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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 "riff.h"

  27. #include "rm.h"

  28. 

  29. struct RMStream {

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

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

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

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

  34.     int cur_slice, slices;

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

  36.     /// Audio descrambling matrix parameters

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

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

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

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

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

  42. };

  43. 

  44. typedef struct {

  45.     int nb_packets;

  46.     int old_format;

  47.     int current_stream;

  48.     int remaining_len;

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

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

  51. } RMDemuxContext;

  52. 

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

  54.     {  0, 63 }, {  1, 22 }, {  2, 44 }, {  3, 90 },

  55.     {  5, 81 }, {  7, 31 }, {  8, 86 }, {  9, 58 },

  56.     { 10, 36 }, { 12, 68 }, { 13, 39 }, { 14, 73 },

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

  58.     { 20, 34 }, { 21, 71 }, { 24, 46 }, { 25, 94 },

  59.     { 26, 54 }, { 28, 75 }, { 29, 50 }, { 32, 70 },

  60.     { 33, 92 }, { 35, 74 }, { 38, 85 }, { 40, 56 },

  61.     { 42, 87 }, { 43, 65 }, { 45, 59 }, { 48, 79 },

  62.     { 49, 93 }, { 51, 89 }, { 55, 95 }, { 61, 76 },

  63.     { 67, 83 }, { 77, 80 }

  64. };

  65. 

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

  67. 

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

  69. {

  70.     int i;

  71.     char *q, r;

  72. 

  73.     q = buf;

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

  75.         r = avio_r8(pb);

  76.         if (i < buf_size - 1)

  77.             *q++ = r;

  78.     }

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

  80. }

  81. 

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

  83. {

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

  85. }

  86. 

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

  88. {

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

  90.         return -1;

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

  92.     if (!avctx->extradata)

  93.         return AVERROR(ENOMEM);

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

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

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

  97.         return AVERROR(EIO);

  98.     return 0;

  99. }

  100. 

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

  102. {

  103.     char buf[1024];

  104.     int i;

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

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

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

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

  109.     }

  110. }

  111. 

  112. RMStream *ff_rm_alloc_rmstream (void)

  113. {

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

  115.     rms->curpic_num = -1;

  116.     return rms;

  117. }

  118. 

  119. void ff_rm_free_rmstream (RMStream *rms)

  120. {

  121.     av_free_packet(&rms->pkt);

  122. }

  123. 

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

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

  126. {

  127.     char buf[256];

  128.     uint32_t version;

  129.     int ret;

  130. 

  131.     /* ra type header */

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

  133.     if (version == 3) {

  134.         int header_size = avio_rb16(pb);

  135.         int64_t startpos = avio_tell(pb);

  136.         avio_skip(pb, 14);

  137.         rm_read_metadata(s, 0);

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

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

  140.             avio_r8(pb);

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

  142.         }

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

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

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

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

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

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

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

  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.             avio_rb32(pb);

  176.             avio_read(pb, buf, 4);

  177.             buf[4] = 0;

  178.         } else {

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

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

  181.         }

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

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

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

  185.                                                 st->codec->codec_tag);

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

  187.         case CODEC_ID_AC3:

  188.             st->need_parsing = AVSTREAM_PARSE_FULL;

  189.             break;

  190.         case CODEC_ID_RA_288:

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

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

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

  194. 

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

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

  197.                 return -1;

  198.             }

  199. 

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

  201.             break;

  202.         case CODEC_ID_COOK:

  203.         case CODEC_ID_ATRAC3:

  204.         case CODEC_ID_SIPR:

  205.             avio_rb16(pb); avio_r8(pb);

  206.             if (version == 5)

  207.                 avio_r8(pb);

  208.             codecdata_length = avio_rb32(pb);

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

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

  211.                 return -1;

  212.             }

  213. 

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

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

  216.                 if (flavor > 3) {

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

  218.                            flavor);

  219.                     return -1;

  220.                 }

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

  222.             } else {

  223.                 if(sub_packet_size <= 0){

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

  225.                     return -1;

  226.                 }

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

  228.             }

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

  230.                 return ret;

  231. 

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

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

  234.                 return -1;

  235.             }

  236. 

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

  238.             break;

  239.         case CODEC_ID_AAC:

  240.             avio_rb16(pb); avio_r8(pb);

  241.             if (version == 5)

  242.                 avio_r8(pb);

  243.             codecdata_length = avio_rb32(pb);

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

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

  246.                 return -1;

  247.             }

  248.             if (codecdata_length >= 1) {

  249.                 avio_r8(pb);

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

  251.                     return ret;

  252.             }

  253.             break;

  254.         default:

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

  256.         }

  257.         if (read_all) {

  258.             avio_r8(pb);

  259.             avio_r8(pb);

  260.             avio_r8(pb);

  261.             rm_read_metadata(s, 0);

  262.         }

  263.     }

  264.     return 0;

  265. }

  266. 

