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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 Libav.

  6.  *

  7.  * Libav 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.  * Libav 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 Libav; 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 "avio_internal.h"

  29. #include "riff.h"

  30. #include "asf.h"

  31. #include "asfcrypt.h"

  32. #include "avlanguage.h"

  33. 

  34. typedef struct {

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

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

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

  38.     AVRational dar[128];

  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(AVIOContext *s, ff_asf_guid *g)

  135. {

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

  137.     avio_read(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(AVIOContext *pb, int type){

  150.     switch(type){

  151.         case 2: return avio_rl32(pb);

  152.         case 3: return avio_rl32(pb);

  153.         case 4: return avio_rl64(pb);

  154.         case 5: return avio_rl16(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 = avio_tell(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.     if (*value)

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

  182. finish:

  183.     av_freep(&value);

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

  185. }

  186. 

  187. static int asf_read_file_properties(AVFormatContext *s, int64_t size)

  188. {

  189.     ASFContext *asf = s->priv_data;

  190.     AVIOContext *pb = s->pb;

  191. 

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

  193.     asf->hdr.file_size          = avio_rl64(pb);

  194.     asf->hdr.create_time        = avio_rl64(pb);

  195.     avio_rl64(pb);                               /* number of packets */

  196.     asf->hdr.play_time          = avio_rl64(pb);

  197.     asf->hdr.send_time          = avio_rl64(pb);

  198.     asf->hdr.preroll            = avio_rl32(pb);

  199.     asf->hdr.ignore             = avio_rl32(pb);

  200.     asf->hdr.flags              = avio_rl32(pb);

  201.     asf->hdr.min_pktsize        = avio_rl32(pb);

  202.     asf->hdr.max_pktsize        = avio_rl32(pb);

  203.     asf->hdr.max_bitrate        = avio_rl32(pb);

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

  205. 

  206.     return 0;

  207. }

  208. 

  209. static int asf_read_stream_properties(AVFormatContext *s, int64_t size)

  210. {

  211.     ASFContext *asf = s->priv_data;

  212.     AVIOContext *pb = s->pb;

  213.     AVStream *st;

  214.     ASFStream *asf_st;

  215.     ff_asf_guid g;

  216.     enum AVMediaType type;

  217.     int type_specific_size, sizeX;

  218.     uint64_t total_size;

  219.     unsigned int tag1;

  220.     int64_t pos1, pos2, start_time;

  221.     int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  222. 

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

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

  225.         return AVERROR(EINVAL);

  226.     }

  227. 

  228.     pos1 = avio_tell(pb);

  229. 

  230.     st = av_new_stream(s, 0);

  231.     if (!st)

  232.         return AVERROR(ENOMEM);

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

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

  235.     if (!asf_st)

  236.         return AVERROR(ENOMEM);

  237.     st->priv_data = asf_st;

  238.     st->start_time = 0;

  239.     start_time = asf->hdr.preroll;

  240. 

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

  242. 

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

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

  245.             (10000000 / 1000) - start_time;

  246.     }

  247.     ff_get_guid(pb, &g);

  248. 

  249.     test_for_ext_stream_audio = 0;

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

  251.         type = AVMEDIA_TYPE_AUDIO;

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

  253.         type = AVMEDIA_TYPE_VIDEO;

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

  255.         type = AVMEDIA_TYPE_VIDEO;

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

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

  258.         type = AVMEDIA_TYPE_DATA;

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

  260.         test_for_ext_stream_audio = 1;

  261.         type = AVMEDIA_TYPE_UNKNOWN;

  262.     } else {

  263.         return -1;

  264.     }

  265.     ff_get_guid(pb, &g);

  266.     total_size = avio_rl64(pb);

  267.     type_specific_size = avio_rl32(pb);

  268.     avio_rl32(pb);

  269.     st->id = avio_rl16(pb) & 0x7f; /* stream id */

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

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

  272. 

  273.     avio_rl32(pb);

  274. 

  275.     if (test_for_ext_stream_audio) {

  276.         ff_get_guid(pb, &g);

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

  278.             type = AVMEDIA_TYPE_AUDIO;

  279.             is_dvr_ms_audio=1;

  280.             ff_get_guid(pb, &g);

  281.             avio_rl32(pb);

  282.             avio_rl32(pb);

  283.             avio_rl32(pb);

  284.             ff_get_guid(pb, &g);

  285.             avio_rl32(pb);

  286.         }

  287.     }

  288. 

