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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. 

  25. typedef struct {

  26.     int nb_packets;

  27.     int old_format;

  28.     int current_stream;

  29.     int remaining_len;

  30.     uint8_t *videobuf; ///< place to store merged video frame

  31.     int videobufsize;  ///< current assembled frame size

  32.     int videobufpos;   ///< position for the next slice in the video buffer

  33.     int curpic_num;    ///< picture number of current frame

  34.     int cur_slice, slices;

  35.     int64_t pktpos;    ///< first slice position in file

  36.     /// Audio descrambling matrix parameters

  37.     uint8_t *audiobuf; ///< place to store reordered audio data

  38.     int64_t audiotimestamp; ///< Audio packet timestamp

  39.     int sub_packet_cnt; // Subpacket counter, used while reading

  40.     int sub_packet_size, sub_packet_h, coded_framesize; ///< Descrambling parameters from container

  41.     int audio_stream_num; ///< Stream number for audio packets

  42.     int audio_pkt_cnt; ///< Output packet counter

  43.     int audio_framesize; /// Audio frame size from container

  44.     int sub_packet_lengths[16]; /// Length of each aac subpacket

  45. } RMDemuxContext;

  46. 

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

  48. {

  49.     int i;

  50.     char *q, r;

  51. 

  52.     q = buf;

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

  54.         r = get_byte(pb);

  55.         if (i < buf_size - 1)

  56.             *q++ = r;

  57.     }

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

  59. }

  60. 

  61. static void get_str16(ByteIOContext *pb, char *buf, int buf_size)

  62. {

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

  64. }

  65. 

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

  67. {

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

  69. }

  70. 

  71. static int rm_read_audio_stream_info(AVFormatContext *s, ByteIOContext *pb,

  72.                                      AVStream *st, int read_all)

  73. {

  74.     RMDemuxContext *rm = s->priv_data;

  75.     char buf[256];

  76.     uint32_t version;

  77. 

  78.     /* ra type header */

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

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

  81.         int64_t startpos = url_ftell(pb);

  82.         url_fskip(pb, 14);

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

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

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

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

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

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

  89.             get_byte(pb);

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

  91.         }

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

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

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

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

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

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

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

  99.     } else {

  100.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  101.         /* old version (4) */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  116.             get_be16(pb); get_be16(pb); get_be16(pb);

  117.         }

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

  119.         get_be32(pb);

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

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

  122.             get_be32(pb);

  123.             get_buffer(pb, buf, 4);

  124.             buf[4] = 0;

  125.         } else {

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

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

  128.         }

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

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

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

  132.             st->need_parsing = AVSTREAM_PARSE_FULL;

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

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

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

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

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

  138. 

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

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

  141.                 return -1;

  142.             }

  143. 

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

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

  146.             int codecdata_length;

  147.             get_be16(pb); get_byte(pb);

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

  149.                 get_byte(pb);

  150.             codecdata_length = get_be32(pb);

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

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

  153.                 return -1;

  154.             }

  155. 

  156.             if(sub_packet_size <= 0){

  157.                 av_log(s, AV_LOG_ERROR, "sub_packet_size is invalid\n");

  158.                 return -1;

  159.             }

  160. 

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

  162.             else if (!strcmp(buf, "sipr")) st->codec->codec_id = CODEC_ID_SIPR;

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

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

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

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

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

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

  169. 

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

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

  172.                 return -1;

  173.             }

  174. 

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

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

  177.             int codecdata_length;

  178.             get_be16(pb); get_byte(pb);

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

  180.                 get_byte(pb);

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

  182.             codecdata_length = get_be32(pb);

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

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

  185.                 return -1;

  186.             }

  187.             if (codecdata_length >= 1) {

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

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

  190.                 get_byte(pb);

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

  192.             }

  193.         } else {

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

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

  196.         }

  197.         if (read_all) {

  198.             get_byte(pb);

  199.             get_byte(pb);

  200.             get_byte(pb);

  201. 

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

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

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

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

  206.         }

  207.     }

  208.     return 0;

  209. }

  210. 

  211. int

  212. ff_rm_read_mdpr_codecdata (AVFormatContext *s, ByteIOContext *pb,

  213.                            AVStream *st, int codec_data_size)

  214. {

  215.     unsigned int v;

  216.     int size;

  217.     int64_t codec_pos;

  218. 

