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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 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 "rm.h"
00026 
00027 struct RMStream {
00028     AVPacket pkt;      
00029     int videobufsize;  
00030     int videobufpos;   
00031     int curpic_num;    
00032     int cur_slice, slices;
00033     int64_t pktpos;    
00034 
00035     int64_t audiotimestamp; 
00036     int sub_packet_cnt; // Subpacket counter, used while reading
00037     int sub_packet_size, sub_packet_h, coded_framesize; 
00038     int audio_framesize; 
00039     int sub_packet_lengths[16]; 
00040 };
00041 
00042 typedef struct {
00043     int nb_packets;
00044     int old_format;
00045     int current_stream;
00046     int remaining_len;
00047     int audio_stream_num; 
00048     int audio_pkt_cnt; 
00049 } RMDemuxContext;
00050 
00051 static inline void get_strl(ByteIOContext *pb, char *buf, int buf_size, int len)
00052 {
00053     int i;
00054     char *q, r;
00055 
00056     q = buf;
00057     for(i=0;i<len;i++) {
00058         r = get_byte(pb);
00059         if (i < buf_size - 1)
00060             *q++ = r;
00061     }
00062     if (buf_size > 0) *q = '\0';
00063 }
00064 
00065 static void get_str8(ByteIOContext *pb, char *buf, int buf_size)
00066 {
00067     get_strl(pb, buf, buf_size, get_byte(pb));
00068 }
00069 
00070 static void rm_read_metadata(AVFormatContext *s, int wide)
00071 {
00072     char buf[1024];
00073     int i;
00074     for (i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
00075         int len = wide ? get_be16(s->pb) : get_byte(s->pb);
00076         get_strl(s->pb, buf, sizeof(buf), len);
00077         av_metadata_set(&s->metadata, ff_rm_metadata[i], buf);
00078     }
00079 }
00080 
00081 RMStream *ff_rm_alloc_rmstream (void)
00082 {
00083     RMStream *rms = av_mallocz(sizeof(RMStream));
00084     rms->curpic_num = -1;
00085     return rms;
00086 }
00087 
00088 void ff_rm_free_rmstream (RMStream *rms)
00089 {
00090     av_free_packet(&rms->pkt);
00091 }
00092 
00093 static int rm_read_audio_stream_info(AVFormatContext *s, ByteIOContext *pb,
00094                                      AVStream *st, RMStream *ast, int read_all)
00095 {
00096     char buf[256];
00097     uint32_t version;
00098 
00099     /* ra type header */
00100     version = get_be32(pb); /* version */
00101     if (((version >> 16) & 0xff) == 3) {
00102         int64_t startpos = url_ftell(pb);
00103         url_fskip(pb, 14);
00104         rm_read_metadata(s, 0);
00105         if ((startpos + (version & 0xffff)) >= url_ftell(pb) + 2) {
00106             // fourcc (should always be "lpcJ")
00107             get_byte(pb);
00108             get_str8(pb, buf, sizeof(buf));
00109         }
00110         // Skip extra header crap (this should never happen)
00111         if ((startpos + (version & 0xffff)) > url_ftell(pb))
00112             url_fskip(pb, (version & 0xffff) + startpos - url_ftell(pb));
00113         st->codec->sample_rate = 8000;
00114         st->codec->channels = 1;
00115         st->codec->codec_type = CODEC_TYPE_AUDIO;
00116         st->codec->codec_id = CODEC_ID_RA_144;
00117     } else {
00118         int flavor, sub_packet_h, coded_framesize, sub_packet_size;
00119         /* old version (4) */
00120         get_be32(pb); /* .ra4 */
00121         get_be32(pb); /* data size */
00122         get_be16(pb); /* version2 */
00123         get_be32(pb); /* header size */
00124         flavor= get_be16(pb); /* add codec info / flavor */
00125         ast->coded_framesize = coded_framesize = get_be32(pb); /* coded frame size */
00126         get_be32(pb); /* ??? */
00127         get_be32(pb); /* ??? */
00128         get_be32(pb); /* ??? */
00129         ast->sub_packet_h = sub_packet_h = get_be16(pb); /* 1 */
