FFmpeg: libavformat/rmdec.c Source File

00001 /*
00002  * "Real" compatible demuxer.
00003  * Copyright (c) 2000, 2001 Fabrice Bellard
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #include "libavutil/avstring.h"
00023 #include "libavutil/intreadwrite.h"
00024 #include "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') 
00031 #define DEINT_ID_INT0 MKTAG('I', 'n', 't', '0') 
00032 #define DEINT_ID_INT4 MKTAG('I', 'n', 't', '4') 
00033 #define DEINT_ID_SIPR MKTAG('s', 'i', 'p', 'r') 
00034 #define DEINT_ID_VBRF MKTAG('v', 'b', 'r', 'f') 
00035 #define DEINT_ID_VBRS MKTAG('v', 'b', 'r', 's') 
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 
00237             break;
00238         case CODEC_ID_AAC:
00239             avio_rb16(pb); avio_r8(pb);
00240             if (version == 5)
00241                 avio_r8(pb);
00242             codecdata_length = avio_rb32(pb);
00243             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
00244                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
00245                 return -1;
00246             }
00247             if (codecdata_length >= 1) {
00248                 avio_r8(pb);
00249                 if ((ret = rm_read_extradata(pb, st->codec, codecdata_length - 1)) < 0)
00250                     return ret;
00251             }
00252             break;
00253         default:
00254             av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));
00255         }
00256         if (ast->deint_id == DEINT_ID_INT4 ||
00257             ast->deint_id == DEINT_ID_GENR ||
00258             ast->deint_id == DEINT_ID_SIPR) {
00259             if (st->codec->block_align <= 0 ||
00260                 ast->audio_framesize * sub_packet_h > (unsigned)INT_MAX ||
00261                 ast->audio_framesize * sub_packet_h < st->codec->block_align)
00262                 return AVERROR_INVALIDDATA;
00263             if (av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h) < 0)
00264                 return AVERROR(ENOMEM);
00265         }
00266         switch (ast->deint_id) {
00267         case DEINT_ID_INT4:
00268             if (ast->coded_framesize > ast->audio_framesize ||
00269                 sub_packet_h <= 1 ||
00270                 ast->coded_framesize * sub_packet_h > (2 + (sub_packet_h & 1)) * ast->audio_framesize)
00271                 return AVERROR_INVALIDDATA;
00272             break;
00273         case DEINT_ID_GENR:
00274             if (ast->sub_packet_size <= 0 ||
00275                 ast->sub_packet_size > ast->audio_framesize)
00276                 return AVERROR_INVALIDDATA;
00277             break;
00278         case DEINT_ID_SIPR:
00279         case DEINT_ID_INT0:
00280         case DEINT_ID_VBRS:
00281         case DEINT_ID_VBRF:
00282             break;
00283         default:
00284             av_log(NULL,0,"Unknown interleaver %X\n", ast->deint_id);
00285             return AVERROR_INVALIDDATA;
00286         }
00287 
00288         if (read_all) {
00289             avio_r8(pb);
00290             avio_r8(pb);
00291             avio_r8(pb);
00292             rm_read_metadata(s, 0);
00293         }
00294     }
00295     return 0;
00296 }
00297 
00298 int
00299 ff_rm_read_mdpr_codecdata (AVFormatContext *s, AVIOContext *pb,
00300                            AVStream *st, RMStream *rst, int codec_data_size)
00301 {
00302     unsigned int v;
00303     int size;
00304     int64_t codec_pos;
00305     int ret;
00306 
00307     avpriv_set_pts_info(st, 64, 1, 1000);
00308     codec_pos = avio_tell(pb);
00309     v = avio_rb32(pb);
00310     if (v == MKTAG(0xfd, 'a', 'r', '.')) {
00311         /* ra type header */
00312         if (rm_read_audio_stream_info(s, pb, st, rst, 0))
00313             return -1;
00314     } else {
00315         int fps;
00316         if (avio_rl32(pb) != MKTAG('V', 'I', 'D', 'O')) {
00317         fail1:
00318             av_log(s, AV_LOG_WARNING, "Unsupported stream type %08x\n", v);
00319             goto skip;
00320         }
00321         st->codec->codec_tag = avio_rl32(pb);
00322         st->codec->codec_id  = ff_codec_get_id(ff_rm_codec_tags,
00323                                                st->codec->codec_tag);
00324 //        av_log(s, AV_LOG_DEBUG, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));
00325         if (st->codec->codec_id == CODEC_ID_NONE)
00326             goto fail1;
00327         st->codec->width  = avio_rb16(pb);
00328         st->codec->height = avio_rb16(pb);
00329         avio_skip(pb, 2); // looks like bits per sample
00330         avio_skip(pb, 4); // always zero?
