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

  336.                   0x10000, fps, (1 << 30) - 1);

  337.     }

  338. 

  339. skip:

  340.     /* skip codec info */

  341.     size = avio_tell(pb) - codec_pos;

  342.     avio_skip(pb, codec_data_size - size);

  343. 

  344.     return 0;

  345. }

  346. 

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

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

  349. static int rm_read_index(AVFormatContext *s)

  350. {

  351.     AVIOContext *pb = s->pb;

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

  353.     AVStream *st;

  354. 

  355.     do {

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

  357.             return -1;

  358.         size     = avio_rb32(pb);

  359.         if (size < 20)

  360.             return -1;

  361.         avio_skip(pb, 2);

  362.         n_pkts   = avio_rb32(pb);

  363.         str_id   = avio_rb16(pb);

  364.         next_off = avio_rb32(pb);

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

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

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

  368.                 break;

  369.             }

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

  371.             av_log(s, AV_LOG_ERROR,

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

  373.                    str_id, avio_tell(pb));

  374.             goto skip;

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

  376.             av_log(s, AV_LOG_ERROR,

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

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

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

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

  381.             goto skip;

  382.         }

  383. 

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

  385.             avio_skip(pb, 2);

  386.             pts = avio_rb32(pb);

  387.             pos = avio_rb32(pb);

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

  389. 

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

  391.         }

  392. 

  393. skip:

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

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

  396.             av_log(s, AV_LOG_ERROR,

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

  398.             return -1;

  399.         }

  400.     } while (next_off);

  401. 

  402.     return 0;

  403. }

  404. 

  405. static int rm_read_header_old(AVFormatContext *s)

  406. {

  407.     RMDemuxContext *rm = s->priv_data;

  408.     AVStream *st;

  409. 

  410.     rm->old_format = 1;

  411.     st = avformat_new_stream(s, NULL);

  412.     if (!st)

  413.         return -1;

  414.     st->priv_data = ff_rm_alloc_rmstream();

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

  416. }

  417. 

  418. static int rm_read_header(AVFormatContext *s)

  419. {

  420.     RMDemuxContext *rm = s->priv_data;

  421.     AVStream *st;

  422.     AVIOContext *pb = s->pb;

  423.     unsigned int tag;

  424.     int tag_size;

  425.     unsigned int start_time, duration;

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

  427.     char buf[128];

  428.     int flags = 0;

  429. 

  430.     tag = avio_rl32(pb);

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

  432.         /* very old .ra format */

  433.         return rm_read_header_old(s);

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

  435.         return AVERROR(EIO);

  436.     }

  437. 

  438.     tag_size = avio_rb32(pb);

  439.     avio_skip(pb, tag_size - 8);

  440. 

  441.     for(;;) {

  442.         if (pb->eof_reached)

  443.             return -1;

  444.         tag = avio_rl32(pb);

  445.         tag_size = avio_rb32(pb);

  446.         avio_rb16(pb);

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

  448.                 (tag      ) & 0xff,

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

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

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

  452.                 tag,

  453.                 tag_size);

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

  455.             return -1;

  456.         switch(tag) {

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

  458.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

  470.             break;

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

  472.             rm_read_metadata(s, pb, 1);

  473.             break;

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

  475.             st = avformat_new_stream(s, NULL);

  476.             if (!st)

  477.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  486.             st->start_time = start_time;

  487.             st->duration = duration;

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

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

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

  491.             st->priv_data = ff_rm_alloc_rmstream();

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

  493.                                           avio_rb32(pb)) < 0)

  494.                 return -1;

  495.             break;

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

  497.             goto header_end;

  498.         default:

  499.             /* unknown tag: skip it */

  500.             avio_skip(pb, tag_size - 10);

  501.             break;

  502.         }

  503.     }

  504.  header_end:

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

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

  507.         rm->nb_packets = 3600 * 25;

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

  509. 

  510.     if (!data_off)

  511.         data_off = avio_tell(pb) - 18;

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

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

  514.         rm_read_index(s);

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

  516.     }

  517. 

  518.     return 0;

  519. }

  520. 

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

  522. {

  523.     int n, n1;

  524. 

  525.     n = avio_rb16(pb);

  526.     (*len)-=2;

  527.     n &= 0x7FFF;

  528.     if (n >= 0x4000) {

  529.         return n - 0x4000;

  530.     } else {

  531.         n1 = avio_rb16(pb);

  532.         (*len)-=2;

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

  534.     }

  535. }

  536. 

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

  538. #define RAW_PACKET_SIZE 1000

  539. 

