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ffmpeg/libavfilter/video.c

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/*
* Copyright 2007 Bobby Bingham
* Copyright Stefano Sabatini <stefasab gmail com>
* Copyright Vitor Sessak <vitor1001 gmail com>
*
* 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 <string.h>
#include <stdio.h>
#include "libavutil/avassert.h"
#include "libavutil/imgutils.h"
#include "libavutil/mem.h"
#include "avfilter.h"
#include "internal.h"
#include "video.h"
AVFilterBufferRef *ff_null_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
{
return ff_get_video_buffer(link->dst->outputs[0], perms, w, h);
}
AVFilterBufferRef *ff_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;
int full_perms = AV_PERM_READ | AV_PERM_WRITE | AV_PERM_PRESERVE |
AV_PERM_REUSE | AV_PERM_REUSE2 | AV_PERM_ALIGN;
av_assert1(!(perms & ~(full_perms | AV_PERM_NEG_LINESIZES)));
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--;
av_assert0(!picref->video->qp_table);
picref->video->w = w;
picref->video->h = h;
picref->perms = full_perms;
picref->format = link->format;
pic->refcount = 1;
memcpy(picref->data, pic->data, sizeof(picref->data));
memcpy(picref->linesize, pic->linesize, sizeof(picref->linesize));
pool->refcount++;
return picref;
}
}
} else {
pool = link->pool = av_mallocz(sizeof(AVFilterPool));
pool->refcount = 1;
}
// 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,
full_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;
pool->refcount++;
return picref;
}
AVFilterBufferRef *
avfilter_get_video_buffer_ref_from_arrays(uint8_t * const data[4], const int linesize[4], int perms,
int w, int h, enum AVPixelFormat format)
{
AVFilterBuffer *pic = av_mallocz(sizeof(AVFilterBuffer));
AVFilterBufferRef *picref = av_mallocz(sizeof(AVFilterBufferRef));
if (!pic || !picref)
goto fail;
picref->buf = pic;
picref->buf->free = ff_avfilter_default_free_buffer;
if (!(picref->video = av_mallocz(sizeof(AVFilterBufferRefVideoProps))))
goto fail;
pic->w = picref->video->w = w;
pic->h = picref->video->h = h;
/* make sure the buffer gets read permission or it's useless for output */
picref->perms = perms | AV_PERM_READ;
pic->refcount = 1;
picref->type = AVMEDIA_TYPE_VIDEO;
pic->format = picref->format = format;
memcpy(pic->data, data, 4*sizeof(data[0]));
memcpy(pic->linesize, linesize, 4*sizeof(linesize[0]));
memcpy(picref->data, pic->data, sizeof(picref->data));
memcpy(picref->linesize, pic->linesize, sizeof(picref->linesize));
pic-> extended_data = pic->data;
picref->extended_data = picref->data;
picref->pts = AV_NOPTS_VALUE;
return picref;
fail:
if (picref && picref->video)
av_free(picref->video);
av_free(picref);
av_free(pic);
return NULL;
}
AVFilterBufferRef *ff_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
{
AVFilterBufferRef *ret = NULL;
av_unused char buf[16];
FF_TPRINTF_START(NULL, get_video_buffer); ff_tlog_link(NULL, link, 0);
ff_tlog(NULL, " perms:%s w:%d h:%d\n", ff_get_ref_perms_string(buf, sizeof(buf), perms), w, h);
if (link->dstpad->get_video_buffer)
ret = link->dstpad->get_video_buffer(link, perms, w, h);
if (!ret)
ret = ff_default_get_video_buffer(link, perms, w, h);
if (ret)
ret->type = AVMEDIA_TYPE_VIDEO;
FF_TPRINTF_START(NULL, get_video_buffer); ff_tlog_link(NULL, link, 0); ff_tlog(NULL, " returning "); ff_tlog_ref(NULL, ret, 1);
return ret;
}
int ff_null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
{
AVFilterBufferRef *buf_out = avfilter_ref_buffer(picref, ~0);
if (!buf_out)
return AVERROR(ENOMEM);
