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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 "avformat.h"

  25. #include "riff.h"

  26. #include "rm.h"

  27. 

  28. struct RMStream {

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

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

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

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

  33.     int cur_slice, slices;

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

  35.     /// Audio descrambling matrix parameters

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

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

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

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

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

  41. };

  42. 

  43. typedef struct {

  44.     int nb_packets;

  45.     int old_format;

  46.     int current_stream;

  47.     int remaining_len;

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

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

  50. } RMDemuxContext;

  51. 

  52. static const AVCodecTag rm_codec_tags[] = {

  53.     { CODEC_ID_RV10,   MKTAG('R','V','1','0') },

  54.     { CODEC_ID_RV20,   MKTAG('R','V','2','0') },

  55.     { CODEC_ID_RV20,   MKTAG('R','V','T','R') },

  56.     { CODEC_ID_RV30,   MKTAG('R','V','3','0') },

  57.     { CODEC_ID_RV40,   MKTAG('R','V','4','0') },

  58.     { CODEC_ID_AC3,    MKTAG('d','n','e','t') },

  59.     { CODEC_ID_RA_144, MKTAG('l','p','c','J') },

  60.     { CODEC_ID_RA_288, MKTAG('2','8','_','8') },

  61.     { CODEC_ID_COOK,   MKTAG('c','o','o','k') },

  62.     { CODEC_ID_ATRAC3, MKTAG('a','t','r','c') },

  63.     { CODEC_ID_SIPR,   MKTAG('s','i','p','r') },

  64.     { CODEC_ID_AAC,    MKTAG('r','a','a','c') },

  65.     { CODEC_ID_AAC,    MKTAG('r','a','c','p') },

  66.     { CODEC_ID_NONE },

  67. };

  68. 

  69. static const unsigned char sipr_swaps[38][2] = {

  70.     {  0, 63 }, {  1, 22 }, {  2, 44 }, {  3, 90 },

  71.     {  5, 81 }, {  7, 31 }, {  8, 86 }, {  9, 58 },

  72.     { 10, 36 }, { 12, 68 }, { 13, 39 }, { 14, 73 },

  73.     { 15, 53 }, { 16, 69 }, { 17, 57 }, { 19, 88 },

  74.     { 20, 34 }, { 21, 71 }, { 24, 46 }, { 25, 94 },

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

  76.     { 33, 92 }, { 35, 74 }, { 38, 85 }, { 40, 56 },

  77.     { 42, 87 }, { 43, 65 }, { 45, 59 }, { 48, 79 },

  78.     { 49, 93 }, { 51, 89 }, { 55, 95 }, { 61, 76 },

  79.     { 67, 83 }, { 77, 80 }

  80. };

  81. 

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

  83. 

  84. static inline void get_strl(ByteIOContext *pb, char *buf, int buf_size, int len)

  85. {

  86.     int i;

  87.     char *q, r;

  88. 

  89.     q = buf;

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

  91.         r = get_byte(pb);

  92.         if (i < buf_size - 1)

  93.             *q++ = r;

  94.     }

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

  96. }

  97. 

  98. static void get_str8(ByteIOContext *pb, char *buf, int buf_size)

  99. {

  100.     get_strl(pb, buf, buf_size, get_byte(pb));

  101. }

  102. 

  103. static int rm_read_extradata(ByteIOContext *pb, AVCodecContext *avctx, unsigned size)

  104. {

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

  106.         return -1;

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

  108.     if (!avctx->extradata)

  109.         return AVERROR(ENOMEM);

  110.     avctx->extradata_size = get_buffer(pb, avctx->extradata, size);

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

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

  113.         return AVERROR(EIO);

  114.     return 0;

  115. }

  116. 

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

  118. {

  119.     char buf[1024];

  120.     int i;

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

  122.         int len = wide ? get_be16(s->pb) : get_byte(s->pb);

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

  124.         av_metadata_set2(&s->metadata, ff_rm_metadata[i], buf, 0);

  125.     }

  126. }

  127. 

