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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 "riff.h"

  30. #include "rmsipr.h"

  31. #include "rm.h"

  32. 

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

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

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

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

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

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

  39. 

  40. struct RMStream {

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

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

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

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

  45.     int cur_slice, slices;

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

  47.     /// Audio descrambling matrix parameters

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

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

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

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

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

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

  54. };

  55. 

  56. typedef struct {

  57.     int nb_packets;

  58.     int old_format;

  59.     int current_stream;

  60.     int remaining_len;

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

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

  63. } RMDemuxContext;

  64. 

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

  66. {

  67.     int i;

  68.     char *q, r;

  69. 

  70.     q = buf;

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

  72.         r = avio_r8(pb);

  73.         if (i < buf_size - 1)

  74.             *q++ = r;

  75.     }

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

  77. }

  78. 

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

  80. {

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

  82. }

  83. 

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

  85. {

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

  87.         return -1;

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

  89.     if (!avctx->extradata)

  90.         return AVERROR(ENOMEM);

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

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

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

  94.         return AVERROR(EIO);

  95.     return 0;

  96. }

  97. 

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

  99. {

  100.     char buf[1024];

  101.     int i;

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

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

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

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

  106.     }

  107. }

  108. 

  109. RMStream *ff_rm_alloc_rmstream (void)

  110. {

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

  112.     rms->curpic_num = -1;

  113.     return rms;

  114. }

  115. 

  116. void ff_rm_free_rmstream (RMStream *rms)

  117. {

  118.     av_free_packet(&rms->pkt);

  119. }

  120. 

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

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

  123. {

  124.     char buf[256];

  125.     uint32_t version;

  126.     int ret;

  127. 

  128.     /* ra type header */

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

  130.     if (version == 3) {

  131.         int header_size = avio_rb16(pb);

  132.         int64_t startpos = avio_tell(pb);

  133.         avio_skip(pb, 14);

  134.         rm_read_metadata(s, 0);

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

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

  137.             avio_r8(pb);

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

  139.         }

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

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

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

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

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

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

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

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

  148.         ast->deint_id = DEINT_ID_INT0;

  149.     } else {

  150.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  151.         int codecdata_length;

  152.         /* old version (4) */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  167.         if (version == 5) {

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

  169.         }

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

  171.         avio_rb32(pb);

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

  173.         if (version == 5) {

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

  175.             avio_read(pb, buf, 4);

  176.             buf[4] = 0;

  177.         } else {

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

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

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

  181.         }

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

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

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

  185.                                                 st->codec->codec_tag);

  186. 

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

  188.         case AV_CODEC_ID_AC3:

  189.             st->need_parsing = AVSTREAM_PARSE_FULL;

  190.             break;

  191.         case AV_CODEC_ID_RA_288:

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

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

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

  195.             break;

  196.         case AV_CODEC_ID_COOK:

  197.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  198.         case AV_CODEC_ID_ATRAC3:

  199.         case AV_CODEC_ID_SIPR:

  200.             avio_rb16(pb); avio_r8(pb);

  201.             if (version == 5)

  202.                 avio_r8(pb);

  203.             codecdata_length = avio_rb32(pb);

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

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

  206.                 return -1;

  207.             }

  208. 

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

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

  211.                 if (flavor > 3) {

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

  213.                            flavor);

  214.                     return -1;

  215.                 }

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

  217.             } else {

  218.                 if(sub_packet_size <= 0){

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

  220.                     return -1;

  221.                 }

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

  223.             }

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

  225.                 return ret;

  226. 

