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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 "rm.h"

  26. 

  27. struct RMStream {

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

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

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

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

  32.     int cur_slice, slices;

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

  34.     /// Audio descrambling matrix parameters

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

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

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

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

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

  40. };

  41. 

  42. typedef struct {

  43.     int nb_packets;

  44.     int old_format;

  45.     int current_stream;

  46.     int remaining_len;

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

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

  49. } RMDemuxContext;

  50. 

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

  52. {

  53.     int i;

  54.     char *q, r;

  55. 

  56.     q = buf;

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

  58.         r = get_byte(pb);

  59.         if (i < buf_size - 1)

  60.             *q++ = r;

  61.     }

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

  63. }

  64. 

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

  66. {

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

  68. }

  69. 

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

  71. {

  72.     char buf[1024];

  73.     int i;

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

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

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

  77.         av_metadata_set(&s->metadata, ff_rm_metadata[i], buf);

  78.     }

  79. }

  80. 

  81. RMStream *ff_rm_alloc_rmstream (void)

  82. {

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

  84.     rms->curpic_num = -1;

  85.     return rms;

  86. }

  87. 

  88. void ff_rm_free_rmstream (RMStream *rms)

  89. {

  90.     av_free_packet(&rms->pkt);

  91. }

  92. 

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

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

  95. {

  96.     char buf[256];

  97.     uint32_t version;

  98. 

  99.     /* ra type header */

  100.     version = get_be32(pb); /* version */

  101.     if (((version >> 16) & 0xff) == 3) {

  102.         int64_t startpos = url_ftell(pb);

  103.         url_fskip(pb, 14);

  104.         rm_read_metadata(s, 0);

  105.         if ((startpos + (version & 0xffff)) >= url_ftell(pb) + 2) {

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

  107.             get_byte(pb);

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

  109.         }

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

  111.         if ((startpos + (version & 0xffff)) > url_ftell(pb))

  112.             url_fskip(pb, (version & 0xffff) + startpos - url_ftell(pb));

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

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

  115.         st->codec->codec_type = CODEC_TYPE_AUDIO;

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

  117.     } else {

  118.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  119.         /* old version (4) */

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

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

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

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

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

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

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

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

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

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

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

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

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

  133.         if (((version >> 16) & 0xff) == 5) {

  134.             get_be16(pb); get_be16(pb); get_be16(pb);

  135.         }

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

  137.         get_be32(pb);

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

  139.         if (((version >> 16) & 0xff) == 5) {

  140.             get_be32(pb);

  141.             get_buffer(pb, buf, 4);

  142.             buf[4] = 0;

  143.         } else {

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

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

  146.         }

  147.         st->codec->codec_type = CODEC_TYPE_AUDIO;

  148.         if (!strcmp(buf, "dnet")) {

  149.             st->codec->codec_id = CODEC_ID_AC3;

  150.             st->need_parsing = AVSTREAM_PARSE_FULL;

  151.         } else if (!strcmp(buf, "28_8")) {

  152.             st->codec->codec_id = CODEC_ID_RA_288;

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

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

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

  156. 

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

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

  159.                 return -1;

  160.             }

  161. 

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

  163.         } else if ((!strcmp(buf, "cook")) || (!strcmp(buf, "atrc")) || (!strcmp(buf, "sipr"))) {

  164.             int codecdata_length;

  165.             get_be16(pb); get_byte(pb);

  166.             if (((version >> 16) & 0xff) == 5)

  167.                 get_byte(pb);

  168.             codecdata_length = get_be32(pb);

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

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

  171.                 return -1;

  172.             }

  173. 

  174.             if(sub_packet_size <= 0){

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

  176.                 return -1;

  177.             }

  178. 

  179.             if (!strcmp(buf, "cook")) st->codec->codec_id = CODEC_ID_COOK;

  180.             else if (!strcmp(buf, "sipr")) st->codec->codec_id = CODEC_ID_SIPR;

  181.             else st->codec->codec_id = CODEC_ID_ATRAC3;

  182.             st->codec->extradata_size= codecdata_length;

  183.             st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

  184.             get_buffer(pb, st->codec->extradata, st->codec->extradata_size);

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

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

  187. 