00130         st->codec->block_align= get_be16(pb); /* frame size */
00131         ast->sub_packet_size = sub_packet_size = get_be16(pb); /* sub packet size */
00132         get_be16(pb); /* ??? */
00133         if (((version >> 16) & 0xff) == 5) {
00134             get_be16(pb); get_be16(pb); get_be16(pb);
00135         }
00136         st->codec->sample_rate = get_be16(pb);
00137         get_be32(pb);
00138         st->codec->channels = get_be16(pb);
00139         if (((version >> 16) & 0xff) == 5) {
00140             get_be32(pb);
00141             get_buffer(pb, buf, 4);
00142             buf[4] = 0;
00143         } else {
00144             get_str8(pb, buf, sizeof(buf)); /* desc */
00145             get_str8(pb, buf, sizeof(buf)); /* desc */
00146         }
00147         st->codec->codec_type = CODEC_TYPE_AUDIO;
00148         if (!strcmp(buf, "dnet")) {
00149             st->codec->codec_id = CODEC_ID_AC3;
00150             st->need_parsing = AVSTREAM_PARSE_FULL;
00151         } else if (!strcmp(buf, "28_8")) {
00152             st->codec->codec_id = CODEC_ID_RA_288;
00153             st->codec->extradata_size= 0;
00154             ast->audio_framesize = st->codec->block_align;
00155             st->codec->block_align = coded_framesize;
00156 
00157             if(ast->audio_framesize >= UINT_MAX / sub_packet_h){
00158                 av_log(s, AV_LOG_ERROR, "ast->audio_framesize * sub_packet_h too large\n");
00159                 return -1;
00160             }
00161 
00162             av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h);
00163         } else if ((!strcmp(buf, "cook")) || (!strcmp(buf, "atrc")) || (!strcmp(buf, "sipr"))) {
00164             int codecdata_length;
00165             get_be16(pb); get_byte(pb);
00166             if (((version >> 16) & 0xff) == 5)
00167                 get_byte(pb);
00168             codecdata_length = get_be32(pb);
00169             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
00170                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
00171                 return -1;
00172             }
00173 
00174             if(sub_packet_size <= 0){
00175                 av_log(s, AV_LOG_ERROR, "sub_packet_size is invalid\n");
00176                 return -1;
00177             }
00178 
00179             if (!strcmp(buf, "cook")) st->codec->codec_id = CODEC_ID_COOK;
00180             else if (!strcmp(buf, "sipr")) st->codec->codec_id = CODEC_ID_SIPR;
00181             else st->codec->codec_id = CODEC_ID_ATRAC3;
00182             st->codec->extradata_size= codecdata_length;
00183             st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00184             get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
00185             ast->audio_framesize = st->codec->block_align;
00186             st->codec->block_align = ast->sub_packet_size;
00187 
00188             if(ast->audio_framesize >= UINT_MAX / sub_packet_h){
00189                 av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
00190                 return -1;
00191             }
00192 
00193             av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h);
00194         } else if (!strcmp(buf, "raac") || !strcmp(buf, "racp")) {
00195             int codecdata_length;
00196             get_be16(pb); get_byte(pb);
00197             if (((version >> 16) & 0xff) == 5)
00198                 get_byte(pb);
00199             st->codec->codec_id = CODEC_ID_AAC;
00200             codecdata_length = get_be32(pb);
00201             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
00202                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
00203                 return -1;
00204             }
00205             if (codecdata_length >= 1) {
00206                 st->codec->extradata_size = codecdata_length - 1;
