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             av_log(s, AV_LOG_ERROR,
00355                    "Invalid stream index %d for index at pos %"PRId64"\n",
00356                    str_id, avio_tell(pb));
00357             goto skip;
00358         } else if ((avio_size(pb) - avio_tell(pb)) / 14 < n_pkts) {
00359             av_log(s, AV_LOG_ERROR,
00360                    "Nr. of packets in packet index for stream index %d "
00361                    "exceeds filesize (%"PRId64" at %"PRId64" = %d)\n",
00362                    str_id, avio_size(pb), avio_tell(pb),
00363                    (avio_size(pb) - avio_tell(pb)) / 14);
00364             goto skip;
00365         }
00366 
00367         for (n = 0; n < n_pkts; n++) {
00368             avio_skip(pb, 2);
00369             pts = avio_rb32(pb);
00370             pos = avio_rb32(pb);
00371             avio_skip(pb, 4); /* packet no. */
00372 
00373             av_add_index_entry(st, pos, pts, 0, 0, AVINDEX_KEYFRAME);
00374         }
00375 
00376 skip:
00377         if (next_off && avio_tell(pb) < next_off &&
00378             avio_seek(pb, next_off, SEEK_SET) < 0) {
00379             av_log(s, AV_LOG_ERROR,
00380                    "Non-linear index detected, not supported\n");
00381             return -1;
00382         }
00383     } while (next_off);
00384 
00385     return 0;
00386 }
00387 
00388 static int rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap)
00389 {
00390     RMDemuxContext *rm = s->priv_data;
00391     AVStream *st;
00392 
00393     rm->old_format = 1;
00394     st = av_new_stream(s, 0);
00395     if (!st)
00396         return -1;
00397     st->priv_data = ff_rm_alloc_rmstream();
00398     return rm_read_audio_stream_info(s, s->pb, st, st->priv_data, 1);
00399 }
00400 
00401 static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
00402 {
00403     RMDemuxContext *rm = s->priv_data;
00404     AVStream *st;
00405     AVIOContext *pb = s->pb;
00406     unsigned int tag;
00407     int tag_size;
00408     unsigned int start_time, duration;
00409     unsigned int data_off = 0, indx_off = 0;
00410     char buf[128];
00411     int flags = 0;
00412 
00413     tag = avio_rl32(pb);
00414     if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
00415         /* very old .ra format */
00416         return rm_read_header_old(s, ap);
00417     } else if (tag != MKTAG('.', 'R', 'M', 'F')) {
00418         return AVERROR(EIO);
00419     }
00420 
00421     avio_rb32(pb); /* header size */
00422     avio_rb16(pb);
00423     avio_rb32(pb);
00424     avio_rb32(pb); /* number of headers */
00425 
00426     for(;;) {
00427         if (pb->eof_reached)
00428             return -1;
00429         tag = avio_rl32(pb);
00430         tag_size = avio_rb32(pb);
00431         avio_rb16(pb);
00432         av_dlog(s, "tag=%c%c%c%c (%08x) size=%d\n",
00433                 (tag      ) & 0xff,
00434                 (tag >>  8) & 0xff,
00435                 (tag >> 16) & 0xff,
00436                 (tag >> 24) & 0xff,
00437                 tag,
00438                 tag_size);
00439         if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
00440             return -1;
00441         switch(tag) {
00442         case MKTAG('P', 'R', 'O', 'P'):
00443             /* file header */
00444             avio_rb32(pb); /* max bit rate */
00445             avio_rb32(pb); /* avg bit rate */
00446             avio_rb32(pb); /* max packet size */
00447             avio_rb32(pb); /* avg packet size */
00448             avio_rb32(pb); /* nb packets */
