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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. 

  24. 

  25. static void get_str(ByteIOContext *pb, char *buf, int buf_size)

  26. {

  27.     int len, i;

  28.     char *q;

  29. 

  30.     len = get_be16(pb);

  31.     q = buf;

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

  33.         if (i < buf_size - 1)

  34.             *q++ = get_byte(pb);

  35.     }

  36.     *q = '\0';

  37. }

  38. 

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

  40. {

  41.     int len, i;

  42.     char *q;

  43. 

  44.     len = get_byte(pb);

  45.     q = buf;

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

  47.         if (i < buf_size - 1)

  48.             *q++ = get_byte(pb);

  49.     }

  50.     *q = '\0';

  51. }

  52. 

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

  54.                                       int read_all)

  55. {

  56.     RMContext *rm = s->priv_data;

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

  58.     char buf[256];

  59.     uint32_t version;

  60.     int i;

  61. 

  62.     /* ra type header */

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

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

  65.         int64_t startpos = url_ftell(pb);

  66.         /* very old version */

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

  68.             get_byte(pb);

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

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

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

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

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

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

  75.         get_byte(pb);

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

  77.         }

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

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

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

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

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

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

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

  85.     } else {

  86.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  87.         /* old version (4) */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  102.             get_be16(pb); get_be16(pb); get_be16(pb); }

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

  104.         get_be32(pb);

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

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

  107.             get_be32(pb);

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

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

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

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

  112.             buf[4] = 0;

  113.         } else {

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

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

  116.         }

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

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

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

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

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

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

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

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

  125. 

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

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

  128.                 return -1;

  129.             }

  130. 

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

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

  133.             int codecdata_length, i;

  134.             get_be16(pb); get_byte(pb);

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

  136.                 get_byte(pb);

  137.             codecdata_length = get_be32(pb);

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

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

  140.                 return -1;

  141.             }

  142. 

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

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

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

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

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

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

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

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

  151. 

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

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

  154.                 return -1;

  155.             }

  156. 

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

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

  159.             int codecdata_length, i;

  160.             get_be16(pb); get_byte(pb);

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

  162.                 get_byte(pb);

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

  164.             codecdata_length = get_be32(pb);

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

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

  167.                 return -1;

  168.             }

  169.             if (codecdata_length >= 1) {

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

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

  172.                 get_byte(pb);

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

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

  175.             }

  176.         } else {

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

  178.             pstrcpy(st->codec->codec_name, sizeof(st->codec->codec_name),

  179.                     buf);

  180.         }

  181.         if (read_all) {

  182.             get_byte(pb);

  183.             get_byte(pb);

  184.             get_byte(pb);

  185. 

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

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

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

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

  190.         }

  191.     }

  192.     return 0;

  193. }

  194. 

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

  196. {

  197.     RMContext *rm = s->priv_data;

  198.     AVStream *st;

  199. 

  200.     rm->old_format = 1;

  201.     st = av_new_stream(s, 0);

  202.     if (!st)

  203.         return -1;

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

  205. }

  206. 

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

  208. {

  209.     RMContext *rm = s->priv_data;

  210.     AVStream *st;

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

  212.     unsigned int tag, v;

  213.     int tag_size, size, codec_data_size, i;

  214.     int64_t codec_pos;

  215.     unsigned int start_time, duration;

  216.     char buf[128];

  217.     int flags = 0;

  218. 

  219.     tag = get_le32(pb);

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

  221.         /* very old .ra format */

  222.         return rm_read_header_old(s, ap);

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

  224.         return AVERROR_IO;

  225.     }

  226. 

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

  228.     get_be16(pb);

  229.     get_be32(pb);

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

  231. 

  232.     for(;;) {

  233.         if (url_feof(pb))

  234.             goto fail;

  235.         tag = get_le32(pb);

  236.         tag_size = get_be32(pb);

  237.         get_be16(pb);

  238. #if 0

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

  240.                (tag) & 0xff,

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

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

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

  244.                tag,

  245.                tag_size);

  246. #endif

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

  248.             goto fail;

  249.         switch(tag) {

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

  251.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

  263.             break;

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

  265.             get_str(pb, s->title, sizeof(s->title));

  266.             get_str(pb, s->author, sizeof(s->author));

  267.             get_str(pb, s->copyright, sizeof(s->copyright));

  268.             get_str(pb, s->comment, sizeof(s->comment));

  269.             break;

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

  271.             st = av_new_stream(s, 0);

  272.             if (!st)

  273.                 goto fail;

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

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

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

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

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

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

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

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

  282.             st->start_time = start_time;

  283.             st->duration = duration;

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

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

  286.             codec_data_size = get_be32(pb);

  287.             codec_pos = url_ftell(pb);

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

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

  290. 

