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00024 #include "libavutil/pixdesc.h"
00025 #include "libavutil/rational.h"
00026 #include "libavutil/audioconvert.h"
00027 #include "libavutil/imgutils.h"
00028 #include "libavutil/avassert.h"
00029 #include "avfilter.h"
00030 #include "internal.h"
00031
00032 unsigned avfilter_version(void) {
00033 return LIBAVFILTER_VERSION_INT;
00034 }
00035
00036 const char *avfilter_configuration(void)
00037 {
00038 return FFMPEG_CONFIGURATION;
00039 }
00040
00041 const char *avfilter_license(void)
00042 {
00043 #define LICENSE_PREFIX "libavfilter license: "
00044 return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
00045 }
00046
00047 AVFilterBufferRef *avfilter_ref_buffer(AVFilterBufferRef *ref, int pmask)
00048 {
00049 AVFilterBufferRef *ret = av_malloc(sizeof(AVFilterBufferRef));
00050 if (!ret)
00051 return NULL;
00052 *ret = *ref;
00053 if (ref->type == AVMEDIA_TYPE_VIDEO) {
00054 ret->video = av_malloc(sizeof(AVFilterBufferRefVideoProps));
00055 if (!ret->video) {
00056 av_free(ret);
00057 return NULL;
00058 }
00059 *ret->video = *ref->video;
00060 } else if (ref->type == AVMEDIA_TYPE_AUDIO) {
00061 ret->audio = av_malloc(sizeof(AVFilterBufferRefAudioProps));
00062 if (!ret->audio) {
00063 av_free(ret);
00064 return NULL;
00065 }
00066 *ret->audio = *ref->audio;
00067 }
00068 ret->perms &= pmask;
00069 ret->buf->refcount ++;
00070 return ret;
00071 }
00072
00073 static void store_in_pool(AVFilterBufferRef *ref)
00074 {
00075 int i;
00076 AVFilterPool *pool= ref->buf->priv;
00077
00078 av_assert0(ref->buf->data[0]);
00079
00080 if (pool->count == POOL_SIZE) {
00081 AVFilterBufferRef *ref1 = pool->pic[0];
00082 av_freep(&ref1->video);
00083 av_freep(&ref1->audio);
00084 av_freep(&ref1->buf->data[0]);
00085 av_freep(&ref1->buf);
00086 av_free(ref1);
00087 memmove(&pool->pic[0], &pool->pic[1], sizeof(void*)*(POOL_SIZE-1));
00088 pool->count--;
00089 pool->pic[POOL_SIZE-1] = NULL;
00090 }
00091
00092 for (i = 0; i < POOL_SIZE; i++) {
00093 if (!pool->pic[i]) {
00094 pool->pic[i] = ref;
00095 pool->count++;
00096 break;
00097 }
00098 }
00099 }
00100
00101 void avfilter_unref_buffer(AVFilterBufferRef *ref)
00102 {
00103 if (!ref)
00104 return;
00105 if (!(--ref->buf->refcount)) {
00106 if (!ref->buf->free) {
00107 store_in_pool(ref);
00108 return;
00109 }
00110 ref->buf->free(ref->buf);
00111 }
00112 av_freep(&ref->video);
00113 av_freep(&ref->audio);
00114 av_free(ref);
00115 }
00116
00117 void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
00118 AVFilterPad **pads, AVFilterLink ***links,
00119 AVFilterPad *newpad)
00120 {
00121 unsigned i;
00122
00123 idx = FFMIN(idx, *count);
00124
00125 *pads = av_realloc(*pads, sizeof(AVFilterPad) * (*count + 1));
00126 *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
00127 memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad) * (*count-idx));
00128 memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
00129 memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
00130 (*links)[idx] = NULL;
00131
00132 (*count)++;
00133 for (i = idx+1; i < *count; i++)
00134 if (*links[i])
00135 (*(unsigned *)((uint8_t *) *links[i] + padidx_off))++;
00136 }
00137
00138 int avfilter_link(AVFilterContext *src, unsigned srcpad,
00139 AVFilterContext *dst, unsigned dstpad)
00140 {
00141 AVFilterLink *link;
00142
