Precompute a chroma_qp table with index offset for each pps,
[libav.git] / libavformat / ffm.c
CommitLineData
de6d9b64 1/*
7fbde343 2 * FFM (ffserver live feed) muxer and demuxer
66d2ff2a 3 * Copyright (c) 2001 Fabrice Bellard.
de6d9b64 4 *
b78e7197
DB
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
66d2ff2a
FB
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
b78e7197 10 * version 2.1 of the License, or (at your option) any later version.
de6d9b64 11 *
b78e7197 12 * FFmpeg is distributed in the hope that it will be useful,
de6d9b64 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
66d2ff2a
FB
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
de6d9b64 16 *
66d2ff2a 17 * You should have received a copy of the GNU Lesser General Public
b78e7197 18 * License along with FFmpeg; if not, write to the Free Software
5509bffa 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
de6d9b64 20 */
de6d9b64 21#include "avformat.h"
8be1c656 22#include <unistd.h>
de6d9b64
FB
23
24/* The FFM file is made of blocks of fixed size */
25#define FFM_HEADER_SIZE 14
26#define PACKET_ID 0x666d
27
28/* each packet contains frames (which can span several packets */
20f01548 29#define FRAME_HEADER_SIZE 8
de6d9b64
FB
30#define FLAG_KEY_FRAME 0x01
31
32typedef struct FFMStream {
0c1a9eda 33 int64_t pts;
de6d9b64
FB
34} FFMStream;
35
36enum {
37 READ_HEADER,
38 READ_DATA,
39};
40
41typedef struct FFMContext {
42 /* only reading mode */
43 offset_t write_index, file_size;
4606ac8d 44 int read_state;
0c1a9eda 45 uint8_t header[FRAME_HEADER_SIZE];
de6d9b64
FB
46
47 /* read and write */
48 int first_packet; /* true if first packet, needed to set the discontinuity tag */
d271481f 49 int first_frame_in_packet; /* true if first frame in packet, needed to know if PTS information is valid */
de6d9b64
FB
50 int packet_size;
51 int frame_offset;
0c1a9eda
ZK
52 int64_t pts;
53 uint8_t *packet_ptr, *packet_end;
54 uint8_t packet[FFM_PACKET_SIZE];
de6d9b64
FB
55} FFMContext;
56
91628427
PG
57static int64_t get_pts(AVFormatContext *s, offset_t pos);
58
c9a65ca8
FB
59/* disable pts hack for testing */
60int ffm_nopts = 0;
61
a9e35095 62#ifdef CONFIG_MUXERS
de6d9b64
FB
63static void flush_packet(AVFormatContext *s)
64{
65 FFMContext *ffm = s->priv_data;
66 int fill_size, h;
67 ByteIOContext *pb = &s->pb;
68
69 fill_size = ffm->packet_end - ffm->packet_ptr;
70 memset(ffm->packet_ptr, 0, fill_size);
4606ac8d 71
115329f1 72 if (url_ftell(pb) % ffm->packet_size)
91628427
PG
73 av_abort();
74
de6d9b64 75 /* put header */
4606ac8d 76 put_be16(pb, PACKET_ID);
de6d9b64
FB
77 put_be16(pb, fill_size);
78 put_be64(pb, ffm->pts);
79 h = ffm->frame_offset;
80 if (ffm->first_packet)
81 h |= 0x8000;
82 put_be16(pb, h);
83 put_buffer(pb, ffm->packet, ffm->packet_end - ffm->packet);
34f633df 84 put_flush_packet(pb);
de6d9b64
FB
85
86 /* prepare next packet */
87 ffm->frame_offset = 0; /* no key frame */
88 ffm->pts = 0; /* no pts */
89 ffm->packet_ptr = ffm->packet;
90 ffm->first_packet = 0;
91}
92
93/* 'first' is true if first data of a frame */
4606ac8d 94static void ffm_write_data(AVFormatContext *s,
49057904 95 const uint8_t *buf, int size,
