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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. #include "avformat.h"

  22. #include "rm.h"

  23. #include "avstring.h"

  24. 

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

  26. {

  27.     int i;

  28.     char *q, r;

  29. 

  30.     q = buf;

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

  32.         r = get_byte(pb);

  33.         if (i < buf_size - 1)

  34.             *q++ = r;

  35.     }

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

  37. }

  38. 

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

  40. {

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

  42. }

  43. 

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

  45. {

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

  47. }

  48. 

  49. static int rm_read_audio_stream_info(AVFormatContext *s, AVStream *st,

  50.                                       int read_all)

  51. {

  52.     RMContext *rm = s->priv_data;

  53.     ByteIOContext *pb = &s->pb;

  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"))) {

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

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

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

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

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

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

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

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

  148. 

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

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

  151.                 return -1;

  152.             }

  153. 

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

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

  156.             int codecdata_length, i;

  157.             get_be16(pb); get_byte(pb);

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

  159.                 get_byte(pb);

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

  161.             codecdata_length = get_be32(pb);

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

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

  164.                 return -1;

  165.             }

  166.             if (codecdata_length >= 1) {

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

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

  169.                 get_byte(pb);

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

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

  172.             }

  173.         } else {

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

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

  176.         }

  177.         if (read_all) {

  178.             get_byte(pb);

  179.             get_byte(pb);

  180.             get_byte(pb);

  181. 

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

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

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

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

  186.         }

  187.     }

  188.     return 0;

  189. }

  190. 

  191. static int

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

  193. {

  194.     ByteIOContext *pb = &s->pb;

  195.     unsigned int v;

  196.     int codec_data_size, size, res = -1;

  197.     int64_t codec_pos;

  198. 

  199.     codec_data_size = get_be32(pb);

  200.     codec_pos = url_ftell(pb);

  201.     v = get_be32(pb);

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

  203.         /* ra type header */

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

  205.             return -1;

  206.     } else {

  207.         int fps, fps2;

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

  209.         fail1:

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

  211.             goto skip;

  212.         }

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

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

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

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

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

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

  219.             goto fail1;

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

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

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

  223.         fps= get_be16(pb);

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

  225.         get_be32(pb);

  226.         fps2= get_be16(pb);

  227.         get_be16(pb);

  228. 

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

  230. 

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

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

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

  234.             return -1;

  235.         }

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

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

  238. 

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

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

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

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

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

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

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

  246.         default: goto fail1;

  247.         }

  248.     }

  249. 

  250.     res = 0;

  251. skip:

  252.     /* skip codec info */

  253.     size = url_ftell(pb) - codec_pos;

  254.     url_fskip(pb, codec_data_size - size);

  255. 

  256.     return res;

  257. }

  258. 

  259. 

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

  261. {

  262.     RMContext *rm = s->priv_data;

  263.     AVStream *st;

  264. 

  265.     rm->old_format = 1;

  266.     st = av_new_stream(s, 0);

  267.     if (!st)

  268.         return -1;

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

  270. }

  271. 

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

  273. {

  274.     RMContext *rm = s->priv_data;

  275.     AVStream *st;

  276.     ByteIOContext *pb = &s->pb;

  277.     unsigned int tag;

  278.     int tag_size, i;

  279.     unsigned int start_time, duration;

  280.     char buf[128];

  281.     int flags = 0;

  282. 

  283.     tag = get_le32(pb);

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

  285.         /* very old .ra format */

  286.         return rm_read_header_old(s, ap);

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

  288.         return AVERROR(EIO);

  289.     }

  290. 

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

  292.     get_be16(pb);

  293.     get_be32(pb);

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

  295. 

  296.     for(;;) {

  297.         if (url_feof(pb))

  298.             goto fail;

  299.         tag = get_le32(pb);

  300.         tag_size = get_be32(pb);

  301.         get_be16(pb);

  302. #if 0

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

  304.                (tag) & 0xff,

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

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

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

  308.                tag,

  309.                tag_size);

  310. #endif

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

  312.             goto fail;

  313.         switch(tag) {

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

  315.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

  327.             break;

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

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

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

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

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

  333.             break;

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

  335.             st = av_new_stream(s, 0);

  336.             if (!st)

  337.                 goto fail;

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

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

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

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

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

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

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

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

  346.             st->start_time = start_time;

  347.             st->duration = duration;

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

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

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

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

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

  353.                 return -1;

  354.             break;

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

  356.             goto header_end;

  357.         default:

  358.             /* unknown tag: skip it */

  359.             url_fskip(pb, tag_size - 10);

  360.             break;

  361.         }

  362.     }

  363.  header_end:

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

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

  366.         rm->nb_packets = 3600 * 25;

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

  368.     rm->curpic_num = -1;

  369.     return 0;

  370. 

