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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 FFmpeg.

  6.  *

  7.  * FFmpeg 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.  * FFmpeg 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 FFmpeg; 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 = AV_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 AV_CODEC_ID_AC3:

  200.             st->need_parsing = AVSTREAM_PARSE_FULL;

  201.             break;

  202.         case AV_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 AV_CODEC_ID_COOK:

  208.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  209.         case AV_CODEC_ID_ATRAC3:

  210.         case AV_CODEC_ID_SIPR:

  211.             avio_rb16(pb); avio_r8(pb);

  212.             if (version == 5)

  213.                 avio_r8(pb);

  214.             codecdata_length = avio_rb32(pb);

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

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

  217.                 return -1;

  218.             }

  219. 

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

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

  222.                 if (flavor > 3) {

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

  224.                            flavor);

  225.                     return -1;

  226.                 }

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

  228.             } else {

  229.                 if(sub_packet_size <= 0){

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

  231.                     return -1;

  232.                 }

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

  234.             }

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

  236.                 return ret;

  237. 

  238.             break;

  239.         case AV_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 (ast->deint_id == DEINT_ID_INT4 ||

  258.             ast->deint_id == DEINT_ID_GENR ||

  259.             ast->deint_id == DEINT_ID_SIPR) {

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

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

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

  263.                 return AVERROR_INVALIDDATA;

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

  265.                 return AVERROR(ENOMEM);

  266.         }

  267.         switch (ast->deint_id) {

  268.         case DEINT_ID_INT4:

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

  270.                 sub_packet_h <= 1 ||

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

  272.                 return AVERROR_INVALIDDATA;

  273.             break;

  274.         case DEINT_ID_GENR:

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

  276.                 ast->sub_packet_size > ast->audio_framesize)

  277.                 return AVERROR_INVALIDDATA;

  278.             break;

  279.         case DEINT_ID_SIPR:

  280.         case DEINT_ID_INT0:

  281.         case DEINT_ID_VBRS:

  282.         case DEINT_ID_VBRF:

  283.             break;

  284.         default:

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

  286.             return AVERROR_INVALIDDATA;

  287.         }

  288. 

  289.         if (read_all) {

  290.             avio_r8(pb);

  291.             avio_r8(pb);

  292.             avio_r8(pb);

  293.             rm_read_metadata(s, 0);

  294.         }

  295.     }

  296.     return 0;

  297. }

  298. 

  299. int

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

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

  302. {

  303.     unsigned int v;

  304.     int size;

  305.     int64_t codec_pos;

  306.     int ret;

  307. 

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

  309.     codec_pos = avio_tell(pb);

  310.     v = avio_rb32(pb);

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

  312.         /* ra type header */

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

  314.             return -1;

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

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

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

  318.             return ret;

  319. 

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

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

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

  323.                                                 st->codec->codec_tag);

  324.     } else {

  325.         int fps;

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

  327.         fail1:

  328.             av_log(s, AV_LOG_WARNING, "Unsupported stream type %08x\n", v);

  329.             goto skip;

  330.         }

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

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

  333.                                                st->codec->codec_tag);

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

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

  336.             goto fail1;

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

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

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

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

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

  342.         st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  343.         fps = avio_rb32(pb);

  344. 

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

  346.             return ret;

  347. 

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

  349.                   0x10000, fps, (1 << 30) - 1);

  350. #if FF_API_R_FRAME_RATE

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

  352. #endif

  353.     }

  354. 

  355. skip:

  356.     /* skip codec info */

  357.     size = avio_tell(pb) - codec_pos;

  358.     avio_skip(pb, codec_data_size - size);

  359. 

  360.     return 0;

  361. }

  362. 

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

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

  365. static int rm_read_index(AVFormatContext *s)

  366. {

  367.     AVIOContext *pb = s->pb;

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

  369.     AVStream *st;

  370. 

  371.     do {

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

  373.             return -1;

  374.         size     = avio_rb32(pb);

  375.         if (size < 20)

  376.             return -1;

  377.         avio_skip(pb, 2);

  378.         n_pkts   = avio_rb32(pb);

  379.         str_id   = avio_rb16(pb);

  380.         next_off = avio_rb32(pb);

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

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

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

  384.                 break;

  385.             }

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

  387.             av_log(s, AV_LOG_ERROR,

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

  389.                    str_id, avio_tell(pb));

  390.             goto skip;

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

  392.             av_log(s, AV_LOG_ERROR,

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

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

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

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

  397.             goto skip;

  398.         }

  399. 

