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 "libavcore/imgutils.h"
#include "libavcodec/audioconvert.h"
#include "avfilter.h"
/* TODO: buffer pool. see comment for avfilter_default_get_video_buffer() */
static void 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)
{
AVFilterBuffer *pic = av_mallocz(sizeof(AVFilterBuffer));
AVFilterBufferRef *ref = NULL;
int i, tempsize;
char *buf = NULL;
if (!pic || !(ref = av_mallocz(sizeof(AVFilterBufferRef))))
goto fail;
ref->buf = pic;
ref->video = av_mallocz(sizeof(AVFilterBufferRefVideoProps));
ref->video->w = w;
ref->video->h = h;
/* make sure the buffer gets read permission or it's useless for output */
ref->perms = perms | AV_PERM_READ;
pic->refcount = 1;
ref->format = link->format;
pic->free = avfilter_default_free_buffer;
av_image_fill_linesizes(pic->linesize, ref->format, ref->video->w);
for (i = 0; i < 4; i++)
pic->linesize[i] = FFALIGN(pic->linesize[i], 16);
tempsize = av_image_fill_pointers(pic->data, ref->format, ref->video->h, NULL, pic->linesize);
buf = av_malloc(tempsize + 16); // +2 is needed for swscaler, +16 to be
// SIMD-friendly
if (!buf)
goto fail;
av_image_fill_pointers(pic->data, ref->format, ref->video->h, buf, pic->linesize);
memcpy(ref->data, pic->data, sizeof(ref->data));
memcpy(ref->linesize, pic->linesize, sizeof(ref->linesize));
return ref;
fail:
av_free(buf);
if (ref && ref->video)
av_free(ref->video);
av_free(ref);
av_free(pic);
return NULL;
}
AVFilterBufferRef *avfilter_default_get_audio_buffer(AVFilterLink *link, int perms,
enum SampleFormat sample_fmt, int size,
int64_t channel_layout, int planar)
{
AVFilterBuffer *samples = av_mallocz(sizeof(AVFilterBuffer));
AVFilterBufferRef *ref = NULL;
int i, sample_size, chans_nb, bufsize, per_channel_size, step_size = 0;
char *buf;
if (!samples || !(ref = av_mallocz(sizeof(AVFilterBufferRef))))
goto fail;
ref->buf = samples;
ref->format = sample_fmt;
ref->audio = av_mallocz(sizeof(AVFilterBufferRefAudioProps));
if (!ref->audio)
goto fail;
ref->audio->channel_layout = channel_layout;
ref->audio->size = size;
ref->audio->planar = planar;
/* make sure the buffer gets read permission or it's useless for output */
ref->perms = perms | AV_PERM_READ;
samples->refcount = 1;
samples->free = avfilter_default_free_buffer;
sample_size = av_get_bits_per_sample_format(sample_fmt) >>3;
chans_nb = avcodec_channel_layout_num_channels(channel_layout);
per_channel_size = size/chans_nb;
ref->audio->samples_nb = per_channel_size/sample_size;
/* Set the number of bytes to traverse to reach next sample of a particular channel:
* For planar, this is simply the sample size.
* For packed, this is the number of samples * sample_size.
