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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 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. #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 <= 0 || sub_packet_h <= 0 ||

  196.                 ast->audio_framesize >= UINT_MAX / sub_packet_h){

  197.                 av_log(s, AV_LOG_ERROR, "ast->audio_framesize * sub_packet_h is invalid\n");

  198.                 return -1;

  199.             }

  200. 

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

  202.             break;

  203.         case CODEC_ID_COOK:

  204.         case CODEC_ID_ATRAC3:

  205.         case CODEC_ID_SIPR:

  206.             avio_rb16(pb); avio_r8(pb);

  207.             if (version == 5)

  208.                 avio_r8(pb);

  209.             codecdata_length = avio_rb32(pb);

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

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

  212.                 return -1;

  213.             }

  214. 

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

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

  217.                 if (flavor > 3) {

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

  219.                            flavor);

  220.                     return -1;

  221.                 }

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

  223.             } else {

  224.                 if(sub_packet_size <= 0){

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

  226.                     return -1;

  227.                 }

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

  229.             }

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

  231.                 return ret;

  232. 

  233.             if (ast->audio_framesize <= 0 || sub_packet_h <= 0 ||

  234.                 ast->audio_framesize >= UINT_MAX / sub_packet_h){

  235.                 av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h is invalid\n");

  236.                 return -1;

  237.             }

  238. 

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

  240.             break;

  241.         case CODEC_ID_AAC:

  242.             avio_rb16(pb); avio_r8(pb);

  243.             if (version == 5)

  244.                 avio_r8(pb);

  245.             codecdata_length = avio_rb32(pb);

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

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

  248.                 return -1;

  249.             }

  250.             if (codecdata_length >= 1) {

  251.                 avio_r8(pb);

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

  253.                     return ret;

  254.             }

  255.             break;

  256.         default:

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

  258.         }

  259.         if (read_all) {

  260.             avio_r8(pb);

  261.             avio_r8(pb);

  262.             avio_r8(pb);

  263.             rm_read_metadata(s, 0);

  264.         }

  265.     }

  266.     return 0;

  267. }

  268. 

  269. int

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

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

  272. {

  273.     unsigned int v;

  274.     int size;

  275.     int64_t codec_pos;

  276.     int ret;

  277. 

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

  279.     codec_pos = avio_tell(pb);

  280.     v = avio_rb32(pb);

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

  282.         /* ra type header */

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

  284.             return -1;

  285.     } else {

  286.         int fps;

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

  288.         fail1:

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

  290.             goto skip;

  291.         }

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

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

  294.                                                st->codec->codec_tag);

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

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

  297.             goto fail1;

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

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

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

  301.         fps= avio_rb16(pb);

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

  303.         avio_rb32(pb);

  304.         avio_skip(pb, 2);

  305.         avio_rb16(pb);

  306. 

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

  308.             return ret;

  309. 

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

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

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

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

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

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

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

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

  318.         default:

  319.             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]);

  320.             goto fail1;

  321.         }

  322.     }

  323. 

  324. skip:

  325.     /* skip codec info */

  326.     size = avio_tell(pb) - codec_pos;

  327.     avio_skip(pb, codec_data_size - size);

  328. 

  329.     return 0;

  330. }

  331. 

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

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

  334. static int rm_read_index(AVFormatContext *s)

  335. {

  336.     AVIOContext *pb = s->pb;

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

  338.     AVStream *st;

  339. 

  340.     do {

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

  342.             return -1;

  343.         size     = avio_rb32(pb);

  344.         if (size < 20)

  345.             return -1;

  346.         avio_skip(pb, 2);

  347.         n_pkts   = avio_rb32(pb);

  348.         str_id   = avio_rb16(pb);

  349.         next_off = avio_rb32(pb);

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

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

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

  353.                 break;

  354.             }

  355.         if (n == s->nb_streams)

  356.             goto skip;

  357. 

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

  359.             avio_skip(pb, 2);

  360.             pts = avio_rb32(pb);

  361.             pos = avio_rb32(pb);

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

  363. 

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

  365.         }

  366. 

