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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 FRAME_HEADER_SIZE 17

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

  40. 

  41. static const ff_asf_guid index_guid = {

  42.     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb

  43. };

  44. 

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

  46.     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2

  47. };

  48. /**********************************/

  49. /* decoding */

  50. 

  51. static int guidcmp(const void *g1, const void *g2)

  52. {

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

  54. }

  55. 

  56. #ifdef DEBUG

  57. #define PRINT_IF_GUID(g,cmp) \

  58. if (!guidcmp(g, &cmp)) \

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

  60. 

  61. static void print_guid(const ff_asf_guid *g)

  62. {

  63.     int i;

  64.     PRINT_IF_GUID(g, ff_asf_header);

  65.     else PRINT_IF_GUID(g, ff_asf_file_header);

  66.     else PRINT_IF_GUID(g, ff_asf_stream_header);

  67.     else PRINT_IF_GUID(g, ff_asf_audio_stream);

  68.     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);

  69.     else PRINT_IF_GUID(g, ff_asf_video_stream);

  70.     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);

  71.     else PRINT_IF_GUID(g, ff_asf_command_stream);

  72.     else PRINT_IF_GUID(g, ff_asf_comment_header);

  73.     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);

  74.     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);

  75.     else PRINT_IF_GUID(g, ff_asf_data_header);

  76.     else PRINT_IF_GUID(g, index_guid);

  77.     else PRINT_IF_GUID(g, ff_asf_head1_guid);

  78.     else PRINT_IF_GUID(g, ff_asf_head2_guid);

  79.     else PRINT_IF_GUID(g, ff_asf_my_guid);

  80.     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);

  81.     else PRINT_IF_GUID(g, ff_asf_extended_content_header);

  82.     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);

  83.     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);

  84.     else PRINT_IF_GUID(g, ff_asf_metadata_header);

  85.     else PRINT_IF_GUID(g, ff_asf_marker_header);

  86.     else PRINT_IF_GUID(g, stream_bitrate_guid);

  87.     else PRINT_IF_GUID(g, ff_asf_language_guid);

  88.     else

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

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

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

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

  93. }

  94. #undef PRINT_IF_GUID

  95. #else

  96. #define print_guid(g)

  97. #endif

  98. 

  99. static void get_guid(ByteIOContext *s, ff_asf_guid *g)

  100. {

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

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

  103. }

  104. 

  105. #if 0

  106. static void get_str16(ByteIOContext *pb, char *buf, int buf_size)

  107. {

  108.     int len, c;

  109.     char *q;

  110. 

  111.     len = get_le16(pb);

  112.     q = buf;

  113.     while (len > 0) {

  114.         c = get_le16(pb);

  115.         if ((q - buf) < buf_size - 1)

  116.             *q++ = c;

  117.         len--;

  118.     }

  119.     *q = '\0';

  120. }

  121. #endif

  122. 

  123. static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)

  124. {

  125.     char* q = buf;

  126.     while (len > 1) {

  127.         uint8_t tmp;

  128.         uint32_t ch;

  129. 

  130.         GET_UTF16(ch, (len -= 2) >= 0 ? get_le16(pb) : 0, break;)

  131.         PUT_UTF8(ch, tmp, if (q - buf < buf_size - 1) *q++ = tmp;)

  132.     }

  133.     if (len > 0)

  134.         url_fskip(pb, len);

  135.     *q = '\0';

  136. }

  137. 

  138. static int asf_probe(AVProbeData *pd)

  139. {

  140.     /* check file header */

  141.     if (!guidcmp(pd->buf, &ff_asf_header))

  142.         return AVPROBE_SCORE_MAX;

  143.     else

  144.         return 0;

  145. }

  146. 

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

  148.     switch(type){

  149.         case 2: return get_le32(pb);

  150.         case 3: return get_le32(pb);

  151.         case 4: return get_le64(pb);

  152.         case 5: return get_le16(pb);

  153.         default:return INT_MIN;

  154.     }

  155. }

  156. 

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

  158. {

  159.     char *value;

  160. 

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

  162.         return;

  163. 

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

  165.     if (!value)

  166.         return;

  167. 

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

  169.         get_str16_nolen(s->pb, len, value, 2*len + 1);

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

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

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

  173.     } else {

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

  175.         av_freep(&value);

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

  177.         return;

  178.     }

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

  180.     av_freep(&value);

  181. }

  182. 

