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ffmpeg / libavformat / ffm.c @ 04f46ced

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1 de6d9b64 Fabrice Bellard
/*
2
 * FFM (ffserver live feed) encoder and decoder
3 66d2ff2a Fabrice Bellard
 * Copyright (c) 2001 Fabrice Bellard.
4 de6d9b64 Fabrice Bellard
 *
5 66d2ff2a Fabrice Bellard
 * 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
8
 * version 2 of the License, or (at your option) any later version.
9 de6d9b64 Fabrice Bellard
 *
10 66d2ff2a Fabrice Bellard
 * This library is distributed in the hope that it will be useful,
11 de6d9b64 Fabrice Bellard
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 66d2ff2a Fabrice Bellard
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13
 * Lesser General Public License for more details.
14 de6d9b64 Fabrice Bellard
 *
15 66d2ff2a Fabrice Bellard
 * You should have received a copy of the GNU Lesser General Public
16
 * License along with this library; if not, write to the Free Software
17 5509bffa Diego Biurrun
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 de6d9b64 Fabrice Bellard
 */
19
#include "avformat.h"
20 8be1c656 Fabrice Bellard
#include <unistd.h>
21 de6d9b64 Fabrice Bellard
22
/* The FFM file is made of blocks of fixed size */
23
#define FFM_HEADER_SIZE 14
24
#define PACKET_ID       0x666d
25
26
/* each packet contains frames (which can span several packets */
27 20f01548 Philip Gladstone
#define FRAME_HEADER_SIZE    8
28 de6d9b64 Fabrice Bellard
#define FLAG_KEY_FRAME       0x01
29
30
typedef struct FFMStream {
31 0c1a9eda Zdenek Kabelac
    int64_t pts;
32 de6d9b64 Fabrice Bellard
} FFMStream;
33
34
enum {
35
    READ_HEADER,
36
    READ_DATA,
37
};
38
39
typedef struct FFMContext {
40
    /* only reading mode */
41
    offset_t write_index, file_size;
42 4606ac8d Zdenek Kabelac
    int read_state;
43 0c1a9eda Zdenek Kabelac
    uint8_t header[FRAME_HEADER_SIZE];
44 de6d9b64 Fabrice Bellard
45
    /* read and write */
46
    int first_packet; /* true if first packet, needed to set the discontinuity tag */
47 d271481f Michael Niedermayer
    int first_frame_in_packet; /* true if first frame in packet, needed to know if PTS information is valid */
48 de6d9b64 Fabrice Bellard
    int packet_size;
49
    int frame_offset;
50 0c1a9eda Zdenek Kabelac
    int64_t pts;
51
    uint8_t *packet_ptr, *packet_end;
52
    uint8_t packet[FFM_PACKET_SIZE];
53 de6d9b64 Fabrice Bellard
} FFMContext;
54
55 91628427 Philip Gladstone
static int64_t get_pts(AVFormatContext *s, offset_t pos);
56
57 c9a65ca8 Fabrice Bellard
/* disable pts hack for testing */
58
int ffm_nopts = 0;
59
60 a9e35095 Diego Biurrun
#ifdef CONFIG_MUXERS
61 de6d9b64 Fabrice Bellard
static void flush_packet(AVFormatContext *s)
62
{
63
    FFMContext *ffm = s->priv_data;
64
    int fill_size, h;
65
    ByteIOContext *pb = &s->pb;
66
67
    fill_size = ffm->packet_end - ffm->packet_ptr;
68
    memset(ffm->packet_ptr, 0, fill_size);
69 4606ac8d Zdenek Kabelac
70 115329f1 Diego Biurrun
    if (url_ftell(pb) % ffm->packet_size)
71 91628427 Philip Gladstone
        av_abort();
72
73 de6d9b64 Fabrice Bellard
    /* put header */
74 4606ac8d Zdenek Kabelac
    put_be16(pb, PACKET_ID);
75 de6d9b64 Fabrice Bellard
    put_be16(pb, fill_size);
76
    put_be64(pb, ffm->pts);
77
    h = ffm->frame_offset;
78
    if (ffm->first_packet)
79
        h |= 0x8000;
80
    put_be16(pb, h);
81
    put_buffer(pb, ffm->packet, ffm->packet_end - ffm->packet);
82 34f633df Philip Gladstone
    put_flush_packet(pb);
83 de6d9b64 Fabrice Bellard
84
    /* prepare next packet */
85
    ffm->frame_offset = 0; /* no key frame */
86
    ffm->pts = 0; /* no pts */
87
    ffm->packet_ptr = ffm->packet;
88
    ffm->first_packet = 0;
89
}
90
91
/* 'first' is true if first data of a frame */
92 4606ac8d Zdenek Kabelac
static void ffm_write_data(AVFormatContext *s,
93 49057904 Fabrice Bellard
                           const uint8_t *buf, int size,
94 0c1a9eda Zdenek Kabelac
                           int64_t pts, int first)
95 de6d9b64 Fabrice Bellard
{
96
    FFMContext *ffm = s->priv_data;
