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FFmpeg/libavformat/asfdec.c

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  1. /*

  2.  * ASF compatible demuxer

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

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. //#define DEBUG

  23. 

  24. #include "libavutil/common.h"

  25. #include "libavutil/avstring.h"

  26. #include "libavcodec/mpegaudio.h"

  27. #include "avformat.h"

  28. #include "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. static int asf_probe(AVProbeData *pd)

  135. {

  136.     /* check file header */

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

  138.         return AVPROBE_SCORE_MAX;

  139.     else

  140.         return 0;

  141. }

  142. 

  143. static int get_value(AVIOContext *pb, int type){

  144.     switch(type){

  145.         case 2: return avio_rl32(pb);

  146.         case 3: return avio_rl32(pb);

  147.         case 4: return avio_rl64(pb);

  148.         case 5: return avio_rl16(pb);

  149.         default:return INT_MIN;

  150.     }

  151. }

  152. 

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

  154. {

  155.     char *value;

  156.     int64_t off = avio_tell(s->pb);

  157. 

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

  159.         return;

  160. 

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

  162.     if (!value)

  163.         goto finish;

  164. 

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

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

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

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

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

  170.     } else {

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

  172.         goto finish;

  173.     }

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

  175. finish:

  176.     av_freep(&value);

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

  178. }

  179. 

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

  181. {

  182.     ASFContext *asf = s->priv_data;

  183.     AVIOContext *pb = s->pb;

  184. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  198. 

  199.     return 0;

  200. }

  201. 

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

  203. {

  204.     ASFContext *asf = s->priv_data;

  205.     AVIOContext *pb = s->pb;

  206.     AVStream *st;

  207.     ASFStream *asf_st;

  208.     ff_asf_guid g;

  209.     enum AVMediaType type;

  210.     int type_specific_size, sizeX;

  211.     uint64_t total_size;

  212.     unsigned int tag1;

  213.     int64_t pos1, pos2, start_time;

  214.     int test_for_ext_stream_audio, is_dvr_ms_audio=0;

  215. 

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

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

  218.         return AVERROR(EINVAL);

  219.     }

  220. 

  221.     pos1 = avio_tell(pb);

  222. 

  223.     st = av_new_stream(s, 0);

  224.     if (!st)

  225.         return AVERROR(ENOMEM);

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

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

  228.     if (!asf_st)

  229.         return AVERROR(ENOMEM);

  230.     st->priv_data = asf_st;

  231.     start_time = asf->hdr.preroll;

  232. 

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

  234. 

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

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

  237.             (10000000 / 1000) - start_time;

  238.     }

  239.     ff_get_guid(pb, &g);

  240. 

  241.     test_for_ext_stream_audio = 0;

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

  243.         type = AVMEDIA_TYPE_AUDIO;

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

  245.         type = AVMEDIA_TYPE_VIDEO;

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

  247.         type = AVMEDIA_TYPE_VIDEO;

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

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

  250.         type = AVMEDIA_TYPE_DATA;

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

  252.         test_for_ext_stream_audio = 1;

  253.         type = AVMEDIA_TYPE_UNKNOWN;

  254.     } else {

  255.         return -1;

  256.     }

  257.     ff_get_guid(pb, &g);

  258.     total_size = avio_rl64(pb);

  259.     type_specific_size = avio_rl32(pb);

  260.     avio_rl32(pb);

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

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

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

  264. 

  265.     avio_rl32(pb);

  266. 

  267.     if (test_for_ext_stream_audio) {

  268.         ff_get_guid(pb, &g);

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

  270.             type = AVMEDIA_TYPE_AUDIO;

  271.             is_dvr_ms_audio=1;

  272.             ff_get_guid(pb, &g);

  273.             avio_rl32(pb);

  274.             avio_rl32(pb);

  275.             avio_rl32(pb);

  276.             ff_get_guid(pb, &g);

  277.             avio_rl32(pb);

  278.         }

  279.     }

  280. 