00143 if (src->output_count <= srcpad || dst->input_count <= dstpad ||
00144 src->outputs[srcpad] || dst->inputs[dstpad])
00145 return -1;
00146
00147 if (src->output_pads[srcpad].type != dst->input_pads[dstpad].type) {
00148 av_log(src, AV_LOG_ERROR,
00149 "Media type mismatch between the '%s' filter output pad %d and the '%s' filter input pad %d\n",
00150 src->name, srcpad, dst->name, dstpad);
00151 return AVERROR(EINVAL);
00152 }
00153
00154 src->outputs[srcpad] =
00155 dst-> inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink));
00156
00157 link->src = src;
00158 link->dst = dst;
00159 link->srcpad = &src->output_pads[srcpad];
00160 link->dstpad = &dst->input_pads[dstpad];
00161 link->type = src->output_pads[srcpad].type;
00162 assert(PIX_FMT_NONE == -1 && AV_SAMPLE_FMT_NONE == -1);
00163 link->format = -1;
00164
00165 return 0;
00166 }
00167
00168 void avfilter_link_free(AVFilterLink **link)
00169 {
00170 if (!*link)
00171 return;
00172
00173 if ((*link)->pool) {
00174 int i;
00175 for (i = 0; i < POOL_SIZE; i++) {
00176 if ((*link)->pool->pic[i]) {
00177 AVFilterBufferRef *picref = (*link)->pool->pic[i];
00178
00179
00180 av_freep(&picref->buf->data[0]);
00181 av_freep(&picref->buf);
00182
00183 av_freep(&picref->audio);
00184 av_freep(&picref->video);
00185 av_freep(&(*link)->pool->pic[i]);
00186 }
00187 }
00188 (*link)->pool->count = 0;
00189
00190 }
00191 av_freep(link);
00192 }
00193
00194 int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
00195 unsigned filt_srcpad_idx, unsigned filt_dstpad_idx)
00196 {
00197 int ret;
00198 unsigned dstpad_idx = link->dstpad - link->dst->input_pads;
00199
00200 av_log(link->dst, AV_LOG_INFO, "auto-inserting filter '%s' "
00201 "between the filter '%s' and the filter '%s'\n",
00202 filt->name, link->src->name, link->dst->name);
00203
00204 link->dst->inputs[dstpad_idx] = NULL;
00205 if ((ret = avfilter_link(filt, filt_dstpad_idx, link->dst, dstpad_idx)) < 0) {
00206
00207 link->dst->inputs[dstpad_idx] = link;
00208 return ret;
00209 }
00210
00211
00212 link->dst = filt;
00213 link->dstpad = &filt->input_pads[filt_srcpad_idx];
00214 filt->inputs[filt_srcpad_idx] = link;
00215
00216
00217
00218 if (link->out_formats)
00219 avfilter_formats_changeref(&link->out_formats,
00220 &filt->outputs[filt_dstpad_idx]->out_formats);
00221 if (link->out_chlayouts)
00222 avfilter_formats_changeref(&link->out_chlayouts,
00223 &filt->outputs[filt_dstpad_idx]->out_chlayouts);
00224
00225 return 0;
00226 }
00227
00228 int avfilter_config_links(AVFilterContext *filter)
00229 {
00230 int (*config_link)(AVFilterLink *);
00231 unsigned i;
00232 int ret;
00233
00234 for (i = 0; i < filter->input_count; i ++) {
00235 AVFilterLink *link = filter->inputs[i];
00236
00237 if (!link) continue;
00238
00239 switch (link->init_state) {
00240 case AVLINK_INIT:
00241 continue;
00242 case AVLINK_STARTINIT:
00243 av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");
00244 return 0;
00245 case AVLINK_UNINIT:
00246 link->init_state = AVLINK_STARTINIT;
00247
00248 if ((ret = avfilter_config_links(link->src)) < 0)
00249 return ret;
00250
00251 if (!(config_link = link->srcpad->config_props))
00252 config_link = avfilter_default_config_output_link;
00253 if ((ret = config_link(link)) < 0)
00254 return ret;
00255
00256 if (link->time_base.num == 0 && link->time_base.den == 0)
00257 link->time_base = link->src && link->src->input_count ?
