falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
28882 Commits
32 Branches
698MB
Tree: 2c6fb9f032
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '2c6fb9f032'
${ noResults }
FFmpeg/libavformat/rmdec.c

957 lines
31KB
Raw Blame History 

  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 "avformat.h"

  25. #include "riff.h"

  26. #include "rm.h"

  27. 

  28. struct RMStream {

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

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

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

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

  33.     int cur_slice, slices;

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

  35.     /// Audio descrambling matrix parameters

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

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

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

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

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

  41. };

  42. 

  43. typedef struct {

  44.     int nb_packets;

  45.     int old_format;

  46.     int current_stream;

  47.     int remaining_len;

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

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

  50. } RMDemuxContext;

  51. 

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

  53.     {  0, 63 }, {  1, 22 }, {  2, 44 }, {  3, 90 },

  54.     {  5, 81 }, {  7, 31 }, {  8, 86 }, {  9, 58 },

  55.     { 10, 36 }, { 12, 68 }, { 13, 39 }, { 14, 73 },

  56.     { 15, 53 }, { 16, 69 }, { 17, 57 }, { 19, 88 },

  57.     { 20, 34 }, { 21, 71 }, { 24, 46 }, { 25, 94 },

  58.     { 26, 54 }, { 28, 75 }, { 29, 50 }, { 32, 70 },

  59.     { 33, 92 }, { 35, 74 }, { 38, 85 }, { 40, 56 },

  60.     { 42, 87 }, { 43, 65 }, { 45, 59 }, { 48, 79 },

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

  62.     { 67, 83 }, { 77, 80 }

  63. };

  64. 

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

  66. 

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

  68. {

  69.     int i;

  70.     char *q, r;

  71. 

  72.     q = buf;

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

  74.         r = avio_r8(pb);

  75.         if (i < buf_size - 1)

  76.             *q++ = r;

  77.     }

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

  79. }

  80. 

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

  82. {

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

  84. }

  85. 

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

  87. {

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

  89.         return -1;

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

  91.     if (!avctx->extradata)

  92.         return AVERROR(ENOMEM);

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

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

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

  96.         return AVERROR(EIO);

  97.     return 0;

  98. }

  99. 

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

  101. {

  102.     char buf[1024];

  103.     int i;

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

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

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

  107.         av_metadata_set2(&s->metadata, ff_rm_metadata[i], buf, 0);

  108.     }

  109. }

  110. 

  111. RMStream *ff_rm_alloc_rmstream (void)

  112. {

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

  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, 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->codec_type = AVMEDIA_TYPE_AUDIO;

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

  149.     } else {

  150.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  151.         int codecdata_length;

  152.         /* old version (4) */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  167.         if (version == 5) {

  168.             avio_rb16(pb); avio_rb16(pb); avio_rb16(pb);

  169.         }

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

  171.         avio_rb32(pb);

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

  173.         if (version == 5) {

  174.             avio_rb32(pb);

  175.             avio_read(pb, buf, 4);

  176.             buf[4] = 0;

  177.         } else {

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

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

  180.         }

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

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

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

  184.                                                 st->codec->codec_tag);

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

  186.         case CODEC_ID_AC3:

  187.             st->need_parsing = AVSTREAM_PARSE_FULL;

  188.             break;

  189.         case CODEC_ID_RA_288:

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

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

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

  193. 

  194.             if(ast->audio_framesize >= UINT_MAX / sub_packet_h){

  195.                 av_log(s, AV_LOG_ERROR, "ast->audio_framesize * sub_packet_h too large\n");

  196.                 return -1;

  197.             }

  198. 

  199.             av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h);

  200.             break;

  201.         case CODEC_ID_COOK:

  202.         case CODEC_ID_ATRAC3:

  203.         case CODEC_ID_SIPR:

  204.             avio_rb16(pb); avio_r8(pb);

  205.             if (version == 5)

  206.                 avio_r8(pb);

  207.             codecdata_length = avio_rb32(pb);

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

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

  210.                 return -1;

  211.             }

  212. 

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

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

  215.                 if (flavor > 3) {

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

  217.                            flavor);

  218.                     return -1;

  219.                 }

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

  221.             } else {

  222.                 if(sub_packet_size <= 0){

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

  224.                     return -1;

  225.                 }

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

  227.             }

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

  229.                 return ret;

  230. 

