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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 "avformat.h"

  24. #include "rm.h"

  25. 

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

  27. {

  28.     int i;

  29.     char *q, r;

  30. 

  31.     q = buf;

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

  33.         r = get_byte(pb);

  34.         if (i < buf_size - 1)

  35.             *q++ = r;

  36.     }

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

  38. }

  39. 

  40. static void get_str16(ByteIOContext *pb, char *buf, int buf_size)

  41. {

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

  43. }

  44. 

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

  46. {

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

  48. }

  49. 

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

  51.                                      AVStream *st, int read_all)

  52. {

  53.     RMContext *rm = s->priv_data;

  54.     char buf[256];

  55.     uint32_t version;

  56.     int i;

  57. 

  58.     /* ra type header */

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

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

  61.         int64_t startpos = url_ftell(pb);

  62.         /* very old version */

  63.         for(i = 0; i < 14; i++)

  64.             get_byte(pb);

  65.         get_str8(pb, s->title, sizeof(s->title));

  66.         get_str8(pb, s->author, sizeof(s->author));

  67.         get_str8(pb, s->copyright, sizeof(s->copyright));

  68.         get_str8(pb, s->comment, sizeof(s->comment));

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

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

  71.             get_byte(pb);

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

  73.         }

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

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

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

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

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

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

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

  81.     } else {

  82.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  83.         /* old version (4) */

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

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

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

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

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

  89.         rm->coded_framesize = coded_framesize = get_be32(pb); /* coded frame size */

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

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

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

  93.         rm->sub_packet_h = sub_packet_h = get_be16(pb); /* 1 */

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

  95.         rm->sub_packet_size = sub_packet_size = get_be16(pb); /* sub packet size */

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

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

  98.             get_be16(pb); get_be16(pb); get_be16(pb); }

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

  100.         get_be32(pb);

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

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

  103.             get_be32(pb);

  104.             buf[0] = get_byte(pb);

  105.             buf[1] = get_byte(pb);

  106.             buf[2] = get_byte(pb);

  107.             buf[3] = get_byte(pb);

  108.             buf[4] = 0;

  109.         } else {

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

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

  112.         }

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

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

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

  116.             st->need_parsing = AVSTREAM_PARSE_FULL;

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

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

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

  120.             rm->audio_framesize = st->codec->block_align;

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

  122. 

  123.             if(rm->audio_framesize >= UINT_MAX / sub_packet_h){

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

  125.                 return -1;

  126.             }

  127. 

  128.             rm->audiobuf = av_malloc(rm->audio_framesize * sub_packet_h);

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

  130.             int codecdata_length, i;

  131.             get_be16(pb); get_byte(pb);

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

  133.                 get_byte(pb);

  134.             codecdata_length = get_be32(pb);

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

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

  137.                 return -1;

  138.             }

  139. 

  140.             if(sub_packet_size <= 0){

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

  142.                 return -1;

  143.             }

  144. 

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

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

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

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

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

  150.             for(i = 0; i < codecdata_length; i++)

  151.                 ((uint8_t*)st->codec->extradata)[i] = get_byte(pb);

  152.             rm->audio_framesize = st->codec->block_align;

  153.             st->codec->block_align = rm->sub_packet_size;

  154. 

  155.             if(rm->audio_framesize >= UINT_MAX / sub_packet_h){

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

  157.                 return -1;

  158.             }

  159. 

  160.             rm->audiobuf = av_malloc(rm->audio_framesize * sub_packet_h);

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

  162.             int codecdata_length, i;

  163.             get_be16(pb); get_byte(pb);

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

  165.                 get_byte(pb);

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

  167.             codecdata_length = get_be32(pb);

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

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

  170.                 return -1;

  171.             }

  172.             if (codecdata_length >= 1) {

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

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

  175.                 get_byte(pb);

  176.                 for(i = 0; i < st->codec->extradata_size; i++)

  177.                     ((uint8_t*)st->codec->extradata)[i] = get_byte(pb);

  178.             }

  179.         } else {

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

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

  182.         }

  183.         if (read_all) {

  184.             get_byte(pb);

  185.             get_byte(pb);

  186.             get_byte(pb);

  187. 

