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ffmpeg/libswscale/slice.c

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/*
* Copyright (C) 2015 Pedro Arthur <bygrandao@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 "libavutil/mem.h"
#include "swscale_internal.h"
static void free_lines(SwsSlice *s)
{
int i;
for (i = 0; i < 2; ++i) {
int n = s->plane[i].available_lines;
int j;
for (j = 0; j < n; ++j) {
av_freep(&s->plane[i].line[j]);
if (s->is_ring)
s->plane[i].line[j+n] = NULL;
}
}
for (i = 0; i < 4; ++i)
memset(s->plane[i].line, 0, sizeof(uint8_t*) * s->plane[i].available_lines * (s->is_ring ? 3 : 1));
s->should_free_lines = 0;
}
/*
slice lines contains extra bytes for vectorial code thus @size
is the allocated memory size and @width is the number of pixels
*/
static int alloc_lines(SwsSlice *s, int size, int width)
{
int i;
int idx[2] = {3, 2};
s->should_free_lines = 1;
s->width = width;
for (i = 0; i < 2; ++i) {
int n = s->plane[i].available_lines;
int j;
int ii = idx[i];
av_assert0(n == s->plane[ii].available_lines);
for (j = 0; j < n; ++j) {
// chroma plane line U and V are expected to be contiguous in memory
// by mmx vertical scaler code
s->plane[i].line[j] = av_malloc(size * 2 + 32);
if (!s->plane[i].line[j]) {
free_lines(s);
return AVERROR(ENOMEM);
}
s->plane[ii].line[j] = s->plane[i].line[j] + size + 16;
if (s->is_ring) {
s->plane[i].line[j+n] = s->plane[i].line[j];
s->plane[ii].line[j+n] = s->plane[ii].line[j];
}
}
}
return 0;
}
static int alloc_slice(SwsSlice *s, enum AVPixelFormat fmt, int lumLines, int chrLines, int h_sub_sample, int v_sub_sample, int ring)
{
int i;
int size[4] = { lumLines,
chrLines,
chrLines,
lumLines };
s->h_chr_sub_sample = h_sub_sample;
s->v_chr_sub_sample = v_sub_sample;
s->fmt = fmt;
s->is_ring = ring;
s->should_free_lines = 0;
for (i = 0; i < 4; ++i) {
int n = size[i] * ( ring == 0 ? 1 : 3);
s->plane[i].line = av_calloc(n, sizeof(*s->plane[i].line));
if (!s->plane[i].line)
return AVERROR(ENOMEM);
s->plane[i].tmp = ring ? s->plane[i].line + size[i] * 2 : NULL;
s->plane[i].available_lines = size[i];
s->plane[i].sliceY = 0;
s->plane[i].sliceH = 0;
}
return 0;
}
static void free_slice(SwsSlice *s)
{
int i;
if (s) {
if (s->should_free_lines)
free_lines(s);
for (i = 0; i < 4; ++i) {
av_freep(&s->plane[i].line);
s->plane[i].tmp = NULL;
}
}
}
int ff_rotate_slice(SwsSlice *s, int lum, int chr)
{
int i;
if (lum) {
for (i = 0; i < 4; i+=3) {
int n = s->plane[i].available_lines;
int l = lum - s->plane[i].sliceY;
if (l >= n * 2) {
s->plane[i].sliceY += n;
s->plane[i].sliceH -= n;
}
}
}
if (chr) {
for (i = 1; i < 3; ++i) {
int n = s->plane[i].available_lines;
int l = chr - s->plane[i].sliceY;
if (l >= n * 2) {
s->plane[i].sliceY += n;
s->plane[i].sliceH -= n;
}
}
}
return 0;
}
int ff_init_slice_from_src(SwsSlice * s, uint8_t *src[4], int stride[4], int srcW, int lumY, int lumH, int chrY, int chrH, int relative)
{
int i = 0;
const int start[4] = {lumY,
chrY,
chrY,
lumY};
const int end[4] = {lumY +lumH,
chrY + chrH,
chrY + chrH,
lumY + lumH};
s->width = srcW;
for (i = 0; i < 4 && src[i] != NULL; ++i) {
uint8_t *const src_i = src[i] + (relative ? 0 : start[i]) * stride[i];
int j;
int first = s->plane[i].sliceY;