  267. int

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

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

  270. {

  271.     unsigned int v;

  272.     int size;

  273.     int64_t codec_pos;

  274.     int ret;

  275. 

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

  277.     codec_pos = avio_tell(pb);

  278.     v = avio_rb32(pb);

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

  280.         /* ra type header */

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

  282.             return -1;

  283.     } else {

  284.         int fps;

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

  286.         fail1:

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

  288.             goto skip;

  289.         }

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

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

  292.                                                st->codec->codec_tag);

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

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

  295.             goto fail1;

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

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

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

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

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

  301.         st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  302.         fps = avio_rb32(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_reduce(&st->codec->time_base.num, &st->codec->time_base.den,

  308.                   0x10000, fps, (1 << 30) - 1);

  309.         st->avg_frame_rate.num = st->codec->time_base.den;

  310.         st->avg_frame_rate.den = st->codec->time_base.num;

  311.     }

  312. 

  313. skip:

  314.     /* skip codec info */

  315.     size = avio_tell(pb) - codec_pos;

  316.     avio_skip(pb, codec_data_size - size);

  317. 

  318.     return 0;

  319. }

  320. 

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

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

  323. static int rm_read_index(AVFormatContext *s)

  324. {

  325.     AVIOContext *pb = s->pb;

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

  327.     AVStream *st;

  328. 

  329.     do {

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

  331.             return -1;

  332.         size     = avio_rb32(pb);

  333.         if (size < 20)

  334.             return -1;

  335.         avio_skip(pb, 2);

  336.         n_pkts   = avio_rb32(pb);

  337.         str_id   = avio_rb16(pb);

  338.         next_off = avio_rb32(pb);

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

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

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

  342.                 break;

  343.             }

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

  345.             goto skip;

  346. 

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

  348.             avio_skip(pb, 2);

  349.             pts = avio_rb32(pb);

  350.             pos = avio_rb32(pb);

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

  352. 

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

  354.         }

  355. 

  356. skip:

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

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

  359.             return -1;

  360.     } while (next_off);

  361. 

  362.     return 0;

  363. }

  364. 

  365. static int rm_read_header_old(AVFormatContext *s)

  366. {

  367.     RMDemuxContext *rm = s->priv_data;

  368.     AVStream *st;

  369. 

  370.     rm->old_format = 1;

  371.     st = av_new_stream(s, 0);

  372.     if (!st)

  373.         return -1;

  374.     st->priv_data = ff_rm_alloc_rmstream();

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

  376. }

  377. 

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

  379. {

  380.     RMDemuxContext *rm = s->priv_data;

  381.     AVStream *st;

  382.     AVIOContext *pb = s->pb;

  383.     unsigned int tag;

  384.     int tag_size;

  385.     unsigned int start_time, duration;

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

  387.     char buf[128];

  388.     int flags = 0;

  389. 

  390.     tag = avio_rl32(pb);

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

  392.         /* very old .ra format */

  393.         return rm_read_header_old(s);

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

  395.         return AVERROR(EIO);

  396.     }

  397. 

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

  399.     avio_rb16(pb);

  400.     avio_rb32(pb);

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

  402. 

  403.     for(;;) {

  404.         if (pb->eof_reached)

  405.             return -1;

  406.         tag = avio_rl32(pb);

  407.         tag_size = avio_rb32(pb);

  408.         avio_rb16(pb);

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

  410.                 (tag      ) & 0xff,

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

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

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

  414.                 tag,

  415.                 tag_size);

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

  417.             return -1;

  418.         switch(tag) {

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

  420.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

  432.             break;

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

  434.             rm_read_metadata(s, 1);

  435.             break;

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

  437.             st = av_new_stream(s, 0);

  438.             if (!st)

  439.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  448.             st->start_time = start_time;

  449.             st->duration = duration;

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

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

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

  453.             st->priv_data = ff_rm_alloc_rmstream();

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

  455.                                           avio_rb32(pb)) < 0)

  456.                 return -1;

  457.             break;

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

  459.             goto header_end;

  460.         default:

  461.             /* unknown tag: skip it */

  462.             avio_skip(pb, tag_size - 10);

  463.             break;

  464.         }

  465.     }

  466.  header_end:

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

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

  469.         rm->nb_packets = 3600 * 25;

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

  471. 

  472.     if (!data_off)

  473.         data_off = avio_tell(pb) - 18;

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

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

  476.         rm_read_index(s);

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

  478.     }

  479. 

  480.     return 0;

  481. }

  482. 

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

  484. {

  485.     int n, n1;

  486. 

