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ffmpeg / libavformat / rm.c @ b9866ebc

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1
/*
2
 * "Real" compatible mux and demux.
3
 * Copyright (c) 2000, 2001 Fabrice Bellard.
4
 *
5
 * This library is free software; you can redistribute it and/or
6
 * modify it under the terms of the GNU Lesser General Public
7
 * License as published by the Free Software Foundation; either
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 * version 2 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13
 * Lesser General Public License for more details.
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 *
15
 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18
 */
19
#include "avformat.h"
20

    
21
/* in ms */
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#define BUFFER_DURATION 0 
23

    
24
typedef struct {
25
    int nb_packets;
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    int packet_total_size;
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    int packet_max_size;
28
    /* codec related output */
29
    int bit_rate;
30
    float frame_rate;
31
    int nb_frames;    /* current frame number */
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    int total_frames; /* total number of frames */
33
    int num;
34
    AVCodecContext *enc;
35
} StreamInfo;
36

    
37
typedef struct {
38
    StreamInfo streams[2];
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    StreamInfo *audio_stream, *video_stream;
40
    int data_pos; /* position of the data after the header */
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    int nb_packets;
42
    int old_format;
43
    int current_stream;
44
    int remaining_len;
45
} RMContext;
46

    
47
#ifdef CONFIG_ENCODERS
48
static void put_str(ByteIOContext *s, const char *tag)
49
{
50
    put_be16(s,strlen(tag));
51
    while (*tag) {
52
        put_byte(s, *tag++);
53
    }
54
}
55

    
56
static void put_str8(ByteIOContext *s, const char *tag)
57
{
58
    put_byte(s, strlen(tag));
59
    while (*tag) {
60
        put_byte(s, *tag++);
61
    }
62
}
63

    
64
static void rv10_write_header(AVFormatContext *ctx, 
65
                              int data_size, int index_pos)
66
{
67
    RMContext *rm = ctx->priv_data;
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    ByteIOContext *s = &ctx->pb;
69
    StreamInfo *stream;
70
    unsigned char *data_offset_ptr, *start_ptr;
71
    const char *desc, *mimetype;
72
    int nb_packets, packet_total_size, packet_max_size, size, packet_avg_size, i;
73
    int bit_rate, v, duration, flags, data_pos;
74

    
75
    start_ptr = s->buf_ptr;
76

    
77
    put_tag(s, ".RMF");
78
    put_be32(s,18); /* header size */
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    put_be16(s,0);
80
    put_be32(s,0);
81
    put_be32(s,4 + ctx->nb_streams); /* num headers */
82

    
83
    put_tag(s,"PROP");
84
    put_be32(s, 50);
85
    put_be16(s, 0);
86
    packet_max_size = 0;
87
    packet_total_size = 0;
88
    nb_packets = 0;
89
    bit_rate = 0;
90
    duration = 0;
91
    for(i=0;i<ctx->nb_streams;i++) {
92
        StreamInfo *stream = &rm->streams[i];
93
        bit_rate += stream->bit_rate;
94
        if (stream->packet_max_size > packet_max_size)
95
            packet_max_size = stream->packet_max_size;
96
        nb_packets += stream->nb_packets;
97
        packet_total_size += stream->packet_total_size;
98
        /* select maximum duration */
99
        v = (int) (1000.0 * (float)stream->total_frames / stream->frame_rate);
100
        if (v > duration)
101
            duration = v;
102
    }
103
    put_be32(s, bit_rate); /* max bit rate */
104
    put_be32(s, bit_rate); /* avg bit rate */
105
    put_be32(s, packet_max_size);        /* max packet size */
106
    if (nb_packets > 0)
107
        packet_avg_size = packet_total_size / nb_packets;
108
    else
109
        packet_avg_size = 0;
110
    put_be32(s, packet_avg_size);        /* avg packet size */
111
    put_be32(s, nb_packets);  /* num packets */
112
    put_be32(s, duration); /* duration */
113
    put_be32(s, BUFFER_DURATION);           /* preroll */
114
    put_be32(s, index_pos);           /* index offset */
115
    /* computation of data the data offset */
116
    data_offset_ptr = s->buf_ptr;
117
    put_be32(s, 0);           /* data offset : will be patched after */
118
    put_be16(s, ctx->nb_streams);    /* num streams */
119
    flags = 1 | 2; /* save allowed & perfect play */
120
    if (url_is_streamed(s))
121
        flags |= 4; /* live broadcast */
122
    put_be16(s, flags);
123
    
124
    /* comments */
125

    
126
    put_tag(s,"CONT");
127
    size = strlen(ctx->title) + strlen(ctx->author) + strlen(ctx->copyright) + 
128
        strlen(ctx->comment) + 4 * 2 + 10;
129
    put_be32(s,size);
130
    put_be16(s,0);
131
    put_str(s, ctx->title);
132
    put_str(s, ctx->author);
133
    put_str(s, ctx->copyright);
134
    put_str(s, ctx->comment);
135
    