00449             avio_rb32(pb); /* duration */
00450             avio_rb32(pb); /* preroll */
00451             indx_off = avio_rb32(pb); /* index offset */
00452             data_off = avio_rb32(pb); /* data offset */
00453             avio_rb16(pb); /* nb streams */
00454             flags = avio_rb16(pb); /* flags */
00455             break;
00456         case MKTAG('C', 'O', 'N', 'T'):
00457             rm_read_metadata(s, 1);
00458             break;
00459         case MKTAG('M', 'D', 'P', 'R'):
00460             st = av_new_stream(s, 0);
00461             if (!st)
00462                 return AVERROR(ENOMEM);
00463             st->id = avio_rb16(pb);
00464             avio_rb32(pb); /* max bit rate */
00465             st->codec->bit_rate = avio_rb32(pb); /* bit rate */
00466             avio_rb32(pb); /* max packet size */
00467             avio_rb32(pb); /* avg packet size */
00468             start_time = avio_rb32(pb); /* start time */
00469             avio_rb32(pb); /* preroll */
00470             duration = avio_rb32(pb); /* duration */
00471             st->start_time = start_time;
00472             st->duration = duration;
00473             get_str8(pb, buf, sizeof(buf)); /* desc */
00474             get_str8(pb, buf, sizeof(buf)); /* mimetype */
00475             st->codec->codec_type = AVMEDIA_TYPE_DATA;
00476             st->priv_data = ff_rm_alloc_rmstream();
00477             if (ff_rm_read_mdpr_codecdata(s, s->pb, st, st->priv_data,
00478                                           avio_rb32(pb)) < 0)
00479                 return -1;
00480             break;
00481         case MKTAG('D', 'A', 'T', 'A'):
00482             goto header_end;
00483         default:
00484             /* unknown tag: skip it */
00485             avio_skip(pb, tag_size - 10);
00486             break;
00487         }
00488     }
00489  header_end:
00490     rm->nb_packets = avio_rb32(pb); /* number of packets */
00491     if (!rm->nb_packets && (flags & 4))
00492         rm->nb_packets = 3600 * 25;
00493     avio_rb32(pb); /* next data header */
00494 
00495     if (!data_off)
00496         data_off = avio_tell(pb) - 18;
00497     if (indx_off && pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
00498         avio_seek(pb, indx_off, SEEK_SET) >= 0) {
00499         rm_read_index(s);
00500         avio_seek(pb, data_off + 18, SEEK_SET);
00501     }
00502 
00503     return 0;
00504 }
00505 
00506 static int get_num(AVIOContext *pb, int *len)
00507 {
00508     int n, n1;
00509 
00510     n = avio_rb16(pb);
00511     (*len)-=2;
00512     n &= 0x7FFF;
00513     if (n >= 0x4000) {
00514         return n - 0x4000;
00515     } else {
00516         n1 = avio_rb16(pb);
00517         (*len)-=2;
00518         return (n << 16) | n1;
00519     }
00520 }
00521 
00522 /* multiple of 20 bytes for ra144 (ugly) */
00523 #define RAW_PACKET_SIZE 1000
00524 
00525 static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
00526     RMDemuxContext *rm = s->priv_data;
00527     AVIOContext *pb = s->pb;
00528     AVStream *st;
00529     uint32_t state=0xFFFFFFFF;
00530 
00531     while(!pb->eof_reached){
00532         int len, num, i;
00533         *pos= avio_tell(pb) - 3;
00534         if(rm->remaining_len > 0){
00535             num= rm->current_stream;
00536             len= rm->remaining_len;
00537             *timestamp = AV_NOPTS_VALUE;
00538             *flags= 0;
00539         }else{
00540             state= (state<<8) + avio_r8(pb);
00541 
00542             if(state == MKBETAG('I', 'N', 'D', 'X')){
