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             st->need_parsing = AVSTREAM_PARSE_HEADERS;
00209         case CODEC_ID_ATRAC3:
00210         case CODEC_ID_SIPR:
00211             avio_rb16(pb); avio_r8(pb);
00212             if (version == 5)
00213                 avio_r8(pb);
00214             codecdata_length = avio_rb32(pb);
00215             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
00216                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
00217                 return -1;
00218             }
00219 
00220             ast->audio_framesize = st->codec->block_align;
00221             if (st->codec->codec_id == CODEC_ID_SIPR) {
00222                 if (flavor > 3) {
00223                     av_log(s, AV_LOG_ERROR, "bad SIPR file flavor %d\n",
00224                            flavor);
00225                     return -1;
00226                 }
00227                 st->codec->block_align = ff_sipr_subpk_size[flavor];
00228             } else {
00229                 if(sub_packet_size <= 0){
00230                     av_log(s, AV_LOG_ERROR, "sub_packet_size is invalid\n");
00231                     return -1;
00232                 }
00233                 st->codec->block_align = ast->sub_packet_size;
00234             }
00235             if ((ret = rm_read_extradata(pb, st->codec, codecdata_length)) < 0)
00236                 return ret;
00237 
00238             break;
00239         case CODEC_ID_AAC:
00240             avio_rb16(pb); avio_r8(pb);
00241             if (version == 5)
00242                 avio_r8(pb);
00243             codecdata_length = avio_rb32(pb);
00244             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
00245                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
00246                 return -1;
00247             }
00248             if (codecdata_length >= 1) {
00249                 avio_r8(pb);
00250                 if ((ret = rm_read_extradata(pb, st->codec, codecdata_length - 1)) < 0)
00251                     return ret;
00252             }
00253             break;
00254         default:
00255             av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));
00256         }
00257         if (ast->deint_id == DEINT_ID_INT4 ||
00258             ast->deint_id == DEINT_ID_GENR ||
00259             ast->deint_id == DEINT_ID_SIPR) {
00260             if (st->codec->block_align <= 0 ||
00261                 ast->audio_framesize * sub_packet_h > (unsigned)INT_MAX ||
00262                 ast->audio_framesize * sub_packet_h < st->codec->block_align)
00263                 return AVERROR_INVALIDDATA;
00264             if (av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h) < 0)
00265                 return AVERROR(ENOMEM);
00266         }
00267         switch (ast->deint_id) {
00268         case DEINT_ID_INT4:
00269             if (ast->coded_framesize > ast->audio_framesize ||
00270                 sub_packet_h <= 1 ||
00271                 ast->coded_framesize * sub_packet_h > (2 + (sub_packet_h & 1)) * ast->audio_framesize)
00272                 return AVERROR_INVALIDDATA;
00273             break;
00274         case DEINT_ID_GENR:
00275             if (ast->sub_packet_size <= 0 ||
00276                 ast->sub_packet_size > ast->audio_framesize)
00277                 return AVERROR_INVALIDDATA;
00278             break;
00279         case DEINT_ID_SIPR:
00280         case DEINT_ID_INT0:
00281         case DEINT_ID_VBRS:
00282         case DEINT_ID_VBRF:
00283             break;
00284         default:
00285             av_log(NULL,0,"Unknown interleaver %X\n", ast->deint_id);
00286             return AVERROR_INVALIDDATA;
00287         }
00288 
00289         if (read_all) {
00290             avio_r8(pb);
00291             avio_r8(pb);
