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FFmpeg/libavformat/asfdec.c

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  1. /*

  2.  * ASF compatible demuxer

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

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. //#define DEBUG

  23. 

  24. #include "libavutil/common.h"

  25. #include "libavutil/avstring.h"

  26. #include "libavcodec/mpegaudio.h"

  27. #include "avformat.h"

  28. #include "riff.h"

  29. #include "asf.h"

  30. #include "asfcrypt.h"

  31. #include "avlanguage.h"

  32. 

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

  34. 

  35. #undef NDEBUG

  36. #include <assert.h>

  37. 

  38. #define ASF_MAX_STREAMS 127

  39. #define FRAME_HEADER_SIZE 17

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

  41. 

  42. static const ff_asf_guid index_guid = {

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

  44. };

  45. 

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

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

  48. };

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

  50. /* decoding */

  51. 

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

  53. {

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

  55. }

  56. 

  57. #ifdef DEBUG

  58. #define PRINT_IF_GUID(g,cmp) \

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

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

  61. 

  62. static void print_guid(const ff_asf_guid *g)

  63. {

  64.     int i;

  65.     PRINT_IF_GUID(g, ff_asf_header);

  66.     else PRINT_IF_GUID(g, ff_asf_file_header);

  67.     else PRINT_IF_GUID(g, ff_asf_stream_header);

  68.     else PRINT_IF_GUID(g, ff_asf_audio_stream);

  69.     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);

  70.     else PRINT_IF_GUID(g, ff_asf_video_stream);

  71.     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);

  72.     else PRINT_IF_GUID(g, ff_asf_command_stream);

  73.     else PRINT_IF_GUID(g, ff_asf_comment_header);

  74.     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);

  75.     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);

  76.     else PRINT_IF_GUID(g, ff_asf_data_header);

  77.     else PRINT_IF_GUID(g, index_guid);

  78.     else PRINT_IF_GUID(g, ff_asf_head1_guid);

  79.     else PRINT_IF_GUID(g, ff_asf_head2_guid);

  80.     else PRINT_IF_GUID(g, ff_asf_my_guid);

  81.     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);

  82.     else PRINT_IF_GUID(g, ff_asf_extended_content_header);

  83.     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);

  84.     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);

  85.     else PRINT_IF_GUID(g, ff_asf_metadata_header);

  86.     else PRINT_IF_GUID(g, ff_asf_marker_header);

  87.     else PRINT_IF_GUID(g, stream_bitrate_guid);

  88.     else PRINT_IF_GUID(g, ff_asf_language_guid);

  89.     else

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

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

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

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

  94. }

  95. #undef PRINT_IF_GUID

  96. #else

  97. #define print_guid(g)

  98. #endif

  99. 

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

  101. {

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

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

  104. }

  105. 

  106. #if 0

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

  108. {

  109.     int len, c;

  110.     char *q;

  111. 

  112.     len = get_le16(pb);

  113.     q = buf;

  114.     while (len > 0) {

  115.         c = get_le16(pb);

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

  117.             *q++ = c;

  118.         len--;

  119.     }

  120.     *q = '\0';

  121. }

  122. #endif

  123. 

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

  125. {

  126.     char* q = buf;

  127.     while (len > 1) {

  128.         uint8_t tmp;

  129.         uint32_t ch;

  130. 

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

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

  133.     }

  134.     if (len > 0)

  135.         url_fskip(pb, len);

  136.     *q = '\0';

  137. }

  138. 

  139. static int asf_probe(AVProbeData *pd)

  140. {

  141.     /* check file header */

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

  143.         return AVPROBE_SCORE_MAX;

  144.     else

  145.         return 0;

  146. }

  147. 

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

  149.     switch(type){

  150.         case 2: return get_le32(pb);

  151.         case 3: return get_le32(pb);

  152.         case 4: return get_le64(pb);

  153.         case 5: return get_le16(pb);

  154.         default:return INT_MIN;

  155.     }

  156. }

  157. 

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

  159. {

  160.     char *value;

  161. 

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

  163.         return;

  164. 

