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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/bswap.h"

  25. #include "libavutil/common.h"

  26. #include "libavutil/avstring.h"

  27. #include "libavcodec/mpegaudio.h"

  28. #include "avformat.h"

  29. #include "avio_internal.h"

  30. #include "riff.h"

  31. #include "asf.h"

  32. #include "asfcrypt.h"

  33. #include "avlanguage.h"

  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(AVIOContext *s, ff_asf_guid *g)

  136. {

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

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

  151.     switch(type){

  152.         case 2: return avio_rl32(pb);

  153.         case 3: return avio_rl32(pb);

  154.         case 4: return avio_rl64(pb);

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

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

  183. finish:

  184.     av_freep(&value);

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

  186. }

  187. 

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

  189. {

  190.     ASFContext *asf = s->priv_data;

  191.     AVIOContext *pb = s->pb;

  192. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  206. 

  207.     return 0;

  208. }

  209. 

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

  211. {

  212.     ASFContext *asf = s->priv_data;

  213.     AVIOContext *pb = s->pb;

  214.     AVStream *st;

  215.     ASFStream *asf_st;

  216.     ff_asf_guid g;

  217.     enum AVMediaType type;

  218.     int type_specific_size, sizeX;

  219.     uint64_t total_size;

  220.     unsigned int tag1;

  221.     int64_t pos1, pos2, start_time;

  222.     int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  223. 

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

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

  226.         return AVERROR(EINVAL);

  227.     }

  228. 

  229.     pos1 = avio_tell(pb);

  230. 

  231.     st = av_new_stream(s, 0);

  232.     if (!st)

  233.         return AVERROR(ENOMEM);

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

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

  236.     if (!asf_st)

  237.         return AVERROR(ENOMEM);

  238.     st->priv_data = asf_st;

  239.     st->start_time = 0;

  240.     start_time = asf->hdr.preroll;

  241. 

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

  243. 

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

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

  246.             (10000000 / 1000) - start_time;

  247.     }

  248.     ff_get_guid(pb, &g);

  249. 

  250.     test_for_ext_stream_audio = 0;

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

  252.         type = AVMEDIA_TYPE_AUDIO;

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

  254.         type = AVMEDIA_TYPE_VIDEO;

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

  256.         type = AVMEDIA_TYPE_VIDEO;

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

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

  259.         type = AVMEDIA_TYPE_DATA;

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

  261.         test_for_ext_stream_audio = 1;

  262.         type = AVMEDIA_TYPE_UNKNOWN;

  263.     } else {

  264.         return -1;

  265.     }

  266.     ff_get_guid(pb, &g);

  267.     total_size = avio_rl64(pb);

  268.     type_specific_size = avio_rl32(pb);

  269.     avio_rl32(pb);

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

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

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

  273. 

  274.     avio_rl32(pb);

  275. 

  276.     if (test_for_ext_stream_audio) {

  277.         ff_get_guid(pb, &g);

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

  279.             type = AVMEDIA_TYPE_AUDIO;

  280.             is_dvr_ms_audio=1;

  281.             ff_get_guid(pb, &g);

  282.             avio_rl32(pb);

  283.             avio_rl32(pb);

  284.             avio_rl32(pb);

  285.             ff_get_guid(pb, &g);

  286.             avio_rl32(pb);

  287.         }

  288.     }

  289. 

