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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.     if (!strncmp(key, "WM/", 3))

  179.         key += 3;

  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.         get_guid(pb, &g);

  209.         gsize = get_le64(pb);

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

  211.         print_guid(&g);

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

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

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

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

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

  217.                 asf->data_object_size = gsize - 24;

  218.             } else {

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

  220.             }

  221.             break;

  222.         }

  223.         if (gsize < 24)

  224.             return -1;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  240.             enum CodecType type;

  241.             int type_specific_size, sizeX;

  242.             uint64_t total_size;

  243.             unsigned int tag1;

  244.             int64_t pos1, pos2, start_time;

  245.             int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  246. 

  247.             pos1 = url_ftell(pb);

  248. 

  249.             st = av_new_stream(s, 0);

  250.             if (!st)

  251.                 return AVERROR(ENOMEM);

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

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

  254.             if (!asf_st)

  255.                 return AVERROR(ENOMEM);

  256.             st->priv_data = asf_st;

  257.             start_time = asf->hdr.preroll;

  258. 

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

  260. 

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

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

  263.                     (10000000 / 1000) - start_time;

  264.             }

  265.             get_guid(pb, &g);

  266. 

  267.             test_for_ext_stream_audio = 0;

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

  269.                 type = CODEC_TYPE_AUDIO;

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

  271.                 type = CODEC_TYPE_VIDEO;

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

  273.                 type = CODEC_TYPE_DATA;

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

  275.                 test_for_ext_stream_audio = 1;

  276.                 type = CODEC_TYPE_UNKNOWN;

  277.             } else {

  278.                 return -1;

  279.             }

  280.             get_guid(pb, &g);

  281.             total_size = get_le64(pb);

  282.             type_specific_size = get_le32(pb);

  283.             get_le32(pb);

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

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

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

  287. 

  288.             get_le32(pb);

  289. 

  290.             if (test_for_ext_stream_audio) {

  291.                 get_guid(pb, &g);

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

  293.                     type = CODEC_TYPE_AUDIO;

  294.                     is_dvr_ms_audio=1;

  295.                     get_guid(pb, &g);

  296.                     get_le32(pb);

  297.                     get_le32(pb);

  298.                     get_le32(pb);

  299.                     get_guid(pb, &g);

  300.                     get_le32(pb);

  301.                 }

  302.             }

  303. 

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

  305.             if (type == CODEC_TYPE_AUDIO) {

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

  307.                 if (is_dvr_ms_audio) {

  308.                     // codec_id and codec_tag are unreliable in dvr_ms

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

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

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

  312.                 }

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

  314.                     st->need_parsing = AVSTREAM_PARSE_NONE;

  315.                 } else {

  316.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  317.                 }

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

  319.                 pos2 = url_ftell(pb);

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

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

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

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

  324.                     get_le16(pb); //ds_data_size

  325.                     get_byte(pb); //ds_silence_data

  326.                 }

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

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

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

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

  331.                     if (!asf_st->ds_chunk_size

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

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

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

  335.                 }

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

  337.                 case CODEC_ID_MP3:

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

  339.                     break;

  340.                 case CODEC_ID_PCM_S16LE:

  341.                 case CODEC_ID_PCM_S16BE:

  342.                 case CODEC_ID_PCM_U16LE:

  343.                 case CODEC_ID_PCM_U16BE:

  344.                 case CODEC_ID_PCM_S8:

  345.                 case CODEC_ID_PCM_U8:

  346.                 case CODEC_ID_PCM_ALAW:

  347.                 case CODEC_ID_PCM_MULAW:

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

  349.                     break;

  350.                 default:

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

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

  353.                     break;

  354.                 }

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

  356.                 get_le32(pb);

  357.                 get_le32(pb);

  358.                 get_byte(pb);

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

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

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

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

  363.                 /* not available for asf */

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

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

  366.                 tag1 = get_le32(pb);

  367.                 url_fskip(pb, 20);

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

  369.                 size= sizeX;

  370.                 if (size > 40) {

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

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

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

  374.                 }

  375. 

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

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

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

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

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

  381. #if HAVE_BIGENDIAN

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

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

  384. #else

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

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

  387. #endif

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

  389.                 }

  390. 

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

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

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

  394.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  395.             }

  396.             pos2 = url_ftell(pb);

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

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

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

  400. 

