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FFmpeg/libavformat/rmdec.c

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  1. /*

  2.  * "Real" compatible demuxer.

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

  4.  *

  5.  * This file is part of Libav.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. #include "libavutil/avstring.h"

  23. #include "libavutil/intreadwrite.h"

  24. #include "libavutil/dict.h"

  25. #include "avformat.h"

  26. #include "riff.h"

  27. #include "rm.h"

  28. 

  29. struct RMStream {

  30.     AVPacket pkt;      ///< place to store merged video frame / reordered audio data

  31.     int videobufsize;  ///< current assembled frame size

  32.     int videobufpos;   ///< position for the next slice in the video buffer

  33.     int curpic_num;    ///< picture number of current frame

  34.     int cur_slice, slices;

  35.     int64_t pktpos;    ///< first slice position in file

  36.     /// Audio descrambling matrix parameters

  37.     int64_t audiotimestamp; ///< Audio packet timestamp

  38.     int sub_packet_cnt; // Subpacket counter, used while reading

  39.     int sub_packet_size, sub_packet_h, coded_framesize; ///< Descrambling parameters from container

  40.     int audio_framesize; /// Audio frame size from container

  41.     int sub_packet_lengths[16]; /// Length of each subpacket

  42. };

  43. 

  44. typedef struct {

  45.     int nb_packets;

  46.     int old_format;

  47.     int current_stream;

  48.     int remaining_len;

  49.     int audio_stream_num; ///< Stream number for audio packets

  50.     int audio_pkt_cnt; ///< Output packet counter

  51. } RMDemuxContext;

  52. 

  53. static const unsigned char sipr_swaps[38][2] = {

  54.     {  0, 63 }, {  1, 22 }, {  2, 44 }, {  3, 90 },

  55.     {  5, 81 }, {  7, 31 }, {  8, 86 }, {  9, 58 },

  56.     { 10, 36 }, { 12, 68 }, { 13, 39 }, { 14, 73 },

  57.     { 15, 53 }, { 16, 69 }, { 17, 57 }, { 19, 88 },

  58.     { 20, 34 }, { 21, 71 }, { 24, 46 }, { 25, 94 },

  59.     { 26, 54 }, { 28, 75 }, { 29, 50 }, { 32, 70 },

  60.     { 33, 92 }, { 35, 74 }, { 38, 85 }, { 40, 56 },

  61.     { 42, 87 }, { 43, 65 }, { 45, 59 }, { 48, 79 },

  62.     { 49, 93 }, { 51, 89 }, { 55, 95 }, { 61, 76 },

  63.     { 67, 83 }, { 77, 80 }

  64. };

  65. 

  66. const unsigned char ff_sipr_subpk_size[4] = { 29, 19, 37, 20 };

  67. 

  68. static inline void get_strl(AVIOContext *pb, char *buf, int buf_size, int len)

  69. {

  70.     int i;

  71.     char *q, r;

  72. 

  73.     q = buf;

  74.     for(i=0;i<len;i++) {

  75.         r = avio_r8(pb);

  76.         if (i < buf_size - 1)

  77.             *q++ = r;

  78.     }

  79.     if (buf_size > 0) *q = '\0';

  80. }

  81. 

  82. static void get_str8(AVIOContext *pb, char *buf, int buf_size)

  83. {

  84.     get_strl(pb, buf, buf_size, avio_r8(pb));

  85. }

  86. 

  87. static int rm_read_extradata(AVIOContext *pb, AVCodecContext *avctx, unsigned size)

  88. {

  89.     if (size >= 1<<24)

  90.         return -1;

  91.     avctx->extradata = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);

  92.     if (!avctx->extradata)

  93.         return AVERROR(ENOMEM);

  94.     avctx->extradata_size = avio_read(pb, avctx->extradata, size);

  95.     memset(avctx->extradata + avctx->extradata_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

  96.     if (avctx->extradata_size != size)

  97.         return AVERROR(EIO);

  98.     return 0;

  99. }

  100. 

  101. static void rm_read_metadata(AVFormatContext *s, int wide)

  102. {

  103.     char buf[1024];

  104.     int i;

  105.     for (i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {

  106.         int len = wide ? avio_rb16(s->pb) : avio_r8(s->pb);

  107.         get_strl(s->pb, buf, sizeof(buf), len);

  108.         av_dict_set(&s->metadata, ff_rm_metadata[i], buf, 0);

  109.     }

  110. }

  111. 

  112. RMStream *ff_rm_alloc_rmstream (void)

  113. {

  114.     RMStream *rms = av_mallocz(sizeof(RMStream));

  115.     rms->curpic_num = -1;

  116.     return rms;

  117. }

  118. 

  119. void ff_rm_free_rmstream (RMStream *rms)

  120. {

  121.     av_free_packet(&rms->pkt);

  122. }

  123. 

  124. static int rm_read_audio_stream_info(AVFormatContext *s, AVIOContext *pb,

  125.                                      AVStream *st, RMStream *ast, int read_all)

  126. {

  127.     char buf[256];

  128.     uint32_t version;

  129.     int ret;

  130. 