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

  291.     if (type == AVMEDIA_TYPE_AUDIO) {

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

  293.         if (ret < 0)

  294.             return ret;

  295.         if (is_dvr_ms_audio) {

  296.             // codec_id and codec_tag are unreliable in dvr_ms

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

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

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

  300.         }

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

  302.             st->need_parsing = AVSTREAM_PARSE_NONE;

  303.         } else {

  304.             st->need_parsing = AVSTREAM_PARSE_FULL;

  305.         }

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

  307.         pos2 = avio_tell(pb);

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

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

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

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

  312.             avio_rl16(pb); //ds_data_size

  313.             avio_r8(pb);   //ds_silence_data

  314.         }

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

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

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

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

  319.             if (!asf_st->ds_chunk_size

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

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

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

  323.         }

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

  325.             case CODEC_ID_MP3:

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

  327.                 break;

  328.             case CODEC_ID_PCM_S16LE:

  329.             case CODEC_ID_PCM_S16BE:

  330.             case CODEC_ID_PCM_U16LE:

  331.             case CODEC_ID_PCM_U16BE:

  332.             case CODEC_ID_PCM_S8:

  333.             case CODEC_ID_PCM_U8:

  334.             case CODEC_ID_PCM_ALAW:

  335.             case CODEC_ID_PCM_MULAW:

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

  337.                 break;

  338.             default:

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

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

  341.                 break;

  342.         }

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

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

  345.         avio_rl32(pb);

  346.         avio_rl32(pb);

  347.         avio_r8(pb);

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

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

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

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

  352.         /* not available for asf */

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

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

  355.         tag1 = avio_rl32(pb);

  356.         avio_skip(pb, 20);

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

  358.         if (sizeX > 40) {

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

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

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

  362.         }

  363. 

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

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

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

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

  368.             int av_unused i;

  369. #if HAVE_BIGENDIAN

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

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

  372. #else

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

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

  375. #endif

  376.             asf_st->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 (rsize > asf->packet_size_left) {

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

  858.             return -1;

  859.         } else if(asf->packet_frag_size > asf->packet_size_left - rsize){

  860.             if (asf->packet_frag_size > asf->packet_size_left - rsize + asf->packet_padsize) {

  861.                 av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid (%d-%d)\n", asf->packet_size_left, rsize);

  862.                 return -1;

  863.             } else {

  864.                 int diff = asf->packet_frag_size - (asf->packet_size_left - rsize);

  865.                 asf->packet_size_left += diff;

  866.                 asf->packet_padsize   -= diff;

  867.             }

  868.         }

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

  870.     } else {

  871.         if (rsize > asf->packet_size_left) {

  872.             av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");

  873.             return -1;

  874.         }

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

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

  877.     }

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

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

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

  881.             return -1;

  882.     }

  883.     asf->packet_size_left -= rsize;

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

  885. 

  886.     return 0;

  887. }

  888. 

  889. /**

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

  891.  * with asf_get_packet()).

  892.  * @param s demux context

  893.  * @param pb context to read data from

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

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

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

  897.  */

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

  899. {

  900.     ASFContext *asf = s->priv_data;

  901.     ASFStream *asf_st = 0;

  902.     for (;;) {

  903.         int ret;

  904.         if(pb->eof_reached)

  905.             return AVERROR_EOF;

  906.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  911.             assert(ret>=0);

  912.             /* fail safe */

  913.             avio_skip(pb, ret);

  914. 

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

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

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

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

  919.             return 1;

  920.         }

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

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

  923.                 asf->packet_segments= 0;

  924.                 continue;

  925.             }

  926.             if (asf->stream_index < 0

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

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

  929.                 ) {

  930.                 asf->packet_time_start = 0;

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

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

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

  934.                 if(asf->stream_index < 0)

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

  936.                 continue;

  937.             }

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

  939.         }

  940.         asf_st = asf->asf_st;

  941. 

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

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

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

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

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

  947.             asf->packet_size_left--;

  948.             asf->packet_multi_size--;

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

  950.             {

  951.                 asf->packet_time_start = 0;

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

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

  954.                 continue;

  955.             }

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

  957.             //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);

  958.         }

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

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

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

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

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

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

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

  966.         }

  967. 

