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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 = 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 CODEC_ID_AC3:

  200.             st->need_parsing = AVSTREAM_PARSE_FULL;

  201.             break;

  202.         case 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 CODEC_ID_COOK:

  208.         case CODEC_ID_ATRAC3:

  209.         case CODEC_ID_SIPR:

  210.             avio_rb16(pb); avio_r8(pb);

  211.             if (version == 5)

  212.                 avio_r8(pb);

  213.             codecdata_length = avio_rb32(pb);

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

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

  216.                 return -1;

  217.             }

  218. 

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

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

  221.                 if (flavor > 3) {

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

  223.                            flavor);

  224.                     return -1;

  225.                 }

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

  227.             } else {

  228.                 if(sub_packet_size <= 0){

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

  230.                     return -1;

  231.                 }

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

  233.             }

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

  235.                 return ret;

  236.             break;

  237.         case CODEC_ID_AAC:

  238.             avio_rb16(pb); avio_r8(pb);

  239.             if (version == 5)

  240.                 avio_r8(pb);

  241.             codecdata_length = avio_rb32(pb);

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

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

  244.                 return -1;

  245.             }

  246.             if (codecdata_length >= 1) {

  247.                 avio_r8(pb);

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

  249.                     return ret;

  250.             }

  251.             break;

  252.         default:

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

  254.         }

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

  256.             ast->deint_id == DEINT_ID_GENR ||

  257.             ast->deint_id == DEINT_ID_SIPR) {

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

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

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

  261.                 return AVERROR_INVALIDDATA;

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

  263.                 return AVERROR(ENOMEM);

  264.         }

  265.         switch (ast->deint_id) {

  266.         case DEINT_ID_INT4:

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

  268.                 sub_packet_h <= 1 ||

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

  270.                 return AVERROR_INVALIDDATA;

  271.             break;

  272.         case DEINT_ID_GENR:

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

  274.                 ast->sub_packet_size > ast->audio_framesize)

  275.                 return AVERROR_INVALIDDATA;

  276.             break;

  277.         case DEINT_ID_SIPR:

  278.         case DEINT_ID_INT0:

  279.         case DEINT_ID_VBRS:

  280.         case DEINT_ID_VBRF:

  281.             break;

  282.         default:

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

  284.             return AVERROR_INVALIDDATA;

  285.         }

  286. 

  287.         if (read_all) {

  288.             avio_r8(pb);

  289.             avio_r8(pb);

  290.             avio_r8(pb);

  291.             rm_read_metadata(s, 0);

  292.         }

  293.     }

  294.     return 0;

  295. }

  296. 

  297. int

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

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

  300. {

  301.     unsigned int v;

  302.     int size;

  303.     int64_t codec_pos;

  304.     int ret;

  305. 

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

  307.     codec_pos = avio_tell(pb);

  308.     v = avio_rb32(pb);

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

  310.         /* ra type header */

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

  312.             return -1;

  313.     } else {

  314.         int fps;

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

  316.         fail1:

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

  318.             goto skip;

  319.         }

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

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

  322.                                                st->codec->codec_tag);

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

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

  325.             goto fail1;

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

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

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

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

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

  331.         st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  332.         fps = avio_rb32(pb);

  333. 

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

  335.             return ret;

  336. 

  337.         av_reduce(&st->r_frame_rate.den, &st->r_frame_rate.num,

  338.                   0x10000, fps, (1 << 30) - 1);

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

  340.     }

  341. 

  342. skip:

  343.     /* skip codec info */

  344.     size = avio_tell(pb) - codec_pos;

  345.     avio_skip(pb, codec_data_size - size);

  346. 

  347.     return 0;

  348. }

  349. 

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

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

  352. static int rm_read_index(AVFormatContext *s)

  353. {

  354.     AVIOContext *pb = s->pb;

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

  356.     AVStream *st;

  357. 

  358.     do {

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

  360.             return -1;

  361.         size     = avio_rb32(pb);

  362.         if (size < 20)

  363.             return -1;

  364.         avio_skip(pb, 2);

  365.         n_pkts   = avio_rb32(pb);

  366.         str_id   = avio_rb16(pb);

  367.         next_off = avio_rb32(pb);

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

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

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

  371.                 break;

  372.             }

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

  374.             goto skip;

  375. 