00292             avio_r8(pb);
00293             rm_read_metadata(s, 0);
00294         }
00295     }
00296     return 0;
00297 }
00298 
00299 int
00300 ff_rm_read_mdpr_codecdata (AVFormatContext *s, AVIOContext *pb,
00301                            AVStream *st, RMStream *rst, int codec_data_size)
00302 {
00303     unsigned int v;
00304     int size;
00305     int64_t codec_pos;
00306     int ret;
00307 
00308     avpriv_set_pts_info(st, 64, 1, 1000);
00309     codec_pos = avio_tell(pb);
00310     v = avio_rb32(pb);
00311     if (v == MKTAG(0xfd, 'a', 'r', '.')) {
00312         /* ra type header */
00313         if (rm_read_audio_stream_info(s, pb, st, rst, 0))
00314             return -1;
00315     } else if (v == MKBETAG('L', 'S', 'D', ':')) {
00316         avio_seek(pb, -4, SEEK_CUR);
00317         if ((ret = rm_read_extradata(pb, st->codec, codec_data_size)) < 0)
00318             return ret;
00319 
00320         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00321         st->codec->codec_tag  = AV_RL32(st->codec->extradata);
00322         st->codec->codec_id   = ff_codec_get_id(ff_rm_codec_tags,
00323                                                 st->codec->codec_tag);
00324     } else {
00325         int fps;
00326         if (avio_rl32(pb) != MKTAG('V', 'I', 'D', 'O')) {
00327         fail1:
00328             av_log(s, AV_LOG_WARNING, "Unsupported stream type %08x\n", v);
00329             goto skip;
00330         }
00331         st->codec->codec_tag = avio_rl32(pb);
00332         st->codec->codec_id  = ff_codec_get_id(ff_rm_codec_tags,
00333                                                st->codec->codec_tag);
00334 //        av_log(s, AV_LOG_DEBUG, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));
00335         if (st->codec->codec_id == CODEC_ID_NONE)
00336             goto fail1;
00337         st->codec->width  = avio_rb16(pb);
00338         st->codec->height = avio_rb16(pb);
00339         avio_skip(pb, 2); // looks like bits per sample
00340         avio_skip(pb, 4); // always zero?
00341         st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00342         st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
00343         fps = avio_rb32(pb);
00344 
00345         if ((ret = rm_read_extradata(pb, st->codec, codec_data_size - (avio_tell(pb) - codec_pos))) < 0)
00346             return ret;
00347 
00348         av_reduce(&st->r_frame_rate.den, &st->r_frame_rate.num,
00349                   0x10000, fps, (1 << 30) - 1);
00350         st->avg_frame_rate = st->r_frame_rate;
00351     }
00352 
00353 skip:
00354     /* skip codec info */
00355     size = avio_tell(pb) - codec_pos;
00356     avio_skip(pb, codec_data_size - size);
00357 
00358     return 0;
00359 }
00360 
00363 static int rm_read_index(AVFormatContext *s)
00364 {
00365     AVIOContext *pb = s->pb;
00366     unsigned int size, n_pkts, str_id, next_off, n, pos, pts;
00367     AVStream *st;
00368 
00369     do {
00370         if (avio_rl32(pb) != MKTAG('I','N','D','X'))
00371             return -1;
00372         size     = avio_rb32(pb);
00373         if (size < 20)
00374             return -1;
00375         avio_skip(pb, 2);
00376         n_pkts   = avio_rb32(pb);
00377         str_id   = avio_rb16(pb);
00378         next_off = avio_rb32(pb);
00379         for (n = 0; n < s->nb_streams; n++)
00380             if (s->streams[n]->id == str_id) {
00381                 st = s->streams[n];
00382                 break;
00383             }
00384         if (n == s->nb_streams) {
00385             av_log(s, AV_LOG_ERROR,
00386                    "Invalid stream index %d for index at pos %"PRId64"\n",
00387                    str_id, avio_tell(pb));
00388             goto skip;
00389         } else if ((avio_size(pb) - avio_tell(pb)) / 14 < n_pkts) {
00390             av_log(s, AV_LOG_ERROR,