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

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

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

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

  972.                 asf_st->frag_offset = 0;

  973.                 av_free_packet(&asf_st->pkt);

  974.             }

  975.             /* new packet */

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

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

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

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

  980.             asf_st->pkt.pos =

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

  982.             if (asf_st->pkt.data && asf_st->palette_changed) {

  983.                 uint8_t *pal;

  984.                 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE,

  985.                                               AVPALETTE_SIZE);

  986.                 if (!pal) {

  987.                     av_log(s, AV_LOG_ERROR, "Cannot append palette to packet\n");

  988.                 } else {

  989.                     memcpy(pal, asf_st->palette, AVPALETTE_SIZE);

  990.                     asf_st->palette_changed = 0;

  991.                 }

  992.             }

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

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

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

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

  997.                 asf->packet_key_frame = 1;

  998.             if (asf->packet_key_frame)

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

  1000.         }

  1001. 

  1002.         /* read data */

  1003.         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",

  1004.         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,

  1005.         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);

  1006.         asf->packet_size_left -= asf->packet_frag_size;

  1007.         if (asf->packet_size_left < 0)

  1008.             continue;

  1009. 

  1010.         if(   asf->packet_frag_offset >= asf_st->pkt.size

  1011.            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){

  1012.             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",

  1013.                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);

  1014.             continue;

  1015.         }

  1016. 

  1017.         ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,

  1018.                          asf->packet_frag_size);

  1019.         if (ret != asf->packet_frag_size) {

  1020.             if (ret < 0 || asf->packet_frag_offset + ret == 0)

  1021.                 return ret < 0 ? ret : AVERROR_EOF;

  1022.             if (asf_st->ds_span > 1) {

  1023.                 // scrambling, we can either drop it completely or fill the remainder

  1024.                 // TODO: should we fill the whole packet instead of just the current

  1025.                 // fragment?

  1026.                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,

  1027.                        asf->packet_frag_size - ret);

  1028.                 ret = asf->packet_frag_size;

  1029.             } else

  1030.                 // no scrambling, so we can return partial packets

  1031.                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);

  1032.         }

  1033.         if (s->key && s->keylen == 20)

  1034.             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,

  1035.                             ret);

  1036.         asf_st->frag_offset += ret;

  1037.         /* test if whole packet is read */

  1038.         if (asf_st->frag_offset == asf_st->pkt.size) {

  1039.             //workaround for macroshit radio DVR-MS files

  1040.             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO

  1041.                && asf_st->pkt.size > 100){

  1042.                 int i;

  1043.                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);

  1044.                 if(i == asf_st->pkt.size){

  1045.                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");

  1046.                     asf_st->frag_offset = 0;

  1047.                     av_free_packet(&asf_st->pkt);

  1048.                     continue;

  1049.                 }

  1050.             }

  1051. 

  1052.             /* return packet */

  1053.             if (asf_st->ds_span > 1) {

  1054.               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){

  1055.                     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);

  1056.               }else{

  1057.                 /* packet descrambling */

  1058.                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);

  1059.                 if (newdata) {

  1060.                     int offset = 0;

  1061.                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

  1062.                     while (offset < asf_st->pkt.size) {

  1063.                         int off = offset / asf_st->ds_chunk_size;

  1064.                         int row = off / asf_st->ds_span;

  1065.                         int col = off % asf_st->ds_span;

  1066.                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;

  1067.                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);

  1068. 

  1069.                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);

  1070.                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);

  1071.                         memcpy(newdata + offset,

  1072.                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,

  1073.                                asf_st->ds_chunk_size);

  1074.                         offset += asf_st->ds_chunk_size;

  1075.                     }

  1076.                     av_free(asf_st->pkt.data);

  1077.                     asf_st->pkt.data = newdata;

  1078.                 }

  1079.               }

  1080.             }

  1081.             asf_st->frag_offset = 0;

  1082.             *pkt= asf_st->pkt;

  1083.             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);

  1084.             asf_st->pkt.size = 0;

  1085.             asf_st->pkt.data = 0;

  1086.             break; // packet completed

  1087.         }

  1088.     }

  1089.     return 0;

  1090. }

  1091. 