00331         st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00332         st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
00333         fps = avio_rb32(pb);
00334 
00335         if ((ret = rm_read_extradata(pb, st->codec, codec_data_size - (avio_tell(pb) - codec_pos))) < 0)
00336             return ret;
00337 
00338         av_reduce(&st->r_frame_rate.den, &st->r_frame_rate.num,
00339                   0x10000, fps, (1 << 30) - 1);
00340         st->avg_frame_rate = st->r_frame_rate;
00341     }
00342 
00343 skip:
00344     /* skip codec info */
00345     size = avio_tell(pb) - codec_pos;
00346     avio_skip(pb, codec_data_size - size);
00347 
00348     return 0;
00349 }
00350 
00353 static int rm_read_index(AVFormatContext *s)
00354 {
00355     AVIOContext *pb = s->pb;
00356     unsigned int size, n_pkts, str_id, next_off, n, pos, pts;
00357     AVStream *st;
00358 
00359     do {
00360         if (avio_rl32(pb) != MKTAG('I','N','D','X'))
00361             return -1;
00362         size     = avio_rb32(pb);
00363         if (size < 20)
00364             return -1;
00365         avio_skip(pb, 2);
00366         n_pkts   = avio_rb32(pb);
00367         str_id   = avio_rb16(pb);
00368         next_off = avio_rb32(pb);
00369         for (n = 0; n < s->nb_streams; n++)
00370             if (s->streams[n]->id == str_id) {
00371                 st = s->streams[n];
00372                 break;
00373             }
00374         if (n == s->nb_streams) {
00375             av_log(s, AV_LOG_ERROR,
00376                    "Invalid stream index %d for index at pos %"PRId64"\n",
00377                    str_id, avio_tell(pb));
00378             goto skip;
00379         } else if ((avio_size(pb) - avio_tell(pb)) / 14 < n_pkts) {
00380             av_log(s, AV_LOG_ERROR,
00381                    "Nr. of packets in packet index for stream index %d "
00382                    "exceeds filesize (%"PRId64" at %"PRId64" = %d)\n",
00383                    str_id, avio_size(pb), avio_tell(pb),
00384                    (avio_size(pb) - avio_tell(pb)) / 14);
00385             goto skip;
00386         }
00387 
00388         for (n = 0; n < n_pkts; n++) {
00389             avio_skip(pb, 2);
00390             pts = avio_rb32(pb);
00391             pos = avio_rb32(pb);
00392             avio_skip(pb, 4); /* packet no. */
00393 
00394             av_add_index_entry(st, pos, pts, 0, 0, AVINDEX_KEYFRAME);
00395         }
00396 
00397 skip:
00398         if (next_off && avio_tell(pb) < next_off &&
00399             avio_seek(pb, next_off, SEEK_SET) < 0) {
00400             av_log(s, AV_LOG_ERROR,
00401                    "Non-linear index detected, not supported\n");
00402             return -1;
00403         }
00404     } while (next_off);
00405 
00406     return 0;
00407 }
00408 
00409 static int rm_read_header_old(AVFormatContext *s)
00410 {
00411     RMDemuxContext *rm = s->priv_data;
00412     AVStream *st;
00413 
00414     rm->old_format = 1;
00415     st = avformat_new_stream(s, NULL);
00416     if (!st)
00417         return -1;
00418     st->priv_data = ff_rm_alloc_rmstream();
00419     return rm_read_audio_stream_info(s, s->pb, st, st->priv_data, 1);
00420 }
00421 
00422 static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
00423 {
00424     RMDemuxContext *rm = s->priv_data;
00425     AVStream *st;
00426     AVIOContext *pb = s->pb;
00427     unsigned int tag;
00428     int tag_size;
00429     unsigned int start_time, duration;
00430     unsigned int data_off = 0, indx_off = 0;