00207                 st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00208                 get_byte(pb);
00209                 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
00210             }
00211         } else {
00212             st->codec->codec_id = CODEC_ID_NONE;
00213             av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));
00214         }
00215         if (read_all) {
00216             get_byte(pb);
00217             get_byte(pb);
00218             get_byte(pb);
00219             rm_read_metadata(s, 0);
00220         }
00221     }
00222     return 0;
00223 }
00224 
00225 int
00226 ff_rm_read_mdpr_codecdata (AVFormatContext *s, ByteIOContext *pb,
00227                            AVStream *st, RMStream *rst, int codec_data_size)
00228 {
00229     unsigned int v;
00230     int size;
00231     int64_t codec_pos;
00232 
00233     av_set_pts_info(st, 64, 1, 1000);
00234     codec_pos = url_ftell(pb);
00235     v = get_be32(pb);
00236     if (v == MKTAG(0xfd, 'a', 'r', '.')) {
00237         /* ra type header */
00238         if (rm_read_audio_stream_info(s, pb, st, rst, 0))
00239             return -1;
00240     } else {
00241         int fps, fps2;
00242         if (get_le32(pb) != MKTAG('V', 'I', 'D', 'O')) {
00243         fail1:
00244             av_log(st->codec, AV_LOG_ERROR, "Unsupported video codec\n");
00245             goto skip;
00246         }
00247         st->codec->codec_tag = get_le32(pb);
00248 //        av_log(s, AV_LOG_DEBUG, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));
00249         if (   st->codec->codec_tag != MKTAG('R', 'V', '1', '0')
00250             && st->codec->codec_tag != MKTAG('R', 'V', '2', '0')
00251             && st->codec->codec_tag != MKTAG('R', 'V', '3', '0')
00252             && st->codec->codec_tag != MKTAG('R', 'V', '4', '0')
00253             && st->codec->codec_tag != MKTAG('R', 'V', 'T', 'R'))
00254             goto fail1;
00255         st->codec->width = get_be16(pb);
00256         st->codec->height = get_be16(pb);
00257         st->codec->time_base.num= 1;
00258         fps= get_be16(pb);
00259         st->codec->codec_type = CODEC_TYPE_VIDEO;
00260         get_be32(pb);
00261         fps2= get_be16(pb);
00262         get_be16(pb);
00263 
00264         st->codec->extradata_size= codec_data_size - (url_ftell(pb) - codec_pos);
00265 
00266         if(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){
00267             //check is redundant as get_buffer() will catch this
00268             av_log(s, AV_LOG_ERROR, "st->codec->extradata_size too large\n");
00269             return -1;
00270         }
00271         st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00272         if (!st->codec->extradata)
00273             return AVERROR(ENOMEM);
00274         get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
00275 
00276 //        av_log(s, AV_LOG_DEBUG, "fps= %d fps2= %d\n", fps, fps2);
00277         st->codec->time_base.den = fps * st->codec->time_base.num;
00278         switch(((uint8_t*)st->codec->extradata)[4]>>4){
00279         case 1: st->codec->codec_id = CODEC_ID_RV10; break;
00280         case 2: st->codec->codec_id = CODEC_ID_RV20; break;
00281         case 3: st->codec->codec_id = CODEC_ID_RV30; break;
00282         case 4: st->codec->codec_id = CODEC_ID_RV40; break;
00283         default: goto fail1;
00284         }
00285     }
00286 
00287 skip:
00288     /* skip codec info */
00289     size = url_ftell(pb) - codec_pos;
00290     url_fskip(pb, codec_data_size - size);
00291 
00292     return 0;
00293 }
00294 
00295 
00296 static int rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap)
00297 {
00298     RMDemuxContext *rm = s->priv_data;
00299     AVStream *st;
00300 
00301     rm->old_format = 1;
00302     st = av_new_stream(s, 0);
00303     if (!st)
00304         return -1;
00305     st->priv_data = ff_rm_alloc_rmstream();
