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FFmpeg/libavformat/rmdec.c

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  1. /*

  2.  * "Real" compatible demuxer.

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

  4.  *

  5.  * This file is part of Libav.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. #include "libavutil/avstring.h"

  23. #include "libavutil/intreadwrite.h"

  24. #include "libavutil/dict.h"

  25. #include "avformat.h"

  26. #include "riff.h"

  27. #include "rm.h"

  28. 

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

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

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

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

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

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

  35. 

  36. struct RMStream {

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

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

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

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

  41.     int cur_slice, slices;

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

  43.     /// Audio descrambling matrix parameters

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

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

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

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

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

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

  50. };

  51. 

  52. typedef struct {

  53.     int nb_packets;

  54.     int old_format;

  55.     int current_stream;

  56.     int remaining_len;

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

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

  59. } RMDemuxContext;

  60. 

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

  62.     {  0, 63 }, {  1, 22 }, {  2, 44 }, {  3, 90 },

  63.     {  5, 81 }, {  7, 31 }, {  8, 86 }, {  9, 58 },

  64.     { 10, 36 }, { 12, 68 }, { 13, 39 }, { 14, 73 },

  65.     { 15, 53 }, { 16, 69 }, { 17, 57 }, { 19, 88 },

  66.     { 20, 34 }, { 21, 71 }, { 24, 46 }, { 25, 94 },

  67.     { 26, 54 }, { 28, 75 }, { 29, 50 }, { 32, 70 },

  68.     { 33, 92 }, { 35, 74 }, { 38, 85 }, { 40, 56 },

  69.     { 42, 87 }, { 43, 65 }, { 45, 59 }, { 48, 79 },

  70.     { 49, 93 }, { 51, 89 }, { 55, 95 }, { 61, 76 },

  71.     { 67, 83 }, { 77, 80 }

  72. };

  73. 

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

  75. 

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

  77. {

  78.     int i;

  79.     char *q, r;

  80. 

  81.     q = buf;

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

  83.         r = avio_r8(pb);

  84.         if (i < buf_size - 1)

  85.             *q++ = r;

  86.     }

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

  88. }

  89. 

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

  91. {

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

  93. }

  94. 

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

  96. {

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

  98.         return -1;

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

  100.     if (!avctx->extradata)

  101.         return AVERROR(ENOMEM);

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

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

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

  105.         return AVERROR(EIO);

  106.     return 0;

  107. }

  108. 

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

  110. {

  111.     char buf[1024];

  112.     int i;

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

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

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

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

  117.     }

  118. }

  119. 

  120. RMStream *ff_rm_alloc_rmstream (void)

  121. {

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

  123.     rms->curpic_num = -1;

  124.     return rms;

  125. }

  126. 

  127. void ff_rm_free_rmstream (RMStream *rms)

  128. {

  129.     av_free_packet(&rms->pkt);

  130. }

  131. 

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

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

  134. {

  135.     char buf[256];

  136.     uint32_t version;

  137.     int ret;

  138. 

  139.     /* ra type header */

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

  141.     if (version == 3) {

  142.         int header_size = avio_rb16(pb);

  143.         int64_t startpos = avio_tell(pb);

  144.         avio_skip(pb, 14);

  145.         rm_read_metadata(s, 0);

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

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

  148.             avio_r8(pb);

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

  150.         }

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

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

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

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

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

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

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

  158.         ast->deint_id = DEINT_ID_INT0;

  159.     } else {

  160.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  161.         int codecdata_length;

  162.         /* old version (4) */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  177.         if (version == 5) {

  178.             avio_rb16(pb); avio_rb16(pb); avio_rb16(pb);

  179.         }

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

  181.         avio_rb32(pb);

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

  183.         if (version == 5) {

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

  185.             avio_read(pb, buf, 4);

  186.             buf[4] = 0;

  187.         } else {

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

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

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

  191.         }

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

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

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

  195.                                                 st->codec->codec_tag);

  196. 

