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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/channel_layout.h"

  24. #include "libavutil/internal.h"

  25. #include "libavutil/intreadwrite.h"

  26. #include "libavutil/dict.h"

  27. #include "avformat.h"

  28. #include "internal.h"

  29. #include "rmsipr.h"

  30. #include "rm.h"

  31. 

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

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

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

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

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

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

  38. 

  39. struct RMStream {

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

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

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

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

  44.     int cur_slice, slices;

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

  46.     /// Audio descrambling matrix parameters

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

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

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

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

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

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

  53. };

  54. 

  55. typedef struct {

  56.     int nb_packets;

  57.     int old_format;

  58.     int current_stream;

  59.     int remaining_len;

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

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

  62. } RMDemuxContext;

  63. 

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

  65. {

  66.     int i;

  67.     char *q, r;

  68. 

  69.     q = buf;

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

  71.         r = avio_r8(pb);

  72.         if (i < buf_size - 1)

  73.             *q++ = r;

  74.     }

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

  76. }

  77. 

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

  79. {

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

  81. }

  82. 

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

  84. {

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

  86.         return -1;

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

  88.     if (!avctx->extradata)

  89.         return AVERROR(ENOMEM);

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

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

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

  93.         return AVERROR(EIO);

  94.     return 0;

  95. }

  96. 

  97. static void rm_read_metadata(AVFormatContext *s, AVIOContext *pb, int wide)

  98. {

  99.     char buf[1024];

  100.     int i;

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

  102.         int len = wide ? avio_rb16(pb) : avio_r8(pb);

  103.         get_strl(pb, buf, sizeof(buf), len);

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

  105.     }

  106. }

  107. 

  108. RMStream *ff_rm_alloc_rmstream (void)

  109. {

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

  111.     rms->curpic_num = -1;

  112.     return rms;

  113. }

  114. 

  115. void ff_rm_free_rmstream (RMStream *rms)

  116. {

  117.     av_free_packet(&rms->pkt);

  118. }

  119. 

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

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

  122. {

  123.     char buf[256];

  124.     uint32_t version;

  125.     int ret;

  126. 

  127.     /* ra type header */

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

  129.     if (version == 3) {

  130.         int header_size = avio_rb16(pb);

  131.         int64_t startpos = avio_tell(pb);

  132.         avio_skip(pb, 14);

  133.         rm_read_metadata(s, pb, 0);

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

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

  136.             avio_r8(pb);

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

  138.         }

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

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

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

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

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

  144.         st->codec->channel_layout = AV_CH_LAYOUT_MONO;

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

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

  147.         ast->deint_id = DEINT_ID_INT0;

  148.     } else {

  149.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  150.         int codecdata_length;

  151.         /* old version (4) */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  166.         if (version == 5) {

  167.             avio_rb16(pb); avio_rb16(pb); avio_rb16(pb);

  168.         }

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

  170.         avio_rb32(pb);

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

  172.         if (version == 5) {

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

  174.             avio_read(pb, buf, 4);

  175.             buf[4] = 0;

  176.         } else {

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

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

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

  180.         }

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

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

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

  184.                                                 st->codec->codec_tag);

  185. 

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

  187.         case AV_CODEC_ID_AC3:

  188.             st->need_parsing = AVSTREAM_PARSE_FULL;

  189.             break;

  190.         case AV_CODEC_ID_RA_288:

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

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

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

  194.             break;

  195.         case AV_CODEC_ID_COOK:

  196.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  197.         case AV_CODEC_ID_ATRAC3:

  198.         case AV_CODEC_ID_SIPR:

  199.             avio_rb16(pb); avio_r8(pb);

  200.             if (version == 5)

  201.                 avio_r8(pb);

  202.             codecdata_length = avio_rb32(pb);

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

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

  205.                 return -1;

  206.             }

  207. 

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

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

  210.                 if (flavor > 3) {

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

  212.                            flavor);

  213.                     return -1;

  214.                 }

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

  216.             } else {

  217.                 if(sub_packet_size <= 0){

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

  219.                     return -1;

  220.                 }

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

  222.             }

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

  224.                 return ret;

  225.             break;

  226.         case AV_CODEC_ID_AAC:

  227.             avio_rb16(pb); avio_r8(pb);

  228.             if (version == 5)

  229.                 avio_r8(pb);

  230.             codecdata_length = avio_rb32(pb);

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

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

  233.                 return -1;

  234.             }

  235.             if (codecdata_length >= 1) {

  236.                 avio_r8(pb);

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

  238.                     return ret;

  239.             }

  240.             break;

  241.         default:

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

  243.         }

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

  245.             ast->deint_id == DEINT_ID_GENR ||

  246.             ast->deint_id == DEINT_ID_SIPR) {

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

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

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

  250.                 return AVERROR_INVALIDDATA;