  128. RMStream *ff_rm_alloc_rmstream (void)

  129. {

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

  131.     rms->curpic_num = -1;

  132.     return rms;

  133. }

  134. 

  135. void ff_rm_free_rmstream (RMStream *rms)

  136. {

  137.     av_free_packet(&rms->pkt);

  138. }

  139. 

  140. static int rm_read_audio_stream_info(AVFormatContext *s, ByteIOContext *pb,

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

  142. {

  143.     char buf[256];

  144.     uint32_t version;

  145.     int ret;

  146. 

  147.     /* ra type header */

  148.     version = get_be16(pb); /* version */

  149.     if (version == 3) {

  150.         int header_size = get_be16(pb);

  151.         int64_t startpos = url_ftell(pb);

  152.         url_fskip(pb, 14);

  153.         rm_read_metadata(s, 0);

  154.         if ((startpos + header_size) >= url_ftell(pb) + 2) {

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

  156.             get_byte(pb);

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

  158.         }

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

  160.         if ((startpos + header_size) > url_ftell(pb))

  161.             url_fskip(pb, header_size + startpos - url_ftell(pb));

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

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

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

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

  166.     } else {

  167.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  168.         int codecdata_length;

  169.         /* old version (4) */

  170.         url_fskip(pb, 2); /* unused */

  171.         get_be32(pb); /* .ra4 */

  172.         get_be32(pb); /* data size */

  173.         get_be16(pb); /* version2 */

  174.         get_be32(pb); /* header size */

  175.         flavor= get_be16(pb); /* add codec info / flavor */

  176.         ast->coded_framesize = coded_framesize = get_be32(pb); /* coded frame size */

  177.         get_be32(pb); /* ??? */

  178.         get_be32(pb); /* ??? */

  179.         get_be32(pb); /* ??? */

  180.         ast->sub_packet_h = sub_packet_h = get_be16(pb); /* 1 */

  181.         st->codec->block_align= get_be16(pb); /* frame size */

  182.         ast->sub_packet_size = sub_packet_size = get_be16(pb); /* sub packet size */

  183.         get_be16(pb); /* ??? */

  184.         if (version == 5) {

  185.             get_be16(pb); get_be16(pb); get_be16(pb);

  186.         }

  187.         st->codec->sample_rate = get_be16(pb);

  188.         get_be32(pb);

  189.         st->codec->channels = get_be16(pb);

  190.         if (version == 5) {

  191.             get_be32(pb);

  192.             get_buffer(pb, buf, 4);

  193.             buf[4] = 0;

  194.         } else {

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

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

  197.         }

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

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

  200.         st->codec->codec_id   = ff_codec_get_id(rm_codec_tags, st->codec->codec_tag);

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

  202.         case CODEC_ID_AC3:

  203.             st->need_parsing = AVSTREAM_PARSE_FULL;

  204.             break;

  205.         case CODEC_ID_RA_288:

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

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

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

  209. 

  210.             if(ast->audio_framesize >= UINT_MAX / sub_packet_h){

  211.                 av_log(s, AV_LOG_ERROR, "ast->audio_framesize * sub_packet_h too large\n");

  212.                 return -1;

  213.             }

  214. 

  215.             av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h);

  216.             break;

  217.         case CODEC_ID_COOK:

  218.         case CODEC_ID_ATRAC3:

  219.         case CODEC_ID_SIPR:

  220.             get_be16(pb); get_byte(pb);

  221.             if (version == 5)

  222.                 get_byte(pb);

  223.             codecdata_length = get_be32(pb);

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

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

  226.                 return -1;

  227.             }

  228. 

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

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

  231.                 if (flavor > 3) {

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

  233.                            flavor);

  234.                     return -1;

  235.                 }

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

  237.             } else {

  238.                 if(sub_packet_size <= 0){

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

  240.                     return -1;

  241.                 }

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

  243.             }

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

  245.                 return ret;

  246. 