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

  282.     if (type == AVMEDIA_TYPE_AUDIO) {

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

  284.         if (ret < 0)

  285.             return ret;

  286.         if (is_dvr_ms_audio) {

  287.             // codec_id and codec_tag are unreliable in dvr_ms

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

  289.             st->request_probe= 1;

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

  291.         }

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

  293.             st->need_parsing = AVSTREAM_PARSE_NONE;

  294.         } else {

  295.             st->need_parsing = AVSTREAM_PARSE_FULL;

  296.         }

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

  298.         pos2 = avio_tell(pb);

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

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

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

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

  303.             avio_rl16(pb); //ds_data_size

  304.             avio_r8(pb);   //ds_silence_data

  305.         }

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

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

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

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

  310.             if (!asf_st->ds_chunk_size

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

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

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

  314.         }

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

  316.             case CODEC_ID_MP3:

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

  318.                 break;

  319.             case CODEC_ID_PCM_S16LE:

  320.             case CODEC_ID_PCM_S16BE:

  321.             case CODEC_ID_PCM_U16LE:

  322.             case CODEC_ID_PCM_U16BE:

  323.             case CODEC_ID_PCM_S8:

  324.             case CODEC_ID_PCM_U8:

  325.             case CODEC_ID_PCM_ALAW:

  326.             case CODEC_ID_PCM_MULAW:

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

  328.                 break;

  329.             default:

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

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

  332.                 break;

  333.         }

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

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

  336.         avio_rl32(pb);

  337.         avio_rl32(pb);

  338.         avio_r8(pb);

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

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

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

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

  343.         /* not available for asf */

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

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

  346.         tag1 = avio_rl32(pb);

  347.         avio_skip(pb, 20);

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

  349.         if (sizeX > 40) {

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

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

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

  353.         }

  354. 

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

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

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

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

  359.             int av_unused i;

  360. #if HAVE_BIGENDIAN

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

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

  363. #else

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

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

  366. #endif

  367.             asf_st->palette_changed = 1;

  368.         }

  369. 

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

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

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

  373.             st->need_parsing = AVSTREAM_PARSE_FULL;

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

  375.             st->codec->width  =

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

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

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

  379.         }

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

  381.             st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;

  382.     }

  383.     pos2 = avio_tell(pb);

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

  385. 

  386.     return 0;

  387. }

  388. 

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

  390. {

  391.     ASFContext *asf = s->priv_data;

  392.     AVIOContext *pb = s->pb;

  393.     ff_asf_guid g;

  394.     int ext_len, payload_ext_ct, stream_ct, i;

  395.     uint32_t ext_d, leak_rate, stream_num;

  396.     unsigned int stream_languageid_index;

  397. 

  398.     avio_rl64(pb); // starttime

  399.     avio_rl64(pb); // endtime

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

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

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

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

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

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

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

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

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

  409. 

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

  411.     if (stream_num < 128)

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

  413. 

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

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

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

  417. 

  418.     if (stream_num < 128)

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

  420. 

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

  422.         avio_rl16(pb);

  423.         ext_len = avio_rl16(pb);

  424.         avio_skip(pb, ext_len);

  425.     }

  426. 

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

  428.         ff_get_guid(pb, &g);

  429.         ext_d=avio_rl16(pb);

  430.         ext_len=avio_rl32(pb);

  431.         avio_skip(pb, ext_len);

  432.     }

  433. 

  434.     return 0;

  435. }

  436. 

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

  438. {

  439.     AVIOContext *pb = s->pb;

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

  441. 

  442.     len1 = avio_rl16(pb);

  443.     len2 = avio_rl16(pb);

  444.     len3 = avio_rl16(pb);

  445.     len4 = avio_rl16(pb);

  446.     len5 = avio_rl16(pb);

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

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

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

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

  451.     avio_skip(pb, len5);

  452. 

  453.     return 0;

  454. }

  455. 

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

  457. {

  458.     AVIOContext *pb = s->pb;

  459.     ASFContext *asf = s->priv_data;

  460.     int desc_count, i, ret;

  461. 

  462.     desc_count = avio_rl16(pb);

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

  464.         int name_len,value_type,value_len;

  465.         char name[1024];

  466. 