00391                    "Nr. of packets in packet index for stream index %d "
00392                    "exceeds filesize (%"PRId64" at %"PRId64" = %"PRId64")\n",
00393                    str_id, avio_size(pb), avio_tell(pb),
00394                    (avio_size(pb) - avio_tell(pb)) / 14);
00395             goto skip;
00396         }
00397 
00398         for (n = 0; n < n_pkts; n++) {
00399             avio_skip(pb, 2);
00400             pts = avio_rb32(pb);
00401             pos = avio_rb32(pb);
00402             avio_skip(pb, 4); /* packet no. */
00403 
00404             av_add_index_entry(st, pos, pts, 0, 0, AVINDEX_KEYFRAME);
00405         }
00406 
00407 skip:
00408         if (next_off && avio_tell(pb) < next_off &&
00409             avio_seek(pb, next_off, SEEK_SET) < 0) {
00410             av_log(s, AV_LOG_ERROR,
00411                    "Non-linear index detected, not supported\n");
00412             return -1;
00413         }
00414     } while (next_off);
00415 
00416     return 0;
00417 }
00418 
00419 static int rm_read_header_old(AVFormatContext *s)
00420 {
00421     RMDemuxContext *rm = s->priv_data;
00422     AVStream *st;
00423 
00424     rm->old_format = 1;
00425     st = avformat_new_stream(s, NULL);
00426     if (!st)
00427         return -1;
00428     st->priv_data = ff_rm_alloc_rmstream();
00429     return rm_read_audio_stream_info(s, s->pb, st, st->priv_data, 1);
00430 }
00431 
00432 static int rm_read_header(AVFormatContext *s)
00433 {
00434     RMDemuxContext *rm = s->priv_data;
00435     AVStream *st;
00436     AVIOContext *pb = s->pb;
00437     unsigned int tag;
00438     int tag_size;
00439     unsigned int start_time, duration;
00440     unsigned int data_off = 0, indx_off = 0;
00441     char buf[128];
00442     int flags = 0;
00443 
00444     tag = avio_rl32(pb);
00445     if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
00446         /* very old .ra format */
00447         return rm_read_header_old(s);
00448     } else if (tag != MKTAG('.', 'R', 'M', 'F')) {
00449         return AVERROR(EIO);
00450     }
00451 
00452     tag_size = avio_rb32(pb);
00453     avio_skip(pb, tag_size - 8);
00454 
00455     for(;;) {
00456         if (url_feof(pb))
00457             return -1;
00458         tag = avio_rl32(pb);
00459         tag_size = avio_rb32(pb);
00460         avio_rb16(pb);
00461         av_dlog(s, "tag=%c%c%c%c (%08x) size=%d\n",
00462                 (tag      ) & 0xff,
00463                 (tag >>  8) & 0xff,
00464                 (tag >> 16) & 0xff,
00465                 (tag >> 24) & 0xff,
00466                 tag,
00467                 tag_size);
00468         if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
00469             return -1;
00470         switch(tag) {
00471         case MKTAG('P', 'R', 'O', 'P'):
00472             /* file header */
00473             avio_rb32(pb); /* max bit rate */
00474             avio_rb32(pb); /* avg bit rate */
00475             avio_rb32(pb); /* max packet size */
00476             avio_rb32(pb); /* avg packet size */
00477             avio_rb32(pb); /* nb packets */
00478             avio_rb32(pb); /* duration */
00479             avio_rb32(pb); /* preroll */
00480             indx_off = avio_rb32(pb); /* index offset */
00481             data_off = avio_rb32(pb); /* data offset */
00482             avio_rb16(pb); /* nb streams */
00483             flags = avio_rb16(pb); /* flags */
00484             break;
00485         case MKTAG('C', 'O', 'N', 'T'):
00486             rm_read_metadata(s, 1);
00487             break;
00488         case MKTAG('M', 'D', 'P', 'R'):
00489             st = avformat_new_stream(s, NULL);
00490             if (!st)
00491                 return AVERROR(ENOMEM);
00492             st->id = avio_rb16(pb);
