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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. 

  22. #include "libavutil/avstring.h"

  23. #include "avformat.h"

  24. #include "rm.h"

  25. 

  26. static inline void get_strl(ByteIOContext *pb, char *buf, int buf_size, int len)

  27. {

  28.     int i;

  29.     char *q, r;

  30. 

  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_str16(ByteIOContext *pb, char *buf, int buf_size)

  41. {

  42.     get_strl(pb, buf, buf_size, get_be16(pb));

  43. }

  44. 

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

  46. {

  47.     get_strl(pb, buf, buf_size, get_byte(pb));

  48. }

  49. 

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

  51.                                       int read_all)

  52. {

  53.     RMContext *rm = s->priv_data;

  54.     ByteIOContext *pb = s->pb;

  55.     char buf[256];

  56.     uint32_t version;

  57.     int i;

  58. 

  59.     /* ra type header */

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

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

  62.         int64_t startpos = url_ftell(pb);

  63.         /* very old version */

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

  65.             get_byte(pb);

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

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

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

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

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

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

  72.         get_byte(pb);

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

  74.         }

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

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

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

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

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

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

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

  82.     } else {

  83.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  84.         /* old version (4) */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  99.             get_be16(pb); get_be16(pb); get_be16(pb); }

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

  101.         get_be32(pb);

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

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

  104.             get_be32(pb);

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

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

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

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

  109.             buf[4] = 0;

  110.         } else {

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

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

  113.         }

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

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

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

  117.             st->need_parsing = AVSTREAM_PARSE_FULL;

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

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

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

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

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

  123. 

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

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

  126.                 return -1;

  127.             }

  128. 

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

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

  131.             int codecdata_length, i;

  132.             get_be16(pb); get_byte(pb);

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

  134.                 get_byte(pb);

  135.             codecdata_length = get_be32(pb);

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

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

  138.                 return -1;

  139.             }

  140. 

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

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

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

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

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

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

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

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

  149. 

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

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

  152.                 return -1;

  153.             }

  154. 

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

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

  157.             int codecdata_length, i;

  158.             get_be16(pb); get_byte(pb);

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

  160.                 get_byte(pb);

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

  162.             codecdata_length = get_be32(pb);

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

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

  165.                 return -1;

  166.             }

  167.             if (codecdata_length >= 1) {

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

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

  170.                 get_byte(pb);

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

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

  173.             }

  174.         } else {

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

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

  177.         }

  178.         if (read_all) {

  179.             get_byte(pb);

  180.             get_byte(pb);

  181.             get_byte(pb);

  182. 

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

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

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

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

  187.         }

  188.     }

  189.     return 0;

  190. }

  191. 

  192. int

  193. ff_rm_read_mdpr_codecdata (AVFormatContext *s, AVStream *st, int codec_data_size)

  194. {

  195.     ByteIOContext *pb = s->pb;

  196.     unsigned int v;

  197.     int size;

  198.     int64_t codec_pos;

  199. 

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

  201.     codec_pos = url_ftell(pb);

  202.     v = get_be32(pb);

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

  204.         /* ra type header */

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

  206.             return -1;

  207.     } else {

  208.         int fps, fps2;

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

  210.         fail1:

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

  212.             goto skip;

  213.         }

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

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

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

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

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

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

  220.             goto fail1;

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

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

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

  224.         fps= get_be16(pb);

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

  226.         get_be32(pb);

  227.         fps2= get_be16(pb);

  228.         get_be16(pb);

  229. 

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

  231. 

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

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

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

  235.             return -1;

  236.         }

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

  238.         if (!st->codec->extradata)

  239.             return AVERROR(ENOMEM);

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

  241. 

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

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

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

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

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

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

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

  249.         default: goto fail1;

  250.         }

  251.     }

  252. 

  253. skip:

  254.     /* skip codec info */

  255.     size = url_ftell(pb) - codec_pos;

  256.     url_fskip(pb, codec_data_size - size);

  257. 

  258.     return 0;

  259. }

  260. 

  261. 

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

  263. {

  264.     RMContext *rm = s->priv_data;

  265.     AVStream *st;

  266. 

  267.     rm->old_format = 1;

  268.     st = av_new_stream(s, 0);

  269.     if (!st)

  270.         return -1;

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

  272. }

  273. 

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

  275. {

  276.     RMContext *rm = s->priv_data;

  277.     AVStream *st;

  278.     ByteIOContext *pb = s->pb;

  279.     unsigned int tag;

  280.     int tag_size;

  281.     unsigned int start_time, duration;

  282.     char buf[128];

  283.     int flags = 0;

  284. 

  285.     tag = get_le32(pb);

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

  287.         /* very old .ra format */

  288.         return rm_read_header_old(s, ap);

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

  290.         return AVERROR(EIO);

  291.     }

  292. 

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

  294.     get_be16(pb);

  295.     get_be32(pb);

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

  297. 

