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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 const unsigned char sipr_swaps[38][2] = {

  52.     {  0, 63 }, {  1, 22 }, {  2, 44 }, {  3, 90 },

  53.     {  5, 81 }, {  7, 31 }, {  8, 86 }, {  9, 58 },

  54.     { 10, 36 }, { 12, 68 }, { 13, 39 }, { 14, 73 },

  55.     { 15, 53 }, { 16, 69 }, { 17, 57 }, { 19, 88 },

  56.     { 20, 34 }, { 21, 71 }, { 24, 46 }, { 25, 94 },

  57.     { 26, 54 }, { 28, 75 }, { 29, 50 }, { 32, 70 },

  58.     { 33, 92 }, { 35, 74 }, { 38, 85 }, { 40, 56 },

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

  60.     { 49, 93 }, { 51, 89 }, { 55, 95 }, { 61, 76 },

  61.     { 67, 83 }, { 77, 80 }

  62. };

  63. 

  64. static const unsigned char sipr_subpk_size[4] = { 29, 19, 37, 20 };

  65. 

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

  67. {

  68.     int i;

  69.     char *q, r;

  70. 

  71.     q = buf;

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

  73.         r = get_byte(pb);

  74.         if (i < buf_size - 1)

  75.             *q++ = r;

  76.     }

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

  78. }

  79. 

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

  81. {

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

  83. }

  84. 

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

  86. {

  87.     char buf[1024];

  88.     int i;

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

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

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

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

  93.     }

  94. }

  95. 

  96. RMStream *ff_rm_alloc_rmstream (void)

  97. {

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

  99.     rms->curpic_num = -1;

  100.     return rms;

  101. }

  102. 

  103. void ff_rm_free_rmstream (RMStream *rms)

  104. {

  105.     av_free_packet(&rms->pkt);

  106. }

  107. 

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

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

  110. {

  111.     char buf[256];

  112.     uint32_t version;

  113. 

  114.     /* ra type header */

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

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

  117.         int64_t startpos = url_ftell(pb);

  118.         url_fskip(pb, 14);

  119.         rm_read_metadata(s, 0);

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

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

  122.             get_byte(pb);

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

  124.         }

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

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

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

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

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

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

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

  132.     } else {

  133.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  134.         /* old version (4) */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  149.             get_be16(pb); get_be16(pb); get_be16(pb);

  150.         }

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

  152.         get_be32(pb);

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

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

  155.             get_be32(pb);

  156.             get_buffer(pb, buf, 4);

  157.             buf[4] = 0;

  158.         } else {

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

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

  161.         }

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

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

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

  165.             st->need_parsing = AVSTREAM_PARSE_FULL;

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

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

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

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

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

  171. 

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

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

  174.                 return -1;

  175.             }

  176. 

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

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

  179.             int codecdata_length;

  180.             get_be16(pb); get_byte(pb);

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

  182.                 get_byte(pb);

  183.             codecdata_length = get_be32(pb);

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

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

  186.                 return -1;

  187.             }

  188. 

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

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

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

  192. 

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

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

  195.                 if (flavor > 3) {

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

  197.                            flavor);

  198.                     return -1;

  199.                 }

  200.                 st->codec->block_align = sipr_subpk_size[flavor];

  201.             } else {

  202.                 if(sub_packet_size <= 0){

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

  204.                     return -1;

  205.                 }

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

  207.             }

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

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

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

  211. 

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

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

  214.                 return -1;

  215.             }

  216. 

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

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

  219.             int codecdata_length;

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

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

  222.                 get_byte(pb);

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

  224.             codecdata_length = get_be32(pb);

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

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

  227.                 return -1;

  228.             }

  229.             if (codecdata_length >= 1) {

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

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

  232.                 get_byte(pb);

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

  234.             }

  235.         } else {

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

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

  238.         }

  239.         if (read_all) {

  240.             get_byte(pb);

  241.             get_byte(pb);

  242.             get_byte(pb);

  243.             rm_read_metadata(s, 0);

  244.         }

  245.     }

  246.     return 0;

  247. }

  248. 

  249. int

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

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

  252. {

  253.     unsigned int v;

  254.     int size;

  255.     int64_t codec_pos;

  256. 

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

  258.     codec_pos = url_ftell(pb);

  259.     v = get_be32(pb);

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

  261.         /* ra type header */

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

  263.             return -1;

  264.     } else {

  265.         int fps, fps2;

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

  267.         fail1:

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

  269.             goto skip;

  270.         }

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

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

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

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

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

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

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

  278.             goto fail1;

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

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

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

  282.         fps= get_be16(pb);

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

  284.         get_be32(pb);

  285.         fps2= get_be16(pb);

  286.         get_be16(pb);

  287. 

