falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
27606 Commits
32 Branches
293MB
Tree: 9087a46d55
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '9087a46d55'
${ noResults }
FFmpeg/libavformat/asfdec.c

1251 lines
47KB
Raw Blame History 

  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. typedef struct {

  36.     int asfid2avid[128];                 ///< conversion table from asf ID 2 AVStream ID

  37.     ASFStream streams[128];              ///< it's max number and it's not that big

  38.     uint32_t stream_bitrates[128];       ///< max number of streams, bitrate for each (for streaming)

  39.     char stream_languages[128][6];       ///< max number of streams, language for each (RFC1766, e.g. en-US)

  40.     /* non streamed additonnal info */

  41.     /* packet filling */

  42.     int packet_size_left;

  43.     /* only for reading */

  44.     uint64_t data_offset;                ///< beginning of the first data packet

  45.     uint64_t data_object_offset;         ///< data object offset (excl. GUID & size)

  46.     uint64_t data_object_size;           ///< size of the data object

  47.     int index_read;

  48. 

  49.     ASFMainHeader hdr;

  50. 

  51.     int packet_flags;

  52.     int packet_property;

  53.     int packet_timestamp;

  54.     int packet_segsizetype;

  55.     int packet_segments;

  56.     int packet_seq;

  57.     int packet_replic_size;

  58.     int packet_key_frame;

  59.     int packet_padsize;

  60.     unsigned int packet_frag_offset;

  61.     unsigned int packet_frag_size;

  62.     int64_t packet_frag_timestamp;

  63.     int packet_multi_size;

  64.     int packet_obj_size;

  65.     int packet_time_delta;

  66.     int packet_time_start;

  67.     int64_t packet_pos;

  68. 

  69.     int stream_index;

  70. 

  71.     ASFStream* asf_st;                   ///< currently decoded stream

  72. } ASFContext;

  73. 

  74. #undef NDEBUG

  75. #include <assert.h>

  76. 

  77. #define ASF_MAX_STREAMS 127

  78. #define FRAME_HEADER_SIZE 17

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

  80. 

  81. static const ff_asf_guid index_guid = {

  82.     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb

  83. };

  84. 

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

  86.     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2

  87. };

  88. /**********************************/

  89. /* decoding */

  90. 

  91. #ifdef DEBUG

  92. #define PRINT_IF_GUID(g,cmp) \

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

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

  95. 

  96. static void print_guid(const ff_asf_guid *g)

  97. {

  98.     int i;

  99.     PRINT_IF_GUID(g, ff_asf_header);

  100.     else PRINT_IF_GUID(g, ff_asf_file_header);

  101.     else PRINT_IF_GUID(g, ff_asf_stream_header);

  102.     else PRINT_IF_GUID(g, ff_asf_audio_stream);

  103.     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);

  104.     else PRINT_IF_GUID(g, ff_asf_video_stream);

  105.     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);

  106.     else PRINT_IF_GUID(g, ff_asf_command_stream);

  107.     else PRINT_IF_GUID(g, ff_asf_comment_header);

  108.     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);

  109.     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);

  110.     else PRINT_IF_GUID(g, ff_asf_data_header);

  111.     else PRINT_IF_GUID(g, index_guid);

  112.     else PRINT_IF_GUID(g, ff_asf_head1_guid);

  113.     else PRINT_IF_GUID(g, ff_asf_head2_guid);

  114.     else PRINT_IF_GUID(g, ff_asf_my_guid);

  115.     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);

  116.     else PRINT_IF_GUID(g, ff_asf_extended_content_header);

  117.     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);

  118.     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);

  119.     else PRINT_IF_GUID(g, ff_asf_metadata_header);

  120.     else PRINT_IF_GUID(g, ff_asf_marker_header);

  121.     else PRINT_IF_GUID(g, stream_bitrate_guid);

  122.     else PRINT_IF_GUID(g, ff_asf_language_guid);

  123.     else

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

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

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

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

  128. }

  129. #undef PRINT_IF_GUID

  130. #else

  131. #define print_guid(g)

  132. #endif

  133. 

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

  135. {

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

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

  138. }

  139. 

  140. static int asf_probe(AVProbeData *pd)

  141. {

  142.     /* check file header */

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

  144.         return AVPROBE_SCORE_MAX;

  145.     else

  146.         return 0;

  147. }

  148. 

