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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.     int i;

  78. 

  79.     /* ra type header */

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

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

  82.         int64_t startpos = url_ftell(pb);

  83.         /* very old version */

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

  85.             get_byte(pb);

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

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

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

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

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

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

  92.             get_byte(pb);

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

  94.         }

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

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

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

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

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

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

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

  102.     } else {

  103.         int flavor, sub_packet_h, coded_framesize, sub_packet_size;

  104.         /* old version (4) */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  119.             get_be16(pb); get_be16(pb); get_be16(pb); }

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

  121.         get_be32(pb);

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

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

  124.             get_be32(pb);

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

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

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

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

  129.             buf[4] = 0;

  130.         } else {

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

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

  133.         }

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

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

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

  137.             st->need_parsing = AVSTREAM_PARSE_FULL;

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

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

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

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

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

  143. 

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

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

  146.                 return -1;

  147.             }

  148. 

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

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

  151.             int codecdata_length, i;

  152.             get_be16(pb); get_byte(pb);

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

  154.                 get_byte(pb);

  155.             codecdata_length = get_be32(pb);

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

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

  158.                 return -1;

  159.             }

  160. 

  161.             if(sub_packet_size <= 0){

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

  163.                 return -1;

  164.             }

  165. 

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

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

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

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

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

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

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

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

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

  175. 

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

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

  178.                 return -1;

  179.             }

  180. 

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

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

  183.             int codecdata_length, i;

  184.             get_be16(pb); get_byte(pb);

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

  186.                 get_byte(pb);

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

  188.             codecdata_length = get_be32(pb);

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

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

  191.                 return -1;

  192.             }

  193.             if (codecdata_length >= 1) {

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

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

  196.                 get_byte(pb);

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

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

  199.             }

  200.         } else {

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

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

  203.         }

  204.         if (read_all) {

  205.             get_byte(pb);

  206.             get_byte(pb);

  207.             get_byte(pb);

  208. 

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

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

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

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

  213.         }

  214.     }

  215.     return 0;

  216. }

  217. 

  218. int

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

  220.                            AVStream *st, int codec_data_size)

  221. {

  222.     unsigned int v;

  223.     int size;

  224.     int64_t codec_pos;

  225. 

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

  227.     codec_pos = url_ftell(pb);

  228.     v = get_be32(pb);

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

  230.         /* ra type header */

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

  232.             return -1;

  233.     } else {

  234.         int fps, fps2;

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

  236.         fail1:

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

  238.             goto skip;

  239.         }

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

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

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

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

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

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

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

  247.             goto fail1;

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

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

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

  251.         fps= get_be16(pb);

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

  253.         get_be32(pb);

  254.         fps2= get_be16(pb);

  255.         get_be16(pb);

  256. 

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

  258. 

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

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

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

  262.             return -1;

  263.         }

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

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

  266.             return AVERROR(ENOMEM);

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

  268. 

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

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

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

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

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

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

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

  276.         default: goto fail1;

  277.         }

  278.     }

  279. 

  280. skip:

  281.     /* skip codec info */

  282.     size = url_ftell(pb) - codec_pos;

  283.     url_fskip(pb, codec_data_size - size);

  284. 

  285.     return 0;

  286. }

  287. 

  288. 

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

  290. {

  291.     RMDemuxContext *rm = s->priv_data;

  292.     AVStream *st;

  293. 

  294.     rm->old_format = 1;

  295.     st = av_new_stream(s, 0);

  296.     if (!st)

  297.         return -1;

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

  299. }

  300. 

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

  302. {

  303.     RMDemuxContext *rm = s->priv_data;

  304.     AVStream *st;

  305.     ByteIOContext *pb = s->pb;

  306.     unsigned int tag;

  307.     int tag_size;

  308.     unsigned int start_time, duration;

  309.     char buf[128];

  310.     int flags = 0;

  311. 

  312.     tag = get_le32(pb);

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

  314.         /* very old .ra format */

  315.         return rm_read_header_old(s, ap);

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

  317.         return AVERROR(EIO);

  318.     }

  319. 

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

  321.     get_be16(pb);

  322.     get_be32(pb);

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

  324. 

  325.     for(;;) {

  326.         if (url_feof(pb))

  327.             return -1;

  328.         tag = get_le32(pb);

  329.         tag_size = get_be32(pb);

  330.         get_be16(pb);

  331. #if 0

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

  333.                (tag) & 0xff,

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

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

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

  337.                tag,

  338.                tag_size);

  339. #endif

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

  341.             return -1;

  342.         switch(tag) {

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

  344.             /* file header */

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

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

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

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

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

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

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

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

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

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

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

  356.             break;

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

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

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

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

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

  362.             break;

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

  364.             st = av_new_stream(s, 0);

  365.             if (!st)

  366.                 return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  375.             st->start_time = start_time;

  376.             st->duration = duration;

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

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

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

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

  381.                 return -1;

  382.             break;

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

  384.             goto header_end;

  385.         default:

  386.             /* unknown tag: skip it */

  387.             url_fskip(pb, tag_size - 10);

  388.             break;

  389.         }

  390.     }

  391.  header_end:

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

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

  394.         rm->nb_packets = 3600 * 25;

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

  396.     rm->curpic_num = -1;

  397.     return 0;

  398. }

  399. 

