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FFmpeg/libavformat/asfdec.c

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  1. /*

  2.  * ASF compatible demuxer

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

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. //#define DEBUG

  23. 

  24. #include "libavutil/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. #undef NDEBUG

  36. #include <assert.h>

  37. 

  38. #define ASF_MAX_STREAMS 127

  39. #define FRAME_HEADER_SIZE 17

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

  41. 

  42. static const ff_asf_guid index_guid = {

  43.     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb

  44. };

  45. 

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

  47.     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2

  48. };

  49. /**********************************/

  50. /* decoding */

  51. 

  52. int ff_guidcmp(const void *g1, const void *g2)

  53. {

  54.     return memcmp(g1, g2, sizeof(ff_asf_guid));

  55. }

  56. 

  57. #ifdef DEBUG

  58. #define PRINT_IF_GUID(g,cmp) \

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

  60.     dprintf(NULL, "(GUID: %s) ", #cmp)

  61. 

  62. static void print_guid(const ff_asf_guid *g)

  63. {

  64.     int i;

  65.     PRINT_IF_GUID(g, ff_asf_header);

  66.     else PRINT_IF_GUID(g, ff_asf_file_header);

  67.     else PRINT_IF_GUID(g, ff_asf_stream_header);

  68.     else PRINT_IF_GUID(g, ff_asf_audio_stream);

  69.     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);

  70.     else PRINT_IF_GUID(g, ff_asf_video_stream);

  71.     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);

  72.     else PRINT_IF_GUID(g, ff_asf_command_stream);

  73.     else PRINT_IF_GUID(g, ff_asf_comment_header);

  74.     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);

  75.     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);

  76.     else PRINT_IF_GUID(g, ff_asf_data_header);

  77.     else PRINT_IF_GUID(g, index_guid);

  78.     else PRINT_IF_GUID(g, ff_asf_head1_guid);

  79.     else PRINT_IF_GUID(g, ff_asf_head2_guid);

  80.     else PRINT_IF_GUID(g, ff_asf_my_guid);

  81.     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);

  82.     else PRINT_IF_GUID(g, ff_asf_extended_content_header);

  83.     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);

  84.     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);

  85.     else PRINT_IF_GUID(g, ff_asf_metadata_header);

  86.     else PRINT_IF_GUID(g, ff_asf_marker_header);

  87.     else PRINT_IF_GUID(g, stream_bitrate_guid);

  88.     else PRINT_IF_GUID(g, ff_asf_language_guid);

  89.     else

  90.         dprintf(NULL, "(GUID: unknown) ");

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

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

  93.     dprintf(NULL, "}\n");

  94. }

  95. #undef PRINT_IF_GUID

  96. #else

  97. #define print_guid(g)

  98. #endif

  99. 

  100. void ff_get_guid(ByteIOContext *s, ff_asf_guid *g)

  101. {

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

  103.     get_buffer(s, *g, sizeof(*g));

  104. }

  105. 

  106. static int asf_probe(AVProbeData *pd)

  107. {

  108.     /* check file header */

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

  110.         return AVPROBE_SCORE_MAX;

  111.     else

  112.         return 0;

  113. }

  114. 

  115. static int get_value(ByteIOContext *pb, int type){

  116.     switch(type){

  117.         case 2: return get_le32(pb);

  118.         case 3: return get_le32(pb);

  119.         case 4: return get_le64(pb);

  120.         case 5: return get_le16(pb);

  121.         default:return INT_MIN;

  122.     }

  123. }

  124. 

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

  126. {

  127.     char *value;

  128. 

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

  130.         return;

  131. 

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

  133.     if (!value)

  134.         return;

  135. 

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

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

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

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

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

  141.     } else {

  142.         url_fskip(s->pb, len);

  143.         av_freep(&value);

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

  145.         return;

  146.     }

  147.     av_metadata_set2(&s->metadata, key, value, 0);

  148.     av_freep(&value);

  149. }

  150. 