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

  377.             avio_skip(pb, 2);

  378.             pts = avio_rb32(pb);

  379.             pos = avio_rb32(pb);

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

  381. 

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

  383.         }

  384. 

  385. skip:

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

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

  388.             return -1;

  389.     } while (next_off);

  390. 

  391.     return 0;

  392. }

  393. 

  394. static int rm_read_header_old(AVFormatContext *s)

  395. {

  396.     RMDemuxContext *rm = s->priv_data;

  397.     AVStream *st;

  398. 

  399.     rm->old_format = 1;

  400.     st = avformat_new_stream(s, NULL);

  401.     if (!st)

  402.         return -1;

  403.     st->priv_data = ff_rm_alloc_rmstream();

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

  405. }

  406. 

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

  408. {

  409.     RMDemuxContext *rm = s->priv_data;

  410.     AVStream *st;

  411.     AVIOContext *pb = s->pb;

  412.     unsigned int tag;

  413.     int tag_size;

  414.     unsigned int start_time, duration;

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

  416.     char buf[128];

  417.     int flags = 0;

  418. 

  419.     tag = avio_rl32(pb);

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

  421.         /* very old .ra format */

  422.         return rm_read_header_old(s);

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

  424.         return AVERROR(EIO);

  425.     }

  426. 

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

  428.     avio_rb16(pb);

  429.     avio_rb32(pb);

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

  431. 

  432.     for(;;) {

  433.         if (pb->eof_reached)

  434.             return -1;

  435.         tag = avio_rl32(pb);

  436.         tag_size = avio_rb32(pb);

  437.         avio_rb16(pb);

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

  439.                 (tag      ) & 0xff,

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

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

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

  443.                 tag,

  444.                 tag_size);

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

  446.             return -1;

  447.         switch(tag) {

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

  449.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

  461.             break;

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

  463.             rm_read_metadata(s, 1);

  464.             break;

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

  466.             st = avformat_new_stream(s, NULL);

  467.             if (!st)

  468.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  477.             st->start_time = start_time;

  478.             st->duration = duration;

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

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

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

  482.             st->priv_data = ff_rm_alloc_rmstream();

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

  484.                                           avio_rb32(pb)) < 0)

  485.                 return -1;

  486.             break;

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

  488.             goto header_end;

  489.         default:

  490.             /* unknown tag: skip it */

  491.             avio_skip(pb, tag_size - 10);

  492.             break;

  493.         }

  494.     }

  495.  header_end:

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

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

  498.         rm->nb_packets = 3600 * 25;

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

  500. 

  501.     if (!data_off)

  502.         data_off = avio_tell(pb) - 18;

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

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

  505.         rm_read_index(s);

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

  507.     }

  508. 

  509.     return 0;

  510. }

  511. 

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

  513. {

  514.     int n, n1;

  515. 

  516.     n = avio_rb16(pb);

  517.     (*len)-=2;

  518.     n &= 0x7FFF;

  519.     if (n >= 0x4000) {

  520.         return n - 0x4000;

  521.     } else {

  522.         n1 = avio_rb16(pb);

  523.         (*len)-=2;

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

  525.     }

  526. }

  527. 

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

  529. #define RAW_PACKET_SIZE 1000

  530. 

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

  532.     RMDemuxContext *rm = s->priv_data;

  533.     AVIOContext *pb = s->pb;

  534.     AVStream *st;

  535.     uint32_t state=0xFFFFFFFF;

  536. 

  537.     while(!pb->eof_reached){

  538.         int len, num, i;

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

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

  541.             num= rm->current_stream;

  542.             len= rm->remaining_len;

  543.             *timestamp = AV_NOPTS_VALUE;

  544.             *flags= 0;

  545.         }else{

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

  547. 

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

  549.                 int n_pkts, expected_len;

  550.                 len = avio_rb32(pb);

  551.                 avio_skip(pb, 2);

  552.                 n_pkts = avio_rb32(pb);

  553.                 expected_len = 20 + n_pkts * 14;

  554.                 if (len == 20)

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

  556.                     len = expected_len;

  557.                 else if (len != expected_len)

  558.                     av_log(s, AV_LOG_WARNING,

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

  560.                            len, n_pkts, expected_len);

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

  562.                 if(len<0)

  563.                     continue;

  564.                 goto skip;

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

  566.                 av_log(s, AV_LOG_WARNING,

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

  568.             }

  569. 

