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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, stream_bitrate_guid);

  86.     else PRINT_IF_GUID(g, ff_asf_language_guid);

  87.     else

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

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

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

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

  92. }

  93. #undef PRINT_IF_GUID

  94. #else

  95. #define print_guid(g)

  96. #endif

  97. 

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

  99. {

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

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

  102. }

  103. 

  104. #if 0

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

  106. {

  107.     int len, c;

  108.     char *q;

  109. 

  110.     len = get_le16(pb);

  111.     q = buf;

  112.     while (len > 0) {

  113.         c = get_le16(pb);

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

  115.             *q++ = c;

  116.         len--;

  117.     }

  118.     *q = '\0';

  119. }

  120. #endif

  121. 

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

  123. {

  124.     char* q = buf;

  125.     while (len > 1) {

  126.         uint8_t tmp;

  127.         uint32_t ch;

  128. 

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

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

  131.     }

  132.     if (len > 0)

  133.         url_fskip(pb, len);

  134.     *q = '\0';

  135. }

  136. 

  137. static int asf_probe(AVProbeData *pd)

  138. {

  139.     /* check file header */

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

  141.         return AVPROBE_SCORE_MAX;

  142.     else

  143.         return 0;

  144. }

  145. 

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

  147.     switch(type){

  148.         case 2: return get_le32(pb);

  149.         case 3: return get_le32(pb);

  150.         case 4: return get_le64(pb);

  151.         case 5: return get_le16(pb);

  152.         default:return INT_MIN;

  153.     }

  154. }

  155. 

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

  157. {

  158.     char *value;

  159. 

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

  161.         return;

  162. 

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

  164.     if (!value)

  165.         return;

  166. 

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

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

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

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

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

  172.     } else {

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

  174.         av_freep(&value);

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

  176.         return;

  177.     }

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

  179.     av_freep(&value);

  180. }

  181. 

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

  183. {

  184.     ASFContext *asf = s->priv_data;

  185.     ff_asf_guid g;

  186.     ByteIOContext *pb = s->pb;

  187.     AVStream *st;

  188.     ASFStream *asf_st;

  189.     int size, i;

  190.     int64_t gsize;

  191.     AVRational dar[128];

  192.     uint32_t bitrate[128];

  193. 

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

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

  196. 

  197.     get_guid(pb, &g);

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

  199.         return -1;

  200.     get_le64(pb);

  201.     get_le32(pb);

  202.     get_byte(pb);

  203.     get_byte(pb);

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

  205.     for(;;) {

  206.         get_guid(pb, &g);

  207.         gsize = get_le64(pb);

  208.         dprintf(s, "%08"PRIx64": ", url_ftell(pb) - 24);

  209.         print_guid(&g);

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

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

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

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

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

  215.                 asf->data_object_size = gsize - 24;

  216.             } else {

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

  218.             }

  219.             break;

  220.         }

  221.         if (gsize < 24)

  222.             return -1;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  238.             enum CodecType type;

  239.             int type_specific_size, sizeX;

  240.             uint64_t total_size;

  241.             unsigned int tag1;

  242.             int64_t pos1, pos2, start_time;

  243.             int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  244. 

  245.             pos1 = url_ftell(pb);

  246. 

  247.             st = av_new_stream(s, 0);

  248.             if (!st)

  249.                 return AVERROR(ENOMEM);

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

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

  252.             if (!asf_st)

  253.                 return AVERROR(ENOMEM);

  254.             st->priv_data = asf_st;

  255.             start_time = asf->hdr.preroll;

  256. 

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

  258. 

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

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

  261.                     (10000000 / 1000) - start_time;

  262.             }

  263.             get_guid(pb, &g);

  264. 

  265.             test_for_ext_stream_audio = 0;

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

  267.                 type = CODEC_TYPE_AUDIO;

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

  269.                 type = CODEC_TYPE_VIDEO;

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

  271.                 type = CODEC_TYPE_DATA;

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

  273.                 test_for_ext_stream_audio = 1;

  274.                 type = CODEC_TYPE_UNKNOWN;

  275.             } else {

  276.                 return -1;

  277.             }

  278.             get_guid(pb, &g);

  279.             total_size = get_le64(pb);

  280.             type_specific_size = get_le32(pb);

  281.             get_le32(pb);

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

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

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

  285. 