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

  152. {

  153.     ASFContext *asf = s->priv_data;

  154.     ff_asf_guid g;

  155.     ByteIOContext *pb = s->pb;

  156.     AVStream *st;

  157.     ASFStream *asf_st;

  158.     int size, i;

  159.     int64_t gsize;

  160.     AVRational dar[128];

  161.     uint32_t bitrate[128];

  162. 

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

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

  165. 

  166.     ff_get_guid(pb, &g);

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

  168.         return -1;

  169.     get_le64(pb);

  170.     get_le32(pb);

  171.     get_byte(pb);

  172.     get_byte(pb);

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

  174.     for(;;) {

  175.         uint64_t gpos= url_ftell(pb);

  176.         int ret;

  177.         ff_get_guid(pb, &g);

  178.         gsize = get_le64(pb);

  179.         dprintf(s, "%08"PRIx64": ", gpos);

  180.         print_guid(&g);

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

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

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

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

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

  186.                 asf->data_object_size = gsize - 24;

  187.             } else {

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

  189.             }

  190.             break;

  191.         }

  192.         if (gsize < 24)

  193.             return -1;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  209.             enum AVMediaType type;

  210.             int type_specific_size, sizeX;

  211.             uint64_t total_size;

  212.             unsigned int tag1;

  213.             int64_t pos1, pos2, start_time;

  214.             int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  215. 

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

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

  218.                 return AVERROR(EINVAL);

  219.             }

  220. 

  221.             pos1 = url_ftell(pb);

  222. 

  223.             st = av_new_stream(s, 0);

  224.             if (!st)

  225.                 return AVERROR(ENOMEM);

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

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

  228.             if (!asf_st)

  229.                 return AVERROR(ENOMEM);

  230.             st->priv_data = asf_st;

  231.             start_time = asf->hdr.preroll;

  232. 

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

  234. 

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

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

  237.                     (10000000 / 1000) - start_time;

  238.             }

  239.             ff_get_guid(pb, &g);

  240. 

  241.             test_for_ext_stream_audio = 0;

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

  243.                 type = AVMEDIA_TYPE_AUDIO;

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

  245.                 type = AVMEDIA_TYPE_VIDEO;

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

  247.                 type = AVMEDIA_TYPE_VIDEO;

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

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

  250.                 type = AVMEDIA_TYPE_DATA;

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

  252.                 test_for_ext_stream_audio = 1;

  253.                 type = AVMEDIA_TYPE_UNKNOWN;

  254.             } else {

  255.                 return -1;

  256.             }

  257.             ff_get_guid(pb, &g);

  258.             total_size = get_le64(pb);

  259.             type_specific_size = get_le32(pb);

  260.             get_le32(pb);

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

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

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

  264. 

  265.             get_le32(pb);

  266. 

  267.             if (test_for_ext_stream_audio) {

  268.                 ff_get_guid(pb, &g);

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

  270.                     type = AVMEDIA_TYPE_AUDIO;

  271.                     is_dvr_ms_audio=1;

  272.                     ff_get_guid(pb, &g);

  273.                     get_le32(pb);

  274.                     get_le32(pb);

  275.                     get_le32(pb);

  276.                     ff_get_guid(pb, &g);

  277.                     get_le32(pb);

  278.                 }

  279.             }

  280. 

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

  282.             if (type == AVMEDIA_TYPE_AUDIO) {

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

  284.                 if (is_dvr_ms_audio) {

  285.                     // codec_id and codec_tag are unreliable in dvr_ms

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

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

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

  289.                 }

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

  291.                     st->need_parsing = AVSTREAM_PARSE_NONE;

  292.                 } else {

  293.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  294.                 }

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

  296.                 pos2 = url_ftell(pb);

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

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

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

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

  301.                     get_le16(pb); //ds_data_size

  302.                     get_byte(pb); //ds_silence_data

  303.                 }

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

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

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

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

  308.                     if (!asf_st->ds_chunk_size

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

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

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

  312.                 }

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

  314.                 case CODEC_ID_MP3:

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

  316.                     break;

  317.                 case CODEC_ID_PCM_S16LE:

  318.                 case CODEC_ID_PCM_S16BE:

  319.                 case CODEC_ID_PCM_U16LE:

  320.                 case CODEC_ID_PCM_U16BE:

  321.                 case CODEC_ID_PCM_S8:

  322.                 case CODEC_ID_PCM_U8:

  323.                 case CODEC_ID_PCM_ALAW:

  324.                 case CODEC_ID_PCM_MULAW:

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

  326.                     break;

  327.                 default:

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

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

  330.                     break;

  331.                 }

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

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

  334.                 get_le32(pb);

  335.                 get_le32(pb);

  336.                 get_byte(pb);

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

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

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

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

  341.                 /* not available for asf */

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

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

  344.                 tag1 = get_le32(pb);

  345.                 url_fskip(pb, 20);

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

  347.                 size= sizeX;

  348.                 if (size > 40) {

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

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

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

  352.                 }

  353. 

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

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

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

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

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

  359. #if HAVE_BIGENDIAN

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

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

  362. #else

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

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

  365. #endif

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

  367.                 }

  368. 

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

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

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

  372.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  373.                     // 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

  374.                     st->codec->width  =

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

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

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

  378.                 }

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

  380.                     st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;

  381.             }

  382.             pos2 = url_ftell(pb);

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

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

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

  386. 

  387.             len1 = get_le16(pb);

  388.             len2 = get_le16(pb);

  389.             len3 = get_le16(pb);

  390.             len4 = get_le16(pb);

  391.             len5 = get_le16(pb);

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

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

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

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

  396.             url_fskip(pb, len5);

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

  398.             int stream_count = get_le16(pb);

  399.             int j;

  400. 

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

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

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

  404.                 int flags, bitrate, stream_id;

  405. 

  406.                 flags= get_le16(pb);

  407.                 bitrate= get_le32(pb);

  408.                 stream_id= (flags & 0x7f);

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

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

  411.             }

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

  413.             int j;

  414.             int stream_count = get_le16(pb);

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

  416.                 char lang[6];

  417.                 unsigned int lang_len = get_byte(pb);

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

  419.                     url_fskip(pb, lang_len - ret);

  420.                 if (j < 128)

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

  422.             }

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

  424.             int desc_count, i;

  425. 

  426.             desc_count = get_le16(pb);

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

  428.                     int name_len,value_type,value_len;

  429.                     char name[1024];

  430. 

  431.                     name_len = get_le16(pb);

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

  433.                         name_len += 1;

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

  435.                         url_fskip(pb, name_len - ret);

  436.                     value_type = get_le16(pb);

  437.                     value_len  = get_le16(pb);

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

  439.                         value_len += 1;

  440.                     /**

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

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

  443.                      */

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

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

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

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

  448.                     } else

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

  450.             }

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

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

  453.             n = get_le16(pb);

  454. 

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

  456.                 char name[1024];

  457. 

  458.                 get_le16(pb); //lang_list_index

  459.                 stream_num= get_le16(pb);

  460.                 name_len=   get_le16(pb);

  461.                 value_type= get_le16(pb);

  462.                 value_len=  get_le32(pb);

  463. 

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

  465.                     url_fskip(pb, name_len - ret);

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

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

  468.                 url_fskip(pb, value_len - 2);

  469. 

  470.                 if(stream_num<128){

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

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

  473.                 }

  474.             }

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

  476.             int ext_len, payload_ext_ct, stream_ct;

  477.             uint32_t ext_d, leak_rate, stream_num;

  478.             unsigned int stream_languageid_index;

  479. 

  480.             get_le64(pb); // starttime

  481.             get_le64(pb); // endtime

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

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

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

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

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

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

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

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

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

  491. 

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

  493.             if (stream_num < 128)

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

  495. 

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

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

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

  499. 

  500.             if (stream_num < 128)

  501.                 bitrate[stream_num] = leak_rate;

  502. 

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

  504.                 get_le16(pb);

  505.                 ext_len = get_le16(pb);

  506.                 url_fseek(pb, ext_len, SEEK_CUR);

  507.             }

  508. 

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

  510.                 ff_get_guid(pb, &g);

  511.                 ext_d=get_le16(pb);

  512.                 ext_len=get_le32(pb);

  513.                 url_fseek(pb, ext_len, SEEK_CUR);

  514.             }

  515. 

