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FFmpeg/libavformat/rmdec.c

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  1. /*

  2.  * "Real" compatible demuxer.

  3.  * Copyright (c) 2000, 2001 Fabrice Bellard

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

  7.  * FFmpeg is free software; you can redistribute it and/or

  8.  * modify it under the terms of the GNU Lesser General Public

  9.  * License as published by the Free Software Foundation; either

  10.  * version 2.1 of the License, or (at your option) any later version.

  11.  *

  12.  * FFmpeg is distributed in the hope that it will be useful,

  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  15.  * Lesser General Public License for more details.

  16.  *

  17.  * You should have received a copy of the GNU Lesser General Public

  18.  * License along with FFmpeg; if not, write to the Free Software

  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  20.  */

  21. 

  22. #include "libavutil/avstring.h"

  23. #include "libavutil/intreadwrite.h"

  24. #include "libavutil/dict.h"

  25. #include "avformat.h"

  26. #include "internal.h"

  27. #include "avio_internal.h"

  28. #include "riff.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 const unsigned char sipr_swaps[38][2] = {

  64.     {  0, 63 }, {  1, 22 }, {  2, 44 }, {  3, 90 },

  65.     {  5, 81 }, {  7, 31 }, {  8, 86 }, {  9, 58 },

  66.     { 10, 36 }, { 12, 68 }, { 13, 39 }, { 14, 73 },

  67.     { 15, 53 }, { 16, 69 }, { 17, 57 }, { 19, 88 },

  68.     { 20, 34 }, { 21, 71 }, { 24, 46 }, { 25, 94 },

  69.     { 26, 54 }, { 28, 75 }, { 29, 50 }, { 32, 70 },

  70.     { 33, 92 }, { 35, 74 }, { 38, 85 }, { 40, 56 },

  71.     { 42, 87 }, { 43, 65 }, { 45, 59 }, { 48, 79 },

  72.     { 49, 93 }, { 51, 89 }, { 55, 95 }, { 61, 76 },

  73.     { 67, 83 }, { 77, 80 }

  74. };

  75. 

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

  77. 

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

  79. {

  80.     int i;

  81.     char *q, r;

  82. 

  83.     q = buf;

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

  85.         r = avio_r8(pb);

  86.         if (i < buf_size - 1)

  87.             *q++ = r;

  88.     }

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

  90. }

  91. 

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

  93. {

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

  95. }

  96. 

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

  98. {

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

  100.         return -1;

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

  102.     if (!avctx->extradata)

  103.         return AVERROR(ENOMEM);

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

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

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

  107.         return AVERROR(EIO);

  108.     return 0;

  109. }

  110. 

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

  112. {

  113.     char buf[1024];

  114.     int i;

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

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

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

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

  119.     }

  120. }

  121. 

  122. RMStream *ff_rm_alloc_rmstream (void)

  123. {

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

  125.     rms->curpic_num = -1;

  126.     return rms;

  127. }

  128. 

  129. void ff_rm_free_rmstream (RMStream *rms)

  130. {

  131.     av_free_packet(&rms->pkt);

  132. }

  133. 

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

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

  136. {

  137.     char buf[256];

  138.     uint32_t version;

  139.     int ret;

  140. 

  141.     /* ra type header */

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

  143.     if (version == 3) {

  144.         int header_size = avio_rb16(pb);

  145.         int64_t startpos = avio_tell(pb);

  146.         avio_skip(pb, 14);

  147.         rm_read_metadata(s, 0);

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

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

  150.             avio_r8(pb);

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

  152.         }

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

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

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

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

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

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

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

  160.         ast->deint_id = DEINT_ID_INT0;

  161.     } else {

  162.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  163.         int codecdata_length;

  164.         /* old version (4) */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  179.         if (version == 5) {

  180.             avio_rb16(pb); avio_rb16(pb); avio_rb16(pb);

  181.         }

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

  183.         avio_rb32(pb);

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

  185.         if (version == 5) {

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

  187.             avio_read(pb, buf, 4);

  188.             buf[4] = 0;

  189.         } else {

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

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

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

  193.         }

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

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

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

  197.                                                 st->codec->codec_tag);

  198. 

