rmdec.c 31.6 KB
Newer Older
Fabrice Bellard's avatar
Fabrice Bellard committed
1
/*
2
 * "Real" compatible demuxer.
3
 * Copyright (c) 2000, 2001 Fabrice Bellard
Fabrice Bellard's avatar
Fabrice Bellard committed
4
 *
5
 * This file is part of Libav.
6
 *
7
 * Libav is free software; you can redistribute it and/or
8 9
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
Fabrice Bellard's avatar
Fabrice Bellard committed
11
 *
12
 * Libav is distributed in the hope that it will be useful,
Fabrice Bellard's avatar
Fabrice Bellard committed
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
Fabrice Bellard's avatar
Fabrice Bellard committed
16
 *
17
 * You should have received a copy of the GNU Lesser General Public
18
 * License along with Libav; if not, write to the Free Software
19
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Fabrice Bellard's avatar
Fabrice Bellard committed
20
 */
21

22 23
#include <inttypes.h>

24
#include "libavutil/avstring.h"
25
#include "libavutil/channel_layout.h"
26
#include "libavutil/internal.h"
27
#include "libavutil/intreadwrite.h"
28
#include "libavutil/dict.h"
Fabrice Bellard's avatar
Fabrice Bellard committed
29
#include "avformat.h"
30
#include "internal.h"
31
#include "rmsipr.h"
32
#include "rm.h"
33

34
#define DEINT_ID_GENR MKTAG('g', 'e', 'n', 'r') ///< interleaving for Cooker/ATRAC
35 36 37 38 39 40
#define DEINT_ID_INT0 MKTAG('I', 'n', 't', '0') ///< no interleaving needed
#define DEINT_ID_INT4 MKTAG('I', 'n', 't', '4') ///< interleaving for 28.8
#define DEINT_ID_SIPR MKTAG('s', 'i', 'p', 'r') ///< interleaving for Sipro
#define DEINT_ID_VBRF MKTAG('v', 'b', 'r', 'f') ///< VBR case for AAC
#define DEINT_ID_VBRS MKTAG('v', 'b', 'r', 's') ///< VBR case for AAC

41
struct RMStream {
42
    AVPacket pkt;      ///< place to store merged video frame / reordered audio data
43 44 45 46 47 48 49 50 51
    int videobufsize;  ///< current assembled frame size
    int videobufpos;   ///< position for the next slice in the video buffer
    int curpic_num;    ///< picture number of current frame
    int cur_slice, slices;
    int64_t pktpos;    ///< first slice position in file
    /// Audio descrambling matrix parameters
    int64_t audiotimestamp; ///< Audio packet timestamp
    int sub_packet_cnt; // Subpacket counter, used while reading
    int sub_packet_size, sub_packet_h, coded_framesize; ///< Descrambling parameters from container
52 53
    int audio_framesize; /// Audio frame size from container
    int sub_packet_lengths[16]; /// Length of each subpacket
54
    int32_t deint_id;  ///< deinterleaver used in audio stream
55 56
};

57
typedef struct RMDemuxContext {
58 59 60 61
    int nb_packets;
    int old_format;
    int current_stream;
    int remaining_len;
62 63 64
    int audio_stream_num; ///< Stream number for audio packets
    int audio_pkt_cnt; ///< Output packet counter
} RMDemuxContext;
Fabrice Bellard's avatar
Fabrice Bellard committed
65

66
static inline void get_strl(AVIOContext *pb, char *buf, int buf_size, int len)
Fabrice Bellard's avatar
Fabrice Bellard committed
67
{
68
    int i;
69
    char *q, r;
Fabrice Bellard's avatar
Fabrice Bellard committed
70 71 72

    q = buf;
    for(i=0;i<len;i++) {
73
        r = avio_r8(pb);
Fabrice Bellard's avatar
Fabrice Bellard committed
74
        if (i < buf_size - 1)
75
            *q++ = r;
Fabrice Bellard's avatar
Fabrice Bellard committed
76
    }
77
    if (buf_size > 0) *q = '\0';
Fabrice Bellard's avatar
Fabrice Bellard committed
78 79
}

80
static void get_str8(AVIOContext *pb, char *buf, int buf_size)
81
{
82
    get_strl(pb, buf, buf_size, avio_r8(pb));
Fabrice Bellard's avatar
Fabrice Bellard committed
83 84
}

85
static int rm_read_extradata(AVIOContext *pb, AVCodecParameters *par, unsigned size)
86 87 88
{
    if (size >= 1<<24)
        return -1;
89 90
    par->extradata = av_mallocz(size + AV_INPUT_BUFFER_PADDING_SIZE);
    if (!par->extradata)
91
        return AVERROR(ENOMEM);
92 93
    par->extradata_size = avio_read(pb, par->extradata, size);
    if (par->extradata_size != size)
94 95 96 97
        return AVERROR(EIO);
    return 0;
}

98
static void rm_read_metadata(AVFormatContext *s, AVIOContext *pb, int wide)
99 100 101 102
{
    char buf[1024];
    int i;
    for (i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
103 104
        int len = wide ? avio_rb16(pb) : avio_r8(pb);
        get_strl(pb, buf, sizeof(buf), len);
105
        av_dict_set(&s->metadata, ff_rm_metadata[i], buf, 0);
106 107 108
    }
}