97
    int len;
98
99
    if (first && ffm->frame_offset == 0)
100
        ffm->frame_offset = ffm->packet_ptr - ffm->packet + FFM_HEADER_SIZE;
101
    if (first && ffm->pts == 0)
102
        ffm->pts = pts;
103
104
    /* write as many packets as needed */
105
    while (size > 0) {
106
        len = ffm->packet_end - ffm->packet_ptr;
107
        if (len > size)
108
            len = size;
109
        memcpy(ffm->packet_ptr, buf, len);
110 4606ac8d Zdenek Kabelac
111 de6d9b64 Fabrice Bellard
        ffm->packet_ptr += len;
112
        buf += len;
113
        size -= len;
114
        if (ffm->packet_ptr >= ffm->packet_end) {
115
            /* special case : no pts in packet : we leave the current one */
116
            if (ffm->pts == 0)
117
                ffm->pts = pts;
118
119
            flush_packet(s);
120
        }
121
    }
122
}
123
124
static int ffm_write_header(AVFormatContext *s)
125
{
126 c9a65ca8 Fabrice Bellard
    FFMContext *ffm = s->priv_data;
127 de6d9b64 Fabrice Bellard
    AVStream *st;
128
    FFMStream *fst;
129
    ByteIOContext *pb = &s->pb;
130
    AVCodecContext *codec;
131
    int bit_rate, i;
132
133
    ffm->packet_size = FFM_PACKET_SIZE;
134 4606ac8d Zdenek Kabelac
135 de6d9b64 Fabrice Bellard
    /* header */
136 26aa0f89 Alex Beregszaszi
    put_le32(pb, MKTAG('F', 'F', 'M', '1'));
137 de6d9b64 Fabrice Bellard
    put_be32(pb, ffm->packet_size);
138
    /* XXX: store write position in other file ? */
139
    put_be64(pb, ffm->packet_size); /* current write position */
140
141
    put_be32(pb, s->nb_streams);
142
    bit_rate = 0;
143
    for(i=0;i<s->nb_streams;i++) {
144
        st = s->streams[i];
145 01f4895c Michael Niedermayer
        bit_rate += st->codec->bit_rate;
146 de6d9b64 Fabrice Bellard
    }
147
    put_be32(pb, bit_rate);
148
149
    /* list of streams */
150
    for(i=0;i<s->nb_streams;i++) {
151
        st = s->streams[i];
152 16300e23 Philip Gladstone
        fst = av_mallocz(sizeof(FFMStream));
153 de6d9b64 Fabrice Bellard
        if (!fst)
154
            goto fail;
155 53e2f9ca Michael Niedermayer
        av_set_pts_info(st, 64, 1, 1000000);
156 de6d9b64 Fabrice Bellard
        st->priv_data = fst;
157
158 01f4895c Michael Niedermayer
        codec = st->codec;
159 de6d9b64 Fabrice Bellard
        /* generic info */
160
        put_be32(pb, codec->codec_id);
161
        put_byte(pb, codec->codec_type);
162
        put_be32(pb, codec->bit_rate);
163 bb270c08 Diego Biurrun
        put_be32(pb, st->quality);
164 ccac2e27 Philip Gladstone
        put_be32(pb, codec->flags);
165 22332126 Philip Gladstone
        put_be32(pb, codec->flags2);
166
        put_be32(pb, codec->debug);
167 de6d9b64 Fabrice Bellard
        /* specific info */
168
        switch(codec->codec_type) {
169
        case CODEC_TYPE_VIDEO:
170 c0df9d75 Michael Niedermayer
            put_be32(pb, codec->time_base.num);
171
            put_be32(pb, codec->time_base.den);
172 de6d9b64 Fabrice Bellard
            put_be16(pb, codec->width);
173
            put_be16(pb, codec->height);
174 20f01548 Philip Gladstone
            put_be16(pb, codec->gop_size);
175 22332126 Philip Gladstone
            put_be32(pb, codec->pix_fmt);
176 20f01548 Philip Gladstone
            put_byte(pb, codec->qmin);
177
            put_byte(pb, codec->qmax);
178
            put_byte(pb, codec->max_qdiff);
179
            put_be16(pb, (int) (codec->qcompress * 10000.0));
180
            put_be16(pb, (int) (codec->qblur * 10000.0));
181 3884a3c3 Philip Gladstone
            put_be32(pb, codec->bit_rate_tolerance);
182 3b4b29dc Fabrice Bellard
            put_strz(pb, codec->rc_eq);
183 75bdb984 Philip Gladstone
            put_be32(pb, codec->rc_max_rate);
184
            put_be32(pb, codec->rc_min_rate);
185
            put_be32(pb, codec->rc_buffer_size);
186 7cb8f314 Michael Niedermayer
            put_be64(pb, av_dbl2int(codec->i_quant_factor));
187
            put_be64(pb, av_dbl2int(codec->b_quant_factor));
188
            put_be64(pb, av_dbl2int(codec->i_quant_offset));
189
            put_be64(pb, av_dbl2int(codec->b_quant_offset));
