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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_str16(ByteIOContext *pb, char *buf, int buf_size)

  66. {

  67.     get_strl(pb, buf, buf_size, get_be16(pb));

  68. }

  69. 

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

  71. {

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

  73. }

  74. 

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

  76. {

  77.     char buf[1024];

  78.     int i;

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

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

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

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

  83.     }

  84. }

  85. 

  86. RMStream *ff_rm_alloc_rmstream (void)

  87. {

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

  89.     rms->curpic_num = -1;

  90.     return rms;

  91. }

  92. 

  93. void ff_rm_free_rmstream (RMStream *rms)

  94. {

  95.     av_free_packet(&rms->pkt);

  96. }

  97. 

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

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

  100. {

  101.     char buf[256];

  102.     uint32_t version;

  103. 

  104.     /* ra type header */

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

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

  107.         int64_t startpos = url_ftell(pb);

  108.         url_fskip(pb, 14);

  109.         rm_read_metadata(s, 0);

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

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

  112.             get_byte(pb);

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

  114.         }

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

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

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

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

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

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

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

  122.     } else {

  123.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  124.         /* old version (4) */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  139.             get_be16(pb); get_be16(pb); get_be16(pb);

  140.         }

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

  142.         get_be32(pb);

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

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

  145.             get_be32(pb);

  146.             get_buffer(pb, buf, 4);

  147.             buf[4] = 0;

  148.         } else {

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

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

  151.         }

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

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

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

  155.             st->need_parsing = AVSTREAM_PARSE_FULL;

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

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

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

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

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

  161. 

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

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

  164.                 return -1;

  165.             }

  166. 

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

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

  169.             int codecdata_length;

  170.             get_be16(pb); get_byte(pb);

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

  172.                 get_byte(pb);

  173.             codecdata_length = get_be32(pb);

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

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

  176.                 return -1;

  177.             }

  178. 

  179.             if(sub_packet_size <= 0){

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

  181.                 return -1;

  182.             }

  183. 

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

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

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

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

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

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

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

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

  192. 

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

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

  195.                 return -1;

  196.             }

  197. 

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

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

  200.             int codecdata_length;

  201.             get_be16(pb); get_byte(pb);

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

  203.                 get_byte(pb);

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

  205.             codecdata_length = get_be32(pb);

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

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

  208.                 return -1;

  209.             }

  210.             if (codecdata_length >= 1) {

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

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

  213.                 get_byte(pb);

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

  215.             }

  216.         } else {

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

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

  219.         }

  220.         if (read_all) {

  221.             get_byte(pb);

  222.             get_byte(pb);

  223.             get_byte(pb);

  224.             rm_read_metadata(s, 0);

  225.         }

  226.     }

  227.     return 0;

  228. }

  229. 

  230. int

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

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

  233. {

  234.     unsigned int v;

  235.     int size;

  236.     int64_t codec_pos;

  237. 

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

  239.     codec_pos = url_ftell(pb);

  240.     v = get_be32(pb);

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

  242.         /* ra type header */

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

  244.             return -1;

  245.     } else {

  246.         int fps, fps2;

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

  248.         fail1:

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

  250.             goto skip;

  251.         }

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

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

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

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

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

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

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

  259.             goto fail1;

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

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

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

  263.         fps= get_be16(pb);

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

  265.         get_be32(pb);

  266.         fps2= get_be16(pb);

  267.         get_be16(pb);

  268. 

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

  270. 

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

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

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

  274.             return -1;

  275.         }

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

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

  278.             return AVERROR(ENOMEM);

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

  280. 

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

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

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

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

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

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

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

  288.         default: goto fail1;

  289.         }

  290.     }

  291. 

  292. skip:

  293.     /* skip codec info */

  294.     size = url_ftell(pb) - codec_pos;

  295.     url_fskip(pb, codec_data_size - size);

  296. 

  297.     return 0;

  298. }

  299. 

  300. 

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

  302. {

  303.     RMDemuxContext *rm = s->priv_data;

  304.     AVStream *st;

  305. 

  306.     rm->old_format = 1;

  307.     st = av_new_stream(s, 0);

  308.     if (!st)

  309.         return -1;

  310.     st->priv_data = ff_rm_alloc_rmstream();

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

  312. }

  313. 