136
    for(i=0;i<ctx->nb_streams;i++) {
137
        int codec_data_size;
138

    
139
        stream = &rm->streams[i];
140
        
141
        if (stream->enc->codec_type == CODEC_TYPE_AUDIO) {
142
            desc = "The Audio Stream";
143
            mimetype = "audio/x-pn-realaudio";
144
            codec_data_size = 73;
145
        } else {
146
            desc = "The Video Stream";
147
            mimetype = "video/x-pn-realvideo";
148
            codec_data_size = 34;
149
        }
150

    
151
        put_tag(s,"MDPR");
152
        size = 10 + 9 * 4 + strlen(desc) + strlen(mimetype) + codec_data_size;
153
        put_be32(s, size);
154
        put_be16(s, 0);
155

    
156
        put_be16(s, i); /* stream number */
157
        put_be32(s, stream->bit_rate); /* max bit rate */
158
        put_be32(s, stream->bit_rate); /* avg bit rate */
159
        put_be32(s, stream->packet_max_size);        /* max packet size */
160
        if (stream->nb_packets > 0)
161
            packet_avg_size = stream->packet_total_size / 
162
                stream->nb_packets;
163
        else
164
            packet_avg_size = 0;
165
        put_be32(s, packet_avg_size);        /* avg packet size */
166
        put_be32(s, 0);           /* start time */
167
        put_be32(s, BUFFER_DURATION);           /* preroll */
168
        /* duration */
169
        if (url_is_streamed(s) || !stream->total_frames)
170
            put_be32(s, (int)(3600 * 1000));
171
        else
172
            put_be32(s, (int)(stream->total_frames * 1000 / stream->frame_rate));
173
        put_str8(s, desc);
174
        put_str8(s, mimetype);
175
        put_be32(s, codec_data_size);
176
        
177
        if (stream->enc->codec_type == CODEC_TYPE_AUDIO) {
178
            int coded_frame_size, fscode, sample_rate;
179
            sample_rate = stream->enc->sample_rate;
180
            coded_frame_size = (stream->enc->bit_rate * 
181
                                stream->enc->frame_size) / (8 * sample_rate);
182
            /* audio codec info */
183
            put_tag(s, ".ra");
184
            put_byte(s, 0xfd);
185
            put_be32(s, 0x00040000); /* version */
186
            put_tag(s, ".ra4");
187
            put_be32(s, 0x01b53530); /* stream length */
188
            put_be16(s, 4); /* unknown */
189
            put_be32(s, 0x39); /* header size */
190

    
191
            switch(sample_rate) {
192
            case 48000:
193
            case 24000:
194
            case 12000:
195
                fscode = 1;
196
                break;
197
            default:
198
            case 44100:
199
            case 22050:
200
            case 11025:
201
                fscode = 2;
202
                break;
203
            case 32000:
204
            case 16000:
205
            case 8000:
206
                fscode = 3;
207
            }
208
            put_be16(s, fscode); /* codec additional info, for AC3, seems
209
                                     to be a frequency code */
210
            /* special hack to compensate rounding errors... */
211
            if (coded_frame_size == 557)
212
                coded_frame_size--;
213
            put_be32(s, coded_frame_size); /* frame length */
214
            put_be32(s, 0x51540); /* unknown */
215
            put_be32(s, 0x249f0); /* unknown */
216
            put_be32(s, 0x249f0); /* unknown */
217
            put_be16(s, 0x01);
218
            /* frame length : seems to be very important */
219
            put_be16(s, coded_frame_size); 
220
            put_be32(s, 0); /* unknown */
221
            put_be16(s, stream->enc->sample_rate); /* sample rate */
222
            put_be32(s, 0x10); /* unknown */
223
            put_be16(s, stream->enc->channels);
224
            put_str8(s, "Int0"); /* codec name */
225
            put_str8(s, "dnet"); /* codec name */
226
            put_be16(s, 0); /* title length */
227
            put_be16(s, 0); /* author length */
228
            put_be16(s, 0); /* copyright length */
229
            put_byte(s, 0); /* end of header */
230
        } else {
231
            /* video codec info */
232
            put_be32(s,34); /* size */
233
            if(stream->enc->codec_id == CODEC_ID_RV10)
234
                put_tag(s,"VIDORV10");
235
            else
236
                put_tag(s,"VIDORV20");
237
            put_be16(s, stream->enc->width);
238
            put_be16(s, stream->enc->height);
239
            put_be16(s, (int) stream->frame_rate); /* frames per seconds ? */
240
            put_be32(s,0);     /* unknown meaning */
241
            put_be16(s, (int) stream->frame_rate);  /* unknown meaning */
242
            put_be32(s,0);     /* unknown meaning */
243
            put_be16(s, 8);    /* unknown meaning */
244
            /* Seems to be the codec version: only use basic H263. The next
245
               versions seems to add a diffential DC coding as in
246
               MPEG... nothing new under the sun */
247
            if(stream->enc->codec_id == CODEC_ID_RV10)
248
                put_be32(s,0x10000000); 
249
            else
250
                put_be32(s,0x20103001); 
251
            //put_be32(s,0x10003000); 
252
        }
253
    }
254