109 110 111
RMStream *ff_rm_alloc_rmstream (void)
{
    RMStream *rms = av_mallocz(sizeof(RMStream));
112 113
    if (!rms)
        return NULL;
114 115 116 117 118 119
    rms->curpic_num = -1;
    return rms;
}

void ff_rm_free_rmstream (RMStream *rms)
{
120
    av_packet_unref(&rms->pkt);
121 122
}

123
static int rm_read_audio_stream_info(AVFormatContext *s, AVIOContext *pb,
124
                                     AVStream *st, RMStream *ast, int read_all)
125
{
126
    char buf[256];
127
    uint32_t version;
128
    int ret;
129 130

    /* ra type header */
131
    version = avio_rb16(pb); /* version */
132
    if (version == 3) {
133
        int header_size = avio_rb16(pb);
134
        int64_t startpos = avio_tell(pb);
135
        avio_skip(pb, 14);
136
        rm_read_metadata(s, pb, 0);
137
        if ((startpos + header_size) >= avio_tell(pb) + 2) {
Ronald S. Bultje's avatar
Ronald S. Bultje committed
138
            // fourcc (should always be "lpcJ")
139
            avio_r8(pb);
Ronald S. Bultje's avatar
Ronald S. Bultje committed
140
            get_str8(pb, buf, sizeof(buf));
141 142
        }
        // Skip extra header crap (this should never happen)
143
        if ((startpos + header_size) > avio_tell(pb))
144
            avio_skip(pb, header_size + startpos - avio_tell(pb));
145 146 147 148 149
        st->codecpar->sample_rate = 8000;
        st->codecpar->channels = 1;
        st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
        st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
        st->codecpar->codec_id = AV_CODEC_ID_RA_144;
150
        ast->deint_id = DEINT_ID_INT0;
151
    } else {
152
        int flavor, sub_packet_h, coded_framesize, sub_packet_size;
153
        int codecdata_length;
154
        /* old version (4) */
155
        avio_skip(pb, 2); /* unused */
156 157 158 159 160 161 162 163 164 165
        avio_rb32(pb); /* .ra4 */
        avio_rb32(pb); /* data size */
        avio_rb16(pb); /* version2 */
        avio_rb32(pb); /* header size */
        flavor= avio_rb16(pb); /* add codec info / flavor */
        ast->coded_framesize = coded_framesize = avio_rb32(pb); /* coded frame size */
        avio_rb32(pb); /* ??? */
        avio_rb32(pb); /* ??? */
        avio_rb32(pb); /* ??? */
        ast->sub_packet_h = sub_packet_h = avio_rb16(pb); /* 1 */
166
        st->codecpar->block_align= avio_rb16(pb); /* frame size */
167 168
        ast->sub_packet_size = sub_packet_size = avio_rb16(pb); /* sub packet size */
        avio_rb16(pb); /* ??? */
169
        if (version == 5) {
170
            avio_rb16(pb); avio_rb16(pb); avio_rb16(pb);
171
        }
172
        st->codecpar->sample_rate = avio_rb16(pb);
173
        avio_rb32(pb);
174
        st->codecpar->channels = avio_rb16(pb);
175
        if (version == 5) {
176
            ast->deint_id = avio_rl32(pb);
177
            avio_read(pb, buf, 4);
178 179
            buf[4] = 0;
        } else {
180
            get_str8(pb, buf, sizeof(buf)); /* desc */
181
            ast->deint_id = AV_RL32(buf);
182
            get_str8(pb, buf, sizeof(buf)); /* desc */
183
        }
184 185 186 187
        st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
        st->codecpar->codec_tag  = AV_RL32(buf);
        st->codecpar->codec_id   = ff_codec_get_id(ff_rm_codec_tags,
                                                   st->codecpar->codec_tag);
188

189
        switch (st->codecpar->codec_id) {
190
        case AV_CODEC_ID_AC3:
191
            st->need_parsing = AVSTREAM_PARSE_FULL;
192
            break;
193
        case AV_CODEC_ID_RA_288:
194 195 196
            st->codecpar->extradata_size= 0;
            ast->audio_framesize = st->codecpar->block_align;
            st->codecpar->block_align = coded_framesize;
197
            break;
198
        case AV_CODEC_ID_COOK:
199
            st->need_parsing = AVSTREAM_PARSE_HEADERS;
200 201
        case AV_CODEC_ID_ATRAC3:
        case AV_CODEC_ID_SIPR:
202
            avio_rb16(pb); avio_r8(pb);
203
            if (version == 5)
204 205
                avio_r8(pb);
            codecdata_length = avio_rb32(pb);
206
            if(codecdata_length + AV_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
207 208 209 210
                av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
                return -1;
            }