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

  315. {

  316.     RMDemuxContext *rm = s->priv_data;

  317.     AVStream *st;

  318.     ByteIOContext *pb = s->pb;

  319.     unsigned int tag;

  320.     int tag_size;

  321.     unsigned int start_time, duration;

  322.     char buf[128];

  323.     int flags = 0;

  324. 

  325.     tag = get_le32(pb);

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

  327.         /* very old .ra format */

  328.         return rm_read_header_old(s, ap);

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

  330.         return AVERROR(EIO);

  331.     }

  332. 

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

  334.     get_be16(pb);

  335.     get_be32(pb);

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

  337. 

  338.     for(;;) {

  339.         if (url_feof(pb))

  340.             return -1;

  341.         tag = get_le32(pb);

  342.         tag_size = get_be32(pb);

  343.         get_be16(pb);

  344. #if 0

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

  346.                (tag) & 0xff,

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

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

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

  350.                tag,

  351.                tag_size);

  352. #endif

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

  354.             return -1;

  355.         switch(tag) {

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

  357.             /* file header */

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

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

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

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

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

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

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

  365.             get_be32(pb); /* index offset */

  366.             get_be32(pb); /* data offset */

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

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

  369.             break;

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

  371.             rm_read_metadata(s, 1);

  372.             break;

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

  374.             st = av_new_stream(s, 0);

  375.             if (!st)

  376.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  385.             st->start_time = start_time;

  386.             st->duration = duration;

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

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

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

  390.             st->priv_data = ff_rm_alloc_rmstream();

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

  392.                                           get_be32(pb)) < 0)

  393.                 return -1;

  394.             break;

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

  396.             goto header_end;

  397.         default:

  398.             /* unknown tag: skip it */

  399.             url_fskip(pb, tag_size - 10);

  400.             break;

  401.         }

  402.     }

  403.  header_end:

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

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

  406.         rm->nb_packets = 3600 * 25;

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

  408.     return 0;

  409. }

  410. 

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

  412. {

  413.     int n, n1;

  414. 

  415.     n = get_be16(pb);

  416.     (*len)-=2;

  417.     n &= 0x7FFF;

  418.     if (n >= 0x4000) {

  419.         return n - 0x4000;

  420.     } else {

  421.         n1 = get_be16(pb);

  422.         (*len)-=2;

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

  424.     }

  425. }

  426. 

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

  428. #define RAW_PACKET_SIZE 1000

  429. 

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

  431.     RMDemuxContext *rm = s->priv_data;

  432.     ByteIOContext *pb = s->pb;

  433.     int len, num, res, i;

  434.     AVStream *st;

  435.     uint32_t state=0xFFFFFFFF;

  436. 

  437.     while(!url_feof(pb)){

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

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

  440.             num= rm->current_stream;

  441.             len= rm->remaining_len;

  442.             *timestamp = AV_NOPTS_VALUE;

  443.             *flags= 0;

  444.         }else{

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

  446. 

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

  448.                 len = get_be16(pb) - 6;

  449.                 if(len<0)

  450.                     continue;

  451.                 goto skip;

  452.             }

  453. 

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

  455.                 continue;

  456.             len=state;

  457.             state= 0xFFFFFFFF;

  458. 

  459.             num = get_be16(pb);

  460.             *timestamp = get_be32(pb);

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

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

  463. 

  464. 

  465.             len -= 12;

  466.         }

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

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

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

  470.                 break;

  471.         }

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

  473. skip:

  474.             /* skip packet if unknown number */

  475.             url_fskip(pb, len);

  476.             rm->remaining_len -= len;

  477.             continue;

  478.         }

  479.         *stream_index= i;

  480. 

  481.         return len;

  482.     }

  483.     return -1;

  484. }

  485. 

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

  487.                                    RMDemuxContext *rm, RMStream *vst,

  488.                                    AVPacket *pkt, int len)

  489. {

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

  491.     int type;

  492. 

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

  494.     type = hdr >> 6;

  495. 