0c1a9eda 96 int64_t pts, int first)
de6d9b64
FB
97{
98 FFMContext *ffm = s->priv_data;
99 int len;
100
101 if (first && ffm->frame_offset == 0)
102 ffm->frame_offset = ffm->packet_ptr - ffm->packet + FFM_HEADER_SIZE;
103 if (first && ffm->pts == 0)
104 ffm->pts = pts;
105
106 /* write as many packets as needed */
107 while (size > 0) {
108 len = ffm->packet_end - ffm->packet_ptr;
109 if (len > size)
110 len = size;
111 memcpy(ffm->packet_ptr, buf, len);
4606ac8d 112
de6d9b64
FB
113 ffm->packet_ptr += len;
114 buf += len;
115 size -= len;
116 if (ffm->packet_ptr >= ffm->packet_end) {
117 /* special case : no pts in packet : we leave the current one */
118 if (ffm->pts == 0)
119 ffm->pts = pts;
120
121 flush_packet(s);
122 }
123 }
124}
125
126static int ffm_write_header(AVFormatContext *s)
127{
c9a65ca8 128 FFMContext *ffm = s->priv_data;
de6d9b64
FB
129 AVStream *st;
130 FFMStream *fst;
de6d9b64
FB
131 ByteIOContext *pb = &s->pb;
132 AVCodecContext *codec;
133 int bit_rate, i;
134
de6d9b64 135 ffm->packet_size = FFM_PACKET_SIZE;
4606ac8d 136
de6d9b64 137 /* header */
26aa0f89 138 put_le32(pb, MKTAG('F', 'F', 'M', '1'));
de6d9b64
FB
139 put_be32(pb, ffm->packet_size);
140 /* XXX: store write position in other file ? */
141 put_be64(pb, ffm->packet_size); /* current write position */
142
143 put_be32(pb, s->nb_streams);
144 bit_rate = 0;
145 for(i=0;i<s->nb_streams;i++) {
146 st = s->streams[i];
01f4895c 147 bit_rate += st->codec->bit_rate;
de6d9b64
FB
148 }
149 put_be32(pb, bit_rate);
150
151 /* list of streams */
152 for(i=0;i<s->nb_streams;i++) {
153 st = s->streams[i];
16300e23 154 fst = av_mallocz(sizeof(FFMStream));
de6d9b64
FB
155 if (!fst)
156 goto fail;
53e2f9ca 157 av_set_pts_info(st, 64, 1, 1000000);
de6d9b64
FB
158 st->priv_data = fst;
159
01f4895c 160 codec = st->codec;
de6d9b64
FB
161 /* generic info */
162 put_be32(pb, codec->codec_id);
163 put_byte(pb, codec->codec_type);
164 put_be32(pb, codec->bit_rate);
bb270c08 165 put_be32(pb, st->quality);
ccac2e27 166 put_be32(pb, codec->flags);
22332126
PG
167 put_be32(pb, codec->flags2);
168 put_be32(pb, codec->debug);
de6d9b64
FB
169 /* specific info */
170 switch(codec->codec_type) {
171 case CODEC_TYPE_VIDEO:
c0df9d75
MN
172 put_be32(pb, codec->time_base.num);
173 put_be32(pb, codec->time_base.den);
de6d9b64
FB
174 put_be16(pb, codec->width);
175 put_be16(pb, codec->height);
20f01548 176 put_be16(pb, codec->gop_size);
22332126 177 put_be32(pb, codec->pix_fmt);
20f01548
PG
178 put_byte(pb, codec->qmin);
179 put_byte(pb, codec->qmax);
180 put_byte(pb, codec->max_qdiff);
181 put_be16(pb, (int) (codec->qcompress * 10000.0));
182 put_be16(pb, (int) (codec->qblur * 10000.0));
3884a3c3 183 put_be32(pb, codec->bit_rate_tolerance);
3b4b29dc 184 put_strz(pb, codec->rc_eq);
75bdb984
PG
185 put_be32(pb, codec->rc_max_rate);
186 put_be32(pb, codec->rc_min_rate);
187 put_be32(pb, codec->rc_buffer_size);
7cb8f314
MN
188 put_be64(pb, av_dbl2int(codec->i_quant_factor));
189 put_be64(pb, av_dbl2int(codec->b_quant_factor));
190 put_be64(pb, av_dbl2int(codec->i_quant_offset));
191 put_be64(pb, av_dbl2int(codec->b_quant_offset));