  467.         name_len = avio_rl16(pb);

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

  469.             name_len += 1;

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

  471.             avio_skip(pb, name_len - ret);

  472.         value_type = avio_rl16(pb);

  473.         value_len  = avio_rl16(pb);

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

  475.             value_len += 1;

  476.         /**

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

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

  479.          */

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

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

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

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

  484.         } else

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

  486.     }

  487. 

  488.     return 0;

  489. }

  490. 

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

  492. {

  493.     AVIOContext *pb = s->pb;

  494.     ASFContext *asf = s->priv_data;

  495.     int j, ret;

  496.     int stream_count = avio_rl16(pb);

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

  498.         char lang[6];

  499.         unsigned int lang_len = avio_r8(pb);

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

  501.             avio_skip(pb, lang_len - ret);

  502.         if (j < 128)

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

  504.     }

  505. 

  506.     return 0;

  507. }

  508. 

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

  510. {

  511.     AVIOContext *pb = s->pb;

  512.     ASFContext *asf = s->priv_data;

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

  514.     int ret, i;

  515.     n = avio_rl16(pb);

  516. 

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

  518.         char name[1024];

  519. 

  520.         avio_rl16(pb); //lang_list_index

  521.         stream_num= avio_rl16(pb);

  522.         name_len=   avio_rl16(pb);

  523.         value_type= avio_rl16(pb);

  524.         value_len=  avio_rl32(pb);

  525. 

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

  527.             avio_skip(pb, name_len - ret);

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

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

  530.         avio_skip(pb, value_len - 2);

  531. 

  532.         if(stream_num<128){

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

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

  535.         }

  536.     }

  537. 

  538.     return 0;

  539. }

  540. 

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

  542. {

  543.     AVIOContext *pb = s->pb;

  544.     int i, count, name_len, ret;

  545.     char name[1024];

  546. 

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

  548.     avio_rl64(pb);            // ...

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

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

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

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

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

  554.     }

  555. 

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

  557.         int64_t pres_time;

  558.         int name_len;

  559. 

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

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

  562.         avio_rl16(pb);             // entry length

  563.         avio_rl32(pb);             // send time

  564.         avio_rl32(pb);             // flags

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

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

  567.             avio_skip(pb, name_len - ret);

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

  569.     }

  570. 

  571.     return 0;

  572. }

  573. 

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

  575. {

  576.     ASFContext *asf = s->priv_data;

  577.     ff_asf_guid g;

  578.     AVIOContext *pb = s->pb;

  579.     int i;

  580.     int64_t gsize;

  581. 

  582.     ff_get_guid(pb, &g);

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

  584.         return -1;

  585.     avio_rl64(pb);

  586.     avio_rl32(pb);

  587.     avio_r8(pb);

  588.     avio_r8(pb);

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

  590.     for(;;) {

  591.         uint64_t gpos= avio_tell(pb);

  592.         ff_get_guid(pb, &g);

  593.         gsize = avio_rl64(pb);

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

  595.         print_guid(&g);

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

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

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

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

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

  601.                 asf->data_object_size = gsize - 24;

  602.             } else {

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

  604.             }

  605.             break;

  606.         }

  607.         if (gsize < 24)

  608.             return -1;

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

  610.             asf_read_file_properties(s, gsize);

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

  612.             asf_read_stream_properties(s, gsize);

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

  614.             asf_read_content_desc(s, gsize);

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

  616.             asf_read_language_list(s, gsize);

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

  618.             asf_read_ext_content_desc(s, gsize);

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

  620.             asf_read_metadata(s, gsize);

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

  622.             asf_read_ext_stream_properties(s, gsize);

  623. 

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

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

  626.             continue;

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

  628.             int v1, v2;

  629.             ff_get_guid(pb, &g);

  630.             v1 = avio_rl32(pb);

  631.             v2 = avio_rl16(pb);

  632.             continue;

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

  634.             asf_read_marker(s, gsize);

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

  636.             return -1;

  637.         } else {

  638.             if (!s->keylen) {

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

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

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

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

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

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

  645.                 }

  646.             }

  647.         }

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

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

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

  651.     }

  652.     ff_get_guid(pb, &g);

  653.     avio_rl64(pb);

  654.     avio_r8(pb);

  655.     avio_r8(pb);

  656.     if (url_feof(pb))

  657.         return -1;

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

  659.     asf->packet_size_left = 0;

  660. 