    
255
    /* patch data offset field */
256
    data_pos = s->buf_ptr - start_ptr;
257
    rm->data_pos = data_pos;
258
    data_offset_ptr[0] = data_pos >> 24;
259
    data_offset_ptr[1] = data_pos >> 16;
260
    data_offset_ptr[2] = data_pos >> 8;
261
    data_offset_ptr[3] = data_pos;
262
    
263
    /* data stream */
264
    put_tag(s,"DATA");
265
    put_be32(s,data_size + 10 + 8);
266
    put_be16(s,0);
267

    
268
    put_be32(s, nb_packets); /* number of packets */
269
    put_be32(s,0); /* next data header */
270
}
271

    
272
static void write_packet_header(AVFormatContext *ctx, StreamInfo *stream, 
273
                                int length, int key_frame)
274
{
275
    int timestamp;
276
    ByteIOContext *s = &ctx->pb;
277

    
278
    stream->nb_packets++;
279
    stream->packet_total_size += length;
280
    if (length > stream->packet_max_size)
281
        stream->packet_max_size =  length;
282

    
283
    put_be16(s,0); /* version */
284
    put_be16(s,length + 12);
285
    put_be16(s, stream->num); /* stream number */
286
    timestamp = (1000 * (float)stream->nb_frames) / stream->frame_rate;
287
    put_be32(s, timestamp); /* timestamp */
288
    put_byte(s, 0); /* reserved */
289
    put_byte(s, key_frame ? 2 : 0); /* flags */
290
}
291

    
292
static int rm_write_header(AVFormatContext *s)
293
{
294
    RMContext *rm = s->priv_data;
295
    StreamInfo *stream;
296
    int n;
297
    AVCodecContext *codec;
298

    
299
    for(n=0;n<s->nb_streams;n++) {
300
        s->streams[n]->id = n;
301
        codec = &s->streams[n]->codec;
302
        stream = &rm->streams[n];
303
        memset(stream, 0, sizeof(StreamInfo));
304
        stream->num = n;
305
        stream->bit_rate = codec->bit_rate;
306
        stream->enc = codec;
307

    
308
        switch(codec->codec_type) {
309
        case CODEC_TYPE_AUDIO:
310
            rm->audio_stream = stream;
311
            stream->frame_rate = (float)codec->sample_rate / (float)codec->frame_size;
312
            /* XXX: dummy values */
313
            stream->packet_max_size = 1024;
314
            stream->nb_packets = 0;
315
            stream->total_frames = stream->nb_packets;
316
            break;
317
        case CODEC_TYPE_VIDEO:
318
            rm->video_stream = stream;
319
            stream->frame_rate = (float)codec->frame_rate / (float)codec->frame_rate_base;
320
            /* XXX: dummy values */
321
            stream->packet_max_size = 4096;
322
            stream->nb_packets = 0;
323
            stream->total_frames = stream->nb_packets;
324
            break;
325
        default:
326
            return -1;
327
        }
328
    }
329

    
330
    rv10_write_header(s, 0, 0);
331
    put_flush_packet(&s->pb);
332
    return 0;
333
}
334

    
335
static int rm_write_audio(AVFormatContext *s, const uint8_t *buf, int size, int flags)
336
{
337
    uint8_t *buf1;
338
    RMContext *rm = s->priv_data;
339
    ByteIOContext *pb = &s->pb;
340
    StreamInfo *stream = rm->audio_stream;
341
    int i;
342

    
343
    /* XXX: suppress this malloc */
344
    buf1= (uint8_t*) av_malloc( size * sizeof(uint8_t) );
345
    
346
    write_packet_header(s, stream, size, !!(flags & PKT_FLAG_KEY));
347
    
348
    /* for AC3, the words seems to be reversed */
349
    for(i=0;i<size;i+=2) {
350
        buf1[i] = buf[i+1];
351
        buf1[i+1] = buf[i];
352
    }
353
    put_buffer(pb, buf1, size);
354
    put_flush_packet(pb);
355
    stream->nb_frames++;
356
    av_free(buf1);
357
    return 0;
358
}
359

