Libav 0.7.1
libavformat/rmdec.c
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00001 /*
00002  * "Real" compatible demuxer.
00003  * Copyright (c) 2000, 2001 Fabrice Bellard
00004  *
00005  * This file is part of Libav.
00006  *
00007  * Libav is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * Libav is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with Libav; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #include "libavutil/avstring.h"
00023 #include "libavutil/intreadwrite.h"
00024 #include "libavutil/dict.h"
00025 #include "avformat.h"
00026 #include "riff.h"
00027 #include "rm.h"
00028 
00029 struct RMStream {
00030     AVPacket pkt;      
00031     int videobufsize;  
00032     int videobufpos;   
00033     int curpic_num;    
00034     int cur_slice, slices;
00035     int64_t pktpos;    
00036 
00037     int64_t audiotimestamp; 
00038     int sub_packet_cnt; // Subpacket counter, used while reading
00039     int sub_packet_size, sub_packet_h, coded_framesize; 
00040     int audio_framesize; 
00041     int sub_packet_lengths[16]; 
00042 };
00043 
00044 typedef struct {
00045     int nb_packets;
00046     int old_format;
00047     int current_stream;
00048     int remaining_len;
00049     int audio_stream_num; 
00050     int audio_pkt_cnt; 
00051 } RMDemuxContext;
00052 
00053 static const unsigned char sipr_swaps[38][2] = {
00054     {  0, 63 }, {  1, 22 }, {  2, 44 }, {  3, 90 },
00055     {  5, 81 }, {  7, 31 }, {  8, 86 }, {  9, 58 },
00056     { 10, 36 }, { 12, 68 }, { 13, 39 }, { 14, 73 },
00057     { 15, 53 }, { 16, 69 }, { 17, 57 }, { 19, 88 },
00058     { 20, 34 }, { 21, 71 }, { 24, 46 }, { 25, 94 },
00059     { 26, 54 }, { 28, 75 }, { 29, 50 }, { 32, 70 },
00060     { 33, 92 }, { 35, 74 }, { 38, 85 }, { 40, 56 },
00061     { 42, 87 }, { 43, 65 }, { 45, 59 }, { 48, 79 },
00062     { 49, 93 }, { 51, 89 }, { 55, 95 }, { 61, 76 },
00063     { 67, 83 }, { 77, 80 }
00064 };
00065 
00066 const unsigned char ff_sipr_subpk_size[4] = { 29, 19, 37, 20 };
00067 
00068 static inline void get_strl(AVIOContext *pb, char *buf, int buf_size, int len)
00069 {
00070     int i;
00071     char *q, r;
00072 
00073     q = buf;
00074     for(i=0;i<len;i++) {
00075         r = avio_r8(pb);
00076         if (i < buf_size - 1)
00077             *q++ = r;
00078     }
00079     if (buf_size > 0) *q = '\0';
00080 }
00081 
00082 static void get_str8(AVIOContext *pb, char *buf, int buf_size)
00083 {
00084     get_strl(pb, buf, buf_size, avio_r8(pb));
00085 }
00086 
00087 static int rm_read_extradata(AVIOContext *pb, AVCodecContext *avctx, unsigned size)
00088 {
00089     if (size >= 1<<24)
00090         return -1;
00091     avctx->extradata = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
00092     if (!avctx->extradata)
00093         return AVERROR(ENOMEM);
00094     avctx->extradata_size = avio_read(pb, avctx->extradata, size);
00095     memset(avctx->extradata + avctx->extradata_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
00096     if (avctx->extradata_size != size)
00097         return AVERROR(EIO);
00098     return 0;
00099 }
00100 
00101 static void rm_read_metadata(AVFormatContext *s, int wide)
00102 {
00103     char buf[1024];
00104     int i;
00105     for (i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
00106         int len = wide ? avio_rb16(s->pb) : avio_r8(s->pb);
00107         get_strl(s->pb, buf, sizeof(buf), len);
00108         av_dict_set(&s->metadata, ff_rm_metadata[i], buf, 0);
00109     }
00110 }
00111 
00112 RMStream *ff_rm_alloc_rmstream (void)
00113 {
00114     RMStream *rms = av_mallocz(sizeof(RMStream));
00115     rms->curpic_num = -1;
00116     return rms;
00117 }
00118 
00119 void ff_rm_free_rmstream (RMStream *rms)
00120 {
00121     av_free_packet(&rms->pkt);
00122 }
00123 
00124 static int rm_read_audio_stream_info(AVFormatContext *s, AVIOContext *pb,
00125                                      AVStream *st, RMStream *ast, int read_all)
00126 {
00127     char buf[256];
00128     uint32_t version;
00129     int ret;
00130 
00131     /* ra type header */
00132     version = avio_rb16(pb); /* version */
00133     if (version == 3) {
00134         int header_size = avio_rb16(pb);
00135         int64_t startpos = avio_tell(pb);
00136         avio_skip(pb, 14);
00137         rm_read_metadata(s, 0);
00138         if ((startpos + header_size) >= avio_tell(pb) + 2) {
00139             // fourcc (should always be "lpcJ")
00140             avio_r8(pb);
00141             get_str8(pb, buf, sizeof(buf));
00142         }
00143         // Skip extra header crap (this should never happen)
00144         if ((startpos + header_size) > avio_tell(pb))