  227.             break;

  228.         case AV_CODEC_ID_AAC:

  229.             avio_rb16(pb); avio_r8(pb);

  230.             if (version == 5)

  231.                 avio_r8(pb);

  232.             codecdata_length = avio_rb32(pb);

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

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

  235.                 return -1;

  236.             }

  237.             if (codecdata_length >= 1) {

  238.                 avio_r8(pb);

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

  240.                     return ret;

  241.             }

  242.             break;

  243.         default:

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

  245.         }

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

  247.             ast->deint_id == DEINT_ID_GENR ||

  248.             ast->deint_id == DEINT_ID_SIPR) {

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

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

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

  252.                 return AVERROR_INVALIDDATA;

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

  254.                 return AVERROR(ENOMEM);

  255.         }

  256.         switch (ast->deint_id) {

  257.         case DEINT_ID_INT4:

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

  259.                 sub_packet_h <= 1 ||

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

  261.                 return AVERROR_INVALIDDATA;

  262.             break;

  263.         case DEINT_ID_GENR:

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

  265.                 ast->sub_packet_size > ast->audio_framesize)

  266.                 return AVERROR_INVALIDDATA;

  267.             break;

  268.         case DEINT_ID_SIPR:

  269.         case DEINT_ID_INT0:

  270.         case DEINT_ID_VBRS:

  271.         case DEINT_ID_VBRF:

  272.             break;

  273.         default:

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

  275.             return AVERROR_INVALIDDATA;

  276.         }

  277. 

  278.         if (read_all) {

  279.             avio_r8(pb);

  280.             avio_r8(pb);

  281.             avio_r8(pb);

  282.             rm_read_metadata(s, 0);

  283.         }

  284.     }

  285.     return 0;

  286. }

  287. 

  288. int

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

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

  291. {

  292.     unsigned int v;

  293.     int size;

  294.     int64_t codec_pos;

  295.     int ret;

  296. 

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

  298.     codec_pos = avio_tell(pb);

  299.     v = avio_rb32(pb);

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

  301.         /* ra type header */

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

  303.             return -1;

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

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

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

  307.             return ret;

  308. 

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

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

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

  312.                                                 st->codec->codec_tag);

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

  314.         int stream_count, rule_count, property_count, i;

  315.         ff_free_stream(s, st);

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

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

  318.             goto skip;

  319.         }

  320.         stream_count = avio_rb16(pb);

  321.         avio_skip(pb, 6*stream_count);

  322.         rule_count = avio_rb16(pb);

  323.         avio_skip(pb, 2*rule_count);

  324.         property_count = avio_rb16(pb);

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

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

  327.             avio_rb32(pb);

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

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

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

  331.             }

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

  333.             switch(avio_rb32(pb)) {

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

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

  336.                 break;

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

  338.             }

  339.         }

  340.     } else {

  341.         int fps;

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

  343.         fail1:

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

  345.             goto skip;

  346.         }

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

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

  349.                                                st->codec->codec_tag);

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

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

  352.             goto fail1;

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

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

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

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

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

  358.         st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  359.         fps = avio_rb32(pb);

  360. 

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

  362.             return ret;

  363. 

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

  365.                   0x10000, fps, (1 << 30) - 1);

  366. #if FF_API_R_FRAME_RATE

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

  368. #endif

  369.     }

  370. 

  371. skip:

  372.     /* skip codec info */

  373.     size = avio_tell(pb) - codec_pos;

  374.     avio_skip(pb, codec_data_size - size);

  375. 

  376.     return 0;

  377. }

  378. 

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

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

  381. static int rm_read_index(AVFormatContext *s)

  382. {

  383.     AVIOContext *pb = s->pb;

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

  385.     AVStream *st;

  386. 

  387.     do {

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

  389.             return -1;

  390.         size     = avio_rb32(pb);

  391.         if (size < 20)

  392.             return -1;

  393.         avio_skip(pb, 2);

  394.         n_pkts   = avio_rb32(pb);

  395.         str_id   = avio_rb16(pb);

  396.         next_off = avio_rb32(pb);

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

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

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

  400.                 break;

  401.             }

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

  403.             av_log(s, AV_LOG_ERROR,

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

  405.                    str_id, avio_tell(pb));

  406.             goto skip;

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

  408.             av_log(s, AV_LOG_ERROR,

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

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

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

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

  413.             goto skip;

  414.         }

  415. 

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

  417.             avio_skip(pb, 2);

  418.             pts = avio_rb32(pb);

  419.             pos = avio_rb32(pb);

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

  421. 

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

  423.         }

  424. 

  425. skip:

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

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

  428.             av_log(s, AV_LOG_ERROR,

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

  430.             return -1;

  431.         }

  432.     } while (next_off);

  433. 