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

  166.     if (!value)

  167.         return;

  168. 

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

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

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

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

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

  174.     } else {

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

  176.         av_freep(&value);

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

  178.         return;

  179.     }

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

  181.     av_freep(&value);

  182. }

  183. 

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

  185. {

  186.     ASFContext *asf = s->priv_data;

  187.     ff_asf_guid g;

  188.     ByteIOContext *pb = s->pb;

  189.     AVStream *st;

  190.     ASFStream *asf_st;

  191.     int size, i;

  192.     int64_t gsize;

  193.     AVRational dar[128];

  194.     uint32_t bitrate[128];

  195. 

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

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

  198. 

  199.     get_guid(pb, &g);

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

  201.         return -1;

  202.     get_le64(pb);

  203.     get_le32(pb);

  204.     get_byte(pb);

  205.     get_byte(pb);

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

  207.     for(;;) {

  208.         uint64_t gpos= url_ftell(pb);

  209.         get_guid(pb, &g);

  210.         gsize = get_le64(pb);

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

  212.         print_guid(&g);

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

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

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

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

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

  218.                 asf->data_object_size = gsize - 24;

  219.             } else {

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

  221.             }

  222.             break;

  223.         }

  224.         if (gsize < 24)

  225.             return -1;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  241.             enum AVMediaType type;

  242.             int type_specific_size, sizeX;

  243.             uint64_t total_size;

  244.             unsigned int tag1;

  245.             int64_t pos1, pos2, start_time;

  246.             int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  247. 

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

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

  250.                 return AVERROR(EINVAL);

  251.             }

  252. 

  253.             pos1 = url_ftell(pb);

  254. 

  255.             st = av_new_stream(s, 0);

  256.             if (!st)

  257.                 return AVERROR(ENOMEM);

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

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

  260.             if (!asf_st)

  261.                 return AVERROR(ENOMEM);

  262.             st->priv_data = asf_st;

  263.             start_time = asf->hdr.preroll;

  264. 

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

  266. 

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

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

  269.                     (10000000 / 1000) - start_time;

  270.             }

  271.             get_guid(pb, &g);

  272. 

  273.             test_for_ext_stream_audio = 0;

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

  275.                 type = AVMEDIA_TYPE_AUDIO;

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

  277.                 type = AVMEDIA_TYPE_VIDEO;

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

  279.                 type = AVMEDIA_TYPE_DATA;

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

  281.                 test_for_ext_stream_audio = 1;

  282.                 type = AVMEDIA_TYPE_UNKNOWN;

  283.             } else {

  284.                 return -1;

  285.             }

  286.             get_guid(pb, &g);

  287.             total_size = get_le64(pb);

  288.             type_specific_size = get_le32(pb);

  289.             get_le32(pb);

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

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

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

  293. 

  294.             get_le32(pb);

  295. 

  296.             if (test_for_ext_stream_audio) {

  297.                 get_guid(pb, &g);

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

  299.                     type = AVMEDIA_TYPE_AUDIO;

  300.                     is_dvr_ms_audio=1;

  301.                     get_guid(pb, &g);

  302.                     get_le32(pb);

  303.                     get_le32(pb);

  304.                     get_le32(pb);

  305.                     get_guid(pb, &g);

  306.                     get_le32(pb);

  307.                 }

  308.             }

  309. 

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

  311.             if (type == AVMEDIA_TYPE_AUDIO) {

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

  313.                 if (is_dvr_ms_audio) {

  314.                     // codec_id and codec_tag are unreliable in dvr_ms

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

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

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

  318.                 }

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

  320.                     st->need_parsing = AVSTREAM_PARSE_NONE;

  321.                 } else {

  322.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  323.                 }

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

  325.                 pos2 = url_ftell(pb);

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

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

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

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

  330.                     get_le16(pb); //ds_data_size

  331.                     get_byte(pb); //ds_silence_data

  332.                 }

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

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

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

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

  337.                     if (!asf_st->ds_chunk_size

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

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

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

  341.                 }

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

  343.                 case CODEC_ID_MP3:

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

  345.                     break;

