num>=0){

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

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

  621.                 st->codec->bit_rate = bitrate[i];

  622.             if (dar[i].num > 0 && dar[i].den > 0){

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

  624.                           &st->sample_aspect_ratio.den,

  625.                           dar[i].num, dar[i].den, INT_MAX);

  626.             } else if ((dar[0].num > 0) && (dar[0].den > 0) && (st->codec->codec_type==AVMEDIA_TYPE_VIDEO)) // Use ASF container value if the stream doesn't AR set.

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

  628.                           &st->sample_aspect_ratio.den,

  629.                           dar[0].num, dar[0].den, INT_MAX);

  630. 

  631. //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);

  632. 

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

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

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

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

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

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

  639.                     if (iso6392)

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

  641.                 }

  642.             }

  643.         }

  644.     }

  645. 

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

  647. 

  648.     return 0;

  649. }

  650. 

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

  652.     switch (bits & 3) \

  653.     { \

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

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

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

  657.     default: var = defval; break; \

  658.     }

  659. 

  660. /**

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

  662.  * @param s demux context

  663.  * @param pb context to read data from

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

  665.  */

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

  667. {

  668.     ASFContext *asf = s->priv_data;

  669.     uint32_t packet_length, padsize;

  670.     int rsize = 8;

  671.     int c, d, e, off;

  672. 

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

  674.     off= 32768;

  675.     if (s->packet_size > 0)

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

  677. 

  678.     c=d=e=-1;

  679.     while(off-- > 0){

  680.         c=d; d=e;

  681.         e= get_byte(pb);

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

  683.             break;

  684.     }

  685. 

  686.     if (c != 0x82) {

  687.         /**

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

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

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

  691.          * the stream.

  692.          */

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

  694.             return AVERROR(EAGAIN);

  695.         if (!url_feof(pb))

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

  697.     }

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

  699.         if (d || e) {

  700.             if (!url_feof(pb))

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

  702.             return -1;

  703.         }

  704.         c= get_byte(pb);

  705.         d= get_byte(pb);

  706.         rsize+=3;

  707.     }else{

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

  709.     }

  710. 

  711.     asf->packet_flags    = c;

  712.     asf->packet_property = d;

  713. 

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

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

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

  717. 

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

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

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

  721.         return -1;

  722.     }

  723.     if(padsize >= packet_length){

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

  725.         return -1;

  726.     }

  727. 

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

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

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

  731. 

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

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

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

  735.     } else {

  736.         asf->packet_segments = 1;

  737.         asf->packet_segsizetype = 0x80;

  738.     }

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

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

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

  742.     asf->packet_padsize = padsize;

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

  744.     return 0;

  745. }

  746. 

  747. /**

  748.  *

  749.  * @return <0 if error

  750.  */

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

  752.     ASFContext *asf = s->priv_data;

  753.     int rsize = 1;

  754.     int num = get_byte(pb);

  755.     int64_t ts0, ts1;

  756. 

  757.     asf->packet_segments--;

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

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

  760.     // sequence should be ignored!

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

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

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

  764. //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);

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

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

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

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

  769.             return -1;

  770.         }

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

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

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

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

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

  776.             url_fskip(pb, 10);

  777.             ts0= get_le64(pb);

  778.             ts1= get_le64(pb);

  779.             url_fskip(pb, 12);

  780.             get_le32(pb);

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

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

  783.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  784.         }else

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

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

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

  788.         // multipacket - frag_offset is beginning timestamp

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

  790.         asf->packet_frag_offset = 0;

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

  792. 

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

  794.         rsize++;

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

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

  797.         return -1;

  798.     }

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

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

  801.         if(asf->packet_frag_size > asf->packet_size_left - rsize){

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

  803.             return -1;

  804.         }

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

  806.     } else {

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

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

  809.     }

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

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

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

  813.             return -1;

  814.     }

  815.     asf->packet_size_left -= rsize;

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

  817. 

  818.     return 0;

  819. }

  820. 

  821. /**

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

  823.  * with asf_get_packet()).