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

  289. 

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

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

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

  293.             return -1;

  294.         }

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

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

  297.             return AVERROR(ENOMEM);

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

  299. 

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

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

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

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

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

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

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

  307.         default: goto fail1;

  308.         }

  309.     }

  310. 

  311. skip:

  312.     /* skip codec info */

  313.     size = url_ftell(pb) - codec_pos;

  314.     url_fskip(pb, codec_data_size - size);

  315. 

  316.     return 0;

  317. }

  318. 

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

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

  321. static int rm_read_index(AVFormatContext *s)

  322. {

  323.     ByteIOContext *pb = s->pb;

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

  325.     AVStream *st;

  326. 

  327.     do {

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

  329.             return -1;

  330.         size     = get_be32(pb);

  331.         if (size < 20)

  332.             return -1;

  333.         url_fskip(pb, 2);

  334.         n_pkts   = get_be32(pb);

  335.         str_id   = get_be16(pb);

  336.         next_off = get_be32(pb);

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

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

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

  340.                 break;

  341.             }

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

  343.             goto skip;

  344. 

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

  346.             url_fskip(pb, 2);

  347.             pts = get_be32(pb);

  348.             pos = get_be32(pb);

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

  350. 

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

  352.         }

  353. 

  354. skip:

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

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

  357.             return -1;

  358.     } while (next_off);

  359. 

  360.     return 0;

  361. }

  362. 

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

  364. {

  365.     RMDemuxContext *rm = s->priv_data;

  366.     AVStream *st;

  367. 

  368.     rm->old_format = 1;

  369.     st = av_new_stream(s, 0);

  370.     if (!st)

  371.         return -1;

  372.     st->priv_data = ff_rm_alloc_rmstream();

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

  374. }

  375. 

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

  377. {

  378.     RMDemuxContext *rm = s->priv_data;

  379.     AVStream *st;

  380.     ByteIOContext *pb = s->pb;

  381.     unsigned int tag;

  382.     int tag_size;

  383.     unsigned int start_time, duration;

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

  385.     char buf[128];

  386.     int flags = 0;

  387. 

  388.     tag = get_le32(pb);

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

  390.         /* very old .ra format */

  391.         return rm_read_header_old(s, ap);

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

  393.         return AVERROR(EIO);

  394.     }

  395. 

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

  397.     get_be16(pb);

  398.     get_be32(pb);

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

  400. 

  401.     for(;;) {

  402.         if (url_feof(pb))

  403.             return -1;

  404.         tag = get_le32(pb);

  405.         tag_size = get_be32(pb);

  406.         get_be16(pb);

  407. #if 0

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

  409.                (tag) & 0xff,

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

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

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

  413.                tag,

  414.                tag_size);

  415. #endif

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

  417.             return -1;

  418.         switch(tag) {

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

  420.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

  432.             break;

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

  434.             rm_read_metadata(s, 1);

  435.             break;

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

  437.             st = av_new_stream(s, 0);

  438.             if (!st)

  439.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  448.             st->start_time = start_time;

  449.             st->duration = duration;

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

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

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

  453.             st->priv_data = ff_rm_alloc_rmstream();

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

  455.                                           get_be32(pb)) < 0)

  456.                 return -1;

  457.             break;

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

  459.             goto header_end;

  460.         default:

  461.             /* unknown tag: skip it */

  462.             url_fskip(pb, tag_size - 10);

  463.             break;

  464.         }

  465.     }

  466.  header_end:

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

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

  469.         rm->nb_packets = 3600 * 25;

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

  471. 

  472.     if (!data_off)

  473.         data_off = url_ftell(pb) - 18;

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

  475.         rm_read_index(s);

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

  477.     }

  478. 

  479.     return 0;

  480. }

  481. 

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

  483. {

  484.     int n, n1;

  485. 

  486.     n = get_be16(pb);

  487.     (*len)-=2;

  488.     n &= 0x7FFF;

  489.     if (n >= 0x4000) {

  490.         return n - 0x4000;

  491.     } else {

  492.         n1 = get_be16(pb);

  493.         (*len)-=2;

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

  495.     }

  496. }

  497. 

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

  499. #define RAW_PACKET_SIZE 1000

  500. 

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

  502.     RMDemuxContext *rm = s->priv_data;

  503.     ByteIOContext *pb = s->pb;

  504.     AVStream *st;

  505.     uint32_t state=0xFFFFFFFF;

  506. 