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

  220.     codec_pos = url_ftell(pb);

  221.     v = get_be32(pb);

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

  223.         /* ra type header */

  224.         if (rm_read_audio_stream_info(s, pb, st, 0))

  225.             return -1;

  226.     } else {

  227.         int fps, fps2;

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

  229.         fail1:

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

  231.             goto skip;

  232.         }

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

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

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

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

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

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

  239.             && st->codec->codec_tag != MKTAG('R', 'V', 'T', 'R'))

  240.             goto fail1;

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

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

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

  244.         fps= get_be16(pb);

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

  246.         get_be32(pb);

  247.         fps2= get_be16(pb);

  248.         get_be16(pb);

  249. 

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

  251. 

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

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

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

  255.             return -1;

  256.         }

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

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

  259.             return AVERROR(ENOMEM);

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

  261. 

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

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

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

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

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

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

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

  269.         default: goto fail1;

  270.         }

  271.     }

  272. 

  273. skip:

  274.     /* skip codec info */

  275.     size = url_ftell(pb) - codec_pos;

  276.     url_fskip(pb, codec_data_size - size);

  277. 

  278.     return 0;

  279. }

  280. 

  281. 

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

  283. {

  284.     RMDemuxContext *rm = s->priv_data;

  285.     AVStream *st;

  286. 

  287.     rm->old_format = 1;

  288.     st = av_new_stream(s, 0);

  289.     if (!st)

  290.         return -1;

  291.     return rm_read_audio_stream_info(s, s->pb, st, 1);

  292. }

  293. 

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

  295. {

  296.     RMDemuxContext *rm = s->priv_data;

  297.     AVStream *st;

  298.     ByteIOContext *pb = s->pb;

  299.     unsigned int tag;

  300.     int tag_size;

  301.     unsigned int start_time, duration;

  302.     char buf[128];

  303.     int flags = 0;

  304. 

  305.     tag = get_le32(pb);

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

  307.         /* very old .ra format */

  308.         return rm_read_header_old(s, ap);

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

  310.         return AVERROR(EIO);

  311.     }

  312. 

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

  314.     get_be16(pb);

  315.     get_be32(pb);

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

  317. 

  318.     for(;;) {

  319.         if (url_feof(pb))

  320.             return -1;

  321.         tag = get_le32(pb);

  322.         tag_size = get_be32(pb);

  323.         get_be16(pb);

  324. #if 0

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

  326.                (tag) & 0xff,

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

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

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

  330.                tag,

  331.                tag_size);

  332. #endif

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

  334.             return -1;

  335.         switch(tag) {

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

  337.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

  349.             break;

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

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

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

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

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

  355.             break;

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

  357.             st = av_new_stream(s, 0);

  358.             if (!st)

  359.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  368.             st->start_time = start_time;

  369.             st->duration = duration;

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

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

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

  373.             if (ff_rm_read_mdpr_codecdata(s, s->pb, st, get_be32(pb)) < 0)

  374.                 return -1;

  375.             break;

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

  377.             goto header_end;

  378.         default:

  379.             /* unknown tag: skip it */

  380.             url_fskip(pb, tag_size - 10);

  381.             break;

  382.         }

  383.     }

  384.  header_end:

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

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

  387.         rm->nb_packets = 3600 * 25;

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

  389.     rm->curpic_num = -1;

  390.     return 0;

  391. }

  392. 

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

  394. {

  395.     int n, n1;

  396. 

  397.     n = get_be16(pb);

  398.     (*len)-=2;

  399.     n &= 0x7FFF;

  400.     if (n >= 0x4000) {

  401.         return n - 0x4000;

  402.     } else {

  403.         n1 = get_be16(pb);

  404.         (*len)-=2;

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

  406.     }

  407. }

  408. 

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

  410. #define RAW_PACKET_SIZE 1000

  411. 

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

  413.     RMDemuxContext *rm = s->priv_data;

  414.     ByteIOContext *pb = s->pb;

  415.     int len, num, res, i;

  416.     AVStream *st;

  417.     uint32_t state=0xFFFFFFFF;

  418. 

  419.     while(!url_feof(pb)){

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

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

  422.             num= rm->current_stream;

  423.             len= rm->remaining_len;

  424.             *timestamp = AV_NOPTS_VALUE;

  425.             *flags= 0;

  426.         }else{

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

  428. 

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

  430.                 len = get_be16(pb) - 6;

  431.                 if(len<0)

  432.                     continue;

  433.                 goto skip;

  434.             }

  435. 