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

  290.     if (type == AVMEDIA_TYPE_AUDIO) {

  291.         int ret = ff_get_wav_header(pb, st->codec, type_specific_size);

  292.         if (ret < 0)

  293.             return ret;

  294.         if (is_dvr_ms_audio) {

  295.             // codec_id and codec_tag are unreliable in dvr_ms

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

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

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

  299.         }

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

  301.             st->need_parsing = AVSTREAM_PARSE_NONE;

  302.         } else {

  303.             st->need_parsing = AVSTREAM_PARSE_FULL;

  304.         }

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

  306.         pos2 = avio_tell(pb);

  307.         if (size >= (pos2 + 8 - pos1 + 24)) {

  308.             asf_st->ds_span = avio_r8(pb);

  309.             asf_st->ds_packet_size = avio_rl16(pb);

  310.             asf_st->ds_chunk_size = avio_rl16(pb);

  311.             avio_rl16(pb); //ds_data_size

  312.             avio_r8(pb);   //ds_silence_data

  313.         }

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

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

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

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

  318.             if (!asf_st->ds_chunk_size

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

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

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

  322.         }

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

  324.             case CODEC_ID_MP3:

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

  326.                 break;

  327.             case CODEC_ID_PCM_S16LE:

  328.             case CODEC_ID_PCM_S16BE:

  329.             case CODEC_ID_PCM_U16LE:

  330.             case CODEC_ID_PCM_U16BE:

  331.             case CODEC_ID_PCM_S8:

  332.             case CODEC_ID_PCM_U8:

  333.             case CODEC_ID_PCM_ALAW:

  334.             case CODEC_ID_PCM_MULAW:

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

  336.                 break;

  337.             default:

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

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

  340.                 break;

  341.         }

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

  343.             size - (avio_tell(pb) - pos1 + 24) >= 51) {

  344.         avio_rl32(pb);

  345.         avio_rl32(pb);

  346.         avio_r8(pb);

  347.         avio_rl16(pb);        /* size */

  348.         sizeX= avio_rl32(pb); /* size */

  349.         st->codec->width = avio_rl32(pb);

  350.         st->codec->height = avio_rl32(pb);

  351.         /* not available for asf */

  352.         avio_rl16(pb); /* panes */

  353.         st->codec->bits_per_coded_sample = avio_rl16(pb); /* depth */

  354.         tag1 = avio_rl32(pb);

  355.         avio_skip(pb, 20);

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

  357.         if (sizeX > 40) {

  358.             st->codec->extradata_size = sizeX - 40;

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

  360.             avio_read(pb, st->codec->extradata, st->codec->extradata_size);

  361.         }

  362. 

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

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

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

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

  367.             int av_unused i;

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

  369. #if HAVE_BIGENDIAN

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

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

  372. #else

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

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

  375. #endif

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

  377.         }

  378. 

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

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

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

  382.             st->need_parsing = AVSTREAM_PARSE_FULL;

  383.             // 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

  384.             st->codec->width  =

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

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

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

  388.         }

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

  390.             st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;

  391.     }

  392.     pos2 = avio_tell(pb);

  393.     avio_skip(pb, size - (pos2 - pos1 + 24));

  394. 

  395.     return 0;

  396. }

  397. 

  398. static int asf_read_ext_stream_properties(AVFormatContext *s, int64_t size)

  399. {

  400.     ASFContext *asf = s->priv_data;

  401.     AVIOContext *pb = s->pb;

  402.     ff_asf_guid g;

  403.     int ext_len, payload_ext_ct, stream_ct, i;

  404.     uint32_t ext_d, leak_rate, stream_num;

  405.     unsigned int stream_languageid_index;

  406. 

  407.     avio_rl64(pb); // starttime

  408.     avio_rl64(pb); // endtime

  409.     leak_rate = avio_rl32(pb); // leak-datarate

  410.     avio_rl32(pb); // bucket-datasize

  411.     avio_rl32(pb); // init-bucket-fullness

  412.     avio_rl32(pb); // alt-leak-datarate

  413.     avio_rl32(pb); // alt-bucket-datasize

  414.     avio_rl32(pb); // alt-init-bucket-fullness

  415.     avio_rl32(pb); // max-object-size

  416.     avio_rl32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)

  417.     stream_num = avio_rl16(pb); // stream-num

  418. 