00493             avio_rb32(pb); /* max bit rate */
00494             st->codec->bit_rate = avio_rb32(pb); /* bit rate */
00495             avio_rb32(pb); /* max packet size */
00496             avio_rb32(pb); /* avg packet size */
00497             start_time = avio_rb32(pb); /* start time */
00498             avio_rb32(pb); /* preroll */
00499             duration = avio_rb32(pb); /* duration */
00500             st->start_time = start_time;
00501             st->duration = duration;
00502             get_str8(pb, buf, sizeof(buf)); /* desc */
00503             get_str8(pb, buf, sizeof(buf)); /* mimetype */
00504             st->codec->codec_type = AVMEDIA_TYPE_DATA;
00505             st->priv_data = ff_rm_alloc_rmstream();
00506             if (ff_rm_read_mdpr_codecdata(s, s->pb, st, st->priv_data,
00507                                           avio_rb32(pb)) < 0)
00508                 return -1;
00509             break;
00510         case MKTAG('D', 'A', 'T', 'A'):
00511             goto header_end;
00512         default:
00513             /* unknown tag: skip it */
00514             avio_skip(pb, tag_size - 10);
00515             break;
00516         }
00517     }
00518  header_end:
00519     rm->nb_packets = avio_rb32(pb); /* number of packets */
00520     if (!rm->nb_packets && (flags & 4))
00521         rm->nb_packets = 3600 * 25;
00522     avio_rb32(pb); /* next data header */
00523 
00524     if (!data_off)
00525         data_off = avio_tell(pb) - 18;
00526     if (indx_off && pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
00527         avio_seek(pb, indx_off, SEEK_SET) >= 0) {
00528         rm_read_index(s);
00529         avio_seek(pb, data_off + 18, SEEK_SET);
00530     }
00531 
00532     return 0;
00533 }
00534 
00535 static int get_num(AVIOContext *pb, int *len)
00536 {
00537     int n, n1;
00538 
00539     n = avio_rb16(pb);
00540     (*len)-=2;
00541     n &= 0x7FFF;
00542     if (n >= 0x4000) {
00543         return n - 0x4000;
00544     } else {
00545         n1 = avio_rb16(pb);
00546         (*len)-=2;
00547         return (n << 16) | n1;
00548     }
00549 }
00550 
00551 /* multiple of 20 bytes for ra144 (ugly) */
00552 #define RAW_PACKET_SIZE 1000
00553 
00554 static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
00555     RMDemuxContext *rm = s->priv_data;
00556     AVIOContext *pb = s->pb;
00557     AVStream *st;
00558     uint32_t state=0xFFFFFFFF;
00559 
00560     while(!url_feof(pb)){
00561         int len, num, i;
00562         *pos= avio_tell(pb) - 3;
00563         if(rm->remaining_len > 0){
00564             num= rm->current_stream;
00565             len= rm->remaining_len;
00566             *timestamp = AV_NOPTS_VALUE;
00567             *flags= 0;
00568         }else{
00569             state= (state<<8) + avio_r8(pb);
00570 
00571             if(state == MKBETAG('I', 'N', 'D', 'X')){
00572                 int n_pkts, expected_len;
00573                 len = avio_rb32(pb);
00574                 avio_skip(pb, 2);
00575                 n_pkts = avio_rb32(pb);
00576                 expected_len = 20 + n_pkts * 14;
00577                 if (len == 20)
00578                     /* some files don't add index entries to chunk size... */
00579                     len = expected_len;
00580                 else if (len != expected_len)
00581                     av_log(s, AV_LOG_WARNING,
00582                            "Index size %d (%d pkts) is wrong, should be %d.\n",
00583                            len, n_pkts, expected_len);
00584                 len -= 14; // we already read part of the index header
00585                 if(len<0)
00586                     continue;
00587                 goto skip;
00588             } else if (state == MKBETAG('D','A','T','A')) {
00589                 av_log(s, AV_LOG_WARNING,