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

  401.             avio_skip(pb, 2);

  402.             pts = avio_rb32(pb);

  403.             pos = avio_rb32(pb);

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

  405. 

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

  407.         }

  408. 

  409. skip:

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

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

  412.             av_log(s, AV_LOG_ERROR,

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

  414.             return -1;

  415.         }

  416.     } while (next_off);

  417. 

  418.     return 0;

  419. }

  420. 

  421. static int rm_read_header_old(AVFormatContext *s)

  422. {

  423.     RMDemuxContext *rm = s->priv_data;

  424.     AVStream *st;

  425. 

  426.     rm->old_format = 1;

  427.     st = avformat_new_stream(s, NULL);

  428.     if (!st)

  429.         return -1;

  430.     st->priv_data = ff_rm_alloc_rmstream();

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

  432. }

  433. 

  434. static int rm_read_header(AVFormatContext *s)

  435. {

  436.     RMDemuxContext *rm = s->priv_data;

  437.     AVStream *st;

  438.     AVIOContext *pb = s->pb;

  439.     unsigned int tag;

  440.     int tag_size;

  441.     unsigned int start_time, duration;

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

  443.     char buf[128];

  444.     int flags = 0;

  445. 

  446.     tag = avio_rl32(pb);

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

  448.         /* very old .ra format */

  449.         return rm_read_header_old(s);

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

  451.         return AVERROR(EIO);

  452.     }

  453. 

  454.     tag_size = avio_rb32(pb);

  455.     avio_skip(pb, tag_size - 8);

  456. 

  457.     for(;;) {

  458.         if (url_feof(pb))

  459.             return -1;

  460.         tag = avio_rl32(pb);

  461.         tag_size = avio_rb32(pb);

  462.         avio_rb16(pb);

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

  464.                 (tag      ) & 0xff,

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

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

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

  468.                 tag,

  469.                 tag_size);

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

  471.             return -1;

  472.         switch(tag) {

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

  474.             /* file header */

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

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

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

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

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

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

  481.             s->duration = av_rescale(duration, AV_TIME_BASE, 1000);

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

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

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

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

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

  487.             break;

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

  489.             rm_read_metadata(s, 1);

  490.             break;

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

  492.             st = avformat_new_stream(s, NULL);

  493.             if (!st)

  494.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  503.             st->start_time = start_time;

  504.             st->duration = duration;

  505.             if(duration>0)

  506.                 s->duration = AV_NOPTS_VALUE;

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

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

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

  510.             st->priv_data = ff_rm_alloc_rmstream();

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

  512.                                           avio_rb32(pb)) < 0)

  513.                 return -1;

  514.             break;

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

  516.             goto header_end;

  517.         default:

  518.             /* unknown tag: skip it */

  519.             avio_skip(pb, tag_size - 10);

  520.             break;

  521.         }

  522.     }

  523.  header_end:

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

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

  526.         rm->nb_packets = 3600 * 25;

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

  528. 

  529.     if (!data_off)

  530.         data_off = avio_tell(pb) - 18;

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

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

  533.         rm_read_index(s);

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

  535.     }

  536. 

  537.     return 0;

  538. }

  539. 

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

  541. {

  542.     int n, n1;

  543. 

  544.     n = avio_rb16(pb);

  545.     (*len)-=2;

  546.     n &= 0x7FFF;

  547.     if (n >= 0x4000) {

  548.         return n - 0x4000;

  549.     } else {

  550.         n1 = avio_rb16(pb);

  551.         (*len)-=2;

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

  553.     }

  554. }

  555. 

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

  557. #define RAW_PACKET_SIZE 1000

  558. 

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

  560.     RMDemuxContext *rm = s->priv_data;

  561.     AVIOContext *pb = s->pb;

  562.     AVStream *st;

  563.     uint32_t state=0xFFFFFFFF;

  564. 

  565.     while(!url_feof(pb)){

  566.         int len, num, i;

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

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

  569.             num= rm->current_stream;

  570.             len= rm->remaining_len;

  571.             *timestamp = AV_NOPTS_VALUE;

  572.             *flags= 0;

  573.         }else{

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

  575. 

