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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/channel_layout.h"

  24. #include "libavutil/intreadwrite.h"

  25. #include "libavutil/dict.h"

  26. #include "avformat.h"

  27. #include "internal.h"

  28. #include "rmsipr.h"

  29. #include "rm.h"

  30. 

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

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

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

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

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

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

  37. 

  38. struct RMStream {

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

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

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

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

  43.     int cur_slice, slices;

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

  45.     /// Audio descrambling matrix parameters

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

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

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

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

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

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

  52. };

  53. 

  54. typedef struct {

  55.     int nb_packets;

  56.     int old_format;

  57.     int current_stream;

  58.     int remaining_len;

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

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

  61. } RMDemuxContext;

  62. 

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

  64. {

  65.     int i;

  66.     char *q, r;

  67. 

  68.     q = buf;

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

  70.         r = avio_r8(pb);

  71.         if (i < buf_size - 1)

  72.             *q++ = r;

  73.     }

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

  75. }

  76. 

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

  78. {

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

  80. }

  81. 

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

  83. {

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

  85.         return -1;

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

  87.     if (!avctx->extradata)

  88.         return AVERROR(ENOMEM);

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

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

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

  92.         return AVERROR(EIO);

  93.     return 0;

  94. }

  95. 

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

  97. {

  98.     char buf[1024];

  99.     int i;

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

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

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

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

  104.     }

  105. }

  106. 

  107. RMStream *ff_rm_alloc_rmstream (void)

  108. {

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

  110.     rms->curpic_num = -1;

  111.     return rms;

  112. }

  113. 

  114. void ff_rm_free_rmstream (RMStream *rms)

  115. {

  116.     av_free_packet(&rms->pkt);

  117. }

  118. 

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

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

  121. {

  122.     char buf[256];

  123.     uint32_t version;

  124.     int ret;

  125. 

  126.     /* ra type header */

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

  128.     if (version == 3) {

  129.         int header_size = avio_rb16(pb);

  130.         int64_t startpos = avio_tell(pb);

  131.         avio_skip(pb, 14);

  132.         rm_read_metadata(s, 0);

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

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

  135.             avio_r8(pb);

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

  137.         }

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

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

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

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

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

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

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

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

  146.         ast->deint_id = DEINT_ID_INT0;

  147.     } else {

  148.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  149.         int codecdata_length;

  150.         /* old version (4) */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  165.         if (version == 5) {

  166.             avio_rb16(pb); avio_rb16(pb); avio_rb16(pb);

  167.         }

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

  169.         avio_rb32(pb);

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

  171.         if (version == 5) {

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

  173.             avio_read(pb, buf, 4);

  174.             buf[4] = 0;

  175.         } else {

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

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

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

  179.         }

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

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

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

  183.                                                 st->codec->codec_tag);

  184. 

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

  186.         case AV_CODEC_ID_AC3:

  187.             st->need_parsing = AVSTREAM_PARSE_FULL;

  188.             break;

  189.         case AV_CODEC_ID_RA_288:

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

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

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

  193.             break;

  194.         case AV_CODEC_ID_COOK:

  195.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  196.         case AV_CODEC_ID_ATRAC3:

  197.         case AV_CODEC_ID_SIPR:

  198.             avio_rb16(pb); avio_r8(pb);

  199.             if (version == 5)

  200.                 avio_r8(pb);

  201.             codecdata_length = avio_rb32(pb);

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

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

  204.                 return -1;

  205.             }

  206. 

