MythTV: 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 #include "avformat.h"
00022 #include "rm.h"
00023 #include "avstring.h"
00024 
00025 static inline void get_strl(ByteIOContext *pb, char *buf, int buf_size, int len)
00026 {
00027     int i;
00028     char *q, r;
00029 
00030     q = buf;
00031     for(i=0;i<len;i++) {
00032         r = get_byte(pb);
00033         if (i < buf_size - 1)
00034             *q++ = r;
00035     }
00036     if (buf_size > 0) *q = '\0';
00037 }
00038 
00039 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
00040 {
00041     get_strl(pb, buf, buf_size, get_be16(pb));
00042 }
00043 
00044 static void get_str8(ByteIOContext *pb, char *buf, int buf_size)
00045 {
00046     get_strl(pb, buf, buf_size, get_byte(pb));
00047 }
00048 
00049 static int rm_read_audio_stream_info(AVFormatContext *s, AVStream *st,
00050                                       int read_all)
00051 {
00052     RMContext *rm = s->priv_data;
00053     ByteIOContext *pb = &s->pb;
00054     char buf[256];
00055     uint32_t version;
00056     int i;
00057 
00058     /* ra type header */
00059     version = get_be32(pb); /* version */
00060     if (((version >> 16) & 0xff) == 3) {
00061         int64_t startpos = url_ftell(pb);
00062         /* very old version */
00063         for(i = 0; i < 14; i++)
00064             get_byte(pb);
00065         get_str8(pb, s->title, sizeof(s->title));
00066         get_str8(pb, s->author, sizeof(s->author));
00067         get_str8(pb, s->copyright, sizeof(s->copyright));
00068         get_str8(pb, s->comment, sizeof(s->comment));
00069         if ((startpos + (version & 0xffff)) >= url_ftell(pb) + 2) {
00070         // fourcc (should always be "lpcJ")
00071         get_byte(pb);
00072         get_str8(pb, buf, sizeof(buf));
00073         }
00074         // Skip extra header crap (this should never happen)
00075         if ((startpos + (version & 0xffff)) > url_ftell(pb))
00076             url_fskip(pb, (version & 0xffff) + startpos - url_ftell(pb));
00077         st->codec->sample_rate = 8000;
00078         st->codec->channels = 1;
00079         st->codec->codec_type = CODEC_TYPE_AUDIO;
00080         st->codec->codec_id = CODEC_ID_RA_144;
00081     } else {
00082         int flavor, sub_packet_h, coded_framesize, sub_packet_size;
00083         /* old version (4) */
00084         get_be32(pb); /* .ra4 */
00085         get_be32(pb); /* data size */
00086         get_be16(pb); /* version2 */
00087         get_be32(pb); /* header size */
00088         flavor= get_be16(pb); /* add codec info / flavor */
00089         rm->coded_framesize = coded_framesize = get_be32(pb); /* coded frame size */
00090         get_be32(pb); /* ??? */
00091         get_be32(pb); /* ??? */
00092         get_be32(pb); /* ??? */
00093         rm->sub_packet_h = sub_packet_h = get_be16(pb); /* 1 */
00094         st->codec->block_align= get_be16(pb); /* frame size */
00095         rm->sub_packet_size = sub_packet_size = get_be16(pb); /* sub packet size */
00096         get_be16(pb); /* ??? */
00097         if (((version >> 16) & 0xff) == 5) {
00098             get_be16(pb); get_be16(pb); get_be16(pb); }
00099         st->codec->sample_rate = get_be16(pb);
00100         get_be32(pb);
00101         st->codec->channels = get_be16(pb);
00102         if (((version >> 16) & 0xff) == 5) {
00103             get_be32(pb);
00104             buf[0] = get_byte(pb);
00105             buf[1] = get_byte(pb);
00106             buf[2] = get_byte(pb);
00107             buf[3] = get_byte(pb);
00108             buf[4] = 0;
00109         } else {
00110             get_str8(pb, buf, sizeof(buf)); /* desc */
00111             get_str8(pb, buf, sizeof(buf)); /* desc */
00112         }