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

  541.     RMDemuxContext *rm = s->priv_data;

  542.     AVIOContext *pb = s->pb;

  543.     AVStream *st;

  544.     uint32_t state=0xFFFFFFFF;

  545. 

  546.     while(!pb->eof_reached){

  547.         int len, num, i;

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

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

  550.             num= rm->current_stream;

  551.             len= rm->remaining_len;

  552.             *timestamp = AV_NOPTS_VALUE;

  553.             *flags= 0;

  554.         }else{

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

  556. 

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

  558.                 int n_pkts, expected_len;

  559.                 len = avio_rb32(pb);

  560.                 avio_skip(pb, 2);

  561.                 n_pkts = avio_rb32(pb);

  562.                 expected_len = 20 + n_pkts * 14;

  563.                 if (len == 20)

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

  565.                     len = expected_len;

  566.                 else if (len != expected_len)

  567.                     av_log(s, AV_LOG_WARNING,

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

  569.                            len, n_pkts, expected_len);

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

  571.                 if(len<0)

  572.                     continue;

  573.                 goto skip;

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

  575.                 av_log(s, AV_LOG_WARNING,

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

  577.             }

  578. 

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

  580.                 continue;

  581.             len=state - 12;

  582.             state= 0xFFFFFFFF;

  583. 

  584.             num = avio_rb16(pb);

  585.             *timestamp = avio_rb32(pb);

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

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

  588.         }

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

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

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

  592.                 break;

  593.         }

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

  595. skip:

  596.             /* skip packet if unknown number */

  597.             avio_skip(pb, len);

  598.             rm->remaining_len = 0;

  599.             continue;

  600.         }

  601.         *stream_index= i;

  602. 

  603.         return len;

  604.     }

  605.     return -1;

  606. }

  607. 

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

  609.                                    RMDemuxContext *rm, RMStream *vst,

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

  611.                                    int64_t *timestamp)

  612. {

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

  614.     int type;

  615. 

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

  617.     type = hdr >> 6;

  618. 

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

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

  621.     }

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

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

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

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

  626.     }

  627.     if(len<0)

  628.         return -1;

  629.     rm->remaining_len = len;

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

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

  632.             len= len2;

  633.             *timestamp = pos;

  634.         }

  635.         if(rm->remaining_len < len)

  636.             return -1;

  637.         rm->remaining_len -= len;

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

  639.             return AVERROR(EIO);

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

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

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

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

  644.         return 0;

  645.     }

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

  647. 

  648.     *pseq = seq;

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

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

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

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

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

  654.             return AVERROR(ENOMEM);

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

  656.         vst->cur_slice = 0;

  657.         vst->curpic_num = pic_num;

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

  659.     }

  660.     if(type == 2)

  661.         len = FFMIN(len, pos);

  662. 

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

  664.         return 1;

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

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

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

  668.         return 1;

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

  670.         return AVERROR(EIO);

  671.     vst->videobufpos += len;

  672.     rm->remaining_len-= len;

  673. 

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

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

  676.         *pkt= vst->pkt;

  677.         vst->pkt.data= NULL;

  678.         vst->pkt.size= 0;

  679.         vst->pkt.buf = NULL;

  680. #if FF_API_DESTRUCT_PACKET

  681. FF_DISABLE_DEPRECATION_WARNINGS

  682.         vst->pkt.destruct = NULL;

  683. FF_ENABLE_DEPRECATION_WARNINGS

  684. #endif

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

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

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

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

  689.         pkt->pts = AV_NOPTS_VALUE;

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

  691.         vst->slices = 0;

  692.         return 0;

  693.     }

  694. 

  695.     return 1;

  696. }

  697. 

  698. static inline void

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

  700. {

  701.     uint8_t *ptr;

  702.     int j;

  703. 

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

  705.         ptr = pkt->data;

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

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

  708.             ptr += 2;

  709.         }

  710.     }

  711. }

  712. 

  713. int

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

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

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

  717. {

  718.     RMDemuxContext *rm = s->priv_data;

  719. 

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

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

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

  723.             return -1; //got partial frame

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

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

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

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

  728.             int x;

  729.             int sps = ast->sub_packet_size;

  730.             int cfs = ast->coded_framesize;

  731.             int h = ast->sub_packet_h;

  732.             int y = ast->sub_packet_cnt;

  733.             int w = ast->audio_framesize;

  734. 

  735.             if (flags & 2)

  736.                 y = ast->sub_packet_cnt = 0;

  737.             if (!y)

  738.                 ast->audiotimestamp = timestamp;

  739. 

  740.             switch (ast->deint_id) {

  741.                 case DEINT_ID_INT4:

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

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

  744.                     break;

  745.                 case DEINT_ID_GENR:

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

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

  748.                     break;

  749.                 case DEINT_ID_SIPR:

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

  751.                     break;

  752.             }

  753. 

