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FFmpeg/libavformat/asf.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. #include "avformat.h"

  22. #include "riff.h"

  23. #include "mpegaudio.h"

  24. #include "asf.h"

  25. #include "common.h"

  26. 

  27. #undef NDEBUG

  28. #include <assert.h>

  29. 

  30. #define FRAME_HEADER_SIZE 17

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

  32. 

  33. static const GUID index_guid = {

  34.     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb

  35. };

  36. 

  37. static const GUID stream_bitrate_guid = { /* (http://get.to/sdp) */

  38.     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2

  39. };

  40. /**********************************/

  41. /* decoding */

  42. 

  43. //#define DEBUG

  44. 

  45. #ifdef DEBUG

  46. #define PRINT_IF_GUID(g,cmp) \

  47. if (!memcmp(g, &cmp, sizeof(GUID))) \

  48.     printf("(GUID: %s) ", #cmp)

  49. 

  50. static void print_guid(const GUID *g)

  51. {

  52.     int i;

  53.     PRINT_IF_GUID(g, asf_header);

  54.     else PRINT_IF_GUID(g, file_header);

  55.     else PRINT_IF_GUID(g, stream_header);

  56.     else PRINT_IF_GUID(g, audio_stream);

  57.     else PRINT_IF_GUID(g, audio_conceal_none);

  58.     else PRINT_IF_GUID(g, video_stream);

  59.     else PRINT_IF_GUID(g, video_conceal_none);

  60.     else PRINT_IF_GUID(g, command_stream);

  61.     else PRINT_IF_GUID(g, comment_header);

  62.     else PRINT_IF_GUID(g, codec_comment_header);

  63.     else PRINT_IF_GUID(g, codec_comment1_header);

  64.     else PRINT_IF_GUID(g, data_header);

  65.     else PRINT_IF_GUID(g, index_guid);

  66.     else PRINT_IF_GUID(g, head1_guid);

  67.     else PRINT_IF_GUID(g, head2_guid);

  68.     else PRINT_IF_GUID(g, my_guid);

  69.     else PRINT_IF_GUID(g, ext_stream_header);

  70.     else PRINT_IF_GUID(g, extended_content_header);

  71.     else PRINT_IF_GUID(g, ext_stream_embed_stream_header);

  72.     else PRINT_IF_GUID(g, ext_stream_audio_stream);

  73.     else PRINT_IF_GUID(g, metadata_header);

  74.     else PRINT_IF_GUID(g, stream_bitrate_guid);

  75.     else

  76.         printf("(GUID: unknown) ");

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

  78.         printf(" 0x%02x,", (*g)[i]);

  79.     printf("}\n");

  80. }

  81. #undef PRINT_IF_GUID

  82. #endif

  83. 

  84. static void get_guid(ByteIOContext *s, GUID *g)

  85. {

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

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

  88. }

  89. 

  90. #if 0

  91. static void get_str16(ByteIOContext *pb, char *buf, int buf_size)

  92. {

  93.     int len, c;

  94.     char *q;

  95. 

  96.     len = get_le16(pb);

  97.     q = buf;

  98.     while (len > 0) {

  99.         c = get_le16(pb);

  100.         if ((q - buf) < buf_size - 1)

  101.             *q++ = c;

  102.         len--;

  103.     }

  104.     *q = '\0';

  105. }

  106. #endif

  107. 

  108. static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)

  109. {

  110.     char* q = buf;

  111.     len /= 2;

  112.     while (len--) {

  113.         uint8_t tmp;

  114.         PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)

  115.     }

  116.     *q = '\0';

  117. }

  118. 

  119. static int asf_probe(AVProbeData *pd)

  120. {

  121.     /* check file header */

  122.     if (pd->buf_size <= 32)

  123.         return 0;

  124. 

  125.     if (!memcmp(pd->buf, &asf_header, sizeof(GUID)))

  126.         return AVPROBE_SCORE_MAX;

  127.     else

  128.         return 0;

  129. }

  130. 

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

  132.     switch(type){

  133.         case 2: return get_le32(pb);

  134.         case 3: return get_le32(pb);

  135.         case 4: return get_le64(pb);

  136.         case 5: return get_le16(pb);

  137.         default:return INT_MIN;

  138.     }

  139. }

  140. 

