ffserver fixes by (Koos Vriezen <koos.vriezen at xs4all dot nl>)
[libav.git] / libavformat / ffm.c
CommitLineData
de6d9b64
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1/*
2 * FFM (ffserver live feed) encoder and decoder
66d2ff2a 3 * Copyright (c) 2001 Fabrice Bellard.
de6d9b64 4 *
66d2ff2a
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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
8 * version 2 of the License, or (at your option) any later version.
de6d9b64 9 *
66d2ff2a 10 * This library is distributed in the hope that it will be useful,
de6d9b64 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
66d2ff2a
FB
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
de6d9b64 14 *
66d2ff2a
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15 * 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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
de6d9b64 18 */
de6d9b64 19#include "avformat.h"
8be1c656 20#include <unistd.h>
de6d9b64
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21
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 */
20f01548 27#define FRAME_HEADER_SIZE 8
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28#define FLAG_KEY_FRAME 0x01
29
30typedef struct FFMStream {
0c1a9eda 31 int64_t pts;
de6d9b64
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32} FFMStream;
33
34enum {
35 READ_HEADER,
36 READ_DATA,
37};
38
39typedef struct FFMContext {
40 /* only reading mode */
41 offset_t write_index, file_size;
4606ac8d 42 int read_state;
0c1a9eda 43 uint8_t header[FRAME_HEADER_SIZE];
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44
45 /* read and write */
46 int first_packet; /* true if first packet, needed to set the discontinuity tag */
47 int packet_size;
48 int frame_offset;
0c1a9eda
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49 int64_t pts;
50 uint8_t *packet_ptr, *packet_end;
51 uint8_t packet[FFM_PACKET_SIZE];
de6d9b64
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52} FFMContext;
53
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PG
54static int64_t get_pts(AVFormatContext *s, offset_t pos);
55
c9a65ca8
FB
56/* disable pts hack for testing */
57int ffm_nopts = 0;
58
764ef400 59#ifdef CONFIG_ENCODERS
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60static void flush_packet(AVFormatContext *s)
61{
62 FFMContext *ffm = s->priv_data;
63 int fill_size, h;
64 ByteIOContext *pb = &s->pb;
65
66 fill_size = ffm->packet_end - ffm->packet_ptr;
67 memset(ffm->packet_ptr, 0, fill_size);
4606ac8d 68
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PG
69 if (url_ftell(pb) % ffm->packet_size)
70 av_abort();
71
de6d9b64 72 /* put header */
4606ac8d 73 put_be16(pb, PACKET_ID);
de6d9b64
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74 put_be16(pb, fill_size);
75 put_be64(pb, ffm->pts);
76 h = ffm->frame_offset;
77 if (ffm->first_packet)
78 h |= 0x8000;
79 put_be16(pb, h);
80 put_buffer(pb, ffm->packet, ffm->packet_end - ffm->packet);
81
82 /* prepare next packet */
83 ffm->frame_offset = 0; /* no key frame */
84 ffm->pts = 0; /* no pts */
85 ffm->packet_ptr = ffm->packet;
86 ffm->first_packet = 0;
87}
88
89/* 'first' is true if first data of a frame */
4606ac8d 90static void ffm_write_data(AVFormatContext *s,
49057904 91 const uint8_t *buf, int size,
0c1a9eda 92 int64_t pts, int first)
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FB
93{
94 FFMContext *ffm = s->priv_data;
95 int len;
96
97 if (first && ffm->frame_offset == 0)
98 ffm->frame_offset = ffm->packet_ptr - ffm->packet + FFM_HEADER_SIZE;