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

  184. {

  185.     ASFContext *asf = s->priv_data;

  186.     ff_asf_guid g;

  187.     ByteIOContext *pb = s->pb;

  188.     AVStream *st;

  189.     ASFStream *asf_st;

  190.     int size, i;

  191.     int64_t gsize;

  192.     AVRational dar[128];

  193.     uint32_t bitrate[128];

  194. 

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

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

  197. 

  198.     get_guid(pb, &g);

  199.     if (guidcmp(&g, &ff_asf_header))

  200.         return -1;

  201.     get_le64(pb);

  202.     get_le32(pb);

  203.     get_byte(pb);

  204.     get_byte(pb);

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

  206.     for(;;) {

  207.         uint64_t gpos= url_ftell(pb);

  208.         get_guid(pb, &g);

  209.         gsize = get_le64(pb);

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

  211.         print_guid(&g);

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

  213.         if (!guidcmp(&g, &ff_asf_data_header)) {

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

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

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

  217.                 asf->data_object_size = gsize - 24;

  218.             } else {

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

  220.             }

  221.             break;

  222.         }

  223.         if (gsize < 24)

  224.             return -1;

  225.         if (!guidcmp(&g, &ff_asf_file_header)) {

  226.             get_guid(pb, &asf->hdr.guid);

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

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

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

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

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

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

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

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

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

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

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

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

  239.         } else if (!guidcmp(&g, &ff_asf_stream_header)) {

  240.             enum AVMediaType type;

  241.             int type_specific_size, sizeX;

  242.             uint64_t total_size;

  243.             unsigned int tag1;

  244.             int64_t pos1, pos2, start_time;

  245.             int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  246. 

  247.             pos1 = url_ftell(pb);

  248. 

  249.             st = av_new_stream(s, 0);

  250.             if (!st)

  251.                 return AVERROR(ENOMEM);

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

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

  254.             if (!asf_st)

  255.                 return AVERROR(ENOMEM);

  256.             st->priv_data = asf_st;

  257.             start_time = asf->hdr.preroll;

  258. 

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

  260. 

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

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

  263.                     (10000000 / 1000) - start_time;

  264.             }

  265.             get_guid(pb, &g);

  266. 

  267.             test_for_ext_stream_audio = 0;

  268.             if (!guidcmp(&g, &ff_asf_audio_stream)) {

  269.                 type = AVMEDIA_TYPE_AUDIO;

  270.             } else if (!guidcmp(&g, &ff_asf_video_stream)) {

  271.                 type = AVMEDIA_TYPE_VIDEO;

  272.             } else if (!guidcmp(&g, &ff_asf_command_stream)) {

  273.                 type = AVMEDIA_TYPE_DATA;

  274.             } else if (!guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {

  275.                 test_for_ext_stream_audio = 1;

  276.                 type = AVMEDIA_TYPE_UNKNOWN;

  277.             } else {

  278.                 return -1;

  279.             }

  280.             get_guid(pb, &g);

  281.             total_size = get_le64(pb);

  282.             type_specific_size = get_le32(pb);

  283.             get_le32(pb);

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

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

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

  287. 

  288.             get_le32(pb);

  289. 

  290.             if (test_for_ext_stream_audio) {

  291.                 get_guid(pb, &g);

  292.                 if (!guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {

  293.                     type = AVMEDIA_TYPE_AUDIO;

  294.                     is_dvr_ms_audio=1;

  295.                     get_guid(pb, &g);

  296.                     get_le32(pb);

  297.                     get_le32(pb);

  298.                     get_le32(pb);

  299.                     get_guid(pb, &g);

  300.                     get_le32(pb);

  301.                 }

  302.             }

  303. 

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

  305.             if (type == AVMEDIA_TYPE_AUDIO) {

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

  307.                 if (is_dvr_ms_audio) {

  308.                     // codec_id and codec_tag are unreliable in dvr_ms

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

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

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

  312.                 }

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

  314.                     st->need_parsing = AVSTREAM_PARSE_NONE;

  315.                 } else {

  316.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  317.                 }

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

  319.                 pos2 = url_ftell(pb);

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

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

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

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

  324.                     get_le16(pb); //ds_data_size

  325.                     get_byte(pb); //ds_silence_data

  326.                 }

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

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

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

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

  331.                     if (!asf_st->ds_chunk_size

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

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

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

  335.                 }

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

  337.                 case CODEC_ID_MP3:

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

  339.                     break;

  340.                 case CODEC_ID_PCM_S16LE:

  341.                 case CODEC_ID_PCM_S16BE:

  342.                 case CODEC_ID_PCM_U16LE:

  343.                 case CODEC_ID_PCM_U16BE:

  344.                 case CODEC_ID_PCM_S8:

  345.                 case CODEC_ID_PCM_U8:

  346.                 case CODEC_ID_PCM_ALAW:

  347.                 case CODEC_ID_PCM_MULAW:

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

  349.                     break;

  350.                 default:

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

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

  353.                     break;

  354.                 }

  355.             } else if (type == AVMEDIA_TYPE_VIDEO) {

  356.                 get_le32(pb);

  357.                 get_le32(pb);

  358.                 get_byte(pb);

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

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

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

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

  363.                 /* not available for asf */

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

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

  366.                 tag1 = get_le32(pb);

  367.                 url_fskip(pb, 20);

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

  369.                 size= sizeX;

  370.                 if (size > 40) {

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

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

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

  374.                 }

  375. 

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

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

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

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

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

  381. #if HAVE_BIGENDIAN

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

  383.                         st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);

  384. #else

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

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

  387. #endif

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

  389.                 }

  390. 

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

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

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

  394.                     st->need_parsing = AVSTREAM_PARSE_FULL;

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

  396.                     st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;

  397.             }

  398.             pos2 = url_ftell(pb);

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

  400.         } else if (!guidcmp(&g, &ff_asf_comment_header)) {

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

  402. 

  403.             len1 = get_le16(pb);

  404.             len2 = get_le16(pb);

  405.             len3 = get_le16(pb);

  406.             len4 = get_le16(pb);

  407.             len5 = get_le16(pb);

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

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

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

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

  412.             url_fskip(pb, len5);

  413.         } else if (!guidcmp(&g, &stream_bitrate_guid)) {

  414.             int stream_count = get_le16(pb);

  415.             int j;

  416. 

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

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

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

  420.                 int flags, bitrate, stream_id;

  421. 

  422.                 flags= get_le16(pb);

  423.                 bitrate= get_le32(pb);

  424.                 stream_id= (flags & 0x7f);

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

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

  427.             }

  428.         } else if (!guidcmp(&g, &ff_asf_language_guid)) {

  429.             int j;

  430.             int stream_count = get_le16(pb);

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

  432.                 char lang[6];

  433.                 unsigned int lang_len = get_byte(pb);

  434.                 get_str16_nolen(pb, lang_len, lang, sizeof(lang));

  435.                 if (j < 128)

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

  437.             }

  438.         } else if (!guidcmp(&g, &ff_asf_extended_content_header)) {

  439.             int desc_count, i;

  440. 

  441.             desc_count = get_le16(pb);

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

  443.                     int name_len,value_type,value_len;

  444.                     char name[1024];

  445. 

  446.                     name_len = get_le16(pb);

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

  448.                         name_len += 1;

  449.                     get_str16_nolen(pb, name_len, name, sizeof(name));

  450.                     value_type = get_le16(pb);

  451.                     value_len  = get_le16(pb);

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

  453.                         value_len += 1;

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

  455.             }

  456.         } else if (!guidcmp(&g, &ff_asf_metadata_header)) {

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

  458.             n = get_le16(pb);

  459. 

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

  461.                 char name[1024];

  462. 

  463.                 get_le16(pb); //lang_list_index

  464.                 stream_num= get_le16(pb);

  465.                 name_len=   get_le16(pb);

  466.                 value_type= get_le16(pb);

  467.                 value_len=  get_le32(pb);

  468. 

  469.                 get_str16_nolen(pb, name_len, name, sizeof(name));

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

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

  472.                 url_fskip(pb, value_len - 2);

  473. 

  474.                 if(stream_num<128){

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

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

  477.                 }

  478.             }

  479.         } else if (!guidcmp(&g, &ff_asf_ext_stream_header)) {

  480.             int ext_len, payload_ext_ct, stream_ct;

  481.             uint32_t ext_d, leak_rate, stream_num;

  482.             unsigned int stream_languageid_index;

  483. 

  484.             get_le64(pb); // starttime

  485.             get_le64(pb); // endtime

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

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

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

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

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

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

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

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

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

  495. 

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

  497.             if (stream_num < 128)

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

  499. 

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

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

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

  503. 