00145             avio_skip(pb, header_size + startpos - avio_tell(pb));
00146         st->codec->sample_rate = 8000;
00147         st->codec->channels = 1;
00148         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00149         st->codec->codec_id = CODEC_ID_RA_144;
00150     } else {
00151         int flavor, sub_packet_h, coded_framesize, sub_packet_size;
00152         int codecdata_length;
00153         /* old version (4) */
00154         avio_skip(pb, 2); /* unused */
00155         avio_rb32(pb); /* .ra4 */
00156         avio_rb32(pb); /* data size */
00157         avio_rb16(pb); /* version2 */
00158         avio_rb32(pb); /* header size */
00159         flavor= avio_rb16(pb); /* add codec info / flavor */
00160         ast->coded_framesize = coded_framesize = avio_rb32(pb); /* coded frame size */
00161         avio_rb32(pb); /* ??? */
00162         avio_rb32(pb); /* ??? */
00163         avio_rb32(pb); /* ??? */
00164         ast->sub_packet_h = sub_packet_h = avio_rb16(pb); /* 1 */
00165         st->codec->block_align= avio_rb16(pb); /* frame size */
00166         ast->sub_packet_size = sub_packet_size = avio_rb16(pb); /* sub packet size */
00167         avio_rb16(pb); /* ??? */
00168         if (version == 5) {
00169             avio_rb16(pb); avio_rb16(pb); avio_rb16(pb);
00170         }
00171         st->codec->sample_rate = avio_rb16(pb);
00172         avio_rb32(pb);
00173         st->codec->channels = avio_rb16(pb);
00174         if (version == 5) {
00175             avio_rb32(pb);
00176             avio_read(pb, buf, 4);
00177             buf[4] = 0;
00178         } else {
00179             get_str8(pb, buf, sizeof(buf)); /* desc */
00180             get_str8(pb, buf, sizeof(buf)); /* desc */
00181         }
00182         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00183         st->codec->codec_tag  = AV_RL32(buf);
00184         st->codec->codec_id   = ff_codec_get_id(ff_rm_codec_tags,
00185                                                 st->codec->codec_tag);
00186         switch (st->codec->codec_id) {
00187         case CODEC_ID_AC3:
00188             st->need_parsing = AVSTREAM_PARSE_FULL;
00189             break;
00190         case CODEC_ID_RA_288:
00191             st->codec->extradata_size= 0;
00192             ast->audio_framesize = st->codec->block_align;
00193             st->codec->block_align = coded_framesize;
00194 
00195             if(ast->audio_framesize >= UINT_MAX / sub_packet_h){
00196                 av_log(s, AV_LOG_ERROR, "ast->audio_framesize * sub_packet_h too large\n");
00197                 return -1;
00198             }
00199 
00200             av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h);
00201             break;
00202         case CODEC_ID_COOK:
00203         case CODEC_ID_ATRAC3:
00204         case CODEC_ID_SIPR:
00205             avio_rb16(pb); avio_r8(pb);
00206             if (version == 5)
00207                 avio_r8(pb);
00208             codecdata_length = avio_rb32(pb);
00209             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
00210                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
00211                 return -1;
00212             }
00213 
00214             ast->audio_framesize = st->codec->block_align;
00215             if (st->codec->codec_id == CODEC_ID_SIPR) {
00216                 if (flavor > 3) {
00217                     av_log(s, AV_LOG_ERROR, "bad SIPR file flavor %d\n",
00218                            flavor);
00219                     return -1;
00220                 }
00221                 st->codec->block_align = ff_sipr_subpk_size[flavor];
00222             } else {
00223                 if(sub_packet_size <= 0){
00224                     av_log(s, AV_LOG_ERROR, "sub_packet_size is invalid\n");
00225                     return -1;
00226                 }
00227                 st->codec->block_align = ast->sub_packet_size;
00228             }
00229             if ((ret = rm_read_extradata(pb, st->codec, codecdata_length)) < 0)
00230                 return ret;
00231 
00232             if(ast->audio_framesize >= UINT_MAX / sub_packet_h){
00233                 av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
00234                 return -1;
00235             }
00236 
00237             av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h);
00238             break;
00239         case CODEC_ID_AAC:
00240             avio_rb16(pb); avio_r8(pb);
00241             if (version == 5)
00242                 avio_r8(pb);
00243             codecdata_length = avio_rb32(pb);
00244             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