190 75bdb984 Philip Gladstone
            put_be32(pb, codec->dct_algo);
191 22332126 Philip Gladstone
            put_be32(pb, codec->strict_std_compliance);
192
            put_be32(pb, codec->max_b_frames);
193
            put_be32(pb, codec->luma_elim_threshold);
194
            put_be32(pb, codec->chroma_elim_threshold);
195
            put_be32(pb, codec->mpeg_quant);
196
            put_be32(pb, codec->intra_dc_precision);
197
            put_be32(pb, codec->me_method);
198
            put_be32(pb, codec->mb_decision);
199
            put_be32(pb, codec->nsse_weight);
200
            put_be32(pb, codec->frame_skip_cmp);
201 7cb8f314 Michael Niedermayer
            put_be64(pb, av_dbl2int(codec->rc_buffer_aggressivity));
202 de6d9b64 Fabrice Bellard
            break;
203
        case CODEC_TYPE_AUDIO:
204
            put_be32(pb, codec->sample_rate);
205
            put_le16(pb, codec->channels);
206 20f01548 Philip Gladstone
            put_le16(pb, codec->frame_size);
207 de6d9b64 Fabrice Bellard
            break;
208 20f01548 Philip Gladstone
        default:
209 71c32f19 Michael Niedermayer
            return -1;
210 de6d9b64 Fabrice Bellard
        }
211
        /* hack to have real time */
212 c9a65ca8 Fabrice Bellard
        if (ffm_nopts)
213
            fst->pts = 0;
214
        else
215 a11bf0bd Fabrice Bellard
            fst->pts = av_gettime();
216 de6d9b64 Fabrice Bellard
    }
217
218
    /* flush until end of block reached */
219
    while ((url_ftell(pb) % ffm->packet_size) != 0)
220
        put_byte(pb, 0);
221
222
    put_flush_packet(pb);
223
224
    /* init packet mux */
225
    ffm->packet_ptr = ffm->packet;
226
    ffm->packet_end = ffm->packet + ffm->packet_size - FFM_HEADER_SIZE;
227 71c32f19 Michael Niedermayer
    assert(ffm->packet_end >= ffm->packet);
228 de6d9b64 Fabrice Bellard
    ffm->frame_offset = 0;
229
    ffm->pts = 0;
230
    ffm->first_packet = 1;
231
232
    return 0;
233
 fail:
234
    for(i=0;i<s->nb_streams;i++) {
235
        st = s->streams[i];
236 789bee12 Philip Gladstone
        av_freep(&st->priv_data);
237 de6d9b64 Fabrice Bellard
    }
238
    return -1;
239
}
240
241 e928649b Michael Niedermayer
static int ffm_write_packet(AVFormatContext *s, AVPacket *pkt)
242 de6d9b64 Fabrice Bellard
{
243 e928649b Michael Niedermayer
    AVStream *st = s->streams[pkt->stream_index];
244 de6d9b64 Fabrice Bellard
    FFMStream *fst = st->priv_data;
245 0c1a9eda Zdenek Kabelac
    int64_t pts;
246
    uint8_t header[FRAME_HEADER_SIZE];
247 20f01548 Philip Gladstone
    int duration;
248 e928649b Michael Niedermayer
    int size= pkt->size;
249 20f01548 Philip Gladstone
250 e928649b Michael Niedermayer
    //XXX/FIXME use duration from pkt
251 01f4895c Michael Niedermayer
    if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
252
        duration = ((float)st->codec->frame_size / st->codec->sample_rate * 1000000.0);
253 20f01548 Philip Gladstone
    } else {
254 01f4895c Michael Niedermayer
        duration = (1000000.0 * st->codec->time_base.num / (float)st->codec->time_base.den);
255 20f01548 Philip Gladstone
    }
256 de6d9b64 Fabrice Bellard
257
    pts = fst->pts;
258
    /* packet size & key_frame */
259 e928649b Michael Niedermayer
    header[0] = pkt->stream_index;
260 de6d9b64 Fabrice Bellard
    header[1] = 0;
261 e928649b Michael Niedermayer
    if (pkt->flags & PKT_FLAG_KEY)
262 de6d9b64 Fabrice Bellard
        header[1] |= FLAG_KEY_FRAME;
263
    header[2] = (size >> 16) & 0xff;
264
    header[3] = (size >> 8) & 0xff;
265
    header[4] = size & 0xff;
266 20f01548 Philip Gladstone
    header[5] = (duration >> 16) & 0xff;
267
    header[6] = (duration >> 8) & 0xff;
268
    header[7] = duration & 0xff;
269 de6d9b64 Fabrice Bellard
    ffm_write_data(s, header, FRAME_HEADER_SIZE, pts, 1);
270 e928649b Michael Niedermayer
    ffm_write_data(s, pkt->data, size, pts, 0);
271 de6d9b64 Fabrice Bellard
272 20f01548 Philip Gladstone
    fst->pts += duration;
273 de6d9b64 Fabrice Bellard
    return 0;
274
}
275
276
static int ffm_write_trailer(AVFormatContext *s)
277
{
278
