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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. 

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

  297. {

  298.     RMDemuxContext *rm = s->priv_data;

  299.     AVStream *st;

  300. 

  301.     rm->old_format = 1;

  302.     st = av_new_stream(s, 0);

  303.     if (!st)

  304.         return -1;

  305.     st->priv_data = ff_rm_alloc_rmstream();

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

  307. }

  308. 

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

  310. {

  311.     RMDemuxContext *rm = s->priv_data;

  312.     AVStream *st;

  313.     ByteIOContext *pb = s->pb;

  314.     unsigned int tag;

  315.     int tag_size;

  316.     unsigned int start_time, duration;

  317.     char buf[128];

  318.     int flags = 0;

  319. 

  320.     tag = get_le32(pb);

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

  322.         /* very old .ra format */

  323.         return rm_read_header_old(s, ap);

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

  325.         return AVERROR(EIO);

  326.     }

  327. 

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

  329.     get_be16(pb);

  330.     get_be32(pb);

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

  332. 

  333.     for(;;) {

  334.         if (url_feof(pb))

  335.             return -1;

  336.         tag = get_le32(pb);

  337.         tag_size = get_be32(pb);

  338.         get_be16(pb);

  339. #if 0

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

  341.                (tag) & 0xff,

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

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

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

  345.                tag,

  346.                tag_size);

  347. #endif

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

  349.             return -1;

  350.         switch(tag) {

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

  352.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

  364.             break;

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

  366.             rm_read_metadata(s, 1);

  367.             break;

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

  369.             st = av_new_stream(s, 0);

  370.             if (!st)

  371.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  380.             st->start_time = start_time;

  381.             st->duration = duration;

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

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

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

  385.             st->priv_data = ff_rm_alloc_rmstream();

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

  387.                                           get_be32(pb)) < 0)

  388.                 return -1;

  389.             break;

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

  391.             goto header_end;

  392.         default:

  393.             /* unknown tag: skip it */

  394.             url_fskip(pb, tag_size - 10);

  395.             break;

  396.         }

  397.     }

  398.  header_end:

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

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

  401.         rm->nb_packets = 3600 * 25;

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

  403.     return 0;

  404. }

  405. 

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

  407. {

  408.     int n, n1;

  409. 

  410.     n = get_be16(pb);

  411.     (*len)-=2;

  412.     n &= 0x7FFF;

  413.     if (n >= 0x4000) {

  414.         return n - 0x4000;

  415.     } else {

  416.         n1 = get_be16(pb);

  417.         (*len)-=2;

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

  419.     }

  420. }

  421. 

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

  423. #define RAW_PACKET_SIZE 1000

  424. 

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

  426.     RMDemuxContext *rm = s->priv_data;

  427.     ByteIOContext *pb = s->pb;

  428.     int len, num, res, i;

  429.     AVStream *st;

  430.     uint32_t state=0xFFFFFFFF;

  431. 

  432.     while(!url_feof(pb)){

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

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

  435.             num= rm->current_stream;

  436.             len= rm->remaining_len;

  437.             *timestamp = AV_NOPTS_VALUE;

  438.             *flags= 0;

  439.         }else{

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

  441. 

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

  443.                 len = get_be16(pb) - 6;

  444.                 if(len<0)

  445.                     continue;

  446.                 goto skip;

  447.             }

  448. 

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

  450.                 continue;

  451.             len=state;

  452.             state= 0xFFFFFFFF;

  453. 

  454.             num = get_be16(pb);

  455.             *timestamp = get_be32(pb);

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

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

  458. 

  459. 

  460.             len -= 12;

  461.         }

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

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

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

  465.                 break;

  466.         }

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

  468. skip:

  469.             /* skip packet if unknown number */

  470.             url_fskip(pb, len);

  471.             rm->remaining_len -= len;

  472.             continue;

  473.         }

  474.         *stream_index= i;

  475. 

  476.         return len;

  477.     }

  478.     return -1;

  479. }

  480. 

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

  482.                                    RMDemuxContext *rm, RMStream *vst,

  483.                                    AVPacket *pkt, int len)

  484. {

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

  486.     int type;

  487. 

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

  489.     type = hdr >> 6;

  490. 

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

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

  493.     }

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

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

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

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

  498.     }

  499.     if(len<0)

  500.         return -1;

  501.     rm->remaining_len = len;

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

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

  504.             len= len2;

  505.         if(rm->remaining_len < len)

  506.             return -1;

  507.         rm->remaining_len -= len;

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

  509.             return AVERROR(EIO);

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

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

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

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

  514.         return 0;

  515.     }

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

  517. 

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

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

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

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

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

  523.             return AVERROR(ENOMEM);

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

  525.         vst->cur_slice = 0;

  526.         vst->curpic_num = pic_num;

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

  528.     }

  529.     if(type == 2)

  530.         len = FFMIN(len, pos);

  531. 

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

  533.         return 1;

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

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

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

  537.         return 1;

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

  539.         return AVERROR(EIO);

  540.     vst->videobufpos += len;

  541.     rm->remaining_len-= len;

  542. 

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

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

  545.         *pkt= vst->pkt;

  546.         vst->pkt.data= NULL;

  547.         vst->pkt.size= 0;

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

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

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

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

  552.         pkt->pts = AV_NOPTS_VALUE;

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

  554.         return 0;

  555.     }

  556. 

  557.     return 1;

  558. }

  559. 

  560. static inline void

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

  562. {

  563.     uint8_t *ptr;

  564.     int j;

  565. 

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

  567.         ptr = pkt->data;

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

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

  570.             ptr += 2;

  571.         }

  572.     }

  573. }

  574. 

