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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 Libav.
00006  *
00007  * Libav is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * Libav is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with Libav; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #include "libavutil/avstring.h"
00023 #include "libavutil/intreadwrite.h"
00024 #include "libavutil/dict.h"
00025 #include "avformat.h"
00026 #include "internal.h"
00027 #include "riff.h"
00028 #include "rm.h"
00029 
00030 #define DEINT_ID_GENR MKTAG('g', 'e', 'n', 'r') ///< interleaving for Cooker/Atrac
00031 #define DEINT_ID_INT0 MKTAG('I', 'n', 't', '0') ///< no interleaving needed
00032 #define DEINT_ID_INT4 MKTAG('I', 'n', 't', '4') ///< interleaving for 28.8
00033 #define DEINT_ID_SIPR MKTAG('s', 'i', 'p', 'r') ///< interleaving for Sipro
00034 #define DEINT_ID_VBRF MKTAG('v', 'b', 'r', 'f') ///< VBR case for AAC
00035 #define DEINT_ID_VBRS MKTAG('v', 'b', 'r', 's') ///< VBR case for AAC
00036 
00037 struct RMStream {
00038     AVPacket pkt;      
00039     int videobufsize;  
00040     int videobufpos;   
00041     int curpic_num;    
00042     int cur_slice, slices;
00043     int64_t pktpos;    
00044 
00045     int64_t audiotimestamp; 
00046     int sub_packet_cnt; // Subpacket counter, used while reading
00047     int sub_packet_size, sub_packet_h, coded_framesize; 
00048     int audio_framesize; 
00049     int sub_packet_lengths[16]; 
00050     int32_t deint_id;  
00051 };
00052 
00053 typedef struct {
00054     int nb_packets;
00055     int old_format;
00056     int current_stream;
00057     int remaining_len;
00058     int audio_stream_num; 
00059     int audio_pkt_cnt; 
00060 } RMDemuxContext;
00061 
00062 static const unsigned char sipr_swaps[38][2] = {
00063     {  0, 63 }, {  1, 22 }, {  2, 44 }, {  3, 90 },
00064     {  5, 81 }, {  7, 31 }, {  8, 86 }, {  9, 58 },
00065     { 10, 36 }, { 12, 68 }, { 13, 39 }, { 14, 73 },
00066     { 15, 53 }, { 16, 69 }, { 17, 57 }, { 19, 88 },
00067     { 20, 34 }, { 21, 71 }, { 24, 46 }, { 25, 94 },
00068     { 26, 54 }, { 28, 75 }, { 29, 50 }, { 32, 70 },
00069     { 33, 92 }, { 35, 74 }, { 38, 85 }, { 40, 56 },
00070     { 42, 87 }, { 43, 65 }, { 45, 59 }, { 48, 79 },
00071     { 49, 93 }, { 51, 89 }, { 55, 95 }, { 61, 76 },
00072     { 67, 83 }, { 77, 80 }
00073 };
00074 
00075 const unsigned char ff_sipr_subpk_size[4] = { 29, 19, 37, 20 };
00076 
00077 static inline void get_strl(AVIOContext *pb, char *buf, int buf_size, int len)
00078 {
00079     int i;
00080     char *q, r;
00081 
00082     q = buf;
00083     for(i=0;i<len;i++) {
00084         r = avio_r8(pb);
00085         if (i < buf_size - 1)
00086             *q++ = r;
00087     }
00088     if (buf_size > 0) *q = '\0';
00089 }
00090 
00091 static void get_str8(AVIOContext *pb, char *buf, int buf_size)
00092 {
00093     get_strl(pb, buf, buf_size, avio_r8(pb));
00094 }
00095 
00096 static int rm_read_extradata(AVIOContext *pb, AVCodecContext *avctx, unsigned size)
00097 {
00098     if (size >= 1<<24)
00099         return -1;
00100     avctx->extradata = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
00101     if (!avctx->extradata)
00102         return AVERROR(ENOMEM);
00103     avctx->extradata_size = avio_read(pb, avctx->extradata, size);
00104     memset(avctx->extradata + avctx->extradata_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
00105     if (avctx->extradata_size != size)
00106         return AVERROR(EIO);
00107     return 0;
00108 }
00109 
00110 static void rm_read_metadata(AVFormatContext *s, int wide)
00111 {
00112     char buf[1024];
00113     int i;
00114     for (i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
00115         int len = wide ? avio_rb16(s->pb) : avio_r8(s->pb);
00116         get_strl(s->pb, buf, sizeof(buf), len);
00117         av_dict_set(&s->metadata, ff_rm_metadata[i], buf, 0);
00118     }
00119 }
00120 
00121 RMStream *ff_rm_alloc_rmstream (void)
00122 {
00123     RMStream *rms = av_mallocz(sizeof(RMStream));
00124     rms->curpic_num = -1;
00125     return rms;
00126 }
00127 
00128 void ff_rm_free_rmstream (RMStream *rms)
00129 {
00130     av_free_packet(&rms->pkt);
00131 }
00132 
00133 static int rm_read_audio_stream_info(AVFormatContext *s, AVIOContext *pb,
