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FFmpeg/libavformat/asfdec.c

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  1. /*

  2.  * ASF compatible demuxer

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

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. //#define DEBUG

  23. 

  24. #include "libavutil/common.h"

  25. #include "libavutil/avstring.h"

  26. #include "libavcodec/mpegaudio.h"

  27. #include "avformat.h"

  28. #include "riff.h"

  29. #include "asf.h"

  30. #include "asfcrypt.h"

  31. #include "avlanguage.h"

  32. 

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

  34. 

  35. #undef NDEBUG

  36. #include <assert.h>

  37. 

  38. #define ASF_MAX_STREAMS 127

  39. #define FRAME_HEADER_SIZE 17

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

  41. 

  42. static const ff_asf_guid index_guid = {

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

  44. };

  45. 

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

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

  48. };

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

  50. /* decoding */

  51. 

  52. int ff_guidcmp(const void *g1, const void *g2)

  53. {

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

  55. }

  56. 

  57. #ifdef DEBUG

  58. #define PRINT_IF_GUID(g,cmp) \

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

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

  61. 

  62. static void print_guid(const ff_asf_guid *g)

  63. {

  64.     int i;

  65.     PRINT_IF_GUID(g, ff_asf_header);

  66.     else PRINT_IF_GUID(g, ff_asf_file_header);

  67.     else PRINT_IF_GUID(g, ff_asf_stream_header);

  68.     else PRINT_IF_GUID(g, ff_asf_audio_stream);

  69.     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);

  70.     else PRINT_IF_GUID(g, ff_asf_video_stream);

  71.     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);

  72.     else PRINT_IF_GUID(g, ff_asf_command_stream);

  73.     else PRINT_IF_GUID(g, ff_asf_comment_header);

  74.     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);

  75.     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);

  76.     else PRINT_IF_GUID(g, ff_asf_data_header);

  77.     else PRINT_IF_GUID(g, index_guid);

  78.     else PRINT_IF_GUID(g, ff_asf_head1_guid);

  79.     else PRINT_IF_GUID(g, ff_asf_head2_guid);

  80.     else PRINT_IF_GUID(g, ff_asf_my_guid);

  81.     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);

  82.     else PRINT_IF_GUID(g, ff_asf_extended_content_header);

  83.     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);

  84.     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);

  85.     else PRINT_IF_GUID(g, ff_asf_metadata_header);

  86.     else PRINT_IF_GUID(g, ff_asf_marker_header);

  87.     else PRINT_IF_GUID(g, stream_bitrate_guid);

  88.     else PRINT_IF_GUID(g, ff_asf_language_guid);

  89.     else

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

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

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

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

  94. }

  95. #undef PRINT_IF_GUID

  96. #else

  97. #define print_guid(g)

  98. #endif

  99. 

  100. void ff_get_guid(ByteIOContext *s, ff_asf_guid *g)

  101. {

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

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

  104. }

  105. 

  106. static int asf_probe(AVProbeData *pd)

  107. {

  108.     /* check file header */

  109.     if (!ff_guidcmp(pd->buf, &ff_asf_header))

  110.         return AVPROBE_SCORE_MAX;

  111.     else

  112.         return 0;

  113. }

  114. 

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

  116.     switch(type){

  117.         case 2: return get_le32(pb);

  118.         case 3: return get_le32(pb);

  119.         case 4: return get_le64(pb);

  120.         case 5: return get_le16(pb);

  121.         default:return INT_MIN;

  122.     }

  123. }

  124. 

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

  126. {

  127.     char *value;

  128.     int64_t off = url_ftell(s->pb);

  129. 

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

  131.         return;

  132. 

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

  134.     if (!value)

  135.         goto finish;

  136. 

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

  138.         avio_get_str16le(s->pb, len, value, 2*len + 1);

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

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

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

  142.     } else {

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

  144.         goto finish;

  145.     }

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

  147. finish:

  148.     av_freep(&value);

  149.     url_fseek(s->pb, off + len, SEEK_SET);

  150. }

  151. 