  131.     /* ra type header */

  132.     version = avio_rb16(pb); /* version */

  133.     if (version == 3) {

  134.         int header_size = avio_rb16(pb);

  135.         int64_t startpos = avio_tell(pb);

  136.         avio_skip(pb, 14);

  137.         rm_read_metadata(s, 0);

  138.         if ((startpos + header_size) >= avio_tell(pb) + 2) {

  139.             // fourcc (should always be "lpcJ")

  140.             avio_r8(pb);

  141.             get_str8(pb, buf, sizeof(buf));

  142.         }

  143.         // Skip extra header crap (this should never happen)

  144.         if ((startpos + header_size) > avio_tell(pb))

  145.             avio_skip(pb, header_size + startpos - avio_tell(pb));

  146.         st->codec->sample_rate = 8000;

  147.         st->codec->channels = 1;

  148.         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

  149.         st->codec->codec_id = CODEC_ID_RA_144;

  150.     } else {

  151.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  152.         int codecdata_length;

  153.         /* old version (4) */

  154.         avio_skip(pb, 2); /* unused */

  155.         avio_rb32(pb); /* .ra4 */

  156.         avio_rb32(pb); /* data size */

  157.         avio_rb16(pb); /* version2 */

  158.         avio_rb32(pb); /* header size */

  159.         flavor= avio_rb16(pb); /* add codec info / flavor */

  160.         ast->coded_framesize = coded_framesize = avio_rb32(pb); /* coded frame size */

  161.         avio_rb32(pb); /* ??? */

  162.         avio_rb32(pb); /* ??? */

  163.         avio_rb32(pb); /* ??? */

  164.         ast->sub_packet_h = sub_packet_h = avio_rb16(pb); /* 1 */

  165.         st->codec->block_align= avio_rb16(pb); /* frame size */

  166.         ast->sub_packet_size = sub_packet_size = avio_rb16(pb); /* sub packet size */

  167.         avio_rb16(pb); /* ??? */

  168.         if (version == 5) {

  169.             avio_rb16(pb); avio_rb16(pb); avio_rb16(pb);

  170.         }

  171.         st->codec->sample_rate = avio_rb16(pb);

  172.         avio_rb32(pb);

  173.         st->codec->channels = avio_rb16(pb);

  174.         if (version == 5) {

  175.             avio_rb32(pb);

  176.             avio_read(pb, buf, 4);

  177.             buf[4] = 0;

  178.         } else {

  179.             get_str8(pb, buf, sizeof(buf)); /* desc */

  180.             get_str8(pb, buf, sizeof(buf)); /* desc */

  181.         }

  182.         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

  183.         st->codec->codec_tag  = AV_RL32(buf);

  184.         st->codec->codec_id   = ff_codec_get_id(ff_rm_codec_tags,

  185.                                                 st->codec->codec_tag);

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

  187.         case CODEC_ID_AC3:

  188.             st->need_parsing = AVSTREAM_PARSE_FULL;

  189.             break;

  190.         case CODEC_ID_RA_288:

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

  192.             ast->audio_framesize = st->codec->block_align;

  193.             st->codec->block_align = coded_framesize;

  194. 

  195.             if(ast->audio_framesize >= UINT_MAX / sub_packet_h){

  196.                 av_log(s, AV_LOG_ERROR, "ast->audio_framesize * sub_packet_h too large\n");

  197.                 return -1;

  198.             }

  199. 

  200.             av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h);

  201.             break;

  202.         case CODEC_ID_COOK:

  203.         case CODEC_ID_ATRAC3:

  204.         case CODEC_ID_SIPR:

  205.             avio_rb16(pb); avio_r8(pb);

  206.             if (version == 5)

  207.                 avio_r8(pb);

  208.             codecdata_length = avio_rb32(pb);

  209.             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){

  210.                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");

  211.                 return -1;

  212.             }

  213. 

  214.             ast->audio_framesize = st->codec->block_align;

  215.             if (st->codec->codec_id == CODEC_ID_SIPR) {

  216.                 if (flavor > 3) {

  217.                     av_log(s, AV_LOG_ERROR, "bad SIPR file flavor %d\n",

  218.                            flavor);

  219.                     return -1;

  220.                 }

  221.                 st->codec->block_align = ff_sipr_subpk_size[flavor];

  222.             } else {

  223.                 if(sub_packet_size <= 0){

  224.                     av_log(s, AV_LOG_ERROR, "sub_packet_size is invalid\n");

  225.                     return -1;

  226.                 }

  227.                 st->codec->block_align = ast->sub_packet_size;

  228.             }

  229.             if ((ret = rm_read_extradata(pb, st->codec, codecdata_length)) < 0)

  230.                 return ret;

  231. 

  232.             if(ast->audio_framesize >= UINT_MAX / sub_packet_h){

  233.                 av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");

  234.                 return -1;

  235.             }

  236. 