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

  142. {

  143.     ASFContext *asf = s->priv_data;

  144.     GUID g;

  145.     ByteIOContext *pb = &s->pb;

  146.     AVStream *st;

  147.     ASFStream *asf_st;

  148.     int size, i;

  149.     int64_t gsize;

  150.     AVRational dar[128];

  151. 

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

  153. 

  154.     get_guid(pb, &g);

  155.     if (memcmp(&g, &asf_header, sizeof(GUID)))

  156.         goto fail;

  157.     get_le64(pb);

  158.     get_le32(pb);

  159.     get_byte(pb);

  160.     get_byte(pb);

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

  162.     for(;;) {

  163.         get_guid(pb, &g);

  164.         gsize = get_le64(pb);

  165. #ifdef DEBUG

  166.         printf("%08"PRIx64": ", url_ftell(pb) - 24);

  167.         print_guid(&g);

  168.         printf("  size=0x%"PRIx64"\n", gsize);

  169. #endif

  170.         if (!memcmp(&g, &data_header, sizeof(GUID))) {

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

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

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

  174.                 asf->data_object_size = gsize - 24;

  175.             } else {

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

  177.             }

  178.             break;

  179.         }

  180.         if (gsize < 24)

  181.             goto fail;

  182.         if (!memcmp(&g, &file_header, sizeof(GUID))) {

  183.             get_guid(pb, &asf->hdr.guid);

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

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

  186.             asf->nb_packets             = get_le64(pb);

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

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

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

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

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

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

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

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

  195.             asf->packet_size = asf->hdr.max_pktsize;

  196.         } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {

  197.             int type, type_specific_size, sizeX;

  198.             uint64_t total_size;

  199.             unsigned int tag1;

  200.             int64_t pos1, pos2;

  201.             int test_for_ext_stream_audio;

  202. 

  203.             pos1 = url_ftell(pb);

  204. 

  205.             st = av_new_stream(s, 0);

  206.             if (!st)

  207.                 goto fail;

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

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

  210.             if (!asf_st)

  211.                 goto fail;

  212.             st->priv_data = asf_st;

  213.             st->start_time = asf->hdr.preroll;

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

  215.                 st->duration = asf->hdr.send_time /

  216.                     (10000000 / 1000) - st->start_time;

  217.             }

  218.             get_guid(pb, &g);

  219. 

  220.             test_for_ext_stream_audio = 0;

  221.             if (!memcmp(&g, &audio_stream, sizeof(GUID))) {

  222.                 type = CODEC_TYPE_AUDIO;

  223.             } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {

  224.                 type = CODEC_TYPE_VIDEO;

  225.             } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {

  226.                 type = CODEC_TYPE_UNKNOWN;

  227.             } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {

  228.                 test_for_ext_stream_audio = 1;

  229.                 type = CODEC_TYPE_UNKNOWN;

  230.             } else {

  231.                 goto fail;

  232.             }

  233.             get_guid(pb, &g);

  234.             total_size = get_le64(pb);

  235.             type_specific_size = get_le32(pb);

  236.             get_le32(pb);

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

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

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

  240. 

  241.             get_le32(pb);

  242. 

  243.             if (test_for_ext_stream_audio) {

  244.                 get_guid(pb, &g);

  245.                 if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {

  246.                     type = CODEC_TYPE_AUDIO;

  247.                     get_guid(pb, &g);

  248.                     get_le32(pb);

  249.                     get_le32(pb);

  250.                     get_le32(pb);

  251.                     get_guid(pb, &g);

  252.                     get_le32(pb);

  253.                 }

  254.             }

  255. 