  346.                 case CODEC_ID_PCM_S16LE:

  347.                 case CODEC_ID_PCM_S16BE:

  348.                 case CODEC_ID_PCM_U16LE:

  349.                 case CODEC_ID_PCM_U16BE:

  350.                 case CODEC_ID_PCM_S8:

  351.                 case CODEC_ID_PCM_U8:

  352.                 case CODEC_ID_PCM_ALAW:

  353.                 case CODEC_ID_PCM_MULAW:

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

  355.                     break;

  356.                 default:

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

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

  359.                     break;

  360.                 }

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

  362.                 get_le32(pb);

  363.                 get_le32(pb);

  364.                 get_byte(pb);

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

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

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

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

  369.                 /* not available for asf */

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

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

  372.                 tag1 = get_le32(pb);

  373.                 url_fskip(pb, 20);

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

  375.                 size= sizeX;

  376.                 if (size > 40) {

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

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

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

  380.                 }

  381. 

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

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

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

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

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

  387. #if HAVE_BIGENDIAN

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

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

  390. #else

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

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

  393. #endif

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

  395.                 }

  396. 

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

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

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

  400.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  401.                     // issue658 containse wrong w/h and MS even puts a fake seq header with wrong w/h in extradata while a correct one is in te stream. maximum lameness

  402.                     st->codec->width  =

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

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

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

  406.                 }

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

  408.                     st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;

  409.             }

  410.             pos2 = url_ftell(pb);

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

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

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

  414. 

  415.             len1 = get_le16(pb);

  416.             len2 = get_le16(pb);

  417.             len3 = get_le16(pb);

  418.             len4 = get_le16(pb);

  419.             len5 = get_le16(pb);

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

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

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

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

  424.             url_fskip(pb, len5);

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

  426.             int stream_count = get_le16(pb);

  427.             int j;

  428. 

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

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

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

  432.                 int flags, bitrate, stream_id;

  433. 

  434.                 flags= get_le16(pb);

  435.                 bitrate= get_le32(pb);

  436.                 stream_id= (flags & 0x7f);

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

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

  439.             }

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

  441.             int j;

  442.             int stream_count = get_le16(pb);

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

  444.                 char lang[6];

  445.                 unsigned int lang_len = get_byte(pb);

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

  447.                 if (j < 128)

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

  449.             }

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

  451.             int desc_count, i;

  452. 

  453.             desc_count = get_le16(pb);

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

  455.                     int name_len,value_type,value_len;

  456.                     char name[1024];

  457. 

  458.                     name_len = get_le16(pb);

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

  460.                         name_len += 1;

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

  462.                     value_type = get_le16(pb);

  463.                     value_len  = get_le16(pb);

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

  465.                         value_len += 1;

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

  467.             }

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

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

  470.             n = get_le16(pb);

  471. 

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

  473.                 char name[1024];

  474. 

  475.                 get_le16(pb); //lang_list_index

  476.                 stream_num= get_le16(pb);

  477.                 name_len=   get_le16(pb);

  478.                 value_type= get_le16(pb);

  479.                 value_len=  get_le32(pb);

  480. 

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

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

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

  484.                 url_fskip(pb, value_len - 2);

  485. 

  486.                 if(stream_num<128){

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

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

  489.                 }

  490.             }

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

  492.             int ext_len, payload_ext_ct, stream_ct;

  493.             uint32_t ext_d, leak_rate, stream_num;

  494.             unsigned int stream_languageid_index;

  495. 

  496.             get_le64(pb); // starttime

  497.             get_le64(pb); // endtime

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

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

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

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

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

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

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

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

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

  507. 

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

  509.             if (stream_num < 128)

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

  511. 

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

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

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

  515. 

  516.             if (stream_num < 128)

  517.                 bitrate[stream_num] = leak_rate;

  518. 

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

  520.                 get_le16(pb);

  521.                 ext_len = get_le16(pb);

  522.                 url_fseek(pb, ext_len, SEEK_CUR);

  523.             }

  524. 