  237.             av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h);

  238.             break;

  239.         case CODEC_ID_AAC:

  240.             avio_rb16(pb); avio_r8(pb);

  241.             if (version == 5)

  242.                 avio_r8(pb);

  243.             codecdata_length = avio_rb32(pb);

  244.             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){

  245.                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");

  246.                 return -1;

  247.             }

  248.             if (codecdata_length >= 1) {

  249.                 avio_r8(pb);

  250.                 if ((ret = rm_read_extradata(pb, st->codec, codecdata_length - 1)) < 0)

  251.                     return ret;

  252.             }

  253.             break;

  254.         default:

  255.             av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));

  256.         }

  257.         if (read_all) {

  258.             avio_r8(pb);

  259.             avio_r8(pb);

  260.             avio_r8(pb);

  261.             rm_read_metadata(s, 0);

  262.         }

  263.     }

  264.     return 0;

  265. }

  266. 

  267. int

  268. ff_rm_read_mdpr_codecdata (AVFormatContext *s, AVIOContext *pb,

  269.                            AVStream *st, RMStream *rst, int codec_data_size)

  270. {

  271.     unsigned int v;

  272.     int size;

  273.     int64_t codec_pos;

  274.     int ret;

  275. 

  276.     av_set_pts_info(st, 64, 1, 1000);

  277.     codec_pos = avio_tell(pb);

  278.     v = avio_rb32(pb);

  279.     if (v == MKTAG(0xfd, 'a', 'r', '.')) {

  280.         /* ra type header */

  281.         if (rm_read_audio_stream_info(s, pb, st, rst, 0))

  282.             return -1;

  283.     } else {

  284.         int fps;

  285.         if (avio_rl32(pb) != MKTAG('V', 'I', 'D', 'O')) {

  286.         fail1:

  287.             av_log(st->codec, AV_LOG_ERROR, "Unsupported video codec\n");

  288.             goto skip;

  289.         }

  290.         st->codec->codec_tag = avio_rl32(pb);

  291.         st->codec->codec_id  = ff_codec_get_id(ff_rm_codec_tags,

  292.                                                st->codec->codec_tag);

  293. //        av_log(s, AV_LOG_DEBUG, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));

  294.         if (st->codec->codec_id == CODEC_ID_NONE)

  295.             goto fail1;

  296.         st->codec->width = avio_rb16(pb);

  297.         st->codec->height = avio_rb16(pb);

  298.         st->codec->time_base.num= 1;

  299.         fps= avio_rb16(pb);

  300.         st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

  301.         avio_rb32(pb);

  302.         avio_skip(pb, 2);

  303.         avio_rb16(pb);

  304. 

  305.         if ((ret = rm_read_extradata(pb, st->codec, codec_data_size - (avio_tell(pb) - codec_pos))) < 0)

  306.             return ret;

  307. 

  308. //        av_log(s, AV_LOG_DEBUG, "fps= %d fps2= %d\n", fps, fps2);

  309.         st->codec->time_base.den = fps * st->codec->time_base.num;

  310.         //XXX: do we really need that?

  311.         switch(st->codec->extradata[4]>>4){

  312.         case 1: st->codec->codec_id = CODEC_ID_RV10; break;

  313.         case 2: st->codec->codec_id = CODEC_ID_RV20; break;

  314.         case 3: st->codec->codec_id = CODEC_ID_RV30; break;

  315.         case 4: st->codec->codec_id = CODEC_ID_RV40; break;

  316.         default:

  317.             av_log(st->codec, AV_LOG_ERROR, "extra:%02X %02X %02X %02X %02X\n", st->codec->extradata[0], st->codec->extradata[1], st->codec->extradata[2], st->codec->extradata[3], st->codec->extradata[4]);

  318.             goto fail1;

  319.         }

  320.     }

  321. 

  322. skip:

  323.     /* skip codec info */

  324.     size = avio_tell(pb) - codec_pos;

  325.     avio_skip(pb, codec_data_size - size);

  326. 

  327.     return 0;

  328. }

  329. 

  330. /** this function assumes that the demuxer has already seeked to the start

  331.  * of the INDX chunk, and will bail out if not. */

  332. static int rm_read_index(AVFormatContext *s)

  333. {

  334.     AVIOContext *pb = s->pb;

  335.     unsigned int size, n_pkts, str_id, next_off, n, pos, pts;

  336.     AVStream *st;

  337. 

  338.     do {

  339.         if (avio_rl32(pb) != MKTAG('I','N','D','X'))

  340.             return -1;

  341.         size     = avio_rb32(pb);

  342.         if (size < 20)

  343.             return -1;

  344.         avio_skip(pb, 2);

  345.         n_pkts   = avio_rb32(pb);

  346.         str_id   = avio_rb16(pb);

  347.         next_off = avio_rb32(pb);

  348.         for (n = 0; n < s->nb_streams; n++)

  349.             if (s->streams[n]->id == str_id) {

  350.                 st = s->streams[n];

  351.                 break;

  352.             }

  353.         if (n == s->nb_streams) {

  354.             av_log(s, AV_LOG_ERROR,

  355.                    "Invalid stream index %d for index at pos %"PRId64"\n",

  356.                    str_id, avio_tell(pb));

  357.             goto skip;

  358.         } else if ((avio_size(pb) - avio_tell(pb)) / 14 < n_pkts) {

  359.             av_log(s, AV_LOG_ERROR,

  360.                    "Nr. of packets in packet index for stream index %d "

  361.                    "exceeds filesize (%"PRId64" at %"PRId64" = %d)\n",

  362.                    str_id, avio_size(pb), avio_tell(pb),

  363.                    (avio_size(pb) - avio_tell(pb)) / 14);

  364.             goto skip;

  365.         }

  366. 