  504.             if (stream_num < 128)

  505.                 bitrate[stream_num] = leak_rate;

  506. 

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

  508.                 get_le16(pb);

  509.                 ext_len = get_le16(pb);

  510.                 url_fseek(pb, ext_len, SEEK_CUR);

  511.             }

  512. 

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

  514.                 get_guid(pb, &g);

  515.                 ext_d=get_le16(pb);

  516.                 ext_len=get_le32(pb);

  517.                 url_fseek(pb, ext_len, SEEK_CUR);

  518.             }

  519. 

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

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

  522.         } else if (!guidcmp(&g, &ff_asf_head1_guid)) {

  523.             int v1, v2;

  524.             get_guid(pb, &g);

  525.             v1 = get_le32(pb);

  526.             v2 = get_le16(pb);

  527.         } else if (!guidcmp(&g, &ff_asf_marker_header)) {

  528.             int i, count, name_len;

  529.             char name[1024];

  530. 

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

  532.             get_le64(pb);            // ...

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

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

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

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

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

  538.             }

  539. 

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

  541.                 int64_t pres_time;

  542.                 int name_len;

  543. 

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

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

  546.                 get_le16(pb);             // entry length

  547.                 get_le32(pb);             // send time

  548.                 get_le32(pb);             // flags

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

  550.                 get_str16_nolen(pb, name_len * 2, name, sizeof(name));

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

  552.             }

  553. #if 0

  554.         } else if (!guidcmp(&g, &ff_asf_codec_comment_header)) {

  555.             int len, v1, n, num;

  556.             char str[256], *q;

  557.             char tag[16];

  558. 

  559.             get_guid(pb, &g);

  560.             print_guid(&g);

  561. 

  562.             n = get_le32(pb);

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

  564.                 num = get_le16(pb); /* stream number */

  565.                 get_str16(pb, str, sizeof(str));

  566.                 get_str16(pb, str, sizeof(str));

  567.                 len = get_le16(pb);

  568.                 q = tag;

  569.                 while (len > 0) {

  570.                     v1 = get_byte(pb);

  571.                     if ((q - tag) < sizeof(tag) - 1)

  572.                         *q++ = v1;

  573.                     len--;

  574.                 }

  575.                 *q = '\0';

  576.             }

  577. #endif

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

  579.             return -1;

  580.         } else {

  581.             if (!s->keylen) {

  582.                 if (!guidcmp(&g, &ff_asf_content_encryption)) {

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

  584.                 } else if (!guidcmp(&g, &ff_asf_ext_content_encryption)) {

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

  586.                 } else if (!guidcmp(&g, &ff_asf_digital_signature)) {

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

  588.                 }

  589.             }

  590.         }

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

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

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

  594.     }

  595.     get_guid(pb, &g);

  596.     get_le64(pb);

  597.     get_byte(pb);

  598.     get_byte(pb);

  599.     if (url_feof(pb))

  600.         return -1;

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

  602.     asf->packet_size_left = 0;

  603. 

  604. 

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

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

  607.         if(stream_num>=0){

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

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

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

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

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

  613.                           &st->sample_aspect_ratio.den,

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

  615. //av_log(s, AV_LOG_ERROR, "dar %d:%d sar=%d:%d\n", dar[i].num, dar[i].den, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);

  616. 

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

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

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

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

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

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

  623.                     if (iso6392)

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

  625.                 }

  626.             }

  627.         }

  628.     }

  629. 

  630.     return 0;

  631. }

  632. 

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

  634.     switch (bits & 3) \

  635.     { \

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

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

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

  639.     default: var = defval; break; \

  640.     }

  641. 

  642. /**

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

  644.  * @param s demux context

  645.  * @param pb context to read data from

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

  647.  */

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

  649. {

  650.     ASFContext *asf = s->priv_data;

  651.     uint32_t packet_length, padsize;

  652.     int rsize = 8;

  653.     int c, d, e, off;

  654. 

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

  656.     off= 32768;

  657.     if (s->packet_size > 0)

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

  659. 

  660.     c=d=e=-1;

  661.     while(off-- > 0){

  662.         c=d; d=e;

  663.         e= get_byte(pb);

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

  665.             break;

  666.     }

  667. 

  668.     if (c != 0x82) {

  669.         /**

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

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

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

  673.          * the stream.