return ff_start_frame(link->dst->outputs[0], buf_out);
}
// for filters that support (but don't require) outpic==inpic
int ff_inplace_start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
{
AVFilterLink *outlink = inlink->dst->outputs[0];
AVFilterBufferRef *outpicref = NULL, *for_next_filter;
int ret = 0;
if (inpicref->perms & AV_PERM_WRITE) {
outpicref = avfilter_ref_buffer(inpicref, ~0);
if (!outpicref)
return AVERROR(ENOMEM);
} else {
outpicref = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
if (!outpicref)
return AVERROR(ENOMEM);
avfilter_copy_buffer_ref_props(outpicref, inpicref);
outpicref->video->w = outlink->w;
outpicref->video->h = outlink->h;
}
for_next_filter = avfilter_ref_buffer(outpicref, ~0);
if (for_next_filter)
ret = ff_start_frame(outlink, for_next_filter);
else
ret = AVERROR(ENOMEM);
if (ret < 0) {
avfilter_unref_bufferp(&outpicref);
return ret;
}
outlink->out_buf = outpicref;
return 0;
}
static int default_start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
{
AVFilterLink *outlink = NULL;
if (inlink->dst->nb_outputs)
outlink = inlink->dst->outputs[0];
if (outlink && (inlink->dstpad->start_frame || inlink->dstpad->end_frame || inlink->dstpad->draw_slice)) {
AVFilterBufferRef *buf_out;
outlink->out_buf = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
if (!outlink->out_buf)
return AVERROR(ENOMEM);
avfilter_copy_buffer_ref_props(outlink->out_buf, picref);
outlink->out_buf->video->w = outlink->w;
outlink->out_buf->video->h = outlink->h;
buf_out = avfilter_ref_buffer(outlink->out_buf, ~0);
if (!buf_out)
return AVERROR(ENOMEM);
return ff_start_frame(outlink, buf_out);
}
return 0;
}
static void clear_link(AVFilterLink *link)
{
avfilter_unref_bufferp(&link->cur_buf);
avfilter_unref_bufferp(&link->src_buf);
avfilter_unref_bufferp(&link->out_buf);
link->cur_buf_copy = NULL; /* we do not own the reference */
}
/* XXX: should we do the duplicating of the picture ref here, instead of
* forcing the source filter to do it? */
int ff_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
{
int (*start_frame)(AVFilterLink *, AVFilterBufferRef *);
AVFilterPad *src = link->srcpad;
AVFilterPad *dst = link->dstpad;
int ret, perms;
AVFilterCommand *cmd= link->dst->command_queue;
int64_t pts;
FF_TPRINTF_START(NULL, start_frame); ff_tlog_link(NULL, link, 0); ff_tlog(NULL, " "); ff_tlog_ref(NULL, picref, 1);
if (strcmp(link->dst->filter->name, "scale")) {
av_assert1(picref->format == link->format);
av_assert1(picref->video->w == link->w);
av_assert1(picref->video->h == link->h);
}
if (link->closed) {
avfilter_unref_buffer(picref);
return AVERROR_EOF;
}
if (!(start_frame = dst->start_frame))
start_frame = default_start_frame;
av_assert1((picref->perms & src->min_perms) == src->min_perms);
picref->perms &= ~ src->rej_perms;
perms = picref->perms;
if (picref->linesize[0] < 0)
perms |= AV_PERM_NEG_LINESIZES;
/* prepare to copy the picture if it has insufficient permissions */
if ((dst->min_perms & perms) != dst->min_perms || dst->rej_perms & perms) {
av_log(link->dst, AV_LOG_DEBUG,
"frame copy needed (have perms %x, need %x, reject %x)\n",
picref->perms,
link->dstpad->min_perms, link->dstpad->rej_perms);
link->cur_buf = ff_get_video_buffer(link, dst->min_perms, link->w, link->h);
if (!link->cur_buf) {
avfilter_unref_bufferp(&picref);
return AVERROR(ENOMEM);
}
link->src_buf = picref;
avfilter_copy_buffer_ref_props(link->cur_buf, link->src_buf);
/* copy palette if required */
if (av_pix_fmt_desc_get(link->format)->flags & PIX_FMT_PAL)