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

  153. {

  154.     ASFContext *asf = s->priv_data;

  155.     ff_asf_guid g;

  156.     ByteIOContext *pb = s->pb;

  157.     AVStream *st;

  158.     ASFStream *asf_st;

  159.     int size, i;

  160.     int64_t gsize;

  161.     AVRational dar[128];

  162.     uint32_t bitrate[128];

  163. 

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

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

  166. 

  167.     ff_get_guid(pb, &g);

  168.     if (ff_guidcmp(&g, &ff_asf_header))

  169.         return -1;

  170.     get_le64(pb);

  171.     get_le32(pb);

  172.     get_byte(pb);

  173.     get_byte(pb);

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

  175.     for(;;) {

  176.         uint64_t gpos= url_ftell(pb);

  177.         int ret;

  178.         ff_get_guid(pb, &g);

  179.         gsize = get_le64(pb);

  180.         av_dlog(s, "%08"PRIx64": ", gpos);

  181.         print_guid(&g);

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

  183.         if (!ff_guidcmp(&g, &ff_asf_data_header)) {

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

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

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

  187.                 asf->data_object_size = gsize - 24;

  188.             } else {

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

  190.             }

  191.             break;

  192.         }

  193.         if (gsize < 24)

  194.             return -1;

  195.         if (!ff_guidcmp(&g, &ff_asf_file_header)) {

  196.             ff_get_guid(pb, &asf->hdr.guid);

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

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

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

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

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

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

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

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

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

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

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

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

  209.         } else if (!ff_guidcmp(&g, &ff_asf_stream_header)) {

  210.             enum AVMediaType type;

  211.             int type_specific_size, sizeX;

  212.             uint64_t total_size;

  213.             unsigned int tag1;

  214.             int64_t pos1, pos2, start_time;

  215.             int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  216. 

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

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

  219.                 return AVERROR(EINVAL);

  220.             }

  221. 

  222.             pos1 = url_ftell(pb);

  223. 

  224.             st = av_new_stream(s, 0);

  225.             if (!st)

  226.                 return AVERROR(ENOMEM);

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

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

  229.             if (!asf_st)

  230.                 return AVERROR(ENOMEM);

  231.             st->priv_data = asf_st;

  232.             start_time = asf->hdr.preroll;

  233. 

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

  235. 

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

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

  238.                     (10000000 / 1000) - start_time;

  239.             }

  240.             ff_get_guid(pb, &g);

  241. 

  242.             test_for_ext_stream_audio = 0;

  243.             if (!ff_guidcmp(&g, &ff_asf_audio_stream)) {

  244.                 type = AVMEDIA_TYPE_AUDIO;

  245.             } else if (!ff_guidcmp(&g, &ff_asf_video_stream)) {

  246.                 type = AVMEDIA_TYPE_VIDEO;

  247.             } else if (!ff_guidcmp(&g, &ff_asf_jfif_media)) {

  248.                 type = AVMEDIA_TYPE_VIDEO;

  249.                 st->codec->codec_id = CODEC_ID_MJPEG;

  250.             } else if (!ff_guidcmp(&g, &ff_asf_command_stream)) {

  251.                 type = AVMEDIA_TYPE_DATA;

  252.             } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {

  253.                 test_for_ext_stream_audio = 1;

  254.                 type = AVMEDIA_TYPE_UNKNOWN;

  255.             } else {

  256.                 return -1;

  257.             }

  258.             ff_get_guid(pb, &g);

  259.             total_size = get_le64(pb);

  260.             type_specific_size = get_le32(pb);

  261.             get_le32(pb);

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

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

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

  265. 

  266.             get_le32(pb);

  267. 