211 212
            ast->audio_framesize = st->codecpar->block_align;
            if (st->codecpar->codec_id == AV_CODEC_ID_SIPR) {
213 214 215 216 217
                if (flavor > 3) {
                    av_log(s, AV_LOG_ERROR, "bad SIPR file flavor %d\n",
                           flavor);
                    return -1;
                }
218
                st->codecpar->block_align = ff_sipr_subpk_size[flavor];
219 220 221 222 223
            } else {
                if(sub_packet_size <= 0){
                    av_log(s, AV_LOG_ERROR, "sub_packet_size is invalid\n");
                    return -1;
                }
224
                st->codecpar->block_align = ast->sub_packet_size;
225
            }
226
            if ((ret = rm_read_extradata(pb, st->codecpar, codecdata_length)) < 0)
227
                return ret;
228
            break;
229
        case AV_CODEC_ID_AAC:
230
            avio_rb16(pb); avio_r8(pb);
231
            if (version == 5)
232 233
                avio_r8(pb);
            codecdata_length = avio_rb32(pb);
234
            if(codecdata_length + AV_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
235 236 237
                av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
                return -1;
            }
238
            if (codecdata_length >= 1) {
239
                avio_r8(pb);
240
                if ((ret = rm_read_extradata(pb, st->codecpar, codecdata_length - 1)) < 0)
241
                    return ret;
242
            }
243
            break;
244
        }
245 246 247
        if (ast->deint_id == DEINT_ID_INT4 ||
            ast->deint_id == DEINT_ID_GENR ||
            ast->deint_id == DEINT_ID_SIPR) {
248
            if (st->codecpar->block_align <= 0 ||
249
                ast->audio_framesize * sub_packet_h > (unsigned)INT_MAX ||
250
                ast->audio_framesize * sub_packet_h < st->codecpar->block_align)
251 252 253 254 255 256 257
                return AVERROR_INVALIDDATA;
            if (av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h) < 0)
                return AVERROR(ENOMEM);
        }
        switch (ast->deint_id) {
        case DEINT_ID_INT4:
            if (ast->coded_framesize > ast->audio_framesize ||
258
                sub_packet_h <= 1 ||
259 260 261 262 263 264 265 266 267 268 269 270 271 272
                ast->coded_framesize * sub_packet_h > (2 + (sub_packet_h & 1)) * ast->audio_framesize)
                return AVERROR_INVALIDDATA;
            break;
        case DEINT_ID_GENR:
            if (ast->sub_packet_size <= 0 ||
                ast->sub_packet_size > ast->audio_framesize)
                return AVERROR_INVALIDDATA;
            break;
        case DEINT_ID_SIPR:
        case DEINT_ID_INT0:
        case DEINT_ID_VBRS:
        case DEINT_ID_VBRF:
            break;
        default:
273
            av_log(NULL, 0 ,"Unknown interleaver %"PRIX32"\n", ast->deint_id);
274 275 276
            return AVERROR_INVALIDDATA;
        }

277
        if (read_all) {
278 279 280
            avio_r8(pb);
            avio_r8(pb);
            avio_r8(pb);
281
            rm_read_metadata(s, pb, 0);
282 283
        }
    }
284
    return 0;
285 286
}

287 288 289
int ff_rm_read_mdpr_codecdata(AVFormatContext *s, AVIOContext *pb,
                              AVStream *st, RMStream *rst,
                              unsigned int codec_data_size)
290 291
{
    unsigned int v;
292
    int size;
293
    int64_t codec_pos;
294
    int ret;
295

296
    avpriv_set_pts_info(st, 64, 1, 1000);
297
    codec_pos = avio_tell(pb);
298
    v = avio_rb32(pb);
299 300
    if (v == MKTAG(0xfd, 'a', 'r', '.')) {
        /* ra type header */
301
        if (rm_read_audio_stream_info(s, pb, st, rst, 0))
302
            return -1;
303 304
    } else if (v == MKBETAG('L', 'S', 'D', ':')) {
        avio_seek(pb, -4, SEEK_CUR);
305
        if ((ret = rm_read_extradata(pb, st->codecpar, codec_data_size)) < 0)
306 307
            return ret;

308 309 310 311
        st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
        st->codecpar->codec_tag  = AV_RL32(st->codecpar->extradata);
        st->codecpar->codec_id   = ff_codec_get_id(ff_rm_codec_tags,
                                                   st->codecpar->codec_tag);
312
    } else {
Mans Rullgard's avatar
Mans Rullgard committed
313
        int fps;
314
        if (avio_rl32(pb) != MKTAG('V', 'I', 'D', 'O')) {
315
        fail1:
316
            av_log(s, AV_LOG_WARNING, "Unsupported stream type %08x\n", v);
317 318
            goto skip;
        }
319 320 321 322 323
        st->codecpar->codec_tag = avio_rl32(pb);
        st->codecpar->codec_id  = ff_codec_get_id(ff_rm_codec_tags,
                                                  st->codecpar->codec_tag);
        av_log(s, AV_LOG_TRACE, "%X %X\n", st->codecpar->codec_tag, MKTAG('R', 'V', '2', '0'));
        if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
324
            goto fail1;
325 326
        st->codecpar->width  = avio_rb16(pb);
        st->codecpar->height = avio_rb16(pb);
327 328
        avio_skip(pb, 2); // looks like bits per sample
        avio_skip(pb, 4); // always zero?
329
        st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
330
        st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
331
        fps = avio_rb32(pb);
332

333
        if ((ret = rm_read_extradata(pb, st->codecpar, codec_data_size - (avio_tell(pb) - codec_pos))) < 0)
334
            return ret;
335

336 337 338 339 340 341 342
        if (fps > 0) {
            av_reduce(&st->avg_frame_rate.den, &st->avg_frame_rate.num,
                      0x10000, fps, (1 << 30) - 1);
        } else if (s->error_recognition & AV_EF_EXPLODE) {
            av_log(s, AV_LOG_ERROR, "Invalid framerate\n");
            return AVERROR_INVALIDDATA;
        }
343 344 345 346
    }

skip:
    /* skip codec info */
347
    size = avio_tell(pb) - codec_pos;
348
    avio_skip(pb, codec_data_size - size);
349