75bdb984 192 put_be32(pb, codec->dct_algo);
22332126
PG
193 put_be32(pb, codec->strict_std_compliance);
194 put_be32(pb, codec->max_b_frames);
195 put_be32(pb, codec->luma_elim_threshold);
196 put_be32(pb, codec->chroma_elim_threshold);
197 put_be32(pb, codec->mpeg_quant);
198 put_be32(pb, codec->intra_dc_precision);
199 put_be32(pb, codec->me_method);
200 put_be32(pb, codec->mb_decision);
201 put_be32(pb, codec->nsse_weight);
202 put_be32(pb, codec->frame_skip_cmp);
7cb8f314 203 put_be64(pb, av_dbl2int(codec->rc_buffer_aggressivity));
038a1243 204 put_be32(pb, codec->codec_tag);
de6d9b64
FB
205 break;
206 case CODEC_TYPE_AUDIO:
207 put_be32(pb, codec->sample_rate);
208 put_le16(pb, codec->channels);
20f01548 209 put_le16(pb, codec->frame_size);
de6d9b64 210 break;
20f01548 211 default:
71c32f19 212 return -1;
de6d9b64
FB
213 }
214 /* hack to have real time */
c9a65ca8
FB
215 if (ffm_nopts)
216 fst->pts = 0;
217 else
a11bf0bd 218 fst->pts = av_gettime();
de6d9b64
FB
219 }
220
221 /* flush until end of block reached */
222 while ((url_ftell(pb) % ffm->packet_size) != 0)
223 put_byte(pb, 0);
224
225 put_flush_packet(pb);
226
227 /* init packet mux */
228 ffm->packet_ptr = ffm->packet;
229 ffm->packet_end = ffm->packet + ffm->packet_size - FFM_HEADER_SIZE;
71c32f19 230 assert(ffm->packet_end >= ffm->packet);
de6d9b64
FB
231 ffm->frame_offset = 0;
232 ffm->pts = 0;
233 ffm->first_packet = 1;
234
235 return 0;
236 fail:
237 for(i=0;i<s->nb_streams;i++) {
238 st = s->streams[i];
789bee12 239 av_freep(&st->priv_data);
de6d9b64 240 }
de6d9b64
FB
241 return -1;
242}
243
e928649b 244static int ffm_write_packet(AVFormatContext *s, AVPacket *pkt)
de6d9b64 245{
e928649b 246 AVStream *st = s->streams[pkt->stream_index];
de6d9b64 247 FFMStream *fst = st->priv_data;
0c1a9eda
ZK
248 int64_t pts;
249 uint8_t header[FRAME_HEADER_SIZE];
20f01548 250 int duration;
e928649b 251 int size= pkt->size;
20f01548 252
e928649b 253 //XXX/FIXME use duration from pkt
01f4895c
MN
254 if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
255 duration = ((float)st->codec->frame_size / st->codec->sample_rate * 1000000.0);
20f01548 256 } else {
01f4895c 257 duration = (1000000.0 * st->codec->time_base.num / (float)st->codec->time_base.den);
20f01548 258 }
de6d9b64
FB
259
260 pts = fst->pts;
261 /* packet size & key_frame */
e928649b 262 header[0] = pkt->stream_index;
de6d9b64 263 header[1] = 0;
e928649b 264 if (pkt->flags & PKT_FLAG_KEY)
de6d9b64
FB
265 header[1] |= FLAG_KEY_FRAME;
266 header[2] = (size >> 16) & 0xff;
267 header[3] = (size >> 8) & 0xff;
268 header[4] = size & 0xff;
20f01548
PG
269 header[5] = (duration >> 16) & 0xff;
270 header[6] = (duration >> 8) & 0xff;
271 header[7] = duration & 0xff;
de6d9b64 272 ffm_write_data(s, header, FRAME_HEADER_SIZE, pts, 1);
e928649b 273 ffm_write_data(s, pkt->data, size, pts, 0);
de6d9b64 274
20f01548 275 fst->pts += duration;
de6d9b64
FB
276 return 0;
277}
278
279static int ffm_write_trailer(AVFormatContext *s)
280{
281 ByteIOContext *pb = &s->pb;
282 FFMContext *ffm = s->priv_data;
de6d9b64
FB
283
284 /* flush packets */
285 if (ffm->packet_ptr > ffm->packet)
286 flush_packet(s);
287
