FFmpeg: libavformat/rmdec.c Source File

00001 /*
00002  * "Real" compatible demuxer.
00003  * Copyright (c) 2000, 2001 Fabrice Bellard
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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 "avformat.h"
00025 #include "riff.h"
00026 #include "rm.h"
00027 
00028 struct RMStream {
00029     AVPacket pkt;      
00030     int videobufsize;  
00031     int videobufpos;   
00032     int curpic_num;    
00033     int cur_slice, slices;
00034     int64_t pktpos;    
00035 
00036     int64_t audiotimestamp; 
00037     int sub_packet_cnt; // Subpacket counter, used while reading
00038     int sub_packet_size, sub_packet_h, coded_framesize; 
00039     int audio_framesize; 
00040     int sub_packet_lengths[16]; 
00041 };
00042 
00043 typedef struct {
00044     int nb_packets;
00045     int old_format;
00046     int current_stream;
00047     int remaining_len;
00048     int audio_stream_num; 
00049     int audio_pkt_cnt; 
00050 } RMDemuxContext;
00051 
00052 static const AVCodecTag rm_codec_tags[] = {
00053     { CODEC_ID_RV10,   MKTAG('R','V','1','0') },
00054     { CODEC_ID_RV20,   MKTAG('R','V','2','0') },
00055     { CODEC_ID_RV20,   MKTAG('R','V','T','R') },
00056     { CODEC_ID_RV30,   MKTAG('R','V','3','0') },
00057     { CODEC_ID_RV40,   MKTAG('R','V','4','0') },
00058     { CODEC_ID_AC3,    MKTAG('d','n','e','t') },
00059     { CODEC_ID_RA_144, MKTAG('l','p','c','J') },
00060     { CODEC_ID_RA_288, MKTAG('2','8','_','8') },
00061     { CODEC_ID_COOK,   MKTAG('c','o','o','k') },
00062     { CODEC_ID_ATRAC3, MKTAG('a','t','r','c') },
00063     { CODEC_ID_SIPR,   MKTAG('s','i','p','r') },
00064     { CODEC_ID_AAC,    MKTAG('r','a','a','c') },
00065     { CODEC_ID_AAC,    MKTAG('r','a','c','p') },
00066     { CODEC_ID_NONE },
00067 };
00068 
00069 static const unsigned char sipr_swaps[38][2] = {
00070     {  0, 63 }, {  1, 22 }, {  2, 44 }, {  3, 90 },
00071     {  5, 81 }, {  7, 31 }, {  8, 86 }, {  9, 58 },
00072     { 10, 36 }, { 12, 68 }, { 13, 39 }, { 14, 73 },
00073     { 15, 53 }, { 16, 69 }, { 17, 57 }, { 19, 88 },
00074     { 20, 34 }, { 21, 71 }, { 24, 46 }, { 25, 94 },
00075     { 26, 54 }, { 28, 75 }, { 29, 50 }, { 32, 70 },
00076     { 33, 92 }, { 35, 74 }, { 38, 85 }, { 40, 56 },
00077     { 42, 87 }, { 43, 65 }, { 45, 59 }, { 48, 79 },
00078     { 49, 93 }, { 51, 89 }, { 55, 95 }, { 61, 76 },
00079     { 67, 83 }, { 77, 80 }
00080 };
00081 
00082 const unsigned char ff_sipr_subpk_size[4] = { 29, 19, 37, 20 };
00083 
00084 static inline void get_strl(ByteIOContext *pb, char *buf, int buf_size, int len)
00085 {
00086     int i;
00087     char *q, r;
00088 
00089     q = buf;
00090     for(i=0;i<len;i++) {
00091         r = get_byte(pb);
00092         if (i < buf_size - 1)
00093             *q++ = r;
00094     }
00095     if (buf_size > 0) *q = '\0';
00096 }
00097 
00098 static void get_str8(ByteIOContext *pb, char *buf, int buf_size)
00099 {
00100     get_strl(pb, buf, buf_size, get_byte(pb));
00101 }
00102 
00103 static int rm_read_extradata(ByteIOContext *pb, AVCodecContext *avctx, unsigned size)
00104 {
00105     if (size >= 1<<24)
00106         return -1;
00107     avctx->extradata = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
00108     if (!avctx->extradata)
00109         return AVERROR(ENOMEM);
00110     avctx->extradata_size = get_buffer(pb, avctx->extradata, size);
00111     memset(avctx->extradata + avctx->extradata_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
00112     if (avctx->extradata_size != size)
00113         return AVERROR(EIO);
00114     return 0;
00115 }
00116 
00117 static void rm_read_metadata(AVFormatContext *s, int wide)
00118 {
00119     char buf[1024];
00120     int i;
00121     for (i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
00122         int len = wide ? get_be16(s->pb) : get_byte(s->pb);
00123         get_strl(s->pb, buf, sizeof(buf), len);
00124         av_metadata_set2(&s->metadata, ff_rm_metadata[i], buf, 0);
00125     }
00126 }
00127 
00128 RMStream *ff_rm_alloc_rmstream (void)
00129 {
00130     RMStream *rms = av_mallocz(sizeof(RMStream));
00131     rms->curpic_num = -1;
00132     return rms;
00133 }
00134 
