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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"))) {

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

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

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

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

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

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

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

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

  149. 

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

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

  152.                 return -1;

  153.             }

  154. 

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

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

  157.             int codecdata_length, i;

  158.             get_be16(pb); get_byte(pb);

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

  160.                 get_byte(pb);

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

  162.             codecdata_length = get_be32(pb);

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

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

  165.                 return -1;

  166.             }

  167.             if (codecdata_length >= 1) {

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

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

  170.                 get_byte(pb);

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

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

  173.             }

  174.         } else {

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

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

  177.         }

  178.         if (read_all) {

  179.             get_byte(pb);

  180.             get_byte(pb);

  181.             get_byte(pb);

  182. 

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

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

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

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

  187.         }

  188.     }

  189.     return 0;

  190. }

  191. 

  192. int

  193. ff_rm_read_mdpr_codecdata (AVFormatContext *s, AVStream *st)

  194. {

  195.     ByteIOContext *pb = s->pb;

  196.     unsigned int v;

  197.     int codec_data_size, size;

  198.     int64_t codec_pos;

  199. 

  200.     codec_data_size = get_be32(pb);

  201.     codec_pos = url_ftell(pb);

  202.     v = get_be32(pb);

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

  204.         /* ra type header */

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

  206.             return -1;

  207.     } else {

  208.         int fps, fps2;

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

  210.         fail1:

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

  212.             goto skip;

  213.         }

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

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

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

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

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

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

  220.             goto fail1;

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

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

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

  224.         fps= get_be16(pb);

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

  226.         get_be32(pb);

  227.         fps2= get_be16(pb);

  228.         get_be16(pb);

  229. 

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

  231. 

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

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

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

  235.             return -1;

  236.         }

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

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

  239.             return AVERROR(ENOMEM);

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

  241. 

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

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

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

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

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

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

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

  249.         default: goto fail1;

  250.         }

  251.     }

  252. 

  253. skip:

  254.     /* skip codec info */

  255.     size = url_ftell(pb) - codec_pos;

  256.     url_fskip(pb, codec_data_size - size);

  257. 

  258.     return 0;

  259. }

  260. 

  261. 

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

  263. {

  264.     RMContext *rm = s->priv_data;

  265.     AVStream *st;

  266. 

  267.     rm->old_format = 1;

  268.     st = av_new_stream(s, 0);

  269.     if (!st)

  270.         return -1;

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

  272. }

  273. 

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

  275. {

  276.     RMContext *rm = s->priv_data;

  277.     AVStream *st;

  278.     ByteIOContext *pb = s->pb;

  279.     unsigned int tag;

  280.     int tag_size;

  281.     unsigned int start_time, duration;

  282.     char buf[128];

  283.     int flags = 0;

  284. 

  285.     tag = get_le32(pb);

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

  287.         /* very old .ra format */

  288.         return rm_read_header_old(s, ap);

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

  290.         return AVERROR(EIO);

  291.     }

  292. 

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

  294.     get_be16(pb);

  295.     get_be32(pb);

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

  297. 

  298.     for(;;) {

  299.         if (url_feof(pb))

  300.             return -1;

  301.         tag = get_le32(pb);

  302.         tag_size = get_be32(pb);

  303.         get_be16(pb);

  304. #if 0

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

  306.                (tag) & 0xff,

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

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

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

  310.                tag,

  311.                tag_size);

  312. #endif

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

  314.             return -1;

  315.         switch(tag) {

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

  317.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

  329.             break;

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

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

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

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

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

  335.             break;

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

  337.             st = av_new_stream(s, 0);

  338.             if (!st)

  339.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  348.             st->start_time = start_time;

  349.             st->duration = duration;

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

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

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

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

  354.             if (ff_rm_read_mdpr_codecdata(s, st) < 0)

  355.                 return -1;

  356.             break;

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

  358.             goto header_end;

  359.         default:

  360.             /* unknown tag: skip it */

  361.             url_fskip(pb, tag_size - 10);

  362.             break;

  363.         }

  364.     }

  365.  header_end:

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

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

  368.         rm->nb_packets = 3600 * 25;

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

  370.     rm->curpic_num = -1;

  371.     return 0;

  372. }

  373. 

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

  375. {

  376.     int n, n1;

  377. 