  247.             if(ast->audio_framesize >= UINT_MAX / sub_packet_h){

  248.                 av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");

  249.                 return -1;

  250.             }

  251. 

  252.             av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h);

  253.             break;

  254.         case CODEC_ID_AAC:

  255.             get_be16(pb); get_byte(pb);

  256.             if (version == 5)

  257.                 get_byte(pb);

  258.             codecdata_length = get_be32(pb);

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

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

  261.                 return -1;

  262.             }

  263.             if (codecdata_length >= 1) {

  264.                 get_byte(pb);

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

  266.                     return ret;

  267.             }

  268.             break;

  269.         default:

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

  271.         }

  272.         if (read_all) {

  273.             get_byte(pb);

  274.             get_byte(pb);

  275.             get_byte(pb);

  276.             rm_read_metadata(s, 0);

  277.         }

  278.     }

  279.     return 0;

  280. }

  281. 

  282. int

  283. ff_rm_read_mdpr_codecdata (AVFormatContext *s, ByteIOContext *pb,

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

  285. {

  286.     unsigned int v;

  287.     int size;

  288.     int64_t codec_pos;

  289.     int ret;

  290. 

  291.     av_set_pts_info(st, 64, 1, 1000);

  292.     codec_pos = url_ftell(pb);

  293.     v = get_be32(pb);

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

  295.         /* ra type header */

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

  297.             return -1;

  298.     } else {

  299.         int fps, fps2;

  300.         if (get_le32(pb) != MKTAG('V', 'I', 'D', 'O')) {

  301.         fail1:

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

  303.             goto skip;

  304.         }

  305.         st->codec->codec_tag = get_le32(pb);

  306.         st->codec->codec_id  = ff_codec_get_id(rm_codec_tags, st->codec->codec_tag);

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

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

  309.             goto fail1;

  310.         st->codec->width = get_be16(pb);

  311.         st->codec->height = get_be16(pb);

  312.         st->codec->time_base.num= 1;

  313.         fps= get_be16(pb);

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

  315.         get_be32(pb);

  316.         fps2= get_be16(pb);

  317.         get_be16(pb);

  318. 

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

  320.             return ret;

  321. 

  322. //        av_log(s, AV_LOG_DEBUG, "fps= %d fps2= %d\n", fps, fps2);

  323.         st->codec->time_base.den = fps * st->codec->time_base.num;

  324.         //XXX: do we really need that?

  325.         switch(st->codec->extradata[4]>>4){

  326.         case 1: st->codec->codec_id = CODEC_ID_RV10; break;

  327.         case 2: st->codec->codec_id = CODEC_ID_RV20; break;

  328.         case 3: st->codec->codec_id = CODEC_ID_RV30; break;

  329.         case 4: st->codec->codec_id = CODEC_ID_RV40; break;

  330.         default:

  331.             av_log(st->codec, AV_LOG_ERROR, "extra:%02X %02X %02X %02X %02X\n", st->codec->extradata[0], st->codec->extradata[1], st->codec->extradata[2], st->codec->extradata[3], st->codec->extradata[4]);

  332.             goto fail1;

  333.         }

  334.     }

  335. 

  336. skip:

  337.     /* skip codec info */

  338.     size = url_ftell(pb) - codec_pos;

  339.     url_fskip(pb, codec_data_size - size);

  340. 

  341.     return 0;

  342. }

  343. 

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

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

  346. static int rm_read_index(AVFormatContext *s)

  347. {

  348.     ByteIOContext *pb = s->pb;

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

  350.     AVStream *st;

  351. 

  352.     do {

  353.         if (get_le32(pb) != MKTAG('I','N','D','X'))

  354.             return -1;

  355.         size     = get_be32(pb);

  356.         if (size < 20)

  357.             return -1;

  358.         url_fskip(pb, 2);

  359.         n_pkts   = get_be32(pb);

  360.         str_id   = get_be16(pb);

  361.         next_off = get_be32(pb);

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

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

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

  365.                 break;

  366.             }

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

  368.             goto skip;

  369. 