00590                        "DATA tag in middle of chunk, file may be broken.\n");
00591             }
00592 
00593             if(state > (unsigned)0xFFFF || state <= 12)
00594                 continue;
00595             len=state - 12;
00596             state= 0xFFFFFFFF;
00597 
00598             num = avio_rb16(pb);
00599             *timestamp = avio_rb32(pb);
00600             avio_r8(pb); /* reserved */
00601             *flags = avio_r8(pb); /* flags */
00602         }
00603         for(i=0;i<s->nb_streams;i++) {
00604             st = s->streams[i];
00605             if (num == st->id)
00606                 break;
00607         }
00608         if (i == s->nb_streams) {
00609 skip:
00610             /* skip packet if unknown number */
00611             avio_skip(pb, len);
00612             rm->remaining_len = 0;
00613             continue;
00614         }
00615         *stream_index= i;
00616 
00617         return len;
00618     }
00619     return -1;
00620 }
00621 
00622 static int rm_assemble_video_frame(AVFormatContext *s, AVIOContext *pb,
00623                                    RMDemuxContext *rm, RMStream *vst,
00624                                    AVPacket *pkt, int len, int *pseq,
00625                                    int64_t *timestamp)
00626 {
00627     int hdr, seq, pic_num, len2, pos;
00628     int type;
00629 
00630     hdr = avio_r8(pb); len--;
00631     type = hdr >> 6;
00632 
00633     if(type != 3){  // not frame as a part of packet
00634         seq = avio_r8(pb); len--;
00635     }
00636     if(type != 1){  // not whole frame
00637         len2 = get_num(pb, &len);
00638         pos  = get_num(pb, &len);
00639         pic_num = avio_r8(pb); len--;
00640     }
00641     if(len<0)
00642         return -1;
00643     rm->remaining_len = len;
00644     if(type&1){     // frame, not slice
00645         if(type == 3){  // frame as a part of packet
00646             len= len2;
00647             *timestamp = pos;
00648         }
00649         if(rm->remaining_len < len)
00650             return -1;
00651         rm->remaining_len -= len;
00652         if(av_new_packet(pkt, len + 9) < 0)
00653             return AVERROR(EIO);
00654         pkt->data[0] = 0;
00655         AV_WL32(pkt->data + 1, 1);
00656         AV_WL32(pkt->data + 5, 0);
00657         avio_read(pb, pkt->data + 9, len);
00658         return 0;
00659     }
00660     //now we have to deal with single slice
00661 
00662     *pseq = seq;
00663     if((seq & 0x7F) == 1 || vst->curpic_num != pic_num){
00664         vst->slices = ((hdr & 0x3F) << 1) + 1;
00665         vst->videobufsize = len2 + 8*vst->slices + 1;
00666         av_free_packet(&vst->pkt); //FIXME this should be output.
00667         if(av_new_packet(&vst->pkt, vst->videobufsize) < 0)
00668             return AVERROR(ENOMEM);
00669         vst->videobufpos = 8*vst->slices + 1;
00670         vst->cur_slice = 0;
00671         vst->curpic_num = pic_num;
00672         vst->pktpos = avio_tell(pb);
00673     }
00674     if(type == 2)
00675         len = FFMIN(len, pos);
00676 
00677     if(++vst->cur_slice > vst->slices)
00678         return 1;
00679     AV_WL32(vst->pkt.data - 7 + 8*vst->cur_slice, 1);
00680     AV_WL32(vst->pkt.data - 3 + 8*vst->cur_slice, vst->videobufpos - 8*vst->slices - 1);
00681     if(vst->videobufpos + len > vst->videobufsize)
00682         return 1;
00683     if (avio_read(pb, vst->pkt.data + vst->videobufpos, len) != len)
00684         return AVERROR(EIO);
00685     vst->videobufpos += len;
00686     rm->remaining_len-= len;
00687 
00688     if (type == 2 || vst->videobufpos == vst->videobufsize) {
00689         vst->pkt.data[0] = vst->cur_slice-1;
00690         *pkt= vst->pkt;
00691         vst->pkt.data= NULL;
00692         vst->pkt.size= 0;
