mirror of https://git.ffmpeg.org/ffmpeg.git
251 lines
8.0 KiB
C
251 lines
8.0 KiB
C
/*
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* Filter layer - default implementations
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* Copyright (c) 2007 Bobby Bingham
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/audioconvert.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/samplefmt.h"
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#include "avfilter.h"
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#include "internal.h"
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/* TODO: buffer pool. see comment for avfilter_default_get_video_buffer() */
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void ff_avfilter_default_free_buffer(AVFilterBuffer *ptr)
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{
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if (ptr->extended_data != ptr->data)
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av_freep(&ptr->extended_data);
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av_free(ptr->data[0]);
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av_free(ptr);
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}
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/* TODO: set the buffer's priv member to a context structure for the whole
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* filter chain. This will allow for a buffer pool instead of the constant
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* alloc & free cycle currently implemented. */
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AVFilterBufferRef *avfilter_default_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
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{
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int linesize[4];
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uint8_t *data[4];
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AVFilterBufferRef *picref = NULL;
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// +2 is needed for swscaler, +16 to be SIMD-friendly
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if (av_image_alloc(data, linesize, w, h, link->format, 16) < 0)
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return NULL;
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picref = avfilter_get_video_buffer_ref_from_arrays(data, linesize,
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perms, w, h, link->format);
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if (!picref) {
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av_free(data[0]);
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return NULL;
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}
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return picref;
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}
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AVFilterBufferRef *avfilter_default_get_audio_buffer(AVFilterLink *link, int perms,
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int nb_samples)
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{
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AVFilterBufferRef *samplesref = NULL;
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uint8_t **data;
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int planar = av_sample_fmt_is_planar(link->format);
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int nb_channels = av_get_channel_layout_nb_channels(link->channel_layout);
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int planes = planar ? nb_channels : 1;
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int linesize;
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if (!(data = av_mallocz(sizeof(*data) * planes)))
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goto fail;
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if (av_samples_alloc(data, &linesize, nb_channels, nb_samples, link->format, 0) < 0)
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goto fail;
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samplesref = avfilter_get_audio_buffer_ref_from_arrays(data, linesize, perms,
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nb_samples, link->format,
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link->channel_layout);
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if (!samplesref)
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goto fail;
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av_freep(&data);
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fail:
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if (data)
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av_freep(&data[0]);
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av_freep(&data);
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return samplesref;
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}
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void avfilter_default_start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
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{
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AVFilterLink *outlink = NULL;
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if (inlink->dst->output_count)
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outlink = inlink->dst->outputs[0];
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if (outlink) {
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outlink->out_buf = avfilter_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
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avfilter_copy_buffer_ref_props(outlink->out_buf, picref);
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avfilter_start_frame(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
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}
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}
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void avfilter_default_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
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{
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AVFilterLink *outlink = NULL;
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if (inlink->dst->output_count)
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outlink = inlink->dst->outputs[0];
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if (outlink)
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avfilter_draw_slice(outlink, y, h, slice_dir);
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}
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void avfilter_default_end_frame(AVFilterLink *inlink)
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{
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AVFilterLink *outlink = NULL;
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if (inlink->dst->output_count)
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outlink = inlink->dst->outputs[0];
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avfilter_unref_buffer(inlink->cur_buf);
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inlink->cur_buf = NULL;
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if (outlink) {
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if (outlink->out_buf) {
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avfilter_unref_buffer(outlink->out_buf);
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outlink->out_buf = NULL;
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}
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avfilter_end_frame(outlink);
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}
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}
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/* FIXME: samplesref is same as link->cur_buf. Need to consider removing the redundant parameter. */
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void avfilter_default_filter_samples(AVFilterLink *inlink, AVFilterBufferRef *samplesref)
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{
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AVFilterLink *outlink = NULL;
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if (inlink->dst->output_count)
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outlink = inlink->dst->outputs[0];
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if (outlink) {
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outlink->out_buf = avfilter_default_get_audio_buffer(inlink, AV_PERM_WRITE,
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samplesref->audio->nb_samples);
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outlink->out_buf->pts = samplesref->pts;
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outlink->out_buf->audio->sample_rate = samplesref->audio->sample_rate;
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avfilter_filter_samples(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
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avfilter_unref_buffer(outlink->out_buf);
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outlink->out_buf = NULL;
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}
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avfilter_unref_buffer(samplesref);
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inlink->cur_buf = NULL;
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}
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/**
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* default config_link() implementation for output video links to simplify
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* the implementation of one input one output video filters */
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int avfilter_default_config_output_link(AVFilterLink *link)
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{
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if (link->src->input_count && link->src->inputs[0]) {
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if (link->type == AVMEDIA_TYPE_VIDEO) {
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link->w = link->src->inputs[0]->w;
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link->h = link->src->inputs[0]->h;
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link->time_base = link->src->inputs[0]->time_base;
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} else if (link->type == AVMEDIA_TYPE_AUDIO) {
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link->channel_layout = link->src->inputs[0]->channel_layout;
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link->sample_rate = link->src->inputs[0]->sample_rate;
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}
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} else {
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/* XXX: any non-simple filter which would cause this branch to be taken
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* really should implement its own config_props() for this link. */
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return -1;
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}
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return 0;
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}
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/**
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* A helper for query_formats() which sets all links to the same list of
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* formats. If there are no links hooked to this filter, the list of formats is
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* freed.
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*
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* FIXME: this will need changed for filters with a mix of pad types
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* (video + audio, etc)
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*/
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void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
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{
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int count = 0, i;
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for (i = 0; i < ctx->input_count; i++) {
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if (ctx->inputs[i]) {
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avfilter_formats_ref(formats, &ctx->inputs[i]->out_formats);
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count++;
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}
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}
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for (i = 0; i < ctx->output_count; i++) {
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if (ctx->outputs[i]) {
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avfilter_formats_ref(formats, &ctx->outputs[i]->in_formats);
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count++;
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}
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}
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if (!count) {
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av_free(formats->formats);
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av_free(formats->refs);
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av_free(formats);
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}
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}
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int avfilter_default_query_formats(AVFilterContext *ctx)
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{
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enum AVMediaType type = ctx->inputs && ctx->inputs [0] ? ctx->inputs [0]->type :
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ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
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AVMEDIA_TYPE_VIDEO;
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avfilter_set_common_formats(ctx, avfilter_all_formats(type));
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return 0;
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}
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void avfilter_null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
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{
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avfilter_start_frame(link->dst->outputs[0], picref);
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}
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void avfilter_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
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{
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avfilter_draw_slice(link->dst->outputs[0], y, h, slice_dir);
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}
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void avfilter_null_end_frame(AVFilterLink *link)
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{
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avfilter_end_frame(link->dst->outputs[0]);
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}
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void avfilter_null_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
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{
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avfilter_filter_samples(link->dst->outputs[0], samplesref);
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}
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AVFilterBufferRef *avfilter_null_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
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{
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return avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h);
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}
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AVFilterBufferRef *avfilter_null_get_audio_buffer(AVFilterLink *link, int perms,
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int nb_samples)
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{
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return avfilter_get_audio_buffer(link->dst->outputs[0], perms, nb_samples);
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}
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