  367.         for (n = 0; n < n_pkts; n++) {

  368.             avio_skip(pb, 2);

  369.             pts = avio_rb32(pb);

  370.             pos = avio_rb32(pb);

  371.             avio_skip(pb, 4); /* packet no. */

  372. 

  373.             av_add_index_entry(st, pos, pts, 0, 0, AVINDEX_KEYFRAME);

  374.         }

  375. 

  376. skip:

  377.         if (next_off && avio_tell(pb) < next_off &&

  378.             avio_seek(pb, next_off, SEEK_SET) < 0) {

  379.             av_log(s, AV_LOG_ERROR,

  380.                    "Non-linear index detected, not supported\n");

  381.             return -1;

  382.         }

  383.     } while (next_off);

  384. 

  385.     return 0;

  386. }

  387. 

  388. static int rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap)

  389. {

  390.     RMDemuxContext *rm = s->priv_data;

  391.     AVStream *st;

  392. 

  393.     rm->old_format = 1;

  394.     st = av_new_stream(s, 0);

  395.     if (!st)

  396.         return -1;

  397.     st->priv_data = ff_rm_alloc_rmstream();

  398.     return rm_read_audio_stream_info(s, s->pb, st, st->priv_data, 1);

  399. }

  400. 

  401. static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)

  402. {

  403.     RMDemuxContext *rm = s->priv_data;

  404.     AVStream *st;

  405.     AVIOContext *pb = s->pb;

  406.     unsigned int tag;

  407.     int tag_size;

  408.     unsigned int start_time, duration;

  409.     unsigned int data_off = 0, indx_off = 0;

  410.     char buf[128];

  411.     int flags = 0;

  412. 

  413.     tag = avio_rl32(pb);

  414.     if (tag == MKTAG('.', 'r', 'a', 0xfd)) {

  415.         /* very old .ra format */

  416.         return rm_read_header_old(s, ap);

  417.     } else if (tag != MKTAG('.', 'R', 'M', 'F')) {

  418.         return AVERROR(EIO);

  419.     }

  420. 

  421.     avio_rb32(pb); /* header size */

  422.     avio_rb16(pb);

  423.     avio_rb32(pb);

  424.     avio_rb32(pb); /* number of headers */

  425. 

  426.     for(;;) {

  427.         if (pb->eof_reached)

  428.             return -1;

  429.         tag = avio_rl32(pb);

  430.         tag_size = avio_rb32(pb);

  431.         avio_rb16(pb);

  432.         av_dlog(s, "tag=%c%c%c%c (%08x) size=%d\n",

  433.                 (tag      ) & 0xff,

  434.                 (tag >>  8) & 0xff,

  435.                 (tag >> 16) & 0xff,

  436.                 (tag >> 24) & 0xff,

  437.                 tag,

  438.                 tag_size);

  439.         if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))

  440.             return -1;

  441.         switch(tag) {

  442.         case MKTAG('P', 'R', 'O', 'P'):

  443.             /* file header */

  444.             avio_rb32(pb); /* max bit rate */

  445.             avio_rb32(pb); /* avg bit rate */

  446.             avio_rb32(pb); /* max packet size */

  447.             avio_rb32(pb); /* avg packet size */

  448.             avio_rb32(pb); /* nb packets */

  449.             avio_rb32(pb); /* duration */

  450.             avio_rb32(pb); /* preroll */

  451.             indx_off = avio_rb32(pb); /* index offset */

  452.             data_off = avio_rb32(pb); /* data offset */

  453.             avio_rb16(pb); /* nb streams */

  454.             flags = avio_rb16(pb); /* flags */

  455.             break;

  456.         case MKTAG('C', 'O', 'N', 'T'):

  457.             rm_read_metadata(s, 1);

  458.             break;

  459.         case MKTAG('M', 'D', 'P', 'R'):

  460.             st = av_new_stream(s, 0);

  461.             if (!st)

  462.                 return AVERROR(ENOMEM);

  463.             st->id = avio_rb16(pb);

  464.             avio_rb32(pb); /* max bit rate */

  465.             st->codec->bit_rate = avio_rb32(pb); /* bit rate */

  466.             avio_rb32(pb); /* max packet size */

  467.             avio_rb32(pb); /* avg packet size */

  468.             start_time = avio_rb32(pb); /* start time */

  469.             avio_rb32(pb); /* preroll */

  470.             duration = avio_rb32(pb); /* duration */

  471.             st->start_time = start_time;

  472.             st->duration = duration;

  473.             get_str8(pb, buf, sizeof(buf)); /* desc */

  474.             get_str8(pb, buf, sizeof(buf)); /* mimetype */

  475.             st->codec->codec_type = AVMEDIA_TYPE_DATA;

  476.             st->priv_data = ff_rm_alloc_rmstream();

  477.             if (ff_rm_read_mdpr_codecdata(s, s->pb, st, st->priv_data,

  478.                                           avio_rb32(pb)) < 0)

  479.                 return -1;

  480.             break;

  481.         case MKTAG('D', 'A', 'T', 'A'):

  482.             goto header_end;

  483.         default:

  484.             /* unknown tag: skip it */

  485.             avio_skip(pb, tag_size - 10);

  486.             break;

  487.         }

  488.     }

  489.  header_end:

  490.     rm->nb_packets = avio_rb32(pb); /* number of packets */

  491.     if (!rm->nb_packets && (flags & 4))

  492.         rm->nb_packets = 3600 * 25;

  493.     avio_rb32(pb); /* next data header */

  494. 