99 if (first && ffm->pts == 0)
100 ffm->pts = pts;
101
102 /* write as many packets as needed */
103 while (size > 0) {
104 len = ffm->packet_end - ffm->packet_ptr;
105 if (len > size)
106 len = size;
107 memcpy(ffm->packet_ptr, buf, len);
4606ac8d 108
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109 ffm->packet_ptr += len;
110 buf += len;
111 size -= len;
112 if (ffm->packet_ptr >= ffm->packet_end) {
113 /* special case : no pts in packet : we leave the current one */
114 if (ffm->pts == 0)
115 ffm->pts = pts;
116
117 flush_packet(s);
118 }
119 }
120}
121
122static int ffm_write_header(AVFormatContext *s)
123{
c9a65ca8 124 FFMContext *ffm = s->priv_data;
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125 AVStream *st;
126 FFMStream *fst;
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127 ByteIOContext *pb = &s->pb;
128 AVCodecContext *codec;
129 int bit_rate, i;
130
de6d9b64 131 ffm->packet_size = FFM_PACKET_SIZE;
4606ac8d 132
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133 /* header */
134 put_tag(pb, "FFM1");
135 put_be32(pb, ffm->packet_size);
136 /* XXX: store write position in other file ? */
137 put_be64(pb, ffm->packet_size); /* current write position */
138
139 put_be32(pb, s->nb_streams);
140 bit_rate = 0;
141 for(i=0;i<s->nb_streams;i++) {
142 st = s->streams[i];
143 bit_rate += st->codec.bit_rate;
144 }
145 put_be32(pb, bit_rate);
146
147 /* list of streams */
148 for(i=0;i<s->nb_streams;i++) {
149 st = s->streams[i];
16300e23 150 fst = av_mallocz(sizeof(FFMStream));
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151 if (!fst)
152 goto fail;
53e2f9ca 153 av_set_pts_info(st, 64, 1, 1000000);
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154 st->priv_data = fst;
155
156 codec = &st->codec;
157 /* generic info */
158 put_be32(pb, codec->codec_id);
159 put_byte(pb, codec->codec_type);
160 put_be32(pb, codec->bit_rate);
1e491e29 161 put_be32(pb, st->quality);
ccac2e27 162 put_be32(pb, codec->flags);
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163 /* specific info */
164 switch(codec->codec_type) {
165 case CODEC_TYPE_VIDEO:
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166 put_be32(pb, codec->frame_rate_base);
167 put_be32(pb, codec->frame_rate);
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168 put_be16(pb, codec->width);
169 put_be16(pb, codec->height);
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PG
170 put_be16(pb, codec->gop_size);
171 put_byte(pb, codec->qmin);
172 put_byte(pb, codec->qmax);
173 put_byte(pb, codec->max_qdiff);
174 put_be16(pb, (int) (codec->qcompress * 10000.0));
175 put_be16(pb, (int) (codec->qblur * 10000.0));
3884a3c3 176 put_be32(pb, codec->bit_rate_tolerance);
3b4b29dc 177 put_strz(pb, codec->rc_eq);
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178 put_be32(pb, codec->rc_max_rate);
179 put_be32(pb, codec->rc_min_rate);
180 put_be32(pb, codec->rc_buffer_size);
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181 put_be64_double(pb, codec->i_quant_factor);
182 put_be64_double(pb, codec->b_quant_factor);
183 put_be64_double(pb, codec->i_quant_offset);
184 put_be64_double(pb, codec->b_quant_offset);
75bdb984 185 put_be32(pb, codec->dct_algo);
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186 break;
187 case CODEC_TYPE_AUDIO:
188 put_be32(pb, codec->sample_rate);
189 put_le16(pb, codec->channels);
20f01548 190 put_le16(pb, codec->frame_size);
de6d9b64 191 break;
20f01548 192 default:
789bee12 193 av_abort();