00431     char buf[128];
00432     int flags = 0;
00433 
00434     tag = avio_rl32(pb);
00435     if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
00436         /* very old .ra format */
00437         return rm_read_header_old(s);
00438     } else if (tag != MKTAG('.', 'R', 'M', 'F')) {
00439         return AVERROR(EIO);
00440     }
00441 
00442     avio_rb32(pb); /* header size */
00443     avio_rb16(pb);
00444     avio_rb32(pb);
00445     avio_rb32(pb); /* number of headers */
00446 
00447     for(;;) {
00448         if (url_feof(pb))
00449             return -1;
00450         tag = avio_rl32(pb);
00451         tag_size = avio_rb32(pb);
00452         avio_rb16(pb);
00453         av_dlog(s, "tag=%c%c%c%c (%08x) size=%d\n",
00454                 (tag      ) & 0xff,
00455                 (tag >>  8) & 0xff,
00456                 (tag >> 16) & 0xff,
00457                 (tag >> 24) & 0xff,
00458                 tag,
00459                 tag_size);
00460         if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
00461             return -1;
00462         switch(tag) {
00463         case MKTAG('P', 'R', 'O', 'P'):
00464             /* file header */
00465             avio_rb32(pb); /* max bit rate */
00466             avio_rb32(pb); /* avg bit rate */
00467             avio_rb32(pb); /* max packet size */
00468             avio_rb32(pb); /* avg packet size */
00469             avio_rb32(pb); /* nb packets */
00470             avio_rb32(pb); /* duration */
00471             avio_rb32(pb); /* preroll */
00472             indx_off = avio_rb32(pb); /* index offset */
00473             data_off = avio_rb32(pb); /* data offset */
00474             avio_rb16(pb); /* nb streams */
00475             flags = avio_rb16(pb); /* flags */
00476             break;
00477         case MKTAG('C', 'O', 'N', 'T'):
00478             rm_read_metadata(s, 1);
00479             break;
00480         case MKTAG('M', 'D', 'P', 'R'):
00481             st = avformat_new_stream(s, NULL);
00482             if (!st)
00483                 return AVERROR(ENOMEM);
00484             st->id = avio_rb16(pb);
00485             avio_rb32(pb); /* max bit rate */
00486             st->codec->bit_rate = avio_rb32(pb); /* bit rate */
00487             avio_rb32(pb); /* max packet size */
00488             avio_rb32(pb); /* avg packet size */
00489             start_time = avio_rb32(pb); /* start time */
00490             avio_rb32(pb); /* preroll */
00491             duration = avio_rb32(pb); /* duration */
00492             st->start_time = start_time;
00493             st->duration = duration;
00494             get_str8(pb, buf, sizeof(buf)); /* desc */
00495             get_str8(pb, buf, sizeof(buf)); /* mimetype */
00496             st->codec->codec_type = AVMEDIA_TYPE_DATA;
00497             st->priv_data = ff_rm_alloc_rmstream();
00498             if (ff_rm_read_mdpr_codecdata(s, s->pb, st, st->priv_data,
00499                                           avio_rb32(pb)) < 0)
00500                 return -1;
00501             break;
00502         case MKTAG('D', 'A', 'T', 'A'):
00503             goto header_end;
00504         default:
00505             /* unknown tag: skip it */
00506             avio_skip(pb, tag_size - 10);
00507             break;
00508         }
00509     }
00510  header_end:
00511     rm->nb_packets = avio_rb32(pb); /* number of packets */
00512     if (!rm->nb_packets && (flags & 4))
00513         rm->nb_packets = 3600 * 25;
00514     avio_rb32(pb); /* next data header */