  268.             if (test_for_ext_stream_audio) {

  269.                 ff_get_guid(pb, &g);

  270.                 if (!ff_guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {

  271.                     type = AVMEDIA_TYPE_AUDIO;

  272.                     is_dvr_ms_audio=1;

  273.                     ff_get_guid(pb, &g);

  274.                     get_le32(pb);

  275.                     get_le32(pb);

  276.                     get_le32(pb);

  277.                     ff_get_guid(pb, &g);

  278.                     get_le32(pb);

  279.                 }

  280.             }

  281. 

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

  283.             if (type == AVMEDIA_TYPE_AUDIO) {

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

  285.                 if (is_dvr_ms_audio) {

  286.                     // codec_id and codec_tag are unreliable in dvr_ms

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

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

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

  290.                 }

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

  292.                     st->need_parsing = AVSTREAM_PARSE_NONE;

  293.                 } else {

  294.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  295.                 }

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

  297.                 pos2 = url_ftell(pb);

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

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

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

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

  302.                     get_le16(pb); //ds_data_size

  303.                     get_byte(pb); //ds_silence_data

  304.                 }

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

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

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

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

  309.                     if (!asf_st->ds_chunk_size

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

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

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

  313.                 }

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

  315.                 case CODEC_ID_MP3:

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

  317.                     break;

  318.                 case CODEC_ID_PCM_S16LE:

  319.                 case CODEC_ID_PCM_S16BE:

  320.                 case CODEC_ID_PCM_U16LE:

  321.                 case CODEC_ID_PCM_U16BE:

  322.                 case CODEC_ID_PCM_S8:

  323.                 case CODEC_ID_PCM_U8:

  324.                 case CODEC_ID_PCM_ALAW:

  325.                 case CODEC_ID_PCM_MULAW:

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

  327.                     break;

  328.                 default:

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

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

  331.                     break;

  332.                 }

  333.             } else if (type == AVMEDIA_TYPE_VIDEO &&

  334.                        gsize - (url_ftell(pb) - pos1 + 24) >= 51) {

  335.                 get_le32(pb);

  336.                 get_le32(pb);

  337.                 get_byte(pb);

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

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

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

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

  342.                 /* not available for asf */

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

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

  345.                 tag1 = get_le32(pb);

  346.                 url_fskip(pb, 20);

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

  348.                 size= sizeX;

  349.                 if (size > 40) {

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

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

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

  353.                 }

  354. 

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

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

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

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

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

  360. #if HAVE_BIGENDIAN

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

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

  363. #else

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

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

  366. #endif

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

  368.                 }

  369. 

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

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

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

  373.                     st->need_parsing = AVSTREAM_PARSE_FULL;

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

  375.                     st->codec->width  =

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

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

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

  379.                 }

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

  381.                     st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;

  382.             }

  383.             pos2 = url_ftell(pb);

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

  385.         } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {

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

  387. 

  388.             len1 = get_le16(pb);

  389.             len2 = get_le16(pb);

  390.             len3 = get_le16(pb);

  391.             len4 = get_le16(pb);

  392.             len5 = get_le16(pb);

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

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

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

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

  397.             url_fskip(pb, len5);

  398.         } else if (!ff_guidcmp(&g, &stream_bitrate_guid)) {

  399.             int stream_count = get_le16(pb);

  400.             int j;

  401. 

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

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

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

  405.                 int flags, bitrate, stream_id;

  406. 

  407.                 flags= get_le16(pb);

  408.                 bitrate= get_le32(pb);

  409.                 stream_id= (flags & 0x7f);

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

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

  412.             }

  413.         } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {

  414.             int j;

  415.             int stream_count = get_le16(pb);

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

  417.                 char lang[6];

  418.                 unsigned int lang_len = get_byte(pb);

  419.                 if ((ret = avio_get_str16le(pb, lang_len, lang, sizeof(lang))) < lang_len)

  420.                     url_fskip(pb, lang_len - ret);

  421.                 if (j < 128)

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

  423.             }

  424.         } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {

  425.             int desc_count, i;

  426. 

