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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 {

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

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

  95.         return AVERROR(EIO);

  96.     return 0;

  97. }

  98. 

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

  100. {

  101.     char buf[1024];

  102.     int i;

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

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

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

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

  107.     }

  108. }

  109. 

  110. RMStream *ff_rm_alloc_rmstream (void)

  111. {

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

  113.     rms->curpic_num = -1;

  114.     return rms;

  115. }

  116. 

  117. void ff_rm_free_rmstream (RMStream *rms)

  118. {

  119.     av_free_packet(&rms->pkt);

  120. }

  121. 

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

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

  124. {

  125.     char buf[256];

  126.     uint32_t version;

  127.     int ret;

  128. 

  129.     /* ra type header */

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

  131.     if (version == 3) {

  132.         int header_size = avio_rb16(pb);

  133.         int64_t startpos = avio_tell(pb);

  134.         avio_skip(pb, 14);

  135.         rm_read_metadata(s, pb, 0);

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

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

  138.             avio_r8(pb);

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

  140.         }

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

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

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

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

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

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

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

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

  149.         ast->deint_id = DEINT_ID_INT0;

  150.     } else {

  151.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  152.         int codecdata_length;

  153.         /* old version (4) */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  168.         if (version == 5) {

  169.             avio_rb16(pb); avio_rb16(pb); avio_rb16(pb);

  170.         }

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

  172.         avio_rb32(pb);

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

  174.         if (version == 5) {

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

  176.             avio_read(pb, buf, 4);

  177.             buf[4] = 0;

  178.         } else {

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

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

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

  182.         }

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

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

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

  186.                                                 st->codec->codec_tag);

  187. 

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

  189.         case AV_CODEC_ID_AC3:

  190.             st->need_parsing = AVSTREAM_PARSE_FULL;

  191.             break;

  192.         case AV_CODEC_ID_RA_288:

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

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

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

  196.             break;

  197.         case AV_CODEC_ID_COOK:

  198.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  199.         case AV_CODEC_ID_ATRAC3:

  200.         case AV_CODEC_ID_SIPR:

  201.             avio_rb16(pb); avio_r8(pb);

  202.             if (version == 5)

  203.                 avio_r8(pb);

  204.             codecdata_length = avio_rb32(pb);

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

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

  207.                 return -1;

  208.             }

  209. 

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

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

  212.                 if (flavor > 3) {

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

  214.                            flavor);

  215.                     return -1;

  216.                 }

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

  218.             } else {

  219.                 if(sub_packet_size <= 0){

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

  221.                     return -1;

  222.                 }

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

  224.             }

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

  226.                 return ret;

  227.             break;

  228.         case AV_CODEC_ID_AAC:

  229.             avio_rb16(pb); avio_r8(pb);

  230.             if (version == 5)

  231.                 avio_r8(pb);

  232.             codecdata_length = avio_rb32(pb);

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

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

  235.                 return -1;

  236.             }

  237.             if (codecdata_length >= 1) {

  238.                 avio_r8(pb);

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

  240.                     return ret;

  241.             }

  242.             break;

  243.         default:

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

  245.         }

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

  247.             ast->deint_id == DEINT_ID_GENR ||

  248.             ast->deint_id == DEINT_ID_SIPR) {

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

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

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

  252.                 return AVERROR_INVALIDDATA;

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

  254.                 return AVERROR(ENOMEM);

  255.         }

  256.         switch (ast->deint_id) {

  257.         case DEINT_ID_INT4:

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

  259.                 sub_packet_h <= 1 ||

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

  261.                 return AVERROR_INVALIDDATA;

  262.             break;

  263.         case DEINT_ID_GENR:

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

  265.                 ast->sub_packet_size > ast->audio_framesize)

  266.                 return AVERROR_INVALIDDATA;

  267.             break;

  268.         case DEINT_ID_SIPR:

  269.         case DEINT_ID_INT0:

  270.         case DEINT_ID_VBRS:

  271.         case DEINT_ID_VBRF:

  272.             break;

  273.         default:

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

  275.             return AVERROR_INVALIDDATA;

  276.         }

  277. 

  278.         if (read_all) {

  279.             avio_r8(pb);

  280.             avio_r8(pb);

  281.             avio_r8(pb);

  282.             rm_read_metadata(s, pb, 0);

  283.         }

  284.     }

  285.     return 0;

  286. }

  287. 

  288. int

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

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

  291. {

  292.     unsigned int v;

  293.     int size;

  294.     int64_t codec_pos;

  295.     int ret;

  296. 

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

  298.     codec_pos = avio_tell(pb);

  299.     v = avio_rb32(pb);

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

  301.         /* ra type header */

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

  303.             return -1;

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

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

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

  307.             return ret;

  308. 

