falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
12905 Commits
32 Branches
821MB
Tree: 88855b51cd
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '88855b51cd'
${ noResults }
FFmpeg/libavformat/rmdec.c

802 lines
26KB
Raw Blame History 

  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. int

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

  193. {

  194.     ByteIOContext *pb = s->pb;

  195.     unsigned int v;

  196.     int codec_data_size, size;

  197.     int64_t codec_pos;

  198. 

  199.     codec_data_size = get_be32(pb);

  200.     codec_pos = url_ftell(pb);

  201.     v = get_be32(pb);

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

  203.         /* ra type header */

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

  205.             return -1;

  206.     } else {

  207.         int fps, fps2;

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

  209.         fail1:

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

  211.             goto skip;

  212.         }

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

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

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

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

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

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

  219.             goto fail1;

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

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

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

  223.         fps= get_be16(pb);

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

  225.         get_be32(pb);

  226.         fps2= get_be16(pb);

  227.         get_be16(pb);

  228. 

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

  230. 

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

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

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

  234.             return -1;

  235.         }

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

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

  238. 

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

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

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

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

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

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

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

  246.         default: goto fail1;

  247.         }

  248.     }

  249. 

  250. skip:

  251.     /* skip codec info */

  252.     size = url_ftell(pb) - codec_pos;

  253.     url_fskip(pb, codec_data_size - size);

  254. 

  255.     return 0;

  256. }

  257. 

  258. 

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

  260. {

  261.     RMContext *rm = s->priv_data;

  262.     AVStream *st;

  263. 

  264.     rm->old_format = 1;

  265.     st = av_new_stream(s, 0);

  266.     if (!st)

  267.         return -1;

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

  269. }

  270. 

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

  272. {

  273.     RMContext *rm = s->priv_data;

  274.     AVStream *st;

  275.     ByteIOContext *pb = s->pb;

  276.     unsigned int tag;

  277.     int tag_size, i;

  278.     unsigned int start_time, duration;

  279.     char buf[128];

  280.     int flags = 0;

  281. 

  282.     tag = get_le32(pb);

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

  284.         /* very old .ra format */

  285.         return rm_read_header_old(s, ap);

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

  287.         return AVERROR(EIO);

  288.     }

  289. 

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

  291.     get_be16(pb);

  292.     get_be32(pb);

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

  294. 

  295.     for(;;) {

  296.         if (url_feof(pb))

  297.             goto fail;

  298.         tag = get_le32(pb);

  299.         tag_size = get_be32(pb);

  300.         get_be16(pb);

  301. #if 0

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

  303.                (tag) & 0xff,

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

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

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

  307.                tag,

  308.                tag_size);

  309. #endif

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

  311.             goto fail;

  312.         switch(tag) {

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

  314.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

  326.             break;

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

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

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

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

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

  332.             break;

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

  334.             st = av_new_stream(s, 0);

  335.             if (!st)

  336.                 goto fail;

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

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

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

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

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

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

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

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

  345.             st->start_time = start_time;

  346.             st->duration = duration;

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

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

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

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

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

  352.                 return -1;

  353.             break;

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

  355.             goto header_end;

  356.         default:

  357.             /* unknown tag: skip it */

  358.             url_fskip(pb, tag_size - 10);

  359.             break;

  360.         }

  361.     }

  362.  header_end:

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

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

  365.         rm->nb_packets = 3600 * 25;

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

  367.     rm->curpic_num = -1;

  368.     return 0;

  369. 

  370.  fail:

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

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

  373.     }

  374.     return AVERROR(EIO);

  375. }

  376. 

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

  378. {

  379.     int n, n1;

  380. 

  381.     n = get_be16(pb);

  382.     (*len)-=2;

  383.     n &= 0x7FFF;

  384.     if (n >= 0x4000) {

  385.         return n - 0x4000;

  386.     } else {

  387.         n1 = get_be16(pb);

  388.         (*len)-=2;

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

  390.     }

  391. }

  392. 

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

  394. #define RAW_PACKET_SIZE 1000

  395. 

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

  397.     RMContext *rm = s->priv_data;

  398.     ByteIOContext *pb = s->pb;

  399.     int len, num, res, i;

  400.     AVStream *st;

  401.     uint32_t state=0xFFFFFFFF;

  402. 

  403.     while(!url_feof(pb)){

  404.         *pos= url_ftell(pb);

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

  406.             num= rm->current_stream;

  407.             len= rm->remaining_len;

  408.             *timestamp = AV_NOPTS_VALUE;

  409.             *flags= 0;

  410.         }else{

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

  412. 