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

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

  498.     }

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

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

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

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

  503.     }

  504.     if(len<0)

  505.         return -1;

  506.     rm->remaining_len = len;

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

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

  509.             len= len2;

  510.         if(rm->remaining_len < len)

  511.             return -1;

  512.         rm->remaining_len -= len;

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

  514.             return AVERROR(EIO);

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

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

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

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

  519.         return 0;

  520.     }

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

  522. 

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

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

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

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

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

  528.             return AVERROR(ENOMEM);

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

  530.         vst->cur_slice = 0;

  531.         vst->curpic_num = pic_num;

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

  533.     }

  534.     if(type == 2)

  535.         len = FFMIN(len, pos);

  536. 

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

  538.         return 1;

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

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

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

  542.         return 1;

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

  544.         return AVERROR(EIO);

  545.     vst->videobufpos += len;

  546.     rm->remaining_len-= len;

  547. 

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

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

  550.         *pkt= vst->pkt;

  551.         vst->pkt.data= NULL;

  552.         vst->pkt.size= 0;

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

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

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

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

  557.         pkt->pts = AV_NOPTS_VALUE;

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

  559.         return 0;

  560.     }

  561. 

  562.     return 1;

  563. }

  564. 

  565. static inline void

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

  567. {

  568.     uint8_t *ptr;

  569.     int j;

  570. 

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

  572.         ptr = pkt->data;

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

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

  575.             ptr += 2;

  576.         }

  577.     }

  578. }

  579. 

  580. int

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

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

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

  584. {

  585.     RMDemuxContext *rm = s->priv_data;

  586. 

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

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

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

  590.             return -1; //got partial frame

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

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

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

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

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

  596.             int x;

  597.             int sps = ast->sub_packet_size;

  598.             int cfs = ast->coded_framesize;

  599.             int h = ast->sub_packet_h;

  600.             int y = ast->sub_packet_cnt;

  601.             int w = ast->audio_framesize;

  602. 

  603.             if (*flags & 2)

  604.                 y = ast->sub_packet_cnt = 0;

  605.             if (!y)

  606.                 ast->audiotimestamp = *timestamp;

  607. 

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

  609.                 case CODEC_ID_RA_288:

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

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

  612.                     break;

  613.                 case CODEC_ID_ATRAC3:

  614.                 case CODEC_ID_COOK:

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

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

  617.                     break;

  618.             }

  619. 

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

  621.                 return -1;

  622.             else {

  623.                 ast->sub_packet_cnt = 0;

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

  625.                 rm->audio_pkt_cnt = h * w / st->codec->block_align - 1;

  626.                 // Release first audio packet

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

  628.                 memcpy(pkt->data, ast->pkt.data, st->codec->block_align); //FIXME avoid this

  629.                 *timestamp = ast->audiotimestamp;

  630.                 *flags = 2; // Mark first packet as keyframe

  631.             }

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

  633.             int x;

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

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

  636.             if (ast->sub_packet_cnt) {

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

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

  639.                 // Release first audio packet

  640.                 rm->audio_pkt_cnt = ast->sub_packet_cnt - 1;

  641.                 av_get_packet(pb, pkt, ast->sub_packet_lengths[0]);

  642.                 *flags = 2; // Mark first packet as keyframe

  643.             }

  644.         } else {

  645.             av_get_packet(pb, pkt, len);

  646.             rm_ac3_swap_bytes(st, pkt);

  647.         }

  648.     } else

  649.         av_get_packet(pb, pkt, len);

  650. 

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

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

  653.         av_free_packet(pkt);

  654.         return -1;

  655.     }

  656. 

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

  658. 

  659. #if 0

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

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

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

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

  664. 

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

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

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

  668.         }

  669.     }

  670. #endif

  671. 

  672.     pkt->pts= *timestamp;

  673.     if (*flags & 2)

  674.         pkt->flags |= PKT_FLAG_KEY;

  675. 

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

  677. }

  678. 

  679. int

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

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

  682. {

  683.     RMDemuxContext *rm = s->priv_data;

  684. 

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

  686. 

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

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

  689.     else {

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

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

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

  693.                st->codec->block_align);

  694.     }

  695.     rm->audio_pkt_cnt--;

  696.     pkt->flags = 0;

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

  698. 

  699.     return rm->audio_pkt_cnt;

  700. }

  701. 