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

  150.     switch(type){

  151.         case 2: return get_le32(pb);

  152.         case 3: return get_le32(pb);

  153.         case 4: return get_le64(pb);

  154.         case 5: return get_le16(pb);

  155.         default:return INT_MIN;

  156.     }

  157. }

  158. 

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

  160. {

  161.     char *value;

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

  163. 

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

  165.         return;

  166. 

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

  168.     if (!value)

  169.         goto finish;

  170. 

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

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

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

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

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

  176.     } else {

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

  178.         goto finish;

  179.     }

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

  181. finish:

  182.     av_freep(&value);

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

  184. }

  185. 

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

  187. {

  188.     ASFContext *asf = s->priv_data;

  189.     ff_asf_guid g;

  190.     ByteIOContext *pb = s->pb;

  191.     AVStream *st;

  192.     ASFStream *asf_st;

  193.     int size, i;

  194.     int64_t gsize;

  195.     AVRational dar[128];

  196.     uint32_t bitrate[128];

  197. 

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

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

  200. 

  201.     ff_get_guid(pb, &g);

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

  203.         return -1;

  204.     get_le64(pb);

  205.     get_le32(pb);

  206.     get_byte(pb);

  207.     get_byte(pb);

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

  209.     for(;;) {

  210.         uint64_t gpos= url_ftell(pb);

  211.         int ret;

  212.         ff_get_guid(pb, &g);

  213.         gsize = get_le64(pb);

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

  215.         print_guid(&g);

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

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

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

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

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

  221.                 asf->data_object_size = gsize - 24;

  222.             } else {

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

  224.             }

  225.             break;

  226.         }

  227.         if (gsize < 24)

  228.             return -1;

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

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

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

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

  233.             get_le64(pb);                               /* number of packets */

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

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

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

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

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

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

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

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

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

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

  244.             enum AVMediaType type;

  245.             int type_specific_size, sizeX;

  246.             uint64_t total_size;

  247.             unsigned int tag1;

  248.             int64_t pos1, pos2, start_time;

  249.             int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  250. 

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

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

  253.                 return AVERROR(EINVAL);

  254.             }

  255. 

  256.             pos1 = url_ftell(pb);

  257. 

  258.             st = av_new_stream(s, 0);

  259.             if (!st)

  260.                 return AVERROR(ENOMEM);

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

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

  263.             if (!asf_st)

  264.                 return AVERROR(ENOMEM);

  265.             st->priv_data = asf_st;

  266.             start_time = asf->hdr.preroll;

  267. 

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

  269. 

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

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

  272.                     (10000000 / 1000) - start_time;

  273.             }

  274.             ff_get_guid(pb, &g);

  275. 

  276.             test_for_ext_stream_audio = 0;

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

  278.                 type = AVMEDIA_TYPE_AUDIO;

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

  280.                 type = AVMEDIA_TYPE_VIDEO;

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

  282.                 type = AVMEDIA_TYPE_VIDEO;

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

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

  285.                 type = AVMEDIA_TYPE_DATA;

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

  287.                 test_for_ext_stream_audio = 1;

  288.                 type = AVMEDIA_TYPE_UNKNOWN;

  289.             } else {

  290.                 return -1;

  291.             }

  292.             ff_get_guid(pb, &g);

  293.             total_size = get_le64(pb);

  294.             type_specific_size = get_le32(pb);

  295.             get_le32(pb);

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

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

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

  299. 

  300.             get_le32(pb);

  301. 

  302.             if (test_for_ext_stream_audio) {

  303.                 ff_get_guid(pb, &g);

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

  305.                     type = AVMEDIA_TYPE_AUDIO;

  306.                     is_dvr_ms_audio=1;

  307.                     ff_get_guid(pb, &g);

  308.                     get_le32(pb);

  309.                     get_le32(pb);

  310.                     get_le32(pb);

  311.                     ff_get_guid(pb, &g);

  312.                     get_le32(pb);

  313.                 }

  314.             }

  315. 