00515 
00516     if (!data_off)
00517         data_off = avio_tell(pb) - 18;
00518     if (indx_off && pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
00519         avio_seek(pb, indx_off, SEEK_SET) >= 0) {
00520         rm_read_index(s);
00521         avio_seek(pb, data_off + 18, SEEK_SET);
00522     }
00523 
00524     return 0;
00525 }
00526 
00527 static int get_num(AVIOContext *pb, int *len)
00528 {
00529     int n, n1;
00530 
00531     n = avio_rb16(pb);
00532     (*len)-=2;
00533     n &= 0x7FFF;
00534     if (n >= 0x4000) {
00535         return n - 0x4000;
00536     } else {
00537         n1 = avio_rb16(pb);
00538         (*len)-=2;
00539         return (n << 16) | n1;
00540     }
00541 }
00542 
00543 /* multiple of 20 bytes for ra144 (ugly) */
00544 #define RAW_PACKET_SIZE 1000
00545 
00546 static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
00547     RMDemuxContext *rm = s->priv_data;
00548     AVIOContext *pb = s->pb;
00549     AVStream *st;
00550     uint32_t state=0xFFFFFFFF;
00551 
00552     while(!url_feof(pb)){
00553         int len, num, i;
00554         *pos= avio_tell(pb) - 3;
00555         if(rm->remaining_len > 0){
00556             num= rm->current_stream;
00557             len= rm->remaining_len;
00558             *timestamp = AV_NOPTS_VALUE;
00559             *flags= 0;
00560         }else{
00561             state= (state<<8) + avio_r8(pb);
00562 
00563             if(state == MKBETAG('I', 'N', 'D', 'X')){
00564                 int n_pkts, expected_len;
00565                 len = avio_rb32(pb);
00566                 avio_skip(pb, 2);
00567                 n_pkts = avio_rb32(pb);
00568                 expected_len = 20 + n_pkts * 14;
00569                 if (len == 20)
00570                     /* some files don't add index entries to chunk size... */
00571                     len = expected_len;
00572                 else if (len != expected_len)
00573                     av_log(s, AV_LOG_WARNING,
00574                            "Index size %d (%d pkts) is wrong, should be %d.\n",
00575                            len, n_pkts, expected_len);
00576                 len -= 14; // we already read part of the index header
00577                 if(len<0)
00578                     continue;
00579                 goto skip;
00580             } else if (state == MKBETAG('D','A','T','A')) {
00581                 av_log(s, AV_LOG_WARNING,
00582                        "DATA tag in middle of chunk, file may be broken.\n");
00583             }
00584 
00585             if(state > (unsigned)0xFFFF || state <= 12)
00586                 continue;
00587             len=state - 12;
00588             state= 0xFFFFFFFF;
00589 
00590             num = avio_rb16(pb);
00591             *timestamp = avio_rb32(pb);
00592             avio_r8(pb); /* reserved */
00593             *flags = avio_r8(pb); /* flags */
00594         }
00595         for(i=0;i<s->nb_streams;i++) {
00596             st = s->streams[i];
00597             if (num == st->id)
00598                 break;
00599         }
00600         if (i == s->nb_streams) {
00601 skip:
00602             /* skip packet if unknown number */
00603             avio_skip(pb, len);
00604             rm->remaining_len = 0;
00605             continue;
00606         }
00607         *stream_index= i;
00608 
00609         return len;
00610     }
00611     return -1;
00612 }
00613 
00614 static int rm_assemble_video_frame(AVFormatContext *s, AVIOContext *pb,
00615                                    RMDemuxContext *rm, RMStream *vst,