00245                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
00246                 return -1;
00247             }
00248             if (codecdata_length >= 1) {
00249                 avio_r8(pb);
00250                 if ((ret = rm_read_extradata(pb, st->codec, codecdata_length - 1)) < 0)
00251                     return ret;
00252             }
00253             break;
00254         default:
00255             av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));
00256         }
00257         if (read_all) {
00258             avio_r8(pb);
00259             avio_r8(pb);
00260             avio_r8(pb);
00261             rm_read_metadata(s, 0);
00262         }
00263     }
00264     return 0;
00265 }
00266 
00267 int
00268 ff_rm_read_mdpr_codecdata (AVFormatContext *s, AVIOContext *pb,
00269                            AVStream *st, RMStream *rst, int codec_data_size)
00270 {
00271     unsigned int v;
00272     int size;
00273     int64_t codec_pos;
00274     int ret;
00275 
00276     av_set_pts_info(st, 64, 1, 1000);
00277     codec_pos = avio_tell(pb);
00278     v = avio_rb32(pb);
00279     if (v == MKTAG(0xfd, 'a', 'r', '.')) {
00280         /* ra type header */
00281         if (rm_read_audio_stream_info(s, pb, st, rst, 0))
00282             return -1;
00283     } else {
00284         int fps;
00285         if (avio_rl32(pb) != MKTAG('V', 'I', 'D', 'O')) {
00286         fail1:
00287             av_log(st->codec, AV_LOG_ERROR, "Unsupported video codec\n");
00288             goto skip;
00289         }
00290         st->codec->codec_tag = avio_rl32(pb);
00291         st->codec->codec_id  = ff_codec_get_id(ff_rm_codec_tags,
00292                                                st->codec->codec_tag);
00293 //        av_log(s, AV_LOG_DEBUG, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));
00294         if (st->codec->codec_id == CODEC_ID_NONE)
00295             goto fail1;
00296         st->codec->width = avio_rb16(pb);
00297         st->codec->height = avio_rb16(pb);
00298         st->codec->time_base.num= 1;
00299         fps= avio_rb16(pb);
00300         st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00301         avio_rb32(pb);
00302         avio_skip(pb, 2);
00303         avio_rb16(pb);
00304 
00305         if ((ret = rm_read_extradata(pb, st->codec, codec_data_size - (avio_tell(pb) - codec_pos))) < 0)
00306             return ret;
00307 
00308 //        av_log(s, AV_LOG_DEBUG, "fps= %d fps2= %d\n", fps, fps2);
00309         st->codec->time_base.den = fps * st->codec->time_base.num;
00310         //XXX: do we really need that?
00311         switch(st->codec->extradata[4]>>4){
00312         case 1: st->codec->codec_id = CODEC_ID_RV10; break;
00313         case 2: st->codec->codec_id = CODEC_ID_RV20; break;
00314         case 3: st->codec->codec_id = CODEC_ID_RV30; break;
00315         case 4: st->codec->codec_id = CODEC_ID_RV40; break;
00316         default:
00317             av_log(st->codec, AV_LOG_ERROR, "extra:%02X %02X %02X %02X %02X\n", st->codec->extradata[0], st->codec->extradata[1], st->codec->extradata[2], st->codec->extradata[3], st->codec->extradata[4]);
00318             goto fail1;
00319         }
00320     }
00321 
00322 skip:
00323     /* skip codec info */
00324     size = avio_tell(pb) - codec_pos;
00325     avio_skip(pb, codec_data_size - size);
00326 
00327     return 0;
00328 }
00329 
00332 static int rm_read_index(AVFormatContext *s)
00333 {
00334     AVIOContext *pb = s->pb;
00335     unsigned int size, n_pkts, str_id, next_off, n, pos, pts;
00336     AVStream *st;
00337 
00338     do {
00339         if (avio_rl32(pb) != MKTAG('I','N','D','X'))
00340             return -1;
00341         size     = avio_rb32(pb);
00342         if (size < 20)
00343             return -1;
00344         avio_skip(pb, 2);
00345         n_pkts   = avio_rb32(pb);
00346         str_id   = avio_rb16(pb);
00347         next_off = avio_rb32(pb);
00348         for (n = 0; n < s->nb_streams; n++)
00349             if (s->streams[n]->id == str_id) {
00350                 st = s->streams[n];
00351                 break;
00352             }
00353         if (n == s->nb_streams)
00354             goto skip;
00355 
00356         for (n = 0; n < n_pkts; n++) {
00357             avio_skip(pb, 2);
00358             pts = avio_rb32(pb);
00359             pos = avio_rb32(pb);
00360             avio_skip(pb, 4); /* packet no. */
00361 
00362             av_add_index_entry(st, pos, pts, 0, 0, AVINDEX_KEYFRAME);
00363         }
00364 
00365 skip:
00366         if (next_off && avio_tell(pb) != next_off &&
00367             avio_seek(pb, next_off, SEEK_SET) < 0)
00368             return -1;