  197.         switch (ast->deint_id) {

  198.         case DEINT_ID_GENR:

  199.         case DEINT_ID_INT0:

  200.         case DEINT_ID_INT4:

  201.         case DEINT_ID_SIPR:

  202.         case DEINT_ID_VBRS:

  203.         case DEINT_ID_VBRF:

  204.             break;

  205.         default:

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

  207.             return AVERROR_INVALIDDATA;

  208.         }

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

  210.         case CODEC_ID_AC3:

  211.             st->need_parsing = AVSTREAM_PARSE_FULL;

  212.             break;

  213.         case CODEC_ID_RA_288:

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

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

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

  217. 

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

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

  220.                 return -1;

  221.             }

  222. 

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

  224.             break;

  225.         case CODEC_ID_COOK:

  226.         case CODEC_ID_ATRAC3:

  227.         case CODEC_ID_SIPR:

  228.             avio_rb16(pb); avio_r8(pb);

  229.             if (version == 5)

  230.                 avio_r8(pb);

  231.             codecdata_length = avio_rb32(pb);

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

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

  234.                 return -1;

  235.             }

  236. 

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

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

  239.                 if (flavor > 3) {

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

  241.                            flavor);

  242.                     return -1;

  243.                 }

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

  245.             } else {

  246.                 if(sub_packet_size <= 0){

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

  248.                     return -1;

  249.                 }

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

  251.             }

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

  253.                 return ret;

  254. 

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

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

  257.                 return -1;

  258.             }

  259. 

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

  261.             break;

  262.         case CODEC_ID_AAC:

  263.             avio_rb16(pb); avio_r8(pb);

  264.             if (version == 5)

  265.                 avio_r8(pb);

  266.             codecdata_length = avio_rb32(pb);

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

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

  269.                 return -1;

  270.             }

  271.             if (codecdata_length >= 1) {

  272.                 avio_r8(pb);

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

  274.                     return ret;

  275.             }

  276.             break;

  277.         default:

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

  279.         }

  280.         if (read_all) {

  281.             avio_r8(pb);

  282.             avio_r8(pb);

  283.             avio_r8(pb);

  284.             rm_read_metadata(s, 0);

  285.         }

  286.     }

  287.     return 0;

  288. }

  289. 

  290. int

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

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

  293. {

  294.     unsigned int v;

  295.     int size;

  296.     int64_t codec_pos;

  297.     int ret;

  298. 

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

  300.     codec_pos = avio_tell(pb);

  301.     v = avio_rb32(pb);

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

  303.         /* ra type header */

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

  305.             return -1;

  306.     } else {

  307.         int fps;

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

  309.         fail1:

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

  311.             goto skip;

  312.         }

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

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

  315.                                                st->codec->codec_tag);

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

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

  318.             goto fail1;

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

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

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

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

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

  324.         st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  325.         fps = avio_rb32(pb);

  326. 

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

  328.             return ret;

  329. 

  330.         av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,

  331.                   0x10000, fps, (1 << 30) - 1);

  332.         st->avg_frame_rate.num = st->codec->time_base.den;

  333.         st->avg_frame_rate.den = st->codec->time_base.num;

  334.     }

  335. 

  336. skip:

  337.     /* skip codec info */

  338.     size = avio_tell(pb) - codec_pos;

  339.     avio_skip(pb, codec_data_size - size);

  340. 

  341.     return 0;

  342. }

  343. 

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

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

  346. static int rm_read_index(AVFormatContext *s)

  347. {

  348.     AVIOContext *pb = s->pb;

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

  350.     AVStream *st;

  351. 

  352.     do {

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

  354.             return -1;

  355.         size     = avio_rb32(pb);

  356.         if (size < 20)

  357.             return -1;

  358.         avio_skip(pb, 2);

  359.         n_pkts   = avio_rb32(pb);

  360.         str_id   = avio_rb16(pb);

  361.         next_off = avio_rb32(pb);

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

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

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

  365.                 break;

  366.             }

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

  368.             goto skip;

  369. 

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

  371.             avio_skip(pb, 2);

  372.             pts = avio_rb32(pb);

  373.             pos = avio_rb32(pb);

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

  375. 

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

  377.         }

  378. 