  231.             if(ast->audio_framesize >= UINT_MAX / sub_packet_h){

  232.                 av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");

  233.                 return -1;

  234.             }

  235. 

  236.             av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h);

  237.             break;

  238.         case CODEC_ID_AAC:

  239.             avio_rb16(pb); avio_r8(pb);

  240.             if (version == 5)

  241.                 avio_r8(pb);

  242.             codecdata_length = avio_rb32(pb);

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

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

  245.                 return -1;

  246.             }

  247.             if (codecdata_length >= 1) {

  248.                 avio_r8(pb);

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

  250.                     return ret;

  251.             }

  252.             break;

  253.         default:

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

  255.         }

  256.         if (read_all) {

  257.             avio_r8(pb);

  258.             avio_r8(pb);

  259.             avio_r8(pb);

  260.             rm_read_metadata(s, 0);

  261.         }

  262.     }

  263.     return 0;

  264. }

  265. 

  266. int

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

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

  269. {

  270.     unsigned int v;

  271.     int size;

  272.     int64_t codec_pos;

  273.     int ret;

  274. 

  275.     av_set_pts_info(st, 64, 1, 1000);

  276.     codec_pos = avio_tell(pb);

  277.     v = avio_rb32(pb);

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

  279.         /* ra type header */

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

  281.             return -1;

  282.     } else {

  283.         int fps;

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

  285.         fail1:

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

  287.             goto skip;

  288.         }

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

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

  291.                                                st->codec->codec_tag);

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

  293.         if (st->codec->codec_id == CODEC_ID_NONE)

  294.             goto fail1;

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

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

  297.         st->codec->time_base.num= 1;

  298.         fps= avio_rb16(pb);

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

  300.         avio_rb32(pb);

  301.         avio_skip(pb, 2);

  302.         avio_rb16(pb);

  303. 

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

  305.             return ret;

  306. 

  307. //        av_log(s, AV_LOG_DEBUG, "fps= %d fps2= %d\n", fps, fps2);

  308.         st->codec->time_base.den = fps * st->codec->time_base.num;

  309.         //XXX: do we really need that?

  310.         switch(st->codec->extradata[4]>>4){

  311.         case 1: st->codec->codec_id = CODEC_ID_RV10; break;

  312.         case 2: st->codec->codec_id = CODEC_ID_RV20; break;

  313.         case 3: st->codec->codec_id = CODEC_ID_RV30; break;

  314.         case 4: st->codec->codec_id = CODEC_ID_RV40; break;

  315.         default:

  316.             av_log(st->codec, AV_LOG_ERROR, "extra:%02X %02X %02X %02X %02X\n", st->codec->extradata[0], st->codec->extradata[1], st->codec->extradata[2], st->codec->extradata[3], st->codec->extradata[4]);

  317.             goto fail1;

  318.         }

  319.     }

  320. 

  321. skip:

  322.     /* skip codec info */

  323.     size = avio_tell(pb) - codec_pos;

  324.     avio_skip(pb, codec_data_size - size);

  325. 

  326.     return 0;

  327. }

  328. 

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

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

  331. static int rm_read_index(AVFormatContext *s)

  332. {

  333.     AVIOContext *pb = s->pb;

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

  335.     AVStream *st;

  336. 

  337.     do {

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

  339.             return -1;

  340.         size     = avio_rb32(pb);

  341.         if (size < 20)

  342.             return -1;

  343.         avio_skip(pb, 2);

  344.         n_pkts   = avio_rb32(pb);

  345.         str_id   = avio_rb16(pb);

  346.         next_off = avio_rb32(pb);

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

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

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

  350.                 break;

  351.             }

  352.         if (n == s->nb_streams)

  353.             goto skip;

  354. 

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

  356.             avio_skip(pb, 2);

  357.             pts = avio_rb32(pb);

  358.             pos = avio_rb32(pb);

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

  360. 

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

  362.         }

  363. 

  364. skip:

  365.         if (next_off && avio_tell(pb) != next_off &&

  366.             avio_seek(pb, next_off, SEEK_SET) < 0)

  367.             return -1;

  368.     } while (next_off);

  369. 

  370.     return 0;

  371. }

  372. 