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

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

  209.                 if (flavor > 3) {

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

  211.                            flavor);

  212.                     return -1;

  213.                 }

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

  215.             } else {

  216.                 if(sub_packet_size <= 0){

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

  218.                     return -1;

  219.                 }

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

  221.             }

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

  223.                 return ret;

  224.             break;

  225.         case AV_CODEC_ID_AAC:

  226.             avio_rb16(pb); avio_r8(pb);

  227.             if (version == 5)

  228.                 avio_r8(pb);

  229.             codecdata_length = avio_rb32(pb);

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

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

  232.                 return -1;

  233.             }

  234.             if (codecdata_length >= 1) {

  235.                 avio_r8(pb);

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

  237.                     return ret;

  238.             }

  239.             break;

  240.         default:

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

  242.         }

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

  244.             ast->deint_id == DEINT_ID_GENR ||

  245.             ast->deint_id == DEINT_ID_SIPR) {

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

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

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

  249.                 return AVERROR_INVALIDDATA;

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

  251.                 return AVERROR(ENOMEM);

  252.         }

  253.         switch (ast->deint_id) {

  254.         case DEINT_ID_INT4:

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

  256.                 sub_packet_h <= 1 ||

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

  258.                 return AVERROR_INVALIDDATA;

  259.             break;

  260.         case DEINT_ID_GENR:

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

  262.                 ast->sub_packet_size > ast->audio_framesize)

  263.                 return AVERROR_INVALIDDATA;

  264.             break;

  265.         case DEINT_ID_SIPR:

  266.         case DEINT_ID_INT0:

  267.         case DEINT_ID_VBRS:

  268.         case DEINT_ID_VBRF:

  269.             break;

  270.         default:

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

  272.             return AVERROR_INVALIDDATA;

  273.         }

  274. 

  275.         if (read_all) {

  276.             avio_r8(pb);

  277.             avio_r8(pb);

  278.             avio_r8(pb);

  279.             rm_read_metadata(s, 0);

  280.         }

  281.     }

  282.     return 0;

  283. }

  284. 

  285. int

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

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

  288. {

  289.     unsigned int v;

  290.     int size;

  291.     int64_t codec_pos;

  292.     int ret;

  293. 

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

  295.     codec_pos = avio_tell(pb);

  296.     v = avio_rb32(pb);

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

  298.         /* ra type header */

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

  300.             return -1;

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

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

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

  304.             return ret;

  305. 

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

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

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

  309.                                                 st->codec->codec_tag);

  310.     } else {

  311.         int fps;

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

  313.         fail1:

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

  315.             goto skip;

  316.         }

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

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

  319.                                                st->codec->codec_tag);

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

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

  322.             goto fail1;

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

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

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

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

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

  328.         st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  329.         fps = avio_rb32(pb);

  330. 

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

  332.             return ret;

  333. 

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

  335.                   0x10000, fps, (1 << 30) - 1);

  336. #if FF_API_R_FRAME_RATE

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

  338. #endif

  339.     }

  340. 

  341. skip:

  342.     /* skip codec info */

  343.     size = avio_tell(pb) - codec_pos;

  344.     avio_skip(pb, codec_data_size - size);

  345. 

  346.     return 0;

  347. }

  348. 

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

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

  351. static int rm_read_index(AVFormatContext *s)

  352. {

  353.     AVIOContext *pb = s->pb;

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

  355.     AVStream *st;

  356. 

  357.     do {

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

  359.             return -1;

  360.         size     = avio_rb32(pb);

  361.         if (size < 20)

  362.             return -1;

  363.         avio_skip(pb, 2);

  364.         n_pkts   = avio_rb32(pb);

  365.         str_id   = avio_rb16(pb);

  366.         next_off = avio_rb32(pb);

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

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

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

  370.                 break;

  371.             }

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

  373.             av_log(s, AV_LOG_ERROR,

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

  375.                    str_id, avio_tell(pb));

  376.             goto skip;

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

  378.             av_log(s, AV_LOG_ERROR,

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

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

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

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

  383.             goto skip;

  384.         }

  385. 

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

  387.             avio_skip(pb, 2);

  388.             pts = avio_rb32(pb);

  389.             pos = avio_rb32(pb);

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

  391. 

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

  393.         }

  394. 

  395. skip:

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

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

  398.             av_log(s, AV_LOG_ERROR,

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

  400.             return -1;

  401.         }

  402.     } while (next_off);

  403. 

  404.     return 0;

  405. }

  406. 