00306     return rm_read_audio_stream_info(s, s->pb, st, st->priv_data, 1);
00307 }
00308 
00309 static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
00310 {
00311     RMDemuxContext *rm = s->priv_data;
00312     AVStream *st;
00313     ByteIOContext *pb = s->pb;
00314     unsigned int tag;
00315     int tag_size;
00316     unsigned int start_time, duration;
00317     char buf[128];
00318     int flags = 0;
00319 
00320     tag = get_le32(pb);
00321     if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
00322         /* very old .ra format */
00323         return rm_read_header_old(s, ap);
00324     } else if (tag != MKTAG('.', 'R', 'M', 'F')) {
00325         return AVERROR(EIO);
00326     }
00327 
00328     get_be32(pb); /* header size */
00329     get_be16(pb);
00330     get_be32(pb);
00331     get_be32(pb); /* number of headers */
00332 
00333     for(;;) {
00334         if (url_feof(pb))
00335             return -1;
00336         tag = get_le32(pb);
00337         tag_size = get_be32(pb);
00338         get_be16(pb);
00339 #if 0
00340         printf("tag=%c%c%c%c (%08x) size=%d\n",
00341                (tag) & 0xff,
00342                (tag >> 8) & 0xff,
00343                (tag >> 16) & 0xff,
00344                (tag >> 24) & 0xff,
00345                tag,
00346                tag_size);
00347 #endif
00348         if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
00349             return -1;
00350         switch(tag) {
00351         case MKTAG('P', 'R', 'O', 'P'):
00352             /* file header */
00353             get_be32(pb); /* max bit rate */
00354             get_be32(pb); /* avg bit rate */
00355             get_be32(pb); /* max packet size */
00356             get_be32(pb); /* avg packet size */
00357             get_be32(pb); /* nb packets */
00358             get_be32(pb); /* duration */
00359             get_be32(pb); /* preroll */
00360             get_be32(pb); /* index offset */
00361             get_be32(pb); /* data offset */
00362             get_be16(pb); /* nb streams */
00363             flags = get_be16(pb); /* flags */
00364             break;
00365         case MKTAG('C', 'O', 'N', 'T'):
00366             rm_read_metadata(s, 1);
00367             break;
00368         case MKTAG('M', 'D', 'P', 'R'):
00369             st = av_new_stream(s, 0);
00370             if (!st)
00371                 return AVERROR(ENOMEM);
00372             st->id = get_be16(pb);
00373             get_be32(pb); /* max bit rate */
00374             st->codec->bit_rate = get_be32(pb); /* bit rate */
00375             get_be32(pb); /* max packet size */
00376             get_be32(pb); /* avg packet size */
00377             start_time = get_be32(pb); /* start time */
00378             get_be32(pb); /* preroll */
00379             duration = get_be32(pb); /* duration */
00380             st->start_time = start_time;
00381             st->duration = duration;
00382             get_str8(pb, buf, sizeof(buf)); /* desc */
00383             get_str8(pb, buf, sizeof(buf)); /* mimetype */
00384             st->codec->codec_type = CODEC_TYPE_DATA;
00385             st->priv_data = ff_rm_alloc_rmstream();
00386             if (ff_rm_read_mdpr_codecdata(s, s->pb, st, st->priv_data,
00387                                           get_be32(pb)) < 0)
00388                 return -1;
00389             break;
00390         case MKTAG('D', 'A', 'T', 'A'):
00391             goto header_end;
00392         default:
00393             /* unknown tag: skip it */
00394             url_fskip(pb, tag_size - 10);
00395             break;
00396         }
00397     }
00398  header_end:
00399     rm->nb_packets = get_be32(pb); /* number of packets */
00400     if (!rm->nb_packets && (flags & 4))
00401         rm->nb_packets = 3600 * 25;
00402     get_be32(pb); /* next data header */