  286.             get_le32(pb);

  287. 

  288.             if (test_for_ext_stream_audio) {

  289.                 get_guid(pb, &g);

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

  291.                     type = CODEC_TYPE_AUDIO;

  292.                     is_dvr_ms_audio=1;

  293.                     get_guid(pb, &g);

  294.                     get_le32(pb);

  295.                     get_le32(pb);

  296.                     get_le32(pb);

  297.                     get_guid(pb, &g);

  298.                     get_le32(pb);

  299.                 }

  300.             }

  301. 

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

  303.             if (type == CODEC_TYPE_AUDIO) {

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

  305.                 if (is_dvr_ms_audio) {

  306.                     // codec_id and codec_tag are unreliable in dvr_ms

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

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

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

  310.                 }

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

  312.                     st->need_parsing = AVSTREAM_PARSE_NONE;

  313.                 } else {

  314.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  315.                 }

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

  317.                 pos2 = url_ftell(pb);

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

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

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

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

  322.                     get_le16(pb); //ds_data_size

  323.                     get_byte(pb); //ds_silence_data

  324.                 }

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

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

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

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

  329.                     if (!asf_st->ds_chunk_size

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

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

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

  333.                 }

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

  335.                 case CODEC_ID_MP3:

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

  337.                     break;

  338.                 case CODEC_ID_PCM_S16LE:

  339.                 case CODEC_ID_PCM_S16BE:

  340.                 case CODEC_ID_PCM_U16LE:

  341.                 case CODEC_ID_PCM_U16BE:

  342.                 case CODEC_ID_PCM_S8:

  343.                 case CODEC_ID_PCM_U8:

  344.                 case CODEC_ID_PCM_ALAW:

  345.                 case CODEC_ID_PCM_MULAW:

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

  347.                     break;

  348.                 default:

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

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

  351.                     break;

  352.                 }

  353.             } else if (type == CODEC_TYPE_VIDEO) {

  354.                 get_le32(pb);

  355.                 get_le32(pb);

  356.                 get_byte(pb);

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

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

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

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

  361.                 /* not available for asf */

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

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

  364.                 tag1 = get_le32(pb);

  365.                 url_fskip(pb, 20);

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

  367.                 size= sizeX;

  368.                 if (size > 40) {

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

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

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

  372.                 }

  373. 

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

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

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

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

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

  379. #if HAVE_BIGENDIAN

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

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

  382. #else

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

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

  385. #endif

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

  387.                 }

  388. 

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

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

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

  392.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  393.             }

  394.             pos2 = url_ftell(pb);

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

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

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

  398. 

  399.             len1 = get_le16(pb);

  400.             len2 = get_le16(pb);

  401.             len3 = get_le16(pb);

  402.             len4 = get_le16(pb);

  403.             len5 = get_le16(pb);

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

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

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

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

  408.             url_fskip(pb, len5);

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

  410.             int stream_count = get_le16(pb);

  411.             int j;

  412. 

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

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

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

  416.                 int flags, bitrate, stream_id;

  417. 

  418.                 flags= get_le16(pb);

  419.                 bitrate= get_le32(pb);

  420.                 stream_id= (flags & 0x7f);

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

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

  423.             }

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

  425.             int j;

  426.             int stream_count = get_le16(pb);

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

  428.                 char lang[6];

  429.                 unsigned int lang_len = get_byte(pb);

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

  431.                 if (j < 128)

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

  433.             }

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

  435.             int desc_count, i;

  436. 

  437.             desc_count = get_le16(pb);

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

  439.                     int name_len,value_type,value_len;

  440.                     char name[1024];

  441. 

  442.                     name_len = get_le16(pb);

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

  444.                         name_len += 1;

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

  446.                     value_type = get_le16(pb);

  447.                     value_len  = get_le16(pb);

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

  449.                         value_len += 1;

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

  451.             }

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

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

  454.             n = get_le16(pb);

  455. 

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

  457.                 char name[1024];

  458. 

  459.                 get_le16(pb); //lang_list_index

  460.                 stream_num= get_le16(pb);

  461.                 name_len=   get_le16(pb);

  462.                 value_type= get_le16(pb);

  463.                 value_len=  get_le32(pb);

  464. 