00258 link->src->inputs[0]->time_base : AV_TIME_BASE_Q;
00259
00260 if (link->sample_aspect_ratio.num == 0 && link->sample_aspect_ratio.den == 0)
00261 link->sample_aspect_ratio = link->src->input_count ?
00262 link->src->inputs[0]->sample_aspect_ratio : (AVRational){1,1};
00263
00264 if (link->sample_rate == 0 && link->src && link->src->input_count)
00265 link->sample_rate = link->src->inputs[0]->sample_rate;
00266
00267 if (link->channel_layout == 0 && link->src && link->src->input_count)
00268 link->channel_layout = link->src->inputs[0]->channel_layout;
00269
00270 if ((config_link = link->dstpad->config_props))
00271 if ((ret = config_link(link)) < 0)
00272 return ret;
00273
00274 link->init_state = AVLINK_INIT;
00275 }
00276 }
00277
00278 return 0;
00279 }
00280
00281 static char *ff_get_ref_perms_string(char *buf, size_t buf_size, int perms)
00282 {
00283 snprintf(buf, buf_size, "%s%s%s%s%s%s",
00284 perms & AV_PERM_READ ? "r" : "",
00285 perms & AV_PERM_WRITE ? "w" : "",
00286 perms & AV_PERM_PRESERVE ? "p" : "",
00287 perms & AV_PERM_REUSE ? "u" : "",
00288 perms & AV_PERM_REUSE2 ? "U" : "",
00289 perms & AV_PERM_NEG_LINESIZES ? "n" : "");
00290 return buf;
00291 }
00292
00293 static void ff_dlog_ref(void *ctx, AVFilterBufferRef *ref, int end)
00294 {
00295 av_unused char buf[16];
00296 av_dlog(ctx,
00297 "ref[%p buf:%p refcount:%d perms:%s data:%p linesize[%d, %d, %d, %d] pts:%"PRId64" pos:%"PRId64,
00298 ref, ref->buf, ref->buf->refcount, ff_get_ref_perms_string(buf, sizeof(buf), ref->perms), ref->data[0],
00299 ref->linesize[0], ref->linesize[1], ref->linesize[2], ref->linesize[3],
00300 ref->pts, ref->pos);
00301
00302 if (ref->video) {
00303 av_dlog(ctx, " a:%d/%d s:%dx%d i:%c iskey:%d type:%c",
00304 ref->video->sample_aspect_ratio.num, ref->video->sample_aspect_ratio.den,
00305 ref->video->w, ref->video->h,
00306 !ref->video->interlaced ? 'P' :
00307 ref->video->top_field_first ? 'T' : 'B',
00308 ref->video->key_frame,
00309 av_get_picture_type_char(ref->video->pict_type));
00310 }
00311 if (ref->audio) {
00312 av_dlog(ctx, " cl:%"PRId64"d n:%d r:%d p:%d",
00313 ref->audio->channel_layout,
00314 ref->audio->nb_samples,
00315 ref->audio->sample_rate,
00316 ref->audio->planar);
00317 }
00318
00319 av_dlog(ctx, "]%s", end ? "\n" : "");
00320 }
00321
00322 static void ff_dlog_link(void *ctx, AVFilterLink *link, int end)
00323 {
00324 if (link->type == AVMEDIA_TYPE_VIDEO) {
00325 av_dlog(ctx,
00326 "link[%p s:%dx%d fmt:%-16s %-16s->%-16s]%s",
00327 link, link->w, link->h,
00328 av_pix_fmt_descriptors[link->format].name,
00329 link->src ? link->src->filter->name : "",
00330 link->dst ? link->dst->filter->name : "",
00331 end ? "\n" : "");
00332 } else {
00333 char buf[128];
00334 av_get_channel_layout_string(buf, sizeof(buf), -1, link->channel_layout);
00335
00336 av_dlog(ctx,
00337 "link[%p r:%"PRId64" cl:%s fmt:%-16s %-16s->%-16s]%s",
00338 link, link->sample_rate, buf,
00339 av_get_sample_fmt_name(link->format),
00340 link->src ? link->src->filter->name : "",
00341 link->dst ? link->dst->filter->name : "",
00342 end ? "\n" : "");
00343 }
00344 }
00345
00346 #define FF_DPRINTF_START(ctx, func) av_dlog(NULL, "%-16s: ", #func)
00347
00348 AVFilterBufferRef *avfilter_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
00349 {
00350 AVFilterBufferRef *ret = NULL;
