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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.             }

  396.             pos2 = url_ftell(pb);

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

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

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

  400. 

  401.             len1 = get_le16(pb);

  402.             len2 = get_le16(pb);

  403.             len3 = get_le16(pb);

  404.             len4 = get_le16(pb);

  405.             len5 = get_le16(pb);

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

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

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

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

  410.             url_fskip(pb, len5);

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

  412.             int stream_count = get_le16(pb);

  413.             int j;

  414. 

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

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

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

  418.                 int flags, bitrate, stream_id;

  419. 

  420.                 flags= get_le16(pb);

  421.                 bitrate= get_le32(pb);

  422.                 stream_id= (flags & 0x7f);

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

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

  425.             }

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

  427.             int j;

  428.             int stream_count = get_le16(pb);

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

  430.                 char lang[6];

  431.                 unsigned int lang_len = get_byte(pb);

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

  433.                 if (j < 128)

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

  435.             }

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

  437.             int desc_count, i;

  438. 

  439.             desc_count = get_le16(pb);

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

  441.                     int name_len,value_type,value_len;

  442.                     char name[1024];

  443. 

  444.                     name_len = get_le16(pb);

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

  446.                         name_len += 1;

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

  448.                     value_type = get_le16(pb);

  449.                     value_len  = get_le16(pb);

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

  451.                         value_len += 1;

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

  453.             }

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

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

  456.             n = get_le16(pb);

  457. 

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

  459.                 char name[1024];

  460. 

  461.                 get_le16(pb); //lang_list_index

  462.                 stream_num= get_le16(pb);

  463.                 name_len=   get_le16(pb);

  464.                 value_type= get_le16(pb);

  465.                 value_len=  get_le32(pb);

  466. 

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

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

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

  470.                 url_fskip(pb, value_len - 2);

  471. 

  472.                 if(stream_num<128){

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

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

  475.                 }

  476.             }

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

  478.             int ext_len, payload_ext_ct, stream_ct;

  479.             uint32_t ext_d, leak_rate, stream_num;

  480.             unsigned int stream_languageid_index;

  481. 

  482.             get_le64(pb); // starttime

  483.             get_le64(pb); // endtime

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

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

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

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

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

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

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

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

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

  493. 

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

  495.             if (stream_num < 128)

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

  497. 

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

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

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

  501. 

  502.             if (stream_num < 128)

  503.                 bitrate[stream_num] = leak_rate;

  504. 

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

  506.                 get_le16(pb);

  507.                 ext_len = get_le16(pb);

  508.                 url_fseek(pb, ext_len, SEEK_CUR);

  509.             }

  510. 

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

  512.                 get_guid(pb, &g);

  513.                 ext_d=get_le16(pb);

  514.                 ext_len=get_le32(pb);

  515.                 url_fseek(pb, ext_len, SEEK_CUR);

  516.             }

  517. 

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

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

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

  521.             int v1, v2;

  522.             get_guid(pb, &g);

  523.             v1 = get_le32(pb);

  524.             v2 = get_le16(pb);

  525.         } else if (!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.                 get_str16_nolen(pb, name_len * 2, name, sizeof(name));

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

  550.             }

  551. #if 0

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

  553.             int len, v1, n, num;

  554.             char str[256], *q;

  555.             char tag[16];

  556. 

  557.             get_guid(pb, &g);

  558.             print_guid(&g);

  559. 

  560.             n = get_le32(pb);

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

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

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

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

  565.                 len = get_le16(pb);

  566.                 q = tag;

  567.                 while (len > 0) {

  568.                     v1 = get_byte(pb);

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

  570.                         *q++ = v1;

  571.                     len--;

  572.                 }

  573.                 *q = '\0';

  574.             }

  575. #endif

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

  577.             return -1;

  578.         } else {

  579.             if (!s->keylen) {

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

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

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

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

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

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

  586.                 }

  587.             }

  588.         }

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

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

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

  592.     }

  593.     get_guid(pb, &g);

  594.     get_le64(pb);

  595.     get_byte(pb);

  596.     get_byte(pb);

  597.     if (url_feof(pb))

  598.         return -1;

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

  600.     asf->packet_size_left = 0;

  601. 

  602. 

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

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

  605.         if(stream_num>=0){

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

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

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

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

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

  611.                           &st->sample_aspect_ratio.den,

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

  613. //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);

  614. 

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

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

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

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

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

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

  621.                     if (iso6392)

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

  623.                 }

  624.             }

  625.         }

  626.     }

  627. 

  628.     return 0;

  629. }

  630. 

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

  632.     switch (bits & 3) \

  633.     { \

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

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

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

  637.     default: var = defval; break; \

  638.     }

  639. 