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

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

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

  468.                 url_fskip(pb, value_len - 2);

  469. 

  470.                 if(stream_num<128){

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

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

  473.                 }

  474.             }

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

  476.             int ext_len, payload_ext_ct, stream_ct;

  477.             uint32_t ext_d, leak_rate, stream_num;

  478.             unsigned int stream_languageid_index;

  479. 

  480.             get_le64(pb); // starttime

  481.             get_le64(pb); // endtime

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

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

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

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

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

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

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

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

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

  491. 

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

  493.             if (stream_num < 128)

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

  495. 

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

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

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

  499. 

  500.             if (stream_num < 128)

  501.                 bitrate[stream_num] = leak_rate;

  502. 

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

  504.                 get_le16(pb);

  505.                 ext_len = get_le16(pb);

  506.                 url_fseek(pb, ext_len, SEEK_CUR);

  507.             }

  508. 

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

  510.                 get_guid(pb, &g);

  511.                 ext_d=get_le16(pb);

  512.                 ext_len=get_le32(pb);

  513.                 url_fseek(pb, ext_len, SEEK_CUR);

  514.             }

  515. 

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

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

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

  519.             int v1, v2;

  520.             get_guid(pb, &g);

  521.             v1 = get_le32(pb);

  522.             v2 = get_le16(pb);

  523. #if 0

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

  525.             int len, v1, n, num;

  526.             char str[256], *q;

  527.             char tag[16];

  528. 

  529.             get_guid(pb, &g);

  530.             print_guid(&g);

  531. 

  532.             n = get_le32(pb);

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

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

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

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

  537.                 len = get_le16(pb);

  538.                 q = tag;

  539.                 while (len > 0) {

  540.                     v1 = get_byte(pb);

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

  542.                         *q++ = v1;

  543.                     len--;

  544.                 }

  545.                 *q = '\0';

  546.             }

  547. #endif

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

  549.             return -1;

  550.         } else {

  551.             if (!s->keylen) {

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

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

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

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

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

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

  558.                 }

  559.             }

  560.             url_fseek(pb, gsize - 24, SEEK_CUR);

  561.         }

  562.     }

  563.     get_guid(pb, &g);

  564.     get_le64(pb);

  565.     get_byte(pb);

  566.     get_byte(pb);

  567.     if (url_feof(pb))

  568.         return -1;

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

  570.     asf->packet_size_left = 0;

  571. 

  572. 

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

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

  575.         if(stream_num>=0){

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

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

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

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

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

  581.                           &st->sample_aspect_ratio.den,

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

  583. //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);

  584. 

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

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

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

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

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

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

  591.                     if (iso6392)

  592.                         av_metadata_set(&st->metadata, "language", iso6392);

  593.                 }

  594.             }

  595.         }

  596.     }

  597. 

  598.     return 0;

  599. }

  600. 

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

  602.     switch (bits & 3) \

  603.     { \

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

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

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

  607.     default: var = defval; break; \

  608.     }

  609. 

  610. /**

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

  612.  * @param s demux context

  613.  * @param pb context to read data from

  614.  * @returns 0 on success, <0 on error

  615.  */

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

  617. {

  618.     ASFContext *asf = s->priv_data;

  619.     uint32_t packet_length, padsize;

  620.     int rsize = 8;

  621.     int c, d, e, off;

  622. 

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

  624.     off= 32768;

  625.     if (s->packet_size > 0)

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

  627. 

  628.     c=d=e=-1;

  629.     while(off-- > 0){

  630.         c=d; d=e;

  631.         e= get_byte(pb);

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

  633.             break;

  634.     }

  635. 

  636.     if (c != 0x82) {

  637.         /**

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

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

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

  641.          * the stream.

  642.          */

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

  644.             return AVERROR(EAGAIN);

  645.         if (!url_feof(pb))

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

  647.     }

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

  649.         if (d || e) {

  650.             if (!url_feof(pb))

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

  652.             return -1;

  653.         }

  654.         c= get_byte(pb);

  655.         d= get_byte(pb);

  656.         rsize+=3;

  657.     }else{

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

  659.     }

  660. 

