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

  26. {

  27.     int len, i;

  28.     char *q, r;

  29. 

  30.     len = get_be16(pb);

  31.     q = buf;

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

  33.         r = get_byte(pb);

  34.         if (i < buf_size - 1)

  35.             *q++ = r;

  36.     }

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

  38. }

  39. 

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

  41. {

  42.     int len, i;

  43.     char *q, r;

  44. 

  45.     len = get_byte(pb);

  46.     q = buf;

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

  48.         r = get_byte(pb);

  49.         if (i < buf_size - 1)

  50.             *q++ = r;

  51.     }

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

  53. }

  54. 

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

  56.                                       int read_all)

  57. {

  58.     RMContext *rm = s->priv_data;

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

  60.     char buf[256];

  61.     uint32_t version;

  62.     int i;

  63. 

  64.     /* ra type header */

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

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

  67.         int64_t startpos = url_ftell(pb);

  68.         /* very old version */

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

  70.             get_byte(pb);

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

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

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

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

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

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

  77.         get_byte(pb);

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

  79.         }

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

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

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

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

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

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

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

  87.     } else {

  88.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  89.         /* old version (4) */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  104.             get_be16(pb); get_be16(pb); get_be16(pb); }

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

  106.         get_be32(pb);

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

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

  109.             get_be32(pb);

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

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

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

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

  114.             buf[4] = 0;

  115.         } else {

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

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

  118.         }

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

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

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

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

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

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

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

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

  127. 

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

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

  130.                 return -1;

  131.             }

  132. 

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

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

  135.             int codecdata_length, i;

  136.             get_be16(pb); get_byte(pb);

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

  138.                 get_byte(pb);

  139.             codecdata_length = get_be32(pb);

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

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

  142.                 return -1;

  143.             }

  144. 

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

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

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

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

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

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

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

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

  153. 

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

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

  156.                 return -1;

  157.             }

  158. 

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

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

  161.             int codecdata_length, i;

  162.             get_be16(pb); get_byte(pb);

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

  164.                 get_byte(pb);

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

  166.             codecdata_length = get_be32(pb);

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

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

  169.                 return -1;

  170.             }

  171.             if (codecdata_length >= 1) {

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

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

  174.                 get_byte(pb);

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

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

  177.             }

  178.         } else {

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

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

  181.         }

  182.         if (read_all) {

  183.             get_byte(pb);

  184.             get_byte(pb);

  185.             get_byte(pb);

  186. 

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

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

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

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

  191.         }

  192.     }

  193.     return 0;

  194. }

  195. 

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

  197. {

  198.     RMContext *rm = s->priv_data;

  199.     AVStream *st;

  200. 

  201.     rm->old_format = 1;

  202.     st = av_new_stream(s, 0);

  203.     if (!st)

  204.         return -1;

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

  206. }

  207. 

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

  209. {

  210.     RMContext *rm = s->priv_data;

  211.     AVStream *st;

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

  213.     unsigned int tag, v;

  214.     int tag_size, size, codec_data_size, i;

  215.     int64_t codec_pos;

  216.     unsigned int start_time, duration;

  217.     char buf[128];

  218.     int flags = 0;

  219. 

  220.     tag = get_le32(pb);

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

  222.         /* very old .ra format */

  223.         return rm_read_header_old(s, ap);

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

  225.         return AVERROR(EIO);

  226.     }

  227. 

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

  229.     get_be16(pb);

  230.     get_be32(pb);

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

  232. 

  233.     for(;;) {

  234.         if (url_feof(pb))

  235.             goto fail;

  236.         tag = get_le32(pb);

  237.         tag_size = get_be32(pb);

  238.         get_be16(pb);

  239. #if 0

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

  241.                (tag) & 0xff,

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

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

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

  245.                tag,

  246.                tag_size);

  247. #endif

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

  249.             goto fail;

  250.         switch(tag) {

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

  252.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

  264.             break;

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

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

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

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

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

  270.             break;

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

  272.             st = av_new_stream(s, 0);

  273.             if (!st)

  274.                 goto fail;

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

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

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

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

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

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

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

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

  283.             st->start_time = start_time;

  284.             st->duration = duration;

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

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

  287.             codec_data_size = get_be32(pb);

  288.             codec_pos = url_ftell(pb);

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

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

  291. 