288 put_flush_packet(pb);
289
66d2ff2a 290 if (!url_is_streamed(pb)) {
0c1a9eda 291 int64_t size;
66d2ff2a
FB
292 /* update the write offset */
293 size = url_ftell(pb);
294 url_fseek(pb, 8, SEEK_SET);
295 put_be64(pb, size);
296 put_flush_packet(pb);
297 }
298
de6d9b64
FB
299 return 0;
300}
a9e35095 301#endif //CONFIG_MUXERS
de6d9b64
FB
302
303/* ffm demux */
304
305static int ffm_is_avail_data(AVFormatContext *s, int size)
306{
307 FFMContext *ffm = s->priv_data;
308 offset_t pos, avail_size;
309 int len;
310
311 len = ffm->packet_end - ffm->packet_ptr;
66d2ff2a
FB
312 if (!ffm_nopts) {
313 /* XXX: I don't understand this test, so I disabled it for testing */
314 if (size <= len)
315 return 1;
316 }
de6d9b64
FB
317 pos = url_ftell(&s->pb);
318 if (pos == ffm->write_index) {
319 /* exactly at the end of stream */
320 return 0;
321 } else if (pos < ffm->write_index) {
322 avail_size = ffm->write_index - pos;
323 } else {
324 avail_size = (ffm->file_size - pos) + (ffm->write_index - FFM_PACKET_SIZE);
325 }
326 avail_size = (avail_size / ffm->packet_size) * (ffm->packet_size - FFM_HEADER_SIZE) + len;
327 if (size <= avail_size)
328 return 1;
329 else
330 return 0;
331}
332
333/* first is true if we read the frame header */
4606ac8d 334static int ffm_read_data(AVFormatContext *s,
0c1a9eda 335 uint8_t *buf, int size, int first)
de6d9b64
FB
336{
337 FFMContext *ffm = s->priv_data;
338 ByteIOContext *pb = &s->pb;
339 int len, fill_size, size1, frame_offset;
340
341 size1 = size;
342 while (size > 0) {
343 redo:
344 len = ffm->packet_end - ffm->packet_ptr;
345 if (len > size)
346 len = size;
347 if (len == 0) {
348 if (url_ftell(pb) == ffm->file_size)
349 url_fseek(pb, ffm->packet_size, SEEK_SET);
5e57424d 350 retry_read:
de6d9b64
FB
351 get_be16(pb); /* PACKET_ID */
352 fill_size = get_be16(pb);
353 ffm->pts = get_be64(pb);
d271481f 354 ffm->first_frame_in_packet = 1;
de6d9b64
FB
355 frame_offset = get_be16(pb);
356 get_buffer(pb, ffm->packet, ffm->packet_size - FFM_HEADER_SIZE);
357 ffm->packet_end = ffm->packet + (ffm->packet_size - FFM_HEADER_SIZE - fill_size);
91628427 358 if (ffm->packet_end < ffm->packet)
71c32f19 359 return -1;
de6d9b64
FB
360 /* if first packet or resynchronization packet, we must
361 handle it specifically */
362 if (ffm->first_packet || (frame_offset & 0x8000)) {
5e57424d
PG
363 if (!frame_offset) {
364 /* This packet has no frame headers in it */
365 if (url_ftell(pb) >= ffm->packet_size * 3) {
366 url_fseek(pb, -ffm->packet_size * 2, SEEK_CUR);
367 goto retry_read;
368 }
369 /* This is bad, we cannot find a valid frame header */
370 return 0;
371 }
de6d9b64 372 ffm->first_packet = 0;
5e57424d 373 if ((frame_offset & 0x7ffff) < FFM_HEADER_SIZE)
71c32f19 374 return -1;
de6d9b64
FB
375 ffm->packet_ptr = ffm->packet + (frame_offset & 0x7fff) - FFM_HEADER_SIZE;
376 if (!first)
377 break;
378 } else {
379 ffm->packet_ptr = ffm->packet;
380 }
381 goto redo;
382 }
383 memcpy(buf, ffm->packet_ptr, len);
384 buf += len;
385 ffm->packet_ptr += len;
386 size -= len;
387 first = 0;
388 }
389 return size1 - size;
390}
391
392
91628427
PG
393static void adjust_write_index(AVFormatContext *s)