00134                                      AVStream *st, RMStream *ast, int read_all)
00135 {
00136     char buf[256];
00137     uint32_t version;
00138     int ret;
00139 
00140     /* ra type header */
00141     version = avio_rb16(pb); /* version */
00142     if (version == 3) {
00143         int header_size = avio_rb16(pb);
00144         int64_t startpos = avio_tell(pb);
00145         avio_skip(pb, 14);
00146         rm_read_metadata(s, 0);
00147         if ((startpos + header_size) >= avio_tell(pb) + 2) {
00148             // fourcc (should always be "lpcJ")
00149             avio_r8(pb);
00150             get_str8(pb, buf, sizeof(buf));
00151         }
00152         // Skip extra header crap (this should never happen)
00153         if ((startpos + header_size) > avio_tell(pb))
00154             avio_skip(pb, header_size + startpos - avio_tell(pb));
00155         st->codec->sample_rate = 8000;
00156         st->codec->channels = 1;
00157         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00158         st->codec->codec_id = CODEC_ID_RA_144;
00159         ast->deint_id = DEINT_ID_INT0;
00160     } else {
00161         int flavor, sub_packet_h, coded_framesize, sub_packet_size;
00162         int codecdata_length;
00163         /* old version (4) */
00164         avio_skip(pb, 2); /* unused */
00165         avio_rb32(pb); /* .ra4 */
00166         avio_rb32(pb); /* data size */
00167         avio_rb16(pb); /* version2 */
00168         avio_rb32(pb); /* header size */
00169         flavor= avio_rb16(pb); /* add codec info / flavor */
00170         ast->coded_framesize = coded_framesize = avio_rb32(pb); /* coded frame size */
00171         avio_rb32(pb); /* ??? */
00172         avio_rb32(pb); /* ??? */
00173         avio_rb32(pb); /* ??? */
00174         ast->sub_packet_h = sub_packet_h = avio_rb16(pb); /* 1 */
00175         st->codec->block_align= avio_rb16(pb); /* frame size */
00176         ast->sub_packet_size = sub_packet_size = avio_rb16(pb); /* sub packet size */
00177         avio_rb16(pb); /* ??? */
00178         if (version == 5) {
00179             avio_rb16(pb); avio_rb16(pb); avio_rb16(pb);
00180         }
00181         st->codec->sample_rate = avio_rb16(pb);
00182         avio_rb32(pb);
00183         st->codec->channels = avio_rb16(pb);
00184         if (version == 5) {
00185             ast->deint_id = avio_rl32(pb);
00186             avio_read(pb, buf, 4);
00187             buf[4] = 0;
00188         } else {
00189             get_str8(pb, buf, sizeof(buf)); /* desc */
00190             ast->deint_id = AV_RL32(buf);
00191             get_str8(pb, buf, sizeof(buf)); /* desc */
00192         }
00193         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00194         st->codec->codec_tag  = AV_RL32(buf);
00195         st->codec->codec_id   = ff_codec_get_id(ff_rm_codec_tags,
00196                                                 st->codec->codec_tag);
00197 
00198         switch (st->codec->codec_id) {
00199         case CODEC_ID_AC3:
00200             st->need_parsing = AVSTREAM_PARSE_FULL;
00201             break;
00202         case CODEC_ID_RA_288:
00203             st->codec->extradata_size= 0;
00204             ast->audio_framesize = st->codec->block_align;
00205             st->codec->block_align = coded_framesize;
00206             break;
00207         case CODEC_ID_COOK:
00208         case CODEC_ID_ATRAC3:
00209         case CODEC_ID_SIPR:
00210             avio_rb16(pb); avio_r8(pb);
00211             if (version == 5)
00212                 avio_r8(pb);
00213             codecdata_length = avio_rb32(pb);
00214             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
00215                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
00216                 return -1;
00217             }
00218 
00219             ast->audio_framesize = st->codec->block_align;
00220             if (st->codec->codec_id == CODEC_ID_SIPR) {
00221                 if (flavor > 3) {
00222                     av_log(s, AV_LOG_ERROR, "bad SIPR file flavor %d\n",
00223                            flavor);
00224                     return -1;
00225                 }
00226                 st->codec->block_align = ff_sipr_subpk_size[flavor];
00227             } else {
00228                 if(sub_packet_size <= 0){