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

  371.             url_fskip(pb, 2);

  372.             pts = get_be32(pb);

  373.             pos = get_be32(pb);

  374.             url_fskip(pb, 4); /* packet no. */

  375. 

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

  377.         }

  378. 

  379. skip:

  380.         if (next_off && url_ftell(pb) != next_off &&

  381.             url_fseek(pb, next_off, SEEK_SET) < 0)

  382.             return -1;

  383.     } while (next_off);

  384. 

  385.     return 0;

  386. }

  387. 

  388. static int rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap)

  389. {

  390.     RMDemuxContext *rm = s->priv_data;

  391.     AVStream *st;

  392. 

  393.     rm->old_format = 1;

  394.     st = av_new_stream(s, 0);

  395.     if (!st)

  396.         return -1;

  397.     st->priv_data = ff_rm_alloc_rmstream();

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

  399. }

  400. 

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

  402. {

  403.     RMDemuxContext *rm = s->priv_data;

  404.     AVStream *st;

  405.     ByteIOContext *pb = s->pb;

  406.     unsigned int tag;

  407.     int tag_size;

  408.     unsigned int start_time, duration;

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

  410.     char buf[128];

  411.     int flags = 0;

  412. 

  413.     tag = get_le32(pb);

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

  415.         /* very old .ra format */

  416.         return rm_read_header_old(s, ap);

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

  418.         return AVERROR(EIO);

  419.     }

  420. 

  421.     get_be32(pb); /* header size */

  422.     get_be16(pb);

  423.     get_be32(pb);

  424.     get_be32(pb); /* number of headers */

  425. 

  426.     for(;;) {

  427.         if (url_feof(pb))

  428.             return -1;

  429.         tag = get_le32(pb);

  430.         tag_size = get_be32(pb);

  431.         get_be16(pb);

  432. #if 0

  433.         printf("tag=%c%c%c%c (%08x) size=%d\n",

  434.                (tag) & 0xff,

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

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

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

  438.                tag,

  439.                tag_size);

  440. #endif

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

  442.             return -1;

  443.         switch(tag) {

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

  445.             /* file header */

  446.             get_be32(pb); /* max bit rate */

  447.             get_be32(pb); /* avg bit rate */

  448.             get_be32(pb); /* max packet size */

  449.             get_be32(pb); /* avg packet size */

  450.             get_be32(pb); /* nb packets */

  451.             get_be32(pb); /* duration */

  452.             get_be32(pb); /* preroll */

  453.             indx_off = get_be32(pb); /* index offset */

  454.             data_off = get_be32(pb); /* data offset */

  455.             get_be16(pb); /* nb streams */

  456.             flags = get_be16(pb); /* flags */

  457.             break;

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

  459.             rm_read_metadata(s, 1);

  460.             break;

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

  462.             st = av_new_stream(s, 0);

  463.             if (!st)

  464.                 return AVERROR(ENOMEM);

  465.             st->id = get_be16(pb);

  466.             get_be32(pb); /* max bit rate */

  467.             st->codec->bit_rate = get_be32(pb); /* bit rate */

  468.             get_be32(pb); /* max packet size */

  469.             get_be32(pb); /* avg packet size */

  470.             start_time = get_be32(pb); /* start time */

  471.             get_be32(pb); /* preroll */

  472.             duration = get_be32(pb); /* duration */

  473.             st->start_time = start_time;

  474.             st->duration = duration;

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

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

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

  478.             st->priv_data = ff_rm_alloc_rmstream();

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

  480.                                           get_be32(pb)) < 0)

  481.                 return -1;

  482.             break;

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

  484.             goto header_end;

  485.         default:

  486.             /* unknown tag: skip it */

  487.             url_fskip(pb, tag_size - 10);

  488.             break;

  489.         }

  490.     }

  491.  header_end:

  492.     rm->nb_packets = get_be32(pb); /* number of packets */

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

  494.         rm->nb_packets = 3600 * 25;

  495.     get_be32(pb); /* next data header */

  496. 