  373. static int rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap)

  374. {

  375.     RMDemuxContext *rm = s->priv_data;

  376.     AVStream *st;

  377. 

  378.     rm->old_format = 1;

  379.     st = av_new_stream(s, 0);

  380.     if (!st)

  381.         return -1;

  382.     st->priv_data = ff_rm_alloc_rmstream();

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

  384. }

  385. 

  386. static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)

  387. {

  388.     RMDemuxContext *rm = s->priv_data;

  389.     AVStream *st;

  390.     AVIOContext *pb = s->pb;

  391.     unsigned int tag;

  392.     int tag_size;

  393.     unsigned int start_time, duration;

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

  395.     char buf[128];

  396.     int flags = 0;

  397. 

  398.     tag = avio_rl32(pb);

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

  400.         /* very old .ra format */

  401.         return rm_read_header_old(s, ap);

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

  403.         return AVERROR(EIO);

  404.     }

  405. 

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

  407.     avio_rb16(pb);

  408.     avio_rb32(pb);

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

  410. 

  411.     for(;;) {

  412.         if (pb->eof_reached)

  413.             return -1;

  414.         tag = avio_rl32(pb);

  415.         tag_size = avio_rb32(pb);

  416.         avio_rb16(pb);

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

  418.                 (tag      ) & 0xff,

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

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

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

  422.                 tag,

  423.                 tag_size);

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

  425.             return -1;

  426.         switch(tag) {

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

  428.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

  440.             break;

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

  442.             rm_read_metadata(s, 1);

  443.             break;

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

  445.             st = av_new_stream(s, 0);

  446.             if (!st)

  447.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  456.             st->start_time = start_time;

  457.             st->duration = duration;

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

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

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

  461.             st->priv_data = ff_rm_alloc_rmstream();

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

  463.                                           avio_rb32(pb)) < 0)

  464.                 return -1;

  465.             break;

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

  467.             goto header_end;

  468.         default:

  469.             /* unknown tag: skip it */

  470.             avio_skip(pb, tag_size - 10);

  471.             break;

  472.         }

  473.     }

  474.  header_end:

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

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

  477.         rm->nb_packets = 3600 * 25;

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

  479. 

  480.     if (!data_off)

  481.         data_off = avio_tell(pb) - 18;

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

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

  484.         rm_read_index(s);

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

  486.     }

  487. 

  488.     return 0;

  489. }

  490. 

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

  492. {

  493.     int n, n1;

  494. 

  495.     n = avio_rb16(pb);

  496.     (*len)-=2;

  497.     n &= 0x7FFF;

  498.     if (n >= 0x4000) {

  499.         return n - 0x4000;

  500.     } else {

  501.         n1 = avio_rb16(pb);

  502.         (*len)-=2;

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

  504.     }

  505. }

  506. 

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

  508. #define RAW_PACKET_SIZE 1000

  509. 

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

  511.     RMDemuxContext *rm = s->priv_data;

  512.     AVIOContext *pb = s->pb;

  513.     AVStream *st;

  514.     uint32_t state=0xFFFFFFFF;

  515. 

  516.     while(!pb->eof_reached){

  517.         int len, num, i;

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

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

  520.             num= rm->current_stream;

  521.             len= rm->remaining_len;

  522.             *timestamp = AV_NOPTS_VALUE;

  523.             *flags= 0;

  524.         }else{

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

  526. 

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

  528.                 int n_pkts, expected_len;

  529.                 len = avio_rb32(pb);

  530.                 avio_skip(pb, 2);

  531.                 n_pkts = avio_rb32(pb);

  532.                 expected_len = 20 + n_pkts * 14;

  533.                 if (len == 20)

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

  535.                     len = expected_len;

  536.                 else if (len != expected_len)

  537.                     av_log(s, AV_LOG_WARNING,

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

  539.                            len, n_pkts, expected_len);

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

  541.                 if(len<0)

  542.                     continue;

  543.                 goto skip;

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

  545.                 av_log(s, AV_LOG_WARNING,

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

  547.             }

  548. 

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

  550.                 continue;

  551.             len=state - 12;

  552.             state= 0xFFFFFFFF;

  553. 