  427.             desc_count = get_le16(pb);

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

  429.                     int name_len,value_type,value_len;

  430.                     char name[1024];

  431. 

  432.                     name_len = get_le16(pb);

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

  434.                         name_len += 1;

  435.                     if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)

  436.                         url_fskip(pb, name_len - ret);

  437.                     value_type = get_le16(pb);

  438.                     value_len  = get_le16(pb);

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

  440.                         value_len += 1;

  441.                     /**

  442.                      * My sample has that stream set to 0 maybe that mean the container.

  443.                      * Asf stream count start at 1. I am using 0 to the container value since it's unused

  444.                      */

  445.                     if (!strcmp(name, "AspectRatioX")){

  446.                         dar[0].num= get_value(s->pb, value_type);

  447.                     } else if(!strcmp(name, "AspectRatioY")){

  448.                         dar[0].den= get_value(s->pb, value_type);

  449.                     } else

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

  451.             }

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

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

  454.             n = get_le16(pb);

  455. 

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

  457.                 char name[1024];

  458. 

  459.                 get_le16(pb); //lang_list_index

  460.                 stream_num= get_le16(pb);

  461.                 name_len=   get_le16(pb);

  462.                 value_type= get_le16(pb);

  463.                 value_len=  get_le32(pb);

  464. 

  465.                 if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)

  466.                     url_fskip(pb, name_len - ret);

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

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

  469.                 url_fskip(pb, value_len - 2);

  470. 

  471.                 if(stream_num<128){

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

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

  474.                 }

  475.             }

  476.         } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_header)) {

  477.             int ext_len, payload_ext_ct, stream_ct;

  478.             uint32_t ext_d, leak_rate, stream_num;

  479.             unsigned int stream_languageid_index;

  480. 

  481.             get_le64(pb); // starttime

  482.             get_le64(pb); // endtime

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

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

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

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

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

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

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

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

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

  492. 

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

  494.             if (stream_num < 128)

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

  496. 

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

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

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

  500. 

  501.             if (stream_num < 128)

  502.                 bitrate[stream_num] = leak_rate;

  503. 

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

  505.                 get_le16(pb);

  506.                 ext_len = get_le16(pb);

  507.                 url_fseek(pb, ext_len, SEEK_CUR);

  508.             }

  509. 

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

  511.                 ff_get_guid(pb, &g);

  512.                 ext_d=get_le16(pb);

  513.                 ext_len=get_le32(pb);

  514.                 url_fseek(pb, ext_len, SEEK_CUR);

  515.             }

  516. 

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

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

  519.             continue;

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

  521.             int v1, v2;

  522.             ff_get_guid(pb, &g);

  523.             v1 = get_le32(pb);

  524.             v2 = get_le16(pb);

  525.             continue;

  526.         } else if (!ff_guidcmp(&g, &ff_asf_marker_header)) {

  527.             int i, count, name_len;

  528.             char name[1024];

  529. 

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

  531.             get_le64(pb);            // ...

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

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

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

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

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

  537.             }

  538. 

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

  540.                 int64_t pres_time;

  541.                 int name_len;

  542. 

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

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

  545.                 get_le16(pb);             // entry length

  546.                 get_le32(pb);             // send time

  547.                 get_le32(pb);             // flags

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

  549.                 if ((ret = avio_get_str16le(pb, name_len * 2, name, sizeof(name))) < name_len)

  550.                     url_fskip(pb, name_len - ret);

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

  552.             }

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

  554.             return -1;

  555.         } else {

  556.             if (!s->keylen) {

  557.                 if (!ff_guidcmp(&g, &ff_asf_content_encryption)) {

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

  559.                 } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {

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

  561.                 } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {

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

  563.                 }

  564.             }

  565.         }

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

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

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

  569.     }

  570.     ff_get_guid(pb, &g);

  571.     get_le64(pb);

  572.     get_byte(pb);

  573.     get_byte(pb);

  574.     if (url_feof(pb))

  575.         return -1;

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

  577.     asf->packet_size_left = 0;

  578. 