  507.     while(!url_feof(pb)){

  508.         int len, num, res, i;

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

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

  511.             num= rm->current_stream;

  512.             len= rm->remaining_len;

  513.             *timestamp = AV_NOPTS_VALUE;

  514.             *flags= 0;

  515.         }else{

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

  517. 

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

  519.                 int n_pkts, expected_len;

  520.                 len = get_be32(pb);

  521.                 url_fskip(pb, 2);

  522.                 n_pkts = get_be32(pb);

  523.                 expected_len = 20 + n_pkts * 14;

  524.                 if (len == 20)

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

  526.                     len = expected_len;

  527.                 else if (len != expected_len)

  528.                     av_log(s, AV_LOG_WARNING,

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

  530.                            len, n_pkts, expected_len);

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

  532.                 if(len<0)

  533.                     continue;

  534.                 goto skip;

  535.             }

  536. 

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

  538.                 continue;

  539.             len=state - 12;

  540.             state= 0xFFFFFFFF;

  541. 

  542.             num = get_be16(pb);

  543.             *timestamp = get_be32(pb);

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

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

  546.         }

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

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

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

  550.                 break;

  551.         }

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

  553. skip:

  554.             /* skip packet if unknown number */

  555.             url_fskip(pb, len);

  556.             rm->remaining_len = 0;

  557.             continue;

  558.         }

  559.         *stream_index= i;

  560. 

  561.         return len;

  562.     }

  563.     return -1;

  564. }

  565. 

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

  567.                                    RMDemuxContext *rm, RMStream *vst,

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

  569. {

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

  571.     int type;

  572. 

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

  574.     type = hdr >> 6;

  575. 

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

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

  578.     }

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

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

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

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

  583.     }

  584.     if(len<0)

  585.         return -1;

  586.     rm->remaining_len = len;

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

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

  589.             len= len2;

  590.         if(rm->remaining_len < len)

  591.             return -1;

  592.         rm->remaining_len -= len;

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

  594.             return AVERROR(EIO);

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

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

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

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

  599.         return 0;

  600.     }

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

  602. 

  603.     *pseq = seq;

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

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

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

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

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

  609.             return AVERROR(ENOMEM);

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

  611.         vst->cur_slice = 0;

  612.         vst->curpic_num = pic_num;

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

  614.     }

  615.     if(type == 2)

  616.         len = FFMIN(len, pos);

  617. 

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

  619.         return 1;

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

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

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

  623.         return 1;

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

  625.         return AVERROR(EIO);

  626.     vst->videobufpos += len;

  627.     rm->remaining_len-= len;

  628. 

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

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

  631.         *pkt= vst->pkt;

  632.         vst->pkt.data= NULL;

  633.         vst->pkt.size= 0;

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

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

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

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

  638.         pkt->pts = AV_NOPTS_VALUE;

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

  640.         return 0;

  641.     }

  642. 

  643.     return 1;

  644. }

  645. 

  646. static inline void

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

  648. {

  649.     uint8_t *ptr;

  650.     int j;

  651. 

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

  653.         ptr = pkt->data;

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

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

  656.             ptr += 2;

  657.         }

  658.     }

  659. }

  660. 

  661. /**

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

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

  664.  */

  665. static void

  666. rm_reorder_sipr_data (RMStream *ast)

  667. {

  668.     int n, bs = ast->sub_packet_h * ast->audio_framesize * 2 / 96; // nibbles per subpacket

  669. 

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

  671.         int j;

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

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

  674.         uint8_t *buf = ast->pkt.data;

  675. 

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

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

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

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

  680. 

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

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

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

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

  685.         }

  686.     }

  687. }

  688. 

  689. int

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

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

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

  693. {

  694.     RMDemuxContext *rm = s->priv_data;

  695. 

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

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

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

  699.             return -1; //got partial frame

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

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

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

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

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

  705.             int x;

  706.             int sps = ast->sub_packet_size;

  707.             int cfs = ast->coded_framesize;

  708.             int h = ast->sub_packet_h;

  709.             int y = ast->sub_packet_cnt;

  710.             int w = ast->audio_framesize;

  711. 

  712.             if (*flags & 2)

  713.                 y = ast->sub_packet_cnt = 0;

  714.             if (!y)

  715.                 ast->audiotimestamp = *timestamp;

  716. 

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

  718.                 case CODEC_ID_RA_288:

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

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

  721.                     break;

  722.                 case CODEC_ID_ATRAC3:

  723.                 case CODEC_ID_COOK:

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

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

  726.                     break;

  727.                 case CODEC_ID_SIPR:

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

  729.                     break;

  730.             }

  731. 

