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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 <inttypes.h>

  23. 

  24. #include "libavutil/avstring.h"

  25. #include "libavutil/channel_layout.h"

  26. #include "libavutil/internal.h"

  27. #include "libavutil/intreadwrite.h"

  28. #include "libavutil/dict.h"

  29. #include "avformat.h"

  30. #include "internal.h"

  31. #include "rmsipr.h"

  32. #include "rm.h"

  33. 

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

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

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

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

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

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

  40. 

  41. struct RMStream {

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

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

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

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

  46.     int cur_slice, slices;

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

  48.     /// Audio descrambling matrix parameters

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

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

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

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

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

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

  55. };

  56. 

  57. typedef struct RMDemuxContext {

  58.     int nb_packets;

  59.     int old_format;

  60.     int current_stream;

  61.     int remaining_len;

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

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

  64. } RMDemuxContext;

  65. 

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

  67. {

  68.     int i;

  69.     char *q, r;

  70. 

  71.     q = buf;

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

  73.         r = avio_r8(pb);

  74.         if (i < buf_size - 1)

  75.             *q++ = r;

  76.     }

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

  78. }

  79. 

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

  81. {

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

  83. }

  84. 

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

  86. {

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

  88.         return -1;

  89.     avctx->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);

  90.     if (!avctx->extradata)

  91.         return AVERROR(ENOMEM);

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

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

  94.         return AVERROR(EIO);

  95.     return 0;

  96. }

  97. 

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

  99. {

  100.     char buf[1024];

  101.     int i;

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

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

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

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

  106.     }

  107. }

  108. 

  109. RMStream *ff_rm_alloc_rmstream (void)

  110. {

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

  112.     if (!rms)

  113.         return NULL;

  114.     rms->curpic_num = -1;

  115.     return rms;

  116. }

  117. 

  118. void ff_rm_free_rmstream (RMStream *rms)

  119. {

  120.     av_free_packet(&rms->pkt);

  121. }

  122. 

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

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

  125. {

  126.     char buf[256];

  127.     uint32_t version;

  128.     int ret;

  129. 

  130.     /* ra type header */

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

  132.     if (version == 3) {

  133.         int header_size = avio_rb16(pb);

  134.         int64_t startpos = avio_tell(pb);

  135.         avio_skip(pb, 14);

  136.         rm_read_metadata(s, pb, 0);

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

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

  139.             avio_r8(pb);

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

  141.         }

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

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

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

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

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

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

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

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

  150.         ast->deint_id = DEINT_ID_INT0;

  151.     } else {

  152.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  153.         int codecdata_length;

  154.         /* old version (4) */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  169.         if (version == 5) {

  170.             avio_rb16(pb); avio_rb16(pb); avio_rb16(pb);

  171.         }

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

  173.         avio_rb32(pb);

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

  175.         if (version == 5) {

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

  177.             avio_read(pb, buf, 4);

  178.             buf[4] = 0;

  179.         } else {

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

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

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

  183.         }

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

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

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

  187.                                                 st->codec->codec_tag);

  188. 

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

  190.         case AV_CODEC_ID_AC3:

  191.             st->need_parsing = AVSTREAM_PARSE_FULL;

  192.             break;

  193.         case AV_CODEC_ID_RA_288:

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

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

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

  197.             break;

  198.         case AV_CODEC_ID_COOK:

  199.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  200.         case AV_CODEC_ID_ATRAC3:

  201.         case AV_CODEC_ID_SIPR:

  202.             avio_rb16(pb); avio_r8(pb);

  203.             if (version == 5)

  204.                 avio_r8(pb);

  205.             codecdata_length = avio_rb32(pb);

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

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

  208.                 return -1;

  209.             }

  210. 

