Fix ffm_close return type.
[libav.git] / libavformat / ffmdec.c
1 /*
2 * FFM (ffserver live feed) demuxer
3 * Copyright (c) 2001 Fabrice Bellard
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "libavutil/intreadwrite.h"
23 #include "avformat.h"
24 #include "ffm.h"
25 #if CONFIG_FFSERVER
26 #include <unistd.h>
27
28 int64_t ffm_read_write_index(int fd)
29 {
30 uint8_t buf[8];
31
32 lseek(fd, 8, SEEK_SET);
33 if (read(fd, buf, 8) != 8)
34 return AVERROR(EIO);
35 return AV_RB64(buf);
36 }
37
38 int ffm_write_write_index(int fd, int64_t pos)
39 {
40 uint8_t buf[8];
41 int i;
42
43 for(i=0;i<8;i++)
44 buf[i] = (pos >> (56 - i * 8)) & 0xff;
45 lseek(fd, 8, SEEK_SET);
46 if (write(fd, buf, 8) != 8)
47 return AVERROR(EIO);
48 return 8;
49 }
50
51 void ffm_set_write_index(AVFormatContext *s, int64_t pos, int64_t file_size)
52 {
53 FFMContext *ffm = s->priv_data;
54 ffm->write_index = pos;
55 ffm->file_size = file_size;
56 }
57 #endif // CONFIG_FFSERVER
58
59 static int ffm_is_avail_data(AVFormatContext *s, int size)
60 {
61 FFMContext *ffm = s->priv_data;
62 int64_t pos, avail_size;
63 int len;
64
65 len = ffm->packet_end - ffm->packet_ptr;
66 if (size <= len)
67 return 1;
68 pos = url_ftell(s->pb);
69 if (!ffm->write_index) {
70 if (pos == ffm->file_size)
71 return AVERROR_EOF;
72 avail_size = ffm->file_size - pos;
73 } else {
74 if (pos == ffm->write_index) {
75 /* exactly at the end of stream */
76 return AVERROR(EAGAIN);
77 } else if (pos < ffm->write_index) {
78 avail_size = ffm->write_index - pos;
79 } else {
80 avail_size = (ffm->file_size - pos) + (ffm->write_index - FFM_PACKET_SIZE);
81 }
82 }
83 avail_size = (avail_size / ffm->packet_size) * (ffm->packet_size - FFM_HEADER_SIZE) + len;
84 if (size <= avail_size)
85 return 1;
86 else
87 return AVERROR(EAGAIN);
88 }
89
90 static int ffm_resync(AVFormatContext *s, int state)
91 {
92 av_log(s, AV_LOG_ERROR, "resyncing\n");
93 while (state != PACKET_ID) {
94 if (url_feof(s->pb)) {
95 av_log(s, AV_LOG_ERROR, "cannot find FFM syncword\n");
96 return -1;
97 }
98 state = (state << 8) | get_byte(s->pb);
99 }
100 return 0;
101 }
102
103 /* first is true if we read the frame header */
104 static int ffm_read_data(AVFormatContext *s,
105 uint8_t *buf, int size, int header)
106 {
107 FFMContext *ffm = s->priv_data;
108 ByteIOContext *pb = s->pb;
109 int len, fill_size, size1, frame_offset, id;
110
111 size1 = size;
112 while (size > 0) {
113 redo:
114 len = ffm->packet_end - ffm->packet_ptr;
115 if (len < 0)
116 return -1;
117 if (len > size)
118 len = size;
119 if (len == 0) {
120 if (url_ftell(pb) == ffm->file_size)
121 url_fseek(pb, ffm->packet_size, SEEK_SET);
122 retry_read:
123 id = get_be16(pb); /* PACKET_ID */
124 if (id != PACKET_ID)
125 if (ffm_resync(s, id) < 0)
126 return -1;
127 fill_size = get_be16(pb);
128 ffm->dts = get_be64(pb);
129 frame_offset = get_be16(pb);