394{
395 FFMContext *ffm = s->priv_data;
396 ByteIOContext *pb = &s->pb;
397 int64_t pts;
398 //offset_t orig_write_index = ffm->write_index;
399 offset_t pos_min, pos_max;
400 int64_t pts_start;
401 offset_t ptr = url_ftell(pb);
402
403
404 pos_min = 0;
405 pos_max = ffm->file_size - 2 * FFM_PACKET_SIZE;
406
407 pts_start = get_pts(s, pos_min);
408
409 pts = get_pts(s, pos_max);
410
115329f1 411 if (pts - 100000 > pts_start)
79292510 412 goto end;
91628427
PG
413
414 ffm->write_index = FFM_PACKET_SIZE;
415
416 pts_start = get_pts(s, pos_min);
417
418 pts = get_pts(s, pos_max);
419
420 if (pts - 100000 <= pts_start) {
421 while (1) {
422 offset_t newpos;
423 int64_t newpts;
424
425 newpos = ((pos_max + pos_min) / (2 * FFM_PACKET_SIZE)) * FFM_PACKET_SIZE;
426
427 if (newpos == pos_min)
428 break;
429
430 newpts = get_pts(s, newpos);
431
432 if (newpts - 100000 <= pts) {
433 pos_max = newpos;
434 pts = newpts;
435 } else {
436 pos_min = newpos;
437 }
438 }
439 ffm->write_index += pos_max;
440 }
441
949b1a13 442 //printf("Adjusted write index from %"PRId64" to %"PRId64": pts=%0.6f\n", orig_write_index, ffm->write_index, pts / 1000000.);
91628427
PG
443 //printf("pts range %0.6f - %0.6f\n", get_pts(s, 0) / 1000000. , get_pts(s, ffm->file_size - 2 * FFM_PACKET_SIZE) / 1000000. );
444
79292510 445 end:
91628427
PG
446 url_fseek(pb, ptr, SEEK_SET);
447}
448
449
de6d9b64
FB
450static int ffm_read_header(AVFormatContext *s, AVFormatParameters *ap)
451{
c9a65ca8 452 FFMContext *ffm = s->priv_data;
de6d9b64
FB
453 AVStream *st;
454 FFMStream *fst;
de6d9b64
FB
455 ByteIOContext *pb = &s->pb;
456 AVCodecContext *codec;
fa26a29d 457 int i, nb_streams;
0c1a9eda 458 uint32_t tag;
de6d9b64 459
de6d9b64
FB
460 /* header */
461 tag = get_le32(pb);
462 if (tag != MKTAG('F', 'F', 'M', '1'))
463 goto fail;
464 ffm->packet_size = get_be32(pb);
465 if (ffm->packet_size != FFM_PACKET_SIZE)
466 goto fail;
467 ffm->write_index = get_be64(pb);
468 /* get also filesize */
469 if (!url_is_streamed(pb)) {
a965c478 470 ffm->file_size = url_fsize(pb);
91628427 471 adjust_write_index(s);
de6d9b64 472 } else {
8da9266c 473 ffm->file_size = (UINT64_C(1) << 63) - 1;
de6d9b64
FB
474 }
475
fa26a29d 476 nb_streams = get_be32(pb);
de6d9b64
FB
477 get_be32(pb); /* total bitrate */
478 /* read each stream */
fa26a29d 479 for(i=0;i<nb_streams;i++) {
75bdb984
PG
480 char rc_eq_buf[128];
481
fa26a29d 482 st = av_new_stream(s, 0);
de6d9b64
FB
483 if (!st)
484 goto fail;
16300e23 485 fst = av_mallocz(sizeof(FFMStream));
de6d9b64
FB
486 if (!fst)
487 goto fail;
26aa0f89 488 s->streams[i] = st;
115329f1 489
e928649b 490 av_set_pts_info(st, 64, 1, 1000000);
115329f1 491
de6d9b64
FB
492 st->priv_data = fst;
493
01f4895c 494 codec = st->codec;
de6d9b64 495 /* generic info */
26aa0f89
AB
496 codec->codec_id = get_be32(pb);
497 codec->codec_type = get_byte(pb); /* codec_type */
de6d9b64 498 codec->bit_rate = get_be32(pb);
26aa0f89 499 st->quality = get_be32(pb);
ccac2e27 500 codec->flags = get_be32(pb);
22332126
PG
501 codec->flags2 = get_be32(pb);
502 codec->debug = get_be32(pb);
de6d9b64
FB
503 /* specific info */
504 switch(codec->codec_type) {