memcpy(link->cur_buf->data[1], link->src_buf-> data[1], AVPALETTE_SIZE);
}
else
link->cur_buf = picref;
link->cur_buf_copy = link->cur_buf;
while(cmd && cmd->time <= picref->pts * av_q2d(link->time_base)){
av_log(link->dst, AV_LOG_DEBUG,
"Processing command time:%f command:%s arg:%s\n",
cmd->time, cmd->command, cmd->arg);
avfilter_process_command(link->dst, cmd->command, cmd->arg, 0, 0, cmd->flags);
ff_command_queue_pop(link->dst);
cmd= link->dst->command_queue;
}
pts = link->cur_buf->pts;
ret = start_frame(link, link->cur_buf);
ff_update_link_current_pts(link, pts);
if (ret < 0)
clear_link(link);
else
/* incoming buffers must not be freed in start frame,
because they can still be in use by the automatic copy mechanism */
av_assert1(link->cur_buf_copy->buf->refcount > 0);
return ret;
}
int ff_null_end_frame(AVFilterLink *link)
{
return ff_end_frame(link->dst->outputs[0]);
}
static int default_end_frame(AVFilterLink *inlink)
{
AVFilterLink *outlink = NULL;
if (inlink->dst->nb_outputs)
outlink = inlink->dst->outputs[0];
if (outlink) {
if (inlink->dstpad->filter_frame) {
int ret = inlink->dstpad->filter_frame(inlink, inlink->cur_buf);
inlink->cur_buf = NULL;
return ret;
} else if (inlink->dstpad->start_frame || inlink->dstpad->end_frame || inlink->dstpad->draw_slice){
return ff_end_frame(outlink);
} else {
int ret = ff_filter_frame(outlink, inlink->cur_buf);
inlink->cur_buf = NULL;
return ret;
}
}
return 0;
}
int ff_end_frame(AVFilterLink *link)
{
int (*end_frame)(AVFilterLink *);
int ret;
if (!(end_frame = link->dstpad->end_frame))
end_frame = default_end_frame;
ret = end_frame(link);
clear_link(link);
return ret;
}
int ff_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
{
return ff_draw_slice(link->dst->outputs[0], y, h, slice_dir);
}
static int default_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
{
AVFilterLink *outlink = NULL;
if (inlink->dst->nb_outputs)
outlink = inlink->dst->outputs[0];
if (outlink && (inlink->dstpad->start_frame || inlink->dstpad->end_frame || inlink->dstpad->draw_slice))
return ff_draw_slice(outlink, y, h, slice_dir);
return 0;
}
int ff_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
{
uint8_t *src[4], *dst[4];
int i, j, vsub, ret;
int (*draw_slice)(AVFilterLink *, int, int, int);
FF_TPRINTF_START(NULL, draw_slice); ff_tlog_link(NULL, link, 0); ff_tlog(NULL, " y:%d h:%d dir:%d\n", y, h, slice_dir);
/* copy the slice if needed for permission reasons */
if (link->src_buf) {
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
vsub = desc->log2_chroma_h;
for (i = 0; i < 4; i++) {
if (link->src_buf->data[i]) {
src[i] = link->src_buf-> data[i] +
(y >> (i==1 || i==2 ? vsub : 0)) * link->src_buf-> linesize[i];
dst[i] = link->cur_buf_copy->data[i] +
(y >> (i==1 || i==2 ? vsub : 0)) * link->cur_buf_copy->linesize[i];
} else
src[i] = dst[i] = NULL;
}
for (i = 0; i < 4; i++) {
int planew =
av_image_get_linesize(link->format, link->cur_buf_copy->video->w, i);
if (!src[i]) continue;
for (j = 0; j < h >> (i==1 || i==2 ? vsub : 0); j++) {
memcpy(dst[i], src[i], planew);
src[i] += link->src_buf->linesize[i];
dst[i] += link->cur_buf_copy->linesize[i];
}
}
}
if (!(draw_slice = link->dstpad->draw_slice))
draw_slice = default_draw_slice;
ret = draw_slice(link, y, h, slice_dir);
if (ret < 0)
clear_link(link);
else
/* incoming buffers must not be freed in start frame,
because they can still be in use by the automatic copy mechanism */
av_assert1(link->cur_buf_copy->buf->refcount > 0);
return ret;
}
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