  419.     stream_languageid_index = avio_rl16(pb); // stream-language-id-index

  420.     if (stream_num < 128)

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

  422. 

  423.     avio_rl64(pb); // avg frametime in 100ns units

  424.     stream_ct = avio_rl16(pb); //stream-name-count

  425.     payload_ext_ct = avio_rl16(pb); //payload-extension-system-count

  426. 

  427.     if (stream_num < 128)

  428.         asf->stream_bitrates[stream_num] = leak_rate;

  429. 

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

  431.         avio_rl16(pb);

  432.         ext_len = avio_rl16(pb);

  433.         avio_skip(pb, ext_len);

  434.     }

  435. 

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

  437.         ff_get_guid(pb, &g);

  438.         ext_d=avio_rl16(pb);

  439.         ext_len=avio_rl32(pb);

  440.         avio_skip(pb, ext_len);

  441.     }

  442. 

  443.     return 0;

  444. }

  445. 

  446. static int asf_read_content_desc(AVFormatContext *s, int64_t size)

  447. {

  448.     AVIOContext *pb = s->pb;

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

  450. 

  451.     len1 = avio_rl16(pb);

  452.     len2 = avio_rl16(pb);

  453.     len3 = avio_rl16(pb);

  454.     len4 = avio_rl16(pb);

  455.     len5 = avio_rl16(pb);

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

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

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

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

  460.     avio_skip(pb, len5);

  461. 

  462.     return 0;

  463. }

  464. 

  465. static int asf_read_ext_content_desc(AVFormatContext *s, int64_t size)

  466. {

  467.     AVIOContext *pb = s->pb;

  468.     ASFContext *asf = s->priv_data;

  469.     int desc_count, i, ret;

  470. 

  471.     desc_count = avio_rl16(pb);

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

  473.         int name_len,value_type,value_len;

  474.         char name[1024];

  475. 

  476.         name_len = avio_rl16(pb);

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

  478.             name_len += 1;

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

  480.             avio_skip(pb, name_len - ret);

  481.         value_type = avio_rl16(pb);

  482.         value_len  = avio_rl16(pb);

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

  484.             value_len += 1;

  485.         /**

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

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

  488.          */

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

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

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

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

  493.         } else

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

  495.     }

  496. 

  497.     return 0;

  498. }

  499. 

  500. static int asf_read_language_list(AVFormatContext *s, int64_t size)

  501. {

  502.     AVIOContext *pb = s->pb;

  503.     ASFContext *asf = s->priv_data;

  504.     int j, ret;

  505.     int stream_count = avio_rl16(pb);

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

  507.         char lang[6];

  508.         unsigned int lang_len = avio_r8(pb);

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

  510.             avio_skip(pb, lang_len - ret);

  511.         if (j < 128)

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

  513.     }

  514. 

  515.     return 0;

  516. }

  517. 

  518. static int asf_read_metadata(AVFormatContext *s, int64_t size)

  519. {

  520.     AVIOContext *pb = s->pb;

  521.     ASFContext *asf = s->priv_data;

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

  523.     int ret, i;

  524.     n = avio_rl16(pb);

  525. 

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

  527.         char name[1024];

  528. 

  529.         avio_rl16(pb); //lang_list_index

  530.         stream_num= avio_rl16(pb);

  531.         name_len=   avio_rl16(pb);

  532.         value_type= avio_rl16(pb);

  533.         value_len=  avio_rl32(pb);

  534. 

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

  536.             avio_skip(pb, name_len - ret);

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

  538.         value_num= avio_rl16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere

  539.         avio_skip(pb, value_len - 2);

  540. 

  541.         if(stream_num<128){

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

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

  544.         }

  545.     }

  546. 

  547.     return 0;

  548. }

  549. 

  550. static int asf_read_marker(AVFormatContext *s, int64_t size)

  551. {

  552.     AVIOContext *pb = s->pb;

  553.     int i, count, name_len, ret;

  554.     char name[1024];

  555. 

  556.     avio_rl64(pb);            // reserved 16 bytes

  557.     avio_rl64(pb);            // ...