  824.  * @param s demux context

  825.  * @param pb context to read data from

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

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

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

  829.  */

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

  831. {

  832.     ASFContext *asf = s->priv_data;

  833.     ASFStream *asf_st = 0;

  834.     for (;;) {

  835.         int ret;

  836.         if(url_feof(pb))

  837.             return AVERROR_EOF;

  838.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  843.             assert(ret>=0);

  844.             /* fail safe */

  845.             url_fskip(pb, ret);

  846. 

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

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

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

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

  851.             return 1;

  852.         }

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

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

  855.                 asf->packet_segments= 0;

  856.                 continue;

  857.             }

  858.             if (asf->stream_index < 0

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

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

  861.                 ) {

  862.                 asf->packet_time_start = 0;

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

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

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

  866.                 if(asf->stream_index < 0)

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

  868.                 continue;

  869.             }

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

  871.         }

  872.         asf_st = asf->asf_st;

  873. 

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

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

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

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

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

  879.             asf->packet_size_left--;

  880.             asf->packet_multi_size--;

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

  882.             {

  883.                 asf->packet_time_start = 0;

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

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

  886.                 continue;

  887.             }

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

  889.             //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);

  890.         }

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

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

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

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

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

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

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

  898.         }

  899. 

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

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

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

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

  904.                 asf_st->frag_offset = 0;

  905.                 av_free_packet(&asf_st->pkt);

  906.             }

  907.             /* new packet */

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

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

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

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

  912.             asf_st->pkt.pos =

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

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

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

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

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

  918.                 asf->packet_key_frame = 1;

  919.             if (asf->packet_key_frame)

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

  921.         }

  922. 

  923.         /* read data */

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

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

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

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

  928.         if (asf->packet_size_left < 0)

  929.             continue;

  930. 

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

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

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

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

  935.             continue;

  936.         }

  937. 

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

  939.                          asf->packet_frag_size);

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

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

  942.                 return ret < 0 ? ret : AVERROR_EOF;

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

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

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

  946.                 // fragment?

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

  948.                        asf->packet_frag_size - ret);

  949.                 ret = asf->packet_frag_size;

  950.             } else

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

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

  953.         }

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

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

  956.                             ret);

  957.         asf_st->frag_offset += ret;

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

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

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

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

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

  963.                 int i;

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

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

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

  967.                     asf_st->frag_offset = 0;

  968.                     av_free_packet(&asf_st->pkt);

  969.                     continue;

  970.                 }

  971.             }

  972. 

  973.             /* return packet */

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

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

  976.                     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);

  977.               }else{

  978.                 /* packet descrambling */

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

  980.                 if (newdata) {

  981.                     int offset = 0;

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

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

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

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

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

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

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

  989. 

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

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

  992.                         memcpy(newdata + offset,

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

  994.                                asf_st->ds_chunk_size);

  995.                         offset += asf_st->ds_chunk_size;

  996.                     }

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

  998.                     asf_st->pkt.data = newdata;

  999.                 }

  1000.               }

  1001.             }

  1002.             asf_st->frag_offset = 0;

  1003.             *pkt= asf_st->pkt;

  1004.             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);

  1005.             asf_st->pkt.size = 0;

  1006.             asf_st->pkt.data = 0;

  1007.             break; // packet completed

  1008.         }

  1009.     }

  1010.     return 0;

  1011. }

  1012. 

  1013. static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)

  1014. {

  1015.     ASFContext *asf = s->priv_data;

  1016. 

  1017.     for (;;) {

  1018.         int ret;

  1019. 

  1020.         /* parse cached packets, if any */

  1021.         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)

  1022.             return ret;

  1023.         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)

  1024.             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);

  1025.         asf->packet_time_start = 0;

  1026.     }

  1027. 

  1028.     return 0;

  1029. }

  1030. 