00229                     av_log(s, AV_LOG_ERROR, "sub_packet_size is invalid\n");
00230                     return -1;
00231                 }
00232                 st->codec->block_align = ast->sub_packet_size;
00233             }
00234             if ((ret = rm_read_extradata(pb, st->codec, codecdata_length)) < 0)
00235                 return ret;
00236             break;
00237         case CODEC_ID_AAC:
00238             avio_rb16(pb); avio_r8(pb);
00239             if (version == 5)
00240                 avio_r8(pb);
00241             codecdata_length = avio_rb32(pb);
00242             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
00243                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
00244                 return -1;
00245             }
00246             if (codecdata_length >= 1) {
00247                 avio_r8(pb);
00248                 if ((ret = rm_read_extradata(pb, st->codec, codecdata_length - 1)) < 0)
00249                     return ret;
00250             }
00251             break;
00252         default:
00253             av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));
00254         }
00255         if (ast->deint_id == DEINT_ID_INT4 ||
00256             ast->deint_id == DEINT_ID_GENR ||
00257             ast->deint_id == DEINT_ID_SIPR) {
00258             if (st->codec->block_align <= 0 ||
00259                 ast->audio_framesize * sub_packet_h > (unsigned)INT_MAX ||
00260                 ast->audio_framesize * sub_packet_h < st->codec->block_align)
00261                 return AVERROR_INVALIDDATA;
00262             if (av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h) < 0)
00263                 return AVERROR(ENOMEM);
00264         }
00265         switch (ast->deint_id) {
00266         case DEINT_ID_INT4:
00267             if (ast->coded_framesize > ast->audio_framesize ||
00268                 sub_packet_h <= 1 ||
00269                 ast->coded_framesize * sub_packet_h > (2 + (sub_packet_h & 1)) * ast->audio_framesize)
00270                 return AVERROR_INVALIDDATA;
00271             break;
00272         case DEINT_ID_GENR:
00273             if (ast->sub_packet_size <= 0 ||
00274                 ast->sub_packet_size > ast->audio_framesize)
00275                 return AVERROR_INVALIDDATA;
00276             break;
00277         case DEINT_ID_SIPR:
00278         case DEINT_ID_INT0:
00279         case DEINT_ID_VBRS:
00280         case DEINT_ID_VBRF:
00281             break;
00282         default:
00283             av_log(NULL,0,"Unknown interleaver %X\n", ast->deint_id);
00284             return AVERROR_INVALIDDATA;
00285         }
00286 
00287         if (read_all) {
00288             avio_r8(pb);
00289             avio_r8(pb);
00290             avio_r8(pb);
00291             rm_read_metadata(s, 0);
00292         }
00293     }
00294     return 0;
00295 }
00296 
00297 int
00298 ff_rm_read_mdpr_codecdata (AVFormatContext *s, AVIOContext *pb,
00299                            AVStream *st, RMStream *rst, int codec_data_size)
00300 {
00301     unsigned int v;
00302     int size;
00303     int64_t codec_pos;
00304     int ret;
00305 
00306     avpriv_set_pts_info(st, 64, 1, 1000);
00307     codec_pos = avio_tell(pb);
00308     v = avio_rb32(pb);
00309     if (v == MKTAG(0xfd, 'a', 'r', '.')) {
00310         /* ra type header */
00311         if (rm_read_audio_stream_info(s, pb, st, rst, 0))
00312             return -1;
00313     } else {
00314         int fps;
00315         if (avio_rl32(pb) != MKTAG('V', 'I', 'D', 'O')) {
00316         fail1:
00317             av_log(st->codec, AV_LOG_ERROR, "Unsupported video codec\n");
00318             goto skip;
00319         }
00320         st->codec->codec_tag = avio_rl32(pb);
00321         st->codec->codec_id  = ff_codec_get_id(ff_rm_codec_tags,
00322                                                st->codec->codec_tag);
00323 //        av_log(s, AV_LOG_DEBUG, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));
00324         if (st->codec->codec_id == CODEC_ID_NONE)
00325             goto fail1;
00326         st->codec->width  = avio_rb16(pb);
00327         st->codec->height = avio_rb16(pb);
00328         avio_skip(pb, 2); // looks like bits per sample
00329         avio_skip(pb, 4); // always zero?