00616                                    AVPacket *pkt, int len, int *pseq,
00617                                    int64_t *timestamp)
00618 {
00619     int hdr, seq, pic_num, len2, pos;
00620     int type;
00621 
00622     hdr = avio_r8(pb); len--;
00623     type = hdr >> 6;
00624 
00625     if(type != 3){  // not frame as a part of packet
00626         seq = avio_r8(pb); len--;
00627     }
00628     if(type != 1){  // not whole frame
00629         len2 = get_num(pb, &len);
00630         pos  = get_num(pb, &len);
00631         pic_num = avio_r8(pb); len--;
00632     }
00633     if(len<0)
00634         return -1;
00635     rm->remaining_len = len;
00636     if(type&1){     // frame, not slice
00637         if(type == 3){  // frame as a part of packet
00638             len= len2;
00639             *timestamp = pos;
00640         }
00641         if(rm->remaining_len < len)
00642             return -1;
00643         rm->remaining_len -= len;
00644         if(av_new_packet(pkt, len + 9) < 0)
00645             return AVERROR(EIO);
00646         pkt->data[0] = 0;
00647         AV_WL32(pkt->data + 1, 1);
00648         AV_WL32(pkt->data + 5, 0);
00649         avio_read(pb, pkt->data + 9, len);
00650         return 0;
00651     }
00652     //now we have to deal with single slice
00653 
00654     *pseq = seq;
00655     if((seq & 0x7F) == 1 || vst->curpic_num != pic_num){
00656         vst->slices = ((hdr & 0x3F) << 1) + 1;
00657         vst->videobufsize = len2 + 8*vst->slices + 1;
00658         av_free_packet(&vst->pkt); //FIXME this should be output.
00659         if(av_new_packet(&vst->pkt, vst->videobufsize) < 0)
00660             return AVERROR(ENOMEM);
00661         vst->videobufpos = 8*vst->slices + 1;
00662         vst->cur_slice = 0;
00663         vst->curpic_num = pic_num;
00664         vst->pktpos = avio_tell(pb);
00665     }
00666     if(type == 2)
00667         len = FFMIN(len, pos);
00668 
00669     if(++vst->cur_slice > vst->slices)
00670         return 1;
00671     AV_WL32(vst->pkt.data - 7 + 8*vst->cur_slice, 1);
00672     AV_WL32(vst->pkt.data - 3 + 8*vst->cur_slice, vst->videobufpos - 8*vst->slices - 1);
00673     if(vst->videobufpos + len > vst->videobufsize)
00674         return 1;
00675     if (avio_read(pb, vst->pkt.data + vst->videobufpos, len) != len)
00676         return AVERROR(EIO);
00677     vst->videobufpos += len;
00678     rm->remaining_len-= len;
00679 
00680     if (type == 2 || vst->videobufpos == vst->videobufsize) {
00681         vst->pkt.data[0] = vst->cur_slice-1;
00682         *pkt= vst->pkt;
00683         vst->pkt.data= NULL;
00684         vst->pkt.size= 0;
00685         if(vst->slices != vst->cur_slice) //FIXME find out how to set slices correct from the begin
00686             memmove(pkt->data + 1 + 8*vst->cur_slice, pkt->data + 1 + 8*vst->slices,
00687                 vst->videobufpos - 1 - 8*vst->slices);
00688         pkt->size = vst->videobufpos + 8*(vst->cur_slice - vst->slices);
00689         pkt->pts = AV_NOPTS_VALUE;
00690         pkt->pos = vst->pktpos;
00691         vst->slices = 0;
00692         return 0;
00693     }
00694 
00695     return 1;
00696 }
00697 
00698 static inline void
00699 rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt)
00700 {
00701     uint8_t *ptr;
00702     int j;
00703 
00704     if (st->codec->codec_id == CODEC_ID_AC3) {
00705         ptr = pkt->data;
00706         for (j=0;j<pkt->size;j+=2) {
00707             FFSWAP(int, ptr[0], ptr[1]);
00708             ptr += 2;
00709         }