00693         if(vst->slices != vst->cur_slice) //FIXME find out how to set slices correct from the begin
00694             memmove(pkt->data + 1 + 8*vst->cur_slice, pkt->data + 1 + 8*vst->slices,
00695                 vst->videobufpos - 1 - 8*vst->slices);
00696         pkt->size = vst->videobufpos + 8*(vst->cur_slice - vst->slices);
00697         pkt->pts = AV_NOPTS_VALUE;
00698         pkt->pos = vst->pktpos;
00699         vst->slices = 0;
00700         return 0;
00701     }
00702 
00703     return 1;
00704 }
00705 
00706 static inline void
00707 rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt)
00708 {
00709     uint8_t *ptr;
00710     int j;
00711 
00712     if (st->codec->codec_id == CODEC_ID_AC3) {
00713         ptr = pkt->data;
00714         for (j=0;j<pkt->size;j+=2) {
00715             FFSWAP(int, ptr[0], ptr[1]);
00716             ptr += 2;
00717         }
00718     }
00719 }
00720 
00725 void ff_rm_reorder_sipr_data(uint8_t *buf, int sub_packet_h, int framesize)
00726 {
00727     int n, bs = sub_packet_h * framesize * 2 / 96; // nibbles per subpacket
00728 
00729     for (n = 0; n < 38; n++) {
00730         int j;
00731         int i = bs * sipr_swaps[n][0];
00732         int o = bs * sipr_swaps[n][1];
00733 
00734         /* swap 4bit-nibbles of block 'i' with 'o' */
00735         for (j = 0; j < bs; j++, i++, o++) {
00736             int x = (buf[i >> 1] >> (4 * (i & 1))) & 0xF,
00737                 y = (buf[o >> 1] >> (4 * (o & 1))) & 0xF;
00738 
00739             buf[o >> 1] = (x << (4 * (o & 1))) |
00740                 (buf[o >> 1] & (0xF << (4 * !(o & 1))));
00741             buf[i >> 1] = (y << (4 * (i & 1))) |
00742                 (buf[i >> 1] & (0xF << (4 * !(i & 1))));
00743         }
00744     }
00745 }
00746 
00747 int
00748 ff_rm_parse_packet (AVFormatContext *s, AVIOContext *pb,
00749                     AVStream *st, RMStream *ast, int len, AVPacket *pkt,
00750                     int *seq, int flags, int64_t timestamp)
00751 {
00752     RMDemuxContext *rm = s->priv_data;
00753 
00754     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
00755         rm->current_stream= st->id;
00756         if(rm_assemble_video_frame(s, pb, rm, ast, pkt, len, seq, &timestamp))
00757             return -1; //got partial frame
00758     } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
00759         if ((ast->deint_id == DEINT_ID_GENR) ||
00760             (ast->deint_id == DEINT_ID_INT4) ||
00761             (ast->deint_id == DEINT_ID_SIPR)) {
00762             int x;
00763             int sps = ast->sub_packet_size;
00764             int cfs = ast->coded_framesize;
00765             int h = ast->sub_packet_h;
00766             int y = ast->sub_packet_cnt;
00767             int w = ast->audio_framesize;
00768 
00769             if (flags & 2)
00770                 y = ast->sub_packet_cnt = 0;
00771             if (!y)
00772                 ast->audiotimestamp = timestamp;
00773 
00774             switch (ast->deint_id) {
00775                 case DEINT_ID_INT4:
00776                     for (x = 0; x < h/2; x++)
00777                         avio_read(pb, ast->pkt.data+x*2*w+y*cfs, cfs);
00778                     break;
00779                 case DEINT_ID_GENR:
00780                     for (x = 0; x < w/sps; x++)
00781                         avio_read(pb, ast->pkt.data+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
00782                     break;
00783                 case DEINT_ID_SIPR:
00784                     avio_read(pb, ast->pkt.data + y * w, w);
00785                     break;
00786             }
00787 
00788             if (++(ast->sub_packet_cnt) < h)
00789                 return -1;
00790             if (ast->deint_id == DEINT_ID_SIPR)
00791                 ff_rm_reorder_sipr_data(ast->pkt.data, h, w);
00792 
00793              ast->sub_packet_cnt = 0;