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

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

  518.             continue;

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

  520.             int v1, v2;

  521.             ff_get_guid(pb, &g);

  522.             v1 = get_le32(pb);

  523.             v2 = get_le16(pb);

  524.             continue;

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

  526.             int i, count, name_len;

  527.             char name[1024];

  528. 

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

  530.             get_le64(pb);            // ...

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

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

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

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

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

  536.             }

  537. 

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

  539.                 int64_t pres_time;

  540.                 int name_len;

  541. 

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

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

  544.                 get_le16(pb);             // entry length

  545.                 get_le32(pb);             // send time

  546.                 get_le32(pb);             // flags

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

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

  549.                     url_fskip(pb, name_len - ret);

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

  551.             }

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

  553.             return -1;

  554.         } else {

  555.             if (!s->keylen) {

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

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

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

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

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

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

  562.                 }

  563.             }

  564.         }

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

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

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

  568.     }

  569.     ff_get_guid(pb, &g);

  570.     get_le64(pb);

  571.     get_byte(pb);

  572.     get_byte(pb);

  573.     if (url_feof(pb))

  574.         return -1;

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

  576.     asf->packet_size_left = 0;

  577. 

  578. 

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

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

  581.         if(stream_num>=0){

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

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

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

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

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

  587.                           &st->sample_aspect_ratio.den,

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

  589.             } 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.

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

  591.                           &st->sample_aspect_ratio.den,

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

  593. 

  594. //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);

  595. 

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

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

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

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

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

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

  602.                     if (iso6392)

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

  604.                 }

  605.             }

  606.         }

  607.     }

  608. 

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

  610. 

  611.     return 0;

  612. }

  613. 

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

  615.     switch (bits & 3) \

  616.     { \

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

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

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

  620.     default: var = defval; break; \

  621.     }

  622. 

  623. /**

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

  625.  * @param s demux context

  626.  * @param pb context to read data from

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

  628.  */

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

  630. {

  631.     ASFContext *asf = s->priv_data;

  632.     uint32_t packet_length, padsize;

  633.     int rsize = 8;

  634.     int c, d, e, off;

  635. 

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

  637.     off= 32768;

  638.     if (s->packet_size > 0)

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

  640. 

  641.     c=d=e=-1;

  642.     while(off-- > 0){

  643.         c=d; d=e;

  644.         e= get_byte(pb);

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

  646.             break;

  647.     }

  648. 

  649.     if (c != 0x82) {

  650.         /**

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

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

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

  654.          * the stream.

  655.          */

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

  657.             return AVERROR(EAGAIN);

  658.         if (!url_feof(pb))

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

  660.     }

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

  662.         if (d || e) {

  663.             if (!url_feof(pb))

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

  665.             return -1;

  666.         }

  667.         c= get_byte(pb);

  668.         d= get_byte(pb);

  669.         rsize+=3;

  670.     }else{

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

  672.     }

  673. 

  674.     asf->packet_flags    = c;

  675.     asf->packet_property = d;

  676. 

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

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

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

  680. 

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

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

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

  684.         return -1;

  685.     }

  686.     if(padsize >= packet_length){

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

  688.         return -1;

  689.     }

  690. 

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

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

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

  694. 

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

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

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

  698.     } else {

  699.         asf->packet_segments = 1;

  700.         asf->packet_segsizetype = 0x80;

  701.     }

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

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

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

  705.     asf->packet_padsize = padsize;

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

  707.     return 0;

  708. }

  709. 

  710. /**

  711.  *

  712.  * @return <0 if error

  713.  */

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

  715.     ASFContext *asf = s->priv_data;

  716.     int rsize = 1;

  717.     int num = get_byte(pb);

  718.     int64_t ts0, ts1;

  719. 

  720.     asf->packet_segments--;

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

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

  723.     // sequence should be ignored!

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

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

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

  727. //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);

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

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

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

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

  732.             return -1;

  733.         }

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

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

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

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

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

  739.             url_fskip(pb, 10);

  740.             ts0= get_le64(pb);

  741.             ts1= get_le64(pb);

  742.             url_fskip(pb, 12);

  743.             get_le32(pb);

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

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

  746.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  747.         }else

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

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

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

  751.         // multipacket - frag_offset is beginning timestamp

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

  753.         asf->packet_frag_offset = 0;

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

  755. 