  661. 

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

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

  664.         if(stream_num>=0){

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

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

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

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

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

  670.                           &st->sample_aspect_ratio.den,

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

  672.             } 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.

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

  674.                           &st->sample_aspect_ratio.den,

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

  676. 

  677. //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);

  678. 

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

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

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

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

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

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

  685.                     if (iso6392)

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

  687.                 }

  688.             }

  689.         }

  690.     }

  691. 

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

  693. 

  694.     return 0;

  695. }

  696. 

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

  698.     switch (bits & 3) \

  699.     { \

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

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

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

  703.     default: var = defval; break; \

  704.     }

  705. 

  706. /**

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

  708.  * @param s demux context

  709.  * @param pb context to read data from

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

  711.  */

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

  713. {

  714.     ASFContext *asf = s->priv_data;

  715.     uint32_t packet_length, padsize;

  716.     int rsize = 8;

  717.     int c, d, e, off;

  718. 

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

  720.     off= 32768;

  721.     if (s->packet_size > 0)

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

  723. 

  724.     c=d=e=-1;

  725.     while(off-- > 0){

  726.         c=d; d=e;

  727.         e= avio_r8(pb);

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

  729.             break;

  730.     }

  731. 

  732.     if (c != 0x82) {

  733.         /**

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

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

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

  737.          * the stream.

  738.          */

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

  740.             return AVERROR(EAGAIN);

  741.         if (!url_feof(pb))

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

  743.     }

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

  745.         if (d || e) {

  746.             if (!url_feof(pb))

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

  748.             return -1;

  749.         }

  750.         c= avio_r8(pb);

  751.         d= avio_r8(pb);

  752.         rsize+=3;

  753.     }else{

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

  755.     }

  756. 

  757.     asf->packet_flags    = c;

  758.     asf->packet_property = d;

  759. 

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

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

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

  763. 

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

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

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

  767.         return -1;

  768.     }

  769.     if(padsize >= packet_length){

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

  771.         return -1;

  772.     }

  773. 

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

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

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

  777. 

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

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

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

  781.     } else {

  782.         asf->packet_segments = 1;

  783.         asf->packet_segsizetype = 0x80;

  784.     }

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

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

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

  788.     asf->packet_padsize = padsize;

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

  790.     return 0;

  791. }

  792. 

  793. /**

  794.  *

  795.  * @return <0 if error

  796.  */

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

  798.     ASFContext *asf = s->priv_data;

  799.     int rsize = 1;

  800.     int num = avio_r8(pb);

  801.     int64_t ts0, ts1;

  802. 

  803.     asf->packet_segments--;

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

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

  806.     // sequence should be ignored!

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

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

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

  810. //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);

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

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

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

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

  815.             return -1;

  816.         }

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

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

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

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

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

  822.             avio_skip(pb, 10);

  823.             ts0= avio_rl64(pb);

  824.             ts1= avio_rl64(pb);

  825.             avio_skip(pb, 12);

  826.             avio_rl32(pb);

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

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

  829.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  830.         }else

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

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

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

  834.         // multipacket - frag_offset is beginning timestamp

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

  836.         asf->packet_frag_offset = 0;

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

  838. 

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

  840.         rsize++;

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

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

  843.         return -1;

  844.     }

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

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

  847.         return -1;

  848.     }

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

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

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

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

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

  854.                 return -1;

  855.             } else {

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

  857.                 asf->packet_size_left += diff;

  858.                 asf->packet_padsize   -= diff;

  859.             }

  860.         }

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

  862.     } else {

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

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

  865.     }

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

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

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

  869.             return -1;

  870.     }

  871.     asf->packet_size_left -= rsize;

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

  873. 

  874.     return 0;

  875. }

  876. 

  877. /**

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

  879.  * with asf_get_packet()).