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

  526.                 get_guid(pb, &g);

  527.                 ext_d=get_le16(pb);

  528.                 ext_len=get_le32(pb);

  529.                 url_fseek(pb, ext_len, SEEK_CUR);

  530.             }

  531. 

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

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

  534.             continue;

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

  536.             int v1, v2;

  537.             get_guid(pb, &g);

  538.             v1 = get_le32(pb);

  539.             v2 = get_le16(pb);

  540.             continue;

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

  542.             int i, count, name_len;

  543.             char name[1024];

  544. 

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

  546.             get_le64(pb);            // ...

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

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

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

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

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

  552.             }

  553. 

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

  555.                 int64_t pres_time;

  556.                 int name_len;

  557. 

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

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

  560.                 get_le16(pb);             // entry length

  561.                 get_le32(pb);             // send time

  562.                 get_le32(pb);             // flags

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

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

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

  566.             }

  567. #if 0

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

  569.             int len, v1, n, num;

  570.             char str[256], *q;

  571.             char tag[16];

  572. 

  573.             get_guid(pb, &g);

  574.             print_guid(&g);

  575. 

  576.             n = get_le32(pb);

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

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

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

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

  581.                 len = get_le16(pb);

  582.                 q = tag;

  583.                 while (len > 0) {

  584.                     v1 = get_byte(pb);

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

  586.                         *q++ = v1;

  587.                     len--;

  588.                 }

  589.                 *q = '\0';

  590.             }

  591. #endif

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

  593.             return -1;

  594.         } else {

  595.             if (!s->keylen) {

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

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

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

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

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

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

  602.                 }

  603.             }

  604.         }

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

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

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

  608.     }

  609.     get_guid(pb, &g);

  610.     get_le64(pb);

  611.     get_byte(pb);

  612.     get_byte(pb);

  613.     if (url_feof(pb))

  614.         return -1;

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

  616.     asf->packet_size_left = 0;

  617. 

  618. 

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

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

  621.         if(stream_num>=0){

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

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

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

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

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

  627.                           &st->sample_aspect_ratio.den,

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

  629. //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);

  630. 

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

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

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

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

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

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

  637.                     if (iso6392)

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

  639.                 }

  640.             }

  641.         }

  642.     }

  643. 

  644.     return 0;

  645. }

  646. 

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

  648.     switch (bits & 3) \

  649.     { \

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

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

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

  653.     default: var = defval; break; \

  654.     }

  655. 

  656. /**

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

  658.  * @param s demux context

  659.  * @param pb context to read data from

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

  661.  */

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

  663. {

  664.     ASFContext *asf = s->priv_data;

  665.     uint32_t packet_length, padsize;

  666.     int rsize = 8;

  667.     int c, d, e, off;

  668. 

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

  670.     off= 32768;

  671.     if (s->packet_size > 0)

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

  673. 

  674.     c=d=e=-1;

  675.     while(off-- > 0){

  676.         c=d; d=e;

  677.         e= get_byte(pb);

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

  679.             break;

  680.     }

  681. 

  682.     if (c != 0x82) {

  683.         /**

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

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

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

  687.          * the stream.

  688.          */

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

  690.             return AVERROR(EAGAIN);

  691.         if (!url_feof(pb))

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

  693.     }

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

  695.         if (d || e) {

  696.             if (!url_feof(pb))

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

  698.             return -1;

  699.         }

  700.         c= get_byte(pb);

  701.         d= get_byte(pb);

  702.         rsize+=3;

  703.     }else{

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

  705.     }

  706. 

  707.     asf->packet_flags    = c;

  708.     asf->packet_property = d;

  709. 

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

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

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

  713. 

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

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

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

  717.         return -1;

  718.     }

  719.     if(padsize >= packet_length){

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

  721.         return -1;

  722.     }

  723. 

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

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

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

  727. 

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

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

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

  731.     } else {

  732.         asf->packet_segments = 1;

  733.         asf->packet_segsizetype = 0x80;

  734.     }

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

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

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

  738.     asf->packet_padsize = padsize;

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

  740.     return 0;

  741. }

  742. 

