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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/avassert.h"

  23. #include "libavutil/avstring.h"

  24. #include "libavutil/channel_layout.h"

  25. #include "libavutil/intreadwrite.h"

  26. #include "libavutil/dict.h"

  27. #include "avformat.h"

  28. #include "internal.h"

  29. #include "rmsipr.h"

  30. #include "rm.h"

  31. 

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

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

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

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

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

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

  38. 

  39. struct RMStream {

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

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

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

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

  44.     int cur_slice, slices;

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

  46.     /// Audio descrambling matrix parameters

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

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

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

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

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

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

  53. };

  54. 

  55. typedef struct {

  56.     int nb_packets;

  57.     int old_format;

  58.     int current_stream;

  59.     int remaining_len;

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

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

  62. } RMDemuxContext;

  63. 

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

  65. {

  66.     int i;

  67.     char *q, r;

  68. 

  69.     q = buf;

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

  71.         r = avio_r8(pb);

  72.         if (i < buf_size - 1)

  73.             *q++ = r;

  74.     }

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

  76. }

  77. 

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

  79. {

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

  81. }

  82. 

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

  84. {

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

  86.         return -1;

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

  88.     if (!avctx->extradata)

  89.         return AVERROR(ENOMEM);

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

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

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

  93.         return AVERROR(EIO);

  94.     return 0;

  95. }

  96. 

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

  98. {

  99.     char buf[1024];

  100.     int i;

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

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

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

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

  105.     }

  106. }

  107. 

  108. RMStream *ff_rm_alloc_rmstream (void)

  109. {

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

  111.     rms->curpic_num = -1;

  112.     return rms;

  113. }

  114. 

  115. void ff_rm_free_rmstream (RMStream *rms)

  116. {

  117.     av_free_packet(&rms->pkt);

  118. }

  119. 

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

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

  122. {

  123.     char buf[256];

  124.     uint32_t version;

  125.     int ret;

  126. 

  127.     /* ra type header */

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

  129.     if (version == 3) {

  130.         int header_size = avio_rb16(pb);

  131.         int64_t startpos = avio_tell(pb);

  132.         avio_skip(pb, 14);

  133.         rm_read_metadata(s, 0);

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

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

  136.             avio_r8(pb);

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

  138.         }

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

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

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

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

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

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

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

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

  147.         ast->deint_id = DEINT_ID_INT0;

  148.     } else {

  149.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  150.         int codecdata_length;

  151.         /* old version (4) */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  166.         if (version == 5) {

  167.             avio_rb16(pb); avio_rb16(pb); avio_rb16(pb);

  168.         }

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

  170.         avio_rb32(pb);

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

  172.         if (version == 5) {

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

  174.             avio_read(pb, buf, 4);

  175.             buf[4] = 0;

  176.         } else {

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

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

  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. 

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

  187.         case AV_CODEC_ID_AC3:

  188.             st->need_parsing = AVSTREAM_PARSE_FULL;

  189.             break;

  190.         case AV_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.             break;

  195.         case AV_CODEC_ID_COOK:

  196.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  197.         case AV_CODEC_ID_ATRAC3:

  198.         case AV_CODEC_ID_SIPR:

  199.             if (read_all) {

  200.                 codecdata_length = 0;

  201.             } else {

  202.             avio_rb16(pb); avio_r8(pb);

  203.             if (version == 5)

  204.                 avio_r8(pb);

  205.             codecdata_length = avio_rb32(pb);

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

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

  208.                 return -1;

  209.             }

  210.             }

  211. 

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

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

  214.                 if (flavor > 3) {

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

  216.                            flavor);

  217.                     return -1;

  218.                 }

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

  220.             } else {

  221.                 if(sub_packet_size <= 0){

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

  223.                     return -1;

  224.                 }

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

  226.             }

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

  228.                 return ret;

  229. 