00330         st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00331         st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
00332         fps = avio_rb32(pb);
00333 
00334         if ((ret = rm_read_extradata(pb, st->codec, codec_data_size - (avio_tell(pb) - codec_pos))) < 0)
00335             return ret;
00336 
00337         av_reduce(&st->r_frame_rate.den, &st->r_frame_rate.num,
00338                   0x10000, fps, (1 << 30) - 1);
00339         st->avg_frame_rate = st->r_frame_rate;
00340     }
00341 
00342 skip:
00343     /* skip codec info */
00344     size = avio_tell(pb) - codec_pos;
00345     avio_skip(pb, codec_data_size - size);
00346 
00347     return 0;
00348 }
00349 
00352 static int rm_read_index(AVFormatContext *s)
00353 {
00354     AVIOContext *pb = s->pb;
00355     unsigned int size, n_pkts, str_id, next_off, n, pos, pts;
00356     AVStream *st;
00357 
00358     do {
00359         if (avio_rl32(pb) != MKTAG('I','N','D','X'))
00360             return -1;
00361         size     = avio_rb32(pb);
00362         if (size < 20)
00363             return -1;
00364         avio_skip(pb, 2);
00365         n_pkts   = avio_rb32(pb);
00366         str_id   = avio_rb16(pb);
00367         next_off = avio_rb32(pb);
00368         for (n = 0; n < s->nb_streams; n++)
00369             if (s->streams[n]->id == str_id) {
00370                 st = s->streams[n];
00371                 break;
00372             }
00373         if (n == s->nb_streams) {
00374             av_log(s, AV_LOG_ERROR,
00375                    "Invalid stream index %d for index at pos %"PRId64"\n",
00376                    str_id, avio_tell(pb));
00377             goto skip;
00378         } else if ((avio_size(pb) - avio_tell(pb)) / 14 < n_pkts) {
00379             av_log(s, AV_LOG_ERROR,
00380                    "Nr. of packets in packet index for stream index %d "
00381                    "exceeds filesize (%"PRId64" at %"PRId64" = %d)\n",
00382                    str_id, avio_size(pb), avio_tell(pb),
00383                    (avio_size(pb) - avio_tell(pb)) / 14);
00384             goto skip;
00385         }
00386 
00387         for (n = 0; n < n_pkts; n++) {
00388             avio_skip(pb, 2);
00389             pts = avio_rb32(pb);
00390             pos = avio_rb32(pb);
00391             avio_skip(pb, 4); /* packet no. */
00392 
00393             av_add_index_entry(st, pos, pts, 0, 0, AVINDEX_KEYFRAME);
00394         }
00395 
00396 skip:
00397         if (next_off && avio_tell(pb) < next_off &&
00398             avio_seek(pb, next_off, SEEK_SET) < 0) {
00399             av_log(s, AV_LOG_ERROR,
00400                    "Non-linear index detected, not supported\n");
00401             return -1;
00402         }
00403     } while (next_off);
00404 
00405     return 0;
00406 }
00407 
00408 static int rm_read_header_old(AVFormatContext *s)
00409 {
00410     RMDemuxContext *rm = s->priv_data;
00411     AVStream *st;
00412 
00413     rm->old_format = 1;
00414     st = avformat_new_stream(s, NULL);
00415     if (!st)
00416         return -1;
00417     st->priv_data = ff_rm_alloc_rmstream();
00418     return rm_read_audio_stream_info(s, s->pb, st, st->priv_data, 1);
00419 }
00420 
00421 static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
00422 {
00423     RMDemuxContext *rm = s->priv_data;
00424     AVStream *st;
00425     AVIOContext *pb = s->pb;
00426     unsigned int tag;
00427     int tag_size;
00428     unsigned int start_time, duration;
00429     unsigned int data_off = 0, indx_off = 0;
00430     char buf[128];
00431     int flags = 0;
00432 
00433     tag = avio_rl32(pb);
00434     if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
00435         /* very old .ra format */
00436         return rm_read_header_old(s);
00437     } else if (tag != MKTAG('.', 'R', 'M', 'F')) {
00438         return AVERROR(EIO);
00439     }
00440 
00441     avio_rb32(pb); /* header size */
00442     avio_rb16(pb);
00443     avio_rb32(pb);
00444     avio_rb32(pb); /* number of headers */
00445 
00446     for(;;) {
00447         if (pb->eof_reached)
00448             return -1;
00449         tag = avio_rl32(pb);
00450         tag_size = avio_rb32(pb);
00451         avio_rb16(pb);
00452         av_dlog(s, "tag=%c%c%c%c (%08x) size=%d\n",
00453                 (tag      ) & 0xff,
00454                 (tag >>  8) & 0xff,
00455                 (tag >> 16) & 0xff,
00456                 (tag >> 24) & 0xff,
00457                 tag,
00458                 tag_size);
00459         if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
00460             return -1;
00461         switch(tag) {
00462         case MKTAG('P', 'R', 'O', 'P'):
00463             /* file header */
00464             avio_rb32(pb); /* max bit rate */
00465             avio_rb32(pb); /* avg bit rate */
00466             avio_rb32(pb); /* max packet size */
00467             avio_rb32(pb); /* avg packet size */
00468             avio_rb32(pb); /* nb packets */
00469             avio_rb32(pb); /* duration */
00470             avio_rb32(pb); /* preroll */
00471             indx_off = avio_rb32(pb); /* index offset */
00472             data_off = avio_rb32(pb); /* data offset */
00473             avio_rb16(pb); /* nb streams */
00474             flags = avio_rb16(pb); /* flags */
00475             break;
00476         case MKTAG('C', 'O', 'N', 'T'):
00477             rm_read_metadata(s, 1);
00478             break;
00479         case MKTAG('M', 'D', 'P', 'R'):
00480             st = avformat_new_stream(s, NULL);
00481             if (!st)
00482                 return AVERROR(ENOMEM);
00483             st->id = avio_rb16(pb);
00484             avio_rb32(pb); /* max bit rate */
00485             st->codec->bit_rate = avio_rb32(pb); /* bit rate */
00486             avio_rb32(pb); /* max packet size */
00487             avio_rb32(pb); /* avg packet size */
00488             start_time = avio_rb32(pb); /* start time */
00489             avio_rb32(pb); /* preroll */
00490             duration = avio_rb32(pb); /* duration */
00491             st->start_time = start_time;