  880.  * @param s demux context

  881.  * @param pb context to read data from

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

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

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

  885.  */

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

  887. {

  888.     ASFContext *asf = s->priv_data;

  889.     ASFStream *asf_st = 0;

  890.     for (;;) {

  891.         int ret;

  892.         if(url_feof(pb))

  893.             return AVERROR_EOF;

  894.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  899.             assert(ret>=0);

  900.             /* fail safe */

  901.             avio_skip(pb, ret);

  902. 

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

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

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

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

  907.             return 1;

  908.         }

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

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

  911.                 asf->packet_segments= 0;

  912.                 continue;

  913.             }

  914.             if (asf->stream_index < 0

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

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

  917.                 ) {

  918.                 asf->packet_time_start = 0;

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

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

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

  922.                 if(asf->stream_index < 0)

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

  924.                 continue;

  925.             }

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

  927.         }

  928.         asf_st = asf->asf_st;

  929. 

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

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

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

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

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

  935.             asf->packet_size_left--;

  936.             asf->packet_multi_size--;

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

  938.             {

  939.                 asf->packet_time_start = 0;

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

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

  942.                 continue;

  943.             }

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

  945.             //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);

  946.         }

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

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

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

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

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

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

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

  954.         }

  955. 

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

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

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

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

  960.                 asf_st->frag_offset = 0;

  961.                 av_free_packet(&asf_st->pkt);

  962.             }

  963.             /* new packet */

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

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

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

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

  968.             asf_st->pkt.pos =

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

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

  971.                 uint8_t *pal;

  972.                 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE,

  973.                                               AVPALETTE_SIZE);

  974.                 if (!pal) {

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

  976.                 } else {

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

  978.                     asf_st->palette_changed = 0;

  979.                 }

  980.             }

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

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

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

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

  985.                 asf->packet_key_frame = 1;

  986.             if (asf->packet_key_frame)

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

  988.         }

  989. 

  990.         /* read data */

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

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

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

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

  995.         if (asf->packet_size_left < 0)

  996.             continue;

  997. 

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

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

  1000.             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",

  1001.                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);

  1002.             continue;

  1003.         }

  1004. 

  1005.         ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,

  1006.                          asf->packet_frag_size);

  1007.         if (ret != asf->packet_frag_size) {

  1008.             if (ret < 0 || asf->packet_frag_offset + ret == 0)

  1009.                 return ret < 0 ? ret : AVERROR_EOF;

  1010.             if (asf_st->ds_span > 1) {

  1011.                 // scrambling, we can either drop it completely or fill the remainder

  1012.                 // TODO: should we fill the whole packet instead of just the current

  1013.                 // fragment?

  1014.                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,

  1015.                        asf->packet_frag_size - ret);

  1016.                 ret = asf->packet_frag_size;

  1017.             } else

  1018.                 // no scrambling, so we can return partial packets

  1019.                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);

  1020.         }

  1021.         if (s->key && s->keylen == 20)

  1022.             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,

  1023.                             ret);

  1024.         asf_st->frag_offset += ret;

  1025.         /* test if whole packet is read */

  1026.         if (asf_st->frag_offset == asf_st->pkt.size) {

  1027.             //workaround for macroshit radio DVR-MS files

  1028.             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO

  1029.                && asf_st->pkt.size > 100){

  1030.                 int i;

  1031.                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);

  1032.                 if(i == asf_st->pkt.size){

  1033.                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");

  1034.                     asf_st->frag_offset = 0;

  1035.                     av_free_packet(&asf_st->pkt);

  1036.                     continue;

  1037.                 }

  1038.             }

  1039. 

  1040.             /* return packet */

  1041.             if (asf_st->ds_span > 1) {

  1042.               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){

  1043.                     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);

  1044.               }else{

  1045.                 /* packet descrambling */

  1046.                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);

  1047.                 if (newdata) {

  1048.                     int offset = 0;

  1049.                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

  1050.                     while (offset < asf_st->pkt.size) {

  1051.                         int off = offset / asf_st->ds_chunk_size;

  1052.                         int row = off / asf_st->ds_span;

  1053.                         int col = off % asf_st->ds_span;

  1054.                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;

  1055.                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);

  1056. 

