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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, AVStream *st,

  51.                                       int read_all)

  52. {

  53.     RMContext *rm = s->priv_data;

  54.     ByteIOContext *pb = s->pb;

  55.     char buf[256];

  56.     uint32_t version;

  57.     int i;

  58. 

  59.     /* ra type header */

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

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

  62.         int64_t startpos = url_ftell(pb);

  63.         /* very old version */

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

  65.             get_byte(pb);

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

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

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

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

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

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

  72.         get_byte(pb);

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

  74.         }

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

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

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

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

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

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

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

  82.     } else {

  83.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  84.         /* old version (4) */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  99.             get_be16(pb); get_be16(pb); get_be16(pb); }

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

  101.         get_be32(pb);

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

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

  104.             get_be32(pb);

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

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

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

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

  109.             buf[4] = 0;

  110.         } else {

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

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

  113.         }

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

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

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

  117.             st->need_parsing = AVSTREAM_PARSE_FULL;

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

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

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

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

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

  123. 

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

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

  126.                 return -1;

  127.             }

  128. 

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

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

  131.             int codecdata_length, i;

  132.             get_be16(pb); get_byte(pb);

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

  134.                 get_byte(pb);

  135.             codecdata_length = get_be32(pb);

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

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

  138.                 return -1;

  139.             }

  140. 

  141.             if(sub_packet_size <= 0){

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

  143.                 return -1;

  144.             }

  145. 

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

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

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

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

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

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

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

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

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

  155. 

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

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

  158.                 return -1;

  159.             }

  160. 

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

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

  163.             int codecdata_length, i;

  164.             get_be16(pb); get_byte(pb);

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

  166.                 get_byte(pb);

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

  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.             if (codecdata_length >= 1) {

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

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

  176.                 get_byte(pb);

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

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

  179.             }

  180.         } else {

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

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

  183.         }

  184.         if (read_all) {

  185.             get_byte(pb);

  186.             get_byte(pb);

  187.             get_byte(pb);

  188. 

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

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

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

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

  193.         }

  194.     }

  195.     return 0;

  196. }

  197. 

  198. int

  199. ff_rm_read_mdpr_codecdata (AVFormatContext *s, AVStream *st, int codec_data_size)

  200. {

  201.     ByteIOContext *pb = s->pb;

  202.     unsigned int v;

  203.     int size;

  204.     int64_t codec_pos;

  205. 

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

  207.     codec_pos = url_ftell(pb);

  208.     v = get_be32(pb);

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

  210.         /* ra type header */

  211.         if (rm_read_audio_stream_info(s, st, 0))

  212.             return -1;

  213.     } else {

  214.         int fps, fps2;

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

  216.         fail1:

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

  218.             goto skip;

  219.         }

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

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

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

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

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

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

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

  227.             goto fail1;

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

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

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

  231.         fps= get_be16(pb);

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

  233.         get_be32(pb);

  234.         fps2= get_be16(pb);

  235.         get_be16(pb);

  236. 

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

  238. 

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

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

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

  242.             return -1;

  243.         }

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

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

  246.             return AVERROR(ENOMEM);

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

  248. 

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

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

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

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

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

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

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

  256.         default: goto fail1;

  257.         }

  258.     }

  259. 

  260. skip:

  261.     /* skip codec info */

  262.     size = url_ftell(pb) - codec_pos;

  263.     url_fskip(pb, codec_data_size - size);

  264. 

  265.     return 0;

  266. }

  267. 

  268. 

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

  270. {

  271.     RMContext *rm = s->priv_data;

  272.     AVStream *st;

  273. 

  274.     rm->old_format = 1;

  275.     st = av_new_stream(s, 0);

  276.     if (!st)

  277.         return -1;

  278.     return rm_read_audio_stream_info(s, st, 1);

  279. }

  280. 

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

  282. {

  283.     RMContext *rm = s->priv_data;

  284.     AVStream *st;

  285.     ByteIOContext *pb = s->pb;

  286.     unsigned int tag;

  287.     int tag_size;

  288.     unsigned int start_time, duration;

  289.     char buf[128];

  290.     int flags = 0;

  291. 

  292.     tag = get_le32(pb);

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

  294.         /* very old .ra format */

  295.         return rm_read_header_old(s, ap);

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

  297.         return AVERROR(EIO);

  298.     }

  299. 

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

  301.     get_be16(pb);

  302.     get_be32(pb);

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

  304. 

  305.     for(;;) {

  306.         if (url_feof(pb))

  307.             return -1;

  308.         tag = get_le32(pb);

  309.         tag_size = get_be32(pb);

  310.         get_be16(pb);

  311. #if 0

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

  313.                (tag) & 0xff,

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

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

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

  317.                tag,

  318.                tag_size);

  319. #endif

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

  321.             return -1;

  322.         switch(tag) {

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

  324.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

  336.             break;

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

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

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

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

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

  342.             break;

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

  344.             st = av_new_stream(s, 0);

  345.             if (!st)

  346.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  355.             st->start_time = start_time;

  356.             st->duration = duration;

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

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

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

  360.             if (ff_rm_read_mdpr_codecdata(s, st, get_be32(pb)) < 0)

  361.                 return -1;

  362.             break;

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

  364.             goto header_end;

  365.         default:

  366.             /* unknown tag: skip it */

  367.             url_fskip(pb, tag_size - 10);

  368.             break;

  369.         }

  370.     }

  371.  header_end:

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

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

  374.         rm->nb_packets = 3600 * 25;

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

  376.     rm->curpic_num = -1;

  377.     return 0;

  378. }

  379. 