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

  252.                 return AVERROR(ENOMEM);

  253.         }

  254.         switch (ast->deint_id) {

  255.         case DEINT_ID_INT4:

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

  257.                 sub_packet_h <= 1 ||

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

  259.                 return AVERROR_INVALIDDATA;

  260.             break;

  261.         case DEINT_ID_GENR:

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

  263.                 ast->sub_packet_size > ast->audio_framesize)

  264.                 return AVERROR_INVALIDDATA;

  265.             break;

  266.         case DEINT_ID_SIPR:

  267.         case DEINT_ID_INT0:

  268.         case DEINT_ID_VBRS:

  269.         case DEINT_ID_VBRF:

  270.             break;

  271.         default:

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

  273.             return AVERROR_INVALIDDATA;

  274.         }

  275. 

  276.         if (read_all) {

  277.             avio_r8(pb);

  278.             avio_r8(pb);

  279.             avio_r8(pb);

  280.             rm_read_metadata(s, pb, 0);

  281.         }

  282.     }

  283.     return 0;

  284. }

  285. 

  286. int

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

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

  289. {

  290.     unsigned int v;

  291.     int size;

  292.     int64_t codec_pos;

  293.     int ret;

  294. 

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

  296.     codec_pos = avio_tell(pb);

  297.     v = avio_rb32(pb);

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

  299.         /* ra type header */

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

  301.             return -1;

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

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

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

  305.             return ret;

  306. 

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

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

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

  310.                                                 st->codec->codec_tag);

  311.     } else {

  312.         int fps;

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

  314.         fail1:

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

  316.             goto skip;

  317.         }

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

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

  320.                                                st->codec->codec_tag);

  321.         av_dlog(s, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));

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

  323.             goto fail1;

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

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

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

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

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

  329.         st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  330.         fps = avio_rb32(pb);

  331. 

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

  333.             return ret;

  334. 

  335.         if (fps > 0) {

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

  337.                       0x10000, fps, (1 << 30) - 1);

  338.         } else if (s->error_recognition & AV_EF_EXPLODE) {

  339.             av_log(s, AV_LOG_ERROR, "Invalid framerate\n");

  340.             return AVERROR_INVALIDDATA;

  341.         }

  342.     }

  343. 

  344. skip:

  345.     /* skip codec info */

  346.     size = avio_tell(pb) - codec_pos;

  347.     avio_skip(pb, codec_data_size - size);

  348. 

  349.     return 0;

  350. }

  351. 

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

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

  354. static int rm_read_index(AVFormatContext *s)

  355. {

  356.     AVIOContext *pb = s->pb;

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

  358.     AVStream *st;

  359. 

  360.     do {

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

  362.             return -1;

  363.         size     = avio_rb32(pb);

  364.         if (size < 20)

  365.             return -1;

  366.         avio_skip(pb, 2);

  367.         n_pkts   = avio_rb32(pb);

  368.         str_id   = avio_rb16(pb);

  369.         next_off = avio_rb32(pb);

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

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

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

  373.                 break;

  374.             }

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

  376.             av_log(s, AV_LOG_ERROR,

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

  378.                    str_id, avio_tell(pb));

  379.             goto skip;

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

  381.             av_log(s, AV_LOG_ERROR,

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

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

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

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

  386.             goto skip;

  387.         }

  388. 

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

  390.             avio_skip(pb, 2);

  391.             pts = avio_rb32(pb);

  392.             pos = avio_rb32(pb);

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

  394. 

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

  396.         }

  397. 

  398. skip:

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

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

  401.             av_log(s, AV_LOG_ERROR,

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

  403.             return -1;

  404.         }

  405.     } while (next_off);

  406. 

  407.     return 0;

  408. }

  409. 

  410. static int rm_read_header_old(AVFormatContext *s)

  411. {

  412.     RMDemuxContext *rm = s->priv_data;

  413.     AVStream *st;

  414. 

  415.     rm->old_format = 1;

  416.     st = avformat_new_stream(s, NULL);

  417.     if (!st)

  418.         return -1;

  419.     st->priv_data = ff_rm_alloc_rmstream();

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

  421. }

  422. 

  423. static int rm_read_header(AVFormatContext *s)

  424. {

  425.     RMDemuxContext *rm = s->priv_data;

  426.     AVStream *st;

  427.     AVIOContext *pb = s->pb;

  428.     unsigned int tag;

  429.     int tag_size;

  430.     unsigned int start_time, duration;

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

  432.     char buf[128];

  433.     int flags = 0;

  434. 

  435.     tag = avio_rl32(pb);

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

  437.         /* very old .ra format */

  438.         return rm_read_header_old(s);

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

  440.         return AVERROR(EIO);

  441.     }

  442. 