00369     } while (next_off);
00370 
00371     return 0;
00372 }
00373 
00374 static int rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap)
00375 {
00376     RMDemuxContext *rm = s->priv_data;
00377     AVStream *st;
00378 
00379     rm->old_format = 1;
00380     st = av_new_stream(s, 0);
00381     if (!st)
00382         return -1;
00383     st->priv_data = ff_rm_alloc_rmstream();
00384     return rm_read_audio_stream_info(s, s->pb, st, st->priv_data, 1);
00385 }
00386 
00387 static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
00388 {
00389     RMDemuxContext *rm = s->priv_data;
00390     AVStream *st;
00391     AVIOContext *pb = s->pb;
00392     unsigned int tag;
00393     int tag_size;
00394     unsigned int start_time, duration;
00395     unsigned int data_off = 0, indx_off = 0;
00396     char buf[128];
00397     int flags = 0;
00398 
00399     tag = avio_rl32(pb);
00400     if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
00401         /* very old .ra format */
00402         return rm_read_header_old(s, ap);
00403     } else if (tag != MKTAG('.', 'R', 'M', 'F')) {
00404         return AVERROR(EIO);
00405     }
00406 
00407     avio_rb32(pb); /* header size */
00408     avio_rb16(pb);
00409     avio_rb32(pb);
00410     avio_rb32(pb); /* number of headers */
00411 
00412     for(;;) {
00413         if (pb->eof_reached)
00414             return -1;
00415         tag = avio_rl32(pb);
00416         tag_size = avio_rb32(pb);
00417         avio_rb16(pb);
00418         av_dlog(s, "tag=%c%c%c%c (%08x) size=%d\n",
00419                 (tag      ) & 0xff,
00420                 (tag >>  8) & 0xff,
00421                 (tag >> 16) & 0xff,
00422                 (tag >> 24) & 0xff,
00423                 tag,
00424                 tag_size);
00425         if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
00426             return -1;
00427         switch(tag) {
00428         case MKTAG('P', 'R', 'O', 'P'):
00429             /* file header */
00430             avio_rb32(pb); /* max bit rate */
00431             avio_rb32(pb); /* avg bit rate */
00432             avio_rb32(pb); /* max packet size */
00433             avio_rb32(pb); /* avg packet size */
00434             avio_rb32(pb); /* nb packets */
00435             avio_rb32(pb); /* duration */
00436             avio_rb32(pb); /* preroll */
00437             indx_off = avio_rb32(pb); /* index offset */
00438             data_off = avio_rb32(pb); /* data offset */
00439             avio_rb16(pb); /* nb streams */
00440             flags = avio_rb16(pb); /* flags */
00441             break;
00442         case MKTAG('C', 'O', 'N', 'T'):
00443             rm_read_metadata(s, 1);
00444             break;
00445         case MKTAG('M', 'D', 'P', 'R'):
00446             st = av_new_stream(s, 0);
00447             if (!st)
00448                 return AVERROR(ENOMEM);
00449             st->id = avio_rb16(pb);
00450             avio_rb32(pb); /* max bit rate */
00451             st->codec->bit_rate = avio_rb32(pb); /* bit rate */
00452             avio_rb32(pb); /* max packet size */
00453             avio_rb32(pb); /* avg packet size */
00454             start_time = avio_rb32(pb); /* start time */
00455             avio_rb32(pb); /* preroll */
00456             duration = avio_rb32(pb); /* duration */
00457             st->start_time = start_time;
00458             st->duration = duration;
00459             get_str8(pb, buf, sizeof(buf)); /* desc */
00460             get_str8(pb, buf, sizeof(buf)); /* mimetype */
00461             st->codec->codec_type = AVMEDIA_TYPE_DATA;
00462             st->priv_data = ff_rm_alloc_rmstream();
00463             if (ff_rm_read_mdpr_codecdata(s, s->pb, st, st->priv_data,
00464                                           avio_rb32(pb)) < 0)
00465                 return -1;
00466             break;
00467         case MKTAG('D', 'A', 'T', 'A'):
00468             goto header_end;
00469         default:
00470             /* unknown tag: skip it */
00471             avio_skip(pb, tag_size - 10);
00472             break;
00473         }
00474     }
00475  header_end:
00476     rm->nb_packets = avio_rb32(pb); /* number of packets */
00477     if (!rm->nb_packets && (flags & 4))
00478         rm->nb_packets = 3600 * 25;
00479     avio_rb32(pb); /* next data header */
00480 
00481     if (!data_off)
00482         data_off = avio_tell(pb) - 18;
00483     if (indx_off && pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
00484         avio_seek(pb, indx_off, SEEK_SET) >= 0) {
00485         rm_read_index(s);
00486         avio_seek(pb, data_off + 18, SEEK_SET);
00487     }
00488 
00489     return 0;