  379. skip:

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

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

  382.             return -1;

  383.     } while (next_off);

  384. 

  385.     return 0;

  386. }

  387. 

  388. static int rm_read_header_old(AVFormatContext *s)

  389. {

  390.     RMDemuxContext *rm = s->priv_data;

  391.     AVStream *st;

  392. 

  393.     rm->old_format = 1;

  394.     st = av_new_stream(s, 0);

  395.     if (!st)

  396.         return -1;

  397.     st->priv_data = ff_rm_alloc_rmstream();

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

  399. }

  400. 

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

  402. {

  403.     RMDemuxContext *rm = s->priv_data;

  404.     AVStream *st;

  405.     AVIOContext *pb = s->pb;

  406.     unsigned int tag;

  407.     int tag_size;

  408.     unsigned int start_time, duration;

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

  410.     char buf[128];

  411.     int flags = 0;

  412. 

  413.     tag = avio_rl32(pb);

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

  415.         /* very old .ra format */

  416.         return rm_read_header_old(s);

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

  418.         return AVERROR(EIO);

  419.     }

  420. 

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

  422.     avio_rb16(pb);

  423.     avio_rb32(pb);

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

  425. 

  426.     for(;;) {

  427.         if (pb->eof_reached)

  428.             return -1;

  429.         tag = avio_rl32(pb);

  430.         tag_size = avio_rb32(pb);

  431.         avio_rb16(pb);

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

  433.                 (tag      ) & 0xff,

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

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

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

  437.                 tag,

  438.                 tag_size);

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

  440.             return -1;

  441.         switch(tag) {

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

  443.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

  455.             break;

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

  457.             rm_read_metadata(s, 1);

  458.             break;

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

  460.             st = av_new_stream(s, 0);

  461.             if (!st)

  462.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  471.             st->start_time = start_time;

  472.             st->duration = duration;

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

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

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

  476.             st->priv_data = ff_rm_alloc_rmstream();

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

  478.                                           avio_rb32(pb)) < 0)

  479.                 return -1;

  480.             break;

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

  482.             goto header_end;

  483.         default:

  484.             /* unknown tag: skip it */

  485.             avio_skip(pb, tag_size - 10);

  486.             break;

  487.         }

  488.     }

  489.  header_end:

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

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

  492.         rm->nb_packets = 3600 * 25;

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

  494. 

  495.     if (!data_off)

  496.         data_off = avio_tell(pb) - 18;

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

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

  499.         rm_read_index(s);

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

  501.     }

  502. 

  503.     return 0;

  504. }

  505. 

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

  507. {

  508.     int n, n1;

  509. 

  510.     n = avio_rb16(pb);

  511.     (*len)-=2;

  512.     n &= 0x7FFF;

  513.     if (n >= 0x4000) {

  514.         return n - 0x4000;

  515.     } else {

  516.         n1 = avio_rb16(pb);

  517.         (*len)-=2;

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

  519.     }

  520. }

  521. 

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

  523. #define RAW_PACKET_SIZE 1000

  524. 

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

  526.     RMDemuxContext *rm = s->priv_data;

  527.     AVIOContext *pb = s->pb;

  528.     AVStream *st;

  529.     uint32_t state=0xFFFFFFFF;

  530. 

  531.     while(!pb->eof_reached){

  532.         int len, num, i;

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

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

  535.             num= rm->current_stream;

  536.             len= rm->remaining_len;

  537.             *timestamp = AV_NOPTS_VALUE;

  538.             *flags= 0;

  539.         }else{

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

  541. 

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

  543.                 int n_pkts, expected_len;

  544.                 len = avio_rb32(pb);

  545.                 avio_skip(pb, 2);

  546.                 n_pkts = avio_rb32(pb);

  547.                 expected_len = 20 + n_pkts * 14;

  548.                 if (len == 20)

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

  550.                     len = expected_len;

  551.                 else if (len != expected_len)

  552.                     av_log(s, AV_LOG_WARNING,

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

  554.                            len, n_pkts, expected_len);

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

  556.                 if(len<0)

  557.                     continue;

  558.                 goto skip;

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

  560.                 av_log(s, AV_LOG_WARNING,

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

  562.             }

  563. 