  640. /**

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

  642.  * @param s demux context

  643.  * @param pb context to read data from

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

  645.  */

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

  647. {

  648.     ASFContext *asf = s->priv_data;

  649.     uint32_t packet_length, padsize;

  650.     int rsize = 8;

  651.     int c, d, e, off;

  652. 

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

  654.     off= 32768;

  655.     if (s->packet_size > 0)

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

  657. 

  658.     c=d=e=-1;

  659.     while(off-- > 0){

  660.         c=d; d=e;

  661.         e= get_byte(pb);

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

  663.             break;

  664.     }

  665. 

  666.     if (c != 0x82) {

  667.         /**

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

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

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

  671.          * the stream.

  672.          */

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

  674.             return AVERROR(EAGAIN);

  675.         if (!url_feof(pb))

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

  677.     }

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

  679.         if (d || e) {

  680.             if (!url_feof(pb))

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

  682.             return -1;

  683.         }

  684.         c= get_byte(pb);

  685.         d= get_byte(pb);

  686.         rsize+=3;

  687.     }else{

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

  689.     }

  690. 

  691.     asf->packet_flags    = c;

  692.     asf->packet_property = d;

  693. 

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

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

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

  697. 

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

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

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

  701.         return -1;

  702.     }

  703.     if(padsize >= packet_length){

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

  705.         return -1;

  706.     }

  707. 

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

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

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

  711. 

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

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

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

  715.     } else {

  716.         asf->packet_segments = 1;

  717.         asf->packet_segsizetype = 0x80;

  718.     }

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

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

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

  722.     asf->packet_padsize = padsize;

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

  724.     return 0;

  725. }

  726. 

  727. /**

  728.  *

  729.  * @return <0 if error

  730.  */

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

  732.     ASFContext *asf = s->priv_data;

  733.     int rsize = 1;

  734.     int num = get_byte(pb);

  735.     int64_t ts0, ts1;

  736. 

  737.     asf->packet_segments--;

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

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

  740.     // sequence should be ignored!

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

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

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

  744. //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);

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

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

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

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

  749.             return -1;

  750.         }

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

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

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

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

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

  756.             url_fskip(pb, 10);

  757.             ts0= get_le64(pb);

  758.             ts1= get_le64(pb);

  759.             url_fskip(pb, 12);

  760.             get_le32(pb);

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

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

  763.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  764.         }else

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

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

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

  768.         // multipacket - frag_offset is beginning timestamp

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

  770.         asf->packet_frag_offset = 0;

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

  772. 

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

  774.         rsize++;

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

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

  777.         return -1;

  778.     }

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

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

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

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

  783.             return -1;

  784.         }

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

  786.     } else {

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

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

  789.     }

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

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

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

  793.             return -1;

  794.     }

  795.     asf->packet_size_left -= rsize;

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

  797. 

  798.     return 0;

  799. }

  800. 

  801. /**

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

  803.  * with asf_get_packet()).

  804.  * @param s demux context

  805.  * @param pb context to read data from

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

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

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

  809.  */

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

  811. {

  812.     ASFContext *asf = s->priv_data;

  813.     ASFStream *asf_st = 0;

  814.     for (;;) {

  815.         if(url_feof(pb))

  816.             return AVERROR_EOF;

  817.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  822.             assert(ret>=0);

  823.             /* fail safe */

  824.             url_fskip(pb, ret);

  825. 

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

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

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

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

  830.             return 1;

  831.         }

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

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

  834.                 asf->packet_segments= 0;

  835.                 continue;

  836.             }

  837.             if (asf->stream_index < 0

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

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

  840.                 ) {

  841.                 asf->packet_time_start = 0;

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

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

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

  845.                 if(asf->stream_index < 0)

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

  847.                 continue;

  848.             }

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

  850.         }

  851.         asf_st = asf->asf_st;

  852. 

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

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

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

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

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

  858.             asf->packet_size_left--;

  859.             asf->packet_multi_size--;

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

  861.             {

  862.                 asf->packet_time_start = 0;

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

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

  865.                 continue;

  866.             }

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

  868.             //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);

  869.         }

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

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

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

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

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

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

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

  877.         }

  878. 

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

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

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

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

  883.                 asf_st->frag_offset = 0;

  884.                 av_free_packet(&asf_st->pkt);

  885.             }

  886.             /* new packet */

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

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

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

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

  891.             asf_st->pkt.pos =

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

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

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

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

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

  897.                 asf->packet_key_frame = 1;

  898.             if (asf->packet_key_frame)

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

  900.         }

  901. 