00490 }
00491 
00492 static int get_num(AVIOContext *pb, int *len)
00493 {
00494     int n, n1;
00495 
00496     n = avio_rb16(pb);
00497     (*len)-=2;
00498     n &= 0x7FFF;
00499     if (n >= 0x4000) {
00500         return n - 0x4000;
00501     } else {
00502         n1 = avio_rb16(pb);
00503         (*len)-=2;
00504         return (n << 16) | n1;
00505     }
00506 }
00507 
00508 /* multiple of 20 bytes for ra144 (ugly) */
00509 #define RAW_PACKET_SIZE 1000
00510 
00511 static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
00512     RMDemuxContext *rm = s->priv_data;
00513     AVIOContext *pb = s->pb;
00514     AVStream *st;
00515     uint32_t state=0xFFFFFFFF;
00516 
00517     while(!pb->eof_reached){
00518         int len, num, i;
00519         *pos= avio_tell(pb) - 3;
00520         if(rm->remaining_len > 0){
00521             num= rm->current_stream;
00522             len= rm->remaining_len;
00523             *timestamp = AV_NOPTS_VALUE;
00524             *flags= 0;
00525         }else{
00526             state= (state<<8) + avio_r8(pb);
00527 
00528             if(state == MKBETAG('I', 'N', 'D', 'X')){
00529                 int n_pkts, expected_len;
00530                 len = avio_rb32(pb);
00531                 avio_skip(pb, 2);
00532                 n_pkts = avio_rb32(pb);
00533                 expected_len = 20 + n_pkts * 14;
00534                 if (len == 20)
00535                     /* some files don't add index entries to chunk size... */
00536                     len = expected_len;
00537                 else if (len != expected_len)
00538                     av_log(s, AV_LOG_WARNING,
00539                            "Index size %d (%d pkts) is wrong, should be %d.\n",
00540                            len, n_pkts, expected_len);
00541                 len -= 14; // we already read part of the index header
00542                 if(len<0)
00543                     continue;
00544                 goto skip;
00545             } else if (state == MKBETAG('D','A','T','A')) {
00546                 av_log(s, AV_LOG_WARNING,
00547                        "DATA tag in middle of chunk, file may be broken.\n");
00548             }
00549 
00550             if(state > (unsigned)0xFFFF || state <= 12)
00551                 continue;
00552             len=state - 12;
00553             state= 0xFFFFFFFF;
00554 
00555             num = avio_rb16(pb);
00556             *timestamp = avio_rb32(pb);
00557             avio_r8(pb); /* reserved */
00558             *flags = avio_r8(pb); /* flags */
00559         }
00560         for(i=0;i<s->nb_streams;i++) {
00561             st = s->streams[i];
00562             if (num == st->id)
00563                 break;
00564         }
00565         if (i == s->nb_streams) {
00566 skip:
00567             /* skip packet if unknown number */
00568             avio_skip(pb, len);
00569             rm->remaining_len = 0;
00570             continue;
00571         }
00572         *stream_index= i;
00573 
00574         return len;
00575     }
00576     return -1;
00577 }
00578 
00579 static int rm_assemble_video_frame(AVFormatContext *s, AVIOContext *pb,
00580                                    RMDemuxContext *rm, RMStream *vst,
00581                                    AVPacket *pkt, int len, int *pseq)
00582 {
00583     int hdr, seq, pic_num, len2, pos;
00584     int type;
00585 
00586     hdr = avio_r8(pb); len--;
00587     type = hdr >> 6;
00588 
00589     if(type != 3){  // not frame as a part of packet
00590         seq = avio_r8(pb); len--;
00591     }
00592     if(type != 1){  // not whole frame
00593         len2 = get_num(pb, &len);
00594         pos  = get_num(pb, &len);
00595         pic_num = avio_r8(pb); len--;
00596     }
00597     if(len<0)
00598         return -1;
00599     rm->remaining_len = len;
00600     if(type&1){     // frame, not slice
00601         if(type == 3)  // frame as a part of packet
00602             len= len2;
00603         if(rm->remaining_len < len)
00604             return -1;
00605         rm->remaining_len -= len;
00606         if(av_new_packet(pkt, len + 9) < 0)
00607             return AVERROR(EIO);
00608         pkt->data[0] = 0;
00609         AV_WL32(pkt->data + 1, 1);
00610         AV_WL32(pkt->data + 5, 0);
00611         avio_read(pb, pkt->data + 9, len);
00612         return 0;
00613     }
00614     //now we have to deal with single slice
00615 
00616     *pseq = seq;
00617     if((seq & 0x7F) == 1 || vst->curpic_num != pic_num){
00618         vst->slices = ((hdr & 0x3F) << 1) + 1;
00619         vst->videobufsize = len2 + 8*vst->slices + 1;
00620         av_free_packet(&vst->pkt); //FIXME this should be output.
