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FFmpeg/libavformat/rmdec.c

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  1. /*

  2.  * "Real" compatible demuxer.

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

  4.  *

  5.  * This file is part of Libav.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. #include "libavutil/avstring.h"

  23. #include "libavutil/intreadwrite.h"

  24. #include "libavutil/dict.h"

  25. #include "avformat.h"

  26. #include "internal.h"

  27. #include "riff.h"

  28. #include "rm.h"

  29. 

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

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

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

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

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

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

  36. 

  37. struct RMStream {

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

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

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

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

  42.     int cur_slice, slices;

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

  44.     /// Audio descrambling matrix parameters

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

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

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

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

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

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

  51. };

  52. 

  53. typedef struct {

  54.     int nb_packets;

  55.     int old_format;

  56.     int current_stream;

  57.     int remaining_len;

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

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

  60. } RMDemuxContext;

  61. 

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

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

  64.     {  5, 81 }, {  7, 31 }, {  8, 86 }, {  9, 58 },

  65.     { 10, 36 }, { 12, 68 }, { 13, 39 }, { 14, 73 },

  66.     { 15, 53 }, { 16, 69 }, { 17, 57 }, { 19, 88 },

  67.     { 20, 34 }, { 21, 71 }, { 24, 46 }, { 25, 94 },

  68.     { 26, 54 }, { 28, 75 }, { 29, 50 }, { 32, 70 },

  69.     { 33, 92 }, { 35, 74 }, { 38, 85 }, { 40, 56 },

  70.     { 42, 87 }, { 43, 65 }, { 45, 59 }, { 48, 79 },

  71.     { 49, 93 }, { 51, 89 }, { 55, 95 }, { 61, 76 },

  72.     { 67, 83 }, { 77, 80 }

  73. };

  74. 

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

  76. 

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

  78. {

  79.     int i;

  80.     char *q, r;

  81. 

  82.     q = buf;

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

  84.         r = avio_r8(pb);

  85.         if (i < buf_size - 1)

  86.             *q++ = r;

  87.     }

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

  89. }

  90. 

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

  92. {

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

  94. }

  95. 

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

  97. {

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

  99.         return -1;

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

  101.     if (!avctx->extradata)

  102.         return AVERROR(ENOMEM);

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

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

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

  106.         return AVERROR(EIO);

  107.     return 0;

  108. }

  109. 

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

  111. {

  112.     char buf[1024];

  113.     int i;

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

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

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

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

  118.     }

  119. }

  120. 

  121. RMStream *ff_rm_alloc_rmstream (void)

  122. {

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

  124.     rms->curpic_num = -1;

  125.     return rms;

  126. }

  127. 

  128. void ff_rm_free_rmstream (RMStream *rms)

  129. {

  130.     av_free_packet(&rms->pkt);

  131. }

  132. 

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

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

  135. {

  136.     char buf[256];

  137.     uint32_t version;

  138.     int ret;

  139. 

  140.     /* ra type header */

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

  142.     if (version == 3) {

  143.         int header_size = avio_rb16(pb);

  144.         int64_t startpos = avio_tell(pb);

  145.         avio_skip(pb, 14);

  146.         rm_read_metadata(s, 0);

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

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

  149.             avio_r8(pb);

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

  151.         }

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

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

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

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

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

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

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

  159.         ast->deint_id = DEINT_ID_INT0;

  160.     } else {

  161.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  162.         int codecdata_length;

  163.         /* old version (4) */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  178.         if (version == 5) {

  179.             avio_rb16(pb); avio_rb16(pb); avio_rb16(pb);

  180.         }

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

  182.         avio_rb32(pb);

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

  184.         if (version == 5) {

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

  186.             avio_read(pb, buf, 4);

  187.             buf[4] = 0;

  188.         } else {

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

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

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

  192.         }

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

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

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

  196.                                                 st->codec->codec_tag);

  197. 