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

  257.             if (type == CODEC_TYPE_AUDIO) {

  258.                 get_wav_header(pb, st->codec, type_specific_size);

  259.                 st->need_parsing = 1;

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

  261.                 pos2 = url_ftell(pb);

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

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

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

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

  266.                     get_le16(pb); //ds_data_size

  267.                     get_byte(pb); //ds_silence_data

  268.                 }

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

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

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

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

  273.                     if (!asf_st->ds_chunk_size

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

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

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

  277.                 }

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

  279.                 case CODEC_ID_MP3:

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

  281.                     break;

  282.                 case CODEC_ID_PCM_S16LE:

  283.                 case CODEC_ID_PCM_S16BE:

  284.                 case CODEC_ID_PCM_U16LE:

  285.                 case CODEC_ID_PCM_U16BE:

  286.                 case CODEC_ID_PCM_S8:

  287.                 case CODEC_ID_PCM_U8:

  288.                 case CODEC_ID_PCM_ALAW:

  289.                 case CODEC_ID_PCM_MULAW:

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

  291.                     break;

  292.                 default:

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

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

  295.                     break;

  296.                 }

  297.             } else if (type == CODEC_TYPE_VIDEO) {

  298.                 get_le32(pb);

  299.                 get_le32(pb);

  300.                 get_byte(pb);

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

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

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

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

  305.                 /* not available for asf */

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

  307.                 st->codec->bits_per_sample = get_le16(pb); /* depth */

  308.                 tag1 = get_le32(pb);

  309.                 url_fskip(pb, 20);

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

  311.                 size= sizeX;

  312.                 if (size > 40) {

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

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

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

  316.                 }

  317. 

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

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

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

  321.         if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {

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

  323. #ifdef WORDS_BIGENDIAN

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

  325.                 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);

  326. #else

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

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

  329. #endif

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

  331.         }

  332. 

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

  334.                 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);

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

  336.                     st->need_parsing = 1;

  337.             }

  338.             pos2 = url_ftell(pb);

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

  340.         } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {

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

  342. 

  343.             len1 = get_le16(pb);

  344.             len2 = get_le16(pb);

  345.             len3 = get_le16(pb);

  346.             len4 = get_le16(pb);

  347.             len5 = get_le16(pb);

  348.             get_str16_nolen(pb, len1, s->title    , sizeof(s->title));

  349.             get_str16_nolen(pb, len2, s->author   , sizeof(s->author));

  350.             get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));

  351.             get_str16_nolen(pb, len4, s->comment  , sizeof(s->comment));

  352.             url_fskip(pb, len5);

  353.         } else if (!memcmp(&g, &stream_bitrate_guid, sizeof(GUID))) {

  354.             int stream_count = get_le16(pb);

  355.             int j;

  356. 

  357. //            av_log(NULL, AV_LOG_ERROR, "stream bitrate properties\n");

  358. //            av_log(NULL, AV_LOG_ERROR, "streams %d\n", streams);

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

  360.                 int flags, bitrate, stream_id;

  361. 

  362.                 flags= get_le16(pb);

  363.                 bitrate= get_le32(pb);

  364.                 stream_id= (flags & 0x7f);

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

  366.                 asf->stream_bitrates[stream_id-1]= bitrate;

  367.             }

  368.        } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {

  369.                 int desc_count, i;

  370. 

  371.                 desc_count = get_le16(pb);

  372.                 for(i=0;i<desc_count;i++)

  373.                 {

  374.                         int name_len,value_type,value_len;

  375.                         uint64_t value_num = 0;

  376.                         char name[1024];

  377. 

  378.                         name_len = get_le16(pb);

  379.                         get_str16_nolen(pb, name_len, name, sizeof(name));

  380.                         value_type = get_le16(pb);

  381.                         value_len = get_le16(pb);

  382.                         if ((value_type == 0) || (value_type == 1)) // unicode or byte

  383.                         {

  384.                                 if     (!strcmp(name,"WM/AlbumTitle")) get_str16_nolen(pb, value_len, s->album, sizeof(s->album));

  385.                                 else if(!strcmp(name,"WM/Genre"     )) get_str16_nolen(pb, value_len, s->genre, sizeof(s->genre));

  386.                                 else url_fskip(pb, value_len);

  387.                         }

  388.                         if ((value_type >= 2) && (value_type <= 5)) // boolean or DWORD or QWORD or WORD

  389.                         {

  390.                                 value_num= get_value(pb, value_type);

  391.                                 if (!strcmp(name,"WM/Track"      )) s->track = value_num + 1;

  392.                                 if (!strcmp(name,"WM/TrackNumber")) s->track = value_num;

  393.                         }

  394.                 }

  395.         } else if (!memcmp(&g, &metadata_header, sizeof(GUID))) {

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

  397.             n = get_le16(pb);

  398. 