    
360
static int rm_write_video(AVFormatContext *s, const uint8_t *buf, int size, int flags)
361
{
362
    RMContext *rm = s->priv_data;
363
    ByteIOContext *pb = &s->pb;
364
    StreamInfo *stream = rm->video_stream;
365
    int key_frame = !!(flags & PKT_FLAG_KEY);
366

    
367
    /* XXX: this is incorrect: should be a parameter */
368

    
369
    /* Well, I spent some time finding the meaning of these bits. I am
370
       not sure I understood everything, but it works !! */
371
#if 1
372
    write_packet_header(s, stream, size + 7, key_frame);
373
    /* bit 7: '1' if final packet of a frame converted in several packets */
374
    put_byte(pb, 0x81); 
375
    /* bit 7: '1' if I frame. bits 6..0 : sequence number in current
376
       frame starting from 1 */
377
    if (key_frame) {
378
        put_byte(pb, 0x81); 
379
    } else {
380
        put_byte(pb, 0x01); 
381
    }
382
    put_be16(pb, 0x4000 + (size)); /* total frame size */
383
    put_be16(pb, 0x4000 + (size));              /* offset from the start or the end */
384
#else
385
    /* full frame */
386
    write_packet_header(s, size + 6);
387
    put_byte(pb, 0xc0); 
388
    put_be16(pb, 0x4000 + size); /* total frame size */
389
    put_be16(pb, 0x4000 + packet_number * 126); /* position in stream */
390
#endif
391
    put_byte(pb, stream->nb_frames & 0xff); 
392
    
393
    put_buffer(pb, buf, size);
394
    put_flush_packet(pb);
395

    
396
    stream->nb_frames++;
397
    return 0;
398
}
399

    
400
static int rm_write_packet(AVFormatContext *s, AVPacket *pkt)
401
{
402
    if (s->streams[pkt->stream_index]->codec.codec_type == 
403
        CODEC_TYPE_AUDIO)
404
        return rm_write_audio(s, pkt->data, pkt->size, pkt->flags);
405
    else
406
        return rm_write_video(s, pkt->data, pkt->size, pkt->flags);
407
}
408
        
409
static int rm_write_trailer(AVFormatContext *s)
410
{
411
    RMContext *rm = s->priv_data;
412
    int data_size, index_pos, i;
413
    ByteIOContext *pb = &s->pb;
414

    
415
    if (!url_is_streamed(&s->pb)) {
416
        /* end of file: finish to write header */
417
        index_pos = url_fseek(pb, 0, SEEK_CUR);
418
        data_size = index_pos - rm->data_pos;
419

    
420
        /* index */
421
        put_tag(pb, "INDX");
422
        put_be32(pb, 10 + 10 * s->nb_streams);
423
        put_be16(pb, 0);
424
        
425
        for(i=0;i<s->nb_streams;i++) {
426
            put_be32(pb, 0); /* zero indices */
427
            put_be16(pb, i); /* stream number */
428
            put_be32(pb, 0); /* next index */
429
        }
430
        /* undocumented end header */
431
        put_be32(pb, 0);
432
        put_be32(pb, 0);
433
        
434
        url_fseek(pb, 0, SEEK_SET);
435
        for(i=0;i<s->nb_streams;i++)
436
            rm->streams[i].total_frames = rm->streams[i].nb_frames;
437
        rv10_write_header(s, data_size, index_pos);
438
    } else {
439
        /* undocumented end header */
440
        put_be32(pb, 0);
441
        put_be32(pb, 0);
442
    }
443
    put_flush_packet(pb);
444
    return 0;
445
}
446
#endif //CONFIG_ENCODERS
447

    
448
/***************************************************/
449

    
450
static void get_str(ByteIOContext *pb, char *buf, int buf_size)
451
{
452
    int len, i;
453
    char *q;
454

    
455
    len = get_be16(pb);
456
    q = buf;
457
    for(i=0;i<len;i++) {
458
        if (i < buf_size - 1)
459
            *q++ = get_byte(pb);
460
    }
461
    *q = '\0';
462
}
463

    
464
static void get_str8(ByteIOContext *pb, char *buf, int buf_size)
465
{
466
    int len, i;
467
    char *q;
468

    
469
    len = get_byte(pb);
470
    q = buf;
471
    for(i=0;i<len;i++) {
472
        if (i < buf_size - 1)
473
            *q++ = get_byte(pb);
474
    }
475
    *q = '\0';
476
}
477

    
478
static void rm_read_audio_stream_info(AVFormatContext *s, AVStream *st, 
479
                                      int read_all)
480
{
481
    ByteIOContext *pb = &s->pb;
482
    char buf[128];
483
    uint32_t version;
484
    int i;
485