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

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

  213.                 if (flavor > 3) {

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

  215.                            flavor);

  216.                     return -1;

  217.                 }

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

  219.             } else {

  220.                 if(sub_packet_size <= 0){

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

  222.                     return -1;

  223.                 }

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

  225.             }

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

  227.                 return ret;

  228.             break;

  229.         case AV_CODEC_ID_AAC:

  230.             avio_rb16(pb); avio_r8(pb);

  231.             if (version == 5)

  232.                 avio_r8(pb);

  233.             codecdata_length = avio_rb32(pb);

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

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

  236.                 return -1;

  237.             }

  238.             if (codecdata_length >= 1) {

  239.                 avio_r8(pb);

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

  241.                     return ret;

  242.             }

  243.             break;

  244.         }

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

  246.             ast->deint_id == DEINT_ID_GENR ||

  247.             ast->deint_id == DEINT_ID_SIPR) {

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

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

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

  251.                 return AVERROR_INVALIDDATA;

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

  253.                 return AVERROR(ENOMEM);

  254.         }

  255.         switch (ast->deint_id) {

  256.         case DEINT_ID_INT4:

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

  258.                 sub_packet_h <= 1 ||

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

  260.                 return AVERROR_INVALIDDATA;

  261.             break;

  262.         case DEINT_ID_GENR:

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

  264.                 ast->sub_packet_size > ast->audio_framesize)

  265.                 return AVERROR_INVALIDDATA;

  266.             break;

  267.         case DEINT_ID_SIPR:

  268.         case DEINT_ID_INT0:

  269.         case DEINT_ID_VBRS:

  270.         case DEINT_ID_VBRF:

  271.             break;

  272.         default:

  273.             av_log(NULL, 0 ,"Unknown interleaver %"PRIX32"\n", ast->deint_id);

  274.             return AVERROR_INVALIDDATA;

  275.         }

  276. 

  277.         if (read_all) {

  278.             avio_r8(pb);

  279.             avio_r8(pb);

  280.             avio_r8(pb);

  281.             rm_read_metadata(s, pb, 0);

  282.         }

  283.     }

  284.     return 0;

  285. }

  286. 

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

  288.                               AVStream *st, RMStream *rst,

  289.                               unsigned int codec_data_size)

  290. {

  291.     unsigned int v;

  292.     int size;

  293.     int64_t codec_pos;

  294.     int ret;

  295. 

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

  297.     codec_pos = avio_tell(pb);

  298.     v = avio_rb32(pb);

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

  300.         /* ra type header */

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

  302.             return -1;

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

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

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

  306.             return ret;

  307. 

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

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

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

  311.                                                 st->codec->codec_tag);

  312.     } else {

  313.         int fps;

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

  315.         fail1:

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

  317.             goto skip;

  318.         }

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

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

  321.                                                st->codec->codec_tag);

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

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

  324.             goto fail1;

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

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

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

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

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

  330.         st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  331.         fps = avio_rb32(pb);

  332. 

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

  334.             return ret;

  335. 

  336.         if (fps > 0) {

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

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

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

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

  341.             return AVERROR_INVALIDDATA;

  342.         }

  343.     }

  344. 

  345. skip:

  346.     /* skip codec info */

  347.     size = avio_tell(pb) - codec_pos;

  348.     avio_skip(pb, codec_data_size - size);

  349. 

  350.     return 0;

  351. }

  352. 

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

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

  355. static int rm_read_index(AVFormatContext *s)

  356. {

  357.     AVIOContext *pb = s->pb;

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

  359.     AVStream *st;

  360. 

  361.     do {

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

  363.             return -1;

  364.         size     = avio_rb32(pb);

  365.         if (size < 20)

  366.             return -1;

  367.         avio_skip(pb, 2);

  368.         n_pkts   = avio_rb32(pb);

  369.         str_id   = avio_rb16(pb);

  370.         next_off = avio_rb32(pb);

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

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

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

  374.                 break;

  375.             }

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

  377.             av_log(s, AV_LOG_ERROR,

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

  379.                    str_id, avio_tell(pb));

  380.             goto skip;

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

  382.             av_log(s, AV_LOG_ERROR,

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

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

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

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

  387.             goto skip;

  388.         }

  389. 

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

  391.             avio_skip(pb, 2);

  392.             pts = avio_rb32(pb);

  393.             pos = avio_rb32(pb);

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

  395. 

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

  397.         }

  398. 

  399. skip:

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

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

  402.             av_log(s, AV_LOG_ERROR,

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

  404.             return -1;

  405.         }

  406.     } while (next_off);

  407. 

  408.     return 0;

  409. }

  410. 

