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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 rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap)

  192. {

  193.     RMContext *rm = s->priv_data;

  194.     AVStream *st;

  195. 

  196.     rm->old_format = 1;

  197.     st = av_new_stream(s, 0);

  198.     if (!st)

  199.         return -1;

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

  201. }

  202. 

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

  204. {

  205.     RMContext *rm = s->priv_data;

  206.     AVStream *st;

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

  208.     unsigned int tag, v;

  209.     int tag_size, size, codec_data_size, i;

  210.     int64_t codec_pos;

  211.     unsigned int start_time, duration;

  212.     char buf[128];

  213.     int flags = 0;

  214. 

  215.     tag = get_le32(pb);

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

  217.         /* very old .ra format */

  218.         return rm_read_header_old(s, ap);

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

  220.         return AVERROR(EIO);

  221.     }

  222. 

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

  224.     get_be16(pb);

  225.     get_be32(pb);

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

  227. 

  228.     for(;;) {

  229.         if (url_feof(pb))

  230.             goto fail;

  231.         tag = get_le32(pb);

  232.         tag_size = get_be32(pb);

  233.         get_be16(pb);

  234. #if 0

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

  236.                (tag) & 0xff,

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

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

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

  240.                tag,

  241.                tag_size);

  242. #endif

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

  244.             goto fail;

  245.         switch(tag) {

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

  247.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

  259.             break;

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

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

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

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

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

  265.             break;

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

  267.             st = av_new_stream(s, 0);

  268.             if (!st)

  269.                 goto fail;

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

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

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

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

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

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

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

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

  278.             st->start_time = start_time;

  279.             st->duration = duration;

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

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

  282.             codec_data_size = get_be32(pb);

  283.             codec_pos = url_ftell(pb);

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

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

  286. 

  287.             v = get_be32(pb);

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

  289.                 /* ra type header */

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

  291.                     return -1;

  292.             } else {

  293.                 int fps, fps2;

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

  295.                 fail1:

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

  297.                     goto skip;

  298.                 }

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

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

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

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

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

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

  305.                     goto fail1;

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

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

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

  309.                 fps= get_be16(pb);

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

  311.                 get_be32(pb);

  312.                 fps2= get_be16(pb);

  313.                 get_be16(pb);

  314. 

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

  316. 

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

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

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

  320.                     return -1;

  321.                 }

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

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

  324. 

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

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

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

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

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

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

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

  332.                 default: goto fail1;

  333.                 }

  334.             }

  335. skip:

  336.             /* skip codec info */

  337.             size = url_ftell(pb) - codec_pos;

  338.             url_fskip(pb, codec_data_size - size);

  339.             break;

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

  341.             goto header_end;

  342.         default:

  343.             /* unknown tag: skip it */

  344.             url_fskip(pb, tag_size - 10);

  345.             break;

  346.         }

  347.     }

  348.  header_end:

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

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

  351.         rm->nb_packets = 3600 * 25;

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

  353.     rm->curpic_num = -1;

  354.     return 0;

  355. 

  356.  fail:

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

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

  359.     }

  360.     return AVERROR(EIO);

  361. }

  362. 

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

  364. {

  365.     int n, n1;

  366. 

  367.     n = get_be16(pb);

  368.     (*len)-=2;

  369. //    n &= 0x7FFF;

  370.     if (n >= 0x4000) {

  371.         return n - 0x4000;

  372.     } else {

  373.         n1 = get_be16(pb);

  374.         (*len)-=2;

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

  376.     }

  377. }

  378. 

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

  380. #define RAW_PACKET_SIZE 1000

  381. 

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

  383.     RMContext *rm = s->priv_data;

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

  385.     int len, num, res, i;

  386.     AVStream *st;

  387.     uint32_t state=0xFFFFFFFF;

  388. 

  389.     while(!url_feof(pb)){

  390.         *pos= url_ftell(pb);

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

  392.             num= rm->current_stream;

  393.             len= rm->remaining_len;

  394.             *timestamp = AV_NOPTS_VALUE;

  395.             *flags= 0;

  396.         }else{

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

  398. 

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

  400.                 len = get_be16(pb) - 6;

  401.                 if(len<0)

  402.                     continue;

  403.                 goto skip;

  404.             }

  405. 

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

  407.                 continue;

  408.             len=state;

  409.             state= 0xFFFFFFFF;

  410. 

  411.             num = get_be16(pb);

  412.             *timestamp = get_be32(pb);

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

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

  415. 

  416. 

  417.             len -= 12;

  418.         }

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

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

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

  422.                 break;

  423.         }

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

  425. skip:

  426.             /* skip packet if unknown number */

  427.             url_fskip(pb, len);

  428.             rm->remaining_len -= len;

  429.             continue;

  430.         }

  431.         *stream_index= i;

  432. 

  433.         return len;

  434.     }

  435.     return -1;

  436. }

  437. 

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

  439. {

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

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

  442.     int type;

  443.     int ssize;

  444. 

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

  446.     type = hdr >> 6;

  447.     switch(type){

  448.     case 0: // slice

  449.     case 2: // last slice

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

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

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

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

  454.         rm->remaining_len = len;

  455.         break;

  456.     case 1: //whole frame

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

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

  459.             return AVERROR(EIO);

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

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

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

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

  464.         rm->remaining_len = 0;

  465.         return 0;

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

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

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

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

  470.         rm->remaining_len = len - len2;

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

  472.             return AVERROR(EIO);

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

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

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

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

  477.         return 0;

  478.     }

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

  480. 