  579. 

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

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

  582.         if(stream_num>=0){

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

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

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

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

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

  588.                           &st->sample_aspect_ratio.den,

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

  590.             } else if ((dar[0].num > 0) && (dar[0].den > 0) && (st->codec->codec_type==AVMEDIA_TYPE_VIDEO)) // Use ASF container value if the stream doesn't AR set.

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

  592.                           &st->sample_aspect_ratio.den,

  593.                           dar[0].num, dar[0].den, INT_MAX);

  594. 

  595. //av_log(s, AV_LOG_INFO, "i=%d, st->codec->codec_type:%d, dar %d:%d sar=%d:%d\n", i, st->codec->codec_type, dar[i].num, dar[i].den, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);

  596. 

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

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

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

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

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

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

  603.                     if (iso6392)

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

  605.                 }

  606.             }

  607.         }

  608.     }

  609. 

  610.     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);

  611. 

  612.     return 0;

  613. }

  614. 

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

  616.     switch (bits & 3) \

  617.     { \

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

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

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

  621.     default: var = defval; break; \

  622.     }

  623. 

  624. /**

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

  626.  * @param s demux context

  627.  * @param pb context to read data from

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

  629.  */

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

  631. {

  632.     ASFContext *asf = s->priv_data;

  633.     uint32_t packet_length, padsize;

  634.     int rsize = 8;

  635.     int c, d, e, off;

  636. 

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

  638.     off= 32768;

  639.     if (s->packet_size > 0)

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

  641. 

  642.     c=d=e=-1;

  643.     while(off-- > 0){

  644.         c=d; d=e;

  645.         e= get_byte(pb);

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

  647.             break;

  648.     }

  649. 

  650.     if (c != 0x82) {

  651.         /**

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

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

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

  655.          * the stream.

  656.          */

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

  658.             return AVERROR(EAGAIN);

  659.         if (!url_feof(pb))

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

  661.     }

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

  663.         if (d || e) {

  664.             if (!url_feof(pb))

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

  666.             return -1;

  667.         }

  668.         c= get_byte(pb);

  669.         d= get_byte(pb);

  670.         rsize+=3;

  671.     }else{

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

  673.     }

  674. 

  675.     asf->packet_flags    = c;

  676.     asf->packet_property = d;

  677. 

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

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

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

  681. 

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

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

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

  685.         return -1;

  686.     }

  687.     if(padsize >= packet_length){

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

  689.         return -1;

  690.     }

  691. 

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

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

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

  695. 

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

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

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

  699.     } else {

  700.         asf->packet_segments = 1;

  701.         asf->packet_segsizetype = 0x80;

  702.     }

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

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

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

  706.     asf->packet_padsize = padsize;

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

  708.     return 0;

  709. }

  710. 

  711. /**

  712.  *

  713.  * @return <0 if error

  714.  */

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

  716.     ASFContext *asf = s->priv_data;

  717.     int rsize = 1;

  718.     int num = get_byte(pb);

  719.     int64_t ts0, ts1;

  720. 

  721.     asf->packet_segments--;

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

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

  724.     // sequence should be ignored!

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

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

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

  728. //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);

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

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

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

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

  733.             return -1;

  734.         }

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

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

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

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

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

  740.             url_fskip(pb, 10);

  741.             ts0= get_le64(pb);

  742.             ts1= get_le64(pb);

  743.             url_fskip(pb, 12);

  744.             get_le32(pb);

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

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

  747.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  748.         }else

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

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

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

  752.         // multipacket - frag_offset is beginning timestamp

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

  754.         asf->packet_frag_offset = 0;

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

  756. 