int n = s->plane[i].available_lines;
int lines = end[i] - start[i];
int tot_lines = end[i] - first;
if (start[i] >= first && n >= tot_lines) {
s->plane[i].sliceH = FFMAX(tot_lines, s->plane[i].sliceH);
for (j = 0; j < lines; j+= 1)
s->plane[i].line[start[i] - first + j] = src_i + j * stride[i];
} else {
s->plane[i].sliceY = start[i];
lines = lines > n ? n : lines;
s->plane[i].sliceH = lines;
for (j = 0; j < lines; j+= 1)
s->plane[i].line[j] = src_i + j * stride[i];
}
}
return 0;
}
static void fill_ones(SwsSlice *s, int n, int bpc)
{
int i, j, k, size, end;
for (i = 0; i < 4; ++i) {
size = s->plane[i].available_lines;
for (j = 0; j < size; ++j) {
if (bpc == 16) {
end = (n>>1) + 1;
for (k = 0; k < end; ++k)
((int32_t*)(s->plane[i].line[j]))[k] = 1<<18;
} else if (bpc == 32) {
end = (n>>2) + 1;
for (k = 0; k < end; ++k)
((int64_t*)(s->plane[i].line[j]))[k] = 1LL<<34;
} else {
end = n + 1;
for (k = 0; k < end; ++k)
((int16_t*)(s->plane[i].line[j]))[k] = 1<<14;
}
}
}
}
/*
Calculates the minimum ring buffer size, it should be able to store vFilterSize
more n lines where n is the max difference between each adjacent slice which
outputs a line.
The n lines are needed only when there is not enough src lines to output a single
dst line, then we should buffer these lines to process them on the next call to scale.
*/
static void get_min_buffer_size(SwsContext *c, int *out_lum_size, int *out_chr_size)
{
int lumY;
int dstH = c->dstH;
int chrDstH = c->chrDstH;
int *lumFilterPos = c->vLumFilterPos;
int *chrFilterPos = c->vChrFilterPos;
int lumFilterSize = c->vLumFilterSize;
int chrFilterSize = c->vChrFilterSize;
int chrSubSample = c->chrSrcVSubSample;
*out_lum_size = lumFilterSize;
*out_chr_size = chrFilterSize;
for (lumY = 0; lumY < dstH; lumY++) {
int chrY = (int64_t)lumY * chrDstH / dstH;
int nextSlice = FFMAX(lumFilterPos[lumY] + lumFilterSize - 1,
((chrFilterPos[chrY] + chrFilterSize - 1)
<< chrSubSample));
nextSlice >>= chrSubSample;
nextSlice <<= chrSubSample;
(*out_lum_size) = FFMAX((*out_lum_size), nextSlice - lumFilterPos[lumY]);
(*out_chr_size) = FFMAX((*out_chr_size), (nextSlice >> chrSubSample) - chrFilterPos[chrY]);
}
}
int ff_init_filters(SwsContext * c)
{
int i;
int index;
int num_ydesc;
int num_cdesc;
int num_vdesc = isPlanarYUV(c->dstFormat) && !isGray(c->dstFormat) ? 2 : 1;
int need_lum_conv = c->lumToYV12 || c->readLumPlanar || c->alpToYV12 || c->readAlpPlanar;
int need_chr_conv = c->chrToYV12 || c->readChrPlanar;
int need_gamma = c->is_internal_gamma;
int srcIdx, dstIdx;
int dst_stride = FFALIGN(c->dstW * sizeof(int16_t) + 66, 16);
uint32_t * pal = usePal(c->srcFormat) ? c->pal_yuv : (uint32_t*)c->input_rgb2yuv_table;
int res = 0;
int lumBufSize;
int chrBufSize;
get_min_buffer_size(c, &lumBufSize, &chrBufSize);
lumBufSize = FFMAX(lumBufSize, c->vLumFilterSize + MAX_LINES_AHEAD);
chrBufSize = FFMAX(chrBufSize, c->vChrFilterSize + MAX_LINES_AHEAD);
if (c->dstBpc == 16)
dst_stride <<= 1;
if (c->dstBpc == 32)
dst_stride <<= 2;
num_ydesc = need_lum_conv ? 2 : 1;
num_cdesc = need_chr_conv ? 2 : 1;
c->numSlice = FFMAX(num_ydesc, num_cdesc) + 2;
c->numDesc = num_ydesc + num_cdesc + num_vdesc + (need_gamma ? 2 : 0);
c->descIndex[0] = num_ydesc + (need_gamma ? 1 : 0);