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

  400.                 char name[1024];

  401. 

  402.                 get_le16(pb); //lang_list_index

  403.                 stream_num= get_le16(pb);

  404.                 name_len=   get_le16(pb);

  405.                 value_type= get_le16(pb);

  406.                 value_len=  get_le32(pb);

  407. 

  408.                 get_str16_nolen(pb, name_len, name, sizeof(name));

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

  410.                 value_num= get_le16(pb);//we should use get_value() here but it doesnt work 2 is le16 here but le32 elsewhere

  411.                 url_fskip(pb, value_len - 2);

  412. 

  413.                 if(stream_num<128){

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

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

  416.                 }

  417.             }

  418.         } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {

  419.             int ext_len, payload_ext_ct, stream_ct;

  420.             uint32_t ext_d;

  421.             int64_t pos_ex_st;

  422.             pos_ex_st = url_ftell(pb);

  423. 

  424.             get_le64(pb); // starttime

  425.             get_le64(pb); // endtime

  426.             get_le32(pb); // leak-datarate

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

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

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

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

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

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

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

  434.             get_le16(pb); // stream-num

  435.             get_le16(pb); // stream-language-id-index

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

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

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

  439. 

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

  441.                 get_le16(pb);

  442.                 ext_len = get_le16(pb);

  443.                 url_fseek(pb, ext_len, SEEK_CUR);

  444.             }

  445. 

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

  447.                 get_guid(pb, &g);

  448.                 ext_d=get_le16(pb);

  449.                 ext_len=get_le32(pb);

  450.                 url_fseek(pb, ext_len, SEEK_CUR);

  451.             }

  452. 

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

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

  455.         } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {

  456.             int v1, v2;

  457.             get_guid(pb, &g);

  458.             v1 = get_le32(pb);

  459.             v2 = get_le16(pb);

  460. #if 0

  461.         } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {

  462.             int len, v1, n, num;

  463.             char str[256], *q;

  464.             char tag[16];

  465. 

  466.             get_guid(pb, &g);

  467.             print_guid(&g);

  468. 

  469.             n = get_le32(pb);

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

  471.                 num = get_le16(pb); /* stream number */

  472.                 get_str16(pb, str, sizeof(str));

  473.                 get_str16(pb, str, sizeof(str));

  474.                 len = get_le16(pb);

  475.                 q = tag;

  476.                 while (len > 0) {

  477.                     v1 = get_byte(pb);

  478.                     if ((q - tag) < sizeof(tag) - 1)

  479.                         *q++ = v1;

  480.                     len--;

  481.                 }

  482.                 *q = '\0';

  483.             }

  484. #endif

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

  486.             goto fail;

  487.         } else {

  488.             url_fseek(pb, gsize - 24, SEEK_CUR);

  489.         }

  490.     }

  491.     get_guid(pb, &g);

  492.     get_le64(pb);

  493.     get_byte(pb);

  494.     get_byte(pb);

  495.     if (url_feof(pb))

  496.         goto fail;

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

  498.     asf->packet_size_left = 0;

  499. 

  500. 

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

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

  503.         if(stream_num>=0 && dar[i].num>0 && dar[i].den>0){

  504.             AVCodecContext *codec= s->streams[stream_num]->codec;

  505.             av_reduce(&codec->sample_aspect_ratio.num,

  506.                     &codec->sample_aspect_ratio.den,

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

  508. //av_log(NULL, AV_LOG_ERROR, "dar %d:%d sar=%d:%d\n", dar[i].num, dar[i].den, codec->sample_aspect_ratio.num, codec->sample_aspect_ratio.den);

  509.         }

  510.     }

  511. 

  512.     return 0;

  513. 

  514.  fail:

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

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

  517.         if (st) {

  518.             av_free(st->priv_data);

  519.             av_free(st->codec->extradata);

  520.         }

  521.         av_free(st);

  522.     }

  523.     return -1;

  524. }

  525. 