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

  703. {

  704.     RMDemuxContext *rm = s->priv_data;

  705.     ByteIOContext *pb = s->pb;

  706.     AVStream *st;

  707.     int i, len;

  708.     int64_t timestamp, pos;

  709.     int flags;

  710. 

  711.     if (rm->audio_pkt_cnt) {

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

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

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

  715.     } else if (rm->old_format) {

  716.         RMStream *ast;

  717. 

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

  719.         ast = st->priv_data;

  720.         if (st->codec->codec_id == CODEC_ID_RA_288) {

  721.             int x, y;

  722. 

  723.             for (y = 0; y < ast->sub_packet_h; y++)

  724.                 for (x = 0; x < ast->sub_packet_h/2; x++)

  725.                     if (get_buffer(pb, ast->pkt.data+x*2*ast->audio_framesize+y*ast->coded_framesize, ast->coded_framesize) <= 0)

  726.                         return AVERROR(EIO);

  727.             rm->audio_stream_num = 0;

  728.             rm->audio_pkt_cnt = ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - 1;

  729.             // Release first audio packet

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

  731.             memcpy(pkt->data, ast->pkt.data, st->codec->block_align); //FIXME avoid this

  732.             pkt->flags |= PKT_FLAG_KEY; // Mark first packet as keyframe

  733.             pkt->stream_index = 0;

  734.         } else {

  735.             /* just read raw bytes */

  736.             len = RAW_PACKET_SIZE;

  737.             len= av_get_packet(pb, pkt, len);

  738.             pkt->stream_index = 0;

  739.             if (len <= 0) {

  740.                 return AVERROR(EIO);

  741.             }

  742.             pkt->size = len;

  743.         }

  744.         rm_ac3_swap_bytes(st, pkt);

  745.     } else {

  746.         int seq=1;

  747. resync:

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

  749.         if(len<0)

  750.             return AVERROR(EIO);

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

  752. 

  753.         if (ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,

  754.                                 &seq, &flags, &timestamp) < 0)

  755.             goto resync;

  756. 

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

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

  759.     }

  760. 

  761.     return 0;

  762. }

  763. 

  764. static int rm_read_close(AVFormatContext *s)

  765. {

  766.     int i;

  767. 

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

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

  770. 

  771.     return 0;

  772. }

  773. 

  774. static int rm_probe(AVProbeData *p)

  775. {

  776.     /* check file header */

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

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

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

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

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

  782.         return AVPROBE_SCORE_MAX;

  783.     else

  784.         return 0;

  785. }

  786. 

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

  788.                                int64_t *ppos, int64_t pos_limit)

  789. {

  790.     RMDemuxContext *rm = s->priv_data;

  791.     int64_t pos, dts;

  792.     int stream_index2, flags, len, h;

  793. 

  794.     pos = *ppos;

  795. 

  796.     if(rm->old_format)

  797.         return AV_NOPTS_VALUE;

  798. 

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

  800.     rm->remaining_len=0;

  801.     for(;;){

  802.         int seq=1;

  803.         AVStream *st;

  804. 

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

  806.         if(len<0)

  807.             return AV_NOPTS_VALUE;

  808. 

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

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

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

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

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

  814.             }

  815.         }

  816. 

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

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

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

  820.             if(stream_index2 == stream_index)

  821.                 break;

  822.         }

  823. 

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

  825.     }

  826.     *ppos = pos;

  827.     return dts;

  828. }

  829. 

  830. AVInputFormat rm_demuxer = {

  831.     "rm",

  832.     NULL_IF_CONFIG_SMALL("RealMedia format"),

  833.     sizeof(RMDemuxContext),

  834.     rm_probe,

  835.     rm_read_header,

  836.     rm_read_packet,

  837.     rm_read_close,

  838.     NULL,

  839.     rm_read_dts,

  840. };

  841. 

  842. AVInputFormat rdt_demuxer = {

  843.     "rdt",

  844.     NULL_IF_CONFIG_SMALL("RDT demuxer"),

  845.     sizeof(RMDemuxContext),

  846.     NULL,

  847.     NULL,

  848.     NULL,

  849.     rm_read_close,

  850. };