  407. static int rm_read_header_old(AVFormatContext *s)

  408. {

  409.     RMDemuxContext *rm = s->priv_data;

  410.     AVStream *st;

  411. 

  412.     rm->old_format = 1;

  413.     st = avformat_new_stream(s, NULL);

  414.     if (!st)

  415.         return -1;

  416.     st->priv_data = ff_rm_alloc_rmstream();

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

  418. }

  419. 

  420. static int rm_read_header(AVFormatContext *s)

  421. {

  422.     RMDemuxContext *rm = s->priv_data;

  423.     AVStream *st;

  424.     AVIOContext *pb = s->pb;

  425.     unsigned int tag;

  426.     int tag_size;

  427.     unsigned int start_time, duration;

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

  429.     char buf[128];

  430.     int flags = 0;

  431. 

  432.     tag = avio_rl32(pb);

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

  434.         /* very old .ra format */

  435.         return rm_read_header_old(s);

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

  437.         return AVERROR(EIO);

  438.     }

  439. 

  440.     tag_size = avio_rb32(pb);

  441.     avio_skip(pb, tag_size - 8);

  442. 

  443.     for(;;) {

  444.         if (pb->eof_reached)

  445.             return -1;

  446.         tag = avio_rl32(pb);

  447.         tag_size = avio_rb32(pb);

  448.         avio_rb16(pb);

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

  450.                 (tag      ) & 0xff,

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

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

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

  454.                 tag,

  455.                 tag_size);

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

  457.             return -1;

  458.         switch(tag) {

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

  460.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

  472.             break;

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

  474.             rm_read_metadata(s, 1);

  475.             break;

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

  477.             st = avformat_new_stream(s, NULL);

  478.             if (!st)

  479.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  488.             st->start_time = start_time;

  489.             st->duration = duration;

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

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

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

  493.             st->priv_data = ff_rm_alloc_rmstream();

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

  495.                                           avio_rb32(pb)) < 0)

  496.                 return -1;

  497.             break;

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

  499.             goto header_end;

  500.         default:

  501.             /* unknown tag: skip it */

  502.             avio_skip(pb, tag_size - 10);

  503.             break;

  504.         }

  505.     }

  506.  header_end:

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

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

  509.         rm->nb_packets = 3600 * 25;

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

  511. 

  512.     if (!data_off)

  513.         data_off = avio_tell(pb) - 18;

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

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

  516.         rm_read_index(s);

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

  518.     }

  519. 

  520.     return 0;

  521. }

  522. 

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

  524. {

  525.     int n, n1;

  526. 

  527.     n = avio_rb16(pb);

  528.     (*len)-=2;

  529.     n &= 0x7FFF;

  530.     if (n >= 0x4000) {

  531.         return n - 0x4000;

  532.     } else {

  533.         n1 = avio_rb16(pb);

  534.         (*len)-=2;

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

  536.     }

  537. }

  538. 

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

  540. #define RAW_PACKET_SIZE 1000

  541. 

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

  543.     RMDemuxContext *rm = s->priv_data;

  544.     AVIOContext *pb = s->pb;

  545.     AVStream *st;

  546.     uint32_t state=0xFFFFFFFF;

  547. 

  548.     while(!pb->eof_reached){

  549.         int len, num, i;

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

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

  552.             num= rm->current_stream;

  553.             len= rm->remaining_len;

  554.             *timestamp = AV_NOPTS_VALUE;

  555.             *flags= 0;

  556.         }else{

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

  558. 

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

  560.                 int n_pkts, expected_len;

  561.                 len = avio_rb32(pb);

  562.                 avio_skip(pb, 2);

  563.                 n_pkts = avio_rb32(pb);

  564.                 expected_len = 20 + n_pkts * 14;

  565.                 if (len == 20)

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

  567.                     len = expected_len;

  568.                 else if (len != expected_len)

  569.                     av_log(s, AV_LOG_WARNING,

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

  571.                            len, n_pkts, expected_len);

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

  573.                 if(len<0)

  574.                     continue;

  575.                 goto skip;

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

  577.                 av_log(s, AV_LOG_WARNING,

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

  579.             }

  580. 