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

  757.         rsize++;

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

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

  760.         return -1;

  761.     }

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

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

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

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

  766.             return -1;

  767.         }

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

  769.     } else {

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

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

  772.     }

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

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

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

  776.             return -1;

  777.     }

  778.     asf->packet_size_left -= rsize;

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

  780. 

  781.     return 0;

  782. }

  783. 

  784. /**

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

  786.  * with asf_get_packet()).

  787.  * @param s demux context

  788.  * @param pb context to read data from

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

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

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

  792.  */

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

  794. {

  795.     ASFContext *asf = s->priv_data;

  796.     ASFStream *asf_st = 0;

  797.     for (;;) {

  798.         int ret;

  799.         if(url_feof(pb))

  800.             return AVERROR_EOF;

  801.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  806.             assert(ret>=0);

  807.             /* fail safe */

  808.             url_fskip(pb, ret);

  809. 

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

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

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

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

  814.             return 1;

  815.         }

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

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

  818.                 asf->packet_segments= 0;

  819.                 continue;

  820.             }

  821.             if (asf->stream_index < 0

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

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

  824.                 ) {

  825.                 asf->packet_time_start = 0;

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

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

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

  829.                 if(asf->stream_index < 0)

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

  831.                 continue;

  832.             }

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

  834.         }

  835.         asf_st = asf->asf_st;

  836. 

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

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

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

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

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

  842.             asf->packet_size_left--;

  843.             asf->packet_multi_size--;

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

  845.             {

  846.                 asf->packet_time_start = 0;

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

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

  849.                 continue;

  850.             }

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

  852.             //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);

  853.         }

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

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

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

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

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

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

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

  861.         }

  862. 

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

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

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

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

  867.                 asf_st->frag_offset = 0;

  868.                 av_free_packet(&asf_st->pkt);

  869.             }

  870.             /* new packet */

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

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

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

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

  875.             asf_st->pkt.pos =

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

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

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

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

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

  881.                 asf->packet_key_frame = 1;

  882.             if (asf->packet_key_frame)

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

  884.         }

  885. 

  886.         /* read data */

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

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

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

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

  891.         if (asf->packet_size_left < 0)

  892.             continue;

  893. 

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

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

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

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

  898.             continue;

  899.         }

  900. 

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

  902.                          asf->packet_frag_size);

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

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

  905.                 return ret < 0 ? ret : AVERROR_EOF;

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

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

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

  909.                 // fragment?

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

  911.                        asf->packet_frag_size - ret);

  912.                 ret = asf->packet_frag_size;

  913.             } else

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

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

  916.         }

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

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

  919.                             ret);

  920.         asf_st->frag_offset += ret;

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

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

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

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

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

  926.                 int i;

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

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

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

  930.                     asf_st->frag_offset = 0;

  931.                     av_free_packet(&asf_st->pkt);

  932.                     continue;

  933.                 }

  934.             }

  935. 

  936.             /* return packet */

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

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

  939.                     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);

  940.               }else{

  941.                 /* packet descrambling */

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

  943.                 if (newdata) {

  944.                     int offset = 0;

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

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

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

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

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

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

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

  952. 

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

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

  955.                         memcpy(newdata + offset,

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

  957.                                asf_st->ds_chunk_size);

  958.                         offset += asf_st->ds_chunk_size;

  959.                     }

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

  961.                     asf_st->pkt.data = newdata;

  962.                 }

  963.               }

  964.             }

  965.             asf_st->frag_offset = 0;

  966.             *pkt= asf_st->pkt;

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

  968.             asf_st->pkt.size = 0;

  969.             asf_st->pkt.data = 0;

  970.             break; // packet completed

  971.         }

  972.     }

  973.     return 0;

  974. }

  975. 

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

  977. {

  978.     ASFContext *asf = s->priv_data;

  979. 

  980.     for (;;) {

  981.         int ret;

  982. 