  558.     count = avio_rl32(pb);    // markers count

  559.     avio_rl16(pb);            // reserved 2 bytes

  560.     name_len = avio_rl16(pb); // name length

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

  562.         avio_r8(pb); // skip the name

  563.     }

  564. 

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

  566.         int64_t pres_time;

  567.         int name_len;

  568. 

  569.         avio_rl64(pb);             // offset, 8 bytes

  570.         pres_time = avio_rl64(pb); // presentation time

  571.         avio_rl16(pb);             // entry length

  572.         avio_rl32(pb);             // send time

  573.         avio_rl32(pb);             // flags

  574.         name_len = avio_rl32(pb);  // name length

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

  576.             avio_skip(pb, name_len - ret);

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

  578.     }

  579. 

  580.     return 0;

  581. }

  582. 

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

  584. {

  585.     ASFContext *asf = s->priv_data;

  586.     ff_asf_guid g;

  587.     AVIOContext *pb = s->pb;

  588.     int i;

  589.     int64_t gsize;

  590. 

  591.     ff_get_guid(pb, &g);

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

  593.         return -1;

  594.     avio_rl64(pb);

  595.     avio_rl32(pb);

  596.     avio_r8(pb);

  597.     avio_r8(pb);

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

  599.     for(;;) {

  600.         uint64_t gpos= avio_tell(pb);

  601.         ff_get_guid(pb, &g);

  602.         gsize = avio_rl64(pb);

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

  604.         print_guid(&g);

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

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

  607.             asf->data_object_offset = avio_tell(pb);

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

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

  610.                 asf->data_object_size = gsize - 24;

  611.             } else {

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

  613.             }

  614.             break;

  615.         }

  616.         if (gsize < 24)

  617.             return -1;

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

  619.             asf_read_file_properties(s, gsize);

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

  621.             asf_read_stream_properties(s, gsize);

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

  623.             asf_read_content_desc(s, gsize);

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

  625.             asf_read_language_list(s, gsize);

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

  627.             asf_read_ext_content_desc(s, gsize);

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

  629.             asf_read_metadata(s, gsize);

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

  631.             asf_read_ext_stream_properties(s, gsize);

  632. 

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

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

  635.             continue;

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

  637.             int v1, v2;

  638.             ff_get_guid(pb, &g);

  639.             v1 = avio_rl32(pb);

  640.             v2 = avio_rl16(pb);

  641.             continue;

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

  643.             asf_read_marker(s, gsize);

  644.         } else if (pb->eof_reached) {

  645.             return -1;

  646.         } else {

  647.             if (!s->keylen) {

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

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

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

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

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

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

  654.                 }

  655.             }

  656.         }

  657.         if(avio_tell(pb) != gpos + gsize)

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

  659.         avio_seek(pb, gpos + gsize, SEEK_SET);

  660.     }

  661.     ff_get_guid(pb, &g);

  662.     avio_rl64(pb);

  663.     avio_r8(pb);

  664.     avio_r8(pb);

  665.     if (pb->eof_reached)

  666.         return -1;

  667.     asf->data_offset = avio_tell(pb);

  668.     asf->packet_size_left = 0;

  669. 

  670. 

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

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

  673.         if(stream_num>=0){

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

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

  676.                 st->codec->bit_rate = asf->stream_bitrates[i];

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

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

  679.                           &st->sample_aspect_ratio.den,

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

  681.             } 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.

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

  683.                           &st->sample_aspect_ratio.den,

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

  685. 

  686. //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);

  687. 

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

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

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

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

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

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

  694.                     if (iso6392)

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

  696.                 }

  697.             }

  698.         }

  699.     }

  700. 

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

  702. 

  703.     return 0;

  704. }

  705. 

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

  707.     switch (bits & 3) \

  708.     { \

  709.     case 3: var = avio_rl32(pb); rsize += 4; break; \

  710.     case 2: var = avio_rl16(pb); rsize += 2; break; \

  711.     case 1: var = avio_r8(pb);   rsize++; break; \

  712.     default: var = defval; break; \

  713.     }

  714. 

  715. /**

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

  717.  * @param s demux context

  718.  * @param pb context to read data from

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

  720.  */

  721. static int ff_asf_get_packet(AVFormatContext *s, AVIOContext *pb)

  722. {

  723.     ASFContext *asf = s->priv_data;

  724.     uint32_t packet_length, padsize;

  725.     int rsize = 8;

  726.     int c, d, e, off;

  727. 