00135 void ff_rm_free_rmstream (RMStream *rms)
00136 {
00137     av_free_packet(&rms->pkt);
00138 }
00139 
00140 static int rm_read_audio_stream_info(AVFormatContext *s, ByteIOContext *pb,
00141                                      AVStream *st, RMStream *ast, int read_all)
00142 {
00143     char buf[256];
00144     uint32_t version;
00145     int ret;
00146 
00147     /* ra type header */
00148     version = get_be16(pb); /* version */
00149     if (version == 3) {
00150         int header_size = get_be16(pb);
00151         int64_t startpos = url_ftell(pb);
00152         url_fskip(pb, 14);
00153         rm_read_metadata(s, 0);
00154         if ((startpos + header_size) >= url_ftell(pb) + 2) {
00155             // fourcc (should always be "lpcJ")
00156             get_byte(pb);
00157             get_str8(pb, buf, sizeof(buf));
00158         }
00159         // Skip extra header crap (this should never happen)
00160         if ((startpos + header_size) > url_ftell(pb))
00161             url_fskip(pb, header_size + startpos - url_ftell(pb));
00162         st->codec->sample_rate = 8000;
00163         st->codec->channels = 1;
00164         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00165         st->codec->codec_id = CODEC_ID_RA_144;
00166     } else {
00167         int flavor, sub_packet_h, coded_framesize, sub_packet_size;
00168         int codecdata_length;
00169         /* old version (4) */
00170         url_fskip(pb, 2); /* unused */
00171         get_be32(pb); /* .ra4 */
00172         get_be32(pb); /* data size */
00173         get_be16(pb); /* version2 */
00174         get_be32(pb); /* header size */
00175         flavor= get_be16(pb); /* add codec info / flavor */
00176         ast->coded_framesize = coded_framesize = get_be32(pb); /* coded frame size */
00177         get_be32(pb); /* ??? */
00178         get_be32(pb); /* ??? */
00179         get_be32(pb); /* ??? */
00180         ast->sub_packet_h = sub_packet_h = get_be16(pb); /* 1 */
00181         st->codec->block_align= get_be16(pb); /* frame size */
00182         ast->sub_packet_size = sub_packet_size = get_be16(pb); /* sub packet size */
00183         get_be16(pb); /* ??? */
00184         if (version == 5) {
00185             get_be16(pb); get_be16(pb); get_be16(pb);
00186         }
00187         st->codec->sample_rate = get_be16(pb);
00188         get_be32(pb);
00189         st->codec->channels = get_be16(pb);
00190         if (version == 5) {
00191             get_be32(pb);
00192             get_buffer(pb, buf, 4);
00193             buf[4] = 0;
00194         } else {
00195             get_str8(pb, buf, sizeof(buf)); /* desc */
00196             get_str8(pb, buf, sizeof(buf)); /* desc */
00197         }
00198         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00199         st->codec->codec_tag  = AV_RL32(buf);
00200         st->codec->codec_id   = ff_codec_get_id(rm_codec_tags, st->codec->codec_tag);
00201         switch (st->codec->codec_id) {
00202         case CODEC_ID_AC3:
00203             st->need_parsing = AVSTREAM_PARSE_FULL;
00204             break;
00205         case CODEC_ID_RA_288:
00206             st->codec->extradata_size= 0;
00207             ast->audio_framesize = st->codec->block_align;
00208             st->codec->block_align = coded_framesize;
00209 
00210             if(ast->audio_framesize >= UINT_MAX / sub_packet_h){
00211                 av_log(s, AV_LOG_ERROR, "ast->audio_framesize * sub_packet_h too large\n");
00212                 return -1;
00213             }
00214 
00215             av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h);
00216             break;
00217         case CODEC_ID_COOK:
00218         case CODEC_ID_ATRAC3:
00219         case CODEC_ID_SIPR:
00220             get_be16(pb); get_byte(pb);
00221             if (version == 5)
00222                 get_byte(pb);
00223             codecdata_length = get_be32(pb);
00224             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
00225                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
00226                 return -1;
00227             }
00228 
00229             if (!strcmp(buf, "cook")) st->codec->codec_id = CODEC_ID_COOK;