00492             st->duration = duration;
00493             get_str8(pb, buf, sizeof(buf)); /* desc */
00494             get_str8(pb, buf, sizeof(buf)); /* mimetype */
00495             st->codec->codec_type = AVMEDIA_TYPE_DATA;
00496             st->priv_data = ff_rm_alloc_rmstream();
00497             if (ff_rm_read_mdpr_codecdata(s, s->pb, st, st->priv_data,
00498                                           avio_rb32(pb)) < 0)
00499                 return -1;
00500             break;
00501         case MKTAG('D', 'A', 'T', 'A'):
00502             goto header_end;
00503         default:
00504             /* unknown tag: skip it */
00505             avio_skip(pb, tag_size - 10);
00506             break;
00507         }
00508     }
00509  header_end:
00510     rm->nb_packets = avio_rb32(pb); /* number of packets */
00511     if (!rm->nb_packets && (flags & 4))
00512         rm->nb_packets = 3600 * 25;
00513     avio_rb32(pb); /* next data header */
00514 
00515     if (!data_off)
00516         data_off = avio_tell(pb) - 18;
00517     if (indx_off && pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
00518         avio_seek(pb, indx_off, SEEK_SET) >= 0) {
00519         rm_read_index(s);
00520         avio_seek(pb, data_off + 18, SEEK_SET);
00521     }
00522 
00523     return 0;
00524 }
00525 
00526 static int get_num(AVIOContext *pb, int *len)
00527 {
00528     int n, n1;
00529 
00530     n = avio_rb16(pb);
00531     (*len)-=2;
00532     n &= 0x7FFF;
00533     if (n >= 0x4000) {
00534         return n - 0x4000;
00535     } else {
00536         n1 = avio_rb16(pb);
00537         (*len)-=2;
00538         return (n << 16) | n1;
00539     }
00540 }
00541 
00542 /* multiple of 20 bytes for ra144 (ugly) */
00543 #define RAW_PACKET_SIZE 1000
00544 
00545 static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
00546     RMDemuxContext *rm = s->priv_data;
00547     AVIOContext *pb = s->pb;
00548     AVStream *st;
00549     uint32_t state=0xFFFFFFFF;
00550 
00551     while(!pb->eof_reached){
00552         int len, num, i;
00553         *pos= avio_tell(pb) - 3;
00554         if(rm->remaining_len > 0){
00555             num= rm->current_stream;
00556             len= rm->remaining_len;
00557             *timestamp = AV_NOPTS_VALUE;
00558             *flags= 0;
00559         }else{
00560             state= (state<<8) + avio_r8(pb);
00561 
00562             if(state == MKBETAG('I', 'N', 'D', 'X')){
00563                 int n_pkts, expected_len;
00564                 len = avio_rb32(pb);
00565                 avio_skip(pb, 2);
00566                 n_pkts = avio_rb32(pb);
00567                 expected_len = 20 + n_pkts * 14;
00568                 if (len == 20)
00569                     /* some files don't add index entries to chunk size... */
00570                     len = expected_len;
00571                 else if (len != expected_len)
00572                     av_log(s, AV_LOG_WARNING,
00573                            "Index size %d (%d pkts) is wrong, should be %d.\n",
00574                            len, n_pkts, expected_len);
00575                 len -= 14; // we already read part of the index header
00576                 if(len<0)
00577                     continue;
00578                 goto skip;
00579             } else if (state == MKBETAG('D','A','T','A')) {
00580                 av_log(s, AV_LOG_WARNING,
00581                        "DATA tag in middle of chunk, file may be broken.\n");
00582             }
00583 
00584             if(state > (unsigned)0xFFFF || state <= 12)
00585                 continue;
00586             len=state - 12;
00587             state= 0xFFFFFFFF;
00588 
00589             num = avio_rb16(pb);
00590             *timestamp = avio_rb32(pb);
00591             avio_r8(pb); /* reserved */
00592             *flags = avio_r8(pb); /* flags */
00593         }
00594         for(i=0;i<s->nb_streams;i++) {
00595             st = s->streams[i];
00596             if (num == st->id)
00597                 break;
00598         }
00599         if (i == s->nb_streams) {
00600 skip:
00601             /* skip packet if unknown number */
00602             avio_skip(pb, len);
00603             rm->remaining_len = 0;
00604             continue;
00605         }
00606         *stream_index= i;
00607 
00608         return len;
00609     }
00610     return -1;
00611 }
00612 
00613 static int rm_assemble_video_frame(AVFormatContext *s, AVIOContext *pb,
00614                                    RMDemuxContext *rm, RMStream *vst,
00615                                    AVPacket *pkt, int len, int *pseq,
00616                                    int64_t *timestamp)
00617 {
00618     int hdr, seq, pic_num, len2, pos;
00619     int type;
00620 
00621     hdr = avio_r8(pb); len--;
00622     type = hdr >> 6;
00623 
00624     if(type != 3){  // not frame as a part of packet
00625         seq = avio_r8(pb); len--;
00626     }
00627     if(type != 1){  // not whole frame
00628         len2 = get_num(pb, &len);
00629         pos  = get_num(pb, &len);
00630         pic_num = avio_r8(pb); len--;
00631     }
00632     if(len<0)
00633         return -1;
00634     rm->remaining_len = len;
00635     if(type&1){     // frame, not slice
00636         if(type == 3){  // frame as a part of packet
00637             len= len2;
00638             *timestamp = pos;
00639         }
00640         if(rm->remaining_len < len)
00641             return -1;
00642         rm->remaining_len -= len;
00643         if(av_new_packet(pkt, len + 9) < 0)
00644             return AVERROR(EIO);
00645         pkt->data[0] = 0;
00646         AV_WL32(pkt->data + 1, 1);
00647         AV_WL32(pkt->data + 5, 0);
00648         avio_read(pb, pkt->data + 9, len);
00649         return 0;
00650     }
00651     //now we have to deal with single slice
00652 
00653     *pseq = seq;
00654     if((seq & 0x7F) == 1 || vst->curpic_num != pic_num){
00655         vst->slices = ((hdr & 0x3F) << 1) + 1;
00656         vst->videobufsize = len2 + 8*vst->slices + 1;
00657         av_free_packet(&vst->pkt); //FIXME this should be output.