  743. /**

  744.  *

  745.  * @return <0 if error

  746.  */

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

  748.     ASFContext *asf = s->priv_data;

  749.     int rsize = 1;

  750.     int num = get_byte(pb);

  751.     int64_t ts0, ts1;

  752. 

  753.     asf->packet_segments--;

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

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

  756.     // sequence should be ignored!

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

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

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

  760. //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);

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

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

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

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

  765.             return -1;

  766.         }

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

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

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

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

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

  772.             url_fskip(pb, 10);

  773.             ts0= get_le64(pb);

  774.             ts1= get_le64(pb);

  775.             url_fskip(pb, 12);

  776.             get_le32(pb);

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

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

  779.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  780.         }else

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

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

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

  784.         // multipacket - frag_offset is beginning timestamp

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

  786.         asf->packet_frag_offset = 0;

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

  788. 

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

  790.         rsize++;

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

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

  793.         return -1;

  794.     }

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

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

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

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

  799.             return -1;

  800.         }

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

  802.     } else {

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

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

  805.     }

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

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

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

  809.             return -1;

  810.     }

  811.     asf->packet_size_left -= rsize;

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

  813. 

  814.     return 0;

  815. }

  816. 

  817. /**

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

  819.  * with asf_get_packet()).

  820.  * @param s demux context

  821.  * @param pb context to read data from

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

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

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

  825.  */

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

  827. {

  828.     ASFContext *asf = s->priv_data;

  829.     ASFStream *asf_st = 0;

  830.     for (;;) {

  831.         if(url_feof(pb))

  832.             return AVERROR_EOF;

  833.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  838.             assert(ret>=0);

  839.             /* fail safe */

  840.             url_fskip(pb, ret);

  841. 

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

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

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

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

  846.             return 1;

  847.         }

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

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

  850.                 asf->packet_segments= 0;

  851.                 continue;

  852.             }

  853.             if (asf->stream_index < 0

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

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

  856.                 ) {

  857.                 asf->packet_time_start = 0;

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

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

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

  861.                 if(asf->stream_index < 0)

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

  863.                 continue;

  864.             }

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

  866.         }

  867.         asf_st = asf->asf_st;

  868. 

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

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

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

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

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

  874.             asf->packet_size_left--;

  875.             asf->packet_multi_size--;

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

  877.             {

  878.                 asf->packet_time_start = 0;

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

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

  881.                 continue;

  882.             }

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

  884.             //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);

  885.         }

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

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

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

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

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

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

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

  893.         }

  894. 

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

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

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

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

  899.                 asf_st->frag_offset = 0;

  900.                 av_free_packet(&asf_st->pkt);

  901.             }

  902.             /* new packet */

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

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

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

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

  907.             asf_st->pkt.pos =

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

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

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

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

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

  913.                 asf->packet_key_frame = 1;

  914.             if (asf->packet_key_frame)

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

  916.         }

  917. 

  918.         /* read data */

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

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

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

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

  923.         if (asf->packet_size_left < 0)

  924.             continue;

  925. 

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

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

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

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

  930.             continue;

  931.         }

  932. 

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

  934.                    asf->packet_frag_size);

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

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

  937.                             asf->packet_frag_size);

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

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

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

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

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

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

  944.                 int i;

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

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

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

  948.                     asf_st->frag_offset = 0;

  949.                     av_free_packet(&asf_st->pkt);

  950.                     continue;

  951.                 }

  952.             }

  953. 

  954.             /* return packet */

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

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

  957.                     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);

  958.               }else{

  959.                 /* packet descrambling */

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

  961.                 if (newdata) {

  962.                     int offset = 0;

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

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

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

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

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

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

  969. 

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

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

  972.                         memcpy(newdata + offset,

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

  974.                                asf_st->ds_chunk_size);

  975.                         offset += asf_st->ds_chunk_size;

  976.                     }

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

  978.                     asf_st->pkt.data = newdata;

  979.                 }

  980.               }

  981.             }

  982.             asf_st->frag_offset = 0;

  983.             *pkt= asf_st->pkt;

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

  985.             asf_st->pkt.size = 0;

  986.             asf_st->pkt.data = 0;

  987.             break; // packet completed

  988.         }

  989.     }

  990.     return 0;

  991. }

  992. 