00230             else if (!strcmp(buf, "sipr")) st->codec->codec_id = CODEC_ID_SIPR;
00231             else st->codec->codec_id = CODEC_ID_ATRAC3;
00232 
00233             ast->audio_framesize = st->codec->block_align;
00234             if (st->codec->codec_id == CODEC_ID_SIPR) {
00235                 if (flavor > 3) {
00236                     av_log(s, AV_LOG_ERROR, "bad SIPR file flavor %d\n",
00237                            flavor);
00238                     return -1;
00239                 }
00240                 st->codec->block_align = ff_sipr_subpk_size[flavor];
00241             } else {
00242                 if(sub_packet_size <= 0){
00243                     av_log(s, AV_LOG_ERROR, "sub_packet_size is invalid\n");
00244                     return -1;
00245                 }
00246                 st->codec->block_align = ast->sub_packet_size;
00247             }
00248             if ((ret = rm_read_extradata(pb, st->codec, codecdata_length)) < 0)
00249                 return ret;
00250 
00251             if(ast->audio_framesize >= UINT_MAX / sub_packet_h){
00252                 av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
00253                 return -1;
00254             }
00255 
00256             av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h);
00257             break;
00258         case CODEC_ID_AAC:
00259             get_be16(pb); get_byte(pb);
00260             if (version == 5)
00261                 get_byte(pb);
00262             st->codec->codec_id = CODEC_ID_AAC;
00263             codecdata_length = get_be32(pb);
00264             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
00265                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
00266                 return -1;
00267             }
00268             if (codecdata_length >= 1) {
00269                 get_byte(pb);
00270                 if ((ret = rm_read_extradata(pb, st->codec, codecdata_length - 1)) < 0)
00271                     return ret;
00272             }
00273             break;
00274         default:
00275             av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));
00276         }
00277         if (read_all) {
00278             get_byte(pb);
00279             get_byte(pb);
00280             get_byte(pb);
00281             rm_read_metadata(s, 0);
00282         }
00283     }
00284     return 0;
00285 }
00286 
00287 int
00288 ff_rm_read_mdpr_codecdata (AVFormatContext *s, ByteIOContext *pb,
00289                            AVStream *st, RMStream *rst, int codec_data_size)
00290 {
00291     unsigned int v;
00292     int size;
00293     int64_t codec_pos;
00294     int ret;
00295 
00296     av_set_pts_info(st, 64, 1, 1000);
00297     codec_pos = url_ftell(pb);
00298     v = get_be32(pb);
00299     if (v == MKTAG(0xfd, 'a', 'r', '.')) {
00300         /* ra type header */
00301         if (rm_read_audio_stream_info(s, pb, st, rst, 0))
00302             return -1;
00303     } else {
00304         int fps, fps2;
00305         if (get_le32(pb) != MKTAG('V', 'I', 'D', 'O')) {
00306         fail1:
00307             av_log(st->codec, AV_LOG_ERROR, "Unsupported video codec\n");
00308             goto skip;
00309         }
00310         st->codec->codec_tag = get_le32(pb);
00311         st->codec->codec_id  = ff_codec_get_id(rm_codec_tags, st->codec->codec_tag);
00312 //        av_log(s, AV_LOG_DEBUG, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));
00313         if (st->codec->codec_id == CODEC_ID_NONE)
00314             goto fail1;
00315         st->codec->width = get_be16(pb);
00316         st->codec->height = get_be16(pb);
00317         st->codec->time_base.num= 1;
00318         fps= get_be16(pb);
00319         st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00320         get_be32(pb);
00321         fps2= get_be16(pb);
00322         get_be16(pb);
00323 
00324         if ((ret = rm_read_extradata(pb, st->codec, codec_data_size - (url_ftell(pb) - codec_pos))) < 0)
00325             return ret;
00326 
00327 //        av_log(s, AV_LOG_DEBUG, "fps= %d fps2= %d\n", fps, fps2);
00328         st->codec->time_base.den = fps * st->codec->time_base.num;
00329         //XXX: do we really need that?