  1031. // Added to support seeking after packets have been read

  1032. // If information is not reset, read_packet fails due to

  1033. // leftover information from previous reads

  1034. static void asf_reset_header(AVFormatContext *s)

  1035. {

  1036.     ASFContext *asf = s->priv_data;

  1037.     ASFStream *asf_st;

  1038.     int i;

  1039. 

  1040.     asf->packet_nb_frames = 0;

  1041.     asf->packet_size_left = 0;

  1042.     asf->packet_segments = 0;

  1043.     asf->packet_flags = 0;

  1044.     asf->packet_property = 0;

  1045.     asf->packet_timestamp = 0;

  1046.     asf->packet_segsizetype = 0;

  1047.     asf->packet_segments = 0;

  1048.     asf->packet_seq = 0;

  1049.     asf->packet_replic_size = 0;

  1050.     asf->packet_key_frame = 0;

  1051.     asf->packet_padsize = 0;

  1052.     asf->packet_frag_offset = 0;

  1053.     asf->packet_frag_size = 0;

  1054.     asf->packet_frag_timestamp = 0;

  1055.     asf->packet_multi_size = 0;

  1056.     asf->packet_obj_size = 0;

  1057.     asf->packet_time_delta = 0;

  1058.     asf->packet_time_start = 0;

  1059. 

  1060.     for(i=0; i<s->nb_streams; i++){

  1061.         asf_st= s->streams[i]->priv_data;

  1062.         av_free_packet(&asf_st->pkt);

  1063.         asf_st->frag_offset=0;

  1064.         asf_st->seq=0;

  1065.     }

  1066.     asf->asf_st= NULL;

  1067. }

  1068. 

  1069. static int asf_read_close(AVFormatContext *s)

  1070. {

  1071.     int i;

  1072. 

  1073.     asf_reset_header(s);

  1074.     for(i=0;i<s->nb_streams;i++) {

  1075.         AVStream *st = s->streams[i];

  1076.         av_free(st->codec->palctrl);

  1077.     }

  1078.     return 0;

  1079. }

  1080. 

  1081. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  1082. {

  1083.     AVPacket pkt1, *pkt = &pkt1;

  1084.     ASFStream *asf_st;

  1085.     int64_t pts;

  1086.     int64_t pos= *ppos;

  1087.     int i;

  1088.     int64_t start_pos[ASF_MAX_STREAMS];

  1089. 

  1090.     for(i=0; i<s->nb_streams; i++){

  1091.         start_pos[i]= pos;

  1092.     }

  1093. 

  1094.     if (s->packet_size > 0)

  1095.         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;

  1096.     *ppos= pos;

  1097.     url_fseek(s->pb, pos, SEEK_SET);

  1098. 

  1099. //printf("asf_read_pts\n");

  1100.     asf_reset_header(s);

  1101.     for(;;){

  1102.         if (av_read_frame(s, pkt) < 0){

  1103.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1104.             return AV_NOPTS_VALUE;

  1105.         }

  1106. 

  1107.         pts= pkt->pts;

  1108. 

  1109.         av_free_packet(pkt);

  1110.         if(pkt->flags&AV_PKT_FLAG_KEY){

  1111.             i= pkt->stream_index;

  1112. 

  1113.             asf_st= s->streams[i]->priv_data;

  1114. 

  1115. //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);

  1116.             pos= asf_st->packet_pos;

  1117. 

  1118.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1119.             start_pos[i]= asf_st->packet_pos + 1;

  1120. 

  1121.             if(pkt->stream_index == stream_index)

  1122.                break;

  1123.         }

  1124.     }

  1125. 

  1126.     *ppos= pos;

  1127. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1128. 

  1129.     return pts;

  1130. }

  1131. 

  1132. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1133. {

  1134.     ff_asf_guid g;

  1135.     ASFContext *asf = s->priv_data;

  1136.     int64_t current_pos= url_ftell(s->pb);

  1137.     int i;

  1138. 

  1139.     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);

  1140.     ff_get_guid(s->pb, &g);

  1141. 