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

  199.         case CODEC_ID_AC3:

  200.             st->need_parsing = AVSTREAM_PARSE_FULL;

  201.             break;

  202.         case CODEC_ID_RA_288:

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

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

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

  206.             break;

  207.         case CODEC_ID_COOK:

  208.         case CODEC_ID_ATRAC3:

  209.         case CODEC_ID_SIPR:

  210.             avio_rb16(pb); avio_r8(pb);

  211.             if (version == 5)

  212.                 avio_r8(pb);

  213.             codecdata_length = avio_rb32(pb);

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

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

  216.                 return -1;

  217.             }

  218. 

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

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

  221.                 if (flavor > 3) {

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

  223.                            flavor);

  224.                     return -1;

  225.                 }

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

  227.             } else {

  228.                 if(sub_packet_size <= 0){

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

  230.                     return -1;

  231.                 }

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

  233.             }

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

  235.                 return ret;

  236.             break;

  237.         case CODEC_ID_AAC:

  238.             avio_rb16(pb); avio_r8(pb);

  239.             if (version == 5)

  240.                 avio_r8(pb);

  241.             codecdata_length = avio_rb32(pb);

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

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

  244.                 return -1;

  245.             }

  246.             if (codecdata_length >= 1) {

  247.                 avio_r8(pb);

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

  249.                     return ret;

  250.             }

  251.             break;

  252.         default:

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

  254.         }

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

  256.             ast->deint_id == DEINT_ID_GENR ||

  257.             ast->deint_id == DEINT_ID_SIPR) {

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

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

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

  261.                 return AVERROR_INVALIDDATA;

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

  263.                 return AVERROR(ENOMEM);

  264.         }

  265.         switch (ast->deint_id) {

  266.         case DEINT_ID_INT4:

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

  268.                 sub_packet_h <= 1 ||

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

  270.                 return AVERROR_INVALIDDATA;

  271.             break;

  272.         case DEINT_ID_GENR:

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

  274.                 ast->sub_packet_size > ast->audio_framesize)

  275.                 return AVERROR_INVALIDDATA;

  276.             break;

  277.         case DEINT_ID_SIPR:

  278.         case DEINT_ID_INT0:

  279.         case DEINT_ID_VBRS:

  280.         case DEINT_ID_VBRF:

  281.             break;

  282.         default:

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

  284.             return AVERROR_INVALIDDATA;

  285.         }

  286. 

  287.         if (read_all) {

  288.             avio_r8(pb);

  289.             avio_r8(pb);

  290.             avio_r8(pb);

  291.             rm_read_metadata(s, 0);

  292.         }

  293.     }

  294.     return 0;

  295. }

  296. 

  297. int

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

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

  300. {

  301.     unsigned int v;

  302.     int size;

  303.     int64_t codec_pos;

  304.     int ret;

  305. 

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

  307.     codec_pos = avio_tell(pb);

  308.     v = avio_rb32(pb);

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

  310.         /* ra type header */

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

  312.             return -1;

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

  324.         if (st->codec->codec_id == 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.         av_reduce(&st->r_frame_rate.den, &st->r_frame_rate.num,

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

  339.         st->avg_frame_rate = st->r_frame_rate;

  340.     }

  341. 

  342. skip:

  343.     /* skip codec info */

  344.     size = avio_tell(pb) - codec_pos;

  345.     avio_skip(pb, codec_data_size - size);

  346. 

  347.     return 0;

  348. }

  349. 

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

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

  352. static int rm_read_index(AVFormatContext *s)

  353. {

  354.     AVIOContext *pb = s->pb;

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

  356.     AVStream *st;

  357. 

  358.     do {

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

  360.             return -1;

  361.         size     = avio_rb32(pb);

  362.         if (size < 20)

  363.             return -1;

  364.         avio_skip(pb, 2);

  365.         n_pkts   = avio_rb32(pb);

  366.         str_id   = avio_rb16(pb);

  367.         next_off = avio_rb32(pb);

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

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

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

  371.                 break;

  372.             }

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

  374.             av_log(s, AV_LOG_ERROR,

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

  376.                    str_id, avio_tell(pb));

  377.             goto skip;

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

  379.             av_log(s, AV_LOG_ERROR,

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

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

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

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

  384.             goto skip;

  385.         }

  386. 

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

  388.             avio_skip(pb, 2);

  389.             pts = avio_rb32(pb);

  390.             pos = avio_rb32(pb);

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

  392. 

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

  394.         }

  395. 