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

  729.     off= 32768;

  730.     if (s->packet_size > 0)

  731.         off= (avio_tell(pb) - s->data_offset) % s->packet_size + 3;

  732. 

  733.     c=d=e=-1;

  734.     while(off-- > 0){

  735.         c=d; d=e;

  736.         e= avio_r8(pb);

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

  738.             break;

  739.     }

  740. 

  741.     if (c != 0x82) {

  742.         /**

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

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

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

  746.          * the stream.

  747.          */

  748.         if (pb->error == AVERROR(EAGAIN))

  749.             return AVERROR(EAGAIN);

  750.         if (!pb->eof_reached)

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

  752.     }

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

  754.         if (d || e) {

  755.             if (!pb->eof_reached)

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

  757.             return -1;

  758.         }

  759.         c= avio_r8(pb);

  760.         d= avio_r8(pb);

  761.         rsize+=3;

  762.     }else{

  763.         avio_seek(pb, -1, SEEK_CUR); //FIXME

  764.     }

  765. 

  766.     asf->packet_flags    = c;

  767.     asf->packet_property = d;

  768. 

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

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

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

  772. 

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

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

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

  776.         return -1;

  777.     }

  778.     if(padsize >= packet_length){

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

  780.         return -1;

  781.     }

  782. 

  783.     asf->packet_timestamp = avio_rl32(pb);

  784.     avio_rl16(pb); /* duration */

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

  786. 

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

  788.         asf->packet_segsizetype = avio_r8(pb); rsize++;

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

  790.     } else {

  791.         asf->packet_segments = 1;

  792.         asf->packet_segsizetype = 0x80;

  793.     }

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

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

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

  797.     asf->packet_padsize = padsize;

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

  799.     return 0;

  800. }

  801. 

  802. /**

  803.  *

  804.  * @return <0 if error

  805.  */

  806. static int asf_read_frame_header(AVFormatContext *s, AVIOContext *pb){

  807.     ASFContext *asf = s->priv_data;

  808.     int rsize = 1;

  809.     int num = avio_r8(pb);

  810.     int64_t ts0, ts1;

  811. 

  812.     asf->packet_segments--;

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

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

  815.     // sequence should be ignored!

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

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

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

  819. //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);

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

  821.         asf->packet_obj_size = avio_rl32(pb);

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

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

  824.             return -1;

  825.         }

  826.         asf->packet_frag_timestamp = avio_rl32(pb); // timestamp

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

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

  829. //                av_log(s, AV_LOG_DEBUG, "%02X ",avio_r8(pb));

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

  831.             avio_skip(pb, 10);

  832.             ts0= avio_rl64(pb);

  833.             ts1= avio_rl64(pb);

  834.             avio_skip(pb, 12);

  835.             avio_rl32(pb);

  836.             avio_skip(pb, asf->packet_replic_size - 8 - 38 - 4);

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

  838.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  839.         }else

  840.             avio_skip(pb, asf->packet_replic_size - 8);

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

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

  843.         // multipacket - frag_offset is beginning timestamp

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

  845.         asf->packet_frag_offset = 0;

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

  847. 

  848.         asf->packet_time_delta = avio_r8(pb);

  849.         rsize++;

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

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

  852.         return -1;

  853.     }

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

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

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

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

  858.             return -1;

  859.         }

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

  861.     } else {

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

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

  864.     }

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

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

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

  868.             return -1;

  869.     }

  870.     asf->packet_size_left -= rsize;

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

  872. 

  873.     return 0;

  874. }

  875. 

  876. /**

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

  878.  * with asf_get_packet()).

  879.  * @param s demux context

  880.  * @param pb context to read data from

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

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

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

  884.  */

  885. static int ff_asf_parse_packet(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)

  886. {

  887.     ASFContext *asf = s->priv_data;

  888.     ASFStream *asf_st = 0;

  889.     for (;;) {

  890.         int ret;

  891.         if(pb->eof_reached)

  892.             return AVERROR_EOF;

  893.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  898.             assert(ret>=0);

  899.             /* fail safe */

  900.             avio_skip(pb, ret);

  901. 