  902.         /* read data */

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

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

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

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

  907.         if (asf->packet_size_left < 0)

  908.             continue;

  909. 

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

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

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

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

  914.             continue;

  915.         }

  916. 

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

  918.                    asf->packet_frag_size);

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

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

  921.                             asf->packet_frag_size);

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

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

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

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

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

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

  928.                 int i;

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

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

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

  932.                     asf_st->frag_offset = 0;

  933.                     av_free_packet(&asf_st->pkt);

  934.                     continue;

  935.                 }

  936.             }

  937. 

  938.             /* return packet */

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

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

  941.                     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);

  942.               }else{

  943.                 /* packet descrambling */

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

  945.                 if (newdata) {

  946.                     int offset = 0;

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

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

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

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

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

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

  953. 

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

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

  956.                         memcpy(newdata + offset,

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

  958.                                asf_st->ds_chunk_size);

  959.                         offset += asf_st->ds_chunk_size;

  960.                     }

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

  962.                     asf_st->pkt.data = newdata;

  963.                 }

  964.               }

  965.             }

  966.             asf_st->frag_offset = 0;

  967.             *pkt= asf_st->pkt;

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

  969.             asf_st->pkt.size = 0;

  970.             asf_st->pkt.data = 0;

  971.             break; // packet completed

  972.         }

  973.     }

  974.     return 0;

  975. }

  976. 

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

  978. {

  979.     ASFContext *asf = s->priv_data;

  980. 

  981.     for (;;) {

  982.         int ret;

  983. 

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

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

  986.             return ret;

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

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

  989.         asf->packet_time_start = 0;

  990.     }

  991. 

  992.     return 0;

  993. }

  994. 

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

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

  997. // leftover information from previous reads

  998. static void asf_reset_header(AVFormatContext *s)

  999. {

  1000.     ASFContext *asf = s->priv_data;

  1001.     ASFStream *asf_st;

  1002.     int i;

  1003. 

  1004.     asf->packet_nb_frames = 0;

  1005.     asf->packet_size_left = 0;

  1006.     asf->packet_segments = 0;

  1007.     asf->packet_flags = 0;

  1008.     asf->packet_property = 0;

  1009.     asf->packet_timestamp = 0;

  1010.     asf->packet_segsizetype = 0;

  1011.     asf->packet_segments = 0;

  1012.     asf->packet_seq = 0;

  1013.     asf->packet_replic_size = 0;

  1014.     asf->packet_key_frame = 0;

  1015.     asf->packet_padsize = 0;

  1016.     asf->packet_frag_offset = 0;

  1017.     asf->packet_frag_size = 0;

  1018.     asf->packet_frag_timestamp = 0;

  1019.     asf->packet_multi_size = 0;

  1020.     asf->packet_obj_size = 0;

  1021.     asf->packet_time_delta = 0;

  1022.     asf->packet_time_start = 0;

  1023. 

  1024.     for(i=0; i<s->nb_streams; i++){

  1025.         asf_st= s->streams[i]->priv_data;

  1026.         av_free_packet(&asf_st->pkt);

  1027.         asf_st->frag_offset=0;

  1028.         asf_st->seq=0;

  1029.     }

  1030.     asf->asf_st= NULL;

  1031. }

  1032. 

  1033. static int asf_read_close(AVFormatContext *s)

  1034. {

  1035.     int i;

  1036. 

  1037.     asf_reset_header(s);

  1038.     for(i=0;i<s->nb_streams;i++) {

  1039.         AVStream *st = s->streams[i];

  1040.         av_free(st->codec->palctrl);

  1041.     }

  1042.     return 0;

  1043. }

  1044. 

  1045. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  1046. {

  1047.     AVPacket pkt1, *pkt = &pkt1;

  1048.     ASFStream *asf_st;

  1049.     int64_t pts;

  1050.     int64_t pos= *ppos;

  1051.     int i;

  1052.     int64_t start_pos[s->nb_streams];

  1053. 

  1054.     for(i=0; i<s->nb_streams; i++){

  1055.         start_pos[i]= pos;

  1056.     }

  1057. 

  1058.     if (s->packet_size > 0)

  1059.         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;

  1060.     *ppos= pos;

  1061.     url_fseek(s->pb, pos, SEEK_SET);

  1062. 

  1063. //printf("asf_read_pts\n");

  1064.     asf_reset_header(s);

  1065.     for(;;){

  1066.         if (av_read_frame(s, pkt) < 0){

  1067.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1068.             return AV_NOPTS_VALUE;

  1069.         }

  1070. 

  1071.         pts= pkt->pts;

  1072. 