  487.     n = avio_rb16(pb);

  488.     (*len)-=2;

  489.     n &= 0x7FFF;

  490.     if (n >= 0x4000) {

  491.         return n - 0x4000;

  492.     } else {

  493.         n1 = avio_rb16(pb);

  494.         (*len)-=2;

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

  496.     }

  497. }

  498. 

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

  500. #define RAW_PACKET_SIZE 1000

  501. 

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

  503.     RMDemuxContext *rm = s->priv_data;

  504.     AVIOContext *pb = s->pb;

  505.     AVStream *st;

  506.     uint32_t state=0xFFFFFFFF;

  507. 

  508.     while(!pb->eof_reached){

  509.         int len, num, i;

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

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

  512.             num= rm->current_stream;

  513.             len= rm->remaining_len;

  514.             *timestamp = AV_NOPTS_VALUE;

  515.             *flags= 0;

  516.         }else{

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

  518. 

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

  520.                 int n_pkts, expected_len;

  521.                 len = avio_rb32(pb);

  522.                 avio_skip(pb, 2);

  523.                 n_pkts = avio_rb32(pb);

  524.                 expected_len = 20 + n_pkts * 14;

  525.                 if (len == 20)

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

  527.                     len = expected_len;

  528.                 else if (len != expected_len)

  529.                     av_log(s, AV_LOG_WARNING,

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

  531.                            len, n_pkts, expected_len);

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

  533.                 if(len<0)

  534.                     continue;

  535.                 goto skip;

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

  537.                 av_log(s, AV_LOG_WARNING,

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

  539.             }

  540. 

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

  542.                 continue;

  543.             len=state - 12;

  544.             state= 0xFFFFFFFF;

  545. 

  546.             num = avio_rb16(pb);

  547.             *timestamp = avio_rb32(pb);

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

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

  550.         }

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

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

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

  554.                 break;

  555.         }

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

  557. skip:

  558.             /* skip packet if unknown number */

  559.             avio_skip(pb, len);

  560.             rm->remaining_len = 0;

  561.             continue;

  562.         }

  563.         *stream_index= i;

  564. 

  565.         return len;

  566.     }

  567.     return -1;

  568. }

  569. 

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

  571.                                    RMDemuxContext *rm, RMStream *vst,

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

  573.                                    int64_t *timestamp)

  574. {

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

  576.     int type;

  577. 

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

  579.     type = hdr >> 6;

  580. 

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

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

  583.     }

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

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

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

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

  588.     }

  589.     if(len<0)

  590.         return -1;

  591.     rm->remaining_len = len;

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

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

  594.             len= len2;

  595.             *timestamp = pos;

  596.         }

  597.         if(rm->remaining_len < len)

  598.             return -1;

  599.         rm->remaining_len -= len;

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

  601.             return AVERROR(EIO);

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

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

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

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

  606.         return 0;

  607.     }

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

  609. 

  610.     *pseq = seq;

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

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

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

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

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

  616.             return AVERROR(ENOMEM);

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

  618.         vst->cur_slice = 0;

  619.         vst->curpic_num = pic_num;

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

  621.     }

  622.     if(type == 2)

  623.         len = FFMIN(len, pos);

  624. 

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

  626.         return 1;

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

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

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

  630.         return 1;

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

  632.         return AVERROR(EIO);

  633.     vst->videobufpos += len;

  634.     rm->remaining_len-= len;

  635. 

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

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

  638.         *pkt= vst->pkt;

  639.         vst->pkt.data= NULL;

  640.         vst->pkt.size= 0;

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

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

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

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

  645.         pkt->pts = AV_NOPTS_VALUE;

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

  647.         vst->slices = 0;

  648.         return 0;

  649.     }

  650. 

  651.     return 1;

  652. }

  653. 

  654. static inline void

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

  656. {

  657.     uint8_t *ptr;

  658.     int j;

  659. 

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

  661.         ptr = pkt->data;

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

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

  664.             ptr += 2;

  665.         }

  666.     }

  667. }

  668. 

  669. /**

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

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

  672.  */

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

  674. {

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

  676. 

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

  678.         int j;

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

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

  681. 

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

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

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

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

  686. 

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

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

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

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

  691.         }

  692.     }

  693. }

  694. 

  695. int

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

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

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

  699. {

  700.     RMDemuxContext *rm = s->priv_data;

  701. 

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

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

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

  705.             return -1; //got partial frame

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

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

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

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

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

  711.             int x;

  712.             int sps = ast->sub_packet_size;

  713.             int cfs = ast->coded_framesize;

  714.             int h = ast->sub_packet_h;

  715.             int y = ast->sub_packet_cnt;

  716.             int w = ast->audio_framesize;

  717. 

  718.             if (flags & 2)

  719.                 y = ast->sub_packet_cnt = 0;

  720.             if (!y)

  721.                 ast->audiotimestamp = timestamp;

  722. 