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

  437.                 continue;

  438.             len=state;

  439.             state= 0xFFFFFFFF;

  440. 

  441.             num = get_be16(pb);

  442.             *timestamp = get_be32(pb);

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

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

  445. 

  446. 

  447.             len -= 12;

  448.         }

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

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

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

  452.                 break;

  453.         }

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

  455. skip:

  456.             /* skip packet if unknown number */

  457.             url_fskip(pb, len);

  458.             rm->remaining_len -= len;

  459.             continue;

  460.         }

  461.         *stream_index= i;

  462. 

  463.         return len;

  464.     }

  465.     return -1;

  466. }

  467. 

  468. static int rm_assemble_video_frame(AVFormatContext *s, ByteIOContext *pb,

  469.                                    RMDemuxContext *rm, AVPacket *pkt, int len)

  470. {

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

  472.     int type;

  473. 

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

  475.     type = hdr >> 6;

  476.     switch(type){

  477.     case 0: // slice

  478.     case 2: // last slice

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

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

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

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

  483.         rm->remaining_len = len;

  484.         break;

  485.     case 1: //whole frame

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

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

  488.             return AVERROR(EIO);

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

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

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

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

  493.         rm->remaining_len = 0;

  494.         return 0;

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

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

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

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

  499.         rm->remaining_len = len - len2;

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

  501.             return AVERROR(EIO);

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

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

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

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

  506.         return 0;

  507.     }

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

  509. 

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

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

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

  513.         av_free(rm->videobuf);

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

  515.             return AVERROR(ENOMEM);

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

  517.         rm->cur_slice = 0;

  518.         rm->curpic_num = pic_num;

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

  520.     }

  521.     if(type == 2)

  522.         len = FFMIN(len, pos);

  523. 

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

  525.         return 1;

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

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

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

  529.         return 1;

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

  531.         return AVERROR(EIO);

  532.     rm->videobufpos += len;

  533.     rm->remaining_len-= len;

  534. 

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

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

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

  538.              return AVERROR(ENOMEM);

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

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

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

  542.          pkt->pts = AV_NOPTS_VALUE;

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

  544.          return 0;

  545.     }

  546. 

  547.     return 1;

  548. }

  549. 

  550. static inline void

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

  552. {

  553.     uint8_t *ptr;

  554.     int j;

  555. 

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

  557.         ptr = pkt->data;

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

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

  560.             ptr += 2;

  561.         }

  562.     }

  563. }

  564. 

  565. int

  566. ff_rm_parse_packet (AVFormatContext *s, ByteIOContext *pb,

  567.                     AVStream *st, int len, AVPacket *pkt,

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

  569. {

  570.     RMDemuxContext *rm = s->priv_data;

  571. 

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

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

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

  575.             return -1; //got partial frame

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

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

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

  579.             (st->codec->codec_id == CODEC_ID_ATRAC3) ||

  580.             (st->codec->codec_id == CODEC_ID_SIPR)) {

  581.             int x;

  582.             int sps = rm->sub_packet_size;

  583.             int cfs = rm->coded_framesize;

  584.             int h = rm->sub_packet_h;

  585.             int y = rm->sub_packet_cnt;

  586.             int w = rm->audio_framesize;

  587. 

  588.             if (*flags & 2)

  589.                 y = rm->sub_packet_cnt = 0;

  590.             if (!y)

  591.                 rm->audiotimestamp = *timestamp;

  592. 

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

  594.                 case CODEC_ID_RA_288:

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

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

  597.                     break;

  598.                 case CODEC_ID_ATRAC3:

  599.                 case CODEC_ID_COOK:

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

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

  602.                     break;

  603.             }

  604. 

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

  606.                 return -1;

  607.             else {

  608.                 rm->sub_packet_cnt = 0;

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

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

  611.                 // Release first audio packet

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

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

  614.                 *timestamp = rm->audiotimestamp;

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

  616.             }

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

  618.             int x;

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

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

  621.             if (rm->sub_packet_cnt) {

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

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

  624.                 // Release first audio packet

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

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

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

  628.             }

  629.         } else {

  630.             av_get_packet(pb, pkt, len);

  631.             rm_ac3_swap_bytes(st, pkt);

  632.         }

  633.     } else

  634.         av_get_packet(pb, pkt, len);

  635. 

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

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

  638.         av_free_packet(pkt);

  639.         return -1;

  640.     }

  641. 

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

  643. 

  644. #if 0

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

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

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

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

  649. 