    ByteIOContext *pb = &s->pb;
279
    FFMContext *ffm = s->priv_data;
280
281
    /* flush packets */
282
    if (ffm->packet_ptr > ffm->packet)
283
        flush_packet(s);
284
285
    put_flush_packet(pb);
286
287 66d2ff2a Fabrice Bellard
    if (!url_is_streamed(pb)) {
288 0c1a9eda Zdenek Kabelac
        int64_t size;
289 66d2ff2a Fabrice Bellard
        /* update the write offset */
290
        size = url_ftell(pb);
291
        url_fseek(pb, 8, SEEK_SET);
292
        put_be64(pb, size);
293
        put_flush_packet(pb);
294
    }
295
296 de6d9b64 Fabrice Bellard
    return 0;
297
}
298 a9e35095 Diego Biurrun
#endif //CONFIG_MUXERS
299 de6d9b64 Fabrice Bellard
300
/* ffm demux */
301
302
static int ffm_is_avail_data(AVFormatContext *s, int size)
303
{
304
    FFMContext *ffm = s->priv_data;
305
    offset_t pos, avail_size;
306
    int len;
307
308
    len = ffm->packet_end - ffm->packet_ptr;
309 66d2ff2a Fabrice Bellard
    if (!ffm_nopts) {
310
        /* XXX: I don't understand this test, so I disabled it for testing */
311
        if (size <= len)
312
            return 1;
313
    }
314 de6d9b64 Fabrice Bellard
    pos = url_ftell(&s->pb);
315
    if (pos == ffm->write_index) {
316
        /* exactly at the end of stream */
317
        return 0;
318
    } else if (pos < ffm->write_index) {
319
        avail_size = ffm->write_index - pos;
320
    } else {
321
        avail_size = (ffm->file_size - pos) + (ffm->write_index - FFM_PACKET_SIZE);
322
    }
323
    avail_size = (avail_size / ffm->packet_size) * (ffm->packet_size - FFM_HEADER_SIZE) + len;
324
    if (size <= avail_size)
325
        return 1;
326
    else
327
        return 0;
328
}
329
330
/* first is true if we read the frame header */
331 4606ac8d Zdenek Kabelac
static int ffm_read_data(AVFormatContext *s,
332 0c1a9eda Zdenek Kabelac
                         uint8_t *buf, int size, int first)
333 de6d9b64 Fabrice Bellard
{
334
    FFMContext *ffm = s->priv_data;
335
    ByteIOContext *pb = &s->pb;
336
    int len, fill_size, size1, frame_offset;
337
338
    size1 = size;
339
    while (size > 0) {
340
    redo:
341
        len = ffm->packet_end - ffm->packet_ptr;
342
        if (len > size)
343
            len = size;
344
        if (len == 0) {
345
            if (url_ftell(pb) == ffm->file_size)
346
                url_fseek(pb, ffm->packet_size, SEEK_SET);
347 5e57424d Philip Gladstone
    retry_read:
348 de6d9b64 Fabrice Bellard
            get_be16(pb); /* PACKET_ID */
349
            fill_size = get_be16(pb);
350
            ffm->pts = get_be64(pb);
351 d271481f Michael Niedermayer
            ffm->first_frame_in_packet = 1;
352 de6d9b64 Fabrice Bellard
            frame_offset = get_be16(pb);
353
            get_buffer(pb, ffm->packet, ffm->packet_size - FFM_HEADER_SIZE);
354
            ffm->packet_end = ffm->packet + (ffm->packet_size - FFM_HEADER_SIZE - fill_size);
355 91628427 Philip Gladstone
            if (ffm->packet_end < ffm->packet)
356 71c32f19 Michael Niedermayer
                return -1;
357 de6d9b64 Fabrice Bellard
            /* if first packet or resynchronization packet, we must
358
               handle it specifically */
359
            if (ffm->first_packet || (frame_offset & 0x8000)) {
360 5e57424d Philip Gladstone
                if (!frame_offset) {
361
                    /* This packet has no frame headers in it */
362
                    if (url_ftell(pb) >= ffm->packet_size * 3) {
363
                        url_fseek(pb, -ffm->packet_size * 2, SEEK_CUR);
364
                        goto retry_read;
365
                    }
366
                    /* This is bad, we cannot find a valid frame header */
367
                    return 0;
368
                }
369 de6d9b64 Fabrice Bellard
                ffm->first_packet = 0;
370 5e57424d Philip Gladstone
                if ((frame_offset & 0x7ffff) < FFM_HEADER_SIZE)
371 71c32f19 Michael Niedermayer
                    return -1;
372 de6d9b64 Fabrice Bellard
                ffm->packet_ptr = ffm->packet + (frame_offset & 0x7fff) - FFM_HEADER_SIZE;
373
                if (!first)
374