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

  577.                 int n_pkts, expected_len;

  578.                 len = avio_rb32(pb);

  579.                 avio_skip(pb, 2);

  580.                 n_pkts = avio_rb32(pb);

  581.                 expected_len = 20 + n_pkts * 14;

  582.                 if (len == 20)

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

  584.                     len = expected_len;

  585.                 else if (len != expected_len)

  586.                     av_log(s, AV_LOG_WARNING,

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

  588.                            len, n_pkts, expected_len);

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

  590.                 if(len<0)

  591.                     continue;

  592.                 goto skip;

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

  594.                 av_log(s, AV_LOG_WARNING,

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

  596.             }

  597. 

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

  599.                 continue;

  600.             len=state - 12;

  601.             state= 0xFFFFFFFF;

  602. 

  603.             num = avio_rb16(pb);

  604.             *timestamp = avio_rb32(pb);

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

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

  607.         }

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

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

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

  611.                 break;

  612.         }

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

  614. skip:

  615.             /* skip packet if unknown number */

  616.             avio_skip(pb, len);

  617.             rm->remaining_len = 0;

  618.             continue;

  619.         }

  620.         *stream_index= i;

  621. 

  622.         return len;

  623.     }

  624.     return -1;

  625. }

  626. 

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

  628.                                    RMDemuxContext *rm, RMStream *vst,

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

  630.                                    int64_t *timestamp)

  631. {

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

  633.     int type;

  634. 

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

  636.     type = hdr >> 6;

  637. 

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

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

  640.     }

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

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

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

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

  645.     }

  646.     if(len<0)

  647.         return -1;

  648.     rm->remaining_len = len;

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

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

  651.             len= len2;

  652.             *timestamp = pos;

  653.         }

  654.         if(rm->remaining_len < len)

  655.             return -1;

  656.         rm->remaining_len -= len;

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

  658.             return AVERROR(EIO);

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

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

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

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

  663.         return 0;

  664.     }

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

  666. 

  667.     *pseq = seq;

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

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

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

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

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

  673.             return AVERROR(ENOMEM);

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

  675.         vst->cur_slice = 0;

  676.         vst->curpic_num = pic_num;

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

  678.     }

  679.     if(type == 2)

  680.         len = FFMIN(len, pos);

  681. 

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

  683.         return 1;

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

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

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

  687.         return 1;

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

  689.         return AVERROR(EIO);

  690.     vst->videobufpos += len;

  691.     rm->remaining_len-= len;

  692. 

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

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

  695.         *pkt= vst->pkt;

  696.         vst->pkt.data= NULL;

  697.         vst->pkt.size= 0;

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

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

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

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

  702.         pkt->pts = AV_NOPTS_VALUE;

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

  704.         vst->slices = 0;

  705.         return 0;

  706.     }

  707. 

  708.     return 1;

  709. }

  710. 

  711. static inline void

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

  713. {

  714.     uint8_t *ptr;

  715.     int j;

  716. 

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

  718.         ptr = pkt->data;

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

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

  721.             ptr += 2;

  722.         }

  723.     }

  724. }

  725. 

  726. /**

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

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

  729.  */

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

  731. {

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

  733. 

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

  735.         int j;

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

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

  738. 

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

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

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

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

  743. 

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

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

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

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

  748.         }

  749.     }

  750. }

  751. 

  752. int

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

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

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

  756. {

  757.     RMDemuxContext *rm = s->priv_data;

  758. 

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

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

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

  762.             return -1; //got partial frame

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

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

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

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

  767.             int x;

  768.             int sps = ast->sub_packet_size;

  769.             int cfs = ast->coded_framesize;

  770.             int h = ast->sub_packet_h;

  771.             int y = ast->sub_packet_cnt;

  772.             int w = ast->audio_framesize;

  773. 

  774.             if (flags & 2)

  775.                 y = ast->sub_packet_cnt = 0;

  776.             if (!y)

  777.                 ast->audiotimestamp = timestamp;

  778. 

  779.             switch (ast->deint_id) {

  780.                 case DEINT_ID_INT4:

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

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

  783.                     break;

  784.                 case DEINT_ID_GENR:

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

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

  787.                     break;

  788.                 case DEINT_ID_SIPR:

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

  790.                     break;

  791.             }

  792. 

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

  794.                 return -1;

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

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

  797. 

  798.              ast->sub_packet_cnt = 0;

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

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

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

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

  803.             int x;

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

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

  806.             if (ast->sub_packet_cnt) {

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

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

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

  810.                 ast->audiotimestamp = timestamp;

  811.             } else

  812.                 return -1;

  813.         } else {

  814.             av_get_packet(pb, pkt, len);

  815.             rm_ac3_swap_bytes(st, pkt);

  816.         }

  817.     } else

  818.         av_get_packet(pb, pkt, len);

  819. 