  1073.         av_free_packet(pkt);

  1074.         if(pkt->flags&AV_PKT_FLAG_KEY){

  1075.             i= pkt->stream_index;

  1076. 

  1077.             asf_st= s->streams[i]->priv_data;

  1078. 

  1079. //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);

  1080.             pos= asf_st->packet_pos;

  1081. 

  1082.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1083.             start_pos[i]= asf_st->packet_pos + 1;

  1084. 

  1085.             if(pkt->stream_index == stream_index)

  1086.                break;

  1087.         }

  1088.     }

  1089. 

  1090.     *ppos= pos;

  1091. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1092. 

  1093.     return pts;

  1094. }

  1095. 

  1096. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1097. {

  1098.     ff_asf_guid g;

  1099.     ASFContext *asf = s->priv_data;

  1100.     int64_t current_pos= url_ftell(s->pb);

  1101.     int i;

  1102. 

  1103.     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);

  1104.     get_guid(s->pb, &g);

  1105.     if (!guidcmp(&g, &index_guid)) {

  1106.         int64_t itime, last_pos=-1;

  1107.         int pct, ict;

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

  1109.         get_guid(s->pb, &g);

  1110.         itime=get_le64(s->pb);

  1111.         pct=get_le32(s->pb);

  1112.         ict=get_le32(s->pb);

  1113.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1114. 

  1115.         for (i=0;i<ict;i++){

  1116.             int pktnum=get_le32(s->pb);

  1117.             int pktct =get_le16(s->pb);

  1118.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1119.             int64_t index_pts= av_rescale(itime, i, 10000);

  1120. 

  1121.             if(pos != last_pos){

  1122.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);

  1123.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1124.             last_pos=pos;

  1125.             }

  1126.         }

  1127.         asf->index_read= 1;

  1128.     }

  1129.     url_fseek(s->pb, current_pos, SEEK_SET);

  1130. }

  1131. 

  1132. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1133. {

  1134.     ASFContext *asf = s->priv_data;

  1135.     AVStream *st = s->streams[stream_index];

  1136.     int64_t pos;

  1137.     int index;

  1138. 

  1139.     if (s->packet_size <= 0)

  1140.         return -1;

  1141. 

  1142.     /* Try using the protocol's read_seek if available */

  1143.     if(s->pb) {

  1144.         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);

  1145.         if(ret >= 0)

  1146.             asf_reset_header(s);

  1147.         if (ret != AVERROR(ENOSYS))

  1148.             return ret;

  1149.     }

  1150. 

  1151.     if (!asf->index_read)

  1152.         asf_build_simple_index(s, stream_index);

  1153. 

  1154.     if(!(asf->index_read && st->index_entries)){

  1155.         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)

  1156.             return -1;

  1157.     }else{

  1158.         index= av_index_search_timestamp(st, pts, flags);

  1159.         if(index<0)

  1160.             return -1;

  1161. 

  1162.         /* find the position */

  1163.         pos = st->index_entries[index].pos;

  1164. 

  1165.     // various attempts to find key frame have failed so far

  1166.     //    asf_reset_header(s);

  1167.     //    url_fseek(s->pb, pos, SEEK_SET);

  1168.     //    key_pos = pos;

  1169.     //     for(i=0;i<16;i++){

  1170.     //         pos = url_ftell(s->pb);

  1171.     //         if (av_read_frame(s, &pkt) < 0){

  1172.     //             av_log(s, AV_LOG_INFO, "seek failed\n");

  1173.     //             return -1;

  1174.     //         }

  1175.     //         asf_st = s->streams[stream_index]->priv_data;

  1176.     //         pos += st->parser->frame_offset;

  1177.     //

  1178.     //         if (pkt.size > b) {

  1179.     //             b = pkt.size;

  1180.     //             key_pos = pos;

  1181.     //         }

  1182.     //

  1183.     //         av_free_packet(&pkt);

  1184.     //     }

  1185. 

  1186.         /* do the seek */

  1187.         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1188.         url_fseek(s->pb, pos, SEEK_SET);

  1189.     }

  1190.     asf_reset_header(s);

  1191.     return 0;

  1192. }

  1193. 

  1194. AVInputFormat asf_demuxer = {

  1195.     "asf",

  1196.     NULL_IF_CONFIG_SMALL("ASF format"),

  1197.     sizeof(ASFContext),

  1198.     asf_probe,

  1199.     asf_read_header,

  1200.     asf_read_packet,

  1201.     asf_read_close,

  1202.     asf_read_seek,

  1203.     asf_read_pts,

  1204.     .metadata_conv = ff_asf_metadata_conv,

  1205. };