00710     }
00711 }
00712 
00717 void ff_rm_reorder_sipr_data(uint8_t *buf, int sub_packet_h, int framesize)
00718 {
00719     int n, bs = sub_packet_h * framesize * 2 / 96; // nibbles per subpacket
00720 
00721     for (n = 0; n < 38; n++) {
00722         int j;
00723         int i = bs * sipr_swaps[n][0];
00724         int o = bs * sipr_swaps[n][1];
00725 
00726         /* swap 4bit-nibbles of block 'i' with 'o' */
00727         for (j = 0; j < bs; j++, i++, o++) {
00728             int x = (buf[i >> 1] >> (4 * (i & 1))) & 0xF,
00729                 y = (buf[o >> 1] >> (4 * (o & 1))) & 0xF;
00730 
00731             buf[o >> 1] = (x << (4 * (o & 1))) |
00732                 (buf[o >> 1] & (0xF << (4 * !(o & 1))));
00733             buf[i >> 1] = (y << (4 * (i & 1))) |
00734                 (buf[i >> 1] & (0xF << (4 * !(i & 1))));
00735         }
00736     }
00737 }
00738 
00739 int
00740 ff_rm_parse_packet (AVFormatContext *s, AVIOContext *pb,
00741                     AVStream *st, RMStream *ast, int len, AVPacket *pkt,
00742                     int *seq, int flags, int64_t timestamp)
00743 {
00744     RMDemuxContext *rm = s->priv_data;
00745 
00746     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
00747         rm->current_stream= st->id;
00748         if(rm_assemble_video_frame(s, pb, rm, ast, pkt, len, seq, &timestamp))
00749             return -1; //got partial frame
00750     } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
00751         if ((ast->deint_id == DEINT_ID_GENR) ||
00752             (ast->deint_id == DEINT_ID_INT4) ||
00753             (ast->deint_id == DEINT_ID_SIPR)) {
00754             int x;
00755             int sps = ast->sub_packet_size;
00756             int cfs = ast->coded_framesize;
00757             int h = ast->sub_packet_h;
00758             int y = ast->sub_packet_cnt;
00759             int w = ast->audio_framesize;
00760 
00761             if (flags & 2)
00762                 y = ast->sub_packet_cnt = 0;
00763             if (!y)
00764                 ast->audiotimestamp = timestamp;
00765 
00766             switch (ast->deint_id) {
00767                 case DEINT_ID_INT4:
00768                     for (x = 0; x < h/2; x++)
00769                         avio_read(pb, ast->pkt.data+x*2*w+y*cfs, cfs);
00770                     break;
00771                 case DEINT_ID_GENR:
00772                     for (x = 0; x < w/sps; x++)
00773                         avio_read(pb, ast->pkt.data+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
00774                     break;
00775                 case DEINT_ID_SIPR:
00776                     avio_read(pb, ast->pkt.data + y * w, w);
00777                     break;
00778             }
00779 
00780             if (++(ast->sub_packet_cnt) < h)
00781                 return -1;
00782             if (ast->deint_id == DEINT_ID_SIPR)
00783                 ff_rm_reorder_sipr_data(ast->pkt.data, h, w);
00784 
00785              ast->sub_packet_cnt = 0;
00786              rm->audio_stream_num = st->index;
00787              rm->audio_pkt_cnt = h * w / st->codec->block_align;
00788         } else if ((ast->deint_id == DEINT_ID_VBRF) ||
00789                    (ast->deint_id == DEINT_ID_VBRS)) {
00790             int x;
00791             rm->audio_stream_num = st->index;
00792             ast->sub_packet_cnt = (avio_rb16(pb) & 0xf0) >> 4;
00793             if (ast->sub_packet_cnt) {
00794                 for (x = 0; x < ast->sub_packet_cnt; x++)
00795                     ast->sub_packet_lengths[x] = avio_rb16(pb);