  575. int

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

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

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

  579. {

  580.     RMDemuxContext *rm = s->priv_data;

  581. 

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

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

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

  585.             return -1; //got partial frame

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

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

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

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

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

  591.             int x;

  592.             int sps = ast->sub_packet_size;

  593.             int cfs = ast->coded_framesize;

  594.             int h = ast->sub_packet_h;

  595.             int y = ast->sub_packet_cnt;

  596.             int w = ast->audio_framesize;

  597. 

  598.             if (*flags & 2)

  599.                 y = ast->sub_packet_cnt = 0;

  600.             if (!y)

  601.                 ast->audiotimestamp = *timestamp;

  602. 

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

  604.                 case CODEC_ID_RA_288:

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

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

  607.                     break;

  608.                 case CODEC_ID_ATRAC3:

  609.                 case CODEC_ID_COOK:

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

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

  612.                     break;

  613.             }

  614. 

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

  616.                 return -1;

  617.             else {

  618.                 ast->sub_packet_cnt = 0;

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

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

  621.                 // Release first audio packet

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

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

  624.                 *timestamp = ast->audiotimestamp;

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

  626.             }

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

  628.             int x;

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

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

  631.             if (ast->sub_packet_cnt) {

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

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

  634.                 // Release first audio packet

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

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

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

  638.             }

  639.         } else {

  640.             av_get_packet(pb, pkt, len);

  641.             rm_ac3_swap_bytes(st, pkt);

  642.         }

  643.     } else

  644.         av_get_packet(pb, pkt, len);

  645. 

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

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

  648.         av_free_packet(pkt);

  649.         return -1;

  650.     }

  651. 

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

  653. 

  654. #if 0

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

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

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

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

  659. 

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

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

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

  663.         }

  664.     }

  665. #endif

  666. 

  667.     pkt->pts= *timestamp;

  668.     if (*flags & 2)

  669.         pkt->flags |= PKT_FLAG_KEY;

  670. 

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

  672. }

  673. 

  674. int

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

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

  677. {

  678.     RMDemuxContext *rm = s->priv_data;

  679. 

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

  681. 

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

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

  684.     else {

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

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

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

  688.                st->codec->block_align);

  689.     }

  690.     rm->audio_pkt_cnt--;

  691.     pkt->flags = 0;

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

  693. 

  694.     return rm->audio_pkt_cnt;

  695. }

  696. 

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

  698. {

  699.     RMDemuxContext *rm = s->priv_data;

  700.     ByteIOContext *pb = s->pb;

  701.     AVStream *st;

  702.     int i, len;

  703.     int64_t timestamp, pos;

  704.     int flags;

  705. 

  706.     if (rm->audio_pkt_cnt) {

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

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

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

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

  711.         RMStream *ast;

  712. 

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

  714.         ast = st->priv_data;

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

  716.             int x, y;

  717. 

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

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

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

  721.                         return AVERROR(EIO);

  722.             rm->audio_stream_num = 0;

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

  724.             // Release first audio packet

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

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

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

  728.             pkt->stream_index = 0;

  729.         } else {

  730.             /* just read raw bytes */

  731.             len = RAW_PACKET_SIZE;

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

  733.             pkt->stream_index = 0;

  734.             if (len <= 0) {

  735.                 return AVERROR(EIO);

  736.             }

  737.             pkt->size = len;

  738.         }

  739.         rm_ac3_swap_bytes(st, pkt);

  740.     } else {

  741.         int seq=1;

  742. resync:

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

  744.         if(len<0)

  745.             return AVERROR(EIO);

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

  747. 

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

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

  750.             goto resync;

  751. 

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

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

  754.     }

  755. 

  756.     return 0;

  757. }

  758. 

  759. static int rm_read_close(AVFormatContext *s)

  760. {

  761.     int i;

  762. 

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

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

  765. 

  766.     return 0;

  767. }

  768. 

  769. static int rm_probe(AVProbeData *p)

  770. {

  771.     /* check file header */

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

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

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

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

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

  777.         return AVPROBE_SCORE_MAX;

  778.     else

  779.         return 0;

  780. }

  781. 

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

  783.                                int64_t *ppos, int64_t pos_limit)

  784. {

  785.     RMDemuxContext *rm = s->priv_data;

  786.     int64_t pos, dts;

  787.     int stream_index2, flags, len, h;

  788. 

  789.     pos = *ppos;

  790. 

  791.     if(rm->old_format)

  792.         return AV_NOPTS_VALUE;

  793. 

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

  795.     rm->remaining_len=0;

  796.     for(;;){

  797.         int seq=1;

  798.         AVStream *st;

  799. 

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

  801.         if(len<0)

  802.             return AV_NOPTS_VALUE;

  803. 

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

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

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

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

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

  809.             }

  810.         }

  811. 

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

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

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

  815.             if(stream_index2 == stream_index)

  816.                 break;

  817.         }

  818. 

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

  820.     }

  821.     *ppos = pos;

  822.     return dts;

  823. }

  824. 

  825. AVInputFormat rm_demuxer = {

  826.     "rm",

  827.     NULL_IF_CONFIG_SMALL("RealMedia format"),

  828.     sizeof(RMDemuxContext),

  829.     rm_probe,

  830.     rm_read_header,

  831.     rm_read_packet,

  832.     rm_read_close,

  833.     NULL,

  834.     rm_read_dts,

  835. };

  836. 

  837. AVInputFormat rdt_demuxer = {

  838.     "rdt",

  839.     NULL_IF_CONFIG_SMALL("RDT demuxer"),

  840.     sizeof(RMDemuxContext),

  841.     NULL,

  842.     NULL,

  843.     NULL,

  844.     rm_read_close,

  845. };