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

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

  190.                 return -1;

  191.             }

  192. 

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

  194.         } else if (!strcmp(buf, "raac") || !strcmp(buf, "racp")) {

  195.             int codecdata_length;

  196.             get_be16(pb); get_byte(pb);

  197.             if (((version >> 16) & 0xff) == 5)

  198.                 get_byte(pb);

  199.             st->codec->codec_id = CODEC_ID_AAC;

  200.             codecdata_length = get_be32(pb);

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

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

  203.                 return -1;

  204.             }

  205.             if (codecdata_length >= 1) {

  206.                 st->codec->extradata_size = codecdata_length - 1;

  207.                 st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

  208.                 get_byte(pb);

  209.                 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);

  210.             }

  211.         } else {

  212.             st->codec->codec_id = CODEC_ID_NONE;

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

  214.         }

  215.         if (read_all) {

  216.             get_byte(pb);

  217.             get_byte(pb);

  218.             get_byte(pb);

  219.             rm_read_metadata(s, 0);

  220.         }

  221.     }

  222.     return 0;

  223. }

  224. 

  225. int

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

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

  228. {

  229.     unsigned int v;

  230.     int size;

  231.     int64_t codec_pos;

  232. 

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

  234.     codec_pos = url_ftell(pb);

  235.     v = get_be32(pb);

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

  237.         /* ra type header */

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

  239.             return -1;

  240.     } else {

  241.         int fps, fps2;

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

  243.         fail1:

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

  245.             goto skip;

  246.         }

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

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

  249.         if (   st->codec->codec_tag != MKTAG('R', 'V', '1', '0')

  250.             && st->codec->codec_tag != MKTAG('R', 'V', '2', '0')

  251.             && st->codec->codec_tag != MKTAG('R', 'V', '3', '0')

  252.             && st->codec->codec_tag != MKTAG('R', 'V', '4', '0')

  253.             && st->codec->codec_tag != MKTAG('R', 'V', 'T', 'R'))

  254.             goto fail1;

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

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

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

  258.         fps= get_be16(pb);

  259.         st->codec->codec_type = CODEC_TYPE_VIDEO;

  260.         get_be32(pb);

  261.         fps2= get_be16(pb);

  262.         get_be16(pb);

  263. 

  264.         st->codec->extradata_size= codec_data_size - (url_ftell(pb) - codec_pos);

  265. 

  266.         if(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){

  267.             //check is redundant as get_buffer() will catch this

  268.             av_log(s, AV_LOG_ERROR, "st->codec->extradata_size too large\n");

  269.             return -1;

  270.         }

  271.         st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

  272.         if (!st->codec->extradata)

  273.             return AVERROR(ENOMEM);

  274.         get_buffer(pb, st->codec->extradata, st->codec->extradata_size);

  275. 

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

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

  278.         switch(((uint8_t*)st->codec->extradata)[4]>>4){

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

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

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

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

  283.         default: goto fail1;

  284.         }

  285.     }

  286. 

  287. skip:

  288.     /* skip codec info */

  289.     size = url_ftell(pb) - codec_pos;

  290.     url_fskip(pb, codec_data_size - size);

  291. 

  292.     return 0;

  293. }

  294. 

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

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

  297. static int rm_read_index(AVFormatContext *s)

  298. {

  299.     ByteIOContext *pb = s->pb;

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

  301.     AVStream *st;

  302. 

  303.     do {

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

  305.             return -1;

  306.         size     = get_be32(pb);

  307.         if (size < 20)

  308.             return -1;

  309.         url_fskip(pb, 2);

  310.         n_pkts   = get_be32(pb);

  311.         str_id   = get_be16(pb);

  312.         next_off = get_be32(pb);

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

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

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

  316.                 break;

  317.             }

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

  319.             goto skip;

  320. 

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

  322.             url_fskip(pb, 2);

  323.             pts = get_be32(pb);

  324.             pos = get_be32(pb);

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

  326. 

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

  328.         }

  329. 