  495.     if (!data_off)

  496.         data_off = avio_tell(pb) - 18;

  497.     if (indx_off && pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&

  498.         avio_seek(pb, indx_off, SEEK_SET) >= 0) {

  499.         rm_read_index(s);

  500.         avio_seek(pb, data_off + 18, SEEK_SET);

  501.     }

  502. 

  503.     return 0;

  504. }

  505. 

  506. static int get_num(AVIOContext *pb, int *len)

  507. {

  508.     int n, n1;

  509. 

  510.     n = avio_rb16(pb);

  511.     (*len)-=2;

  512.     n &= 0x7FFF;

  513.     if (n >= 0x4000) {

  514.         return n - 0x4000;

  515.     } else {

  516.         n1 = avio_rb16(pb);

  517.         (*len)-=2;

  518.         return (n << 16) | n1;

  519.     }

  520. }

  521. 

  522. /* multiple of 20 bytes for ra144 (ugly) */

  523. #define RAW_PACKET_SIZE 1000

  524. 

  525. static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){

  526.     RMDemuxContext *rm = s->priv_data;

  527.     AVIOContext *pb = s->pb;

  528.     AVStream *st;

  529.     uint32_t state=0xFFFFFFFF;

  530. 

  531.     while(!pb->eof_reached){

  532.         int len, num, i;

  533.         *pos= avio_tell(pb) - 3;

  534.         if(rm->remaining_len > 0){

  535.             num= rm->current_stream;

  536.             len= rm->remaining_len;

  537.             *timestamp = AV_NOPTS_VALUE;

  538.             *flags= 0;

  539.         }else{

  540.             state= (state<<8) + avio_r8(pb);

  541. 

  542.             if(state == MKBETAG('I', 'N', 'D', 'X')){

  543.                 int n_pkts, expected_len;

  544.                 len = avio_rb32(pb);

  545.                 avio_skip(pb, 2);

  546.                 n_pkts = avio_rb32(pb);

  547.                 expected_len = 20 + n_pkts * 14;

  548.                 if (len == 20)

  549.                     /* some files don't add index entries to chunk size... */

  550.                     len = expected_len;

  551.                 else if (len != expected_len)

  552.                     av_log(s, AV_LOG_WARNING,

  553.                            "Index size %d (%d pkts) is wrong, should be %d.\n",

  554.                            len, n_pkts, expected_len);

  555.                 len -= 14; // we already read part of the index header

  556.                 if(len<0)

  557.                     continue;

  558.                 goto skip;

  559.             } else if (state == MKBETAG('D','A','T','A')) {

  560.                 av_log(s, AV_LOG_WARNING,

  561.                        "DATA tag in middle of chunk, file may be broken.\n");

  562.             }

  563. 

  564.             if(state > (unsigned)0xFFFF || state <= 12)

  565.                 continue;

  566.             len=state - 12;

  567.             state= 0xFFFFFFFF;

  568. 

  569.             num = avio_rb16(pb);

  570.             *timestamp = avio_rb32(pb);

  571.             avio_r8(pb); /* reserved */

  572.             *flags = avio_r8(pb); /* flags */

  573.         }

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

  575.             st = s->streams[i];

  576.             if (num == st->id)

  577.                 break;

  578.         }

  579.         if (i == s->nb_streams) {

  580. skip:

  581.             /* skip packet if unknown number */

  582.             avio_skip(pb, len);

  583.             rm->remaining_len = 0;

  584.             continue;

  585.         }

  586.         *stream_index= i;

  587. 

  588.         return len;

  589.     }

  590.     return -1;

  591. }

  592. 

  593. static int rm_assemble_video_frame(AVFormatContext *s, AVIOContext *pb,

  594.                                    RMDemuxContext *rm, RMStream *vst,

  595.                                    AVPacket *pkt, int len, int *pseq)

  596. {

  597.     int hdr, seq, pic_num, len2, pos;

  598.     int type;

  599. 

  600.     hdr = avio_r8(pb); len--;

  601.     type = hdr >> 6;

  602. 