  230.             break;

  231.         case AV_CODEC_ID_AAC:

  232.             avio_rb16(pb); avio_r8(pb);

  233.             if (version == 5)

  234.                 avio_r8(pb);

  235.             codecdata_length = avio_rb32(pb);

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

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

  238.                 return -1;

  239.             }

  240.             if (codecdata_length >= 1) {

  241.                 avio_r8(pb);

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

  243.                     return ret;

  244.             }

  245.             break;

  246.         default:

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

  248.         }

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

  250.             ast->deint_id == DEINT_ID_GENR ||

  251.             ast->deint_id == DEINT_ID_SIPR) {

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

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

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

  255.                 return AVERROR_INVALIDDATA;

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

  257.                 return AVERROR(ENOMEM);

  258.         }

  259.         switch (ast->deint_id) {

  260.         case DEINT_ID_INT4:

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

  262.                 sub_packet_h <= 1 ||

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

  264.                 return AVERROR_INVALIDDATA;

  265.             break;

  266.         case DEINT_ID_GENR:

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

  268.                 ast->sub_packet_size > ast->audio_framesize)

  269.                 return AVERROR_INVALIDDATA;

  270.             break;

  271.         case DEINT_ID_SIPR:

  272.         case DEINT_ID_INT0:

  273.         case DEINT_ID_VBRS:

  274.         case DEINT_ID_VBRF:

  275.             break;

  276.         default:

  277.             av_log(s, AV_LOG_ERROR, "Unknown interleaver %X\n", ast->deint_id);

  278.             return AVERROR_INVALIDDATA;

  279.         }

  280. 

  281.         if (read_all) {

  282.             avio_r8(pb);

  283.             avio_r8(pb);

  284.             avio_r8(pb);

  285.             rm_read_metadata(s, 0);

  286.         }

  287.     }

  288.     return 0;

  289. }

  290. 

  291. int

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

  293.                            AVStream *st, RMStream *rst, int codec_data_size, const uint8_t *mime)

  294. {

  295.     unsigned int v;

  296.     int size;

  297.     int64_t codec_pos;

  298.     int ret;

  299. 

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

  301.     codec_pos = avio_tell(pb);

  302.     v = avio_rb32(pb);

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

  304.         /* ra type header */

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

  306.             return -1;

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

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

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

  310.             return ret;

  311. 

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

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

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

  315.                                                 st->codec->codec_tag);

  316.     } else if(mime && !strcmp(mime, "logical-fileinfo")){

  317.         int stream_count, rule_count, property_count, i;

  318.         ff_free_stream(s, st);

  319.         if (avio_rb16(pb) != 0) {

  320.             av_log(s, AV_LOG_WARNING, "Unsupported version\n");

  321.             goto skip;

  322.         }

  323.         stream_count = avio_rb16(pb);

  324.         avio_skip(pb, 6*stream_count);

  325.         rule_count = avio_rb16(pb);

  326.         avio_skip(pb, 2*rule_count);

  327.         property_count = avio_rb16(pb);

  328.         for(i=0; i<property_count; i++){

  329.             uint8_t name[128], val[128];

  330.             avio_rb32(pb);

  331.             if (avio_rb16(pb) != 0) {

  332.                 av_log(s, AV_LOG_WARNING, "Unsupported Name value property version\n");

  333.                 goto skip; //FIXME skip just this one

  334.             }

  335.             get_str8(pb, name, sizeof(name));

  336.             switch(avio_rb32(pb)) {

  337.             case 2: get_strl(pb, val, sizeof(val), avio_rb16(pb));

  338.                 av_dict_set(&s->metadata, name, val, 0);

  339.                 break;

  340.             default: avio_skip(pb, avio_rb16(pb));

  341.             }

  342.         }

  343.     } else {

  344.         int fps;

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

  346.         fail1:

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

  348.             goto skip;

  349.         }

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

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

  352.                                                st->codec->codec_tag);

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

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

  355.             goto fail1;

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

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

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

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

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

  361.         st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  362.         fps = avio_rb32(pb);

  363. 

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

  365.             return ret;

  366. 

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

  368.                   0x10000, fps, (1 << 30) - 1);

  369. #if FF_API_R_FRAME_RATE

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

  371. #endif

  372.     }

  373. 

  374. skip:

  375.     /* skip codec info */

  376.     size = avio_tell(pb) - codec_pos;

  377.     avio_skip(pb, codec_data_size - size);

  378. 

  379.     return 0;

  380. }

  381. 

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

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

  384. static int rm_read_index(AVFormatContext *s)

  385. {

  386.     AVIOContext *pb = s->pb;

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

  388.     AVStream *st;

  389. 

  390.     do {

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

  392.             return -1;

  393.         size     = avio_rb32(pb);

  394.         if (size < 20)

  395.             return -1;

  396.         avio_skip(pb, 2);

  397.         n_pkts   = avio_rb32(pb);

  398.         str_id   = avio_rb16(pb);

  399.         next_off = avio_rb32(pb);

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

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

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

  403.                 break;

  404.             }

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

  406.             av_log(s, AV_LOG_ERROR,

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

  408.                    str_id, avio_tell(pb));

  409.             goto skip;

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

  411.             av_log(s, AV_LOG_ERROR,

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

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

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

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

  416.             goto skip;

  417.         }

  418. 