00113         st->codec->codec_type = CODEC_TYPE_AUDIO;
00114         if (!strcmp(buf, "dnet")) {
00115             st->codec->codec_id = CODEC_ID_AC3;
00116             st->need_parsing = AVSTREAM_PARSE_FULL;
00117         } else if (!strcmp(buf, "28_8")) {
00118             st->codec->codec_id = CODEC_ID_RA_288;
00119             st->codec->extradata_size= 0;
00120             rm->audio_framesize = st->codec->block_align;
00121             st->codec->block_align = coded_framesize;
00122 
00123             if(rm->audio_framesize >= UINT_MAX / sub_packet_h){
00124                 av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
00125                 return -1;
00126             }
00127 
00128             rm->audiobuf = av_malloc(rm->audio_framesize * sub_packet_h);
00129         } else if ((!strcmp(buf, "cook")) || (!strcmp(buf, "atrc"))) {
00130             int codecdata_length, i;
00131             get_be16(pb); get_byte(pb);
00132             if (((version >> 16) & 0xff) == 5)
00133                 get_byte(pb);
00134             codecdata_length = get_be32(pb);
00135             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
00136                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
00137                 return -1;
00138             }
00139 
00140             if (!strcmp(buf, "cook")) st->codec->codec_id = CODEC_ID_COOK;
00141             else st->codec->codec_id = CODEC_ID_ATRAC3;
00142             st->codec->extradata_size= codecdata_length;
00143             st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00144             for(i = 0; i < codecdata_length; i++)
00145                 ((uint8_t*)st->codec->extradata)[i] = get_byte(pb);
00146             rm->audio_framesize = st->codec->block_align;
00147             st->codec->block_align = rm->sub_packet_size;
00148 
00149             if(rm->audio_framesize >= UINT_MAX / sub_packet_h){
00150                 av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
00151                 return -1;
00152             }
00153 
00154             rm->audiobuf = av_malloc(rm->audio_framesize * sub_packet_h);
00155         } else if (!strcmp(buf, "raac") || !strcmp(buf, "racp")) {
00156             int codecdata_length, i;
00157             get_be16(pb); get_byte(pb);
00158             if (((version >> 16) & 0xff) == 5)
00159                 get_byte(pb);
00160             st->codec->codec_id = CODEC_ID_AAC;
00161             codecdata_length = get_be32(pb);
00162             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
00163                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
00164                 return -1;
00165             }
00166             if (codecdata_length >= 1) {
00167                 st->codec->extradata_size = codecdata_length - 1;
00168                 st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00169                 get_byte(pb);
00170                 for(i = 0; i < st->codec->extradata_size; i++)
00171                     ((uint8_t*)st->codec->extradata)[i] = get_byte(pb);
00172             }
00173         } else {
00174             st->codec->codec_id = CODEC_ID_NONE;
00175             av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));
00176         }
00177         if (read_all) {
00178             get_byte(pb);
00179             get_byte(pb);
00180             get_byte(pb);
00181 
00182             get_str8(pb, s->title, sizeof(s->title));
00183             get_str8(pb, s->author, sizeof(s->author));
00184             get_str8(pb, s->copyright, sizeof(s->copyright));
00185             get_str8(pb, s->comment, sizeof(s->comment));
00186         }
00187     }
00188     return 0;
00189 }
00190 
00191 static int
00192 ff_rm_read_mdpr_codecdata (AVFormatContext *s, AVStream *st)