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

  527.     switch (bits & 3) \

  528.     { \

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

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

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

  532.     default: var = defval; break; \

  533.     }

  534. 

  535. /**

  536.  *

  537.  * @return <0 in case of an error

  538.  */

  539. static int asf_get_packet(AVFormatContext *s)

  540. {

  541.     ASFContext *asf = s->priv_data;

  542.     ByteIOContext *pb = &s->pb;

  543.     uint32_t packet_length, padsize;

  544.     int rsize = 9;

  545.     int c, d, e, off;

  546. 

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

  548. 

  549.     c=d=e=-1;

  550.     while(off-- > 0){

  551.         c=d; d=e;

  552.         e= get_byte(pb);

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

  554.             break;

  555.     }

  556. 

  557.     if (c != 0x82) {

  558.         if (!url_feof(pb))

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

  560.     }

  561.     if ((c & 0x0f) == 2) { // always true for now

  562.         if (d || e) {

  563.             if (!url_feof(pb))

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

  565.             return -1;

  566.         }

  567.         d= get_byte(pb);

  568.         e= get_byte(pb);

  569.         rsize+=2;

  570. /*    }else{

  571.         if (!url_feof(pb))

  572.             printf("ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));

  573.         return AVERROR_IO;*/

  574.     }

  575. 

  576.     asf->packet_flags = d;

  577.     asf->packet_property = e;

  578. 

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

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

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

  582. 

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

  584.     if(packet_length >= (1U<<29)){

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

  586.         return -1;

  587.     }

  588.     if(padsize >= packet_length){

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

  590.         return -1;

  591.     }

  592. 

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

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

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

  596. 

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

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

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

  600.     } else {

  601.         asf->packet_segments = 1;

  602.         asf->packet_segsizetype = 0x80;

  603.     }

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

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

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

  607.     asf->packet_padsize = padsize;

  608. #ifdef DEBUG

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

  610. #endif

  611.     return 0;

  612. }

  613. 

  614. /**

  615.  *

  616.  * @return <0 if error

  617.  */

  618. static int asf_read_frame_header(AVFormatContext *s){

  619.     ASFContext *asf = s->priv_data;

  620.     ByteIOContext *pb = &s->pb;

  621.     int rsize = 1;

  622.     int num = get_byte(pb);

  623.     int64_t ts0, ts1;

  624. 

  625.     asf->packet_segments--;

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

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

  628.     // sequence should be ignored!

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

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

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

  632. //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);

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

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

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

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

  637.             return -1;

  638.         }

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

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

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

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

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

  644.             url_fskip(pb, 10);

  645.             ts0= get_le64(pb);

  646.             ts1= get_le64(pb);

  647.             url_fskip(pb, 12);

  648.             get_le32(pb);

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

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

  651.             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;

  652.         }else

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

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

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

  656.         // multipacket - frag_offset is begining timestamp

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

  658.         asf->packet_frag_offset = 0;

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

  660. 

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

  662.         rsize++;

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

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

  665.         return -1;

  666.     }

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

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

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

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

  671.             return -1;

  672.         }

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

  674.     } else {

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

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

  677.     }

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

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

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

  681.             return -1;

  682.     }

  683.     asf->packet_size_left -= rsize;

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

  685. 

  686.     return 0;

  687. }

  688. 

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

  690. {

  691.     ASFContext *asf = s->priv_data;

  692.     ASFStream *asf_st = 0;

  693.     ByteIOContext *pb = &s->pb;

  694.     //static int pc = 0;

  695.     for (;;) {

  696.         if(url_feof(pb))

  697.             return AVERROR_IO;

  698.         if (asf->packet_size_left < FRAME_HEADER_SIZE

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

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

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

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

  703.             assert(ret>=0);

  704.             /* fail safe */

  705.             url_fskip(pb, ret);

  706. 

  707.             asf->packet_pos= url_ftell(&s->pb);

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

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

  710.                 return AVERROR_IO; /* Do not exceed the size of the data object */

  711.             ret = asf_get_packet(s);

  712.             //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);

  713.             if (ret < 0)

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

  715.             asf->packet_time_start = 0;

  716.             continue;

  717.         }

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

  719.             if(asf_read_frame_header(s) < 0){

  720.                 asf->packet_segments= 0;

  721.                 continue;

  722.             }

  723.             if (asf->stream_index < 0

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

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

  726.                 ) {

  727.                 asf->packet_time_start = 0;

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

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

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

  731.                 if(asf->stream_index < 0)

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

  733.                 continue;

  734.             }

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

  736.         }

  737.         asf_st = asf->asf_st;

  738. 