350
    return 0;
351 352
}

353 354 355 356
/** this function assumes that the demuxer has already seeked to the start
 * of the INDX chunk, and will bail out if not. */
static int rm_read_index(AVFormatContext *s)
{
357
    AVIOContext *pb = s->pb;
358 359 360 361
    unsigned int size, n_pkts, str_id, next_off, n, pos, pts;
    AVStream *st;

    do {
362
        if (avio_rl32(pb) != MKTAG('I','N','D','X'))
363
            return -1;
364
        size     = avio_rb32(pb);
365 366
        if (size < 20)
            return -1;
367
        avio_skip(pb, 2);
368 369 370
        n_pkts   = avio_rb32(pb);
        str_id   = avio_rb16(pb);
        next_off = avio_rb32(pb);
371 372 373 374 375
        for (n = 0; n < s->nb_streams; n++)
            if (s->streams[n]->id == str_id) {
                st = s->streams[n];
                break;
            }
376 377 378 379
        if (n == s->nb_streams) {
            av_log(s, AV_LOG_ERROR,
                   "Invalid stream index %d for index at pos %"PRId64"\n",
                   str_id, avio_tell(pb));
380
            goto skip;
381 382 383
        } else if ((avio_size(pb) - avio_tell(pb)) / 14 < n_pkts) {
            av_log(s, AV_LOG_ERROR,
                   "Nr. of packets in packet index for stream index %d "
384
                   "exceeds filesize (%"PRId64" at %"PRId64" = %"PRId64")\n",
385 386 387 388
                   str_id, avio_size(pb), avio_tell(pb),
                   (avio_size(pb) - avio_tell(pb)) / 14);
            goto skip;
        }
389 390

        for (n = 0; n < n_pkts; n++) {
391
            avio_skip(pb, 2);
392 393
            pts = avio_rb32(pb);
            pos = avio_rb32(pb);
394
            avio_skip(pb, 4); /* packet no. */
395 396 397 398 399

            av_add_index_entry(st, pos, pts, 0, 0, AVINDEX_KEYFRAME);
        }

skip:
400 401 402 403
        if (next_off && avio_tell(pb) < next_off &&
            avio_seek(pb, next_off, SEEK_SET) < 0) {
            av_log(s, AV_LOG_ERROR,
                   "Non-linear index detected, not supported\n");
404
            return -1;
405
        }
406 407 408 409
    } while (next_off);

    return 0;
}
410

411
static int rm_read_header_old(AVFormatContext *s)
412
{
413
    RMDemuxContext *rm = s->priv_data;
414 415 416
    AVStream *st;

    rm->old_format = 1;
417
    st = avformat_new_stream(s, NULL);
418
    if (!st)
419
        return -1;
420
    st->priv_data = ff_rm_alloc_rmstream();
421 422
    if (!st->priv_data)
        return AVERROR(ENOMEM);
423
    return rm_read_audio_stream_info(s, s->pb, st, st->priv_data, 1);
424 425
}

426
static int rm_read_header(AVFormatContext *s)
Fabrice Bellard's avatar
Fabrice Bellard committed
427
{
428
    RMDemuxContext *rm = s->priv_data;
Fabrice Bellard's avatar
Fabrice Bellard committed
429
    AVStream *st;
430
    AVIOContext *pb = s->pb;
431
    unsigned int tag;
432
    int tag_size;
433
    unsigned int start_time, duration;
434
    unsigned int data_off = 0, indx_off = 0;
Fabrice Bellard's avatar
Fabrice Bellard committed
435
    char buf[128];
436
    int flags = 0;
Fabrice Bellard's avatar
Fabrice Bellard committed
437

438
    tag = avio_rl32(pb);
439 440
    if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
        /* very old .ra format */
441
        return rm_read_header_old(s);
442
    } else if (tag != MKTAG('.', 'R', 'M', 'F')) {
443
        return AVERROR(EIO);
444
    }
Fabrice Bellard's avatar
Fabrice Bellard committed
445