  674.          */

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

  676.             return AVERROR(EAGAIN);

  677.         if (!url_feof(pb))

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

  679.     }

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

  681.         if (d || e) {

  682.             if (!url_feof(pb))

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

  684.             return -1;

  685.         }

  686.         c= get_byte(pb);

  687.         d= get_byte(pb);

  688.         rsize+=3;

  689.     }else{

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

  691.     }

  692. 

  693.     asf->packet_flags    = c;

  694.     asf->packet_property = d;

  695. 

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

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

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

  699. 

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

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

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

  703.         return -1;

  704.     }

  705.     if(padsize >= packet_length){

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

  707.         return -1;

  708.     }

  709. 

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

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

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

  713. 

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

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

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

  717.     } else {

  718.         asf->packet_segments = 1;

  719.         asf->packet_segsizetype = 0x80;

  720.     }

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

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

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

  724.     asf->packet_padsize = padsize;

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

  726.     return 0;

  727. }

  728. 

  729. /**

  730.  *

  731.  * @return <0 if error

  732.  */

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

  734.     ASFContext *asf = s->priv_data;

  735.     int rsize = 1;

  736.     int num = get_byte(pb);

  737.     int64_t ts0, ts1;

  738. 

  739.     asf->packet_segments--;

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

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

  742.     // sequence should be ignored!

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

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

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

  746. //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);

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

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

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

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

  751.             return -1;

  752.         }

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

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

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

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

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

  758.             url_fskip(pb, 10);

  759.             ts0= get_le64(pb);

  760.             ts1= get_le64(pb);

  761.             url_fskip(pb, 12);

  762.             get_le32(pb);

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

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

  765.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  766.         }else

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

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

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

  770.         // multipacket - frag_offset is beginning timestamp

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

  772.         asf->packet_frag_offset = 0;

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

  774. 

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

  776.         rsize++;

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

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

  779.         return -1;

  780.     }

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

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

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

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

  785.             return -1;

  786.         }

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

  788.     } else {

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

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

  791.     }

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

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

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

  795.             return -1;

  796.     }

  797.     asf->packet_size_left -= rsize;

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

  799. 

  800.     return 0;

  801. }

  802. 

  803. /**

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

  805.  * with asf_get_packet()).

  806.  * @param s demux context

  807.  * @param pb context to read data from

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

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

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

  811.  */

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

  813. {

  814.     ASFContext *asf = s->priv_data;

  815.     ASFStream *asf_st = 0;

  816.     for (;;) {

  817.         if(url_feof(pb))

  818.             return AVERROR_EOF;

  819.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  824.             assert(ret>=0);

  825.             /* fail safe */

  826.             url_fskip(pb, ret);

  827. 

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

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

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

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

  832.             return 1;

  833.         }

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

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

  836.                 asf->packet_segments= 0;

  837.                 continue;

  838.             }

  839.             if (asf->stream_index < 0

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

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

  842.                 ) {

  843.                 asf->packet_time_start = 0;

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

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

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

  847.                 if(asf->stream_index < 0)

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

  849.                 continue;

  850.             }

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

  852.         }

  853.         asf_st = asf->asf_st;

  854. 

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

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

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

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

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

  860.             asf->packet_size_left--;

  861.             asf->packet_multi_size--;

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

  863.             {

  864.                 asf->packet_time_start = 0;

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

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

  867.                 continue;

  868.             }

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

  870.             //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);

  871.         }

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

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

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

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

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

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

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

  879.         }

  880. 

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

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

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

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

  885.                 asf_st->frag_offset = 0;

  886.                 av_free_packet(&asf_st->pkt);

  887.             }

  888.             /* new packet */

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

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

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

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

  893.             asf_st->pkt.pos =

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

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

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

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

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

  899.                 asf->packet_key_frame = 1;

  900.             if (asf->packet_key_frame)

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

  902.         }

  903. 

  904.         /* read data */

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

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

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

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

  909.         if (asf->packet_size_left < 0)

  910.             continue;

  911. 

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

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

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

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

  916.             continue;

  917.         }

  918. 

  919.         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,

  920.                    asf->packet_frag_size);

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

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

  923.                             asf->packet_frag_size);

  924.         asf_st->frag_offset += asf->packet_frag_size;

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

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

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

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

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

  930.                 int i;

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

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

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

  934.                     asf_st->frag_offset = 0;

  935.                     av_free_packet(&asf_st->pkt);

  936.                     continue;

  937.                 }

  938.             }

  939. 