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

  401. {

  402.     int n, n1;

  403. 

  404.     n = get_be16(pb);

  405.     (*len)-=2;

  406.     n &= 0x7FFF;

  407.     if (n >= 0x4000) {

  408.         return n - 0x4000;

  409.     } else {

  410.         n1 = get_be16(pb);

  411.         (*len)-=2;

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

  413.     }

  414. }

  415. 

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

  417. #define RAW_PACKET_SIZE 1000

  418. 

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

  420.     RMDemuxContext *rm = s->priv_data;

  421.     ByteIOContext *pb = s->pb;

  422.     int len, num, res, i;

  423.     AVStream *st;

  424.     uint32_t state=0xFFFFFFFF;

  425. 

  426.     while(!url_feof(pb)){

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

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

  429.             num= rm->current_stream;

  430.             len= rm->remaining_len;

  431.             *timestamp = AV_NOPTS_VALUE;

  432.             *flags= 0;

  433.         }else{

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

  435. 

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

  437.                 len = get_be16(pb) - 6;

  438.                 if(len<0)

  439.                     continue;

  440.                 goto skip;

  441.             }

  442. 

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

  444.                 continue;

  445.             len=state;

  446.             state= 0xFFFFFFFF;

  447. 

  448.             num = get_be16(pb);

  449.             *timestamp = get_be32(pb);

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

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

  452. 

  453. 

  454.             len -= 12;

  455.         }

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

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

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

  459.                 break;

  460.         }

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

  462. skip:

  463.             /* skip packet if unknown number */

  464.             url_fskip(pb, len);

  465.             rm->remaining_len -= len;

  466.             continue;

  467.         }

  468.         *stream_index= i;

  469. 

  470.         return len;

  471.     }

  472.     return -1;

  473. }

  474. 

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

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

  477. {

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

  479.     int type;

  480. 

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

  482.     type = hdr >> 6;

  483.     switch(type){

  484.     case 0: // slice

  485.     case 2: // last slice

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

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

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

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

  490.         rm->remaining_len = len;

  491.         break;

  492.     case 1: //whole frame

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

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

  495.             return AVERROR(EIO);

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

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

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

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

  500.         rm->remaining_len = 0;

  501.         return 0;

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

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

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

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

  506.         rm->remaining_len = len - len2;

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

  508.             return AVERROR(EIO);

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

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

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

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

  513.         return 0;

  514.     }

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

  516. 

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

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

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

  520.         av_free(rm->videobuf);

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

  522.             return AVERROR(ENOMEM);

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

  524.         rm->cur_slice = 0;

  525.         rm->curpic_num = pic_num;

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

  527.     }

  528.     if(type == 2)

  529.         len = FFMIN(len, pos);

  530. 

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

  532.         return 1;

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

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

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

  536.         return 1;

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

  538.         return AVERROR(EIO);

  539.     rm->videobufpos += len;

  540.     rm->remaining_len-= len;

  541. 

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

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

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

  545.              return AVERROR(ENOMEM);

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

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

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

  549.          pkt->pts = AV_NOPTS_VALUE;

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

  551.          return 0;

  552.     }

  553. 

  554.     return 1;

  555. }

  556. 

  557. static inline void

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

  559. {

  560.     uint8_t *ptr;

  561.     int j;

  562. 

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

  564.         ptr = pkt->data;

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

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

  567.             ptr += 2;

  568.         }

  569.     }

  570. }

  571. 

  572. int

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

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

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

  576. {

  577.     RMDemuxContext *rm = s->priv_data;

  578. 

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

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

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

  582.             return -1; //got partial frame

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

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

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

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

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

  588.             int x;

  589.             int sps = rm->sub_packet_size;

  590.             int cfs = rm->coded_framesize;

  591.             int h = rm->sub_packet_h;

  592.             int y = rm->sub_packet_cnt;

  593.             int w = rm->audio_framesize;

  594. 

  595.             if (*flags & 2)

  596.                 y = rm->sub_packet_cnt = 0;

  597.             if (!y)

  598.                 rm->audiotimestamp = *timestamp;

  599. 

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

  601.                 case CODEC_ID_RA_288:

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

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

  604.                     break;

  605.                 case CODEC_ID_ATRAC3:

  606.                 case CODEC_ID_COOK:

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

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

  609.                     break;

  610.             }

  611. 