00794              rm->audio_stream_num = st->index;
00795              rm->audio_pkt_cnt = h * w / st->codec->block_align;
00796         } else if ((ast->deint_id == DEINT_ID_VBRF) ||
00797                    (ast->deint_id == DEINT_ID_VBRS)) {
00798             int x;
00799             rm->audio_stream_num = st->index;
00800             ast->sub_packet_cnt = (avio_rb16(pb) & 0xf0) >> 4;
00801             if (ast->sub_packet_cnt) {
00802                 for (x = 0; x < ast->sub_packet_cnt; x++)
00803                     ast->sub_packet_lengths[x] = avio_rb16(pb);
00804                 rm->audio_pkt_cnt = ast->sub_packet_cnt;
00805                 ast->audiotimestamp = timestamp;
00806             } else
00807                 return -1;
00808         } else {
00809             av_get_packet(pb, pkt, len);
00810             rm_ac3_swap_bytes(st, pkt);
00811         }
00812     } else
00813         av_get_packet(pb, pkt, len);
00814 
00815     pkt->stream_index = st->index;
00816 
00817 #if 0
00818     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
00819         if(st->codec->codec_id == CODEC_ID_RV20){
00820             int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
00821             av_log(s, AV_LOG_DEBUG, "%d %"PRId64" %d\n", *timestamp, *timestamp*512LL/25, seq);
00822 
00823             seq |= (timestamp&~0x3FFF);
00824             if(seq - timestamp >  0x2000) seq -= 0x4000;
00825             if(seq - timestamp < -0x2000) seq += 0x4000;
00826         }
00827     }
00828 #endif
00829 
00830     pkt->pts = timestamp;
00831     if (flags & 2)
00832         pkt->flags |= AV_PKT_FLAG_KEY;
00833 
00834     return st->codec->codec_type == AVMEDIA_TYPE_AUDIO ? rm->audio_pkt_cnt : 0;
00835 }
00836 
00837 int
00838 ff_rm_retrieve_cache (AVFormatContext *s, AVIOContext *pb,
00839                       AVStream *st, RMStream *ast, AVPacket *pkt)
00840 {
00841     RMDemuxContext *rm = s->priv_data;
00842 
00843     assert (rm->audio_pkt_cnt > 0);
00844 
00845     if (ast->deint_id == DEINT_ID_VBRF ||
00846         ast->deint_id == DEINT_ID_VBRS)
00847         av_get_packet(pb, pkt, ast->sub_packet_lengths[ast->sub_packet_cnt - rm->audio_pkt_cnt]);
00848     else {
00849         av_new_packet(pkt, st->codec->block_align);
00850         memcpy(pkt->data, ast->pkt.data + st->codec->block_align * //FIXME avoid this
00851                (ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
00852                st->codec->block_align);
00853     }
00854     rm->audio_pkt_cnt--;
00855     if ((pkt->pts = ast->audiotimestamp) != AV_NOPTS_VALUE) {
00856         ast->audiotimestamp = AV_NOPTS_VALUE;
00857         pkt->flags = AV_PKT_FLAG_KEY;
00858     } else
00859         pkt->flags = 0;
00860     pkt->stream_index = st->index;
00861 
00862     return rm->audio_pkt_cnt;
00863 }
00864 
00865 static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
00866 {
00867     RMDemuxContext *rm = s->priv_data;
00868     AVStream *st;
00869     int i, len, res, seq = 1;
00870     int64_t timestamp, pos;
00871     int flags;
00872 
00873     for (;;) {
00874         if (rm->audio_pkt_cnt) {
00875             // If there are queued audio packet return them first
00876             st = s->streams[rm->audio_stream_num];
00877             ff_rm_retrieve_cache(s, s->pb, st, st->priv_data, pkt);
00878             flags = 0;
00879         } else {
00880             if (rm->old_format) {
00881                 RMStream *ast;
00882 
00883                 st = s->streams[0];
00884                 ast = st->priv_data;
00885                 timestamp = AV_NOPTS_VALUE;
00886                 len = !ast->audio_framesize ? RAW_PACKET_SIZE :
00887                     ast->coded_framesize * ast->sub_packet_h / 2;
00888                 flags = (seq++ == 1) ? 2 : 0;
