Merge libavcore into libavutil

Done to keep ABI compatible. Otherwise this is just silly

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