  1057.                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);

  1058.                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);

  1059.                         memcpy(newdata + offset,

  1060.                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,

  1061.                                asf_st->ds_chunk_size);

  1062.                         offset += asf_st->ds_chunk_size;

  1063.                     }

  1064.                     av_free(asf_st->pkt.data);

  1065.                     asf_st->pkt.data = newdata;

  1066.                 }

  1067.               }

  1068.             }

  1069.             asf_st->frag_offset = 0;

  1070.             *pkt= asf_st->pkt;

  1071.             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);

  1072.             asf_st->pkt.size = 0;

  1073.             asf_st->pkt.data = 0;

  1074.             break; // packet completed

  1075.         }

  1076.     }

  1077.     return 0;

  1078. }

  1079. 

  1080. static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)

  1081. {

  1082.     ASFContext *asf = s->priv_data;

  1083. 

  1084.     for (;;) {

  1085.         int ret;

  1086. 

  1087.         /* parse cached packets, if any */

  1088.         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)

  1089.             return ret;

  1090.         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)

  1091.             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);

  1092.         asf->packet_time_start = 0;

  1093.     }

  1094. 

  1095.     return 0;

  1096. }

  1097. 

  1098. // Added to support seeking after packets have been read

  1099. // If information is not reset, read_packet fails due to

  1100. // leftover information from previous reads

  1101. static void asf_reset_header(AVFormatContext *s)

  1102. {

  1103.     ASFContext *asf = s->priv_data;

  1104.     ASFStream *asf_st;

  1105.     int i;

  1106. 

  1107.     asf->packet_size_left = 0;

  1108.     asf->packet_segments = 0;

  1109.     asf->packet_flags = 0;

  1110.     asf->packet_property = 0;

  1111.     asf->packet_timestamp = 0;

  1112.     asf->packet_segsizetype = 0;

  1113.     asf->packet_segments = 0;

  1114.     asf->packet_seq = 0;

  1115.     asf->packet_replic_size = 0;

  1116.     asf->packet_key_frame = 0;

  1117.     asf->packet_padsize = 0;

  1118.     asf->packet_frag_offset = 0;

  1119.     asf->packet_frag_size = 0;

  1120.     asf->packet_frag_timestamp = 0;

  1121.     asf->packet_multi_size = 0;

  1122.     asf->packet_obj_size = 0;

  1123.     asf->packet_time_delta = 0;

  1124.     asf->packet_time_start = 0;

  1125. 

  1126.     for(i=0; i<s->nb_streams; i++){

  1127.         asf_st= s->streams[i]->priv_data;

  1128.         av_free_packet(&asf_st->pkt);

  1129.         asf_st->frag_offset=0;

  1130.         asf_st->seq=0;

  1131.     }

  1132.     asf->asf_st= NULL;

  1133. }

  1134. 

  1135. static int asf_read_close(AVFormatContext *s)

  1136. {

  1137.     asf_reset_header(s);

  1138. 

  1139.     return 0;

  1140. }

  1141. 

  1142. static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

  1143. {

  1144.     AVPacket pkt1, *pkt = &pkt1;

  1145.     ASFStream *asf_st;

  1146.     int64_t pts;

  1147.     int64_t pos= *ppos;

  1148.     int i;

  1149.     int64_t start_pos[ASF_MAX_STREAMS];

  1150. 

  1151.     for(i=0; i<s->nb_streams; i++){

  1152.         start_pos[i]= pos;

  1153.     }

  1154. 

  1155.     if (s->packet_size > 0)

  1156.         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;

  1157.     *ppos= pos;

  1158.     avio_seek(s->pb, pos, SEEK_SET);

  1159. 

  1160. //printf("asf_read_pts\n");

  1161.     asf_reset_header(s);

  1162.     for(;;){

  1163.         if (av_read_frame(s, pkt) < 0){

  1164.             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");

  1165.             return AV_NOPTS_VALUE;

  1166.         }

  1167. 

  1168.         pts= pkt->pts;

  1169. 

  1170.         av_free_packet(pkt);

  1171.         if(pkt->flags&AV_PKT_FLAG_KEY){

  1172.             i= pkt->stream_index;

  1173. 

  1174.             asf_st= s->streams[i]->priv_data;

  1175. 