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

  317.             if (type == AVMEDIA_TYPE_AUDIO) {

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

  319.                 if (is_dvr_ms_audio) {

  320.                     // codec_id and codec_tag are unreliable in dvr_ms

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

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

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

  324.                 }

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

  326.                     st->need_parsing = AVSTREAM_PARSE_NONE;

  327.                 } else {

  328.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  329.                 }

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

  331.                 pos2 = url_ftell(pb);

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

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

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

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

  336.                     get_le16(pb); //ds_data_size

  337.                     get_byte(pb); //ds_silence_data

  338.                 }

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

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

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

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

  343.                     if (!asf_st->ds_chunk_size

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

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

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

  347.                 }

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

  349.                 case CODEC_ID_MP3:

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

  351.                     break;

  352.                 case CODEC_ID_PCM_S16LE:

  353.                 case CODEC_ID_PCM_S16BE:

  354.                 case CODEC_ID_PCM_U16LE:

  355.                 case CODEC_ID_PCM_U16BE:

  356.                 case CODEC_ID_PCM_S8:

  357.                 case CODEC_ID_PCM_U8:

  358.                 case CODEC_ID_PCM_ALAW:

  359.                 case CODEC_ID_PCM_MULAW:

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

  361.                     break;

  362.                 default:

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

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

  365.                     break;

  366.                 }

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

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

  369.                 get_le32(pb);

  370.                 get_le32(pb);

  371.                 get_byte(pb);

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

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

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

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

  376.                 /* not available for asf */

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

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

  379.                 tag1 = get_le32(pb);

  380.                 url_fskip(pb, 20);

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

  382.                 size= sizeX;

  383.                 if (size > 40) {

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

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

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

  387.                 }

  388. 

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

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

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

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

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

  394. #if HAVE_BIGENDIAN

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

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

  397. #else

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

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

  400. #endif

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

  402.                 }

  403. 

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

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

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

  407.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  408.                     // 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

  409.                     st->codec->width  =

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

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

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

  413.                 }

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

  415.                     st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;

  416.             }

  417.             pos2 = url_ftell(pb);

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

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

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

  421. 

  422.             len1 = get_le16(pb);

  423.             len2 = get_le16(pb);

  424.             len3 = get_le16(pb);

  425.             len4 = get_le16(pb);

  426.             len5 = get_le16(pb);

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

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

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

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

  431.             url_fskip(pb, len5);

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

  433.             int stream_count = get_le16(pb);

  434.             int j;

  435. 

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

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

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

  439.                 int flags, bitrate, stream_id;

  440. 

  441.                 flags= get_le16(pb);

  442.                 bitrate= get_le32(pb);

  443.                 stream_id= (flags & 0x7f);

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

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

  446.             }

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

  448.             int j;

  449.             int stream_count = get_le16(pb);

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

  451.                 char lang[6];

  452.                 unsigned int lang_len = get_byte(pb);

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

  454.                     url_fskip(pb, lang_len - ret);

  455.                 if (j < 128)

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

  457.             }

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

  459.             int desc_count, i;

  460. 

  461.             desc_count = get_le16(pb);

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

  463.                     int name_len,value_type,value_len;

  464.                     char name[1024];

  465. 

  466.                     name_len = get_le16(pb);

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

  468.                         name_len += 1;

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

  470.                         url_fskip(pb, name_len - ret);

  471.                     value_type = get_le16(pb);

  472.                     value_len  = get_le16(pb);

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

  474.                         value_len += 1;

  475.                     /**

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

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

  478.                      */

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

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

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

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

  483.                     } else

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

  485.             }

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

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

  488.             n = get_le16(pb);

  489. 

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

  491.                 char name[1024];

  492. 

  493.                 get_le16(pb); //lang_list_index

  494.                 stream_num= get_le16(pb);

  495.                 name_len=   get_le16(pb);

  496.                 value_type= get_le16(pb);

  497.                 value_len=  get_le32(pb);

  498. 

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

  500.                     url_fskip(pb, name_len - ret);

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

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

  503.                 url_fskip(pb, value_len - 2);

  504. 

  505.                 if(stream_num<128){

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

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

  508.                 }

  509.             }

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

  511.             int ext_len, payload_ext_ct, stream_ct;

  512.             uint32_t ext_d, leak_rate, stream_num;

  513.             unsigned int stream_languageid_index;

  514. 

  515.             get_le64(pb); // starttime

  516.             get_le64(pb); // endtime

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

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

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

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

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

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

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

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

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

  526. 

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

  528.             if (stream_num < 128)

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

  530. 

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

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

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

  534. 