  434.     return 0;

  435. }

  436. 

  437. static int rm_read_header_old(AVFormatContext *s)

  438. {

  439.     RMDemuxContext *rm = s->priv_data;

  440.     AVStream *st;

  441. 

  442.     rm->old_format = 1;

  443.     st = avformat_new_stream(s, NULL);

  444.     if (!st)

  445.         return -1;

  446.     st->priv_data = ff_rm_alloc_rmstream();

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

  448. }

  449. 

  450. static int rm_read_header(AVFormatContext *s)

  451. {

  452.     RMDemuxContext *rm = s->priv_data;

  453.     AVStream *st;

  454.     AVIOContext *pb = s->pb;

  455.     unsigned int tag;

  456.     int tag_size;

  457.     unsigned int start_time, duration;

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

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

  460.     int flags = 0;

  461. 

  462.     tag = avio_rl32(pb);

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

  464.         /* very old .ra format */

  465.         return rm_read_header_old(s);

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

  467.         return AVERROR(EIO);

  468.     }

  469. 

  470.     tag_size = avio_rb32(pb);

  471.     avio_skip(pb, tag_size - 8);

  472. 

  473.     for(;;) {

  474.         if (url_feof(pb))

  475.             return -1;

  476.         tag = avio_rl32(pb);

  477.         tag_size = avio_rb32(pb);

  478.         avio_rb16(pb);

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

  480.                 (tag      ) & 0xff,

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

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

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

  484.                 tag,

  485.                 tag_size);

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

  487.             return -1;

  488.         switch(tag) {

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

  490.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

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

  503.             break;

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

  505.             rm_read_metadata(s, 1);

  506.             break;

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

  508.             st = avformat_new_stream(s, NULL);

  509.             if (!st)

  510.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  519.             st->start_time = start_time;

  520.             st->duration = duration;

  521.             if(duration>0)

  522.                 s->duration = AV_NOPTS_VALUE;

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

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

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

  526.             st->priv_data = ff_rm_alloc_rmstream();

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

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

  529.                 return -1;

  530.             break;

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

  532.             goto header_end;

  533.         default:

  534.             /* unknown tag: skip it */

  535.             avio_skip(pb, tag_size - 10);

  536.             break;

  537.         }

  538.     }

  539.  header_end:

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

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

  542.         rm->nb_packets = 3600 * 25;

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

  544. 

  545.     if (!data_off)

  546.         data_off = avio_tell(pb) - 18;

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

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

  549.         rm_read_index(s);

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

  551.     }

  552. 

  553.     return 0;

  554. }

  555. 

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

  557. {

  558.     int n, n1;

  559. 

  560.     n = avio_rb16(pb);

  561.     (*len)-=2;

  562.     n &= 0x7FFF;

  563.     if (n >= 0x4000) {

  564.         return n - 0x4000;

  565.     } else {

  566.         n1 = avio_rb16(pb);

  567.         (*len)-=2;

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

  569.     }

  570. }

  571. 

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

  573. #define RAW_PACKET_SIZE 1000

  574. 

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

  576.     RMDemuxContext *rm = s->priv_data;

  577.     AVIOContext *pb = s->pb;

  578.     AVStream *st;

  579.     uint32_t state=0xFFFFFFFF;

  580. 

  581.     while(!url_feof(pb)){

  582.         int len, num, i;

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

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

  585.             num= rm->current_stream;

  586.             len= rm->remaining_len;

  587.             *timestamp = AV_NOPTS_VALUE;

  588.             *flags= 0;

  589.         }else{

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

  591. 

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

  593.                 int n_pkts, expected_len;

  594.                 len = avio_rb32(pb);

  595.                 avio_skip(pb, 2);

  596.                 n_pkts = avio_rb32(pb);

  597.                 expected_len = 20 + n_pkts * 14;

  598.                 if (len == 20)

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

  600.                     len = expected_len;

  601.                 else if (len != expected_len)

  602.                     av_log(s, AV_LOG_WARNING,

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

  604.                            len, n_pkts, expected_len);

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

  606.                 if(len<0)

  607.                     continue;

  608.                 goto skip;

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

  610.                 av_log(s, AV_LOG_WARNING,

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

  612.             }

  613. 