00193 {
00194     ByteIOContext *pb = &s->pb;
00195     unsigned int v;
00196     int codec_data_size, size;
00197     int64_t codec_pos;
00198 
00199     codec_data_size = get_be32(pb);
00200     codec_pos = url_ftell(pb);
00201     v = get_be32(pb);
00202     if (v == MKTAG(0xfd, 'a', 'r', '.')) {
00203         /* ra type header */
00204         if (rm_read_audio_stream_info(s, st, 0))
00205             return -1;
00206     } else {
00207         int fps, fps2;
00208         if (get_le32(pb) != MKTAG('V', 'I', 'D', 'O')) {
00209         fail1:
00210             av_log(st->codec, AV_LOG_ERROR, "Unsupported video codec\n");
00211             goto skip;
00212         }
00213         st->codec->codec_tag = get_le32(pb);
00214 //        av_log(NULL, AV_LOG_DEBUG, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));
00215         if (   st->codec->codec_tag != MKTAG('R', 'V', '1', '0')
00216             && st->codec->codec_tag != MKTAG('R', 'V', '2', '0')
00217             && st->codec->codec_tag != MKTAG('R', 'V', '3', '0')
00218             && st->codec->codec_tag != MKTAG('R', 'V', '4', '0'))
00219             goto fail1;
00220         st->codec->width = get_be16(pb);
00221         st->codec->height = get_be16(pb);
00222         st->codec->time_base.num= 1;
00223         fps= get_be16(pb);
00224         st->codec->codec_type = CODEC_TYPE_VIDEO;
00225         get_be32(pb);
00226         fps2= get_be16(pb);
00227         get_be16(pb);
00228 
00229         st->codec->extradata_size= codec_data_size - (url_ftell(pb) - codec_pos);
00230 
00231         if(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){
00232             //check is redundant as get_buffer() will catch this
00233             av_log(s, AV_LOG_ERROR, "st->codec->extradata_size too large\n");
00234             return -1;
00235         }
00236         st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00237         get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
00238 
00239 //        av_log(NULL, AV_LOG_DEBUG, "fps= %d fps2= %d\n", fps, fps2);
00240         st->codec->time_base.den = fps * st->codec->time_base.num;
00241         switch(((uint8_t*)st->codec->extradata)[4]>>4){
00242         case 1: st->codec->codec_id = CODEC_ID_RV10; break;
00243         case 2: st->codec->codec_id = CODEC_ID_RV20; break;
00244         case 3: st->codec->codec_id = CODEC_ID_RV30; break;
00245         case 4: st->codec->codec_id = CODEC_ID_RV40; break;
00246         default: goto fail1;
00247         }
00248     }
00249 
00250 skip:
00251     /* skip codec info */
00252     size = url_ftell(pb) - codec_pos;
00253     url_fskip(pb, codec_data_size - size);
00254 
00255     return 0;
00256 }
00257 
00258 
00259 static int rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap)
00260 {
00261     RMContext *rm = s->priv_data;
00262     AVStream *st;
00263 
00264     rm->old_format = 1;
00265     st = av_new_stream(s, 0);
00266     if (!st)
00267         return -1;
00268     return rm_read_audio_stream_info(s, st, 1);
00269 }
00270 
00271 static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
00272 {
00273     RMContext *rm = s->priv_data;
00274     AVStream *st;
00275     ByteIOContext *pb = &s->pb;
00276     unsigned int tag;
00277     int tag_size, i;
00278     unsigned int start_time, duration;
00279     char buf[128];
00280     int flags = 0;
00281 
00282     tag = get_le32(pb);
00283     if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
00284         /* very old .ra format */
00285         return rm_read_header_old(s, ap);
00286     } else if (tag != MKTAG('.', 'R', 'M', 'F')) {
00287         return AVERROR(EIO);
00288     }
00289 
00290     get_be32(pb); /* header size */
00291     get_be16(pb);
00292     get_be32(pb);