446 447
    tag_size = avio_rb32(pb);
    avio_skip(pb, tag_size - 8);
448

Fabrice Bellard's avatar
Fabrice Bellard committed
449
    for(;;) {
Anton Khirnov's avatar
Anton Khirnov committed
450
        if (pb->eof_reached)
451
            return -1;
452 453 454
        tag = avio_rl32(pb);
        tag_size = avio_rb32(pb);
        avio_rb16(pb);
455
        av_log(s, AV_LOG_TRACE, "tag=%c%c%c%c (%08x) size=%d\n",
456 457 458 459 460 461
                (tag      ) & 0xff,
                (tag >>  8) & 0xff,
                (tag >> 16) & 0xff,
                (tag >> 24) & 0xff,
                tag,
                tag_size);
462
        if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
463
            return -1;
Fabrice Bellard's avatar
Fabrice Bellard committed
464 465 466
        switch(tag) {
        case MKTAG('P', 'R', 'O', 'P'):
            /* file header */
467 468 469 470 471 472 473 474 475 476 477
            avio_rb32(pb); /* max bit rate */
            avio_rb32(pb); /* avg bit rate */
            avio_rb32(pb); /* max packet size */
            avio_rb32(pb); /* avg packet size */
            avio_rb32(pb); /* nb packets */
            avio_rb32(pb); /* duration */
            avio_rb32(pb); /* preroll */
            indx_off = avio_rb32(pb); /* index offset */
            data_off = avio_rb32(pb); /* data offset */
            avio_rb16(pb); /* nb streams */
            flags = avio_rb16(pb); /* flags */
Fabrice Bellard's avatar
Fabrice Bellard committed
478 479
            break;
        case MKTAG('C', 'O', 'N', 'T'):
480
            rm_read_metadata(s, pb, 1);
Fabrice Bellard's avatar
Fabrice Bellard committed
481 482
            break;
        case MKTAG('M', 'D', 'P', 'R'):
483
            st = avformat_new_stream(s, NULL);
Fabrice Bellard's avatar
Fabrice Bellard committed
484
            if (!st)
485
                return AVERROR(ENOMEM);
486 487
            st->id = avio_rb16(pb);
            avio_rb32(pb); /* max bit rate */
488
            st->codecpar->bit_rate = avio_rb32(pb); /* bit rate */
489 490 491 492 493
            avio_rb32(pb); /* max packet size */
            avio_rb32(pb); /* avg packet size */
            start_time = avio_rb32(pb); /* start time */
            avio_rb32(pb); /* preroll */
            duration = avio_rb32(pb); /* duration */
494 495
            st->start_time = start_time;
            st->duration = duration;
Fabrice Bellard's avatar
Fabrice Bellard committed
496 497
            get_str8(pb, buf, sizeof(buf)); /* desc */
            get_str8(pb, buf, sizeof(buf)); /* mimetype */
498
            st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
499
            st->priv_data = ff_rm_alloc_rmstream();
500 501
            if (!st->priv_data)
                return AVERROR(ENOMEM);
502
            if (ff_rm_read_mdpr_codecdata(s, s->pb, st, st->priv_data,
503
                                          avio_rb32(pb)) < 0)
504
                return -1;
Fabrice Bellard's avatar
Fabrice Bellard committed
505 506 507 508 509
            break;
        case MKTAG('D', 'A', 'T', 'A'):
            goto header_end;
        default:
            /* unknown tag: skip it */
510
            avio_skip(pb, tag_size - 10);
Fabrice Bellard's avatar
Fabrice Bellard committed
511 512 513 514
            break;
        }
    }
 header_end:
515
    rm->nb_packets = avio_rb32(pb); /* number of packets */
516 517
    if (!rm->nb_packets && (flags & 4))
        rm->nb_packets = 3600 * 25;
518
    avio_rb32(pb); /* next data header */
519 520

    if (!data_off)
521
        data_off = avio_tell(pb) - 18;
522 523
    if (indx_off && (pb->seekable & AVIO_SEEKABLE_NORMAL) &&
        !(s->flags & AVFMT_FLAG_IGNIDX) &&
524
        avio_seek(pb, indx_off, SEEK_SET) >= 0) {
525
        rm_read_index(s);
526
        avio_seek(pb, data_off + 18, SEEK_SET);
527 528
    }

Fabrice Bellard's avatar
Fabrice Bellard committed
529 530 531
    return 0;
}

532
static int get_num(AVIOContext *pb, int *len)
533 534 535
{
    int n, n1;

536
    n = avio_rb16(pb);
537
    (*len)-=2;
538
    n &= 0x7FFF;
539 540 541
    if (n >= 0x4000) {
        return n - 0x4000;
    } else {
542
        n1 = avio_rb16(pb);
543 544 545 546 547
        (*len)-=2;
        return (n << 16) | n1;
    }
}

548 549 550
/* multiple of 20 bytes for ra144 (ugly) */
#define RAW_PACKET_SIZE 1000

551
static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
552
    RMDemuxContext *rm = s->priv_data;
553
    AVIOContext *pb = s->pb;
Michael Niedermayer's avatar
Michael Niedermayer committed
554
    AVStream *st;
Michael Niedermayer's avatar
Michael Niedermayer committed
555
    uint32_t state=0xFFFFFFFF;
Michael Niedermayer's avatar
Michael Niedermayer committed
556

Anton Khirnov's avatar
Anton Khirnov committed
557
    while(!pb->eof_reached){
558
        int len, num, i;
559
        *pos= avio_tell(pb) - 3;
Michael Niedermayer's avatar
Michael Niedermayer committed
560 561 562 563 564 565
        if(rm->remaining_len > 0){
            num= rm->current_stream;
            len= rm->remaining_len;
            *timestamp = AV_NOPTS_VALUE;
            *flags= 0;
        }else{
566
            state= (state<<8) + avio_r8(pb);
567

Michael Niedermayer's avatar
Michael Niedermayer committed
568
            if(state == MKBETAG('I', 'N', 'D', 'X')){
569
                int n_pkts, expected_len;
570
                len = avio_rb32(pb);
571
                avio_skip(pb, 2);
572
                n_pkts = avio_rb32(pb);
573 574 575 576 577 578 579 580 581
                expected_len = 20 + n_pkts * 14;
                if (len == 20)
                    /* some files don't add index entries to chunk size... */
                    len = expected_len;
                else if (len != expected_len)
                    av_log(s, AV_LOG_WARNING,
                           "Index size %d (%d pkts) is wrong, should be %d.\n",
                           len, n_pkts, expected_len);
                len -= 14; // we already read part of the index header
Michael Niedermayer's avatar
Michael Niedermayer committed
582 583 584
                if(len<0)
                    continue;
                goto skip;
585 586 587
            } else if (state == MKBETAG('D','A','T','A')) {
                av_log(s, AV_LOG_WARNING,
                       "DATA tag in middle of chunk, file may be broken.\n");
Michael Niedermayer's avatar
Michael Niedermayer committed
588
            }
589