00889                 pos = avio_tell(s->pb);
00890             } else {
00891                 len=sync(s, &timestamp, &flags, &i, &pos);
00892                 if (len > 0)
00893                     st = s->streams[i];
00894             }
00895 
00896             if(len<0 || url_feof(s->pb))
00897                 return AVERROR(EIO);
00898 
00899             res = ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,
00900                                       &seq, flags, timestamp);
00901             if((flags&2) && (seq&0x7F) == 1)
00902                 av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
00903             if (res)
00904                 continue;
00905         }
00906 
00907         if(  (st->discard >= AVDISCARD_NONKEY && !(flags&2))
00908            || st->discard >= AVDISCARD_ALL){
00909             av_free_packet(pkt);
00910         } else
00911             break;
00912     }
00913 
00914     return 0;
00915 }
00916 
00917 static int rm_read_close(AVFormatContext *s)
00918 {
00919     int i;
00920 
00921     for (i=0;i<s->nb_streams;i++)
00922         ff_rm_free_rmstream(s->streams[i]->priv_data);
00923 
00924     return 0;
00925 }
00926 
00927 static int rm_probe(AVProbeData *p)
00928 {
00929     /* check file header */
00930     if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
00931          p->buf[2] == 'M' && p->buf[3] == 'F' &&
00932          p->buf[4] == 0 && p->buf[5] == 0) ||
00933         (p->buf[0] == '.' && p->buf[1] == 'r' &&
00934          p->buf[2] == 'a' && p->buf[3] == 0xfd))
00935         return AVPROBE_SCORE_MAX;
00936     else
00937         return 0;
00938 }
00939 
00940 static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
00941                                int64_t *ppos, int64_t pos_limit)
00942 {
00943     RMDemuxContext *rm = s->priv_data;
00944     int64_t pos, dts;
00945     int stream_index2, flags, len, h;
00946 
00947     pos = *ppos;
00948 
00949     if(rm->old_format)
00950         return AV_NOPTS_VALUE;
00951 
00952     if (avio_seek(s->pb, pos, SEEK_SET) < 0)
00953         return AV_NOPTS_VALUE;
00954 
00955     rm->remaining_len=0;
00956     for(;;){
00957         int seq=1;
00958         AVStream *st;
00959 
00960         len=sync(s, &dts, &flags, &stream_index2, &pos);
00961         if(len<0)
00962             return AV_NOPTS_VALUE;
00963 
00964         st = s->streams[stream_index2];
00965         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
00966             h= avio_r8(s->pb); len--;
00967             if(!(h & 0x40)){
00968                 seq = avio_r8(s->pb); len--;
00969             }
00970         }
00971 
00972         if((flags&2) && (seq&0x7F) == 1){
00973 //            av_log(s, AV_LOG_DEBUG, "%d %d-%d %"PRId64" %d\n", flags, stream_index2, stream_index, dts, seq);
00974             av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);
00975             if(stream_index2 == stream_index)
00976                 break;
00977         }
00978 
00979         avio_skip(s->pb, len);
00980     }
00981     *ppos = pos;
00982     return dts;
00983 }
00984 
00985 AVInputFormat ff_rm_demuxer = {
00986     .name           = "rm",
00987     .long_name      = NULL_IF_CONFIG_SMALL("RealMedia format"),
00988     .priv_data_size = sizeof(RMDemuxContext),
00989     .read_probe     = rm_probe,
00990     .read_header    = rm_read_header,
00991     .read_packet    = rm_read_packet,
00992     .read_close     = rm_read_close,
00993     .read_timestamp = rm_read_dts,
00994 };
00995 
00996 AVInputFormat ff_rdt_demuxer = {
00997     .name           = "rdt",
00998     .long_name      = NULL_IF_CONFIG_SMALL("RDT demuxer"),
00999     .priv_data_size = sizeof(RMDemuxContext),
01000     .read_close     = rm_read_close,
01001     .flags          = AVFMT_NOFILE,
01002 };