00403     return 0;
00404 }
00405 
00406 static int get_num(ByteIOContext *pb, int *len)
00407 {
00408     int n, n1;
00409 
00410     n = get_be16(pb);
00411     (*len)-=2;
00412     n &= 0x7FFF;
00413     if (n >= 0x4000) {
00414         return n - 0x4000;
00415     } else {
00416         n1 = get_be16(pb);
00417         (*len)-=2;
00418         return (n << 16) | n1;
00419     }
00420 }
00421 
00422 /* multiple of 20 bytes for ra144 (ugly) */
00423 #define RAW_PACKET_SIZE 1000
00424 
00425 static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
00426     RMDemuxContext *rm = s->priv_data;
00427     ByteIOContext *pb = s->pb;
00428     int len, num, res, i;
00429     AVStream *st;
00430     uint32_t state=0xFFFFFFFF;
00431 
00432     while(!url_feof(pb)){
00433         *pos= url_ftell(pb) - 3;
00434         if(rm->remaining_len > 0){
00435             num= rm->current_stream;
00436             len= rm->remaining_len;
00437             *timestamp = AV_NOPTS_VALUE;
00438             *flags= 0;
00439         }else{
00440             state= (state<<8) + get_byte(pb);
00441 
00442             if(state == MKBETAG('I', 'N', 'D', 'X')){
00443                 len = get_be16(pb) - 6;
00444                 if(len<0)
00445                     continue;
00446                 goto skip;
00447             }
00448 
00449             if(state > (unsigned)0xFFFF || state < 12)
00450                 continue;
00451             len=state;
00452             state= 0xFFFFFFFF;
00453 
00454             num = get_be16(pb);
00455             *timestamp = get_be32(pb);
00456             res= get_byte(pb); /* reserved */
00457             *flags = get_byte(pb); /* flags */
00458 
00459 
00460             len -= 12;
00461         }
00462         for(i=0;i<s->nb_streams;i++) {
00463             st = s->streams[i];
00464             if (num == st->id)
00465                 break;
00466         }
00467         if (i == s->nb_streams) {
00468 skip:
00469             /* skip packet if unknown number */
00470             url_fskip(pb, len);
00471             rm->remaining_len -= len;
00472             continue;
00473         }
00474         *stream_index= i;
00475 
00476         return len;
00477     }
00478     return -1;
00479 }
00480 
00481 static int rm_assemble_video_frame(AVFormatContext *s, ByteIOContext *pb,
00482                                    RMDemuxContext *rm, RMStream *vst,
00483                                    AVPacket *pkt, int len)
00484 {
00485     int hdr, seq, pic_num, len2, pos;
00486     int type;
00487 
00488     hdr = get_byte(pb); len--;
00489     type = hdr >> 6;
00490 
00491     if(type != 3){  // not frame as a part of packet
00492         seq = get_byte(pb); len--;
00493     }
00494     if(type != 1){  // not whole frame
00495         len2 = get_num(pb, &len);
00496         pos  = get_num(pb, &len);
00497         pic_num = get_byte(pb); len--;
00498     }
00499     if(len<0)
00500         return -1;
00501     rm->remaining_len = len;
00502     if(type&1){     // frame, not slice
00503         if(type == 3)  // frame as a part of packet
00504             len= len2;
00505         if(rm->remaining_len < len)
00506             return -1;
00507         rm->remaining_len -= len;
00508         if(av_new_packet(pkt, len + 9) < 0)
00509             return AVERROR(EIO);
00510         pkt->data[0] = 0;
00511         AV_WL32(pkt->data + 1, 1);
00512         AV_WL32(pkt->data + 5, 0);
00513         get_buffer(pb, pkt->data + 9, len);
00514         return 0;
00515     }
00516     //now we have to deal with single slice
00517 
00518     if((seq & 0x7F) == 1 || vst->curpic_num != pic_num){
00519         vst->slices = ((hdr & 0x3F) << 1) + 1;
00520         vst->videobufsize = len2 + 8*vst->slices + 1;
00521         av_free_packet(&vst->pkt); //FIXME this should be output.