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

  755.                 return -1;

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

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

  758. 

  759.              ast->sub_packet_cnt = 0;

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

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

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

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

  764.             int x;

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

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

  767.             if (ast->sub_packet_cnt) {

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

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

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

  771.                 ast->audiotimestamp = timestamp;

  772.             } else

  773.                 return -1;

  774.         } else {

  775.             av_get_packet(pb, pkt, len);

  776.             rm_ac3_swap_bytes(st, pkt);

  777.         }

  778.     } else

  779.         av_get_packet(pb, pkt, len);

  780. 

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

  782. 

  783. #if 0

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

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

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

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

  788. 

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

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

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

  792.         }

  793.     }

  794. #endif

  795. 

  796.     pkt->pts = timestamp;

  797.     if (flags & 2)

  798.         pkt->flags |= AV_PKT_FLAG_KEY;

  799. 

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

  801. }

  802. 

  803. int

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

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

  806. {

  807.     RMDemuxContext *rm = s->priv_data;

  808. 

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

  810. 

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

  812.         ast->deint_id == DEINT_ID_VBRS)

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

  814.     else {

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

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

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

  818.                st->codec->block_align);

  819.     }

  820.     rm->audio_pkt_cnt--;

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

  822.         ast->audiotimestamp = AV_NOPTS_VALUE;

  823.         pkt->flags = AV_PKT_FLAG_KEY;

  824.     } else

  825.         pkt->flags = 0;

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

  827. 

  828.     return rm->audio_pkt_cnt;

  829. }

  830. 

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

  832. {

  833.     RMDemuxContext *rm = s->priv_data;

  834.     AVStream *st;

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

  836.     int64_t timestamp, pos;

  837.     int flags;

  838. 

  839.     for (;;) {

  840.         if (rm->audio_pkt_cnt) {

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

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

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

  844.             flags = 0;

  845.         } else {

  846.             if (rm->old_format) {

  847.                 RMStream *ast;

  848. 

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

  850.                 ast = st->priv_data;

  851.                 timestamp = AV_NOPTS_VALUE;

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

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

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

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

  856.             } else {

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

  858.                 if (len > 0)

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

  860.             }

  861. 

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

  863.                 return AVERROR(EIO);

  864. 

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

  866.                                       &seq, flags, timestamp);

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

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

  869.             if (res)

  870.                 continue;

  871.         }

  872. 

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

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

  875.             av_free_packet(pkt);

  876.         } else

  877.             break;

  878.     }

  879. 

  880.     return 0;

  881. }

  882. 

  883. static int rm_read_close(AVFormatContext *s)

  884. {

  885.     int i;

  886. 

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

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

  889. 

  890.     return 0;

  891. }

  892. 

  893. static int rm_probe(AVProbeData *p)

  894. {

  895.     /* check file header */

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

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

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

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

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

  901.         return AVPROBE_SCORE_MAX;

  902.     else

  903.         return 0;

  904. }

  905. 

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

  907.                                int64_t *ppos, int64_t pos_limit)

  908. {

  909.     RMDemuxContext *rm = s->priv_data;

  910.     int64_t pos, dts;

  911.     int stream_index2, flags, len, h;

  912. 

  913.     pos = *ppos;

  914. 

  915.     if(rm->old_format)

  916.         return AV_NOPTS_VALUE;

  917. 

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

  919.     rm->remaining_len=0;

  920.     for(;;){

  921.         int seq=1;

  922.         AVStream *st;

  923. 

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

  925.         if(len<0)

  926.             return AV_NOPTS_VALUE;

  927. 

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

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

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

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

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

  933.             }

  934.         }

  935. 

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

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

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

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

  940.             if(stream_index2 == stream_index)

  941.                 break;

  942.         }

  943. 

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

  945.     }

  946.     *ppos = pos;

  947.     return dts;

  948. }

  949. 

  950. AVInputFormat ff_rm_demuxer = {

  951.     .name           = "rm",

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

  953.     .priv_data_size = sizeof(RMDemuxContext),

  954.     .read_probe     = rm_probe,

  955.     .read_header    = rm_read_header,

  956.     .read_packet    = rm_read_packet,

  957.     .read_close     = rm_read_close,

  958.     .read_timestamp = rm_read_dts,

  959. };

  960. 

  961. AVInputFormat ff_rdt_demuxer = {

  962.     .name           = "rdt",

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

  964.     .priv_data_size = sizeof(RMDemuxContext),

  965.     .read_close     = rm_read_close,

  966.     .flags          = AVFMT_NOFILE,

  967. };