590
            if(state > (unsigned)0xFFFF || state <= 12)
Michael Niedermayer's avatar
Michael Niedermayer committed
591
                continue;
592
            len=state - 12;
Michael Niedermayer's avatar
Michael Niedermayer committed
593 594
            state= 0xFFFFFFFF;

595 596 597 598
            num = avio_rb16(pb);
            *timestamp = avio_rb32(pb);
            avio_r8(pb); /* reserved */
            *flags = avio_r8(pb); /* flags */
Michael Niedermayer's avatar
Michael Niedermayer committed
599 600 601 602 603 604 605
        }
        for(i=0;i<s->nb_streams;i++) {
            st = s->streams[i];
            if (num == st->id)
                break;
        }
        if (i == s->nb_streams) {
Michael Niedermayer's avatar
Michael Niedermayer committed
606
skip:
Michael Niedermayer's avatar
Michael Niedermayer committed
607
            /* skip packet if unknown number */
608
            avio_skip(pb, len);
609
            rm->remaining_len = 0;
Michael Niedermayer's avatar
Michael Niedermayer committed
610 611 612
            continue;
        }
        *stream_index= i;
613

Michael Niedermayer's avatar
Michael Niedermayer committed
614 615 616 617 618
        return len;
    }
    return -1;
}

619
static int rm_assemble_video_frame(AVFormatContext *s, AVIOContext *pb,
620
                                   RMDemuxContext *rm, RMStream *vst,
621 622
                                   AVPacket *pkt, int len, int *pseq,
                                   int64_t *timestamp)
623 624 625 626
{
    int hdr, seq, pic_num, len2, pos;
    int type;

627
    hdr = avio_r8(pb); len--;
628
    type = hdr >> 6;
629 630

    if(type != 3){  // not frame as a part of packet
631
        seq = avio_r8(pb); len--;
632 633
    }
    if(type != 1){  // not whole frame
634
        len2 = get_num(pb, &len);
635
        pos  = get_num(pb, &len);
636
        pic_num = avio_r8(pb); len--;
637 638 639 640 641
    }
    if(len<0)
        return -1;
    rm->remaining_len = len;
    if(type&1){     // frame, not slice
642
        if(type == 3){  // frame as a part of packet
643
            len= len2;
644 645
            *timestamp = pos;
        }
646
        if(rm->remaining_len < len)
647
            return -1;
648
        rm->remaining_len -= len;
649 650 651 652 653
        if(av_new_packet(pkt, len + 9) < 0)
            return AVERROR(EIO);
        pkt->data[0] = 0;
        AV_WL32(pkt->data + 1, 1);
        AV_WL32(pkt->data + 5, 0);
654
        avio_read(pb, pkt->data + 9, len);
655 656 657 658
        return 0;
    }
    //now we have to deal with single slice

659
    *pseq = seq;
660 661 662
    if((seq & 0x7F) == 1 || vst->curpic_num != pic_num){
        vst->slices = ((hdr & 0x3F) << 1) + 1;
        vst->videobufsize = len2 + 8*vst->slices + 1;
663
        av_packet_unref(&vst->pkt); //FIXME this should be output.
664
        if(av_new_packet(&vst->pkt, vst->videobufsize) < 0)
665
            return AVERROR(ENOMEM);
666 667 668
        vst->videobufpos = 8*vst->slices + 1;
        vst->cur_slice = 0;
        vst->curpic_num = pic_num;
669
        vst->pktpos = avio_tell(pb);
670
    }
Roberto Togni's avatar
Roberto Togni committed
671
    if(type == 2)
672 673
        len = FFMIN(len, pos);

674
    if(++vst->cur_slice > vst->slices)
675
        return 1;
676 677
    AV_WL32(vst->pkt.data - 7 + 8*vst->cur_slice, 1);
    AV_WL32(vst->pkt.data - 3 + 8*vst->cur_slice, vst->videobufpos - 8*vst->slices - 1);
678
    if(vst->videobufpos + len > vst->videobufsize)
679
        return 1;
680
    if (avio_read(pb, vst->pkt.data + vst->videobufpos, len) != len)
681
        return AVERROR(EIO);
682
    vst->videobufpos += len;
683 684
    rm->remaining_len-= len;

685
    if (type == 2 || vst->videobufpos == vst->videobufsize) {
686 687
        vst->pkt.data[0] = vst->cur_slice-1;
        *pkt= vst->pkt;
688
        vst->pkt.data= NULL;
689
        vst->pkt.size= 0;
690
        vst->pkt.buf = NULL;
691
        if(vst->slices != vst->cur_slice) //FIXME find out how to set slices correct from the begin
692
            memmove(pkt->data + 1 + 8*vst->cur_slice, pkt->data + 1 + 8*vst->slices,
693
                vst->videobufpos - 1 - 8*vst->slices);
694
        pkt->size = vst->videobufpos + 8*(vst->cur_slice - vst->slices);
695 696
        pkt->pts = AV_NOPTS_VALUE;
        pkt->pos = vst->pktpos;
697
        vst->slices = 0;
698
        return 0;
699 700 701 702 703
    }

    return 1;
}

704 705 706 707 708 709
static inline void
rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt)
{
    uint8_t *ptr;
    int j;

710
    if (st->codecpar->codec_id == AV_CODEC_ID_AC3) {
711 712 713 714 715 716 717 718
        ptr = pkt->data;
        for (j=0;j<pkt->size;j+=2) {
            FFSWAP(int, ptr[0], ptr[1]);
            ptr += 2;
        }
    }
}