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

  582.                 continue;

  583.             len=state - 12;

  584.             state= 0xFFFFFFFF;

  585. 

  586.             num = avio_rb16(pb);

  587.             *timestamp = avio_rb32(pb);

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

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

  590.         }

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

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

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

  594.                 break;

  595.         }

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

  597. skip:

  598.             /* skip packet if unknown number */

  599.             avio_skip(pb, len);

  600.             rm->remaining_len = 0;

  601.             continue;

  602.         }

  603.         *stream_index= i;

  604. 

  605.         return len;

  606.     }

  607.     return -1;

  608. }

  609. 

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

  611.                                    RMDemuxContext *rm, RMStream *vst,

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

  613.                                    int64_t *timestamp)

  614. {

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

  616.     int type;

  617. 

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

  619.     type = hdr >> 6;

  620. 

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

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

  623.     }

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

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

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

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

  628.     }

  629.     if(len<0)

  630.         return -1;

  631.     rm->remaining_len = len;

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

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

  634.             len= len2;

  635.             *timestamp = pos;

  636.         }

  637.         if(rm->remaining_len < len)

  638.             return -1;

  639.         rm->remaining_len -= len;

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

  641.             return AVERROR(EIO);

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

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

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

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

  646.         return 0;

  647.     }

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

  649. 

  650.     *pseq = seq;

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

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

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

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

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

  656.             return AVERROR(ENOMEM);

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

  658.         vst->cur_slice = 0;

  659.         vst->curpic_num = pic_num;

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

  661.     }

  662.     if(type == 2)

  663.         len = FFMIN(len, pos);

  664. 

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

  666.         return 1;

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

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

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

  670.         return 1;

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

  672.         return AVERROR(EIO);

  673.     vst->videobufpos += len;

  674.     rm->remaining_len-= len;

  675. 

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

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

  678.         *pkt= vst->pkt;

  679.         vst->pkt.data= NULL;

  680.         vst->pkt.size= 0;

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

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

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

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

  685.         pkt->pts = AV_NOPTS_VALUE;

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

  687.         vst->slices = 0;

  688.         return 0;

  689.     }

  690. 

  691.     return 1;

  692. }

  693. 

  694. static inline void

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

  696. {

  697.     uint8_t *ptr;

  698.     int j;

  699. 

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

  701.         ptr = pkt->data;

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

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

  704.             ptr += 2;

  705.         }

  706.     }

  707. }

  708. 

  709. int

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

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

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

  713. {

  714.     RMDemuxContext *rm = s->priv_data;

  715. 

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

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

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

  719.             return -1; //got partial frame

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

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

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

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

  724.             int x;

  725.             int sps = ast->sub_packet_size;

  726.             int cfs = ast->coded_framesize;

  727.             int h = ast->sub_packet_h;

  728.             int y = ast->sub_packet_cnt;

  729.             int w = ast->audio_framesize;

  730. 

  731.             if (flags & 2)

  732.                 y = ast->sub_packet_cnt = 0;

  733.             if (!y)

  734.                 ast->audiotimestamp = timestamp;

  735. 

  736.             switch (ast->deint_id) {

  737.                 case DEINT_ID_INT4:

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

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

  740.                     break;

  741.                 case DEINT_ID_GENR:

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

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

  744.                     break;

  745.                 case DEINT_ID_SIPR:

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

  747.                     break;

  748.             }

  749. 

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

  751.                 return -1;

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

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

  754. 

  755.              ast->sub_packet_cnt = 0;

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

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

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

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

  760.             int x;

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

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

  763.             if (ast->sub_packet_cnt) {

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

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

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

  767.                 ast->audiotimestamp = timestamp;

  768.             } else

  769.                 return -1;

  770.         } else {

  771.             av_get_packet(pb, pkt, len);

  772.             rm_ac3_swap_bytes(st, pkt);

  773.         }

  774.     } else

  775.         av_get_packet(pb, pkt, len);

  776. 