  411. static int rm_read_header_old(AVFormatContext *s)

  412. {

  413.     RMDemuxContext *rm = s->priv_data;

  414.     AVStream *st;

  415. 

  416.     rm->old_format = 1;

  417.     st = avformat_new_stream(s, NULL);

  418.     if (!st)

  419.         return -1;

  420.     st->priv_data = ff_rm_alloc_rmstream();

  421.     if (!st->priv_data)

  422.         return AVERROR(ENOMEM);

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

  424. }

  425. 

  426. static int rm_read_header(AVFormatContext *s)

  427. {

  428.     RMDemuxContext *rm = s->priv_data;

  429.     AVStream *st;

  430.     AVIOContext *pb = s->pb;

  431.     unsigned int tag;

  432.     int tag_size;

  433.     unsigned int start_time, duration;

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

  435.     char buf[128];

  436.     int flags = 0;

  437. 

  438.     tag = avio_rl32(pb);

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

  440.         /* very old .ra format */

  441.         return rm_read_header_old(s);

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

  443.         return AVERROR(EIO);

  444.     }

  445. 

  446.     tag_size = avio_rb32(pb);

  447.     avio_skip(pb, tag_size - 8);

  448. 

  449.     for(;;) {

  450.         if (pb->eof_reached)

  451.             return -1;

  452.         tag = avio_rl32(pb);

  453.         tag_size = avio_rb32(pb);

  454.         avio_rb16(pb);

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

  456.                 (tag      ) & 0xff,

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

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

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

  460.                 tag,

  461.                 tag_size);

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

  463.             return -1;

  464.         switch(tag) {

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

  466.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

  478.             break;

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

  480.             rm_read_metadata(s, pb, 1);

  481.             break;

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

  483.             st = avformat_new_stream(s, NULL);

  484.             if (!st)

  485.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  494.             st->start_time = start_time;

  495.             st->duration = duration;

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

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

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

  499.             st->priv_data = ff_rm_alloc_rmstream();

  500.             if (!st->priv_data)

  501.                 return AVERROR(ENOMEM);

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

  503.                                           avio_rb32(pb)) < 0)

  504.                 return -1;

  505.             break;

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

  507.             goto header_end;

  508.         default:

  509.             /* unknown tag: skip it */

  510.             avio_skip(pb, tag_size - 10);

  511.             break;

  512.         }

  513.     }

  514.  header_end:

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

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

  517.         rm->nb_packets = 3600 * 25;

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

  519. 

  520.     if (!data_off)

  521.         data_off = avio_tell(pb) - 18;

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

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

  524.         rm_read_index(s);

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

  526.     }

  527. 

  528.     return 0;

  529. }

  530. 

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

  532. {

  533.     int n, n1;

  534. 

  535.     n = avio_rb16(pb);

  536.     (*len)-=2;

  537.     n &= 0x7FFF;

  538.     if (n >= 0x4000) {

  539.         return n - 0x4000;

  540.     } else {

  541.         n1 = avio_rb16(pb);

  542.         (*len)-=2;

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

  544.     }

  545. }

  546. 

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

  548. #define RAW_PACKET_SIZE 1000

  549. 

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

  551.     RMDemuxContext *rm = s->priv_data;

  552.     AVIOContext *pb = s->pb;

  553.     AVStream *st;

  554.     uint32_t state=0xFFFFFFFF;

  555. 

  556.     while(!pb->eof_reached){

  557.         int len, num, i;

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

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

  560.             num= rm->current_stream;

  561.             len= rm->remaining_len;

  562.             *timestamp = AV_NOPTS_VALUE;

  563.             *flags= 0;

  564.         }else{

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

  566. 

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

  568.                 int n_pkts, expected_len;

  569.                 len = avio_rb32(pb);

  570.                 avio_skip(pb, 2);

  571.                 n_pkts = avio_rb32(pb);

  572.                 expected_len = 20 + n_pkts * 14;

  573.                 if (len == 20)

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

  575.                     len = expected_len;

  576.                 else if (len != expected_len)

  577.                     av_log(s, AV_LOG_WARNING,

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

  579.                            len, n_pkts, expected_len);

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

  581.                 if(len<0)

  582.                     continue;

  583.                 goto skip;

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

  585.                 av_log(s, AV_LOG_WARNING,

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

  587.             }

  588. 