  443.     tag_size = avio_rb32(pb);

  444.     avio_skip(pb, tag_size - 8);

  445. 

  446.     for(;;) {

  447.         if (pb->eof_reached)

  448.             return -1;

  449.         tag = avio_rl32(pb);

  450.         tag_size = avio_rb32(pb);

  451.         avio_rb16(pb);

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

  453.                 (tag      ) & 0xff,

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

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

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

  457.                 tag,

  458.                 tag_size);

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

  460.             return -1;

  461.         switch(tag) {

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

  463.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

  475.             break;

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

  477.             rm_read_metadata(s, pb, 1);

  478.             break;

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

  480.             st = avformat_new_stream(s, NULL);

  481.             if (!st)

  482.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  491.             st->start_time = start_time;

  492.             st->duration = duration;

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

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

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

  496.             st->priv_data = ff_rm_alloc_rmstream();

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

  498.                                           avio_rb32(pb)) < 0)

  499.                 return -1;

  500.             break;

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

  502.             goto header_end;

  503.         default:

  504.             /* unknown tag: skip it */

  505.             avio_skip(pb, tag_size - 10);

  506.             break;

  507.         }

  508.     }

  509.  header_end:

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

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

  512.         rm->nb_packets = 3600 * 25;

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

  514. 

  515.     if (!data_off)

  516.         data_off = avio_tell(pb) - 18;

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

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

  519.         rm_read_index(s);

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

  521.     }

  522. 

  523.     return 0;

  524. }

  525. 

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

  527. {

  528.     int n, n1;

  529. 

  530.     n = avio_rb16(pb);

  531.     (*len)-=2;

  532.     n &= 0x7FFF;

  533.     if (n >= 0x4000) {

  534.         return n - 0x4000;

  535.     } else {

  536.         n1 = avio_rb16(pb);

  537.         (*len)-=2;

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

  539.     }

  540. }

  541. 

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

  543. #define RAW_PACKET_SIZE 1000

  544. 

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

  546.     RMDemuxContext *rm = s->priv_data;

  547.     AVIOContext *pb = s->pb;

  548.     AVStream *st;

  549.     uint32_t state=0xFFFFFFFF;

  550. 

  551.     while(!pb->eof_reached){

  552.         int len, num, i;

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

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

  555.             num= rm->current_stream;

  556.             len= rm->remaining_len;

  557.             *timestamp = AV_NOPTS_VALUE;

  558.             *flags= 0;

  559.         }else{

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

  561. 

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

  563.                 int n_pkts, expected_len;

  564.                 len = avio_rb32(pb);

  565.                 avio_skip(pb, 2);

  566.                 n_pkts = avio_rb32(pb);

  567.                 expected_len = 20 + n_pkts * 14;

  568.                 if (len == 20)

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

  570.                     len = expected_len;

  571.                 else if (len != expected_len)

  572.                     av_log(s, AV_LOG_WARNING,

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

  574.                            len, n_pkts, expected_len);

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

  576.                 if(len<0)

  577.                     continue;

  578.                 goto skip;

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

  580.                 av_log(s, AV_LOG_WARNING,

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

  582.             }

  583. 

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

  585.                 continue;

  586.             len=state - 12;

  587.             state= 0xFFFFFFFF;

  588. 

  589.             num = avio_rb16(pb);

  590.             *timestamp = avio_rb32(pb);

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

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

  593.         }

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

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

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

  597.                 break;

  598.         }

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

  600. skip:

  601.             /* skip packet if unknown number */

  602.             avio_skip(pb, len);

  603.             rm->remaining_len = 0;

  604.             continue;

  605.         }

  606.         *stream_index= i;

  607. 

  608.         return len;

  609.     }

  610.     return -1;

  611. }

  612. 

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

  614.                                    RMDemuxContext *rm, RMStream *vst,

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

  616.                                    int64_t *timestamp)

  617. {

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

  619.     int type;

  620. 

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

  622.     type = hdr >> 6;

  623. 

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

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

  626.     }

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

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

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

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

  631.     }

  632.     if(len<0)

  633.         return -1;

  634.     rm->remaining_len = len;

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

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

  637.             len= len2;

  638.             *timestamp = pos;

  639.         }

  640.         if(rm->remaining_len < len)

  641.             return -1;

  642.         rm->remaining_len -= len;

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

  644.             return AVERROR(EIO);

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

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

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

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

  649.         return 0;

  650.     }

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

  652. 

  653.     *pseq = seq;

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

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

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

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

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

  659.             return AVERROR(ENOMEM);

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

  661.         vst->cur_slice = 0;

  662.         vst->curpic_num = pic_num;

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

  664.     }

  665.     if(type == 2)

  666.         len = FFMIN(len, pos);

  667. 