  603.     if(type != 3){  // not frame as a part of packet

  604.         seq = avio_r8(pb); len--;

  605.     }

  606.     if(type != 1){  // not whole frame

  607.         len2 = get_num(pb, &len);

  608.         pos  = get_num(pb, &len);

  609.         pic_num = avio_r8(pb); len--;

  610.     }

  611.     if(len<0)

  612.         return -1;

  613.     rm->remaining_len = len;

  614.     if(type&1){     // frame, not slice

  615.         if(type == 3)  // frame as a part of packet

  616.             len= len2;

  617.         if(rm->remaining_len < len)

  618.             return -1;

  619.         rm->remaining_len -= len;

  620.         if(av_new_packet(pkt, len + 9) < 0)

  621.             return AVERROR(EIO);

  622.         pkt->data[0] = 0;

  623.         AV_WL32(pkt->data + 1, 1);

  624.         AV_WL32(pkt->data + 5, 0);

  625.         avio_read(pb, pkt->data + 9, len);

  626.         return 0;

  627.     }

  628.     //now we have to deal with single slice

  629. 

  630.     *pseq = seq;

  631.     if((seq & 0x7F) == 1 || vst->curpic_num != pic_num){

  632.         vst->slices = ((hdr & 0x3F) << 1) + 1;

  633.         vst->videobufsize = len2 + 8*vst->slices + 1;

  634.         av_free_packet(&vst->pkt); //FIXME this should be output.

  635.         if(av_new_packet(&vst->pkt, vst->videobufsize) < 0)

  636.             return AVERROR(ENOMEM);

  637.         vst->videobufpos = 8*vst->slices + 1;

  638.         vst->cur_slice = 0;

  639.         vst->curpic_num = pic_num;

  640.         vst->pktpos = avio_tell(pb);

  641.     }

  642.     if(type == 2)

  643.         len = FFMIN(len, pos);

  644. 

  645.     if(++vst->cur_slice > vst->slices)

  646.         return 1;

  647.     AV_WL32(vst->pkt.data - 7 + 8*vst->cur_slice, 1);

  648.     AV_WL32(vst->pkt.data - 3 + 8*vst->cur_slice, vst->videobufpos - 8*vst->slices - 1);

  649.     if(vst->videobufpos + len > vst->videobufsize)

  650.         return 1;

  651.     if (avio_read(pb, vst->pkt.data + vst->videobufpos, len) != len)

  652.         return AVERROR(EIO);

  653.     vst->videobufpos += len;

  654.     rm->remaining_len-= len;

  655. 

  656.     if(type == 2 || (vst->videobufpos) == vst->videobufsize){

  657.         vst->pkt.data[0] = vst->cur_slice-1;

  658.         *pkt= vst->pkt;

  659.         vst->pkt.data= NULL;

  660.         vst->pkt.size= 0;

  661.         if(vst->slices != vst->cur_slice) //FIXME find out how to set slices correct from the begin

  662.             memmove(pkt->data + 1 + 8*vst->cur_slice, pkt->data + 1 + 8*vst->slices,

  663.                 vst->videobufpos - 1 - 8*vst->slices);

  664.         pkt->size = vst->videobufpos + 8*(vst->cur_slice - vst->slices);

  665.         pkt->pts = AV_NOPTS_VALUE;

  666.         pkt->pos = vst->pktpos;

  667.         vst->slices = 0;

  668.         return 0;

  669.     }

  670. 

  671.     return 1;

  672. }

  673. 

  674. static inline void

  675. rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt)

  676. {

  677.     uint8_t *ptr;

  678.     int j;

  679. 

  680.     if (st->codec->codec_id == CODEC_ID_AC3) {

  681.         ptr = pkt->data;

  682.         for (j=0;j<pkt->size;j+=2) {

  683.             FFSWAP(int, ptr[0], ptr[1]);

  684.             ptr += 2;

  685.         }

  686.     }

  687. }

  688. 

  689. /**

  690.  * Perform 4-bit block reordering for SIPR data.

  691.  * @todo This can be optimized, e.g. use memcpy() if data blocks are aligned

  692.  */

  693. void ff_rm_reorder_sipr_data(uint8_t *buf, int sub_packet_h, int framesize)

  694. {

  695.     int n, bs = sub_packet_h * framesize * 2 / 96; // nibbles per subpacket

  696. 

  697.     for (n = 0; n < 38; n++) {

  698.         int j;

  699.         int i = bs * sipr_swaps[n][0];

  700.         int o = bs * sipr_swaps[n][1];

  701. 

  702.         /* swap 4bit-nibbles of block 'i' with 'o' */

  703.         for (j = 0; j < bs; j++, i++, o++) {

  704.             int x = (buf[i >> 1] >> (4 * (i & 1))) & 0xF,

  705.                 y = (buf[o >> 1] >> (4 * (o & 1))) & 0xF;

  706. 

  707.             buf[o >> 1] = (x << (4 * (o & 1))) |

  708.                 (buf[o >> 1] & (0xF << (4 * !(o & 1))));

  709.             buf[i >> 1] = (y << (4 * (i & 1))) |

  710.                 (buf[i >> 1] & (0xF << (4 * !(i & 1))));

  711.         }

  712.     }

  713. }

  714. 

  715. int

  716. ff_rm_parse_packet (AVFormatContext *s, AVIOContext *pb,

  717.                     AVStream *st, RMStream *ast, int len, AVPacket *pkt,

  718.                     int *seq, int flags, int64_t timestamp)

  719. {

  720.     RMDemuxContext *rm = s->priv_data;

  721. 