                    break;
375
            } else {
376
                ffm->packet_ptr = ffm->packet;
377
            }
378
            goto redo;
379
        }
380
        memcpy(buf, ffm->packet_ptr, len);
381
        buf += len;
382
        ffm->packet_ptr += len;
383
        size -= len;
384
        first = 0;
385
    }
386
    return size1 - size;
387
}
388
389
390 91628427 Philip Gladstone
static void adjust_write_index(AVFormatContext *s)
391
{
392
    FFMContext *ffm = s->priv_data;
393
    ByteIOContext *pb = &s->pb;
394
    int64_t pts;
395
    //offset_t orig_write_index = ffm->write_index;
396
    offset_t pos_min, pos_max;
397
    int64_t pts_start;
398
    offset_t ptr = url_ftell(pb);
399
400
401
    pos_min = 0;
402
    pos_max = ffm->file_size - 2 * FFM_PACKET_SIZE;
403
404
    pts_start = get_pts(s, pos_min);
405
406
    pts = get_pts(s, pos_max);
407
408 115329f1 Diego Biurrun
    if (pts - 100000 > pts_start)
409 79292510 Michael Niedermayer
        goto end;
410 91628427 Philip Gladstone
411
    ffm->write_index = FFM_PACKET_SIZE;
412
413
    pts_start = get_pts(s, pos_min);
414
415
    pts = get_pts(s, pos_max);
416
417
    if (pts - 100000 <= pts_start) {
418
        while (1) {
419
            offset_t newpos;
420
            int64_t newpts;
421
422
            newpos = ((pos_max + pos_min) / (2 * FFM_PACKET_SIZE)) * FFM_PACKET_SIZE;
423
424
            if (newpos == pos_min)
425
                break;
426
427
            newpts = get_pts(s, newpos);
428
429
            if (newpts - 100000 <= pts) {
430
                pos_max = newpos;
431
                pts = newpts;
432
            } else {
433
                pos_min = newpos;
434
            }
435
        }
436
        ffm->write_index += pos_max;
437
    }
438
439
    //printf("Adjusted write index from %lld to %lld: pts=%0.6f\n", orig_write_index, ffm->write_index, pts / 1000000.);
440
    //printf("pts range %0.6f - %0.6f\n", get_pts(s, 0) / 1000000. , get_pts(s, ffm->file_size - 2 * FFM_PACKET_SIZE) / 1000000. );
441
442 79292510 Michael Niedermayer
 end:
443 91628427 Philip Gladstone
    url_fseek(pb, ptr, SEEK_SET);
444
}
445
446
447 de6d9b64 Fabrice Bellard
static int ffm_read_header(AVFormatContext *s, AVFormatParameters *ap)
448
{
449 c9a65ca8 Fabrice Bellard
    FFMContext *ffm = s->priv_data;
450 de6d9b64 Fabrice Bellard
    AVStream *st;
451
    FFMStream *fst;
452
    ByteIOContext *pb = &s->pb;
453
    AVCodecContext *codec;
454 fa26a29d Fabrice Bellard
    int i, nb_streams;
455 0c1a9eda Zdenek Kabelac
    uint32_t tag;
456 de6d9b64 Fabrice Bellard
457
    /* header */
458
    tag = get_le32(pb);
459
    if (tag != MKTAG('F', 'F', 'M', '1'))
460
        goto fail;
461
    ffm->packet_size = get_be32(pb);
462
    if (ffm->packet_size != FFM_PACKET_SIZE)
463
        goto fail;
464
    ffm->write_index = get_be64(pb);
465
    /* get also filesize */
466
    if (!url_is_streamed(pb)) {
467 a965c478 Aurelien Jacobs
        ffm->file_size = url_fsize(pb);
468 91628427 Philip Gladstone
        adjust_write_index(s);
469 de6d9b64 Fabrice Bellard
    } else {
470 0c1a9eda Zdenek Kabelac
        ffm->file_size = (uint64_t_C(1) << 63) - 1;
471 de6d9b64 Fabrice Bellard
    }
472
473 fa26a29d Fabrice Bellard
    nb_streams = get_be32(pb);
474 de6d9b64 Fabrice Bellard
    get_be32(pb); /* total bitrate */
475
    /* read each stream */
476 fa26a29d Fabrice Bellard
    for(i=0;i<nb_streams;i++) {
477 75bdb984 Philip Gladstone
        char rc_eq_buf[128];
478
479 fa26a29d Fabrice Bellard
        st = av_new_stream(s, 0);
480 de6d9b64 Fabrice Bellard
        if (!st)
481
            goto fail;
482 16300e23 Philip Gladstone
        fst = av_mallocz(sizeof(FFMStream));
483 de6d9b64 Fabrice Bellard
        if (!fst)
484
            goto fail;
485 26aa0f89 Alex Beregszaszi
        s->streams[i] = st;
486 115329f1 Diego Biurrun
487 e928649b Michael Niedermayer
        av_set_pts_info(st, 64, 1, 1000000);
488 115329f1 Diego Biurrun
489 de6d9b64 Fabrice Bellard
        st->priv_data = fst;
490
491 01f4895c Michael Niedermayer
        codec = st->codec;