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

  994. {

  995.     ASFContext *asf = s->priv_data;

  996. 

  997.     for (;;) {

  998.         int ret;

  999. 

  1000.         /* parse cached packets, if any */

  1001.         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)

  1002.             return ret;

  1003.         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)

  1004.             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);

  1005.         asf->packet_time_start = 0;

  1006.     }

  1007. 

  1008.     return 0;

  1009. }

  1010. 

  1011. // Added to support seeking after packets have been read

  1012. // If information is not reset, read_packet fails due to

  1013. // leftover information from previous reads

  1014. static void asf_reset_header(AVFormatContext *s)

  1015. {

  1016.     ASFContext *asf = s->priv_data;

  1017.     ASFStream *asf_st;

  1018.     int i;

  1019. 

  1020.     asf->packet_nb_frames = 0;

  1021.     asf->packet_size_left = 0;

  1022.     asf->packet_segments = 0;

  1023.     asf->packet_flags = 0;

  1024.     asf->packet_property = 0;

  1025.     asf->packet_timestamp = 0;

  1026.     asf->packet_segsizetype = 0;

  1027.     asf->packet_segments = 0;

  1028.     asf->packet_seq = 0;

  1029.     asf->packet_replic_size = 0;

  1030.     asf->packet_key_frame = 0;

  1031.     asf->packet_padsize = 0;

  1032.     asf->packet_frag_offset = 0;

  1033.     asf->packet_frag_size = 0;

  1034.     asf->packet_frag_timestamp = 0;

  1035.     asf->packet_multi_size = 0;

  1036.     asf->packet_obj_size = 0;

  1037.     asf->packet_time_delta = 0;

  1038.     asf->packet_time_start = 0;

  1039. 

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

  1041.         asf_st= s->streams[i]->priv_data;

  1042.         av_free_packet(&asf_st->pkt);

  1043.         asf_st->frag_offset=0;

  1044.         asf_st->seq=0;

  1045.     }

  1046.     asf->asf_st= NULL;

  1047. }

  1048. 

  1049. static int asf_read_close(AVFormatContext *s)

  1050. {

  1051.     int i;

  1052. 

  1053.     asf_reset_header(s);

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

  1055.         AVStream *st = s->streams[i];

  1056.         av_free(st->codec->palctrl);

  1057.     }

  1058.     return 0;

  1059. }

  1060. 

  1061. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  1062. {

  1063.     AVPacket pkt1, *pkt = &pkt1;

  1064.     ASFStream *asf_st;

  1065.     int64_t pts;

  1066.     int64_t pos= *ppos;

  1067.     int i;

  1068.     int64_t start_pos[ASF_MAX_STREAMS];

  1069. 

  1070.     for(i=0; i<s->nb_streams; i++){

  1071.         start_pos[i]= pos;

  1072.     }

  1073. 

  1074.     if (s->packet_size > 0)

  1075.         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;

  1076.     *ppos= pos;

  1077.     url_fseek(s->pb, pos, SEEK_SET);

  1078. 

  1079. //printf("asf_read_pts\n");

  1080.     asf_reset_header(s);

  1081.     for(;;){

  1082.         if (av_read_frame(s, pkt) < 0){

  1083.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1084.             return AV_NOPTS_VALUE;

  1085.         }

  1086. 

  1087.         pts= pkt->pts;

  1088. 

  1089.         av_free_packet(pkt);

  1090.         if(pkt->flags&AV_PKT_FLAG_KEY){

  1091.             i= pkt->stream_index;

  1092. 

  1093.             asf_st= s->streams[i]->priv_data;

  1094. 

  1095. //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);

  1096.             pos= asf_st->packet_pos;

  1097. 

  1098.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1099.             start_pos[i]= asf_st->packet_pos + 1;

  1100. 

  1101.             if(pkt->stream_index == stream_index)

  1102.                break;

  1103.         }

  1104.     }

  1105. 

  1106.     *ppos= pos;

  1107. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1108. 