  497.     if (!data_off)

  498.         data_off = url_ftell(pb) - 18;

  499.     if (indx_off && url_fseek(pb, indx_off, SEEK_SET) >= 0) {

  500.         rm_read_index(s);

  501.         url_fseek(pb, data_off + 18, SEEK_SET);

  502.     }

  503. 

  504.     return 0;

  505. }

  506. 

  507. static int get_num(ByteIOContext *pb, int *len)

  508. {

  509.     int n, n1;

  510. 

  511.     n = get_be16(pb);

  512.     (*len)-=2;

  513.     n &= 0x7FFF;

  514.     if (n >= 0x4000) {

  515.         return n - 0x4000;

  516.     } else {

  517.         n1 = get_be16(pb);

  518.         (*len)-=2;

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

  520.     }

  521. }

  522. 

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

  524. #define RAW_PACKET_SIZE 1000

  525. 

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

  527.     RMDemuxContext *rm = s->priv_data;

  528.     ByteIOContext *pb = s->pb;

  529.     AVStream *st;

  530.     uint32_t state=0xFFFFFFFF;

  531. 

  532.     while(!url_feof(pb)){

  533.         int len, num, i;

  534.         *pos= url_ftell(pb) - 3;

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

  536.             num= rm->current_stream;

  537.             len= rm->remaining_len;

  538.             *timestamp = AV_NOPTS_VALUE;

  539.             *flags= 0;

  540.         }else{

  541.             state= (state<<8) + get_byte(pb);

  542. 

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

  544.                 int n_pkts, expected_len;

  545.                 len = get_be32(pb);

  546.                 url_fskip(pb, 2);

  547.                 n_pkts = get_be32(pb);

  548.                 expected_len = 20 + n_pkts * 14;

  549.                 if (len == 20)

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

  551.                     len = expected_len;

  552.                 else if (len != expected_len)

  553.                     av_log(s, AV_LOG_WARNING,

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

  555.                            len, n_pkts, expected_len);

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

  557.                 if(len<0)

  558.                     continue;

  559.                 goto skip;

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

  561.                 av_log(s, AV_LOG_WARNING,

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

  563.             }

  564. 

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

  566.                 continue;

  567.             len=state - 12;

  568.             state= 0xFFFFFFFF;

  569. 

  570.             num = get_be16(pb);

  571.             *timestamp = get_be32(pb);

  572.             get_byte(pb); /* reserved */

  573.             *flags = get_byte(pb); /* flags */

  574.         }

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

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

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

  578.                 break;

  579.         }

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

  581. skip:

  582.             /* skip packet if unknown number */

  583.             url_fskip(pb, len);

  584.             rm->remaining_len = 0;

  585.             continue;

  586.         }

  587.         *stream_index= i;

  588. 

  589.         return len;

  590.     }

  591.     return -1;

  592. }

  593. 

  594. static int rm_assemble_video_frame(AVFormatContext *s, ByteIOContext *pb,

  595.                                    RMDemuxContext *rm, RMStream *vst,

  596.                                    AVPacket *pkt, int len, int *pseq)

  597. {

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

  599.     int type;

  600. 

  601.     hdr = get_byte(pb); len--;

  602.     type = hdr >> 6;

  603. 

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

  605.         seq = get_byte(pb); len--;

  606.     }

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

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

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

  610.         pic_num = get_byte(pb); len--;

  611.     }

  612.     if(len<0)

  613.         return -1;

  614.     rm->remaining_len = len;

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

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

  617.             len= len2;

  618.         if(rm->remaining_len < len)

  619.             return -1;

  620.         rm->remaining_len -= len;

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

  622.             return AVERROR(EIO);

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

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

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

  626.         get_buffer(pb, pkt->data + 9, len);

  627.         return 0;

  628.     }

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

  630. 