00293     get_be32(pb); /* number of headers */
00294 
00295     for(;;) {
00296         if (url_feof(pb))
00297             goto fail;
00298         tag = get_le32(pb);
00299         tag_size = get_be32(pb);
00300         get_be16(pb);
00301 #if 0
00302         printf("tag=%c%c%c%c (%08x) size=%d\n",
00303                (tag) & 0xff,
00304                (tag >> 8) & 0xff,
00305                (tag >> 16) & 0xff,
00306                (tag >> 24) & 0xff,
00307                tag,
00308                tag_size);
00309 #endif
00310         if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
00311             goto fail;
00312         switch(tag) {
00313         case MKTAG('P', 'R', 'O', 'P'):
00314             /* file header */
00315             get_be32(pb); /* max bit rate */
00316             get_be32(pb); /* avg bit rate */
00317             get_be32(pb); /* max packet size */
00318             get_be32(pb); /* avg packet size */
00319             get_be32(pb); /* nb packets */
00320             get_be32(pb); /* duration */
00321             get_be32(pb); /* preroll */
00322             get_be32(pb); /* index offset */
00323             get_be32(pb); /* data offset */
00324             get_be16(pb); /* nb streams */
00325             flags = get_be16(pb); /* flags */
00326             break;
00327         case MKTAG('C', 'O', 'N', 'T'):
00328             get_str16(pb, s->title, sizeof(s->title));
00329             get_str16(pb, s->author, sizeof(s->author));
00330             get_str16(pb, s->copyright, sizeof(s->copyright));
00331             get_str16(pb, s->comment, sizeof(s->comment));
00332             break;
00333         case MKTAG('M', 'D', 'P', 'R'):
00334             st = av_new_stream(s, 0);
00335             if (!st)
00336                 goto fail;
00337             st->id = get_be16(pb);
00338             get_be32(pb); /* max bit rate */
00339             st->codec->bit_rate = get_be32(pb); /* bit rate */
00340             get_be32(pb); /* max packet size */
00341             get_be32(pb); /* avg packet size */
00342             start_time = get_be32(pb); /* start time */
00343             get_be32(pb); /* preroll */
00344             duration = get_be32(pb); /* duration */
00345             st->start_time = start_time;
00346             st->duration = duration;
00347             get_str8(pb, buf, sizeof(buf)); /* desc */
00348             get_str8(pb, buf, sizeof(buf)); /* mimetype */
00349             st->codec->codec_type = CODEC_TYPE_DATA;
00350             av_set_pts_info(st, 64, 1, 1000);
00351             if (ff_rm_read_mdpr_codecdata(s, st) < 0)
00352                 return -1;
00353             break;
00354         case MKTAG('D', 'A', 'T', 'A'):
00355             goto header_end;
00356         default:
00357             /* unknown tag: skip it */
00358             url_fskip(pb, tag_size - 10);
00359             break;
00360         }
00361     }
00362  header_end:
00363     rm->nb_packets = get_be32(pb); /* number of packets */
00364     if (!rm->nb_packets && (flags & 4))
00365         rm->nb_packets = 3600 * 25;
00366     get_be32(pb); /* next data header */
00367     rm->curpic_num = -1;
00368     return 0;
00369 
00370  fail:
00371     for(i=0;i<s->nb_streams;i++) {
00372         av_free(s->streams[i]);
00373     }
00374     return AVERROR(EIO);
00375 }
00376 
00377 static int get_num(ByteIOContext *pb, int *len)
00378 {
00379     int n, n1;
00380 
00381     n = get_be16(pb);
00382     (*len)-=2;
00383 //    n &= 0x7FFF;
00384     if (n >= 0x4000) {
00385         return n - 0x4000;
00386     } else {
00387         n1 = get_be16(pb);
00388         (*len)-=2;
00389         return (n << 16) | n1;
00390     }
00391 }
00392 
00393 /* multiple of 20 bytes for ra144 (ugly) */