  188.             get_str8(pb, s->title, sizeof(s->title));

  189.             get_str8(pb, s->author, sizeof(s->author));

  190.             get_str8(pb, s->copyright, sizeof(s->copyright));

  191.             get_str8(pb, s->comment, sizeof(s->comment));

  192.         }

  193.     }

  194.     return 0;

  195. }

  196. 

  197. int

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

  199.                            AVStream *st, int codec_data_size)

  200. {

  201.     unsigned int v;

  202.     int size;

  203.     int64_t codec_pos;

  204. 

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

  206.     codec_pos = url_ftell(pb);

  207.     v = get_be32(pb);

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

  209.         /* ra type header */

  210.         if (rm_read_audio_stream_info(s, pb, st, 0))

  211.             return -1;

  212.     } else {

  213.         int fps, fps2;

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

  215.         fail1:

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

  217.             goto skip;

  218.         }

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

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

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

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

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

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

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

  226.             goto fail1;

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

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

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

  230.         fps= get_be16(pb);

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

  232.         get_be32(pb);

  233.         fps2= get_be16(pb);

  234.         get_be16(pb);

  235. 

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

  237. 

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

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

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

  241.             return -1;

  242.         }

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

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

  245.             return AVERROR(ENOMEM);

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

  247. 

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

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

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

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

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

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

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

  255.         default: goto fail1;

  256.         }

  257.     }

  258. 

  259. skip:

  260.     /* skip codec info */

  261.     size = url_ftell(pb) - codec_pos;

  262.     url_fskip(pb, codec_data_size - size);

  263. 

  264.     return 0;

  265. }

  266. 

  267. 

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

  269. {

  270.     RMContext *rm = s->priv_data;

  271.     AVStream *st;

  272. 

  273.     rm->old_format = 1;

  274.     st = av_new_stream(s, 0);

  275.     if (!st)

  276.         return -1;

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

  278. }

  279. 

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

  281. {

  282.     RMContext *rm = s->priv_data;

  283.     AVStream *st;

  284.     ByteIOContext *pb = s->pb;

  285.     unsigned int tag;

  286.     int tag_size;

  287.     unsigned int start_time, duration;

  288.     char buf[128];

  289.     int flags = 0;

  290. 

  291.     tag = get_le32(pb);

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

  293.         /* very old .ra format */

  294.         return rm_read_header_old(s, ap);

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

  296.         return AVERROR(EIO);

  297.     }

  298. 

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

  300.     get_be16(pb);

  301.     get_be32(pb);

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

  303. 

  304.     for(;;) {

  305.         if (url_feof(pb))

  306.             return -1;

  307.         tag = get_le32(pb);

  308.         tag_size = get_be32(pb);

  309.         get_be16(pb);

  310. #if 0

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

  312.                (tag) & 0xff,

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

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

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

  316.                tag,

  317.                tag_size);

  318. #endif

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

  320.             return -1;

  321.         switch(tag) {

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

  323.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

  335.             break;

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

  337.             get_str16(pb, s->title, sizeof(s->title));

  338.             get_str16(pb, s->author, sizeof(s->author));

  339.             get_str16(pb, s->copyright, sizeof(s->copyright));

  340.             get_str16(pb, s->comment, sizeof(s->comment));

  341.             break;

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

  343.             st = av_new_stream(s, 0);

  344.             if (!st)

  345.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  354.             st->start_time = start_time;

  355.             st->duration = duration;

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

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

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

  359.             if (ff_rm_read_mdpr_codecdata(s, s->pb, st, get_be32(pb)) < 0)

  360.                 return -1;

  361.             break;

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

  363.             goto header_end;

  364.         default:

  365.             /* unknown tag: skip it */

  366.             url_fskip(pb, tag_size - 10);

  367.             break;

  368.         }

  369.     }

  370.  header_end:

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

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

  373.         rm->nb_packets = 3600 * 25;

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

  375.     rm->curpic_num = -1;

  376.     return 0;

  377. }

  378. 