  292.             v = get_be32(pb);

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

  294.                 /* ra type header */

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

  296.                     return -1;

  297.             } else {

  298.                 int fps, fps2;

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

  300.                 fail1:

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

  302.                     goto skip;

  303.                 }

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

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

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

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

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

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

  310.                     goto fail1;

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

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

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

  314.                 fps= get_be16(pb);

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

  316.                 get_be32(pb);

  317.                 fps2= get_be16(pb);

  318.                 get_be16(pb);

  319. 

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

  321. 

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

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

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

  325.                     return -1;

  326.                 }

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

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

  329. 

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

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

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

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

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

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

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

  337.                 default: goto fail1;

  338.                 }

  339.             }

  340. skip:

  341.             /* skip codec info */

  342.             size = url_ftell(pb) - codec_pos;

  343.             url_fskip(pb, codec_data_size - size);

  344.             break;

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

  346.             goto header_end;

  347.         default:

  348.             /* unknown tag: skip it */

  349.             url_fskip(pb, tag_size - 10);

  350.             break;

  351.         }

  352.     }

  353.  header_end:

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

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

  356.         rm->nb_packets = 3600 * 25;

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

  358.     return 0;

  359. 

  360.  fail:

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

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

  363.     }

  364.     return AVERROR(EIO);

  365. }

  366. 

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

  368. {

  369.     int n, n1;

  370. 

  371.     n = get_be16(pb);

  372.     (*len)-=2;

  373.     if (n >= 0x4000) {

  374.         return n - 0x4000;

  375.     } else {

  376.         n1 = get_be16(pb);

  377.         (*len)-=2;

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

  379.     }

  380. }

  381. 

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

  383. #define RAW_PACKET_SIZE 1000

  384. 

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

  386.     RMContext *rm = s->priv_data;

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

  388.     int len, num, res, i;

  389.     AVStream *st;

  390.     uint32_t state=0xFFFFFFFF;

  391. 

  392.     while(!url_feof(pb)){

  393.         *pos= url_ftell(pb);

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

  395.             num= rm->current_stream;

  396.             len= rm->remaining_len;

  397.             *timestamp = AV_NOPTS_VALUE;

  398.             *flags= 0;

  399.         }else{

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

  401. 

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

  403.                 len = get_be16(pb) - 6;

  404.                 if(len<0)

  405.                     continue;

  406.                 goto skip;

  407.             }

  408. 

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

  410.                 continue;

  411.             len=state;

  412.             state= 0xFFFFFFFF;

  413. 

  414.             num = get_be16(pb);

  415.             *timestamp = get_be32(pb);

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

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

  418. 

  419. 

  420.             len -= 12;

  421.         }

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

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

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

  425.                 break;

  426.         }

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

  428. skip:

  429.             /* skip packet if unknown number */

  430.             url_fskip(pb, len);

  431.             rm->remaining_len -= len;

  432.             continue;

  433.         }

  434.         *stream_index= i;

  435. 

  436.         return len;

  437.     }

  438.     return -1;

  439. }

  440. 

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

  442. {

  443.     RMContext *rm = s->priv_data;

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

  445.     AVStream *st;

  446.     int i, len, j;

  447.     int64_t timestamp, pos;

  448.     uint8_t *ptr;

  449.     int flags;

  450. 

  451.     if (rm->audio_pkt_cnt) {

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

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

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

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

  456.         else {

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

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

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

  460.                st->codec->block_align);

  461.         }

  462.         rm->audio_pkt_cnt--;

  463.         pkt->flags = 0;

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

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

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

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

  468.             int x, y;

  469. 

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

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

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

  473.                         return AVERROR(EIO);

  474.             rm->audio_stream_num = 0;

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

  476.             // Release first audio packet

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

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

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

  480.             pkt->stream_index = 0;

  481.         } else {

  482.             /* just read raw bytes */

  483.             len = RAW_PACKET_SIZE;

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

  485.             pkt->stream_index = 0;

  486.             if (len <= 0) {

  487.                 return AVERROR(EIO);

  488.             }

  489.             pkt->size = len;

  490.         }

  491.     } else {

  492.         int seq=1;

  493. resync:

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

  495.         if(len<0)

  496.             return AVERROR(EIO);

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

  498. 