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

  420.             avio_skip(pb, 2);

  421.             pts = avio_rb32(pb);

  422.             pos = avio_rb32(pb);

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

  424. 

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

  426.         }

  427. 

  428. skip:

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

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

  431.             av_log(s, AV_LOG_ERROR,

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

  433.             return -1;

  434.         }

  435.     } while (next_off);

  436. 

  437.     return 0;

  438. }

  439. 

  440. static int rm_read_header_old(AVFormatContext *s)

  441. {

  442.     RMDemuxContext *rm = s->priv_data;

  443.     AVStream *st;

  444. 

  445.     rm->old_format = 1;

  446.     st = avformat_new_stream(s, NULL);

  447.     if (!st)

  448.         return -1;

  449.     st->priv_data = ff_rm_alloc_rmstream();

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

  451. }

  452. 

  453. static int rm_read_header(AVFormatContext *s)

  454. {

  455.     RMDemuxContext *rm = s->priv_data;

  456.     AVStream *st;

  457.     AVIOContext *pb = s->pb;

  458.     unsigned int tag;

  459.     int tag_size;

  460.     unsigned int start_time, duration;

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

  462.     char buf[128], mime[128];

  463.     int flags = 0;

  464. 

  465.     tag = avio_rl32(pb);

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

  467.         /* very old .ra format */

  468.         return rm_read_header_old(s);

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

  470.         return AVERROR(EIO);

  471.     }

  472. 

  473.     tag_size = avio_rb32(pb);

  474.     avio_skip(pb, tag_size - 8);

  475. 

  476.     for(;;) {

  477.         if (url_feof(pb))

  478.             return -1;

  479.         tag = avio_rl32(pb);

  480.         tag_size = avio_rb32(pb);

  481.         avio_rb16(pb);

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

  483.                 (tag      ) & 0xff,

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

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

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

  487.                 tag,

  488.                 tag_size);

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

  490.             return -1;

  491.         switch(tag) {

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

  493.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

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

  506.             break;

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

  508.             rm_read_metadata(s, 1);

  509.             break;

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

  511.             st = avformat_new_stream(s, NULL);

  512.             if (!st)

  513.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  522.             st->start_time = start_time;

  523.             st->duration = duration;

  524.             if(duration>0)

  525.                 s->duration = AV_NOPTS_VALUE;

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

  527.             get_str8(pb, mime, sizeof(mime)); /* mimetype */

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

  529.             st->priv_data = ff_rm_alloc_rmstream();

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

  531.                                           avio_rb32(pb), mime) < 0)

  532.                 return -1;

  533.             break;

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

  535.             goto header_end;

  536.         default:

  537.             /* unknown tag: skip it */

  538.             avio_skip(pb, tag_size - 10);

  539.             break;

  540.         }

  541.     }

  542.  header_end:

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

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

  545.         rm->nb_packets = 3600 * 25;

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

  547. 

  548.     if (!data_off)

  549.         data_off = avio_tell(pb) - 18;

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

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

  552.         rm_read_index(s);

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

  554.     }

  555. 

  556.     return 0;

  557. }

  558. 

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

  560. {

  561.     int n, n1;

  562. 

  563.     n = avio_rb16(pb);

  564.     (*len)-=2;

  565.     n &= 0x7FFF;

  566.     if (n >= 0x4000) {

  567.         return n - 0x4000;

  568.     } else {

  569.         n1 = avio_rb16(pb);

  570.         (*len)-=2;

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

  572.     }

  573. }

  574. 

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

  576. #define RAW_PACKET_SIZE 1000

  577. 

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

  579.     RMDemuxContext *rm = s->priv_data;

  580.     AVIOContext *pb = s->pb;

  581.     AVStream *st;

  582.     uint32_t state=0xFFFFFFFF;

  583. 

  584.     while(!url_feof(pb)){

  585.         int len, num, i;

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

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

  588.             num= rm->current_stream;

  589.             len= rm->remaining_len;

  590.             *timestamp = AV_NOPTS_VALUE;

  591.             *flags= 0;

  592.         }else{

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

  594. 