  1109.     return pts;

  1110. }

  1111. 

  1112. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1113. {

  1114.     ff_asf_guid g;

  1115.     ASFContext *asf = s->priv_data;

  1116.     int64_t current_pos= url_ftell(s->pb);

  1117.     int i;

  1118. 

  1119.     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);

  1120.     get_guid(s->pb, &g);

  1121.     if (!guidcmp(&g, &index_guid)) {

  1122.         int64_t itime, last_pos=-1;

  1123.         int pct, ict;

  1124.         int64_t av_unused gsize= get_le64(s->pb);

  1125.         get_guid(s->pb, &g);

  1126.         itime=get_le64(s->pb);

  1127.         pct=get_le32(s->pb);

  1128.         ict=get_le32(s->pb);

  1129.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1130. 

  1131.         for (i=0;i<ict;i++){

  1132.             int pktnum=get_le32(s->pb);

  1133.             int pktct =get_le16(s->pb);

  1134.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1135.             int64_t index_pts= av_rescale(itime, i, 10000);

  1136. 

  1137.             if(pos != last_pos){

  1138.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);

  1139.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1140.             last_pos=pos;

  1141.             }

  1142.         }

  1143.         asf->index_read= 1;

  1144.     }

  1145.     url_fseek(s->pb, current_pos, SEEK_SET);

  1146. }

  1147. 

  1148. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1149. {

  1150.     ASFContext *asf = s->priv_data;

  1151.     AVStream *st = s->streams[stream_index];

  1152.     int64_t pos;

  1153.     int index;

  1154. 

  1155.     if (s->packet_size <= 0)

  1156.         return -1;

  1157. 

  1158.     /* Try using the protocol's read_seek if available */

  1159.     if(s->pb) {

  1160.         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);

  1161.         if(ret >= 0)

  1162.             asf_reset_header(s);

  1163.         if (ret != AVERROR(ENOSYS))

  1164.             return ret;

  1165.     }

  1166. 

  1167.     if (!asf->index_read)

  1168.         asf_build_simple_index(s, stream_index);

  1169. 

  1170.     if(!(asf->index_read && st->index_entries)){

  1171.         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)

  1172.             return -1;

  1173.     }else{

  1174.         index= av_index_search_timestamp(st, pts, flags);

  1175.         if(index<0)

  1176.             return -1;

  1177. 

  1178.         /* find the position */

  1179.         pos = st->index_entries[index].pos;

  1180. 

  1181.     // various attempts to find key frame have failed so far

  1182.     //    asf_reset_header(s);

  1183.     //    url_fseek(s->pb, pos, SEEK_SET);

  1184.     //    key_pos = pos;

  1185.     //     for(i=0;i<16;i++){

  1186.     //         pos = url_ftell(s->pb);

  1187.     //         if (av_read_frame(s, &pkt) < 0){

  1188.     //             av_log(s, AV_LOG_INFO, "seek failed\n");

  1189.     //             return -1;

  1190.     //         }

  1191.     //         asf_st = s->streams[stream_index]->priv_data;

  1192.     //         pos += st->parser->frame_offset;

  1193.     //

  1194.     //         if (pkt.size > b) {

  1195.     //             b = pkt.size;

  1196.     //             key_pos = pos;

  1197.     //         }

  1198.     //

  1199.     //         av_free_packet(&pkt);

  1200.     //     }

  1201. 

  1202.         /* do the seek */

  1203.         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1204.         url_fseek(s->pb, pos, SEEK_SET);

  1205.     }

  1206.     asf_reset_header(s);

  1207.     return 0;

  1208. }

  1209. 

  1210. AVInputFormat asf_demuxer = {

  1211.     "asf",

  1212.     NULL_IF_CONFIG_SMALL("ASF format"),

  1213.     sizeof(ASFContext),

  1214.     asf_probe,

  1215.     asf_read_header,

  1216.     asf_read_packet,

  1217.     asf_read_close,

  1218.     asf_read_seek,

  1219.     asf_read_pts,

  1220.     .metadata_conv = ff_asf_metadata_conv,

  1221. };