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

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

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

  312.                                                 st->codec->codec_tag);

  313.     } else {

  314.         int fps;

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

  316.         fail1:

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

  318.             goto skip;

  319.         }

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

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

  322.                                                st->codec->codec_tag);

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

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

  325.             goto fail1;

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

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

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

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

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

  331.         st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  332.         fps = avio_rb32(pb);

  333. 

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

  335.             return ret;

  336. 

  337.         if (fps > 0) {

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

  339.                       0x10000, fps, (1 << 30) - 1);

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

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

  342.             return AVERROR_INVALIDDATA;

  343.         }

  344.     }

  345. 

  346. skip:

  347.     /* skip codec info */

  348.     size = avio_tell(pb) - codec_pos;

  349.     avio_skip(pb, codec_data_size - size);

  350. 

  351.     return 0;

  352. }

  353. 

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

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

  356. static int rm_read_index(AVFormatContext *s)

  357. {

  358.     AVIOContext *pb = s->pb;

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

  360.     AVStream *st;

  361. 

  362.     do {

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

  364.             return -1;

  365.         size     = avio_rb32(pb);

  366.         if (size < 20)

  367.             return -1;

  368.         avio_skip(pb, 2);

  369.         n_pkts   = avio_rb32(pb);

  370.         str_id   = avio_rb16(pb);

  371.         next_off = avio_rb32(pb);

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

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

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

  375.                 break;

  376.             }

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

  378.             av_log(s, AV_LOG_ERROR,

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

  380.                    str_id, avio_tell(pb));

  381.             goto skip;

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

  383.             av_log(s, AV_LOG_ERROR,

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

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

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

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

  388.             goto skip;

  389.         }

  390. 

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

  392.             avio_skip(pb, 2);

  393.             pts = avio_rb32(pb);

  394.             pos = avio_rb32(pb);

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

  396. 

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

  398.         }

  399. 

  400. skip:

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

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

  403.             av_log(s, AV_LOG_ERROR,

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

  405.             return -1;

  406.         }

  407.     } while (next_off);

  408. 

  409.     return 0;

  410. }

  411. 

  412. static int rm_read_header_old(AVFormatContext *s)

  413. {

  414.     RMDemuxContext *rm = s->priv_data;

  415.     AVStream *st;

  416. 

  417.     rm->old_format = 1;

  418.     st = avformat_new_stream(s, NULL);

  419.     if (!st)

  420.         return -1;

  421.     st->priv_data = ff_rm_alloc_rmstream();

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

  423. }

  424. 

  425. static int rm_read_header(AVFormatContext *s)

  426. {

  427.     RMDemuxContext *rm = s->priv_data;

  428.     AVStream *st;

  429.     AVIOContext *pb = s->pb;

  430.     unsigned int tag;

  431.     int tag_size;

  432.     unsigned int start_time, duration;

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

  434.     char buf[128];

  435.     int flags = 0;

  436. 

  437.     tag = avio_rl32(pb);

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

  439.         /* very old .ra format */

  440.         return rm_read_header_old(s);

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

  442.         return AVERROR(EIO);

  443.     }

  444. 

  445.     tag_size = avio_rb32(pb);

  446.     avio_skip(pb, tag_size - 8);

  447. 

  448.     for(;;) {

  449.         if (pb->eof_reached)

  450.             return -1;

  451.         tag = avio_rl32(pb);

  452.         tag_size = avio_rb32(pb);

  453.         avio_rb16(pb);

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

  455.                 (tag      ) & 0xff,

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

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

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

  459.                 tag,

  460.                 tag_size);

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

  462.             return -1;

  463.         switch(tag) {

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

  465.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

  477.             break;

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

  479.             rm_read_metadata(s, pb, 1);

  480.             break;

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

  482.             st = avformat_new_stream(s, NULL);

  483.             if (!st)

  484.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  493.             st->start_time = start_time;

  494.             st->duration = duration;

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

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

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

  498.             st->priv_data = ff_rm_alloc_rmstream();

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

  500.                                           avio_rb32(pb)) < 0)

  501.                 return -1;

  502.             break;

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

  504.             goto header_end;

  505.         default:

  506.             /* unknown tag: skip it */

  507.             avio_skip(pb, tag_size - 10);

  508.             break;

  509.         }

  510.     }

  511.  header_end:

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

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

  514.         rm->nb_packets = 3600 * 25;

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

  516. 

  517.     if (!data_off)

  518.         data_off = avio_tell(pb) - 18;

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

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

  521.         rm_read_index(s);

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

  523.     }

  524. 

  525.     return 0;

  526. }

  527. 

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

  529. {

  530.     int n, n1;

  531. 

  532.     n = avio_rb16(pb);

  533.     (*len)-=2;

  534.     n &= 0x7FFF;

  535.     if (n >= 0x4000) {

  536.         return n - 0x4000;

  537.     } else {

  538.         n1 = avio_rb16(pb);

  539.         (*len)-=2;

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

  541.     }

  542. }

  543. 