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

  740.             // frag_offset is here used as the begining timestamp

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

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

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

  744.             asf->packet_size_left--;

  745.             asf->packet_multi_size--;

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

  747.             {

  748.                 asf->packet_time_start = 0;

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

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

  751.                 continue;

  752.             }

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

  754.             //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);

  755.         }

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

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

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

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

  760.                 asf_st->frag_offset = 0;

  761.                 av_free_packet(&asf_st->pkt);

  762.             }

  763.             /* new packet */

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

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

  766.             asf_st->pkt.pts = asf->packet_frag_timestamp;

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

  768.             asf_st->pkt.pos =

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

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

  771. //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,

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

  773.             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)

  774.                 asf->packet_key_frame = 1;

  775.             if (asf->packet_key_frame)

  776.                 asf_st->pkt.flags |= PKT_FLAG_KEY;

  777.         }

  778. 

  779.         /* read data */

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

  781.         //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,

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

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

  784.         if (asf->packet_size_left < 0)

  785.             continue;

  786. 

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

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

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

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

  791.             continue;

  792.         }

  793. 

  794.         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,

  795.                    asf->packet_frag_size);

  796.         asf_st->frag_offset += asf->packet_frag_size;

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

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

  799.             /* return packet */

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

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

  802.                     av_log(s, AV_LOG_ERROR, "pkt.size != ds_packet_size * ds_span\n");

  803.               }else{

  804.                 /* packet descrambling */

  805.                 uint8_t *newdata = av_malloc(asf_st->pkt.size);

  806.                 if (newdata) {

  807.                     int offset = 0;

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

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

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

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

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

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

  814. 

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

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

  817.                         memcpy(newdata + offset,

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

  819.                                asf_st->ds_chunk_size);

  820.                         offset += asf_st->ds_chunk_size;

  821.                     }

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

  823.                     asf_st->pkt.data = newdata;

  824.                 }

  825.               }

  826.             }

  827.             asf_st->frag_offset = 0;

  828.             *pkt= asf_st->pkt;

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

  830.             asf_st->pkt.size = 0;

  831.             asf_st->pkt.data = 0;

  832.             break; // packet completed

  833.         }

  834.     }

  835.     return 0;

  836. }

  837. 

  838. static int asf_read_close(AVFormatContext *s)

  839. {

  840.     int i;

  841. 

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

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

  844.         av_free(st->priv_data);

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

  846.     }

  847.     return 0;

  848. }

  849. 

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

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

  852. // leftover information from previous reads

  853. static void asf_reset_header(AVFormatContext *s)

  854. {

  855.     ASFContext *asf = s->priv_data;

  856.     ASFStream *asf_st;

  857.     int i;

  858. 

  859.     asf->packet_nb_frames = 0;

  860.     asf->packet_size_left = 0;

  861.     asf->packet_segments = 0;

  862.     asf->packet_flags = 0;

  863.     asf->packet_property = 0;

  864.     asf->packet_timestamp = 0;

  865.     asf->packet_segsizetype = 0;

  866.     asf->packet_segments = 0;

  867.     asf->packet_seq = 0;

  868.     asf->packet_replic_size = 0;

  869.     asf->packet_key_frame = 0;

  870.     asf->packet_padsize = 0;

  871.     asf->packet_frag_offset = 0;

  872.     asf->packet_frag_size = 0;

  873.     asf->packet_frag_timestamp = 0;

  874.     asf->packet_multi_size = 0;

  875.     asf->packet_obj_size = 0;

  876.     asf->packet_time_delta = 0;

  877.     asf->packet_time_start = 0;

  878. 

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

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

  881.         av_free_packet(&asf_st->pkt);

  882.         asf_st->frag_offset=0;

  883.         asf_st->seq=0;

  884.     }

  885.     asf->asf_st= NULL;

  886. }

  887. 