00351
00352 av_unused char buf[16];
00353 FF_DPRINTF_START(NULL, get_video_buffer); ff_dlog_link(NULL, link, 0);
00354 av_dlog(NULL, " perms:%s w:%d h:%d\n", ff_get_ref_perms_string(buf, sizeof(buf), perms), w, h);
00355
00356 if (link->dstpad->get_video_buffer)
00357 ret = link->dstpad->get_video_buffer(link, perms, w, h);
00358
00359 if (!ret)
00360 ret = avfilter_default_get_video_buffer(link, perms, w, h);
00361
00362 if (ret)
00363 ret->type = AVMEDIA_TYPE_VIDEO;
00364
00365 FF_DPRINTF_START(NULL, get_video_buffer); ff_dlog_link(NULL, link, 0); av_dlog(NULL, " returning "); ff_dlog_ref(NULL, ret, 1);
00366
00367 return ret;
00368 }
00369
00370 AVFilterBufferRef *
00371 avfilter_get_video_buffer_ref_from_arrays(uint8_t * const data[4], const int linesize[4], int perms,
00372 int w, int h, enum PixelFormat format)
00373 {
00374 AVFilterBuffer *pic = av_mallocz(sizeof(AVFilterBuffer));
00375 AVFilterBufferRef *picref = av_mallocz(sizeof(AVFilterBufferRef));
00376
00377 if (!pic || !picref)
00378 goto fail;
00379
00380 picref->buf = pic;
00381 picref->buf->free = ff_avfilter_default_free_buffer;
00382 if (!(picref->video = av_mallocz(sizeof(AVFilterBufferRefVideoProps))))
00383 goto fail;
00384
00385 pic->w = picref->video->w = w;
00386 pic->h = picref->video->h = h;
00387
00388
00389 picref->perms = perms | AV_PERM_READ;
00390
00391 pic->refcount = 1;
00392 picref->type = AVMEDIA_TYPE_VIDEO;
00393 pic->format = picref->format = format;
00394
00395 memcpy(pic->data, data, sizeof(pic->data));
00396 memcpy(pic->linesize, linesize, sizeof(pic->linesize));
00397 memcpy(picref->data, pic->data, sizeof(picref->data));
00398 memcpy(picref->linesize, pic->linesize, sizeof(picref->linesize));
00399
00400 return picref;
00401
00402 fail:
00403 if (picref && picref->video)
00404 av_free(picref->video);
00405 av_free(picref);
00406 av_free(pic);
00407 return NULL;
00408 }
00409
00410 AVFilterBufferRef *avfilter_get_audio_buffer(AVFilterLink *link, int perms,
00411 enum AVSampleFormat sample_fmt, int nb_samples,
00412 int64_t channel_layout, int planar)
00413 {
00414 AVFilterBufferRef *ret = NULL;
00415
00416 if (link->dstpad->get_audio_buffer)
00417 ret = link->dstpad->get_audio_buffer(link, perms, sample_fmt, nb_samples, channel_layout, planar);
00418
00419 if (!ret)
00420 ret = avfilter_default_get_audio_buffer(link, perms, sample_fmt, nb_samples, channel_layout, planar);
00421
00422 if (ret)
00423 ret->type = AVMEDIA_TYPE_AUDIO;
00424
00425 return ret;
00426 }
00427
00428 AVFilterBufferRef *
00429 avfilter_get_audio_buffer_ref_from_arrays(uint8_t *data[8], int linesize[8], int perms,
00430 int nb_samples, enum AVSampleFormat sample_fmt,
00431 int64_t channel_layout, int planar)
00432 {
00433 AVFilterBuffer *samples = av_mallocz(sizeof(AVFilterBuffer));
00434 AVFilterBufferRef *samplesref = av_mallocz(sizeof(AVFilterBufferRef));
00435
00436 if (!samples || !samplesref)
00437 goto fail;
00438
00439 samplesref->buf = samples;
00440 samplesref->buf->free = ff_avfilter_default_free_buffer;
00441 if (!(samplesref->audio = av_mallocz(sizeof(AVFilterBufferRefAudioProps))))
00442 goto fail;
00443
00444 samplesref->audio->nb_samples = nb_samples;
00445 samplesref->audio->channel_layout = channel_layout;
00446 samplesref->audio->planar = planar;
00447
00448
00449 samplesref->perms = perms | AV_PERM_READ;