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

  200.         case CODEC_ID_AC3:

  201.             st->need_parsing = AVSTREAM_PARSE_FULL;

  202.             break;

  203.         case CODEC_ID_RA_288:

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

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

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

  207.             break;

  208.         case CODEC_ID_COOK:

  209.         case CODEC_ID_ATRAC3:

  210.         case CODEC_ID_SIPR:

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

  212.             if (version == 5)

  213.                 avio_r8(pb);

  214.             codecdata_length = avio_rb32(pb);

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

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

  217.                 return -1;

  218.             }

  219. 

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

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

  222.                 if (flavor > 3) {

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

  224.                            flavor);

  225.                     return -1;

  226.                 }

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

  228.             } else {

  229.                 if(sub_packet_size <= 0){

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

  231.                     return -1;

  232.                 }

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

  234.             }

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

  236.                 return ret;

  237. 

  238.             break;

  239.         case CODEC_ID_AAC:

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

  241.             if (version == 5)

  242.                 avio_r8(pb);

  243.             codecdata_length = avio_rb32(pb);

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

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

  246.                 return -1;

  247.             }

  248.             if (codecdata_length >= 1) {

  249.                 avio_r8(pb);

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

  251.                     return ret;

  252.             }

  253.             break;

  254.         default:

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

  256.         }

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

  258.             ast->deint_id == DEINT_ID_GENR ||

  259.             ast->deint_id == DEINT_ID_SIPR) {

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

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

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

  263.                 return AVERROR_INVALIDDATA;

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

  265.                 return AVERROR(ENOMEM);

  266.         }

  267.         switch (ast->deint_id) {

  268.         case DEINT_ID_INT4:

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

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

  271.                 return AVERROR_INVALIDDATA;

  272.             break;

  273.         case DEINT_ID_GENR:

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

  275.                 ast->sub_packet_size > ast->audio_framesize)

  276.                 return AVERROR_INVALIDDATA;

  277.             break;

  278.         case DEINT_ID_SIPR:

  279.         case DEINT_ID_INT0:

  280.         case DEINT_ID_VBRS:

  281.         case DEINT_ID_VBRF:

  282.             break;

  283.         default:

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

  285.             return AVERROR_INVALIDDATA;

  286.         }

  287. 

  288.         if (read_all) {

  289.             avio_r8(pb);

  290.             avio_r8(pb);

  291.             avio_r8(pb);

  292.             rm_read_metadata(s, 0);

  293.         }

  294.     }

  295.     return 0;

  296. }

  297. 

  298. int

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

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

  301. {

  302.     unsigned int v;

  303.     int size;

  304.     int64_t codec_pos;

  305.     int ret;

  306. 

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

  308.     codec_pos = avio_tell(pb);

  309.     v = avio_rb32(pb);

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

  311.         /* ra type header */

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

  313.             return -1;

  314.     } else {

  315.         int fps;

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

  317.         fail1:

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

  319.             goto skip;

  320.         }

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

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

  323.                                                st->codec->codec_tag);

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

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

  326.             goto fail1;

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

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

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

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

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

  332.         st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  333.         fps = avio_rb32(pb);

  334. 

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

  336.             return ret;

  337. 

  338.         av_reduce(&st->r_frame_rate.den, &st->r_frame_rate.num,

  339.                   0x10000, fps, (1 << 30) - 1);

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

  341.     }

  342. 

  343. skip:

  344.     /* skip codec info */

  345.     size = avio_tell(pb) - codec_pos;

  346.     avio_skip(pb, codec_data_size - size);

  347. 

  348.     return 0;

  349. }

  350. 

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

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

  353. static int rm_read_index(AVFormatContext *s)

  354. {

  355.     AVIOContext *pb = s->pb;

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

  357.     AVStream *st;

  358. 

  359.     do {

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

  361.             return -1;

  362.         size     = avio_rb32(pb);

  363.         if (size < 20)

  364.             return -1;

  365.         avio_skip(pb, 2);

  366.         n_pkts   = avio_rb32(pb);

  367.         str_id   = avio_rb16(pb);

  368.         next_off = avio_rb32(pb);

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

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

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

  372.                 break;

  373.             }

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

  375.             goto skip;

  376. 