  554.             num = avio_rb16(pb);

  555.             *timestamp = avio_rb32(pb);

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

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

  558.         }

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

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

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

  562.                 break;

  563.         }

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

  565. skip:

  566.             /* skip packet if unknown number */

  567.             avio_skip(pb, len);

  568.             rm->remaining_len = 0;

  569.             continue;

  570.         }

  571.         *stream_index= i;

  572. 

  573.         return len;

  574.     }

  575.     return -1;

  576. }

  577. 

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

  579.                                    RMDemuxContext *rm, RMStream *vst,

  580.                                    AVPacket *pkt, int len, int *pseq)

  581. {

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

  583.     int type;

  584. 

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

  586.     type = hdr >> 6;

  587. 

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

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

  590.     }

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

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

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

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

  595.     }

  596.     if(len<0)

  597.         return -1;

  598.     rm->remaining_len = len;

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

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

  601.             len= len2;

  602.         if(rm->remaining_len < len)

  603.             return -1;

  604.         rm->remaining_len -= len;

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

  606.             return AVERROR(EIO);

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

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

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

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

  611.         return 0;

  612.     }

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

  614. 

  615.     *pseq = seq;

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

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

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

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

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

  621.             return AVERROR(ENOMEM);

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

  623.         vst->cur_slice = 0;

  624.         vst->curpic_num = pic_num;

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

  626.     }

  627.     if(type == 2)

  628.         len = FFMIN(len, pos);

  629. 

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

  631.         return 1;

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

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

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

  635.         return 1;

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

  637.         return AVERROR(EIO);

  638.     vst->videobufpos += len;

  639.     rm->remaining_len-= len;

  640. 

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

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

  643.         *pkt= vst->pkt;

  644.         vst->pkt.data= NULL;

  645.         vst->pkt.size= 0;

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

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

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

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

  650.         pkt->pts = AV_NOPTS_VALUE;

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

  652.         vst->slices = 0;

  653.         return 0;

  654.     }

  655. 

  656.     return 1;

  657. }

  658. 

  659. static inline void

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

  661. {

  662.     uint8_t *ptr;

  663.     int j;

  664. 

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

  666.         ptr = pkt->data;

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

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

  669.             ptr += 2;

  670.         }

  671.     }

  672. }

  673. 

  674. /**

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

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

  677.  */

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

  679. {

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

  681. 

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

  683.         int j;

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

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

  686. 

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

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

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

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

  691. 

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

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

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

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

  696.         }

  697.     }

  698. }

  699. 

  700. int

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

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

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

  704. {

  705.     RMDemuxContext *rm = s->priv_data;

  706. 

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

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

  709.         if(rm_assemble_video_frame(s, pb, rm, ast, pkt, len, seq))

  710.             return -1; //got partial frame

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

  712.         if ((st->codec->codec_id == CODEC_ID_RA_288) ||

  713.             (st->codec->codec_id == CODEC_ID_COOK) ||

  714.             (st->codec->codec_id == CODEC_ID_ATRAC3) ||

  715.             (st->codec->codec_id == CODEC_ID_SIPR)) {

  716.             int x;

  717.             int sps = ast->sub_packet_size;

  718.             int cfs = ast->coded_framesize;

  719.             int h = ast->sub_packet_h;

  720.             int y = ast->sub_packet_cnt;

  721.             int w = ast->audio_framesize;

  722. 

  723.             if (flags & 2)

  724.                 y = ast->sub_packet_cnt = 0;

  725.             if (!y)

  726.                 ast->audiotimestamp = timestamp;

  727. 

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

  729.                 case CODEC_ID_RA_288:

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

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

  732.                     break;

  733.                 case CODEC_ID_ATRAC3:

  734.                 case CODEC_ID_COOK:

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

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

  737.                     break;

  738.                 case CODEC_ID_SIPR:

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

  740.                     break;

  741.             }

  742. 

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

  744.                 return -1;

  745.             if (st->codec->codec_id == CODEC_ID_SIPR)

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

  747. 

  748.              ast->sub_packet_cnt = 0;

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

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

  751.         } else if (st->codec->codec_id == CODEC_ID_AAC) {

  752.             int x;

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

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

  755.             if (ast->sub_packet_cnt) {

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

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

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

  759.                 ast->audiotimestamp = timestamp;

  760.             } else

  761.                 return -1;

  762.         } else {

  763.             av_get_packet(pb, pkt, len);

  764.             rm_ac3_swap_bytes(st, pkt);

  765.         }

  766.     } else

  767.         av_get_packet(pb, pkt, len);

  768. 