  631.     *pseq = seq;

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

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

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

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

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

  637.             return AVERROR(ENOMEM);

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

  639.         vst->cur_slice = 0;

  640.         vst->curpic_num = pic_num;

  641.         vst->pktpos = url_ftell(pb);

  642.     }

  643.     if(type == 2)

  644.         len = FFMIN(len, pos);

  645. 

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

  647.         return 1;

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

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

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

  651.         return 1;

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

  653.         return AVERROR(EIO);

  654.     vst->videobufpos += len;

  655.     rm->remaining_len-= len;

  656. 

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

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

  659.         *pkt= vst->pkt;

  660.         vst->pkt.data= NULL;

  661.         vst->pkt.size= 0;

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

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

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

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

  666.         pkt->pts = AV_NOPTS_VALUE;

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

  668.         vst->slices = 0;

  669.         return 0;

  670.     }

  671. 

  672.     return 1;

  673. }

  674. 

  675. static inline void

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

  677. {

  678.     uint8_t *ptr;

  679.     int j;

  680. 

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

  682.         ptr = pkt->data;

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

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

  685.             ptr += 2;

  686.         }

  687.     }

  688. }

  689. 

  690. /**

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

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

  693.  */

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

  695. {

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

  697. 

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

  699.         int j;

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

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

  702. 

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

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

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

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

  707. 

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

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

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

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

  712.         }

  713.     }

  714. }

  715. 

  716. int

  717. ff_rm_parse_packet (AVFormatContext *s, ByteIOContext *pb,

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

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

  720. {

  721.     RMDemuxContext *rm = s->priv_data;

  722. 

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

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

  725.         if(rm_assemble_video_frame(s, pb, rm, ast, pkt, len, seq))

  726.             return -1; //got partial frame

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

  728.         if ((st->codec->codec_id == CODEC_ID_RA_288) ||

  729.             (st->codec->codec_id == CODEC_ID_COOK) ||

  730.             (st->codec->codec_id == CODEC_ID_ATRAC3) ||

  731.             (st->codec->codec_id == CODEC_ID_SIPR)) {

  732.             int x;

  733.             int sps = ast->sub_packet_size;

  734.             int cfs = ast->coded_framesize;

  735.             int h = ast->sub_packet_h;

  736.             int y = ast->sub_packet_cnt;

  737.             int w = ast->audio_framesize;

  738. 

  739.             if (flags & 2)

  740.                 y = ast->sub_packet_cnt = 0;

  741.             if (!y)

  742.                 ast->audiotimestamp = timestamp;

  743. 

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

  745.                 case CODEC_ID_RA_288:

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

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

  748.                     break;

  749.                 case CODEC_ID_ATRAC3:

  750.                 case CODEC_ID_COOK:

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

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

  753.                     break;

  754.                 case CODEC_ID_SIPR:

  755.                     get_buffer(pb, ast->pkt.data + y * w, w);

  756.                     break;

  757.             }

  758. 

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

  760.                 return -1;

  761.             if (st->codec->codec_id == CODEC_ID_SIPR)

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

  763. 

  764.              ast->sub_packet_cnt = 0;

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

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

  767.         } else if (st->codec->codec_id == CODEC_ID_AAC) {

  768.             int x;

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

  770.             ast->sub_packet_cnt = (get_be16(pb) & 0xf0) >> 4;

  771.             if (ast->sub_packet_cnt) {

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

  773.                     ast->sub_packet_lengths[x] = get_be16(pb);

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

  775.                 ast->audiotimestamp = timestamp;

  776.             } else

  777.                 return -1;

  778.         } else {

  779.             av_get_packet(pb, pkt, len);

  780.             rm_ac3_swap_bytes(st, pkt);

  781.         }

  782.     } else

  783.         av_get_packet(pb, pkt, len);

  784. 

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

  786. 

  787. #if 0

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

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

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

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

  792. 

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

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

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

  796.         }

  797.     }

  798. #endif

  799. 

  800.     pkt->pts= timestamp;

  801.     if (flags & 2)

  802.         pkt->flags |= AV_PKT_FLAG_KEY;

  803. 

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

  805. }

  806. 