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

  378.             avio_skip(pb, 2);

  379.             pts = avio_rb32(pb);

  380.             pos = avio_rb32(pb);

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

  382. 

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

  384.         }

  385. 

  386. skip:

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

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

  389.             return -1;

  390.     } while (next_off);

  391. 

  392.     return 0;

  393. }

  394. 

  395. static int rm_read_header_old(AVFormatContext *s)

  396. {

  397.     RMDemuxContext *rm = s->priv_data;

  398.     AVStream *st;

  399. 

  400.     rm->old_format = 1;

  401.     st = avformat_new_stream(s, NULL);

  402.     if (!st)

  403.         return -1;

  404.     st->priv_data = ff_rm_alloc_rmstream();

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

  406. }

  407. 

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

  409. {

  410.     RMDemuxContext *rm = s->priv_data;

  411.     AVStream *st;

  412.     AVIOContext *pb = s->pb;

  413.     unsigned int tag;

  414.     int tag_size;

  415.     unsigned int start_time, duration;

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

  417.     char buf[128];

  418.     int flags = 0;

  419. 

  420.     tag = avio_rl32(pb);

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

  422.         /* very old .ra format */

  423.         return rm_read_header_old(s);

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

  425.         return AVERROR(EIO);

  426.     }

  427. 

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

  429.     avio_rb16(pb);

  430.     avio_rb32(pb);

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

  432. 

  433.     for(;;) {

  434.         if (url_feof(pb))

  435.             return -1;

  436.         tag = avio_rl32(pb);

  437.         tag_size = avio_rb32(pb);

  438.         avio_rb16(pb);

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

  440.                 (tag      ) & 0xff,

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

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

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

  444.                 tag,

  445.                 tag_size);

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

  447.             return -1;

  448.         switch(tag) {

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

  450.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

  462.             break;

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

  464.             rm_read_metadata(s, 1);

  465.             break;

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

  467.             st = avformat_new_stream(s, NULL);

  468.             if (!st)

  469.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  478.             st->start_time = start_time;

  479.             st->duration = duration;

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

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

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

  483.             st->priv_data = ff_rm_alloc_rmstream();

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

  485.                                           avio_rb32(pb)) < 0)

  486.                 return -1;

  487.             break;

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

  489.             goto header_end;

  490.         default:

  491.             /* unknown tag: skip it */

  492.             avio_skip(pb, tag_size - 10);

  493.             break;

  494.         }

  495.     }

  496.  header_end:

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

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

  499.         rm->nb_packets = 3600 * 25;

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

  501. 

  502.     if (!data_off)

  503.         data_off = avio_tell(pb) - 18;

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

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

  506.         rm_read_index(s);

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

  508.     }

  509. 

  510.     return 0;

  511. }

  512. 

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

  514. {

  515.     int n, n1;

  516. 

  517.     n = avio_rb16(pb);

  518.     (*len)-=2;

  519.     n &= 0x7FFF;

  520.     if (n >= 0x4000) {

  521.         return n - 0x4000;

  522.     } else {

  523.         n1 = avio_rb16(pb);

  524.         (*len)-=2;

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

  526.     }

  527. }

  528. 

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

  530. #define RAW_PACKET_SIZE 1000

  531. 

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

  533.     RMDemuxContext *rm = s->priv_data;

  534.     AVIOContext *pb = s->pb;

  535.     AVStream *st;

  536.     uint32_t state=0xFFFFFFFF;

  537. 

  538.     while(!url_feof(pb)){

  539.         int len, num, i;

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

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

  542.             num= rm->current_stream;

  543.             len= rm->remaining_len;

  544.             *timestamp = AV_NOPTS_VALUE;

  545.             *flags= 0;

  546.         }else{

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

  548. 

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

  550.                 int n_pkts, expected_len;

  551.                 len = avio_rb32(pb);

  552.                 avio_skip(pb, 2);

  553.                 n_pkts = avio_rb32(pb);

  554.                 expected_len = 20 + n_pkts * 14;

  555.                 if (len == 20)

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

  557.                     len = expected_len;

  558.                 else if (len != expected_len)

  559.                     av_log(s, AV_LOG_WARNING,

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

  561.                            len, n_pkts, expected_len);

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

  563.                 if(len<0)

  564.                     continue;

  565.                 goto skip;

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

  567.                 av_log(s, AV_LOG_WARNING,

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

  569.             }

  570. 