  396. skip:

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

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

  399.             av_log(s, AV_LOG_ERROR,

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

  401.             return -1;

  402.         }

  403.     } while (next_off);

  404. 

  405.     return 0;

  406. }

  407. 

  408. static int rm_read_header_old(AVFormatContext *s)

  409. {

  410.     RMDemuxContext *rm = s->priv_data;

  411.     AVStream *st;

  412. 

  413.     rm->old_format = 1;

  414.     st = avformat_new_stream(s, NULL);

  415.     if (!st)

  416.         return -1;

  417.     st->priv_data = ff_rm_alloc_rmstream();

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

  419. }

  420. 

  421. static int rm_read_header(AVFormatContext *s)

  422. {

  423.     RMDemuxContext *rm = s->priv_data;

  424.     AVStream *st;

  425.     AVIOContext *pb = s->pb;

  426.     unsigned int tag;

  427.     int tag_size;

  428.     unsigned int start_time, duration;

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

  430.     char buf[128];

  431.     int flags = 0;

  432. 

  433.     tag = avio_rl32(pb);

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

  435.         /* very old .ra format */

  436.         return rm_read_header_old(s);

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

  438.         return AVERROR(EIO);

  439.     }

  440. 

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

  442.     avio_rb16(pb);

  443.     avio_rb32(pb);

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

  445. 

  446.     for(;;) {

  447.         if (pb->eof_reached)

  448.             return -1;

  449.         tag = avio_rl32(pb);

  450.         tag_size = avio_rb32(pb);

  451.         avio_rb16(pb);

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

  453.                 (tag      ) & 0xff,

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

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

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

  457.                 tag,

  458.                 tag_size);

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

  460.             return -1;

  461.         switch(tag) {

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

  463.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

  475.             break;

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

  477.             rm_read_metadata(s, 1);

  478.             break;

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

  480.             st = avformat_new_stream(s, NULL);

  481.             if (!st)

  482.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  491.             st->start_time = start_time;

  492.             st->duration = duration;

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

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

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

  496.             st->priv_data = ff_rm_alloc_rmstream();

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

  498.                                           avio_rb32(pb)) < 0)

  499.                 return -1;

  500.             break;

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

  502.             goto header_end;

  503.         default:

  504.             /* unknown tag: skip it */

  505.             avio_skip(pb, tag_size - 10);

  506.             break;

  507.         }

  508.     }

  509.  header_end:

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

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

  512.         rm->nb_packets = 3600 * 25;

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

  514. 

  515.     if (!data_off)

  516.         data_off = avio_tell(pb) - 18;

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

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

  519.         rm_read_index(s);

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

  521.     }

  522. 

  523.     return 0;

  524. }

  525. 

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

  527. {

  528.     int n, n1;

  529. 

  530.     n = avio_rb16(pb);

  531.     (*len)-=2;

  532.     n &= 0x7FFF;

  533.     if (n >= 0x4000) {

  534.         return n - 0x4000;

  535.     } else {

  536.         n1 = avio_rb16(pb);

  537.         (*len)-=2;

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

  539.     }

  540. }

  541. 

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

  543. #define RAW_PACKET_SIZE 1000

  544. 

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

  546.     RMDemuxContext *rm = s->priv_data;

  547.     AVIOContext *pb = s->pb;

  548.     AVStream *st;

  549.     uint32_t state=0xFFFFFFFF;

  550. 

  551.     while(!pb->eof_reached){

  552.         int len, num, i;

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

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

  555.             num= rm->current_stream;

  556.             len= rm->remaining_len;

  557.             *timestamp = AV_NOPTS_VALUE;

  558.             *flags= 0;

  559.         }else{

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

  561. 

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

  563.                 int n_pkts, expected_len;

  564.                 len = avio_rb32(pb);

  565.                 avio_skip(pb, 2);

  566.                 n_pkts = avio_rb32(pb);

  567.                 expected_len = 20 + n_pkts * 14;

  568.                 if (len == 20)

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

  570.                     len = expected_len;

  571.                 else if (len != expected_len)

  572.                     av_log(s, AV_LOG_WARNING,

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

  574.                            len, n_pkts, expected_len);

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

  576.                 if(len<0)

  577.                     continue;

  578.                 goto skip;

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

  580.                 av_log(s, AV_LOG_WARNING,

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

  582.             }

  583. 