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

  889. {

  890.     ASFContext *asf = s->priv_data;

  891.     AVPacket pkt1, *pkt = &pkt1;

  892.     ASFStream *asf_st;

  893.     int64_t pts;

  894.     int64_t pos= *ppos;

  895.     int i;

  896.     int64_t start_pos[s->nb_streams];

  897. 

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

  899.         start_pos[i]= pos;

  900.     }

  901. 

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

  903.     *ppos= pos;

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

  905. 

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

  907.     asf_reset_header(s);

  908.     for(;;){

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

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

  911.             return AV_NOPTS_VALUE;

  912.         }

  913. 

  914.         pts= pkt->pts;

  915. 

  916.         av_free_packet(pkt);

  917.         if(pkt->flags&PKT_FLAG_KEY){

  918.             i= pkt->stream_index;

  919. 

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

  921. 

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

  923.             pos= asf_st->packet_pos;

  924. 

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

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

  927. 

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

  929.                break;

  930.         }

  931.     }

  932. 

  933.     *ppos= pos;

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

  935. 

  936.     return pts;

  937. }

  938. 

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

  940. {

  941.     GUID g;

  942.     ASFContext *asf = s->priv_data;

  943.     int64_t gsize, itime;

  944.     int64_t pos, current_pos, index_pts;

  945.     int i;

  946.     int pct,ict;

  947. 

  948.     current_pos = url_ftell(&s->pb);

  949. 

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

  951.     get_guid(&s->pb, &g);

  952.     if (!memcmp(&g, &index_guid, sizeof(GUID))) {

  953.         gsize = get_le64(&s->pb);

  954.         get_guid(&s->pb, &g);

  955.         itime=get_le64(&s->pb);

  956.         pct=get_le32(&s->pb);

  957.         ict=get_le32(&s->pb);

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

  959. 

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

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

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

  963.             av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);

  964. 

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

  966.             index_pts=av_rescale(itime, i, 10000);

  967. 

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

  969.         }

  970.         asf->index_read= 1;

  971.     }

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

  973. }

  974. 

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

  976. {

  977.     ASFContext *asf = s->priv_data;

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

  979.     int64_t pos;

  980.     int index;

  981. 

  982.     if (asf->packet_size <= 0)

  983.         return -1;

  984. 

  985.     if (!asf->index_read)

  986.         asf_build_simple_index(s, stream_index);

  987. 

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

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

  990.             return -1;

  991.     }else{

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

  993.         if(index<0)

  994.             return -1;

  995. 

  996.         /* find the position */

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

  998.         pts = st->index_entries[index].timestamp;

  999. 

  1000.     // various attempts to find key frame have failed so far

  1001.     //    asf_reset_header(s);

  1002.     //    url_fseek(&s->pb, pos, SEEK_SET);

  1003.     //    key_pos = pos;

  1004.     //     for(i=0;i<16;i++){

  1005.     //         pos = url_ftell(&s->pb);

  1006.     //         if (av_read_frame(s, &pkt) < 0){

  1007.     //             av_log(s, AV_LOG_INFO, "seek failed\n");

  1008.     //             return -1;

  1009.     //         }

  1010.     //         asf_st = s->streams[stream_index]->priv_data;

  1011.     //         pos += st->parser->frame_offset;

  1012.     //

  1013.     //         if (pkt.size > b) {

  1014.     //             b = pkt.size;

  1015.     //             key_pos = pos;

  1016.     //         }

  1017.     //

  1018.     //         av_free_packet(&pkt);

  1019.     //     }

  1020. 

  1021.         /* do the seek */

  1022.         av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);

  1023.         url_fseek(&s->pb, pos, SEEK_SET);

  1024.     }

  1025.     asf_reset_header(s);

  1026.     return 0;

  1027. }

  1028. 

  1029. AVInputFormat asf_demuxer = {

  1030.     "asf",

  1031.     "asf format",

  1032.     sizeof(ASFContext),

  1033.     asf_probe,

  1034.     asf_read_header,

  1035.     asf_read_packet,

  1036.     asf_read_close,

  1037.     asf_read_seek,

  1038.     asf_read_pts,

  1039. };