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

  572.                 continue;

  573.             len=state - 12;

  574.             state= 0xFFFFFFFF;

  575. 

  576.             num = avio_rb16(pb);

  577.             *timestamp = avio_rb32(pb);

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

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

  580.         }

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

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

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

  584.                 break;

  585.         }

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

  587. skip:

  588.             /* skip packet if unknown number */

  589.             avio_skip(pb, len);

  590.             rm->remaining_len = 0;

  591.             continue;

  592.         }

  593.         *stream_index= i;

  594. 

  595.         return len;

  596.     }

  597.     return -1;

  598. }

  599. 

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

  601.                                    RMDemuxContext *rm, RMStream *vst,

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

  603.                                    int64_t *timestamp)

  604. {

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

  606.     int type;

  607. 

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

  609.     type = hdr >> 6;

  610. 

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

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

  613.     }

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

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

  616.         len2 = ffio_limit(pb, len2);

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

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

  619.     }

  620.     if(len<0)

  621.         return -1;

  622.     rm->remaining_len = len;

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

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

  625.             len= len2;

  626.             *timestamp = pos;

  627.         }

  628.         if(rm->remaining_len < len)

  629.             return -1;

  630.         rm->remaining_len -= len;

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

  632.             return AVERROR(EIO);

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

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

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

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

  637.         return 0;

  638.     }

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

  640. 

  641.     *pseq = seq;

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

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

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

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

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

  647.             return AVERROR(ENOMEM);

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

  649.         vst->cur_slice = 0;

  650.         vst->curpic_num = pic_num;

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

  652.     }

  653.     if(type == 2)

  654.         len = FFMIN(len, pos);

  655. 

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

  657.         return 1;

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

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

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

  661.         return 1;

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

  663.         return AVERROR(EIO);

  664.     vst->videobufpos += len;

  665.     rm->remaining_len-= len;

  666. 

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

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

  669.         *pkt= vst->pkt;

  670.         vst->pkt.data= NULL;

  671.         vst->pkt.size= 0;

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

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

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

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

  676.         pkt->pts = AV_NOPTS_VALUE;

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

  678.         vst->slices = 0;

  679.         return 0;

  680.     }

  681. 

  682.     return 1;

  683. }

  684. 

  685. static inline void

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

  687. {

  688.     uint8_t *ptr;

  689.     int j;

  690. 

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

  692.         ptr = pkt->data;

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

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

  695.             ptr += 2;

  696.         }

  697.     }

  698. }

  699. 

  700. /**

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

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

  703.  */

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

  705. {

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

  707. 

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

  709.         int j;

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

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

  712. 

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

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

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

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

  717. 

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

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

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

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

  722.         }

  723.     }

  724. }

  725. 

  726. int

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

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

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

  730. {

  731.     RMDemuxContext *rm = s->priv_data;

  732. 

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

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

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

  736.             return -1; //got partial frame

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

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

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

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

  741.             int x;

  742.             int sps = ast->sub_packet_size;

  743.             int cfs = ast->coded_framesize;

  744.             int h = ast->sub_packet_h;

  745.             int y = ast->sub_packet_cnt;

  746.             int w = ast->audio_framesize;

  747. 

  748.             if (flags & 2)

  749.                 y = ast->sub_packet_cnt = 0;

  750.             if (!y)

  751.                 ast->audiotimestamp = timestamp;

  752. 

  753.             switch (ast->deint_id) {

  754.                 case DEINT_ID_INT4:

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

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

  757.                     break;

  758.                 case DEINT_ID_GENR:

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

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

  761.                     break;

  762.                 case DEINT_ID_SIPR:

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

  764.                     break;

  765.             }

  766. 

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

  768.                 return -1;

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

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

  771. 

  772.              ast->sub_packet_cnt = 0;

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

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

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

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

  777.             int x;

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

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

  780.             if (ast->sub_packet_cnt) {

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

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

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

  784.                 ast->audiotimestamp = timestamp;

  785.             } else

  786.                 return -1;

  787.         } else {

  788.             av_get_packet(pb, pkt, len);

  789.             rm_ac3_swap_bytes(st, pkt);

  790.         }

  791.     } else

  792.         av_get_packet(pb, pkt, len);

  793. 

