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

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

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

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

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

  121. 

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

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

  124.                 return -1;

  125.             }

  126. 

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

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

  129.             int codecdata_length, i;

  130.             get_be16(pb); get_byte(pb);

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

  132.                 get_byte(pb);

  133.             codecdata_length = get_be32(pb);

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

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

  136.                 return -1;

  137.             }

  138. 

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

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

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

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

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

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

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

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

  147. 

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

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

  150.                 return -1;

  151.             }

  152. 

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

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

  155.             int codecdata_length, i;

  156.             get_be16(pb); get_byte(pb);

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

  158.                 get_byte(pb);

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

  160.             codecdata_length = get_be32(pb);

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

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

  163.                 return -1;

  164.             }

  165.             if (codecdata_length >= 1) {

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

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

  168.                 get_byte(pb);

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

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

  171.             }

  172.         } else {

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

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

  175.         }

  176.         if (read_all) {

  177.             get_byte(pb);

  178.             get_byte(pb);

  179.             get_byte(pb);

  180. 

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

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

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

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

  185.         }

  186.     }

  187.     return 0;

  188. }

  189. 

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

  191. {

  192.     RMContext *rm = s->priv_data;

  193.     AVStream *st;

  194. 

  195.     rm->old_format = 1;

  196.     st = av_new_stream(s, 0);

  197.     if (!st)

  198.         return -1;

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

  200. }

  201. 

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

  203. {

  204.     RMContext *rm = s->priv_data;

  205.     AVStream *st;

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

  207.     unsigned int tag, v;

  208.     int tag_size, size, codec_data_size, i;

  209.     int64_t codec_pos;

  210.     unsigned int start_time, duration;

  211.     char buf[128];

  212.     int flags = 0;

  213. 

  214.     tag = get_le32(pb);

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

  216.         /* very old .ra format */

  217.         return rm_read_header_old(s, ap);

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

  219.         return AVERROR(EIO);

  220.     }

  221. 

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

  223.     get_be16(pb);

  224.     get_be32(pb);

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

  226. 

  227.     for(;;) {

  228.         if (url_feof(pb))

  229.             goto fail;

  230.         tag = get_le32(pb);

  231.         tag_size = get_be32(pb);

  232.         get_be16(pb);

  233. #if 0

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

  235.                (tag) & 0xff,

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

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

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

  239.                tag,

  240.                tag_size);

  241. #endif

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

  243.             goto fail;

  244.         switch(tag) {

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

  246.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

  258.             break;

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

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

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

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

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

  264.             break;

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

  266.             st = av_new_stream(s, 0);

  267.             if (!st)

  268.                 goto fail;

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

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

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

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

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

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

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

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

  277.             st->start_time = start_time;

  278.             st->duration = duration;

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

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

  281.             codec_data_size = get_be32(pb);

  282.             codec_pos = url_ftell(pb);

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

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

  285. 

  286.             v = get_be32(pb);

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

  288.                 /* ra type header */

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

  290.                     return -1;

  291.             } else {

  292.                 int fps, fps2;

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

  294.                 fail1:

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

  296.                     goto skip;

  297.                 }

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

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

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

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

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

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

  304.                     goto fail1;

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

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

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

  308.                 fps= get_be16(pb);

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

  310.                 get_be32(pb);

  311.                 fps2= get_be16(pb);

  312.                 get_be16(pb);

  313. 

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

  315. 

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

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

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

  319.                     return -1;

  320.                 }

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

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

  323. 

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

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

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

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

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

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

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

  331.                 default: goto fail1;

  332.                 }

  333.             }

  334. skip:

  335.             /* skip codec info */

  336.             size = url_ftell(pb) - codec_pos;

  337.             url_fskip(pb, codec_data_size - size);

  338.             break;

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

  340.             goto header_end;

  341.         default:

  342.             /* unknown tag: skip it */

  343.             url_fskip(pb, tag_size - 10);

  344.             break;

  345.         }

  346.     }

  347.  header_end:

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

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

  350.         rm->nb_packets = 3600 * 25;

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

  352.     return 0;

  353. 

  354.  fail:

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

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

  357.     }

  358.     return AVERROR(EIO);

  359. }

  360. 

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

  362. {

  363.     int n, n1;

  364. 

  365.     n = get_be16(pb);

  366.     (*len)-=2;

  367.     if (n >= 0x4000) {

  368.         return n - 0x4000;

  369.     } else {

  370.         n1 = get_be16(pb);

  371.         (*len)-=2;

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

  373.     }

  374. }

  375. 

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

  377. #define RAW_PACKET_SIZE 1000

  378. 

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

  380.     RMContext *rm = s->priv_data;

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

  382.     int len, num, res, i;

  383.     AVStream *st;

  384.     uint32_t state=0xFFFFFFFF;

  385. 

  386.     while(!url_feof(pb)){

  387.         *pos= url_ftell(pb);

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

  389.             num= rm->current_stream;

  390.             len= rm->remaining_len;

  391.             *timestamp = AV_NOPTS_VALUE;

  392.             *flags= 0;

  393.         }else{

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

  395. 

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

  397.                 len = get_be16(pb) - 6;

  398.                 if(len<0)

  399.                     continue;

  400.                 goto skip;

  401.             }

  402. 

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

  404.                 continue;

  405.             len=state;

  406.             state= 0xFFFFFFFF;

  407. 

  408.             num = get_be16(pb);

  409.             *timestamp = get_be32(pb);

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

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

  412. 

  413. 

  414.             len -= 12;

  415.         }

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

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

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

  419.                 break;

  420.         }

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

  422. skip:

  423.             /* skip packet if unknown number */

  424.             url_fskip(pb, len);

  425.             rm->remaining_len -= len;

  426.             continue;

  427.         }

  428.         *stream_index= i;

  429. 