  367. skip:

  368.         if (next_off && avio_tell(pb) != next_off &&

  369.             avio_seek(pb, next_off, SEEK_SET) < 0)

  370.             return -1;

  371.     } while (next_off);

  372. 

  373.     return 0;

  374. }

  375. 

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

  377. {

  378.     RMDemuxContext *rm = s->priv_data;

  379.     AVStream *st;

  380. 

  381.     rm->old_format = 1;

  382.     st = av_new_stream(s, 0);

  383.     if (!st)

  384.         return -1;

  385.     st->priv_data = ff_rm_alloc_rmstream();

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

  387. }

  388. 

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

  390. {

  391.     RMDemuxContext *rm = s->priv_data;

  392.     AVStream *st;

  393.     AVIOContext *pb = s->pb;

  394.     unsigned int tag;

  395.     int tag_size;

  396.     unsigned int start_time, duration;

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

  398.     char buf[128];

  399.     int flags = 0;

  400. 

  401.     tag = avio_rl32(pb);

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

  403.         /* very old .ra format */

  404.         return rm_read_header_old(s, ap);

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

  406.         return AVERROR(EIO);

  407.     }

  408. 

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

  410.     avio_rb16(pb);

  411.     avio_rb32(pb);

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

  413. 

  414.     for(;;) {

  415.         if (url_feof(pb))

  416.             return -1;

  417.         tag = avio_rl32(pb);

  418.         tag_size = avio_rb32(pb);

  419.         avio_rb16(pb);

  420. #if 0

  421.         printf("tag=%c%c%c%c (%08x) size=%d\n",

  422.                (tag) & 0xff,

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

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

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

  426.                tag,

  427.                tag_size);

  428. #endif

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

  430.             return -1;

  431.         switch(tag) {

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

  433.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

  445.             break;

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

  447.             rm_read_metadata(s, 1);

  448.             break;

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

  450.             st = av_new_stream(s, 0);

  451.             if (!st)

  452.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  461.             st->start_time = start_time;

  462.             st->duration = duration;

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

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

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

  466.             st->priv_data = ff_rm_alloc_rmstream();

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

  468.                                           avio_rb32(pb)) < 0)

  469.                 return -1;

  470.             break;

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

  472.             goto header_end;

  473.         default:

  474.             /* unknown tag: skip it */

  475.             avio_skip(pb, tag_size - 10);

  476.             break;

  477.         }

  478.     }

  479.  header_end:

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

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

  482.         rm->nb_packets = 3600 * 25;

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

  484. 

  485.     if (!data_off)

  486.         data_off = avio_tell(pb) - 18;

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

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

  489.         rm_read_index(s);

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

  491.     }

  492. 

  493.     return 0;

  494. }

  495. 

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

  497. {

  498.     int n, n1;

  499. 

  500.     n = avio_rb16(pb);

  501.     (*len)-=2;

  502.     n &= 0x7FFF;

  503.     if (n >= 0x4000) {

  504.         return n - 0x4000;

  505.     } else {

  506.         n1 = avio_rb16(pb);

  507.         (*len)-=2;

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

  509.     }

  510. }

  511. 

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

  513. #define RAW_PACKET_SIZE 1000

  514. 

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

  516.     RMDemuxContext *rm = s->priv_data;

  517.     AVIOContext *pb = s->pb;

  518.     AVStream *st;

  519.     uint32_t state=0xFFFFFFFF;

  520. 

  521.     while(!url_feof(pb)){

  522.         int len, num, i;

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

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

  525.             num= rm->current_stream;

  526.             len= rm->remaining_len;

  527.             *timestamp = AV_NOPTS_VALUE;

  528.             *flags= 0;

  529.         }else{

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

  531. 

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

  533.                 int n_pkts, expected_len;

  534.                 len = avio_rb32(pb);

  535.                 avio_skip(pb, 2);

  536.                 n_pkts = avio_rb32(pb);

  537.                 expected_len = 20 + n_pkts * 14;

  538.                 if (len == 20)

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

  540.                     len = expected_len;

  541.                 else if (len != expected_len)

  542.                     av_log(s, AV_LOG_WARNING,

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

  544.                            len, n_pkts, expected_len);

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

  546.                 if(len<0)

  547.                     continue;

  548.                 goto skip;

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

  550.                 av_log(s, AV_LOG_WARNING,

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

  552.             }

  553. 

