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FFmpeg/libavformat/asf.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. #include "libavutil/common.h"

  23. #include "libavcodec/mpegaudio.h"

  24. #include "avformat.h"

  25. #include "riff.h"

  26. #include "asf.h"

  27. #include "asfcrypt.h"

  28. 

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

  30. 

  31. #undef NDEBUG

  32. #include <assert.h>

  33. 

  34. #define FRAME_HEADER_SIZE 17

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

  36. 

  37. static const GUID index_guid = {

  38.     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb

  39. };

  40. 

  41. static const GUID stream_bitrate_guid = { /* (http://get.to/sdp) */

  42.     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2

  43. };

  44. /**********************************/

  45. /* decoding */

  46. 

  47. //#define DEBUG

  48. 

  49. #ifdef DEBUG

  50. #define PRINT_IF_GUID(g,cmp) \

  51. if (!memcmp(g, &cmp, sizeof(GUID))) \

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

  53. 

  54. static void print_guid(const GUID *g)

  55. {

  56.     int i;

  57.     PRINT_IF_GUID(g, asf_header);

  58.     else PRINT_IF_GUID(g, file_header);

  59.     else PRINT_IF_GUID(g, stream_header);

  60.     else PRINT_IF_GUID(g, audio_stream);

  61.     else PRINT_IF_GUID(g, audio_conceal_none);

  62.     else PRINT_IF_GUID(g, video_stream);

  63.     else PRINT_IF_GUID(g, video_conceal_none);

  64.     else PRINT_IF_GUID(g, command_stream);

  65.     else PRINT_IF_GUID(g, comment_header);

  66.     else PRINT_IF_GUID(g, codec_comment_header);

  67.     else PRINT_IF_GUID(g, codec_comment1_header);

  68.     else PRINT_IF_GUID(g, data_header);

  69.     else PRINT_IF_GUID(g, index_guid);

  70.     else PRINT_IF_GUID(g, head1_guid);

  71.     else PRINT_IF_GUID(g, head2_guid);

  72.     else PRINT_IF_GUID(g, my_guid);

  73.     else PRINT_IF_GUID(g, ext_stream_header);

  74.     else PRINT_IF_GUID(g, extended_content_header);

  75.     else PRINT_IF_GUID(g, ext_stream_embed_stream_header);

  76.     else PRINT_IF_GUID(g, ext_stream_audio_stream);

  77.     else PRINT_IF_GUID(g, metadata_header);

  78.     else PRINT_IF_GUID(g, stream_bitrate_guid);

  79.     else

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

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

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

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

  84. }

  85. #undef PRINT_IF_GUID

  86. #else

  87. #define print_guid(g)

  88. #endif

  89. 

  90. static void get_guid(ByteIOContext *s, GUID *g)

  91. {

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

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

  94. }

  95. 

  96. #if 0

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

  98. {

  99.     int len, c;

  100.     char *q;

  101. 

  102.     len = get_le16(pb);

  103.     q = buf;

  104.     while (len > 0) {

  105.         c = get_le16(pb);

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

  107.             *q++ = c;

  108.         len--;

  109.     }

  110.     *q = '\0';

  111. }

  112. #endif

  113. 

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

  115. {

  116.     char* q = buf;

  117.     len /= 2;

  118.     while (len--) {

  119.         uint8_t tmp;

  120.         PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)

  121.     }

  122.     *q = '\0';

  123. }

  124. 

  125. static int asf_probe(AVProbeData *pd)

  126. {

  127.     /* check file header */

  128.     if (!memcmp(pd->buf, &asf_header, sizeof(GUID)))

  129.         return AVPROBE_SCORE_MAX;

  130.     else

  131.         return 0;

  132. }

  133. 

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

  135.     switch(type){

  136.         case 2: return get_le32(pb);

  137.         case 3: return get_le32(pb);

  138.         case 4: return get_le64(pb);

  139.         case 5: return get_le16(pb);

  140.         default:return INT_MIN;

  141.     }

  142. }

  143. 