00522         if(av_new_packet(&vst->pkt, vst->videobufsize) < 0)
00523             return AVERROR(ENOMEM);
00524         vst->videobufpos = 8*vst->slices + 1;
00525         vst->cur_slice = 0;
00526         vst->curpic_num = pic_num;
00527         vst->pktpos = url_ftell(pb);
00528     }
00529     if(type == 2)
00530         len = FFMIN(len, pos);
00531 
00532     if(++vst->cur_slice > vst->slices)
00533         return 1;
00534     AV_WL32(vst->pkt.data - 7 + 8*vst->cur_slice, 1);
00535     AV_WL32(vst->pkt.data - 3 + 8*vst->cur_slice, vst->videobufpos - 8*vst->slices - 1);
00536     if(vst->videobufpos + len > vst->videobufsize)
00537         return 1;
00538     if (get_buffer(pb, vst->pkt.data + vst->videobufpos, len) != len)
00539         return AVERROR(EIO);
00540     vst->videobufpos += len;
00541     rm->remaining_len-= len;
00542 
00543     if(type == 2 || (vst->videobufpos) == vst->videobufsize){
00544         vst->pkt.data[0] = vst->cur_slice-1;
00545         *pkt= vst->pkt;
00546         vst->pkt.data= NULL;
00547         vst->pkt.size= 0;
00548         if(vst->slices != vst->cur_slice) //FIXME find out how to set slices correct from the begin
00549             memmove(pkt->data + 1 + 8*vst->cur_slice, pkt->data + 1 + 8*vst->slices,
00550                 vst->videobufpos - 1 - 8*vst->slices);
00551         pkt->size = vst->videobufpos + 8*(vst->cur_slice - vst->slices);
00552         pkt->pts = AV_NOPTS_VALUE;
00553         pkt->pos = vst->pktpos;
00554         return 0;
00555     }
00556 
00557     return 1;
00558 }
00559 
00560 static inline void
00561 rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt)
00562 {
00563     uint8_t *ptr;
00564     int j;
00565 
00566     if (st->codec->codec_id == CODEC_ID_AC3) {
00567         ptr = pkt->data;
00568         for (j=0;j<pkt->size;j+=2) {
00569             FFSWAP(int, ptr[0], ptr[1]);
00570             ptr += 2;
00571         }
00572     }
00573 }
00574 
00575 int
00576 ff_rm_parse_packet (AVFormatContext *s, ByteIOContext *pb,
00577                     AVStream *st, RMStream *ast, int len, AVPacket *pkt,
00578                     int *seq, int *flags, int64_t *timestamp)
00579 {
00580     RMDemuxContext *rm = s->priv_data;
00581 
00582     if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
00583         rm->current_stream= st->id;
00584         if(rm_assemble_video_frame(s, pb, rm, ast, pkt, len))
00585             return -1; //got partial frame
00586     } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
00587         if ((st->codec->codec_id == CODEC_ID_RA_288) ||
00588             (st->codec->codec_id == CODEC_ID_COOK) ||
00589             (st->codec->codec_id == CODEC_ID_ATRAC3) ||
00590             (st->codec->codec_id == CODEC_ID_SIPR)) {
00591             int x;
00592             int sps = ast->sub_packet_size;
00593             int cfs = ast->coded_framesize;
00594             int h = ast->sub_packet_h;
00595             int y = ast->sub_packet_cnt;
00596             int w = ast->audio_framesize;
00597 
00598             if (*flags & 2)
00599                 y = ast->sub_packet_cnt = 0;
00600             if (!y)
00601                 ast->audiotimestamp = *timestamp;
00602 
00603             switch(st->codec->codec_id) {
00604                 case CODEC_ID_RA_288:
00605                     for (x = 0; x < h/2; x++)
00606                         get_buffer(pb, ast->pkt.data+x*2*w+y*cfs, cfs);
00607                     break;
00608                 case CODEC_ID_ATRAC3:
00609                 case CODEC_ID_COOK:
00610                     for (x = 0; x < w/sps; x++)
00611                         get_buffer(pb, ast->pkt.data+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
00612                     break;
00613             }
00614 
00615             if (++(ast->sub_packet_cnt) < h)
00616                 return -1;
00617             else {
00618                 ast->sub_packet_cnt = 0;
00619                 rm->audio_stream_num = st->index;
00620                 rm->audio_pkt_cnt = h * w / st->codec->block_align - 1;