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

  585.                 continue;

  586.             len=state - 12;

  587.             state= 0xFFFFFFFF;

  588. 

  589.             num = avio_rb16(pb);

  590.             *timestamp = avio_rb32(pb);

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

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

  593.         }

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

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

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

  597.                 break;

  598.         }

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

  600. skip:

  601.             /* skip packet if unknown number */

  602.             avio_skip(pb, len);

  603.             rm->remaining_len = 0;

  604.             continue;

  605.         }

  606.         *stream_index= i;

  607. 

  608.         return len;

  609.     }

  610.     return -1;

  611. }

  612. 

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

  614.                                    RMDemuxContext *rm, RMStream *vst,

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

  616.                                    int64_t *timestamp)

  617. {

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

  619.     int type;

  620. 

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

  622.     type = hdr >> 6;

  623. 

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

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

  626.     }

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

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

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

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

  631.     }

  632.     if(len<0)

  633.         return -1;

  634.     rm->remaining_len = len;

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

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

  637.             len= len2;

  638.             *timestamp = pos;

  639.         }

  640.         if(rm->remaining_len < len)

  641.             return -1;

  642.         rm->remaining_len -= len;

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

  644.             return AVERROR(EIO);

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

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

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

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

  649.         return 0;

  650.     }

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

  652. 

  653.     *pseq = seq;

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

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

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

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

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

  659.             return AVERROR(ENOMEM);

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

  661.         vst->cur_slice = 0;

  662.         vst->curpic_num = pic_num;

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

  664.     }

  665.     if(type == 2)

  666.         len = FFMIN(len, pos);

  667. 

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

  669.         return 1;

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

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

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

  673.         return 1;

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

  675.         return AVERROR(EIO);

  676.     vst->videobufpos += len;

  677.     rm->remaining_len-= len;

  678. 

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

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

  681.         *pkt= vst->pkt;

  682.         vst->pkt.data= NULL;

  683.         vst->pkt.size= 0;

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

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

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

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

  688.         pkt->pts = AV_NOPTS_VALUE;

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

  690.         vst->slices = 0;

  691.         return 0;

  692.     }

  693. 

  694.     return 1;

  695. }

  696. 

  697. static inline void

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

  699. {

  700.     uint8_t *ptr;

  701.     int j;

  702. 

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

  704.         ptr = pkt->data;

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

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

  707.             ptr += 2;

  708.         }

  709.     }

  710. }

  711. 

  712. /**

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

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

  715.  */

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

  717. {

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

  719. 

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

  721.         int j;

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

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

  724. 

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

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

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

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

  729. 

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

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

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

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

  734.         }

  735.     }

  736. }

  737. 

  738. int

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

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

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

  742. {

  743.     RMDemuxContext *rm = s->priv_data;

  744. 

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

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

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

  748.             return -1; //got partial frame

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

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

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

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

  753.             int x;

  754.             int sps = ast->sub_packet_size;

  755.             int cfs = ast->coded_framesize;

  756.             int h = ast->sub_packet_h;

  757.             int y = ast->sub_packet_cnt;

  758.             int w = ast->audio_framesize;

  759. 

  760.             if (flags & 2)

  761.                 y = ast->sub_packet_cnt = 0;

  762.             if (!y)

  763.                 ast->audiotimestamp = timestamp;

  764. 

  765.             switch (ast->deint_id) {

  766.                 case DEINT_ID_INT4:

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

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

  769.                     break;

  770.                 case DEINT_ID_GENR:

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

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

  773.                     break;

  774.                 case DEINT_ID_SIPR:

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

  776.                     break;

  777.             }

  778. 

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

  780.                 return -1;

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

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

  783. 

  784.              ast->sub_packet_cnt = 0;

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

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

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

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

  789.             int x;

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

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

  792.             if (ast->sub_packet_cnt) {

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

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

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

  796.                 ast->audiotimestamp = timestamp;

  797.             } else

  798.                 return -1;

  799.         } else {

  800.             av_get_packet(pb, pkt, len);

  801.             rm_ac3_swap_bytes(st, pkt);

  802.         }

  803.     } else

  804.         av_get_packet(pb, pkt, len);

  805. 