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

  758.         rsize++;

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

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

  761.         return -1;

  762.     }

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

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

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

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

  767.             return -1;

  768.         }

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

  770.     } else {

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

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

  773.     }

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

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

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

  777.             return -1;

  778.     }

  779.     asf->packet_size_left -= rsize;

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

  781. 

  782.     return 0;

  783. }

  784. 

  785. /**

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

  787.  * with asf_get_packet()).

  788.  * @param s demux context

  789.  * @param pb context to read data from

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

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

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

  793.  */

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

  795. {

  796.     ASFContext *asf = s->priv_data;

  797.     ASFStream *asf_st = 0;

  798.     for (;;) {

  799.         int ret;

  800.         if(url_feof(pb))

  801.             return AVERROR_EOF;

  802.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  807.             assert(ret>=0);

  808.             /* fail safe */

  809.             url_fskip(pb, ret);

  810. 

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

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

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

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

  815.             return 1;

  816.         }

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

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

  819.                 asf->packet_segments= 0;

  820.                 continue;

  821.             }

  822.             if (asf->stream_index < 0

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

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

  825.                 ) {

  826.                 asf->packet_time_start = 0;

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

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

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

  830.                 if(asf->stream_index < 0)

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

  832.                 continue;

  833.             }

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

  835.         }

  836.         asf_st = asf->asf_st;

  837. 

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

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

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

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

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

  843.             asf->packet_size_left--;

  844.             asf->packet_multi_size--;

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

  846.             {

  847.                 asf->packet_time_start = 0;

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

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

  850.                 continue;

  851.             }

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

  853.             //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);

  854.         }

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

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

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

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

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

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

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

  862.         }

  863. 

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

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

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

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

  868.                 asf_st->frag_offset = 0;

  869.                 av_free_packet(&asf_st->pkt);

  870.             }

  871.             /* new packet */

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

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

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

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

  876.             asf_st->pkt.pos =

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

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

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

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

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

  882.                 asf->packet_key_frame = 1;

  883.             if (asf->packet_key_frame)

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

  885.         }

  886. 

  887.         /* read data */

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

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

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

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

  892.         if (asf->packet_size_left < 0)

  893.             continue;

  894. 

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

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

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

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

  899.             continue;

  900.         }

  901. 

  902.         ret = get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,

  903.                          asf->packet_frag_size);

  904.         if (ret != asf->packet_frag_size) {

  905.             if (ret < 0 || asf->packet_frag_offset + ret == 0)

  906.                 return ret < 0 ? ret : AVERROR_EOF;

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

  908.                 // scrambling, we can either drop it completely or fill the remainder

  909.                 // TODO: should we fill the whole packet instead of just the current

  910.                 // fragment?

  911.                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,

  912.                        asf->packet_frag_size - ret);

  913.                 ret = asf->packet_frag_size;

  914.             } else

  915.                 // no scrambling, so we can return partial packets

  916.                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);

  917.         }

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

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

  920.                             ret);

  921.         asf_st->frag_offset += ret;

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

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

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

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

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

  927.                 int i;

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

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

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

  931.                     asf_st->frag_offset = 0;

  932.                     av_free_packet(&asf_st->pkt);

  933.                     continue;

  934.                 }

  935.             }

  936. 

  937.             /* return packet */

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

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

  940.                     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);

  941.               }else{

  942.                 /* packet descrambling */

  943.                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);

  944.                 if (newdata) {

  945.                     int offset = 0;

  946.                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

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

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

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

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

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

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

  953. 

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

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

  956.                         memcpy(newdata + offset,

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

  958.                                asf_st->ds_chunk_size);

  959.                         offset += asf_st->ds_chunk_size;

  960.                     }

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

  962.                     asf_st->pkt.data = newdata;

  963.                 }

  964.               }

  965.             }

  966.             asf_st->frag_offset = 0;

  967.             *pkt= asf_st->pkt;

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

  969.             asf_st->pkt.size = 0;

  970.             asf_st->pkt.data = 0;

  971.             break; // packet completed

  972.         }

  973.     }

  974.     return 0;

  975. }

  976. 