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

  596.                 int n_pkts, expected_len;

  597.                 len = avio_rb32(pb);

  598.                 avio_skip(pb, 2);

  599.                 n_pkts = avio_rb32(pb);

  600.                 expected_len = 20 + n_pkts * 14;

  601.                 if (len == 20)

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

  603.                     len = expected_len;

  604.                 else if (len != expected_len)

  605.                     av_log(s, AV_LOG_WARNING,

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

  607.                            len, n_pkts, expected_len);

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

  609.                 if(len<0)

  610.                     continue;

  611.                 goto skip;

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

  613.                 av_log(s, AV_LOG_WARNING,

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

  615.             }

  616. 

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

  618.                 continue;

  619.             len=state - 12;

  620.             state= 0xFFFFFFFF;

  621. 

  622.             num = avio_rb16(pb);

  623.             *timestamp = avio_rb32(pb);

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

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

  626.         }

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

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

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

  630.                 break;

  631.         }

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

  633. skip:

  634.             /* skip packet if unknown number */

  635.             avio_skip(pb, len);

  636.             rm->remaining_len = 0;

  637.             continue;

  638.         }

  639.         *stream_index= i;

  640. 

  641.         return len;

  642.     }

  643.     return -1;

  644. }

  645. 

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

  647.                                    RMDemuxContext *rm, RMStream *vst,

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

  649.                                    int64_t *timestamp)

  650. {

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

  652.     int type;

  653. 

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

  655.     type = hdr >> 6;

  656. 

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

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

  659.     }

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

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

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

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

  664.     }

  665.     if(len<0)

  666.         return -1;

  667.     rm->remaining_len = len;

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

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

  670.             len= len2;

  671.             *timestamp = pos;

  672.         }

  673.         if(rm->remaining_len < len)

  674.             return -1;

  675.         rm->remaining_len -= len;

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

  677.             return AVERROR(EIO);

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

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

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

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

  682.         return 0;

  683.     }

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

  685. 

  686.     *pseq = seq;

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

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

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

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

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

  692.             return AVERROR(ENOMEM);

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

  694.         vst->cur_slice = 0;

  695.         vst->curpic_num = pic_num;

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

  697.     }

  698.     if(type == 2)

  699.         len = FFMIN(len, pos);

  700. 

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

  702.         return 1;

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

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

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

  706.         return 1;

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

  708.         return AVERROR(EIO);

  709.     vst->videobufpos += len;

  710.     rm->remaining_len-= len;

  711. 

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

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

  714.         *pkt= vst->pkt;

  715.         vst->pkt.data= NULL;

  716.         vst->pkt.size= 0;

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

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

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

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

  721.         pkt->pts = AV_NOPTS_VALUE;

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

  723.         vst->slices = 0;

  724.         return 0;

  725.     }

  726. 

  727.     return 1;

  728. }

  729. 

  730. static inline void

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

  732. {

  733.     uint8_t *ptr;

  734.     int j;

  735. 

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

  737.         ptr = pkt->data;

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

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

  740.             ptr += 2;

  741.         }

  742.     }

  743. }

  744. 

  745. int

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

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

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

  749. {

  750.     RMDemuxContext *rm = s->priv_data;

  751. 

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

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

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

  755.             return -1; //got partial frame

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

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

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

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

  760.             int x;

  761.             int sps = ast->sub_packet_size;

  762.             int cfs = ast->coded_framesize;

  763.             int h = ast->sub_packet_h;

  764.             int y = ast->sub_packet_cnt;

  765.             int w = ast->audio_framesize;

  766. 

  767.             if (flags & 2)

  768.                 y = ast->sub_packet_cnt = 0;

  769.             if (!y)

  770.                 ast->audiotimestamp = timestamp;

  771. 

  772.             switch (ast->deint_id) {

  773.                 case DEINT_ID_INT4:

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

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

  776.                     break;

  777.                 case DEINT_ID_GENR:

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

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

  780.                     break;

  781.                 case DEINT_ID_SIPR:

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

  783.                     break;

  784.             }

  785. 

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

  787.                 return -1;

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

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

  790. 

  791.              ast->sub_packet_cnt = 0;

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

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

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

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

  796.             int x;

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

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

  799.             if (ast->sub_packet_cnt) {

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

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

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

  803.                 ast->audiotimestamp = timestamp;

  804.             } else

  805.                 return -1;

  806.         } else {

  807.             av_get_packet(pb, pkt, len);

  808.             rm_ac3_swap_bytes(st, pkt);

  809.         }

  810.     } else

  811.         av_get_packet(pb, pkt, len);

  812. 

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

  814. 