00330         switch(st->codec->extradata[4]>>4){
00331         case 1: st->codec->codec_id = CODEC_ID_RV10; break;
00332         case 2: st->codec->codec_id = CODEC_ID_RV20; break;
00333         case 3: st->codec->codec_id = CODEC_ID_RV30; break;
00334         case 4: st->codec->codec_id = CODEC_ID_RV40; break;
00335         default:
00336             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]);
00337             goto fail1;
00338         }
00339     }
00340 
00341 skip:
00342     /* skip codec info */
00343     size = url_ftell(pb) - codec_pos;
00344     url_fskip(pb, codec_data_size - size);
00345 
00346     return 0;
00347 }
00348 
00351 static int rm_read_index(AVFormatContext *s)
00352 {
00353     ByteIOContext *pb = s->pb;
00354     unsigned int size, n_pkts, str_id, next_off, n, pos, pts;
00355     AVStream *st;
00356 
00357     do {
00358         if (get_le32(pb) != MKTAG('I','N','D','X'))
00359             return -1;
00360         size     = get_be32(pb);
00361         if (size < 20)
00362             return -1;
00363         url_fskip(pb, 2);
00364         n_pkts   = get_be32(pb);
00365         str_id   = get_be16(pb);
00366         next_off = get_be32(pb);
00367         for (n = 0; n < s->nb_streams; n++)
00368             if (s->streams[n]->id == str_id) {
00369                 st = s->streams[n];
00370                 break;
00371             }
00372         if (n == s->nb_streams)
00373             goto skip;
00374 
00375         for (n = 0; n < n_pkts; n++) {
00376             url_fskip(pb, 2);
00377             pts = get_be32(pb);
00378             pos = get_be32(pb);
00379             url_fskip(pb, 4); /* packet no. */
00380 
00381             av_add_index_entry(st, pos, pts, 0, 0, AVINDEX_KEYFRAME);
00382         }
00383 
00384 skip:
00385         if (next_off && url_ftell(pb) != next_off &&
00386             url_fseek(pb, next_off, SEEK_SET) < 0)
00387             return -1;
00388     } while (next_off);
00389 
00390     return 0;
00391 }
00392 
00393 static int rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap)
00394 {
00395     RMDemuxContext *rm = s->priv_data;
00396     AVStream *st;
00397 
00398     rm->old_format = 1;
00399     st = av_new_stream(s, 0);
00400     if (!st)
00401         return -1;
00402     st->priv_data = ff_rm_alloc_rmstream();
00403     return rm_read_audio_stream_info(s, s->pb, st, st->priv_data, 1);
00404 }
00405 
00406 static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
00407 {
00408     RMDemuxContext *rm = s->priv_data;
00409     AVStream *st;
00410     ByteIOContext *pb = s->pb;
00411     unsigned int tag;
00412     int tag_size;
00413     unsigned int start_time, duration;
00414     unsigned int data_off = 0, indx_off = 0;
00415     char buf[128];
00416     int flags = 0;
00417 
00418     tag = get_le32(pb);
00419     if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
00420         /* very old .ra format */
00421         return rm_read_header_old(s, ap);
00422     } else if (tag != MKTAG('.', 'R', 'M', 'F')) {
00423         return AVERROR(EIO);
00424     }
00425 
00426     get_be32(pb); /* header size */
00427     get_be16(pb);
00428     get_be32(pb);
00429     get_be32(pb); /* number of headers */
00430 
00431     for(;;) {
00432         if (url_feof(pb))
00433             return -1;
00434         tag = get_le32(pb);
00435         tag_size = get_be32(pb);
00436         get_be16(pb);
00437 #if 0
00438         printf("tag=%c%c%c%c (%08x) size=%d\n",
00439                (tag) & 0xff,
00440                (tag >> 8) & 0xff,
00441                (tag >> 16) & 0xff,
00442                (tag >> 24) & 0xff,
00443                tag,
00444                tag_size);
00445 #endif
00446         if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
00447             return -1;
00448         switch(tag) {
00449         case MKTAG('P', 'R', 'O', 'P'):
00450             /* file header */
00451             get_be32(pb); /* max bit rate */
00452             get_be32(pb); /* avg bit rate */
00453             get_be32(pb); /* max packet size */
00454             get_be32(pb); /* avg packet size */
00455             get_be32(pb); /* nb packets */
00456             get_be32(pb); /* duration */
00457             get_be32(pb); /* preroll */
00458             indx_off = get_be32(pb); /* index offset */
00459             data_off = get_be32(pb); /* data offset */
00460             get_be16(pb); /* nb streams */
00461             flags = get_be16(pb); /* flags */
00462             break;
00463         case MKTAG('C', 'O', 'N', 'T'):
00464             rm_read_metadata(s, 1);
00465             break;
00466         case MKTAG('M', 'D', 'P', 'R'):
00467             st = av_new_stream(s, 0);
00468             if (!st)
00469                 return AVERROR(ENOMEM);
00470             st->id = get_be16(pb);
00471             get_be32(pb); /* max bit rate */
00472             st->codec->bit_rate = get_be32(pb); /* bit rate */
00473             get_be32(pb); /* max packet size */
00474             get_be32(pb); /* avg packet size */
00475             start_time = get_be32(pb); /* start time */
00476             get_be32(pb); /* preroll */
00477             duration = get_be32(pb); /* duration */
00478             st->start_time = start_time;
00479             st->duration = duration;
00480             get_str8(pb, buf, sizeof(buf)); /* desc */
00481             get_str8(pb, buf, sizeof(buf)); /* mimetype */
00482             st->codec->codec_type = AVMEDIA_TYPE_DATA;
00483             st->priv_data = ff_rm_alloc_rmstream();