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

  414.                 len = get_be16(pb) - 6;

  415.                 if(len<0)

  416.                     continue;

  417.                 goto skip;

  418.             }

  419. 

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

  421.                 continue;

  422.             len=state;

  423.             state= 0xFFFFFFFF;

  424. 

  425.             num = get_be16(pb);

  426.             *timestamp = get_be32(pb);

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

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

  429. 

  430. 

  431.             len -= 12;

  432.         }

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

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

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

  436.                 break;

  437.         }

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

  439. skip:

  440.             /* skip packet if unknown number */

  441.             url_fskip(pb, len);

  442.             rm->remaining_len -= len;

  443.             continue;

  444.         }

  445.         *stream_index= i;

  446. 

  447.         return len;

  448.     }

  449.     return -1;

  450. }

  451. 

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

  453. {

  454.     ByteIOContext *pb = s->pb;

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

  456.     int type;

  457. 

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

  459.     type = hdr >> 6;

  460.     switch(type){

  461.     case 0: // slice

  462.     case 2: // last slice

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

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

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

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

  467.         rm->remaining_len = len;

  468.         break;

  469.     case 1: //whole frame

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

  471.         if(av_new_packet(pkt, len + 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, len);

  477.         rm->remaining_len = 0;

  478.         return 0;

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

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

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

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

  483.         rm->remaining_len = len - len2;

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

  485.             return AVERROR(EIO);

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

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

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

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

  490.         return 0;

  491.     }

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

  493. 

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

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

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

  497.         av_free(rm->videobuf);

  498.         if(!(rm->videobuf = av_malloc(rm->videobufsize)))

  499.             return AVERROR(ENOMEM);

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

  501.         rm->cur_slice = 0;

  502.         rm->curpic_num = pic_num;

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

  504.     }

  505.     if(type == 2)

  506.         len = FFMIN(len, pos);

  507. 

  508.     if(++rm->cur_slice > rm->slices)

  509.         return 1;

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

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

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

  513.         return 1;

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

  515.         return AVERROR(EIO);

  516.     rm->videobufpos += len;

  517.     rm->remaining_len-= len;

  518. 

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

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

  521.          if(av_new_packet(pkt, rm->videobufpos - 8*(rm->slices - rm->cur_slice)) < 0)

  522.              return AVERROR(ENOMEM);

  523.          memcpy(pkt->data, rm->videobuf, 1 + 8*rm->cur_slice);

  524.          memcpy(pkt->data + 1 + 8*rm->cur_slice, rm->videobuf + 1 + 8*rm->slices,

  525.                 rm->videobufpos - 1 - 8*rm->slices);

  526.          pkt->pts = AV_NOPTS_VALUE;

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

  528.          return 0;

  529.     }

  530. 

  531.     return 1;

  532. }

  533. 

  534. static inline void

  535. rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt)

  536. {

  537.     uint8_t *ptr;

  538.     int j;

  539. 

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

  541.         ptr = pkt->data;

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

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

  544.             ptr += 2;

  545.         }

  546.     }

  547. }

  548. 

  549. int

  550. ff_rm_parse_packet (AVFormatContext *s, AVStream *st, int len, AVPacket *pkt,

  551.                     int *seq, int *flags, int64_t *timestamp)

  552. {

  553.     ByteIOContext *pb = s->pb;

  554.     RMContext *rm = s->priv_data;

  555. 

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

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

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

  559.             return -1; //got partial frame

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

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

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

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

  564.             int x;

  565.             int sps = rm->sub_packet_size;

  566.             int cfs = rm->coded_framesize;

  567.             int h = rm->sub_packet_h;

  568.             int y = rm->sub_packet_cnt;

  569.             int w = rm->audio_framesize;

  570. 

  571.             if (*flags & 2)

  572.                 y = rm->sub_packet_cnt = 0;

  573.             if (!y)

  574.                 rm->audiotimestamp = *timestamp;

  575. 

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

  577.                 case CODEC_ID_RA_288:

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

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

  580.                     break;

  581.                 case CODEC_ID_ATRAC3:

  582.                 case CODEC_ID_COOK:

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

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

  585.                     break;

  586.             }

  587. 

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

  589.                 return -1;

  590.             else {

  591.                 rm->sub_packet_cnt = 0;

  592.                 rm->audio_stream_num = st->index;

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

  594.                 // Release first audio packet

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

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

  597.                 *timestamp = rm->audiotimestamp;

  598.                 *flags = 2; // Mark first packet as keyframe

  599.             }

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

  601.             int x;

  602.             rm->audio_stream_num = st->index;

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

  604.             if (rm->sub_packet_cnt) {

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

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

  607.                 // Release first audio packet

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

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

  610.                 *flags = 2; // Mark first packet as keyframe

  611.             }

  612.         } else {

  613.             av_get_packet(pb, pkt, len);

  614.             rm_ac3_swap_bytes(st, pkt);

  615.         }

  616.     } else

  617.         av_get_packet(pb, pkt, len);

  618. 