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

  545. #define RAW_PACKET_SIZE 1000

  546. 

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

  548.     RMDemuxContext *rm = s->priv_data;

  549.     AVIOContext *pb = s->pb;

  550.     AVStream *st;

  551.     uint32_t state=0xFFFFFFFF;

  552. 

  553.     while(!pb->eof_reached){

  554.         int len, num, i;

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

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

  557.             num= rm->current_stream;

  558.             len= rm->remaining_len;

  559.             *timestamp = AV_NOPTS_VALUE;

  560.             *flags= 0;

  561.         }else{

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

  563. 

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

  565.                 int n_pkts, expected_len;

  566.                 len = avio_rb32(pb);

  567.                 avio_skip(pb, 2);

  568.                 n_pkts = avio_rb32(pb);

  569.                 expected_len = 20 + n_pkts * 14;

  570.                 if (len == 20)

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

  572.                     len = expected_len;

  573.                 else if (len != expected_len)

  574.                     av_log(s, AV_LOG_WARNING,

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

  576.                            len, n_pkts, expected_len);

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

  578.                 if(len<0)

  579.                     continue;

  580.                 goto skip;

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

  582.                 av_log(s, AV_LOG_WARNING,

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

  584.             }

  585. 

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

  587.                 continue;

  588.             len=state - 12;

  589.             state= 0xFFFFFFFF;

  590. 

  591.             num = avio_rb16(pb);

  592.             *timestamp = avio_rb32(pb);

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

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

  595.         }

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

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

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

  599.                 break;

  600.         }

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

  602. skip:

  603.             /* skip packet if unknown number */

  604.             avio_skip(pb, len);

  605.             rm->remaining_len = 0;

  606.             continue;

  607.         }

  608.         *stream_index= i;

  609. 

  610.         return len;

  611.     }

  612.     return -1;

  613. }

  614. 

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

  616.                                    RMDemuxContext *rm, RMStream *vst,

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

  618.                                    int64_t *timestamp)

  619. {

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

  621.     int type;

  622. 

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

  624.     type = hdr >> 6;

  625. 

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

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

  628.     }

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

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

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

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

  633.     }

  634.     if(len<0)

  635.         return -1;

  636.     rm->remaining_len = len;

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

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

  639.             len= len2;

  640.             *timestamp = pos;

  641.         }

  642.         if(rm->remaining_len < len)

  643.             return -1;

  644.         rm->remaining_len -= len;

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

  646.             return AVERROR(EIO);

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

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

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

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

  651.         return 0;

  652.     }

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

  654. 

  655.     *pseq = seq;

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

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

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

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

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

  661.             return AVERROR(ENOMEM);

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

  663.         vst->cur_slice = 0;

  664.         vst->curpic_num = pic_num;

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

  666.     }

  667.     if(type == 2)

  668.         len = FFMIN(len, pos);

  669. 

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

  671.         return 1;

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

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

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

  675.         return 1;

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

  677.         return AVERROR(EIO);

  678.     vst->videobufpos += len;

  679.     rm->remaining_len-= len;

  680. 

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

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

  683.         *pkt= vst->pkt;

  684.         vst->pkt.data= NULL;

  685.         vst->pkt.size= 0;

  686.         vst->pkt.buf = NULL;

  687. #if FF_API_DESTRUCT_PACKET

  688. FF_DISABLE_DEPRECATION_WARNINGS

  689.         vst->pkt.destruct = NULL;

  690. FF_ENABLE_DEPRECATION_WARNINGS

  691. #endif

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

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

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

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

  696.         pkt->pts = AV_NOPTS_VALUE;

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

  698.         vst->slices = 0;

  699.         return 0;

  700.     }

  701. 

  702.     return 1;

  703. }

  704. 

  705. static inline void

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

  707. {

  708.     uint8_t *ptr;

  709.     int j;

  710. 

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

  712.         ptr = pkt->data;

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

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

  715.             ptr += 2;

  716.         }

  717.     }

  718. }

  719. 

  720. int

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

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

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

  724. {

  725.     RMDemuxContext *rm = s->priv_data;

  726. 

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

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

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

  730.             return -1; //got partial frame

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

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

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

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

  735.             int x;

  736.             int sps = ast->sub_packet_size;

  737.             int cfs = ast->coded_framesize;

  738.             int h = ast->sub_packet_h;

  739.             int y = ast->sub_packet_cnt;

  740.             int w = ast->audio_framesize;

  741. 

  742.             if (flags & 2)

  743.                 y = ast->sub_packet_cnt = 0;

  744.             if (!y)

  745.                 ast->audiotimestamp = timestamp;

  746. 