  401.             len1 = get_le16(pb);

  402.             len2 = get_le16(pb);

  403.             len3 = get_le16(pb);

  404.             len4 = get_le16(pb);

  405.             len5 = get_le16(pb);

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

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

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

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

  410.             url_fskip(pb, len5);

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

  412.             int stream_count = get_le16(pb);

  413.             int j;

  414. 

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

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

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

  418.                 int flags, bitrate, stream_id;

  419. 

  420.                 flags= get_le16(pb);

  421.                 bitrate= get_le32(pb);

  422.                 stream_id= (flags & 0x7f);

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

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

  425.             }

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

  427.             int j;

  428.             int stream_count = get_le16(pb);

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

  430.                 char lang[6];

  431.                 unsigned int lang_len = get_byte(pb);

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

  433.                 if (j < 128)

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

  435.             }

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

  437.             int desc_count, i;

  438. 

  439.             desc_count = get_le16(pb);

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

  441.                     int name_len,value_type,value_len;

  442.                     char name[1024];

  443. 

  444.                     name_len = get_le16(pb);

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

  446.                         name_len += 1;

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

  448.                     value_type = get_le16(pb);

  449.                     value_len  = get_le16(pb);

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

  451.                         value_len += 1;

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

  453.             }

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

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

  456.             n = get_le16(pb);

  457. 

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

  459.                 char name[1024];

  460. 

  461.                 get_le16(pb); //lang_list_index

  462.                 stream_num= get_le16(pb);

  463.                 name_len=   get_le16(pb);

  464.                 value_type= get_le16(pb);

  465.                 value_len=  get_le32(pb);

  466. 

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

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

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

  470.                 url_fskip(pb, value_len - 2);

  471. 

  472.                 if(stream_num<128){

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

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

  475.                 }

  476.             }

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

  478.             int ext_len, payload_ext_ct, stream_ct;

  479.             uint32_t ext_d, leak_rate, stream_num;

  480.             unsigned int stream_languageid_index;

  481. 

  482.             get_le64(pb); // starttime

  483.             get_le64(pb); // endtime

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

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

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

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

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

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

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

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

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

  493. 

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

  495.             if (stream_num < 128)

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

  497. 

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

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

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

  501. 

  502.             if (stream_num < 128)

  503.                 bitrate[stream_num] = leak_rate;

  504. 

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

  506.                 get_le16(pb);

  507.                 ext_len = get_le16(pb);

  508.                 url_fseek(pb, ext_len, SEEK_CUR);

  509.             }

  510. 

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

  512.                 get_guid(pb, &g);

  513.                 ext_d=get_le16(pb);

  514.                 ext_len=get_le32(pb);

  515.                 url_fseek(pb, ext_len, SEEK_CUR);

  516.             }

  517. 

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

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

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

  521.             int v1, v2;

  522.             get_guid(pb, &g);

  523.             v1 = get_le32(pb);

  524.             v2 = get_le16(pb);

  525. #if 0

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

  527.             int len, v1, n, num;

  528.             char str[256], *q;

  529.             char tag[16];

  530. 

  531.             get_guid(pb, &g);

  532.             print_guid(&g);

  533. 

  534.             n = get_le32(pb);

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

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

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

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

  539.                 len = get_le16(pb);

  540.                 q = tag;

  541.                 while (len > 0) {

  542.                     v1 = get_byte(pb);

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

  544.                         *q++ = v1;

  545.                     len--;

  546.                 }

  547.                 *q = '\0';

  548.             }

  549. #endif

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

  551.             return -1;

  552.         } else {

  553.             if (!s->keylen) {

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

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

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

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

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

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

  560.                 }

  561.             }

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

  563.         }

  564.     }

  565.     get_guid(pb, &g);

  566.     get_le64(pb);

  567.     get_byte(pb);

  568.     get_byte(pb);

  569.     if (url_feof(pb))

  570.         return -1;

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

  572.     asf->packet_size_left = 0;

  573. 

  574. 

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

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

  577.         if(stream_num>=0){

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

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

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

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

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

  583.                           &st->sample_aspect_ratio.den,

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

  585. //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);

  586. 

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

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

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

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

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

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

  593.                     if (iso6392)

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

  595.                 }

  596.             }

  597.         }

  598.     }

  599. 

  600.     return 0;

  601. }

  602. 

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

  604.     switch (bits & 3) \

  605.     { \

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

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

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

  609.     default: var = defval; break; \

  610.     }

  611. 

  612. /**

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

  614.  * @param s demux context

  615.  * @param pb context to read data from

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

  617.  */

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

  619. {

  620.     ASFContext *asf = s->priv_data;

  621.     uint32_t packet_length, padsize;

  622.     int rsize = 8;

  623.     int c, d, e, off;

  624. 