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

  978. {

  979.     ASFContext *asf = s->priv_data;

  980. 

  981.     for (;;) {

  982.         int ret;

  983. 

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

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

  986.             return ret;

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

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

  989.         asf->packet_time_start = 0;

  990.     }

  991. 

  992.     return 0;

  993. }

  994. 

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

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

  997. // leftover information from previous reads

  998. static void asf_reset_header(AVFormatContext *s)

  999. {

  1000.     ASFContext *asf = s->priv_data;

  1001.     ASFStream *asf_st;

  1002.     int i;

  1003. 

  1004.     asf->packet_nb_frames = 0;

  1005.     asf->packet_size_left = 0;

  1006.     asf->packet_segments = 0;

  1007.     asf->packet_flags = 0;

  1008.     asf->packet_property = 0;

  1009.     asf->packet_timestamp = 0;

  1010.     asf->packet_segsizetype = 0;

  1011.     asf->packet_segments = 0;

  1012.     asf->packet_seq = 0;

  1013.     asf->packet_replic_size = 0;

  1014.     asf->packet_key_frame = 0;

  1015.     asf->packet_padsize = 0;

  1016.     asf->packet_frag_offset = 0;

  1017.     asf->packet_frag_size = 0;

  1018.     asf->packet_frag_timestamp = 0;

  1019.     asf->packet_multi_size = 0;

  1020.     asf->packet_obj_size = 0;

  1021.     asf->packet_time_delta = 0;

  1022.     asf->packet_time_start = 0;

  1023. 

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

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

  1026.         av_free_packet(&asf_st->pkt);

  1027.         asf_st->frag_offset=0;

  1028.         asf_st->seq=0;

  1029.     }

  1030.     asf->asf_st= NULL;

  1031. }

  1032. 

  1033. static int asf_read_close(AVFormatContext *s)

  1034. {

  1035.     int i;

  1036. 

  1037.     asf_reset_header(s);

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

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

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

  1041.     }

  1042.     return 0;

  1043. }

  1044. 

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

  1046. {

  1047.     AVPacket pkt1, *pkt = &pkt1;

  1048.     ASFStream *asf_st;

  1049.     int64_t pts;

  1050.     int64_t pos= *ppos;

  1051.     int i;

  1052.     int64_t start_pos[ASF_MAX_STREAMS];

  1053. 

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

  1055.         start_pos[i]= pos;

  1056.     }

  1057. 

  1058.     if (s->packet_size > 0)

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

  1060.     *ppos= pos;

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

  1062. 

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

  1064.     asf_reset_header(s);

  1065.     for(;;){

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

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

  1068.             return AV_NOPTS_VALUE;

  1069.         }

  1070. 

  1071.         pts= pkt->pts;

  1072. 

  1073.         av_free_packet(pkt);

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

  1075.             i= pkt->stream_index;

  1076. 

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

  1078. 

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

  1080.             pos= asf_st->packet_pos;

  1081. 

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

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

  1084. 

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

  1086.                break;

  1087.         }

  1088.     }

  1089. 

  1090.     *ppos= pos;

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

  1092. 

  1093.     return pts;

  1094. }

  1095. 

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

  1097. {

  1098.     ff_asf_guid g;

  1099.     ASFContext *asf = s->priv_data;

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

  1101.     int i;

  1102. 

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

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

  1105. 

  1106.     /* the data object can be followed by other top-level objects,

  1107.        skip them until the simple index object is reached */

  1108.     while (ff_guidcmp(&g, &index_guid)) {

  1109.         int64_t gsize= get_le64(s->pb);

  1110.         if (gsize < 24 || url_feof(s->pb)) {

  1111.             url_fseek(s->pb, current_pos, SEEK_SET);

  1112.             return;

  1113.         }

  1114.         url_fseek(s->pb, gsize-24, SEEK_CUR);

  1115.         ff_get_guid(s->pb, &g);

  1116.     }

  1117. 