    
486
    /* ra type header */
487
    version = get_be32(pb); /* version */
488
    if (((version >> 16) & 0xff) == 3) {
489
        /* very old version */
490
        for(i = 0; i < 14; i++)
491
            get_byte(pb);
492
        get_str8(pb, s->title, sizeof(s->title));
493
        get_str8(pb, s->author, sizeof(s->author));
494
        get_str8(pb, s->copyright, sizeof(s->copyright));
495
        get_str8(pb, s->comment, sizeof(s->comment));
496
        get_byte(pb);
497
        get_str8(pb, buf, sizeof(buf));
498
        st->codec.sample_rate = 8000;
499
        st->codec.channels = 1;
500
        st->codec.codec_type = CODEC_TYPE_AUDIO;
501
        st->codec.codec_id = CODEC_ID_RA_144;
502
    } else {
503
        /* old version (4) */
504
        get_be32(pb); /* .ra4 */
505
        get_be32(pb);
506
        get_be16(pb);
507
        get_be32(pb); /* header size */
508
        get_be16(pb); /* add codec info */
509
        get_be32(pb); /* coded frame size */
510
        get_be32(pb); /* ??? */
511
        get_be32(pb); /* ??? */
512
        get_be32(pb); /* ??? */
513
        get_be16(pb); /* 1 */ 
514
        get_be16(pb); /* coded frame size */
515
        get_be32(pb);
516
        st->codec.sample_rate = get_be16(pb);
517
        get_be32(pb);
518
        st->codec.channels = get_be16(pb);
519
        get_str8(pb, buf, sizeof(buf)); /* desc */
520
        get_str8(pb, buf, sizeof(buf)); /* desc */
521
        st->codec.codec_type = CODEC_TYPE_AUDIO;
522
        if (!strcmp(buf, "dnet")) {
523
            st->codec.codec_id = CODEC_ID_AC3;
524
        } else {
525
            st->codec.codec_id = CODEC_ID_NONE;
526
            pstrcpy(st->codec.codec_name, sizeof(st->codec.codec_name),
527
                    buf);
528
        }
529
        if (read_all) {
530
            get_byte(pb);
531
            get_byte(pb);
532
            get_byte(pb);
533
            
534
            get_str8(pb, s->title, sizeof(s->title));
535
            get_str8(pb, s->author, sizeof(s->author));
536
            get_str8(pb, s->copyright, sizeof(s->copyright));
537
            get_str8(pb, s->comment, sizeof(s->comment));
538
        }
539
    }
540
}
541

    
542
static int rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap)
543
{
544
    RMContext *rm = s->priv_data;
545
    AVStream *st;
546

    
547
    rm->old_format = 1;
548
    st = av_new_stream(s, 0);
549
    if (!st)
550
        goto fail;
551
    rm_read_audio_stream_info(s, st, 1);
552
    return 0;
553
 fail:
554
    return -1;
555
}
556

    
557
static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
558
{
559
    RMContext *rm = s->priv_data;
560
    AVStream *st;
561
    ByteIOContext *pb = &s->pb;
562
    unsigned int tag, v;
563
    int tag_size, size, codec_data_size, i;
564
    int64_t codec_pos;
565
    unsigned int h263_hack_version, start_time, duration;
566
    char buf[128];
567
    int flags = 0;
568

    
569
    tag = get_le32(pb);
570
    if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
571
        /* very old .ra format */
572
        return rm_read_header_old(s, ap);
573
    } else if (tag != MKTAG('.', 'R', 'M', 'F')) {
574
        return AVERROR_IO;
575
    }
576

    
577
    get_be32(pb); /* header size */
578
    get_be16(pb);
579
    get_be32(pb);
580
    get_be32(pb); /* number of headers */
581
    