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

  381. {

  382.     int n, n1;

  383. 

  384.     n = get_be16(pb);

  385.     (*len)-=2;

  386.     n &= 0x7FFF;

  387.     if (n >= 0x4000) {

  388.         return n - 0x4000;

  389.     } else {

  390.         n1 = get_be16(pb);

  391.         (*len)-=2;

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

  393.     }

  394. }

  395. 

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

  397. #define RAW_PACKET_SIZE 1000

  398. 

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

  400.     RMContext *rm = s->priv_data;

  401.     ByteIOContext *pb = s->pb;

  402.     int len, num, res, i;

  403.     AVStream *st;

  404.     uint32_t state=0xFFFFFFFF;

  405. 

  406.     while(!url_feof(pb)){

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

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

  409.             num= rm->current_stream;

  410.             len= rm->remaining_len;

  411.             *timestamp = AV_NOPTS_VALUE;

  412.             *flags= 0;

  413.         }else{

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

  415. 

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

  417.                 len = get_be16(pb) - 6;

  418.                 if(len<0)

  419.                     continue;

  420.                 goto skip;

  421.             }

  422. 

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

  424.                 continue;

  425.             len=state;

  426.             state= 0xFFFFFFFF;

  427. 

  428.             num = get_be16(pb);

  429.             *timestamp = get_be32(pb);

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

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

  432. 

  433. 

  434.             len -= 12;

  435.         }

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

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

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

  439.                 break;

  440.         }

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

  442. skip:

  443.             /* skip packet if unknown number */

  444.             url_fskip(pb, len);

  445.             rm->remaining_len -= len;

  446.             continue;

  447.         }

  448.         *stream_index= i;

  449. 

  450.         return len;

  451.     }

  452.     return -1;

  453. }

  454. 

  455. static int rm_assemble_video_frame(AVFormatContext *s, RMContext *rm, AVPacket *pkt, int len)

  456. {

  457.     ByteIOContext *pb = s->pb;

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

  459.     int type;

  460. 

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

  462.     type = hdr >> 6;

  463.     switch(type){

  464.     case 0: // slice

  465.     case 2: // last slice

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

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

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

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

  470.         rm->remaining_len = len;

  471.         break;

  472.     case 1: //whole frame

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

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

  475.             return AVERROR(EIO);

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

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

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

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

  480.         rm->remaining_len = 0;

  481.         return 0;

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

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

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

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

  486.         rm->remaining_len = len - len2;

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

  488.             return AVERROR(EIO);

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

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

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

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

  493.         return 0;

  494.     }

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

  496. 

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

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

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

  500.         av_free(rm->videobuf);

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

  502.             return AVERROR(ENOMEM);

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

  504.         rm->cur_slice = 0;

  505.         rm->curpic_num = pic_num;

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

  507.     }

  508.     if(type == 2)

  509.         len = FFMIN(len, pos);

  510. 

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

  512.         return 1;

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

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

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

  516.         return 1;

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

  518.         return AVERROR(EIO);

  519.     rm->videobufpos += len;

  520.     rm->remaining_len-= len;

  521. 

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

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

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

  525.              return AVERROR(ENOMEM);

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

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

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

  529.          pkt->pts = AV_NOPTS_VALUE;

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

  531.          return 0;

  532.     }

  533. 

  534.     return 1;

  535. }

  536. 

  537. static inline void

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

  539. {

  540.     uint8_t *ptr;

  541.     int j;

  542. 

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

  544.         ptr = pkt->data;

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

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

  547.             ptr += 2;

  548.         }

  549.     }

  550. }

  551. 

  552. int

  553. ff_rm_parse_packet (AVFormatContext *s, AVStream *st, int len, AVPacket *pkt,

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

  555. {

  556.     ByteIOContext *pb = s->pb;

  557.     RMContext *rm = s->priv_data;

  558. 

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

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

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

  562.             return -1; //got partial frame

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

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

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

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

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

  568.             int x;

  569.             int sps = rm->sub_packet_size;

  570.             int cfs = rm->coded_framesize;

  571.             int h = rm->sub_packet_h;

  572.             int y = rm->sub_packet_cnt;

  573.             int w = rm->audio_framesize;

  574. 

  575.             if (*flags & 2)

  576.                 y = rm->sub_packet_cnt = 0;

  577.             if (!y)

  578.                 rm->audiotimestamp = *timestamp;

  579. 

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

  581.                 case CODEC_ID_RA_288:

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

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

  584.                     break;

  585.                 case CODEC_ID_ATRAC3:

  586.                 case CODEC_ID_COOK:

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

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

  589.                     break;

  590.             }

  591. 