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194 }
195 /* hack to have real time */
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196 if (ffm_nopts)
197 fst->pts = 0;
198 else
a11bf0bd 199 fst->pts = av_gettime();
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200 }
201
202 /* flush until end of block reached */
203 while ((url_ftell(pb) % ffm->packet_size) != 0)
204 put_byte(pb, 0);
205
206 put_flush_packet(pb);
207
208 /* init packet mux */
209 ffm->packet_ptr = ffm->packet;
210 ffm->packet_end = ffm->packet + ffm->packet_size - FFM_HEADER_SIZE;
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PG
211 if (ffm->packet_end < ffm->packet)
212 av_abort();
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213 ffm->frame_offset = 0;
214 ffm->pts = 0;
215 ffm->first_packet = 1;
216
217 return 0;
218 fail:
219 for(i=0;i<s->nb_streams;i++) {
220 st = s->streams[i];
789bee12 221 av_freep(&st->priv_data);
de6d9b64 222 }
de6d9b64
FB
223 return -1;
224}
225
e928649b 226static int ffm_write_packet(AVFormatContext *s, AVPacket *pkt)
de6d9b64 227{
e928649b 228 AVStream *st = s->streams[pkt->stream_index];
de6d9b64 229 FFMStream *fst = st->priv_data;
0c1a9eda
ZK
230 int64_t pts;
231 uint8_t header[FRAME_HEADER_SIZE];
20f01548 232 int duration;
e928649b 233 int size= pkt->size;
20f01548 234
e928649b 235 //XXX/FIXME use duration from pkt
20f01548
PG
236 if (st->codec.codec_type == CODEC_TYPE_AUDIO) {
237 duration = ((float)st->codec.frame_size / st->codec.sample_rate * 1000000.0);
238 } else {
14bea432 239 duration = (1000000.0 * st->codec.frame_rate_base / (float)st->codec.frame_rate);
20f01548 240 }
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241
242 pts = fst->pts;
243 /* packet size & key_frame */
e928649b 244 header[0] = pkt->stream_index;
de6d9b64 245 header[1] = 0;
e928649b 246 if (pkt->flags & PKT_FLAG_KEY)
de6d9b64
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247 header[1] |= FLAG_KEY_FRAME;
248 header[2] = (size >> 16) & 0xff;
249 header[3] = (size >> 8) & 0xff;
250 header[4] = size & 0xff;
20f01548
PG
251 header[5] = (duration >> 16) & 0xff;
252 header[6] = (duration >> 8) & 0xff;
253 header[7] = duration & 0xff;
de6d9b64 254 ffm_write_data(s, header, FRAME_HEADER_SIZE, pts, 1);
e928649b 255 ffm_write_data(s, pkt->data, size, pts, 0);
de6d9b64 256
20f01548 257 fst->pts += duration;
de6d9b64
FB
258 return 0;
259}
260
261static int ffm_write_trailer(AVFormatContext *s)
262{
263 ByteIOContext *pb = &s->pb;
264 FFMContext *ffm = s->priv_data;
265 int i;
266
267 /* flush packets */
268 if (ffm->packet_ptr > ffm->packet)
269 flush_packet(s);
270
271 put_flush_packet(pb);
272
66d2ff2a 273 if (!url_is_streamed(pb)) {
0c1a9eda 274 int64_t size;
66d2ff2a
FB
275 /* update the write offset */
276 size = url_ftell(pb);
277 url_fseek(pb, 8, SEEK_SET);
278 put_be64(pb, size);
279 put_flush_packet(pb);
280 }
281
de6d9b64 282 for(i=0;i<s->nb_streams;i++)
789bee12 283 av_freep(&s->streams[i]->priv_data);
de6d9b64
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284 return 0;
285}
764ef400 286#endif //CONFIG_ENCODERS
de6d9b64
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287
288/* ffm demux */
289
290static int ffm_is_avail_data(AVFormatContext *s, int size)
291{
292 FFMContext *ffm = s->priv_data;
293 offset_t pos, avail_size;
294 int len;
295
296 len = ffm->packet_end - ffm->packet_ptr;
66d2ff2a
FB
297 if (!ffm_nopts) {
298 /* XXX: I don't understand this test, so I disabled it for testing */
299 if (size <= len)
300 return 1;
301 }
de6d9b64