505 case CODEC_TYPE_VIDEO:
c0df9d75
MN
506 codec->time_base.num = get_be32(pb);
507 codec->time_base.den = get_be32(pb);
de6d9b64
FB
508 codec->width = get_be16(pb);
509 codec->height = get_be16(pb);
20f01548 510 codec->gop_size = get_be16(pb);
22332126 511 codec->pix_fmt = get_be32(pb);
20f01548
PG
512 codec->qmin = get_byte(pb);
513 codec->qmax = get_byte(pb);
514 codec->max_qdiff = get_byte(pb);
515 codec->qcompress = get_be16(pb) / 10000.0;
516 codec->qblur = get_be16(pb) / 10000.0;
3884a3c3 517 codec->bit_rate_tolerance = get_be32(pb);
e9a9e0c2 518 codec->rc_eq = av_strdup(get_strz(pb, rc_eq_buf, sizeof(rc_eq_buf)));
75bdb984
PG
519 codec->rc_max_rate = get_be32(pb);
520 codec->rc_min_rate = get_be32(pb);
521 codec->rc_buffer_size = get_be32(pb);
7cb8f314
MN
522 codec->i_quant_factor = av_int2dbl(get_be64(pb));
523 codec->b_quant_factor = av_int2dbl(get_be64(pb));
524 codec->i_quant_offset = av_int2dbl(get_be64(pb));
525 codec->b_quant_offset = av_int2dbl(get_be64(pb));
75bdb984 526 codec->dct_algo = get_be32(pb);
22332126
PG
527 codec->strict_std_compliance = get_be32(pb);
528 codec->max_b_frames = get_be32(pb);
529 codec->luma_elim_threshold = get_be32(pb);
530 codec->chroma_elim_threshold = get_be32(pb);
531 codec->mpeg_quant = get_be32(pb);
532 codec->intra_dc_precision = get_be32(pb);
533 codec->me_method = get_be32(pb);
534 codec->mb_decision = get_be32(pb);
535 codec->nsse_weight = get_be32(pb);
536 codec->frame_skip_cmp = get_be32(pb);
7cb8f314 537 codec->rc_buffer_aggressivity = av_int2dbl(get_be64(pb));
038a1243 538 codec->codec_tag = get_be32(pb);
de6d9b64
FB
539 break;
540 case CODEC_TYPE_AUDIO:
541 codec->sample_rate = get_be32(pb);
542 codec->channels = get_le16(pb);
20f01548 543 codec->frame_size = get_le16(pb);
de6d9b64 544 break;
20f01548 545 default:
75bdb984 546 goto fail;
de6d9b64
FB
547 }
548
549 }
550
551 /* get until end of block reached */
552 while ((url_ftell(pb) % ffm->packet_size) != 0)
553 get_byte(pb);
554
555 /* init packet demux */
556 ffm->packet_ptr = ffm->packet;
557 ffm->packet_end = ffm->packet;
558 ffm->frame_offset = 0;
559 ffm->pts = 0;
560 ffm->read_state = READ_HEADER;
561 ffm->first_packet = 1;
562 return 0;
563 fail:
564 for(i=0;i<s->nb_streams;i++) {
565 st = s->streams[i];
566 if (st) {
789bee12 567 av_freep(&st->priv_data);
1ea4f593 568 av_free(st);
de6d9b64
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569 }
570 }
de6d9b64
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571 return -1;
572}
573
574/* return < 0 if eof */
575static int ffm_read_packet(AVFormatContext *s, AVPacket *pkt)
576{
577 int size;
578 FFMContext *ffm = s->priv_data;
20f01548 579 int duration;
de6d9b64
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580
581 switch(ffm->read_state) {
582 case READ_HEADER:
66d2ff2a 583 if (!ffm_is_avail_data(s, FRAME_HEADER_SIZE)) {
8fa36ae0 584 return AVERROR(EAGAIN);
66d2ff2a 585 }
de6d9b64 586#if 0
949b1a13 587 printf("pos=%08"PRIx64" spos=%"PRIx64", write_index=%"PRIx64" size=%"PRIx64"\n",
de6d9b64
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588 url_ftell(&s->pb), s->pb.pos, ffm->write_index, ffm->file_size);
