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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 "internal.h"

  27. #include "riff.h"

  28. #include "rm.h"

  29. 

  30. #define DEINT_ID_GENR MKTAG('g', 'e', 'n', 'r') ///< interleaving for Cooker/Atrac

  31. #define DEINT_ID_INT0 MKTAG('I', 'n', 't', '0') ///< no interleaving needed

  32. #define DEINT_ID_INT4 MKTAG('I', 'n', 't', '4') ///< interleaving for 28.8

  33. #define DEINT_ID_SIPR MKTAG('s', 'i', 'p', 'r') ///< interleaving for Sipro

  34. #define DEINT_ID_VBRF MKTAG('v', 'b', 'r', 'f') ///< VBR case for AAC

  35. #define DEINT_ID_VBRS MKTAG('v', 'b', 'r', 's') ///< VBR case for AAC

  36. 

  37. struct RMStream {

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

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

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

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

  42.     int cur_slice, slices;

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

  44.     /// Audio descrambling matrix parameters

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

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

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

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

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

  50.     int32_t deint_id;  ///< deinterleaver used in audio stream

  51. };

  52. 

  53. typedef struct {

  54.     int nb_packets;

  55.     int old_format;

  56.     int current_stream;

  57.     int remaining_len;

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

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

  60. } RMDemuxContext;

  61. 

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

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

  64.     {  5, 81 }, {  7, 31 }, {  8, 86 }, {  9, 58 },

  65.     { 10, 36 }, { 12, 68 }, { 13, 39 }, { 14, 73 },

  66.     { 15, 53 }, { 16, 69 }, { 17, 57 }, { 19, 88 },

  67.     { 20, 34 }, { 21, 71 }, { 24, 46 }, { 25, 94 },

  68.     { 26, 54 }, { 28, 75 }, { 29, 50 }, { 32, 70 },

  69.     { 33, 92 }, { 35, 74 }, { 38, 85 }, { 40, 56 },

  70.     { 42, 87 }, { 43, 65 }, { 45, 59 }, { 48, 79 },

  71.     { 49, 93 }, { 51, 89 }, { 55, 95 }, { 61, 76 },

  72.     { 67, 83 }, { 77, 80 }

  73. };

  74. 

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

  76. 

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

  78. {

  79.     int i;

  80.     char *q, r;

  81. 

  82.     q = buf;

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

  84.         r = avio_r8(pb);

  85.         if (i < buf_size - 1)

  86.             *q++ = r;

  87.     }

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

  89. }

  90. 

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

  92. {

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

  94. }

  95. 

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

  97. {

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

  99.         return -1;

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

  101.     if (!avctx->extradata)

  102.         return AVERROR(ENOMEM);

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

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

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

  106.         return AVERROR(EIO);

  107.     return 0;

  108. }

  109. 

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

  111. {

  112.     char buf[1024];

  113.     int i;

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

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

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

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

  118.     }

  119. }

  120. 

  121. RMStream *ff_rm_alloc_rmstream (void)

  122. {

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

  124.     rms->curpic_num = -1;

  125.     return rms;

  126. }

  127. 

  128. void ff_rm_free_rmstream (RMStream *rms)

  129. {

  130.     av_free_packet(&rms->pkt);

  131. }

  132. 

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

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

  135. {

  136.     char buf[256];

  137.     uint32_t version;

  138.     int ret;

  139. 

  140.     /* ra type header */

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

  142.     if (version == 3) {

  143.         int header_size = avio_rb16(pb);

  144.         int64_t startpos = avio_tell(pb);

  145.         avio_skip(pb, 14);

  146.         rm_read_metadata(s, 0);

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

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

  149.             avio_r8(pb);

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

  151.         }

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

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

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

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

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

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

  158.         st->codec->codec_id = AV_CODEC_ID_RA_144;

  159.         ast->deint_id = DEINT_ID_INT0;

  160.     } else {

  161.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  162.         int codecdata_length;

  163.         /* old version (4) */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  178.         if (version == 5) {

  179.             avio_rb16(pb); avio_rb16(pb); avio_rb16(pb);

  180.         }

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

  182.         avio_rb32(pb);

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

  184.         if (version == 5) {

  185.             ast->deint_id = avio_rl32(pb);

  186.             avio_read(pb, buf, 4);

  187.             buf[4] = 0;

  188.         } else {

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

  190.             ast->deint_id = AV_RL32(buf);

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

  192.         }

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

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

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

  196.                                                 st->codec->codec_tag);

  197. 