00543                 int n_pkts, expected_len;
00544                 len = avio_rb32(pb);
00545                 avio_skip(pb, 2);
00546                 n_pkts = avio_rb32(pb);
00547                 expected_len = 20 + n_pkts * 14;
00548                 if (len == 20)
00549                     /* some files don't add index entries to chunk size... */
00550                     len = expected_len;
00551                 else if (len != expected_len)
00552                     av_log(s, AV_LOG_WARNING,
00553                            "Index size %d (%d pkts) is wrong, should be %d.\n",
00554                            len, n_pkts, expected_len);
00555                 len -= 14; // we already read part of the index header
00556                 if(len<0)
00557                     continue;
00558                 goto skip;
00559             } else if (state == MKBETAG('D','A','T','A')) {
00560                 av_log(s, AV_LOG_WARNING,
00561                        "DATA tag in middle of chunk, file may be broken.\n");
00562             }
00563 
00564             if(state > (unsigned)0xFFFF || state <= 12)
00565                 continue;
00566             len=state - 12;
00567             state= 0xFFFFFFFF;
00568 
00569             num = avio_rb16(pb);
00570             *timestamp = avio_rb32(pb);
00571             avio_r8(pb); /* reserved */
00572             *flags = avio_r8(pb); /* flags */
00573         }
00574         for(i=0;i<s->nb_streams;i++) {
00575             st = s->streams[i];
00576             if (num == st->id)
00577                 break;
00578         }
00579         if (i == s->nb_streams) {
00580 skip:
00581             /* skip packet if unknown number */
00582             avio_skip(pb, len);
00583             rm->remaining_len = 0;
00584             continue;
00585         }
00586         *stream_index= i;
00587 
00588         return len;
00589     }
00590     return -1;
00591 }
00592 
00593 static int rm_assemble_video_frame(AVFormatContext *s, AVIOContext *pb,
00594                                    RMDemuxContext *rm, RMStream *vst,
00595                                    AVPacket *pkt, int len, int *pseq)
00596 {
00597     int hdr, seq, pic_num, len2, pos;
00598     int type;
00599 
00600     hdr = avio_r8(pb); len--;
00601     type = hdr >> 6;
00602 
00603     if(type != 3){  // not frame as a part of packet
00604         seq = avio_r8(pb); len--;
00605     }
00606     if(type != 1){  // not whole frame
00607         len2 = get_num(pb, &len);
00608         pos  = get_num(pb, &len);
00609         pic_num = avio_r8(pb); len--;
00610     }
00611     if(len<0)
00612         return -1;
00613     rm->remaining_len = len;
00614     if(type&1){     // frame, not slice
00615         if(type == 3)  // frame as a part of packet
00616             len= len2;
00617         if(rm->remaining_len < len)
00618             return -1;
00619         rm->remaining_len -= len;
00620         if(av_new_packet(pkt, len + 9) < 0)
00621             return AVERROR(EIO);
00622         pkt->data[0] = 0;
00623         AV_WL32(pkt->data + 1, 1);
00624         AV_WL32(pkt->data + 5, 0);
00625         avio_read(pb, pkt->data + 9, len);
00626         return 0;
00627     }
00628     //now we have to deal with single slice
00629 
00630     *pseq = seq;
00631     if((seq & 0x7F) == 1 || vst->curpic_num != pic_num){
00632         vst->slices = ((hdr & 0x3F) << 1) + 1;
00633         vst->videobufsize = len2 + 8*vst->slices + 1;
00634         av_free_packet(&vst->pkt); //FIXME this should be output.