00394 #define RAW_PACKET_SIZE 1000
00395 
00396 static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
00397     RMContext *rm = s->priv_data;
00398     ByteIOContext *pb = &s->pb;
00399     int len, num, res, i;
00400     AVStream *st;
00401     uint32_t state=0xFFFFFFFF;
00402 
00403     while(!url_feof(pb)){
00404         *pos= url_ftell(pb);
00405         if(rm->remaining_len > 0){
00406             num= rm->current_stream;
00407             len= rm->remaining_len;
00408             *timestamp = AV_NOPTS_VALUE;
00409             *flags= 0;
00410         }else{
00411             state= (state<<8) + get_byte(pb);
00412 
00413             if(state == MKBETAG('I', 'N', 'D', 'X')){
00414                 len = get_be16(pb) - 6;
00415                 if(len<0)
00416                     continue;
00417                 goto skip;
00418             }
00419 
00420             if(state > (unsigned)0xFFFF || state < 12)
00421                 continue;
00422             len=state;
00423             state= 0xFFFFFFFF;
00424 
00425             num = get_be16(pb);
00426             *timestamp = get_be32(pb);
00427             res= get_byte(pb); /* reserved */
00428             *flags = get_byte(pb); /* flags */
00429 
00430 
00431             len -= 12;
00432         }
00433         for(i=0;i<s->nb_streams;i++) {
00434             st = s->streams[i];
00435             if (num == st->id)
00436                 break;
00437         }
00438         if (i == s->nb_streams) {
00439 skip:
00440             /* skip packet if unknown number */
00441             url_fskip(pb, len);
00442             rm->remaining_len -= len;
00443             continue;
00444         }
00445         *stream_index= i;
00446 
00447         return len;
00448     }
00449     return -1;
00450 }
00451 
00452 static int rm_assemble_video_frame(AVFormatContext *s, RMContext *rm, AVPacket *pkt, int len)
00453 {
00454     ByteIOContext *pb = &s->pb;
00455     int hdr, seq, pic_num, len2, pos;
00456     int type;
00457     int ssize;
00458 
00459     hdr = get_byte(pb); len--;
00460     type = hdr >> 6;
00461     switch(type){
00462     case 0: // slice
00463     case 2: // last slice
00464         seq = get_byte(pb); len--;
00465         len2 = get_num(pb, &len);
00466         pos = get_num(pb, &len);
00467         pic_num = get_byte(pb); len--;
00468         rm->remaining_len = len;
00469         break;
00470     case 1: //whole frame
00471         seq = get_byte(pb); len--;
00472         if(av_new_packet(pkt, len + 9) < 0)
00473             return AVERROR(EIO);
00474         pkt->data[0] = 0;
00475         AV_WL32(pkt->data + 1, 1);
00476         AV_WL32(pkt->data + 5, 0);
00477         get_buffer(pb, pkt->data + 9, len);
00478         rm->remaining_len = 0;
00479         return 0;
00480     case 3: //frame as a part of packet
00481         len2 = get_num(pb, &len);
00482         pos = get_num(pb, &len);
00483         pic_num = get_byte(pb); len--;
00484         rm->remaining_len = len - len2;
00485         if(av_new_packet(pkt, len2 + 9) < 0)
00486             return AVERROR(EIO);
00487         pkt->data[0] = 0;
00488         AV_WL32(pkt->data + 1, 1);
00489         AV_WL32(pkt->data + 5, 0);
00490         get_buffer(pb, pkt->data + 9, len2);
00491         return 0;
00492     }
00493     //now we have to deal with single slice
00494 
00495     if((seq & 0x7F) == 1 || rm->curpic_num != pic_num){
00496         rm->slices = ((hdr & 0x3F) << 1) + 1;
00497         ssize = len2 + 8*rm->slices + 1;
00498         rm->videobuf = av_realloc(rm->videobuf, ssize);
00499         rm->videobufsize = ssize;
00500         rm->videobufpos = 8*rm->slices + 1;
00501         rm->cur_slice = 0;
00502         rm->curpic_num = pic_num;
