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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. 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.     AVRational dar[128];

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

  41.     /* non streamed additonnal info */

  42.     /* packet filling */

  43.     int packet_size_left;

  44.     /* only for reading */

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

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

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

  48.     int index_read;

  49. 

  50.     ASFMainHeader hdr;

  51. 

  52.     int packet_flags;

  53.     int packet_property;

  54.     int packet_timestamp;

  55.     int packet_segsizetype;

  56.     int packet_segments;

  57.     int packet_seq;

  58.     int packet_replic_size;

  59.     int packet_key_frame;

  60.     int packet_padsize;

  61.     unsigned int packet_frag_offset;

  62.     unsigned int packet_frag_size;

  63.     int64_t packet_frag_timestamp;

  64.     int packet_multi_size;

  65.     int packet_obj_size;

  66.     int packet_time_delta;

  67.     int packet_time_start;

  68.     int64_t packet_pos;

  69. 

  70.     int stream_index;

  71. 

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

  73. } ASFContext;

  74. 

  75. #undef NDEBUG

  76. #include <assert.h>

  77. 

  78. #define ASF_MAX_STREAMS 127

  79. #define FRAME_HEADER_SIZE 17

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

  81. 

  82. static const ff_asf_guid index_guid = {

  83.     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb

  84. };

  85. 

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

  87.     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2

  88. };

  89. /**********************************/

  90. /* decoding */

  91. 

  92. #ifdef DEBUG

  93. #define PRINT_IF_GUID(g,cmp) \

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

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

  96. 

  97. static void print_guid(const ff_asf_guid *g)

  98. {

  99.     int i;

  100.     PRINT_IF_GUID(g, ff_asf_header);

  101.     else PRINT_IF_GUID(g, ff_asf_file_header);

  102.     else PRINT_IF_GUID(g, ff_asf_stream_header);

  103.     else PRINT_IF_GUID(g, ff_asf_audio_stream);

  104.     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);

  105.     else PRINT_IF_GUID(g, ff_asf_video_stream);

  106.     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);

  107.     else PRINT_IF_GUID(g, ff_asf_command_stream);

  108.     else PRINT_IF_GUID(g, ff_asf_comment_header);

  109.     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);

  110.     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);

  111.     else PRINT_IF_GUID(g, ff_asf_data_header);

  112.     else PRINT_IF_GUID(g, index_guid);

  113.     else PRINT_IF_GUID(g, ff_asf_head1_guid);

  114.     else PRINT_IF_GUID(g, ff_asf_head2_guid);

  115.     else PRINT_IF_GUID(g, ff_asf_my_guid);

  116.     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);

  117.     else PRINT_IF_GUID(g, ff_asf_extended_content_header);

  118.     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);

  119.     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);

  120.     else PRINT_IF_GUID(g, ff_asf_metadata_header);

  121.     else PRINT_IF_GUID(g, ff_asf_marker_header);

  122.     else PRINT_IF_GUID(g, stream_bitrate_guid);

  123.     else PRINT_IF_GUID(g, ff_asf_language_guid);

  124.     else

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

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

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

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

  129. }

  130. #undef PRINT_IF_GUID

  131. #else

  132. #define print_guid(g)

  133. #endif

  134. 

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

  136. {

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

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

  139. }

  140. 

  141. static int asf_probe(AVProbeData *pd)

  142. {

  143.     /* check file header */

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

  145.         return AVPROBE_SCORE_MAX;

  146.     else

  147.         return 0;

  148. }

  149. 

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

  151.     switch(type){

  152.         case 2: return get_le32(pb);

  153.         case 3: return get_le32(pb);

  154.         case 4: return get_le64(pb);

  155.         case 5: return get_le16(pb);

  156.         default:return INT_MIN;

  157.     }

  158. }

  159. 

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

  161. {

  162.     char *value;

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

  164. 

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

  166.         return;

  167. 

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

  169.     if (!value)

  170.         goto finish;

  171. 

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

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

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

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

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

  177.     } else {

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

  179.         goto finish;

  180.     }

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

  182. finish:

  183.     av_freep(&value);

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

  185. }

  186. 