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

  199.         case AV_CODEC_ID_AC3:

  200.             st->need_parsing = AVSTREAM_PARSE_FULL;

  201.             break;

  202.         case AV_CODEC_ID_RA_288:

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

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

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

  206.             break;

  207.         case AV_CODEC_ID_COOK:

  208.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  209.         case AV_CODEC_ID_ATRAC3:

  210.         case AV_CODEC_ID_SIPR:

  211.             avio_rb16(pb); avio_r8(pb);

  212.             if (version == 5)

  213.                 avio_r8(pb);

  214.             codecdata_length = avio_rb32(pb);

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

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

  217.                 return -1;

  218.             }

  219. 

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

  221.             if (st->codec->codec_id == AV_CODEC_ID_SIPR) {

  222.                 if (flavor > 3) {

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

  224.                            flavor);

  225.                     return -1;

  226.                 }

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

  228.             } else {

  229.                 if(sub_packet_size <= 0){

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

  231.                     return -1;

  232.                 }

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

  234.             }

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

  236.                 return ret;

  237.             break;

  238.         case AV_CODEC_ID_AAC:

  239.             avio_rb16(pb); avio_r8(pb);

  240.             if (version == 5)

  241.                 avio_r8(pb);

  242.             codecdata_length = avio_rb32(pb);

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

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

  245.                 return -1;

  246.             }

  247.             if (codecdata_length >= 1) {

  248.                 avio_r8(pb);

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

  250.                     return ret;

  251.             }

  252.             break;

  253.         default:

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

  255.         }

  256.         if (ast->deint_id == DEINT_ID_INT4 ||

  257.             ast->deint_id == DEINT_ID_GENR ||

  258.             ast->deint_id == DEINT_ID_SIPR) {

  259.             if (st->codec->block_align <= 0 ||

  260.                 ast->audio_framesize * sub_packet_h > (unsigned)INT_MAX ||

  261.                 ast->audio_framesize * sub_packet_h < st->codec->block_align)

  262.                 return AVERROR_INVALIDDATA;

  263.             if (av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h) < 0)

  264.                 return AVERROR(ENOMEM);

  265.         }

  266.         switch (ast->deint_id) {

  267.         case DEINT_ID_INT4:

  268.             if (ast->coded_framesize > ast->audio_framesize ||

  269.                 sub_packet_h <= 1 ||

  270.                 ast->coded_framesize * sub_packet_h > (2 + (sub_packet_h & 1)) * ast->audio_framesize)

  271.                 return AVERROR_INVALIDDATA;

  272.             break;

  273.         case DEINT_ID_GENR:

  274.             if (ast->sub_packet_size <= 0 ||

  275.                 ast->sub_packet_size > ast->audio_framesize)

  276.                 return AVERROR_INVALIDDATA;

  277.             break;

  278.         case DEINT_ID_SIPR:

  279.         case DEINT_ID_INT0:

  280.         case DEINT_ID_VBRS:

  281.         case DEINT_ID_VBRF:

  282.             break;

  283.         default:

  284.             av_log(NULL,0,"Unknown interleaver %X\n", ast->deint_id);

  285.             return AVERROR_INVALIDDATA;

  286.         }

  287. 

  288.         if (read_all) {

  289.             avio_r8(pb);

  290.             avio_r8(pb);

  291.             avio_r8(pb);

  292.             rm_read_metadata(s, 0);

  293.         }

  294.     }

  295.     return 0;

  296. }

  297. 

  298. int

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

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

  301. {

  302.     unsigned int v;

  303.     int size;

  304.     int64_t codec_pos;

  305.     int ret;

  306. 