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

  380. {

  381.     int n, n1;

  382. 

  383.     n = get_be16(pb);

  384.     (*len)-=2;

  385.     n &= 0x7FFF;

  386.     if (n >= 0x4000) {

  387.         return n - 0x4000;

  388.     } else {

  389.         n1 = get_be16(pb);

  390.         (*len)-=2;

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

  392.     }

  393. }

  394. 

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

  396. #define RAW_PACKET_SIZE 1000

  397. 

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

  399.     RMContext *rm = s->priv_data;

  400.     ByteIOContext *pb = s->pb;

  401.     int len, num, res, i;

  402.     AVStream *st;

  403.     uint32_t state=0xFFFFFFFF;

  404. 

  405.     while(!url_feof(pb)){

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

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

  408.             num= rm->current_stream;

  409.             len= rm->remaining_len;

  410.             *timestamp = AV_NOPTS_VALUE;

  411.             *flags= 0;

  412.         }else{

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

  414. 

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

  416.                 len = get_be16(pb) - 6;

  417.                 if(len<0)

  418.                     continue;

  419.                 goto skip;

  420.             }

  421. 

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

  423.                 continue;

  424.             len=state;

  425.             state= 0xFFFFFFFF;

  426. 

  427.             num = get_be16(pb);

  428.             *timestamp = get_be32(pb);

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

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

  431. 

  432. 

  433.             len -= 12;

  434.         }

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

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

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

  438.                 break;

  439.         }

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

  441. skip:

  442.             /* skip packet if unknown number */

  443.             url_fskip(pb, len);

  444.             rm->remaining_len -= len;

  445.             continue;

  446.         }

  447.         *stream_index= i;

  448. 

  449.         return len;

  450.     }

  451.     return -1;

  452. }

  453. 

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

  455.                                    RMContext *rm, AVPacket *pkt, int len)

  456. {

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

  458.     int type;

  459. 

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

  461.     type = hdr >> 6;

  462.     switch(type){

  463.     case 0: // slice

  464.     case 2: // last slice

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

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

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

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

  469.         rm->remaining_len = len;

  470.         break;

  471.     case 1: //whole frame

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

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

  474.             return AVERROR(EIO);

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

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

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

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

  479.         rm->remaining_len = 0;

  480.         return 0;

  481.     case 3: //frame as a part of packet

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

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

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

  485.         rm->remaining_len = len - len2;

  486.         if(av_new_packet(pkt, len2 + 9) < 0)

  487.             return AVERROR(EIO);

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

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

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

  491.         get_buffer(pb, pkt->data + 9, len2);

  492.         return 0;

  493.     }

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

  495. 

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

  497.         rm->slices = ((hdr & 0x3F) << 1) + 1;

  498.         rm->videobufsize = len2 + 8*rm->slices + 1;

  499.         av_free(rm->videobuf);

  500.         if(!(rm->videobuf = av_malloc(rm->videobufsize)))

  501.             return AVERROR(ENOMEM);

  502.         rm->videobufpos = 8*rm->slices + 1;

  503.         rm->cur_slice = 0;

  504.         rm->curpic_num = pic_num;

  505.         rm->pktpos = url_ftell(pb);

  506.     }

  507.     if(type == 2)

  508.         len = FFMIN(len, pos);

  509. 

  510.     if(++rm->cur_slice > rm->slices)

  511.         return 1;

  512.     AV_WL32(rm->videobuf - 7 + 8*rm->cur_slice, 1);

  513.     AV_WL32(rm->videobuf - 3 + 8*rm->cur_slice, rm->videobufpos - 8*rm->slices - 1);

  514.     if(rm->videobufpos + len > rm->videobufsize)

  515.         return 1;

  516.     if (get_buffer(pb, rm->videobuf + rm->videobufpos, len) != len)

  517.         return AVERROR(EIO);

  518.     rm->videobufpos += len;

  519.     rm->remaining_len-= len;

  520. 