  298.     for(;;) {

  299.         if (url_feof(pb))

  300.             return -1;

  301.         tag = get_le32(pb);

  302.         tag_size = get_be32(pb);

  303.         get_be16(pb);

  304. #if 0

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

  306.                (tag) & 0xff,

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

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

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

  310.                tag,

  311.                tag_size);

  312. #endif

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

  314.             return -1;

  315.         switch(tag) {

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

  317.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

  329.             break;

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

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

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

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

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

  335.             break;

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

  337.             st = av_new_stream(s, 0);

  338.             if (!st)

  339.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  348.             st->start_time = start_time;

  349.             st->duration = duration;

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

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

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

  353.             if (ff_rm_read_mdpr_codecdata(s, st, get_be32(pb)) < 0)

  354.                 return -1;

  355.             break;

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

  357.             goto header_end;

  358.         default:

  359.             /* unknown tag: skip it */

  360.             url_fskip(pb, tag_size - 10);

  361.             break;

  362.         }

  363.     }

  364.  header_end:

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

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

  367.         rm->nb_packets = 3600 * 25;

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

  369.     rm->curpic_num = -1;

  370.     return 0;

  371. }

  372. 

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

  374. {

  375.     int n, n1;

  376. 

  377.     n = get_be16(pb);

  378.     (*len)-=2;

  379.     n &= 0x7FFF;

  380.     if (n >= 0x4000) {

  381.         return n - 0x4000;

  382.     } else {

  383.         n1 = get_be16(pb);

  384.         (*len)-=2;

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

  386.     }

  387. }

  388. 

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

  390. #define RAW_PACKET_SIZE 1000

  391. 

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

  393.     RMContext *rm = s->priv_data;

  394.     ByteIOContext *pb = s->pb;

  395.     int len, num, res, i;

  396.     AVStream *st;

  397.     uint32_t state=0xFFFFFFFF;

  398. 

  399.     while(!url_feof(pb)){

  400.         *pos= url_ftell(pb) - 3;

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

  402.             num= rm->current_stream;

  403.             len= rm->remaining_len;

  404.             *timestamp = AV_NOPTS_VALUE;

  405.             *flags= 0;

  406.         }else{

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

  408. 

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

  410.                 len = get_be16(pb) - 6;

  411.                 if(len<0)

  412.                     continue;

  413.                 goto skip;

  414.             }

  415. 

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

  417.                 continue;

  418.             len=state;

  419.             state= 0xFFFFFFFF;

  420. 

  421.             num = get_be16(pb);

  422.             *timestamp = get_be32(pb);

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

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

  425. 

  426. 

  427.             len -= 12;

  428.         }

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

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

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

  432.                 break;

  433.         }

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

  435. skip:

  436.             /* skip packet if unknown number */

  437.             url_fskip(pb, len);

  438.             rm->remaining_len -= len;

  439.             continue;

  440.         }

  441.         *stream_index= i;

  442. 

  443.         return len;

  444.     }

  445.     return -1;

  446. }

  447. 

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

  449. {

  450.     ByteIOContext *pb = s->pb;

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

  452.     int type;

  453. 

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

  455.     type = hdr >> 6;

  456.     switch(type){

  457.     case 0: // slice

  458.     case 2: // last slice

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

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

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

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

  463.         rm->remaining_len = len;

  464.         break;

  465.     case 1: //whole frame

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

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

  468.             return AVERROR(EIO);

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

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

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

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

  473.         rm->remaining_len = 0;

  474.         return 0;

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

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

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

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

  479.         rm->remaining_len = len - len2;

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

  481.             return AVERROR(EIO);

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

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

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

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

  486.         return 0;

  487.     }

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

  489. 

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

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

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

  493.         av_free(rm->videobuf);

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

  495.             return AVERROR(ENOMEM);

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

  497.         rm->cur_slice = 0;

  498.         rm->curpic_num = pic_num;

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

  500.     }

  501.     if(type == 2)

  502.         len = FFMIN(len, pos);

  503. 

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

  505.         return 1;

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

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

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

  509.         return 1;

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

  511.         return AVERROR(EIO);

  512.     rm->videobufpos += len;

  513.     rm->remaining_len-= len;

  514. 

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

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

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

  518.              return AVERROR(ENOMEM);

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

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

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

  522.          pkt->pts = AV_NOPTS_VALUE;

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

  524.          return 0;

  525.     }

  526. 

  527.     return 1;

  528. }

  529. 

  530. static inline void

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

  532. {

  533.     uint8_t *ptr;

  534.     int j;

  535. 

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

  537.         ptr = pkt->data;

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

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

  540.             ptr += 2;

  541.         }

  542.     }

  543. }

  544. 

  545. int

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

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

  548. {

  549.     ByteIOContext *pb = s->pb;

  550.     RMContext *rm = s->priv_data;

  551. 

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

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

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

  555.             return -1; //got partial frame

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

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

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

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

  560.             int x;

  561.             int sps = rm->sub_packet_size;

  562.             int cfs = rm->coded_framesize;

  563.             int h = rm->sub_packet_h;

  564.             int y = rm->sub_packet_cnt;

  565.             int w = rm->audio_framesize;

  566. 