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

  626.     off= 32768;

  627.     if (s->packet_size > 0)

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

  629. 

  630.     c=d=e=-1;

  631.     while(off-- > 0){

  632.         c=d; d=e;

  633.         e= get_byte(pb);

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

  635.             break;

  636.     }

  637. 

  638.     if (c != 0x82) {

  639.         /**

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

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

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

  643.          * the stream.

  644.          */

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

  646.             return AVERROR(EAGAIN);

  647.         if (!url_feof(pb))

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

  649.     }

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

  651.         if (d || e) {

  652.             if (!url_feof(pb))

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

  654.             return -1;

  655.         }

  656.         c= get_byte(pb);

  657.         d= get_byte(pb);

  658.         rsize+=3;

  659.     }else{

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

  661.     }

  662. 

  663.     asf->packet_flags    = c;

  664.     asf->packet_property = d;

  665. 

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

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

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

  669. 

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

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

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

  673.         return -1;

  674.     }

  675.     if(padsize >= packet_length){

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

  677.         return -1;

  678.     }

  679. 

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

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

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

  683. 

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

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

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

  687.     } else {

  688.         asf->packet_segments = 1;

  689.         asf->packet_segsizetype = 0x80;

  690.     }

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

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

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

  694.     asf->packet_padsize = padsize;

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

  696.     return 0;

  697. }

  698. 

  699. /**

  700.  *

  701.  * @return <0 if error

  702.  */

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

  704.     ASFContext *asf = s->priv_data;

  705.     int rsize = 1;

  706.     int num = get_byte(pb);

  707.     int64_t ts0, ts1;

  708. 

  709.     asf->packet_segments--;

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

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

  712.     // sequence should be ignored!

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

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

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

  716. //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);

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

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

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

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

  721.             return -1;

  722.         }

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

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

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

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

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

  728.             url_fskip(pb, 10);

  729.             ts0= get_le64(pb);

  730.             ts1= get_le64(pb);

  731.             url_fskip(pb, 12);

  732.             get_le32(pb);

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

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

  735.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  736.         }else

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

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

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

  740.         // multipacket - frag_offset is beginning timestamp

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

  742.         asf->packet_frag_offset = 0;

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

  744. 

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

  746.         rsize++;

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

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

  749.         return -1;

  750.     }

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

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

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

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

  755.             return -1;

  756.         }

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

  758.     } else {

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

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

  761.     }

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

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

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

  765.             return -1;

  766.     }

  767.     asf->packet_size_left -= rsize;

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

  769. 

  770.     return 0;

  771. }

  772. 

  773. /**

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

  775.  * with asf_get_packet()).

  776.  * @param s demux context

  777.  * @param pb context to read data from

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

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

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

  781.  */

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

  783. {

  784.     ASFContext *asf = s->priv_data;

  785.     ASFStream *asf_st = 0;

  786.     for (;;) {

  787.         if(url_feof(pb))

  788.             return AVERROR_EOF;

  789.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  794.             assert(ret>=0);

  795.             /* fail safe */

  796.             url_fskip(pb, ret);

  797. 

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

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

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

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

  802.             return 1;

  803.         }

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

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

  806.                 asf->packet_segments= 0;

  807.                 continue;

  808.             }

  809.             if (asf->stream_index < 0

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

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

  812.                 ) {

  813.                 asf->packet_time_start = 0;

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

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

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

  817.                 if(asf->stream_index < 0)

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

  819.                 continue;

  820.             }

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

  822.         }

  823.         asf_st = asf->asf_st;

  824. 

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

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

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

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

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

  830.             asf->packet_size_left--;

  831.             asf->packet_multi_size--;

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

  833.             {

  834.                 asf->packet_time_start = 0;

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

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

  837.                 continue;

  838.             }

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

  840.             //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);

  841.         }

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

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

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

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

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

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

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

  849.         }

  850. 

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

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

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

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

  855.                 asf_st->frag_offset = 0;

  856.                 av_free_packet(&asf_st->pkt);

  857.             }

  858.             /* new packet */

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

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

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

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

  863.             asf_st->pkt.pos =

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

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

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

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

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

  869.                 asf->packet_key_frame = 1;

  870.             if (asf->packet_key_frame)

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

  872.         }

  873. 

  874.         /* read data */

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

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

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

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

  879.         if (asf->packet_size_left < 0)

  880.             continue;

  881. 