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

  593.                 return -1;

  594.             else {

  595.                 rm->sub_packet_cnt = 0;

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

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

  598.                 // Release first audio packet

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

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

  601.                 *timestamp = rm->audiotimestamp;

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

  603.             }

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

  605.             int x;

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

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

  608.             if (rm->sub_packet_cnt) {

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

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

  611.                 // Release first audio packet

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

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

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

  615.             }

  616.         } else {

  617.             av_get_packet(pb, pkt, len);

  618.             rm_ac3_swap_bytes(st, pkt);

  619.         }

  620.     } else

  621.         av_get_packet(pb, pkt, len);

  622. 

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

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

  625.         av_free_packet(pkt);

  626.         return -1;

  627.     }

  628. 

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

  630. 

  631. #if 0

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

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

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

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

  636. 

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

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

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

  640.         }

  641.     }

  642. #endif

  643. 

  644.     pkt->pts= *timestamp;

  645.     if (*flags & 2)

  646.         pkt->flags |= PKT_FLAG_KEY;

  647. 

  648.     return 0;

  649. }

  650. 

  651. void

  652. ff_rm_retrieve_cache (AVFormatContext *s, AVStream *st, AVPacket *pkt)

  653. {

  654.     ByteIOContext *pb = s->pb;

  655.     RMContext *rm = s->priv_data;

  656. 

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

  658. 

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

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

  661.     else {

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

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

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

  665.                st->codec->block_align);

  666.     }

  667.     rm->audio_pkt_cnt--;

  668.     pkt->flags = 0;

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

  670. }

  671. 

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

  673. {

  674.     RMContext *rm = s->priv_data;

  675.     ByteIOContext *pb = s->pb;

  676.     AVStream *st;

  677.     int i, len;

  678.     int64_t timestamp, pos;

  679.     int flags;

  680. 

  681.     if (rm->audio_pkt_cnt) {

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

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

  684.         ff_rm_retrieve_cache(s, st, pkt);

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

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

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

  688.             int x, y;

  689. 

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

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

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

  693.                         return AVERROR(EIO);

  694.             rm->audio_stream_num = 0;

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

  696.             // Release first audio packet

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

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

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

  700.             pkt->stream_index = 0;

  701.         } else {

  702.             /* just read raw bytes */

  703.             len = RAW_PACKET_SIZE;

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

  705.             pkt->stream_index = 0;

  706.             if (len <= 0) {

  707.                 return AVERROR(EIO);

  708.             }

  709.             pkt->size = len;

  710.         }

  711.         rm_ac3_swap_bytes(st, pkt);

  712.     } else {

  713.         int seq=1;

  714. resync:

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

  716.         if(len<0)

  717.             return AVERROR(EIO);

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

  719. 

  720.         if (ff_rm_parse_packet (s, st, len, pkt, &seq, &flags, &timestamp) < 0)

  721.             goto resync;

  722. 

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

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

  725.     }

  726. 

  727.     return 0;

  728. }

  729. 

  730. static int rm_read_close(AVFormatContext *s)

  731. {

  732.     RMContext *rm = s->priv_data;

  733. 

  734.     av_free(rm->audiobuf);

  735.     av_free(rm->videobuf);

  736.     return 0;

  737. }

  738. 

  739. static int rm_probe(AVProbeData *p)

  740. {

  741.     /* check file header */

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

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

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

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

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

  747.         return AVPROBE_SCORE_MAX;

  748.     else

  749.         return 0;

  750. }

  751. 

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

  753.                                int64_t *ppos, int64_t pos_limit)

  754. {

  755.     RMContext *rm = s->priv_data;

  756.     int64_t pos, dts;

  757.     int stream_index2, flags, len, h;

  758. 

  759.     pos = *ppos;

  760. 

  761.     if(rm->old_format)

  762.         return AV_NOPTS_VALUE;

  763. 

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

  765.     rm->remaining_len=0;

  766.     for(;;){

  767.         int seq=1;

  768.         AVStream *st;

  769. 

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

  771.         if(len<0)

  772.             return AV_NOPTS_VALUE;

  773. 

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

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

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

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

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

  779.             }

  780.         }

  781. 

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

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

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

  785.             if(stream_index2 == stream_index)

  786.                 break;

  787.         }

  788. 

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

  790.     }

  791.     *ppos = pos;

  792.     return dts;

  793. }

  794. 

  795. AVInputFormat rm_demuxer = {

  796.     "rm",

  797.     NULL_IF_CONFIG_SMALL("RM format"),

  798.     sizeof(RMContext),

  799.     rm_probe,

  800.     rm_read_header,

  801.     rm_read_packet,

  802.     rm_read_close,

  803.     NULL,

  804.     rm_read_dts,

  805. };

  806. 

  807. AVInputFormat rdt_demuxer = {

  808.     "rdt",

  809.     NULL_IF_CONFIG_SMALL("RDT demuxer"),

  810.     sizeof(RMContext),

  811.     NULL, NULL, NULL, rm_read_close, NULL, NULL

  812. };