  902.             asf->packet_pos= avio_tell(pb);

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

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

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

  906.             return 1;

  907.         }

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

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

  910.                 asf->packet_segments= 0;

  911.                 continue;

  912.             }

  913.             if (asf->stream_index < 0

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

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

  916.                 ) {

  917.                 asf->packet_time_start = 0;

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

  919.                 avio_skip(pb, asf->packet_frag_size);

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

  921.                 if(asf->stream_index < 0)

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

  923.                 continue;

  924.             }

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

  926.         }

  927.         asf_st = asf->asf_st;

  928. 

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

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

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

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

  933.             asf->packet_obj_size = asf->packet_frag_size = avio_r8(pb);

  934.             asf->packet_size_left--;

  935.             asf->packet_multi_size--;

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

  937.             {

  938.                 asf->packet_time_start = 0;

  939.                 avio_skip(pb, asf->packet_multi_size);

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

  941.                 continue;

  942.             }

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

  944.             //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);

  945.         }

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

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

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

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

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

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

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

  953.         }

  954. 

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

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

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

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

  959.                 asf_st->frag_offset = 0;

  960.                 av_free_packet(&asf_st->pkt);

  961.             }

  962.             /* new packet */

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

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

  965.             asf_st->pkt.dts = asf->packet_frag_timestamp - asf->hdr.preroll;

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

  967.             asf_st->pkt.pos =

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

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

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

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

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

  973.                 asf->packet_key_frame = 1;

  974.             if (asf->packet_key_frame)

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

  976.         }

  977. 

  978.         /* read data */

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

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

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

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

  983.         if (asf->packet_size_left < 0)

  984.             continue;

  985. 

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

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

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

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

  990.             continue;

  991.         }

  992. 

  993.         ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,

  994.                          asf->packet_frag_size);

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

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

  997.                 return ret < 0 ? ret : AVERROR_EOF;

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

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

  1000.                 // TODO: should we fill the whole packet instead of just the current

  1001.                 // fragment?

  1002.                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,

  1003.                        asf->packet_frag_size - ret);

  1004.                 ret = asf->packet_frag_size;

  1005.             } else

  1006.                 // no scrambling, so we can return partial packets

  1007.                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);

  1008.         }

  1009.         if (s->key && s->keylen == 20)

  1010.             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,

  1011.                             ret);

  1012.         asf_st->frag_offset += ret;

  1013.         /* test if whole packet is read */

  1014.         if (asf_st->frag_offset == asf_st->pkt.size) {

  1015.             //workaround for macroshit radio DVR-MS files

  1016.             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO

  1017.                && asf_st->pkt.size > 100){

  1018.                 int i;

  1019.                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);

  1020.                 if(i == asf_st->pkt.size){

  1021.                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");

  1022.                     asf_st->frag_offset = 0;

  1023.                     av_free_packet(&asf_st->pkt);

  1024.                     continue;

  1025.                 }

  1026.             }

  1027. 

  1028.             /* return packet */

  1029.             if (asf_st->ds_span > 1) {

  1030.               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){

  1031.                     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);

  1032.               }else{

  1033.                 /* packet descrambling */

  1034.                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);

  1035.                 if (newdata) {

  1036.                     int offset = 0;

  1037.                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

  1038.                     while (offset < asf_st->pkt.size) {

  1039.                         int off = offset / asf_st->ds_chunk_size;

  1040.                         int row = off / asf_st->ds_span;

  1041.                         int col = off % asf_st->ds_span;

  1042.                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;

  1043.                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);

  1044. 

  1045.                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);

  1046.                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);

  1047.                         memcpy(newdata + offset,

  1048.                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,

  1049.                                asf_st->ds_chunk_size);

  1050.                         offset += asf_st->ds_chunk_size;

  1051.                     }

  1052.                     av_free(asf_st->pkt.data);

  1053.                     asf_st->pkt.data = newdata;

  1054.                 }

  1055.               }

  1056.             }

  1057.             asf_st->frag_offset = 0;

  1058.             *pkt= asf_st->pkt;

  1059.             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);

  1060.             asf_st->pkt.size = 0;

  1061.             asf_st->pkt.data = 0;

  1062.             break; // packet completed

  1063.         }

  1064.     }

  1065.     return 0;

  1066. }

  1067. 

  1068. static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)

  1069. {

  1070.     ASFContext *asf = s->priv_data;

  1071. 

  1072.     for (;;) {

  1073.         int ret;

  1074. 