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302 pos = url_ftell(&s->pb);
303 if (pos == ffm->write_index) {
304 /* exactly at the end of stream */
305 return 0;
306 } else if (pos < ffm->write_index) {
307 avail_size = ffm->write_index - pos;
308 } else {
309 avail_size = (ffm->file_size - pos) + (ffm->write_index - FFM_PACKET_SIZE);
310 }
311 avail_size = (avail_size / ffm->packet_size) * (ffm->packet_size - FFM_HEADER_SIZE) + len;
312 if (size <= avail_size)
313 return 1;
314 else
315 return 0;
316}
317
318/* first is true if we read the frame header */
4606ac8d 319static int ffm_read_data(AVFormatContext *s,
0c1a9eda 320 uint8_t *buf, int size, int first)
de6d9b64
FB
321{
322 FFMContext *ffm = s->priv_data;
323 ByteIOContext *pb = &s->pb;
324 int len, fill_size, size1, frame_offset;
325
326 size1 = size;
327 while (size > 0) {
328 redo:
329 len = ffm->packet_end - ffm->packet_ptr;
330 if (len > size)
331 len = size;
332 if (len == 0) {
333 if (url_ftell(pb) == ffm->file_size)
334 url_fseek(pb, ffm->packet_size, SEEK_SET);
5e57424d 335 retry_read:
de6d9b64
FB
336 get_be16(pb); /* PACKET_ID */
337 fill_size = get_be16(pb);
338 ffm->pts = get_be64(pb);
339 frame_offset = get_be16(pb);
340 get_buffer(pb, ffm->packet, ffm->packet_size - FFM_HEADER_SIZE);
341 ffm->packet_end = ffm->packet + (ffm->packet_size - FFM_HEADER_SIZE - fill_size);
91628427
PG
342 if (ffm->packet_end < ffm->packet)
343 av_abort();
de6d9b64
FB
344 /* if first packet or resynchronization packet, we must
345 handle it specifically */
346 if (ffm->first_packet || (frame_offset & 0x8000)) {
5e57424d
PG
347 if (!frame_offset) {
348 /* This packet has no frame headers in it */
349 if (url_ftell(pb) >= ffm->packet_size * 3) {
350 url_fseek(pb, -ffm->packet_size * 2, SEEK_CUR);
351 goto retry_read;
352 }
353 /* This is bad, we cannot find a valid frame header */
354 return 0;
355 }
de6d9b64 356 ffm->first_packet = 0;
5e57424d 357 if ((frame_offset & 0x7ffff) < FFM_HEADER_SIZE)
789bee12 358 av_abort();
de6d9b64
FB
359 ffm->packet_ptr = ffm->packet + (frame_offset & 0x7fff) - FFM_HEADER_SIZE;
360 if (!first)
361 break;
362 } else {
363 ffm->packet_ptr = ffm->packet;
364 }
365 goto redo;
366 }
367 memcpy(buf, ffm->packet_ptr, len);
368 buf += len;
369 ffm->packet_ptr += len;
370 size -= len;
371 first = 0;
372 }
373 return size1 - size;
374}
375
376
91628427
PG
377static void adjust_write_index(AVFormatContext *s)
378{
379 FFMContext *ffm = s->priv_data;
380 ByteIOContext *pb = &s->pb;
381 int64_t pts;
382 //offset_t orig_write_index = ffm->write_index;
383 offset_t pos_min, pos_max;
384 int64_t pts_start;
385 offset_t ptr = url_ftell(pb);
386
387
388 pos_min = 0;
389 pos_max = ffm->file_size - 2 * FFM_PACKET_SIZE;
390
391 pts_start = get_pts(s, pos_min);
392
393 pts = get_pts(s, pos_max);
394
395 if (pts - 100000 > pts_start)
79292510 396 goto end;
91628427
PG
397
398 ffm->write_index = FFM_PACKET_SIZE;
399
400 pts_start = get_pts(s, pos_min);
401
402 pts = get_pts(s, pos_max);
403
404 if (pts - 100000 <= pts_start) {
405 while (1) {
406 offset_t newpos;
407 int64_t newpts;
408
409 newpos = ((pos_max + pos_min) / (2 * FFM_PACKET_SIZE)) * FFM_PACKET_SIZE;
410
411 if (newpos == pos_min)
412 break;
413
414 newpts = get_pts(s, newpos);
415
416 if (newpts - 100000 <= pts) {
417 pos_max = newpos;
418 pts = newpts;
419 } else {
420 pos_min = newpos;
421 }
422 }
423 ffm->write_index += pos_max;
424 }
425
426 //printf("Adjusted write index from %lld to %lld: pts=%0.6f\n", orig_write_index, ffm->write_index, pts / 1000000.);