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

  615.                 continue;

  616.             len=state - 12;

  617.             state= 0xFFFFFFFF;

  618. 

  619.             num = avio_rb16(pb);

  620.             *timestamp = avio_rb32(pb);

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

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

  623.         }

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

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

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

  627.                 break;

  628.         }

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

  630. skip:

  631.             /* skip packet if unknown number */

  632.             avio_skip(pb, len);

  633.             rm->remaining_len = 0;

  634.             continue;

  635.         }

  636.         *stream_index= i;

  637. 

  638.         return len;

  639.     }

  640.     return -1;

  641. }

  642. 

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

  644.                                    RMDemuxContext *rm, RMStream *vst,

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

  646.                                    int64_t *timestamp)

  647. {

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

  649.     int type;

  650. 

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

  652.     type = hdr >> 6;

  653. 

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

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

  656.     }

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

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

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

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

  661.     }

  662.     if(len<0)

  663.         return -1;

  664.     rm->remaining_len = len;

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

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

  667.             len= len2;

  668.             *timestamp = pos;

  669.         }

  670.         if(rm->remaining_len < len)

  671.             return -1;

  672.         rm->remaining_len -= len;

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

  674.             return AVERROR(EIO);

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

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

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

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

  679.         return 0;

  680.     }

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

  682. 

  683.     *pseq = seq;

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

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

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

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

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

  689.             return AVERROR(ENOMEM);

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

  691.         vst->cur_slice = 0;

  692.         vst->curpic_num = pic_num;

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

  694.     }

  695.     if(type == 2)

  696.         len = FFMIN(len, pos);

  697. 

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

  699.         return 1;

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

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

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

  703.         return 1;

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

  705.         return AVERROR(EIO);

  706.     vst->videobufpos += len;

  707.     rm->remaining_len-= len;

  708. 

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

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

  711.         *pkt= vst->pkt;

  712.         vst->pkt.data= NULL;

  713.         vst->pkt.size= 0;

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

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

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

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

  718.         pkt->pts = AV_NOPTS_VALUE;

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

  720.         vst->slices = 0;

  721.         return 0;

  722.     }

  723. 

  724.     return 1;

  725. }

  726. 

  727. static inline void

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

  729. {

  730.     uint8_t *ptr;

  731.     int j;

  732. 

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

  734.         ptr = pkt->data;

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

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

  737.             ptr += 2;

  738.         }

  739.     }

  740. }

  741. 

  742. int

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

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

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

  746. {

  747.     RMDemuxContext *rm = s->priv_data;

  748. 

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

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

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

  752.             return -1; //got partial frame

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

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

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

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

  757.             int x;

  758.             int sps = ast->sub_packet_size;

  759.             int cfs = ast->coded_framesize;

  760.             int h = ast->sub_packet_h;

  761.             int y = ast->sub_packet_cnt;

  762.             int w = ast->audio_framesize;

  763. 

  764.             if (flags & 2)

  765.                 y = ast->sub_packet_cnt = 0;

  766.             if (!y)

  767.                 ast->audiotimestamp = timestamp;

  768. 

  769.             switch (ast->deint_id) {

  770.                 case DEINT_ID_INT4:

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

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

  773.                     break;

  774.                 case DEINT_ID_GENR:

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

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

  777.                     break;

  778.                 case DEINT_ID_SIPR:

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

  780.                     break;

  781.             }

  782. 

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

  784.                 return -1;

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

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

  787. 

  788.              ast->sub_packet_cnt = 0;

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

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

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

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

  793.             int x;

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

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

  796.             if (ast->sub_packet_cnt) {

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

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

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

  800.                 ast->audiotimestamp = timestamp;

  801.             } else

  802.                 return -1;

  803.         } else {

  804.             av_get_packet(pb, pkt, len);

  805.             rm_ac3_swap_bytes(st, pkt);

  806.         }

  807.     } else

  808.         av_get_packet(pb, pkt, len);

  809. 

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

  811. 

  812. #if 0

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

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

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

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

  817. 