  1075.         /* parse cached packets, if any */

  1076.         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)

  1077.             return ret;

  1078.         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)

  1079.             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);

  1080.         asf->packet_time_start = 0;

  1081.     }

  1082. 

  1083.     return 0;

  1084. }

  1085. 

  1086. // Added to support seeking after packets have been read

  1087. // If information is not reset, read_packet fails due to

  1088. // leftover information from previous reads

  1089. static void asf_reset_header(AVFormatContext *s)

  1090. {

  1091.     ASFContext *asf = s->priv_data;

  1092.     ASFStream *asf_st;

  1093.     int i;

  1094. 

  1095.     asf->packet_size_left = 0;

  1096.     asf->packet_segments = 0;

  1097.     asf->packet_flags = 0;

  1098.     asf->packet_property = 0;

  1099.     asf->packet_timestamp = 0;

  1100.     asf->packet_segsizetype = 0;

  1101.     asf->packet_segments = 0;

  1102.     asf->packet_seq = 0;

  1103.     asf->packet_replic_size = 0;

  1104.     asf->packet_key_frame = 0;

  1105.     asf->packet_padsize = 0;

  1106.     asf->packet_frag_offset = 0;

  1107.     asf->packet_frag_size = 0;

  1108.     asf->packet_frag_timestamp = 0;

  1109.     asf->packet_multi_size = 0;

  1110.     asf->packet_obj_size = 0;

  1111.     asf->packet_time_delta = 0;

  1112.     asf->packet_time_start = 0;

  1113. 

  1114.     for(i=0; i<s->nb_streams; i++){

  1115.         asf_st= s->streams[i]->priv_data;

  1116.         av_free_packet(&asf_st->pkt);

  1117.         asf_st->frag_offset=0;

  1118.         asf_st->seq=0;

  1119.     }

  1120.     asf->asf_st= NULL;

  1121. }

  1122. 

  1123. static int asf_read_close(AVFormatContext *s)

  1124. {

  1125.     int i;

  1126. 

  1127.     asf_reset_header(s);

  1128.     for(i=0;i<s->nb_streams;i++) {

  1129.         AVStream *st = s->streams[i];

  1130.         av_free(st->codec->palctrl);

  1131.     }

  1132.     return 0;

  1133. }

  1134. 

  1135. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  1136. {

  1137.     AVPacket pkt1, *pkt = &pkt1;

  1138.     ASFStream *asf_st;

  1139.     int64_t pts;

  1140.     int64_t pos= *ppos;

  1141.     int i;

  1142.     int64_t start_pos[ASF_MAX_STREAMS];

  1143. 

  1144.     for(i=0; i<s->nb_streams; i++){

  1145.         start_pos[i]= pos;

  1146.     }

  1147. 

  1148.     if (s->packet_size > 0)

  1149.         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;

  1150.     *ppos= pos;

  1151.     avio_seek(s->pb, pos, SEEK_SET);

  1152. 

  1153. //printf("asf_read_pts\n");

  1154.     asf_reset_header(s);

  1155.     for(;;){

  1156.         if (av_read_frame(s, pkt) < 0){

  1157.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1158.             return AV_NOPTS_VALUE;

  1159.         }

  1160. 

  1161.         pts= pkt->pts;

  1162. 

  1163.         av_free_packet(pkt);

  1164.         if(pkt->flags&AV_PKT_FLAG_KEY){

  1165.             i= pkt->stream_index;

  1166. 

  1167.             asf_st= s->streams[i]->priv_data;

  1168. 

  1169. //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);

  1170.             pos= asf_st->packet_pos;

  1171. 

  1172.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1173.             start_pos[i]= asf_st->packet_pos + 1;

  1174. 

  1175.             if(pkt->stream_index == stream_index)

  1176.                break;

  1177.         }

  1178.     }

  1179. 

  1180.     *ppos= pos;

  1181. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1182. 

  1183.     return pts;

  1184. }

  1185. 

  1186. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1187. {

  1188.     ff_asf_guid g;

  1189.     ASFContext *asf = s->priv_data;

  1190.     int64_t current_pos= avio_tell(s->pb);

  1191.     int i;

  1192. 

  1193.     avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);

  1194.     ff_get_guid(s->pb, &g);

  1195. 