  307.     avpriv_set_pts_info(st, 64, 1, 1000);

  308.     codec_pos = avio_tell(pb);

  309.     v = avio_rb32(pb);

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

  311.         /* ra type header */

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

  313.             return -1;

  314.     } else if (v == MKBETAG('L', 'S', 'D', ':')) {

  315.         avio_seek(pb, -4, SEEK_CUR);

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

  317.             return ret;

  318. 

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

  320.         st->codec->codec_tag  = AV_RL32(st->codec->extradata);

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

  322.                                                 st->codec->codec_tag);

  323.     } else {

  324.         int fps;

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

  326.         fail1:

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

  328.             goto skip;

  329.         }

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

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

  332.                                                st->codec->codec_tag);

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

  334.         if (st->codec->codec_id == AV_CODEC_ID_NONE)

  335.             goto fail1;

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

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

  338.         avio_skip(pb, 2); // looks like bits per sample

  339.         avio_skip(pb, 4); // always zero?

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

  341.         st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  342.         fps = avio_rb32(pb);

  343. 

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

  345.             return ret;

  346. 

  347.         av_reduce(&st->avg_frame_rate.den, &st->avg_frame_rate.num,

  348.                   0x10000, fps, (1 << 30) - 1);

  349. #if FF_API_R_FRAME_RATE

  350.         st->r_frame_rate = st->avg_frame_rate;

  351. #endif

  352.     }

  353. 

  354. skip:

  355.     /* skip codec info */

  356.     size = avio_tell(pb) - codec_pos;

  357.     avio_skip(pb, codec_data_size - size);

  358. 

  359.     return 0;

  360. }

  361. 

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

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

  364. static int rm_read_index(AVFormatContext *s)

  365. {

  366.     AVIOContext *pb = s->pb;

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

  368.     AVStream *st;

  369. 

  370.     do {

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

  372.             return -1;

  373.         size     = avio_rb32(pb);

  374.         if (size < 20)

  375.             return -1;

  376.         avio_skip(pb, 2);

  377.         n_pkts   = avio_rb32(pb);

  378.         str_id   = avio_rb16(pb);

  379.         next_off = avio_rb32(pb);

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

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

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

  383.                 break;

  384.             }

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

  386.             av_log(s, AV_LOG_ERROR,

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

  388.                    str_id, avio_tell(pb));

  389.             goto skip;

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

  391.             av_log(s, AV_LOG_ERROR,

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

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

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

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

  396.             goto skip;

  397.         }

  398. 

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

  400.             avio_skip(pb, 2);

  401.             pts = avio_rb32(pb);

  402.             pos = avio_rb32(pb);

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

  404. 

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

  406.         }

  407. 

  408. skip:

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

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

  411.             av_log(s, AV_LOG_ERROR,

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

  413.             return -1;

  414.         }

  415.     } while (next_off);

  416. 

  417.     return 0;

  418. }

  419. 

  420. static int rm_read_header_old(AVFormatContext *s)

  421. {

  422.     RMDemuxContext *rm = s->priv_data;

  423.     AVStream *st;

  424. 

  425.     rm->old_format = 1;

  426.     st = avformat_new_stream(s, NULL);

  427.     if (!st)

  428.         return -1;

  429.     st->priv_data = ff_rm_alloc_rmstream();

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

  431. }

  432. 

  433. static int rm_read_header(AVFormatContext *s)

  434. {

  435.     RMDemuxContext *rm = s->priv_data;

  436.     AVStream *st;

  437.     AVIOContext *pb = s->pb;

  438.     unsigned int tag;

  439.     int tag_size;

  440.     unsigned int start_time, duration;

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

  442.     char buf[128];

  443.     int flags = 0;

  444. 

  445.     tag = avio_rl32(pb);

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

  447.         /* very old .ra format */

  448.         return rm_read_header_old(s);

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

  450.         return AVERROR(EIO);

  451.     }

  452. 

  453.     tag_size = avio_rb32(pb);

  454.     avio_skip(pb, tag_size - 8);

  455. 