719
int
720
ff_rm_parse_packet (AVFormatContext *s, AVIOContext *pb,
721
                    AVStream *st, RMStream *ast, int len, AVPacket *pkt,
722
                    int *seq, int flags, int64_t timestamp)
723
{
724
    RMDemuxContext *rm = s->priv_data;
725

726
    if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
727
        rm->current_stream= st->id;
728
        if(rm_assemble_video_frame(s, pb, rm, ast, pkt, len, seq, &timestamp))
729
            return -1; //got partial frame
730
    } else if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
731 732 733
        if ((ast->deint_id == DEINT_ID_GENR) ||
            (ast->deint_id == DEINT_ID_INT4) ||
            (ast->deint_id == DEINT_ID_SIPR)) {
734
            int x;
735 736 737 738 739
            int sps = ast->sub_packet_size;
            int cfs = ast->coded_framesize;
            int h = ast->sub_packet_h;
            int y = ast->sub_packet_cnt;
            int w = ast->audio_framesize;
740

741
            if (flags & 2)
742
                y = ast->sub_packet_cnt = 0;
743
            if (!y)
744
                ast->audiotimestamp = timestamp;
745

746 747
            switch (ast->deint_id) {
                case DEINT_ID_INT4:
748
                    for (x = 0; x < h/2; x++)
749
                        avio_read(pb, ast->pkt.data+x*2*w+y*cfs, cfs);
750
                    break;
751
                case DEINT_ID_GENR:
752
                    for (x = 0; x < w/sps; x++)
753
                        avio_read(pb, ast->pkt.data+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
754
                    break;
755
                case DEINT_ID_SIPR:
756
                    avio_read(pb, ast->pkt.data + y * w, w);
757
                    break;
758 759
            }

760
            if (++(ast->sub_packet_cnt) < h)
761
                return -1;
762
            if (ast->deint_id == DEINT_ID_SIPR)
763
                ff_rm_reorder_sipr_data(ast->pkt.data, h, w);
764

765 766
             ast->sub_packet_cnt = 0;
             rm->audio_stream_num = st->index;
767
             rm->audio_pkt_cnt = h * w / st->codecpar->block_align;
768 769
        } else if ((ast->deint_id == DEINT_ID_VBRF) ||
                   (ast->deint_id == DEINT_ID_VBRS)) {
770 771
            int x;
            rm->audio_stream_num = st->index;
772
            ast->sub_packet_cnt = (avio_rb16(pb) & 0xf0) >> 4;
773 774
            if (ast->sub_packet_cnt) {
                for (x = 0; x < ast->sub_packet_cnt; x++)
775
                    ast->sub_packet_lengths[x] = avio_rb16(pb);
776
                rm->audio_pkt_cnt = ast->sub_packet_cnt;
777
                ast->audiotimestamp = timestamp;
778 779
            } else
                return -1;
780
        } else {
781
            av_get_packet(pb, pkt, len);
782
            rm_ac3_swap_bytes(st, pkt);
783
        }
784 785 786 787 788
    } else
        av_get_packet(pb, pkt, len);

    pkt->stream_index = st->index;

789
    pkt->pts = timestamp;
790
    if (flags & 2)
791
        pkt->flags |= AV_PKT_FLAG_KEY;
792

793
    return st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO ? rm->audio_pkt_cnt : 0;
794 795
}

796
int
797
ff_rm_retrieve_cache (AVFormatContext *s, AVIOContext *pb,
798
                      AVStream *st, RMStream *ast, AVPacket *pkt)
799
{
800
    RMDemuxContext *rm = s->priv_data;
801 802 803

    assert (rm->audio_pkt_cnt > 0);

804 805
    if (ast->deint_id == DEINT_ID_VBRF ||
        ast->deint_id == DEINT_ID_VBRS)
806
        av_get_packet(pb, pkt, ast->sub_packet_lengths[ast->sub_packet_cnt - rm->audio_pkt_cnt]);
807
    else {
808
        int ret = av_new_packet(pkt, st->codecpar->block_align);
809 810
        if (ret < 0)
            return ret;
811 812 813
        memcpy(pkt->data, ast->pkt.data + st->codecpar->block_align * //FIXME avoid this
               (ast->sub_packet_h * ast->audio_framesize / st->codecpar->block_align - rm->audio_pkt_cnt),
               st->codecpar->block_align);
814 815
    }
    rm->audio_pkt_cnt--;
816 817
    if ((pkt->pts = ast->audiotimestamp) != AV_NOPTS_VALUE) {
        ast->audiotimestamp = AV_NOPTS_VALUE;
818
        pkt->flags = AV_PKT_FLAG_KEY;
819
    } else
820
        pkt->flags = 0;
821
    pkt->stream_index = st->index;
822 823

    return rm->audio_pkt_cnt;
824 825
}

Fabrice Bellard's avatar
Fabrice Bellard committed
826 827
static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
{
828
    RMDemuxContext *rm = s->priv_data;
Fabrice Bellard's avatar
Fabrice Bellard committed
829
    AVStream *st;
830
    int i, len, res, seq = 1;
831
    int64_t timestamp, pos;
832
    int flags;
Fabrice Bellard's avatar
Fabrice Bellard committed
833