00635         if(av_new_packet(&vst->pkt, vst->videobufsize) < 0)
00636             return AVERROR(ENOMEM);
00637         vst->videobufpos = 8*vst->slices + 1;
00638         vst->cur_slice = 0;
00639         vst->curpic_num = pic_num;
00640         vst->pktpos = avio_tell(pb);
00641     }
00642     if(type == 2)
00643         len = FFMIN(len, pos);
00644 
00645     if(++vst->cur_slice > vst->slices)
00646         return 1;
00647     AV_WL32(vst->pkt.data - 7 + 8*vst->cur_slice, 1);
00648     AV_WL32(vst->pkt.data - 3 + 8*vst->cur_slice, vst->videobufpos - 8*vst->slices - 1);
00649     if(vst->videobufpos + len > vst->videobufsize)
00650         return 1;
00651     if (avio_read(pb, vst->pkt.data + vst->videobufpos, len) != len)
00652         return AVERROR(EIO);
00653     vst->videobufpos += len;
00654     rm->remaining_len-= len;
00655 
00656     if(type == 2 || (vst->videobufpos) == vst->videobufsize){
00657         vst->pkt.data[0] = vst->cur_slice-1;
00658         *pkt= vst->pkt;
00659         vst->pkt.data= NULL;
00660         vst->pkt.size= 0;
00661         if(vst->slices != vst->cur_slice) //FIXME find out how to set slices correct from the begin
00662             memmove(pkt->data + 1 + 8*vst->cur_slice, pkt->data + 1 + 8*vst->slices,
00663                 vst->videobufpos - 1 - 8*vst->slices);
00664         pkt->size = vst->videobufpos + 8*(vst->cur_slice - vst->slices);
00665         pkt->pts = AV_NOPTS_VALUE;
00666         pkt->pos = vst->pktpos;
00667         vst->slices = 0;
00668         return 0;
00669     }
00670 
00671     return 1;
00672 }
00673 
00674 static inline void
00675 rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt)
00676 {
00677     uint8_t *ptr;
00678     int j;
00679 
00680     if (st->codec->codec_id == CODEC_ID_AC3) {
00681         ptr = pkt->data;
00682         for (j=0;j<pkt->size;j+=2) {
00683             FFSWAP(int, ptr[0], ptr[1]);
00684             ptr += 2;
00685         }
00686     }
00687 }
00688 
00693 void ff_rm_reorder_sipr_data(uint8_t *buf, int sub_packet_h, int framesize)
00694 {
00695     int n, bs = sub_packet_h * framesize * 2 / 96; // nibbles per subpacket
00696 
00697     for (n = 0; n < 38; n++) {
00698         int j;
00699         int i = bs * sipr_swaps[n][0];
00700         int o = bs * sipr_swaps[n][1];
00701 
00702         /* swap 4bit-nibbles of block 'i' with 'o' */
00703         for (j = 0; j < bs; j++, i++, o++) {
00704             int x = (buf[i >> 1] >> (4 * (i & 1))) & 0xF,
00705                 y = (buf[o >> 1] >> (4 * (o & 1))) & 0xF;
00706 
00707             buf[o >> 1] = (x << (4 * (o & 1))) |
00708                 (buf[o >> 1] & (0xF << (4 * !(o & 1))));
00709             buf[i >> 1] = (y << (4 * (i & 1))) |
00710                 (buf[i >> 1] & (0xF << (4 * !(i & 1))));
00711         }
00712     }
00713 }
00714 
00715 int
00716 ff_rm_parse_packet (AVFormatContext *s, AVIOContext *pb,
00717                     AVStream *st, RMStream *ast, int len, AVPacket *pkt,
00718                     int *seq, int flags, int64_t timestamp)
00719 {
00720     RMDemuxContext *rm = s->priv_data;
00721 
00722     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
00723         rm->current_stream= st->id;
00724         if(rm_assemble_video_frame(s, pb, rm, ast, pkt, len, seq))
00725             return -1; //got partial frame
00726     } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
00727         if ((st->codec->codec_id == CODEC_ID_RA_288) ||
00728             (st->codec->codec_id == CODEC_ID_COOK) ||
00729             (st->codec->codec_id == CODEC_ID_ATRAC3) ||
00730             (st->codec->codec_id == CODEC_ID_SIPR)) {
00731             int x;
00732             int sps = ast->sub_packet_size;
00733             int cfs = ast->coded_framesize;
00734             int h = ast->sub_packet_h;
00735             int y = ast->sub_packet_cnt;
00736             int w = ast->audio_framesize;
00737 
00738             if (flags & 2)
00739                 y = ast->sub_packet_cnt = 0;
00740             if (!y)
00741                 ast->audiotimestamp = timestamp;
00742 
