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ffmpeg/libavfilter/defaults.c

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/*
* Filter layer - default implementations
* Copyright (c) 2007 Bobby Bingham
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/audioconvert.h"
#include "libavutil/imgutils.h"
#include "libavutil/samplefmt.h"
#include "avfilter.h"
#include "internal.h"
void ff_avfilter_default_free_buffer(AVFilterBuffer *ptr)
{
av_free(ptr->data[0]);
av_free(ptr);
}
/* TODO: set the buffer's priv member to a context structure for the whole
* filter chain. This will allow for a buffer pool instead of the constant
* alloc & free cycle currently implemented. */
AVFilterBufferRef *avfilter_default_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
{
int linesize[4];
uint8_t *data[4];
int i;
AVFilterBufferRef *picref = NULL;
AVFilterPool *pool = link->pool;
if (pool) {
for (i = 0; i < POOL_SIZE; i++) {
picref = pool->pic[i];
if (picref && picref->buf->format == link->format && picref->buf->w == w && picref->buf->h == h) {
AVFilterBuffer *pic = picref->buf;
pool->pic[i] = NULL;
pool->count--;
picref->video->w = w;
picref->video->h = h;
picref->perms = perms | AV_PERM_READ;
picref->format = link->format;
pic->refcount = 1;
memcpy(picref->data, pic->data, sizeof(picref->data));
memcpy(picref->linesize, pic->linesize, sizeof(picref->linesize));
return picref;
}
}
} else
pool = link->pool = av_mallocz(sizeof(AVFilterPool));
// align: +2 is needed for swscaler, +16 to be SIMD-friendly
if ((i = av_image_alloc(data, linesize, w, h, link->format, 32)) < 0)
return NULL;
picref = avfilter_get_video_buffer_ref_from_arrays(data, linesize,
perms, w, h, link->format);
if (!picref) {
av_free(data[0]);
return NULL;
}
memset(data[0], 128, i);
picref->buf->priv = pool;
picref->buf->free = NULL;
return picref;
}
AVFilterBufferRef *avfilter_default_get_audio_buffer(AVFilterLink *link, int perms,
int nb_samples)
{
AVFilterBufferRef *samplesref = NULL;
int linesize[8];
uint8_t *data[8];
int nb_channels = av_get_channel_layout_nb_channels(link->channel_layout);
/* Calculate total buffer size, round to multiple of 16 to be SIMD friendly */
if (av_samples_alloc(data, linesize,
nb_channels, nb_samples, link->format,
16) < 0)
return NULL;
samplesref =
avfilter_get_audio_buffer_ref_from_arrays(data, linesize, perms,
nb_samples, link->format,
link->channel_layout, link->planar);
if (!samplesref) {
av_free(data[0]);
return NULL;
}
return samplesref;
}
void avfilter_default_start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
{
AVFilterLink *outlink = NULL;
if (inlink->dst->output_count)
outlink = inlink->dst->outputs[0];
if (outlink) {
outlink->out_buf = avfilter_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
avfilter_copy_buffer_ref_props(outlink->out_buf, picref);
avfilter_start_frame(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
}
}
void avfilter_default_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
{
AVFilterLink *outlink = NULL;
if (inlink->dst->output_count)
outlink = inlink->dst->outputs[0];
if (outlink)
avfilter_draw_slice(outlink, y, h, slice_dir);
}
void avfilter_default_end_frame(AVFilterLink *inlink)
{
AVFilterLink *outlink = NULL;
if (inlink->dst->output_count)
outlink = inlink->dst->outputs[0];
avfilter_unref_buffer(inlink->cur_buf);
inlink->cur_buf = NULL;
if (outlink) {
if (outlink->out_buf) {
avfilter_unref_buffer(outlink->out_buf);
outlink->out_buf = NULL;
}
avfilter_end_frame(outlink);