  378.     n = get_be16(pb);

  379.     (*len)-=2;

  380.     n &= 0x7FFF;

  381.     if (n >= 0x4000) {

  382.         return n - 0x4000;

  383.     } else {

  384.         n1 = get_be16(pb);

  385.         (*len)-=2;

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

  387.     }

  388. }

  389. 

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

  391. #define RAW_PACKET_SIZE 1000

  392. 

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

  394.     RMContext *rm = s->priv_data;

  395.     ByteIOContext *pb = s->pb;

  396.     int len, num, res, i;

  397.     AVStream *st;

  398.     uint32_t state=0xFFFFFFFF;

  399. 

  400.     while(!url_feof(pb)){

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

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

  403.             num= rm->current_stream;

  404.             len= rm->remaining_len;

  405.             *timestamp = AV_NOPTS_VALUE;

  406.             *flags= 0;

  407.         }else{

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

  409. 

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

  411.                 len = get_be16(pb) - 6;

  412.                 if(len<0)

  413.                     continue;

  414.                 goto skip;

  415.             }

  416. 

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

  418.                 continue;

  419.             len=state;

  420.             state= 0xFFFFFFFF;

  421. 

  422.             num = get_be16(pb);

  423.             *timestamp = get_be32(pb);

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

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

  426. 

  427. 

  428.             len -= 12;

  429.         }

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

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

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

  433.                 break;

  434.         }

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

  436. skip:

  437.             /* skip packet if unknown number */

  438.             url_fskip(pb, len);

  439.             rm->remaining_len -= len;

  440.             continue;

  441.         }

  442.         *stream_index= i;

  443. 

  444.         return len;

  445.     }

  446.     return -1;

  447. }

  448. 

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

  450. {

  451.     ByteIOContext *pb = s->pb;

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

  453.     int type;

  454. 

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

  456.     type = hdr >> 6;

  457.     switch(type){

  458.     case 0: // slice

  459.     case 2: // last slice

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

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

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

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

  464.         rm->remaining_len = len;

  465.         break;

  466.     case 1: //whole frame

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

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

  469.             return AVERROR(EIO);

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

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

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

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

  474.         rm->remaining_len = 0;

  475.         return 0;

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

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

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

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

  480.         rm->remaining_len = len - len2;

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

  482.             return AVERROR(EIO);

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

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

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

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

  487.         return 0;

  488.     }

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

  490. 

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

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

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

  494.         av_free(rm->videobuf);

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

  496.             return AVERROR(ENOMEM);

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

  498.         rm->cur_slice = 0;

  499.         rm->curpic_num = pic_num;

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

  501.     }

  502.     if(type == 2)

  503.         len = FFMIN(len, pos);

  504. 

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

  506.         return 1;

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

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

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

  510.         return 1;

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

  512.         return AVERROR(EIO);

  513.     rm->videobufpos += len;

  514.     rm->remaining_len-= len;

  515. 

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

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

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

  519.              return AVERROR(ENOMEM);

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

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

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

  523.          pkt->pts = AV_NOPTS_VALUE;

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

  525.          return 0;

  526.     }

  527. 

  528.     return 1;

  529. }

  530. 

  531. static inline void

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

  533. {

  534.     uint8_t *ptr;

  535.     int j;

  536. 

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

  538.         ptr = pkt->data;

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

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

  541.             ptr += 2;

  542.         }

  543.     }

  544. }

  545. 

  546. int

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

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

  549. {

  550.     ByteIOContext *pb = s->pb;

  551.     RMContext *rm = s->priv_data;

  552. 

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

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

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

  556.             return -1; //got partial frame

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

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

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

  560.             (st->codec->codec_id == CODEC_ID_ATRAC3)) {

  561.             int x;

  562.             int sps = rm->sub_packet_size;

  563.             int cfs = rm->coded_framesize;

  564.             int h = rm->sub_packet_h;

  565.             int y = rm->sub_packet_cnt;

  566.             int w = rm->audio_framesize;

  567. 

  568.             if (*flags & 2)

  569.                 y = rm->sub_packet_cnt = 0;

  570.             if (!y)

  571.                 rm->audiotimestamp = *timestamp;

  572. 

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

  574.                 case CODEC_ID_RA_288:

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

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

  577.                     break;

  578.                 case CODEC_ID_ATRAC3:

  579.                 case CODEC_ID_COOK:

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

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

  582.                     break;

  583.             }

  584. 