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

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

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

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

  485.         rm->videobufsize = ssize;

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

  487.         rm->cur_slice = 0;

  488.         rm->curpic_num = pic_num;

  489.     }

  490.     if(type == 2){

  491.         len = FFMIN(len, pos);

  492.         pos = len2 - pos;

  493.     }

  494. 

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

  496.         return 1;

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

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

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

  500.         return 1;

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

  502.         return AVERROR(EIO);

  503.     rm->videobufpos += len,

  504.     rm->remaining_len-= len;

  505. 

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

  507.          //adjust slice headers

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

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

  510. 

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

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

  513.              return AVERROR(ENOMEM);

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

  515.          return 0;

  516.     }

  517. 

  518.     return 1;

  519. }

  520. 

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

  522. {

  523.     RMContext *rm = s->priv_data;

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

  525.     AVStream *st;

  526.     int i, len, j;

  527.     int64_t timestamp, pos;

  528.     uint8_t *ptr;

  529.     int flags;

  530. 

  531.     if (rm->audio_pkt_cnt) {

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

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

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

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

  536.         else {

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

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

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

  540.                st->codec->block_align);

  541.         }

  542.         rm->audio_pkt_cnt--;

  543.         pkt->flags = 0;

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

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

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

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

  548.             int x, y;

  549. 

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

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

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

  553.                         return AVERROR(EIO);

  554.             rm->audio_stream_num = 0;

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

  556.             // Release first audio packet

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

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

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

  560.             pkt->stream_index = 0;

  561.         } else {

  562.             /* just read raw bytes */

  563.             len = RAW_PACKET_SIZE;

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

  565.             pkt->stream_index = 0;

  566.             if (len <= 0) {

  567.                 return AVERROR(EIO);

  568.             }

  569.             pkt->size = len;

  570.         }

  571.     } else {

  572.         int seq=1;

  573. resync:

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

  575.         if(len<0)

  576.             return AVERROR(EIO);

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

  578. 

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

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

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

  582.                 goto resync;//got partial frame

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

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

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

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

  587.                 int x;

  588.                 int sps = rm->sub_packet_size;

  589.                 int cfs = rm->coded_framesize;

  590.                 int h = rm->sub_packet_h;

  591.                 int y = rm->sub_packet_cnt;

  592.                 int w = rm->audio_framesize;

  593. 

  594.                 if (flags & 2)

  595.                     y = rm->sub_packet_cnt = 0;

  596.                 if (!y)

  597.                     rm->audiotimestamp = timestamp;

  598. 

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

  600.                     case CODEC_ID_RA_288:

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

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

  603.                         break;

  604.                     case CODEC_ID_ATRAC3:

  605.                     case CODEC_ID_COOK:

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

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

  608.                         break;

  609.                 }

  610. 

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

  612.                     goto resync;

  613.                 else {

  614.                     rm->sub_packet_cnt = 0;

  615.                     rm->audio_stream_num = i;

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

  617.                     // Release first audio packet

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

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

  620.                     timestamp = rm->audiotimestamp;

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

  622.                 }

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

  624.                 int x;

  625.                 rm->audio_stream_num = i;

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

  627.                 if (rm->sub_packet_cnt) {

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

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

  630.                     // Release first audio packet

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

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

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

  634.                 }

  635.             } else

  636.                 av_get_packet(pb, pkt, len);

  637. 

  638.         } else

  639.             av_get_packet(pb, pkt, len);

  640. 

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

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

  643.             av_free_packet(pkt);

  644.             goto resync;

  645.         }

  646. 

  647.         pkt->stream_index = i;

  648. 

  649. #if 0

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

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

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

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

  654. 

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

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

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

  658.             }

  659.         }

  660. #endif

  661.         pkt->pts= timestamp;

  662.         if(flags&2){

  663.             pkt->flags |= PKT_FLAG_KEY;

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

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

  666.         }

  667.     }

  668. 

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

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

  671.         ptr = pkt->data;

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

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

  674.             ptr += 2;

  675.         }

  676.     }

  677.     return 0;

  678. }

  679. 

  680. static int rm_read_close(AVFormatContext *s)

  681. {

  682.     RMContext *rm = s->priv_data;

  683. 

  684.     av_free(rm->audiobuf);

  685.     av_free(rm->videobuf);

  686.     return 0;

  687. }

  688. 

  689. static int rm_probe(AVProbeData *p)

  690. {

  691.     /* check file header */

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

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

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

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

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

  697.         return AVPROBE_SCORE_MAX;

  698.     else

  699.         return 0;

  700. }

  701. 

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

  703.                                int64_t *ppos, int64_t pos_limit)

  704. {

  705.     RMContext *rm = s->priv_data;

  706.     int64_t pos, dts;

  707.     int stream_index2, flags, len, h;

  708. 

  709.     pos = *ppos;

  710. 

  711.     if(rm->old_format)

  712.         return AV_NOPTS_VALUE;

  713. 

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

  715.     rm->remaining_len=0;

  716.     for(;;){

  717.         int seq=1;

  718.         AVStream *st;

  719. 

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

  721.         if(len<0)

  722.             return AV_NOPTS_VALUE;

  723. 

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

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

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

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

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

  729.             }

  730.         }

  731. 

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

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

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

  735.             if(stream_index2 == stream_index)

  736.                 break;

  737.         }

  738. 

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

  740.     }

  741.     *ppos = pos;

  742.     return dts;

  743. }

  744. 

  745. AVInputFormat rm_demuxer = {

  746.     "rm",

  747.     "rm format",

  748.     sizeof(RMContext),

  749.     rm_probe,

  750.     rm_read_header,

  751.     rm_read_packet,

  752.     rm_read_close,

  753.     NULL,

  754.     rm_read_dts,

  755. };