mirror of
https://github.com/FFmpeg/FFmpeg.git
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9899037dc6
A function name should tell what the function does rather than what the function returns. This also avoids possible conflicts (e.g. between a function and a public list of all supported formats), and clarifies the code. Breaks audio API/ABI, add a backward compatibility layer for video API/ABI.
264 lines
8.9 KiB
C
264 lines
8.9 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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int nb_samples)
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{
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AVFilterBufferRef *samplesref = NULL;
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int linesize[8];
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uint8_t *data[8];
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int nb_channels = av_get_channel_layout_nb_channels(link->channel_layout);
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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(data, linesize,
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nb_channels, nb_samples, link->format,
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link->planar, 16) < 0)
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return NULL;
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samplesref =
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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, link->planar);
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if (!samplesref) {
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av_free(data[0]);
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return NULL;
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}
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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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static void set_common_formats(AVFilterContext *ctx, AVFilterFormats *fmts,
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enum AVMediaType type, int offin, int offout)
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{
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int i;
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for (i = 0; i < ctx->input_count; i++)
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if (ctx->inputs[i] && ctx->inputs[i]->type == type)
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avfilter_formats_ref(fmts,
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(AVFilterFormats **)((uint8_t *)ctx->inputs[i]+offout));
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for (i = 0; i < ctx->output_count; i++)
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if (ctx->outputs[i] && ctx->outputs[i]->type == type)
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avfilter_formats_ref(fmts,
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(AVFilterFormats **)((uint8_t *)ctx->outputs[i]+offin));
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if (!fmts->refcount) {
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av_free(fmts->formats);
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av_free(fmts->refs);
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av_free(fmts);
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}
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}
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void avfilter_set_common_pixel_formats(AVFilterContext *ctx, AVFilterFormats *formats)
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{
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set_common_formats(ctx, formats, AVMEDIA_TYPE_VIDEO,
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offsetof(AVFilterLink, in_formats),
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offsetof(AVFilterLink, out_formats));
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}
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void avfilter_set_common_sample_formats(AVFilterContext *ctx, AVFilterFormats *formats)
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{
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set_common_formats(ctx, formats, AVMEDIA_TYPE_AUDIO,
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offsetof(AVFilterLink, in_formats),
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offsetof(AVFilterLink, out_formats));
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}
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void avfilter_set_common_channel_layouts(AVFilterContext *ctx, AVFilterFormats *formats)
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{
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set_common_formats(ctx, formats, AVMEDIA_TYPE_AUDIO,
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offsetof(AVFilterLink, in_chlayouts),
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offsetof(AVFilterLink, out_chlayouts));
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}
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void avfilter_set_common_packing_formats(AVFilterContext *ctx, AVFilterFormats *formats)
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{
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set_common_formats(ctx, formats, AVMEDIA_TYPE_AUDIO,
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offsetof(AVFilterLink, in_packing),
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offsetof(AVFilterLink, out_packing));
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}
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int avfilter_default_query_formats(AVFilterContext *ctx)
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{
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avfilter_set_common_pixel_formats(ctx, avfilter_make_all_formats(AVMEDIA_TYPE_VIDEO));
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avfilter_set_common_sample_formats(ctx, avfilter_make_all_formats(AVMEDIA_TYPE_AUDIO));
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avfilter_set_common_channel_layouts(ctx, avfilter_make_all_channel_layouts());
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avfilter_set_common_packing_formats(ctx, avfilter_make_all_packing_formats());
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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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