427 //printf("pts range %0.6f - %0.6f\n", get_pts(s, 0) / 1000000. , get_pts(s, ffm->file_size - 2 * FFM_PACKET_SIZE) / 1000000. );
428
79292510 429 end:
91628427
PG
430 url_fseek(pb, ptr, SEEK_SET);
431}
432
433
de6d9b64
FB
434static int ffm_read_header(AVFormatContext *s, AVFormatParameters *ap)
435{
c9a65ca8 436 FFMContext *ffm = s->priv_data;
de6d9b64
FB
437 AVStream *st;
438 FFMStream *fst;
de6d9b64
FB
439 ByteIOContext *pb = &s->pb;
440 AVCodecContext *codec;
fa26a29d 441 int i, nb_streams;
0c1a9eda 442 uint32_t tag;
de6d9b64 443
de6d9b64
FB
444 /* header */
445 tag = get_le32(pb);
446 if (tag != MKTAG('F', 'F', 'M', '1'))
447 goto fail;
448 ffm->packet_size = get_be32(pb);
449 if (ffm->packet_size != FFM_PACKET_SIZE)
450 goto fail;
451 ffm->write_index = get_be64(pb);
452 /* get also filesize */
453 if (!url_is_streamed(pb)) {
454 ffm->file_size = url_filesize(url_fileno(pb));
91628427 455 adjust_write_index(s);
de6d9b64 456 } else {
0c1a9eda 457 ffm->file_size = (uint64_t_C(1) << 63) - 1;
de6d9b64
FB
458 }
459
fa26a29d 460 nb_streams = get_be32(pb);
de6d9b64
FB
461 get_be32(pb); /* total bitrate */
462 /* read each stream */
fa26a29d 463 for(i=0;i<nb_streams;i++) {
75bdb984
PG
464 char rc_eq_buf[128];
465
fa26a29d 466 st = av_new_stream(s, 0);
de6d9b64
FB
467 if (!st)
468 goto fail;
16300e23 469 fst = av_mallocz(sizeof(FFMStream));
de6d9b64
FB
470 if (!fst)
471 goto fail;
e928649b
MN
472
473 av_set_pts_info(st, 64, 1, 1000000);
474
de6d9b64
FB
475 st->priv_data = fst;
476
477 codec = &st->codec;
478 /* generic info */
479 st->codec.codec_id = get_be32(pb);
480 st->codec.codec_type = get_byte(pb); /* codec_type */
481 codec->bit_rate = get_be32(pb);
1e491e29 482 st->quality = get_be32(pb);
ccac2e27 483 codec->flags = get_be32(pb);
de6d9b64
FB
484 /* specific info */
485 switch(codec->codec_type) {
486 case CODEC_TYPE_VIDEO:
14bea432
MN
487 codec->frame_rate_base = get_be32(pb);
488 codec->frame_rate = get_be32(pb);
de6d9b64
FB
489 codec->width = get_be16(pb);
490 codec->height = get_be16(pb);
20f01548
PG
491 codec->gop_size = get_be16(pb);
492 codec->qmin = get_byte(pb);
493 codec->qmax = get_byte(pb);
494 codec->max_qdiff = get_byte(pb);
495 codec->qcompress = get_be16(pb) / 10000.0;
496 codec->qblur = get_be16(pb) / 10000.0;
3884a3c3 497 codec->bit_rate_tolerance = get_be32(pb);
e9a9e0c2 498 codec->rc_eq = av_strdup(get_strz(pb, rc_eq_buf, sizeof(rc_eq_buf)));
75bdb984
PG
499 codec->rc_max_rate = get_be32(pb);
500 codec->rc_min_rate = get_be32(pb);
501 codec->rc_buffer_size = get_be32(pb);
3b4b29dc
FB
502 codec->i_quant_factor = get_be64_double(pb);
503 codec->b_quant_factor = get_be64_double(pb);
504 codec->i_quant_offset = get_be64_double(pb);
505 codec->b_quant_offset = get_be64_double(pb);
75bdb984 506 codec->dct_algo = get_be32(pb);
de6d9b64
FB
507 break;
508 case CODEC_TYPE_AUDIO:
509 codec->sample_rate = get_be32(pb);
510 codec->channels = get_le16(pb);
20f01548 511 codec->frame_size = get_le16(pb);
de6d9b64 512 break;
20f01548 513 default:
75bdb984 514 goto fail;
de6d9b64
FB
515 }
516
517 }
518
519 /* get until end of block reached */
520 while ((url_ftell(pb) % ffm->packet_size) != 0)
521 get_byte(pb);
522
523 /* init packet demux */
524 ffm->packet_ptr = ffm->packet;
525 ffm->packet_end = ffm->packet;
526 ffm->frame_offset = 0;
527 ffm->pts = 0;
528 ffm->read_state = READ_HEADER;
529 ffm->first_packet = 1;
530 return 0;
531 fail:
532 for(i=0;i<s->nb_streams;i++) {
533 st = s->streams[i];
534 if (st) {
789bee12 535 av_freep(&st->priv_data);