  456.     for(;;) {

  457.         if (pb->eof_reached)

  458.             return -1;

  459.         tag = avio_rl32(pb);

  460.         tag_size = avio_rb32(pb);

  461.         avio_rb16(pb);

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

  463.                 (tag      ) & 0xff,

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

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

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

  467.                 tag,

  468.                 tag_size);

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

  470.             return -1;

  471.         switch(tag) {

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

  473.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

  485.             break;

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

  487.             rm_read_metadata(s, 1);

  488.             break;

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

  490.             st = avformat_new_stream(s, NULL);

  491.             if (!st)

  492.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  501.             st->start_time = start_time;

  502.             st->duration = duration;

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

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

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

  506.             st->priv_data = ff_rm_alloc_rmstream();

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

  508.                                           avio_rb32(pb)) < 0)

  509.                 return -1;

  510.             break;

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

  512.             goto header_end;

  513.         default:

  514.             /* unknown tag: skip it */

  515.             avio_skip(pb, tag_size - 10);

  516.             break;

  517.         }

  518.     }

  519.  header_end:

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

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

  522.         rm->nb_packets = 3600 * 25;

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

  524. 

  525.     if (!data_off)

  526.         data_off = avio_tell(pb) - 18;

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

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

  529.         rm_read_index(s);

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

  531.     }

  532. 

  533.     return 0;

  534. }

  535. 

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

  537. {

  538.     int n, n1;

  539. 

  540.     n = avio_rb16(pb);

  541.     (*len)-=2;

  542.     n &= 0x7FFF;

  543.     if (n >= 0x4000) {

  544.         return n - 0x4000;

  545.     } else {

  546.         n1 = avio_rb16(pb);

  547.         (*len)-=2;

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

  549.     }

  550. }

  551. 

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

  553. #define RAW_PACKET_SIZE 1000

  554. 

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

  556.     RMDemuxContext *rm = s->priv_data;

  557.     AVIOContext *pb = s->pb;

  558.     AVStream *st;

  559.     uint32_t state=0xFFFFFFFF;

  560. 

  561.     while(!pb->eof_reached){

  562.         int len, num, i;

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

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

  565.             num= rm->current_stream;

  566.             len= rm->remaining_len;

  567.             *timestamp = AV_NOPTS_VALUE;

  568.             *flags= 0;

  569.         }else{

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

  571. 

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

  573.                 int n_pkts, expected_len;

  574.                 len = avio_rb32(pb);

  575.                 avio_skip(pb, 2);

  576.                 n_pkts = avio_rb32(pb);

  577.                 expected_len = 20 + n_pkts * 14;

  578.                 if (len == 20)

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

  580.                     len = expected_len;

  581.                 else if (len != expected_len)

  582.                     av_log(s, AV_LOG_WARNING,

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

  584.                            len, n_pkts, expected_len);

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

  586.                 if(len<0)

  587.                     continue;

  588.                 goto skip;

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

  590.                 av_log(s, AV_LOG_WARNING,

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

  592.             }

  593. 

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

  595.                 continue;

  596.             len=state - 12;

  597.             state= 0xFFFFFFFF;

  598. 

  599.             num = avio_rb16(pb);

  600.             *timestamp = avio_rb32(pb);

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

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

  603.         }

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

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

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

  607.                 break;

  608.         }

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

  610. skip:

  611.             /* skip packet if unknown number */

  612.             avio_skip(pb, len);

  613.             rm->remaining_len = 0;

  614.             continue;

  615.         }

  616.         *stream_index= i;

  617. 

  618.         return len;

  619.     }

  620.     return -1;

  621. }

  622. 

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

  624.                                    RMDemuxContext *rm, RMStream *vst,

  625.                                    AVPacket *pkt, int len, int *pseq,

  626.                                    int64_t *timestamp)

  627. {

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

  629.     int type;

  630. 

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

  632.     type = hdr >> 6;

  633. 