  1142.     /* the data object can be followed by other top-level objects,

  1143.        skip them until the simple index object is reached */

  1144.     while (ff_guidcmp(&g, &index_guid)) {

  1145.         int64_t gsize= get_le64(s->pb);

  1146.         if (gsize < 24 || url_feof(s->pb)) {

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

  1148.             return;

  1149.         }

  1150.         url_fseek(s->pb, gsize-24, SEEK_CUR);

  1151.         ff_get_guid(s->pb, &g);

  1152.     }

  1153. 

  1154.     {

  1155.         int64_t itime, last_pos=-1;

  1156.         int pct, ict;

  1157.         int64_t av_unused gsize= get_le64(s->pb);

  1158.         ff_get_guid(s->pb, &g);

  1159.         itime=get_le64(s->pb);

  1160.         pct=get_le32(s->pb);

  1161.         ict=get_le32(s->pb);

  1162.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1163. 

  1164.         for (i=0;i<ict;i++){

  1165.             int pktnum=get_le32(s->pb);

  1166.             int pktct =get_le16(s->pb);

  1167.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1168.             int64_t index_pts= av_rescale(itime, i, 10000);

  1169. 

  1170.             if(pos != last_pos){

  1171.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);

  1172.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1173.             last_pos=pos;

  1174.             }

  1175.         }

  1176.         asf->index_read= 1;

  1177.     }

  1178.     url_fseek(s->pb, current_pos, SEEK_SET);

  1179. }

  1180. 

  1181. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1182. {

  1183.     ASFContext *asf = s->priv_data;

  1184.     AVStream *st = s->streams[stream_index];

  1185.     int64_t pos;

  1186.     int index;

  1187. 

  1188.     if (s->packet_size <= 0)

  1189.         return -1;

  1190. 

  1191.     /* Try using the protocol's read_seek if available */

  1192.     if(s->pb) {

  1193.         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);

  1194.         if(ret >= 0)

  1195.             asf_reset_header(s);

  1196.         if (ret != AVERROR(ENOSYS))

  1197.             return ret;

  1198.     }

  1199. 

  1200.     if (!asf->index_read)

  1201.         asf_build_simple_index(s, stream_index);

  1202. 

  1203.     if(!(asf->index_read && st->index_entries)){

  1204.         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)

  1205.             return -1;

  1206.     }else{

  1207.         index= av_index_search_timestamp(st, pts, flags);

  1208.         if(index<0)

  1209.             return -1;

  1210. 

  1211.         /* find the position */

  1212.         pos = st->index_entries[index].pos;

  1213. 

  1214.     // various attempts to find key frame have failed so far

  1215.     //    asf_reset_header(s);

  1216.     //    url_fseek(s->pb, pos, SEEK_SET);

  1217.     //    key_pos = pos;

  1218.     //     for(i=0;i<16;i++){

  1219.     //         pos = url_ftell(s->pb);

  1220.     //         if (av_read_frame(s, &pkt) < 0){

  1221.     //             av_log(s, AV_LOG_INFO, "seek failed\n");

  1222.     //             return -1;

  1223.     //         }

  1224.     //         asf_st = s->streams[stream_index]->priv_data;

  1225.     //         pos += st->parser->frame_offset;

  1226.     //

  1227.     //         if (pkt.size > b) {

  1228.     //             b = pkt.size;

  1229.     //             key_pos = pos;

  1230.     //         }

  1231.     //

  1232.     //         av_free_packet(&pkt);

  1233.     //     }

  1234. 

  1235.         /* do the seek */

  1236.         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1237.         url_fseek(s->pb, pos, SEEK_SET);

  1238.     }

  1239.     asf_reset_header(s);

  1240.     return 0;

  1241. }

  1242. 

  1243. AVInputFormat ff_asf_demuxer = {

  1244.     "asf",

  1245.     NULL_IF_CONFIG_SMALL("ASF format"),

  1246.     sizeof(ASFContext),

  1247.     asf_probe,

  1248.     asf_read_header,

  1249.     asf_read_packet,

  1250.     asf_read_close,

  1251.     asf_read_seek,

  1252.     asf_read_pts,

  1253. };