  722.     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  723.         rm->current_stream= st->id;

  724.         if(rm_assemble_video_frame(s, pb, rm, ast, pkt, len, seq))

  725.             return -1; //got partial frame

  726.     } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {

  727.         if ((st->codec->codec_id == CODEC_ID_RA_288) ||

  728.             (st->codec->codec_id == CODEC_ID_COOK) ||

  729.             (st->codec->codec_id == CODEC_ID_ATRAC3) ||

  730.             (st->codec->codec_id == CODEC_ID_SIPR)) {

  731.             int x;

  732.             int sps = ast->sub_packet_size;

  733.             int cfs = ast->coded_framesize;

  734.             int h = ast->sub_packet_h;

  735.             int y = ast->sub_packet_cnt;

  736.             int w = ast->audio_framesize;

  737. 

  738.             if (flags & 2)

  739.                 y = ast->sub_packet_cnt = 0;

  740.             if (!y)

  741.                 ast->audiotimestamp = timestamp;

  742. 

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

  744.                 case CODEC_ID_RA_288:

  745.                     for (x = 0; x < h/2; x++)

  746.                         avio_read(pb, ast->pkt.data+x*2*w+y*cfs, cfs);

  747.                     break;

  748.                 case CODEC_ID_ATRAC3:

  749.                 case CODEC_ID_COOK:

  750.                     for (x = 0; x < w/sps; x++)

  751.                         avio_read(pb, ast->pkt.data+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);

  752.                     break;

  753.                 case CODEC_ID_SIPR:

  754.                     avio_read(pb, ast->pkt.data + y * w, w);

  755.                     break;

  756.             }

  757. 

  758.             if (++(ast->sub_packet_cnt) < h)

  759.                 return -1;

  760.             if (st->codec->codec_id == CODEC_ID_SIPR)

  761.                 ff_rm_reorder_sipr_data(ast->pkt.data, h, w);

  762. 

  763.              ast->sub_packet_cnt = 0;

  764.              rm->audio_stream_num = st->index;

  765.              rm->audio_pkt_cnt = h * w / st->codec->block_align;

  766.         } else if (st->codec->codec_id == CODEC_ID_AAC) {

  767.             int x;

  768.             rm->audio_stream_num = st->index;

  769.             ast->sub_packet_cnt = (avio_rb16(pb) & 0xf0) >> 4;

  770.             if (ast->sub_packet_cnt) {

  771.                 for (x = 0; x < ast->sub_packet_cnt; x++)

  772.                     ast->sub_packet_lengths[x] = avio_rb16(pb);

  773.                 rm->audio_pkt_cnt = ast->sub_packet_cnt;

  774.                 ast->audiotimestamp = timestamp;

  775.             } else

  776.                 return -1;

  777.         } else {

  778.             av_get_packet(pb, pkt, len);

  779.             rm_ac3_swap_bytes(st, pkt);

  780.         }

  781.     } else

  782.         av_get_packet(pb, pkt, len);

  783. 

  784.     pkt->stream_index = st->index;

  785. 

  786. #if 0

  787.     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  788.         if(st->codec->codec_id == CODEC_ID_RV20){

  789.             int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);

  790.             av_log(s, AV_LOG_DEBUG, "%d %"PRId64" %d\n", *timestamp, *timestamp*512LL/25, seq);

  791. 

  792.             seq |= (timestamp&~0x3FFF);

  793.             if(seq - timestamp >  0x2000) seq -= 0x4000;

  794.             if(seq - timestamp < -0x2000) seq += 0x4000;

  795.         }

  796.     }

  797. #endif

  798. 

  799.     pkt->pts= timestamp;

  800.     if (flags & 2)

  801.         pkt->flags |= AV_PKT_FLAG_KEY;

  802. 

  803.     return st->codec->codec_type == AVMEDIA_TYPE_AUDIO ? rm->audio_pkt_cnt : 0;

  804. }

  805. 

  806. int

  807. ff_rm_retrieve_cache (AVFormatContext *s, AVIOContext *pb,

  808.                       AVStream *st, RMStream *ast, AVPacket *pkt)

  809. {

  810.     RMDemuxContext *rm = s->priv_data;

  811. 

  812.     assert (rm->audio_pkt_cnt > 0);

  813. 

  814.     if (st->codec->codec_id == CODEC_ID_AAC)

  815.         av_get_packet(pb, pkt, ast->sub_packet_lengths[ast->sub_packet_cnt - rm->audio_pkt_cnt]);

  816.     else {

  817.         av_new_packet(pkt, st->codec->block_align);

  818.         memcpy(pkt->data, ast->pkt.data + st->codec->block_align * //FIXME avoid this

  819.                (ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),

  820.                st->codec->block_align);

  821.     }

  822.     rm->audio_pkt_cnt--;

  823.     if ((pkt->pts = ast->audiotimestamp) != AV_NOPTS_VALUE) {

  824.         ast->audiotimestamp = AV_NOPTS_VALUE;

  825.         pkt->flags = AV_PKT_FLAG_KEY;

  826.     } else

  827.         pkt->flags = 0;

  828.     pkt->stream_index = st->index;

  829. 

