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 (desc->flags & PIX_FMT_HWACCEL) return AVERROR(EINVAL); data[0] = ptr; 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; size[i] = h * linesizes[i]; total_size += size[i]; } return total_size; }