00450
00451 samples->refcount = 1;
00452 samplesref->type = AVMEDIA_TYPE_AUDIO;
00453 samplesref->format = sample_fmt;
00454
00455 memcpy(samples->data, data, sizeof(samples->data));
00456 memcpy(samples->linesize, linesize, sizeof(samples->linesize));
00457 memcpy(samplesref->data, data, sizeof(samplesref->data));
00458 memcpy(samplesref->linesize, linesize, sizeof(samplesref->linesize));
00459
00460 return samplesref;
00461
00462 fail:
00463 if (samplesref && samplesref->audio)
00464 av_freep(&samplesref->audio);
00465 av_freep(&samplesref);
00466 av_freep(&samples);
00467 return NULL;
00468 }
00469
00470 int avfilter_request_frame(AVFilterLink *link)
00471 {
00472 FF_DPRINTF_START(NULL, request_frame); ff_dlog_link(NULL, link, 1);
00473
00474 if (link->srcpad->request_frame)
00475 return link->srcpad->request_frame(link);
00476 else if (link->src->inputs[0])
00477 return avfilter_request_frame(link->src->inputs[0]);
00478 else return -1;
00479 }
00480
00481 int avfilter_poll_frame(AVFilterLink *link)
00482 {
00483 int i, min = INT_MAX;
00484
00485 if (link->srcpad->poll_frame)
00486 return link->srcpad->poll_frame(link);
00487
00488 for (i = 0; i < link->src->input_count; i++) {
00489 int val;
00490 if (!link->src->inputs[i])
00491 return -1;
00492 val = avfilter_poll_frame(link->src->inputs[i]);
00493 min = FFMIN(min, val);
00494 }
00495
00496 return min;
00497 }
00498
00499
00500
00501 void avfilter_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
00502 {
00503 void (*start_frame)(AVFilterLink *, AVFilterBufferRef *);
00504 AVFilterPad *dst = link->dstpad;
00505 int perms = picref->perms;
00506
00507 FF_DPRINTF_START(NULL, start_frame); ff_dlog_link(NULL, link, 0); av_dlog(NULL, " "); ff_dlog_ref(NULL, picref, 1);
00508
00509 if (!(start_frame = dst->start_frame))
00510 start_frame = avfilter_default_start_frame;
00511
00512 if (picref->linesize[0] < 0)
00513 perms |= AV_PERM_NEG_LINESIZES;
00514
00515 if ((dst->min_perms & perms) != dst->min_perms || dst->rej_perms & perms) {
00516 av_log(link->dst, AV_LOG_DEBUG,
00517 "frame copy needed (have perms %x, need %x, reject %x)\n",
00518 picref->perms,
00519 link->dstpad->min_perms, link->dstpad->rej_perms);
00520
00521 link->cur_buf = avfilter_get_video_buffer(link, dst->min_perms, link->w, link->h);
00522 link->src_buf = picref;
00523 avfilter_copy_buffer_ref_props(link->cur_buf, link->src_buf);
00524 }
00525 else
00526 link->cur_buf = picref;
00527
00528 start_frame(link, link->cur_buf);
00529 }
00530
00531 void avfilter_end_frame(AVFilterLink *link)
00532 {
00533 void (*end_frame)(AVFilterLink *);
00534
00535 if (!(end_frame = link->dstpad->end_frame))
00536 end_frame = avfilter_default_end_frame;
00537
00538 end_frame(link);
00539
00540
00541
00542 if (link->src_buf) {
00543 avfilter_unref_buffer(link->src_buf);
00544 link->src_buf = NULL;
00545 }
00546 }
00547
00548 void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
00549 {
00550 uint8_t *src[4], *dst[4];
00551 int i, j, vsub;
00552 void (*draw_slice)(AVFilterLink *, int, int, int);
00553
00554 FF_DPRINTF_START(NULL, draw_slice); ff_dlog_link(NULL, link, 0); av_dlog(NULL, " y:%d h:%d dir:%d\n", y, h, slice_dir);
00555
00556
00557 if (link->src_buf) {
00558 vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
00559
00560 for (i = 0; i < 4; i++) {