  371.  fail:

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

  373.         av_free(s->streams[i]);

  374.     }

  375.     return AVERROR(EIO);

  376. }

  377. 

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

  379. {

  380.     int n, n1;

  381. 

  382.     n = get_be16(pb);

  383.     (*len)-=2;

  384. //    n &= 0x7FFF;

  385.     if (n >= 0x4000) {

  386.         return n - 0x4000;

  387.     } else {

  388.         n1 = get_be16(pb);

  389.         (*len)-=2;

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

  391.     }

  392. }

  393. 

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

  395. #define RAW_PACKET_SIZE 1000

  396. 

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

  398.     RMContext *rm = s->priv_data;

  399.     ByteIOContext *pb = &s->pb;

  400.     int len, num, res, i;

  401.     AVStream *st;

  402.     uint32_t state=0xFFFFFFFF;

  403. 

  404.     while(!url_feof(pb)){

  405.         *pos= url_ftell(pb);

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

  407.             num= rm->current_stream;

  408.             len= rm->remaining_len;

  409.             *timestamp = AV_NOPTS_VALUE;

  410.             *flags= 0;

  411.         }else{

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

  413. 

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

  415.                 len = get_be16(pb) - 6;

  416.                 if(len<0)

  417.                     continue;

  418.                 goto skip;

  419.             }

  420. 

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

  422.                 continue;

  423.             len=state;

  424.             state= 0xFFFFFFFF;

  425. 

  426.             num = get_be16(pb);

  427.             *timestamp = get_be32(pb);

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

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

  430. 

  431. 

  432.             len -= 12;

  433.         }

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

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

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

  437.                 break;

  438.         }

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

  440. skip:

  441.             /* skip packet if unknown number */

  442.             url_fskip(pb, len);

  443.             rm->remaining_len -= len;

  444.             continue;

  445.         }

  446.         *stream_index= i;

  447. 

  448.         return len;

  449.     }

  450.     return -1;

  451. }

  452. 

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

  454. {

  455.     ByteIOContext *pb = &s->pb;

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

  457.     int type;

  458.     int ssize;

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

  499.         rm->videobuf = av_realloc(rm->videobuf, ssize);

  500.         rm->videobufsize = ssize;

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

  502.         rm->cur_slice = 0;

  503.         rm->curpic_num = pic_num;

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

  505.     }

  506.     if(type == 2){

  507.         len = FFMIN(len, pos);

  508.         pos = len2 - pos;

  509.     }

  510. 

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

  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.          //adjust slice headers

  524.          memmove(rm->videobuf + 1 + 8*rm->cur_slice, rm->videobuf + 1 + 8*rm->slices, rm->videobufsize - 1 - 8*rm->slices);

  525.          ssize = rm->videobufsize - 8*(rm->slices - rm->cur_slice);

  526. 

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

  528.          if(av_new_packet(pkt, ssize) < 0)

  529.              return AVERROR(ENOMEM);

  530.          memcpy(pkt->data, rm->videobuf, ssize);

  531.          pkt->pts = AV_NOPTS_VALUE;

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

  533.          return 0;

  534.     }

  535. 

  536.     return 1;

  537. }

  538. 

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

  540. {

  541.     RMContext *rm = s->priv_data;

  542.     ByteIOContext *pb = &s->pb;

  543.     AVStream *st;

  544.     int i, len, j;

  545.     int64_t timestamp, pos;

  546.     uint8_t *ptr;

  547.     int flags;

  548. 

  549.     if (rm->audio_pkt_cnt) {

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

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

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

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

  554.         else {

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

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

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

  558.                st->codec->block_align);

  559.         }

  560.         rm->audio_pkt_cnt--;

  561.         pkt->flags = 0;

  562.         pkt->stream_index = rm->audio_stream_num;

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

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

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

  566.             int x, y;

  567. 