  661.     asf->packet_flags    = c;

  662.     asf->packet_property = d;

  663. 

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

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

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

  667. 

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

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

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

  671.         return -1;

  672.     }

  673.     if(padsize >= packet_length){

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

  675.         return -1;

  676.     }

  677. 

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

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

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

  681. 

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

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

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

  685.     } else {

  686.         asf->packet_segments = 1;

  687.         asf->packet_segsizetype = 0x80;

  688.     }

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

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

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

  692.     asf->packet_padsize = padsize;

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

  694.     return 0;

  695. }

  696. 

  697. /**

  698.  *

  699.  * @return <0 if error

  700.  */

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

  702.     ASFContext *asf = s->priv_data;

  703.     int rsize = 1;

  704.     int num = get_byte(pb);

  705.     int64_t ts0, ts1;

  706. 

  707.     asf->packet_segments--;

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

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

  710.     // sequence should be ignored!

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

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

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

  714. //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);

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

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

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

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

  719.             return -1;

  720.         }

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

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

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

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

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

  726.             url_fskip(pb, 10);

  727.             ts0= get_le64(pb);

  728.             ts1= get_le64(pb);

  729.             url_fskip(pb, 12);

  730.             get_le32(pb);

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

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

  733.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  734.         }else

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

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

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

  738.         // multipacket - frag_offset is beginning timestamp

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

  740.         asf->packet_frag_offset = 0;

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

  742. 

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

  744.         rsize++;

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

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

  747.         return -1;

  748.     }

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

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

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

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

  753.             return -1;

  754.         }

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

  756.     } else {

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

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

  759.     }

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

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

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

  763.             return -1;

  764.     }

  765.     asf->packet_size_left -= rsize;

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

  767. 

  768.     return 0;

  769. }

  770. 

  771. /**

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

  773.  * with asf_get_packet()).

  774.  * @param s demux context

  775.  * @param pb context to read data from

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

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

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

  779.  */

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

  781. {

  782.     ASFContext *asf = s->priv_data;

  783.     ASFStream *asf_st = 0;

  784.     for (;;) {

  785.         if(url_feof(pb))

  786.             return AVERROR_EOF;

  787.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  792.             assert(ret>=0);

  793.             /* fail safe */

  794.             url_fskip(pb, ret);

  795. 

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

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

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

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

  800.             return 1;

  801.         }

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

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

  804.                 asf->packet_segments= 0;

  805.                 continue;

  806.             }

  807.             if (asf->stream_index < 0

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

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

  810.                 ) {

  811.                 asf->packet_time_start = 0;

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

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

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

  815.                 if(asf->stream_index < 0)

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

  817.                 continue;

  818.             }

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

  820.         }

  821.         asf_st = asf->asf_st;

  822. 

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

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

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

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

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

  828.             asf->packet_size_left--;

  829.             asf->packet_multi_size--;

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

  831.             {

  832.                 asf->packet_time_start = 0;

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

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

  835.                 continue;

  836.             }

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

  838.             //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);

  839.         }

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

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

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

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

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

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

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

  847.         }

  848. 

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

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

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

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

  853.                 asf_st->frag_offset = 0;

  854.                 av_free_packet(&asf_st->pkt);

  855.             }

  856.             /* new packet */

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

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

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

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

  861.             asf_st->pkt.pos =

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

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

  864. //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,

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

  866.             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)

  867.                 asf->packet_key_frame = 1;

  868.             if (asf->packet_key_frame)

  869.                 asf_st->pkt.flags |= PKT_FLAG_KEY;

  870.         }

  871. 

  872.         /* read data */

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

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

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

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

  877.         if (asf->packet_size_left < 0)

  878.             continue;

  879. 

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

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

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

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

  884.             continue;

  885.         }

  886. 

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

  888.                    asf->packet_frag_size);

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

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

  891.                             asf->packet_frag_size);

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

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

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

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

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

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

  898.                 int i;

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

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

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

  902.                     asf_st->frag_offset = 0;

  903.                     av_free_packet(&asf_st->pkt);

  904.                     continue;

  905.                 }

  906.             }

  907. 