  535.             if (stream_num < 128)

  536.                 bitrate[stream_num] = leak_rate;

  537. 

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

  539.                 get_le16(pb);

  540.                 ext_len = get_le16(pb);

  541.                 url_fseek(pb, ext_len, SEEK_CUR);

  542.             }

  543. 

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

  545.                 ff_get_guid(pb, &g);

  546.                 ext_d=get_le16(pb);

  547.                 ext_len=get_le32(pb);

  548.                 url_fseek(pb, ext_len, SEEK_CUR);

  549.             }

  550. 

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

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

  553.             continue;

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

  555.             int v1, v2;

  556.             ff_get_guid(pb, &g);

  557.             v1 = get_le32(pb);

  558.             v2 = get_le16(pb);

  559.             continue;

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

  561.             int i, count, name_len;

  562.             char name[1024];

  563. 

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

  565.             get_le64(pb);            // ...

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

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

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

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

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

  571.             }

  572. 

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

  574.                 int64_t pres_time;

  575.                 int name_len;

  576. 

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

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

  579.                 get_le16(pb);             // entry length

  580.                 get_le32(pb);             // send time

  581.                 get_le32(pb);             // flags

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

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

  584.                     url_fskip(pb, name_len - ret);

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

  586.             }

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

  588.             return -1;

  589.         } else {

  590.             if (!s->keylen) {

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

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

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

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

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

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

  597.                 }

  598.             }

  599.         }

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

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

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

  603.     }

  604.     ff_get_guid(pb, &g);

  605.     get_le64(pb);

  606.     get_byte(pb);

  607.     get_byte(pb);

  608.     if (url_feof(pb))

  609.         return -1;

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

  611.     asf->packet_size_left = 0;

  612. 

  613. 

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

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

  616.         if(stream_num>=0){

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

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

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

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

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

  622.                           &st->sample_aspect_ratio.den,

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

  624.             } 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.

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

  626.                           &st->sample_aspect_ratio.den,

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

  628. 

  629. //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);

  630. 

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

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

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

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

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

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

  637.                     if (iso6392)

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

  639.                 }

  640.             }

  641.         }

  642.     }

  643. 

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

  645. 

  646.     return 0;

  647. }

  648. 

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

  650.     switch (bits & 3) \

  651.     { \

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

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

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

  655.     default: var = defval; break; \

  656.     }

  657. 

  658. /**

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

  660.  * @param s demux context

  661.  * @param pb context to read data from

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

  663.  */

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

  665. {

  666.     ASFContext *asf = s->priv_data;

  667.     uint32_t packet_length, padsize;

  668.     int rsize = 8;

  669.     int c, d, e, off;

  670. 

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

  672.     off= 32768;

  673.     if (s->packet_size > 0)

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

  675. 

  676.     c=d=e=-1;

  677.     while(off-- > 0){

  678.         c=d; d=e;

  679.         e= get_byte(pb);

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

  681.             break;

  682.     }

  683. 

  684.     if (c != 0x82) {

  685.         /**

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

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

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

  689.          * the stream.

  690.          */

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

  692.             return AVERROR(EAGAIN);

  693.         if (!url_feof(pb))

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

  695.     }

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

  697.         if (d || e) {

  698.             if (!url_feof(pb))

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

  700.             return -1;

  701.         }

  702.         c= get_byte(pb);

  703.         d= get_byte(pb);

  704.         rsize+=3;

  705.     }else{

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

  707.     }

  708. 

  709.     asf->packet_flags    = c;

  710.     asf->packet_property = d;

  711. 

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

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

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

  715. 

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

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

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

  719.         return -1;

  720.     }

  721.     if(padsize >= packet_length){

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

  723.         return -1;

  724.     }

  725. 

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

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

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

  729. 

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

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

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

  733.     } else {

  734.         asf->packet_segments = 1;

  735.         asf->packet_segsizetype = 0x80;

  736.     }

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

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

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

  740.     asf->packet_padsize = padsize;

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

  742.     return 0;

  743. }

  744. 

  745. /**

  746.  *

  747.  * @return <0 if error

  748.  */

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

  750.     ASFContext *asf = s->priv_data;

  751.     int rsize = 1;

  752.     int num = get_byte(pb);

  753.     int64_t ts0, ts1;

  754. 

  755.     asf->packet_segments--;

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

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

  758.     // sequence should be ignored!