*/
for (i = 0; i < chans_nb; i++)
samples->linesize[i] = planar > 0 ? per_channel_size : sample_size;
memset(&samples->linesize[chans_nb], 0, (8-chans_nb) * sizeof(samples->linesize[0]));
/* Calculate total buffer size, round to multiple of 16 to be SIMD friendly */
bufsize = (size + 15)&~15;
buf = av_malloc(bufsize);
if (!buf)
goto fail;
/* For planar, set the start point of each channel's data within the buffer
* For packed, set the start point of the entire buffer only
*/
samples->data[0] = buf;
if (buf && planar) {
for (i = 1; i < chans_nb; i++) {
step_size += per_channel_size;
samples->data[i] = buf + step_size;
}
} else {
for (i = 1; i < chans_nb; i++)
samples->data[i] = buf;
}
memset(&samples->data[chans_nb], 0, (8-chans_nb) * sizeof(samples->data[0]));
memcpy(ref->data, samples->data, sizeof(ref->data));
memcpy(ref->linesize, samples->linesize, sizeof(ref->linesize));
return ref;
fail:
av_free(buf);
if (ref && ref->audio)
av_free(ref->audio);
av_free(ref);
av_free(samples);
return NULL;
}
void avfilter_default_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
{
AVFilterLink *out = NULL;
if (link->dst->output_count)
out = link->dst->outputs[0];
if (out) {
out->out_buf = avfilter_get_video_buffer(out, AV_PERM_WRITE, out->w, out->h);
avfilter_copy_buffer_ref_props(out->out_buf, picref);
avfilter_start_frame(out, avfilter_ref_buffer(out->out_buf, ~0));
}
}
void avfilter_default_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
{
AVFilterLink *out = NULL;
if (link->dst->output_count)
out = link->dst->outputs[0];
if (out)
avfilter_draw_slice(out, y, h, slice_dir);
}
void avfilter_default_end_frame(AVFilterLink *link)
{
AVFilterLink *out = NULL;
if (link->dst->output_count)
out = link->dst->outputs[0];
avfilter_unref_buffer(link->cur_buf);
link->cur_buf = NULL;
if (out) {
if (out->out_buf) {
avfilter_unref_buffer(out->out_buf);
out->out_buf = NULL;
}
avfilter_end_frame(out);
}
}
/* FIXME: samplesref is same as link->cur_buf. Need to consider removing the redundant parameter. */
void avfilter_default_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
{
AVFilterLink *outlink = NULL;
if (link->dst->output_count)
outlink = link->dst->outputs[0];
if (outlink) {
outlink->out_buf = avfilter_default_get_audio_buffer(link, AV_PERM_WRITE, samplesref->format,
samplesref->audio->size,
samplesref->audio->channel_layout,
samplesref->audio->planar);
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);
link->cur_buf = NULL;
}
/**
* default config_link() implementation for output video links to simplify
* the implementation of one input one output video filters */
int avfilter_default_config_output_link(AVFilterLink *link)
{
if (link->src->input_count && link->src->inputs[0]) {
if (link->type == AVMEDIA_TYPE_VIDEO) {
link->w = link->src->inputs[0]->w;
link->h = link->src->inputs[0]->h;
} else if (link->type == AVMEDIA_TYPE_AUDIO) {
link->channel_layout = link->src->inputs[0]->channel_layout;
link->sample_rate = link->src->inputs[0]->sample_rate;
}
} else {
/* XXX: any non-simple filter which would cause this branch to be taken
* really should implement its own config_props() for this link. */
return -1;
}
return 0;
}
/**
* A helper for query_formats() which sets all links to the same list of
* formats. If there are no links hooked to this filter, the list of formats is
* freed.
*
* FIXME: this will need changed for filters with a mix of pad types
* (video + audio, etc)
*/
void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
{
int count = 0, i;
for (i = 0; i < ctx->input_count; i++) {
if (ctx->inputs[i]) {
avfilter_formats_ref(formats, &ctx->inputs[i]->out_formats);
count++;
}
}
for (i = 0; i < ctx->output_count; i++) {
if (ctx->outputs[i]) {
avfilter_formats_ref(formats, &ctx->outputs[i]->in_formats);
count++;
}
}
if (!count) {
av_free(formats->formats);
av_free(formats->refs);
av_free(formats);
}
}
int avfilter_default_query_formats(AVFilterContext *ctx)
{
enum AVMediaType type = ctx->inputs && ctx->inputs [0] ? ctx->inputs [0]->type :
ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
AVMEDIA_TYPE_VIDEO;
avfilter_set_common_formats(ctx, avfilter_all_formats(type));
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,
enum SampleFormat sample_fmt, int size,
int64_t channel_layout, int packed)
{
return avfilter_get_audio_buffer(link->dst->outputs[0], perms, sample_fmt,
size, channel_layout, packed);
}