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

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

  985.             return ret;

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

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

  988.         asf->packet_time_start = 0;

  989.     }

  990. 

  991.     return 0;

  992. }

  993. 

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

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

  996. // leftover information from previous reads

  997. static void asf_reset_header(AVFormatContext *s)

  998. {

  999.     ASFContext *asf = s->priv_data;

  1000.     ASFStream *asf_st;

  1001.     int i;

  1002. 

  1003.     asf->packet_nb_frames = 0;

  1004.     asf->packet_size_left = 0;

  1005.     asf->packet_segments = 0;

  1006.     asf->packet_flags = 0;

  1007.     asf->packet_property = 0;

  1008.     asf->packet_timestamp = 0;

  1009.     asf->packet_segsizetype = 0;

  1010.     asf->packet_segments = 0;

  1011.     asf->packet_seq = 0;

  1012.     asf->packet_replic_size = 0;

  1013.     asf->packet_key_frame = 0;

  1014.     asf->packet_padsize = 0;

  1015.     asf->packet_frag_offset = 0;

  1016.     asf->packet_frag_size = 0;

  1017.     asf->packet_frag_timestamp = 0;

  1018.     asf->packet_multi_size = 0;

  1019.     asf->packet_obj_size = 0;

  1020.     asf->packet_time_delta = 0;

  1021.     asf->packet_time_start = 0;

  1022. 

  1023.     for(i=0; i<s->nb_streams; i++){

  1024.         asf_st= s->streams[i]->priv_data;

  1025.         av_free_packet(&asf_st->pkt);

  1026.         asf_st->frag_offset=0;

  1027.         asf_st->seq=0;

  1028.     }

  1029.     asf->asf_st= NULL;

  1030. }

  1031. 

  1032. static int asf_read_close(AVFormatContext *s)

  1033. {

  1034.     int i;

  1035. 

  1036.     asf_reset_header(s);

  1037.     for(i=0;i<s->nb_streams;i++) {

  1038.         AVStream *st = s->streams[i];

  1039.         av_free(st->codec->palctrl);

  1040.     }

  1041.     return 0;

  1042. }

  1043. 

  1044. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  1045. {

  1046.     AVPacket pkt1, *pkt = &pkt1;

  1047.     ASFStream *asf_st;

  1048.     int64_t pts;

  1049.     int64_t pos= *ppos;

  1050.     int i;

  1051.     int64_t start_pos[ASF_MAX_STREAMS];

  1052. 

  1053.     for(i=0; i<s->nb_streams; i++){

  1054.         start_pos[i]= pos;

  1055.     }

  1056. 

  1057.     if (s->packet_size > 0)

  1058.         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;

  1059.     *ppos= pos;

  1060.     url_fseek(s->pb, pos, SEEK_SET);

  1061. 

  1062. //printf("asf_read_pts\n");

  1063.     asf_reset_header(s);

  1064.     for(;;){

  1065.         if (av_read_frame(s, pkt) < 0){

  1066.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1067.             return AV_NOPTS_VALUE;

  1068.         }

  1069. 

  1070.         pts= pkt->pts;

  1071. 

  1072.         av_free_packet(pkt);

  1073.         if(pkt->flags&AV_PKT_FLAG_KEY){

  1074.             i= pkt->stream_index;

  1075. 

  1076.             asf_st= s->streams[i]->priv_data;

  1077. 

  1078. //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);

  1079.             pos= asf_st->packet_pos;

  1080. 

  1081.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1082.             start_pos[i]= asf_st->packet_pos + 1;

  1083. 

  1084.             if(pkt->stream_index == stream_index)

  1085.                break;

  1086.         }

  1087.     }

  1088. 

  1089.     *ppos= pos;

  1090. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1091. 

  1092.     return pts;

  1093. }

  1094. 

  1095. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1096. {

  1097.     ff_asf_guid g;

  1098.     ASFContext *asf = s->priv_data;

  1099.     int64_t current_pos= url_ftell(s->pb);

  1100.     int i;

  1101. 

  1102.     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);

  1103.     ff_get_guid(s->pb, &g);

  1104. 