  1092. static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)

  1093. {

  1094.     ASFContext *asf = s->priv_data;

  1095. 

  1096.     for (;;) {

  1097.         int ret;

  1098. 

  1099.         /* parse cached packets, if any */

  1100.         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)

  1101.             return ret;

  1102.         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)

  1103.             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);

  1104.         asf->packet_time_start = 0;

  1105.     }

  1106. 

  1107.     return 0;

  1108. }

  1109. 

  1110. // Added to support seeking after packets have been read

  1111. // If information is not reset, read_packet fails due to

  1112. // leftover information from previous reads

  1113. static void asf_reset_header(AVFormatContext *s)

  1114. {

  1115.     ASFContext *asf = s->priv_data;

  1116.     ASFStream *asf_st;

  1117.     int i;

  1118. 

  1119.     asf->packet_size_left = 0;

  1120.     asf->packet_segments = 0;

  1121.     asf->packet_flags = 0;

  1122.     asf->packet_property = 0;

  1123.     asf->packet_timestamp = 0;

  1124.     asf->packet_segsizetype = 0;

  1125.     asf->packet_segments = 0;

  1126.     asf->packet_seq = 0;

  1127.     asf->packet_replic_size = 0;

  1128.     asf->packet_key_frame = 0;

  1129.     asf->packet_padsize = 0;

  1130.     asf->packet_frag_offset = 0;

  1131.     asf->packet_frag_size = 0;

  1132.     asf->packet_frag_timestamp = 0;

  1133.     asf->packet_multi_size = 0;

  1134.     asf->packet_obj_size = 0;

  1135.     asf->packet_time_delta = 0;

  1136.     asf->packet_time_start = 0;

  1137. 

  1138.     for(i=0; i<s->nb_streams; i++){

  1139.         asf_st= s->streams[i]->priv_data;

  1140.         av_free_packet(&asf_st->pkt);

  1141.         asf_st->frag_offset=0;

  1142.         asf_st->seq=0;

  1143.     }

  1144.     asf->asf_st= NULL;

  1145. }

  1146. 

  1147. static int asf_read_close(AVFormatContext *s)

  1148. {

  1149.     asf_reset_header(s);

  1150. 

  1151.     return 0;

  1152. }

  1153. 

  1154. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  1155. {

  1156.     AVPacket pkt1, *pkt = &pkt1;

  1157.     ASFStream *asf_st;

  1158.     int64_t pts;

  1159.     int64_t pos= *ppos;

  1160.     int i;

  1161.     int64_t start_pos[ASF_MAX_STREAMS];

  1162. 

  1163.     for(i=0; i<s->nb_streams; i++){

  1164.         start_pos[i]= pos;

  1165.     }

  1166. 

  1167.     if (s->packet_size > 0)

  1168.         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;

  1169.     *ppos= pos;

  1170.     avio_seek(s->pb, pos, SEEK_SET);

  1171. 

  1172. //printf("asf_read_pts\n");

  1173.     asf_reset_header(s);

  1174.     for(;;){

  1175.         if (av_read_frame(s, pkt) < 0){

  1176.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1177.             return AV_NOPTS_VALUE;

  1178.         }

  1179. 

  1180.         pts= pkt->pts;

  1181. 

  1182.         av_free_packet(pkt);

  1183.         if(pkt->flags&AV_PKT_FLAG_KEY){

  1184.             i= pkt->stream_index;

  1185. 

  1186.             asf_st= s->streams[i]->priv_data;

  1187. 

  1188. //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);

  1189.             pos= asf_st->packet_pos;

  1190. 

  1191.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1192.             start_pos[i]= asf_st->packet_pos + 1;

  1193. 

  1194.             if(pkt->stream_index == stream_index)

  1195.                break;

  1196.         }

  1197.     }

  1198. 

  1199.     *ppos= pos;

  1200. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1201. 

  1202.     return pts;

  1203. }

  1204. 