00621         if(av_new_packet(&vst->pkt, vst->videobufsize) < 0)
00622             return AVERROR(ENOMEM);
00623         vst->videobufpos = 8*vst->slices + 1;
00624         vst->cur_slice = 0;
00625         vst->curpic_num = pic_num;
00626         vst->pktpos = avio_tell(pb);
00627     }
00628     if(type == 2)
00629         len = FFMIN(len, pos);
00630 
00631     if(++vst->cur_slice > vst->slices)
00632         return 1;
00633     AV_WL32(vst->pkt.data - 7 + 8*vst->cur_slice, 1);
00634     AV_WL32(vst->pkt.data - 3 + 8*vst->cur_slice, vst->videobufpos - 8*vst->slices - 1);
00635     if(vst->videobufpos + len > vst->videobufsize)
00636         return 1;
00637     if (avio_read(pb, vst->pkt.data + vst->videobufpos, len) != len)
00638         return AVERROR(EIO);
00639     vst->videobufpos += len;
00640     rm->remaining_len-= len;
00641 
00642     if(type == 2 || (vst->videobufpos) == vst->videobufsize){
00643         vst->pkt.data[0] = vst->cur_slice-1;
00644         *pkt= vst->pkt;
00645         vst->pkt.data= NULL;
00646         vst->pkt.size= 0;
00647         if(vst->slices != vst->cur_slice) //FIXME find out how to set slices correct from the begin
00648             memmove(pkt->data + 1 + 8*vst->cur_slice, pkt->data + 1 + 8*vst->slices,
00649                 vst->videobufpos - 1 - 8*vst->slices);
00650         pkt->size = vst->videobufpos + 8*(vst->cur_slice - vst->slices);
00651         pkt->pts = AV_NOPTS_VALUE;
00652         pkt->pos = vst->pktpos;
00653         vst->slices = 0;
00654         return 0;
00655     }
00656 
00657     return 1;
00658 }
00659 
00660 static inline void
00661 rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt)
00662 {
00663     uint8_t *ptr;
00664     int j;
00665 
00666     if (st->codec->codec_id == CODEC_ID_AC3) {
00667         ptr = pkt->data;
00668         for (j=0;j<pkt->size;j+=2) {
00669             FFSWAP(int, ptr[0], ptr[1]);
00670             ptr += 2;
00671         }
00672     }
00673 }
00674 
00679 void ff_rm_reorder_sipr_data(uint8_t *buf, int sub_packet_h, int framesize)
00680 {
00681     int n, bs = sub_packet_h * framesize * 2 / 96; // nibbles per subpacket
00682 
00683     for (n = 0; n < 38; n++) {
00684         int j;
00685         int i = bs * sipr_swaps[n][0];
00686         int o = bs * sipr_swaps[n][1];
00687 
00688         /* swap 4bit-nibbles of block 'i' with 'o' */
00689         for (j = 0; j < bs; j++, i++, o++) {
00690             int x = (buf[i >> 1] >> (4 * (i & 1))) & 0xF,
00691                 y = (buf[o >> 1] >> (4 * (o & 1))) & 0xF;
00692 
00693             buf[o >> 1] = (x << (4 * (o & 1))) |
00694                 (buf[o >> 1] & (0xF << (4 * !(o & 1))));
00695             buf[i >> 1] = (y << (4 * (i & 1))) |
00696                 (buf[i >> 1] & (0xF << (4 * !(i & 1))));
00697         }
00698     }
00699 }
00700 
00701 int
00702 ff_rm_parse_packet (AVFormatContext *s, AVIOContext *pb,
00703                     AVStream *st, RMStream *ast, int len, AVPacket *pkt,
00704                     int *seq, int flags, int64_t timestamp)
00705 {
00706     RMDemuxContext *rm = s->priv_data;
00707 
00708     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
00709         rm->current_stream= st->id;
00710         if(rm_assemble_video_frame(s, pb, rm, ast, pkt, len, seq))
00711             return -1; //got partial frame
00712     } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
00713         if ((st->codec->codec_id == CODEC_ID_RA_288) ||
00714             (st->codec->codec_id == CODEC_ID_COOK) ||
00715             (st->codec->codec_id == CODEC_ID_ATRAC3) ||
00716             (st->codec->codec_id == CODEC_ID_SIPR)) {
00717             int x;
00718             int sps = ast->sub_packet_size;
00719             int cfs = ast->coded_framesize;
00720             int h = ast->sub_packet_h;
00721             int y = ast->sub_packet_cnt;
00722             int w = ast->audio_framesize;
00723 
00724             if (flags & 2)
00725                 y = ast->sub_packet_cnt = 0;
00726             if (!y)
00727                 ast->audiotimestamp = timestamp;
00728 