00484             if (ff_rm_read_mdpr_codecdata(s, s->pb, st, st->priv_data,
00485                                           get_be32(pb)) < 0)
00486                 return -1;
00487             break;
00488         case MKTAG('D', 'A', 'T', 'A'):
00489             goto header_end;
00490         default:
00491             /* unknown tag: skip it */
00492             url_fskip(pb, tag_size - 10);
00493             break;
00494         }
00495     }
00496  header_end:
00497     rm->nb_packets = get_be32(pb); /* number of packets */
00498     if (!rm->nb_packets && (flags & 4))
00499         rm->nb_packets = 3600 * 25;
00500     get_be32(pb); /* next data header */
00501 
00502     if (!data_off)
00503         data_off = url_ftell(pb) - 18;
00504     if (indx_off && url_fseek(pb, indx_off, SEEK_SET) >= 0) {
00505         rm_read_index(s);
00506         url_fseek(pb, data_off + 18, SEEK_SET);
00507     }
00508 
00509     return 0;
00510 }
00511 
00512 static int get_num(ByteIOContext *pb, int *len)
00513 {
00514     int n, n1;
00515 
00516     n = get_be16(pb);
00517     (*len)-=2;
00518     n &= 0x7FFF;
00519     if (n >= 0x4000) {
00520         return n - 0x4000;
00521     } else {
00522         n1 = get_be16(pb);
00523         (*len)-=2;
00524         return (n << 16) | n1;
00525     }
00526 }
00527 
00528 /* multiple of 20 bytes for ra144 (ugly) */
00529 #define RAW_PACKET_SIZE 1000
00530 
00531 static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
00532     RMDemuxContext *rm = s->priv_data;
00533     ByteIOContext *pb = s->pb;
00534     AVStream *st;
00535     uint32_t state=0xFFFFFFFF;
00536 
00537     while(!url_feof(pb)){
00538         int len, num, i;
00539         *pos= url_ftell(pb) - 3;
00540         if(rm->remaining_len > 0){
00541             num= rm->current_stream;
00542             len= rm->remaining_len;
00543             *timestamp = AV_NOPTS_VALUE;
00544             *flags= 0;
00545         }else{
00546             state= (state<<8) + get_byte(pb);
00547 
00548             if(state == MKBETAG('I', 'N', 'D', 'X')){
00549                 int n_pkts, expected_len;
00550                 len = get_be32(pb);
00551                 url_fskip(pb, 2);
00552                 n_pkts = get_be32(pb);
00553                 expected_len = 20 + n_pkts * 14;
00554                 if (len == 20)
00555                     /* some files don't add index entries to chunk size... */
00556                     len = expected_len;
00557                 else if (len != expected_len)
00558                     av_log(s, AV_LOG_WARNING,
00559                            "Index size %d (%d pkts) is wrong, should be %d.\n",
00560                            len, n_pkts, expected_len);
00561                 len -= 14; // we already read part of the index header
00562                 if(len<0)
00563                     continue;
00564                 goto skip;
00565             } else if (state == MKBETAG('D','A','T','A')) {
00566                 av_log(s, AV_LOG_WARNING,
00567                        "DATA tag in middle of chunk, file may be broken.\n");
00568             }
00569 
00570             if(state > (unsigned)0xFFFF || state <= 12)
00571                 continue;
00572             len=state - 12;
00573             state= 0xFFFFFFFF;
00574 
00575             num = get_be16(pb);
00576             *timestamp = get_be32(pb);
00577             get_byte(pb); /* reserved */
00578             *flags = get_byte(pb); /* flags */
00579         }
00580         for(i=0;i<s->nb_streams;i++) {
00581             st = s->streams[i];
00582             if (num == st->id)
00583                 break;
00584         }
00585         if (i == s->nb_streams) {
00586 skip:
00587             /* skip packet if unknown number */
00588             url_fskip(pb, len);
00589             rm->remaining_len = 0;
00590             continue;
00591         }
00592         *stream_index= i;
00593 
00594         return len;
00595     }
00596     return -1;
00597 }
00598 
00599 static int rm_assemble_video_frame(AVFormatContext *s, ByteIOContext *pb,
00600                                    RMDemuxContext *rm, RMStream *vst,
00601                                    AVPacket *pkt, int len, int *pseq)
00602 {
00603     int hdr, seq, pic_num, len2, pos;
00604     int type;
00605 
00606     hdr = get_byte(pb); len--;
00607     type = hdr >> 6;
00608 
00609     if(type != 3){  // not frame as a part of packet
00610         seq = get_byte(pb); len--;
00611     }
00612     if(type != 1){  // not whole frame
00613         len2 = get_num(pb, &len);
00614         pos  = get_num(pb, &len);
00615         pic_num = get_byte(pb); len--;
00616     }
00617     if(len<0)
00618         return -1;
00619     rm->remaining_len = len;
00620     if(type&1){     // frame, not slice
00621         if(type == 3)  // frame as a part of packet
00622             len= len2;
00623         if(rm->remaining_len < len)
00624             return -1;
00625         rm->remaining_len -= len;
00626         if(av_new_packet(pkt, len + 9) < 0)
00627             return AVERROR(EIO);
00628         pkt->data[0] = 0;
00629         AV_WL32(pkt->data + 1, 1);
00630         AV_WL32(pkt->data + 5, 0);
00631         get_buffer(pb, pkt->data + 9, len);
00632         return 0;
00633     }
00634     //now we have to deal with single slice
00635 
00636     *pseq = seq;
00637     if((seq & 0x7F) == 1 || vst->curpic_num != pic_num){
00638         vst->slices = ((hdr & 0x3F) << 1) + 1;
00639         vst->videobufsize = len2 + 8*vst->slices + 1;
00640         av_free_packet(&vst->pkt); //FIXME this should be output.