  1118.     {

  1119.         int64_t itime, last_pos=-1;

  1120.         int pct, ict;

  1121.         int64_t av_unused gsize= get_le64(s->pb);

  1122.         ff_get_guid(s->pb, &g);

  1123.         itime=get_le64(s->pb);

  1124.         pct=get_le32(s->pb);

  1125.         ict=get_le32(s->pb);

  1126.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1127. 

  1128.         for (i=0;i<ict;i++){

  1129.             int pktnum=get_le32(s->pb);

  1130.             int pktct =get_le16(s->pb);

  1131.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1132.             int64_t index_pts= av_rescale(itime, i, 10000);

  1133. 

  1134.             if(pos != last_pos){

  1135.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);

  1136.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1137.             last_pos=pos;

  1138.             }

  1139.         }

  1140.         asf->index_read= 1;

  1141.     }

  1142.     url_fseek(s->pb, current_pos, SEEK_SET);

  1143. }

  1144. 

  1145. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1146. {

  1147.     ASFContext *asf = s->priv_data;

  1148.     AVStream *st = s->streams[stream_index];

  1149.     int64_t pos;

  1150.     int index;

  1151. 

  1152.     if (s->packet_size <= 0)

  1153.         return -1;

  1154. 

  1155.     /* Try using the protocol's read_seek if available */

  1156.     if(s->pb) {

  1157.         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);

  1158.         if(ret >= 0)

  1159.             asf_reset_header(s);

  1160.         if (ret != AVERROR(ENOSYS))

  1161.             return ret;

  1162.     }

  1163. 

  1164.     if (!asf->index_read)

  1165.         asf_build_simple_index(s, stream_index);

  1166. 

  1167.     if(!(asf->index_read && st->index_entries)){

  1168.         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)

  1169.             return -1;

  1170.     }else{

  1171.         index= av_index_search_timestamp(st, pts, flags);

  1172.         if(index<0)

  1173.             return -1;

  1174. 

  1175.         /* find the position */

  1176.         pos = st->index_entries[index].pos;

  1177. 

  1178.     // various attempts to find key frame have failed so far

  1179.     //    asf_reset_header(s);

  1180.     //    url_fseek(s->pb, pos, SEEK_SET);

  1181.     //    key_pos = pos;

  1182.     //     for(i=0;i<16;i++){

  1183.     //         pos = url_ftell(s->pb);

  1184.     //         if (av_read_frame(s, &pkt) < 0){

  1185.     //             av_log(s, AV_LOG_INFO, "seek failed\n");

  1186.     //             return -1;

  1187.     //         }

  1188.     //         asf_st = s->streams[stream_index]->priv_data;

  1189.     //         pos += st->parser->frame_offset;

  1190.     //

  1191.     //         if (pkt.size > b) {

  1192.     //             b = pkt.size;

  1193.     //             key_pos = pos;

  1194.     //         }

  1195.     //

  1196.     //         av_free_packet(&pkt);

  1197.     //     }

  1198. 

  1199.         /* do the seek */

  1200.         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1201.         url_fseek(s->pb, pos, SEEK_SET);

  1202.     }

  1203.     asf_reset_header(s);

  1204.     return 0;

  1205. }

  1206. 

  1207. AVInputFormat ff_asf_demuxer = {

  1208.     "asf",

  1209.     NULL_IF_CONFIG_SMALL("ASF format"),

  1210.     sizeof(ASFContext),

  1211.     asf_probe,

  1212.     asf_read_header,

  1213.     asf_read_packet,

  1214.     asf_read_close,

  1215.     asf_read_seek,

  1216.     asf_read_pts,

  1217. };