  1105.     /* the data object can be followed by other top-level objects,

  1106.        skip them until the simple index object is reached */

  1107.     while (ff_guidcmp(&g, &index_guid)) {

  1108.         int64_t gsize= get_le64(s->pb);

  1109.         if (gsize < 24 || url_feof(s->pb)) {

  1110.             url_fseek(s->pb, current_pos, SEEK_SET);

  1111.             return;

  1112.         }

  1113.         url_fseek(s->pb, gsize-24, SEEK_CUR);

  1114.         ff_get_guid(s->pb, &g);

  1115.     }

  1116. 

  1117.     {

  1118.         int64_t itime, last_pos=-1;

  1119.         int pct, ict;

  1120.         int64_t av_unused gsize= get_le64(s->pb);

  1121.         ff_get_guid(s->pb, &g);

  1122.         itime=get_le64(s->pb);

  1123.         pct=get_le32(s->pb);

  1124.         ict=get_le32(s->pb);

  1125.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1126. 

  1127.         for (i=0;i<ict;i++){

  1128.             int pktnum=get_le32(s->pb);

  1129.             int pktct =get_le16(s->pb);

  1130.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1131.             int64_t index_pts= av_rescale(itime, i, 10000);

  1132. 

  1133.             if(pos != last_pos){

  1134.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);

  1135.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1136.             last_pos=pos;

  1137.             }

  1138.         }

  1139.         asf->index_read= 1;

  1140.     }

  1141.     url_fseek(s->pb, current_pos, SEEK_SET);

  1142. }

  1143. 

  1144. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1145. {

  1146.     ASFContext *asf = s->priv_data;

  1147.     AVStream *st = s->streams[stream_index];

  1148.     int64_t pos;

  1149.     int index;

  1150. 

  1151.     if (s->packet_size <= 0)

  1152.         return -1;

  1153. 

  1154.     /* Try using the protocol's read_seek if available */

  1155.     if(s->pb) {

  1156.         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);

  1157.         if(ret >= 0)

  1158.             asf_reset_header(s);

  1159.         if (ret != AVERROR(ENOSYS))

  1160.             return ret;

  1161.     }

  1162. 

  1163.     if (!asf->index_read)

  1164.         asf_build_simple_index(s, stream_index);

  1165. 

  1166.     if(!(asf->index_read && st->index_entries)){

  1167.         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)

  1168.             return -1;

  1169.     }else{

  1170.         index= av_index_search_timestamp(st, pts, flags);

  1171.         if(index<0)

  1172.             return -1;

  1173. 

  1174.         /* find the position */

  1175.         pos = st->index_entries[index].pos;

  1176. 

  1177.     // various attempts to find key frame have failed so far

  1178.     //    asf_reset_header(s);

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

  1180.     //    key_pos = pos;

  1181.     //     for(i=0;i<16;i++){

  1182.     //         pos = url_ftell(s->pb);

  1183.     //         if (av_read_frame(s, &pkt) < 0){

  1184.     //             av_log(s, AV_LOG_INFO, "seek failed\n");

  1185.     //             return -1;

  1186.     //         }

  1187.     //         asf_st = s->streams[stream_index]->priv_data;

  1188.     //         pos += st->parser->frame_offset;

  1189.     //

  1190.     //         if (pkt.size > b) {

  1191.     //             b = pkt.size;

  1192.     //             key_pos = pos;

  1193.     //         }

  1194.     //

  1195.     //         av_free_packet(&pkt);

  1196.     //     }

  1197. 

  1198.         /* do the seek */

  1199.         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1200.         url_fseek(s->pb, pos, SEEK_SET);

  1201.     }

  1202.     asf_reset_header(s);

  1203.     return 0;

  1204. }

  1205. 

  1206. AVInputFormat ff_asf_demuxer = {

  1207.     "asf",

  1208.     NULL_IF_CONFIG_SMALL("ASF format"),

  1209.     sizeof(ASFContext),

  1210.     asf_probe,

  1211.     asf_read_header,

  1212.     asf_read_packet,

  1213.     asf_read_close,

  1214.     asf_read_seek,

  1215.     asf_read_pts,

  1216. };