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

  188. {

  189.     ASFContext *asf = s->priv_data;

  190.     ff_asf_guid g;

  191.     ByteIOContext *pb = s->pb;

  192.     AVStream *st;

  193.     ASFStream *asf_st;

  194.     int size, i;

  195.     int64_t gsize;

  196.     uint32_t bitrate[128];

  197. 

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

  199. 

  200.     ff_get_guid(pb, &g);

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

  202.         return -1;

  203.     get_le64(pb);

  204.     get_le32(pb);

  205.     get_byte(pb);

  206.     get_byte(pb);

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

  208.     for(;;) {

  209.         uint64_t gpos= url_ftell(pb);

  210.         int ret;

  211.         ff_get_guid(pb, &g);

  212.         gsize = get_le64(pb);

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

  214.         print_guid(&g);

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

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

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

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

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

  220.                 asf->data_object_size = gsize - 24;

  221.             } else {

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

  223.             }

  224.             break;

  225.         }

  226.         if (gsize < 24)

  227.             return -1;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  243.             enum AVMediaType type;

  244.             int type_specific_size, sizeX;

  245.             uint64_t total_size;

  246.             unsigned int tag1;

  247.             int64_t pos1, pos2, start_time;

  248.             int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  249. 

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

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

  252.                 return AVERROR(EINVAL);

  253.             }

  254. 

  255.             pos1 = url_ftell(pb);

  256. 

  257.             st = av_new_stream(s, 0);

  258.             if (!st)

  259.                 return AVERROR(ENOMEM);

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

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

  262.             if (!asf_st)

  263.                 return AVERROR(ENOMEM);

  264.             st->priv_data = asf_st;

  265.             start_time = asf->hdr.preroll;

  266. 

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

  268. 

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

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

  271.                     (10000000 / 1000) - start_time;

  272.             }

  273.             ff_get_guid(pb, &g);

  274. 

  275.             test_for_ext_stream_audio = 0;

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

  277.                 type = AVMEDIA_TYPE_AUDIO;

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

  279.                 type = AVMEDIA_TYPE_VIDEO;

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

  281.                 type = AVMEDIA_TYPE_VIDEO;

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

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

  284.                 type = AVMEDIA_TYPE_DATA;

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

  286.                 test_for_ext_stream_audio = 1;

  287.                 type = AVMEDIA_TYPE_UNKNOWN;

  288.             } else {

  289.                 return -1;

  290.             }

  291.             ff_get_guid(pb, &g);

  292.             total_size = get_le64(pb);

  293.             type_specific_size = get_le32(pb);

  294.             get_le32(pb);

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

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

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

  298. 

  299.             get_le32(pb);

  300. 

  301.             if (test_for_ext_stream_audio) {

  302.                 ff_get_guid(pb, &g);

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

  304.                     type = AVMEDIA_TYPE_AUDIO;

  305.                     is_dvr_ms_audio=1;

  306.                     ff_get_guid(pb, &g);

  307.                     get_le32(pb);

  308.                     get_le32(pb);

  309.                     get_le32(pb);

  310.                     ff_get_guid(pb, &g);

  311.                     get_le32(pb);

  312.                 }

  313.             }

  314. 

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

  316.             if (type == AVMEDIA_TYPE_AUDIO) {

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

  318.                 if (is_dvr_ms_audio) {

  319.                     // codec_id and codec_tag are unreliable in dvr_ms

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

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

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

  323.                 }

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

  325.                     st->need_parsing = AVSTREAM_PARSE_NONE;

  326.                 } else {

  327.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  328.                 }

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

  330.                 pos2 = url_ftell(pb);

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

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

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

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

  335.                     get_le16(pb); //ds_data_size

  336.                     get_byte(pb); //ds_silence_data

  337.                 }

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

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

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

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

  342.                     if (!asf_st->ds_chunk_size

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

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

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

  346.                 }

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

  348.                 case CODEC_ID_MP3:

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

  350.                     break;

  351.                 case CODEC_ID_PCM_S16LE:

  352.                 case CODEC_ID_PCM_S16BE:

  353.                 case CODEC_ID_PCM_U16LE:

  354.                 case CODEC_ID_PCM_U16BE:

  355.                 case CODEC_ID_PCM_S8:

  356.                 case CODEC_ID_PCM_U8:

  357.                 case CODEC_ID_PCM_ALAW:

  358.                 case CODEC_ID_PCM_MULAW:

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

  360.                     break;

  361.                 default:

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

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

  364.                     break;

  365.                 }

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

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

  368.                 get_le32(pb);

  369.                 get_le32(pb);

  370.                 get_byte(pb);

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

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

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

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

  375.                 /* not available for asf */

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

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

  378.                 tag1 = get_le32(pb);

  379.                 url_fskip(pb, 20);

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

  381.                 size= sizeX;

  382.                 if (size > 40) {

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

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

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

  386.                 }

  387. 