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

  590.                 continue;

  591.             len=state - 12;

  592.             state= 0xFFFFFFFF;

  593. 

  594.             num = avio_rb16(pb);

  595.             *timestamp = avio_rb32(pb);

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

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

  598.         }

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

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

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

  602.                 break;

  603.         }

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

  605. skip:

  606.             /* skip packet if unknown number */

  607.             avio_skip(pb, len);

  608.             rm->remaining_len = 0;

  609.             continue;

  610.         }

  611.         *stream_index= i;

  612. 

  613.         return len;

  614.     }

  615.     return -1;

  616. }

  617. 

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

  619.                                    RMDemuxContext *rm, RMStream *vst,

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

  621.                                    int64_t *timestamp)

  622. {

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

  624.     int type;

  625. 

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

  627.     type = hdr >> 6;

  628. 

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

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

  631.     }

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

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

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

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

  636.     }

  637.     if(len<0)

  638.         return -1;

  639.     rm->remaining_len = len;

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

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

  642.             len= len2;

  643.             *timestamp = pos;

  644.         }

  645.         if(rm->remaining_len < len)

  646.             return -1;

  647.         rm->remaining_len -= len;

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

  649.             return AVERROR(EIO);

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

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

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

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

  654.         return 0;

  655.     }

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

  657. 

  658.     *pseq = seq;

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

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

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

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

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

  664.             return AVERROR(ENOMEM);

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

  666.         vst->cur_slice = 0;

  667.         vst->curpic_num = pic_num;

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

  669.     }

  670.     if(type == 2)

  671.         len = FFMIN(len, pos);

  672. 

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

  674.         return 1;

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

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

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

  678.         return 1;

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

  680.         return AVERROR(EIO);

  681.     vst->videobufpos += len;

  682.     rm->remaining_len-= len;

  683. 

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

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

  686.         *pkt= vst->pkt;

  687.         vst->pkt.data= NULL;

  688.         vst->pkt.size= 0;

  689.         vst->pkt.buf = NULL;

  690. #if FF_API_DESTRUCT_PACKET

  691. FF_DISABLE_DEPRECATION_WARNINGS

  692.         vst->pkt.destruct = NULL;

  693. FF_ENABLE_DEPRECATION_WARNINGS

  694. #endif

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

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

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

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

  699.         pkt->pts = AV_NOPTS_VALUE;

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

  701.         vst->slices = 0;

  702.         return 0;

  703.     }

  704. 

  705.     return 1;

  706. }

  707. 

  708. static inline void

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

  710. {

  711.     uint8_t *ptr;

  712.     int j;

  713. 

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

  715.         ptr = pkt->data;

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

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

  718.             ptr += 2;

  719.         }

  720.     }

  721. }

  722. 

  723. int

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

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

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

  727. {

  728.     RMDemuxContext *rm = s->priv_data;

  729. 

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

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

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

  733.             return -1; //got partial frame

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

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

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

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

  738.             int x;

  739.             int sps = ast->sub_packet_size;

  740.             int cfs = ast->coded_framesize;

  741.             int h = ast->sub_packet_h;

  742.             int y = ast->sub_packet_cnt;

  743.             int w = ast->audio_framesize;

  744. 

  745.             if (flags & 2)

  746.                 y = ast->sub_packet_cnt = 0;

  747.             if (!y)

  748.                 ast->audiotimestamp = timestamp;

  749. 

  750.             switch (ast->deint_id) {

  751.                 case DEINT_ID_INT4:

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

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

  754.                     break;

  755.                 case DEINT_ID_GENR:

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

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

  758.                     break;

  759.                 case DEINT_ID_SIPR:

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

  761.                     break;

  762.             }

  763. 

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

  765.                 return -1;

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

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

  768. 

  769.              ast->sub_packet_cnt = 0;

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

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

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

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

  774.             int x;

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

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

  777.             if (ast->sub_packet_cnt) {

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

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

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

  781.                 ast->audiotimestamp = timestamp;

  782.             } else

  783.                 return -1;

  784.         } else {

  785.             av_get_packet(pb, pkt, len);

  786.             rm_ac3_swap_bytes(st, pkt);

  787.         }

  788.     } else

  789.         av_get_packet(pb, pkt, len);

  790. 