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

  500.             int h, pic_num, len2, pos;

  501. 

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

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

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

  505.             }

  506. 

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

  508.                 len2= pos= 0;

  509.             }else{

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

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

  512.             }

  513.             /* picture number */

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

  515.             rm->remaining_len= len;

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

  517. 

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

  519.             if(len2 && len2<len)

  520.                 len=len2;

  521.             rm->remaining_len-= len;

  522.             av_get_packet(pb, pkt, len);

  523. 

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

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

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

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

  528.                 int x;

  529.                 int sps = rm->sub_packet_size;

  530.                 int cfs = rm->coded_framesize;

  531.                 int h = rm->sub_packet_h;

  532.                 int y = rm->sub_packet_cnt;

  533.                 int w = rm->audio_framesize;

  534. 

  535.                 if (flags & 2)

  536.                     y = rm->sub_packet_cnt = 0;

  537.                 if (!y)

  538.                     rm->audiotimestamp = timestamp;

  539. 

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

  541.                     case CODEC_ID_RA_288:

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

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

  544.                         break;

  545.                     case CODEC_ID_ATRAC3:

  546.                     case CODEC_ID_COOK:

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

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

  549.                         break;

  550.                 }

  551. 

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

  553.                     goto resync;

  554.                 else {

  555.                     rm->sub_packet_cnt = 0;

  556.                     rm->audio_stream_num = i;

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

  558.                     // Release first audio packet

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

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

  561.                     timestamp = rm->audiotimestamp;

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

  563.                 }

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

  565.                 int x;

  566.                 rm->audio_stream_num = i;

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

  568.                 if (rm->sub_packet_cnt) {

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

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

  571.                     // Release first audio packet

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

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

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

  575.                 }

  576.             } else

  577.                 av_get_packet(pb, pkt, len);

  578. 

  579.         } else

  580.             av_get_packet(pb, pkt, len);

  581. 

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

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

  584.             av_free_packet(pkt);

  585.             goto resync;

  586.         }

  587. 

  588.         pkt->stream_index = i;

  589. 

  590. #if 0

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

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

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

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

  595. 

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

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

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

  599.             }

  600.         }

  601. #endif

  602.         pkt->pts= timestamp;

  603.         if(flags&2){

  604.             pkt->flags |= PKT_FLAG_KEY;

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

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

  607.         }

  608.     }

  609. 

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

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

  612.         ptr = pkt->data;

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

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

  615.             ptr += 2;

  616.         }

  617.     }

  618.     return 0;

  619. }

  620. 

  621. static int rm_read_close(AVFormatContext *s)

  622. {

  623.     RMContext *rm = s->priv_data;

  624. 

  625.     av_free(rm->audiobuf);

  626.     return 0;

  627. }

  628. 

  629. static int rm_probe(AVProbeData *p)

  630. {

  631.     /* check file header */

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

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

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

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

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

  637.         return AVPROBE_SCORE_MAX;

  638.     else

  639.         return 0;

  640. }

  641. 

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

  643.                                int64_t *ppos, int64_t pos_limit)

  644. {

  645.     RMContext *rm = s->priv_data;

  646.     int64_t pos, dts;

  647.     int stream_index2, flags, len, h;

  648. 

  649.     pos = *ppos;

  650. 

  651.     if(rm->old_format)

  652.         return AV_NOPTS_VALUE;

  653. 

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

  655.     rm->remaining_len=0;

  656.     for(;;){

  657.         int seq=1;

  658.         AVStream *st;

  659. 

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

  661.         if(len<0)

  662.             return AV_NOPTS_VALUE;

  663. 

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

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

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

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

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

  669.             }

  670.         }

  671. 

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

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

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

  675.             if(stream_index2 == stream_index)

  676.                 break;

  677.         }

  678. 

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

  680.     }

  681.     *ppos = pos;

  682.     return dts;

  683. }

  684. 

  685. AVInputFormat rm_demuxer = {

  686.     "rm",

  687.     "rm format",

  688.     sizeof(RMContext),

  689.     rm_probe,

  690.     rm_read_header,

  691.     rm_read_packet,

  692.     rm_read_close,

  693.     NULL,

  694.     rm_read_dts,

  695. };