1ea4f593 536 av_free(st);
de6d9b64
FB
537 }
538 }
de6d9b64
FB
539 return -1;
540}
541
542/* return < 0 if eof */
543static int ffm_read_packet(AVFormatContext *s, AVPacket *pkt)
544{
545 int size;
546 FFMContext *ffm = s->priv_data;
20f01548 547 int duration;
de6d9b64
FB
548
549 switch(ffm->read_state) {
550 case READ_HEADER:
66d2ff2a 551 if (!ffm_is_avail_data(s, FRAME_HEADER_SIZE)) {
de6d9b64 552 return -EAGAIN;
66d2ff2a 553 }
de6d9b64 554#if 0
4606ac8d 555 printf("pos=%08Lx spos=%Lx, write_index=%Lx size=%Lx\n",
de6d9b64
FB
556 url_ftell(&s->pb), s->pb.pos, ffm->write_index, ffm->file_size);
557#endif
66d2ff2a
FB
558 if (ffm_read_data(s, ffm->header, FRAME_HEADER_SIZE, 1) !=
559 FRAME_HEADER_SIZE)
de6d9b64 560 return -EAGAIN;
de6d9b64
FB
561#if 0
562 {
563 int i;
564 for(i=0;i<FRAME_HEADER_SIZE;i++)
565 printf("%02x ", ffm->header[i]);
566 printf("\n");
567 }
568#endif
569 ffm->read_state = READ_DATA;
570 /* fall thru */
571 case READ_DATA:
572 size = (ffm->header[2] << 16) | (ffm->header[3] << 8) | ffm->header[4];
573 if (!ffm_is_avail_data(s, size)) {
574 return -EAGAIN;
575 }
576
20f01548
PG
577 duration = (ffm->header[5] << 16) | (ffm->header[6] << 8) | ffm->header[7];
578
de6d9b64
FB
579 av_new_packet(pkt, size);
580 pkt->stream_index = ffm->header[0];
581 if (ffm->header[1] & FLAG_KEY_FRAME)
582 pkt->flags |= PKT_FLAG_KEY;
4606ac8d 583
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584 ffm->read_state = READ_HEADER;
585 if (ffm_read_data(s, pkt->data, size, 0) != size) {
586 /* bad case: desynchronized packet. we cancel all the packet loading */
587 av_free_packet(pkt);
588 return -EAGAIN;
589 }
20f01548
PG
590 pkt->pts = ffm->pts;
591 pkt->duration = duration;
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592 break;
593 }
594 return 0;
595}
596
597//#define DEBUG_SEEK
598
599/* pos is between 0 and file_size - FFM_PACKET_SIZE. It is translated
600 by the write position inside this function */
601static void ffm_seek1(AVFormatContext *s, offset_t pos1)
602{
603 FFMContext *ffm = s->priv_data;
604 ByteIOContext *pb = &s->pb;
605 offset_t pos;
606
607 pos = pos1 + ffm->write_index;
608 if (pos >= ffm->file_size)
609 pos -= (ffm->file_size - FFM_PACKET_SIZE);
610#ifdef DEBUG_SEEK
611 printf("seek to %Lx -> %Lx\n", pos1, pos);
612#endif
613 url_fseek(pb, pos, SEEK_SET);
614}
615
0c1a9eda 616static int64_t get_pts(AVFormatContext *s, offset_t pos)
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617{
618 ByteIOContext *pb = &s->pb;
0c1a9eda 619 int64_t pts;
de6d9b64 620
4606ac8d 621 ffm_seek1(s, pos);
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622 url_fskip(pb, 4);
623 pts = get_be64(pb);
624#ifdef DEBUG_SEEK
625 printf("pts=%0.6f\n", pts / 1000000.0);
626#endif
627 return pts;
628}
629
630/* seek to a given time in the file. The file read pointer is
631 positionned at or before pts. XXX: the following code is quite
632 approximative */
0c1a9eda 633static int ffm_seek(AVFormatContext *s, int64_t wanted_pts)
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634{
635 FFMContext *ffm = s->priv_data;
636 offset_t pos_min, pos_max, pos;
0c1a9eda 637 int64_t pts_min, pts_max, pts;
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638 double pos1;
639
640#ifdef DEBUG_SEEK
641 printf("wanted_pts=%0.6f\n", wanted_pts / 1000000.0);
642#endif
643 /* find the position using linear interpolation (better than
644 dichotomy in typical cases) */
645 pos_min = 0;
646 pos_max = ffm->file_size - 2 * FFM_PACKET_SIZE;