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

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

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

  653.         }

  654.     }

  655. #endif

  656. 

  657.     pkt->pts= *timestamp;

  658.     if (*flags & 2)

  659.         pkt->flags |= PKT_FLAG_KEY;

  660. 

  661.     return st->codec->codec_type == CODEC_TYPE_AUDIO ? rm->audio_pkt_cnt : 0;

  662. }

  663. 

  664. void

  665. ff_rm_retrieve_cache (AVFormatContext *s, ByteIOContext *pb,

  666.                       AVStream *st, AVPacket *pkt)

  667. {

  668.     RMDemuxContext *rm = s->priv_data;

  669. 

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

  671. 

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

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

  674.     else {

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

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

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

  678.                st->codec->block_align);

  679.     }

  680.     rm->audio_pkt_cnt--;

  681.     pkt->flags = 0;

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

  683. }

  684. 

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

  686. {

  687.     RMDemuxContext *rm = s->priv_data;

  688.     ByteIOContext *pb = s->pb;

  689.     AVStream *st;

  690.     int i, len;

  691.     int64_t timestamp, pos;

  692.     int flags;

  693. 

  694.     if (rm->audio_pkt_cnt) {

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

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

  697.         ff_rm_retrieve_cache(s, s->pb, st, pkt);

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

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

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

  701.             int x, y;

  702. 

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

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

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

  706.                         return AVERROR(EIO);

  707.             rm->audio_stream_num = 0;

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

  709.             // Release first audio packet

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

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

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

  713.             pkt->stream_index = 0;

  714.         } else {

  715.             /* just read raw bytes */

  716.             len = RAW_PACKET_SIZE;

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

  718.             pkt->stream_index = 0;

  719.             if (len <= 0) {

  720.                 return AVERROR(EIO);

  721.             }

  722.             pkt->size = len;

  723.         }

  724.         rm_ac3_swap_bytes(st, pkt);

  725.     } else {

  726.         int seq=1;

  727. resync:

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

  729.         if(len<0)

  730.             return AVERROR(EIO);

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

  732. 

  733.         if (ff_rm_parse_packet (s, s->pb, st, len, pkt, &seq, &flags, &timestamp) < 0)

  734.             goto resync;

  735. 

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

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

  738.     }

  739. 

  740.     return 0;

  741. }

  742. 

  743. static int rm_read_close(AVFormatContext *s)

  744. {

  745.     RMDemuxContext *rm = s->priv_data;

  746. 

  747.     av_free(rm->audiobuf);

  748.     av_free(rm->videobuf);

  749.     return 0;

  750. }

  751. 

  752. static int rm_probe(AVProbeData *p)

  753. {

  754.     /* check file header */

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

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

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

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

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

  760.         return AVPROBE_SCORE_MAX;

  761.     else

  762.         return 0;

  763. }

  764. 

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

  766.                                int64_t *ppos, int64_t pos_limit)

  767. {

  768.     RMDemuxContext *rm = s->priv_data;

  769.     int64_t pos, dts;

  770.     int stream_index2, flags, len, h;

  771. 

  772.     pos = *ppos;

  773. 

  774.     if(rm->old_format)

  775.         return AV_NOPTS_VALUE;

  776. 

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

  778.     rm->remaining_len=0;

  779.     for(;;){

  780.         int seq=1;

  781.         AVStream *st;

  782. 

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

  784.         if(len<0)

  785.             return AV_NOPTS_VALUE;

  786. 

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

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

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

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

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

  792.             }

  793.         }

  794. 

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

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

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

  798.             if(stream_index2 == stream_index)

  799.                 break;

  800.         }

  801. 

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

  803.     }

  804.     *ppos = pos;

  805.     return dts;

  806. }

  807. 

  808. AVInputFormat rm_demuxer = {

  809.     "rm",

  810.     NULL_IF_CONFIG_SMALL("RM format"),

  811.     sizeof(RMDemuxContext),

  812.     rm_probe,

  813.     rm_read_header,

  814.     rm_read_packet,

  815.     rm_read_close,

  816.     NULL,

  817.     rm_read_dts,

  818. };

  819. 

  820. AVInputFormat rdt_demuxer = {

  821.     "rdt",

  822.     NULL_IF_CONFIG_SMALL("RDT demuxer"),

  823.     sizeof(RMDemuxContext),

  824.     NULL, NULL, NULL, rm_read_close, NULL, NULL

  825. };