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

  724.                 case CODEC_ID_RA_288:

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

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

  727.                     break;

  728.                 case CODEC_ID_ATRAC3:

  729.                 case CODEC_ID_COOK:

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

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

  732.                     break;

  733.                 case CODEC_ID_SIPR:

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

  735.                     break;

  736.             }

  737. 

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

  739.                 return -1;

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

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

  742. 

  743.              ast->sub_packet_cnt = 0;

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

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

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

  747.             int x;

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

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

  750.             if (ast->sub_packet_cnt) {

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

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

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

  754.                 ast->audiotimestamp = timestamp;

  755.             } else

  756.                 return -1;

  757.         } else {

  758.             av_get_packet(pb, pkt, len);

  759.             rm_ac3_swap_bytes(st, pkt);

  760.         }

  761.     } else

  762.         av_get_packet(pb, pkt, len);

  763. 

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

  765. 

  766. #if 0

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

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

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

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

  771. 

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

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

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

  775.         }

  776.     }

  777. #endif

  778. 

  779.     pkt->pts = timestamp;

  780.     if (flags & 2)

  781.         pkt->flags |= AV_PKT_FLAG_KEY;

  782. 

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

  784. }

  785. 

  786. int

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

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

  789. {

  790.     RMDemuxContext *rm = s->priv_data;

  791. 

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

  793. 

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

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

  796.     else {

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

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

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

  800.                st->codec->block_align);

  801.     }

  802.     rm->audio_pkt_cnt--;

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

  804.         ast->audiotimestamp = AV_NOPTS_VALUE;

  805.         pkt->flags = AV_PKT_FLAG_KEY;

  806.     } else

  807.         pkt->flags = 0;

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

  809. 

  810.     return rm->audio_pkt_cnt;

  811. }

  812. 

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

  814. {

  815.     RMDemuxContext *rm = s->priv_data;

  816.     AVStream *st;

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

  818.     int64_t timestamp, pos;

  819.     int flags;

  820. 

  821.     for (;;) {

  822.         if (rm->audio_pkt_cnt) {

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

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

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

  826.             flags = 0;

  827.         } else {

  828.             if (rm->old_format) {

  829.                 RMStream *ast;

  830. 

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

  832.                 ast = st->priv_data;

  833.                 timestamp = AV_NOPTS_VALUE;

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

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

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

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

  838.             } else {

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

  840.                 if (len > 0)

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

  842.             }

  843. 

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

  845.                 return AVERROR(EIO);

  846. 

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

  848.                                       &seq, flags, timestamp);

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

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

  851.             if (res)

  852.                 continue;

  853.         }

  854. 

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

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

  857.             av_free_packet(pkt);

  858.         } else

  859.             break;

  860.     }

  861. 

  862.     return 0;

  863. }

  864. 

  865. static int rm_read_close(AVFormatContext *s)

  866. {

  867.     int i;

  868. 

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

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

  871. 

  872.     return 0;

  873. }

  874. 

  875. static int rm_probe(AVProbeData *p)

  876. {

  877.     /* check file header */

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

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

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

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

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

  883.         return AVPROBE_SCORE_MAX;

  884.     else

  885.         return 0;

  886. }

  887. 

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

  889.                                int64_t *ppos, int64_t pos_limit)

  890. {

  891.     RMDemuxContext *rm = s->priv_data;

  892.     int64_t pos, dts;

  893.     int stream_index2, flags, len, h;

  894. 

  895.     pos = *ppos;

  896. 

  897.     if(rm->old_format)

  898.         return AV_NOPTS_VALUE;

  899. 

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

  901.     rm->remaining_len=0;

  902.     for(;;){

  903.         int seq=1;

  904.         AVStream *st;

  905. 

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

  907.         if(len<0)

  908.             return AV_NOPTS_VALUE;

  909. 

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

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

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

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

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

  915.             }

  916.         }

  917. 

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

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

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

  921.             if(stream_index2 == stream_index)

  922.                 break;

  923.         }

  924. 

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

  926.     }

  927.     *ppos = pos;

  928.     return dts;

  929. }

  930. 

  931. AVInputFormat ff_rm_demuxer = {

  932.     .name           = "rm",

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

  934.     .priv_data_size = sizeof(RMDemuxContext),

  935.     .read_probe     = rm_probe,

  936.     .read_header    = rm_read_header,

  937.     .read_packet    = rm_read_packet,

  938.     .read_close     = rm_read_close,

  939.     .read_timestamp = rm_read_dts,

  940. };

  941. 

  942. AVInputFormat ff_rdt_demuxer = {

  943.     .name           = "rdt",

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

  945.     .priv_data_size = sizeof(RMDemuxContext),

  946.     .read_close     = rm_read_close,

  947. };