  330. skip:

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

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

  333.             return -1;

  334.     } while (next_off);

  335. 

  336.     return 0;

  337. }

  338. 

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

  340. {

  341.     RMDemuxContext *rm = s->priv_data;

  342.     AVStream *st;

  343. 

  344.     rm->old_format = 1;

  345.     st = av_new_stream(s, 0);

  346.     if (!st)

  347.         return -1;

  348.     st->priv_data = ff_rm_alloc_rmstream();

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

  350. }

  351. 

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

  353. {

  354.     RMDemuxContext *rm = s->priv_data;

  355.     AVStream *st;

  356.     ByteIOContext *pb = s->pb;

  357.     unsigned int tag;

  358.     int tag_size;

  359.     unsigned int start_time, duration;

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

  361.     char buf[128];

  362.     int flags = 0;

  363. 

  364.     tag = get_le32(pb);

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

  366.         /* very old .ra format */

  367.         return rm_read_header_old(s, ap);

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

  369.         return AVERROR(EIO);

  370.     }

  371. 

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

  373.     get_be16(pb);

  374.     get_be32(pb);

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

  376. 

  377.     for(;;) {

  378.         if (url_feof(pb))

  379.             return -1;

  380.         tag = get_le32(pb);

  381.         tag_size = get_be32(pb);

  382.         get_be16(pb);

  383. #if 0

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

  385.                (tag) & 0xff,

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

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

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

  389.                tag,

  390.                tag_size);

  391. #endif

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

  393.             return -1;

  394.         switch(tag) {

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

  396.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

  408.             break;

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

  410.             rm_read_metadata(s, 1);

  411.             break;

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

  413.             st = av_new_stream(s, 0);

  414.             if (!st)

  415.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  424.             st->start_time = start_time;

  425.             st->duration = duration;

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

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

  428.             st->codec->codec_type = CODEC_TYPE_DATA;

  429.             st->priv_data = ff_rm_alloc_rmstream();

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

  431.                                           get_be32(pb)) < 0)

  432.                 return -1;

  433.             break;

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

  435.             goto header_end;

  436.         default:

  437.             /* unknown tag: skip it */

  438.             url_fskip(pb, tag_size - 10);

  439.             break;

  440.         }

  441.     }

  442.  header_end:

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

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

  445.         rm->nb_packets = 3600 * 25;

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

  447. 

  448.     if (!data_off)

  449.         data_off = url_ftell(pb) - 18;

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

  451.         rm_read_index(s);

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

  453.     }

  454. 

  455.     return 0;

  456. }

  457. 

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

  459. {

  460.     int n, n1;

  461. 

  462.     n = get_be16(pb);

  463.     (*len)-=2;

  464.     n &= 0x7FFF;

  465.     if (n >= 0x4000) {

  466.         return n - 0x4000;

  467.     } else {

  468.         n1 = get_be16(pb);

  469.         (*len)-=2;

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

  471.     }

  472. }

  473. 

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

  475. #define RAW_PACKET_SIZE 1000

  476. 

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

  478.     RMDemuxContext *rm = s->priv_data;

  479.     ByteIOContext *pb = s->pb;

  480.     int len, num, res, i;

  481.     AVStream *st;

  482.     uint32_t state=0xFFFFFFFF;

  483. 

  484.     while(!url_feof(pb)){

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

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

  487.             num= rm->current_stream;

  488.             len= rm->remaining_len;

  489.             *timestamp = AV_NOPTS_VALUE;

  490.             *flags= 0;

  491.         }else{

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

  493. 

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

  495.                 int n_pkts, expected_len;

  496.                 len = get_be32(pb);

  497.                 url_fskip(pb, 2);

  498.                 n_pkts = get_be32(pb);

  499.                 expected_len = 20 + n_pkts * 14;

  500.                 if (len == 20)

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

  502.                     len = expected_len;

  503.                 else if (len != expected_len)

  504.                     av_log(s, AV_LOG_WARNING,

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

  506.                            len, n_pkts, expected_len);

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

  508.                 if(len<0)

  509.                     continue;

  510.                 goto skip;

  511.             }

  512. 