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

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

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

  762. //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);

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

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

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

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

  767.             return -1;

  768.         }

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

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

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

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

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

  774.             url_fskip(pb, 10);

  775.             ts0= get_le64(pb);

  776.             ts1= get_le64(pb);

  777.             url_fskip(pb, 12);

  778.             get_le32(pb);

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

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

  781.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  782.         }else

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

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

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

  786.         // multipacket - frag_offset is beginning timestamp

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

  788.         asf->packet_frag_offset = 0;

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

  790. 

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

  792.         rsize++;

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

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

  795.         return -1;

  796.     }

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

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

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

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

  801.             return -1;

  802.         }

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

  804.     } else {

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

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

  807.     }

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

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

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

  811.             return -1;

  812.     }

  813.     asf->packet_size_left -= rsize;

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

  815. 

  816.     return 0;

  817. }

  818. 

  819. /**

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

  821.  * with asf_get_packet()).

  822.  * @param s demux context

  823.  * @param pb context to read data from

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

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

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

  827.  */

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

  829. {

  830.     ASFContext *asf = s->priv_data;

  831.     ASFStream *asf_st = 0;

  832.     for (;;) {

  833.         int ret;

  834.         if(url_feof(pb))

  835.             return AVERROR_EOF;

  836.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  841.             assert(ret>=0);

  842.             /* fail safe */

  843.             url_fskip(pb, ret);

  844. 

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

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

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

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

  849.             return 1;

  850.         }

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

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

  853.                 asf->packet_segments= 0;

  854.                 continue;

  855.             }

  856.             if (asf->stream_index < 0

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

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

  859.                 ) {

  860.                 asf->packet_time_start = 0;

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

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

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

  864.                 if(asf->stream_index < 0)

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

  866.                 continue;

  867.             }

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

  869.         }

  870.         asf_st = asf->asf_st;

  871. 

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

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

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

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

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

  877.             asf->packet_size_left--;

  878.             asf->packet_multi_size--;

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

  880.             {

  881.                 asf->packet_time_start = 0;

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

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

  884.                 continue;

  885.             }

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

  887.             //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);

  888.         }

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

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

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

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

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

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

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

  896.         }

  897. 

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

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

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

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

  902.                 asf_st->frag_offset = 0;

  903.                 av_free_packet(&asf_st->pkt);

  904.             }

  905.             /* new packet */

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

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

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

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

  910.             asf_st->pkt.pos =

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

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

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

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

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

  916.                 asf->packet_key_frame = 1;

  917.             if (asf->packet_key_frame)

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

  919.         }

  920. 

  921.         /* read data */

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

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

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

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

  926.         if (asf->packet_size_left < 0)

  927.             continue;

  928. 

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

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

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

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

  933.             continue;

  934.         }

  935. 

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

  937.                          asf->packet_frag_size);

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

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

  940.                 return ret < 0 ? ret : AVERROR_EOF;

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

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

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

  944.                 // fragment?

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

  946.                        asf->packet_frag_size - ret);

  947.                 ret = asf->packet_frag_size;

  948.             } else

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

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

  951.         }

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

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

  954.                             ret);

  955.         asf_st->frag_offset += ret;

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

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

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

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

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

  961.                 int i;

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

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

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

  965.                     asf_st->frag_offset = 0;

  966.                     av_free_packet(&asf_st->pkt);

  967.                     continue;

  968.                 }

  969.             }

  970. 

  971.             /* return packet */

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

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

  974.                     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);

  975.               }else{

  976.                 /* packet descrambling */

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

  978.                 if (newdata) {

  979.                     int offset = 0;

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

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

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

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

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

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

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

  987. 

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

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

  990.                         memcpy(newdata + offset,

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

  992.                                asf_st->ds_chunk_size);

  993.                         offset += asf_st->ds_chunk_size;

  994.                     }

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

  996.                     asf_st->pkt.data = newdata;

  997.                 }

  998.               }

  999.             }

  1000.             asf_st->frag_offset = 0;

  1001.             *pkt= asf_st->pkt;

  1002.             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);

  1003.             asf_st->pkt.size = 0;

  1004.             asf_st->pkt.data = 0;

  1005.             break; // packet completed

  1006.         }

  1007.     }

  1008.     return 0;

  1009. }

  1010. 