  291.             v = get_be32(pb);

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

  293.                 /* ra type header */

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

  295.                     return -1;

  296.             } else {

  297.                 int fps, fps2;

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

  299.                 fail1:

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

  301.                     goto skip;

  302.                 }

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

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

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

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

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

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

  309.                     goto fail1;

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

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

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

  313.                 fps= get_be16(pb);

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

  315.                 get_be32(pb);

  316.                 fps2= get_be16(pb);

  317.                 get_be16(pb);

  318. 

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

  320. 

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

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

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

  324.                     return -1;

  325.                 }

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

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

  328. 

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

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

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

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

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

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

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

  336.                 default: goto fail1;

  337.                 }

  338.             }

  339. skip:

  340.             /* skip codec info */

  341.             size = url_ftell(pb) - codec_pos;

  342.             url_fskip(pb, codec_data_size - size);

  343.             break;

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

  345.             goto header_end;

  346.         default:

  347.             /* unknown tag: skip it */

  348.             url_fskip(pb, tag_size - 10);

  349.             break;

  350.         }

  351.     }

  352.  header_end:

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

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

  355.         rm->nb_packets = 3600 * 25;

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

  357.     return 0;

  358. 

  359.  fail:

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

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

  362.     }

  363.     return AVERROR_IO;

  364. }

  365. 

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

  367. {

  368.     int n, n1;

  369. 

  370.     n = get_be16(pb);

  371.     (*len)-=2;

  372.     if (n >= 0x4000) {

  373.         return n - 0x4000;

  374.     } else {

  375.         n1 = get_be16(pb);

  376.         (*len)-=2;

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

  378.     }

  379. }

  380. 

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

  382. #define RAW_PACKET_SIZE 1000

  383. 

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

  385.     RMContext *rm = s->priv_data;

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

  387.     int len, num, res, i;

  388.     AVStream *st;

  389.     uint32_t state=0xFFFFFFFF;

  390. 

  391.     while(!url_feof(pb)){

  392.         *pos= url_ftell(pb);

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

  394.             num= rm->current_stream;

  395.             len= rm->remaining_len;

  396.             *timestamp = AV_NOPTS_VALUE;

  397.             *flags= 0;

  398.         }else{

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

  400. 

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

  402.                 len = get_be16(pb) - 6;

  403.                 if(len<0)

  404.                     continue;

  405.                 goto skip;

  406.             }

  407. 

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

  409.                 continue;

  410.             len=state;

  411.             state= 0xFFFFFFFF;

  412. 

  413.             num = get_be16(pb);

  414.             *timestamp = get_be32(pb);

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

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

  417. 

  418. 

  419.             len -= 12;

  420.         }

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

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

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

  424.                 break;

  425.         }

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

  427. skip:

  428.             /* skip packet if unknown number */

  429.             url_fskip(pb, len);

  430.             rm->remaining_len -= len;

  431.             continue;

  432.         }

  433.         *stream_index= i;

  434. 

  435.         return len;

  436.     }

  437.     return -1;

  438. }

  439. 

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

  441. {

  442.     RMContext *rm = s->priv_data;

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

  444.     AVStream *st;

  445.     int i, len, j;

  446.     int64_t timestamp, pos;

  447.     uint8_t *ptr;

  448.     int flags;

  449. 

  450.     if (rm->audio_pkt_cnt) {

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

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

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

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

  455.         else {

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

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

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

  459.                st->codec->block_align);

  460.         }

  461.         rm->audio_pkt_cnt--;

  462.         pkt->flags = 0;

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

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

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

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

  467.             int x, y;

  468. 

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

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

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

  472.                         return AVERROR_IO;

  473.             rm->audio_stream_num = 0;

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

  475.             // Release first audio packet

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

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

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

  479.             pkt->stream_index = 0;

  480.         } else {

  481.             /* just read raw bytes */

  482.             len = RAW_PACKET_SIZE;

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

  484.             pkt->stream_index = 0;

  485.             if (len <= 0) {

  486.                 return AVERROR_IO;

  487.             }

  488.             pkt->size = len;

  489.         }

  490.     } else {

  491.         int seq=1;

  492. resync:

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

  494.         if(len<0)

  495.             return AVERROR_IO;

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

  497. 