  430.         return len;

  431.     }

  432.     return -1;

  433. }

  434. 

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

  436. {

  437.     RMContext *rm = s->priv_data;

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

  439.     AVStream *st;

  440.     int i, len, j;

  441.     int64_t timestamp, pos;

  442.     uint8_t *ptr;

  443.     int flags;

  444. 

  445.     if (rm->audio_pkt_cnt) {

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

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

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

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

  450.         else {

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

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

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

  454.                st->codec->block_align);

  455.         }

  456.         rm->audio_pkt_cnt--;

  457.         pkt->flags = 0;

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

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

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

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

  462.             int x, y;

  463. 

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

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

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

  467.                         return AVERROR(EIO);

  468.             rm->audio_stream_num = 0;

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

  470.             // Release first audio packet

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

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

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

  474.             pkt->stream_index = 0;

  475.         } else {

  476.             /* just read raw bytes */

  477.             len = RAW_PACKET_SIZE;

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

  479.             pkt->stream_index = 0;

  480.             if (len <= 0) {

  481.                 return AVERROR(EIO);

  482.             }

  483.             pkt->size = len;

  484.         }

  485.     } else {

  486.         int seq=1;

  487. resync:

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

  489.         if(len<0)

  490.             return AVERROR(EIO);

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

  492. 

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

  494.             int h, pic_num, len2, pos;

  495. 

  496.             h= get_byte(pb); len--;

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

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

  499.             }

  500. 

  501.             if((h & 0xc0) == 0x40){

  502.                 len2= pos= 0;

  503.             }else{

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

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

  506.             }

  507.             /* picture number */

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

  509.             rm->remaining_len= len;

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

  511. 

  512. //            av_log(NULL, AV_LOG_DEBUG, "%X len:%d pos:%d len2:%d pic_num:%d\n",h, len, pos, len2, pic_num);

  513.             if(len2 && len2<len)

  514.                 len=len2;

  515.             rm->remaining_len-= len;

  516.             av_get_packet(pb, pkt, len);

  517. 

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

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

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

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

  522.                 int x;

  523.                 int sps = rm->sub_packet_size;

  524.                 int cfs = rm->coded_framesize;

  525.                 int h = rm->sub_packet_h;

  526.                 int y = rm->sub_packet_cnt;

  527.                 int w = rm->audio_framesize;

  528. 

  529.                 if (flags & 2)

  530.                     y = rm->sub_packet_cnt = 0;

  531.                 if (!y)

  532.                     rm->audiotimestamp = timestamp;

  533. 

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

  535.                     case CODEC_ID_RA_288:

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

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

  538.                         break;

  539.                     case CODEC_ID_ATRAC3:

  540.                     case CODEC_ID_COOK:

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

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

  543.                         break;

  544.                 }

  545. 

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

  547.                     goto resync;

  548.                 else {

  549.                     rm->sub_packet_cnt = 0;

  550.                     rm->audio_stream_num = i;

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

  552.                     // Release first audio packet

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

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

  555.                     timestamp = rm->audiotimestamp;

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

  557.                 }

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

  559.                 int x;

  560.                 rm->audio_stream_num = i;

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

  562.                 if (rm->sub_packet_cnt) {

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

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

  565.                     // Release first audio packet

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

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

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

  569.                 }

  570.             } else

  571.                 av_get_packet(pb, pkt, len);

  572. 

  573.         } else

  574.             av_get_packet(pb, pkt, len);

  575. 

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

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

  578.             av_free_packet(pkt);

  579.             goto resync;

  580.         }

  581. 

  582.         pkt->stream_index = i;

  583. 

  584. #if 0

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

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

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

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

  589. 

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

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

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

  593.             }

  594.         }

  595. #endif

  596.         pkt->pts= timestamp;

  597.         if(flags&2){

  598.             pkt->flags |= PKT_FLAG_KEY;

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

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

  601.         }

  602.     }

  603. 

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

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

  606.         ptr = pkt->data;

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

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

  609.             ptr += 2;

  610.         }

  611.     }

  612.     return 0;

  613. }

  614. 

  615. static int rm_read_close(AVFormatContext *s)

  616. {

  617.     RMContext *rm = s->priv_data;

  618. 

  619.     av_free(rm->audiobuf);

  620.     return 0;

  621. }

  622. 

  623. static int rm_probe(AVProbeData *p)

  624. {

  625.     /* check file header */

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

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

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

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

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

  631.         return AVPROBE_SCORE_MAX;

  632.     else

  633.         return 0;

  634. }

  635. 

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

  637.                                int64_t *ppos, int64_t pos_limit)

  638. {

  639.     RMContext *rm = s->priv_data;

  640.     int64_t pos, dts;

  641.     int stream_index2, flags, len, h;

  642. 

  643.     pos = *ppos;

  644. 

  645.     if(rm->old_format)

  646.         return AV_NOPTS_VALUE;

  647. 

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

  649.     rm->remaining_len=0;

  650.     for(;;){

  651.         int seq=1;

  652.         AVStream *st;

  653. 

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

  655.         if(len<0)

  656.             return AV_NOPTS_VALUE;

  657. 

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

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

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

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

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

  663.             }

  664.         }

  665. 

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

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

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

  669.             if(stream_index2 == stream_index)

  670.                 break;

  671.         }

  672. 

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

  674.     }

  675.     *ppos = pos;

  676.     return dts;

  677. }

  678. 

  679. AVInputFormat rm_demuxer = {

  680.     "rm",

  681.     "rm format",

  682.     sizeof(RMContext),

  683.     rm_probe,

  684.     rm_read_header,

  685.     rm_read_packet,

  686.     rm_read_close,

  687.     NULL,

  688.     rm_read_dts,

  689. };