  1011. static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)

  1012. {

  1013.     ASFContext *asf = s->priv_data;

  1014. 

  1015.     for (;;) {

  1016.         int ret;

  1017. 

  1018.         /* parse cached packets, if any */

  1019.         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)

  1020.             return ret;

  1021.         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)

  1022.             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);

  1023.         asf->packet_time_start = 0;

  1024.     }

  1025. 

  1026.     return 0;

  1027. }

  1028. 

  1029. // Added to support seeking after packets have been read

  1030. // If information is not reset, read_packet fails due to

  1031. // leftover information from previous reads

  1032. static void asf_reset_header(AVFormatContext *s)

  1033. {

  1034.     ASFContext *asf = s->priv_data;

  1035.     ASFStream *asf_st;

  1036.     int i;

  1037. 

  1038.     asf->packet_size_left = 0;

  1039.     asf->packet_segments = 0;

  1040.     asf->packet_flags = 0;

  1041.     asf->packet_property = 0;

  1042.     asf->packet_timestamp = 0;

  1043.     asf->packet_segsizetype = 0;

  1044.     asf->packet_segments = 0;

  1045.     asf->packet_seq = 0;

  1046.     asf->packet_replic_size = 0;

  1047.     asf->packet_key_frame = 0;

  1048.     asf->packet_padsize = 0;

  1049.     asf->packet_frag_offset = 0;

  1050.     asf->packet_frag_size = 0;

  1051.     asf->packet_frag_timestamp = 0;

  1052.     asf->packet_multi_size = 0;

  1053.     asf->packet_obj_size = 0;

  1054.     asf->packet_time_delta = 0;

  1055.     asf->packet_time_start = 0;

  1056. 

  1057.     for(i=0; i<s->nb_streams; i++){

  1058.         asf_st= s->streams[i]->priv_data;

  1059.         av_free_packet(&asf_st->pkt);

  1060.         asf_st->frag_offset=0;

  1061.         asf_st->seq=0;

  1062.     }

  1063.     asf->asf_st= NULL;

  1064. }

  1065. 

  1066. static int asf_read_close(AVFormatContext *s)

  1067. {

  1068.     int i;

  1069. 

  1070.     asf_reset_header(s);

  1071.     for(i=0;i<s->nb_streams;i++) {

  1072.         AVStream *st = s->streams[i];

  1073.         av_free(st->codec->palctrl);

  1074.     }

  1075.     return 0;

  1076. }

  1077. 

  1078. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  1079. {

  1080.     AVPacket pkt1, *pkt = &pkt1;

  1081.     ASFStream *asf_st;

  1082.     int64_t pts;

  1083.     int64_t pos= *ppos;

  1084.     int i;

  1085.     int64_t start_pos[ASF_MAX_STREAMS];

  1086. 

  1087.     for(i=0; i<s->nb_streams; i++){

  1088.         start_pos[i]= pos;

  1089.     }

  1090. 

  1091.     if (s->packet_size > 0)

  1092.         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;

  1093.     *ppos= pos;

  1094.     url_fseek(s->pb, pos, SEEK_SET);

  1095. 

  1096. //printf("asf_read_pts\n");

  1097.     asf_reset_header(s);

  1098.     for(;;){

  1099.         if (av_read_frame(s, pkt) < 0){

  1100.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1101.             return AV_NOPTS_VALUE;

  1102.         }

  1103. 

  1104.         pts= pkt->pts;

  1105. 

  1106.         av_free_packet(pkt);

  1107.         if(pkt->flags&AV_PKT_FLAG_KEY){

  1108.             i= pkt->stream_index;

  1109. 

  1110.             asf_st= s->streams[i]->priv_data;

  1111. 

  1112. //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);

  1113.             pos= asf_st->packet_pos;

  1114. 

  1115.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1116.             start_pos[i]= asf_st->packet_pos + 1;

  1117. 

  1118.             if(pkt->stream_index == stream_index)

  1119.                break;

  1120.         }

  1121.     }

  1122. 

  1123.     *ppos= pos;

  1124. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1125. 

  1126.     return pts;

  1127. }

  1128. 

  1129. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1130. {

  1131.     ff_asf_guid g;

  1132.     ASFContext *asf = s->priv_data;

  1133.     int64_t current_pos= url_ftell(s->pb);

  1134.     int i;

  1135. 