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

  565.                 continue;

  566.             len=state - 12;

  567.             state= 0xFFFFFFFF;

  568. 

  569.             num = avio_rb16(pb);

  570.             *timestamp = avio_rb32(pb);

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

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

  573.         }

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

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

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

  577.                 break;

  578.         }

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

  580. skip:

  581.             /* skip packet if unknown number */

  582.             avio_skip(pb, len);

  583.             rm->remaining_len = 0;

  584.             continue;

  585.         }

  586.         *stream_index= i;

  587. 

  588.         return len;

  589.     }

  590.     return -1;

  591. }

  592. 

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

  594.                                    RMDemuxContext *rm, RMStream *vst,

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

  596.                                    int64_t *timestamp)

  597. {

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

  599.     int type;

  600. 

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

  602.     type = hdr >> 6;

  603. 

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

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

  606.     }

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

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

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

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

  611.     }

  612.     if(len<0)

  613.         return -1;

  614.     rm->remaining_len = len;

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

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

  617.             len= len2;

  618.             *timestamp = pos;

  619.         }

  620.         if(rm->remaining_len < len)

  621.             return -1;

  622.         rm->remaining_len -= len;

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

  624.             return AVERROR(EIO);

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

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

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

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

  629.         return 0;

  630.     }

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

  632. 

  633.     *pseq = seq;

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

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

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

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

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

  639.             return AVERROR(ENOMEM);

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

  641.         vst->cur_slice = 0;

  642.         vst->curpic_num = pic_num;

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

  644.     }

  645.     if(type == 2)

  646.         len = FFMIN(len, pos);

  647. 

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

  649.         return 1;

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

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

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

  653.         return 1;

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

  655.         return AVERROR(EIO);

  656.     vst->videobufpos += len;

  657.     rm->remaining_len-= len;

  658. 

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

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

  661.         *pkt= vst->pkt;

  662.         vst->pkt.data= NULL;

  663.         vst->pkt.size= 0;

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

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

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

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

  668.         pkt->pts = AV_NOPTS_VALUE;

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

  670.         vst->slices = 0;

  671.         return 0;

  672.     }

  673. 

  674.     return 1;

  675. }

  676. 

  677. static inline void

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

  679. {

  680.     uint8_t *ptr;

  681.     int j;

  682. 

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

  684.         ptr = pkt->data;

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

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

  687.             ptr += 2;

  688.         }

  689.     }

  690. }

  691. 

  692. /**

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

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

  695.  */

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

  697. {

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

  699. 

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

  701.         int j;

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

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

  704. 

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

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

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

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

  709. 

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

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

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

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

  714.         }

  715.     }

  716. }

  717. 

  718. int

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

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

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

  722. {

  723.     RMDemuxContext *rm = s->priv_data;

  724. 

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

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

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

  728.             return -1; //got partial frame

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

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

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

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

  733.             int x;

  734.             int sps = ast->sub_packet_size;

  735.             int cfs = ast->coded_framesize;

  736.             int h = ast->sub_packet_h;

  737.             int y = ast->sub_packet_cnt;

  738.             int w = ast->audio_framesize;

  739. 

  740.             if (flags & 2)

  741.                 y = ast->sub_packet_cnt = 0;

  742.             if (!y)

  743.                 ast->audiotimestamp = timestamp;

  744. 

  745.             switch (ast->deint_id) {

  746.                 case DEINT_ID_INT4:

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

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

  749.                     break;

  750.                 case DEINT_ID_GENR:

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

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

  753.                     break;

  754.                 case DEINT_ID_SIPR:

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

  756.                     break;

  757.             }

  758. 

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

  760.                 return -1;

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

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

  763. 

  764.              ast->sub_packet_cnt = 0;

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

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

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

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

  769.             int x;

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

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

  772.             if (ast->sub_packet_cnt) {

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

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

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

  776.                 ast->audiotimestamp = timestamp;

  777.             } else

  778.                 return -1;

  779.         } else {

  780.             av_get_packet(pb, pkt, len);

  781.             rm_ac3_swap_bytes(st, pkt);

  782.         }

  783.     } else

  784.         av_get_packet(pb, pkt, len);

  785. 