  1176. //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);

  1177.             pos= asf_st->packet_pos;

  1178. 

  1179.             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);

  1180.             start_pos[i]= asf_st->packet_pos + 1;

  1181. 

  1182.             if(pkt->stream_index == stream_index)

  1183.                break;

  1184.         }

  1185.     }

  1186. 

  1187.     *ppos= pos;

  1188. //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);

  1189. 

  1190.     return pts;

  1191. }

  1192. 

  1193. static void asf_build_simple_index(AVFormatContext *s, int stream_index)

  1194. {

  1195.     ff_asf_guid g;

  1196.     ASFContext *asf = s->priv_data;

  1197.     int64_t current_pos= avio_tell(s->pb);

  1198.     int i;

  1199. 

  1200.     avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);

  1201.     ff_get_guid(s->pb, &g);

  1202. 

  1203.     /* the data object can be followed by other top-level objects,

  1204.        skip them until the simple index object is reached */

  1205.     while (ff_guidcmp(&g, &index_guid)) {

  1206.         int64_t gsize= avio_rl64(s->pb);

  1207.         if (gsize < 24 || url_feof(s->pb)) {

  1208.             avio_seek(s->pb, current_pos, SEEK_SET);

  1209.             return;

  1210.         }

  1211.         avio_skip(s->pb, gsize-24);

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

  1213.     }

  1214. 

  1215.     {

  1216.         int64_t itime, last_pos=-1;

  1217.         int pct, ict;

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

  1219.         ff_get_guid(s->pb, &g);

  1220.         itime=avio_rl64(s->pb);

  1221.         pct=avio_rl32(s->pb);

  1222.         ict=avio_rl32(s->pb);

  1223.         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);

  1224. 

  1225.         for (i=0;i<ict;i++){

  1226.             int pktnum=avio_rl32(s->pb);

  1227.             int pktct =avio_rl16(s->pb);

  1228.             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;

  1229.             int64_t index_pts= FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);

  1230. 

  1231.             if(pos != last_pos){

  1232.             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d  pts: %"PRId64"\n", pktnum, pktct, index_pts);

  1233.             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);

  1234.             last_pos=pos;

  1235.             }

  1236.         }

  1237.         asf->index_read= 1;

  1238.     }

  1239.     avio_seek(s->pb, current_pos, SEEK_SET);

  1240. }

  1241. 

  1242. static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)

  1243. {

  1244.     ASFContext *asf = s->priv_data;

  1245.     AVStream *st = s->streams[stream_index];

  1246.     int64_t pos;

  1247.     int index;

  1248. 

  1249.     if (s->packet_size <= 0)

  1250.         return -1;

  1251. 

  1252.     /* Try using the protocol's read_seek if available */

  1253.     if(s->pb) {

  1254.         int ret = avio_seek_time(s->pb, stream_index, pts, flags);

  1255.         if(ret >= 0)

  1256.             asf_reset_header(s);

  1257.         if (ret != AVERROR(ENOSYS))

  1258.             return ret;

  1259.     }

  1260. 

  1261.     if (!asf->index_read)

  1262.         asf_build_simple_index(s, stream_index);

  1263. 

  1264.     if(!(asf->index_read && st->index_entries)){

  1265.         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)

  1266.             return -1;

  1267.     }else{

  1268.         index= av_index_search_timestamp(st, pts, flags);

  1269.         if(index<0)

  1270.             return -1;

  1271. 

  1272.         /* find the position */

  1273.         pos = st->index_entries[index].pos;

  1274. 

  1275.         /* do the seek */

  1276.         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1277.         avio_seek(s->pb, pos, SEEK_SET);

  1278.     }

  1279.     asf_reset_header(s);

  1280.     return 0;

  1281. }

  1282. 

  1283. AVInputFormat ff_asf_demuxer = {

  1284.     "asf",

  1285.     NULL_IF_CONFIG_SMALL("ASF format"),

  1286.     sizeof(ASFContext),

  1287.     asf_probe,

  1288.     asf_read_header,

  1289.     asf_read_packet,

  1290.     asf_read_close,

  1291.     asf_read_seek,

  1292.     asf_read_pts,

  1293. };