  521.     if(type == 2 || (rm->videobufpos) == rm->videobufsize){

  522.          rm->videobuf[0] = rm->cur_slice-1;

  523.          if(av_new_packet(pkt, rm->videobufpos - 8*(rm->slices - rm->cur_slice)) < 0)

  524.              return AVERROR(ENOMEM);

  525.          memcpy(pkt->data, rm->videobuf, 1 + 8*rm->cur_slice);

  526.          memcpy(pkt->data + 1 + 8*rm->cur_slice, rm->videobuf + 1 + 8*rm->slices,

  527.                 rm->videobufpos - 1 - 8*rm->slices);

  528.          pkt->pts = AV_NOPTS_VALUE;

  529.          pkt->pos = rm->pktpos;

  530.          return 0;

  531.     }

  532. 

  533.     return 1;

  534. }

  535. 

  536. static inline void

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

  538. {

  539.     uint8_t *ptr;

  540.     int j;

  541. 

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

  543.         ptr = pkt->data;

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

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

  546.             ptr += 2;

  547.         }

  548.     }

  549. }

  550. 

  551. int

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

  553.                     AVStream *st, int len, AVPacket *pkt,

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

  555. {

  556.     RMContext *rm = s->priv_data;

  557. 

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

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

  560.         if(rm_assemble_video_frame(s, pb, rm, pkt, len) == 1)

  561.             return -1; //got partial frame

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

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

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

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

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

  567.             int x;

  568.             int sps = rm->sub_packet_size;

  569.             int cfs = rm->coded_framesize;

  570.             int h = rm->sub_packet_h;

  571.             int y = rm->sub_packet_cnt;

  572.             int w = rm->audio_framesize;

  573. 

  574.             if (*flags & 2)

  575.                 y = rm->sub_packet_cnt = 0;

  576.             if (!y)

  577.                 rm->audiotimestamp = *timestamp;

  578. 

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

  580.                 case CODEC_ID_RA_288:

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

  582.                         get_buffer(pb, rm->audiobuf+x*2*w+y*cfs, cfs);

  583.                     break;

  584.                 case CODEC_ID_ATRAC3:

  585.                 case CODEC_ID_COOK:

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

  587.                         get_buffer(pb, rm->audiobuf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);

  588.                     break;

  589.             }

  590. 

  591.             if (++(rm->sub_packet_cnt) < h)

  592.                 return -1;

  593.             else {

  594.                 rm->sub_packet_cnt = 0;

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

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

  597.                 // Release first audio packet

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

  599.                 memcpy(pkt->data, rm->audiobuf, st->codec->block_align);

  600.                 *timestamp = rm->audiotimestamp;

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

  602.             }

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

  604.             int x;

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

  606.             rm->sub_packet_cnt = (get_be16(pb) & 0xf0) >> 4;

  607.             if (rm->sub_packet_cnt) {

  608.                 for (x = 0; x < rm->sub_packet_cnt; x++)

  609.                     rm->sub_packet_lengths[x] = get_be16(pb);

  610.                 // Release first audio packet

  611.                 rm->audio_pkt_cnt = rm->sub_packet_cnt - 1;

  612.                 av_get_packet(pb, pkt, rm->sub_packet_lengths[0]);

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

  614.             }

  615.         } else {

  616.             av_get_packet(pb, pkt, len);

  617.             rm_ac3_swap_bytes(st, pkt);

  618.         }

  619.     } else

  620.         av_get_packet(pb, pkt, len);

  621. 

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

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

  624.         av_free_packet(pkt);

  625.         return -1;

  626.     }

  627. 

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

  629. 

  630. #if 0

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

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

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

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

  635. 

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

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

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

  639.         }

  640.     }

  641. #endif

  642. 

  643.     pkt->pts= *timestamp;

  644.     if (*flags & 2)

  645.         pkt->flags |= PKT_FLAG_KEY;

  646. 

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

  648. }

  649. 

  650. void

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

  652.                       AVStream *st, AVPacket *pkt)

  653. {

  654.     RMContext *rm = s->priv_data;

  655. 

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

  657. 