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

  792. 

  793. #if 0

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

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

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

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

  798. 

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

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

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

  802.         }

  803.     }

  804. #endif

  805. 

  806.     pkt->pts = timestamp;

  807.     if (flags & 2)

  808.         pkt->flags |= AV_PKT_FLAG_KEY;

  809. 

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

  811. }

  812. 

  813. int

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

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

  816. {

  817.     RMDemuxContext *rm = s->priv_data;

  818. 

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

  820. 

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

  822.         ast->deint_id == DEINT_ID_VBRS)

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

  824.     else {

  825.         int ret = av_new_packet(pkt, st->codec->block_align);

  826.         if (ret < 0)

  827.             return ret;

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

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

  830.                st->codec->block_align);

  831.     }

  832.     rm->audio_pkt_cnt--;

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

  834.         ast->audiotimestamp = AV_NOPTS_VALUE;

  835.         pkt->flags = AV_PKT_FLAG_KEY;

  836.     } else

  837.         pkt->flags = 0;

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

  839. 

  840.     return rm->audio_pkt_cnt;

  841. }

  842. 

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

  844. {

  845.     RMDemuxContext *rm = s->priv_data;

  846.     AVStream *st;

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

  848.     int64_t timestamp, pos;

  849.     int flags;

  850. 

  851.     for (;;) {

  852.         if (rm->audio_pkt_cnt) {

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

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

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

  856.             flags = 0;

  857.         } else {

  858.             if (rm->old_format) {

  859.                 RMStream *ast;

  860. 

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

  862.                 ast = st->priv_data;

  863.                 timestamp = AV_NOPTS_VALUE;

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

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

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

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

  868.             } else {

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

  870.                 if (len > 0)

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

  872.             }

  873. 

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

  875.                 return AVERROR(EIO);

  876. 

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

  878.                                       &seq, flags, timestamp);

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

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

  881.             if (res)

  882.                 continue;

  883.         }

  884. 

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

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

  887.             av_free_packet(pkt);

  888.         } else

  889.             break;

  890.     }

  891. 

  892.     return 0;

  893. }

  894. 

  895. static int rm_read_close(AVFormatContext *s)

  896. {

  897.     int i;

  898. 

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

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

  901. 

  902.     return 0;

  903. }

  904. 

  905. static int rm_probe(AVProbeData *p)

  906. {

  907.     /* check file header */

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

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

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

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

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

  913.         return AVPROBE_SCORE_MAX;

  914.     else

  915.         return 0;

  916. }

  917. 

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

  919.                                int64_t *ppos, int64_t pos_limit)

  920. {

  921.     RMDemuxContext *rm = s->priv_data;

  922.     int64_t pos, dts;

  923.     int stream_index2, flags, len, h;

  924. 

  925.     pos = *ppos;

  926. 

  927.     if(rm->old_format)

  928.         return AV_NOPTS_VALUE;

  929. 

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

  931.     rm->remaining_len=0;

  932.     for(;;){

  933.         int seq=1;

  934.         AVStream *st;

  935. 

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

  937.         if(len<0)

  938.             return AV_NOPTS_VALUE;

  939. 

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

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

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

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

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

  945.             }

  946.         }

  947. 

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

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

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

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

  952.             if(stream_index2 == stream_index)

  953.                 break;

  954.         }

  955. 

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

  957.     }

  958.     *ppos = pos;

  959.     return dts;

  960. }

  961. 

  962. AVInputFormat ff_rm_demuxer = {

  963.     .name           = "rm",

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

  965.     .priv_data_size = sizeof(RMDemuxContext),

  966.     .read_probe     = rm_probe,

  967.     .read_header    = rm_read_header,

  968.     .read_packet    = rm_read_packet,

  969.     .read_close     = rm_read_close,

  970.     .read_timestamp = rm_read_dts,

  971. };

  972. 

  973. AVInputFormat ff_rdt_demuxer = {

  974.     .name           = "rdt",

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

  976.     .priv_data_size = sizeof(RMDemuxContext),

  977.     .read_close     = rm_read_close,

  978.     .flags          = AVFMT_NOFILE,

  979. };