  1205. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1206. {

  1207.     ff_asf_guid g;

  1208.     ASFContext *asf = s->priv_data;

  1209.     int64_t current_pos= avio_tell(s->pb);

  1210.     int i;

  1211. 

  1212.     avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);

  1213.     ff_get_guid(s->pb, &g);

  1214. 

  1215.     /* the data object can be followed by other top-level objects,

  1216.        skip them until the simple index object is reached */

  1217.     while (ff_guidcmp(&g, &index_guid)) {

  1218.         int64_t gsize= avio_rl64(s->pb);

  1219.         if (gsize < 24 || s->pb->eof_reached) {

  1220.             avio_seek(s->pb, current_pos, SEEK_SET);

  1221.             return;

  1222.         }

  1223.         avio_skip(s->pb, gsize-24);

  1224.         ff_get_guid(s->pb, &g);

  1225.     }

  1226. 

  1227.     {

  1228.         int64_t itime, last_pos=-1;

  1229.         int pct, ict;

  1230.         int64_t av_unused gsize= avio_rl64(s->pb);

  1231.         ff_get_guid(s->pb, &g);

  1232.         itime=avio_rl64(s->pb);

  1233.         pct=avio_rl32(s->pb);

  1234.         ict=avio_rl32(s->pb);

  1235.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1236. 

  1237.         for (i=0;i<ict;i++){

  1238.             int pktnum=avio_rl32(s->pb);

  1239.             int pktct =avio_rl16(s->pb);

  1240.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1241.             int64_t index_pts= FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);

  1242. 

  1243.             if(pos != last_pos){

  1244.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d  pts: %"PRId64"\n", pktnum, pktct, index_pts);

  1245.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1246.             last_pos=pos;

  1247.             }

  1248.         }

  1249.         asf->index_read= 1;

  1250.     }

  1251.     avio_seek(s->pb, current_pos, SEEK_SET);

  1252. }

  1253. 

  1254. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1255. {

  1256.     ASFContext *asf = s->priv_data;

  1257.     AVStream *st = s->streams[stream_index];

  1258.     int64_t pos;

  1259.     int index;

  1260. 

  1261.     if (s->packet_size <= 0)

  1262.         return -1;

  1263. 

  1264.     /* Try using the protocol's read_seek if available */

  1265.     if(s->pb) {

  1266.         int ret = avio_seek_time(s->pb, stream_index, pts, flags);

  1267.         if(ret >= 0)

  1268.             asf_reset_header(s);

  1269.         if (ret != AVERROR(ENOSYS))

  1270.             return ret;

  1271.     }

  1272. 

  1273.     if (!asf->index_read)

  1274.         asf_build_simple_index(s, stream_index);

  1275. 

  1276.     if((asf->index_read && st->index_entries)){

  1277.         index= av_index_search_timestamp(st, pts, flags);

  1278.         if(index >= 0) {

  1279.             /* find the position */

  1280.             pos = st->index_entries[index].pos;

  1281. 

  1282.             /* do the seek */

  1283.             av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1284.             avio_seek(s->pb, pos, SEEK_SET);

  1285.             asf_reset_header(s);

  1286.             return 0;

  1287.         }

  1288.     }

  1289.     /* no index or seeking by index failed */

  1290.     if(av_seek_frame_binary(s, stream_index, pts, flags)<0)

  1291.         return -1;

  1292.     asf_reset_header(s);

  1293.     return 0;

  1294. }

  1295. 

  1296. AVInputFormat ff_asf_demuxer = {

  1297.     "asf",

  1298.     NULL_IF_CONFIG_SMALL("ASF format"),

  1299.     sizeof(ASFContext),

  1300.     asf_probe,

  1301.     asf_read_header,

  1302.     asf_read_packet,

  1303.     asf_read_close,

  1304.     asf_read_seek,

  1305.     asf_read_pts,

  1306.     .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,

  1307. };