00658         if(av_new_packet(&vst->pkt, vst->videobufsize) < 0)
00659             return AVERROR(ENOMEM);
00660         vst->videobufpos = 8*vst->slices + 1;
00661         vst->cur_slice = 0;
00662         vst->curpic_num = pic_num;
00663         vst->pktpos = avio_tell(pb);
00664     }
00665     if(type == 2)
00666         len = FFMIN(len, pos);
00667 
00668     if(++vst->cur_slice > vst->slices)
00669         return 1;
00670     AV_WL32(vst->pkt.data - 7 + 8*vst->cur_slice, 1);
00671     AV_WL32(vst->pkt.data - 3 + 8*vst->cur_slice, vst->videobufpos - 8*vst->slices - 1);
00672     if(vst->videobufpos + len > vst->videobufsize)
00673         return 1;
00674     if (avio_read(pb, vst->pkt.data + vst->videobufpos, len) != len)
00675         return AVERROR(EIO);
00676     vst->videobufpos += len;
00677     rm->remaining_len-= len;
00678 
00679     if (type == 2 || vst->videobufpos == vst->videobufsize) {
00680         vst->pkt.data[0] = vst->cur_slice-1;
00681         *pkt= vst->pkt;
00682         vst->pkt.data= NULL;
00683         vst->pkt.size= 0;
00684         if(vst->slices != vst->cur_slice) //FIXME find out how to set slices correct from the begin
00685             memmove(pkt->data + 1 + 8*vst->cur_slice, pkt->data + 1 + 8*vst->slices,
00686                 vst->videobufpos - 1 - 8*vst->slices);
00687         pkt->size = vst->videobufpos + 8*(vst->cur_slice - vst->slices);
00688         pkt->pts = AV_NOPTS_VALUE;
00689         pkt->pos = vst->pktpos;
00690         vst->slices = 0;
00691         return 0;
00692     }
00693 
00694     return 1;
00695 }
00696 
00697 static inline void
00698 rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt)
00699 {
00700     uint8_t *ptr;
00701     int j;
00702 
00703     if (st->codec->codec_id == CODEC_ID_AC3) {
00704         ptr = pkt->data;
00705         for (j=0;j<pkt->size;j+=2) {
00706             FFSWAP(int, ptr[0], ptr[1]);
00707             ptr += 2;
00708         }
00709     }
00710 }
00711 
00716 void ff_rm_reorder_sipr_data(uint8_t *buf, int sub_packet_h, int framesize)
00717 {
00718     int n, bs = sub_packet_h * framesize * 2 / 96; // nibbles per subpacket
00719 
00720     for (n = 0; n < 38; n++) {
00721         int j;
00722         int i = bs * sipr_swaps[n][0];
00723         int o = bs * sipr_swaps[n][1];
00724 
00725         /* swap 4bit-nibbles of block 'i' with 'o' */
00726         for (j = 0; j < bs; j++, i++, o++) {
00727             int x = (buf[i >> 1] >> (4 * (i & 1))) & 0xF,
00728                 y = (buf[o >> 1] >> (4 * (o & 1))) & 0xF;
00729 
00730             buf[o >> 1] = (x << (4 * (o & 1))) |
00731                 (buf[o >> 1] & (0xF << (4 * !(o & 1))));
00732             buf[i >> 1] = (y << (4 * (i & 1))) |
00733                 (buf[i >> 1] & (0xF << (4 * !(i & 1))));
00734         }
00735     }
00736 }
00737 
00738 int
00739 ff_rm_parse_packet (AVFormatContext *s, AVIOContext *pb,
00740                     AVStream *st, RMStream *ast, int len, AVPacket *pkt,
00741                     int *seq, int flags, int64_t timestamp)
00742 {
00743     RMDemuxContext *rm = s->priv_data;
00744 
00745     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
00746         rm->current_stream= st->id;
00747         if(rm_assemble_video_frame(s, pb, rm, ast, pkt, len, seq, &timestamp))
00748             return -1; //got partial frame
00749     } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
00750         if ((ast->deint_id == DEINT_ID_GENR) ||
00751             (ast->deint_id == DEINT_ID_INT4) ||
00752             (ast->deint_id == DEINT_ID_SIPR)) {
00753             int x;
00754             int sps = ast->sub_packet_size;
00755             int cfs = ast->coded_framesize;
00756             int h = ast->sub_packet_h;
00757             int y = ast->sub_packet_cnt;
00758             int w = ast->audio_framesize;
00759 
00760             if (flags & 2)
00761                 y = ast->sub_packet_cnt = 0;
00762             if (!y)
00763                 ast->audiotimestamp = timestamp;
00764 
00765             switch (ast->deint_id) {
00766                 case DEINT_ID_INT4:
00767                     for (x = 0; x < h/2; x++)