00503         rm->pktpos = url_ftell(pb);
00504     }
00505     if(type == 2){
00506         len = FFMIN(len, pos);
00507         pos = len2 - pos;
00508     }
00509 
00510     if(++rm->cur_slice > rm->slices)
00511         return 1;
00512     AV_WL32(rm->videobuf - 7 + 8*rm->cur_slice, 1);
00513     AV_WL32(rm->videobuf - 3 + 8*rm->cur_slice, rm->videobufpos - 8*rm->slices - 1);
00514     if(rm->videobufpos + len > rm->videobufsize)
00515         return 1;
00516     if (get_buffer(pb, rm->videobuf + rm->videobufpos, len) != len)
00517         return AVERROR(EIO);
00518     rm->videobufpos += len,
00519     rm->remaining_len-= len;
00520 
00521     if(type == 2 || (rm->videobufpos) == rm->videobufsize){
00522          //adjust slice headers
00523          memmove(rm->videobuf + 1 + 8*rm->cur_slice, rm->videobuf + 1 + 8*rm->slices, rm->videobufsize - 1 - 8*rm->slices);
00524          ssize = rm->videobufsize - 8*(rm->slices - rm->cur_slice);
00525 
00526          rm->videobuf[0] = rm->cur_slice-1;
00527          if(av_new_packet(pkt, ssize) < 0)
00528              return AVERROR(ENOMEM);
00529          memcpy(pkt->data, rm->videobuf, ssize);
00530          pkt->pts = AV_NOPTS_VALUE;
00531          pkt->pos = rm->pktpos;
00532          return 0;
00533     }
00534 
00535     return 1;
00536 }
00537 
00538 static inline void
00539 rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt)
00540 {
00541     uint8_t *ptr;
00542     int j;
00543 
00544     if (st->codec->codec_id == CODEC_ID_AC3) {
00545         ptr = pkt->data;
00546         for (j=0;j<pkt->size;j+=2) {
00547             FFSWAP(int, ptr[0], ptr[1]);
00548             ptr += 2;
00549         }
00550     }
00551 }
00552 
00553 static int
00554 ff_rm_parse_packet (AVFormatContext *s, AVStream *st, int len, AVPacket *pkt,
00555                     int *seq, int *flags, int64_t *timestamp)
00556 {
00557     ByteIOContext *pb = &s->pb;
00558     RMContext *rm = s->priv_data;
00559 
00560     if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
00561         rm->current_stream= st->id;
00562         if(rm_assemble_video_frame(s, rm, pkt, len) == 1)
00563             return -1; //got partial frame
00564     } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
00565         if ((st->codec->codec_id == CODEC_ID_RA_288) ||
00566             (st->codec->codec_id == CODEC_ID_COOK) ||
00567             (st->codec->codec_id == CODEC_ID_ATRAC3)) {
00568             int x;
00569             int sps = rm->sub_packet_size;
00570             int cfs = rm->coded_framesize;
00571             int h = rm->sub_packet_h;
00572             int y = rm->sub_packet_cnt;
00573             int w = rm->audio_framesize;
00574 
00575             if (*flags & 2)
00576                 y = rm->sub_packet_cnt = 0;
00577             if (!y)
00578                 rm->audiotimestamp = *timestamp;
00579 
00580             switch(st->codec->codec_id) {
00581                 case CODEC_ID_RA_288:
00582                     for (x = 0; x < h/2; x++)
00583                         get_buffer(pb, rm->audiobuf+x*2*w+y*cfs, cfs);
00584                     break;
00585                 case CODEC_ID_ATRAC3:
00586                 case CODEC_ID_COOK:
00587                     for (x = 0; x < w/sps; x++)
00588                         get_buffer(pb, rm->audiobuf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
00589                     break;
00590             }
00591 
00592             if (++(rm->sub_packet_cnt) < h)
00593                 return -1;
00594             else {
00595                 rm->sub_packet_cnt = 0;
00596                 rm->audio_stream_num = st->index;
00597                 rm->audio_pkt_cnt = h * w / st->codec->block_align - 1;
00598                 // Release first audio packet