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

  571.                 continue;

  572.             len=state - 12;

  573.             state= 0xFFFFFFFF;

  574. 

  575.             num = avio_rb16(pb);

  576.             *timestamp = avio_rb32(pb);

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

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

  579.         }

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

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

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

  583.                 break;

  584.         }

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

  586. skip:

  587.             /* skip packet if unknown number */

  588.             avio_skip(pb, len);

  589.             rm->remaining_len = 0;

  590.             continue;

  591.         }

  592.         *stream_index= i;

  593. 

  594.         return len;

  595.     }

  596.     return -1;

  597. }

  598. 

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

  600.                                    RMDemuxContext *rm, RMStream *vst,

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

  602.                                    int64_t *timestamp)

  603. {

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

  605.     int type;

  606. 

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

  608.     type = hdr >> 6;

  609. 

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

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

  612.     }

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

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

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

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

  617.     }

  618.     if(len<0)

  619.         return -1;

  620.     rm->remaining_len = len;

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

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

  623.             len= len2;

  624.             *timestamp = pos;

  625.         }

  626.         if(rm->remaining_len < len)

  627.             return -1;

  628.         rm->remaining_len -= len;

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

  630.             return AVERROR(EIO);

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

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

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

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

  635.         return 0;

  636.     }

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

  638. 

  639.     *pseq = seq;

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

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

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

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

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

  645.             return AVERROR(ENOMEM);

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

  647.         vst->cur_slice = 0;

  648.         vst->curpic_num = pic_num;

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

  650.     }

  651.     if(type == 2)

  652.         len = FFMIN(len, pos);

  653. 

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

  655.         return 1;

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

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

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

  659.         return 1;

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

  661.         return AVERROR(EIO);

  662.     vst->videobufpos += len;

  663.     rm->remaining_len-= len;

  664. 

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

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

  667.         *pkt= vst->pkt;

  668.         vst->pkt.data= NULL;

  669.         vst->pkt.size= 0;

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

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

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

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

  674.         pkt->pts = AV_NOPTS_VALUE;

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

  676.         vst->slices = 0;

  677.         return 0;

  678.     }

  679. 

  680.     return 1;

  681. }

  682. 

  683. static inline void

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

  685. {

  686.     uint8_t *ptr;

  687.     int j;

  688. 

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

  690.         ptr = pkt->data;

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

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

  693.             ptr += 2;

  694.         }

  695.     }

  696. }

  697. 

  698. /**

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

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

  701.  */

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

  703. {

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

  705. 

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

  707.         int j;

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

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

  710. 

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

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

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

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

  715. 

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

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

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

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

  720.         }

  721.     }

  722. }

  723. 

  724. int

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

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

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

  728. {

  729.     RMDemuxContext *rm = s->priv_data;

  730. 

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

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

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

  734.             return -1; //got partial frame

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

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

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

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

  739.             int x;

  740.             int sps = ast->sub_packet_size;

  741.             int cfs = ast->coded_framesize;

  742.             int h = ast->sub_packet_h;

  743.             int y = ast->sub_packet_cnt;

  744.             int w = ast->audio_framesize;

  745. 

  746.             if (flags & 2)

  747.                 y = ast->sub_packet_cnt = 0;

  748.             if (!y)

  749.                 ast->audiotimestamp = timestamp;

  750. 

  751.             switch (ast->deint_id) {

  752.                 case DEINT_ID_INT4:

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

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

  755.                     break;

  756.                 case DEINT_ID_GENR:

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

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

  759.                     break;

  760.                 case DEINT_ID_SIPR:

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

  762.                     break;

  763.             }

  764. 

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

  766.                 return -1;

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

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

  769. 

  770.              ast->sub_packet_cnt = 0;

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

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

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

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

  775.             int x;

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

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

  778.             if (ast->sub_packet_cnt) {

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

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

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

  782.                 ast->audiotimestamp = timestamp;

  783.             } else

  784.                 return -1;

  785.         } else {

  786.             av_get_packet(pb, pkt, len);

  787.             rm_ac3_swap_bytes(st, pkt);

  788.         }

  789.     } else

  790.         av_get_packet(pb, pkt, len);

  791. 