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

  145. {

  146.     ASFContext *asf = s->priv_data;

  147.     GUID g;

  148.     ByteIOContext *pb = s->pb;

  149.     AVStream *st;

  150.     ASFStream *asf_st;

  151.     int size, i;

  152.     int64_t gsize;

  153.     AVRational dar[128];

  154.     uint32_t bitrate[128];

  155. 

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

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

  158. 

  159.     get_guid(pb, &g);

  160.     if (memcmp(&g, &asf_header, sizeof(GUID)))

  161.         return -1;

  162.     get_le64(pb);

  163.     get_le32(pb);

  164.     get_byte(pb);

  165.     get_byte(pb);

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

  167.     for(;;) {

  168.         get_guid(pb, &g);

  169.         gsize = get_le64(pb);

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

  171.         print_guid(&g);

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

  173.         if (!memcmp(&g, &data_header, sizeof(GUID))) {

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

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

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

  177.                 asf->data_object_size = gsize - 24;

  178.             } else {

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

  180.             }

  181.             break;

  182.         }

  183.         if (gsize < 24)

  184.             return -1;

  185.         if (!memcmp(&g, &file_header, sizeof(GUID))) {

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

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

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

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

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

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

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

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

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

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

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

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

  198.             asf->packet_size = asf->hdr.max_pktsize;

  199.         } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {

  200.             int type, type_specific_size, sizeX;

  201.             uint64_t total_size;

  202.             unsigned int tag1;

  203.             int64_t pos1, pos2, start_time;

  204.             int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  205. 

  206.             pos1 = url_ftell(pb);

  207. 

  208.             st = av_new_stream(s, 0);

  209.             if (!st)

  210.                 return AVERROR(ENOMEM);

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

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

  213.             if (!asf_st)

  214.                 return AVERROR(ENOMEM);

  215.             st->priv_data = asf_st;

  216.             start_time = asf->hdr.preroll;

  217. 

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

  219.                 st->duration = asf->hdr.send_time /

  220.                     (10000000 / 1000) - start_time;

  221.             }

  222.             get_guid(pb, &g);

  223. 

  224.             test_for_ext_stream_audio = 0;

  225.             if (!memcmp(&g, &audio_stream, sizeof(GUID))) {

  226.                 type = CODEC_TYPE_AUDIO;

  227.             } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {

  228.                 type = CODEC_TYPE_VIDEO;

  229.             } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {

  230.                 type = CODEC_TYPE_DATA;

  231.             } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {

  232.                 test_for_ext_stream_audio = 1;

  233.                 type = CODEC_TYPE_UNKNOWN;

  234.             } else {

  235.                 return -1;

  236.             }

  237.             get_guid(pb, &g);

  238.             total_size = get_le64(pb);

  239.             type_specific_size = get_le32(pb);

  240.             get_le32(pb);

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

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

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

  244. 

  245.             get_le32(pb);

  246. 

  247.             if (test_for_ext_stream_audio) {

  248.                 get_guid(pb, &g);

  249.                 if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {

  250.                     type = CODEC_TYPE_AUDIO;

  251.                     is_dvr_ms_audio=1;

  252.                     get_guid(pb, &g);

  253.                     get_le32(pb);

  254.                     get_le32(pb);

  255.                     get_le32(pb);

  256.                     get_guid(pb, &g);

  257.                     get_le32(pb);

  258.                 }

  259.             }

  260. 

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

  262.             if (type == CODEC_TYPE_AUDIO) {

  263.                 get_wav_header(pb, st->codec, type_specific_size);

  264.                 if (is_dvr_ms_audio) {

  265.                     // codec_id and codec_tag are unreliable in dvr_ms

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

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

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

  269.                 }

  270.                 st->need_parsing = AVSTREAM_PARSE_FULL;

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

  272.                 pos2 = url_ftell(pb);

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

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

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

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

  277.                     get_le16(pb); //ds_data_size

  278.                     get_byte(pb); //ds_silence_data

  279.                 }

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

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

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

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

  284.                     if (!asf_st->ds_chunk_size

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

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

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

  288.                 }

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

  290.                 case CODEC_ID_MP3:

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

  292.                     break;

  293.                 case CODEC_ID_PCM_S16LE:

  294.                 case CODEC_ID_PCM_S16BE:

  295.                 case CODEC_ID_PCM_U16LE:

  296.                 case CODEC_ID_PCM_U16BE:

  297.                 case CODEC_ID_PCM_S8:

  298.                 case CODEC_ID_PCM_U8:

  299.                 case CODEC_ID_PCM_ALAW:

  300.                 case CODEC_ID_PCM_MULAW:

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

  302.                     break;

  303.                 default:

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

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

  306.                     break;

  307.                 }

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

  309.                 get_le32(pb);

  310.                 get_le32(pb);

  311.                 get_byte(pb);

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

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

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

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

  316.                 /* not available for asf */

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

  318.                 st->codec->bits_per_sample = get_le16(pb); /* depth */

  319.                 tag1 = get_le32(pb);

  320.                 url_fskip(pb, 20);

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

  322.                 size= sizeX;

  323.                 if (size > 40) {

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

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

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

  327.                 }

  328. 

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

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

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

  332.         if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {

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

  334. #ifdef WORDS_BIGENDIAN

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

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

  337. #else

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

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

  340. #endif

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

  342.         }

  343. 

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

  345.                 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);

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

  347.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  348.             }

  349.             pos2 = url_ftell(pb);

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

  351.         } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {

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

  353. 

  354.             len1 = get_le16(pb);

  355.             len2 = get_le16(pb);

  356.             len3 = get_le16(pb);

  357.             len4 = get_le16(pb);

  358.             len5 = get_le16(pb);

  359.             get_str16_nolen(pb, len1, s->title    , sizeof(s->title));

  360.             get_str16_nolen(pb, len2, s->author   , sizeof(s->author));

  361.             get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));

  362.             get_str16_nolen(pb, len4, s->comment  , sizeof(s->comment));

  363.             url_fskip(pb, len5);

  364.         } else if (!memcmp(&g, &stream_bitrate_guid, sizeof(GUID))) {

  365.             int stream_count = get_le16(pb);

  366.             int j;

  367. 

  368. //            av_log(NULL, AV_LOG_ERROR, "stream bitrate properties\n");

  369. //            av_log(NULL, AV_LOG_ERROR, "streams %d\n", streams);

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

  371.                 int flags, bitrate, stream_id;

  372. 

  373.                 flags= get_le16(pb);

  374.                 bitrate= get_le32(pb);

  375.                 stream_id= (flags & 0x7f);

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

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

  378.             }

  379.        } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {

  380.                 int desc_count, i;

  381. 

  382.                 desc_count = get_le16(pb);

  383.                 for(i=0;i<desc_count;i++)

  384.                 {

  385.                         int name_len,value_type,value_len;

  386.                         uint64_t value_num = 0;

  387.                         char name[1024];

  388. 

  389.                         name_len = get_le16(pb);

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

  391.                         value_type = get_le16(pb);

  392.                         value_len = get_le16(pb);

  393.                         if (value_type <= 1) // unicode or byte

  394.                         {

  395.                                 if     (!strcmp(name,"WM/AlbumTitle")) get_str16_nolen(pb, value_len, s->album, sizeof(s->album));

  396.                                 else if(!strcmp(name,"WM/Genre"     )) get_str16_nolen(pb, value_len, s->genre, sizeof(s->genre));

  397.                                 else if(!strcmp(name,"WM/Year"      )) {

  398.                                     char year[8];

  399.                                     get_str16_nolen(pb, value_len, year, sizeof(year));

  400.                                     s->year = atoi(year);

  401.                                 }

  402.                                 else if(!strcmp(name,"WM/Track") && s->track == 0) {

  403.                                     char track[8];

  404.                                     get_str16_nolen(pb, value_len, track, sizeof(track));

  405.                                     s->track = strtol(track, NULL, 10) + 1;

  406.                                 }

  407.                                 else if(!strcmp(name,"WM/TrackNumber")) {

  408.                                     char track[8];

  409.                                     get_str16_nolen(pb, value_len, track, sizeof(track));

  410.                                     s->track = strtol(track, NULL, 10);

  411.                                 }

  412.                                 else url_fskip(pb, value_len);