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

  807. 

  808. #if 0

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

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

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

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

  813. 

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

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

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

  817.         }

  818.     }

  819. #endif

  820. 

  821.     pkt->pts = timestamp;

  822.     if (flags & 2)

  823.         pkt->flags |= AV_PKT_FLAG_KEY;

  824. 

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

  826. }

  827. 

  828. int

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

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

  831. {

  832.     RMDemuxContext *rm = s->priv_data;

  833. 

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

  835. 

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

  837.         ast->deint_id == DEINT_ID_VBRS)

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

  839.     else {

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

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

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

  843.                st->codec->block_align);

  844.     }

  845.     rm->audio_pkt_cnt--;

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

  847.         ast->audiotimestamp = AV_NOPTS_VALUE;

  848.         pkt->flags = AV_PKT_FLAG_KEY;

  849.     } else

  850.         pkt->flags = 0;

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

  852. 

  853.     return rm->audio_pkt_cnt;

  854. }

  855. 

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

  857. {

  858.     RMDemuxContext *rm = s->priv_data;

  859.     AVStream *st;

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

  861.     int64_t timestamp, pos;

  862.     int flags;

  863. 

  864.     for (;;) {

  865.         if (rm->audio_pkt_cnt) {

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

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

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

  869.             flags = 0;

  870.         } else {

  871.             if (rm->old_format) {

  872.                 RMStream *ast;

  873. 

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

  875.                 ast = st->priv_data;

  876.                 timestamp = AV_NOPTS_VALUE;

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

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

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

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

  881.             } else {

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

  883.                 if (len > 0)

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

  885.             }

  886. 

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

  888.                 return AVERROR(EIO);

  889. 

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

  891.                                       &seq, flags, timestamp);

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

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

  894.             if (res)

  895.                 continue;

  896.         }

  897. 

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

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

  900.             av_free_packet(pkt);

  901.         } else

  902.             break;

  903.     }

  904. 

  905.     return 0;

  906. }

  907. 

  908. static int rm_read_close(AVFormatContext *s)

  909. {

  910.     int i;

  911. 

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

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

  914. 

  915.     return 0;

  916. }

  917. 

  918. static int rm_probe(AVProbeData *p)

  919. {

  920.     /* check file header */

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

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

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

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

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

  926.         return AVPROBE_SCORE_MAX;

  927.     else

  928.         return 0;

  929. }

  930. 

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

  932.                                int64_t *ppos, int64_t pos_limit)

  933. {

  934.     RMDemuxContext *rm = s->priv_data;

  935.     int64_t pos, dts;

  936.     int stream_index2, flags, len, h;

  937. 

  938.     pos = *ppos;

  939. 

  940.     if(rm->old_format)

  941.         return AV_NOPTS_VALUE;

  942. 

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

  944.     rm->remaining_len=0;

  945.     for(;;){

  946.         int seq=1;

  947.         AVStream *st;

  948. 

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

  950.         if(len<0)

  951.             return AV_NOPTS_VALUE;

  952. 

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

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

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

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

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

  958.             }

  959.         }

  960. 

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

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

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

  964.             if(stream_index2 == stream_index)

  965.                 break;

  966.         }

  967. 

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

  969.     }

  970.     *ppos = pos;

  971.     return dts;

  972. }

  973. 

  974. AVInputFormat ff_rm_demuxer = {

  975.     .name           = "rm",

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

  977.     .priv_data_size = sizeof(RMDemuxContext),

  978.     .read_probe     = rm_probe,

  979.     .read_header    = rm_read_header,

  980.     .read_packet    = rm_read_packet,

  981.     .read_close     = rm_read_close,

  982.     .read_timestamp = rm_read_dts,

  983. };

  984. 

  985. AVInputFormat ff_rdt_demuxer = {

  986.     .name           = "rdt",

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

  988.     .priv_data_size = sizeof(RMDemuxContext),

  989.     .read_close     = rm_read_close,

  990.     .flags          = AVFMT_NOFILE,

  991. };