00743             switch(st->codec->codec_id) {
00744                 case CODEC_ID_RA_288:
00745                     for (x = 0; x < h/2; x++)
00746                         avio_read(pb, ast->pkt.data+x*2*w+y*cfs, cfs);
00747                     break;
00748                 case CODEC_ID_ATRAC3:
00749                 case CODEC_ID_COOK:
00750                     for (x = 0; x < w/sps; x++)
00751                         avio_read(pb, ast->pkt.data+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
00752                     break;
00753                 case CODEC_ID_SIPR:
00754                     avio_read(pb, ast->pkt.data + y * w, w);
00755                     break;
00756             }
00757 
00758             if (++(ast->sub_packet_cnt) < h)
00759                 return -1;
00760             if (st->codec->codec_id == CODEC_ID_SIPR)
00761                 ff_rm_reorder_sipr_data(ast->pkt.data, h, w);
00762 
00763              ast->sub_packet_cnt = 0;
00764              rm->audio_stream_num = st->index;
00765              rm->audio_pkt_cnt = h * w / st->codec->block_align;
00766         } else if (st->codec->codec_id == CODEC_ID_AAC) {
00767             int x;
00768             rm->audio_stream_num = st->index;
00769             ast->sub_packet_cnt = (avio_rb16(pb) & 0xf0) >> 4;
00770             if (ast->sub_packet_cnt) {
00771                 for (x = 0; x < ast->sub_packet_cnt; x++)
00772                     ast->sub_packet_lengths[x] = avio_rb16(pb);
00773                 rm->audio_pkt_cnt = ast->sub_packet_cnt;
00774                 ast->audiotimestamp = timestamp;
00775             } else
00776                 return -1;
00777         } else {
00778             av_get_packet(pb, pkt, len);
00779             rm_ac3_swap_bytes(st, pkt);
00780         }
00781     } else
00782         av_get_packet(pb, pkt, len);
00783 
00784     pkt->stream_index = st->index;
00785 
00786 #if 0
00787     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
00788         if(st->codec->codec_id == CODEC_ID_RV20){
00789             int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
00790             av_log(s, AV_LOG_DEBUG, "%d %"PRId64" %d\n", *timestamp, *timestamp*512LL/25, seq);
00791 
00792             seq |= (timestamp&~0x3FFF);
00793             if(seq - timestamp >  0x2000) seq -= 0x4000;
00794             if(seq - timestamp < -0x2000) seq += 0x4000;
00795         }
00796     }
00797 #endif
00798 
00799     pkt->pts= timestamp;
00800     if (flags & 2)
00801         pkt->flags |= AV_PKT_FLAG_KEY;
00802 
00803     return st->codec->codec_type == AVMEDIA_TYPE_AUDIO ? rm->audio_pkt_cnt : 0;
00804 }
00805 
00806 int
00807 ff_rm_retrieve_cache (AVFormatContext *s, AVIOContext *pb,
00808                       AVStream *st, RMStream *ast, AVPacket *pkt)
00809 {
00810     RMDemuxContext *rm = s->priv_data;
00811 
00812     assert (rm->audio_pkt_cnt > 0);
00813 
00814     if (st->codec->codec_id == CODEC_ID_AAC)
00815         av_get_packet(pb, pkt, ast->sub_packet_lengths[ast->sub_packet_cnt - rm->audio_pkt_cnt]);
00816     else {
00817         av_new_packet(pkt, st->codec->block_align);
00818         memcpy(pkt->data, ast->pkt.data + st->codec->block_align * //FIXME avoid this
00819                (ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
00820                st->codec->block_align);
00821     }
00822     rm->audio_pkt_cnt--;
00823     if ((pkt->pts = ast->audiotimestamp) != AV_NOPTS_VALUE) {
00824         ast->audiotimestamp = AV_NOPTS_VALUE;
00825         pkt->flags = AV_PKT_FLAG_KEY;
00826     } else
00827         pkt->flags = 0;
00828     pkt->stream_index = st->index;
00829 
00830     return rm->audio_pkt_cnt;
00831 }
00832 
00833 static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
00834 {
00835     RMDemuxContext *rm = s->priv_data;
00836     AVStream *st;
00837     int i, len, res, seq = 1;
00838     int64_t timestamp, pos;
00839     int flags;
00840 
00841     for (;;) {
00842         if (rm->audio_pkt_cnt) {
00843             // If there are queued audio packet return them first
00844             st = s->streams[rm->audio_stream_num];