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

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

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

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

  886.             continue;

  887.         }

  888. 

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

  890.                    asf->packet_frag_size);

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

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

  893.                             asf->packet_frag_size);

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

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

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

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

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

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

  900.                 int i;

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

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

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

  904.                     asf_st->frag_offset = 0;

  905.                     av_free_packet(&asf_st->pkt);

  906.                     continue;

  907.                 }

  908.             }

  909. 

  910.             /* return packet */

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

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

  913.                     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);

  914.               }else{

  915.                 /* packet descrambling */

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

  917.                 if (newdata) {

  918.                     int offset = 0;

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

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

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

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

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

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

  925. 

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

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

  928.                         memcpy(newdata + offset,

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

  930.                                asf_st->ds_chunk_size);

  931.                         offset += asf_st->ds_chunk_size;

  932.                     }

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

  934.                     asf_st->pkt.data = newdata;

  935.                 }

  936.               }

  937.             }

  938.             asf_st->frag_offset = 0;

  939.             *pkt= asf_st->pkt;

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

  941.             asf_st->pkt.size = 0;

  942.             asf_st->pkt.data = 0;

  943.             break; // packet completed

  944.         }

  945.     }

  946.     return 0;

  947. }

  948. 

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

  950. {

  951.     ASFContext *asf = s->priv_data;

  952. 

  953.     for (;;) {

  954.         int ret;

  955. 

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

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

  958.             return ret;

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

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

  961.         asf->packet_time_start = 0;

  962.     }

  963. 

  964.     return 0;

  965. }

  966. 

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

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

  969. // leftover information from previous reads

  970. static void asf_reset_header(AVFormatContext *s)

  971. {

  972.     ASFContext *asf = s->priv_data;

  973.     ASFStream *asf_st;

  974.     int i;

  975. 

  976.     asf->packet_nb_frames = 0;

  977.     asf->packet_size_left = 0;

  978.     asf->packet_segments = 0;

  979.     asf->packet_flags = 0;

  980.     asf->packet_property = 0;

  981.     asf->packet_timestamp = 0;

  982.     asf->packet_segsizetype = 0;

  983.     asf->packet_segments = 0;

  984.     asf->packet_seq = 0;

  985.     asf->packet_replic_size = 0;

  986.     asf->packet_key_frame = 0;

  987.     asf->packet_padsize = 0;

  988.     asf->packet_frag_offset = 0;

  989.     asf->packet_frag_size = 0;

  990.     asf->packet_frag_timestamp = 0;

  991.     asf->packet_multi_size = 0;

  992.     asf->packet_obj_size = 0;

  993.     asf->packet_time_delta = 0;

  994.     asf->packet_time_start = 0;

  995. 

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

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

  998.         av_free_packet(&asf_st->pkt);

  999.         asf_st->frag_offset=0;

  1000.         asf_st->seq=0;

  1001.     }

  1002.     asf->asf_st= NULL;

  1003. }

  1004. 

  1005. static int asf_read_close(AVFormatContext *s)

  1006. {

  1007.     int i;

  1008. 

  1009.     asf_reset_header(s);

  1010.     for(i=0;i<s->nb_streams;i++) {

  1011.         AVStream *st = s->streams[i];

  1012.         av_free(st->codec->palctrl);

  1013.     }

  1014.     return 0;

  1015. }

  1016. 

  1017. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  1018. {

  1019.     AVPacket pkt1, *pkt = &pkt1;

  1020.     ASFStream *asf_st;

  1021.     int64_t pts;

  1022.     int64_t pos= *ppos;

  1023.     int i;

  1024.     int64_t start_pos[s->nb_streams];

  1025. 

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

  1027.         start_pos[i]= pos;

  1028.     }

  1029. 

  1030.     if (s->packet_size > 0)

  1031.         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;

  1032.     *ppos= pos;

  1033.     url_fseek(s->pb, pos, SEEK_SET);

  1034. 

  1035. //printf("asf_read_pts\n");

  1036.     asf_reset_header(s);

  1037.     for(;;){

  1038.         if (av_read_frame(s, pkt) < 0){

  1039.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1040.             return AV_NOPTS_VALUE;

  1041.         }

  1042. 

  1043.         pts= pkt->pts;

  1044. 

  1045.         av_free_packet(pkt);

  1046.         if(pkt->flags&PKT_FLAG_KEY){

  1047.             i= pkt->stream_index;

  1048. 

  1049.             asf_st= s->streams[i]->priv_data;

  1050. 