00621                 // Release first audio packet
00622                 av_new_packet(pkt, st->codec->block_align);
00623                 memcpy(pkt->data, ast->pkt.data, st->codec->block_align); //FIXME avoid this
00624                 *timestamp = ast->audiotimestamp;
00625                 *flags = 2; // Mark first packet as keyframe
00626             }
00627         } else if (st->codec->codec_id == CODEC_ID_AAC) {
00628             int x;
00629             rm->audio_stream_num = st->index;
00630             ast->sub_packet_cnt = (get_be16(pb) & 0xf0) >> 4;
00631             if (ast->sub_packet_cnt) {
00632                 for (x = 0; x < ast->sub_packet_cnt; x++)
00633                     ast->sub_packet_lengths[x] = get_be16(pb);
00634                 // Release first audio packet
00635                 rm->audio_pkt_cnt = ast->sub_packet_cnt - 1;
00636                 av_get_packet(pb, pkt, ast->sub_packet_lengths[0]);
00637                 *flags = 2; // Mark first packet as keyframe
00638             }
00639         } else {
00640             av_get_packet(pb, pkt, len);
00641             rm_ac3_swap_bytes(st, pkt);
00642         }
00643     } else
00644         av_get_packet(pb, pkt, len);
00645 
00646     if(  (st->discard >= AVDISCARD_NONKEY && !(*flags&2))
00647        || st->discard >= AVDISCARD_ALL){
00648         av_free_packet(pkt);
00649         return -1;
00650     }
00651 
00652     pkt->stream_index = st->index;
00653 
00654 #if 0
00655     if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
00656         if(st->codec->codec_id == CODEC_ID_RV20){
00657             int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
00658             av_log(s, AV_LOG_DEBUG, "%d %"PRId64" %d\n", *timestamp, *timestamp*512LL/25, seq);
00659 
00660             seq |= (*timestamp&~0x3FFF);
00661             if(seq - *timestamp >  0x2000) seq -= 0x4000;
00662             if(seq - *timestamp < -0x2000) seq += 0x4000;
00663         }
00664     }
00665 #endif
00666 
00667     pkt->pts= *timestamp;
00668     if (*flags & 2)
00669         pkt->flags |= PKT_FLAG_KEY;
00670 
00671     return st->codec->codec_type == CODEC_TYPE_AUDIO ? rm->audio_pkt_cnt : 0;
00672 }
00673 
00674 int
00675 ff_rm_retrieve_cache (AVFormatContext *s, ByteIOContext *pb,
00676                       AVStream *st, RMStream *ast, AVPacket *pkt)
00677 {
00678     RMDemuxContext *rm = s->priv_data;
00679 
00680     assert (rm->audio_pkt_cnt > 0);
00681 
00682     if (st->codec->codec_id == CODEC_ID_AAC)
00683         av_get_packet(pb, pkt, ast->sub_packet_lengths[ast->sub_packet_cnt - rm->audio_pkt_cnt]);
00684     else {
00685         av_new_packet(pkt, st->codec->block_align);
00686         memcpy(pkt->data, ast->pkt.data + st->codec->block_align * //FIXME avoid this
00687                (ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
00688                st->codec->block_align);
00689     }
00690     rm->audio_pkt_cnt--;
00691     pkt->flags = 0;
00692     pkt->stream_index = st->index;
00693 
00694     return rm->audio_pkt_cnt;
00695 }
00696 
00697 static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
00698 {
00699     RMDemuxContext *rm = s->priv_data;
00700     ByteIOContext *pb = s->pb;
00701     AVStream *st;
00702     int i, len;
00703     int64_t timestamp, pos;
00704     int flags;
00705 
00706     if (rm->audio_pkt_cnt) {
00707         // If there are queued audio packet return them first
00708         st = s->streams[rm->audio_stream_num];
00709         ff_rm_retrieve_cache(s, s->pb, st, st->priv_data, pkt);
00710     } else if (rm->old_format) {
00711         RMStream *ast;
00712 
00713         st = s->streams[0];
00714         ast = st->priv_data;
00715         if (st->codec->codec_id == CODEC_ID_RA_288) {
00716             int x, y;
00717 
00718             for (y = 0; y < ast->sub_packet_h; y++)
00719                 for (x = 0; x < ast->sub_packet_h/2; x++)
00720                     if (get_buffer(pb, ast->pkt.data+x*2*ast->audio_framesize+y*ast->coded_framesize, ast->coded_framesize) <= 0)
00721                         return AVERROR(EIO);