647 while (pos_min <= pos_max) {
648 pts_min = get_pts(s, pos_min);
649 pts_max = get_pts(s, pos_max);
650 /* linear interpolation */
4606ac8d 651 pos1 = (double)(pos_max - pos_min) * (double)(wanted_pts - pts_min) /
de6d9b64 652 (double)(pts_max - pts_min);
0c1a9eda 653 pos = (((int64_t)pos1) / FFM_PACKET_SIZE) * FFM_PACKET_SIZE;
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654 if (pos <= pos_min)
655 pos = pos_min;
656 else if (pos >= pos_max)
657 pos = pos_max;
658 pts = get_pts(s, pos);
659 /* check if we are lucky */
660 if (pts == wanted_pts) {
661 goto found;
662 } else if (pts > wanted_pts) {
663 pos_max = pos - FFM_PACKET_SIZE;
664 } else {
665 pos_min = pos + FFM_PACKET_SIZE;
666 }
667 }
668 pos = pos_min;
669 if (pos > 0)
670 pos -= FFM_PACKET_SIZE;
671 found:
672 ffm_seek1(s, pos);
673 return 0;
674}
675
676offset_t ffm_read_write_index(int fd)
677{
0c1a9eda 678 uint8_t buf[8];
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679 offset_t pos;
680 int i;
681
682 lseek(fd, 8, SEEK_SET);
683 read(fd, buf, 8);
684 pos = 0;
4606ac8d 685 for(i=0;i<8;i++)
fa26a29d 686 pos |= (int64_t)buf[i] << (56 - i * 8);
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687 return pos;
688}
689
690void ffm_write_write_index(int fd, offset_t pos)
691{
0c1a9eda 692 uint8_t buf[8];
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693 int i;
694
4606ac8d 695 for(i=0;i<8;i++)
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696 buf[i] = (pos >> (56 - i * 8)) & 0xff;
697 lseek(fd, 8, SEEK_SET);
698 write(fd, buf, 8);
699}
700
701void ffm_set_write_index(AVFormatContext *s, offset_t pos, offset_t file_size)
702{
703 FFMContext *ffm = s->priv_data;
704 ffm->write_index = pos;
705 ffm->file_size = file_size;
706}
707
708static int ffm_read_close(AVFormatContext *s)
709{
710 AVStream *st;
711 int i;
712
713 for(i=0;i<s->nb_streams;i++) {
714 st = s->streams[i];
789bee12 715 av_freep(&st->priv_data);
de6d9b64 716 }
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717 return 0;
718}
719
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720static int ffm_probe(AVProbeData *p)
721{
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722 if (p->buf_size >= 4 &&
723 p->buf[0] == 'F' && p->buf[1] == 'F' && p->buf[2] == 'M' &&
724 p->buf[3] == '1')
07c4ed85 725 return AVPROBE_SCORE_MAX + 1;
07c4ed85
PG
726 return 0;
727}
728
c18a2692 729static AVInputFormat ffm_iformat = {
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730 "ffm",
731 "ffm format",
66d2ff2a 732 sizeof(FFMContext),
07c4ed85 733 ffm_probe,
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734 ffm_read_header,
735 ffm_read_packet,
736 ffm_read_close,
737 ffm_seek,
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738};
739
764ef400 740#ifdef CONFIG_ENCODERS
c18a2692 741static AVOutputFormat ffm_oformat = {
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742 "ffm",
743 "ffm format",
744 "",
745 "ffm",
66d2ff2a 746 sizeof(FFMContext),
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747 /* not really used */
748 CODEC_ID_MP2,
749 CODEC_ID_MPEG1VIDEO,
750 ffm_write_header,
751 ffm_write_packet,
752 ffm_write_trailer,
de6d9b64 753};
764ef400 754#endif //CONFIG_ENCODERS
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755
756int ffm_init(void)
757{
758 av_register_input_format(&ffm_iformat);
764ef400 759#ifdef CONFIG_ENCODERS
c9a65ca8 760 av_register_output_format(&ffm_oformat);
764ef400 761#endif //CONFIG_ENCODERS
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762 return 0;
763}