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Diffstat (limited to 'media/ffvpx/libavutil/imgutils.c')
| -rw-r--r-- | media/ffvpx/libavutil/imgutils.c | 425 |
1 files changed, 425 insertions, 0 deletions
diff --git a/media/ffvpx/libavutil/imgutils.c b/media/ffvpx/libavutil/imgutils.c new file mode 100644 index 000000000..37808e53d --- /dev/null +++ b/media/ffvpx/libavutil/imgutils.c @@ -0,0 +1,425 @@ +/* + * 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 + */ + +/** + * @file + * misc image utilities + */ + +#include "avassert.h" +#include "common.h" +#include "imgutils.h" +#include "internal.h" +#include "intreadwrite.h" +#include "log.h" +#include "mathematics.h" +#include "pixdesc.h" +#include "rational.h" + +void av_image_fill_max_pixsteps(int max_pixsteps[4], int max_pixstep_comps[4], + const AVPixFmtDescriptor *pixdesc) +{ + int i; + memset(max_pixsteps, 0, 4*sizeof(max_pixsteps[0])); + if (max_pixstep_comps) + memset(max_pixstep_comps, 0, 4*sizeof(max_pixstep_comps[0])); + + for (i = 0; i < 4; i++) { + const AVComponentDescriptor *comp = &(pixdesc->comp[i]); + if (comp->step > max_pixsteps[comp->plane]) { + max_pixsteps[comp->plane] = comp->step; + if (max_pixstep_comps) + max_pixstep_comps[comp->plane] = i; + } + } +} + +static inline +int image_get_linesize(int width, int plane, + int max_step, int max_step_comp, + const AVPixFmtDescriptor *desc) +{ + int s, shifted_w, linesize; + + if (!desc) + return AVERROR(EINVAL); + + if (width < 0) + return AVERROR(EINVAL); + s = (max_step_comp == 1 || max_step_comp == 2) ? desc->log2_chroma_w : 0; + shifted_w = ((width + (1 << s) - 1)) >> s; + if (shifted_w && max_step > INT_MAX / shifted_w) + return AVERROR(EINVAL); + linesize = max_step * shifted_w; + + if (desc->flags & AV_PIX_FMT_FLAG_BITSTREAM) + linesize = (linesize + 7) >> 3; + return linesize; +} + +int av_image_get_linesize(enum AVPixelFormat pix_fmt, int width, int plane) +{ + const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt); + int max_step [4]; /* max pixel step for each plane */ + int max_step_comp[4]; /* the component for each plane which has the max pixel step */ + + if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL) + return AVERROR(EINVAL); + + av_image_fill_max_pixsteps(max_step, max_step_comp, desc); + return image_get_linesize(width, plane, max_step[plane], max_step_comp[plane], desc); +} + +int av_image_fill_linesizes(int linesizes[4], enum AVPixelFormat pix_fmt, int width) +{ + int i, ret; + const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt); + int max_step [4]; /* max pixel step for each plane */ + int max_step_comp[4]; /* the component for each plane which has the max pixel step */ + + memset(linesizes, 0, 4*sizeof(linesizes[0])); + + if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL) + return AVERROR(EINVAL); + + av_image_fill_max_pixsteps(max_step, max_step_comp, desc); + for (i = 0; i < 4; i++) { + if ((ret = image_get_linesize(width, i, max_step[i], max_step_comp[i], desc)) < 0) + return ret; + linesizes[i] = ret; + } + + return 0; +} + +int av_image_fill_pointers(uint8_t *data[4], enum AVPixelFormat pix_fmt, int height, + uint8_t *ptr, const int linesizes[4]) +{ + int i, total_size, size[4] = { 0 }, has_plane[4] = { 0 }; + + const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt); + memset(data , 0, sizeof(data[0])*4); + + if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL) + return AVERROR(EINVAL); + + data[0] = ptr; + if (linesizes[0] > (INT_MAX - 1024) / height) + return AVERROR(EINVAL); + size[0] = linesizes[0] * height; + + if (desc->flags & AV_PIX_FMT_FLAG_PAL || + desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL) { + data[1] = ptr + size[0]; /* palette is stored here as 256 32 bits words */ + return size[0] + 256 * 4; + } + + for (i = 0; i < 4; i++) + has_plane[desc->comp[i].plane] = 1; + + total_size = size[0]; + for (i = 1; i < 4 && has_plane[i]; i++) { + int h, s = (i == 1 || i == 2) ? desc->log2_chroma_h : 0; + data[i] = data[i-1] + size[i-1]; + h = (height + (1 << s) - 1) >> s; + if (linesizes[i] > INT_MAX / h) + return AVERROR(EINVAL); + size[i] = h * linesizes[i]; + if (total_size > INT_MAX - size[i]) + return AVERROR(EINVAL); + total_size += size[i]; + } + + return total_size; +} + +int avpriv_set_systematic_pal2(uint32_t pal[256], enum AVPixelFormat pix_fmt) +{ + int i; + + for (i = 0; i < 256; i++) { + int r, g, b; + + switch (pix_fmt) { + case AV_PIX_FMT_RGB8: + r = (i>>5 )*36; + g = ((i>>2)&7)*36; + b = (i&3 )*85; + break; + case AV_PIX_FMT_BGR8: + b = (i>>6 )*85; + g = ((i>>3)&7)*36; + r = (i&7 )*36; + break; + case AV_PIX_FMT_RGB4_BYTE: + r = (i>>3 )*255; + g = ((i>>1)&3)*85; + b = (i&1 )*255; + break; + case AV_PIX_FMT_BGR4_BYTE: + b = (i>>3 )*255; + g = ((i>>1)&3)*85; + r = (i&1 )*255; + break; + case AV_PIX_FMT_GRAY8: + r = b = g = i; + break; + default: + return AVERROR(EINVAL); + } + pal[i] = b + (g << 8) + (r << 16) + (0xFFU << 24); + } + + return 0; +} + +int av_image_alloc(uint8_t *pointers[4], int linesizes[4], + int w, int h, enum AVPixelFormat pix_fmt, int align) +{ + const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt); + int i, ret; + uint8_t *buf; + + if (!desc) + return AVERROR(EINVAL); + + if ((ret = av_image_check_size(w, h, 0, NULL)) < 0) + return ret; + if ((ret = av_image_fill_linesizes(linesizes, pix_fmt, align>7 ? FFALIGN(w, 8) : w)) < 0) + return ret; + + for (i = 0; i < 4; i++) + linesizes[i] = FFALIGN(linesizes[i], align); + + if ((ret = av_image_fill_pointers(pointers, pix_fmt, h, NULL, linesizes)) < 0) + return ret; + buf = av_malloc(ret + align); + if (!buf) + return AVERROR(ENOMEM); + if ((ret = av_image_fill_pointers(pointers, pix_fmt, h, buf, linesizes)) < 0) { + av_free(buf); + return ret; + } + if (desc->flags & AV_PIX_FMT_FLAG_PAL || desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL) { + avpriv_set_systematic_pal2((uint32_t*)pointers[1], pix_fmt); + if (align < 4) { + av_log(NULL, AV_LOG_ERROR, "Formats with a palette require a minimum alignment of 4\n"); + return AVERROR(EINVAL); + } + } + + if ((desc->flags & AV_PIX_FMT_FLAG_PAL || + desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL) && + pointers[1] - pointers[0] > linesizes[0] * h) { + /* zero-initialize the padding before the palette */ + memset(pointers[0] + linesizes[0] * h, 0, + pointers[1] - pointers[0] - linesizes[0] * h); + } + + return ret; +} + +typedef struct ImgUtils { + const AVClass *class; + int log_offset; + void *log_ctx; +} ImgUtils; + +static const AVClass imgutils_class = { + .class_name = "IMGUTILS", + .item_name = av_default_item_name, + .version = LIBAVUTIL_VERSION_INT, + .log_level_offset_offset = offsetof(ImgUtils, log_offset), + .parent_log_context_offset = offsetof(ImgUtils, log_ctx), +}; + +int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx) +{ + ImgUtils imgutils = { + .class = &imgutils_class, + .log_offset = log_offset, + .log_ctx = log_ctx, + }; + + if ((int)w>0 && (int)h>0 && (w+128)*(uint64_t)(h+128) < INT_MAX/8) + return 0; + + av_log(&imgutils, AV_LOG_ERROR, "Picture size %ux%u is invalid\n", w, h); + return AVERROR(EINVAL); +} + +int av_image_check_sar(unsigned int w, unsigned int h, AVRational sar) +{ + int64_t scaled_dim; + + if (sar.den <= 0 || sar.num < 0) + return AVERROR(EINVAL); + + if (!sar.num || sar.num == sar.den) + return 0; + + if (sar.num < sar.den) + scaled_dim = av_rescale_rnd(w, sar.num, sar.den, AV_ROUND_ZERO); + else + scaled_dim = av_rescale_rnd(h, sar.den, sar.num, AV_ROUND_ZERO); + + if (scaled_dim > 0) + return 0; + + return AVERROR(EINVAL); +} + +void