492 de6d9b64 Fabrice Bellard
        /* generic info */
493 26aa0f89 Alex Beregszaszi
        codec->codec_id = get_be32(pb);
494
        codec->codec_type = get_byte(pb); /* codec_type */
495 de6d9b64 Fabrice Bellard
        codec->bit_rate = get_be32(pb);
496 26aa0f89 Alex Beregszaszi
        st->quality = get_be32(pb);
497 ccac2e27 Philip Gladstone
        codec->flags = get_be32(pb);
498 22332126 Philip Gladstone
        codec->flags2 = get_be32(pb);
499
        codec->debug = get_be32(pb);
500 de6d9b64 Fabrice Bellard
        /* specific info */
501
        switch(codec->codec_type) {
502
        case CODEC_TYPE_VIDEO:
503 c0df9d75 Michael Niedermayer
            codec->time_base.num = get_be32(pb);
504
            codec->time_base.den = get_be32(pb);
505 de6d9b64 Fabrice Bellard
            codec->width = get_be16(pb);
506
            codec->height = get_be16(pb);
507 20f01548 Philip Gladstone
            codec->gop_size = get_be16(pb);
508 22332126 Philip Gladstone
            codec->pix_fmt = get_be32(pb);
509 20f01548 Philip Gladstone
            codec->qmin = get_byte(pb);
510
            codec->qmax = get_byte(pb);
511
            codec->max_qdiff = get_byte(pb);
512
            codec->qcompress = get_be16(pb) / 10000.0;
513
            codec->qblur = get_be16(pb) / 10000.0;
514 3884a3c3 Philip Gladstone
            codec->bit_rate_tolerance = get_be32(pb);
515 e9a9e0c2 Fabrice Bellard
            codec->rc_eq = av_strdup(get_strz(pb, rc_eq_buf, sizeof(rc_eq_buf)));
516 75bdb984 Philip Gladstone
            codec->rc_max_rate = get_be32(pb);
517
            codec->rc_min_rate = get_be32(pb);
518
            codec->rc_buffer_size = get_be32(pb);
519 7cb8f314 Michael Niedermayer
            codec->i_quant_factor = av_int2dbl(get_be64(pb));
520
            codec->b_quant_factor = av_int2dbl(get_be64(pb));
521
            codec->i_quant_offset = av_int2dbl(get_be64(pb));
522
            codec->b_quant_offset = av_int2dbl(get_be64(pb));
523 75bdb984 Philip Gladstone
            codec->dct_algo = get_be32(pb);
524 22332126 Philip Gladstone
            codec->strict_std_compliance = get_be32(pb);
525
            codec->max_b_frames = get_be32(pb);
526
            codec->luma_elim_threshold = get_be32(pb);
527
            codec->chroma_elim_threshold = get_be32(pb);
528
            codec->mpeg_quant = get_be32(pb);
529
            codec->intra_dc_precision = get_be32(pb);
530
            codec->me_method = get_be32(pb);
531
            codec->mb_decision = get_be32(pb);
532
            codec->nsse_weight = get_be32(pb);
533
            codec->frame_skip_cmp = get_be32(pb);
534 7cb8f314 Michael Niedermayer
            codec->rc_buffer_aggressivity = av_int2dbl(get_be64(pb));
535 de6d9b64 Fabrice Bellard
            break;
536
        case CODEC_TYPE_AUDIO:
537
            codec->sample_rate = get_be32(pb);
538
            codec->channels = get_le16(pb);
539 20f01548 Philip Gladstone
            codec->frame_size = get_le16(pb);
540 de6d9b64 Fabrice Bellard
            break;
541 20f01548 Philip Gladstone
        default:
542 75bdb984 Philip Gladstone
            goto fail;
543 de6d9b64 Fabrice Bellard
        }
544
545
    }
546
547
    /* get until end of block reached */
548
    while ((url_ftell(pb) % ffm->packet_size) != 0)
549
        get_byte(pb);
550
551
    /* init packet demux */
552
    ffm->packet_ptr = ffm->packet;
553
    ffm->packet_end = ffm->packet;
554
    ffm->frame_offset = 0;
555
    ffm->pts = 0;
556
    ffm->read_state = READ_HEADER;
557
    ffm->first_packet = 1;
558
    return 0;
559
 fail:
560
    for(i=0;i<s->nb_streams;i++) {
561
        st = s->streams[i];
562
        if (st) {
563 789bee12 Philip Gladstone
            av_freep(&st->priv_data);
564 1ea4f593 Fabrice Bellard
            av_free(st);
565 de6d9b64 Fabrice Bellard
        }
566
    }
567
    return -1;
568
}
569
570
/* return < 0 if eof */
571
static int ffm_read_packet(AVFormatContext *s, AVPacket *pkt)
572
{
573
    int size;
574
    FFMContext *ffm = s->priv_data;
575 20f01548 Philip Gladstone
    int duration;
576 de6d9b64 Fabrice Bellard
577