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

  669.         return 1;

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

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

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

  673.         return 1;

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

  675.         return AVERROR(EIO);

  676.     vst->videobufpos += len;

  677.     rm->remaining_len-= len;

  678. 

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

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

  681.         *pkt= vst->pkt;

  682.         vst->pkt.data= NULL;

  683.         vst->pkt.size= 0;

  684.         vst->pkt.buf = NULL;

  685. #if FF_API_DESTRUCT_PACKET

  686. FF_DISABLE_DEPRECATION_WARNINGS

  687.         vst->pkt.destruct = NULL;

  688. FF_ENABLE_DEPRECATION_WARNINGS

  689. #endif

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

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

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

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

  694.         pkt->pts = AV_NOPTS_VALUE;

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

  696.         vst->slices = 0;

  697.         return 0;

  698.     }

  699. 

  700.     return 1;

  701. }

  702. 

  703. static inline void

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

  705. {

  706.     uint8_t *ptr;

  707.     int j;

  708. 

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

  710.         ptr = pkt->data;

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

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

  713.             ptr += 2;

  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 == AV_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 (ast->deint_id == DEINT_ID_VBRF ||

  817.         ast->deint_id == DEINT_ID_VBRS)

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

  819.     else {

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

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

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

  823.                st->codec->block_align);

  824.     }

  825.     rm->audio_pkt_cnt--;

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

  827.         ast->audiotimestamp = AV_NOPTS_VALUE;

  828.         pkt->flags = AV_PKT_FLAG_KEY;

  829.     } else

  830.         pkt->flags = 0;

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

  832. 

  833.     return rm->audio_pkt_cnt;

  834. }

  835. 

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

  837. {

  838.     RMDemuxContext *rm = s->priv_data;

  839.     AVStream *st;

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

  841.     int64_t timestamp, pos;

  842.     int flags;

  843. 

  844.     for (;;) {

  845.         if (rm->audio_pkt_cnt) {

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

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

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

  849.             flags = 0;

  850.         } else {

  851.             if (rm->old_format) {

  852.                 RMStream *ast;

  853. 

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

  855.                 ast = st->priv_data;

  856.                 timestamp = AV_NOPTS_VALUE;

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

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

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

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

  861.             } else {

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

  863.                 if (len > 0)

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

  865.             }

  866. 

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

  868.                 return AVERROR(EIO);

  869. 

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

  871.                                       &seq, flags, timestamp);

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

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

  874.             if (res)

  875.                 continue;

  876.         }

  877. 

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

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

  880.             av_free_packet(pkt);

  881.         } else

  882.             break;

  883.     }

  884. 

  885.     return 0;

  886. }

  887. 

  888. static int rm_read_close(AVFormatContext *s)

  889. {

  890.     int i;

  891. 

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

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

  894. 

  895.     return 0;

  896. }

  897. 

  898. static int rm_probe(AVProbeData *p)

  899. {

  900.     /* check file header */

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

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

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

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

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

  906.         return AVPROBE_SCORE_MAX;

  907.     else

  908.         return 0;

  909. }

  910. 

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

  912.                                int64_t *ppos, int64_t pos_limit)

  913. {

  914.     RMDemuxContext *rm = s->priv_data;

  915.     int64_t pos, dts;

  916.     int stream_index2, flags, len, h;

  917. 

  918.     pos = *ppos;

  919. 

  920.     if(rm->old_format)

  921.         return AV_NOPTS_VALUE;

  922. 

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

  924.     rm->remaining_len=0;

  925.     for(;;){

  926.         int seq=1;

  927.         AVStream *st;

  928. 

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

  930.         if(len<0)

  931.             return AV_NOPTS_VALUE;

  932. 

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

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

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

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

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

  938.             }

  939.         }

  940. 

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

  942.             av_dlog(s, "%d %d-%d %"PRId64" %d\n",

  943.                     flags, stream_index2, stream_index, dts, seq);

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

  945.             if(stream_index2 == stream_index)

  946.                 break;

  947.         }

  948. 

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

  950.     }

  951.     *ppos = pos;

  952.     return dts;

  953. }

  954. 

  955. AVInputFormat ff_rm_demuxer = {

  956.     .name           = "rm",

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

  958.     .priv_data_size = sizeof(RMDemuxContext),

  959.     .read_probe     = rm_probe,

  960.     .read_header    = rm_read_header,

  961.     .read_packet    = rm_read_packet,

  962.     .read_close     = rm_read_close,

  963.     .read_timestamp = rm_read_dts,

  964. };

  965. 

  966. AVInputFormat ff_rdt_demuxer = {

  967.     .name           = "rdt",

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

  969.     .priv_data_size = sizeof(RMDemuxContext),

  970.     .read_close     = rm_read_close,

  971.     .flags          = AVFMT_NOFILE,

  972. };