00599                 av_new_packet(pkt, st->codec->block_align);
00600                 memcpy(pkt->data, rm->audiobuf, st->codec->block_align);
00601                 *timestamp = rm->audiotimestamp;
00602                 *flags = 2; // Mark first packet as keyframe
00603             }
00604         } else if (st->codec->codec_id == CODEC_ID_AAC) {
00605             int x;
00606             rm->audio_stream_num = st->index;
00607             rm->sub_packet_cnt = (get_be16(pb) & 0xf0) >> 4;
00608             if (rm->sub_packet_cnt) {
00609                 for (x = 0; x < rm->sub_packet_cnt; x++)
00610                     rm->sub_packet_lengths[x] = get_be16(pb);
00611                 // Release first audio packet
00612                 rm->audio_pkt_cnt = rm->sub_packet_cnt - 1;
00613                 av_get_packet(pb, pkt, rm->sub_packet_lengths[0]);
00614                 *flags = 2; // Mark first packet as keyframe
00615             }
00616         } else
00617             av_get_packet(pb, pkt, len);
00618             rm_ac3_swap_bytes(st, pkt);
00619 
00620     } else
00621         av_get_packet(pb, pkt, len);
00622 
00623     if(  (st->discard >= AVDISCARD_NONKEY && !(*flags&2))
00624        || st->discard >= AVDISCARD_ALL){
00625         av_free_packet(pkt);
00626         return -1;
00627     }
00628 
00629     pkt->stream_index = st->index;
00630 
00631 #if 0
00632     if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
00633         if(st->codec->codec_id == CODEC_ID_RV20){
00634             int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
00635             av_log(NULL, AV_LOG_DEBUG, "%d %"PRId64" %d\n", *timestamp, *timestamp*512LL/25, seq);
00636 
00637             seq |= (*timestamp&~0x3FFF);
00638             if(seq - *timestamp >  0x2000) seq -= 0x4000;
00639             if(seq - *timestamp < -0x2000) seq += 0x4000;
00640         }
00641     }
00642 #endif
00643 
00644     pkt->pts= *timestamp;
00645     if (*flags & 2)
00646         pkt->flags |= PKT_FLAG_KEY;
00647 
00648     return 0;
00649 }
00650 
00651 static void
00652 ff_rm_retrieve_cache (AVFormatContext *s, AVStream *st, AVPacket *pkt)
00653 {
00654     ByteIOContext *pb = &s->pb;
00655     RMContext *rm = s->priv_data;
00656 
00657     assert (rm->audio_pkt_cnt > 0);
00658 
00659     if (st->codec->codec_id == CODEC_ID_AAC)
00660         av_get_packet(pb, pkt, rm->sub_packet_lengths[rm->sub_packet_cnt - rm->audio_pkt_cnt]);
00661     else {
00662         av_new_packet(pkt, st->codec->block_align);
00663         memcpy(pkt->data, rm->audiobuf + st->codec->block_align *
00664                (rm->sub_packet_h * rm->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
00665                st->codec->block_align);
00666     }
00667     rm->audio_pkt_cnt--;
00668     pkt->flags = 0;
00669     pkt->stream_index = st->index;
00670 }
00671 
00672 static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
00673 {
00674     RMContext *rm = s->priv_data;
00675     ByteIOContext *pb = &s->pb;
00676     AVStream *st;
00677     int i, len;
00678     int64_t timestamp, pos;
00679     int flags;
00680 
00681     if (rm->audio_pkt_cnt) {
00682         // If there are queued audio packet return them first
00683         st = s->streams[rm->audio_stream_num];
00684         ff_rm_retrieve_cache(s, st, pkt);
00685     } else if (rm->old_format) {
00686         st = s->streams[0];
00687         if (st->codec->codec_id == CODEC_ID_RA_288) {
00688             int x, y;
00689 
00690             for (y = 0; y < rm->sub_packet_h; y++)
00691                 for (x = 0; x < rm->sub_packet_h/2; x++)
00692                     if (get_buffer(pb, rm->audiobuf+x*2*rm->audio_framesize+y*rm->coded_framesize, rm->coded_framesize) <= 0)