589#endif
115329f1 590 if (ffm_read_data(s, ffm->header, FRAME_HEADER_SIZE, 1) !=
66d2ff2a 591 FRAME_HEADER_SIZE)
8fa36ae0 592 return AVERROR(EAGAIN);
de6d9b64
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593#if 0
594 {
595 int i;
596 for(i=0;i<FRAME_HEADER_SIZE;i++)
597 printf("%02x ", ffm->header[i]);
598 printf("\n");
599 }
600#endif
601 ffm->read_state = READ_DATA;
602 /* fall thru */
603 case READ_DATA:
604 size = (ffm->header[2] << 16) | (ffm->header[3] << 8) | ffm->header[4];
605 if (!ffm_is_avail_data(s, size)) {
8fa36ae0 606 return AVERROR(EAGAIN);
de6d9b64
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607 }
608
20f01548
PG
609 duration = (ffm->header[5] << 16) | (ffm->header[6] << 8) | ffm->header[7];
610
de6d9b64
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611 av_new_packet(pkt, size);
612 pkt->stream_index = ffm->header[0];
115329f1 613 pkt->pos = url_ftell(&s->pb);
de6d9b64
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614 if (ffm->header[1] & FLAG_KEY_FRAME)
615 pkt->flags |= PKT_FLAG_KEY;
4606ac8d 616
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617 ffm->read_state = READ_HEADER;
618 if (ffm_read_data(s, pkt->data, size, 0) != size) {
619 /* bad case: desynchronized packet. we cancel all the packet loading */
620 av_free_packet(pkt);
8fa36ae0 621 return AVERROR(EAGAIN);
de6d9b64 622 }
d271481f
MN
623 if (ffm->first_frame_in_packet)
624 {
625 pkt->pts = ffm->pts;
626 ffm->first_frame_in_packet = 0;
627 }
20f01548 628 pkt->duration = duration;
de6d9b64
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629 break;
630 }
631 return 0;
632}
633
634//#define DEBUG_SEEK
635
636/* pos is between 0 and file_size - FFM_PACKET_SIZE. It is translated
637 by the write position inside this function */
638static void ffm_seek1(AVFormatContext *s, offset_t pos1)
639{
640 FFMContext *ffm = s->priv_data;
641 ByteIOContext *pb = &s->pb;
642 offset_t pos;
643
644 pos = pos1 + ffm->write_index;
645 if (pos >= ffm->file_size)
646 pos -= (ffm->file_size - FFM_PACKET_SIZE);
647#ifdef DEBUG_SEEK
949b1a13 648 printf("seek to %"PRIx64" -> %"PRIx64"\n", pos1, pos);
de6d9b64
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649#endif
650 url_fseek(pb, pos, SEEK_SET);
651}
652
0c1a9eda 653static int64_t get_pts(AVFormatContext *s, offset_t pos)
de6d9b64
FB
654{
655 ByteIOContext *pb = &s->pb;
0c1a9eda 656 int64_t pts;
de6d9b64 657
4606ac8d 658 ffm_seek1(s, pos);
de6d9b64
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659 url_fskip(pb, 4);
660 pts = get_be64(pb);
661#ifdef DEBUG_SEEK
662 printf("pts=%0.6f\n", pts / 1000000.0);
663#endif
664 return pts;
665}
666
667/* seek to a given time in the file. The file read pointer is
668 positionned at or before pts. XXX: the following code is quite
669 approximative */
7b3c1382 670static int ffm_seek(AVFormatContext *s, int stream_index, int64_t wanted_pts, int flags)
de6d9b64
FB
671{
672 FFMContext *ffm = s->priv_data;
673 offset_t pos_min, pos_max, pos;
0c1a9eda 674 int64_t pts_min, pts_max, pts;
de6d9b64
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675 double pos1;
676
677#ifdef DEBUG_SEEK