  747.             switch (ast->deint_id) {

  748.                 case DEINT_ID_INT4:

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

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

  751.                     break;

  752.                 case DEINT_ID_GENR:

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

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

  755.                     break;

  756.                 case DEINT_ID_SIPR:

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

  758.                     break;

  759.             }

  760. 

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

  762.                 return -1;

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

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

  765. 

  766.              ast->sub_packet_cnt = 0;

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

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

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

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

  771.             int x;

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

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

  774.             if (ast->sub_packet_cnt) {

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

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

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

  778.                 ast->audiotimestamp = timestamp;

  779.             } else

  780.                 return -1;

  781.         } else {

  782.             av_get_packet(pb, pkt, len);

  783.             rm_ac3_swap_bytes(st, pkt);

  784.         }

  785.     } else

  786.         av_get_packet(pb, pkt, len);

  787. 

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

  789. 

  790. #if 0

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

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

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

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

  795. 

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

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

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

  799.         }

  800.     }

  801. #endif

  802. 

  803.     pkt->pts = timestamp;

  804.     if (flags & 2)

  805.         pkt->flags |= AV_PKT_FLAG_KEY;

  806. 

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

  808. }

  809. 

  810. int

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

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

  813. {

  814.     RMDemuxContext *rm = s->priv_data;

  815. 

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

  817. 

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

  819.         ast->deint_id == DEINT_ID_VBRS)

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

  821.     else {

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

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

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

  825.                st->codec->block_align);

  826.     }

  827.     rm->audio_pkt_cnt--;

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

  829.         ast->audiotimestamp = AV_NOPTS_VALUE;

  830.         pkt->flags = AV_PKT_FLAG_KEY;

  831.     } else

  832.         pkt->flags = 0;

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

  834. 

  835.     return rm->audio_pkt_cnt;

  836. }

  837. 

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

  839. {

  840.     RMDemuxContext *rm = s->priv_data;

  841.     AVStream *st;

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

  843.     int64_t timestamp, pos;

  844.     int flags;

  845. 

  846.     for (;;) {

  847.         if (rm->audio_pkt_cnt) {

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

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

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

  851.             flags = 0;

  852.         } else {

  853.             if (rm->old_format) {

  854.                 RMStream *ast;

  855. 

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

  857.                 ast = st->priv_data;

  858.                 timestamp = AV_NOPTS_VALUE;

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

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

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

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

  863.             } else {

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

  865.                 if (len > 0)

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

  867.             }

  868. 

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

  870.                 return AVERROR(EIO);

  871. 

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

  873.                                       &seq, flags, timestamp);

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

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

  876.             if (res)

  877.                 continue;

  878.         }

  879. 

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

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

  882.             av_free_packet(pkt);

  883.         } else

  884.             break;

  885.     }

  886. 

  887.     return 0;

  888. }

  889. 

  890. static int rm_read_close(AVFormatContext *s)

  891. {

  892.     int i;

  893. 

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

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

  896. 

  897.     return 0;

  898. }

  899. 

  900. static int rm_probe(AVProbeData *p)

  901. {

  902.     /* check file header */

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

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

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

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

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

  908.         return AVPROBE_SCORE_MAX;

  909.     else

  910.         return 0;

  911. }

  912. 

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

  914.                                int64_t *ppos, int64_t pos_limit)

  915. {

  916.     RMDemuxContext *rm = s->priv_data;

  917.     int64_t pos, dts;

  918.     int stream_index2, flags, len, h;

  919. 

  920.     pos = *ppos;

  921. 

  922.     if(rm->old_format)

  923.         return AV_NOPTS_VALUE;

  924. 

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

  926.     rm->remaining_len=0;

  927.     for(;;){

  928.         int seq=1;

  929.         AVStream *st;

  930. 

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

  932.         if(len<0)

  933.             return AV_NOPTS_VALUE;

  934. 

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

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

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

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

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

  940.             }

  941.         }

  942. 

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

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

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

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

  947.             if(stream_index2 == stream_index)

  948.                 break;

  949.         }

  950. 

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

  952.     }

  953.     *ppos = pos;

  954.     return dts;

  955. }

  956. 

  957. AVInputFormat ff_rm_demuxer = {

  958.     .name           = "rm",

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

  960.     .priv_data_size = sizeof(RMDemuxContext),

  961.     .read_probe     = rm_probe,

  962.     .read_header    = rm_read_header,

  963.     .read_packet    = rm_read_packet,

  964.     .read_close     = rm_read_close,

  965.     .read_timestamp = rm_read_dts,

  966. };

  967. 

  968. AVInputFormat ff_rdt_demuxer = {

  969.     .name           = "rdt",

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

  971.     .priv_data_size = sizeof(RMDemuxContext),

  972.     .read_close     = rm_read_close,

  973.     .flags          = AVFMT_NOFILE,

  974. };