00796                 rm->audio_pkt_cnt = ast->sub_packet_cnt;
00797                 ast->audiotimestamp = timestamp;
00798             } else
00799                 return -1;
00800         } else {
00801             av_get_packet(pb, pkt, len);
00802             rm_ac3_swap_bytes(st, pkt);
00803         }
00804     } else
00805         av_get_packet(pb, pkt, len);
00806 
00807     pkt->stream_index = st->index;
00808 
00809 #if 0
00810     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
00811         if(st->codec->codec_id == CODEC_ID_RV20){
00812             int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
00813             av_log(s, AV_LOG_DEBUG, "%d %"PRId64" %d\n", *timestamp, *timestamp*512LL/25, seq);
00814 
00815             seq |= (timestamp&~0x3FFF);
00816             if(seq - timestamp >  0x2000) seq -= 0x4000;
00817             if(seq - timestamp < -0x2000) seq += 0x4000;
00818         }
00819     }
00820 #endif
00821 
00822     pkt->pts = timestamp;
00823     if (flags & 2)
00824         pkt->flags |= AV_PKT_FLAG_KEY;
00825 
00826     return st->codec->codec_type == AVMEDIA_TYPE_AUDIO ? rm->audio_pkt_cnt : 0;
00827 }
00828 
00829 int
00830 ff_rm_retrieve_cache (AVFormatContext *s, AVIOContext *pb,
00831                       AVStream *st, RMStream *ast, AVPacket *pkt)
00832 {
00833     RMDemuxContext *rm = s->priv_data;
00834 
00835     assert (rm->audio_pkt_cnt > 0);
00836 
00837     if (ast->deint_id == DEINT_ID_VBRF ||
00838         ast->deint_id == DEINT_ID_VBRS)
00839         av_get_packet(pb, pkt, ast->sub_packet_lengths[ast->sub_packet_cnt - rm->audio_pkt_cnt]);
00840     else {
00841         av_new_packet(pkt, st->codec->block_align);
00842         memcpy(pkt->data, ast->pkt.data + st->codec->block_align * //FIXME avoid this
00843                (ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
00844                st->codec->block_align);
00845     }
00846     rm->audio_pkt_cnt--;
00847     if ((pkt->pts = ast->audiotimestamp) != AV_NOPTS_VALUE) {
00848         ast->audiotimestamp = AV_NOPTS_VALUE;
00849         pkt->flags = AV_PKT_FLAG_KEY;
00850     } else
00851         pkt->flags = 0;
00852     pkt->stream_index = st->index;
00853 
00854     return rm->audio_pkt_cnt;
00855 }
00856 
00857 static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
00858 {
00859     RMDemuxContext *rm = s->priv_data;
00860     AVStream *st;
00861     int i, len, res, seq = 1;
00862     int64_t timestamp, pos;
00863     int flags;
00864 
00865     for (;;) {
00866         if (rm->audio_pkt_cnt) {
00867             // If there are queued audio packet return them first
00868             st = s->streams[rm->audio_stream_num];
00869             ff_rm_retrieve_cache(s, s->pb, st, st->priv_data, pkt);
00870             flags = 0;
00871         } else {
00872             if (rm->old_format) {
00873                 RMStream *ast;
00874 
00875                 st = s->streams[0];
00876                 ast = st->priv_data;
00877                 timestamp = AV_NOPTS_VALUE;
00878                 len = !ast->audio_framesize ? RAW_PACKET_SIZE :
00879                     ast->coded_framesize * ast->sub_packet_h / 2;
00880                 flags = (seq++ == 1) ? 2 : 0;
00881                 pos = avio_tell(s->pb);
00882             } else {
00883                 len=sync(s, &timestamp, &flags, &i, &pos);
00884                 if (len > 0)
00885                     st = s->streams[i];
00886             }
00887 