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

  514.                 continue;

  515.             len=state;

  516.             state= 0xFFFFFFFF;

  517. 

  518.             num = get_be16(pb);

  519.             *timestamp = get_be32(pb);

  520.             res= get_byte(pb); /* reserved */

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

  522. 

  523. 

  524.             len -= 12;

  525.         }

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

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

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

  529.                 break;

  530.         }

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

  532. skip:

  533.             /* skip packet if unknown number */

  534.             url_fskip(pb, len);

  535.             rm->remaining_len = 0;

  536.             continue;

  537.         }

  538.         *stream_index= i;

  539. 

  540.         return len;

  541.     }

  542.     return -1;

  543. }

  544. 

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

  546.                                    RMDemuxContext *rm, RMStream *vst,

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

  548. {

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

  550.     int type;

  551. 

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

  553.     type = hdr >> 6;

  554. 

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

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

  557.     }

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

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

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

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

  562.     }

  563.     if(len<0)

  564.         return -1;

  565.     rm->remaining_len = len;

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

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

  568.             len= len2;

  569.         if(rm->remaining_len < len)

  570.             return -1;

  571.         rm->remaining_len -= len;

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

  573.             return AVERROR(EIO);

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

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

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

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

  578.         return 0;

  579.     }

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

  581. 

  582.     *pseq = seq;

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

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

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

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

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

  588.             return AVERROR(ENOMEM);

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

  590.         vst->cur_slice = 0;

  591.         vst->curpic_num = pic_num;

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

  593.     }

  594.     if(type == 2)

  595.         len = FFMIN(len, pos);

  596. 

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

  598.         return 1;

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

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

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

  602.         return 1;

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

  604.         return AVERROR(EIO);

  605.     vst->videobufpos += len;

  606.     rm->remaining_len-= len;

  607. 

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

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

  610.         *pkt= vst->pkt;

  611.         vst->pkt.data= NULL;

  612.         vst->pkt.size= 0;

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

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

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

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

  617.         pkt->pts = AV_NOPTS_VALUE;

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

  619.         return 0;

  620.     }

  621. 

  622.     return 1;

  623. }

  624. 

  625. static inline void

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

  627. {

  628.     uint8_t *ptr;

  629.     int j;

  630. 

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

  632.         ptr = pkt->data;

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

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

  635.             ptr += 2;

  636.         }

  637.     }

  638. }

  639. 

  640. int

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

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

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

  644. {

  645.     RMDemuxContext *rm = s->priv_data;

  646. 

  647.     if (st->codec->codec_type == CODEC_TYPE_VIDEO) {

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

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

  650.             return -1; //got partial frame

  651.     } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {

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

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

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

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

  656.             int x;

  657.             int sps = ast->sub_packet_size;

  658.             int cfs = ast->coded_framesize;

  659.             int h = ast->sub_packet_h;

  660.             int y = ast->sub_packet_cnt;

  661.             int w = ast->audio_framesize;

  662. 

  663.             if (*flags & 2)

  664.                 y = ast->sub_packet_cnt = 0;

  665.             if (!y)

  666.                 ast->audiotimestamp = *timestamp;

  667. 

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

  669.                 case CODEC_ID_RA_288:

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

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

  672.                     break;

  673.                 case CODEC_ID_ATRAC3:

  674.                 case CODEC_ID_COOK:

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

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

  677.                     break;

  678.             }

  679. 

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

  681.                 return -1;

  682.              ast->sub_packet_cnt = 0;

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

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

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

  686.             int x;

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

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

  689.             if (ast->sub_packet_cnt) {

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

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

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

  693.                 ast->audiotimestamp = *timestamp;

  694.             } else

  695.                 return -1;

  696.         } else {

  697.             av_get_packet(pb, pkt, len);

  698.             rm_ac3_swap_bytes(st, pkt);

  699.         }

  700.     } else

  701.         av_get_packet(pb, pkt, len);

  702. 

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

  704. 

  705. #if 0

  706.     if (st->codec->codec_type == CODEC_TYPE_VIDEO) {

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

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

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

  710. 

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

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

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

  714.         }

  715.     }

  716. #endif

  717. 