130 get_buffer(pb, ffm->packet, ffm->packet_size - FFM_HEADER_SIZE);
131 ffm->packet_end = ffm->packet + (ffm->packet_size - FFM_HEADER_SIZE - fill_size);
132 if (ffm->packet_end < ffm->packet || frame_offset < 0)
133 return -1;
134 /* if first packet or resynchronization packet, we must
135 handle it specifically */
136 if (ffm->first_packet || (frame_offset & 0x8000)) {
137 if (!frame_offset) {
138 /* This packet has no frame headers in it */
139 if (url_ftell(pb) >= ffm->packet_size * 3) {
140 url_fseek(pb, -ffm->packet_size * 2, SEEK_CUR);
141 goto retry_read;
142 }
143 /* This is bad, we cannot find a valid frame header */
144 return 0;
145 }
146 ffm->first_packet = 0;
147 if ((frame_offset & 0x7fff) < FFM_HEADER_SIZE)
148 return -1;
149 ffm->packet_ptr = ffm->packet + (frame_offset & 0x7fff) - FFM_HEADER_SIZE;
150 if (!header)
151 break;
152 } else {
153 ffm->packet_ptr = ffm->packet;
154 }
155 goto redo;
156 }
157 memcpy(buf, ffm->packet_ptr, len);
158 buf += len;
159 ffm->packet_ptr += len;
160 size -= len;
161 header = 0;
162 }
163 return size1 - size;
164 }
165
166 //#define DEBUG_SEEK
167
168 /* ensure that acutal seeking happens between FFM_PACKET_SIZE
169 and file_size - FFM_PACKET_SIZE */
170 static void ffm_seek1(AVFormatContext *s, int64_t pos1)
171 {
172 FFMContext *ffm = s->priv_data;
173 ByteIOContext *pb = s->pb;
174 int64_t pos;
175
176 pos = FFMIN(pos1, ffm->file_size - FFM_PACKET_SIZE);
177 pos = FFMAX(pos, FFM_PACKET_SIZE);
178 #ifdef DEBUG_SEEK
179 av_log(s, AV_LOG_DEBUG, "seek to %"PRIx64" -> %"PRIx64"\n", pos1, pos);
180 #endif
181 url_fseek(pb, pos, SEEK_SET);
182 }
183
184 static int64_t get_dts(AVFormatContext *s, int64_t pos)
185 {
186 ByteIOContext *pb = s->pb;
187 int64_t dts;
188
189 ffm_seek1(s, pos);
190 url_fskip(pb, 4);
191 dts = get_be64(pb);
192 #ifdef DEBUG_SEEK
193 av_log(s, AV_LOG_DEBUG, "dts=%0.6f\n", dts / 1000000.0);
194 #endif
195 return dts;
196 }
197
198 static void adjust_write_index(AVFormatContext *s)
199 {
200 FFMContext *ffm = s->priv_data;
201 ByteIOContext *pb = s->pb;
202 int64_t pts;
203 //int64_t orig_write_index = ffm->write_index;
204 int64_t pos_min, pos_max;
205 int64_t pts_start;
206 int64_t ptr = url_ftell(pb);
207
208
209 pos_min = 0;
210 pos_max = ffm->file_size - 2 * FFM_PACKET_SIZE;
211
212 pts_start = get_dts(s, pos_min);
213
214 pts = get_dts(s, pos_max);
215
216 if (pts - 100000 > pts_start)
217 goto end;
218
219 ffm->write_index = FFM_PACKET_SIZE;
220
221 pts_start = get_dts(s, pos_min);
222
223 pts = get_dts(s, pos_max);
224
225 if (pts - 100000 <= pts_start) {
226 while (1) {
227 int64_t newpos;
228 int64_t newpts;
229
230 newpos = ((pos_max + pos_min) / (2 * FFM_PACKET_SIZE)) * FFM_PACKET_SIZE;
231
232 if (newpos == pos_min)
233 break;
234
235 newpts = get_dts(s, newpos);
236
237 if (newpts - 100000 <= pts) {
238 pos_max = newpos;
239 pts = newpts;
240 } else {
241 pos_min = newpos;
242 }
243 }