  807. int

  808. ff_rm_retrieve_cache (AVFormatContext *s, ByteIOContext *pb,

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

  810. {

  811.     RMDemuxContext *rm = s->priv_data;

  812. 

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

  814. 

  815.     if (st->codec->codec_id == CODEC_ID_AAC)

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

  817.     else {

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

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

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

  821.                st->codec->block_align);

  822.     }

  823.     rm->audio_pkt_cnt--;

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

  825.         ast->audiotimestamp = AV_NOPTS_VALUE;

  826.         pkt->flags = AV_PKT_FLAG_KEY;

  827.     } else

  828.         pkt->flags = 0;

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

  830. 

  831.     return rm->audio_pkt_cnt;

  832. }

  833. 

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

  835. {

  836.     RMDemuxContext *rm = s->priv_data;

  837.     AVStream *st;

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

  839.     int64_t timestamp, pos;

  840.     int flags;

  841. 

  842.     for (;;) {

  843.         if (rm->audio_pkt_cnt) {

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

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

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

  847.             flags = 0;

  848.         } else {

  849.             if (rm->old_format) {

  850.                 RMStream *ast;

  851. 

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

  853.                 ast = st->priv_data;

  854.                 timestamp = AV_NOPTS_VALUE;

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

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

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

  858.                 pos = url_ftell(s->pb);

  859.             } else {

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

  861.                 if (len > 0)

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

  863.             }

  864. 

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

  866.                 return AVERROR(EIO);

  867. 

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

  869.                                       &seq, flags, timestamp);

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

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

  872.             if (res)

  873.                 continue;

  874.         }

  875. 

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

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

  878.             av_free_packet(pkt);

  879.         } else

  880.             break;

  881.     }

  882. 

  883.     return 0;

  884. }

  885. 

  886. static int rm_read_close(AVFormatContext *s)

  887. {

  888.     int i;

  889. 

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

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

  892. 

  893.     return 0;

  894. }

  895. 

  896. static int rm_probe(AVProbeData *p)

  897. {

  898.     /* check file header */

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

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

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

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

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

  904.         return AVPROBE_SCORE_MAX;

  905.     else

  906.         return 0;

  907. }

  908. 

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

  910.                                int64_t *ppos, int64_t pos_limit)

  911. {

  912.     RMDemuxContext *rm = s->priv_data;

  913.     int64_t pos, dts;

  914.     int stream_index2, flags, len, h;

  915. 

  916.     pos = *ppos;

  917. 

  918.     if(rm->old_format)

  919.         return AV_NOPTS_VALUE;

  920. 

  921.     url_fseek(s->pb, pos, SEEK_SET);

  922.     rm->remaining_len=0;

  923.     for(;;){

  924.         int seq=1;

  925.         AVStream *st;

  926. 

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

  928.         if(len<0)

  929.             return AV_NOPTS_VALUE;

  930. 

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

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

  933.             h= get_byte(s->pb); len--;

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

  935.                 seq = get_byte(s->pb); len--;

  936.             }

  937.         }

  938. 

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

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

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

  942.             if(stream_index2 == stream_index)

  943.                 break;

  944.         }

  945. 

  946.         url_fskip(s->pb, len);

  947.     }

  948.     *ppos = pos;

  949.     return dts;

  950. }

  951. 

  952. AVInputFormat rm_demuxer = {

  953.     "rm",

  954.     NULL_IF_CONFIG_SMALL("RealMedia format"),

  955.     sizeof(RMDemuxContext),

  956.     rm_probe,

  957.     rm_read_header,

  958.     rm_read_packet,

  959.     rm_read_close,

  960.     NULL,

  961.     rm_read_dts,

  962. };

  963. 

  964. AVInputFormat rdt_demuxer = {

  965.     "rdt",

  966.     NULL_IF_CONFIG_SMALL("RDT demuxer"),

  967.     sizeof(RMDemuxContext),

  968.     NULL,

  969.     NULL,

  970.     NULL,

  971.     rm_read_close,

  972. };