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

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

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

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

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

  393. #if HAVE_BIGENDIAN

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

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

  396. #else

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

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

  399. #endif

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

  401.                 }

  402. 

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

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

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

  406.                     st->need_parsing = AVSTREAM_PARSE_FULL;

  407.                     // 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

  408.                     st->codec->width  =

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

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

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

  412.                 }

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

  414.                     st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;

  415.             }

  416.             pos2 = url_ftell(pb);

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

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

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

  420. 

  421.             len1 = get_le16(pb);

  422.             len2 = get_le16(pb);

  423.             len3 = get_le16(pb);

  424.             len4 = get_le16(pb);

  425.             len5 = get_le16(pb);

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

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

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

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

  430.             url_fskip(pb, len5);

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

  432.             int stream_count = get_le16(pb);

  433.             int j;

  434. 

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

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

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

  438.                 int flags, bitrate, stream_id;

  439. 

  440.                 flags= get_le16(pb);

  441.                 bitrate= get_le32(pb);

  442.                 stream_id= (flags & 0x7f);

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

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

  445.             }

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

  447.             int j;

  448.             int stream_count = get_le16(pb);

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

  450.                 char lang[6];

  451.                 unsigned int lang_len = get_byte(pb);

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

  453.                     url_fskip(pb, lang_len - ret);

  454.                 if (j < 128)

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

  456.             }

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

  458.             int desc_count, i;

  459. 

  460.             desc_count = get_le16(pb);

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

  462.                     int name_len,value_type,value_len;

  463.                     char name[1024];

  464. 

  465.                     name_len = get_le16(pb);

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

  467.                         name_len += 1;

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

  469.                         url_fskip(pb, name_len - ret);

  470.                     value_type = get_le16(pb);

  471.                     value_len  = get_le16(pb);

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

  473.                         value_len += 1;

  474.                     /**

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

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

  477.                      */

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

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

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

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

  482.                     } else

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

  484.             }

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

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

  487.             n = get_le16(pb);

  488. 

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

  490.                 char name[1024];

  491. 

  492.                 get_le16(pb); //lang_list_index

  493.                 stream_num= get_le16(pb);

  494.                 name_len=   get_le16(pb);

  495.                 value_type= get_le16(pb);

  496.                 value_len=  get_le32(pb);

  497. 

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

  499.                     url_fskip(pb, name_len - ret);

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

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

  502.                 url_fskip(pb, value_len - 2);

  503. 

  504.                 if(stream_num<128){

  505.                     if     (!strcmp(name, "AspectRatioX")) asf->dar[stream_num].num= value_num;

  506.                     else if(!strcmp(name, "AspectRatioY")) asf->dar[stream_num].den= value_num;

  507.                 }

  508.             }

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

  510.             int ext_len, payload_ext_ct, stream_ct;

  511.             uint32_t ext_d, leak_rate, stream_num;

  512.             unsigned int stream_languageid_index;

  513. 

  514.             get_le64(pb); // starttime

  515.             get_le64(pb); // endtime

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

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

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

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

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

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

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

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

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

  525. 

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

  527.             if (stream_num < 128)

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

  529. 

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

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

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

  533. 

  534.             if (stream_num < 128)

  535.                 bitrate[stream_num] = leak_rate;

  536. 

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

  538.                 get_le16(pb);

  539.                 ext_len = get_le16(pb);

  540.                 url_fseek(pb, ext_len, SEEK_CUR);

  541.             }

  542. 

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

  544.                 ff_get_guid(pb, &g);

  545.                 ext_d=get_le16(pb);

  546.                 ext_len=get_le32(pb);

  547.                 url_fseek(pb, ext_len, SEEK_CUR);

  548.             }

  549. 