244 ffm->write_index += pos_max;
245 }
246
247 //printf("Adjusted write index from %"PRId64" to %"PRId64": pts=%0.6f\n", orig_write_index, ffm->write_index, pts / 1000000.);
248 //printf("pts range %0.6f - %0.6f\n", get_dts(s, 0) / 1000000. , get_dts(s, ffm->file_size - 2 * FFM_PACKET_SIZE) / 1000000. );
249
250 end:
251 url_fseek(pb, ptr, SEEK_SET);
252 }
253
254
255 static int ffm_read_header(AVFormatContext *s, AVFormatParameters *ap)
256 {
257 FFMContext *ffm = s->priv_data;
258 AVStream *st;
259 ByteIOContext *pb = s->pb;
260 AVCodecContext *codec;
261 int i, nb_streams;
262 uint32_t tag;
263
264 /* header */
265 tag = get_le32(pb);
266 if (tag != MKTAG('F', 'F', 'M', '1'))
267 goto fail;
268 ffm->packet_size = get_be32(pb);
269 if (ffm->packet_size != FFM_PACKET_SIZE)
270 goto fail;
271 ffm->write_index = get_be64(pb);
272 /* get also filesize */
273 if (!url_is_streamed(pb)) {
274 ffm->file_size = url_fsize(pb);
275 if (ffm->write_index)
276 adjust_write_index(s);
277 } else {
278 ffm->file_size = (UINT64_C(1) << 63) - 1;
279 }
280
281 nb_streams = get_be32(pb);
282 get_be32(pb); /* total bitrate */
283 /* read each stream */
284 for(i=0;i<nb_streams;i++) {
285 char rc_eq_buf[128];
286
287 st = av_new_stream(s, 0);
288 if (!st)
289 goto fail;
290
291 av_set_pts_info(st, 64, 1, 1000000);
292
293 codec = st->codec;
294 /* generic info */
295 codec->codec_id = get_be32(pb);
296 codec->codec_type = get_byte(pb); /* codec_type */
297 codec->bit_rate = get_be32(pb);
298 st->quality = get_be32(pb);
299 codec->flags = get_be32(pb);
300 codec->flags2 = get_be32(pb);
301 codec->debug = get_be32(pb);
302 /* specific info */
303 switch(codec->codec_type) {
304 case CODEC_TYPE_VIDEO:
305 codec->time_base.num = get_be32(pb);
306 codec->time_base.den = get_be32(pb);
307 codec->width = get_be16(pb);
308 codec->height = get_be16(pb);
309 codec->gop_size = get_be16(pb);
310 codec->pix_fmt = get_be32(pb);
311 codec->qmin = get_byte(pb);
312 codec->qmax = get_byte(pb);
313 codec->max_qdiff = get_byte(pb);
314 codec->qcompress = get_be16(pb) / 10000.0;
315 codec->qblur = get_be16(pb) / 10000.0;
316 codec->bit_rate_tolerance = get_be32(pb);
317 codec->rc_eq = av_strdup(get_strz(pb, rc_eq_buf, sizeof(rc_eq_buf)));
318 codec->rc_max_rate = get_be32(pb);
319 codec->rc_min_rate = get_be32(pb);
320 codec->rc_buffer_size = get_be32(pb);
321 codec->i_quant_factor = av_int2dbl(get_be64(pb));
322 codec->b_quant_factor = av_int2dbl(get_be64(pb));
323 codec->i_quant_offset = av_int2dbl(get_be64(pb));
324 codec->b_quant_offset = av_int2dbl(get_be64(pb));
325 codec->dct_algo = get_be32(pb);
326 codec->strict_std_compliance = get_be32(pb);
327 codec->max_b_frames = get_be32(pb);
328 codec->luma_elim_threshold = get_be32(pb);
329 codec->chroma_elim_threshold = get_be32(pb);
330 codec->mpeg_quant = get_be32(pb);
331 codec->intra_dc_precision = get_be32(pb);
332 codec->me_method = get_be32(pb);