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

  586.                 return -1;

  587.             else {

  588.                 rm->sub_packet_cnt = 0;

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

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

  591.                 // Release first audio packet

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

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

  594.                 *timestamp = rm->audiotimestamp;

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

  596.             }

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

  598.             int x;

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

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

  601.             if (rm->sub_packet_cnt) {

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

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

  604.                 // Release first audio packet

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

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

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

  608.             }

  609.         } else {

  610.             av_get_packet(pb, pkt, len);

  611.             rm_ac3_swap_bytes(st, pkt);

  612.         }

  613.     } else

  614.         av_get_packet(pb, pkt, len);

  615. 

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

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

  618.         av_free_packet(pkt);

  619.         return -1;

  620.     }

  621. 

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

  623. 

  624. #if 0

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

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

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

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

  629. 

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

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

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

  633.         }

  634.     }

  635. #endif

  636. 

  637.     pkt->pts= *timestamp;

  638.     if (*flags & 2)

  639.         pkt->flags |= PKT_FLAG_KEY;

  640. 

  641.     return 0;

  642. }

  643. 

  644. void

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

  646. {

  647.     ByteIOContext *pb = s->pb;

  648.     RMContext *rm = s->priv_data;

  649. 

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

  651. 

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

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

  654.     else {

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

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

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

  658.                st->codec->block_align);

  659.     }

  660.     rm->audio_pkt_cnt--;

  661.     pkt->flags = 0;

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

  663. }

  664. 

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

  666. {

  667.     RMContext *rm = s->priv_data;

  668.     ByteIOContext *pb = s->pb;

  669.     AVStream *st;

  670.     int i, len;

  671.     int64_t timestamp, pos;

  672.     int flags;

  673. 

  674.     if (rm->audio_pkt_cnt) {

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

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

  677.         ff_rm_retrieve_cache(s, st, pkt);

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

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

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

  681.             int x, y;

  682. 

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

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

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

  686.                         return AVERROR(EIO);

  687.             rm->audio_stream_num = 0;

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

  689.             // Release first audio packet

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

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

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

  693.             pkt->stream_index = 0;

  694.         } else {

  695.             /* just read raw bytes */

  696.             len = RAW_PACKET_SIZE;

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

  698.             pkt->stream_index = 0;

  699.             if (len <= 0) {

  700.                 return AVERROR(EIO);

  701.             }

  702.             pkt->size = len;

  703.         }

  704.         rm_ac3_swap_bytes(st, pkt);

  705.     } else {

  706.         int seq=1;

  707. resync:

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

  709.         if(len<0)

  710.             return AVERROR(EIO);

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

  712. 

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

  714.             goto resync;

  715. 

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

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

  718.     }

  719. 

  720.     return 0;

  721. }

  722. 

  723. static int rm_read_close(AVFormatContext *s)

  724. {

  725.     RMContext *rm = s->priv_data;

  726. 

  727.     av_free(rm->audiobuf);

  728.     av_free(rm->videobuf);

  729.     return 0;

  730. }

  731. 

  732. static int rm_probe(AVProbeData *p)

  733. {

  734.     /* check file header */

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

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

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

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

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

  740.         return AVPROBE_SCORE_MAX;

  741.     else

  742.         return 0;

  743. }

  744. 

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

  746.                                int64_t *ppos, int64_t pos_limit)

  747. {

  748.     RMContext *rm = s->priv_data;

  749.     int64_t pos, dts;

  750.     int stream_index2, flags, len, h;

  751. 

  752.     pos = *ppos;

  753. 

  754.     if(rm->old_format)

  755.         return AV_NOPTS_VALUE;

  756. 

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

  758.     rm->remaining_len=0;

  759.     for(;;){

  760.         int seq=1;

  761.         AVStream *st;

  762. 

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

  764.         if(len<0)

  765.             return AV_NOPTS_VALUE;

  766. 

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

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

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

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

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

  772.             }

  773.         }

  774. 

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

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

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

  778.             if(stream_index2 == stream_index)

  779.                 break;

  780.         }

  781. 

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

  783.     }

  784.     *ppos = pos;

  785.     return dts;

  786. }

  787. 

  788. AVInputFormat rm_demuxer = {

  789.     "rm",

  790.     NULL_IF_CONFIG_SMALL("RM format"),

  791.     sizeof(RMContext),

  792.     rm_probe,

  793.     rm_read_header,

  794.     rm_read_packet,

  795.     rm_read_close,

  796.     NULL,

  797.     rm_read_dts,

  798. };