/* * filter layer * Copyright (c) 2007 Bobby Bingham * * This file is part of Libav. * * Libav is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * Libav is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /* #define DEBUG */ #include "libavutil/pixdesc.h" #include "libavutil/rational.h" #include "libavutil/audioconvert.h" #include "avfilter.h" #include "formats.h" #include "internal.h" unsigned avfilter_version(void) { return LIBAVFILTER_VERSION_INT; } const char *avfilter_configuration(void) { return LIBAV_CONFIGURATION; } const char *avfilter_license(void) { #define LICENSE_PREFIX "libavfilter license: " return LICENSE_PREFIX LIBAV_LICENSE + sizeof(LICENSE_PREFIX) - 1; } void ff_insert_pad(unsigned idx, unsigned *count, size_t padidx_off, AVFilterPad **pads, AVFilterLink ***links, AVFilterPad *newpad) { unsigned i; idx = FFMIN(idx, *count); *pads = av_realloc(*pads, sizeof(AVFilterPad) * (*count + 1)); *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1)); memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad) * (*count-idx)); memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx)); memcpy(*pads+idx, newpad, sizeof(AVFilterPad)); (*links)[idx] = NULL; (*count)++; for (i = idx+1; i < *count; i++) if (*links[i]) (*(unsigned *)((uint8_t *) *links[i] + padidx_off))++; } int avfilter_link(AVFilterContext *src, unsigned srcpad, AVFilterContext *dst, unsigned dstpad) { AVFilterLink *link; if (src->nb_outputs <= srcpad || dst->nb_inputs <= dstpad || src->outputs[srcpad] || dst->inputs[dstpad]) return -1; if (src->output_pads[srcpad].type != dst->input_pads[dstpad].type) { av_log(src, AV_LOG_ERROR, "Media type mismatch between the '%s' filter output pad %d and the '%s' filter input pad %d\n", src->name, srcpad, dst->name, dstpad); return AVERROR(EINVAL); } src->outputs[srcpad] = dst-> inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink)); link->src = src; link->dst = dst; link->srcpad = &src->output_pads[srcpad]; link->dstpad = &dst->input_pads[dstpad]; link->type = src->output_pads[srcpad].type; assert(PIX_FMT_NONE == -1 && AV_SAMPLE_FMT_NONE == -1); link->format = -1; return 0; } int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt, unsigned filt_srcpad_idx, unsigned filt_dstpad_idx) { int ret; unsigned dstpad_idx = link->dstpad - link->dst->input_pads; av_log(link->dst, AV_LOG_INFO, "auto-inserting filter '%s' " "between the filter '%s' and the filter '%s'\n", filt->name, link->src->name, link->dst->name); link->dst->inputs[dstpad_idx] = NULL; if ((ret = avfilter_link(filt, filt_dstpad_idx, link->dst, dstpad_idx)) < 0) { /* failed to link output filter to new filter */ link->dst->inputs[dstpad_idx] = link; return ret; } /* re-hookup the link to the new destination filter we inserted */ link->dst = filt; link->dstpad = &filt->input_pads[filt_srcpad_idx]; filt->inputs[filt_srcpad_idx] = link; /* if any information on supported media formats already exists on the * link, we need to preserve that */ if (link->out_formats) ff_formats_changeref(&link->out_formats, &filt->outputs[filt_dstpad_idx]->out_formats); if (link->out_samplerates) ff_formats_changeref(&link->out_samplerates, &filt->outputs[filt_dstpad_idx]->out_samplerates); if (link->out_channel_layouts) ff_channel_layouts_changeref(&link->out_channel_layouts, &filt->outputs[filt_dstpad_idx]->out_channel_layouts); return 0; } int avfilter_config_links(AVFilterContext *filter) { int (*config_link)(AVFilterLink *); unsigned i; int ret; for (i = 0; i < filter->nb_inputs; i ++) { AVFilterLink *link = filter->inputs[i]; if (!link) continue; switch (link->init_state) { case AVLINK_INIT: continue; case AVLINK_STARTINIT: av_log(filter, AV_LOG_INFO, "circular filter chain detected\n"); return 0; case AVLINK_UNINIT: link->init_state = AVLINK_STARTINIT; if ((ret = avfilter_config_links(link->src)) < 0) return ret; if (!