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

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

  552.             continue;

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

  554.             int v1, v2;

  555.             ff_get_guid(pb, &g);

  556.             v1 = get_le32(pb);

  557.             v2 = get_le16(pb);

  558.             continue;

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

  560.             int i, count, name_len;

  561.             char name[1024];

  562. 

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

  564.             get_le64(pb);            // ...

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

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

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

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

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

  570.             }

  571. 

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

  573.                 int64_t pres_time;

  574.                 int name_len;

  575. 

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

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

  578.                 get_le16(pb);             // entry length

  579.                 get_le32(pb);             // send time

  580.                 get_le32(pb);             // flags

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

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

  583.                     url_fskip(pb, name_len - ret);

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

  585.             }

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

  587.             return -1;

  588.         } else {

  589.             if (!s->keylen) {

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

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

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

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

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

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

  596.                 }

  597.             }

  598.         }

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

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

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

  602.     }

  603.     ff_get_guid(pb, &g);

  604.     get_le64(pb);

  605.     get_byte(pb);

  606.     get_byte(pb);

  607.     if (url_feof(pb))

  608.         return -1;

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

  610.     asf->packet_size_left = 0;

  611. 

  612. 

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

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

  615.         if(stream_num>=0){

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

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

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

  619.             if (asf->dar[i].num > 0 && asf->dar[i].den > 0){

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

  621.                           &st->sample_aspect_ratio.den,

  622.                           asf->dar[i].num, asf->dar[i].den, INT_MAX);

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

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

  625.                           &st->sample_aspect_ratio.den,

  626.                           asf->dar[0].num, asf->dar[0].den, INT_MAX);

  627. 

  628. //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);

  629. 

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

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

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

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

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

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

  636.                     if (iso6392)

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

  638.                 }

  639.             }

  640.         }

  641.     }

  642. 

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

  644. 

  645.     return 0;

  646. }

  647. 

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

  649.     switch (bits & 3) \

  650.     { \

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

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

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

  654.     default: var = defval; break; \

  655.     }

  656. 

  657. /**

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

  659.  * @param s demux context

  660.  * @param pb context to read data from

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

  662.  */

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

  664. {

  665.     ASFContext *asf = s->priv_data;

  666.     uint32_t packet_length, padsize;

  667.     int rsize = 8;

  668.     int c, d, e, off;

  669. 

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

  671.     off= 32768;

  672.     if (s->packet_size > 0)

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

  674. 

  675.     c=d=e=-1;

  676.     while(off-- > 0){

  677.         c=d; d=e;

  678.         e= get_byte(pb);

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

  680.             break;

  681.     }

  682. 

  683.     if (c != 0x82) {

  684.         /**

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

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

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

  688.          * the stream.

  689.          */

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

  691.             return AVERROR(EAGAIN);

  692.         if (!url_feof(pb))

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

  694.     }

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

  696.         if (d || e) {

  697.             if (!url_feof(pb))

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

  699.             return -1;

  700.         }

  701.         c= get_byte(pb);

  702.         d= get_byte(pb);

  703.         rsize+=3;

  704.     }else{

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

  706.     }

  707. 

  708.     asf->packet_flags    = c;

  709.     asf->packet_property = d;

  710. 

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

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

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

  714. 

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

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

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

  718.         return -1;

  719.     }

  720.     if(padsize >= packet_length){

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

  722.         return -1;

  723.     }

  724. 

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

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

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

  728. 

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

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

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

  732.     } else {

  733.         asf->packet_segments = 1;

  734.         asf->packet_segsizetype = 0x80;

  735.     }

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

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

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

  739.     asf->packet_padsize = padsize;

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

  741.     return 0;

  742. }

  743. 

  744. /**

  745.  *

  746.  * @return <0 if error

  747.  */

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

  749.     ASFContext *asf = s->priv_data;

  750.     int rsize = 1;

  751.     int num = get_byte(pb);

  752.     int64_t ts0, ts1;

  753. 

  754.     asf->packet_segments--;

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

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

  757.     // sequence should be ignored!