  815. #if 0

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

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

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

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

  820. 

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

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

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

  824.         }

  825.     }

  826. #endif

  827. 

  828.     pkt->pts = timestamp;

  829.     if (flags & 2)

  830.         pkt->flags |= AV_PKT_FLAG_KEY;

  831. 

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

  833. }

  834. 

  835. int

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

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

  838. {

  839.     RMDemuxContext *rm = s->priv_data;

  840. 

  841.     av_assert0 (rm->audio_pkt_cnt > 0);

  842. 

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

  844.         ast->deint_id == DEINT_ID_VBRS)

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

  846.     else {

  847.         if(av_new_packet(pkt, st->codec->block_align) < 0)

  848.             return AVERROR(ENOMEM);

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

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

  851.                st->codec->block_align);

  852.     }

  853.     rm->audio_pkt_cnt--;

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

  855.         ast->audiotimestamp = AV_NOPTS_VALUE;

  856.         pkt->flags = AV_PKT_FLAG_KEY;

  857.     } else

  858.         pkt->flags = 0;

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

  860. 

  861.     return rm->audio_pkt_cnt;

  862. }

  863. 

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

  865. {

  866.     RMDemuxContext *rm = s->priv_data;

  867.     AVStream *st;

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

  869.     int64_t timestamp, pos;

  870.     int flags;

  871. 

  872.     for (;;) {

  873.         if (rm->audio_pkt_cnt) {

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

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

  876.             res = ff_rm_retrieve_cache(s, s->pb, st, st->priv_data, pkt);

  877.             if(res < 0)

  878.                 return res;

  879.             flags = 0;

  880.         } else {

  881.             if (rm->old_format) {

  882.                 RMStream *ast;

  883. 

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

  885.                 ast = st->priv_data;

  886.                 timestamp = AV_NOPTS_VALUE;

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

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

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

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

  891.             } else {

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

  893.                 if (len > 0)

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

  895.             }

  896. 

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

  898.                 return AVERROR(EIO);

  899. 

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

  901.                                       &seq, flags, timestamp);

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

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

  904.             if (res)

  905.                 continue;

  906.         }

  907. 

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

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

  910.             av_free_packet(pkt);

  911.         } else

  912.             break;

  913.     }

  914. 

  915.     return 0;

  916. }

  917. 

  918. static int rm_read_close(AVFormatContext *s)

  919. {

  920.     int i;

  921. 

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

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

  924. 

  925.     return 0;

  926. }

  927. 

  928. static int rm_probe(AVProbeData *p)

  929. {

  930.     /* check file header */

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

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

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

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

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

  936.         return AVPROBE_SCORE_MAX;

  937.     else

  938.         return 0;

  939. }

  940. 

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

  942.                                int64_t *ppos, int64_t pos_limit)

  943. {

  944.     RMDemuxContext *rm = s->priv_data;

  945.     int64_t pos, dts;

  946.     int stream_index2, flags, len, h;

  947. 

  948.     pos = *ppos;

  949. 

  950.     if(rm->old_format)

  951.         return AV_NOPTS_VALUE;

  952. 

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

  954.         return AV_NOPTS_VALUE;

  955. 

  956.     rm->remaining_len=0;

  957.     for(;;){

  958.         int seq=1;

  959.         AVStream *st;

  960. 

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

  962.         if(len<0)

  963.             return AV_NOPTS_VALUE;

  964. 

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

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

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

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

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

  970.             }

  971.         }

  972. 

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

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

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

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

  977.             if(stream_index2 == stream_index)

  978.                 break;

  979.         }

  980. 

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

  982.     }

  983.     *ppos = pos;

  984.     return dts;

  985. }

  986. 

  987. AVInputFormat ff_rm_demuxer = {

  988.     .name           = "rm",

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

  990.     .priv_data_size = sizeof(RMDemuxContext),

  991.     .read_probe     = rm_probe,

  992.     .read_header    = rm_read_header,

  993.     .read_packet    = rm_read_packet,

  994.     .read_close     = rm_read_close,

  995.     .read_timestamp = rm_read_dts,

  996. };

  997. 

  998. AVInputFormat ff_rdt_demuxer = {

  999.     .name           = "rdt",

  1000.     .long_name      = NULL_IF_CONFIG_SMALL("RDT demuxer"),

  1001.     .priv_data_size = sizeof(RMDemuxContext),

  1002.     .read_close     = rm_read_close,

  1003.     .flags          = AVFMT_NOFILE,

  1004. };