333 codec->mb_decision = get_be32(pb);
334 codec->nsse_weight = get_be32(pb);
335 codec->frame_skip_cmp = get_be32(pb);
336 codec->rc_buffer_aggressivity = av_int2dbl(get_be64(pb));
337 codec->codec_tag = get_be32(pb);
338 codec->thread_count = get_byte(pb);
339 codec->coder_type = get_be32(pb);
340 codec->me_cmp = get_be32(pb);
341 codec->partitions = get_be32(pb);
342 codec->me_subpel_quality = get_be32(pb);
343 codec->me_range = get_be32(pb);
344 codec->keyint_min = get_be32(pb);
345 codec->scenechange_threshold = get_be32(pb);
346 codec->b_frame_strategy = get_be32(pb);
347 codec->qcompress = av_int2dbl(get_be64(pb));
348 codec->qblur = av_int2dbl(get_be64(pb));
349 codec->max_qdiff = get_be32(pb);
350 codec->refs = get_be32(pb);
351 codec->directpred = get_be32(pb);
352 break;
353 case CODEC_TYPE_AUDIO:
354 codec->sample_rate = get_be32(pb);
355 codec->channels = get_le16(pb);
356 codec->frame_size = get_le16(pb);
357 codec->sample_fmt = get_le16(pb);
358 break;
359 default:
360 goto fail;
361 }
362 if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) {
363 codec->extradata_size = get_be32(pb);
364 codec->extradata = av_malloc(codec->extradata_size);
365 if (!codec->extradata)
366 return AVERROR(ENOMEM);
367 get_buffer(pb, codec->extradata, codec->extradata_size);
368 }
369 }
370
371 /* get until end of block reached */
372 while ((url_ftell(pb) % ffm->packet_size) != 0)
373 get_byte(pb);
374
375 /* init packet demux */
376 ffm->packet_ptr = ffm->packet;
377 ffm->packet_end = ffm->packet;
378 ffm->frame_offset = 0;
379 ffm->dts = 0;
380 ffm->read_state = READ_HEADER;
381 ffm->first_packet = 1;
382 return 0;
383 fail:
384 for(i=0;i<s->nb_streams;i++) {
385 st = s->streams[i];
386 if (st) {
387 av_free(st);
388 }
389 }
390 return -1;
391 }
392
393 /* return < 0 if eof */
394 static int ffm_read_packet(AVFormatContext *s, AVPacket *pkt)
395 {
396 int size;
397 FFMContext *ffm = s->priv_data;
398 int duration, ret;
399
400 switch(ffm->read_state) {
401 case READ_HEADER:
402 if ((ret = ffm_is_avail_data(s, FRAME_HEADER_SIZE+4)) < 0)
403 return ret;
404
405 dprintf(s, "pos=%08"PRIx64" spos=%"PRIx64", write_index=%"PRIx64" size=%"PRIx64"\n",
406 url_ftell(s->pb), s->pb->pos, ffm->write_index, ffm->file_size);
407 if (ffm_read_data(s, ffm->header, FRAME_HEADER_SIZE, 1) !=
408 FRAME_HEADER_SIZE)
409 return -1;
410 if (ffm->header[1] & FLAG_DTS)
411 if (ffm_read_data(s, ffm->header+16, 4, 1) != 4)
412 return -1;
413 #if 0
414 av_hexdump_log(s, AV_LOG_DEBUG, ffm->header, FRAME_HEADER_SIZE);
415 #endif
416 ffm->read_state = READ_DATA;
417 /* fall thru */
418 case READ_DATA:
419 size = AV_RB24(ffm->header + 2);
420 if ((ret = ffm_is_avail_data(s, size)) < 0)
421 return ret;
422
423 duration = AV_RB24(ffm->header + 5);
424
425 av_new_packet(pkt, size);
426 pkt->stream_index = ffm->header[0];
427 if ((unsigned)pkt->stream_index >= s->nb_streams) {