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

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

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

  571.                         return AVERROR(EIO);

  572.             rm->audio_stream_num = 0;

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

  574.             // Release first audio packet

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

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

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

  578.             pkt->stream_index = 0;

  579.         } else {

  580.             /* just read raw bytes */

  581.             len = RAW_PACKET_SIZE;

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

  583.             pkt->stream_index = 0;

  584.             if (len <= 0) {

  585.                 return AVERROR(EIO);

  586.             }

  587.             pkt->size = len;

  588.         }

  589.     } else {

  590.         int seq=1;

  591. resync:

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

  593.         if(len<0)

  594.             return AVERROR(EIO);

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

  596. 

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

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

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

  600.                 goto resync;//got partial frame

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

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

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

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

  605.                 int x;

  606.                 int sps = rm->sub_packet_size;

  607.                 int cfs = rm->coded_framesize;

  608.                 int h = rm->sub_packet_h;

  609.                 int y = rm->sub_packet_cnt;

  610.                 int w = rm->audio_framesize;

  611. 

  612.                 if (flags & 2)

  613.                     y = rm->sub_packet_cnt = 0;

  614.                 if (!y)

  615.                     rm->audiotimestamp = timestamp;

  616. 

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

  618.                     case CODEC_ID_RA_288:

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

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

  621.                         break;

  622.                     case CODEC_ID_ATRAC3:

  623.                     case CODEC_ID_COOK:

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

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

  626.                         break;

  627.                 }

  628. 

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

  630.                     goto resync;

  631.                 else {

  632.                     rm->sub_packet_cnt = 0;

  633.                     rm->audio_stream_num = i;

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

  635.                     // Release first audio packet

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

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

  638.                     timestamp = rm->audiotimestamp;

  639.                     flags = 2; // Mark first packet as keyframe

  640.                 }

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

  642.                 int x;

  643.                 rm->audio_stream_num = i;

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

  645.                 if (rm->sub_packet_cnt) {

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

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

  648.                     // Release first audio packet

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

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

  651.                     flags = 2; // Mark first packet as keyframe

  652.                 }

  653.             } else

  654.                 av_get_packet(pb, pkt, len);

  655. 

  656.         } else

  657.             av_get_packet(pb, pkt, len);

  658. 

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

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

  661.             av_free_packet(pkt);

  662.             goto resync;

  663.         }

  664. 

  665.         pkt->stream_index = i;

  666. 

  667. #if 0

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

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

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

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

  672. 

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

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

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

  676.             }

  677.         }

  678. #endif

  679.         pkt->pts= timestamp;

  680.         if(flags&2){

  681.             pkt->flags |= PKT_FLAG_KEY;

  682.             if((seq&0x7F) == 1)

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

  684.         }

  685.     }

  686. 

  687.     /* for AC3, needs to swap bytes */

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

  689.         ptr = pkt->data;

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

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

  692.             ptr += 2;

  693.         }

  694.     }

  695.     return 0;

  696. }

  697. 

  698. static int rm_read_close(AVFormatContext *s)

  699. {

  700.     RMContext *rm = s->priv_data;

  701. 

  702.     av_free(rm->audiobuf);

  703.     av_free(rm->videobuf);

  704.     return 0;

  705. }

  706. 

  707. static int rm_probe(AVProbeData *p)

  708. {

  709.     /* check file header */

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

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

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

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

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

  715.         return AVPROBE_SCORE_MAX;

  716.     else

  717.         return 0;

  718. }

  719. 

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

  721.                                int64_t *ppos, int64_t pos_limit)

  722. {

  723.     RMContext *rm = s->priv_data;

  724.     int64_t pos, dts;

  725.     int stream_index2, flags, len, h;

  726. 

  727.     pos = *ppos;

  728. 

  729.     if(rm->old_format)

  730.         return AV_NOPTS_VALUE;

  731. 

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

  733.     rm->remaining_len=0;

  734.     for(;;){

  735.         int seq=1;

  736.         AVStream *st;

  737. 

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

  739.         if(len<0)

  740.             return AV_NOPTS_VALUE;

  741. 

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

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

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

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

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

  747.             }

  748.         }

  749. 

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

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

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

  753.             if(stream_index2 == stream_index)

  754.                 break;

  755.         }

  756. 

  757.         url_fskip(&s->pb, len);

  758.     }

  759.     *ppos = pos;

  760.     return dts;

  761. }

  762. 

  763. AVInputFormat rm_demuxer = {

  764.     "rm",

  765.     "rm format",

  766.     sizeof(RMContext),

  767.     rm_probe,

  768.     rm_read_header,

  769.     rm_read_packet,

  770.     rm_read_close,

  771.     NULL,

  772.     rm_read_dts,

  773. };