00722             rm->audio_stream_num = 0;
00723             rm->audio_pkt_cnt = ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - 1;
00724             // Release first audio packet
00725             av_new_packet(pkt, st->codec->block_align);
00726             memcpy(pkt->data, ast->pkt.data, st->codec->block_align); //FIXME avoid this
00727             pkt->flags |= PKT_FLAG_KEY; // Mark first packet as keyframe
00728             pkt->stream_index = 0;
00729         } else {
00730             /* just read raw bytes */
00731             len = RAW_PACKET_SIZE;
00732             len= av_get_packet(pb, pkt, len);
00733             pkt->stream_index = 0;
00734             if (len <= 0) {
00735                 return AVERROR(EIO);
00736             }
00737             pkt->size = len;
00738         }
00739         rm_ac3_swap_bytes(st, pkt);
00740     } else {
00741         int seq=1;
00742 resync:
00743         len=sync(s, &timestamp, &flags, &i, &pos);
00744         if(len<0)
00745             return AVERROR(EIO);
00746         st = s->streams[i];
00747 
00748         if (ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,
00749                                 &seq, &flags, &timestamp) < 0)
00750             goto resync;
00751 
00752         if((flags&2) && (seq&0x7F) == 1)
00753             av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
00754     }
00755 
00756     return 0;
00757 }
00758 
00759 static int rm_read_close(AVFormatContext *s)
00760 {
00761     int i;
00762 
00763     for (i=0;i<s->nb_streams;i++)
00764         ff_rm_free_rmstream(s->streams[i]->priv_data);
00765 
00766     return 0;
00767 }
00768 
00769 static int rm_probe(AVProbeData *p)
00770 {
00771     /* check file header */
00772     if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
00773          p->buf[2] == 'M' && p->buf[3] == 'F' &&
00774          p->buf[4] == 0 && p->buf[5] == 0) ||
00775         (p->buf[0] == '.' && p->buf[1] == 'r' &&
00776          p->buf[2] == 'a' && p->buf[3] == 0xfd))
00777         return AVPROBE_SCORE_MAX;
00778     else
00779         return 0;
00780 }
00781 
00782 static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
00783                                int64_t *ppos, int64_t pos_limit)
00784 {
00785     RMDemuxContext *rm = s->priv_data;
00786     int64_t pos, dts;
00787     int stream_index2, flags, len, h;
00788 
00789     pos = *ppos;
00790 
00791     if(rm->old_format)
00792         return AV_NOPTS_VALUE;
00793 
00794     url_fseek(s->pb, pos, SEEK_SET);
00795     rm->remaining_len=0;
00796     for(;;){
00797         int seq=1;
00798         AVStream *st;
00799 
00800         len=sync(s, &dts, &flags, &stream_index2, &pos);
00801         if(len<0)
00802             return AV_NOPTS_VALUE;
00803 
00804         st = s->streams[stream_index2];
00805         if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
00806             h= get_byte(s->pb); len--;
00807             if(!(h & 0x40)){
00808                 seq = get_byte(s->pb); len--;
00809             }
00810         }
00811 
00812         if((flags&2) && (seq&0x7F) == 1){
00813 //            av_log(s, AV_LOG_DEBUG, "%d %d-%d %"PRId64" %d\n", flags, stream_index2, stream_index, dts, seq);
00814             av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);
00815             if(stream_index2 == stream_index)
00816                 break;
00817         }
00818 
00819         url_fskip(s->pb, len);
00820     }
00821     *ppos = pos;
00822     return dts;
00823 }
00824 
00825 AVInputFormat rm_demuxer = {
00826     "rm",
00827     NULL_IF_CONFIG_SMALL("RealMedia format"),
00828     sizeof(RMDemuxContext),
00829     rm_probe,
00830     rm_read_header,
00831     rm_read_packet,
00832     rm_read_close,
00833     NULL,
00834     rm_read_dts,
00835 };
00836 
00837 AVInputFormat rdt_demuxer = {
00838     "rdt",
00839     NULL_IF_CONFIG_SMALL("RDT demuxer"),
00840     sizeof(RMDemuxContext),
00841     NULL,
00842     NULL,
00843     NULL,
00844     rm_read_close,
00845 };

Generated on Tue Nov 4 2014 12:59:24 for ffmpeg by  doxygen 1.7.1