00561 if (link->src_buf->data[i]) {
00562 src[i] = link->src_buf-> data[i] +
00563 (y >> (i==1 || i==2 ? vsub : 0)) * link->src_buf-> linesize[i];
00564 dst[i] = link->cur_buf->data[i] +
00565 (y >> (i==1 || i==2 ? vsub : 0)) * link->cur_buf->linesize[i];
00566 } else
00567 src[i] = dst[i] = NULL;
00568 }
00569
00570 for (i = 0; i < 4; i++) {
00571 int planew =
00572 av_image_get_linesize(link->format, link->cur_buf->video->w, i);
00573
00574 if (!src[i]) continue;
00575
00576 for (j = 0; j < h >> (i==1 || i==2 ? vsub : 0); j++) {
00577 memcpy(dst[i], src[i], planew);
00578 src[i] += link->src_buf->linesize[i];
00579 dst[i] += link->cur_buf->linesize[i];
00580 }
00581 }
00582 }
00583
00584 if (!(draw_slice = link->dstpad->draw_slice))
00585 draw_slice = avfilter_default_draw_slice;
00586 draw_slice(link, y, h, slice_dir);
00587 }
00588
00589 void avfilter_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
00590 {
00591 void (*filter_samples)(AVFilterLink *, AVFilterBufferRef *);
00592 AVFilterPad *dst = link->dstpad;
00593 int i;
00594
00595 FF_DPRINTF_START(NULL, filter_samples); ff_dlog_link(NULL, link, 1);
00596
00597 if (!(filter_samples = dst->filter_samples))
00598 filter_samples = avfilter_default_filter_samples;
00599
00600
00601 if ((dst->min_perms & samplesref->perms) != dst->min_perms ||
00602 dst->rej_perms & samplesref->perms) {
00603
00604 av_log(link->dst, AV_LOG_DEBUG,
00605 "Copying audio data in avfilter (have perms %x, need %x, reject %x)\n",
00606 samplesref->perms, link->dstpad->min_perms, link->dstpad->rej_perms);
00607
00608 link->cur_buf = avfilter_default_get_audio_buffer(link, dst->min_perms,
00609 samplesref->format,
00610 samplesref->audio->nb_samples,
00611 samplesref->audio->channel_layout,
00612 samplesref->audio->planar);
00613 link->cur_buf->pts = samplesref->pts;
00614 link->cur_buf->audio->sample_rate = samplesref->audio->sample_rate;
00615
00616
00617 for (i = 0; samplesref->data[i] && i < 8; i++)
00618 memcpy(link->cur_buf->data[i], samplesref->data[i], samplesref->linesize[0]);
00619
00620 avfilter_unref_buffer(samplesref);
00621 } else
00622 link->cur_buf = samplesref;
00623
00624 filter_samples(link, link->cur_buf);
00625 }
00626
00627 #define MAX_REGISTERED_AVFILTERS_NB 64
00628
00629 static AVFilter *registered_avfilters[MAX_REGISTERED_AVFILTERS_NB + 1];
00630
00631 static int next_registered_avfilter_idx = 0;
00632
00633 AVFilter *avfilter_get_by_name(const char *name)
00634 {
00635 int i;
00636
00637 for (i = 0; registered_avfilters[i]; i++)
00638 if (!strcmp(registered_avfilters[i]->name, name))
00639 return registered_avfilters[i];
00640
00641 return NULL;
00642 }
00643
00644 int avfilter_register(AVFilter *filter)
00645 {
00646 if (next_registered_avfilter_idx == MAX_REGISTERED_AVFILTERS_NB)
00647 return -1;
00648
00649 registered_avfilters[next_registered_avfilter_idx++] = filter;
00650 return 0;
00651 }
00652
00653 AVFilter **av_filter_next(AVFilter **filter)
00654 {
00655 return filter ? ++filter : ®istered_avfilters[0];
00656 }
00657
00658 void avfilter_uninit(void)
00659 {
00660 memset(registered_avfilters, 0, sizeof(registered_avfilters));
00661 next_registered_avfilter_idx = 0;
00662 }
00663
00664 static int pad_count(const AVFilterPad *pads)
00665 {
00666 int count;
00667
00668 for(count = 0; pads->name; count ++) pads ++;