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

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

  621.         av_free_packet(pkt);

  622.         return -1;

  623.     }

  624. 

  625.     pkt->stream_index = st->index;

  626. 

  627. #if 0

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

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

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

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

  632. 

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

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

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

  636.         }

  637.     }

  638. #endif

  639. 

  640.     pkt->pts= *timestamp;

  641.     if (*flags & 2)

  642.         pkt->flags |= PKT_FLAG_KEY;

  643. 

  644.     return 0;

  645. }

  646. 

  647. void

  648. ff_rm_retrieve_cache (AVFormatContext *s, AVStream *st, AVPacket *pkt)

  649. {

  650.     ByteIOContext *pb = s->pb;

  651.     RMContext *rm = s->priv_data;

  652. 

  653.     assert (rm->audio_pkt_cnt > 0);

  654. 

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

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

  657.     else {

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

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

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

  661.                st->codec->block_align);

  662.     }

  663.     rm->audio_pkt_cnt--;

  664.     pkt->flags = 0;

  665.     pkt->stream_index = st->index;

  666. }

  667. 

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

  669. {

  670.     RMContext *rm = s->priv_data;

  671.     ByteIOContext *pb = s->pb;

  672.     AVStream *st;

  673.     int i, len;

  674.     int64_t timestamp, pos;

  675.     int flags;

  676. 

  677.     if (rm->audio_pkt_cnt) {

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

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

  680.         ff_rm_retrieve_cache(s, st, pkt);

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

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

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

  684.             int x, y;

  685. 

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

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

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

  689.                         return AVERROR(EIO);

  690.             rm->audio_stream_num = 0;

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

  692.             // Release first audio packet

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

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

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

  696.             pkt->stream_index = 0;

  697.         } else {

  698.             /* just read raw bytes */

  699.             len = RAW_PACKET_SIZE;

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

  701.             pkt->stream_index = 0;

  702.             if (len <= 0) {

  703.                 return AVERROR(EIO);

  704.             }

  705.             pkt->size = len;

  706.         }

  707.         rm_ac3_swap_bytes(st, pkt);

  708.     } else {

  709.         int seq=1;

  710. resync:

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

  712.         if(len<0)

  713.             return AVERROR(EIO);

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

  715. 

  716.         if (ff_rm_parse_packet (s, st, len, pkt, &seq, &flags, &timestamp) < 0)

  717.             goto resync;

  718. 

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

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

  721.     }

  722. 

  723.     return 0;

  724. }

  725. 

  726. static int rm_read_close(AVFormatContext *s)

  727. {

  728.     RMContext *rm = s->priv_data;

  729. 

  730.     av_free(rm->audiobuf);

  731.     av_free(rm->videobuf);

  732.     return 0;

  733. }

  734. 

  735. static int rm_probe(AVProbeData *p)

  736. {

  737.     /* check file header */

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

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

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

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

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

  743.         return AVPROBE_SCORE_MAX;

  744.     else

  745.         return 0;

  746. }

  747. 

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

  749.                                int64_t *ppos, int64_t pos_limit)

  750. {

  751.     RMContext *rm = s->priv_data;

  752.     int64_t pos, dts;

  753.     int stream_index2, flags, len, h;

  754. 

  755.     pos = *ppos;

  756. 

  757.     if(rm->old_format)

  758.         return AV_NOPTS_VALUE;

  759. 

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

  761.     rm->remaining_len=0;

  762.     for(;;){

  763.         int seq=1;

  764.         AVStream *st;

  765. 

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

  767.         if(len<0)

  768.             return AV_NOPTS_VALUE;

  769. 

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

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

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

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

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

  775.             }

  776.         }

  777. 

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

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

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

  781.             if(stream_index2 == stream_index)

  782.                 break;

  783.         }

  784. 

  785.         url_fskip(s->pb, len);

  786.     }

  787.     *ppos = pos;

  788.     return dts;

  789. }

  790. 

  791. AVInputFormat rm_demuxer = {

  792.     "rm",

  793.     "rm format",

  794.     sizeof(RMContext),

  795.     rm_probe,

  796.     rm_read_header,

  797.     rm_read_packet,

  798.     rm_read_close,

  799.     NULL,

  800.     rm_read_dts,

  801. };