00888             if(len<0 || url_feof(s->pb))
00889                 return AVERROR(EIO);
00890 
00891             res = ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,
00892                                       &seq, flags, timestamp);
00893             if((flags&2) && (seq&0x7F) == 1)
00894                 av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
00895             if (res)
00896                 continue;
00897         }
00898 
00899         if(  (st->discard >= AVDISCARD_NONKEY && !(flags&2))
00900            || st->discard >= AVDISCARD_ALL){
00901             av_free_packet(pkt);
00902         } else
00903             break;
00904     }
00905 
00906     return 0;
00907 }
00908 
00909 static int rm_read_close(AVFormatContext *s)
00910 {
00911     int i;
00912 
00913     for (i=0;i<s->nb_streams;i++)
00914         ff_rm_free_rmstream(s->streams[i]->priv_data);
00915 
00916     return 0;
00917 }
00918 
00919 static int rm_probe(AVProbeData *p)
00920 {
00921     /* check file header */
00922     if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
00923          p->buf[2] == 'M' && p->buf[3] == 'F' &&
00924          p->buf[4] == 0 && p->buf[5] == 0) ||
00925         (p->buf[0] == '.' && p->buf[1] == 'r' &&
00926          p->buf[2] == 'a' && p->buf[3] == 0xfd))
00927         return AVPROBE_SCORE_MAX;
00928     else
00929         return 0;
00930 }
00931 
00932 static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
00933                                int64_t *ppos, int64_t pos_limit)
00934 {
00935     RMDemuxContext *rm = s->priv_data;
00936     int64_t pos, dts;
00937     int stream_index2, flags, len, h;
00938 
00939     pos = *ppos;
00940 
00941     if(rm->old_format)
00942         return AV_NOPTS_VALUE;
00943 
00944     if (avio_seek(s->pb, pos, SEEK_SET) < 0)
00945         return AV_NOPTS_VALUE;
00946 
00947     rm->remaining_len=0;
00948     for(;;){
00949         int seq=1;
00950         AVStream *st;
00951 
00952         len=sync(s, &dts, &flags, &stream_index2, &pos);
00953         if(len<0)
00954             return AV_NOPTS_VALUE;
00955 
00956         st = s->streams[stream_index2];
00957         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
00958             h= avio_r8(s->pb); len--;
00959             if(!(h & 0x40)){
00960                 seq = avio_r8(s->pb); len--;
00961             }
00962         }
00963 
00964         if((flags&2) && (seq&0x7F) == 1){
00965 //            av_log(s, AV_LOG_DEBUG, "%d %d-%d %"PRId64" %d\n", flags, stream_index2, stream_index, dts, seq);
00966             av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);
00967             if(stream_index2 == stream_index)
00968                 break;
00969         }
00970 
00971         avio_skip(s->pb, len);
00972     }
00973     *ppos = pos;
00974     return dts;
00975 }
00976 
00977 AVInputFormat ff_rm_demuxer = {
00978     .name           = "rm",
00979     .long_name      = NULL_IF_CONFIG_SMALL("RealMedia format"),
00980     .priv_data_size = sizeof(RMDemuxContext),
00981     .read_probe     = rm_probe,
00982     .read_header    = rm_read_header,
00983     .read_packet    = rm_read_packet,
00984     .read_close     = rm_read_close,
00985     .read_timestamp = rm_read_dts,
00986 };
00987 
00988 AVInputFormat ff_rdt_demuxer = {
00989     .name           = "rdt",
00990     .long_name      = NULL_IF_CONFIG_SMALL("RDT demuxer"),
00991     .priv_data_size = sizeof(RMDemuxContext),
00992     .read_close     = rm_read_close,
00993     .flags          = AVFMT_NOFILE,
00994 };