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

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

  636.     }

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

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

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

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

  641.     }

  642.     if(len<0)

  643.         return -1;

  644.     rm->remaining_len = len;

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

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

  647.             len= len2;

  648.             *timestamp = pos;

  649.         }

  650.         if(rm->remaining_len < len)

  651.             return -1;

  652.         rm->remaining_len -= len;

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

  654.             return AVERROR(EIO);

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

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

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

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

  659.         return 0;

  660.     }

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

  662. 

  663.     *pseq = seq;

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

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

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

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

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

  669.             return AVERROR(ENOMEM);

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

  671.         vst->cur_slice = 0;

  672.         vst->curpic_num = pic_num;

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

  674.     }

  675.     if(type == 2)

  676.         len = FFMIN(len, pos);

  677. 

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

  679.         return 1;

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

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

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

  683.         return 1;

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

  685.         return AVERROR(EIO);

  686.     vst->videobufpos += len;

  687.     rm->remaining_len-= len;

  688. 

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

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

  691.         *pkt= vst->pkt;

  692.         vst->pkt.data= NULL;

  693.         vst->pkt.size= 0;

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

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

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

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

  698.         pkt->pts = AV_NOPTS_VALUE;

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

  700.         vst->slices = 0;

  701.         return 0;

  702.     }

  703. 

  704.     return 1;

  705. }

  706. 

  707. static inline void

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

  709. {

  710.     uint8_t *ptr;

  711.     int j;

  712. 

  713.     if (st->codec->codec_id == AV_CODEC_ID_AC3) {

  714.         ptr = pkt->data;

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

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

  717.             ptr += 2;

  718.         }

  719.     }

  720. }

  721. 

  722. /**

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

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

  725.  */

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

  727. {

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

  729. 

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

  731.         int j;

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

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

  734. 

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

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

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

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

  739. 

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

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

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

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

  744.         }

  745.     }

  746. }

  747. 

  748. int

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

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

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

  752. {

  753.     RMDemuxContext *rm = s->priv_data;

  754. 

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

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

  757.         if(rm_assemble_video_frame(s, pb, rm, ast, pkt, len, seq, &timestamp))

  758.             return -1; //got partial frame

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

  760.         if ((ast->deint_id == DEINT_ID_GENR) ||

  761.             (ast->deint_id == DEINT_ID_INT4) ||

  762.             (ast->deint_id == DEINT_ID_SIPR)) {

  763.             int x;

  764.             int sps = ast->sub_packet_size;

  765.             int cfs = ast->coded_framesize;

  766.             int h = ast->sub_packet_h;

  767.             int y = ast->sub_packet_cnt;

  768.             int w = ast->audio_framesize;

  769. 

  770.             if (flags & 2)

  771.                 y = ast->sub_packet_cnt = 0;

  772.             if (!y)

  773.                 ast->audiotimestamp = timestamp;

  774. 

  775.             switch (ast->deint_id) {

  776.                 case DEINT_ID_INT4:

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

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

  779.                     break;

  780.                 case DEINT_ID_GENR:

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

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

  783.                     break;

  784.                 case DEINT_ID_SIPR:

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

  786.                     break;

  787.             }

  788. 

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

  790.                 return -1;

  791.             if (ast->deint_id == DEINT_ID_SIPR)

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

  793. 

  794.              ast->sub_packet_cnt = 0;

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

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

  797.         } else if ((ast->deint_id == DEINT_ID_VBRF) ||

  798.                    (ast->deint_id == DEINT_ID_VBRS)) {

  799.             int x;

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

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

  802.             if (ast->sub_packet_cnt) {

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

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

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

  806.                 ast->audiotimestamp = timestamp;

  807.             } else

  808.                 return -1;

  809.         } else {

  810.             av_get_packet(pb, pkt, len);

  811.             rm_ac3_swap_bytes(st, pkt);

  812.         }

  813.     } else

  814.         av_get_packet(pb, pkt, len);

  815. 

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

  817. 

  818. #if 0

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

  820.         if(st->codec->codec_id == AV_CODEC_ID_RV20){

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

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

  823. 

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

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

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

  827.         }

  828.     }

  829. #endif

  830. 