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

  770. 

  771. #if 0

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

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

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

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

  776. 

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

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

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

  780.         }

  781.     }

  782. #endif

  783. 

  784.     pkt->pts= timestamp;

  785.     if (flags & 2)

  786.         pkt->flags |= AV_PKT_FLAG_KEY;

  787. 

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

  789. }

  790. 

  791. int

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

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

  794. {

  795.     RMDemuxContext *rm = s->priv_data;

  796. 

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

  798. 

  799.     if (st->codec->codec_id == CODEC_ID_AAC)

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

  801.     else {

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

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

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

  805.                st->codec->block_align);

  806.     }

  807.     rm->audio_pkt_cnt--;

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

  809.         ast->audiotimestamp = AV_NOPTS_VALUE;

  810.         pkt->flags = AV_PKT_FLAG_KEY;

  811.     } else

  812.         pkt->flags = 0;

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

  814. 

  815.     return rm->audio_pkt_cnt;

  816. }

  817. 

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

  819. {

  820.     RMDemuxContext *rm = s->priv_data;

  821.     AVStream *st;

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

  823.     int64_t timestamp, pos;

  824.     int flags;

  825. 

  826.     for (;;) {

  827.         if (rm->audio_pkt_cnt) {

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

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

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

  831.             flags = 0;

  832.         } else {

  833.             if (rm->old_format) {

  834.                 RMStream *ast;

  835. 

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

  837.                 ast = st->priv_data;

  838.                 timestamp = AV_NOPTS_VALUE;

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

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

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

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

  843.             } else {

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

  845.                 if (len > 0)

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

  847.             }

  848. 

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

  850.                 return AVERROR(EIO);

  851. 

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

  853.                                       &seq, flags, timestamp);

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

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

  856.             if (res)

  857.                 continue;

  858.         }

  859. 

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

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

  862.             av_free_packet(pkt);

  863.         } else

  864.             break;

  865.     }

  866. 

  867.     return 0;

  868. }

  869. 

  870. static int rm_read_close(AVFormatContext *s)

  871. {

  872.     int i;

  873. 

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

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

  876. 

  877.     return 0;

  878. }

  879. 

  880. static int rm_probe(AVProbeData *p)

  881. {

  882.     /* check file header */

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

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

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

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

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

  888.         return AVPROBE_SCORE_MAX;

  889.     else

  890.         return 0;

  891. }

  892. 

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

  894.                                int64_t *ppos, int64_t pos_limit)

  895. {

  896.     RMDemuxContext *rm = s->priv_data;

  897.     int64_t pos, dts;

  898.     int stream_index2, flags, len, h;

  899. 

  900.     pos = *ppos;

  901. 

  902.     if(rm->old_format)

  903.         return AV_NOPTS_VALUE;

  904. 

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

  906.     rm->remaining_len=0;

  907.     for(;;){

  908.         int seq=1;

  909.         AVStream *st;

  910. 

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

  912.         if(len<0)

  913.             return AV_NOPTS_VALUE;

  914. 

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

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

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

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

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

  920.             }

  921.         }

  922. 

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

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

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

  926.             if(stream_index2 == stream_index)

  927.                 break;

  928.         }

  929. 

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

  931.     }

  932.     *ppos = pos;

  933.     return dts;

  934. }

  935. 

  936. AVInputFormat ff_rm_demuxer = {

  937.     "rm",

  938.     NULL_IF_CONFIG_SMALL("RealMedia format"),

  939.     sizeof(RMDemuxContext),

  940.     rm_probe,

  941.     rm_read_header,

  942.     rm_read_packet,

  943.     rm_read_close,

  944.     NULL,

  945.     rm_read_dts,

  946. };

  947. 

  948. AVInputFormat ff_rdt_demuxer = {

  949.     "rdt",

  950.     NULL_IF_CONFIG_SMALL("RDT demuxer"),

  951.     sizeof(RMDemuxContext),

  952.     NULL,

  953.     NULL,

  954.     NULL,

  955.     rm_read_close,

  956. };