mirror of
https://git.ffmpeg.org/ffmpeg.git
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295 lines
9.8 KiB
C
295 lines
9.8 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 FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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void ff_avfilter_default_free_buffer(AVFilterBuffer *ptr)
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{
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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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int i;
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AVFilterBufferRef *picref = NULL;
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AVFilterPool *pool = link->pool;
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if (pool) {
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for (i = 0; i < POOL_SIZE; i++) {
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picref = pool->pic[i];
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if (picref && picref->buf->format == link->format && picref->buf->w == w && picref->buf->h == h) {
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AVFilterBuffer *pic = picref->buf;
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pool->pic[i] = NULL;
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pool->count--;
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picref->video->w = w;
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picref->video->h = h;
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picref->perms = perms | AV_PERM_READ;
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picref->format = link->format;
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pic->refcount = 1;
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memcpy(picref->data, pic->data, sizeof(picref->data));
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memcpy(picref->linesize, pic->linesize, sizeof(picref->linesize));
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return picref;
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}
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}
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} else
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pool = link->pool = av_mallocz(sizeof(AVFilterPool));
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// align: +2 is needed for swscaler, +16 to be SIMD-friendly
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if ((i = 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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memset(data[0], 128, i);
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picref->buf->priv = pool;
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picref->buf->free = NULL;
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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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enum AVSampleFormat sample_fmt, int nb_samples,
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int64_t channel_layout, int planar)
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{
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AVFilterBuffer *samples = av_mallocz(sizeof(AVFilterBuffer));
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AVFilterBufferRef *ref = NULL;
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int nb_channels = av_get_channel_layout_nb_channels(channel_layout);
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if (!samples || !(ref = av_mallocz(sizeof(AVFilterBufferRef))))
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goto fail;
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ref->buf = samples;
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ref->format = sample_fmt;
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ref->audio = av_mallocz(sizeof(AVFilterBufferRefAudioProps));
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if (!ref->audio)
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goto fail;
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ref->audio->channel_layout = channel_layout;
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ref->audio->nb_samples = nb_samples;
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ref->audio->planar = planar;
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/* make sure the buffer gets read permission or it's useless for output */
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ref->perms = perms | AV_PERM_READ;
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samples->refcount = 1;
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samples->free = ff_avfilter_default_free_buffer;
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/* Calculate total buffer size, round to multiple of 16 to be SIMD friendly */
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if (av_samples_alloc(samples->data, samples->linesize,
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nb_channels, nb_samples, sample_fmt,
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planar, 16) < 0)
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goto fail;
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memcpy(ref->data, samples->data, sizeof(ref->data));
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memcpy(ref->linesize, samples->linesize, sizeof(ref->linesize));
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return ref;
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fail:
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if (ref)
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av_free(ref->audio);
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av_free(ref);
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av_free(samples);
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return NULL;
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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, samplesref->format,
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samplesref->audio->nb_samples,
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samplesref->audio->channel_layout,
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samplesref->audio->planar);
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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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enum AVSampleFormat sample_fmt, int size,
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int64_t channel_layout, int packed)
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{
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return avfilter_get_audio_buffer(link->dst->outputs[0], perms, sample_fmt,
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size, channel_layout, packed);
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}
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