  908.             /* return packet */

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

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

  911.                     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);

  912.               }else{

  913.                 /* packet descrambling */

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

  915.                 if (newdata) {

  916.                     int offset = 0;

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

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

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

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

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

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

  923. 

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

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

  926.                         memcpy(newdata + offset,

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

  928.                                asf_st->ds_chunk_size);

  929.                         offset += asf_st->ds_chunk_size;

  930.                     }

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

  932.                     asf_st->pkt.data = newdata;

  933.                 }

  934.               }

  935.             }

  936.             asf_st->frag_offset = 0;

  937.             *pkt= asf_st->pkt;

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

  939.             asf_st->pkt.size = 0;

  940.             asf_st->pkt.data = 0;

  941.             break; // packet completed

  942.         }

  943.     }

  944.     return 0;

  945. }

  946. 

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

  948. {

  949.     ASFContext *asf = s->priv_data;

  950. 

  951.     for (;;) {

  952.         int ret;

  953. 

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

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

  956.             return ret;

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

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

  959.         asf->packet_time_start = 0;

  960.     }

  961. 

  962.     return 0;

  963. }

  964. 

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

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

  967. // leftover information from previous reads

  968. static void asf_reset_header(AVFormatContext *s)

  969. {

  970.     ASFContext *asf = s->priv_data;

  971.     ASFStream *asf_st;

  972.     int i;

  973. 

  974.     asf->packet_nb_frames = 0;

  975.     asf->packet_size_left = 0;

  976.     asf->packet_segments = 0;

  977.     asf->packet_flags = 0;

  978.     asf->packet_property = 0;

  979.     asf->packet_timestamp = 0;

  980.     asf->packet_segsizetype = 0;

  981.     asf->packet_segments = 0;

  982.     asf->packet_seq = 0;

  983.     asf->packet_replic_size = 0;

  984.     asf->packet_key_frame = 0;

  985.     asf->packet_padsize = 0;

  986.     asf->packet_frag_offset = 0;

  987.     asf->packet_frag_size = 0;

  988.     asf->packet_frag_timestamp = 0;

  989.     asf->packet_multi_size = 0;

  990.     asf->packet_obj_size = 0;

  991.     asf->packet_time_delta = 0;

  992.     asf->packet_time_start = 0;

  993. 

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

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

  996.         av_free_packet(&asf_st->pkt);

  997.         asf_st->frag_offset=0;

  998.         asf_st->seq=0;

  999.     }

  1000.     asf->asf_st= NULL;

  1001. }

  1002. 

  1003. static int asf_read_close(AVFormatContext *s)

  1004. {

  1005.     int i;

  1006. 

  1007.     asf_reset_header(s);

  1008.     for(i=0;i<s->nb_streams;i++) {

  1009.         AVStream *st = s->streams[i];

  1010.         av_free(st->codec->palctrl);

  1011.     }

  1012.     return 0;

  1013. }

  1014. 

  1015. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  1016. {

  1017.     AVPacket pkt1, *pkt = &pkt1;

  1018.     ASFStream *asf_st;

  1019.     int64_t pts;

  1020.     int64_t pos= *ppos;

  1021.     int i;

  1022.     int64_t start_pos[s->nb_streams];

  1023. 

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

  1025.         start_pos[i]= pos;

  1026.     }

  1027. 

  1028.     if (s->packet_size > 0)

  1029.         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;

  1030.     *ppos= pos;

  1031.     url_fseek(s->pb, pos, SEEK_SET);

  1032. 

  1033. //printf("asf_read_pts\n");

  1034.     asf_reset_header(s);

  1035.     for(;;){

  1036.         if (av_read_frame(s, pkt) < 0){

  1037.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1038.             return AV_NOPTS_VALUE;

  1039.         }

  1040. 

  1041.         pts= pkt->pts;

  1042. 

  1043.         av_free_packet(pkt);

  1044.         if(pkt->flags&PKT_FLAG_KEY){

  1045.             i= pkt->stream_index;

  1046. 

  1047.             asf_st= s->streams[i]->priv_data;

  1048. 

  1049. //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);

  1050.             pos= asf_st->packet_pos;

  1051. 

  1052.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1053.             start_pos[i]= asf_st->packet_pos + 1;

  1054. 