  567.             if (*flags & 2)

  568.                 y = rm->sub_packet_cnt = 0;

  569.             if (!y)

  570.                 rm->audiotimestamp = *timestamp;

  571. 

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

  573.                 case CODEC_ID_RA_288:

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

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

  576.                     break;

  577.                 case CODEC_ID_ATRAC3:

  578.                 case CODEC_ID_COOK:

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

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

  581.                     break;

  582.             }

  583. 

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

  585.                 return -1;

  586.             else {

  587.                 rm->sub_packet_cnt = 0;

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

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

  590.                 // Release first audio packet

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

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

  593.                 *timestamp = rm->audiotimestamp;

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

  595.             }

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

  597.             int x;

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

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

  600.             if (rm->sub_packet_cnt) {

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

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

  603.                 // Release first audio packet

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

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

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

  607.             }

  608.         } else {

  609.             av_get_packet(pb, pkt, len);

  610.             rm_ac3_swap_bytes(st, pkt);

  611.         }

  612.     } else

  613.         av_get_packet(pb, pkt, len);

  614. 

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

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

  617.         av_free_packet(pkt);

  618.         return -1;

  619.     }

  620. 

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

  622. 

  623. #if 0

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

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

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

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

  628. 

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

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

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

  632.         }

  633.     }

  634. #endif

  635. 

  636.     pkt->pts= *timestamp;

  637.     if (*flags & 2)

  638.         pkt->flags |= PKT_FLAG_KEY;

  639. 

  640.     return 0;

  641. }

  642. 

  643. void

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

  645. {

  646.     ByteIOContext *pb = s->pb;

  647.     RMContext *rm = s->priv_data;

  648. 

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

  650. 

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

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

  653.     else {

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

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

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

  657.                st->codec->block_align);

  658.     }

  659.     rm->audio_pkt_cnt--;

  660.     pkt->flags = 0;

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

  662. }

  663. 

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

  665. {

  666.     RMContext *rm = s->priv_data;

  667.     ByteIOContext *pb = s->pb;

  668.     AVStream *st;

  669.     int i, len;

  670.     int64_t timestamp, pos;

  671.     int flags;

  672. 

  673.     if (rm->audio_pkt_cnt) {

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

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

  676.         ff_rm_retrieve_cache(s, st, pkt);

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

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

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

  680.             int x, y;

  681. 

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

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

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

  685.                         return AVERROR(EIO);

  686.             rm->audio_stream_num = 0;

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

  688.             // Release first audio packet

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

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

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

  692.             pkt->stream_index = 0;

  693.         } else {

  694.             /* just read raw bytes */

  695.             len = RAW_PACKET_SIZE;

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

  697.             pkt->stream_index = 0;

  698.             if (len <= 0) {

  699.                 return AVERROR(EIO);

  700.             }

  701.             pkt->size = len;

  702.         }

  703.         rm_ac3_swap_bytes(st, pkt);

  704.     } else {

  705.         int seq=1;

  706. resync:

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

  708.         if(len<0)

  709.             return AVERROR(EIO);

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

  711. 

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

  713.             goto resync;

  714. 

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

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

  717.     }

  718. 

  719.     return 0;

  720. }

  721. 

  722. static int rm_read_close(AVFormatContext *s)

  723. {

  724.     RMContext *rm = s->priv_data;

  725. 

  726.     av_free(rm->audiobuf);

  727.     av_free(rm->videobuf);

  728.     return 0;

  729. }

  730. 

  731. static int rm_probe(AVProbeData *p)

  732. {

  733.     /* check file header */

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

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

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

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

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

  739.         return AVPROBE_SCORE_MAX;

  740.     else

  741.         return 0;

  742. }

  743. 

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

  745.                                int64_t *ppos, int64_t pos_limit)

  746. {

  747.     RMContext *rm = s->priv_data;

  748.     int64_t pos, dts;

  749.     int stream_index2, flags, len, h;

  750. 

  751.     pos = *ppos;

  752. 

  753.     if(rm->old_format)

  754.         return AV_NOPTS_VALUE;

  755. 

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

  757.     rm->remaining_len=0;

  758.     for(;;){

  759.         int seq=1;

  760.         AVStream *st;

  761. 

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

  763.         if(len<0)

  764.             return AV_NOPTS_VALUE;

  765. 

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

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

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

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

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

  771.             }

  772.         }

  773. 

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

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

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

  777.             if(stream_index2 == stream_index)

  778.                 break;

  779.         }

  780. 

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

  782.     }

  783.     *ppos = pos;

  784.     return dts;

  785. }

  786. 

  787. AVInputFormat rm_demuxer = {

  788.     "rm",

  789.     NULL_IF_CONFIG_SMALL("RM format"),

  790.     sizeof(RMContext),

  791.     rm_probe,

  792.     rm_read_header,

  793.     rm_read_packet,

  794.     rm_read_close,

  795.     NULL,

  796.     rm_read_dts,

  797. };