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

  555.                 continue;

  556.             len=state - 12;

  557.             state= 0xFFFFFFFF;

  558. 

  559.             num = avio_rb16(pb);

  560.             *timestamp = avio_rb32(pb);

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

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

  563.         }

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

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

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

  567.                 break;

  568.         }

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

  570. skip:

  571.             /* skip packet if unknown number */

  572.             avio_skip(pb, len);

  573.             rm->remaining_len = 0;

  574.             continue;

  575.         }

  576.         *stream_index= i;

  577. 

  578.         return len;

  579.     }

  580.     return -1;

  581. }

  582. 

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

  584.                                    RMDemuxContext *rm, RMStream *vst,

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

  586. {

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

  588.     int type;

  589. 

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

  591.     type = hdr >> 6;

  592. 

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

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

  595.     }

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

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

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

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

  600.     }

  601.     if(len<0)

  602.         return -1;

  603.     rm->remaining_len = len;

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

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

  606.             len= len2;

  607.         if(rm->remaining_len < len)

  608.             return -1;

  609.         rm->remaining_len -= len;

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

  611.             return AVERROR(EIO);

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

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

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

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

  616.         return 0;

  617.     }

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

  619. 

  620.     *pseq = seq;

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

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

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

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

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

  626.             return AVERROR(ENOMEM);

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

  628.         vst->cur_slice = 0;

  629.         vst->curpic_num = pic_num;

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

  631.     }

  632.     if(type == 2)

  633.         len = FFMIN(len, pos);

  634. 

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

  636.         return 1;

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

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

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

  640.         return 1;

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

  642.         return AVERROR(EIO);

  643.     vst->videobufpos += len;

  644.     rm->remaining_len-= len;

  645. 

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

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

  648.         *pkt= vst->pkt;

  649.         vst->pkt.data= NULL;

  650.         vst->pkt.size= 0;

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

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

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

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

  655.         pkt->pts = AV_NOPTS_VALUE;

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

  657.         vst->slices = 0;

  658.         return 0;

  659.     }

  660. 

  661.     return 1;

  662. }

  663. 

  664. static inline void

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

  666. {

  667.     uint8_t *ptr;

  668.     int j;

  669. 

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

  671.         ptr = pkt->data;

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

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

  674.             ptr += 2;

  675.         }

  676.     }

  677. }

  678. 

  679. /**

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

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

  682.  */

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

  684. {

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

  686. 

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

  688.         int j;

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

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

  691. 

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

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

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

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

  696. 

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

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

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

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

  701.         }

  702.     }

  703. }

  704. 

  705. int

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

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

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

  709. {

  710.     RMDemuxContext *rm = s->priv_data;

  711. 

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

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

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

  715.             return -1; //got partial frame

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

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

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

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

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

  721.             int x;

  722.             int sps = ast->sub_packet_size;

  723.             int cfs = ast->coded_framesize;

  724.             int h = ast->sub_packet_h;

  725.             int y = ast->sub_packet_cnt;

  726.             int w = ast->audio_framesize;

  727. 

  728.             if (flags & 2)

  729.                 y = ast->sub_packet_cnt = 0;

  730.             if (!y)

  731.                 ast->audiotimestamp = timestamp;

  732. 

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

  734.                 case CODEC_ID_RA_288:

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

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

  737.                     break;

  738.                 case CODEC_ID_ATRAC3:

  739.                 case CODEC_ID_COOK:

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

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

  742.                     break;

  743.                 case CODEC_ID_SIPR:

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

  745.                     break;

  746.             }

  747. 

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

  749.                 return -1;

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

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

  752. 

  753.              ast->sub_packet_cnt = 0;

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

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

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

  757.             int x;

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

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

  760.             if (ast->sub_packet_cnt) {

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

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

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

  764.                 ast->audiotimestamp = timestamp;

  765.             } else

  766.                 return -1;

  767.         } else {

  768.             av_get_packet(pb, pkt, len);

  769.             rm_ac3_swap_bytes(st, pkt);

  770.         }

  771.     } else

  772.         av_get_packet(pb, pkt, len);

  773. 