  1055.             if(pkt->stream_index == stream_index)

  1056.                break;

  1057.         }

  1058.     }

  1059. 

  1060.     *ppos= pos;

  1061. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1062. 

  1063.     return pts;

  1064. }

  1065. 

  1066. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1067. {

  1068.     ff_asf_guid g;

  1069.     ASFContext *asf = s->priv_data;

  1070.     int64_t current_pos= url_ftell(s->pb);

  1071.     int i;

  1072. 

  1073.     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);

  1074.     get_guid(s->pb, &g);

  1075.     if (!guidcmp(&g, &index_guid)) {

  1076.         int64_t itime, last_pos=-1;

  1077.         int pct, ict;

  1078.         int64_t av_unused gsize= get_le64(s->pb);

  1079.         get_guid(s->pb, &g);

  1080.         itime=get_le64(s->pb);

  1081.         pct=get_le32(s->pb);

  1082.         ict=get_le32(s->pb);

  1083.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1084. 

  1085.         for (i=0;i<ict;i++){

  1086.             int pktnum=get_le32(s->pb);

  1087.             int pktct =get_le16(s->pb);

  1088.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1089.             int64_t index_pts= av_rescale(itime, i, 10000);

  1090. 

  1091.             if(pos != last_pos){

  1092.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);

  1093.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1094.             last_pos=pos;

  1095.             }

  1096.         }

  1097.         asf->index_read= 1;

  1098.     }

  1099.     url_fseek(s->pb, current_pos, SEEK_SET);

  1100. }

  1101. 

  1102. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1103. {

  1104.     ASFContext *asf = s->priv_data;

  1105.     AVStream *st = s->streams[stream_index];

  1106.     int64_t pos;

  1107.     int index;

  1108. 

  1109.     if (s->packet_size <= 0)

  1110.         return -1;

  1111. 

  1112.     /* Try using the protocol's read_seek if available */

  1113.     if(s->pb) {

  1114.         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);

  1115.         if(ret >= 0)

  1116.             asf_reset_header(s);

  1117.         if (ret != AVERROR(ENOSYS))

  1118.             return ret;

  1119.     }

  1120. 

  1121.     if (!asf->index_read)

  1122.         asf_build_simple_index(s, stream_index);

  1123. 

  1124.     if(!(asf->index_read && st->index_entries)){

  1125.         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)

  1126.             return -1;

  1127.     }else{

  1128.         index= av_index_search_timestamp(st, pts, flags);

  1129.         if(index<0)

  1130.             return -1;

  1131. 

  1132.         /* find the position */

  1133.         pos = st->index_entries[index].pos;

  1134. 

  1135.     // various attempts to find key frame have failed so far

  1136.     //    asf_reset_header(s);

  1137.     //    url_fseek(s->pb, pos, SEEK_SET);

  1138.     //    key_pos = pos;

  1139.     //     for(i=0;i<16;i++){

  1140.     //         pos = url_ftell(s->pb);

  1141.     //         if (av_read_frame(s, &pkt) < 0){

  1142.     //             av_log(s, AV_LOG_INFO, "seek failed\n");

  1143.     //             return -1;

  1144.     //         }

  1145.     //         asf_st = s->streams[stream_index]->priv_data;

  1146.     //         pos += st->parser->frame_offset;

  1147.     //

  1148.     //         if (pkt.size > b) {

  1149.     //             b = pkt.size;

  1150.     //             key_pos = pos;

  1151.     //         }

  1152.     //

  1153.     //         av_free_packet(&pkt);

  1154.     //     }

  1155. 

  1156.         /* do the seek */

  1157.         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1158.         url_fseek(s->pb, pos, SEEK_SET);

  1159.     }

  1160.     asf_reset_header(s);

  1161.     return 0;

  1162. }

  1163. 

  1164. AVInputFormat asf_demuxer = {

  1165.     "asf",

  1166.     NULL_IF_CONFIG_SMALL("ASF format"),

  1167.     sizeof(ASFContext),

  1168.     asf_probe,

  1169.     asf_read_header,

  1170.     asf_read_packet,

  1171.     asf_read_close,

  1172.     asf_read_seek,

  1173.     asf_read_pts,

  1174.     .metadata_conv = ff_asf_metadata_conv,

  1175. };