582
    for(;;) {
583
        if (url_feof(pb))
584
            goto fail;
585
        tag = get_le32(pb);
586
        tag_size = get_be32(pb);
587
        get_be16(pb);
588
#if 0
589
        printf("tag=%c%c%c%c (%08x) size=%d\n", 
590
               (tag) & 0xff,
591
               (tag >> 8) & 0xff,
592
               (tag >> 16) & 0xff,
593
               (tag >> 24) & 0xff,
594
               tag,
595
               tag_size);
596
#endif
597
        if (tag_size < 10)
598
            goto fail;
599
        switch(tag) {
600
        case MKTAG('P', 'R', 'O', 'P'):
601
            /* file header */
602
            get_be32(pb); /* max bit rate */
603
            get_be32(pb); /* avg bit rate */
604
            get_be32(pb); /* max packet size */
605
            get_be32(pb); /* avg packet size */
606
            get_be32(pb); /* nb packets */
607
            get_be32(pb); /* duration */
608
            get_be32(pb); /* preroll */
609
            get_be32(pb); /* index offset */
610
            get_be32(pb); /* data offset */
611
            get_be16(pb); /* nb streams */
612
            flags = get_be16(pb); /* flags */
613
            break;
614
        case MKTAG('C', 'O', 'N', 'T'):
615
            get_str(pb, s->title, sizeof(s->title));
616
            get_str(pb, s->author, sizeof(s->author));
617
            get_str(pb, s->copyright, sizeof(s->copyright));
618
            get_str(pb, s->comment, sizeof(s->comment));
619
            break;
620
        case MKTAG('M', 'D', 'P', 'R'):
621
            st = av_new_stream(s, 0);
622
            if (!st)
623
                goto fail;
624
            st->id = get_be16(pb);
625
            get_be32(pb); /* max bit rate */
626
            st->codec.bit_rate = get_be32(pb); /* bit rate */
627
            get_be32(pb); /* max packet size */
628
            get_be32(pb); /* avg packet size */
629
            start_time = get_be32(pb); /* start time */
630
            get_be32(pb); /* preroll */
631
            duration = get_be32(pb); /* duration */
632
            st->start_time = start_time * (AV_TIME_BASE / 1000);
633
            st->duration = duration * (AV_TIME_BASE / 1000);
634
            get_str8(pb, buf, sizeof(buf)); /* desc */
635
            get_str8(pb, buf, sizeof(buf)); /* mimetype */
636
            codec_data_size = get_be32(pb);
637
            codec_pos = url_ftell(pb);
638
            st->codec.codec_type = CODEC_TYPE_DATA;
639
            av_set_pts_info(st, 64, 1, 1000);
640

    
641
            v = get_be32(pb);
642
            if (v == MKTAG(0xfd, 'a', 'r', '.')) {
643
                /* ra type header */
644
                rm_read_audio_stream_info(s, st, 0);
645
            } else {
646
                int fps, fps2;
647
                if (get_le32(pb) != MKTAG('V', 'I', 'D', 'O')) {
648
                fail1:
649
                    av_log(&st->codec, AV_LOG_ERROR, "Unsupported video codec\n");
650
                    goto skip;
651
                }
652
                st->codec.codec_tag = get_le32(pb);
653
//                av_log(NULL, AV_LOG_DEBUG, "%X %X\n", st->codec.codec_tag, MKTAG('R', 'V', '2', '0'));
654
                if (   st->codec.codec_tag != MKTAG('R', 'V', '1', '0')
655
                    && st->codec.codec_tag != MKTAG('R', 'V', '2', '0')
656
                    && st->codec.codec_tag != MKTAG('R', 'V', '3', '0')
657
                    && st->codec.codec_tag != MKTAG('R', 'V', '4', '0'))
658
                    goto fail1;
659
                st->codec.width = get_be16(pb);
660
                st->codec.height = get_be16(pb);
661
                st->codec.frame_rate_base= 1;
662
                fps= get_be16(pb);
663
                st->codec.codec_type = CODEC_TYPE_VIDEO;
664
                get_be32(pb);
665
                fps2= get_be16(pb);
666
                get_be16(pb);
667
                
668
                st->codec.extradata_size= codec_data_size - (url_ftell(pb) - codec_pos);
669
                st->codec.extradata= av_malloc(st->codec.extradata_size);
670
                get_buffer(pb, st->codec.extradata, st->codec.extradata_size);
671
                
672
//                av_log(NULL, AV_LOG_DEBUG, "fps= %d fps2= %d\n", fps, fps2);
673
                st->codec.frame_rate = fps * st->codec.frame_rate_base;
674
                /* modification of h263 codec version (!) */
675
#ifdef WORDS_BIGENDIAN
676
                h263_hack_version = ((uint32_t*)st->codec.extradata)[1];
677
#else
678
                h263_hack_version = bswap_32(((uint32_t*)st->codec.extradata)[1]);
679
#endif
680
                st->codec.sub_id = h263_hack_version;
681
                switch((h263_hack_version>>28)){
682
                case 1: st->codec.codec_id = CODEC_ID_RV10; break;
683
                case 2: st->codec.codec_id = CODEC_ID_RV20; break;
684
                case 3: st->codec.codec_id = CODEC_ID_RV30; break;
685
                case 4: st->codec.codec_id = CODEC_ID_RV40; break;
686
                default: goto fail1;
687
                }
688
            }
689
skip:
690
            /* skip codec info */
691
            size = url_ftell(pb) - codec_pos;
692
            url_fskip(pb, codec_data_size - size);
693
            break;
694
        case MKTAG('D', 'A', 'T', 'A'):
695
            goto header_end;
696
        default:
697
            /* unknown tag: skip it */
698
            url_fskip(pb, tag_size - 10);
699
            break;
700
        }
701
    }
702
 header_end:
703
    rm->nb_packets = get_be32(pb); /* number of packets */
704
    if (!rm->nb_packets && (flags & 4))
705
        rm->nb_packets = 3600 * 25;
706
    get_be32(pb); /* next data header */
707
    return 0;
708