00768                         avio_read(pb, ast->pkt.data+x*2*w+y*cfs, cfs);
00769                     break;
00770                 case DEINT_ID_GENR:
00771                     for (x = 0; x < w/sps; x++)
00772                         avio_read(pb, ast->pkt.data+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
00773                     break;
00774                 case DEINT_ID_SIPR:
00775                     avio_read(pb, ast->pkt.data + y * w, w);
00776                     break;
00777             }
00778 
00779             if (++(ast->sub_packet_cnt) < h)
00780                 return -1;
00781             if (ast->deint_id == DEINT_ID_SIPR)
00782                 ff_rm_reorder_sipr_data(ast->pkt.data, h, w);
00783 
00784              ast->sub_packet_cnt = 0;
00785              rm->audio_stream_num = st->index;
00786              rm->audio_pkt_cnt = h * w / st->codec->block_align;
00787         } else if ((ast->deint_id == DEINT_ID_VBRF) ||
00788                    (ast->deint_id == DEINT_ID_VBRS)) {
00789             int x;
00790             rm->audio_stream_num = st->index;
00791             ast->sub_packet_cnt = (avio_rb16(pb) & 0xf0) >> 4;
00792             if (ast->sub_packet_cnt) {
00793                 for (x = 0; x < ast->sub_packet_cnt; x++)
00794                     ast->sub_packet_lengths[x] = avio_rb16(pb);
00795                 rm->audio_pkt_cnt = ast->sub_packet_cnt;
00796                 ast->audiotimestamp = timestamp;
00797             } else
00798                 return -1;
00799         } else {
00800             av_get_packet(pb, pkt, len);
00801             rm_ac3_swap_bytes(st, pkt);
00802         }
00803     } else
00804         av_get_packet(pb, pkt, len);
00805 
00806     pkt->stream_index = st->index;
00807 
00808 #if 0
00809     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
00810         if(st->codec->codec_id == CODEC_ID_RV20){
00811             int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
00812             av_log(s, AV_LOG_DEBUG, "%d %"PRId64" %d\n", *timestamp, *timestamp*512LL/25, seq);
00813 
00814             seq |= (timestamp&~0x3FFF);
00815             if(seq - timestamp >  0x2000) seq -= 0x4000;
00816             if(seq - timestamp < -0x2000) seq += 0x4000;
00817         }
00818     }
00819 #endif
00820 
00821     pkt->pts = timestamp;
00822     if (flags & 2)
00823         pkt->flags |= AV_PKT_FLAG_KEY;
00824 
00825     return st->codec->codec_type == AVMEDIA_TYPE_AUDIO ? rm->audio_pkt_cnt : 0;
00826 }
00827 
00828 int
00829 ff_rm_retrieve_cache (AVFormatContext *s, AVIOContext *pb,
00830                       AVStream *st, RMStream *ast, AVPacket *pkt)
00831 {
00832     RMDemuxContext *rm = s->priv_data;
00833 
00834     assert (rm->audio_pkt_cnt > 0);
00835 
00836     if (ast->deint_id == DEINT_ID_VBRF ||
00837         ast->deint_id == DEINT_ID_VBRS)
00838         av_get_packet(pb, pkt, ast->sub_packet_lengths[ast->sub_packet_cnt - rm->audio_pkt_cnt]);
00839     else {
00840         av_new_packet(pkt, st->codec->block_align);
00841         memcpy(pkt->data, ast->pkt.data + st->codec->block_align * //FIXME avoid this
00842                (ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
00843                st->codec->block_align);
00844     }
00845     rm->audio_pkt_cnt--;
00846     if ((pkt->pts = ast->audiotimestamp) != AV_NOPTS_VALUE) {
00847         ast->audiotimestamp = AV_NOPTS_VALUE;
00848         pkt->flags = AV_PKT_FLAG_KEY;
00849     } else
00850         pkt->flags = 0;
00851     pkt->stream_index = st->index;
00852 
00853     return rm->audio_pkt_cnt;
00854 }
00855 
00856 static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
00857 {
00858     RMDemuxContext *rm = s->priv_data;
00859     AVStream *st;
00860     int i, len, res, seq = 1;
00861     int64_t timestamp, pos;
00862     int flags;
00863 
00864     for (;;) {
00865         if (rm->audio_pkt_cnt) {
00866             // If there are queued audio packet return them first
00867             st = s->streams[rm->audio_stream_num];
00868             ff_rm_retrieve_cache(s, s->pb, st, st->priv_data, pkt);
00869             flags = 0;
00870         } else {
00871             if (rm->old_format) {