c->descIndex[1] = num_ydesc + num_cdesc + (need_gamma ? 1 : 0);
if (isFloat16(c->srcFormat)) {
c->h2f_tables = av_malloc(sizeof(*c->h2f_tables));
if (!c->h2f_tables)
return AVERROR(ENOMEM);
ff_init_half2float_tables(c->h2f_tables);
c->input_opaque = c->h2f_tables;
}
c->desc = av_calloc(c->numDesc, sizeof(*c->desc));
if (!c->desc)
return AVERROR(ENOMEM);
c->slice = av_calloc(c->numSlice, sizeof(*c->slice));
if (!c->slice) {
res = AVERROR(ENOMEM);
goto cleanup;
}
res = alloc_slice(&c->slice[0], c->srcFormat, c->srcH, c->chrSrcH, c->chrSrcHSubSample, c->chrSrcVSubSample, 0);
if (res < 0) goto cleanup;
for (i = 1; i < c->numSlice-2; ++i) {
res = alloc_slice(&c->slice[i], c->srcFormat, lumBufSize, chrBufSize, c->chrSrcHSubSample, c->chrSrcVSubSample, 0);
if (res < 0) goto cleanup;
res = alloc_lines(&c->slice[i], FFALIGN(c->srcW*2+78, 16), c->srcW);
if (res < 0) goto cleanup;
}
// horizontal scaler output
res = alloc_slice(&c->slice[i], c->srcFormat, lumBufSize, chrBufSize, c->chrDstHSubSample, c->chrDstVSubSample, 1);
if (res < 0) goto cleanup;
res = alloc_lines(&c->slice[i], dst_stride, c->dstW);
if (res < 0) goto cleanup;
fill_ones(&c->slice[i], dst_stride>>1, c->dstBpc);
// vertical scaler output
++i;
res = alloc_slice(&c->slice[i], c->dstFormat, c->dstH, c->chrDstH, c->chrDstHSubSample, c->chrDstVSubSample, 0);
if (res < 0) goto cleanup;
index = 0;
srcIdx = 0;
dstIdx = 1;
if (need_gamma) {
res = ff_init_gamma_convert(c->desc + index, c->slice + srcIdx, c->inv_gamma);
if (res < 0) goto cleanup;
++index;
}
if (need_lum_conv) {
res = ff_init_desc_fmt_convert(&c->desc[index], &c->slice[srcIdx], &c->slice[dstIdx], pal);
if (res < 0) goto cleanup;
c->desc[index].alpha = c->needAlpha;
++index;
srcIdx = dstIdx;
}
dstIdx = FFMAX(num_ydesc, num_cdesc);
res = ff_init_desc_hscale(&c->desc[index], &c->slice[srcIdx], &c->slice[dstIdx], c->hLumFilter, c->hLumFilterPos, c->hLumFilterSize, c->lumXInc);
if (res < 0) goto cleanup;
c->desc[index].alpha = c->needAlpha;
++index;
{
srcIdx = 0;
dstIdx = 1;
if (need_chr_conv) {
res = ff_init_desc_cfmt_convert(&c->desc[index], &c->slice[srcIdx], &c->slice[dstIdx], pal);
if (res < 0) goto cleanup;
++index;
srcIdx = dstIdx;
}
dstIdx = FFMAX(num_ydesc, num_cdesc);
if (c->needs_hcscale)
res = ff_init_desc_chscale(&c->desc[index], &c->slice[srcIdx], &c->slice[dstIdx], c->hChrFilter, c->hChrFilterPos, c->hChrFilterSize, c->chrXInc);
else
res = ff_init_desc_no_chr(&c->desc[index], &c->slice[srcIdx], &c->slice[dstIdx]);
if (res < 0) goto cleanup;
}
++index;
{
srcIdx = c->numSlice - 2;
dstIdx = c->numSlice - 1;
res = ff_init_vscale(c, c->desc + index, c->slice + srcIdx, c->slice + dstIdx);
if (res < 0) goto cleanup;
}
++index;
if (need_gamma) {
res = ff_init_gamma_convert(c->desc + index, c->slice + dstIdx, c->gamma);
if (res < 0) goto cleanup;
}
return 0;
cleanup:
ff_free_filters(c);
return res;
}
int ff_free_filters(SwsContext *c)
{
int i;
if (c->desc) {
for (i = 0; i < c->numDesc; ++i)
av_freep(&c->desc[i].instance);
av_freep(&c->desc);
}
if (c->slice) {
for (i = 0; i < c->numSlice; ++i)
free_slice(&c->slice[i]);
av_freep(&c->slice);
}
av_freep(&c->h2f_tables);
return 0;
}
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