    
709
 fail:
710
    for(i=0;i<s->nb_streams;i++) {
711
        av_free(s->streams[i]);
712
    }
713
    return AVERROR_IO;
714
}
715

    
716
static int get_num(ByteIOContext *pb, int *len)
717
{
718
    int n, n1;
719

    
720
    n = get_be16(pb);
721
    (*len)-=2;
722
    if (n >= 0x4000) {
723
        return n - 0x4000;
724
    } else {
725
        n1 = get_be16(pb);
726
        (*len)-=2;
727
        return (n << 16) | n1;
728
    }
729
}
730

    
731
/* multiple of 20 bytes for ra144 (ugly) */
732
#define RAW_PACKET_SIZE 1000
733

    
734
static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
735
    RMContext *rm = s->priv_data;
736
    ByteIOContext *pb = &s->pb;
737
    int len, num, res, i;
738
    AVStream *st;
739
    uint32_t state=0xFFFFFFFF;
740

    
741
    while(!url_feof(pb)){
742
        *pos= url_ftell(pb);
743
        if(rm->remaining_len > 0){
744
            num= rm->current_stream;
745
            len= rm->remaining_len;
746
            *timestamp = AV_NOPTS_VALUE;
747
            *flags= 0;
748
        }else{
749
            state= (state<<8) + get_byte(pb);
750
            
751
            if(state == MKBETAG('I', 'N', 'D', 'X')){
752
                len = get_be16(pb) - 6;
753
                if(len<0)
754
                    continue;
755
                goto skip;
756
            }
757
            
758
            if(state > (unsigned)0xFFFF || state < 12)
759
                continue;
760
            len=state;
761
            state= 0xFFFFFFFF;
762

    
763
            num = get_be16(pb);
764
            *timestamp = get_be32(pb);
765
            res= get_byte(pb); /* reserved */
766
            *flags = get_byte(pb); /* flags */
767

    
768
            
769
            len -= 12;
770
        }
771
        for(i=0;i<s->nb_streams;i++) {
772
            st = s->streams[i];
773
            if (num == st->id)
774
                break;
775
        }
776
        if (i == s->nb_streams) {
777
skip:
778
            /* skip packet if unknown number */
779
            url_fskip(pb, len);
780
            rm->remaining_len -= len;
781
            continue;
782
        }
783
        *stream_index= i;
784
        
785
        return len;
786
    }
787
    return -1;
788
}
789

    
790
static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
791
{
792
    RMContext *rm = s->priv_data;
793
    ByteIOContext *pb = &s->pb;
794
    AVStream *st;
795
    int i, len, tmp, j;
796
    int64_t timestamp, pos;
797
    uint8_t *ptr;
798
    int flags;
799

    
800
    if (rm->old_format) {
801
        /* just read raw bytes */
802
        len = RAW_PACKET_SIZE;
803
        av_new_packet(pkt, len);
804
        pkt->stream_index = 0;
805
        len = get_buffer(pb, pkt->data, len);
806
        if (len <= 0) {
807
            av_free_packet(pkt);
808
            return AVERROR_IO;
809
        }
810
        pkt->size = len;
811
        st = s->streams[0];
812
    } else {
813
        int seq=1;
814
resync:
815
        len=sync(s, &timestamp, &flags, &i, &pos);
816
        if(len<0)
817
            return AVERROR_IO;
818
        st = s->streams[i];
819

    
820
        if (st->codec.codec_type == CODEC_TYPE_VIDEO) {
821
            int h, pic_num, len2, pos;
822

    
823
            h= get_byte(pb); len--;
824
            if(!(h & 0x40)){
825
                seq = get_byte(pb); len--;
826
            }
827

    
828
            if((h & 0xc0) == 0x40){
829
                len2= pos= 0;
830
            }else{
831
                len2 = get_num(pb, &len);
832
                pos = get_num(pb, &len);
833
            }
834
            /* picture number */
835
            pic_num= get_byte(pb); len--;
836
            rm->remaining_len= len;
837
            rm->current_stream= st->id;
838

    
839
//            av_log(NULL, AV_LOG_DEBUG, "%X len:%d pos:%d len2:%d pic_num:%d\n",h, len, pos, len2, pic_num);
840
            if(len2 && len2<len)
841
                len=len2;
842
            rm->remaining_len-= len;
843
        }
844

    
845
        if(st->discard){
846
            url_fskip(pb, len);
847
            goto resync;
848
        }
849
        