00872                 RMStream *ast;
00873 
00874                 st = s->streams[0];
00875                 ast = st->priv_data;
00876                 timestamp = AV_NOPTS_VALUE;
00877                 len = !ast->audio_framesize ? RAW_PACKET_SIZE :
00878                     ast->coded_framesize * ast->sub_packet_h / 2;
00879                 flags = (seq++ == 1) ? 2 : 0;
00880                 pos = avio_tell(s->pb);
00881             } else {
00882                 len=sync(s, &timestamp, &flags, &i, &pos);
00883                 if (len > 0)
00884                     st = s->streams[i];
00885             }
00886 
00887             if(len<0 || s->pb->eof_reached)
00888                 return AVERROR(EIO);
00889 
00890             res = ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,
00891                                       &seq, flags, timestamp);
00892             if((flags&2) && (seq&0x7F) == 1)
00893                 av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
00894             if (res)
00895                 continue;
00896         }
00897 
00898         if(  (st->discard >= AVDISCARD_NONKEY && !(flags&2))
00899            || st->discard >= AVDISCARD_ALL){
00900             av_free_packet(pkt);
00901         } else
00902             break;
00903     }
00904 
00905     return 0;
00906 }
00907 
00908 static int rm_read_close(AVFormatContext *s)
00909 {
00910     int i;
00911 
00912     for (i=0;i<s->nb_streams;i++)
00913         ff_rm_free_rmstream(s->streams[i]->priv_data);
00914 
00915     return 0;
00916 }
00917 
00918 static int rm_probe(AVProbeData *p)
00919 {
00920     /* check file header */
00921     if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
00922          p->buf[2] == 'M' && p->buf[3] == 'F' &&
00923          p->buf[4] == 0 && p->buf[5] == 0) ||
00924         (p->buf[0] == '.' && p->buf[1] == 'r' &&
00925          p->buf[2] == 'a' && p->buf[3] == 0xfd))
00926         return AVPROBE_SCORE_MAX;
00927     else
00928         return 0;
00929 }
00930 
00931 static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
00932                                int64_t *ppos, int64_t pos_limit)
00933 {
00934     RMDemuxContext *rm = s->priv_data;
00935     int64_t pos, dts;
00936     int stream_index2, flags, len, h;
00937 
00938     pos = *ppos;
00939 
00940     if(rm->old_format)
00941         return AV_NOPTS_VALUE;
00942 
00943     avio_seek(s->pb, pos, SEEK_SET);
00944     rm->remaining_len=0;
00945     for(;;){
00946         int seq=1;
00947         AVStream *st;
00948 
00949         len=sync(s, &dts, &flags, &stream_index2, &pos);
00950         if(len<0)
00951             return AV_NOPTS_VALUE;
00952 
00953         st = s->streams[stream_index2];
00954         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
00955             h= avio_r8(s->pb); len--;
00956             if(!(h & 0x40)){
00957                 seq = avio_r8(s->pb); len--;
00958             }
00959         }
00960 
00961         if((flags&2) && (seq&0x7F) == 1){
00962 //            av_log(s, AV_LOG_DEBUG, "%d %d-%d %"PRId64" %d\n", flags, stream_index2, stream_index, dts, seq);
00963             av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);
00964             if(stream_index2 == stream_index)
00965                 break;
00966         }
00967 
00968         avio_skip(s->pb, len);
00969     }
00970     *ppos = pos;
00971     return dts;
00972 }
00973 
00974 AVInputFormat ff_rm_demuxer = {
00975     .name           = "rm",
00976     .long_name      = NULL_IF_CONFIG_SMALL("RealMedia format"),
00977     .priv_data_size = sizeof(RMDemuxContext),
00978     .read_probe     = rm_probe,
00979     .read_header    = rm_read_header,
00980     .read_packet    = rm_read_packet,
00981     .read_close     = rm_read_close,
00982     .read_timestamp = rm_read_dts,
00983 };
00984 
00985 AVInputFormat ff_rdt_demuxer = {
00986     .name           = "rdt",
00987     .long_name      = NULL_IF_CONFIG_SMALL("RDT demuxer"),
00988     .priv_data_size = sizeof(RMDemuxContext),
00989     .read_close     = rm_read_close,
00990     .flags          = AVFMT_NOFILE,
00991 };
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