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

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

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

  761. //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);

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

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

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

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

  766.             return -1;

  767.         }

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

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

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

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

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

  773.             url_fskip(pb, 10);

  774.             ts0= get_le64(pb);

  775.             ts1= get_le64(pb);

  776.             url_fskip(pb, 12);

  777.             get_le32(pb);

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

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

  780.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  781.         }else

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

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

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

  785.         // multipacket - frag_offset is beginning timestamp

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

  787.         asf->packet_frag_offset = 0;

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

  789. 

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

  791.         rsize++;

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

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

  794.         return -1;

  795.     }

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

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

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

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

  800.             return -1;

  801.         }

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

  803.     } else {

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

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

  806.     }

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

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

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

  810.             return -1;

  811.     }

  812.     asf->packet_size_left -= rsize;

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

  814. 

  815.     return 0;

  816. }

  817. 

  818. /**

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

  820.  * with asf_get_packet()).

  821.  * @param s demux context

  822.  * @param pb context to read data from

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

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

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

  826.  */

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

  828. {

  829.     ASFContext *asf = s->priv_data;

  830.     ASFStream *asf_st = 0;

  831.     for (;;) {

  832.         int ret;

  833.         if(url_feof(pb))

  834.             return AVERROR_EOF;

  835.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  840.             assert(ret>=0);

  841.             /* fail safe */

  842.             url_fskip(pb, ret);

  843. 

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

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

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

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

  848.             return 1;

  849.         }

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

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

  852.                 asf->packet_segments= 0;

  853.                 continue;

  854.             }

  855.             if (asf->stream_index < 0

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

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

  858.                 ) {

  859.                 asf->packet_time_start = 0;

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

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

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

  863.                 if(asf->stream_index < 0)

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

  865.                 continue;

  866.             }

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

  868.         }

  869.         asf_st = asf->asf_st;

  870. 

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

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

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

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

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

  876.             asf->packet_size_left--;

  877.             asf->packet_multi_size--;

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

  879.             {

  880.                 asf->packet_time_start = 0;

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

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

  883.                 continue;

  884.             }

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

  886.             //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);

  887.         }

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

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

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

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

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

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

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

  895.         }

  896. 

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

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

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

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

  901.                 asf_st->frag_offset = 0;

  902.                 av_free_packet(&asf_st->pkt);

  903.             }

  904.             /* new packet */

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

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

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

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

  909.             asf_st->pkt.pos =

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

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

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

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

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

  915.                 asf->packet_key_frame = 1;

  916.             if (asf->packet_key_frame)

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

  918.         }

  919. 

  920.         /* read data */

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

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

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

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

  925.         if (asf->packet_size_left < 0)

  926.             continue;

  927. 

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

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

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

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

  932.             continue;

  933.         }

  934. 

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

  936.                          asf->packet_frag_size);

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

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

  939.                 return ret < 0 ? ret : AVERROR_EOF;

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

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

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

  943.                 // fragment?

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

  945.                        asf->packet_frag_size - ret);

  946.                 ret = asf->packet_frag_size;

  947.             } else

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

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

  950.         }

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

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

  953.                             ret);

  954.         asf_st->frag_offset += ret;

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

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

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

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

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

  960.                 int i;

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

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

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

  964.                     asf_st->frag_offset = 0;

  965.                     av_free_packet(&asf_st->pkt);

  966.                     continue;

  967.                 }

  968.             }

  969. 

  970.             /* return packet */

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

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

  973.                     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);

  974.               }else{

  975.                 /* packet descrambling */

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

  977.                 if (newdata) {

  978.                     int offset = 0;

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

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

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

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

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

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

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

  986. 

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

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

  989.                         memcpy(newdata + offset,

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

  991.                                asf_st->ds_chunk_size);

  992.                         offset += asf_st->ds_chunk_size;

  993.                     }

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

  995.                     asf_st->pkt.data = newdata;

  996.                 }

  997.               }

  998.             }

  999.             asf_st->frag_offset = 0;

  1000.             *pkt= asf_st->pkt;

  1001.             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);

  1002.             asf_st->pkt.size = 0;

  1003.             asf_st->pkt.data = 0;

  1004.             break; // packet completed

  1005.         }

  1006.     }

  1007.     return 0;

  1008. }

  1009. 

  1010. static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)

  1011. {

  1012.     ASFContext *asf = s->priv_data;

  1013. 