    switch(ffm->read_state) {
578
    case READ_HEADER:
579 66d2ff2a Fabrice Bellard
        if (!ffm_is_avail_data(s, FRAME_HEADER_SIZE)) {
580 de6d9b64 Fabrice Bellard
            return -EAGAIN;
581 66d2ff2a Fabrice Bellard
        }
582 de6d9b64 Fabrice Bellard
#if 0
583 4606ac8d Zdenek Kabelac
        printf("pos=%08Lx spos=%Lx, write_index=%Lx size=%Lx\n",
584 de6d9b64 Fabrice Bellard
               url_ftell(&s->pb), s->pb.pos, ffm->write_index, ffm->file_size);
585
#endif
586 115329f1 Diego Biurrun
        if (ffm_read_data(s, ffm->header, FRAME_HEADER_SIZE, 1) !=
587 66d2ff2a Fabrice Bellard
            FRAME_HEADER_SIZE)
588 de6d9b64 Fabrice Bellard
            return -EAGAIN;
589
#if 0
590
        {
591
            int i;
592
            for(i=0;i<FRAME_HEADER_SIZE;i++)
593
                printf("%02x ", ffm->header[i]);
594
            printf("\n");
595
        }
596
#endif
597
        ffm->read_state = READ_DATA;
598
        /* fall thru */
599
    case READ_DATA:
600
        size = (ffm->header[2] << 16) | (ffm->header[3] << 8) | ffm->header[4];
601
        if (!ffm_is_avail_data(s, size)) {
602
            return -EAGAIN;
603
        }
604
605 20f01548 Philip Gladstone
        duration = (ffm->header[5] << 16) | (ffm->header[6] << 8) | ffm->header[7];
606
607 de6d9b64 Fabrice Bellard
        av_new_packet(pkt, size);
608
        pkt->stream_index = ffm->header[0];
609 115329f1 Diego Biurrun
        pkt->pos = url_ftell(&s->pb);
610 de6d9b64 Fabrice Bellard
        if (ffm->header[1] & FLAG_KEY_FRAME)
611
            pkt->flags |= PKT_FLAG_KEY;
612 4606ac8d Zdenek Kabelac
613 de6d9b64 Fabrice Bellard
        ffm->read_state = READ_HEADER;
614
        if (ffm_read_data(s, pkt->data, size, 0) != size) {
615
            /* bad case: desynchronized packet. we cancel all the packet loading */
616
            av_free_packet(pkt);
617
            return -EAGAIN;
618
        }
619 d271481f Michael Niedermayer
        if (ffm->first_frame_in_packet)
620
        {
621
            pkt->pts = ffm->pts;
622
            ffm->first_frame_in_packet = 0;
623
        }
624 20f01548 Philip Gladstone
        pkt->duration = duration;
625 de6d9b64 Fabrice Bellard
        break;
626
    }
627
    return 0;
628
}
629
630
//#define DEBUG_SEEK
631
632
/* pos is between 0 and file_size - FFM_PACKET_SIZE. It is translated
633
   by the write position inside this function */
634
static void ffm_seek1(AVFormatContext *s, offset_t pos1)
635
{
636
    FFMContext *ffm = s->priv_data;
637
    ByteIOContext *pb = &s->pb;
638
    offset_t pos;
639
640
    pos = pos1 + ffm->write_index;
641
    if (pos >= ffm->file_size)
642
        pos -= (ffm->file_size - FFM_PACKET_SIZE);
643
#ifdef DEBUG_SEEK
644
    printf("seek to %Lx -> %Lx\n", pos1, pos);
645
#endif
646
    url_fseek(pb, pos, SEEK_SET);
647
}
648
649 0c1a9eda Zdenek Kabelac
static int64_t get_pts(AVFormatContext *s, offset_t pos)
650 de6d9b64 Fabrice Bellard
{
651
    ByteIOContext *pb = &s->pb;
652 0c1a9eda Zdenek Kabelac
    int64_t pts;
653 de6d9b64 Fabrice Bellard
654 4606ac8d Zdenek Kabelac
    ffm_seek1(s, pos);
655 de6d9b64 Fabrice Bellard
    url_fskip(pb, 4);
656
    pts = get_be64(pb);
657
#ifdef DEBUG_SEEK
658
    printf("pts=%0.6f\n", pts / 1000000.0);
659
#endif
660
    return pts;
661
}
662
663
/* seek to a given time in the file. The file read pointer is
664
   positionned at or before pts. XXX: the following code is quite
665
   approximative */
666 7b3c1382 Michael Niedermayer
static int ffm_seek(AVFormatContext *s, int stream_index, int64_t wanted_pts, int flags)
667 de6d9b64 Fabrice Bellard
{
668
    FFMContext *ffm = s->priv_data;
669
    offset_t pos_min, pos_max, pos;
670 0c1a9eda Zdenek Kabelac
    int64_t pts_min, pts_max, pts;
671 de6d9b64 Fabrice Bellard
    double pos1;
672
673
#ifdef DEBUG_SEEK
674
    printf("wanted_pts=%0.6f\n", wanted_pts / 1000000.0);
675
#endif
676
    /* find the position using linear interpolation (better than
677
       dichotomy in typical cases) */
678
    pos_min = 0;
679
    pos_max = ffm->file_size - 2 * FFM_PACKET_SIZE;
680
    while (pos_min <= pos_max) {