}
}
/* FIXME: samplesref is same as link->cur_buf. Need to consider removing the redundant parameter. */
void avfilter_default_filter_samples(AVFilterLink *inlink, AVFilterBufferRef *samplesref)
{
AVFilterLink *outlink = NULL;
if (inlink->dst->output_count)
outlink = inlink->dst->outputs[0];
if (outlink) {
outlink->out_buf = avfilter_default_get_audio_buffer(inlink, AV_PERM_WRITE,
samplesref->audio->nb_samples);
outlink->out_buf->pts = samplesref->pts;
outlink->out_buf->audio->sample_rate = samplesref->audio->sample_rate;
avfilter_filter_samples(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
avfilter_unref_buffer(outlink->out_buf);
outlink->out_buf = NULL;
}
avfilter_unref_buffer(samplesref);
inlink->cur_buf = NULL;
}
static void set_common_formats(AVFilterContext *ctx, AVFilterFormats *fmts,
enum AVMediaType type, int offin, int offout)
{
int i;
for (i = 0; i < ctx->input_count; i++)
if (ctx->inputs[i] && ctx->inputs[i]->type == type)
avfilter_formats_ref(fmts,
(AVFilterFormats **)((uint8_t *)ctx->inputs[i]+offout));
for (i = 0; i < ctx->output_count; i++)
if (ctx->outputs[i] && ctx->outputs[i]->type == type)
avfilter_formats_ref(fmts,
(AVFilterFormats **)((uint8_t *)ctx->outputs[i]+offin));
if (!fmts->refcount) {
av_free(fmts->formats);
av_free(fmts->refs);
av_free(fmts);
}
}
void avfilter_set_common_pixel_formats(AVFilterContext *ctx, AVFilterFormats *formats)
{
set_common_formats(ctx, formats, AVMEDIA_TYPE_VIDEO,
offsetof(AVFilterLink, in_formats),
offsetof(AVFilterLink, out_formats));
}
void avfilter_set_common_sample_formats(AVFilterContext *ctx, AVFilterFormats *formats)
{
set_common_formats(ctx, formats, AVMEDIA_TYPE_AUDIO,
offsetof(AVFilterLink, in_formats),
offsetof(AVFilterLink, out_formats));
}
void avfilter_set_common_channel_layouts(AVFilterContext *ctx, AVFilterFormats *formats)
{
set_common_formats(ctx, formats, AVMEDIA_TYPE_AUDIO,
offsetof(AVFilterLink, in_chlayouts),
offsetof(AVFilterLink, out_chlayouts));
}
void avfilter_set_common_packing_formats(AVFilterContext *ctx, AVFilterFormats *formats)
{
set_common_formats(ctx, formats, AVMEDIA_TYPE_AUDIO,
offsetof(AVFilterLink, in_packing),
offsetof(AVFilterLink, out_packing));
}
int avfilter_default_query_formats(AVFilterContext *ctx)
{
avfilter_set_common_pixel_formats(ctx, avfilter_make_all_formats(AVMEDIA_TYPE_VIDEO));
avfilter_set_common_sample_formats(ctx, avfilter_make_all_formats(AVMEDIA_TYPE_AUDIO));
avfilter_set_common_channel_layouts(ctx, avfilter_make_all_channel_layouts());
avfilter_set_common_packing_formats(ctx, avfilter_make_all_packing_formats());
return 0;
}
void avfilter_null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
{
avfilter_start_frame(link->dst->outputs[0], picref);
}
void avfilter_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
{
avfilter_draw_slice(link->dst->outputs[0], y, h, slice_dir);
}
void avfilter_null_end_frame(AVFilterLink *link)
{
avfilter_end_frame(link->dst->outputs[0]);
}
void avfilter_null_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
{
avfilter_filter_samples(link->dst->outputs[0], samplesref);
}
AVFilterBufferRef *avfilter_null_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
{
return avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h);
}
AVFilterBufferRef *avfilter_null_get_audio_buffer(AVFilterLink *link, int perms,
int nb_samples)
{
return avfilter_get_audio_buffer(link->dst->outputs[0], perms, nb_samples);
}
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