(config_link = link->srcpad->config_props)) { if (link->src->nb_inputs != 1) { av_log(link->src, AV_LOG_ERROR, "Source filters and filters " "with more than one input " "must set config_props() " "callbacks on all outputs\n"); return AVERROR(EINVAL); } } else if ((ret = config_link(link)) < 0) { av_log(link->src, AV_LOG_ERROR, "Failed to configure output pad on %s\n", link->src->name); return ret; } if (link->time_base.num == 0 && link->time_base.den == 0) link->time_base = link->src && link->src->nb_inputs ? link->src->inputs[0]->time_base : AV_TIME_BASE_Q; if (link->type == AVMEDIA_TYPE_VIDEO) { if (!link->sample_aspect_ratio.num && !link->sample_aspect_ratio.den) link->sample_aspect_ratio = link->src->nb_inputs ? link->src->inputs[0]->sample_aspect_ratio : (AVRational){1,1}; if (link->src->nb_inputs) { if (!link->w) link->w = link->src->inputs[0]->w; if (!link->h) link->h = link->src->inputs[0]->h; } else if (!link->w || !link->h) { av_log(link->src, AV_LOG_ERROR, "Video source filters must set their output link's " "width and height\n"); return AVERROR(EINVAL); } } if ((config_link = link->dstpad->config_props)) if ((ret = config_link(link)) < 0) { av_log(link->src, AV_LOG_ERROR, "Failed to configure input pad on %s\n", link->dst->name); return ret; } link->init_state = AVLINK_INIT; } } return 0; } void ff_dlog_link(void *ctx, AVFilterLink *link, int end) { if (link->type == AVMEDIA_TYPE_VIDEO) { av_dlog(ctx, "link[%p s:%dx%d fmt:%-16s %-16s->%-16s]%s", link, link->w, link->h, av_pix_fmt_descriptors[link->format].name, link->src ? link->src->filter->name : "", link->dst ? link->dst->filter->name : "", end ? "\n" : ""); } else { char buf[128]; av_get_channel_layout_string(buf, sizeof(buf), -1, link->channel_layout); av_dlog(ctx, "link[%p r:%"PRId64" cl:%s fmt:%-16s %-16s->%-16s]%s", link, link->sample_rate, buf, av_get_sample_fmt_name(link->format), link->src ? link->src->filter->name : "", link->dst ? link->dst->filter->name : "", end ? "\n" : ""); } } int ff_request_frame(AVFilterLink *link) { FF_DPRINTF_START(NULL, request_frame); ff_dlog_link(NULL, link, 1); if (link->srcpad->request_frame) return link->srcpad->request_frame(link); else if (link->src->inputs[0]) return ff_request_frame(link->src->inputs[0]); else return -1; } int ff_poll_frame(AVFilterLink *link) { int i, min = INT_MAX; if (link->srcpad->poll_frame) return link->srcpad->poll_frame(link); for (i = 0; i < link->src->nb_inputs; i++) { int val; if (!link->src->inputs[i]) return -1; val = ff_poll_frame(link->src->inputs[i]); min = FFMIN(min, val); } return min; } #define MAX_REGISTERED_AVFILTERS_NB 64 static AVFilter *registered_avfilters[MAX_REGISTERED_AVFILTERS_NB + 1]; static int next_registered_avfilter_idx = 0; AVFilter *avfilter_get_by_name(const char *name) { int i; for (i = 0; registered_avfilters[i]; i++) if (!strcmp(registered_avfilters[i]->name, name)) return registered_avfilters[i]; return NULL; } int avfilter_register(AVFilter *filter) { if (next_registered_avfilter_idx == MAX_REGISTERED_AVFILTERS_NB) return -1; registered_avfilters[next_registered_avfilter_idx++] = filter; return 0; } AVFilter **av_filter_next(AVFilter **filter) { return filter ? ++filter : ®istered_avfilters[0]; } void avfilter_uninit(void) { memset(registered_avfilters, 0, sizeof(registered_avfilters)); next_registered_avfilter_idx = 0; } static int pad_count(const AVFilterPad *pads) { int count; for(count = 0; pads->name; count ++) pads ++; return count; } static const char *filter_name(void *p) { AVFilterContext *filter = p; return filter->filter->name; } static const AVClass avfilter_class = { "AVFilter", filter_name, NULL, LIBAVUTIL_VERSION_INT, }; int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name) { AVFilterContext *ret; *filter_ctx = NULL; if (!filter) return AVERROR(EINVAL); ret = av_mallocz(sizeof(AVFilterContext)); if (!ret) return AVERROR(ENOMEM); ret->av_class = &avfilter_class; ret->filter = filter; ret->name = inst_name ? av_strdup(inst_name) : NULL; if (filter->priv_size) { ret->priv = av_mallocz(filter->priv_size); if (!ret->priv) goto err; } ret->nb_inputs = pad_count(filter->inputs); if (ret->nb_inputs ) { ret->input_pads = av_malloc(sizeof(AVFilterPad) * ret->nb_inputs); if (!ret->input_pads) goto err; memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->nb_inputs); ret->inputs = av_mallocz(sizeof(AVFilterLink*) * ret->nb_inputs); if (!ret->inputs) goto err; } ret->nb_outputs = pad_count(filter->outputs); if (ret->nb_outputs) { ret->output_pads = av_malloc(sizeof(AVFilterPad) * ret->nb_outputs); if (!ret->output_pads) goto err; memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->nb_outputs); ret->outputs = av_mallocz(sizeof(AVFilterLink*) * ret->nb_outputs); if (!ret->outputs) goto err; } #if FF_API_FOO_COUNT ret->output_count = ret->nb_outputs; ret->input_count = ret->nb_inputs; #endif *filter_ctx = ret; return 0; err: av_freep(&ret->inputs); av_freep(&ret->input_pads); ret->nb_inputs = 0; av_freep(&ret->outputs); av_freep(&ret->output_pads); ret->nb_outputs = 0; av_freep(&ret->priv); av_free(ret); return AVERROR(ENOMEM); } void avfilter_free(AVFilterContext *filter) { int i; AVFilterLink *link; if (filter->filter->uninit) filter->filter->uninit(filter); for (i = 0; i < filter->nb_inputs; i++) { if ((link = filter->inputs[i])) { if (link->src) link->src->outputs[link->srcpad - link->src->output_pads] = NULL; ff_formats_unref(&link->in_formats); ff_formats_unref(&link->out_formats); ff_formats_unref(&link->in_samplerates); ff_formats_unref(&link->out_samplerates); ff_channel_layouts_unref(&link->in_channel_layouts); ff_channel_layouts_unref(&link->out_channel_layouts); } av_freep(&link); } for (i = 0; i < filter->nb_outputs; i++) { if ((link = filter->outputs[i])) { if (link->dst) link->dst->inputs[link->dstpad - link->dst->input_pads] = NULL; ff_formats_unref(&link->in_formats); ff_formats_unref(&link->out_formats); ff_formats_unref(&link->in_samplerates); ff_formats_unref(&link->out_samplerates); ff_channel_layouts_unref(&link->in_channel_layouts); ff_channel_layouts_unref(&link->out_channel_layouts); } av_freep(&link); } av_freep(&filter->name); av_freep(&filter->input_pads); av_freep(&filter->output_pads); av_freep(&filter->inputs); av_freep(&filter->outputs); av_freep(&filter->priv); av_free(filter); } int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque) { int ret=0; if (filter->filter->init) ret = filter->filter->init(filter, args); return ret; } const char *avfilter_pad_get_name(AVFilterPad *pads, int pad_idx) { return pads[pad_idx].name; } enum AVMediaType avfilter_pad_get_type(AVFilterPad *pads, int pad_idx) { return pads[pad_idx].type; }