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

  778. 

  779. #if 0

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

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

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

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

  784. 

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

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

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

  788.         }

  789.     }

  790. #endif

  791. 

  792.     pkt->pts = timestamp;

  793.     if (flags & 2)

  794.         pkt->flags |= AV_PKT_FLAG_KEY;

  795. 

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

  797. }

  798. 

  799. int

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

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

  802. {

  803.     RMDemuxContext *rm = s->priv_data;

  804. 

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

  806. 

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

  808.         ast->deint_id == DEINT_ID_VBRS)

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

  810.     else {

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

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

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

  814.                st->codec->block_align);

  815.     }

  816.     rm->audio_pkt_cnt--;

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

  818.         ast->audiotimestamp = AV_NOPTS_VALUE;

  819.         pkt->flags = AV_PKT_FLAG_KEY;

  820.     } else

  821.         pkt->flags = 0;

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

  823. 

  824.     return rm->audio_pkt_cnt;

  825. }

  826. 

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

  828. {

  829.     RMDemuxContext *rm = s->priv_data;

  830.     AVStream *st;

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

  832.     int64_t timestamp, pos;

  833.     int flags;

  834. 

  835.     for (;;) {

  836.         if (rm->audio_pkt_cnt) {

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

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

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

  840.             flags = 0;

  841.         } else {

  842.             if (rm->old_format) {

  843.                 RMStream *ast;

  844. 

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

  846.                 ast = st->priv_data;

  847.                 timestamp = AV_NOPTS_VALUE;

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

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

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

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

  852.             } else {

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

  854.                 if (len > 0)

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

  856.             }

  857. 

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

  859.                 return AVERROR(EIO);

  860. 

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

  862.                                       &seq, flags, timestamp);

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

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

  865.             if (res)

  866.                 continue;

  867.         }

  868. 

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

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

  871.             av_free_packet(pkt);

  872.         } else

  873.             break;

  874.     }

  875. 

  876.     return 0;

  877. }

  878. 

  879. static int rm_read_close(AVFormatContext *s)

  880. {

  881.     int i;

  882. 

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

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

  885. 

  886.     return 0;

  887. }

  888. 

  889. static int rm_probe(AVProbeData *p)

  890. {

  891.     /* check file header */

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

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

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

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

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

  897.         return AVPROBE_SCORE_MAX;

  898.     else

  899.         return 0;

  900. }

  901. 

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

  903.                                int64_t *ppos, int64_t pos_limit)

  904. {

  905.     RMDemuxContext *rm = s->priv_data;

  906.     int64_t pos, dts;

  907.     int stream_index2, flags, len, h;

  908. 

  909.     pos = *ppos;

  910. 

  911.     if(rm->old_format)

  912.         return AV_NOPTS_VALUE;

  913. 

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

  915.     rm->remaining_len=0;

  916.     for(;;){

  917.         int seq=1;

  918.         AVStream *st;

  919. 

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

  921.         if(len<0)

  922.             return AV_NOPTS_VALUE;

  923. 

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

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

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

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

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

  929.             }

  930.         }

  931. 

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

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

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

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

  936.             if(stream_index2 == stream_index)

  937.                 break;

  938.         }

  939. 

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

  941.     }

  942.     *ppos = pos;

  943.     return dts;

  944. }

  945. 

  946. AVInputFormat ff_rm_demuxer = {

  947.     .name           = "rm",

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

  949.     .priv_data_size = sizeof(RMDemuxContext),

  950.     .read_probe     = rm_probe,

  951.     .read_header    = rm_read_header,

  952.     .read_packet    = rm_read_packet,

  953.     .read_close     = rm_read_close,

  954.     .read_timestamp = rm_read_dts,

  955. };

  956. 

  957. AVInputFormat ff_rdt_demuxer = {

  958.     .name           = "rdt",

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

  960.     .priv_data_size = sizeof(RMDemuxContext),

  961.     .read_close     = rm_read_close,

  962.     .flags          = AVFMT_NOFILE,

  963. };