  1014.     for (;;) {

  1015.         int ret;

  1016. 

  1017.         /* parse cached packets, if any */

  1018.         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)

  1019.             return ret;

  1020.         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)

  1021.             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);

  1022.         asf->packet_time_start = 0;

  1023.     }

  1024. 

  1025.     return 0;

  1026. }

  1027. 

  1028. // Added to support seeking after packets have been read

  1029. // If information is not reset, read_packet fails due to

  1030. // leftover information from previous reads

  1031. static void asf_reset_header(AVFormatContext *s)

  1032. {

  1033.     ASFContext *asf = s->priv_data;

  1034.     ASFStream *asf_st;

  1035.     int i;

  1036. 

  1037.     asf->packet_size_left = 0;

  1038.     asf->packet_segments = 0;

  1039.     asf->packet_flags = 0;

  1040.     asf->packet_property = 0;

  1041.     asf->packet_timestamp = 0;

  1042.     asf->packet_segsizetype = 0;

  1043.     asf->packet_segments = 0;

  1044.     asf->packet_seq = 0;

  1045.     asf->packet_replic_size = 0;

  1046.     asf->packet_key_frame = 0;

  1047.     asf->packet_padsize = 0;

  1048.     asf->packet_frag_offset = 0;

  1049.     asf->packet_frag_size = 0;

  1050.     asf->packet_frag_timestamp = 0;

  1051.     asf->packet_multi_size = 0;

  1052.     asf->packet_obj_size = 0;

  1053.     asf->packet_time_delta = 0;

  1054.     asf->packet_time_start = 0;

  1055. 

  1056.     for(i=0; i<s->nb_streams; i++){

  1057.         asf_st= s->streams[i]->priv_data;

  1058.         av_free_packet(&asf_st->pkt);

  1059.         asf_st->frag_offset=0;

  1060.         asf_st->seq=0;

  1061.     }

  1062.     asf->asf_st= NULL;

  1063. }

  1064. 

  1065. static int asf_read_close(AVFormatContext *s)

  1066. {

  1067.     int i;

  1068. 

  1069.     asf_reset_header(s);

  1070.     for(i=0;i<s->nb_streams;i++) {

  1071.         AVStream *st = s->streams[i];

  1072.         av_free(st->codec->palctrl);

  1073.     }

  1074.     return 0;

  1075. }

  1076. 

  1077. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  1078. {

  1079.     AVPacket pkt1, *pkt = &pkt1;

  1080.     ASFStream *asf_st;

  1081.     int64_t pts;

  1082.     int64_t pos= *ppos;

  1083.     int i;

  1084.     int64_t start_pos[ASF_MAX_STREAMS];

  1085. 

  1086.     for(i=0; i<s->nb_streams; i++){

  1087.         start_pos[i]= pos;

  1088.     }

  1089. 

  1090.     if (s->packet_size > 0)

  1091.         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;

  1092.     *ppos= pos;

  1093.     url_fseek(s->pb, pos, SEEK_SET);

  1094. 

  1095. //printf("asf_read_pts\n");

  1096.     asf_reset_header(s);

  1097.     for(;;){

  1098.         if (av_read_frame(s, pkt) < 0){

  1099.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1100.             return AV_NOPTS_VALUE;

  1101.         }

  1102. 

  1103.         pts= pkt->pts;

  1104. 

  1105.         av_free_packet(pkt);

  1106.         if(pkt->flags&AV_PKT_FLAG_KEY){

  1107.             i= pkt->stream_index;

  1108. 

  1109.             asf_st= s->streams[i]->priv_data;

  1110. 

  1111. //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);

  1112.             pos= asf_st->packet_pos;

  1113. 

  1114.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1115.             start_pos[i]= asf_st->packet_pos + 1;

  1116. 

  1117.             if(pkt->stream_index == stream_index)

  1118.                break;

  1119.         }

  1120.     }

  1121. 

  1122.     *ppos= pos;

  1123. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1124. 

  1125.     return pts;

  1126. }

  1127. 

  1128. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1129. {

  1130.     ff_asf_guid g;

  1131.     ASFContext *asf = s->priv_data;

  1132.     int64_t current_pos= url_ftell(s->pb);

  1133.     int i;

  1134. 