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

  787. 

  788. #if 0

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

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

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

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

  793. 

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

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

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

  797.         }

  798.     }

  799. #endif

  800. 

  801.     pkt->pts = timestamp;

  802.     if (flags & 2)

  803.         pkt->flags |= AV_PKT_FLAG_KEY;

  804. 

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

  806. }

  807. 

  808. int

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

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

  811. {

  812.     RMDemuxContext *rm = s->priv_data;

  813. 

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

  815. 

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

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

  818.     else {

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

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

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

  822.                st->codec->block_align);

  823.     }

  824.     rm->audio_pkt_cnt--;

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

  826.         ast->audiotimestamp = AV_NOPTS_VALUE;

  827.         pkt->flags = AV_PKT_FLAG_KEY;

  828.     } else

  829.         pkt->flags = 0;

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

  831. 

  832.     return rm->audio_pkt_cnt;

  833. }

  834. 

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

  836. {

  837.     RMDemuxContext *rm = s->priv_data;

  838.     AVStream *st;

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

  840.     int64_t timestamp, pos;

  841.     int flags;

  842. 

  843.     for (;;) {

  844.         if (rm->audio_pkt_cnt) {

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

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

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

  848.             flags = 0;

  849.         } else {

  850.             if (rm->old_format) {

  851.                 RMStream *ast;

  852. 

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

  854.                 ast = st->priv_data;

  855.                 timestamp = AV_NOPTS_VALUE;

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

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

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

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

  860.             } else {

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

  862.                 if (len > 0)

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

  864.             }

  865. 

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

  867.                 return AVERROR(EIO);

  868. 

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

  870.                                       &seq, flags, timestamp);

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

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

  873.             if (res)

  874.                 continue;

  875.         }

  876. 

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

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

  879.             av_free_packet(pkt);

  880.         } else

  881.             break;

  882.     }

  883. 

  884.     return 0;

  885. }

  886. 

  887. static int rm_read_close(AVFormatContext *s)

  888. {

  889.     int i;

  890. 

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

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

  893. 

  894.     return 0;

  895. }

  896. 

  897. static int rm_probe(AVProbeData *p)

  898. {

  899.     /* check file header */

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

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

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

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

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

  905.         return AVPROBE_SCORE_MAX;

  906.     else

  907.         return 0;

  908. }

  909. 

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

  911.                                int64_t *ppos, int64_t pos_limit)

  912. {

  913.     RMDemuxContext *rm = s->priv_data;

  914.     int64_t pos, dts;

  915.     int stream_index2, flags, len, h;

  916. 

  917.     pos = *ppos;

  918. 

  919.     if(rm->old_format)

  920.         return AV_NOPTS_VALUE;

  921. 

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

  923.     rm->remaining_len=0;

  924.     for(;;){

  925.         int seq=1;

  926.         AVStream *st;

  927. 

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

  929.         if(len<0)

  930.             return AV_NOPTS_VALUE;

  931. 

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

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

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

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

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

  937.             }

  938.         }

  939. 

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

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

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

  943.             if(stream_index2 == stream_index)

  944.                 break;

  945.         }

  946. 

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

  948.     }

  949.     *ppos = pos;

  950.     return dts;

  951. }

  952. 

  953. AVInputFormat ff_rm_demuxer = {

  954.     .name           = "rm",

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

  956.     .priv_data_size = sizeof(RMDemuxContext),

  957.     .read_probe     = rm_probe,

  958.     .read_header    = rm_read_header,

  959.     .read_packet    = rm_read_packet,

  960.     .read_close     = rm_read_close,

  961.     .read_timestamp = rm_read_dts,

  962. };

  963. 

  964. AVInputFormat ff_rdt_demuxer = {

  965.     .name           = "rdt",

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

  967.     .priv_data_size = sizeof(RMDemuxContext),

  968.     .read_close     = rm_read_close,

  969. };