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

  821. 

  822. #if 0

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

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

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

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

  827. 

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

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

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

  831.         }

  832.     }

  833. #endif

  834. 

  835.     pkt->pts = timestamp;

  836.     if (flags & 2)

  837.         pkt->flags |= AV_PKT_FLAG_KEY;

  838. 

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

  840. }

  841. 

  842. int

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

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

  845. {

  846.     RMDemuxContext *rm = s->priv_data;

  847. 

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

  849. 

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

  851.         ast->deint_id == DEINT_ID_VBRS)

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

  853.     else {

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

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

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

  857.                st->codec->block_align);

  858.     }

  859.     rm->audio_pkt_cnt--;

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

  861.         ast->audiotimestamp = AV_NOPTS_VALUE;

  862.         pkt->flags = AV_PKT_FLAG_KEY;

  863.     } else

  864.         pkt->flags = 0;

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

  866. 

  867.     return rm->audio_pkt_cnt;

  868. }

  869. 

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

  871. {

  872.     RMDemuxContext *rm = s->priv_data;

  873.     AVStream *st;

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

  875.     int64_t timestamp, pos;

  876.     int flags;

  877. 

  878.     for (;;) {

  879.         if (rm->audio_pkt_cnt) {

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

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

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

  883.             flags = 0;

  884.         } else {

  885.             if (rm->old_format) {

  886.                 RMStream *ast;

  887. 

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

  889.                 ast = st->priv_data;

  890.                 timestamp = AV_NOPTS_VALUE;

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

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

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

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

  895.             } else {

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

  897.                 if (len > 0)

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

  899.             }

  900. 

  901.             if(len<0 || url_feof(s->pb))

  902.                 return AVERROR(EIO);

  903. 

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

  905.                                       &seq, flags, timestamp);

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

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

  908.             if (res)

  909.                 continue;

  910.         }

  911. 

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

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

  914.             av_free_packet(pkt);

  915.         } else

  916.             break;

  917.     }

  918. 

  919.     return 0;

  920. }

  921. 

  922. static int rm_read_close(AVFormatContext *s)

  923. {

  924.     int i;

  925. 

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

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

  928. 

  929.     return 0;

  930. }

  931. 

  932. static int rm_probe(AVProbeData *p)

  933. {

  934.     /* check file header */

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

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

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

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

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

  940.         return AVPROBE_SCORE_MAX;

  941.     else

  942.         return 0;

  943. }

  944. 

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

  946.                                int64_t *ppos, int64_t pos_limit)

  947. {

  948.     RMDemuxContext *rm = s->priv_data;

  949.     int64_t pos, dts;

  950.     int stream_index2, flags, len, h;

  951. 

  952.     pos = *ppos;

  953. 

  954.     if(rm->old_format)

  955.         return AV_NOPTS_VALUE;

  956. 

  957.     if (avio_seek(s->pb, pos, SEEK_SET) < 0)

  958.         return AV_NOPTS_VALUE;

  959. 

  960.     rm->remaining_len=0;

  961.     for(;;){

  962.         int seq=1;

  963.         AVStream *st;

  964. 

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

  966.         if(len<0)

  967.             return AV_NOPTS_VALUE;

  968. 

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

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

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

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

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

  974.             }

  975.         }

  976. 

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

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

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

  980.             if(stream_index2 == stream_index)

  981.                 break;

  982.         }

  983. 

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

  985.     }

  986.     *ppos = pos;

  987.     return dts;

  988. }

  989. 

  990. AVInputFormat ff_rm_demuxer = {

  991.     .name           = "rm",

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

  993.     .priv_data_size = sizeof(RMDemuxContext),

  994.     .read_probe     = rm_probe,

  995.     .read_header    = rm_read_header,

  996.     .read_packet    = rm_read_packet,

  997.     .read_close     = rm_read_close,

  998.     .read_timestamp = rm_read_dts,

  999. };

  1000. 

  1001. AVInputFormat ff_rdt_demuxer = {

  1002.     .name           = "rdt",

  1003.     .long_name      = NULL_IF_CONFIG_SMALL("RDT demuxer"),

  1004.     .priv_data_size = sizeof(RMDemuxContext),

  1005.     .read_close     = rm_read_close,

  1006.     .flags          = AVFMT_NOFILE,

  1007. };