  1196.     /* the data object can be followed by other top-level objects,

  1197.        skip them until the simple index object is reached */

  1198.     while (ff_guidcmp(&g, &index_guid)) {

  1199.         int64_t gsize= avio_rl64(s->pb);

  1200.         if (gsize < 24 || s->pb->eof_reached) {

  1201.             avio_seek(s->pb, current_pos, SEEK_SET);

  1202.             return;

  1203.         }

  1204.         avio_skip(s->pb, gsize-24);

  1205.         ff_get_guid(s->pb, &g);

  1206.     }

  1207. 

  1208.     {

  1209.         int64_t itime, last_pos=-1;

  1210.         int pct, ict;

  1211.         int64_t av_unused gsize= avio_rl64(s->pb);

  1212.         ff_get_guid(s->pb, &g);

  1213.         itime=avio_rl64(s->pb);

  1214.         pct=avio_rl32(s->pb);

  1215.         ict=avio_rl32(s->pb);

  1216.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1217. 

  1218.         for (i=0;i<ict;i++){

  1219.             int pktnum=avio_rl32(s->pb);

  1220.             int pktct =avio_rl16(s->pb);

  1221.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1222.             int64_t index_pts= FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);

  1223. 

  1224.             if(pos != last_pos){

  1225.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d  pts: %"PRId64"\n", pktnum, pktct, index_pts);

  1226.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1227.             last_pos=pos;

  1228.             }

  1229.         }

  1230.         asf->index_read= 1;

  1231.     }

  1232.     avio_seek(s->pb, current_pos, SEEK_SET);

  1233. }

  1234. 

  1235. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1236. {

  1237.     ASFContext *asf = s->priv_data;

  1238.     AVStream *st = s->streams[stream_index];

  1239.     int64_t pos;

  1240.     int index;

  1241. 

  1242.     if (s->packet_size <= 0)

  1243.         return -1;

  1244. 

  1245.     /* Try using the protocol's read_seek if available */

  1246.     if(s->pb) {

  1247.         int ret = avio_seek_time(s->pb, stream_index, pts, flags);

  1248.         if(ret >= 0)

  1249.             asf_reset_header(s);

  1250.         if (ret != AVERROR(ENOSYS))

  1251.             return ret;

  1252.     }

  1253. 

  1254.     if (!asf->index_read)

  1255.         asf_build_simple_index(s, stream_index);

  1256. 

  1257.     if(!(asf->index_read && st->index_entries)){

  1258.         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)

  1259.             return -1;

  1260.     }else{

  1261.         index= av_index_search_timestamp(st, pts, flags);

  1262.         if(index<0)

  1263.             return -1;

  1264. 

  1265.         /* find the position */

  1266.         pos = st->index_entries[index].pos;

  1267. 

  1268.     // various attempts to find key frame have failed so far

  1269.     //    asf_reset_header(s);

  1270.     //    avio_seek(s->pb, pos, SEEK_SET);

  1271.     //    key_pos = pos;

  1272.     //     for(i=0;i<16;i++){

  1273.     //         pos = avio_tell(s->pb);

  1274.     //         if (av_read_frame(s, &pkt) < 0){

  1275.     //             av_log(s, AV_LOG_INFO, "seek failed\n");

  1276.     //             return -1;

  1277.     //         }

  1278.     //         asf_st = s->streams[stream_index]->priv_data;

  1279.     //         pos += st->parser->frame_offset;

  1280.     //

  1281.     //         if (pkt.size > b) {

  1282.     //             b = pkt.size;

  1283.     //             key_pos = pos;

  1284.     //         }

  1285.     //

  1286.     //         av_free_packet(&pkt);

  1287.     //     }

  1288. 

  1289.         /* do the seek */

  1290.         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1291.         avio_seek(s->pb, pos, SEEK_SET);

  1292.     }

  1293.     asf_reset_header(s);

  1294.     return 0;

  1295. }

  1296. 

  1297. AVInputFormat ff_asf_demuxer = {

  1298.     "asf",

  1299.     NULL_IF_CONFIG_SMALL("ASF format"),

  1300.     sizeof(ASFContext),

  1301.     asf_probe,

  1302.     asf_read_header,

  1303.     asf_read_packet,

  1304.     asf_read_close,

  1305.     asf_read_seek,

  1306.     asf_read_pts,

  1307. };