00729             switch(st->codec->codec_id) {
00730                 case CODEC_ID_RA_288:
00731                     for (x = 0; x < h/2; x++)
00732                         avio_read(pb, ast->pkt.data+x*2*w+y*cfs, cfs);
00733                     break;
00734                 case CODEC_ID_ATRAC3:
00735                 case CODEC_ID_COOK:
00736                     for (x = 0; x < w/sps; x++)
00737                         avio_read(pb, ast->pkt.data+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
00738                     break;
00739                 case CODEC_ID_SIPR:
00740                     avio_read(pb, ast->pkt.data + y * w, w);
00741                     break;
00742             }
00743 
00744             if (++(ast->sub_packet_cnt) < h)
00745                 return -1;
00746             if (st->codec->codec_id == CODEC_ID_SIPR)
00747                 ff_rm_reorder_sipr_data(ast->pkt.data, h, w);
00748 
00749              ast->sub_packet_cnt = 0;
00750              rm->audio_stream_num = st->index;
00751              rm->audio_pkt_cnt = h * w / st->codec->block_align;
00752         } else if (st->codec->codec_id == CODEC_ID_AAC) {
00753             int x;
00754             rm->audio_stream_num = st->index;
00755             ast->sub_packet_cnt = (avio_rb16(pb) & 0xf0) >> 4;
00756             if (ast->sub_packet_cnt) {
00757                 for (x = 0; x < ast->sub_packet_cnt; x++)
00758                     ast->sub_packet_lengths[x] = avio_rb16(pb);
00759                 rm->audio_pkt_cnt = ast->sub_packet_cnt;
00760                 ast->audiotimestamp = timestamp;
00761             } else
00762                 return -1;
00763         } else {
00764             av_get_packet(pb, pkt, len);
00765             rm_ac3_swap_bytes(st, pkt);
00766         }
00767     } else
00768         av_get_packet(pb, pkt, len);
00769 
00770     pkt->stream_index = st->index;
00771 
00772 #if 0
00773     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
00774         if(st->codec->codec_id == CODEC_ID_RV20){
00775             int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
00776             av_log(s, AV_LOG_DEBUG, "%d %"PRId64" %d\n", *timestamp, *timestamp*512LL/25, seq);
00777 
00778             seq |= (timestamp&~0x3FFF);
00779             if(seq - timestamp >  0x2000) seq -= 0x4000;
00780             if(seq - timestamp < -0x2000) seq += 0x4000;
00781         }
00782     }
00783 #endif
00784 
00785     pkt->pts= timestamp;
00786     if (flags & 2)
00787         pkt->flags |= AV_PKT_FLAG_KEY;
00788 
00789     return st->codec->codec_type == AVMEDIA_TYPE_AUDIO ? rm->audio_pkt_cnt : 0;
00790 }
00791 
00792 int
00793 ff_rm_retrieve_cache (AVFormatContext *s, AVIOContext *pb,
00794                       AVStream *st, RMStream *ast, AVPacket *pkt)
00795 {
00796     RMDemuxContext *rm = s->priv_data;
00797 
00798     assert (rm->audio_pkt_cnt > 0);
00799 
00800     if (st->codec->codec_id == CODEC_ID_AAC)
00801         av_get_packet(pb, pkt, ast->sub_packet_lengths[ast->sub_packet_cnt - rm->audio_pkt_cnt]);
00802     else {
00803         av_new_packet(pkt, st->codec->block_align);
00804         memcpy(pkt->data, ast->pkt.data + st->codec->block_align * //FIXME avoid this
00805                (ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
00806                st->codec->block_align);
00807     }
00808     rm->audio_pkt_cnt--;
00809     if ((pkt->pts = ast->audiotimestamp) != AV_NOPTS_VALUE) {
00810         ast->audiotimestamp = AV_NOPTS_VALUE;
00811         pkt->flags = AV_PKT_FLAG_KEY;
00812     } else
00813         pkt->flags = 0;
00814     pkt->stream_index = st->index;
00815 
00816     return rm->audio_pkt_cnt;
00817 }
00818 
00819 static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
00820 {
00821     RMDemuxContext *rm = s->priv_data;
00822     AVStream *st;
00823     int i, len, res, seq = 1;
00824     int64_t timestamp, pos;
00825     int flags;
00826 
00827     for (;;) {
00828         if (rm->audio_pkt_cnt) {
00829             // If there are queued audio packet return them first
00830             st = s->streams[rm->audio_stream_num];