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

  793. 

  794. #if 0

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

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

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

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

  799. 

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

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

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

  803.         }

  804.     }

  805. #endif

  806. 

  807.     pkt->pts = timestamp;

  808.     if (flags & 2)

  809.         pkt->flags |= AV_PKT_FLAG_KEY;

  810. 

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

  812. }

  813. 

  814. int

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

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

  817. {

  818.     RMDemuxContext *rm = s->priv_data;

  819. 

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

  821. 

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

  823.         ast->deint_id == DEINT_ID_VBRS)

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

  825.     else {

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

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

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

  829.                st->codec->block_align);

  830.     }

  831.     rm->audio_pkt_cnt--;

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

  833.         ast->audiotimestamp = AV_NOPTS_VALUE;

  834.         pkt->flags = AV_PKT_FLAG_KEY;

  835.     } else

  836.         pkt->flags = 0;

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

  838. 

  839.     return rm->audio_pkt_cnt;

  840. }

  841. 

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

  843. {

  844.     RMDemuxContext *rm = s->priv_data;

  845.     AVStream *st;

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

  847.     int64_t timestamp, pos;

  848.     int flags;

  849. 

  850.     for (;;) {

  851.         if (rm->audio_pkt_cnt) {

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

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

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

  855.             flags = 0;

  856.         } else {

  857.             if (rm->old_format) {

  858.                 RMStream *ast;

  859. 

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

  861.                 ast = st->priv_data;

  862.                 timestamp = AV_NOPTS_VALUE;

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

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

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

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

  867.             } else {

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

  869.                 if (len > 0)

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

  871.             }

  872. 

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

  874.                 return AVERROR(EIO);

  875. 

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

  877.                                       &seq, flags, timestamp);

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

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

  880.             if (res)

  881.                 continue;

  882.         }

  883. 

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

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

  886.             av_free_packet(pkt);

  887.         } else

  888.             break;

  889.     }

  890. 

  891.     return 0;

  892. }

  893. 

  894. static int rm_read_close(AVFormatContext *s)

  895. {

  896.     int i;

  897. 

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

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

  900. 

  901.     return 0;

  902. }

  903. 

  904. static int rm_probe(AVProbeData *p)

  905. {

  906.     /* check file header */

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

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

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

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

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

  912.         return AVPROBE_SCORE_MAX;

  913.     else

  914.         return 0;

  915. }

  916. 

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

  918.                                int64_t *ppos, int64_t pos_limit)

  919. {

  920.     RMDemuxContext *rm = s->priv_data;

  921.     int64_t pos, dts;

  922.     int stream_index2, flags, len, h;

  923. 

  924.     pos = *ppos;

  925. 

  926.     if(rm->old_format)

  927.         return AV_NOPTS_VALUE;

  928. 

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

  930.     rm->remaining_len=0;

  931.     for(;;){

  932.         int seq=1;

  933.         AVStream *st;

  934. 

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

  936.         if(len<0)

  937.             return AV_NOPTS_VALUE;

  938. 

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

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

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

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

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

  944.             }

  945.         }

  946. 

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

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

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

  950.             if(stream_index2 == stream_index)

  951.                 break;

  952.         }

  953. 

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

  955.     }

  956.     *ppos = pos;

  957.     return dts;

  958. }

  959. 

  960. AVInputFormat ff_rm_demuxer = {

  961.     .name           = "rm",

  962.     .long_name      = NULL_IF_CONFIG_SMALL("RealMedia format"),

  963.     .priv_data_size = sizeof(RMDemuxContext),

  964.     .read_probe     = rm_probe,

  965.     .read_header    = rm_read_header,

  966.     .read_packet    = rm_read_packet,

  967.     .read_close     = rm_read_close,

  968.     .read_timestamp = rm_read_dts,

  969. };

  970. 

  971. AVInputFormat ff_rdt_demuxer = {

  972.     .name           = "rdt",

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

  974.     .priv_data_size = sizeof(RMDemuxContext),

  975.     .read_close     = rm_read_close,

  976.     .flags          = AVFMT_NOFILE,

  977. };