  1051. //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);

  1052.             pos= asf_st->packet_pos;

  1053. 

  1054.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1055.             start_pos[i]= asf_st->packet_pos + 1;

  1056. 

  1057.             if(pkt->stream_index == stream_index)

  1058.                break;

  1059.         }

  1060.     }

  1061. 

  1062.     *ppos= pos;

  1063. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1064. 

  1065.     return pts;

  1066. }

  1067. 

  1068. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1069. {

  1070.     ff_asf_guid g;

  1071.     ASFContext *asf = s->priv_data;

  1072.     int64_t current_pos= url_ftell(s->pb);

  1073.     int i;

  1074. 

  1075.     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);

  1076.     get_guid(s->pb, &g);

  1077.     if (!guidcmp(&g, &index_guid)) {

  1078.         int64_t itime, last_pos=-1;

  1079.         int pct, ict;

  1080.         int64_t av_unused gsize= get_le64(s->pb);

  1081.         get_guid(s->pb, &g);

  1082.         itime=get_le64(s->pb);

  1083.         pct=get_le32(s->pb);

  1084.         ict=get_le32(s->pb);

  1085.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1086. 

  1087.         for (i=0;i<ict;i++){

  1088.             int pktnum=get_le32(s->pb);

  1089.             int pktct =get_le16(s->pb);

  1090.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1091.             int64_t index_pts= av_rescale(itime, i, 10000);

  1092. 

  1093.             if(pos != last_pos){

  1094.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);

  1095.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1096.             last_pos=pos;

  1097.             }

  1098.         }

  1099.         asf->index_read= 1;

  1100.     }

  1101.     url_fseek(s->pb, current_pos, SEEK_SET);

  1102. }

  1103. 

  1104. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1105. {

  1106.     ASFContext *asf = s->priv_data;

  1107.     AVStream *st = s->streams[stream_index];

  1108.     int64_t pos;

  1109.     int index;

  1110. 

  1111.     if (s->packet_size <= 0)

  1112.         return -1;

  1113. 

  1114.     /* Try using the protocol's read_seek if available */

  1115.     if(s->pb) {

  1116.         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);

  1117.         if(ret >= 0)

  1118.             asf_reset_header(s);

  1119.         if (ret != AVERROR(ENOSYS))

  1120.             return ret;

  1121.     }

  1122. 

  1123.     if (!asf->index_read)

  1124.         asf_build_simple_index(s, stream_index);

  1125. 

  1126.     if(!(asf->index_read && st->index_entries)){

  1127.         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)

  1128.             return -1;

  1129.     }else{

  1130.         index= av_index_search_timestamp(st, pts, flags);

  1131.         if(index<0)

  1132.             return -1;

  1133. 

  1134.         /* find the position */

  1135.         pos = st->index_entries[index].pos;

  1136. 

  1137.     // various attempts to find key frame have failed so far

  1138.     //    asf_reset_header(s);

  1139.     //    url_fseek(s->pb, pos, SEEK_SET);

  1140.     //    key_pos = pos;

  1141.     //     for(i=0;i<16;i++){

  1142.     //         pos = url_ftell(s->pb);

  1143.     //         if (av_read_frame(s, &pkt) < 0){

  1144.     //             av_log(s, AV_LOG_INFO, "seek failed\n");

  1145.     //             return -1;

  1146.     //         }

  1147.     //         asf_st = s->streams[stream_index]->priv_data;

  1148.     //         pos += st->parser->frame_offset;

  1149.     //

  1150.     //         if (pkt.size > b) {

  1151.     //             b = pkt.size;

  1152.     //             key_pos = pos;

  1153.     //         }

  1154.     //

  1155.     //         av_free_packet(&pkt);

  1156.     //     }

  1157. 

  1158.         /* do the seek */

  1159.         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1160.         url_fseek(s->pb, pos, SEEK_SET);

  1161.     }

  1162.     asf_reset_header(s);

  1163.     return 0;

  1164. }

  1165. 

  1166. AVInputFormat asf_demuxer = {

  1167.     "asf",

  1168.     NULL_IF_CONFIG_SMALL("ASF format"),

  1169.     sizeof(ASFContext),

  1170.     asf_probe,

  1171.     asf_read_header,

  1172.     asf_read_packet,

  1173.     asf_read_close,

  1174.     asf_read_seek,

  1175.     asf_read_pts,

  1176.     .metadata_conv = ff_asf_metadata_conv,

  1177. };