  940.             /* return packet */

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

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

  943.                     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);

  944.               }else{

  945.                 /* packet descrambling */

  946.                 uint8_t *newdata = av_malloc(asf_st->pkt.size);

  947.                 if (newdata) {

  948.                     int offset = 0;

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

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

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

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

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

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

  955. 

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

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

  958.                         memcpy(newdata + offset,

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

  960.                                asf_st->ds_chunk_size);

  961.                         offset += asf_st->ds_chunk_size;

  962.                     }

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

  964.                     asf_st->pkt.data = newdata;

  965.                 }

  966.               }

  967.             }

  968.             asf_st->frag_offset = 0;

  969.             *pkt= asf_st->pkt;

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

  971.             asf_st->pkt.size = 0;

  972.             asf_st->pkt.data = 0;

  973.             break; // packet completed

  974.         }

  975.     }

  976.     return 0;

  977. }

  978. 

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

  980. {

  981.     ASFContext *asf = s->priv_data;

  982. 

  983.     for (;;) {

  984.         int ret;

  985. 

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

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

  988.             return ret;

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

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

  991.         asf->packet_time_start = 0;

  992.     }

  993. 

  994.     return 0;

  995. }

  996. 

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

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

  999. // leftover information from previous reads

  1000. static void asf_reset_header(AVFormatContext *s)

  1001. {

  1002.     ASFContext *asf = s->priv_data;

  1003.     ASFStream *asf_st;

  1004.     int i;

  1005. 

  1006.     asf->packet_nb_frames = 0;

  1007.     asf->packet_size_left = 0;

  1008.     asf->packet_segments = 0;

  1009.     asf->packet_flags = 0;

  1010.     asf->packet_property = 0;

  1011.     asf->packet_timestamp = 0;

  1012.     asf->packet_segsizetype = 0;

  1013.     asf->packet_segments = 0;

  1014.     asf->packet_seq = 0;

  1015.     asf->packet_replic_size = 0;

  1016.     asf->packet_key_frame = 0;

  1017.     asf->packet_padsize = 0;

  1018.     asf->packet_frag_offset = 0;

  1019.     asf->packet_frag_size = 0;

  1020.     asf->packet_frag_timestamp = 0;

  1021.     asf->packet_multi_size = 0;

  1022.     asf->packet_obj_size = 0;

  1023.     asf->packet_time_delta = 0;

  1024.     asf->packet_time_start = 0;

  1025. 

  1026.     for(i=0; i<s->nb_streams; i++){

  1027.         asf_st= s->streams[i]->priv_data;

  1028.         av_free_packet(&asf_st->pkt);

  1029.         asf_st->frag_offset=0;

  1030.         asf_st->seq=0;

  1031.     }

  1032.     asf->asf_st= NULL;

  1033. }

  1034. 

  1035. static int asf_read_close(AVFormatContext *s)

  1036. {

  1037.     int i;

  1038. 

  1039.     asf_reset_header(s);

  1040.     for(i=0;i<s->nb_streams;i++) {

  1041.         AVStream *st = s->streams[i];

  1042.         av_free(st->codec->palctrl);

  1043.     }

  1044.     return 0;

  1045. }

  1046. 

  1047. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  1048. {

  1049.     AVPacket pkt1, *pkt = &pkt1;

  1050.     ASFStream *asf_st;

  1051.     int64_t pts;

  1052.     int64_t pos= *ppos;

  1053.     int i;

  1054.     int64_t start_pos[s->nb_streams];

  1055. 

  1056.     for(i=0; i<s->nb_streams; i++){

  1057.         start_pos[i]= pos;

  1058.     }

  1059. 

  1060.     if (s->packet_size > 0)

  1061.         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;

  1062.     *ppos= pos;

  1063.     url_fseek(s->pb, pos, SEEK_SET);

  1064. 

  1065. //printf("asf_read_pts\n");

  1066.     asf_reset_header(s);

  1067.     for(;;){

  1068.         if (av_read_frame(s, pkt) < 0){

  1069.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1070.             return AV_NOPTS_VALUE;

  1071.         }

  1072. 

  1073.         pts= pkt->pts;

  1074. 

  1075.         av_free_packet(pkt);

  1076.         if(pkt->flags&AV_PKT_FLAG_KEY){

  1077.             i= pkt->stream_index;

  1078. 

  1079.             asf_st= s->streams[i]->priv_data;

  1080. 