678 printf("wanted_pts=%0.6f\n", wanted_pts / 1000000.0);
679#endif
680 /* find the position using linear interpolation (better than
681 dichotomy in typical cases) */
682 pos_min = 0;
683 pos_max = ffm->file_size - 2 * FFM_PACKET_SIZE;
684 while (pos_min <= pos_max) {
685 pts_min = get_pts(s, pos_min);
686 pts_max = get_pts(s, pos_max);
687 /* linear interpolation */
4606ac8d 688 pos1 = (double)(pos_max - pos_min) * (double)(wanted_pts - pts_min) /
de6d9b64 689 (double)(pts_max - pts_min);
0c1a9eda 690 pos = (((int64_t)pos1) / FFM_PACKET_SIZE) * FFM_PACKET_SIZE;
de6d9b64
FB
691 if (pos <= pos_min)
692 pos = pos_min;
693 else if (pos >= pos_max)
694 pos = pos_max;
695 pts = get_pts(s, pos);
696 /* check if we are lucky */
697 if (pts == wanted_pts) {
698 goto found;
699 } else if (pts > wanted_pts) {
700 pos_max = pos - FFM_PACKET_SIZE;
701 } else {
702 pos_min = pos + FFM_PACKET_SIZE;
703 }
704 }
7b3c1382 705 pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max;
de6d9b64
FB
706 if (pos > 0)
707 pos -= FFM_PACKET_SIZE;
708 found:
709 ffm_seek1(s, pos);
710 return 0;
711}
712
04f46ced 713#ifdef CONFIG_FFSERVER
de6d9b64
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714offset_t ffm_read_write_index(int fd)
715{
0c1a9eda 716 uint8_t buf[8];
de6d9b64
FB
717 offset_t pos;
718 int i;
719
720 lseek(fd, 8, SEEK_SET);
721 read(fd, buf, 8);
722 pos = 0;
4606ac8d 723 for(i=0;i<8;i++)
fa26a29d 724 pos |= (int64_t)buf[i] << (56 - i * 8);
de6d9b64
FB
725 return pos;
726}
727
728void ffm_write_write_index(int fd, offset_t pos)
729{
0c1a9eda 730 uint8_t buf[8];
de6d9b64
FB
731 int i;
732
4606ac8d 733 for(i=0;i<8;i++)
de6d9b64
FB
734 buf[i] = (pos >> (56 - i * 8)) & 0xff;
735 lseek(fd, 8, SEEK_SET);
736 write(fd, buf, 8);
737}
738
739void ffm_set_write_index(AVFormatContext *s, offset_t pos, offset_t file_size)
740{
741 FFMContext *ffm = s->priv_data;
742 ffm->write_index = pos;
743 ffm->file_size = file_size;
744}
04f46ced 745#endif // CONFIG_FFSERVER
de6d9b64
FB
746
747static int ffm_read_close(AVFormatContext *s)
748{
749 AVStream *st;
750 int i;
751
752 for(i=0;i<s->nb_streams;i++) {
753 st = s->streams[i];
789bee12 754 av_freep(&st->priv_data);
de6d9b64 755 }
de6d9b64
FB
756 return 0;
757}
758
07c4ed85
PG
759static int ffm_probe(AVProbeData *p)
760{
87e87886 761 if (
115329f1 762 p->buf[0] == 'F' && p->buf[1] == 'F' && p->buf[2] == 'M' &&
66d2ff2a 763 p->buf[3] == '1')
07c4ed85 764 return AVPROBE_SCORE_MAX + 1;
07c4ed85
PG
765 return 0;
766}
767
ff70e601
MR
768#ifdef CONFIG_FFM_DEMUXER
769AVInputFormat ffm_demuxer = {
c9a65ca8
FB
770 "ffm",
771 "ffm format",
66d2ff2a 772 sizeof(FFMContext),
07c4ed85 773 ffm_probe,
c9a65ca8
FB
774 ffm_read_header,
775 ffm_read_packet,
776 ffm_read_close,
777 ffm_seek,
c9a65ca8 778};
ff70e601
MR
779#endif
780#ifdef CONFIG_FFM_MUXER
781AVOutputFormat ffm_muxer = {
de6d9b64
FB
782 "ffm",
783 "ffm format",
784 "",
785 "ffm",
66d2ff2a 786 sizeof(FFMContext),
de6d9b64
FB
787 /* not really used */
788 CODEC_ID_MP2,
789 CODEC_ID_MPEG1VIDEO,
790 ffm_write_header,
791 ffm_write_packet,
792 ffm_write_trailer,
de6d9b64 793};
ff70e601 794#endif //CONFIG_FFM_MUXER