  413.                         }

  414.                         else if (value_type <= 5) // boolean or DWORD or QWORD or WORD

  415.                         {

  416.                                 value_num= get_value(pb, value_type);

  417.                                 if (!strcmp(name,"WM/Track"      ) && s->track == 0) s->track = value_num + 1;

  418.                                 if (!strcmp(name,"WM/TrackNumber")) s->track = value_num;

  419.                         }else

  420.                             url_fskip(pb, value_len);

  421.                 }

  422.         } else if (!memcmp(&g, &metadata_header, sizeof(GUID))) {

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

  424.             n = get_le16(pb);

  425. 

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

  427.                 char name[1024];

  428. 

  429.                 get_le16(pb); //lang_list_index

  430.                 stream_num= get_le16(pb);

  431.                 name_len=   get_le16(pb);

  432.                 value_type= get_le16(pb);

  433.                 value_len=  get_le32(pb);

  434. 

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

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

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

  438.                 url_fskip(pb, value_len - 2);

  439. 

  440.                 if(stream_num<128){

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

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

  443.                 }

  444.             }

  445.         } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {

  446.             int ext_len, payload_ext_ct, stream_ct;

  447.             uint32_t ext_d, leak_rate, stream_num;

  448.             int64_t pos_ex_st;

  449.             pos_ex_st = url_ftell(pb);

  450. 

  451.             get_le64(pb); // starttime

  452.             get_le64(pb); // endtime

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

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

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

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

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

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

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

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

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

  462.             get_le16(pb); // stream-language-id-index

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

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

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

  466. 

  467.             if (stream_num < 128)

  468.                 bitrate[stream_num] = leak_rate;

  469. 

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

  471.                 get_le16(pb);

  472.                 ext_len = get_le16(pb);

  473.                 url_fseek(pb, ext_len, SEEK_CUR);

  474.             }

  475. 

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

  477.                 get_guid(pb, &g);

  478.                 ext_d=get_le16(pb);

  479.                 ext_len=get_le32(pb);

  480.                 url_fseek(pb, ext_len, SEEK_CUR);

  481.             }

  482. 

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

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

  485.         } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {

  486.             int v1, v2;

  487.             get_guid(pb, &g);

  488.             v1 = get_le32(pb);

  489.             v2 = get_le16(pb);

  490. #if 0

  491.         } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {

  492.             int len, v1, n, num;

  493.             char str[256], *q;

  494.             char tag[16];

  495. 

  496.             get_guid(pb, &g);

  497.             print_guid(&g);

  498. 

  499.             n = get_le32(pb);

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

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

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

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

  504.                 len = get_le16(pb);

  505.                 q = tag;

  506.                 while (len > 0) {

  507.                     v1 = get_byte(pb);

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

  509.                         *q++ = v1;

  510.                     len--;

  511.                 }

  512.                 *q = '\0';

  513.             }

  514. #endif

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

  516.             return -1;

  517.         } else {

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

  519.         }

  520.     }

  521.     get_guid(pb, &g);

  522.     get_le64(pb);

  523.     get_byte(pb);

  524.     get_byte(pb);

  525.     if (url_feof(pb))

  526.         return -1;

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

  528.     asf->packet_size_left = 0;

  529. 

  530. 

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

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

  533.         if(stream_num>=0){

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

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

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

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

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

  539.                           &st->sample_aspect_ratio.den,

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

  541. //av_log(NULL, 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);

  542.         }

  543.     }

  544. 

  545.     return 0;

  546. }

  547. 

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

  549.     switch (bits & 3) \

  550.     { \

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

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

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

  554.     default: var = defval; break; \

  555.     }

  556. 

  557. /**

  558.  *

  559.  * @return <0 in case of an error

  560.  */

  561. static int asf_get_packet(AVFormatContext *s)

  562. {

  563.     ASFContext *asf = s->priv_data;

  564.     ByteIOContext *pb = s->pb;

  565.     uint32_t packet_length, padsize;

  566.     int rsize = 8;

  567.     int c, d, e, off;

  568. 

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

  570. 