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

  733.                 return -1;

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

  735.                 rm_reorder_sipr_data(ast);

  736. 

  737.              ast->sub_packet_cnt = 0;

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

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

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

  741.             int x;

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

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

  744.             if (ast->sub_packet_cnt) {

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

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

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

  748.                 ast->audiotimestamp = *timestamp;

  749.             } else

  750.                 return -1;

  751.         } else {

  752.             av_get_packet(pb, pkt, len);

  753.             rm_ac3_swap_bytes(st, pkt);

  754.         }

  755.     } else

  756.         av_get_packet(pb, pkt, len);

  757. 

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

  759. 

  760. #if 0

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

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

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

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

  765. 

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

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

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

  769.         }

  770.     }

  771. #endif

  772. 

  773.     pkt->pts= *timestamp;

  774.     if (*flags & 2)

  775.         pkt->flags |= PKT_FLAG_KEY;

  776. 

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

  778. }

  779. 

  780. int

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

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

  783. {

  784.     RMDemuxContext *rm = s->priv_data;

  785. 

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

  787. 

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

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

  790.     else {

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

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

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

  794.                st->codec->block_align);

  795.     }

  796.     rm->audio_pkt_cnt--;

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

  798.         ast->audiotimestamp = AV_NOPTS_VALUE;

  799.         pkt->flags = PKT_FLAG_KEY;

  800.     } else

  801.         pkt->flags = 0;

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

  803. 

  804.     return rm->audio_pkt_cnt;

  805. }

  806. 

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

  808. {

  809.     RMDemuxContext *rm = s->priv_data;

  810.     AVStream *st;

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

  812.     int64_t timestamp, pos;

  813.     int old_flags, flags;

  814. 

  815.     for (;;) {

  816.         if (rm->audio_pkt_cnt) {

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

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

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

  820.         } else {

  821.             if (rm->old_format) {

  822.                 RMStream *ast;

  823. 

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

  825.                 ast = st->priv_data;

  826.                 timestamp = AV_NOPTS_VALUE;

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

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

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

  830.             } else {

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

  832.                 if (len > 0)

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

  834.             }

  835. 

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

  837.                 return AVERROR(EIO);

  838. 

  839.             old_flags = flags;

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

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

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

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

  844.             if (res)

  845.                 continue;

  846.         }

  847. 

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

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

  850.             av_free_packet(pkt);

  851.         } else

  852.             break;

  853.     }

  854. 

  855.     return 0;

  856. }

  857. 

  858. static int rm_read_close(AVFormatContext *s)

  859. {

  860.     int i;

  861. 

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

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

  864. 

  865.     return 0;

  866. }

  867. 

  868. static int rm_probe(AVProbeData *p)

  869. {

  870.     /* check file header */

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

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

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

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

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

  876.         return AVPROBE_SCORE_MAX;

  877.     else

  878.         return 0;

  879. }

  880. 

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

  882.                                int64_t *ppos, int64_t pos_limit)

  883. {

  884.     RMDemuxContext *rm = s->priv_data;

  885.     int64_t pos, dts;

  886.     int stream_index2, flags, len, h;

  887. 

  888.     pos = *ppos;

  889. 

  890.     if(rm->old_format)

  891.         return AV_NOPTS_VALUE;

  892. 

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

  894.     rm->remaining_len=0;

  895.     for(;;){

  896.         int seq=1;

  897.         AVStream *st;

  898. 

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

  900.         if(len<0)

  901.             return AV_NOPTS_VALUE;

  902. 

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

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

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

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

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

  908.             }

  909.         }

  910. 

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

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

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

  914.             if(stream_index2 == stream_index)

  915.                 break;

  916.         }

  917. 

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

  919.     }

  920.     *ppos = pos;

  921.     return dts;

  922. }

  923. 

  924. AVInputFormat rm_demuxer = {

  925.     "rm",

  926.     NULL_IF_CONFIG_SMALL("RealMedia format"),

  927.     sizeof(RMDemuxContext),

  928.     rm_probe,

  929.     rm_read_header,

  930.     rm_read_packet,

  931.     rm_read_close,

  932.     NULL,

  933.     rm_read_dts,

  934. };

  935. 

  936. AVInputFormat rdt_demuxer = {

  937.     "rdt",

  938.     NULL_IF_CONFIG_SMALL("RDT demuxer"),

  939.     sizeof(RMDemuxContext),

  940.     NULL,

  941.     NULL,

  942.     NULL,

  943.     rm_read_close,

  944. };