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

  795. 

  796. #if 0

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

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

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

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

  801. 

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

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

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

  805.         }

  806.     }

  807. #endif

  808. 

  809.     pkt->pts = timestamp;

  810.     if (flags & 2)

  811.         pkt->flags |= AV_PKT_FLAG_KEY;

  812. 

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

  814. }

  815. 

  816. int

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

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

  819. {

  820.     RMDemuxContext *rm = s->priv_data;

  821. 

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

  823. 

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

  825.         ast->deint_id == DEINT_ID_VBRS)

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

  827.     else {

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

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

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

  831.                st->codec->block_align);

  832.     }

  833.     rm->audio_pkt_cnt--;

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

  835.         ast->audiotimestamp = AV_NOPTS_VALUE;

  836.         pkt->flags = AV_PKT_FLAG_KEY;

  837.     } else

  838.         pkt->flags = 0;

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

  840. 

  841.     return rm->audio_pkt_cnt;

  842. }

  843. 

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

  845. {

  846.     RMDemuxContext *rm = s->priv_data;

  847.     AVStream *st;

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

  849.     int64_t timestamp, pos;

  850.     int flags;

  851. 

  852.     for (;;) {

  853.         if (rm->audio_pkt_cnt) {

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

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

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

  857.             flags = 0;

  858.         } else {

  859.             if (rm->old_format) {

  860.                 RMStream *ast;

  861. 

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

  863.                 ast = st->priv_data;

  864.                 timestamp = AV_NOPTS_VALUE;

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

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

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

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

  869.             } else {

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

  871.                 if (len > 0)

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

  873.             }

  874. 

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

  876.                 return AVERROR(EIO);

  877. 

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

  879.                                       &seq, flags, timestamp);

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

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

  882.             if (res)

  883.                 continue;

  884.         }

  885. 

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

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

  888.             av_free_packet(pkt);

  889.         } else

  890.             break;

  891.     }

  892. 

  893.     return 0;

  894. }

  895. 

  896. static int rm_read_close(AVFormatContext *s)

  897. {

  898.     int i;

  899. 

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

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

  902. 

  903.     return 0;

  904. }

  905. 

  906. static int rm_probe(AVProbeData *p)

  907. {

  908.     /* check file header */

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

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

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

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

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

  914.         return AVPROBE_SCORE_MAX;

  915.     else

  916.         return 0;

  917. }

  918. 

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

  920.                                int64_t *ppos, int64_t pos_limit)

  921. {

  922.     RMDemuxContext *rm = s->priv_data;

  923.     int64_t pos, dts;

  924.     int stream_index2, flags, len, h;

  925. 

  926.     pos = *ppos;

  927. 

  928.     if(rm->old_format)

  929.         return AV_NOPTS_VALUE;

  930. 

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

  932.         return AV_NOPTS_VALUE;

  933. 

  934.     rm->remaining_len=0;

  935.     for(;;){

  936.         int seq=1;

  937.         AVStream *st;

  938. 

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

  940.         if(len<0)

  941.             return AV_NOPTS_VALUE;

  942. 

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

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

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

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

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

  948.             }

  949.         }

  950. 

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

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

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

  954.             if(stream_index2 == stream_index)

  955.                 break;

  956.         }

  957. 

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

  959.     }

  960.     *ppos = pos;

  961.     return dts;

  962. }

  963. 

  964. AVInputFormat ff_rm_demuxer = {

  965.     .name           = "rm",

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

  967.     .priv_data_size = sizeof(RMDemuxContext),

  968.     .read_probe     = rm_probe,

  969.     .read_header    = rm_read_header,

  970.     .read_packet    = rm_read_packet,

  971.     .read_close     = rm_read_close,

  972.     .read_timestamp = rm_read_dts,

  973. };

  974. 

  975. AVInputFormat ff_rdt_demuxer = {

  976.     .name           = "rdt",

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

  978.     .priv_data_size = sizeof(RMDemuxContext),

  979.     .read_close     = rm_read_close,

  980.     .flags          = AVFMT_NOFILE,

  981. };