00669 return count;
00670 }
00671
00672 static const char *filter_name(void *p)
00673 {
00674 AVFilterContext *filter = p;
00675 return filter->filter->name;
00676 }
00677
00678 static const AVClass avfilter_class = {
00679 "AVFilter",
00680 filter_name,
00681 NULL,
00682 LIBAVUTIL_VERSION_INT,
00683 };
00684
00685 int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name)
00686 {
00687 AVFilterContext *ret;
00688 *filter_ctx = NULL;
00689
00690 if (!filter)
00691 return AVERROR(EINVAL);
00692
00693 ret = av_mallocz(sizeof(AVFilterContext));
00694 if (!ret)
00695 return AVERROR(ENOMEM);
00696
00697 ret->av_class = &avfilter_class;
00698 ret->filter = filter;
00699 ret->name = inst_name ? av_strdup(inst_name) : NULL;
00700 if (filter->priv_size) {
00701 ret->priv = av_mallocz(filter->priv_size);
00702 if (!ret->priv)
00703 goto err;
00704 }
00705
00706 ret->input_count = pad_count(filter->inputs);
00707 if (ret->input_count) {
00708 ret->input_pads = av_malloc(sizeof(AVFilterPad) * ret->input_count);
00709 if (!ret->input_pads)
00710 goto err;
00711 memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->input_count);
00712 ret->inputs = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
00713 if (!ret->inputs)
00714 goto err;
00715 }
00716
00717 ret->output_count = pad_count(filter->outputs);
00718 if (ret->output_count) {
00719 ret->output_pads = av_malloc(sizeof(AVFilterPad) * ret->output_count);
00720 if (!ret->output_pads)
00721 goto err;
00722 memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->output_count);
00723 ret->outputs = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
00724 if (!ret->outputs)
00725 goto err;
00726 }
00727
00728 *filter_ctx = ret;
00729 return 0;
00730
00731 err:
00732 av_freep(&ret->inputs);
00733 av_freep(&ret->input_pads);
00734 ret->input_count = 0;
00735 av_freep(&ret->outputs);
00736 av_freep(&ret->output_pads);
00737 ret->output_count = 0;
00738 av_freep(&ret->priv);
00739 av_free(ret);
00740 return AVERROR(ENOMEM);
00741 }
00742
00743 void avfilter_free(AVFilterContext *filter)
00744 {
00745 int i;
00746 AVFilterLink *link;
00747
00748 if (filter->filter->uninit)
00749 filter->filter->uninit(filter);
00750
00751 for (i = 0; i < filter->input_count; i++) {
00752 if ((link = filter->inputs[i])) {
00753 if (link->src)
00754 link->src->outputs[link->srcpad - link->src->output_pads] = NULL;
00755 avfilter_formats_unref(&link->in_formats);
00756 avfilter_formats_unref(&link->out_formats);
00757 }
00758 avfilter_link_free(&link);
00759 }
00760 for (i = 0; i < filter->output_count; i++) {
00761 if ((link = filter->outputs[i])) {
00762 if (link->dst)
00763 link->dst->inputs[link->dstpad - link->dst->input_pads] = NULL;
00764 avfilter_formats_unref(&link->in_formats);
00765 avfilter_formats_unref(&link->out_formats);
00766 }
00767 avfilter_link_free(&link);
00768 }
00769
00770 av_freep(&filter->name);
00771 av_freep(&filter->input_pads);
00772 av_freep(&filter->output_pads);
00773 av_freep(&filter->inputs);
00774 av_freep(&filter->outputs);
00775 av_freep(&filter->priv);
00776 av_free(filter);
00777 }
00778
00779 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
00780 {
00781 int ret=0;
00782
00783 if (filter->filter->init)
00784 ret = filter->filter->init(filter, args, opaque);
00785 return ret;
00786 }
00787