00641         if(av_new_packet(&vst->pkt, vst->videobufsize) < 0)
00642             return AVERROR(ENOMEM);
00643         vst->videobufpos = 8*vst->slices + 1;
00644         vst->cur_slice = 0;
00645         vst->curpic_num = pic_num;
00646         vst->pktpos = url_ftell(pb);
00647     }
00648     if(type == 2)
00649         len = FFMIN(len, pos);
00650 
00651     if(++vst->cur_slice > vst->slices)
00652         return 1;
00653     AV_WL32(vst->pkt.data - 7 + 8*vst->cur_slice, 1);
00654     AV_WL32(vst->pkt.data - 3 + 8*vst->cur_slice, vst->videobufpos - 8*vst->slices - 1);
00655     if(vst->videobufpos + len > vst->videobufsize)
00656         return 1;
00657     if (get_buffer(pb, vst->pkt.data + vst->videobufpos, len) != len)
00658         return AVERROR(EIO);
00659     vst->videobufpos += len;
00660     rm->remaining_len-= len;
00661 
00662     if(type == 2 || (vst->videobufpos) == vst->videobufsize){
00663         vst->pkt.data[0] = vst->cur_slice-1;
00664         *pkt= vst->pkt;
00665         vst->pkt.data= NULL;
00666         vst->pkt.size= 0;
00667         if(vst->slices != vst->cur_slice) //FIXME find out how to set slices correct from the begin
00668             memmove(pkt->data + 1 + 8*vst->cur_slice, pkt->data + 1 + 8*vst->slices,
00669                 vst->videobufpos - 1 - 8*vst->slices);
00670         pkt->size = vst->videobufpos + 8*(vst->cur_slice - vst->slices);
00671         pkt->pts = AV_NOPTS_VALUE;
00672         pkt->pos = vst->pktpos;
00673         vst->slices = 0;
00674         return 0;
00675     }
00676 
00677     return 1;
00678 }
00679 
00680 static inline void
00681 rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt)
00682 {
00683     uint8_t *ptr;
00684     int j;
00685 
00686     if (st->codec->codec_id == CODEC_ID_AC3) {
00687         ptr = pkt->data;
00688         for (j=0;j<pkt->size;j+=2) {
00689             FFSWAP(int, ptr[0], ptr[1]);
00690             ptr += 2;
00691         }
00692     }
00693 }
00694 
00699 void ff_rm_reorder_sipr_data(uint8_t *buf, int sub_packet_h, int framesize)
00700 {
00701     int n, bs = sub_packet_h * framesize * 2 / 96; // nibbles per subpacket
00702 
00703     for (n = 0; n < 38; n++) {
00704         int j;
00705         int i = bs * sipr_swaps[n][0];
00706         int o = bs * sipr_swaps[n][1];
00707 
00708         /* swap 4bit-nibbles of block 'i' with 'o' */
00709         for (j = 0; j < bs; j++, i++, o++) {
00710             int x = (buf[i >> 1] >> (4 * (i & 1))) & 0xF,
00711                 y = (buf[o >> 1] >> (4 * (o & 1))) & 0xF;
00712 
00713             buf[o >> 1] = (x << (4 * (o & 1))) |
00714                 (buf[o >> 1] & (0xF << (4 * !(o & 1))));
00715             buf[i >> 1] = (y << (4 * (i & 1))) |
00716                 (buf[i >> 1] & (0xF << (4 * !(i & 1))));
00717         }
00718     }
00719 }
00720 
00721 int
00722 ff_rm_parse_packet (AVFormatContext *s, ByteIOContext *pb,
00723                     AVStream *st, RMStream *ast, int len, AVPacket *pkt,
00724                     int *seq, int flags, int64_t timestamp)
00725 {
00726     RMDemuxContext *rm = s->priv_data;
00727 
00728     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
00729         rm->current_stream= st->id;
00730         if(rm_assemble_video_frame(s, pb, rm, ast, pkt, len, seq))
00731             return -1; //got partial frame
00732     } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
00733         if ((st->codec->codec_id == CODEC_ID_RA_288) ||
00734             (st->codec->codec_id == CODEC_ID_COOK) ||
00735             (st->codec->codec_id == CODEC_ID_ATRAC3) ||
00736             (st->codec->codec_id == CODEC_ID_SIPR)) {
00737             int x;
00738             int sps = ast->sub_packet_size;
00739             int cfs = ast->coded_framesize;
00740             int h = ast->sub_packet_h;
00741             int y = ast->sub_packet_cnt;
00742             int w = ast->audio_framesize;
00743 
00744             if (flags & 2)
00745                 y = ast->sub_packet_cnt = 0;
00746             if (!y)
00747                 ast->audiotimestamp = timestamp;
00748 