00693                         return AVERROR(EIO);
00694             rm->audio_stream_num = 0;
00695             rm->audio_pkt_cnt = rm->sub_packet_h * rm->audio_framesize / st->codec->block_align - 1;
00696             // Release first audio packet
00697             av_new_packet(pkt, st->codec->block_align);
00698             memcpy(pkt->data, rm->audiobuf, st->codec->block_align);
00699             pkt->flags |= PKT_FLAG_KEY; // Mark first packet as keyframe
00700             pkt->stream_index = 0;
00701         } else {
00702             /* just read raw bytes */
00703             len = RAW_PACKET_SIZE;
00704             len= av_get_packet(pb, pkt, len);
00705             pkt->stream_index = 0;
00706             if (len <= 0) {
00707                 return AVERROR(EIO);
00708             }
00709             pkt->size = len;
00710         }
00711         rm_ac3_swap_bytes(st, pkt);
00712     } else {
00713         int seq=1;
00714 resync:
00715         len=sync(s, &timestamp, &flags, &i, &pos);
00716         if(len<0)
00717             return AVERROR(EIO);
00718         st = s->streams[i];
00719 
00720         if (ff_rm_parse_packet (s, st, len, pkt, &seq, &flags, &timestamp) < 0)
00721             goto resync;
00722 
00723         if(flags&2){
00724             if((seq&0x7F) == 1)
00725                 av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
00726         }
00727     }
00728 
00729     return 0;
00730 }
00731 
00732 static int rm_read_close(AVFormatContext *s)
00733 {
00734     RMContext *rm = s->priv_data;
00735 
00736     av_free(rm->audiobuf);
00737     av_free(rm->videobuf);
00738     return 0;
00739 }
00740 
00741 static int rm_probe(AVProbeData *p)
00742 {
00743     /* check file header */
00744     if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
00745          p->buf[2] == 'M' && p->buf[3] == 'F' &&
00746          p->buf[4] == 0 && p->buf[5] == 0) ||
00747         (p->buf[0] == '.' && p->buf[1] == 'r' &&
00748          p->buf[2] == 'a' && p->buf[3] == 0xfd))
00749         return AVPROBE_SCORE_MAX;
00750     else
00751         return 0;
00752 }
00753 
00754 static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
00755                                int64_t *ppos, int64_t pos_limit)
00756 {
00757     RMContext *rm = s->priv_data;
00758     int64_t pos, dts;
00759     int stream_index2, flags, len, h;
00760 
00761     pos = *ppos;
00762 
00763     if(rm->old_format)
00764         return AV_NOPTS_VALUE;
00765 
00766     url_fseek(&s->pb, pos, SEEK_SET);
00767     rm->remaining_len=0;
00768     for(;;){
00769         int seq=1;
00770         AVStream *st;
00771 
00772         len=sync(s, &dts, &flags, &stream_index2, &pos);
00773         if(len<0)
00774             return AV_NOPTS_VALUE;
00775 
00776         st = s->streams[stream_index2];
00777         if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
00778             h= get_byte(&s->pb); len--;
00779             if(!(h & 0x40)){
00780                 seq = get_byte(&s->pb); len--;
00781             }
00782         }
00783 
00784         if((flags&2) && (seq&0x7F) == 1){
00785 //            av_log(s, AV_LOG_DEBUG, "%d %d-%d %"PRId64" %d\n", flags, stream_index2, stream_index, dts, seq);
00786             av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);
00787             if(stream_index2 == stream_index)
00788                 break;
00789         }
00790 
00791         url_fskip(&s->pb, len);
00792     }
00793     *ppos = pos;
00794     return dts;
00795 }
00796 
00797 AVInputFormat rm_demuxer = {
00798     "rm",
00799     "rm format",
00800     sizeof(RMContext),
00801     rm_probe,
00802     rm_read_header,
00803     rm_read_packet,
00804     rm_read_close,
00805     NULL,
00806     rm_read_dts,
00807 };