00831             ff_rm_retrieve_cache(s, s->pb, st, st->priv_data, pkt);
00832             flags = 0;
00833         } else {
00834             if (rm->old_format) {
00835                 RMStream *ast;
00836 
00837                 st = s->streams[0];
00838                 ast = st->priv_data;
00839                 timestamp = AV_NOPTS_VALUE;
00840                 len = !ast->audio_framesize ? RAW_PACKET_SIZE :
00841                     ast->coded_framesize * ast->sub_packet_h / 2;
00842                 flags = (seq++ == 1) ? 2 : 0;
00843                 pos = avio_tell(s->pb);
00844             } else {
00845                 len=sync(s, &timestamp, &flags, &i, &pos);
00846                 if (len > 0)
00847                     st = s->streams[i];
00848             }
00849 
00850             if(len<0 || s->pb->eof_reached)
00851                 return AVERROR(EIO);
00852 
00853             res = ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,
00854                                       &seq, flags, timestamp);
00855             if((flags&2) && (seq&0x7F) == 1)
00856                 av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
00857             if (res)
00858                 continue;
00859         }
00860 
00861         if(  (st->discard >= AVDISCARD_NONKEY && !(flags&2))
00862            || st->discard >= AVDISCARD_ALL){
00863             av_free_packet(pkt);
00864         } else
00865             break;
00866     }
00867 
00868     return 0;
00869 }
00870 
00871 static int rm_read_close(AVFormatContext *s)
00872 {
00873     int i;
00874 
00875     for (i=0;i<s->nb_streams;i++)
00876         ff_rm_free_rmstream(s->streams[i]->priv_data);
00877 
00878     return 0;
00879 }
00880 
00881 static int rm_probe(AVProbeData *p)
00882 {
00883     /* check file header */
00884     if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
00885          p->buf[2] == 'M' && p->buf[3] == 'F' &&
00886          p->buf[4] == 0 && p->buf[5] == 0) ||
00887         (p->buf[0] == '.' && p->buf[1] == 'r' &&
00888          p->buf[2] == 'a' && p->buf[3] == 0xfd))
00889         return AVPROBE_SCORE_MAX;
00890     else
00891         return 0;
00892 }
00893 
00894 static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
00895                                int64_t *ppos, int64_t pos_limit)
00896 {
00897     RMDemuxContext *rm = s->priv_data;
00898     int64_t pos, dts;
00899     int stream_index2, flags, len, h;
00900 
00901     pos = *ppos;
00902 
00903     if(rm->old_format)
00904         return AV_NOPTS_VALUE;
00905 
00906     avio_seek(s->pb, pos, SEEK_SET);
00907     rm->remaining_len=0;
00908     for(;;){
00909         int seq=1;
00910         AVStream *st;
00911 
00912         len=sync(s, &dts, &flags, &stream_index2, &pos);
00913         if(len<0)
00914             return AV_NOPTS_VALUE;
00915 
00916         st = s->streams[stream_index2];
00917         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
00918             h= avio_r8(s->pb); len--;
00919             if(!(h & 0x40)){
00920                 seq = avio_r8(s->pb); len--;
00921             }
00922         }
00923 
00924         if((flags&2) && (seq&0x7F) == 1){
00925 //            av_log(s, AV_LOG_DEBUG, "%d %d-%d %"PRId64" %d\n", flags, stream_index2, stream_index, dts, seq);
00926             av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);
00927             if(stream_index2 == stream_index)
00928                 break;
00929         }
00930 
00931         avio_skip(s->pb, len);
00932     }
00933     *ppos = pos;
00934     return dts;
00935 }
00936 
00937 AVInputFormat ff_rm_demuxer = {
00938     "rm",
00939     NULL_IF_CONFIG_SMALL("RealMedia format"),
00940     sizeof(RMDemuxContext),
00941     rm_probe,
00942     rm_read_header,
00943     rm_read_packet,
00944     rm_read_close,
00945     NULL,
00946     rm_read_dts,
00947 };
00948 
00949 AVInputFormat ff_rdt_demuxer = {
00950     "rdt",
00951     NULL_IF_CONFIG_SMALL("RDT demuxer"),
00952     sizeof(RMDemuxContext),
00953     NULL,
00954     NULL,
00955     NULL,
00956     rm_read_close,
00957 };