428 av_log(s, AV_LOG_ERROR, "invalid stream index %d\n", pkt->stream_index);
429 av_free_packet(pkt);
430 ffm->read_state = READ_HEADER;
431 return -1;
432 }
433 pkt->pos = url_ftell(s->pb);
434 if (ffm->header[1] & FLAG_KEY_FRAME)
435 pkt->flags |= PKT_FLAG_KEY;
436
437 ffm->read_state = READ_HEADER;
438 if (ffm_read_data(s, pkt->data, size, 0) != size) {
439 /* bad case: desynchronized packet. we cancel all the packet loading */
440 av_free_packet(pkt);
441 return -1;
442 }
443 pkt->pts = AV_RB64(ffm->header+8);
444 if (ffm->header[1] & FLAG_DTS)
445 pkt->dts = pkt->pts - AV_RB32(ffm->header+16);
446 else
447 pkt->dts = pkt->pts;
448 pkt->duration = duration;
449 break;
450 }
451 return 0;
452 }
453
454 /* seek to a given time in the file. The file read pointer is
455 positioned at or before pts. XXX: the following code is quite
456 approximative */
457 static int ffm_seek(AVFormatContext *s, int stream_index, int64_t wanted_pts, int flags)
458 {
459 FFMContext *ffm = s->priv_data;
460 int64_t pos_min, pos_max, pos;
461 int64_t pts_min, pts_max, pts;
462 double pos1;
463
464 #ifdef DEBUG_SEEK
465 av_log(s, AV_LOG_DEBUG, "wanted_pts=%0.6f\n", wanted_pts / 1000000.0);
466 #endif
467 /* find the position using linear interpolation (better than
468 dichotomy in typical cases) */
469 pos_min = FFM_PACKET_SIZE;
470 pos_max = ffm->file_size - FFM_PACKET_SIZE;
471 while (pos_min <= pos_max) {
472 pts_min = get_dts(s, pos_min);
473 pts_max = get_dts(s, pos_max);
474 /* linear interpolation */
475 pos1 = (double)(pos_max - pos_min) * (double)(wanted_pts - pts_min) /
476 (double)(pts_max - pts_min);
477 pos = (((int64_t)pos1) / FFM_PACKET_SIZE) * FFM_PACKET_SIZE;
478 if (pos <= pos_min)
479 pos = pos_min;
480 else if (pos >= pos_max)
481 pos = pos_max;
482 pts = get_dts(s, pos);
483 /* check if we are lucky */
484 if (pts == wanted_pts) {
485 goto found;
486 } else if (pts > wanted_pts) {
487 pos_max = pos - FFM_PACKET_SIZE;
488 } else {
489 pos_min = pos + FFM_PACKET_SIZE;
490 }
491 }
492 pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max;
493
494 found:
495 ffm_seek1(s, pos);
496
497 /* reset read state */
498 ffm->read_state = READ_HEADER;
499 ffm->packet_ptr = ffm->packet;
500 ffm->packet_end = ffm->packet;
501 ffm->first_packet = 1;
502
503 return 0;
504 }
505
506 static int ffm_probe(AVProbeData *p)
507 {
508 if (
509 p->buf[0] == 'F' && p->buf[1] == 'F' && p->buf[2] == 'M' &&
510 p->buf[3] == '1')
511 return AVPROBE_SCORE_MAX + 1;
512 return 0;
513 }
514
515 static int ffm_close(AVFormatContext *s)
516 {
517 int i;
518
519 for (i = 0; i < s->nb_streams; i++)
520 av_freep(&s->streams[i]->codec->rc_eq);
521
522 return 0;
523 }
524
525 AVInputFormat ffm_demuxer = {
526 "ffm",
527 NULL_IF_CONFIG_SMALL("FFM (FFserver live feed) format"),
528 sizeof(FFMContext),
529 ffm_probe,
530 ffm_read_header,
531 ffm_read_packet,
532 ffm_close,
533 ffm_seek,
534 };