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

  775. 

  776. #if 0

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

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

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

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

  781. 

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

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

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

  785.         }

  786.     }

  787. #endif

  788. 

  789.     pkt->pts= timestamp;

  790.     if (flags & 2)

  791.         pkt->flags |= AV_PKT_FLAG_KEY;

  792. 

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

  794. }

  795. 

  796. int

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

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

  799. {

  800.     RMDemuxContext *rm = s->priv_data;

  801. 

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

  803. 

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

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

  806.     else {

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

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

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

  810.                st->codec->block_align);

  811.     }

  812.     rm->audio_pkt_cnt--;

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

  814.         ast->audiotimestamp = AV_NOPTS_VALUE;

  815.         pkt->flags = AV_PKT_FLAG_KEY;

  816.     } else

  817.         pkt->flags = 0;

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

  819. 

  820.     return rm->audio_pkt_cnt;

  821. }

  822. 

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

  824. {

  825.     RMDemuxContext *rm = s->priv_data;

  826.     AVStream *st;

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

  828.     int64_t timestamp, pos;

  829.     int flags;

  830. 

  831.     for (;;) {

  832.         if (rm->audio_pkt_cnt) {

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

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

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

  836.             flags = 0;

  837.         } else {

  838.             if (rm->old_format) {

  839.                 RMStream *ast;

  840. 

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

  842.                 ast = st->priv_data;

  843.                 timestamp = AV_NOPTS_VALUE;

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

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

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

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

  848.             } else {

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

  850.                 if (len > 0)

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

  852.             }

  853. 

  854.             if(len<0 || url_feof(s->pb))

  855.                 return AVERROR(EIO);

  856. 

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

  858.                                       &seq, flags, timestamp);

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

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

  861.             if (res)

  862.                 continue;

  863.         }

  864. 

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

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

  867.             av_free_packet(pkt);

  868.         } else

  869.             break;

  870.     }

  871. 

  872.     return 0;

  873. }

  874. 

  875. static int rm_read_close(AVFormatContext *s)

  876. {

  877.     int i;

  878. 

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

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

  881. 

  882.     return 0;

  883. }

  884. 

  885. static int rm_probe(AVProbeData *p)

  886. {

  887.     /* check file header */

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

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

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

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

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

  893.         return AVPROBE_SCORE_MAX;

  894.     else

  895.         return 0;

  896. }

  897. 

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

  899.                                int64_t *ppos, int64_t pos_limit)

  900. {

  901.     RMDemuxContext *rm = s->priv_data;

  902.     int64_t pos, dts;

  903.     int stream_index2, flags, len, h;

  904. 

  905.     pos = *ppos;

  906. 

  907.     if(rm->old_format)

  908.         return AV_NOPTS_VALUE;

  909. 

  910.     if (avio_seek(s->pb, pos, SEEK_SET) < 0)

  911.         return AV_NOPTS_VALUE;

  912. 

  913.     rm->remaining_len=0;

  914.     for(;;){

  915.         int seq=1;

  916.         AVStream *st;

  917. 

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

  919.         if(len<0)

  920.             return AV_NOPTS_VALUE;

  921. 

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

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

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

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

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

  927.             }

  928.         }

  929. 

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

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

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

  933.             if(stream_index2 == stream_index)

  934.                 break;

  935.         }

  936. 

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

  938.     }

  939.     *ppos = pos;

  940.     return dts;

  941. }

  942. 

  943. AVInputFormat ff_rm_demuxer = {

  944.     "rm",

  945.     NULL_IF_CONFIG_SMALL("RealMedia format"),

  946.     sizeof(RMDemuxContext),

  947.     rm_probe,

  948.     rm_read_header,

  949.     rm_read_packet,

  950.     rm_read_close,

  951.     NULL,

  952.     rm_read_dts,

  953. };

  954. 

  955. AVInputFormat ff_rdt_demuxer = {

  956.     "rdt",

  957.     NULL_IF_CONFIG_SMALL("RDT demuxer"),

  958.     sizeof(RMDemuxContext),

  959.     NULL,

  960.     NULL,

  961.     NULL,

  962.     rm_read_close,

  963. };