  1136.     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);

  1137.     ff_get_guid(s->pb, &g);

  1138. 

  1139.     /* the data object can be followed by other top-level objects,

  1140.        skip them until the simple index object is reached */

  1141.     while (ff_guidcmp(&g, &index_guid)) {

  1142.         int64_t gsize= get_le64(s->pb);

  1143.         if (gsize < 24 || url_feof(s->pb)) {

  1144.             url_fseek(s->pb, current_pos, SEEK_SET);

  1145.             return;

  1146.         }

  1147.         url_fseek(s->pb, gsize-24, SEEK_CUR);

  1148.         ff_get_guid(s->pb, &g);

  1149.     }

  1150. 

  1151.     {

  1152.         int64_t itime, last_pos=-1;

  1153.         int pct, ict;

  1154.         int64_t av_unused gsize= get_le64(s->pb);

  1155.         ff_get_guid(s->pb, &g);

  1156.         itime=get_le64(s->pb);

  1157.         pct=get_le32(s->pb);

  1158.         ict=get_le32(s->pb);

  1159.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1160. 

  1161.         for (i=0;i<ict;i++){

  1162.             int pktnum=get_le32(s->pb);

  1163.             int pktct =get_le16(s->pb);

  1164.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1165.             int64_t index_pts= av_rescale(itime, i, 10000);

  1166. 

  1167.             if(pos != last_pos){

  1168.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);

  1169.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1170.             last_pos=pos;

  1171.             }

  1172.         }

  1173.         asf->index_read= 1;

  1174.     }

  1175.     url_fseek(s->pb, current_pos, SEEK_SET);

  1176. }

  1177. 

  1178. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1179. {

  1180.     ASFContext *asf = s->priv_data;

  1181.     AVStream *st = s->streams[stream_index];

  1182.     int64_t pos;

  1183.     int index;

  1184. 

  1185.     if (s->packet_size <= 0)

  1186.         return -1;

  1187. 

  1188.     /* Try using the protocol's read_seek if available */

  1189.     if(s->pb) {

  1190.         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);

  1191.         if(ret >= 0)

  1192.             asf_reset_header(s);

  1193.         if (ret != AVERROR(ENOSYS))

  1194.             return ret;

  1195.     }

  1196. 

  1197.     if (!asf->index_read)

  1198.         asf_build_simple_index(s, stream_index);

  1199. 

  1200.     if(!(asf->index_read && st->index_entries)){

  1201.         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)

  1202.             return -1;

  1203.     }else{

  1204.         index= av_index_search_timestamp(st, pts, flags);

  1205.         if(index<0)

  1206.             return -1;

  1207. 

  1208.         /* find the position */

  1209.         pos = st->index_entries[index].pos;

  1210. 

  1211.     // various attempts to find key frame have failed so far

  1212.     //    asf_reset_header(s);

  1213.     //    url_fseek(s->pb, pos, SEEK_SET);

  1214.     //    key_pos = pos;

  1215.     //     for(i=0;i<16;i++){

  1216.     //         pos = url_ftell(s->pb);

  1217.     //         if (av_read_frame(s, &pkt) < 0){

  1218.     //             av_log(s, AV_LOG_INFO, "seek failed\n");

  1219.     //             return -1;

  1220.     //         }

  1221.     //         asf_st = s->streams[stream_index]->priv_data;

  1222.     //         pos += st->parser->frame_offset;

  1223.     //

  1224.     //         if (pkt.size > b) {

  1225.     //             b = pkt.size;

  1226.     //             key_pos = pos;

  1227.     //         }

  1228.     //

  1229.     //         av_free_packet(&pkt);

  1230.     //     }

  1231. 

  1232.         /* do the seek */

  1233.         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1234.         url_fseek(s->pb, pos, SEEK_SET);

  1235.     }

  1236.     asf_reset_header(s);

  1237.     return 0;

  1238. }

  1239. 

  1240. AVInputFormat ff_asf_demuxer = {

  1241.     "asf",

  1242.     NULL_IF_CONFIG_SMALL("ASF format"),

  1243.     sizeof(ASFContext),

  1244.     asf_probe,

  1245.     asf_read_header,

  1246.     asf_read_packet,

  1247.     asf_read_close,

  1248.     asf_read_seek,

  1249.     asf_read_pts,

  1250. };