  831.     pkt->pts = timestamp;

  832.     if (flags & 2)

  833.         pkt->flags |= AV_PKT_FLAG_KEY;

  834. 

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

  836. }

  837. 

  838. int

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

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

  841. {

  842.     RMDemuxContext *rm = s->priv_data;

  843. 

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

  845. 

  846.     if (ast->deint_id == DEINT_ID_VBRF ||

  847.         ast->deint_id == DEINT_ID_VBRS)

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

  849.     else {

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

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

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

  853.                st->codec->block_align);

  854.     }

  855.     rm->audio_pkt_cnt--;

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

  857.         ast->audiotimestamp = AV_NOPTS_VALUE;

  858.         pkt->flags = AV_PKT_FLAG_KEY;

  859.     } else

  860.         pkt->flags = 0;

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

  862. 

  863.     return rm->audio_pkt_cnt;

  864. }

  865. 

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

  867. {

  868.     RMDemuxContext *rm = s->priv_data;

  869.     AVStream *st;

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

  871.     int64_t timestamp, pos;

  872.     int flags;

  873. 

  874.     for (;;) {

  875.         if (rm->audio_pkt_cnt) {

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

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

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

  879.             flags = 0;

  880.         } else {

  881.             if (rm->old_format) {

  882.                 RMStream *ast;

  883. 

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

  885.                 ast = st->priv_data;

  886.                 timestamp = AV_NOPTS_VALUE;

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

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

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

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

  891.             } else {

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

  893.                 if (len > 0)

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

  895.             }

  896. 

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

  898.                 return AVERROR(EIO);

  899. 

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

  901.                                       &seq, flags, timestamp);

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

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

  904.             if (res)

  905.                 continue;

  906.         }

  907. 

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

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

  910.             av_free_packet(pkt);

  911.         } else

  912.             break;

  913.     }

  914. 

  915.     return 0;

  916. }

  917. 

  918. static int rm_read_close(AVFormatContext *s)

  919. {

  920.     int i;

  921. 

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

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

  924. 

  925.     return 0;

  926. }

  927. 

  928. static int rm_probe(AVProbeData *p)

  929. {

  930.     /* check file header */

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

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

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

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

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

  936.         return AVPROBE_SCORE_MAX;

  937.     else

  938.         return 0;

  939. }

  940. 

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

  942.                                int64_t *ppos, int64_t pos_limit)

  943. {

  944.     RMDemuxContext *rm = s->priv_data;

  945.     int64_t pos, dts;

  946.     int stream_index2, flags, len, h;

  947. 

  948.     pos = *ppos;

  949. 

  950.     if(rm->old_format)

  951.         return AV_NOPTS_VALUE;

  952. 

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

  954.     rm->remaining_len=0;

  955.     for(;;){

  956.         int seq=1;

  957.         AVStream *st;

  958. 

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

  960.         if(len<0)

  961.             return AV_NOPTS_VALUE;

  962. 

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

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

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

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

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

  968.             }

  969.         }

  970. 

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

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

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

  974.             if(stream_index2 == stream_index)

  975.                 break;

  976.         }

  977. 

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

  979.     }

  980.     *ppos = pos;

  981.     return dts;

  982. }

  983. 

  984. AVInputFormat ff_rm_demuxer = {

  985.     .name           = "rm",

  986.     .long_name      = NULL_IF_CONFIG_SMALL("RealMedia"),

  987.     .priv_data_size = sizeof(RMDemuxContext),

  988.     .read_probe     = rm_probe,

  989.     .read_header    = rm_read_header,

  990.     .read_packet    = rm_read_packet,

  991.     .read_close     = rm_read_close,

  992.     .read_timestamp = rm_read_dts,

  993. };

  994. 

  995. AVInputFormat ff_rdt_demuxer = {

  996.     .name           = "rdt",

  997.     .long_name      = NULL_IF_CONFIG_SMALL("RDT demuxer"),

  998.     .priv_data_size = sizeof(RMDemuxContext),

  999.     .read_close     = rm_read_close,

  1000.     .flags          = AVFMT_NOFILE,

  1001. };