00749             switch(st->codec->codec_id) {
00750                 case CODEC_ID_RA_288:
00751                     for (x = 0; x < h/2; x++)
00752                         get_buffer(pb, ast->pkt.data+x*2*w+y*cfs, cfs);
00753                     break;
00754                 case CODEC_ID_ATRAC3:
00755                 case CODEC_ID_COOK:
00756                     for (x = 0; x < w/sps; x++)
00757                         get_buffer(pb, ast->pkt.data+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
00758                     break;
00759                 case CODEC_ID_SIPR:
00760                     get_buffer(pb, ast->pkt.data + y * w, w);
00761                     break;
00762             }
00763 
00764             if (++(ast->sub_packet_cnt) < h)
00765                 return -1;
00766             if (st->codec->codec_id == CODEC_ID_SIPR)
00767                 ff_rm_reorder_sipr_data(ast->pkt.data, h, w);
00768 
00769              ast->sub_packet_cnt = 0;
00770              rm->audio_stream_num = st->index;
00771              rm->audio_pkt_cnt = h * w / st->codec->block_align;
00772         } else if (st->codec->codec_id == CODEC_ID_AAC) {
00773             int x;
00774             rm->audio_stream_num = st->index;
00775             ast->sub_packet_cnt = (get_be16(pb) & 0xf0) >> 4;
00776             if (ast->sub_packet_cnt) {
00777                 for (x = 0; x < ast->sub_packet_cnt; x++)
00778                     ast->sub_packet_lengths[x] = get_be16(pb);
00779                 rm->audio_pkt_cnt = ast->sub_packet_cnt;
00780                 ast->audiotimestamp = timestamp;
00781             } else
00782                 return -1;
00783         } else {
00784             av_get_packet(pb, pkt, len);
00785             rm_ac3_swap_bytes(st, pkt);
00786         }
00787     } else
00788         av_get_packet(pb, pkt, len);
00789 
00790     pkt->stream_index = st->index;
00791 
00792 #if 0
00793     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
00794         if(st->codec->codec_id == CODEC_ID_RV20){
00795             int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
00796             av_log(s, AV_LOG_DEBUG, "%d %"PRId64" %d\n", *timestamp, *timestamp*512LL/25, seq);
00797 
00798             seq |= (timestamp&~0x3FFF);
00799             if(seq - timestamp >  0x2000) seq -= 0x4000;
00800             if(seq - timestamp < -0x2000) seq += 0x4000;
00801         }
00802     }
00803 #endif
00804 
00805     pkt->pts= timestamp;
00806     if (flags & 2)
00807         pkt->flags |= AV_PKT_FLAG_KEY;
00808 
00809     return st->codec->codec_type == AVMEDIA_TYPE_AUDIO ? rm->audio_pkt_cnt : 0;
00810 }
00811 
00812 int
00813 ff_rm_retrieve_cache (AVFormatContext *s, ByteIOContext *pb,
00814                       AVStream *st, RMStream *ast, AVPacket *pkt)
00815 {
00816     RMDemuxContext *rm = s->priv_data;
00817 
00818     assert (rm->audio_pkt_cnt > 0);
00819 
00820     if (st->codec->codec_id == CODEC_ID_AAC)
00821         av_get_packet(pb, pkt, ast->sub_packet_lengths[ast->sub_packet_cnt - rm->audio_pkt_cnt]);
00822     else {
00823         av_new_packet(pkt, st->codec->block_align);
00824         memcpy(pkt->data, ast->pkt.data + st->codec->block_align * //FIXME avoid this
00825                (ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
00826                st->codec->block_align);
00827     }
00828     rm->audio_pkt_cnt--;
00829     if ((pkt->pts = ast->audiotimestamp) != AV_NOPTS_VALUE) {
00830         ast->audiotimestamp = AV_NOPTS_VALUE;
00831         pkt->flags = AV_PKT_FLAG_KEY;
00832     } else
00833         pkt->flags = 0;
00834     pkt->stream_index = st->index;
00835 
00836     return rm->audio_pkt_cnt;
00837 }
00838 
00839 static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
00840 {
00841     RMDemuxContext *rm = s->priv_data;
00842     AVStream *st;
00843     int i, len, res, seq = 1;
00844     int64_t timestamp, pos;
00845     int flags;
00846 
00847     for (;;) {
00848         if (rm->audio_pkt_cnt) {
00849             // If there are queued audio packet return them first
00850             st = s->streams[rm->audio_stream_num];