  571.     c=d=e=-1;

  572.     while(off-- > 0){

  573.         c=d; d=e;

  574.         e= get_byte(pb);

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

  576.             break;

  577.     }

  578. 

  579.     if (c != 0x82) {

  580.         if (!url_feof(pb))

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

  582.     }

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

  584.         if (d || e) {

  585.             if (!url_feof(pb))

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

  587.             return -1;

  588.         }

  589.         c= get_byte(pb);

  590.         d= get_byte(pb);

  591.         rsize+=3;

  592.     }else{

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

  594.     }

  595. 

  596.     asf->packet_flags    = c;

  597.     asf->packet_property = d;

  598. 

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

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

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

  602. 

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

  604.     if(packet_length >= (1U<<29)){

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

  606.         return -1;

  607.     }

  608.     if(padsize >= packet_length){

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

  610.         return -1;

  611.     }

  612. 

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

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

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

  616. 

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

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

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

  620.     } else {

  621.         asf->packet_segments = 1;

  622.         asf->packet_segsizetype = 0x80;

  623.     }

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

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

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

  627.     asf->packet_padsize = padsize;

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

  629.     return 0;

  630. }

  631. 

  632. /**

  633.  *

  634.  * @return <0 if error

  635.  */

  636. static int asf_read_frame_header(AVFormatContext *s){

  637.     ASFContext *asf = s->priv_data;

  638.     ByteIOContext *pb = s->pb;

  639.     int rsize = 1;

  640.     int num = get_byte(pb);

  641.     int64_t ts0, ts1;

  642. 

  643.     asf->packet_segments--;

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

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

  646.     // sequence should be ignored!

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

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

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

  650. //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);

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

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

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

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

  655.             return -1;

  656.         }

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

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

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

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

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

  662.             url_fskip(pb, 10);

  663.             ts0= get_le64(pb);

  664.             ts1= get_le64(pb);

  665.             url_fskip(pb, 12);

  666.             get_le32(pb);

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

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

  669.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  670.         }else

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

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

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

  674.         // multipacket - frag_offset is beginning timestamp

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

  676.         asf->packet_frag_offset = 0;

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

  678. 

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

  680.         rsize++;

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

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

  683.         return -1;

  684.     }

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

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

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

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

  689.             return -1;

  690.         }

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

  692.     } else {

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

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

  695.     }

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

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

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

  699.             return -1;

  700.     }

  701.     asf->packet_size_left -= rsize;

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

  703. 

  704.     return 0;

  705. }

  706. 

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

  708. {

  709.     ASFContext *asf = s->priv_data;

  710.     ASFStream *asf_st = 0;

  711.     ByteIOContext *pb = s->pb;

  712.     //static int pc = 0;

  713.     for (;;) {

  714.         if(url_feof(pb))

  715.             return AVERROR(EIO);

  716.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  721.             assert(ret>=0);

  722.             /* fail safe */

  723.             url_fskip(pb, ret);

  724. 

  725.             asf->packet_pos= url_ftell(s->pb);

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

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

  728.                 return AVERROR(EIO); /* Do not exceed the size of the data object */

  729.             ret = asf_get_packet(s);

  730.             //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);

  731.             if (ret < 0)

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

  733.             asf->packet_time_start = 0;

  734.             continue;

  735.         }

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

  737.             if(asf_read_frame_header(s) < 0){

  738.                 asf->packet_segments= 0;

  739.                 continue;

  740.             }

  741.             if (asf->stream_index < 0

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

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

  744.                 ) {

  745.                 asf->packet_time_start = 0;

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

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

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

  749.                 if(asf->stream_index < 0)

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

  751.                 continue;

  752.             }

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

  754.         }

  755.         asf_st = asf->asf_st;

  756. 

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

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

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

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

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

  762.             asf->packet_size_left--;

  763.             asf->packet_multi_size--;

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

  765.             {

  766.                 asf->packet_time_start = 0;

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

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

  769.                 continue;

  770.             }

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

  772.             //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);

  773.         }

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

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

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

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

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

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

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

  781.         }

  782. 