  830.     return rm->audio_pkt_cnt;

  831. }

  832. 

  833. static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)

  834. {

  835.     RMDemuxContext *rm = s->priv_data;

  836.     AVStream *st;

  837.     int i, len, res, seq = 1;

  838.     int64_t timestamp, pos;

  839.     int flags;

  840. 

  841.     for (;;) {

  842.         if (rm->audio_pkt_cnt) {

  843.             // If there are queued audio packet return them first

  844.             st = s->streams[rm->audio_stream_num];

  845.             ff_rm_retrieve_cache(s, s->pb, st, st->priv_data, pkt);

  846.             flags = 0;

  847.         } else {

  848.             if (rm->old_format) {

  849.                 RMStream *ast;

  850. 

  851.                 st = s->streams[0];

  852.                 ast = st->priv_data;

  853.                 timestamp = AV_NOPTS_VALUE;

  854.                 len = !ast->audio_framesize ? RAW_PACKET_SIZE :

  855.                     ast->coded_framesize * ast->sub_packet_h / 2;

  856.                 flags = (seq++ == 1) ? 2 : 0;

  857.                 pos = avio_tell(s->pb);

  858.             } else {

  859.                 len=sync(s, &timestamp, &flags, &i, &pos);

  860.                 if (len > 0)

  861.                     st = s->streams[i];

  862.             }

  863. 

  864.             if(len<0 || s->pb->eof_reached)

  865.                 return AVERROR(EIO);

  866. 

  867.             res = ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,

  868.                                       &seq, flags, timestamp);

  869.             if((flags&2) && (seq&0x7F) == 1)

  870.                 av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);

  871.             if (res)

  872.                 continue;

  873.         }

  874. 

  875.         if(  (st->discard >= AVDISCARD_NONKEY && !(flags&2))

  876.            || st->discard >= AVDISCARD_ALL){

  877.             av_free_packet(pkt);

  878.         } else

  879.             break;

  880.     }

  881. 

  882.     return 0;

  883. }

  884. 

  885. static int rm_read_close(AVFormatContext *s)

  886. {

  887.     int i;

  888. 

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

  890.         ff_rm_free_rmstream(s->streams[i]->priv_data);

  891. 

  892.     return 0;

  893. }

  894. 

  895. static int rm_probe(AVProbeData *p)

  896. {

  897.     /* check file header */

  898.     if ((p->buf[0] == '.' && p->buf[1] == 'R' &&

  899.          p->buf[2] == 'M' && p->buf[3] == 'F' &&

  900.          p->buf[4] == 0 && p->buf[5] == 0) ||

  901.         (p->buf[0] == '.' && p->buf[1] == 'r' &&

  902.          p->buf[2] == 'a' && p->buf[3] == 0xfd))

  903.         return AVPROBE_SCORE_MAX;

  904.     else

  905.         return 0;

  906. }

  907. 

  908. static int64_t rm_read_dts(AVFormatContext *s, int stream_index,

  909.                                int64_t *ppos, int64_t pos_limit)

  910. {

  911.     RMDemuxContext *rm = s->priv_data;

  912.     int64_t pos, dts;

  913.     int stream_index2, flags, len, h;

  914. 

  915.     pos = *ppos;

  916. 

  917.     if(rm->old_format)

  918.         return AV_NOPTS_VALUE;

  919. 

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

  921.     rm->remaining_len=0;

  922.     for(;;){

  923.         int seq=1;

  924.         AVStream *st;

  925. 

  926.         len=sync(s, &dts, &flags, &stream_index2, &pos);

  927.         if(len<0)

  928.             return AV_NOPTS_VALUE;

  929. 

  930.         st = s->streams[stream_index2];

  931.         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  932.             h= avio_r8(s->pb); len--;

  933.             if(!(h & 0x40)){

  934.                 seq = avio_r8(s->pb); len--;

  935.             }

  936.         }

  937. 

  938.         if((flags&2) && (seq&0x7F) == 1){

  939. //            av_log(s, AV_LOG_DEBUG, "%d %d-%d %"PRId64" %d\n", flags, stream_index2, stream_index, dts, seq);

  940.             av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);

  941.             if(stream_index2 == stream_index)

  942.                 break;

  943.         }

  944. 

  945.         avio_skip(s->pb, len);

  946.     }

  947.     *ppos = pos;

  948.     return dts;

  949. }

  950. 

  951. AVInputFormat ff_rm_demuxer = {

  952.     "rm",

  953.     NULL_IF_CONFIG_SMALL("RealMedia format"),

  954.     sizeof(RMDemuxContext),

  955.     rm_probe,

  956.     rm_read_header,

  957.     rm_read_packet,

  958.     rm_read_close,

  959.     NULL,

  960.     rm_read_dts,

  961. };

  962. 

  963. AVInputFormat ff_rdt_demuxer = {

  964.     "rdt",

  965.     NULL_IF_CONFIG_SMALL("RDT demuxer"),

  966.     sizeof(RMDemuxContext),

  967.     NULL,

  968.     NULL,

  969.     NULL,

  970.     rm_read_close,

  971. };