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

  613.                 return -1;

  614.             else {

  615.                 rm->sub_packet_cnt = 0;

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

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

  618.                 // Release first audio packet

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

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

  621.                 *timestamp = rm->audiotimestamp;

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

  623.             }

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

  625.             int x;

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

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

  628.             if (rm->sub_packet_cnt) {

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

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

  631.                 // Release first audio packet

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

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

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

  635.             }

  636.         } else {

  637.             av_get_packet(pb, pkt, len);

  638.             rm_ac3_swap_bytes(st, pkt);

  639.         }

  640.     } else

  641.         av_get_packet(pb, pkt, len);

  642. 

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

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

  645.         av_free_packet(pkt);

  646.         return -1;

  647.     }

  648. 

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

  650. 

  651. #if 0

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

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

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

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

  656. 

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

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

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

  660.         }

  661.     }

  662. #endif

  663. 

  664.     pkt->pts= *timestamp;

  665.     if (*flags & 2)

  666.         pkt->flags |= PKT_FLAG_KEY;

  667. 

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

  669. }

  670. 

  671. void

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

  673.                       AVStream *st, AVPacket *pkt)

  674. {

  675.     RMDemuxContext *rm = s->priv_data;

  676. 

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

  678. 

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

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

  681.     else {

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

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

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

  685.                st->codec->block_align);

  686.     }

  687.     rm->audio_pkt_cnt--;

  688.     pkt->flags = 0;

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

  690. }

  691. 

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

  693. {

  694.     RMDemuxContext *rm = s->priv_data;

  695.     ByteIOContext *pb = s->pb;

  696.     AVStream *st;

  697.     int i, len;

  698.     int64_t timestamp, pos;

  699.     int flags;

  700. 

  701.     if (rm->audio_pkt_cnt) {

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

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

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

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

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

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

  708.             int x, y;

  709. 

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

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

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

  713.                         return AVERROR(EIO);

  714.             rm->audio_stream_num = 0;

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

  716.             // Release first audio packet

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

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

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

  720.             pkt->stream_index = 0;

  721.         } else {

  722.             /* just read raw bytes */

  723.             len = RAW_PACKET_SIZE;

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

  725.             pkt->stream_index = 0;

  726.             if (len <= 0) {

  727.                 return AVERROR(EIO);

  728.             }

  729.             pkt->size = len;

  730.         }

  731.         rm_ac3_swap_bytes(st, pkt);

  732.     } else {

  733.         int seq=1;

  734. resync:

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

  736.         if(len<0)

  737.             return AVERROR(EIO);

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

  739. 

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

  741.             goto resync;

  742. 

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

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

  745.     }

  746. 

  747.     return 0;

  748. }

  749. 

  750. static int rm_read_close(AVFormatContext *s)

  751. {

  752.     RMDemuxContext *rm = s->priv_data;

  753. 

  754.     av_free(rm->audiobuf);

  755.     av_free(rm->videobuf);

  756.     return 0;

  757. }

  758. 

  759. static int rm_probe(AVProbeData *p)

  760. {

  761.     /* check file header */

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

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

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

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

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

  767.         return AVPROBE_SCORE_MAX;

  768.     else

  769.         return 0;

  770. }

  771. 

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

  773.                                int64_t *ppos, int64_t pos_limit)

  774. {

  775.     RMDemuxContext *rm = s->priv_data;

  776.     int64_t pos, dts;

  777.     int stream_index2, flags, len, h;

  778. 

  779.     pos = *ppos;

  780. 

  781.     if(rm->old_format)

  782.         return AV_NOPTS_VALUE;

  783. 

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

  785.     rm->remaining_len=0;

  786.     for(;;){

  787.         int seq=1;

  788.         AVStream *st;

  789. 

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

  791.         if(len<0)

  792.             return AV_NOPTS_VALUE;

  793. 

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

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

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

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

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

  799.             }

  800.         }

  801. 

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

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

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

  805.             if(stream_index2 == stream_index)

  806.                 break;

  807.         }

  808. 

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

  810.     }

  811.     *ppos = pos;

  812.     return dts;

  813. }

  814. 

  815. AVInputFormat rm_demuxer = {

  816.     "rm",

  817.     NULL_IF_CONFIG_SMALL("RM format"),

  818.     sizeof(RMDemuxContext),

  819.     rm_probe,

  820.     rm_read_header,

  821.     rm_read_packet,

  822.     rm_read_close,

  823.     NULL,

  824.     rm_read_dts,

  825. };

  826. 

  827. AVInputFormat rdt_demuxer = {

  828.     "rdt",

  829.     NULL_IF_CONFIG_SMALL("RDT demuxer"),

  830.     sizeof(RMDemuxContext),

  831.     NULL, NULL, NULL, rm_read_close, NULL, NULL

  832. };