av_image_copy_plane(uint8_t *dst, int dst_linesize, + const uint8_t *src, int src_linesize, + int bytewidth, int height) +{ + if (!dst || !src) + return; + av_assert0(abs(src_linesize) >= bytewidth); + av_assert0(abs(dst_linesize) >= bytewidth); + for (;height > 0; height--) { + memcpy(dst, src, bytewidth); + dst += dst_linesize; + src += src_linesize; + } +} + +void av_image_copy(uint8_t *dst_data[4], int dst_linesizes[4], + const uint8_t *src_data[4], const int src_linesizes[4], + enum AVPixelFormat pix_fmt, int width, int height) +{ + const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt); + + if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL) + return; + + if (desc->flags & AV_PIX_FMT_FLAG_PAL || + desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL) { + av_image_copy_plane(dst_data[0], dst_linesizes[0], + src_data[0], src_linesizes[0], + width, height); + /* copy the palette */ + memcpy(dst_data[1], src_data[1], 4*256); + } else { + int i, planes_nb = 0; + + for (i = 0; i < desc->nb_components; i++) + planes_nb = FFMAX(planes_nb, desc->comp[i].plane + 1); + + for (i = 0; i < planes_nb; i++) { + int h = height; + int bwidth = av_image_get_linesize(pix_fmt, width, i); + if (bwidth < 0) { + av_log(NULL, AV_LOG_ERROR, "av_image_get_linesize failed\n"); + return; + } + if (i == 1 || i == 2) { + h = AV_CEIL_RSHIFT(height, desc->log2_chroma_h); + } + av_image_copy_plane(dst_data[i], dst_linesizes[i], + src_data[i], src_linesizes[i], + bwidth, h); + } + } +} + +int av_image_fill_arrays(uint8_t *dst_data[4], int dst_linesize[4], + const uint8_t *src, enum AVPixelFormat pix_fmt, + int width, int height, int align) +{ + int ret, i; + + ret = av_image_check_size(width, height, 0, NULL); + if (ret < 0) + return ret; + + ret = av_image_fill_linesizes(dst_linesize, pix_fmt, width); + if (ret < 0) + return ret; + + for (i = 0; i < 4; i++) + dst_linesize[i] = FFALIGN(dst_linesize[i], align); + + return av_image_fill_pointers(dst_data, pix_fmt, height, (uint8_t *)src, dst_linesize); +} + +int av_image_get_buffer_size(enum AVPixelFormat pix_fmt, + int width, int height, int align) +{ + uint8_t *data[4]; + int linesize[4]; + int ret; + const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt); + if (!desc) + return AVERROR(EINVAL); + + ret = av_image_check_size(width, height, 0, NULL); + if (ret < 0) + return ret; + + // do not include palette for these pseudo-paletted formats + if (desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL) + return FFALIGN(width, align) * height; + + return av_image_fill_arrays(data, linesize, NULL, pix_fmt, + width, height, align); +} + +int av_image_copy_to_buffer(uint8_t *dst, int dst_size, + const uint8_t * const src_data[4], + const int src_linesize[4], + enum AVPixelFormat pix_fmt, + int width, int height, int align) +{ + int i, j, nb_planes = 0, linesize[4]; + int size = av_image_get_buffer_size(pix_fmt, width, height, align); + const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt); + int ret; + + if (size > dst_size || size < 0 || !desc) + return AVERROR(EINVAL); + + for (i = 0; i < desc->nb_components; i++) + nb_planes = FFMAX(desc->comp[i].plane, nb_planes); + + nb_planes++; + + ret = av_image_fill_linesizes(linesize, pix_fmt, width); + av_assert0(ret >= 0); // was checked previously + + for (i = 0; i < nb_planes; i++) { + int h, shift = (i == 1 || i == 2) ? desc->log2_chroma_h : 0; + const uint8_t *src = src_data[i]; + h = (height + (1 << shift) - 1) >> shift; + + for (j = 0; j < h; j++) { + memcpy(dst, src, linesize[i]); + dst += FFALIGN(linesize[i], align); + src += src_linesize[i]; + } + } + + if (desc->flags & AV_PIX_FMT_FLAG_PAL) { + uint32_t *d32 = (uint32_t *)dst; + + for (i = 0; i<256; i++) + AV_WL32(d32 + i, AV_RN32(src_data[1] + 4*i)); + } + + return size; +} |