00845             ff_rm_retrieve_cache(s, s->pb, st, st->priv_data, pkt);
00846             flags = 0;
00847         } else {
00848             if (rm->old_format) {
00849                 RMStream *ast;
00850 
00851                 st = s->streams[0];
00852                 ast = st->priv_data;
00853                 timestamp = AV_NOPTS_VALUE;
00854                 len = !ast->audio_framesize ? RAW_PACKET_SIZE :
00855                     ast->coded_framesize * ast->sub_packet_h / 2;
00856                 flags = (seq++ == 1) ? 2 : 0;
00857                 pos = avio_tell(s->pb);
00858             } else {
00859                 len=sync(s, &timestamp, &flags, &i, &pos);
00860                 if (len > 0)
00861                     st = s->streams[i];
00862             }
00863 
00864             if(len<0 || s->pb->eof_reached)
00865                 return AVERROR(EIO);
00866 
00867             res = ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,
00868                                       &seq, flags, timestamp);
00869             if((flags&2) && (seq&0x7F) == 1)
00870                 av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
00871             if (res)
00872                 continue;
00873         }
00874 
00875         if(  (st->discard >= AVDISCARD_NONKEY && !(flags&2))
00876            || st->discard >= AVDISCARD_ALL){
00877             av_free_packet(pkt);
00878         } else
00879             break;
00880     }
00881 
00882     return 0;
00883 }
00884 
00885 static int rm_read_close(AVFormatContext *s)
00886 {
00887     int i;
00888 
00889     for (i=0;i<s->nb_streams;i++)
00890         ff_rm_free_rmstream(s->streams[i]->priv_data);
00891 
00892     return 0;
00893 }
00894 
00895 static int rm_probe(AVProbeData *p)
00896 {
00897     /* check file header */
00898     if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
00899          p->buf[2] == 'M' && p->buf[3] == 'F' &&
00900          p->buf[4] == 0 && p->buf[5] == 0) ||
00901         (p->buf[0] == '.' && p->buf[1] == 'r' &&
00902          p->buf[2] == 'a' && p->buf[3] == 0xfd))
00903         return AVPROBE_SCORE_MAX;
00904     else
00905         return 0;
00906 }
00907 
00908 static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
00909                                int64_t *ppos, int64_t pos_limit)
00910 {
00911     RMDemuxContext *rm = s->priv_data;
00912     int64_t pos, dts;
00913     int stream_index2, flags, len, h;
00914 
00915     pos = *ppos;
00916 
00917     if(rm->old_format)
00918         return AV_NOPTS_VALUE;
00919 
00920     avio_seek(s->pb, pos, SEEK_SET);
00921     rm->remaining_len=0;
00922     for(;;){
00923         int seq=1;
00924         AVStream *st;
00925 
00926         len=sync(s, &dts, &flags, &stream_index2, &pos);
00927         if(len<0)
00928             return AV_NOPTS_VALUE;
00929 
00930         st = s->streams[stream_index2];
00931         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
00932             h= avio_r8(s->pb); len--;
00933             if(!(h & 0x40)){
00934                 seq = avio_r8(s->pb); len--;
00935             }
00936         }
00937 
00938         if((flags&2) && (seq&0x7F) == 1){
00939 //            av_log(s, AV_LOG_DEBUG, "%d %d-%d %"PRId64" %d\n", flags, stream_index2, stream_index, dts, seq);
00940             av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);
00941             if(stream_index2 == stream_index)
00942                 break;
00943         }
00944 
00945         avio_skip(s->pb, len);
00946     }
00947     *ppos = pos;
00948     return dts;
00949 }
00950 
00951 AVInputFormat ff_rm_demuxer = {
00952     "rm",
00953     NULL_IF_CONFIG_SMALL("RealMedia format"),
00954     sizeof(RMDemuxContext),
00955     rm_probe,
00956     rm_read_header,
00957     rm_read_packet,
00958     rm_read_close,
00959     NULL,
00960     rm_read_dts,
00961 };
00962 
00963 AVInputFormat ff_rdt_demuxer = {
00964     "rdt",
00965     NULL_IF_CONFIG_SMALL("RDT demuxer"),
00966     sizeof(RMDemuxContext),
00967     NULL,
00968     NULL,
00969     NULL,
00970     rm_read_close,
00971 };