850
        av_new_packet(pkt, len);
851
        pkt->stream_index = i;
852
        get_buffer(pb, pkt->data, len);
853

    
854
#if 0
855
        if (st->codec.codec_type == CODEC_TYPE_VIDEO) {
856
            if(st->codec.codec_id == CODEC_ID_RV20){
857
                int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
858
                av_log(NULL, AV_LOG_DEBUG, "%d %Ld %d\n", timestamp, timestamp*512LL/25, seq);
859

860
                seq |= (timestamp&~0x3FFF);
861
                if(seq - timestamp >  0x2000) seq -= 0x4000;
862
                if(seq - timestamp < -0x2000) seq += 0x4000;
863
            }
864
        }
865
#endif
866
        pkt->pts= timestamp;
867
        if(flags&2){
868
            pkt->flags |= PKT_FLAG_KEY;
869
            if((seq&0x7F) == 1)
870
                av_add_index_entry(st, pos, timestamp, 0, AVINDEX_KEYFRAME);
871
        }
872
    }
873

    
874
    /* for AC3, needs to swap bytes */
875
    if (st->codec.codec_id == CODEC_ID_AC3) {
876
        ptr = pkt->data;
877
        for(j=0;j<len;j+=2) {
878
            tmp = ptr[0];
879
            ptr[0] = ptr[1];
880
            ptr[1] = tmp;
881
                ptr += 2;
882
        }
883
    }
884
    return 0;
885
}
886

    
887
static int rm_read_close(AVFormatContext *s)
888
{
889
    return 0;
890
}
891

    
892
static int rm_probe(AVProbeData *p)
893
{
894
    /* check file header */
895
    if (p->buf_size <= 32)
896
        return 0;
897
    if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
898
         p->buf[2] == 'M' && p->buf[3] == 'F' &&
899
         p->buf[4] == 0 && p->buf[5] == 0) ||
900
        (p->buf[0] == '.' && p->buf[1] == 'r' &&
901
         p->buf[2] == 'a' && p->buf[3] == 0xfd))
902
        return AVPROBE_SCORE_MAX;
903
    else
904
        return 0;
905
}
906

    
907
static int64_t rm_read_dts(AVFormatContext *s, int stream_index, 
908
                               int64_t *ppos, int64_t pos_limit)
909
{
910
    RMContext *rm = s->priv_data;
911
    int64_t pos, dts;
912
    int stream_index2, flags, len, h;
913

    
914
    pos = *ppos;
915
    
916
    if(rm->old_format)
917
        return AV_NOPTS_VALUE;
918

    
919
    url_fseek(&s->pb, pos, SEEK_SET);
920
    rm->remaining_len=0;
921
    for(;;){
922
        int seq=1;
923
        AVStream *st;
924

    
925
        len=sync(s, &dts, &flags, &stream_index2, &pos);
926
        if(len<0)
927
            return AV_NOPTS_VALUE;
928

    
929
        st = s->streams[stream_index2];
930
        if (st->codec.codec_type == CODEC_TYPE_VIDEO) {
931
            h= get_byte(&s->pb); len--;
932
            if(!(h & 0x40)){
933
                seq = get_byte(&s->pb); len--;
934
            }
935
        }
936
            
937
        if((flags&2) && (seq&0x7F) == 1){
938
//            av_log(s, AV_LOG_DEBUG, "%d %d-%d %Ld %d\n", flags, stream_index2, stream_index, dts, seq);
939
            av_add_index_entry(st, pos, dts, 0, AVINDEX_KEYFRAME);
940
            if(stream_index2 == stream_index)
941
                break;
942
        }
943

    
944
        url_fskip(&s->pb, len);
945
    }
946
    *ppos = pos;
947
    return dts;
948
}
949

    
950
static AVInputFormat rm_iformat = {
951
    "rm",
952
    "rm format",
953
    sizeof(RMContext),
954
    rm_probe,
955
    rm_read_header,
956
    rm_read_packet,
957
    rm_read_close,
958
    NULL,
959
    rm_read_dts,
960
};
961

    
962
#ifdef CONFIG_ENCODERS
963
static AVOutputFormat rm_oformat = {
964
    "rm",
965
    "rm format",
966
    "application/vnd.rn-realmedia",
967
    "rm,ra",
968
    sizeof(RMContext),
969
    CODEC_ID_AC3,
970
    CODEC_ID_RV10,
971
    rm_write_header,
972
    rm_write_packet,
973
    rm_write_trailer,
974
};
975
#endif //CONFIG_ENCODERS
976

    
977
int rm_init(void)
978
{
979
    av_register_input_format(&rm_iformat);
980
#ifdef CONFIG_ENCODERS
981
    av_register_output_format(&rm_oformat);
982
#endif //CONFIG_ENCODERS
983
    return 0;
984
}