  1135.     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);

  1136.     ff_get_guid(s->pb, &g);

  1137. 

  1138.     /* the data object can be followed by other top-level objects,

  1139.        skip them until the simple index object is reached */

  1140.     while (ff_guidcmp(&g, &index_guid)) {

  1141.         int64_t gsize= get_le64(s->pb);

  1142.         if (gsize < 24 || url_feof(s->pb)) {

  1143.             url_fseek(s->pb, current_pos, SEEK_SET);

  1144.             return;

  1145.         }

  1146.         url_fseek(s->pb, gsize-24, SEEK_CUR);

  1147.         ff_get_guid(s->pb, &g);

  1148.     }

  1149. 

  1150.     {

  1151.         int64_t itime, last_pos=-1;

  1152.         int pct, ict;

  1153.         int64_t av_unused gsize= get_le64(s->pb);

  1154.         ff_get_guid(s->pb, &g);

  1155.         itime=get_le64(s->pb);

  1156.         pct=get_le32(s->pb);

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

  1158.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1159. 

  1160.         for (i=0;i<ict;i++){

  1161.             int pktnum=get_le32(s->pb);

  1162.             int pktct =get_le16(s->pb);

  1163.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1164.             int64_t index_pts= av_rescale(itime, i, 10000);

  1165. 

  1166.             if(pos != last_pos){

  1167.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);

  1168.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1169.             last_pos=pos;

  1170.             }

  1171.         }

  1172.         asf->index_read= 1;

  1173.     }

  1174.     url_fseek(s->pb, current_pos, SEEK_SET);

  1175. }

  1176. 

  1177. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1178. {

  1179.     ASFContext *asf = s->priv_data;

  1180.     AVStream *st = s->streams[stream_index];

  1181.     int64_t pos;

  1182.     int index;

  1183. 

  1184.     if (s->packet_size <= 0)

  1185.         return -1;

  1186. 

  1187.     /* Try using the protocol's read_seek if available */

  1188.     if(s->pb) {

  1189.         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);

  1190.         if(ret >= 0)

  1191.             asf_reset_header(s);

  1192.         if (ret != AVERROR(ENOSYS))

  1193.             return ret;

  1194.     }

  1195. 

  1196.     if (!asf->index_read)

  1197.         asf_build_simple_index(s, stream_index);

  1198. 

  1199.     if(!(asf->index_read && st->index_entries)){

  1200.         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)

  1201.             return -1;

  1202.     }else{

  1203.         index= av_index_search_timestamp(st, pts, flags);

  1204.         if(index<0)

  1205.             return -1;

  1206. 

  1207.         /* find the position */

  1208.         pos = st->index_entries[index].pos;

  1209. 

  1210.     // various attempts to find key frame have failed so far

  1211.     //    asf_reset_header(s);

  1212.     //    url_fseek(s->pb, pos, SEEK_SET);

  1213.     //    key_pos = pos;

  1214.     //     for(i=0;i<16;i++){

  1215.     //         pos = url_ftell(s->pb);

  1216.     //         if (av_read_frame(s, &pkt) < 0){

  1217.     //             av_log(s, AV_LOG_INFO, "seek failed\n");

  1218.     //             return -1;

  1219.     //         }

  1220.     //         asf_st = s->streams[stream_index]->priv_data;

  1221.     //         pos += st->parser->frame_offset;

  1222.     //

  1223.     //         if (pkt.size > b) {

  1224.     //             b = pkt.size;

  1225.     //             key_pos = pos;

  1226.     //         }

  1227.     //

  1228.     //         av_free_packet(&pkt);

  1229.     //     }

  1230. 

  1231.         /* do the seek */

  1232.         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1233.         url_fseek(s->pb, pos, SEEK_SET);

  1234.     }

  1235.     asf_reset_header(s);

  1236.     return 0;

  1237. }

  1238. 

  1239. AVInputFormat ff_asf_demuxer = {

  1240.     "asf",

  1241.     NULL_IF_CONFIG_SMALL("ASF format"),

  1242.     sizeof(ASFContext),

  1243.     asf_probe,

  1244.     asf_read_header,

  1245.     asf_read_packet,

  1246.     asf_read_close,

  1247.     asf_read_seek,

  1248.     asf_read_pts,

  1249. };