834
    for (;;) {
835 836 837 838
        if (rm->audio_pkt_cnt) {
            // If there are queued audio packet return them first
            st = s->streams[rm->audio_stream_num];
            ff_rm_retrieve_cache(s, s->pb, st, st->priv_data, pkt);
839
            flags = 0;
840 841
        } else {
            if (rm->old_format) {
842
                RMStream *ast;
Ronald S. Bultje's avatar
Ronald S. Bultje committed
843

844 845
                st = s->streams[0];
                ast = st->priv_data;
846 847 848 849
                timestamp = AV_NOPTS_VALUE;
                len = !ast->audio_framesize ? RAW_PACKET_SIZE :
                    ast->coded_framesize * ast->sub_packet_h / 2;
                flags = (seq++ == 1) ? 2 : 0;
850
                pos = avio_tell(s->pb);
851 852
            } else {
                len=sync(s, &timestamp, &flags, &i, &pos);
853 854
                if (len > 0)
                    st = s->streams[i];
855 856
            }

857
            if (len <= 0 || s->pb->eof_reached)
858
                return AVERROR(EIO);
Michael Niedermayer's avatar
Michael Niedermayer committed
859

860
            res = ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,
861
                                      &seq, flags, timestamp);
862
            if((flags&2) && (seq&0x7F) == 1)
863
                av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
864 865 866
            if (res)
                continue;
        }
Michael Niedermayer's avatar
Michael Niedermayer committed
867

868 869
        if(  (st->discard >= AVDISCARD_NONKEY && !(flags&2))
           || st->discard >= AVDISCARD_ALL){
870
            av_packet_unref(pkt);
871 872
        } else
            break;
873 874
    }

Fabrice Bellard's avatar
Fabrice Bellard committed
875 876 877 878 879
    return 0;
}

static int rm_read_close(AVFormatContext *s)
{
880 881 882 883
    int i;

    for (i=0;i<s->nb_streams;i++)
        ff_rm_free_rmstream(s->streams[i]->priv_data);
884

Fabrice Bellard's avatar
Fabrice Bellard committed
885 886 887
    return 0;
}

Fabrice Bellard's avatar
Fabrice Bellard committed
888 889 890
static int rm_probe(AVProbeData *p)
{
    /* check file header */
891 892 893 894 895
    if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
         p->buf[2] == 'M' && p->buf[3] == 'F' &&
         p->buf[4] == 0 && p->buf[5] == 0) ||
        (p->buf[0] == '.' && p->buf[1] == 'r' &&
         p->buf[2] == 'a' && p->buf[3] == 0xfd))
Fabrice Bellard's avatar
Fabrice Bellard committed
896 897 898 899 900
        return AVPROBE_SCORE_MAX;
    else
        return 0;
}

901
static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
Michael Niedermayer's avatar
Michael Niedermayer committed
902 903
                               int64_t *ppos, int64_t pos_limit)
{
904
    RMDemuxContext *rm = s->priv_data;
Michael Niedermayer's avatar
Michael Niedermayer committed
905
    int64_t pos, dts;
906
    int stream_index2, flags, len, h;
Michael Niedermayer's avatar
Michael Niedermayer committed
907 908

    pos = *ppos;
909

Michael Niedermayer's avatar
Michael Niedermayer committed
910 911 912
    if(rm->old_format)
        return AV_NOPTS_VALUE;

913
    avio_seek(s->pb, pos, SEEK_SET);
Michael Niedermayer's avatar
Michael Niedermayer committed
914 915
    rm->remaining_len=0;
    for(;;){
916 917 918 919
        int seq=1;
        AVStream *st;

        len=sync(s, &dts, &flags, &stream_index2, &pos);
Michael Niedermayer's avatar
Michael Niedermayer committed
920 921
        if(len<0)
            return AV_NOPTS_VALUE;
922 923

        st = s->streams[stream_index2];
924
        if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
925
            h= avio_r8(s->pb); len--;
926
            if(!(h & 0x40)){
927
                seq = avio_r8(s->pb); len--;
Michael Niedermayer's avatar
Michael Niedermayer committed
928 929
            }
        }
930

931
        if((flags&2) && (seq&0x7F) == 1){
932
            av_log(s, AV_LOG_TRACE, "%d %d-%d %"PRId64" %d\n",
933
                    flags, stream_index2, stream_index, dts, seq);
934
            av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);
935 936 937 938
            if(stream_index2 == stream_index)
                break;
        }

939
        avio_skip(s->pb, len);
Michael Niedermayer's avatar
Michael Niedermayer committed
940 941 942 943 944
    }
    *ppos = pos;
    return dts;
}

945
AVInputFormat ff_rm_demuxer = {
946
    .name           = "rm",
947
    .long_name      = NULL_IF_CONFIG_SMALL("RealMedia"),
948 949 950 951 952 953
    .priv_data_size = sizeof(RMDemuxContext),
    .read_probe     = rm_probe,
    .read_header    = rm_read_header,
    .read_packet    = rm_read_packet,
    .read_close     = rm_read_close,
    .read_timestamp = rm_read_dts,
Fabrice Bellard's avatar
Fabrice Bellard committed
954
};
955

956
AVInputFormat ff_rdt_demuxer = {
957 958 959 960
    .name           = "rdt",
    .long_name      = NULL_IF_CONFIG_SMALL("RDT demuxer"),
    .priv_data_size = sizeof(RMDemuxContext),
    .read_close     = rm_read_close,
961
    .flags          = AVFMT_NOFILE,
962
};