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

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

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

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

  787.                 asf_st->frag_offset = 0;

  788.                 av_free_packet(&asf_st->pkt);

  789.             }

  790.             /* new packet */

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

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

  793.             asf_st->pkt.pts = asf->packet_frag_timestamp;

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

  795.             asf_st->pkt.pos =

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

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

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

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

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

  801.                 asf->packet_key_frame = 1;

  802.             if (asf->packet_key_frame)

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

  804.         }

  805. 

  806.         /* read data */

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

  808.         //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,

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

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

  811.         if (asf->packet_size_left < 0)

  812.             continue;

  813. 

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

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

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

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

  818.             continue;

  819.         }

  820. 

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

  822.                    asf->packet_frag_size);

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

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

  825.                             asf->packet_frag_size);

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

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

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

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

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

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

  832.                 int i;

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

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

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

  836.                     asf_st->frag_offset = 0;

  837.                     av_free_packet(&asf_st->pkt);

  838.                     continue;

  839.                 }

  840.             }

  841. 

  842.             /* return packet */

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

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

  845.                     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);

  846.               }else{

  847.                 /* packet descrambling */

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

  849.                 if (newdata) {

  850.                     int offset = 0;

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

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

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

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

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

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

  857. 

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

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

  860.                         memcpy(newdata + offset,

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

  862.                                asf_st->ds_chunk_size);

  863.                         offset += asf_st->ds_chunk_size;

  864.                     }

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

  866.                     asf_st->pkt.data = newdata;

  867.                 }

  868.               }

  869.             }

  870.             asf_st->frag_offset = 0;

  871.             *pkt= asf_st->pkt;

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

  873.             asf_st->pkt.size = 0;

  874.             asf_st->pkt.data = 0;

  875.             break; // packet completed

  876.         }

  877.     }

  878.     return 0;

  879. }

  880. 

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

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

  883. // leftover information from previous reads

  884. static void asf_reset_header(AVFormatContext *s)

  885. {

  886.     ASFContext *asf = s->priv_data;

  887.     ASFStream *asf_st;

  888.     int i;

  889. 

  890.     asf->packet_nb_frames = 0;

  891.     asf->packet_size_left = 0;

  892.     asf->packet_segments = 0;

  893.     asf->packet_flags = 0;

  894.     asf->packet_property = 0;

  895.     asf->packet_timestamp = 0;

  896.     asf->packet_segsizetype = 0;

  897.     asf->packet_segments = 0;

  898.     asf->packet_seq = 0;

  899.     asf->packet_replic_size = 0;

  900.     asf->packet_key_frame = 0;

  901.     asf->packet_padsize = 0;

  902.     asf->packet_frag_offset = 0;

  903.     asf->packet_frag_size = 0;

  904.     asf->packet_frag_timestamp = 0;

  905.     asf->packet_multi_size = 0;

  906.     asf->packet_obj_size = 0;

  907.     asf->packet_time_delta = 0;

  908.     asf->packet_time_start = 0;

  909. 

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

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

  912.         av_free_packet(&asf_st->pkt);

  913.         asf_st->frag_offset=0;

  914.         asf_st->seq=0;

  915.     }

  916.     asf->asf_st= NULL;

  917. }

  918. 

  919. static int asf_read_close(AVFormatContext *s)

  920. {

  921.     int i;

  922. 

  923.     asf_reset_header(s);

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

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

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

  927.     }

  928.     return 0;

  929. }

  930. 

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

  932. {

  933.     ASFContext *asf = s->priv_data;

  934.     AVPacket pkt1, *pkt = &pkt1;

  935.     ASFStream *asf_st;

  936.     int64_t pts;

  937.     int64_t pos= *ppos;

  938.     int i;

  939.     int64_t start_pos[s->nb_streams];

  940. 

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

  942.         start_pos[i]= pos;

  943.     }

  944. 

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

  946.     *ppos= pos;

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

  948. 

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

  950.     asf_reset_header(s);

  951.     for(;;){

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

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

  954.             return AV_NOPTS_VALUE;

  955.         }

  956. 

  957.         pts= pkt->pts;

  958. 

  959.         av_free_packet(pkt);

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

  961.             i= pkt->stream_index;

  962. 