  718.     pkt->pts= *timestamp;

  719.     if (*flags & 2)

  720.         pkt->flags |= PKT_FLAG_KEY;

  721. 

  722.     return st->codec->codec_type == CODEC_TYPE_AUDIO ? rm->audio_pkt_cnt : 0;

  723. }

  724. 

  725. int

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

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

  728. {

  729.     RMDemuxContext *rm = s->priv_data;

  730. 

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

  732. 

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

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

  735.     else {

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

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

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

  739.                st->codec->block_align);

  740.     }

  741.     rm->audio_pkt_cnt--;

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

  743.         ast->audiotimestamp = AV_NOPTS_VALUE;

  744.         pkt->flags = PKT_FLAG_KEY;

  745.     } else

  746.         pkt->flags = 0;

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

  748. 

  749.     return rm->audio_pkt_cnt;

  750. }

  751. 

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

  753. {

  754.     RMDemuxContext *rm = s->priv_data;

  755.     AVStream *st;

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

  757.     int64_t timestamp, pos;

  758.     int old_flags, flags;

  759. 

  760.     for (;;) {

  761.         if (rm->audio_pkt_cnt) {

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

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

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

  765.         } else {

  766.             if (rm->old_format) {

  767.                 RMStream *ast;

  768. 

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

  770.                 ast = st->priv_data;

  771.                 timestamp = AV_NOPTS_VALUE;

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

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

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

  775.             } else {

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

  777.                 if (len > 0)

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

  779.             }

  780. 

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

  782.                 return AVERROR(EIO);

  783. 

  784.             old_flags = flags;

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

  786.                                       &seq, &flags, &timestamp);

  787.             if((old_flags&2) && (seq&0x7F) == 1)

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

  789.             if (res)

  790.                 continue;

  791.         }

  792. 

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

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

  795.             av_free_packet(pkt);

  796.         } else

  797.             break;

  798.     }

  799. 

  800.     return 0;

  801. }

  802. 

  803. static int rm_read_close(AVFormatContext *s)

  804. {

  805.     int i;

  806. 

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

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

  809. 

  810.     return 0;

  811. }

  812. 

  813. static int rm_probe(AVProbeData *p)

  814. {

  815.     /* check file header */

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

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

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

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

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

  821.         return AVPROBE_SCORE_MAX;

  822.     else

  823.         return 0;

  824. }

  825. 

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

  827.                                int64_t *ppos, int64_t pos_limit)

  828. {

  829.     RMDemuxContext *rm = s->priv_data;

  830.     int64_t pos, dts;

  831.     int stream_index2, flags, len, h;

  832. 

  833.     pos = *ppos;

  834. 

  835.     if(rm->old_format)

  836.         return AV_NOPTS_VALUE;

  837. 

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

  839.     rm->remaining_len=0;

  840.     for(;;){

  841.         int seq=1;

  842.         AVStream *st;

  843. 

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

  845.         if(len<0)

  846.             return AV_NOPTS_VALUE;

  847. 

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

  849.         if (st->codec->codec_type == CODEC_TYPE_VIDEO) {

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

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

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

  853.             }

  854.         }

  855. 

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

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

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

  859.             if(stream_index2 == stream_index)

  860.                 break;

  861.         }

  862. 

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

  864.     }

  865.     *ppos = pos;

  866.     return dts;

  867. }

  868. 

  869. AVInputFormat rm_demuxer = {

  870.     "rm",

  871.     NULL_IF_CONFIG_SMALL("RealMedia format"),

  872.     sizeof(RMDemuxContext),

  873.     rm_probe,

  874.     rm_read_header,

  875.     rm_read_packet,

  876.     rm_read_close,

  877.     NULL,

  878.     rm_read_dts,

  879. };

  880. 

  881. AVInputFormat rdt_demuxer = {

  882.     "rdt",

  883.     NULL_IF_CONFIG_SMALL("RDT demuxer"),

  884.     sizeof(RMDemuxContext),

  885.     NULL,

  886.     NULL,

  887.     NULL,

  888.     rm_read_close,

  889. };