681
        pts_min = get_pts(s, pos_min);
682
        pts_max = get_pts(s, pos_max);
683
        /* linear interpolation */
684 4606ac8d Zdenek Kabelac
        pos1 = (double)(pos_max - pos_min) * (double)(wanted_pts - pts_min) /
685 de6d9b64 Fabrice Bellard
            (double)(pts_max - pts_min);
686 0c1a9eda Zdenek Kabelac
        pos = (((int64_t)pos1) / FFM_PACKET_SIZE) * FFM_PACKET_SIZE;
687 de6d9b64 Fabrice Bellard
        if (pos <= pos_min)
688
            pos = pos_min;
689
        else if (pos >= pos_max)
690
            pos = pos_max;
691
        pts = get_pts(s, pos);
692
        /* check if we are lucky */
693
        if (pts == wanted_pts) {
694
            goto found;
695
        } else if (pts > wanted_pts) {
696
            pos_max = pos - FFM_PACKET_SIZE;
697
        } else {
698
            pos_min = pos + FFM_PACKET_SIZE;
699
        }
700
    }
701 7b3c1382 Michael Niedermayer
    pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max;
702 de6d9b64 Fabrice Bellard
    if (pos > 0)
703
        pos -= FFM_PACKET_SIZE;
704
 found:
705
    ffm_seek1(s, pos);
706
    return 0;
707
}
708
709 04f46ced Gildas Bazin
#ifdef CONFIG_FFSERVER
710 de6d9b64 Fabrice Bellard
offset_t ffm_read_write_index(int fd)
711
{
712 0c1a9eda Zdenek Kabelac
    uint8_t buf[8];
713 de6d9b64 Fabrice Bellard
    offset_t pos;
714
    int i;
715
716
    lseek(fd, 8, SEEK_SET);
717
    read(fd, buf, 8);
718
    pos = 0;
719 4606ac8d Zdenek Kabelac
    for(i=0;i<8;i++)
720 fa26a29d Fabrice Bellard
        pos |= (int64_t)buf[i] << (56 - i * 8);
721 de6d9b64 Fabrice Bellard
    return pos;
722
}
723
724
void ffm_write_write_index(int fd, offset_t pos)
725
{
726 0c1a9eda Zdenek Kabelac
    uint8_t buf[8];
727 de6d9b64 Fabrice Bellard
    int i;
728
729 4606ac8d Zdenek Kabelac
    for(i=0;i<8;i++)
730 de6d9b64 Fabrice Bellard
        buf[i] = (pos >> (56 - i * 8)) & 0xff;
731
    lseek(fd, 8, SEEK_SET);
732
    write(fd, buf, 8);
733
}
734
735
void ffm_set_write_index(AVFormatContext *s, offset_t pos, offset_t file_size)
736
{
737
    FFMContext *ffm = s->priv_data;
738
    ffm->write_index = pos;
739
    ffm->file_size = file_size;
740
}
741 04f46ced Gildas Bazin
#endif // CONFIG_FFSERVER
742 de6d9b64 Fabrice Bellard
743
static int ffm_read_close(AVFormatContext *s)
744
{
745
    AVStream *st;
746
    int i;
747
748
    for(i=0;i<s->nb_streams;i++) {
749
        st = s->streams[i];
750 789bee12 Philip Gladstone
        av_freep(&st->priv_data);
751 de6d9b64 Fabrice Bellard
    }
752
    return 0;
753
}
754
755 07c4ed85 Philip Gladstone
static int ffm_probe(AVProbeData *p)
756
{
757 66d2ff2a Fabrice Bellard
    if (p->buf_size >= 4 &&
758 115329f1 Diego Biurrun
        p->buf[0] == 'F' && p->buf[1] == 'F' && p->buf[2] == 'M' &&
759 66d2ff2a Fabrice Bellard
        p->buf[3] == '1')
760 07c4ed85 Philip Gladstone
        return AVPROBE_SCORE_MAX + 1;
761
    return 0;
762
}
763
764 c18a2692 Zdenek Kabelac
static AVInputFormat ffm_iformat = {
765 c9a65ca8 Fabrice Bellard
    "ffm",
766
    "ffm format",
767 66d2ff2a Fabrice Bellard
    sizeof(FFMContext),
768 07c4ed85 Philip Gladstone
    ffm_probe,
769 c9a65ca8 Fabrice Bellard
    ffm_read_header,
770
    ffm_read_packet,
771
    ffm_read_close,
772
    ffm_seek,
773
};
774
775 a9e35095 Diego Biurrun
#ifdef CONFIG_MUXERS
776 c18a2692 Zdenek Kabelac
static AVOutputFormat ffm_oformat = {
777 de6d9b64 Fabrice Bellard
    "ffm",
778
    "ffm format",
779
    "",
780
    "ffm",
781 66d2ff2a Fabrice Bellard
    sizeof(FFMContext),
782 de6d9b64 Fabrice Bellard
    /* not really used */
783
    CODEC_ID_MP2,
784
    CODEC_ID_MPEG1VIDEO,
785
    ffm_write_header,
786
    ffm_write_packet,
787
    ffm_write_trailer,
788
};
789 a9e35095 Diego Biurrun
#endif //CONFIG_MUXERS
790 c9a65ca8 Fabrice Bellard
791
int ffm_init(void)
792
{
793
    av_register_input_format(&ffm_iformat);
794 a9e35095 Diego Biurrun
#ifdef CONFIG_MUXERS
795 c9a65ca8 Fabrice Bellard
    av_register_output_format(&ffm_oformat);
796 a9e35095 Diego Biurrun
#endif //CONFIG_MUXERS
797 c9a65ca8 Fabrice Bellard
    return 0;
798
}