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

  964. 

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

  966.             pos= asf_st->packet_pos;

  967. 

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

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

  970. 

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

  972.                break;

  973.         }

  974.     }

  975. 

  976.     *ppos= pos;

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

  978. 

  979.     return pts;

  980. }

  981. 

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

  983. {

  984.     GUID g;

  985.     ASFContext *asf = s->priv_data;

  986.     int64_t gsize, itime;

  987.     int64_t pos, current_pos, index_pts;

  988.     int i;

  989.     int pct,ict;

  990. 

  991.     current_pos = url_ftell(s->pb);

  992. 

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

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

  995.     if (!memcmp(&g, &index_guid, sizeof(GUID))) {

  996.         gsize = get_le64(s->pb);

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

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

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

  1000.         ict=get_le32(s->pb);

  1001.         av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1002. 

  1003.         for (i=0;i<ict;i++){

  1004.             int pktnum=get_le32(s->pb);

  1005.             int pktct =get_le16(s->pb);

  1006.             av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);

  1007. 

  1008.             pos=s->data_offset + asf->packet_size*(int64_t)pktnum;

  1009.             index_pts=av_rescale(itime, i, 10000);

  1010. 

  1011.             av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);

  1012.         }

  1013.         asf->index_read= 1;

  1014.     }

  1015.     url_fseek(s->pb, current_pos, SEEK_SET);

  1016. }

  1017. 

  1018. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1019. {

  1020.     ASFContext *asf = s->priv_data;

  1021.     AVStream *st = s->streams[stream_index];

  1022.     int64_t pos;

  1023.     int index;

  1024. 

  1025.     if (asf->packet_size <= 0)

  1026.         return -1;

  1027. 

  1028.     /* Try using the protocol's read_seek if available */

  1029.     if(s->pb) {

  1030.         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);

  1031.         if(ret >= 0)

  1032.             asf_reset_header(s);

  1033.         if (ret != AVERROR(ENOSYS))

  1034.             return ret;

  1035.     }

  1036. 

  1037.     if (!asf->index_read)

  1038.         asf_build_simple_index(s, stream_index);

  1039. 

  1040.     if(!(asf->index_read && st->index_entries)){

  1041.         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)

  1042.             return -1;

  1043.     }else{

  1044.         index= av_index_search_timestamp(st, pts, flags);

  1045.         if(index<0)

  1046.             return -1;

  1047. 

  1048.         /* find the position */

  1049.         pos = st->index_entries[index].pos;

  1050.         pts = st->index_entries[index].timestamp;

  1051. 

  1052.     // various attempts to find key frame have failed so far

  1053.     //    asf_reset_header(s);

  1054.     //    url_fseek(s->pb, pos, SEEK_SET);

  1055.     //    key_pos = pos;

  1056.     //     for(i=0;i<16;i++){

  1057.     //         pos = url_ftell(s->pb);

  1058.     //         if (av_read_frame(s, &pkt) < 0){

  1059.     //             av_log(s, AV_LOG_INFO, "seek failed\n");

  1060.     //             return -1;

  1061.     //         }

  1062.     //         asf_st = s->streams[stream_index]->priv_data;

  1063.     //         pos += st->parser->frame_offset;

  1064.     //

  1065.     //         if (pkt.size > b) {

  1066.     //             b = pkt.size;

  1067.     //             key_pos = pos;

  1068.     //         }

  1069.     //

  1070.     //         av_free_packet(&pkt);

  1071.     //     }

  1072. 

  1073.         /* do the seek */

  1074.         av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1075.         url_fseek(s->pb, pos, SEEK_SET);

  1076.     }

  1077.     asf_reset_header(s);

  1078.     return 0;

  1079. }

  1080. 

  1081. AVInputFormat asf_demuxer = {

  1082.     "asf",

  1083.     NULL_IF_CONFIG_SMALL("ASF format"),

  1084.     sizeof(ASFContext),

  1085.     asf_probe,

  1086.     asf_read_header,

  1087.     asf_read_packet,

  1088.     asf_read_close,

  1089.     asf_read_seek,

  1090.     asf_read_pts,

  1091. };