00851             ff_rm_retrieve_cache(s, s->pb, st, st->priv_data, pkt);
00852             flags = 0;
00853         } else {
00854             if (rm->old_format) {
00855                 RMStream *ast;
00856 
00857                 st = s->streams[0];
00858                 ast = st->priv_data;
00859                 timestamp = AV_NOPTS_VALUE;
00860                 len = !ast->audio_framesize ? RAW_PACKET_SIZE :
00861                     ast->coded_framesize * ast->sub_packet_h / 2;
00862                 flags = (seq++ == 1) ? 2 : 0;
00863                 pos = url_ftell(s->pb);
00864             } else {
00865                 len=sync(s, &timestamp, &flags, &i, &pos);
00866                 if (len > 0)
00867                     st = s->streams[i];
00868             }
00869 
00870             if(len<0 || url_feof(s->pb))
00871                 return AVERROR(EIO);
00872 
00873             res = ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,
00874                                       &seq, flags, timestamp);
00875             if((flags&2) && (seq&0x7F) == 1)
00876                 av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
00877             if (res)
00878                 continue;
00879         }
00880 
00881         if(  (st->discard >= AVDISCARD_NONKEY && !(flags&2))
00882            || st->discard >= AVDISCARD_ALL){
00883             av_free_packet(pkt);
00884         } else
00885             break;
00886     }
00887 
00888     return 0;
00889 }
00890 
00891 static int rm_read_close(AVFormatContext *s)
00892 {
00893     int i;
00894 
00895     for (i=0;i<s->nb_streams;i++)
00896         ff_rm_free_rmstream(s->streams[i]->priv_data);
00897 
00898     return 0;
00899 }
00900 
00901 static int rm_probe(AVProbeData *p)
00902 {
00903     /* check file header */
00904     if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
00905          p->buf[2] == 'M' && p->buf[3] == 'F' &&
00906          p->buf[4] == 0 && p->buf[5] == 0) ||
00907         (p->buf[0] == '.' && p->buf[1] == 'r' &&
00908          p->buf[2] == 'a' && p->buf[3] == 0xfd))
00909         return AVPROBE_SCORE_MAX;
00910     else
00911         return 0;
00912 }
00913 
00914 static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
00915                                int64_t *ppos, int64_t pos_limit)
00916 {
00917     RMDemuxContext *rm = s->priv_data;
00918     int64_t pos, dts;
00919     int stream_index2, flags, len, h;
00920 
00921     pos = *ppos;
00922 
00923     if(rm->old_format)
00924         return AV_NOPTS_VALUE;
00925 
00926     url_fseek(s->pb, pos, SEEK_SET);
00927     rm->remaining_len=0;
00928     for(;;){
00929         int seq=1;
00930         AVStream *st;
00931 
00932         len=sync(s, &dts, &flags, &stream_index2, &pos);
00933         if(len<0)
00934             return AV_NOPTS_VALUE;
00935 
00936         st = s->streams[stream_index2];
00937         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
00938             h= get_byte(s->pb); len--;
00939             if(!(h & 0x40)){
00940                 seq = get_byte(s->pb); len--;
00941             }
00942         }
00943 
00944         if((flags&2) && (seq&0x7F) == 1){
00945 //            av_log(s, AV_LOG_DEBUG, "%d %d-%d %"PRId64" %d\n", flags, stream_index2, stream_index, dts, seq);
00946             av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);
00947             if(stream_index2 == stream_index)
00948                 break;
00949         }
00950 
00951         url_fskip(s->pb, len);
00952     }
00953     *ppos = pos;
00954     return dts;
00955 }
00956 
00957 AVInputFormat rm_demuxer = {
00958     "rm",
00959     NULL_IF_CONFIG_SMALL("RealMedia format"),
00960     sizeof(RMDemuxContext),
00961     rm_probe,
00962     rm_read_header,
00963     rm_read_packet,
00964     rm_read_close,
00965     NULL,
00966     rm_read_dts,
00967 };
00968 
00969 AVInputFormat rdt_demuxer = {
00970     "rdt",
00971     NULL_IF_CONFIG_SMALL("RDT demuxer"),
00972     sizeof(RMDemuxContext),
00973     NULL,
00974     NULL,
00975     NULL,
00976     rm_read_close,
00977 };