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

  499.             int h, pic_num, len2, pos;

  500. 

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

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

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

  504.             }

  505. 

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

  507.                 len2= pos= 0;

  508.             }else{

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

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

  511.             }

  512.             /* picture number */

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

  514.             rm->remaining_len= len;

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

  516. 

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

  518.             if(len2 && len2<len)

  519.                 len=len2;

  520.             rm->remaining_len-= len;

  521.             av_get_packet(pb, pkt, len);

  522. 

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

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

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

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

  527.                 int x;

  528.                 int sps = rm->sub_packet_size;

  529.                 int cfs = rm->coded_framesize;

  530.                 int h = rm->sub_packet_h;

  531.                 int y = rm->sub_packet_cnt;

  532.                 int w = rm->audio_framesize;

  533. 

  534.                 if (flags & 2)

  535.                     y = rm->sub_packet_cnt = 0;

  536.                 if (!y)

  537.                     rm->audiotimestamp = timestamp;

  538. 

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

  540.                     case CODEC_ID_RA_288:

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

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

  543.                         break;

  544.                     case CODEC_ID_ATRAC3:

  545.                     case CODEC_ID_COOK:

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

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

  548.                         break;

  549.                 }

  550. 

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

  552.                     goto resync;

  553.                 else {

  554.                     rm->sub_packet_cnt = 0;

  555.                     rm->audio_stream_num = i;

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

  557.                     // Release first audio packet

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

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

  560.                     timestamp = rm->audiotimestamp;

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

  562.                 }

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

  564.                 int x;

  565.                 rm->audio_stream_num = i;

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

  567.                 if (rm->sub_packet_cnt) {

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

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

  570.                     // Release first audio packet

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

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

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

  574.                 }

  575.             } else

  576.                 av_get_packet(pb, pkt, len);

  577. 

  578.         } else

  579.             av_get_packet(pb, pkt, len);

  580. 

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

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

  583.             av_free_packet(pkt);

  584.             goto resync;

  585.         }

  586. 

  587.         pkt->stream_index = i;

  588. 

  589. #if 0

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

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

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

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

  594. 

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

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

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

  598.             }

  599.         }

  600. #endif

  601.         pkt->pts= timestamp;

  602.         if(flags&2){

  603.             pkt->flags |= PKT_FLAG_KEY;

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

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

  606.         }

  607.     }

  608. 

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

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

  611.         ptr = pkt->data;

  612.         for(j=0;j<len;j+=2) {

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

  614.             ptr += 2;

  615.         }

  616.     }

  617.     return 0;

  618. }

  619. 

  620. static int rm_read_close(AVFormatContext *s)

  621. {

  622.     RMContext *rm = s->priv_data;

  623. 

  624.     av_free(rm->audiobuf);

  625.     return 0;

  626. }

  627. 

  628. static int rm_probe(AVProbeData *p)

  629. {

  630.     /* check file header */

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

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

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

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

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

  636.         return AVPROBE_SCORE_MAX;

  637.     else

  638.         return 0;

  639. }

  640. 

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

  642.                                int64_t *ppos, int64_t pos_limit)

  643. {

  644.     RMContext *rm = s->priv_data;

  645.     int64_t pos, dts;

  646.     int stream_index2, flags, len, h;

  647. 

  648.     pos = *ppos;

  649. 

  650.     if(rm->old_format)

  651.         return AV_NOPTS_VALUE;

  652. 

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

  654.     rm->remaining_len=0;

  655.     for(;;){

  656.         int seq=1;

  657.         AVStream *st;

  658. 

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

  660.         if(len<0)

  661.             return AV_NOPTS_VALUE;

  662. 

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

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

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

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

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

  668.             }

  669.         }

  670. 

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

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

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

  674.             if(stream_index2 == stream_index)

  675.                 break;

  676.         }

  677. 

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

  679.     }

  680.     *ppos = pos;

  681.     return dts;

  682. }

  683. 

  684. AVInputFormat rm_demuxer = {

  685.     "rm",

  686.     "rm format",

  687.     sizeof(RMContext),

  688.     rm_probe,

  689.     rm_read_header,

  690.     rm_read_packet,

  691.     rm_read_close,

  692.     NULL,

  693.     rm_read_dts,

  694. };