Merge libavcore into libavutil

It is pretty hopeless that other considerable projects will adopt
libavutil alone in other projects. Projects that need small footprint
are better off with more specialized libraries such as gnulib or rather
just copy the necessary parts that they need. With this in mind, nobody
is helped by having libavutil and libavcore split. In order to ease
maintenance inside and around FFmpeg and to reduce confusion where to
put common code, avcore's functionality is merged (back) to avutil.

Signed-off-by: Reinhard Tartler <siretart@tauware.de>

1 files changed, 297 insertions, 0 deletions

diff --git a/libavutil/imgutils.c b/libavutil/imgutils.c
new file mode 100644
index 0000000000..0f449ff427
--- /dev/null
+++ b/libavutil/imgutils.c
@@ -0,0 +1,297 @@
+/*
+ * 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 "imgutils.h"
+#include "internal.h"
+#include "libavutil/pixdesc.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_minus1+1) > max_pixsteps[comp->plane]) {
+            max_pixsteps[comp->plane] = comp->step_minus1+1;
+            if (max_pixstep_comps)
+                max_pixstep_comps[comp->plane] = i;
+        }
+    }
+}
+
+int av_image_get_linesize(enum PixelFormat pix_fmt, int width, int plane)
+{
+    const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[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 */
+    int s;
+
+    if (desc->flags & PIX_FMT_BITSTREAM)
+        return (width * (desc->comp[0].step_minus1+1) + 7) >> 3;
+
+    av_image_fill_max_pixsteps(max_step, max_step_comp, desc);
+    s = (max_step_comp[plane] == 1 || max_step_comp[plane] == 2) ? desc->log2_chroma_w : 0;
+    return max_step[plane] * (((width + (1 << s) - 1)) >> s);
+}
+
+int av_image_fill_linesizes(int linesizes[4], enum PixelFormat pix_fmt, int width)
+{
+    int i;
+    const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[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 ((unsigned)pix_fmt >= PIX_FMT_NB || desc->flags & PIX_FMT_HWACCEL)
+        return AVERROR(EINVAL);
+
+    if (desc->flags & PIX_FMT_BITSTREAM) {
+        if (width > (INT_MAX -7) / (desc->comp[0].step_minus1+1))
+            return AVERROR(EINVAL);
+        linesizes[0] = (width * (desc->comp[0].step_minus1+1) + 7) >> 3;
+        return 0;
+    }
+
+    av_image_fill_max_pixsteps(max_step, max_step_comp, desc);
+    for (i = 0; i < 4; i++) {
+        int s = (max_step_comp[i] == 1 || max_step_comp[i] == 2) ? desc->log2_chroma_w : 0;
+        int shifted_w = ((width + (1 << s) - 1)) >> s;
+        if (max_step[i] > INT_MAX / shifted_w)
+            return AVERROR(EINVAL);
+        linesizes[i] = max_step[i] * shifted_w;
+    }
+
+    return 0;
+}
+
+int av_image_fill_pointers(uint8_t *data[4], enum PixelFormat pix_fmt, int height,
+                           uint8_t *ptr, const int linesizes[4])
+{
+    int i, total_size, size[4], has_plane[4];
+
+    const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt];
+    memset(data     , 0, sizeof(data[0])*4);
+    memset(size     , 0, sizeof(size));
+    memset(has_plane, 0, sizeof(has_plane));
+
+    if ((unsigned)pix_fmt >= PIX_FMT_NB || desc->flags & PIX_FMT_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 & PIX_FMT_PAL) {
+        size[0] = (size[0] + 3) & ~3;
+        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; has_plane[i] && i < 4; 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 ff_set_systematic_pal2(uint32_t pal[256], enum PixelFormat pix_fmt)
+{
+    int i;
+
+    for (i = 0; i < 256; i++) {
+        int r, g, b;
+
+        switch (pix_fmt) {
+        case PIX_FMT_RGB8:
+            r = (i>>5    )*36;
+            g = ((i>>2)&7)*36;
+            b = (i&3     )*85;
+            break;
+        case PIX_FMT_BGR8:
+            b = (i>>6    )*85;
+            g = ((i>>3)&7)*36;
+            r = (i&7     )*36;
+            break;
+        case PIX_FMT_RGB4_BYTE:
+            r = (i>>3    )*255;
+            g = ((i>>1)&3)*85;
+            b = (i&1     )*255;
+            break;
+        case PIX_FMT_BGR4_BYTE:
+            b = (i>>3    )*255;
+            g = ((i>>1)&3)*85;
+            r = (i&1     )*255;
+            break;
+        case PIX_FMT_GRAY8:
+            r = b = g = i;
+            break;
+        default:
+            return AVERROR(EINVAL);
+        }
+        pal[i] = b + (g<<8) + (r<<16);
+    }
+
+    return 0;
+}
+
+int av_image_alloc(uint8_t *pointers[4], int linesizes[4],
+                   int w, int h, enum PixelFormat pix_fmt, int align)
+{
+    int i, ret;
+    uint8_t *buf;
+
+    if ((ret = av_image_check_size(w, h, 0, NULL)) < 0)
+        return ret;
+    if ((ret = av_image_fill_linesizes(linesizes, pix_fmt, 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 (av_pix_fmt_descriptors[pix_fmt].flags & PIX_FMT_PAL)
+        ff_set_systematic_pal2((uint32_t*)pointers[1], pix_fmt);
+
+    return ret;
+}
+
+typedef struct ImgUtils {
+    const AVClass *class;
+    int   log_offset;
+    void *log_ctx;
+} ImgUtils;
+
+static const AVClass imgutils_class = { "IMGUTILS", av_default_item_name, NULL, LIBAVUTIL_VERSION_INT, offsetof(ImgUtils, log_offset), offsetof(ImgUtils, log_ctx) };
+
+int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
+{
+    ImgUtils imgutils = { &imgutils_class, log_offset, 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);
+}
+
+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;
+    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 PixelFormat pix_fmt, int width, int height)
+{
+    const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt];
+
+    if (desc->flags & PIX_FMT_HWACCEL)
+        return;
+
+    if (desc->flags & PIX_FMT_PAL) {
+        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 (i == 1 || i == 2) {
+                h= -((-height)>>desc->log2_chroma_h);
+            }
+            av_image_copy_plane(dst_data[i], dst_linesizes[i],
+                                src_data[i], src_linesizes[i],
+                                bwidth, h);
+        }
+    }
+}
+
+#if FF_API_OLD_IMAGE_NAMES
+void av_fill_image_max_pixsteps(int max_pixsteps[4], int max_pixstep_comps[4],
+                                const AVPixFmtDescriptor *pixdesc)
+{
+    av_image_fill_max_pixsteps(max_pixsteps, max_pixstep_comps, pixdesc);
+}
+
+int av_get_image_linesize(enum PixelFormat pix_fmt, int width, int plane)
+{
+    return av_image_get_linesize(pix_fmt, width, plane);
+}
+
+int av_fill_image_linesizes(int linesizes[4], enum PixelFormat pix_fmt, int width)
+{
+    return av_image_fill_linesizes(linesizes, pix_fmt, width);
+}
+
+int av_fill_image_pointers(uint8_t *data[4], enum PixelFormat pix_fmt, int height,
+                           uint8_t *ptr, const int linesizes[4])
+{
+    return av_image_fill_pointers(data, pix_fmt, height, ptr, linesizes);
+}
+
+int av_check_image_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
+{
+    return av_image_check_size(w, h, log_offset, log_ctx);
+}
+#endif