  1081. //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);

  1082.             pos= asf_st->packet_pos;

  1083. 

  1084.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1085.             start_pos[i]= asf_st->packet_pos + 1;

  1086. 

  1087.             if(pkt->stream_index == stream_index)

  1088.                break;

  1089.         }

  1090.     }

  1091. 

  1092.     *ppos= pos;

  1093. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1094. 

  1095.     return pts;

  1096. }

  1097. 

  1098. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1099. {

  1100.     ff_asf_guid g;

  1101.     ASFContext *asf = s->priv_data;

  1102.     int64_t current_pos= url_ftell(s->pb);

  1103.     int i;

  1104. 

  1105.     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);

  1106.     get_guid(s->pb, &g);

  1107.     if (!guidcmp(&g, &index_guid)) {

  1108.         int64_t itime, last_pos=-1;

  1109.         int pct, ict;

  1110.         int64_t av_unused gsize= get_le64(s->pb);

  1111.         get_guid(s->pb, &g);

  1112.         itime=get_le64(s->pb);

  1113.         pct=get_le32(s->pb);

  1114.         ict=get_le32(s->pb);

  1115.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1116. 

  1117.         for (i=0;i<ict;i++){

  1118.             int pktnum=get_le32(s->pb);

  1119.             int pktct =get_le16(s->pb);

  1120.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1121.             int64_t index_pts= av_rescale(itime, i, 10000);

  1122. 

  1123.             if(pos != last_pos){

  1124.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);

  1125.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1126.             last_pos=pos;

  1127.             }

  1128.         }

  1129.         asf->index_read= 1;

  1130.     }

  1131.     url_fseek(s->pb, current_pos, SEEK_SET);

  1132. }

  1133. 

  1134. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1135. {

  1136.     ASFContext *asf = s->priv_data;

  1137.     AVStream *st = s->streams[stream_index];

  1138.     int64_t pos;

  1139.     int index;

  1140. 

  1141.     if (s->packet_size <= 0)

  1142.         return -1;

  1143. 

  1144.     /* Try using the protocol's read_seek if available */

  1145.     if(s->pb) {

  1146.         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);

  1147.         if(ret >= 0)

  1148.             asf_reset_header(s);

  1149.         if (ret != AVERROR(ENOSYS))

  1150.             return ret;

  1151.     }

  1152. 

  1153.     if (!asf->index_read)

  1154.         asf_build_simple_index(s, stream_index);

  1155. 

  1156.     if(!(asf->index_read && st->index_entries)){

  1157.         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)

  1158.             return -1;

  1159.     }else{

  1160.         index= av_index_search_timestamp(st, pts, flags);

  1161.         if(index<0)

  1162.             return -1;

  1163. 

  1164.         /* find the position */

  1165.         pos = st->index_entries[index].pos;

  1166. 

  1167.     // various attempts to find key frame have failed so far

  1168.     //    asf_reset_header(s);

  1169.     //    url_fseek(s->pb, pos, SEEK_SET);

  1170.     //    key_pos = pos;

  1171.     //     for(i=0;i<16;i++){

  1172.     //         pos = url_ftell(s->pb);

  1173.     //         if (av_read_frame(s, &pkt) < 0){

  1174.     //             av_log(s, AV_LOG_INFO, "seek failed\n");

  1175.     //             return -1;

  1176.     //         }

  1177.     //         asf_st = s->streams[stream_index]->priv_data;

  1178.     //         pos += st->parser->frame_offset;

  1179.     //

  1180.     //         if (pkt.size > b) {

  1181.     //             b = pkt.size;

  1182.     //             key_pos = pos;

  1183.     //         }

  1184.     //

  1185.     //         av_free_packet(&pkt);

  1186.     //     }

  1187. 

  1188.         /* do the seek */

  1189.         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1190.         url_fseek(s->pb, pos, SEEK_SET);

  1191.     }

  1192.     asf_reset_header(s);

  1193.     return 0;

  1194. }

  1195. 

  1196. AVInputFormat asf_demuxer = {

  1197.     "asf",

  1198.     NULL_IF_CONFIG_SMALL("ASF format"),

  1199.     sizeof(ASFContext),

  1200.     asf_probe,

  1201.     asf_read_header,

  1202.     asf_read_packet,

  1203.     asf_read_close,

  1204.     asf_read_seek,

  1205.     asf_read_pts,

  1206.     .metadata_conv = ff_asf_metadata_conv,

  1207. };