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

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

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

  821.         }

  822.     }

  823. #endif

  824. 

  825.     pkt->pts = timestamp;

  826.     if (flags & 2)

  827.         pkt->flags |= AV_PKT_FLAG_KEY;

  828. 

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

  830. }

  831. 

  832. int

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

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

  835. {

  836.     RMDemuxContext *rm = s->priv_data;

  837. 

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

  839. 

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

  841.         ast->deint_id == DEINT_ID_VBRS)

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

  843.     else {

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

  845.             return AVERROR(ENOMEM);

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

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

  848.                st->codec->block_align);

  849.     }

  850.     rm->audio_pkt_cnt--;

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

  852.         ast->audiotimestamp = AV_NOPTS_VALUE;

  853.         pkt->flags = AV_PKT_FLAG_KEY;

  854.     } else

  855.         pkt->flags = 0;

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

  857. 

  858.     return rm->audio_pkt_cnt;

  859. }

  860. 

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

  862. {

  863.     RMDemuxContext *rm = s->priv_data;

  864.     AVStream *st;

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

  866.     int64_t timestamp, pos;

  867.     int flags;

  868. 

  869.     for (;;) {

  870.         if (rm->audio_pkt_cnt) {

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

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

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

  874.             if(res < 0)

  875.                 return res;

  876.             flags = 0;

  877.         } else {

  878.             if (rm->old_format) {

  879.                 RMStream *ast;

  880. 

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

  882.                 ast = st->priv_data;

  883.                 timestamp = AV_NOPTS_VALUE;

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

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

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

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

  888.             } else {

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

  890.                 if (len > 0)

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

  892.             }

  893. 

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

  895.                 return AVERROR(EIO);

  896. 

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

  898.                                       &seq, flags, timestamp);

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

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

  901.             if (res)

  902.                 continue;

  903.         }

  904. 

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

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

  907.             av_free_packet(pkt);

  908.         } else

  909.             break;

  910.     }

  911. 

  912.     return 0;

  913. }

  914. 

  915. static int rm_read_close(AVFormatContext *s)

  916. {

  917.     int i;

  918. 

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

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

  921. 

  922.     return 0;

  923. }

  924. 

  925. static int rm_probe(AVProbeData *p)

  926. {

  927.     /* check file header */

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

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

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

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

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

  933.         return AVPROBE_SCORE_MAX;

  934.     else

  935.         return 0;

  936. }

  937. 

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

  939.                                int64_t *ppos, int64_t pos_limit)

  940. {

  941.     RMDemuxContext *rm = s->priv_data;

  942.     int64_t pos, dts;

  943.     int stream_index2, flags, len, h;

  944. 

  945.     pos = *ppos;

  946. 

  947.     if(rm->old_format)

  948.         return AV_NOPTS_VALUE;

  949. 

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

  951.         return AV_NOPTS_VALUE;

  952. 

  953.     rm->remaining_len=0;

  954.     for(;;){

  955.         int seq=1;

  956.         AVStream *st;

  957. 

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

  959.         if(len<0)

  960.             return AV_NOPTS_VALUE;

  961. 

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

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

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

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

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

  967.             }

  968.         }

  969. 

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

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

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

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

  974.             if(stream_index2 == stream_index)

  975.                 break;

  976.         }

  977. 

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

  979.     }

  980.     *ppos = pos;

  981.     return dts;

  982. }

  983. 

  984. AVInputFormat ff_rm_demuxer = {

  985.     .name           = "rm",

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

  987.     .priv_data_size = sizeof(RMDemuxContext),

  988.     .read_probe     = rm_probe,

  989.     .read_header    = rm_read_header,

  990.     .read_packet    = rm_read_packet,

  991.     .read_close     = rm_read_close,

  992.     .read_timestamp = rm_read_dts,

  993. };

  994. 

  995. AVInputFormat ff_rdt_demuxer = {

  996.     .name           = "rdt",

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

  998.     .priv_data_size = sizeof(RMDemuxContext),

  999.     .read_close     = rm_read_close,

  1000.     .flags          = AVFMT_NOFILE,

  1001. };