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

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

  660.     else {

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

  662.         memcpy(pkt->data, rm->audiobuf + st->codec->block_align *

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

  664.                st->codec->block_align);

  665.     }

  666.     rm->audio_pkt_cnt--;

  667.     pkt->flags = 0;

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

  669. }

  670. 

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

  672. {

  673.     RMContext *rm = s->priv_data;

  674.     ByteIOContext *pb = s->pb;

  675.     AVStream *st;

  676.     int i, len;

  677.     int64_t timestamp, pos;

  678.     int flags;

  679. 

  680.     if (rm->audio_pkt_cnt) {

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

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

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

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

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

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

  687.             int x, y;

  688. 

  689.             for (y = 0; y < rm->sub_packet_h; y++)

  690.                 for (x = 0; x < rm->sub_packet_h/2; x++)

  691.                     if (get_buffer(pb, rm->audiobuf+x*2*rm->audio_framesize+y*rm->coded_framesize, rm->coded_framesize) <= 0)

  692.                         return AVERROR(EIO);

  693.             rm->audio_stream_num = 0;

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

  695.             // Release first audio packet

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

  697.             memcpy(pkt->data, rm->audiobuf, st->codec->block_align);

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

  699.             pkt->stream_index = 0;

  700.         } else {

  701.             /* just read raw bytes */

  702.             len = RAW_PACKET_SIZE;

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

  704.             pkt->stream_index = 0;

  705.             if (len <= 0) {

  706.                 return AVERROR(EIO);

  707.             }

  708.             pkt->size = len;

  709.         }

  710.         rm_ac3_swap_bytes(st, pkt);

  711.     } else {

  712.         int seq=1;

  713. resync:

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

  715.         if(len<0)

  716.             return AVERROR(EIO);

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

  718. 

  719.         if (ff_rm_parse_packet (s, s->pb, st, len, pkt, &seq, &flags, &timestamp) < 0)

  720.             goto resync;

  721. 

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

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

  724.     }

  725. 

  726.     return 0;

  727. }

  728. 

  729. static int rm_read_close(AVFormatContext *s)

  730. {

  731.     RMContext *rm = s->priv_data;

  732. 

  733.     av_free(rm->audiobuf);

  734.     av_free(rm->videobuf);

  735.     return 0;

  736. }

  737. 

  738. static int rm_probe(AVProbeData *p)

  739. {

  740.     /* check file header */

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

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

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

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

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

  746.         return AVPROBE_SCORE_MAX;

  747.     else

  748.         return 0;

  749. }

  750. 

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

  752.                                int64_t *ppos, int64_t pos_limit)

  753. {

  754.     RMContext *rm = s->priv_data;

  755.     int64_t pos, dts;

  756.     int stream_index2, flags, len, h;

  757. 

  758.     pos = *ppos;

  759. 

  760.     if(rm->old_format)

  761.         return AV_NOPTS_VALUE;

  762. 

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

  764.     rm->remaining_len=0;

  765.     for(;;){

  766.         int seq=1;

  767.         AVStream *st;

  768. 

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

  770.         if(len<0)

  771.             return AV_NOPTS_VALUE;

  772. 

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

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

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

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

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

  778.             }

  779.         }

  780. 

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

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

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

  784.             if(stream_index2 == stream_index)

  785.                 break;

  786.         }

  787. 

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

  789.     }

  790.     *ppos = pos;

  791.     return dts;

  792. }

  793. 

  794. AVInputFormat rm_demuxer = {

  795.     "rm",

  796.     NULL_IF_CONFIG_SMALL("RM format"),

  797.     sizeof(RMContext),

  798.     rm_probe,

  799.     rm_read_header,

  800.     rm_read_packet,

  801.     rm_read_close,

  802.     NULL,

  803.     rm_read_dts,

  804. };

  805. 

  806. AVInputFormat rdt_demuxer = {

  807.     "rdt",

  808.     NULL_IF_CONFIG_SMALL("RDT demuxer"),

  809.     sizeof(RMContext),

  810.     NULL, NULL, NULL, rm_read_close, NULL, NULL

  811. };